[teamleaderleo]

Leo: "the incrementally, you know, tracking the latest commit or whatever, building it off the right way, building the right things, like reusing as much as you can"

What

This fixes a bug in #24964: the DEV Release product reuse never ran. Its off switch was vars.CI_NEXT_DEV_PRODUCT_REUSE == '0'. When that variable is unset, the expression sees null, and GitHub converts both null and '0' to the number 0 before comparing them. So the comparison was true on every run, and the lookup skipped itself.

Evidence: the first producer after landing, DEV run 40163060381 (3f08df3), logged the notice vars.CI_NEXT_DEV_PRODUCT_REUSE is 0, and the variable is not set (HTTP 404). That run still compiled and wrote its record (cmux-next-dev-release-product-13b521d3…), so nothing broke. Reuse just never fired.

The fix compares the variable's string form instead: format('{0}', vars.CI_NEXT_DEV_PRODUCT_REUSE) == '0'. An unset variable formats as '', which is not '0', so reuse stays on. Setting the variable to 0 still turns it off.

A new test in tests/test_dev_release_product_reuse.py fails if the lookup step has any bare vars.X == '<digit>' comparison. It fails on base and passes here.

Success / failure

• Success: the next DEV run on a product-unchanged merge prints DEV Release product: hit, and its compile job takes ≤ ~60 s.
• Failure: reuse stays off while the variable is unset, or setting it to 0 no longer turns reuse off.

Risk

Low. This is a one-expression change, and it turns on the reuse path that #24964 reviewed and landed. The trust checks and the digest check behind that path are unchanged.

Agent session: cosmic-gray

🤖 Generated with Claude Code

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[teamleaderleo]

Owned by claude-sr2/incremental-build on cosmic-gray · session

[github-actions]

cmux status _{(one comment, edited in place; each line is updated by the job that owns it)}

Review 5f05849: HQ feed card · gallery before/after runs · checks

App of this head (app.zip, kept 1 day)

gh workflow run reload-build.yml -R manaflow-ai/cmux --ref feat-cmux-next -f tag=pr25075 -f ref=incremental-build-pr3c-reuse-switch -f platform=macos -f backend_mode=local

red: cmux-next checks (god files, concurrency, crash safety, l10n); base red: the same failure on the base 1a19cf5; does not block

[blacksmith-sh]

Found 12 test failures on Blacksmith runners:

Failures

Test	View Logs
/tmp/tmpsb7941c5/summary-fail.json (live):/summary-fail.json (live):	View Logs
/tmp/tmpse1woj1a/summary-missing.json (live):/summary-missing.json (live):	View Logs
[new_workspaces] debug.new_workspace timed 0 of 50 new workspace rows/ [new_workspaces] debug.new_workspace timed 0 of 50 new workspace rows	View Logs
[new_workspaces] the window draws no frames/[new_workspaces] the window draws no frames	View Logs
[tabs] debug.tab_switch timed 0 of 40 switches/ [tabs] debug.tab_switch timed 0 of 40 switches	View Logs
[tabs] the window draws no frames/[tabs] the window draws no frames	View Logs
convention violations found (ERROR lines above)./ convention violations found (ERROR lines above).	View Logs
nightly.yml prepare-nightly-variant: 'Package prepared app for signing' is not in list/ nightly.yml prepare-nightly-variant: 'Package prepared app for signing' is not in list	View Logs
test_secret_free_prepare_fallback_does_not_requeue_a_retry_on_the_side_pool (main.N ightlyOffBlacksmithTests.test_secret_free_prepare_fallback_does_not_requeue_a_retry_on_ the_side_pool)/ test_secret_free_prepare_fallback_does_not_requeue_a_retry_on_the_side_pool (main.N ightlyOffBlacksmithTests.test_secret_free_prepare_fallback_does_not_requeue_a_retry_on_ the_side_pool)	View Logs
test_targets_outside_the_app_go_to_the_mac_canary (main.SwiftCanaryFleetCoverage.te st_targets_outside_the_app_go_to_the_mac_canary)/ test_targets_outside_the_app_go_to_the_mac_canary (main.SwiftCanaryFleetCoverage.te st_targets_outside_the_app_go_to_the_mac_canary)	View Logs

...and 2 more test failures. View all on Blacksmith

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[teamleaderleo]

Bead cx-c1dcr created for this PR by the cmux coordinator.

[github-actions]

Shipped in:

• cmux NEXT nightly 1.0.0-nightly.4016664586501 (c6ebb072b1)
• cmux NEXT nightly 1.0.0-nightly.4016783882601 (6c8013633b)
• cmux NEXT nightly 1.0.0-nightly.4016807535201 (bc010d814e)