fix(executor): bound registry artifact cache with leased LRU eviction - #3139
fix(executor): bound registry artifact cache with leased LRU eviction#3139daryllimyt wants to merge 163 commits into
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✅ No security or compliance issues detected. Reviewed everything up to f51ad27. Security Overview
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tracecat/tracecat/executor/registry_artifacts.py
Lines 612 to 613 in 8c41cf8
Retry failed tar staging cleanup at runtime
When a failed or cancelled tar extraction leaves files that rmtree cannot remove because of a transient filesystem error, ignore_errors=True silently retains the partial .tmp tree in staging/. Capacity checks continue charging those bytes, but runtime maintenance clears only trash/ and paths recorded during the startup sweep, so later cold admissions can fail until the executor restarts. Detect the cleanup failure and add this exact staging path to a runtime retry mechanism.
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tracecat/tracecat/sandbox/unsafe_pid_executor.py
Lines 315 to 320 in a789186
Restore supervision for the unsafe PID fallback
Fresh evidence after the prior containment fix is that _build_execution_cmd() again returns the bare Python command when PID namespaces are unavailable. In supported Linux deployments using the unsafe fallback, a script can start a detached setsid() descendant and return; communicate_process_group() only kills the original process group, so the descendant survives while the registry lease is released and its imported artifact may be unmounted or evicted. Route this fallback through the subreaper supervisor again.
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tracecat/tracecat/sandbox/unsafe_pid_executor.py
Lines 477 to 480 in 001dbea
Restore supervision for unsafe run-python fallback
When PID namespaces are unavailable—which includes the inspected Docker Compose and Fargate defaults—a script can launch a detached descendant with setsid() and return; this call uses the default terminator, which only kills the original process group, so the descendant survives after the registry lease is released and its import paths may be evicted. Fresh evidence after the earlier thread is that the current _build_execution_cmd() again returns the unsupervised base_cmd, removing the supervisor-based cleanup that had addressed this case.
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Resolved the cache-root-child discussion as outside this change: Direct and UnsafePid execution is intentionally outside a filesystem sandbox and can write any host path accessible to the executor UID, so restricting only the derived cache root would not establish a security boundary. The cache root is configurable, and deleting arbitrary top-level children that the cache cannot prove it owns could delete unrelated data. Those bytes remain accounted as non-evictable so admission fails closed. Enforcing filesystem isolation requires sandboxing or a separate UID. |
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Summary
Bounds the executor registry-artifact cache without allowing eviction to race active actions. The lifecycle now centers on three invariants: one runtime state per cache key, SquashFS mounts scoped to active leases, and
trash/as the durable deletion retry queue.Stack
Builds on #3159, now merged, which guarantees action subprocess descendants are gone before their cache leases are released.
Changes
RegistryArtifactCache.lease()the only public path-access API so every consumer participates in eviction safety.entries/<key>/and keep one process-local runtime state per key for locking, lease accounting, and recency.trash/; the directory itself is the retry queue, and deletion runs off the event loop with cancellation-safe thread rejoining..partfiles on cancellation and discard only empty entry shells after failed materialization, while retaining reusable canonical images..partdownloads, and preserve legacy backing images for active mounts.Testing
133 passed146 passed, 1 skipped1 passed1511 files)0 errors, 0 warningsLOC breakdown
Related Issues
ENG-1568
Summary by cubic
Bounds and hardens the executor registry artifact cache with leased LRU eviction so disk use stays within limits and loop devices are released. Leases span
run_pythonand the Test backend; a Linux supervisor ensures subprocesses are killed and reaped on cancellation. Fixes ENG‑1568.New Features
run_pythonand Test.TRACECAT__EXECUTOR_REGISTRY_CACHE_MAX_ENTRIESandTRACECAT__EXECUTOR_REGISTRY_CACHE_MAX_BYTES(64, 10 GiB; 0 disables); configurable viadocker-compose*and Fargate variables.ensure_swept(), runs off‑loop, warmed at worker start, retried on failure, and remains fail‑open. Storage downloads reserve disk and redact bucket/key/provider on transport errors.Bug Fixes
Written for commit f51ad27. Summary will update on new commits.