| 1 | //! What `g1t-runner register` keeps: where g1t is, who this runner is, its |
| 2 | //! credential, and how it runs work. One JSON file in the runner's folder, |
| 3 | //! readable by its owner only. |
| 4 | |
| 5 | use std::path::{Path, PathBuf}; |
| 6 | |
| 7 | use anyhow::{Context, Result}; |
| 8 | use serde::{Deserialize, Serialize}; |
| 9 | |
| 10 | #[derive(Clone, Debug, Serialize, Deserialize)] |
| 11 | pub struct Config { |
| 12 | /// The site, as given to `--url`: `https://g1t.sh`. |
| 13 | pub url: String, |
| 14 | /// The API the runner calls: `https://api.g1t.sh`. |
| 15 | pub api: String, |
| 16 | /// The runner's id and name. |
| 17 | pub runner: String, |
| 18 | pub name: String, |
| 19 | /// Its credential (`g1tr_…`). Rotated by g1t every day. |
| 20 | pub credential: String, |
| 21 | pub workspace: String, |
| 22 | #[serde(default)] |
| 23 | pub repo: Option<String>, |
| 24 | #[serde(default)] |
| 25 | pub group: Option<String>, |
| 26 | pub labels: Vec<String>, |
| 27 | /// Runs one job, then removes itself. |
| 28 | #[serde(default)] |
| 29 | pub ephemeral: bool, |
| 30 | /// Where jobs keep their files when they run on this machine directly. |
| 31 | pub work_dir: PathBuf, |
| 32 | /// Runs work in Docker containers (the default), or directly. |
| 33 | #[serde(default = "yes")] |
| 34 | pub docker: bool, |
| 35 | /// The image workflow jobs run in when they name no `container:`. |
| 36 | #[serde(default)] |
| 37 | pub image: Option<String>, |
| 38 | /// The image agent work runs in: git, Node and the agent's CLI. |
| 39 | #[serde(default)] |
| 40 | pub agent_image: Option<String>, |
| 41 | /// A Linux build of `g1t-runner` to run inside containers, instead of |
| 42 | /// this binary (on Linux) or the release's (elsewhere). |
| 43 | #[serde(default)] |
| 44 | pub harness: Option<PathBuf>, |
| 45 | /// Checks for new versions and updates itself. |
| 46 | #[serde(default = "yes")] |
| 47 | pub auto_update: bool, |
| 48 | /// Each job container's memory limit (`--memory`): `8g`. Three |
| 49 | /// quarters of the machine's (or the runner container's) memory if |
| 50 | /// left out. |
| 51 | #[serde(default)] |
| 52 | pub memory: Option<String>, |
| 53 | /// Each job container's CPUs (`--cpus`): `2`, `1.5`. Every CPU if left out. |
| 54 | #[serde(default)] |
| 55 | pub cpus: Option<String>, |
| 56 | /// The most processes in a job container (`--pids-limit`). 4096 if left out. |
| 57 | #[serde(default)] |
| 58 | pub pids_limit: Option<u32>, |
| 59 | /// With nested-container isolation, a job that uses Docker gets an |
| 60 | /// engine of its own. Off: jobs have no Docker. |
| 61 | #[serde(default = "yes")] |
| 62 | pub job_docker: bool, |
| 63 | /// The image a job's own engine runs: `docker:28-dind` if left out. |
| 64 | #[serde(default)] |
| 65 | pub job_docker_image: Option<String>, |
| 66 | } |
| 67 | |
| 68 | fn yes() -> bool { |
| 69 | true |
| 70 | } |
| 71 | |
| 72 | /// The runner's folder: `--dir`, `G1T_RUNNER_DIR`, else `.g1t-runner` in |
| 73 | /// the home folder. |
| 74 | pub fn folder(given: Option<&str>) -> PathBuf { |
| 75 | if let Some(dir) = given.filter(|d| !d.is_empty()) { |
| 76 | return PathBuf::from(dir); |
| 77 | } |
| 78 | if let Some(dir) = std::env::var_os("G1T_RUNNER_DIR").filter(|d| !d.is_empty()) { |
| 79 | return PathBuf::from(dir); |
| 80 | } |
| 81 | let home = std::env::var_os(if cfg!(windows) { "USERPROFILE" } else { "HOME" }) |
| 82 | .map(PathBuf::from) |
| 83 | .unwrap_or_else(|| PathBuf::from(".")); |
| 84 | home.join(".g1t-runner") |
| 85 | } |
| 86 | |
| 87 | pub fn path(folder: &Path) -> PathBuf { |
| 88 | folder.join("config.json") |
| 89 | } |
| 90 | |
| 91 | pub fn load(folder: &Path) -> Result<Config> { |
| 92 | let file = path(folder); |
| 93 | let text = std::fs::read_to_string(&file) |
| 94 | .with_context(|| format!("this runner is not registered ({} not found): run `g1t-runner register` first", file.display()))?; |
| 95 | serde_json::from_str(&text).with_context(|| format!("{} does not read", file.display())) |
| 96 | } |
| 97 | |
| 98 | /// Writes the configuration so only its owner can read it, through a |
| 99 | /// temporary file, so a crash never leaves half a credential. |
| 100 | pub fn save(folder: &Path, config: &Config) -> Result<()> { |
| 101 | std::fs::create_dir_all(folder).with_context(|| format!("could not make {}", folder.display()))?; |
| 102 | let file = path(folder); |
| 103 | let temp = folder.join("config.json.new"); |
| 104 | std::fs::write(&temp, serde_json::to_string_pretty(config)?)?; |
| 105 | #[cfg(unix)] |
| 106 | { |
| 107 | use std::os::unix::fs::PermissionsExt; |
| 108 | std::fs::set_permissions(&temp, std::fs::Permissions::from_mode(0o600))?; |
| 109 | } |
| 110 | std::fs::rename(&temp, &file).with_context(|| format!("could not write {}", file.display()))?; |
| 111 | Ok(()) |
| 112 | } |
| 113 | |
| 114 | pub fn forget(folder: &Path) { |
| 115 | let _ = std::fs::remove_file(path(folder)); |
| 116 | } |
| 117 | |
| 118 | /// The API for a site: `https://g1t.sh` calls `https://api.g1t.sh`. |
| 119 | pub fn api_for(url: &str) -> String { |
| 120 | let url = url.trim_end_matches('/'); |
| 121 | match url.split_once("://") { |
| 122 | Some((scheme, host)) if !host.starts_with("api.") && !host.starts_with("localhost") && !host.starts_with("127.") => { |
| 123 | format!("{scheme}://api.{host}") |
| 124 | } |
| 125 | _ => url.to_owned(), |
| 126 | } |
| 127 | } |
| 128 | |
| 129 | #[cfg(test)] |
| 130 | mod tests { |
| 131 | use super::*; |
| 132 | |
| 133 | #[test] |
| 134 | fn the_api_is_found_from_the_site() { |
| 135 | assert_eq!(api_for("https://g1t.sh"), "https://api.g1t.sh"); |
| 136 | assert_eq!(api_for("https://g1t.sh/"), "https://api.g1t.sh"); |
| 137 | assert_eq!(api_for("https://api.g1t.sh"), "https://api.g1t.sh"); |
| 138 | assert_eq!(api_for("https://git.example.com"), "https://api.git.example.com"); |
| 139 | assert_eq!(api_for("http://localhost:8787"), "http://localhost:8787"); |
| 140 | } |
| 141 | |
| 142 | #[test] |
| 143 | fn an_older_configuration_still_reads() { |
| 144 | let old = r#"{"url":"https://g1t.sh","api":"https://api.g1t.sh","runner":"rnr_1","name":"a","credential":"g1tr_x", |
| 145 | "workspace":"acme","labels":["self-hosted"],"work_dir":"/tmp/w"}"#; |
| 146 | let config: Config = serde_json::from_str(old).unwrap(); |
| 147 | assert!(config.docker && config.job_docker && config.auto_update); |
| 148 | assert_eq!(config.memory, None); |
| 149 | } |
| 150 | |
| 151 | #[test] |
| 152 | fn a_configuration_survives_a_round_trip() { |
| 153 | let dir = std::env::temp_dir().join(format!("g1t-runner-config-{}", std::process::id())); |
| 154 | let config = Config { |
| 155 | url: "https://g1t.sh".into(), |
| 156 | api: "https://api.g1t.sh".into(), |
| 157 | runner: "rnr_1".into(), |
| 158 | name: "build-01".into(), |
| 159 | credential: "g1tr_x".into(), |
| 160 | workspace: "acme".into(), |
| 161 | repo: None, |
| 162 | group: Some("Default".into()), |
| 163 | labels: vec!["self-hosted".into(), "linux".into()], |
| 164 | ephemeral: false, |
| 165 | work_dir: dir.join("work"), |
| 166 | docker: true, |
| 167 | image: None, |
| 168 | agent_image: None, |
| 169 | harness: None, |
| 170 | auto_update: true, |
| 171 | memory: Some("4g".into()), |
| 172 | cpus: None, |
| 173 | pids_limit: None, |
| 174 | job_docker: true, |
| 175 | job_docker_image: None, |
| 176 | }; |
| 177 | save(&dir, &config).unwrap(); |
| 178 | let back = load(&dir).unwrap(); |
| 179 | assert_eq!(back.runner, "rnr_1"); |
| 180 | assert_eq!(back.labels, config.labels); |
| 181 | assert_eq!(back.memory.as_deref(), Some("4g")); |
| 182 | forget(&dir); |
| 183 | assert!(load(&dir).is_err()); |
| 184 | let _ = std::fs::remove_dir_all(&dir); |
| 185 | } |
| 186 | } |