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ci: run every app-host unit shard when a PR changes the shard layout - #14435
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📝 WalkthroughWalkthroughThe CI chooser detects changes to app-host shard distribution inputs. When it detects such a change, it selects the full unit suite and bypasses suite narrowing and reverse-impact additions. ChangesApp-host shard layout selection
Priority: ⬇️ Low Estimated code review effort: 2 (Simple) | ~10 minutes Change: Bug fix Merge Risk: 🟡 Moderate · up to A shard-setting rename or removal can run only the one-suite canary, leaving the intended seven-shard coverage absent. Fix detection before merging. Security Architecture ReviewSecurity architecture risk: 🟡 Moderate · up to The change improves validation for recognized shard-layout edits, but some deletion or key-replacement forms of those edits may still receive the narrower canary run instead of the intended all-shard validation. Retained concerns
Security review detailsSecurity Blast Radius
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Full details: Docstring CoverageExplanation Docstring coverage is 58.33% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 12 functions across 2 files. (1 skipped: 1 unsupported.)
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In `@scripts/ci/choose_ci_suite.py`:
- Line 420: Update the workflow-hunk classification using changed_lines() and
shard_layout_lines() to recognize shard settings on both the old and new sides
of an edit, so renaming or removing a shard setting triggers every app-host unit
shard rather than the consumer canary.
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CLAUDE.mdscripts/ci/choose_ci_suite.pytests/test_ci_change_areas.py
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#14393 rebalanced the shards, took the one-suite consumer canary, and merged; main then failed four suites that only fail in the new order. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
The timings file, the sharder, the batch runner, and the app-host job's matrix and shard env decide which suites share a worker and in what order. Only running all seven shards shows order dependence; the one-suite consumer canary cannot. These now select the unit suite with no narrowing, as unit-ci does, without the rest of the full suite. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
changed_lines() reports new-side lines only, so a ci-macos.yml edit that deleted a CMUX_APP_HOST_*_SHARD setting or a matrix shard entry, or renamed it to another key, left no layout line on the new side and took the one-suite canary. Scan the workflow's removed lines for those settings too. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Why
#14393 rebalanced the app-host unit shards from measured timings. Its files (the timings JSON,
cmux_unit_test_shard.py,run-app-host-unit-batches.sh, and the shard env inci-macos.yml) are app-host consumer paths, so the PR run took the one-suite consumer canary and passed. After it merged, main failed four suites that only fail in the new order:TerminalNotificationDirectInteractionTests,AgentSessionAutoResumeSettingsTests,VaultQueuedRestoreIdentityTests,SidebarAccessibilityTreeTests(run 36101756298, job 107971365714).A shard layout change decides which suites share a worker and in what order they run. The canary cannot see order dependence; only running every shard can.
What
scripts/ci/choose_ci_suite.pygainsSHARD_LAYOUT_PATHSandshard_layout_changed(). A diff that touches any of these runs the app-host unit suite with no narrowing, the same as theunit-cilabel (emptyunit_selectors, so ci-macos.yml takes the seven-shard matrix, andunit_canary=false, so it is not dropped when the compile is reused). It does not setfull_suite, so no Release build, package tests, or lag lane.scripts/ci/cmux-unit-test-timings.json,scripts/ci/cmux_unit_test_shard.py,scripts/ci/run-app-host-unit-batches.sh: any edit..github/workflows/ci-macos.yml: only hunks in theapp-host-unit-testsjob'sstrategy:block (the shard matrix) or its job envCMUX_APP_HOST_*SHARD/CMUX_APP_HOST_RESERVED_WALL_SECONDSlines, found with the existingjob_lines/changed_lineshelpers. Other hunks in that job keep the consumer canary. An edit without hunks counts.scripts/ci/generate_test_timings.pyis left out: no CI job runs it, and a layout change it makes arrives as the timings JSON it writes.An edited cmuxTests/ suite in the same diff does not narrow the run to that suite.
How validated
test_a_shard_layout_edit_runs_every_app_host_unit_shardintests/test_ci_change_areas.py, committed first and failing on68cf9ff18f7f(ImportError, noSHARD_LAYOUT_PATHS), passing on the fix. It replays ci: rebalance app-host shards from measured timings on all seven workers #14393's file list with and without the reserved-wall-seconds hunk and checks the chooser's outputs end to end, plus the placement rules for ci-macos.yml.python3 tests/test_ci_change_areas.py: PASS.tests/test_ci_cli_product_routing.py: OK.tests/test_ci_main_full_suite.pyhas one failure (test_the_dispatch_step_waits_until_its_run_is_listed) that fails identically on upstream/main without this change.🤖 Generated with Claude Code
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@codesmith-botwith what you need. Autofix is disabled.Summary by cubic
A shard layout change decides which app-host unit suites share a worker and in what order they run, but PRs that touched it only ran the one-suite consumer canary, so order-dependent failures slipped through (#14393 merged and main failed four suites). Now a diff that changes the layout runs every app-host unit shard on all seven workers.
cmux_unit_test_shard.py,run-app-host-unit-batches.sh, or the app-host job's shard matrix and env inci-macos.yml— including a shard setting the diff removes or renames to another key.unit-cilabel (emptyunit_selectors, no canary drop) without the rest of the full suite; otherci-macos.ymlhunks keep the canary.generate_test_timings.pyout since no CI job runs it; its layout change arrives as the timings JSON it writes.Written for commit 5007ac9. Summary will update on new commits.
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