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hive-runtime: kill an ACP agent's whole process group, not just its pid

The ACP agent was spawned with only `kill_on_drop`, which SIGKILLs the
agent's own pid. Commands the agent had started (a `nix build`, a test
run) were reparented and kept running after the agent was killed: when a
subagent run ends after `interrupt`, when an agent ignores
`session/cancel` past the grace, and when the harness drops the runtime.

The agent now leads its own process group (`process_group(0)`), and
dropping its `Connection` SIGKILLs that group. The soft path is unchanged:
`interrupt` / `Canceller::cancel` still sends `session/cancel`.

Refs #4999. The claude half needs hive-claude 0.1.3, which is not on
crates.io yet.
This commit is contained in:
atlas 2026-10-09 23:57:07 +02:00
commit 8d206f124f
6 changed files with 149 additions and 7 deletions

1
Cargo.lock generated
View file

@ -2012,6 +2012,7 @@ name = "hive-runtime"
version = "0.1.0"
dependencies = [
"hive-claude",
"libc",
"serde",
"serde_json",
"swarm-secret-client",