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claude runtime: interrupting a session kills every process it started

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hive-claude 0.1.3 spawns claude as the leader of its own process group,
and its `Cancel::cancel` and idle watchdog signal that group instead of
claude's pid alone. Commands claude started (a `nix build`, a test run)
used to survive a subagent `interrupt` and keep running.

Bump hive-claude to 0.1.3. The subagent `interrupt` call site needs no
code change: `Cancel::cancel(force)` kept its signature.

The harness's `/cancel` and `/logout` did not go through hive-claude:
they ran `kill -INT <pid>` on the claude child they found in /proc. They
now SIGINT the group that child leads, through `libc::kill`. A `claude`
child that leads no group (the `claude plugin` calls) shares the
harness's group and is still signalled alone.

Tests: an interrupted subagent's grandchild dies, for both SIGINT and
`force`, and fails on hive-claude 0.1.2; a harness cancel stops a
turn's grandchild, and fails when only the pid is signalled.
This commit is contained in:
atlas 2026-10-10 13:44:10 +02:00 • committed by mara
commit 028c283ff9
8 changed files with 244 additions and 24 deletions
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2
hive-agent/src/web_ui/auth.rs
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@ -84,7 +84,7 @@ pub(super) async fn post_login_cancel(State(state): State<AppState>) -> Response
/// preservation invariants.
pub(super) async fn post_logout(State(state): State<AppState>) -> Response {
// Step 1: SIGINT claude (best-effort, matches `post_cancel_turn`).
let _ = super::sigint_claude().await;
let _ = super::sigint_claude();
// Step 2: delete OAuth credential files only — login::clear_session owns
// the file set and preserves session-history files alongside them.
let dir = crate::paths::claude_dir();