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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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14
docs/web-ui/agent.md
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@ -227,11 +227,11 @@ Slash commands today:
- `/help` — list commands locally.
- `/clear` — wipe the local terminal view (server history kept).
- `/cancel` — `POST /api/cancel` → host shellouts `pkill -INT
claude`, emits a Note. On an ACP agent it sends the agent
`session/cancel` instead, and kills it if the turn hasn't ended 10s
later. Also surfaces as a `■ cancel turn` button in the state row
while state=thinking.
- `/cancel` — `POST /api/cancel` → SIGINT to the turn's claude and every
command it started (its process group), emits a Note. On an ACP agent
it sends the agent `session/cancel` instead, and kills it if the turn
hasn't ended 10s later. Also surfaces as a `■ cancel turn` button in
the state row while state=thinking.
- `/compact` — `POST /api/compact` → sets the deferred
`Bus::request_compact()` flag and returns immediately. The harness
runs the `/compact` at the next turn boundary (end of the in-flight
@ -272,8 +272,8 @@ shaped).
- `POST /login/{start,code,cancel}` — claude OAuth login flow.
Start/cancel emit `LiveEvent::StatusChanged` to flip the
badge to/from `needs_login_in_progress`.
- `POST /api/cancel` — SIGINT the in-flight claude turn. Emits a
`LiveEvent::Note`.
- `POST /api/cancel` — SIGINT the in-flight claude turn and the
commands it started. Emits a `LiveEvent::Note`.
- `POST /api/compact` — run `/compact` on the persistent session
(same MCP config + system prompt + allowed tools as a normal
turn — only the stdin payload differs). Flips state to