flagon-io/g1t

public

Where people and agents ship software together. The open-source git platform for the whole job: issues, agents, checks and deploys to the edge.

g1t.sh

git agents cloudflare rust forge mcp

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1	//! The repos service: repository metadata, contents, forks, landing, and
2	//! git over HTTPS.
3	//!
4	//! Other services reach it over `POST /rpc/<method>`; see
5	//! `g1t_contracts::repos` for the methods and their arguments. Any other
6	//! request is treated as git's smart HTTP protocol.
7
8	mod about;
9	mod archive_links;
10	mod backups;
11	mod blame;
12	mod catch_up;
13	mod coalesce;
14	mod commit_file;
15	mod contributors;
16	mod copy;
17	mod diff;
18	mod drift;
19	mod fallback;
20	mod forks;
21	mod git_http;
22	mod git_ops;
23	mod hidden_refs;
24	mod import;
25	mod land;
26	mod languages;
27	mod last_commits;
28	mod license;
29	mod lifecycle;
30	mod limits;
31	mod listing;
32	mod meters;
33	mod moves;
34	mod namespaces;
35	mod pack_cache;
36	mod pack_limits;
37	mod push_checks;
38	mod push_commits;
39	mod refs;
40	mod refs_cache;
41	mod registry;
42	mod resilience;
43	mod rule_facts;
44	mod rules;
45	mod run_access;
46	mod secret_scan;
47	mod shards;
48	mod shared;
49	mod signatures;
50	mod stats;
51	mod store;
52	mod test_merge;
53	mod transfer;
54	mod workflow_gate;
55
56	use g1t_contracts::events::{
57	Event, GitDeleted, GitPush, NewEvent, Publish, RepoCreated, RepoForked, RepoUpdated, WorkspaceDeleted,
58	WorkspaceDeleting, WorkspaceRenamed, WorkspaceRestored,
59	};
60	use g1t_contracts::access::{self, Capability};
61	use g1t_contracts::repos::*;
62	use g1t_contracts::time::rfc3339;
63	use g1t_contracts::{FailureCode, Outcome, PrincipalKind, Role, User, Viewer, is_valid_repo_name, new_id};
64	use g1t_kit::{args, now_ms, reply, rpc_method};
65	use std::collections::{HashMap, HashSet, VecDeque};
66	use std::rc::Rc;
67
68	use serde::Serialize;
69	use worker::{
70	Context, Env, Fetcher, MessageBatch, MessageExt, Method, Request, Response, Result, ScheduleContext, ScheduledEvent,
71	event,
72	};
73
74	use registry::{Registry, can_read, can_write, store_key};
75	use store::{ArtifactsStore, GitRepo, GitStore, Scope};
76
77	/// Namespace that holds every pull request's fork: `pulls/<pull id>`.
78	pub(crate) const PULLS_NAMESPACE: &str = "pulls";
79	const MAX_TEXT_BYTES: usize = 512 * 1024;
80	/// How far back a pull request may have forked and still be landed.
81	const MAX_ANCESTRY: u32 = 1000;
82	/// The most files one `compare` asked for by path reads.
83	const MAX_COMPARED_PATHS: usize = 50;
84	/// The most tags a repository's Tags page reads and lists.
85	const MAX_TAGS_READ: usize = 100;
86	/// Branch heads measured in one `branch_drift` call.
87	const MAX_DRIFT_HEADS: usize = 100;
88	/// How long a `last_commits` walk asked without a budget runs before it
89	/// stops and keeps its progress for the next call. The site asks from a
90	/// waitUntil, which may run 30 s past its response.
91	const LAST_COMMITS_WALK_MS: u64 = 20_000;
92	/// How long a path's history may walk when the caller gives no budget.
93	const PATH_LOG_WALK_MS: u64 = 10_000;
94
95	/// One path segment, percent-encoded for a cache key.
96	fn urlencoding_segment(segment: &str) -> String {
97	segment
98	.bytes()
99	.map(\|b\| if b.is_ascii_alphanumeric() \|\| b"-._~".contains(&b) { (b as char).to_string() } else { format!("%{b:02X}") })
100	.collect()
101	}
102	const MAX_DESCRIPTION_CHARS: usize = 200;
103	pub(crate) const SOURCE: &str = "repos";
104	pub(crate) const UNVERIFIED: &str = "Confirm your email address first. Check your inbox, or resend the link from the banner on g1t.sh.";
105
106	pub(crate) fn not_found<T>() -> Outcome<T> {
107	Outcome::fail(FailureCode::NotFound, "Repository not found.")
108	}
109
110	/// Decoded text, or `None` when the file is too large or looks binary.
111	/// Whether a ref is a full commit hash rather than a branch name.
112	fn is_commit_hash(git_ref: &str) -> bool {
113	git_ref.len() == 40 && git_ref.bytes().all(\|b\| b.is_ascii_hexdigit())
114	}
115
116	fn text_of(bytes: Vec<u8>) -> Option<String> {
117	if bytes.len() > MAX_TEXT_BYTES \|\| bytes.contains(&0) {
118	return None;
119	}
120	Some(String::from_utf8_lossy(&bytes).into_owned())
121	}
122
123	fn is_readme(name: &str) -> bool {
124	matches!(
125	name.to_lowercase().as_str(),
126	"readme" \| "readme.md" \| "readme.markdown" \| "readme.txt"
127	)
128	}
129
130	/// Whether `ancestor` is reachable from the newest commit in `history`.
131	///
132	/// `history` is the first-parent chain, which is all the store lists; a fork
133	/// that merged the target branch in has the target's head on a second
134	/// parent, so the walk follows every parent.
135	async fn descends_from<R: GitRepo>(repo: &R, history: &[Commit], ancestor: &str) -> Result<bool> {
136	let known: HashMap<&str, &[String]> = history
137	.iter()
138	.map(\|commit\| (commit.hash.as_str(), commit.parents.as_slice()))
139	.collect();
140	let mut seen = HashSet::new();
141	let mut queue: Vec<String> = history
142	.first()
143	.map(\|c\| c.hash.clone())
144	.into_iter()
145	.collect();
146	while let Some(hash) = queue.pop() {
147	if hash == ancestor {
148	return Ok(true);
149	}
150	if !seen.insert(hash.clone()) \|\| seen.len() > MAX_ANCESTRY as usize {
151	continue;
152	}
153	match known.get(hash.as_str()) {
154	Some(parents) => queue.extend(parents.iter().cloned()),
155	None => queue.extend(repo.parents(&hash).await?.unwrap_or_default()),
156	}
157	}
158	Ok(false)
159	}
160
161	/// The commit closest to the newest in `history` that is also in `shared`:
162	/// where a fork and the repository it came from last agreed.
163	async fn nearest_ancestor_in<R: GitRepo>(
164	repo: &R,
165	history: &[Commit],
166	shared: &HashSet<String>,
167	) -> Result<Option<String>> {
168	let known: HashMap<&str, &[String]> = history
169	.iter()
170	.map(\|commit\| (commit.hash.as_str(), commit.parents.as_slice()))
171	.collect();
172	let mut seen = HashSet::new();
173	let mut queue: VecDeque<String> = history
174	.first()
175	.map(\|c\| c.hash.clone())
176	.into_iter()
177	.collect();
178	while let Some(hash) = queue.pop_front() {
179	if shared.contains(&hash) {
180	return Ok(Some(hash));
181	}
182	if !seen.insert(hash.clone()) \|\| seen.len() > MAX_ANCESTRY as usize {
183	continue;
184	}
185	match known.get(hash.as_str()) {
186	Some(parents) => queue.extend(parents.iter().cloned()),
187	None => queue.extend(repo.parents(&hash).await?.unwrap_or_default()),
188	}
189	}
190	Ok(None)
191	}
192
193	thread_local! {
194	/// Targets' sides of mergeability, by head (coalesce.rs).
195	static TARGETS: std::cell::RefCell<coalesce::Memo<coalesce::TargetKey, Rc<coalesce::TargetSide>>> =
196	std::cell::RefCell::new(coalesce::Memo::new(coalesce::TARGET_TTL_MS, 32));
197	/// What targets changed between two trees.
198	static THEIRS: std::cell::RefCell<coalesce::Memo<coalesce::TheirsKey, (Vec<String>, bool)>> =
199	std::cell::RefCell::new(coalesce::Memo::new(coalesce::THEIRS_TTL_MS, 256));
200	/// What repositories hold, as read for a push's first request, for the
201	/// same push's second: a push's POST does not wait on the database.
202	static HELD: std::cell::RefCell<coalesce::Memo<String, u64>> =
203	std::cell::RefCell::new(coalesce::Memo::new(60_000, 512));
204	}
205
206	pub(crate) struct Repos<S: GitStore> {
207	registry: Registry,
208	store: S,
209	events: Fetcher,
210	/// Asked during a push which secrets have been allowed.
211	security: Option<Fetcher>,
212	/// Asked whether a workspace is on a plan, for its private storage.
213	billing: Option<Fetcher>,
214	/// Says which rulesets hold for a change to a branch or tag, and keeps
215	/// how they judged it (rules.rs). `None` where it is not deployed: the
216	/// old protection flag then holds on push.
217	work: Option<Fetcher>,
218	/// Told when a repository moves, for the tokens of agents at work on it.
219	identity: Option<Fetcher>,
220	/// What a free workspace's private repositories may hold.
221	free_private_bytes: i64,
222	/// Days a pull request's working copy is kept after it settles (forks.rs).
223	pub(crate) fork_days: u64,
224	/// The most a repository may hold (pack_limits.rs), and what happens
225	/// to a push too large to scan.
226	repo_limit: u64,
227	large_pushes: git_http::LargePushes,
228	/// Which git store namespace new repositories go in (shards.rs), and
229	/// the most each should hold (`GITSTORE_NAMESPACE_LIMITS`).
230	placement: shards::Placement,
231	limits: HashMap<String, u64>,
232	/// What isolates share: answers that list refs (refs_cache.rs).
233	shared: Option<Rc<shared::Shared>>,
234	/// Packs for fresh clones (pack_cache.rs); `None` without the bucket.
235	packs: Option<Rc<pack_cache::Packs>>,
236	/// What this request started that need not hold up its answer
237	/// (store.rs), handed to its `waitUntil` once it has answered.
238	deferred: Rc<store::Deferred>,
239	}
240
241	impl<S: GitStore> Repos<S> {
242	/// Records that the refs of the repository with this id changed, once
243	/// they have, so that the answers kept that list them go stale (see
244	/// refs_cache.rs). Everything that changes a repository's refs calls
245	/// this after it (`every_ref_writer_records_the_change` checks). A
246	/// failure is logged: the change itself happened, and what was kept
247	/// expires within `refs_cache::TTL_SECONDS` regardless.
248	pub(crate) async fn refs_moved(&self, repo_id: &str) {
249	if let Err(error) = self.registry.refs_moved(repo_id).await {
250	worker::console_error!("refs of {repo_id} changed but not recorded: {error}");
251	}
252	}
253
254	pub(crate) async fn publish<T: Serialize>(&self, event: NewEvent<T>) -> Result<()> {
255	g1t_kit::call(
256	&self.events,
257	"publish",
258	&Publish {
259	events: vec![event],
260	},
261	)
262	.await
263	}
264
265	/// Whether the viewer may read `repo`. A pull request's fork of a
266	/// private repository can be read by everyone who can read that
267	/// repository, so its members can review and check out the change, as
268	/// well as by whoever opened the pull request.
269	async fn may_read(&self, repo: &Repo, viewer: &Viewer) -> Result<bool> {
270	if can_read(repo, viewer) {
271	return Ok(true);
272	}
273	let Some(source_id) = &repo.fork_of else {
274	return Ok(false);
275	};
276	Ok(self
277	.registry
278	.by_id(source_id)
279	.await?
280	.is_some_and(\|source\| can_read(&source, viewer)))
281	}
282
283	/// `repo`, if there is one and the viewer may read it.
284	async fn visible(&self, repo: Option<Repo>, viewer: &Viewer) -> Result<Option<Repo>> {
285	Ok(match repo {
286	Some(repo) if self.may_read(&repo, viewer).await? => Some(repo),
287	_ => None,
288	})
289	}
290
291	/// Resolves a repo the viewer may read; private repos look missing.
292	pub(crate) async fn readable(&self, path: &RepoPath, viewer: &Viewer) -> Result<Option<Repo>> {
293	self.visible(self.registry.by_path(path).await?, viewer)
294	.await
295	}
296
297	async fn get(&self, a: GetArgs) -> Result<Outcome<Repo>> {
298	Ok(self
299	.readable(&a.path, &a.viewer)
300	.await?
301	.map_or_else(not_found, Outcome::Ok))
302	}
303
304	async fn get_by_id(&self, a: GetByIdArgs) -> Result<Outcome<Repo>> {
305	Ok(self
306	.visible(self.registry.by_id(&a.id).await?, &a.viewer)
307	.await?
308	.map_or_else(not_found, Outcome::Ok))
309	}
310
311	async fn update(&self, a: UpdateArgs) -> Result<Outcome<Repo>> {
312	let viewer = Some(a.actor.clone());
313	let Some(repo) = self.readable(&a.path, &viewer).await? else {
314	return Ok(not_found());
315	};
316	// Its details take Maintain; its protection, Admin; who can see it,
317	// Admin and the member privileges (below). See g1t_contracts::access.
318	let protection_changes = a.protected.is_some_and(\|protected\| protected != repo.protected);
319	let details_change = a.description.is_some() \|\| a.website.is_some() \|\| a.topics.is_some();
320	let mut needed = Vec::new();
321	if details_change \|\| !protection_changes {
322	needed.push(Capability::ManageSettings);
323	}
324	if protection_changes {
325	needed.push(Capability::ManageProtection);
326	}
327	let full_name = format!("{}/{}", repo.namespace, repo.name);
328	if repo.fork_of.is_some() {
329	return Ok(Outcome::fail(FailureCode::Forbidden, access::needs(Capability::ManageSettings, &full_name)));
330	}
331	if let Some(missing) = needed.into_iter().find(\|capability\| !registry::can(&repo, &viewer, *capability)) {
332	return Ok(Outcome::fail(FailureCode::Forbidden, access::needs(missing, &full_name)));
333	}
334	if !a.actor.verified {
335	return Ok(Outcome::fail(FailureCode::Forbidden, UNVERIFIED));
336	}
337	if let Some((code, message)) = lifecycle::archived_refusal(&repo) {
338	return Ok(Outcome::fail(code, message));
339	}
340	let description = match a.description {
341	Some(text) => Some(
342	text.trim()
343	.chars()
344	.take(MAX_DESCRIPTION_CHARS)
345	.collect::<String>(),
346	)
347	.filter(\|text\| !text.is_empty()),
348	None => repo.description.clone(),
349	};
350	let website = match a.website.as_deref() {
351	Some(text) => match clean_website(text) {
352	Ok(website) => website,
353	Err(reason) => return Ok(Outcome::fail(FailureCode::Invalid, reason)),
354	},
355	None => repo.website.clone(),
356	};
357	// Who can see it is an owner's to change, and a free workspace's
358	// storage may not take it private: see lifecycle.rs.
359	let wants_private = a.is_private.filter(\|private\| *private != repo.is_private);
360	if wants_private.is_some()
361	&& let Err((code, message)) = lifecycle::admin_only(
362	lifecycle::Asker::on(&a.actor, &repo),
363	&repo.namespace,
364	"change the visibility of",
365	Capability::ChangeVisibility,
366	)
367	{
368	return Ok(Outcome::fail(code, message));
369	}
370	if let Some(private) = wants_private
371	&& let Some(why) = lifecycle::visibility_refusal(&a.actor, &repo, private)
372	{
373	return Ok(Outcome::fail(FailureCode::Forbidden, why));
374	}
375	let is_private = repo.is_private;
376	let protected = a.protected.unwrap_or(repo.protected);
377	let topics = match &a.topics {
378	Some(topics) => match clean_topics(topics) {
379	Ok(topics) => topics,
380	Err(reason) => return Ok(Outcome::fail(FailureCode::Invalid, reason)),
381	},
382	None => repo.topics.clone(),
383	};
384	self.registry
385	.update(&repo.id, description.as_deref(), protected, &topics, website.as_deref())
386	.await?;
387	let updated = Repo {
388	description,
389	is_private,
390	protected,
391	topics,
392	website,
393	..repo
394	};
395	// Whether the default branch takes only pull requests is now its
396	// branch protection ruleset's to say (work's rulesets.rs).
397	if let (Some(protected), Some(work)) = (a.protected, &self.work) {
398	#[derive(Serialize)]
399	struct RequirePullRequest<'a> {
400	repo: &'a Repo,
401	protected: bool,
402	actor: &'a User,
403	}
404	let set: Result<Outcome<bool>> =
405	g1t_kit::call(work, "set_requires_pull_request", &RequirePullRequest { repo: &updated, protected, actor: &a.actor }).await;
406	match set {
407	Ok(Outcome::Ok(_)) => {}
408	Ok(Outcome::Fail(failure)) => return Ok(Outcome::Fail(failure)),
409	Err(error) => return Err(error),
410	}
411	}
412	if let Some(private) = wants_private {
413	return self.change_visibility(updated, private, &a.actor, a.surface).await;
414	}
415	let visibility_changed = false;
416	// Search and anything else that shows the repository hears of it;
417	// a change of visibility is announced on its own as well, so that
418	// what was public stops being shown at once.
419	self.publish(NewEvent {
420	kind: "repo.updated",
421	source: SOURCE,
422	repo_id: Some(updated.id.clone()),
423	actor: Some(a.actor.id.clone()),
424	data: RepoUpdated {
425	repo_id: updated.id.clone(),
426	namespace: updated.namespace.clone(),
427	name: updated.name.clone(),
428	is_private,
429	visibility_changed,
430	},
431	})
432	.await?;
433	Ok(Outcome::Ok(updated))
434	}
435
436	/// The repository with this id, if it is not a fork, and its store.
437	async fn stored(&self, repo_id: &str) -> Result<Option<S::Repo>> {
438	match self.registry.by_id(repo_id).await? {
439	Some(repo) if repo.fork_of.is_none() => Ok(Some(self.store.open(&store_key(&repo)).await?)),
440	_ => Ok(None),
441	}
442	}
443
444	async fn list_files(&self, a: ListFilesArgs) -> Result<FileList> {
445	let Some(repo) = self.registry.by_id(&a.repo_id).await?.filter(\|repo\| repo.fork_of.is_none()) else {
446	return Ok(FileList::default());
447	};
448	let git = self.store.open(&store_key(&repo)).await?;
449	let head = a.git_ref.unwrap_or_else(\|\| repo.default_branch.clone());
450	listing::list(&git, None, &head, &a.skip_dirs, a.limit, a.links).await
451	}
452
453	/// A link to download a branch, tag or commit as an archive, good for
454	/// a few minutes with no session or token (archive_links.rs).
455	async fn archive_link(&self, a: ArchiveLinkArgs, sealer: Option<&g1t_secrets::Sealer>) -> Result<Outcome<ArchiveLink>> {
456	let Some(repo) = self.readable(&a.path, &a.viewer).await? else {
457	return Ok(not_found());
458	};
459	let Some(sealer) = sealer else {
460	return Ok(Outcome::fail(FailureCode::Invalid, "Archive downloads are not set up on this installation."));
461	};
462	let git = self.read_git(&repo).await?;
463	let git_ref = a.git_ref.filter(\|git_ref\| !git_ref.is_empty()).unwrap_or_else(\|\| repo.default_branch.clone());
464	let Some(head) = git.log(&git_ref, 1).await?.into_iter().next() else {
465	return Ok(Outcome::fail(FailureCode::NotFound, "No such branch, tag or commit."));
466	};
467	let (token, expires) = archive_links::seal(sealer, &repo.id, &head.hash, now_ms());
468	Ok(Outcome::Ok(ArchiveLink { repo, commit: head.hash, token, expires_at: rfc3339(expires) }))
469	}
470
471	/// What an archive link's token lets its holder download.
472	async fn open_archive_token(&self, a: OpenArchiveTokenArgs, sealer: Option<&g1t_secrets::Sealer>) -> Result<Option<ArchiveGrant>> {
473	let Some(sealer) = sealer else {
474	return Ok(None);
475	};
476	let Some(repo) = self.registry.by_path(&a.path).await? else {
477	return Ok(None);
478	};
479	let Some(commit) = archive_links::open(sealer, &repo.id, &a.token, now_ms()) else {
480	return Ok(None);
481	};
482	Ok(Some(ArchiveGrant { repo_id: repo.id, namespace: repo.namespace, name: repo.name, commit }))
483	}
484
485	async fn changed_files(&self, a: ChangedFilesArgs) -> Result<FileList> {
486	let Some(git) = self.stored(&a.repo_id).await? else {
487	return Ok(FileList::default());
488	};
489	listing::list(&git, a.base.as_deref(), &a.head, &a.skip_dirs, a.limit, false).await
490	}
491
492	/// Branches and tags with their commits, for g1t's own services.
493	async fn refs_of(&self, a: RefsArgs) -> Result<Option<RepoRefs>> {
494	let Some(repo) = self.registry.by_id(&a.repo_id).await?.filter(\|repo\| repo.fork_of.is_none()) else {
495	return Ok(None);
496	};
497	let git = self.store.open(&store_key(&repo)).await?;
498	let access = git.access(Scope::Read).await?;
499	let refs = refs::heads_and_tags(refs::all(&access).await?)
500	.into_iter()
501	.map(\|(name, commit)\| GitRefEntry { name, commit })
502	.collect();
503	Ok(Some(RepoRefs { repo, refs }))
504	}
505
506	async fn raw_file(&self, a: RawFileArgs) -> Result<Option<RawFile>> {
507	use base64::Engine;
508	let Some(git) = self.stored(&a.repo_id).await? else {
509	return Ok(None);
510	};
511	Ok(git
512	.read_file(&a.git_ref, &a.path)
513	.await?
514	.filter(\|bytes\| bytes.len() <= a.max_bytes as usize)
515	.map(\|bytes\| RawFile { size: bytes.len() as u64, data: base64::engine::general_purpose::STANDARD.encode(bytes) }))
516	}
517
518	async fn raw_blobs(&self, a: RawBlobsArgs) -> Result<Vec<RawBlob>> {
519	use base64::Engine;
520	let Some(git) = self.stored(&a.repo_id).await? else {
521	return Ok(Vec::new());
522	};
523	let hashes: Vec<&String> = a.hashes.iter().take(MAX_READ_BLOBS).collect();
524	let mut out = Vec::with_capacity(hashes.len());
525	// A few at a time, as listing::read does: each is a round trip.
526	for group in hashes.chunks(8) {
527	let read = futures_util::future::try_join_all(group.iter().map(\|hash\| git.read_blob(hash))).await?;
528	for (hash, bytes) in group.iter().zip(read) {
529	let size = bytes.as_ref().map_or(0, \|bytes\| bytes.len() as u64);
530	let data = bytes
531	.filter(\|bytes\| bytes.len() <= a.max_bytes as usize)
532	.map(\|bytes\| base64::engine::general_purpose::STANDARD.encode(bytes));
533	out.push(RawBlob { hash: (*hash).clone(), size, data });
534	}
535	}
536	Ok(out)
537	}
538
539	async fn read_blobs(&self, a: ReadBlobsArgs) -> Result<Vec<BlobText>> {
540	let Some(git) = self.stored(&a.repo_id).await? else {
541	return Ok(Vec::new());
542	};
543	listing::read(&git, &a.hashes, a.max_bytes.min(MAX_TEXT_BYTES as u32)).await
544	}
545
546	async fn create(&self, a: CreateArgs) -> Result<Outcome<Repo>> {
547	if !a.owner.verified {
548	return Ok(Outcome::fail(FailureCode::Forbidden, UNVERIFIED));
549	}
550	let name = a.name.trim().to_lowercase();
551	if !is_valid_repo_name(&name) {
552	return Ok(Outcome::fail(
553	FailureCode::Invalid,
554	"Use letters, digits, dots, hyphens and underscores only.",
555	));
556	}
557	let namespace = a.namespace.trim().to_lowercase();
558	if namespace.is_empty() {
559	return Ok(Outcome::fail(
560	FailureCode::Invalid,
561	"Say which workspace to create the repository in.",
562	));
563	}
564	let Some(role) = a.owner.role_in(&namespace) else {
565	return Ok(Outcome::fail(
566	FailureCode::Forbidden,
567	"You are not a member of that workspace.",
568	));
569	};
570	// Who may create which: the workspace's member privileges. A
571	// workspace's own token acts as an owner would.
572	let role = if a.owner.kind == PrincipalKind::Workspace { Role::Owner } else { role };
573	if let Some(why) = a.owner.privileges_in(&namespace).creation_refusal(role, a.is_private, &namespace) {
574	return Ok(Outcome::fail(FailureCode::Forbidden, why));
575	}
576	let path = RepoPath { namespace, name };
577	match self.registry.by_path_any(&path).await? {
578	Some((_, None)) => {
579	return Ok(Outcome::fail(
580	FailureCode::Conflict,
581	"That workspace already has a repository with that name.",
582	));
583	}
584	Some((_, Some(_))) => {
585	return Ok(Outcome::fail(
586	FailureCode::Conflict,
587	format!(
588	"{}/{} was deleted recently and can still be restored, so its name is taken. Restore it, or delete it permanently from the workspace's Recently deleted list.",
589	path.namespace, path.name
590	),
591	));
592	}
593	None => {}
594	}
595	// With a credential (a GitHub App installation's token), everything
596	// is copied: every branch and tag. See copy.rs.
597	let mut credentialed = None;
598	if let (Some(url), Some(token)) = (a.import_url.as_deref(), a.import_token.as_deref()) {
599	let Some(url) = import::clean_url(url) else {
600	return Ok(Outcome::fail(FailureCode::Invalid, "That is not an https repository address."));
601	};
602	let source = copy::Endpoint::github(&url, token);
603	match copy::probe(&source).await? {
604	Ok(advertised) => credentialed = Some((source, advertised)),
605	Err(reason) => return Ok(Outcome::fail(FailureCode::Invalid, reason)),
606	}
607	}
608	// An import is fetched before anything is created, so that an
609	// address that does not work leaves nothing behind.
610	let mut imported = None;
611	if let Some(url) = a
612	.import_url
613	.as_deref()
614	.map(str::trim)
615	.filter(\|url\| !url.is_empty() && credentialed.is_none())
616	{
617	let Some(url) = import::clean_url(url) else {
618	return Ok(Outcome::fail(
619	FailureCode::Invalid,
620	"Give the https address of a public repository, such as https://github.com/owner/repo.",
621	));
622	};
623	let remote = match import::discover(&url).await? {
624	Ok(remote) => remote,
625	Err(reason) => return Ok(Outcome::fail(FailureCode::Invalid, reason)),
626	};
627	imported = Some((remote, url));
628	}
629	let now = now_ms();
630	let repo = Repo {
631	id: new_id("rep", now),
632	namespace: path.namespace,
633	name: path.name,
634	description: a
635	.description
636	.map(\|text\| text.trim().to_owned())
637	.filter(\|text\| !text.is_empty()),
638	is_private: a.is_private,
639	owner_id: a.owner.id.clone(),
640	default_branch: imported
641	.as_ref()
642	.map(\|(remote, _)\| remote.branch.clone())
643	.or_else(\|\| credentialed.as_ref().and_then(\|(_, advertised)\| advertised.default_branch()))
644	.unwrap_or_else(\|\| "main".to_owned()),
645	fork_of: None,
646	protected: false,
647	created_at: rfc3339(now),
648	topics: Vec::new(),
649	website: None,
650	archived_at: None,
651	};
652	let namespace = match self.place(&repo).await? {
653	Ok(namespace) => namespace,
654	Err(unplaced) => return Ok(Outcome::fail(FailureCode::Conflict, unplaced.message())),
655	};
656	self.registry
657	.claim_store_key(&repo, namespace.as_deref(), &self.store.default_namespace())
658	.await?;
659	self.store
660	.create(
661	&store_key(&repo),
662	repo.description.as_deref(),
663	&repo.default_branch,
664	)
665	.await?;
666	self.registry.insert(&repo).await?;
667	// A repository that was transferred away from this path stops
668	// redirecting here.
669	self.registry
670	.drop_redirect(&RepoPath {
671	namespace: repo.namespace.clone(),
672	name: repo.name.clone(),
673	})
674	.await?;
675	// Every branch and tag the import made, announced as pushes.
676	let mut pushed: Vec<(String, String)> = Vec::new();
677	// A public repository, read with no credential: every branch and
678	// tag is copied too, the default branch the one its HEAD names.
679	if let Some((_, url)) = imported {
680	let access = self
681	.store
682	.open(&store_key(&repo))
683	.await?
684	.access(Scope::Write)
685	.await?;
686	let target = copy::Endpoint::bearer(&access.remote, &access.token);
687	let copied = copy::copy(&copy::Endpoint::anonymous(&url), &target).await?;
688	self.refs_moved(&repo.id).await;
689	match copied {
690	Ok(copied) => pushed = copy::import_pushes(&copied.updated, &repo.default_branch),
691	Err(reason) => {
692	self.registry.remove(&repo.id).await?;
693	return Ok(Outcome::fail(
694	FailureCode::Invalid,
695	format!("The repository could not be stored: {reason}"),
696	));
697	}
698	}
699	}
700	if let Some((source, _)) = credentialed {
701	let access = self
702	.store
703	.open(&store_key(&repo))
704	.await?
705	.access(Scope::Write)
706	.await?;
707	let target = copy::Endpoint::bearer(&access.remote, &access.token);
708	let copied = copy::copy(&source, &target).await?;
709	self.refs_moved(&repo.id).await;
710	match copied {
711	Ok(copied) => pushed = copy::import_pushes(&copied.updated, &repo.default_branch),
712	Err(reason) => {
713	self.registry.remove(&repo.id).await?;
714	return Ok(Outcome::fail(
715	FailureCode::Invalid,
716	format!("The repository could not be copied: {reason}"),
717	));
718	}
719	}
720	}
721	// Whoever creates a repository is an Admin of it, as a role given
722	// to them on it, whatever the workspace's base permission.
723	if a.owner.kind == PrincipalKind::User
724	&& let Some(identity) = &self.identity
725	{
726	let granted: Result<bool> = g1t_kit::call(
727	identity,
728	"grant_creator",
729	&g1t_contracts::members::GrantCreatorArgs {
730	repo_id: repo.id.clone(),
731	namespace: repo.namespace.clone(),
732	name: repo.name.clone(),
733	user_id: a.owner.id.clone(),
734	},
735	)
736	.await;
737	if let Err(error) = granted {
738	worker::console_error!("creator of {} not given Admin: {error}", repo.id);
739	}
740	}
741	self.publish(NewEvent {
742	kind: "repo.created",
743	source: SOURCE,
744	repo_id: Some(repo.id.clone()),
745	actor: Some(a.owner.id),
746	data: RepoCreated {
747	repo_id: repo.id.clone(),
748	namespace: repo.namespace.clone(),
749	name: repo.name.clone(),
750	is_private: repo.is_private,
751	},
752	})
753	.await?;
754	for (git_ref, head) in &pushed {
755	self.publish_push(&repo, git_ref, None, head, None, None).await?;
756	}
757	Ok(Outcome::Ok(repo))
758	}
759
760	/// Where a workspace keeps its data, asked of identity only when an EU
761	/// namespace is configured: without one, every workspace's
762	/// repositories go anywhere and identity is never asked.
763	async fn residency_of(&self, workspace: &str) -> Result<shards::Residency> {
764	if self.placement.eu.is_none() {
765	return Ok(shards::Residency::Anywhere);
766	}
767	let Some(identity) = &self.identity else {
768	return Ok(shards::Residency::Anywhere);
769	};
770	let residency: Option<g1t_contracts::identity::DataResidency> = g1t_kit::call(
771	identity,
772	"workspace_residency",
773	&g1t_contracts::identity::SlugArgs { slug: workspace.to_owned() },
774	)
775	.await?;
776	Ok(match residency {
777	Some(g1t_contracts::identity::DataResidency::Eu) => shards::Residency::Eu,
778	_ => shards::Residency::Anywhere,
779	})
780	}
781
782	/// How each bound namespace stands (namespaces.rs).
783	async fn standings(&self) -> Result<Vec<namespaces::Standing>> {
784	let bound = self.store.namespaces();
785	let default = self.store.default_namespace();
786	let now = now_ms();
787	let config = namespaces::Configured {
788	bound: &bound,
789	default: &default,
790	placement: &self.placement,
791	limits: &self.limits,
792	on_fallback: &\|namespace\| self.store.on_fallback(&shards::compose(Some(namespace), "x", &default)),
793	writable: &\|namespace\| self.store.writable(namespace),
794	breaker_open: &\|namespace\| resilience::open_now(namespace, now),
795	};
796	let (held, recent) = futures_util::future::join(namespaces::held(&self.registry.db), namespaces::recent(&self.registry.db, now)).await;
797	Ok(namespaces::standings(&config, &held?, &recent?))
798	}
799
800	/// The namespace a new repository goes in (shards.rs): its workspace's
801	/// residency, then how each namespace stands, read only when there is
802	/// a choice to make. `Ok(None)` for the default.
803	async fn place(&self, repo: &Repo) -> Result<std::result::Result<Option<String>, shards::Unplaced>> {
804	let residency = self.residency_of(&repo.namespace).await?;
805	let bound = self.store.namespaces();
806	let loads = if residency == shards::Residency::Anywhere && !self.placement.needs_loads(&bound) {
807	// One namespace to choose from at most: nothing to read.
808	bound
809	.iter()
810	.map(\|namespace\| shards::Load {
811	namespace: namespace.clone(),
812	bound: true,
813	writable: self.store.writable(namespace),
814	..shards::Load::default()
815	})
816	.collect()
817	} else {
818	let default = self.store.default_namespace();
819	let now = now_ms();
820	let config = namespaces::Configured {
821	bound: &bound,
822	default: &default,
823	placement: &self.placement,
824	limits: &self.limits,
825	on_fallback: &\|namespace\| self.store.on_fallback(&shards::compose(Some(namespace), "x", &default)),
826	writable: &\|namespace\| self.store.writable(namespace),
827	breaker_open: &\|namespace\| resilience::open_now(namespace, now),
828	};
829	namespaces::loads(&self.registry.db, &config, now).await?
830	};
831	Ok(self.placement.choose(&repo.id, residency, &loads))
832	}
833
834	/// `storage_options`: what a workspace may choose about where its
835	/// repositories are kept.
836	fn storage_options(&self) -> StorageOptions {
837	let bound = self.store.namespaces();
838	StorageOptions { eu_available: self.placement.eu_available(&bound, \|namespace\| self.store.writable(namespace)) }
839	}
840
841	async fn tree(&self, a: TreeArgs) -> Result<Outcome<TreeView>> {
842	let Some(repo) = self.readable(&a.path, &a.viewer).await? else {
843	return Ok(not_found());
844	};
845	let git = self.read_git(&repo).await?;
846	let git_ref = a
847	.git_ref
848	.clone()
849	.unwrap_or_else(\|\| repo.default_branch.clone());
850
851	let Some(head) = git.log(&git_ref, 1).await?.into_iter().next() else {
852	// An unknown ref is an error; a repo with no commits is just empty.
853	if a.git_ref.is_some() {
854	return Ok(Outcome::fail(
855	FailureCode::NotFound,
856	"No such branch, tag or commit.",
857	));
858	}
859	return Ok(Outcome::Ok(TreeView {
860	repo,
861	git_ref,
862	path: a.tree_path,
863	head: None,
864	entries: Vec::new(),
865	readme: None,
866	}));
867	};
868
869	let no_directory = \|\| Outcome::fail(FailureCode::NotFound, "No such directory.");
870	let mut entries = git.read_tree(&head.tree_hash).await?;
871	for segment in a.tree_path.split('/').filter(\|segment\| !segment.is_empty()) {
872	let next = entries.as_ref().and_then(\|entries\| {
873	entries
874	.iter()
875	.find(\|entry\| entry.name == segment && entry.kind == EntryKind::Tree)
876	});
877	let Some(next) = next else {
878	return Ok(no_directory());
879	};
880	entries = git.read_tree(&next.hash).await?;
881	}
882	let Some(mut entries) = entries else {
883	return Ok(no_directory());
884	};
885	// Directories first, then by name.
886	entries.sort_by(\|a, b\| {
887	(b.kind == EntryKind::Tree)
888	.cmp(&(a.kind == EntryKind::Tree))
889	.then_with(\|\| a.name.cmp(&b.name))
890	});
891
892	let readme_entry = entries
893	.iter()
894	.find(\|entry\| entry.kind == EntryKind::Blob && is_readme(&entry.name));
895	let readme = match readme_entry {
896	Some(entry) => git.read_blob(&entry.hash).await?.map(\|bytes\| Readme {
897	name: entry.name.clone(),
898	text: text_of(bytes),
899	}),
900	None => None,
901	};
902	Ok(Outcome::Ok(TreeView {
903	repo,
904	git_ref,
905	path: a.tree_path,
906	head: Some(head),
907	entries,
908	readme,
909	}))
910	}
911
912	async fn blob(&self, a: BlobArgs) -> Result<Outcome<BlobView>> {
913	let Some(repo) = self.readable(&a.path, &a.viewer).await? else {
914	return Ok(not_found());
915	};
916	let bytes = if a.file_path.is_empty() {
917	None
918	} else {
919	let git = self.read_git(&repo).await?;
920	git.read_file(&a.git_ref, &a.file_path).await?
921	};
922	let Some(bytes) = bytes else {
923	return Ok(Outcome::fail(FailureCode::NotFound, "No such file."));
924	};
925	Ok(Outcome::Ok(BlobView {
926	repo,
927	git_ref: a.git_ref,
928	path: a.file_path,
929	size: bytes.len() as u64,
930	text: text_of(bytes),
931	}))
932	}
933
934	async fn blame(&self, a: BlameArgs) -> Result<Outcome<Blame>> {
935	let Some(repo) = self.readable(&a.path, &a.viewer).await? else {
936	return Ok(not_found());
937	};
938	let git = self.read_git(&repo).await?;
939	let git_ref = a.git_ref.unwrap_or_else(\|\| repo.default_branch.clone());
940	Ok(match blame::blame(&git, &git_ref, &a.file_path).await? {
941	Some(blame) => Outcome::Ok(blame),
942	None => not_found(),
943	})
944	}
945
946	async fn log(&self, a: LogArgs) -> Result<Outcome<Vec<Commit>>> {
947	let Some(repo) = self.readable(&a.path, &a.viewer).await? else {
948	return Ok(not_found());
949	};
950	let git = self.read_git(&repo).await?;
951	let git_ref = a.git_ref.unwrap_or_else(\|\| repo.default_branch.clone());
952	Ok(Outcome::Ok(git.log(&git_ref, a.limit).await?))
953	}
954
955	/// The commits that changed a file or directory, newest first: the
956	/// first-parent chain walked within `PATH_LOG_WALK_MS` (or the caller's
957	/// budget) and `last_commits::MAX_READS`.
958	async fn path_log(&self, a: g1t_contracts::repos::PathLogArgs) -> Result<Outcome<g1t_contracts::repos::PathLog>> {
959	let Some(repo) = self.readable(&a.path, &a.viewer).await? else {
960	return Ok(not_found());
961	};
962	let git = self.read_git(&repo).await?;
963	let git_ref = a.git_ref.unwrap_or_else(\|\| repo.default_branch.clone());
964	let Some(head) = git.log(&git_ref, 1).await?.into_iter().next() else {
965	return Ok(Outcome::fail(FailureCode::NotFound, "No such branch, tag or commit."));
966	};
967	let started = worker::Date::now().as_millis();
968	let budget = a.budget_ms.unwrap_or(PATH_LOG_WALK_MS);
969	let out_of_time = move \|\| worker::Date::now().as_millis().saturating_sub(started) > budget;
970	let limit = a.limit.clamp(1, 100) as usize;
971	let (commits, complete) = last_commits::path_log(&git, &head.hash, &a.file_path, limit, &out_of_time, last_commits::MAX_READS).await?;
972	Ok(Outcome::Ok(g1t_contracts::repos::PathLog { commits, complete }))
973	}
974
975	/// Which commit last changed each entry of a directory. A finished
976	/// answer is kept in this colo's cache by repository, head commit and
977	/// path: a commit's history never changes, so it is good for as long as
978	/// it is kept. Every walk also keeps its progress by ref and path
979	/// (last_commits.rs), so the next call goes on from it: from where it
980	/// stopped, or for a new head, only back to the old one.
981	async fn last_commits(&self, a: g1t_contracts::repos::LastCommitsArgs) -> Result<Outcome<g1t_contracts::repos::LastCommits>> {
982	let Some(repo) = self.readable(&a.path, &a.viewer).await? else {
983	return Ok(not_found());
984	};
985	let git = self.read_git(&repo).await?;
986	let git_ref = a.git_ref.unwrap_or_else(\|\| repo.default_branch.clone());
987	let Some(head) = git.log(&git_ref, 1).await?.into_iter().next() else {
988	return Ok(Outcome::fail(FailureCode::NotFound, "No such branch, tag or commit."));
989	};
990	// v2: v1 kept walks cut short at 300 commits as if finished.
991	let key = format!(
992	"https://last-commits.g1t.internal/v2/{}/{}/{}",
993	repo.id,
994	head.hash,
995	a.tree_path.split('/').map(urlencoding_segment).collect::<Vec<_>>().join("/")
996	);
997	let cache = worker::Cache::default();
998	if let Ok(Some(mut kept)) = cache.get(key.as_str(), false).await {
999	if let Ok(found) = kept.json::<g1t_contracts::repos::LastCommits>().await {
1000	return Ok(Outcome::Ok(found));
1001	}
1002	}
1003	let memo = last_commits::Memo::new(&repo.id, &git_ref, &a.tree_path);
1004	let shared = self.shared.as_deref();
1005	let progress = memo.get(shared).await;
1006	// Asked with a budget, the walk stops past it; without one, past
1007	// LAST_COMMITS_WALK_MS, well before the caller's waitUntil ends.
1008	let started = worker::Date::now().as_millis();
1009	let budget = a.budget_ms.unwrap_or(LAST_COMMITS_WALK_MS);
1010	let out_of_time = move \|\| worker::Date::now().as_millis().saturating_sub(started) > budget;
1011	let walk = last_commits::last_commits(&git, &head.hash, &a.tree_path, progress, &out_of_time, last_commits::MAX_READS).await?;
1012	if walk.reads > 0 {
1013	memo.keep(shared, &walk.progress).await;
1014	}
1015	let settled = walk.progress.settled();
1016	let found = g1t_contracts::repos::LastCommits { complete: walk.progress.complete(), entries: walk.progress.found };
1017	if !settled {
1018	return Ok(Outcome::Ok(found));
1019	}
1020	if let Ok(mut response) = worker::Response::from_json(&found) {
1021	let _ = response.headers_mut().set("cache-control", "max-age=604800");
1022	let _ = cache.put(key.as_str(), response).await;
1023	}
1024	Ok(Outcome::Ok(found))
1025	}
1026
1027	/// How far each branch head has moved from the default branch's head,
1028	/// in one call (drift.rs). Each count is kept in this colo's cache by
1029	/// repository and the pair of hashes, for good: neither history can
1030	/// change. A head that moved is the only one walked. A failed read is
1031	/// not kept, and "too far to count" only for a day.
1032	async fn branch_drift(&self, a: BranchDriftArgs) -> Result<Outcome<BranchDrifts>> {
1033	let Some(repo) = self.readable(&a.path, &a.viewer).await? else {
1034	return Ok(not_found());
1035	};
1036	if !store::is_commit_hash(&a.base) {
1037	return Ok(Outcome::fail(FailureCode::Invalid, "The default branch's head is a full commit hash."));
1038	}
1039	let heads: Vec<String> = a.heads.into_iter().take(MAX_DRIFT_HEADS).collect();
1040	let git = self.read_git(&repo).await?;
1041	// v2: answers kept before 2026-10-09 said "no count" for every
1042	// branch whose default branch took a merge since it left (drift.rs).
1043	let key = \|head: &str\| format!("https://drift.g1t.internal/v2/{}/{}/{head}", repo.id, a.base);
1044	let cache = worker::Cache::default();
1045	let (base, kept) = futures_util::future::join(
1046	git.log(&a.base, 1),
1047	futures_util::future::join_all(heads.iter().map(\|head\| {
1048	let (cache, url) = (&cache, key(head));
1049	async move {
1050	if !store::is_commit_hash(head) {
1051	return None;
1052	}
1053	let mut found = cache.get(url.as_str(), false).await.ok()??;
1054	found.json::<BranchDrift>().await.ok()
1055	}
1056	})),
1057	)
1058	.await;
1059	let missing: Vec<String> = heads
1060	.iter()
1061	.zip(&kept)
1062	.filter(\|(head, kept)\| kept.is_none() && store::is_commit_hash(head))
1063	.map(\|(head, _)\| head.clone())
1064	.collect();
1065	let measured = drift::measure(&git, &a.base, &missing).await;
1066	let mut fresh: HashMap<String, BranchDrift> = HashMap::new();
1067	for (head, found) in missing.into_iter().zip(measured) {
1068	let answer = BranchDrift { head: head.clone(), commit: found.commit, drift: found.drift };
1069	if found.settled
1070	&& let Ok(mut response) = worker::Response::from_json(&answer)
1071	{
1072	// A count is kept for good; "too far to count" for a day, so
1073	// a change to how far a walk goes reaches it.
1074	let max_age = if answer.drift.is_some() { "public, max-age=31536000, immutable" } else { "public, max-age=86400" };
1075	let _ = response.headers_mut().set("cache-control", max_age);
1076	let _ = cache.put(key(&head).as_str(), response).await;
1077	}
1078	fresh.insert(head, answer);
1079	}
1080	let branches = heads
1081	.iter()
1082	.zip(kept)
1083	.map(\|(head, kept)\| {
1084	kept.or_else(\|\| fresh.get(head).cloned())
1085	.unwrap_or_else(\|\| BranchDrift { head: head.clone(), commit: None, drift: None })
1086	})
1087	.collect();
1088	Ok(Outcome::Ok(BranchDrifts { base: base.ok().and_then(\|log\| log.into_iter().next()), branches }))
1089	}
1090
1091	/// The repository's tags, newest commit first, at most 100.
1092	async fn tags(&self, a: g1t_contracts::repos::TagsArgs) -> Result<Outcome<Vec<g1t_contracts::repos::Tag>>> {
1093	let Some(repo) = self.readable(&a.path, &a.viewer).await? else {
1094	return Ok(not_found());
1095	};
1096	// Kept until the refs move, as the branch list is (store.rs): listing
1097	// the refs is a round trip to the store on every call otherwise.
1098	let version = refs_cache::usable(registry::refs_state(&repo.id), now_ms()).filter(\|_\| !self.store.on_fallback(&store_key(&repo)));
1099	let kept_at = version.map(\|version\| format!("https://tags.g1t.internal/{}/{version}", repo.id));
1100	if let Some(url) = &kept_at
1101	&& let Ok(Some(mut kept)) = worker::Cache::default().get(url.as_str(), false).await
1102	&& let Ok(tags) = kept.json::<Vec<g1t_contracts::repos::Tag>>().await
1103	{
1104	return Ok(Outcome::Ok(tags));
1105	}
1106	let (tags, complete) = self.read_tags(&repo).await?;
1107	if complete
1108	&& let Some(url) = &kept_at
1109	&& let Ok(mut response) = worker::Response::from_json(&tags)
1110	{
1111	let _ = response.headers_mut().set("cache-control", "public, max-age=300");
1112	let _ = worker::Cache::default().put(url.as_str(), response).await;
1113	}
1114	Ok(Outcome::Ok(tags))
1115	}
1116
1117	/// The tags, and whether every one's commit was read (only then kept).
1118	async fn read_tags(&self, repo: &Repo) -> Result<(Vec<g1t_contracts::repos::Tag>, bool)> {
1119	let git = self.store.open(&store_key(repo)).await?;
1120	let access = git.access(Scope::Read).await?;
1121	let named: Vec<(String, String)> = refs::heads_and_tags(refs::all(&access).await?)
1122	.into_iter()
1123	.filter_map(\|(name, hash)\| name.strip_prefix("refs/tags/").map(\|tag\| (tag.to_owned(), hash)))
1124	.collect();
1125	let read = self.read_git(repo).await?;
1126	let commits = futures_util::future::join_all(named.iter().take(MAX_TAGS_READ).map(\|(_, hash)\| read.log(hash, 1))).await;
1127	let complete = commits.iter().all(Result::is_ok);
1128	let mut tags: Vec<g1t_contracts::repos::Tag> = named
1129	.into_iter()
1130	.zip(commits.into_iter().map(\|found\| found.ok().and_then(\|list\| list.into_iter().next())).chain(std::iter::repeat(None)))
1131	.map(\|((name, _), commit)\| g1t_contracts::repos::Tag { name, commit })
1132	.collect();
1133	tags.sort_by(\|a, b\| {
1134	let at = \|tag: &g1t_contracts::repos::Tag\| tag.commit.as_ref().map(\|c\| c.authored_at.clone()).unwrap_or_default();
1135	at(b).cmp(&at(a)).then_with(\|\| b.name.cmp(&a.name))
1136	});
1137	tags.truncate(MAX_TAGS_READ);
1138	Ok((tags, complete))
1139	}
1140
1141	/// The repository's branches, default branch first.
1142	async fn branches(&self, a: BranchesArgs) -> Result<Outcome<Vec<Branch>>> {
1143	let Some(repo) = self.readable(&a.path, &a.viewer).await? else {
1144	return Ok(not_found());
1145	};
1146	let mut branches = self.read_git(&repo).await?.branches().await?;
1147	branches.sort_by_key(\|branch\| branch.name != repo.default_branch);
1148	Ok(Outcome::Ok(branches))
1149	}
1150
1151	/// Whether a pull request's source lacks commits that the branch it
1152	/// would merge into has.
1153	async fn behind(&self, a: BehindArgs) -> Result<bool> {
1154	let Some(source) = self.registry.by_id(&a.source_id).await? else {
1155	return Ok(false);
1156	};
1157	let target = match &source.fork_of {
1158	Some(id) => self.registry.by_id(id).await?,
1159	None => Some(source.clone()),
1160	};
1161	let Some(target) = target else {
1162	return Ok(false);
1163	};
1164	let branch = a.branch.unwrap_or_else(\|\| target.default_branch.clone());
1165	let target_branch = a.target_branch.unwrap_or_else(\|\| target.default_branch.clone());
1166	let target_head = self
1167	.read_git(&target)
1168	.await?
1169	.log(&target_branch, 1)
1170	.await?
1171	.into_iter()
1172	.next()
1173	.map(\|commit\| commit.hash);
1174	let Some(target_head) = target_head else {
1175	return Ok(false);
1176	};
1177	let source_git = self.read_git(&source).await?;
1178	let history = source_git.log(&branch, MAX_ANCESTRY).await?;
1179	if history.is_empty() {
1180	return Ok(false);
1181	}
1182	Ok(!descends_from(&source_git, &history, &target_head).await?)
1183	}
1184
1185	/// The files a pull request's source and the default branch it would
1186	/// merge into each changed since they last agreed. Where the two lists
1187	/// share no file, the merge cannot conflict; where they do, it may.
1188	async fn divergence(&self, a: BehindArgs) -> Result<Option<Divergence>> {
1189	let Some(source) = self.registry.by_id(&a.source_id).await? else {
1190	return Ok(None);
1191	};
1192	let target = match &source.fork_of {
1193	Some(id) => self.registry.by_id(id).await?,
1194	None => Some(source.clone()),
1195	};
1196	let Some(target) = target else {
1197	return Ok(None);
1198	};
1199	let branch = a.branch.unwrap_or_else(\|\| target.default_branch.clone());
1200	let target_branch = a.target_branch.unwrap_or_else(\|\| target.default_branch.clone());
1201	let source_git = self.read_git(&source).await?;
1202	let target_git = self.read_git(&target).await?;
1203	// The target's side is the same for every pull request into it, and
1204	// worked out once per head (coalesce.rs).
1205	let (history, side) = futures_util::future::try_join(
1206	source_git.log(&branch, MAX_ANCESTRY),
1207	self.target_side(&target, &target_git, &target_branch),
1208	)
1209	.await?;
1210	let target_history = &side.history;
1211	let (Some(head), Some(base)) = (history.first(), target_history.first()) else {
1212	return Ok(None);
1213	};
1214	let behind = !descends_from(&source_git, &history, &base.hash).await?;
1215	let merge_base = nearest_ancestor_in(&source_git, &history, &side.shared).await?;
1216	let mut divergence = Divergence {
1217	head: head.hash.clone(),
1218	base: base.hash.clone(),
1219	merge_base: merge_base.clone(),
1220	behind,
1221	..Divergence::default()
1222	};
1223	let merge_base_tree = match &merge_base {
1224	Some(hash) => target_history
1225	.iter()
1226	.find(\|commit\| commit.hash == *hash)
1227	.map(\|commit\| commit.tree_hash.clone()),
1228	None => None,
1229	};
1230	let Some(merge_base_tree) = merge_base_tree else {
1231	// No common history to compare from: say nothing is known.
1232	divergence.truncated = true;
1233	return Ok(Some(divergence));
1234	};
1235	let (ours, truncated_ours) =
1236	diff::changed_paths(&source_git, Some(&merge_base_tree), &head.tree_hash).await?;
1237	divergence.ours = ours;
1238	divergence.truncated = truncated_ours;
1239	if behind {
1240	let now = now_ms();
1241	let key = (target.id.clone(), merge_base_tree.clone(), base.tree_hash.clone());
1242	let (theirs, truncated_theirs) = match THEIRS.with(\|memo\| memo.borrow().get(&key, now)) {
1243	Some(kept) => kept,
1244	None => {
1245	let found = diff::changed_paths(&target_git, Some(&merge_base_tree), &base.tree_hash).await?;
1246	THEIRS.with(\|memo\| memo.borrow_mut().put(key, found.clone(), now));
1247	found
1248	}
1249	};
1250	divergence.theirs = theirs;
1251	divergence.truncated \|= truncated_theirs;
1252	}
1253	Ok(Some(divergence))
1254	}
1255
1256	/// A target branch's history from its head, worked out once per head
1257	/// for every pull request asking about it (coalesce.rs). The head is
1258	/// read under the refs version; the history by its hash, which the
1259	/// object cache keeps for good.
1260	async fn target_side<R: GitRepo>(&self, target: &Repo, git: &R, branch: &str) -> Result<Rc<coalesce::TargetSide>> {
1261	let now = now_ms();
1262	let key = refs_cache::usable(registry::refs_state(&target.id), now)
1263	.map(\|version\| (target.id.clone(), branch.to_owned(), version));
1264	if let Some(key) = &key
1265	&& let Some(side) = TARGETS.with(\|memo\| memo.borrow().get(key, now))
1266	{
1267	return Ok(side);
1268	}
1269	let history = match git.log(branch, 1).await?.first() {
1270	Some(head) => git.log(&head.hash, MAX_ANCESTRY).await?,
1271	None => Vec::new(),
1272	};
1273	let side = coalesce::TargetSide::new(history);
1274	if let Some(key) = key {
1275	TARGETS.with(\|memo\| memo.borrow_mut().put(key, side.clone(), now));
1276	}
1277	Ok(side)
1278	}
1279
1280	async fn head(&self, a: HeadArgs) -> Result<Option<String>> {
1281	let Some(repo) = self.registry.by_id(&a.repo_id).await? else {
1282	return Ok(None);
1283	};
1284	let branch = if a.branch.is_empty() { &repo.default_branch } else { &a.branch };
1285	let git = self.read_git(&repo).await?;
1286	Ok(git
1287	.log(branch, 1)
1288	.await?
1289	.into_iter()
1290	.next()
1291	.map(\|commit\| commit.hash))
1292	}
1293
1294	async fn delete_branch(&self, a: DeleteBranchArgs) -> Result<Outcome<bool>> {
1295	if !deletable_branch(&a.branch, a.head.as_deref()) {
1296	return Ok(Outcome::fail(
1297	FailureCode::Forbidden,
1298	"Only branches g1t made for itself can be deleted this way.",
1299	));
1300	}
1301	let Some(repo) = self.registry.by_id(&a.repo_id).await? else {
1302	return Ok(not_found());
1303	};
1304	if a.branch == repo.default_branch {
1305	return Ok(Outcome::fail(FailureCode::Forbidden, "The default branch is never deleted."));
1306	}
1307	let repo = match self.unpaused(repo).await? {
1308	Ok(repo) => repo,
1309	Err((code, message)) => return Ok(Outcome::fail(code, message)),
1310	};
1311	self.live(&repo).await?;
1312	let git = self.store.open(&store_key(&repo)).await?;
1313	let Some(old) = git
1314	.branches()
1315	.await?
1316	.into_iter()
1317	.find(\|branch\| branch.name == a.branch)
1318	.map(\|branch\| branch.hash)
1319	else {
1320	return Ok(Outcome::Ok(false));
1321	};
1322	// Moved since the caller looked: someone else's commits are on it.
1323	if a.head.as_deref().is_some_and(\|head\| head != old) {
1324	return Ok(Outcome::fail(FailureCode::Conflict, format!("{} moved, so it was left alone.", a.branch)));
1325	}
1326	let access = git.access(Scope::Write).await?;
1327	let deleted = land::delete_ref(&access, &a.branch, &old).await?;
1328	self.refs_moved(&repo.id).await;
1329	if let Err(reason) = deleted {
1330	return Ok(Outcome::fail(
1331	FailureCode::Conflict,
1332	format!("{} could not be deleted: {reason}", a.branch),
1333	));
1334	}
1335	Ok(Outcome::Ok(true))
1336	}
1337
1338	async fn fork_for_pull(&self, a: ForkArgs) -> Result<Outcome<Repo>> {
1339	let viewer = Some(a.actor.clone());
1340	let Some(source) = self
1341	.registry
1342	.by_id(&a.source_id)
1343	.await?
1344	.filter(\|repo\| can_read(repo, &viewer))
1345	else {
1346	return Ok(not_found());
1347	};
1348	if let Some((code, message)) = lifecycle::read_only_refusal(&source) {
1349	return Ok(Outcome::fail(code, message));
1350	}
1351	// Its working copy is made in its namespace: not while it moves.
1352	let source = match self.unpaused(source).await? {
1353	Ok(source) => source,
1354	Err((code, message)) => return Ok(Outcome::fail(code, message)),
1355	};
1356	let now = now_ms();
1357	let fork = Repo {
1358	id: new_id("rep", now),
1359	namespace: PULLS_NAMESPACE.to_owned(),
1360	name: a.pull_id.clone(),
1361	description: None,
1362	// A fork is exactly as visible as the repo it came from.
1363	is_private: source.is_private,
1364	owner_id: a.actor.id.clone(),
1365	default_branch: source.default_branch.clone(),
1366	fork_of: Some(source.id.clone()),
1367	protected: false,
1368	created_at: rfc3339(now),
1369	topics: Vec::new(),
1370	website: None,
1371	archived_at: None,
1372	};
1373	// Artifacts forks within a namespace: the copy goes where its
1374	// repository is.
1375	let (namespace, _) = store::locate(&store_key(&source));
1376	self.registry
1377	.claim_store_key(&fork, Some(&namespace), &self.store.default_namespace())
1378	.await?;
1379	self.store
1380	.open(&store_key(&source))
1381	.await?
1382	.fork(&store_key(&fork))
1383	.await?;
1384	self.registry.insert(&fork).await?;
1385	self.publish(NewEvent {
1386	kind: "repo.forked",
1387	source: SOURCE,
1388	repo_id: Some(source.id.clone()),
1389	actor: Some(a.actor.id),
1390	data: RepoForked {
1391	repo_id: fork.id.clone(),
1392	source_repo_id: source.id,
1393	pull_id: a.pull_id,
1394	},
1395	})
1396	.await?;
1397	Ok(Outcome::Ok(fork))
1398	}
1399
1400	async fn git_access(&self, a: GitAccessArgs) -> Result<Outcome<GitAccess>> {
1401	let found = self.registry.by_path(&a.path).await?;
1402	Ok(match self.authorize_git(&a.path, &a.viewer, a.service, found).await? {
1403	Outcome::Ok(repo) => {
1404	self.live(&repo).await?;
1405	let write = a.service == GitService::ReceivePack;
1406	if write {
1407	// A push with this credential would not pass through
1408	// here, so nothing that lists the refs is kept until it
1409	// has expired (see refs_cache.rs).
1410	let until = now_ms() + store::CREDENTIAL_LIFE_MS + 60_000;
1411	if let Err(error) = self.registry.refs_open(&repo.id, until).await {
1412	// Before the column exists nothing is kept anyway.
1413	if registry::refs_state(&repo.id).is_some() {
1414	return Err(error);
1415	}
1416	}
1417	}
1418	let scope = if write { Scope::Write } else { Scope::Read };
1419	Outcome::Ok(self.store.handout(&store_key(&repo), scope).await?)
1420	}
1421	Outcome::Fail(failure) => Outcome::Fail(failure),
1422	})
1423	}
1424
1425	/// The repository at `path` (`found`, as just read), if the viewer may
1426	/// use `service` on it: fetch from it, or push to it. A push to a path
1427	/// with nothing there makes the repository, in a workspace the pusher
1428	/// belongs to.
1429	async fn authorize_git(
1430	&self,
1431	path: &RepoPath,
1432	viewer: &Viewer,
1433	service: GitService,
1434	found: Option<Repo>,
1435	) -> Result<Outcome<Repo>> {
1436	let mut a = GitAccessArgs {
1437	path: path.clone(),
1438	viewer: viewer.clone(),
1439	service,
1440	};
1441	let write = a.service == GitService::ReceivePack;
1442	// An access token: pushing needs code:write, reading a private
1443	// repository code:read. A public repository reads as it would for
1444	// anyone. Which repositories a token reaches is its owner's, checked
1445	// below as for anyone.
1446	if let Some(access) = a.viewer.as_ref().and_then(\|user\| user.token.as_deref()).cloned() {
1447	// A workflow job's token, and a deploy key, reach their own
1448	// repository only; a job's also the working copies of that
1449	// repository's pull requests, where their heads are.
1450	let name = format!("{}/{}", path.namespace, path.name);
1451	let source = match found.as_ref().and_then(\|repo\| repo.fork_of.as_deref()) {
1452	Some(source_id) if g1t_contracts::scopes::decide_repo(&access, &name).is_some() => self
1453	.registry
1454	.by_id(source_id)
1455	.await?
1456	.map(\|source\| format!("{}/{}", source.namespace, source.name)),
1457	_ => None,
1458	};
1459	let public = found.as_ref().is_some_and(\|repo\| !repo.is_private);
1460	if let Some(why) = git_token_refusal(&access, &name, source.as_deref(), write, public, found.is_some()) {
1461	return Ok(Outcome::fail(FailureCode::Forbidden, format!("{why}\n")));
1462	}
1463	if !write && !access.allows(g1t_contracts::scopes::Scope::CodeRead) {
1464	a.viewer = None;
1465	}
1466	}
1467
1468	// Anonymous callers are asked to authenticate whether or not the repo
1469	// exists, so private repos cannot be told apart from missing ones.
1470	let denied = \|\| match &a.viewer {
1471	Some(_) => not_found(),
1472	None => Outcome::fail(FailureCode::Unauthenticated, "Authentication required."),
1473	};
1474	// A run's token works through the API only: its sandbox has its
1475	// own way to push, to its own pull request.
1476	if a.viewer.as_ref().is_some_and(\|user\| user.kind == PrincipalKind::Agent) {
1477	return Ok(Outcome::fail(
1478	FailureCode::Forbidden,
1479	"A run's token cannot be used with git this way.",
1480	));
1481	}
1482	if let (true, Some(user)) = (write, &a.viewer)
1483	&& !user.verified
1484	{
1485	return Ok(Outcome::fail(FailureCode::Forbidden, UNVERIFIED));
1486	}
1487	let repo = match found {
1488	Some(repo) => {
1489	let allowed = if write {
1490	can_write(&repo, &a.viewer)
1491	} else {
1492	self.may_read(&repo, &a.viewer).await?
1493	};
1494	if !allowed {
1495	return Ok(denied());
1496	}
1497	// An archived repository, or a pull request's copy of one,
1498	// is read-only.
1499	if write {
1500	let archived = match &repo.fork_of {
1501	Some(source) => self.registry.by_id(source).await?,
1502	None => Some(repo.clone()),
1503	};
1504	match archived {
1505	Some(source) => {
1506	if let Some((code, message)) = lifecycle::read_only_refusal(&source) {
1507	return Ok(Outcome::fail(code, format!("{message}\n")));
1508	}
1509	}
1510	// The repository it was copied from is deleted.
1511	None => return Ok(denied()),
1512	}
1513	}
1514	repo
1515	}
1516	None => {
1517	// Push to create, in a workspace the pusher belongs to.
1518	let owner = a
1519	.viewer
1520	.as_ref()
1521	.filter(\|user\| write && user.is_member(&a.path.namespace.to_lowercase()));
1522	let Some(owner) = owner else {
1523	return Ok(denied());
1524	};
1525	let created = self.create(push_to_create(owner, &a.path)).await?;
1526	match created {
1527	Outcome::Ok(repo) => repo,
1528	Outcome::Fail(failure) => return Ok(Outcome::Fail(failure)),
1529	}
1530	}
1531	};
1532	// A push, or a credential to push with, waits while the repository
1533	// moves between namespaces (moves.rs), and goes to where it is now.
1534	if write {
1535	return Ok(match self.unpaused(repo).await? {
1536	Ok(repo) => Outcome::Ok(repo),
1537	Err((code, message)) => Outcome::fail(code, format!("{message}\n")),
1538	});
1539	}
1540	Ok(Outcome::Ok(repo))
1541	}
1542
1543	async fn land(&self, a: LandArgs) -> Result<Outcome<Landed>> {
1544	let actor: Viewer = Some(a.actor.clone());
1545	let Some(source) = self.registry.by_id(&a.source_id).await? else {
1546	return Ok(not_found());
1547	};
1548	// A fork lands on the repository it came from; a branch on its own.
1549	let target = match &source.fork_of {
1550	Some(id) => self.registry.by_id(id).await?,
1551	None => Some(source.clone()),
1552	};
1553	let Some(target) = target.filter(\|repo\| can_read(repo, &actor)) else {
1554	return Ok(not_found());
1555	};
1556	if !registry::can(&target, &actor, Capability::Merge) {
1557	return Ok(Outcome::fail(
1558	FailureCode::Forbidden,
1559	access::needs(Capability::Merge, &format!("{}/{}", target.namespace, target.name)),
1560	));
1561	}
1562	if !a.actor.verified {
1563	return Ok(Outcome::fail(FailureCode::Forbidden, UNVERIFIED));
1564	}
1565	if let Some((code, message)) = lifecycle::read_only_refusal(&target) {
1566	return Ok(Outcome::fail(code, message));
1567	}
1568	// Moving between namespaces: wait for it (moves.rs). Both are read
1569	// again once it is done, for their new keys.
1570	let (source, target) = match (self.unpaused(source).await?, self.unpaused(target).await?) {
1571	(Ok(source), Ok(target)) => (source, target),
1572	(Err((code, message)), _) \| (_, Err((code, message))) => return Ok(Outcome::fail(code, message)),
1573	};
1574
1575	let branch = &a.target_branch.clone().unwrap_or_else(\|\| target.default_branch.clone());
1576	let from_fork = source.id != target.id;
1577	let source_branch = match a.branch {
1578	Some(name) if !from_fork && name == *branch => {
1579	return Ok(Outcome::fail(
1580	FailureCode::Invalid,
1581	format!("{branch} cannot be merged into itself."),
1582	));
1583	}
1584	Some(name) => name,
1585	None if from_fork => branch.clone(),
1586	None => {
1587	return Ok(Outcome::fail(
1588	FailureCode::Invalid,
1589	"Say which branch to merge.",
1590	));
1591	}
1592	};
1593
1594	self.live(&source).await?;
1595	let source_git = self.store.open(&store_key(&source)).await?;
1596	let target_git = self.store.open(&store_key(&target)).await?;
1597	let history = source_git.log(&source_branch, MAX_ANCESTRY).await?;
1598	let Some(new) = history.first().map(\|commit\| commit.hash.clone()) else {
1599	return Ok(Outcome::fail(
1600	FailureCode::Conflict,
1601	"This pull request has no commits to merge.",
1602	));
1603	};
1604	let Some(new) = land::checked_commit(&new, a.expected_commit.as_deref()) else {
1605	return Ok(Outcome::fail(FailureCode::Conflict, "The source branch changed after it was checked. Test it again before landing."));
1606	};
1607	let old = target_git
1608	.log(branch, 1)
1609	.await?
1610	.into_iter()
1611	.next()
1612	.map(\|commit\| commit.hash);
1613
1614	if old.as_deref() == Some(new.as_str()) {
1615	return Ok(Outcome::Ok(Landed {
1616	commit: new,
1617	previous: None,
1618	}));
1619	}
1620	if a.expected_commit.is_some() && old.is_some() {
1621	// A prior attempt may have published this exact commit and stopped
1622	// before recording the merge; another change can already follow it.
1623	let target_history = target_git.log(branch, MAX_ANCESTRY).await?;
1624	if descends_from(&target_git, &target_history, &new).await? {
1625	return Ok(Outcome::Ok(Landed { commit: new, previous: None }));
1626	}
1627	}
1628	// Moving the branch to a commit that does not descend from its
1629	// current head would discard whatever landed in between.
1630	if let Some(old) = &old
1631	&& !descends_from(&source_git, &history, old).await?
1632	{
1633	let remedy = if from_fork {
1634	format!("Pull {branch} into the pull request's fork, push, and merge again.")
1635	} else {
1636	format!("Merge {branch} into {source_branch}, push, and merge again.")
1637	};
1638	return Ok(Outcome::fail(
1639	FailureCode::Conflict,
1640	format!("{branch} has moved since this pull request was opened. {remedy}"),
1641	));
1642	}
1643
1644	// For a branch the objects are already in the target; sending them
1645	// again is harmless and keeps one way of moving a ref.
1646	let source_access = source_git.access(Scope::Read).await?;
1647	let target_access = target_git.access(Scope::Write).await?;
1648	let pushed =
1649	land::fast_forward(&source_access, &target_access, branch, old.as_deref(), &new)
1650	.await?;
1651	self.refs_moved(&target.id).await;
1652	if let Err(reason) = pushed {
1653	// Most often another pull request landed between the check and the push.
1654	return Ok(Outcome::fail(
1655	FailureCode::Conflict,
1656	format!("{branch} could not be updated: {reason}"),
1657	));
1658	}
1659	self.publish_push(
1660	&target,
1661	&format!("refs/heads/{branch}"),
1662	old.as_deref(),
1663	&new,
1664	Some(&a.actor),
1665	None,
1666	)
1667	.await?;
1668	Ok(Outcome::Ok(Landed {
1669	commit: new,
1670	previous: old,
1671	}))
1672	}
1673
1674	async fn compare(&self, a: CompareArgs) -> Result<Outcome<Comparison>> {
1675	let Some(repo) = self
1676	.visible(self.registry.by_id(&a.repo_id).await?, &a.viewer)
1677	.await?
1678	else {
1679	return Ok(not_found());
1680	};
1681	let git = self.read_git(&repo).await?;
1682	let head_ref = a.head.as_deref().unwrap_or(&repo.default_branch);
1683	// A pull request into another branch is compared from where it
1684	// left that branch.
1685	let base_branch = a.base_branch.clone();
1686	// The head's history is only searched when the base is worked out
1687	// from another branch.
1688	let depth = if a.base.is_some() \|\| is_commit_hash(head_ref) { 1 } else { MAX_ANCESTRY };
1689	let history = git.log(head_ref, depth).await?;
1690	let Some(head) = history.first() else {
1691	return Ok(Outcome::fail(
1692	FailureCode::Conflict,
1693	"There are no commits to compare.",
1694	));
1695	};
1696
1697	// Where the head's history meets the default branch of `against`,
1698	// or the branch asked for.
1699	let shared_with = async \|against: &Repo\| -> Result<Option<String>> {
1700	let against_git = self.read_git(against).await?;
1701	let branch = base_branch.as_deref().unwrap_or(&against.default_branch);
1702	let shared: HashSet<String> = against_git
1703	.log(branch, MAX_ANCESTRY)
1704	.await?
1705	.into_iter()
1706	.map(\|commit\| commit.hash)
1707	.collect();
1708	nearest_ancestor_in(&git, &history, &shared).await
1709	};
1710	let base = match (a.base, &repo.fork_of) {
1711	(Some(base), _) => Some(base),
1712	// A fork is compared with the last commit it shares with the
1713	// repository it came from.
1714	(None, Some(target_id)) => match self.registry.by_id(target_id).await? {
1715	Some(target) => shared_with(&target).await?,
1716	None => None,
1717	},
1718	// A branch, with the point where it left the default branch.
1719	// A single commit, with its first parent.
1720	(None, None) if is_commit_hash(head_ref) => head.parents.first().cloned(),
1721	(None, None) if head_ref != base_branch.as_deref().unwrap_or(&repo.default_branch) => {
1722	shared_with(&repo).await?
1723	}
1724	(None, None) => head.parents.first().cloned(),
1725	};
1726	let base_tree = match &base {
1727	Some(base) => git
1728	.log(base, 1)
1729	.await?
1730	.into_iter()
1731	.next()
1732	.map(\|commit\| commit.tree_hash),
1733	None => None,
1734	};
1735	// Only a few files of it, when asked: how the files a large
1736	// comparison lists without their lines are read, as a page reaches them.
1737	let only = a.paths.as_deref().map(\|paths\| &paths[..paths.len().min(MAX_COMPARED_PATHS)]);
1738	let (files, truncated) =
1739	diff::compare_trees(&git, base_tree.as_deref(), &head.tree_hash, only).await?;
1740	Ok(Outcome::Ok(Comparison {
1741	base,
1742	head: head.hash.clone(),
1743	files,
1744	truncated,
1745	}))
1746	}
1747
1748	/// Reports that `git_ref` of `repo` (a full ref) now points to `after`,
1749	/// moved by `actor` (marked when that was a workflow job's token).
1750	/// `commits` is how many the move brought, when the caller knows: one
1751	/// for a file committed on the site or a branch brought up to date.
1752	async fn publish_push(
1753	&self,
1754	repo: &Repo,
1755	git_ref: &str,
1756	before: Option<&str>,
1757	after: &str,
1758	actor: Option<&User>,
1759	commits: Option<u32>,
1760	) -> Result<()> {
1761	let caused_by_job = actor.and_then(g1t_contracts::events::job_run_of).map(str::to_owned);
1762	self.publish_git_push(repo, git_ref, before, after, actor.map(\|user\| user.id.clone()), false, caused_by_job, commits)
1763	.await
1764	}
1765
1766	/// `publish_push`, saying whether the push reached the store without
1767	/// being scanned for secrets first.
1768	#[allow(clippy::too_many_arguments)]
1769	async fn publish_git_push(
1770	&self,
1771	repo: &Repo,
1772	git_ref: &str,
1773	before: Option<&str>,
1774	after: &str,
1775	actor: Option<String>,
1776	unscanned: bool,
1777	caused_by_job: Option<String>,
1778	commits: Option<u32>,
1779	) -> Result<()> {
1780	self.publish(NewEvent {
1781	kind: "git.push",
1782	source: SOURCE,
1783	repo_id: Some(repo.id.clone()),
1784	actor,
1785	data: GitPush {
1786	repo_id: repo.id.clone(),
1787	git_ref: git_ref.to_owned(),
1788	before: before.map(str::to_owned),
1789	after: after.to_owned(),
1790	default_branch: git_ref.strip_prefix("refs/heads/")
1791	== Some(repo.default_branch.as_str()),
1792	unscanned,
1793	caused_by_job,
1794	commits,
1795	},
1796	})
1797	.await
1798	}
1799
1800	/// Git over HTTPS. Only what decides the answer happens before it:
1801	/// the repository, who is asking and whether they may, the free
1802	/// workspace limits, push protection, and the store's own answer. The
1803	/// audit entry and what a push changed are recorded once git has its
1804	/// answer. Each answer says how long its steps took (`Server-Timing`).
1805	async fn git_http(&self, request: Request, env: &Env, ctx: &Context) -> Result<Response> {
1806	let mut timing = git_http::Timing::start();
1807	let Some(git) = git_http::parse(&request.url()?) else {
1808	return Response::error("Not found", 404);
1809	};
1810	let response = match self.answer_git(request, &git, env, ctx, &mut timing).await {
1811	Ok(response) => response,
1812	// The git store is busy: git hears when to try again.
1813	Err(error) => match resilience::busy(&error.to_string()) {
1814	Some(busy) => git_http::busy_response(busy)?,
1815	None => return Err(error),
1816	},
1817	};
1818	timing.apply(response)
1819	}
1820
1821	async fn answer_git(
1822	&self,
1823	request: Request,
1824	git: &git_http::GitRequest,
1825	env: &Env,
1826	ctx: &Context,
1827	timing: &mut git_http::Timing,
1828	) -> Result<Response> {
1829	let write = git.service == GitService::ReceivePack;
1830	let get = request.method() == Method::Get;
1831	let identity = env.service("IDENTITY")?;
1832	// The repository and the caller's credentials, at once. A fetch may
1833	// go by the row as read a moment ago, for the same clone's next
1834	// request; a push always reads it. Anonymous callers cost nothing.
1835	let lookup = async {
1836	if write {
1837	self.registry.by_path(&git.path).await
1838	} else {
1839	self.registry.by_path_recent(&git.path).await
1840	}
1841	};
1842	let (found, viewer) =
1843	futures_util::future::join(lookup, git_http::viewer(&request, &identity)).await;
1844	let mut found = found?;
1845	timing.mark("repo");
1846	// A workspace alias staff set (identity's aliases.rs: `g1t` for
1847	// `flagon-io`) is answered in place, as the repository under the
1848	// workspace's slug: pushes and some clients do not follow
1849	// redirects. Everything after this sees only the workspace's slug.
1850	let aliased = match found {
1851	Some(_) => None,
1852	None => git_http::aliased(git, &identity).await?,
1853	};
1854	if let Some(aliased) = &aliased {
1855	found = if write {
1856	self.registry.by_path(&aliased.path).await?
1857	} else {
1858	self.registry.by_path_recent(&aliased.path).await?
1859	};
1860	timing.mark("alias");
1861	}
1862	let git = aliased.as_ref().unwrap_or(git);
1863	if found.is_none() {
1864	// A workspace that was renamed: git follows a redirect when it
1865	// first asks for refs, and uses the new address from then on.
1866	// A repository transferred to another workspace: the same, to
1867	// its new path. Fetches and pushes both follow either.
1868	let url = request.url()?;
1869	let (renamed, moved) = futures_util::future::join(
1870	git_http::renamed(&url, &identity),
1871	self.registry.resolve_moved(&git.path),
1872	)
1873	.await;
1874	timing.mark("moved");
1875	if let Some(location) = renamed? {
1876	return git_http::moved(&location, get);
1877	}
1878	if let Some(now) = moved?
1879	&& let Some(location) = git_http::transferred(&url, &now)
1880	{
1881	return git_http::moved(&location, get);
1882	}
1883	}
1884	let viewer = viewer?;
1885	// A person who has not confirmed their email address can do
1886	// nothing with git until they do: told so, not asked to sign in.
1887	if viewer.as_ref().is_some_and(g1t_contracts::User::awaits_confirmation) {
1888	let site = request.url()?.origin().ascii_serialization();
1889	return git_http::refuse(Outcome::<()>::fail(
1890	FailureCode::Forbidden,
1891	g1t_contracts::accounts::confirm_email_first(&site),
1892	));
1893	}
1894	// A run credential is checked against its grants, then acts as the
1895	// person it works for. See run_access.rs.
1896	let (request, viewer, audit) = match self.admit_git(request, git, viewer, found.as_ref()).await? {
1897	run_access::Admitted::Go { request, viewer, entry } => (request, viewer, entry),
1898	run_access::Admitted::Refused(response) => return Ok(response),
1899	};
1900	let mut after = AfterGit {
1901	audit,
1902	status: 0,
1903	message: None,
1904	push: None,
1905	};
1906	let repo = match self.authorize_git(&git.path, &viewer, git.service, found).await? {
1907	Outcome::Ok(repo) => repo,
1908	refused => {
1909	let response = git_http::refuse(refused)?;
1910	after.ended(response.status_code(), None);
1911	after.spawn(env, ctx);
1912	return Ok(response);
1913	}
1914	};
1915	// A pull request's working copy removed after it closed is made
1916	// again before git uses it (forks.rs).
1917	self.live(&repo).await?;
1918	timing.mark("access");
1919	// Clones check out the default branch g1t keeps, which can have
1920	// changed since the store made the repository.
1921	let default_branch = repo.fork_of.is_none().then(\|\| repo.default_branch.clone());
1922	let key = store_key(&repo);
1923	let scope = if write { Scope::Write } else { Scope::Read };
1924	let mut request = request;
1925	let protocol = refs_cache::protocol(request.headers().get("git-protocol")?.as_deref());
1926	// A fetch's POST is read here, to tell an `ls-refs` from a fetch of
1927	// objects; the store would have it read in full anyway.
1928	let body = if !write && !get { Some(request.bytes().await?) } else { None };
1929	// What it asks the store, for the meters (meters.rs).
1930	let call = git_ops::classify(git.service, git.endpoint, get, body.as_deref());
1931	// Answers kept from the usual store may name refs the fallback
1932	// store does not have (fallback.rs): none are used, or kept.
1933	let fallback = self.store.on_fallback(&key);
1934	// An answer that lists refs may have been kept: see refs_cache.rs.
1935	let kept_key = refs_cache::kind(git, get, protocol, body.as_deref())
1936	.filter(\|_\| !fallback)
1937	.zip(refs_cache::usable(registry::refs_state(&repo.id), now_ms()))
1938	.map(\|(kind, version)\| {
1939	refs_cache::Key::new(&repo.id, version, default_branch.as_deref(), protocol, &kind)
1940	});
1941	// A fresh clone's pack may have been kept too: see pack_cache.rs.
1942	// Under the same refs version, so never across a change to them.
1943	let pack_key = self
1944	.packs
1945	.as_ref()
1946	.filter(\|_\| !fallback)
1947	.and_then(\|_\| {
1948	let encoding = request.headers().get("content-encoding").ok().flatten();
1949	pack_cache::cacheable(git, get, protocol, encoding.as_deref(), body.as_deref())
1950	})
1951	.zip(refs_cache::usable(registry::refs_state(&repo.id), now_ms()))
1952	.map(\|(normalized, version)\| pack_cache::Key::new(&repo.id, version, &normalized));
1953	// A kept answer and the free workspace limits, with a kept
1954	// credential and, for a push, what the repository holds looked up
1955	// alongside. A kept answer goes back without waiting for the
1956	// credential, which it does not need.
1957	let pushing = write && !get;
1958	let ((answer, pack, (limited, held)), kept_access) = {
1959	let shared = self.shared.as_deref();
1960	let answer_and_limits = std::pin::pin!(futures_util::future::join3(
1961	async {
1962	match &kept_key {
1963	Some(kept_key) => refs_cache::get(shared, kept_key).await,
1964	None => None,
1965	}
1966	},
1967	async {
1968	match (&pack_key, self.packs.as_deref()) {
1969	(Some(pack_key), Some(packs)) => pack_cache::get(packs, pack_key).await,
1970	_ => None,
1971	}
1972	},
1973	futures_util::future::join(self.git_limits(call, git, &repo, env), async {
1974	if pushing { Some(self.held(&repo).await) } else { None }
1975	}),
1976	));
1977	let kept_access = std::pin::pin!(self.store.kept_access(&key, scope));
1978	match futures_util::future::select(answer_and_limits, kept_access).await {
1979	futures_util::future::Either::Left((first, kept_access)) => {
1980	let answered = first.0.is_some() \|\| first.1.is_some() \|\| matches!(first.2.0, Ok(Some(_)) \| Err(_));
1981	(first, if answered { None } else { kept_access.await })
1982	}
1983	futures_util::future::Either::Right((kept_access, first)) => (first.await, kept_access),
1984	}
1985	};
1986	timing.mark("kept");
1987	// A kept pack first: it never reaches the store, so it is never an
1988	// operation, and a free workspace past its operation cap still gets
1989	// it. (The other limits are a push's, and a pack is only a fetch.)
1990	if let Some(kept) = pack {
1991	timing.note("pack", "hit");
1992	let sent = body.as_ref().map_or(0, \|body\| body.len() as u64);
1993	meters::record(pack_cache::HIT, &key, sent, kept.size);
1994	after.ended(200, None);
1995	after.spawn(env, ctx);
1996	return kept.response();
1997	}
1998	if let Some((response, status, message)) = limited? {
1999	after.ended(status, Some(message.to_owned()));
2000	after.spawn(env, ctx);
2001	return Ok(response);
2002	}
2003	if pack_key.is_some() {
2004	timing.note("pack", "miss");
2005	}
2006	if let (Some((entry, found)), Some(kept_key)) = (answer, &kept_key) {
2007	timing.note("refs", found.as_str());
2008	if found == refs_cache::Found::Shared {
2009	let (kept_key, entry) = (kept_key.clone(), entry.clone());
2010	ctx.wait_until(async move { refs_cache::keep_in_colo(&kept_key, &entry).await });
2011	}
2012	// Never reached the store: never an operation.
2013	meters::record(call.cached_meter(), &key, 0, entry.body.len() as u64);
2014	after.ended(200, None);
2015	after.spawn(env, ctx);
2016	return entry.response();
2017	}
2018	if kept_key.is_some() {
2019	timing.note("refs", "miss");
2020	}
2021	// An anonymous fetch the store is about to answer: an operation for
2022	// the repository's workspace, so limited per repository (limits.rs).
2023	if limits::counts_as_anonymous_fetch(call, viewer.is_none())
2024	&& g1t_kit::limits::check(env, limits::ANONYMOUS_FETCH, repo.id.clone()).await.limited()
2025	{
2026	let response = limits::too_many_anonymous_fetches(&format!("{}/{}", repo.namespace, repo.name))?;
2027	after.ended(429, Some("Too many anonymous fetches.".to_owned()));
2028	after.spawn(env, ctx);
2029	return Ok(response);
2030	}
2031	// The store's credential: one made a moment ago, here or in another
2032	// isolate (see store.rs), or a new one.
2033	let access = match kept_access {
2034	Some((access, from)) => {
2035	timing.note("cred", from.as_str());
2036	access
2037	}
2038	None => {
2039	let access = self.store.mint_access(&key, scope).await?;
2040	timing.mark("mint");
2041	timing.note("cred", "mint");
2042	access
2043	}
2044	};
2045	// Should the store turn a kept credential down, a fetch's first
2046	// request is tried again with a new one; the requests after it then
2047	// have that one too.
2048	let again = if get { Some(request.clone()?) } else { None };
2049	// A push's checks: workflow files, the rules of the branches and
2050	// tags it changes, saying which rule and why (rules.rs), and push
2051	// protection, which refuses a push that adds a secret
2052	// (secret_scan.rs). See push_checks.rs.
2053	let checks = async \|head: &[u8], whole: bool, scan: bool\| self.check_receive(&repo, viewer.as_ref(), head, whole, scan).await;
2054	// What a push may bring (pack_limits.rs): the repository's size is
2055	// its own and its pull requests' working copies'.
2056	let limits = if let Some(held) = held {
2057	git_http::PushLimits {
2058	held,
2059	repo_limit: self.repo_limit,
2060	large: self.large_pushes,
2061	..git_http::PushLimits::default()
2062	}
2063	} else {
2064	git_http::PushLimits::default()
2065	};
2066	let mut outcome = git_http::forward(
2067	request,
2068	body,
2069	git,
2070	&access,
2071	checks,
2072	default_branch.as_deref(),
2073	limits,
2074	timing,
2075	)
2076	.await?;
2077	let turned_down = matches!(
2078	&outcome,
2079	git_http::Push::Forwarded(forwarded) if matches!(forwarded.response.status_code(), 401 \| 403)
2080	);
2081	if turned_down {
2082	self.store.forget_access(&key).await;
2083	if let Some(again) = again {
2084	let access = self.store.mint_access(&key, scope).await?;
2085	outcome = git_http::forward(
2086	again,
2087	None,
2088	git,
2089	&access,
2090	async \|_: &[u8], _: bool, _: bool\| Ok(push_checks::Checks::clear()),
2091	default_branch.as_deref(),
2092	git_http::PushLimits::default(),
2093	timing,
2094	)
2095	.await?;
2096	}
2097	}
2098	let forwarded =
2099	match outcome {
2100	git_http::Push::Forwarded(forwarded) => forwarded,
2101	git_http::Push::Refused(response) => {
2102	after.ended(403, Some("The push was declined by rules.".to_owned()));
2103	after.spawn(env, ctx);
2104	return Ok(response);
2105	}
2106	git_http::Push::Blocked(response) => {
2107	after.ended(403, Some("The push adds a secret.".to_owned()));
2108	after.spawn(env, ctx);
2109	return Ok(response);
2110	}
2111	git_http::Push::Declined(response, reason) => {
2112	after.ended(403, Some(format!("The push was declined: {reason}.")));
2113	after.spawn(env, ctx);
2114	return Ok(response);
2115	}
2116	};
2117	if forwarded.from_store {
2118	let received = forwarded
2119	.response
2120	.headers()
2121	.get("content-length")?
2122	.and_then(\|length\| length.parse().ok())
2123	.unwrap_or(0);
2124	meters::record(call.meter(), &key, forwarded.sent, received);
2125	}
2126	timing.mark("store");
2127	let mut response = forwarded.response;
2128	let status = response.status_code();
2129	if write && !get {
2130	// A push: the store has moved its refs once it has answered in
2131	// full, so the answer is read before the change is recorded, and
2132	// only then goes back. Whoever fetches after it sees the push.
2133	let headers = response.headers().clone();
2134	headers.delete("content-length")?;
2135	let report = response.bytes().await?;
2136	self.refs_moved(&repo.id).await;
2137	timing.mark("refs");
2138	response = Response::from_bytes(report)?.with_headers(headers).with_status(status);
2139	} else if let (Some(kept_key), 200) = (&kept_key, status) {
2140	// A miss: this answer is kept for the next to ask.
2141	let headers = response.headers().clone();
2142	headers.delete("content-length")?;
2143	let body = response.bytes().await?;
2144	if let Some(content_type) = headers.get("content-type")? {
2145	let entry = refs_cache::Entry { content_type, body: body.clone() };
2146	if entry.keepable() {
2147	let shared = self.shared.clone();
2148	let kept_key = kept_key.clone();
2149	ctx.wait_until(async move { refs_cache::keep(shared.as_deref(), &kept_key, &entry).await });
2150	}
2151	}
2152	response = Response::from_bytes(body)?.with_headers(headers).with_status(status);
2153	} else if let (Some(pack_key), Some(packs), true) = (&pack_key, &self.packs, forwarded.from_store) {
2154	// A fresh clone the bucket did not have: counted, and its pack
2155	// kept as it streams to git, when it is a whole one.
2156	meters::record(pack_cache::MISS, &key, forwarded.sent, 0);
2157	// Past the repository's limit on writes to the bucket, the pack
2158	// goes to git without being kept (limits.rs).
2159	if status == 200 && !g1t_kit::limits::check(env, limits::PACK_FILL, repo.id.clone()).await.limited() {
2160	let store_key = key.clone();
2161	let measured = Box::new(move \|bytes: u64\| meters::record_bytes(pack_cache::MISS, &store_key, 0, bytes));
2162	let (teed, filling) = pack_cache::tee(response, packs.clone(), pack_key, measured)?;
2163	response = teed;
2164	if let Some(filling) = filling {
2165	let pack_key = pack_key.clone();
2166	ctx.wait_until(async move {
2167	let filled = filling.await;
2168	if !matches!(filled, pack_cache::Filled::Kept { .. } \| pack_cache::Filled::Abandoned) {
2169	worker::console_warn!("pack {} not kept: {filled:?}", pack_key.as_str());
2170	}
2171	});
2172	}
2173	}
2174	}
2175	after.ended(status, None);
2176	if status == 200 && (forwarded.pack_bytes > 0 \|\| !forwarded.pushed.is_empty() \|\| !forwarded.deleted.is_empty()) {
2177	after.push = Some(PushDone {
2178	repo,
2179	pushed: forwarded.pushed,
2180	deleted: forwarded.deleted,
2181	pack_bytes: forwarded.pack_bytes,
2182	caused_by_job: viewer.as_ref().and_then(g1t_contracts::events::job_run_of).map(str::to_owned),
2183	// The calendar credits people, never a job's, an agent's or a workspace's token.
2184	credit: viewer
2185	.as_ref()
2186	.filter(\|user\| user.kind == PrincipalKind::User && g1t_contracts::events::job_run_of(user).is_none())
2187	.map(\|user\| user.id.clone()),
2188	actor: viewer.map(\|user: User\| user.id),
2189	unscanned: forwarded.unscanned,
2190	});
2191	}
2192	after.spawn(env, ctx);
2193	Ok(response)
2194	}
2195
2196	/// The answer for a request a free workspace's limits stop, or a push
2197	/// to a full repository, with its status and reason for the audit log;
2198	/// `None` to go on.
2199	///
2200	/// A clone, fetch or push is a git operation, which the git store
2201	/// charges g1t for: counted for billing once the answer has gone back
2202	/// (meters.rs), and a free workspace far past its share is slowed down
2203	/// rather than charged (see git_ops.rs). Whether it is past it is
2204	/// decided from counts this isolate already holds: the database is not
2205	/// asked on the way. A free workspace is never charged for private
2206	/// storage: once its private repositories hold the free amount, pushes
2207	/// to them stop, checked when a push begins so that git shows the
2208	/// reason. So do pushes to a repository at the store's size limit.
2209	async fn git_limits(
2210	&self,
2211	call: git_ops::GitCall,
2212	git: &git_http::GitRequest,
2213	repo: &Repo,
2214	env: &Env,
2215	) -> Result<Option<(Response, u16, &'static str)>> {
2216	let namespace = git.path.namespace.to_lowercase();
2217	if meters::mapping_now().billable(call.meter()) > 0.0 {
2218	let now = now_ms();
2219	let hour = git_ops::hour_key(&rfc3339(now));
2220	let limits = git_ops::Limits::from_env(env);
2221	if let Some((month, hour_ops)) = git_ops::standing(&namespace, &hour, now)
2222	&& git_ops::slow_down(month + 1, hour_ops + 1, limits.free_cap, limits.hourly)
2223	&& git_ops::is_free_kept(env.service("BILLING").ok().as_ref(), &namespace).await
2224	{
2225	return Ok(Some((
2226	git_ops::too_many(&namespace, limits.free_cap, limits.hourly)?,
2227	429,
2228	"Too many git operations this hour.",
2229	)));
2230	}
2231	}
2232	if git.service == GitService::ReceivePack && git.endpoint == "info/refs" {
2233	let held = self.held(repo).await;
2234	if held >= self.repo_limit {
2235	let message = format!(
2236	"{}/{} holds about {}, the most a repository may hold on g1t, so it takes no more pushes. Delete what you no longer need, or split it: https://docs.g1t.sh/guides/git/#size-limits\n",
2237	repo.namespace,
2238	repo.name,
2239	pack_limits::megabytes(held)
2240	);
2241	return Ok(Some((Response::error(message, 403)?, 403, "The repository is full.")));
2242	}
2243	}
2244	if git.service == GitService::ReceivePack && git.endpoint == "info/refs" && repo.is_private {
2245	let free = git_ops::free_private_bytes(env);
2246	let held = self.registry.private_bytes(&namespace).await.unwrap_or(0);
2247	if git_ops::storage_full(held, free)
2248	&& git_ops::is_free(env.service("BILLING").ok().as_ref(), &namespace).await
2249	{
2250	return Ok(Some((
2251	git_ops::storage_full_response(&namespace, held, free)?,
2252	403,
2253	"Free private storage is full.",
2254	)));
2255	}
2256	}
2257	if git.service == GitService::ReceivePack && git.endpoint == "info/refs" && !repo.is_private {
2258	let free = git_ops::free_public_bytes(env);
2259	if free > 0 {
2260	let held = self.registry.public_bytes(&namespace).await.unwrap_or(0);
2261	if git_ops::public_storage_full(held, free)
2262	&& git_ops::is_free(env.service("BILLING").ok().as_ref(), &namespace).await
2263	{
2264	return Ok(Some((
2265	git_ops::public_storage_full_response(&namespace, held, free)?,
2266	403,
2267	"Free public storage is full.",
2268	)));
2269	}
2270	}
2271	}
2272	Ok(None)
2273	}
2274
2275	/// What a repository and its pull requests' working copies hold, as
2276	/// g1t counts it: read for a push's first request, kept a minute for
2277	/// the rest of it.
2278	async fn held(&self, repo: &Repo) -> u64 {
2279	let root = repo.fork_of.clone().unwrap_or_else(\|\| repo.id.clone());
2280	let now = now_ms();
2281	if let Some(held) = HELD.with(\|held\| held.borrow().get(&root, now)) {
2282	return held;
2283	}
2284	let held = self.registry.stored_bytes(&root).await.unwrap_or(0).max(0) as u64;
2285	HELD.with(\|kept\| kept.borrow_mut().put(root, held, now));
2286	held
2287	}
2288
2289	/// A `git.deleted` event for each branch or tag a push deleted that is
2290	/// gone from the store: the store can refuse one ref and accept
2291	/// another. As many as a push announces of tags and branches it moves.
2292	async fn publish_deleted(
2293	&self,
2294	repo: &Repo,
2295	deleted: &[(String, String)],
2296	actor: Option<&str>,
2297	caused_by_job: Option<&str>,
2298	) -> Result<()> {
2299	let stored = self.store.open(&store_key(repo)).await?;
2300	let is_branch = \|git_ref: &str\| git_ref.starts_with("refs/heads/");
2301	let tags = deleted.iter().filter(\|(git_ref, _)\| !is_branch(git_ref)).count();
2302	let announced = deleted
2303	.iter()
2304	.filter(\|(git_ref, _)\| is_branch(git_ref))
2305	.take(MAX_PUSH_BRANCH_EVENTS)
2306	.chain(deleted.iter().filter(\|(git_ref, _)\| !is_branch(git_ref) && tags <= MAX_PUSH_TAG_EVENTS));
2307	for (git_ref, before) in announced {
2308	let named = git_ref.strip_prefix("refs/heads/").unwrap_or(git_ref);
2309	let gone = match stored.log(named, 1).await {
2310	Ok(head) => head.is_empty(),
2311	Err(error) => {
2312	worker::console_error!("whether {git_ref} of {} was deleted is not known: {error}", repo.name);
2313	false
2314	}
2315	};
2316	if !gone {
2317	continue;
2318	}
2319	self.publish(NewEvent {
2320	kind: "git.deleted",
2321	source: SOURCE,
2322	repo_id: Some(repo.id.clone()),
2323	actor: actor.map(str::to_owned),
2324	data: GitDeleted {
2325	repo_id: repo.id.clone(),
2326	git_ref: git_ref.clone(),
2327	before: before.clone(),
2328	caused_by_job: caused_by_job.map(str::to_owned),
2329	},
2330	})
2331	.await?;
2332	}
2333	Ok(())
2334	}
2335
2336	/// What a push changed, recorded once git has its answer.
2337	async fn record_push(&self, push: PushDone) -> Result<()> {
2338	let PushDone {
2339	repo,
2340	pushed,
2341	deleted,
2342	pack_bytes,
2343	actor,
2344	unscanned,
2345	caused_by_job,
2346	credit,
2347	} = push;
2348	// What the push stored, for billing's storage meter. A failure only
2349	// leaves the count short.
2350	if pack_bytes > 0
2351	&& let Err(error) = self.registry.add_stored_bytes(&repo, pack_bytes).await
2352	{
2353	worker::console_error!("stored bytes for {} not counted: {error}", repo.name);
2354	}
2355	if !deleted.is_empty() {
2356	self.publish_deleted(&repo, &deleted, actor.as_deref(), caused_by_job.as_deref()).await?;
2357	}
2358	if pushed.is_empty() {
2359	return Ok(());
2360	}
2361	// Artifacts' own push notifications are per repository, which does
2362	// not fit a repo per pull request, so the front end reports pushes
2363	// itself: one event for each branch that moved.
2364	let stored = self.store.open(&store_key(&repo)).await?;
2365	let announced = announced_refs(&pushed, &repo.default_branch);
2366	if announced.len() < pushed.len() {
2367	worker::console_log!(
2368	"push to {}: {} of {} refs announced",
2369	repo.name,
2370	announced.len(),
2371	pushed.len()
2372	);
2373	}
2374	for pushed in announced {
2375	// The store can refuse one ref and accept another, so each
2376	// branch is checked against where it actually is. A tag the
2377	// store cannot read back is taken as pushed.
2378	let moved = match pushed.branch() {
2379	Some(branch) => stored
2380	.log(branch, 1)
2381	.await?
2382	.first()
2383	.is_some_and(\|commit\| commit.hash == pushed.after),
2384	None => stored.log(&pushed.git_ref, 1).await.map_or(true, \|head\| {
2385	head.first().is_none_or(\|commit\| commit.hash == pushed.after)
2386	}),
2387	};
2388	// How many commits a branch push brought (push_commits.rs), for
2389	// the event and the person's contribution calendar. A log the
2390	// store cannot read leaves the event without a count and the
2391	// day short.
2392	let commits = match (moved, pushed.branch()) {
2393	(true, Some(_)) => match stored.log(&pushed.after, push_commits::MOST_PER_PUSH + 1).await {
2394	Ok(log) => Some(push_commits::new_commits(&log, pushed.before.as_deref())),
2395	Err(error) => {
2396	worker::console_error!("commits pushed to {} not counted: {error}", repo.name);
2397	None
2398	}
2399	},
2400	_ => None,
2401	};
2402	if let (Some(commits), Some(user_id), Some(branch)) = (commits, credit.as_deref(), pushed.branch())
2403	&& push_commits::counts(branch, &repo.default_branch)
2404	&& let Err(error) =
2405	push_commits::record(&self.registry.db, user_id, &repo.id, &rfc3339(now_ms())[..10], commits).await
2406	{
2407	worker::console_error!("commits pushed to {} not credited: {error}", repo.name);
2408	}
2409	if moved {
2410	self.publish_git_push(
2411	&repo,
2412	&pushed.git_ref,
2413	pushed.before.as_deref(),
2414	&pushed.after,
2415	actor.clone(),
2416	unscanned,
2417	caused_by_job.clone(),
2418	commits,
2419	)
2420	.await?;
2421	}
2422	}
2423	Ok(())
2424	}
2425	}
2426
2427	/// The most tags one push announces: a push of more (`git push --tags`
2428	/// into a new repository, say) announces none of them, so it starts no
2429	/// workflows or package reads, one per tag.
2430	const MAX_PUSH_TAG_EVENTS: usize = 3;
2431	/// The most branches one push announces. A push of more announces only
2432	/// the default branch, if it moved, which the rest of g1t reads from.
2433	const MAX_PUSH_BRANCH_EVENTS: usize = 1000;
2434
2435	/// The refs of a push that are announced with a `git.push` event each.
2436	/// Every ref is stored whatever this says; only the events are capped.
2437	fn announced_refs<'a>(pushed: &'a [git_http::Pushed], default_branch: &str) -> Vec<&'a git_http::Pushed> {
2438	let (branches, tags): (Vec<&git_http::Pushed>, Vec<&git_http::Pushed>) =
2439	pushed.iter().partition(\|pushed\| pushed.branch().is_some());
2440	let mut announced = if branches.len() > MAX_PUSH_BRANCH_EVENTS {
2441	branches.into_iter().filter(\|pushed\| pushed.branch() == Some(default_branch)).collect()
2442	} else {
2443	branches
2444	};
2445	if tags.len() <= MAX_PUSH_TAG_EVENTS {
2446	announced.extend(tags);
2447	}
2448	announced
2449	}
2450
2451	/// A push the store accepted, to be recorded once git has its answer.
2452	struct PushDone {
2453	repo: Repo,
2454	pushed: Vec<git_http::Pushed>,
2455	/// The branches and tags it asked to delete, each with the commit it
2456	/// pointed to.
2457	deleted: Vec<(String, String)>,
2458	pack_bytes: u64,
2459	actor: Option<String>,
2460	/// Too large to scan for secrets before it was stored.
2461	unscanned: bool,
2462	/// The run whose job's token pushed, if one did: its push starts no
2463	/// workflows.
2464	caused_by_job: Option<String>,
2465	/// The person credited with the push's commits on their contribution
2466	/// calendar: whoever pushed, when that is a person (push_commits.rs).
2467	credit: Option<String>,
2468	}
2469
2470	/// What a git request leaves for after its answer: its audit entry, with
2471	/// how the request ended, and what a push changed.
2472	struct AfterGit {
2473	audit: Option<Box<g1t_contracts::audit::NewAuditEntry>>,
2474	status: u16,
2475	message: Option<String>,
2476	push: Option<PushDone>,
2477	}
2478
2479	impl AfterGit {
2480	fn ended(&mut self, status: u16, message: Option<String>) {
2481	self.status = status;
2482	self.message = message;
2483	}
2484
2485	/// Does the work once the response is on its way. A failure is logged:
2486	/// git has already been told how its request went.
2487	fn spawn(self, env: &Env, ctx: &Context) {
2488	if self.audit.is_none() && self.push.is_none() {
2489	return;
2490	}
2491	let env = env.clone();
2492	ctx.wait_until(async move {
2493	let repos = match service(&env) {
2494	Ok(repos) => repos,
2495	Err(error) => {
2496	worker::console_error!("git request not recorded: {error}");
2497	return;
2498	}
2499	};
2500	repos.finish_git(self.audit, self.status, self.message).await;
2501	if let Some(push) = self.push
2502	&& let Err(error) = repos.record_push(push).await
2503	{
2504	worker::console_error!("push not recorded: {error}");
2505	}
2506	repos.deferred.settle().await;
2507	});
2508	}
2509	}
2510
2511	fn service(env: &Env) -> Result<Repos<ArtifactsStore>> {
2512	let shared = shared::Shared::from_env(env).map(Rc::new);
2513	let deferred = Rc::new(store::Deferred::default());
2514	Ok(Repos {
2515	registry: Registry { db: env.d1("DB")? },
2516	store: ArtifactsStore::new(env, shared.clone(), deferred.clone())?,
2517	deferred,
2518	shared,
2519	packs: pack_cache::Packs::from_env(env).map(Rc::new),
2520	events: env.service("EVENTS")?,
2521	security: env.service("SECURITY").ok(),
2522	billing: env.service("BILLING").ok(),
2523	identity: env.service("IDENTITY").ok(),
2524	work: env.service("WORK").ok(),
2525	free_private_bytes: git_ops::free_private_bytes(env),
2526	fork_days: forks::retention_days(env),
2527	repo_limit: env
2528	.var("REPO_STORAGE_LIMIT_BYTES")
2529	.ok()
2530	.and_then(\|value\| value.to_string().parse().ok())
2531	.unwrap_or(pack_limits::DEFAULT_REPO_LIMIT_BYTES),
2532	large_pushes: git_http::LargePushes::from_var(env.var("LARGE_PUSHES").ok().map(\|value\| value.to_string()).as_deref()),
2533	placement: shards::Placement::from_vars(
2534	env.var("GITSTORE_NEW_REPOS").ok().map(\|value\| value.to_string()).as_deref(),
2535	env.var("GITSTORE_EU_NAMESPACE").ok().map(\|value\| value.to_string()).as_deref(),
2536	),
2537	limits: shards::limits(env.var("GITSTORE_NAMESPACE_LIMITS").ok().map(\|value\| value.to_string()).as_deref()),
2538	})
2539	}
2540
2541	/// Writes what this isolate metered once the answer has gone back, every
2542	/// few seconds at most: now, or once it is due, waiting in this request's
2543	/// `wait_until` so nothing counted is left for a request that may never
2544	/// come (meters.rs).
2545	fn flush_later(env: &Env, ctx: &Context) {
2546	let Some(wait) = meters::plan_flush() else {
2547	return;
2548	};
2549	if let Ok(db) = env.d1("DB") {
2550	ctx.wait_until(async move { meters::flush_after(&db, wait).await });
2551	}
2552	}
2553
2554	/// `/backups/<job id>/parts/<number>`: the job and the part's number.
2555	fn backup_part_path(path: &str) -> Option<(String, u16)> {
2556	let rest = path.strip_prefix("/backups/")?;
2557	let (job, number) = rest.split_once("/parts/")?;
2558	let number = number.parse::<u16>().ok()?;
2559	(!job.is_empty() && !job.contains('/')).then(\|\| (job.to_owned(), number))
2560	}
2561
2562	fn backups_off<T>() -> Outcome<T> {
2563	Outcome::fail(FailureCode::Conflict, "Backups are off on this installation: it has no storage for them.")
2564	}
2565
2566	/// One part of a backup's bundle, with the job's token in its header.
2567	async fn backup_part(request: &mut Request, env: &Env, repos: &Repos<ArtifactsStore>, job_id: String, number: u16) -> Result<Response> {
2568	let Some(blobs) = backups::storage(env) else {
2569	return reply(&backups_off::<()>());
2570	};
2571	let token = request.headers().get(g1t_contracts::backups::TOKEN_HEADER)?.unwrap_or_default();
2572	let bytes = request.bytes().await?;
2573	let job = g1t_contracts::backups::BackupJobArgs { job_id, token };
2574	reply(&backups::part(&repos.registry.db, &blobs, &job, number, bytes).await?)
2575	}
2576
2577	#[cfg(test)]
2578	mod backup_path_tests {
2579	use super::backup_part_path;
2580
2581	#[test]
2582	fn a_part_is_named_by_its_job_and_number() {
2583	assert_eq!(backup_part_path("/backups/bkp_1/parts/3"), Some(("bkp_1".to_owned(), 3)));
2584	assert_eq!(backup_part_path("/backups/bkp_1/parts/x"), None);
2585	assert_eq!(backup_part_path("/backups//parts/1"), None);
2586	assert_eq!(backup_part_path("/acme/rocket.git/info/refs"), None);
2587	}
2588	}
2589
2590	/// Read methods whose answer is an `Outcome`: when the git store is busy,
2591	/// the site is told so in words instead of failing the page.
2592	const OUTCOME_READS: [&str; 7] = ["tree", "blob", "log", "branches", "blame", "compare", "branch_drift"];
2593
2594	#[event(fetch)]
2595	async fn fetch(mut request: Request, env: Env, ctx: Context) -> Result<Response> {
2596	let mut repos = service(&env)?;
2597	// A part of a backup's bundle, as the API passes it on from the
2598	// sandbox: bytes, not JSON (backups.rs).
2599	if request.method() == Method::Put
2600	&& let Some((job_id, number)) = backup_part_path(&request.path())
2601	{
2602	let answered = backup_part(&mut request, &env, &repos, job_id, number).await;
2603	repos.deferred.hand_over(&ctx);
2604	flush_later(&env, &ctx);
2605	return answered;
2606	}
2607	let Some(method) = rpc_method(&request) else {
2608	let answered = repos.git_http(request, &env, &ctx).await;
2609	repos.deferred.hand_over(&ctx);
2610	flush_later(&env, &ctx);
2611	return answered;
2612	};
2613	// A replica near the caller when it asks for one (crates/kit/src/d1.rs).
2614	// Git over HTTPS above always reads the primary.
2615	let (db, served) = g1t_kit::d1::open(&env, "DB", &request)?;
2616	repos.registry.db = db;
2617	let body: serde_json::Value = request.json().await?;
2618
2619	let answered = async { match method.as_str() {
2620	"get" => reply(&repos.get(args(body)?).await?),
2621	"get_by_id" => reply(&repos.get_by_id(args(body)?).await?),
2622	"readable" => {
2623	let a: ReadableArgs = args(body)?;
2624	reply(&repos.registry.readable(&a.ids, &a.viewer).await?)
2625	}
2626	// Work's contribution calendar: the commits a person pushed each
2627	// day, in repositories the viewer may read (push_commits.rs).
2628	"commit_days" => {
2629	let a: g1t_contracts::repos::CommitDaysArgs = args(body)?;
2630	reply(&push_commits::days(&repos.registry, &a.user_id, &a.since, &a.viewer).await?)
2631	}
2632	"public_namespaces" => {
2633	let a: PublicNamespacesArgs = args(body)?;
2634	reply(&repos.registry.public_namespaces(&a.owner_id).await?)
2635	}
2636	"path_by_id" => {
2637	let a: PathByIdArgs = args(body)?;
2638	reply(
2639	&repos
2640	.registry
2641	.by_id(&a.id)
2642	.await?
2643	.filter(\|repo\| repo.fork_of.is_none())
2644	.map(\|repo\| RepoPath {
2645	namespace: repo.namespace,
2646	name: repo.name,
2647	}),
2648	)
2649	}
2650	"list" => {
2651	let a: ListArgs = args(body)?;
2652	reply(
2653	&repos
2654	.registry
2655	.list(
2656	&a.viewer,
2657	a.query.as_deref(),
2658	a.namespace.as_deref(),
2659	a.member_only,
2660	)
2661	.await?,
2662	)
2663	}
2664	"create" => reply(&repos.create(args(body)?).await?),
2665	"transfer" => reply(&repos.transfer(args(body)?).await?),
2666	// A repository's lifecycle: see lifecycle.rs.
2667	"delete" => reply(&repos.delete(args(body)?).await?),
2668	"deleted" => reply(&repos.deleted(args(body)?).await?),
2669	"restore" => reply(&repos.restore(args(body)?).await?),
2670	"purge" => reply(&repos.purge(args(body)?).await?),
2671	"purge_due" => reply(&repos.purge_due(args(body)?).await?),
2672	"rename" => reply(&repos.rename(args(body)?).await?),
2673	"archive" => reply(&repos.archive(args(body)?).await?),
2674	"set_visibility" => reply(&repos.set_visibility(args(body)?).await?),
2675	"set_default_branch" => reply(&repos.set_default_branch(args(body)?).await?),
2676	"rename_branch" => reply(&repos.rename_branch(args(body)?).await?),
2677	"create_branch" => reply(&repos.create_branch(args(body)?).await?),
2678	"remove_branch" => reply(&repos.remove_branch(args(body)?).await?),
2679	"resolve_branch" => reply(&repos.resolve_branch(args(body)?).await?),
2680	"status_by_id" => reply(&repos.status_by_id(args(body)?).await?),
2681	"resolve_path" => {
2682	let a: ResolvePathArgs = args(body)?;
2683	reply(&repos.registry.resolve_moved(&a.path).await?)
2684	}
2685	"namespace_count" => {
2686	let a: NamespaceCountArgs = args(body)?;
2687	reply(&repos.registry.count_in(&a.namespace).await?)
2688	}
2689	"update" => reply(&repos.update(args(body)?).await?),
2690	"tree" => reply(&repos.tree(args(body)?).await?),
2691	"blob" => reply(&repos.blob(args(body)?).await?),
2692	"log" => reply(&repos.log(args(body)?).await?),
2693	"blame" => reply(&repos.blame(args(body)?).await?),
2694	"fork_for_pull" => reply(&repos.fork_for_pull(args(body)?).await?),
2695	"git_access" => reply(&repos.git_access(args(body)?).await?),
2696	"branches" => reply(&repos.branches(args(body)?).await?),
2697	"last_commits" => reply(&repos.last_commits(args(body)?).await?),
2698	"path_log" => reply(&repos.path_log(args(body)?).await?),
2699	"branch_drift" => reply(&repos.branch_drift(args(body)?).await?),
2700	"tags" => reply(&repos.tags(args(body)?).await?),
2701	// The About: what the Files page shows beside the files (about.rs).
2702	// What is kept behind the head is worked out again after the answer.
2703	"about" => {
2704	let (answer, refresh) = repos.about(args(body)?).await?;
2705	about::refresh_later(&env, &ctx, refresh);
2706	reply(&answer)
2707	}
2708	"languages" => {
2709	let (answer, refresh) = repos.languages(args(body)?).await?;
2710	about::refresh_later(&env, &ctx, refresh);
2711	reply(&answer)
2712	}
2713	"contributors" => {
2714	let (answer, refresh) = repos.contributors(args(body)?).await?;
2715	about::refresh_later(&env, &ctx, refresh);
2716	reply(&answer)
2717	}
2718	"license" => {
2719	let (answer, refresh) = repos.license(args(body)?).await?;
2720	about::refresh_later(&env, &ctx, refresh);
2721	reply(&answer)
2722	}
2723	"stars" => reply(&repos.stars(args(body)?).await?),
2724	"star" => reply(&repos.star(args(body)?).await?),
2725	"stargazers" => reply(&repos.stargazers(args(body)?).await?),
2726	"starred" => reply(&repos.starred(args(body)?).await?),
2727	"releases" => reply(&repos.releases(args(body)?).await?),
2728	"release" => reply(&repos.release(args(body)?).await?),
2729	"create_release" => reply(&repos.create_release(args(body)?).await?),
2730	"update_release" => reply(&repos.update_release(args(body)?).await?),
2731	"delete_release" => reply(&repos.delete_release(args(body)?).await?),
2732	"head" => reply(&repos.head(args(body)?).await?),
2733	"behind" => reply(&repos.behind(args(body)?).await?),
2734	"divergence" => reply(&repos.divergence(args(body)?).await?),
2735	"land" => reply(&repos.land(args(body)?).await?),
2736	"update_pull_branch" => reply(&repos.update_pull_branch(args(body)?).await?),
2737	// Services only: a pull request's test merge commit (test_merge.rs).
2738	"pull_merge_ref" => reply(&repos.pull_merge_ref(args(body)?).await?),
2739	"delete_branch" => reply(&repos.delete_branch(args(body)?).await?),
2740	"commit_file" => reply(&repos.commit_file(args(body)?).await?),
2741	"compare" => reply(&repos.compare(args(body)?).await?),
2742	// Services only: a pull request's commits, as rules look at them (rules.rs).
2743	"inspect_commits" => reply(&repos.inspect_commits(args(body)?).await?),
2744	"scan_history" => reply(&repos.scan_history(args(body)?).await?),
2745	"find_lockfiles" => reply(&repos.find_lockfiles(args(body)?).await?),
2746	"match_pattern" => reply(&repos.match_pattern(args(body)?).await?),
2747	"check_secret" => reply(&repos.check_secret(args(body)?).await?),
2748	"list_files" => reply(&repos.list_files(args(body)?).await?),
2749	// The API's tarball and zipball links, and the site opening them (archive_links.rs).
2750	"archive_link" => {
2751	let sealer = env.secret("REPOS_KEY").ok().and_then(\|key\| g1t_secrets::Sealer::new(&key.to_string()));
2752	reply(&repos.archive_link(args(body)?, sealer.as_ref()).await?)
2753	}
2754	"open_archive_token" => {
2755	let sealer = env.secret("REPOS_KEY").ok().and_then(\|key\| g1t_secrets::Sealer::new(&key.to_string()));
2756	reply(&repos.open_archive_token(args(body)?, sealer.as_ref()).await?)
2757	}
2758	"changed_files" => reply(&repos.changed_files(args(body)?).await?),
2759	"read_blobs" => reply(&repos.read_blobs(args(body)?).await?),
2760	// Services only: what the Composer registry builds packages from.
2761	"refs" => reply(&repos.refs_of(args(body)?).await?),
2762	"raw_file" => reply(&repos.raw_file(args(body)?).await?),
2763	"raw_blobs" => reply(&repos.raw_blobs(args(body)?).await?),
2764	"visibility" => {
2765	let a: g1t_contracts::repos::VisibilityArgs = args(body)?;
2766	reply(&repos.registry.visibility(&a.paths).await?)
2767	}
2768	"storage" => reply(&repos.registry.storage().await?),
2769	"git_operations" => {
2770	let a: GitOperationsArgs = args(body)?;
2771	reply(&git_ops::totals(&repos.registry.db, &a.month, a.since.as_deref(), a.namespace.as_deref().map(str::to_lowercase).as_deref()).await?)
2772	}
2773	// Identity, once: who created each repository (members.rs there).
2774	"repo_creators" => {
2775	let a: AllIdsArgs = args(body)?;
2776	let limit = a.limit.clamp(1, 500);
2777	let repos = repos.registry.creators_after(a.after.as_deref(), limit).await?;
2778	let next = (repos.len() == limit as usize).then(\|\| repos.last().map(\|repo\| repo.id.clone())).flatten();
2779	reply(&CreatorPage { repos, next })
2780	}
2781	"all_ids" => {
2782	let a: AllIdsArgs = args(body)?;
2783	let limit = a.limit.clamp(1, 500);
2784	let ids = repos.registry.ids_after(a.after.as_deref(), limit).await?;
2785	let next = (ids.len() == limit as usize).then(\|\| ids.last().cloned()).flatten();
2786	reply(&IdPage { ids, next })
2787	}
2788	// The raw meters of the git store, for reconciling with Cloudflare
2789	// (meters.rs, scripts/ops/gitstore-usage.mjs).
2790	"artifacts_usage" => {
2791	let a: meters::UsageArgs = args(body)?;
2792	reply(&meters::usage(&repos.registry.db, &a).await?)
2793	}
2794	"operation_mapping" => reply(&meters::read_mapping(&repos.registry.db).await?),
2795	// Billing: the workspace each pull request's working copy is counted
2796	// for, so Cloudflare's own count of `pulls--<id>` shares out too.
2797	"pull_owners" => {
2798	#[derive(serde::Deserialize)]
2799	struct PullOwnersArgs {
2800	pulls: Vec<String>,
2801	}
2802	let a: PullOwnersArgs = args(body)?;
2803	let pulls: Vec<String> = a.pulls.into_iter().take(500).collect();
2804	reply(&serde_json::json!({ "owners": meters::pull_owners(&repos.registry.db, &pulls).await? }))
2805	}
2806	// Services only: which meters are operations, changed without a deploy.
2807	"set_operation_mapping" => {
2808	let row: meters::MappingRow = args(body)?;
2809	meters::set_mapping(&repos.registry.db, &row, &rfc3339(now_ms())).await?;
2810	reply(&meters::read_mapping(&repos.registry.db).await?)
2811	}
2812	// Backups (backups.rs): the runner's sweep claims queued ones, and
2813	// each sandbox, through the API, asks for its job and says how it went.
2814	"claim_backups" => {
2815	let a: g1t_contracts::backups::ClaimBackupsArgs = args(body)?;
2816	let blobs = backups::storage(&env);
2817	reply(&backups::claim(&repos.registry.db, blobs.as_ref(), &a, now_ms()).await?)
2818	}
2819	"backup_spec" => match backups::storage(&env) {
2820	Some(blobs) => {
2821	let a: g1t_contracts::backups::BackupJobArgs = args(body)?;
2822	let every = backups::Settings::from_env(&env).full_every;
2823	reply(&backups::spec(&repos.registry, &blobs, &repos.store, &a, every, now_ms()).await?)
2824	}
2825	None => reply(&backups_off::<bool>()),
2826	},
2827	"backup_complete" => match backups::storage(&env) {
2828	Some(blobs) => reply(&backups::complete(&repos.registry, &blobs, &args(body)?, now_ms()).await?),
2829	None => reply(&backups_off::<bool>()),
2830	},
2831	"backup_fail" => match backups::storage(&env) {
2832	Some(blobs) => reply(&backups::fail(&repos.registry.db, &blobs, &args(body)?).await?),
2833	None => reply(&backups_off::<bool>()),
2834	},
2835	// How the git store has been answering, for the status page.
2836	"store_health" => {
2837	let a: meters::HealthArgs = args(body)?;
2838	reply(&meters::health(&repos.registry.db, &a).await?)
2839	}
2840	// Where repositories may be kept, for a workspace's settings.
2841	"storage_options" => reply(&repos.storage_options()),
2842	// Services and operators only: how each namespace stands, and
2843	// moving a repository between them (namespaces.rs, moves.rs).
2844	"namespaces" => reply(&repos.standings().await?),
2845	"move_repository" => reply(&repos.move_repository(args(body)?).await?),
2846	"repository_moves" => {
2847	let a: moves::ListMovesArgs = args(body)?;
2848	reply(&repos.registry.moves(a.limit.unwrap_or(50)).await?)
2849	}
2850	_ => Response::error("Unknown method", 404),
2851	} }
2852	.await;
2853	// The git store is busy: said in words, with when to try again.
2854	let answered = match answered {
2855	Err(error) => match resilience::busy(&error.to_string()) {
2856	Some(busy) if OUTCOME_READS.contains(&method.as_str()) => {
2857	reply(&Outcome::<()>::fail(FailureCode::Conflict, busy.message().trim()))
2858	}
2859	Some(busy) => {
2860	let response = Response::error(busy.message(), 503)?;
2861	response.headers().set("retry-after", &busy.retry_after.to_string())?;
2862	Ok(response)
2863	}
2864	None => Err(error),
2865	},
2866	answered => answered,
2867	};
2868	repos.deferred.hand_over(&ctx);
2869	flush_later(&env, &ctx);
2870	served.finish(answered)
2871	}
2872
2873	/// The nightly cron in wrangler.jsonc: tonight's backups are queued.
2874	const BACKUP_CRON: &str = "53 2 * * *";
2875
2876	/// The hourly sweep: deleted repositories whose time to be restored has
2877	/// passed are purged. See lifecycle.rs. And, at [`BACKUP_CRON`], the
2878	/// repositories whose refs moved are queued for a backup (backups.rs).
2879	#[event(scheduled)]
2880	async fn scheduled(event: ScheduledEvent, env: Env, _ctx: ScheduleContext) {
2881	let repos = match service(&env) {
2882	Ok(repos) => repos,
2883	Err(error) => {
2884	worker::console_error!("repos: the sweep could not start: {error}");
2885	return;
2886	}
2887	};
2888	if event.cron() == BACKUP_CRON {
2889	let Some(blobs) = backups::storage(&env) else { return };
2890	match backups::nightly(&repos.registry.db, &blobs, backups::Settings::from_env(&env), now_ms()).await {
2891	Ok(night) => worker::console_log!("repos: queued {} backups, removed {} of purged repositories", night.queued, night.pruned),
2892	Err(error) => worker::console_error!("repos: backups could not be queued: {error}"),
2893	}
2894	return;
2895	}
2896	match repos.purge_due(PurgeDueArgs::default()).await {
2897	Ok(0) => {}
2898	Ok(count) => worker::console_log!("repos: purged {count} deleted repositories"),
2899	Err(error) => worker::console_error!("repos: the purge sweep failed: {error}"),
2900	}
2901	// Pull requests' working copies whose time has come (forks.rs).
2902	match repos.retire_due().await {
2903	Ok(0) => {}
2904	Ok(count) => worker::console_log!("repos: removed {count} pull request working copies"),
2905	Err(error) => worker::console_error!("repos: the working copy sweep failed: {error}"),
2906	}
2907	// Repositories moving between namespaces, and old copies (moves.rs).
2908	match repos.run_moves().await {
2909	Ok(0) => {}
2910	Ok(count) => worker::console_log!("repos: moved {count} repositories between namespaces"),
2911	Err(error) => worker::console_error!("repos: the move sweep failed: {error}"),
2912	}
2913	meters::flush(&repos.registry.db).await;
2914	}
2915
2916	/// Events from the bus. A workspace's rename: its repositories move to the
2917	/// workspace's current slug, asked of identity by id, so a repeated or late
2918	/// delivery lands in the same place; their git store keys stay as they
2919	/// were. A workspace's deletion: its repositories are deleted with it,
2920	/// restored with it, or purged with it.
2921	#[event(queue)]
2922	async fn queue(batch: MessageBatch<Event>, env: Env, ctx: Context) -> Result<()> {
2923	let registry = Registry { db: env.d1("DB")? };
2924	let identity = env.service("IDENTITY")?;
2925	let handled = handle_events(&batch, &env, &registry, &identity).await;
2926	flush_later(&env, &ctx);
2927	handled
2928	}
2929
2930	/// Each event is acknowledged or retried on its own, so one that fails is
2931	/// tried again without the others before and after it running twice.
2932	async fn handle_events(batch: &MessageBatch<Event>, env: &Env, registry: &Registry, identity: &Fetcher) -> Result<()> {
2933	for message in batch.messages()? {
2934	match handle_event(message.body(), env, registry, identity).await {
2935	Ok(()) => message.ack(),
2936	Err(error) => {
2937	worker::console_error!("repos: event {} failed: {error}", message.body().id);
2938	message.retry();
2939	}
2940	}
2941	}
2942	Ok(())
2943	}
2944
2945	async fn handle_event(event: &Event, env: &Env, registry: &Registry, identity: &Fetcher) -> Result<()> {
2946	// A pull request merged, closed or reopened: its working copy is
2947	// kept or let go (forks.rs).
2948	if let Some(change) = forks::pull_change(&event.kind) {
2949	let Some(pull_id) = forks::pull_id_of(&event.data) else {
2950	worker::console_error!("{} {} names no pull request", event.kind, event.id);
2951	return Ok(());
2952	};
2953	let repos = service(env)?;
2954	match change {
2955	forks::PullChange::Settled => repos.pull_settled(&pull_id).await?,
2956	forks::PullChange::Reopened => repos.pull_reopened(&pull_id).await?,
2957	}
2958	return Ok(());
2959	}
2960	// A workspace deleted, restored or purged: its repositories go with
2961	// it, come back with it, or are purged with it (lifecycle.rs).
2962	if event.kind == "workspace.deleting" {
2963	match serde_json::from_value::<WorkspaceDeleting>(event.data.clone()) {
2964	Ok(deleting) => service(env)?.delete_with_workspace(&deleting, &protected_workspaces(env)).await?,
2965	Err(_) => worker::console_error!("workspace.deleting {} could not be read", event.id),
2966	}
2967	return Ok(());
2968	}
2969	if event.kind == "workspace.restored" {
2970	match serde_json::from_value::<WorkspaceRestored>(event.data.clone()) {
2971	Ok(restored) => service(env)?.restore_with_workspace(&restored).await?,
2972	Err(_) => worker::console_error!("workspace.restored {} could not be read", event.id),
2973	}
2974	return Ok(());
2975	}
2976	if event.kind == "workspace.deleted" {
2977	match serde_json::from_value::<WorkspaceDeleted>(event.data.clone()) {
2978	Ok(deleted) => service(env)?.purge_workspace(&deleted, &protected_workspaces(env)).await?,
2979	Err(_) => worker::console_error!("workspace.deleted {} could not be read", event.id),
2980	}
2981	return Ok(());
2982	}
2983	// An account deleted or restored: kept contributors that name it
2984	// (or ghost, for a restore) are worked out again, so it shows as
2985	// ghost for its 30 days, and as itself again if restored.
2986	if let Some(needle) = stats::shown_differently(&event.kind, &event.data) {
2987	let db = env.d1("DB")?;
2988	if let Err(error) = stats::rework_naming(&db, &needle).await {
2989	worker::console_error!("{} {}: contributors not marked to be counted again: {error}", event.kind, event.id);
2990	}
2991	return Ok(());
2992	}
2993	if event.kind != "workspace.renamed" {
2994	return Ok(());
2995	}
2996	let Ok(renamed) = serde_json::from_value::<WorkspaceRenamed>(event.data.clone()) else {
2997	worker::console_error!("workspace.renamed {} could not be read", event.id);
2998	return Ok(());
2999	};
3000	let names: HashMap<String, String> = g1t_kit::call(
3001	identity,
3002	"usernames",
3003	&g1t_contracts::identity::UsernamesArgs {
3004	ids: vec![renamed.workspace_id.clone()],
3005	},
3006	)
3007	.await?;
3008	let current = names
3009	.get(&renamed.workspace_id)
3010	.cloned()
3011	.unwrap_or_else(\|\| renamed.to.clone());
3012	let left = registry
3013	.rename_namespace(&renamed.stale_slugs(&current), &current)
3014	.await?;
3015	if left > 0 {
3016	worker::console_error!(
3017	"{left} repositories stayed under {} or {}: {current} already has repositories of the same names",
3018	renamed.from,
3019	renamed.to
3020	);
3021	}
3022	Ok(())
3023	}
3024
3025	/// The workspaces whose repositories never go with a deletion, whatever is
3026	/// published: `PROTECTED_WORKSPACES` if set here, and Flagon's always.
3027	fn protected_workspaces(env: &Env) -> Vec<String> {
3028	let configured = env.var("PROTECTED_WORKSPACES").ok().map(\|v\| v.to_string());
3029	g1t_contracts::identity::protected_names(configured.as_deref())
3030	}
3031
3032	/// What a token's own limits say about git on the repository `repo`
3033	/// (`owner/name`), before anyone's role is asked: why it is refused, or
3034	/// `None`. `source` is the repository a pull request's working copy at
3035	/// `repo` belongs to, which a workflow job's token reaches too. `public`
3036	/// is whether anyone may read it, and `exists` whether there is one.
3037	///
3038	/// A job's token and a deploy key reach their own repository only. Its
3039	/// scopes decide the rest: `code:read` to read a private repository,
3040	/// `code:write` to push, which a read-only deploy key never has. A deploy
3041	/// key never makes a repository by pushing to an empty address.
3042	pub(crate) fn git_token_refusal(
3043	access: &g1t_contracts::scopes::TokenAccess,
3044	repo: &str,
3045	source: Option<&str>,
3046	write: bool,
3047	public: bool,
3048	exists: bool,
3049	) -> Option<String> {
3050	if let Some(refused) = g1t_contracts::scopes::decide_repo(access, repo)
3051	&& !source.is_some_and(\|source\| access.reaches(source))
3052	{
3053	return Some(refused.reason.unwrap_or_default());
3054	}
3055	let decision = g1t_contracts::scopes::decide_git(access, write, public);
3056	if !decision.allowed {
3057	return Some(decision.reason.unwrap_or_default());
3058	}
3059	if access.deploy_key.is_some() && !exists {
3060	return Some(format!("This deploy key is for {repo}, which is not there any more."));
3061	}
3062	None
3063	}
3064
3065	/// The repository a push to a path that does not exist yet creates: private,
3066	/// so nothing pushed by mistake is published. An owner makes it public on
3067	/// purpose (`POST /repos/{owner}/{repo}/visibility`).
3068	fn push_to_create(owner: &User, path: &RepoPath) -> CreateArgs {
3069	CreateArgs {
3070	owner: owner.clone(),
3071	namespace: path.namespace.clone(),
3072	name: path.name.clone(),
3073	description: None,
3074	is_private: true,
3075	import_url: None,
3076	import_token: None,
3077	}
3078	}
3079
3080	/// Whether `delete_branch` may remove `branch`: one of g1t's own
3081	/// (`g1t-…`), or one whose tip the caller names, such as a dependency
3082	/// update's branch after its pull request closed.
3083	fn deletable_branch(branch: &str, head: Option<&str>) -> bool {
3084	!branch.is_empty() && (branch.starts_with(G1T_BRANCH_PREFIX) \|\| head.is_some_and(\|head\| !head.is_empty()))
3085	}
3086
3087	#[cfg(test)]
3088	mod delete_branch_tests {
3089	use super::deletable_branch;
3090
3091	#[test]
3092	fn only_g1t_branches_or_a_named_tip_are_deleted() {
3093	assert!(deletable_branch("g1t-queue-12", None));
3094	assert!(!deletable_branch("g1t/security/sharp-0.35.5", None));
3095	assert!(deletable_branch("g1t/security/sharp-0.35.5", Some("abc123")));
3096	assert!(!deletable_branch("feature", Some("")));
3097	assert!(!deletable_branch("", Some("abc123")));
3098	}
3099	}
3100
3101	#[cfg(test)]
3102	mod announced_refs_tests {
3103	use super::*;
3104
3105	fn pushed(git_ref: String) -> git_http::Pushed {
3106	git_http::Pushed { git_ref, before: None, after: "abc".into() }
3107	}
3108
3109	fn refs(announced: Vec<&git_http::Pushed>) -> Vec<&str> {
3110	announced.into_iter().map(\|pushed\| pushed.git_ref.as_str()).collect()
3111	}
3112
3113	#[test]
3114	fn a_few_tags_are_announced_and_many_are_not() {
3115	let few: Vec<_> = (1..=3).map(\|n\| pushed(format!("refs/tags/v{n}"))).chain([pushed("refs/heads/main".into())]).collect();
3116	assert_eq!(refs(announced_refs(&few, "main")), ["refs/heads/main", "refs/tags/v1", "refs/tags/v2", "refs/tags/v3"]);
3117	let many: Vec<_> = (1..=10_000).map(\|n\| pushed(format!("refs/tags/v{n}"))).chain([pushed("refs/heads/main".into())]).collect();
3118	assert_eq!(refs(announced_refs(&many, "main")), ["refs/heads/main"]);
3119	}
3120
3121	#[test]
3122	fn past_the_branch_cap_only_the_default_branch_is_announced() {
3123	let at_cap: Vec<_> = (0..MAX_PUSH_BRANCH_EVENTS).map(\|n\| pushed(format!("refs/heads/b{n}"))).collect();
3124	assert_eq!(announced_refs(&at_cap, "main").len(), MAX_PUSH_BRANCH_EVENTS);
3125	let over: Vec<_> = (0..=MAX_PUSH_BRANCH_EVENTS)
3126	.map(\|n\| pushed(format!("refs/heads/b{n}")))
3127	.chain([pushed("refs/heads/main".into())])
3128	.collect();
3129	assert_eq!(refs(announced_refs(&over, "main")), ["refs/heads/main"]);
3130	assert!(announced_refs(&over, "trunk").is_empty());
3131	}
3132	}
3133
3134	#[cfg(test)]
3135	mod push_to_create_tests {
3136	use super::*;
3137
3138	#[test]
3139	fn a_pushed_repository_starts_private() {
3140	let owner: User = serde_json::from_value(serde_json::json!({ "id": "usr_1", "username": "ada" })).unwrap();
3141	let args = push_to_create(&owner, &RepoPath { namespace: "acme".into(), name: "site".into() });
3142	assert!(args.is_private);
3143	assert_eq!((args.namespace.as_str(), args.name.as_str()), ("acme", "site"));
3144	}
3145	}
3146
3147	#[cfg(test)]
3148	mod deploy_key_git_tests {
3149	use super::*;
3150	use g1t_contracts::deploy_keys;
3151
3152	fn key(read_only: bool) -> User {
3153	deploy_keys::principal("wsp_acme", "acme", deploy_keys::access("dk_1", "CI", "acme/rocket", read_only))
3154	}
3155
3156	fn rocket(private: bool) -> Repo {
3157	serde_json::from_value(serde_json::json!({
3158	"id": "rep_rocket",
3159	"namespace": "acme",
3160	"name": "rocket",
3161	"description": null,
3162	"isPrivate": private,
3163	"ownerId": "usr_owner",
3164	"defaultBranch": "main",
3165	"forkOf": null,
3166	"protected": false,
3167	"createdAt": "",
3168	}))
3169	.unwrap()
3170	}
3171
3172	fn refusal(user: &User, repo: &str, write: bool, exists: bool) -> Option<String> {
3173	git_token_refusal(user.token.as_deref().unwrap(), repo, None, write, false, exists)
3174	}
3175
3176	#[test]
3177	fn a_read_only_deploy_key_clones_its_repository_and_never_pushes() {
3178	let user = key(true);
3179	assert_eq!(refusal(&user, "acme/rocket", false, true), None);
3180	assert!(refusal(&user, "acme/rocket", true, true).unwrap().contains("read-only"));
3181	// Its role is a workspace token's: it reads a private repository.
3182	assert!(registry::can_read(&rocket(true), &Some(user)));
3183	}
3184
3185	#[test]
3186	fn a_deploy_key_with_write_access_pushes_to_its_repository() {
3187	let user = key(false);
3188	assert_eq!(refusal(&user, "acme/rocket", true, true), None);
3189	assert!(registry::can_write(&rocket(true), &Some(user)));
3190	}
3191
3192	#[test]
3193	fn a_deploy_key_reaches_no_other_repository() {
3194	let user = key(false);
3195	for other in ["acme/booster", "other/rocket"] {
3196	for write in [false, true] {
3197	let why = refusal(&user, other, write, true).expect(other);
3198	assert!(why.contains("deploy key is for acme/rocket"), "{why}");
3199	}
3200	}
3201	// Not even a pull request's working copy of another repository.
3202	let token = user.token.as_deref().unwrap();
3203	assert!(git_token_refusal(token, "pulls/pr_1", Some("acme/booster"), false, false, true).is_some());
3204	}
3205
3206	#[test]
3207	fn a_deploy_key_never_creates_a_repository() {
3208	let why = refusal(&key(false), "acme/rocket", true, false).unwrap();
3209	assert!(why.contains("not there"), "{why}");
3210	}
3211	}