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//! What:
//! The post-commit policy gate over a landed commit's own changes, and the backup that follows it.
//! Why:
//! The incumbent (`src/policy-engine/post-commit-lifecycle.ts`) checks the committed bytes of
//! every path a landed commit changed, and only a gate that passes lets the commit reach auto-push.
//! A blocked gate keeps the commit local and names it in a `commit-landed` event; the command exits `2`.
//! The landed commit is an input, so the integrator can call this after any landing.
//!
//! In TS you'd write (pseudocode):
//! ```ts
//! const result = await runPostCommitLifecycle({ rawArgs, transformedArgs, gitPath, cwd, landedOid, ... });
//! if (!result.blocked) await autoPush({ gitPath, cwd, landedOid: result.oid });
//! ```
/// The auto-push a clean gate hands the landed commit to, and the Git request it runs with.
use super::auto_push::{AutoPushResult, auto_push};
use super::auto_push_single_flight::{PushGit, SingleFlightError};
/// The landed-commit object name and the candidate layer's landed-delta source.
use super::candidate_object::parse_object_id;
use super::candidate_prediction::CandidateRequest;
/// The policy configuration the gate runs with.
use super::config_schema::PolicyConfig;
/// The failure code and the event kinds the gate emits.
use super::diagnostics::EngineFailureCode;
use super::policy_checks::shipped_checks;
use super::policy_content::LifecycleContent;
use super::policy_engine::{StageEnd, StageRequest, pass_exit_code};
use super::policy_events::{PolicyEvent, render_policy_events};
use super::policy_pass::run_policy_pass;
use super::policy_trigger::Trigger;
use super::repository_facts::git_facts;
use super::wrapper_controls::Controls;
/// Owned OS strings for the replayed global options and the child environment.
use std::ffi::OsString;
/// `Write` is the stderr sink the gate's JSONL lines go to.
use std::io::Write;
/// `Path` is a borrowed filesystem path.
use std::path::Path;
/// Exit status the command returns when the gate blocks the backup, as the incumbent's `PolicyDecisionError(2)`.
pub const POST_COMMIT_BLOCKED_EXIT_CODE: i32 = 2;
/// What:
/// The inputs of one post-commit gate.
/// Why:
/// The landed commit names the delta; the global prefix and the environment make every query read
/// the repository the commit landed in.
///
/// In TS you'd write (pseudocode):
/// ```ts
/// type PostCommitInput = { gitPath; cwd; landedOid; arguments; policySeverities; policyOptions };
/// ```
#[derive(Clone, Debug)]
pub struct PostCommitRequest<'request> {
/// Absolute real Git executable.
pub real_git: &'request Path,
/// The landed commit object name, as Git printed it.
pub landed_oid: &'request str,
/// The arguments the command forwarded to Git.
pub arguments: &'request [OsString],
/// The global options of the invocation, kept before every query (`-C`, `--git-dir`, `-c`).
pub global_prefix: &'request [OsString],
/// Variables added to every query.
pub overlay: &'request [(OsString, OsString)],
/// The policy severities and options the gate runs with.
pub config: PolicyConfig,
/// Escapes and flags the invocation carries.
pub controls: Controls,
}
/// What:
/// The settled gate:
/// the landed commit, every event it produced, and whether the backup must not run.
/// Why:
/// `events` already carries the `commit-landed` event when `blocked` is true,
/// so the caller renders one list.
///
/// In TS you'd write (pseudocode):
/// ```ts
/// type PostCommitLifecycleResult = { oid: string; events: PolicyEvent[]; blocked: boolean };
/// ```
#[derive(Clone, Debug, Eq, PartialEq)]
pub struct PostCommitGate {
/// The landed commit object name, as given.
pub oid: String,
/// Every event the gate produced, in order.
pub events: Vec<PolicyEvent>,
/// Whether the backup must not run.
pub blocked: bool,
}
/// What:
/// Run the post-commit policies over the landed commit's delta.
/// Why:
/// Only a gate with no blocking event, no failure and no pending correction lets the backup run;
/// a warning-only result is allowed, as in the incumbent.
/// A landed name that is not an object name is an engine failure, so the commit is kept and reported.
///
/// In TS you'd write (pseudocode):
/// ```ts
/// async function runPostCommitLifecycle(input): Promise<PostCommitLifecycleResult>;
/// ```
pub fn run_post_commit_gate(request: &PostCommitRequest) -> PostCommitGate {
let oid = request.landed_oid.to_owned();
let (mut events, end): (Vec<PolicyEvent>, StageEnd) =
match parse_object_id(request.landed_oid.as_bytes()) {
Some(commit) => run_staged_gate(request, commit),
None => (
vec![PolicyEvent::EngineFailure {
code: EngineFailureCode::ContentUnavailable,
message: format!("landed commit {} is not an object name", request.landed_oid),
trigger: Some(Trigger::PostCommit),
policy: None,
path: None,
}],
StageEnd::Failed,
),
};
let blocked = pass_exit_code(events.as_slice(), end) != 0;
if blocked {
events.push(PolicyEvent::CommitLanded { oid: oid.clone() });
}
return PostCommitGate {
oid,
events,
blocked,
};
}
/// Run the post-commit stage over the landed delta of a parsed commit name.
///
/// In TS you'd write (pseudocode):
/// ```ts
/// await dependencies.runPolicyEngine({ trigger: 'post-commit', gitFacts: createPostCommitGitFacts(...) })
/// ```
fn run_staged_gate(
request: &PostCommitRequest,
commit: super::candidate_object::ObjectId,
) -> (Vec<PolicyEvent>, StageEnd) {
let facts = git_facts(request.real_git, request.global_prefix, request.overlay);
let mut checks = shipped_checks(
facts,
request.arguments.to_vec(),
LifecycleContent::Requested(CandidateRequest::Landed(commit)),
Vec::new(),
);
let stage: StageRequest = StageRequest {
trigger: Trigger::PostCommit,
config: request.config.clone(),
controls: request.controls.clone(),
selected: Vec::new(),
};
let pass = run_policy_pass(&stage, &mut checks);
return (pass.events, pass.end);
}
/// What:
/// The result of the gate and the backup it allowed or prevented.
/// Why:
/// The exit status and the auto-push result come from one place, so the caller only reports them.
///
/// In TS you'd write (pseudocode):
/// ```ts
/// { gate: PostCommitLifecycleResult; autoPush?: AutoPushResult }
/// ```
#[derive(Clone, Debug, Eq, PartialEq)]
pub struct PostCommitOutcome {
/// The gate result, including the `commit-landed` event when blocked.
pub gate: PostCommitGate,
/// `0` after a backup or a warning-only gate; `2` when the gate blocked the backup.
pub exit_code: i32,
/// The auto-push result, absent when the gate blocked the backup.
pub auto_push: Option<AutoPushResult>,
}
/// What:
/// Run the gate, print its events, and back up the landed commit only when the gate allows it.
/// Why:
/// The incumbent prints the events before the backup and never backs up a blocked commit;
/// a failed backup is reported by `auto_push` and never changes the outcome's exit code.
///
/// In TS you'd write (pseudocode):
/// ```ts
/// const result = await runPostCommitLifecycle(input);
/// process.stderr.write(renderPolicyEvents(result.events));
/// if (!result.blocked) await autoPush({ gitPath, cwd, landedOid: result.oid });
/// ```
pub fn run_post_commit(
request: &PostCommitRequest,
git: &PushGit,
err: &mut dyn Write,
) -> Result<PostCommitOutcome, SingleFlightError> {
let gate = run_post_commit_gate(request);
let rendered = render_policy_events(0, gate.events.as_slice());
if !rendered.is_empty() {
err.write_all(rendered.as_bytes())
.map_err(SingleFlightError::Io)?;
}
if gate.blocked {
return Ok(PostCommitOutcome {
gate,
exit_code: POST_COMMIT_BLOCKED_EXIT_CODE,
auto_push: None,
});
}
let landed = gate.oid.clone();
let pushed = auto_push(git, landed.as_str(), err)?;
return Ok(PostCommitOutcome {
gate,
exit_code: 0,
auto_push: Some(pushed),
});
}
/// Post-commit gate behavior is controlled in the test module.
#[cfg(test)]
#[path = "post_commit_tests.rs"]
mod tests;