Restructures the guest cgroup layout so each exec gets its OWN child cgroup
(/container/<id>/<execID>) with memory.oom.group=1, a fair cpu.weight, and a
pids.max backstop — so one control session can't OOM-kill, starve, or fork-bomb
its siblings in the shared container. The container init moves to its own leaf
so the container cgroup can delegate controllers to children (cgroup v2
no-internal-process rule). New Cgroup2Manager helpers: setOomGroup/setCpuWeight/
setPidsMax/remove.
Best-effort with graceful fallback: any failure in the per-exec setup wipes the
partial state and reverts to today's flat layout, and each exec falls back to the
container cgroup — a cgroup hiccup degrades to current behavior, never a failed
start.
COMPILE-VERIFIED via the musl cross-build; NOT yet runtime-validated. Built as
image tag -nucleic2; vminitReference stays on the validated -nucleic1 until
-nucleic2 is checked in a real container. A hard host-configured per-exec
memory.max (exec-RPC resources field) remains a follow-up.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
cctl login stores the credential in the macOS Keychain, which cctl images push
reads automatically — so pushing needs no REGISTRY_* env vars after a one-time
login. Env vars remain as a fallback.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
The swiftly toolchain used by the vminit-image CI resolves Foundation/
Virtualization but not the 'os' overlay, so 'import os' failed with
"no such module 'os'". Guarding the diagnostic logger degrades it to a
no-op under such toolchains while local (Xcode) builds keep it.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
Host-side (ships with a normal swift build):
- LinuxProcess: non-blocking stdio relay (O_NONBLOCK + nucleicDrainNonBlocking)
so a wedged stream can't head-of-line-block sibling execs' relays; atomic
stdio-or-abort start (patches #5, #6).
- Vminitd: bounded deleteProcess timeout so teardown can't hang a wedged
channel (patch #7).
- ContainerizedProcessHandle: call LinuxProcess.delete() after exit and on
force-close — fixes a per-turn leak (per-exec vsock/gRPC connection +
runConnections() task) in the long-lived shared control container. Likely
the "degrades until app restart" root cause.
- ClaudeCodeBackend: map the atomic-start abort to a recoverable AgentError so
a failed launch settles as retryable instead of locking the composer.
Guest-side (rides the custom vminitd initfs; inert until the image is built):
- ManagedProcess: offload the blocking start off the gRPC event loop (patch #8).
- Per-exec cgroups (patch #9) recorded as design only — cross-cutting.
Pipeline:
- .github/workflows/vminit-image.yml builds vminitd from the vendored source
and pushes ghcr.io/abkslm/vminit; ContainerEngine.vminitReference repointed
at the custom image.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
abkslmandClaude Opus 4.8