diff options
| -rw-r--r-- | ops/gerrit-autosubmit/.gitignore | 1 | ||||
| -rw-r--r-- | ops/gerrit-autosubmit/Cargo.lock | 302 | ||||
| -rw-r--r-- | ops/gerrit-autosubmit/Cargo.toml | 12 | ||||
| -rw-r--r-- | ops/gerrit-autosubmit/default.nix | 7 | ||||
| -rw-r--r-- | ops/gerrit-autosubmit/src/main.rs | 193 |
5 files changed, 515 insertions, 0 deletions
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mode 100644 index 0000000000..fa51614a08 --- /dev/null +++ b/ops/gerrit-autosubmit/Cargo.toml @@ -0,0 +1,12 @@ +[package] +name = "gerrit-autosubmit" +version = "0.1.0" +edition = "2021" + +# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html + +[dependencies] +anyhow = "1.0.75" +crimp = "4087.0.0" +serde = { version = "1.0.193", features = ["derive"] } +serde_json = "1.0.108" diff --git a/ops/gerrit-autosubmit/default.nix b/ops/gerrit-autosubmit/default.nix new file mode 100644 index 0000000000..f69a9248e3 --- /dev/null +++ b/ops/gerrit-autosubmit/default.nix @@ -0,0 +1,7 @@ +{ depot, pkgs, ... }: + +depot.third_party.naersk.buildPackage { + src = ./.; + nativeBuildInputs = [ pkgs.pkg-config ]; + buildInputs = [ pkgs.openssl ]; +} diff --git a/ops/gerrit-autosubmit/src/main.rs b/ops/gerrit-autosubmit/src/main.rs new file mode 100644 index 0000000000..9d7087d67d --- /dev/null +++ b/ops/gerrit-autosubmit/src/main.rs @@ -0,0 +1,193 @@ +//! gerrit-autosubmit connects to a Gerrit instance and submits the +//! longest chain of changes in which all ancestors are ready and +//! marked for autosubmit. +//! +//! It works like this: +//! +//! * it fetches all changes the Gerrit query API considers +//! submittable (i.e. all requirements fulfilled), and that have the +//! `Autosubmit` label set +//! +//! * it filters these changes down to those that are _actually_ +//! submittable (in Gerrit API terms: that have an active Submit button) +//! +//! * it filters out those that would submit ancestors that are *not* +//! marked with the `Autosubmit` label +//! +//! * it submits the longest chain +//! +//! After that it just loops. + +use anyhow::{Context, Result}; +use std::collections::{BTreeMap, HashMap, HashSet}; + +mod gerrit { + use anyhow::{anyhow, Context, Result}; + use serde::Deserialize; + use serde_json::Value; + use std::collections::HashMap; + use std::env; + + pub struct Config { + gerrit_url: String, + username: String, + password: String, + } + + impl Config { + pub fn from_env() -> Result<Self> { + Ok(Config { + gerrit_url: env::var("GERRIT_URL") + .context("Gerrit base URL (no trailing slash) must be set in GERRIT_URL")?, + username: env::var("GERRIT_USERNAME") + .context("Gerrit username must be set in GERRIT_USERNAME")?, + password: env::var("GERRIT_PASSWORD") + .context("Gerrit password must be set in GERRIT_PASSWORD")?, + }) + } + } + + #[derive(Deserialize)] + pub struct ChangeInfo { + pub id: String, + pub revisions: HashMap<String, Value>, + } + + #[derive(Deserialize)] + pub struct Action { + #[serde(default)] + pub enabled: bool, + } + + const GERRIT_RESPONSE_PREFIX: &'static str = ")]}'"; + + pub fn get<T: serde::de::DeserializeOwned>(cfg: &Config, endpoint: &str) -> Result<T> { + let response = crimp::Request::get(&format!("{}/a{}", cfg.gerrit_url, endpoint)) + .user_agent("gerrit-autosubmit")? + .basic_auth(&cfg.username, &cfg.password)? + .send()? + .error_for_status(|r| anyhow!("request failed with status {}", r.status))?; + + let result: T = serde_json::from_slice(&response.body[GERRIT_RESPONSE_PREFIX.len()..])?; + Ok(result) + } + + pub fn submit(cfg: &Config, change_id: &str) -> Result<()> { + let response = crimp::Request::post(&format!( + "{}/a/changes/{}/submit", + cfg.gerrit_url, change_id + )) + .user_agent("gerrit-autosubmit")? + .basic_auth(&cfg.username, &cfg.password)? + .send()? + .error_for_status(|r| anyhow!("submit failed with status {}", r.status))?; + + Ok(()) + } +} + +#[derive(Debug)] +struct SubmittableChange { + id: String, + revision: String, +} + +fn list_submittable(cfg: &gerrit::Config) -> Result<Vec<SubmittableChange>> { + let mut out = Vec::new(); + + let changes: Vec<gerrit::ChangeInfo> = gerrit::get( + &cfg, + "/changes/?q=is:submittable+label:Autosubmit+-is:wip+is:open&o=SKIP_DIFFSTAT&o=CURRENT_REVISION", + ) + .context("failed to list submittable changes")?; + + for change in changes.into_iter() { + out.push(SubmittableChange { + id: change.id, + revision: change + .revisions + .into_keys() + .next() + .context("change had no current revision")?, + }); + } + + Ok(out) +} + +fn is_submittable(cfg: &gerrit::Config, change: &SubmittableChange) -> Result<bool> { + let response: HashMap<String, gerrit::Action> = gerrit::get( + cfg, + &format!( + "/changes/{}/revisions/{}/actions", + change.id, change.revision + ), + ) + .context("failed to fetch actions for change")?; + + match response.get("submit") { + None => Ok(false), + Some(action) => Ok(action.enabled), + } +} + +fn submitted_with(cfg: &gerrit::Config, change_id: &str) -> Result<HashSet<String>> { + let response: Vec<gerrit::ChangeInfo> = + gerrit::get(cfg, &format!("/changes/{}/submitted_together", change_id)) + .context("failed to fetch related change list")?; + + Ok(response.into_iter().map(|c| c.id).collect()) +} + +fn autosubmit(cfg: &gerrit::Config) -> Result<bool> { + let mut submittable_changes: HashSet<String> = Default::default(); + + for change in list_submittable(&cfg)? { + if !is_submittable(&cfg, &change)? { + continue; + } + + submittable_changes.insert(change.id.clone()); + } + + let mut chains: BTreeMap<usize, String> = Default::default(); + for change_id in &submittable_changes { + let ancestors = submitted_with(&cfg, &change_id)?; + if ancestors.is_subset(&submittable_changes) { + chains.insert( + if ancestors.is_empty() { + 1 + } else { + ancestors.len() + }, + change_id.clone(), + ); + } + } + + // BTreeMap::last_key_value gives us the value associated with the + // largest key, i.e. with the longest submittable chain of changes. + if let Some((count, change_id)) = chains.last_key_value() { + println!( + "submitting change {} with chain length {}", + change_id, count + ); + + gerrit::submit(cfg, change_id); + + Ok(true) + } else { + println!("nothing ready for autosubmit, waiting ..."); + Ok(false) + } +} + +fn main() -> Result<()> { + let cfg = gerrit::Config::from_env()?; + + loop { + if !autosubmit(&cfg)? { + std::thread::sleep_ms(30000); + } + } +} |