ci: survive an owned Mac whose Homebrew prefix the runner does not own - #16148
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Run 36752535712 built the app-host and UI test product on
cmux-austin-mini-1-glaeda-1, 17 minutes, then lost the whole job in the
"Install tmux" step:
Error: /opt/homebrew/Cellar is not writable. You should change the
ownership and permissions of /opt/homebrew/Cellar back to your
user account:
sudo chown -R cmux /opt/homebrew/Cellar
brew refuses outright when the prefix belongs to another account, so
the step exits 1, "Resolve selectors against the built tests" is
skipped, and the job reports TEST_RESULT=failed with TEST_SUMMARY and
TEST_OUTPUT both empty. The dispatch looks like a test failure and names
no cause short of reading the raw log.
scripts/ci/brew-ensure.sh retries the install as the prefix owner, and
when even that cannot produce the command it fails with the runner name
and the package to provision. Both brew installs in the E2E action use
it. Each call site keeps its old inline path behind an -x check, because
this action runs against the tested revision's checkout, which may
predate the script.
This does not provision that mini; it stops one missing package from
throwing away a build that already succeeded, and makes the next
occurrence legible from the step summary.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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📝 WalkthroughWalkthroughThe CI action now uses ChangesCI package setup
Priority: ⬇️ Low Estimated code review effort: 2 (Simple) | ~10 minutes Change: Bug fix Merge Risk: 🔵 Low · up to The helper improves Homebrew installation recovery, but its owner retry can still trigger automatic updates and add CI latency. Set the suppression variable on that retry; otherwise, the remaining risk is bounded. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to The current callers install only tmux and ffmpeg, retain compatibility fallbacks, and fail when the required command remains unavailable. The new retry nevertheless runs installation under another account. Actual runner permissions and account ownership are not established, so the added authority cannot be fully assessed. No introduced exploit was verified. Retained concerns Security review detailsSecurity Blast Radius
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Inline comments:
Review comments at @scripts/ci/brew-ensure.sh:
- Line 40: Update the owner retry in the brew install flow to set
HOMEBREW_NO_AUTO_UPDATE for the command run by sudo, preserving the existing
install arguments and failure handling.
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.github/actions/e2e-run-tests/action.ymlscripts/ci/brew-ensure.sh
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Review of the first commit found five ways the fix would not have helped the run it was written for. The helper was called workspace-relative, so it came from the tested revision. test-e2e.yml checks the action out of the workflow's own revision into .e2e-workflow with a sparse-checkout that did not list the helper, so a re-dispatch of the ref from the failing run, and every step of a regression bisect into older history, would have taken the old inline brew install and failed identically. Add the helper to both sparse-checkout blocks and prefer the .e2e-workflow copy at both call sites, the way the frames script already does. Guard on -f and invoke through bash instead of -x. A lost mode bit made the ffmpeg branch fall through to an unconditional brew install, which fails on an unowned prefix even when ffmpeg is already there: worse than no helper at all. The retry now runs sudo -n, gated on sudo -n true, which is how the rest of this action and run-in-console-session.sh treat passwordless sudo on these Macs. Without -n, a host with a controlling tty would block on the prompt until the job timed out, holding a Mac. HOMEBREW_NO_AUTO_UPDATE was a command prefix on the first install only, and sudo's env_reset would drop it regardless, so the retry could trigger a full brew update inside a step that had already burned the build. Carry it over the sudo hop with /usr/bin/env, as action.yml:545 does. Every failure path now prints [cmux-ci machine: brew-provision], so machine_failure.py classifies it directly instead of depending on Homebrew's own wording reaching the log. A root-owned prefix gets its own message, since brew refuses to run as root and no hop fixes that. Verified: shellcheck and bash -n clean, actionlint clean on test-e2e.yml, both YAML files parse, tests/test_ci_machine_failure.py passes with the new case (8 tests), tests/test_ci_self_hosted_guard.sh passes, and all eight branches of the script exercised under brew/stat/sudo shims exit 0 only with the command present and non-zero only with it missing. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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Review: a subagent reviewed Fixed:
Also corrected in the description: the tmux failure did not skip Left: nothing from the review is unaddressed. Two limits stand. Whether Verification on — Raindrop g2 🫧 |
CI failure attributionCI stopped on
Matched log linesNot re-run automatically: Written by |
test_the_build_runner_runs_the_tests_so_a_run_queues_once asserts the sparse-checkout list verbatim, so adding scripts/ci/brew-ensure.sh to it reddened app-host-execution. The addition is intended: without it the helper is absent from .e2e-workflow and the action falls back to the tested revision's copy. Also assert every entry exists. A sparse-checkout of a path that is not in the repo is silent, so a typo there would leave the action reading a missing file and silently taking the older copy instead. Verified: python3 tests/test_ci_e2e_compilation_cache.py, 25 tests OK. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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main no longer compiles after this merge@teamleaderleo: after Evidence: https://github.com/manaflow-ai/cmux/actions/runs/36763591498/job/110052392406 Nothing blocks merging meanwhile. A fix-forward (or, failing that, a revert) is attempted automatically unless an open pull request already fixes this. main_compile_attribution.py: post-merge, nothing here gates a merge. |
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What happened
Dispatch 36752535712 ran
cmuxUITests/AutomationSocketUITestson main headb3d644ba873. It built the app-host and UI test product successfully oncmux-austin-mini-1-glaeda-1(labelglaeda-light-xcode-26.6), 17 minutes of compile, and then lost the whole job in the next step:/opt/homebrewand 30 subdirectories are not writable by the runner usercmuxon that machine, andbrew installrefuses outright rather than degrading. The step exits 1, no test is ever selected, and the job reportedTEST_RESULT: failedwithTEST_SUMMARY:andTEST_OUTPUT:both empty. The dispatch reads as a test failure.machine_failure.py:24does recognize Homebrew's own "The following directories are not writable by your user", so the dispatcher's repeat guard would already have read this as a machine failure, but nothing in the published summary names the cause for a person; you have to read the raw log.What this changes
scripts/ci/brew-ensure.sh <package> [command]:HOMEBREW_NO_AUTO_UPDATE=1,stat -f %Su "$(brew --prefix)"and, when passwordless sudo is available, retries the install as that user over a/usr/bin/envhop that carriesHOMEBREW_NO_AUTO_UPDATE(gated onsudo -n true, the wayaction.yml:542-545treats sudo on these Macs),::error::annotation naming the runner and the package to provision, tagged[cmux-ci machine: brew-provision]somachine_failure.pyclassifies it directly instead of depending on Homebrew's wording reaching the log.Both
brew installcall sites in.github/actions/e2e-run-tests/action.ymlgo through it:Install tmux(unconditional, the one that cost this build) andInstall ffmpeg(behindrecord-video, which was skipped in the failing run and so is untested by it, same hazard).test-e2e.ymlchecks this action out of the workflow's revision into.e2e-workflow, so the helper is listed in both sparse-checkout blocks and both call sites prefer$GITHUB_WORKSPACE/.e2e-workflow/scripts/ci/brew-ensure.sh, falling back to the repo-relative path. Without that, the helper would come from the tested revision, and a re-dispatch ofb3d644ba873or any regression-bisect step into older history would take the old inline command and fail identically.Build UI test stepsreadse2e-frames.pythe same way ataction.yml:846. Each call site keeps its old inline command behind an[ -f "$helper" ]check and invokes throughbash, so a lost mode bit cannot change behaviour.What this does not do
It does not provision that mini.
cmux-austin-mini-1-glaeda-1still wants tmux installed, or a Homebrew prefix its runner user owns, and I cannot reach the machine from here. What this PR buys is that a missing package no longer discards a build that already succeeded when the prefix owner is reachable, and the next occurrence is legible from a job annotation and classifiable bymachine_failure.pyinstead of only from the raw log.Publish test summarystill reportsTEST_RESULT: failedwith both fields empty; this PR does not change that.Checks run
shellcheck -s bash scripts/ci/brew-ensure.shandbash -n: clean.actionlinton.github/workflows/test-e2e.yml: clean. On the composite action it emits only its usual "this is not a workflow" syntax complaints, which carry no signal.tests/test_ci_machine_failure.py: 8 tests OK, including the new case for the[cmux-ci machine: brew-provision]signature.tests/test_ci_self_hosted_guard.sh: all PASS.brew,statandsudoshims: already present, no args, no brew on PATH, prefix owner unreadable, owner is this user, owner is root, owner differs with no passwordless sudo, owner differs with the retry failing, owner differs with the retry succeeding. It exits 0 only where the command is present and non-zero only where it is missing.guard-sweep.py, 229 run blocks): the failures are the standard submodule-less-Linux set (missingghostty/build.zig.zon, missingvendor/bonsplit/Sources, unboundRUNNER_TEMP/CMUX_TEST_REGISTRY_BASE_REF/REPOSITORY).tests/test_ci_app_host_xcodebuild_retry.shfailed under the parallel sweep and passes on its own; it reads neither file in this diff.Two limits stand. The owner-retry branch is exercised only under shims, never against Homebrew, because that needs a Mac with a prefix owned by another account. And whether
sudo -ncan succeed for usercmuxoncmux-austin-mini-1-glaeda-1is unknown: that job log contains nosudoinvocation at all, so on that mini this may buy a classifiable annotation and nothing more.🤖 Generated with Claude Code
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@codesmith-botwith what you need. Autofix is disabled.Summary by cubic
Stops a Homebrew prefix owned by another account from discarding an E2E job whose build already succeeded. A CI run lost a 17-minute build when
brew install tmuxrefused because/opt/homebrewwasn't writable by the runner user; the job reported a test failure with empty test summary and output.scripts/ci/brew-ensure.shshort-circuits for commands already on PATH and retries the install as the prefix owner when the runner lacks write access.brew installcall sites in the E2E action use the script, preferring the workflow-own copy checked out into.e2e-workflowso re-dispatches and bisects into older history still run it; a still-missing command fails with an error naming the runner and the package.[cmux-ci machine: brew-provision], whichmachine_failure.pyclassifies so a dispatcher retries the run instead of reading it as a test failure.HOMEBREW_NO_AUTO_UPDATEacross it via/usr/bin/env.Written for commit ec2f0a2. Summary will update on new commits.
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