reload: CMUX_DEV_BACKEND_MODE=local for checkouts without the shared dev backend - #12973
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Since 3a114be, ./scripts/reload.sh --tag <tag> exits before the build unless scripts/dev-backend.sh exists, and that helper is only installed by cmuxterm-hq. CONTRIBUTING.md still gives that command as step 3. This commit adds the failing test only. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
…dev backend A tagged reload resolves the maintainers' shared dev backend through scripts/dev-backend.sh, which only cmuxterm-hq installs. Everywhere else the documented build command exited before building, with no way forward except --prod-auth. CMUX_DEV_BACKEND_MODE=local keeps the local dev origin reload.sh already computes (http://localhost:<tag port>), which is what every tagged build used before 3a114be, and does not bake a shared backend URL into the app. The default stays remote and stays strict, so cmuxterm-hq checkouts behave exactly as before; the error now names the opt-in. CONTRIBUTING.md uses it in step 3. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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Included review availability: Your plan provides up to 10 included reviews per hour; 0 remain after this review. 📝 WalkthroughWalkthroughTagged reload now supports explicit local backend resolution through ChangesTagged backend mode
Priority: ⬇️ Low Estimated code review effort: 2 (Simple) | ~12 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant Developer
participant reload.sh
participant cmux_resolve_tagged_backend
participant dev-backend.sh
Developer->>reload.sh: run tagged reload
reload.sh->>cmux_resolve_tagged_backend: pass local origin and mode
alt local mode
cmux_resolve_tagged_backend-->>reload.sh: return localhost origin
else remote mode
cmux_resolve_tagged_backend->>dev-backend.sh: resolve shared backend
dev-backend.sh-->>cmux_resolve_tagged_backend: return backend URL
cmux_resolve_tagged_backend-->>reload.sh: return backend URL
end
Important Pre-merge checks failedPlease resolve all errors before merging. Addressing warnings is optional. ❌ Failed checks (1 error, 1 warning)
✅ Passed checks (23 passed)
Full details: Cmux User-Facing Error PrivacyExplanation The pull request adds user-visible command errors in Resolution Keep user-facing errors generic. For example, report that local mode cannot be combined with a shared backend URL, that the backend mode is invalid, or that a local development origin is required, without naming environment variables or
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Inline comments:
In `@tests/test_reload_local_backend_mode.sh`:
- Around line 1-48: Extend the reload test to exercise scripts/reload.sh rather
than only cmux_resolve_tagged_backend, verifying local tagged reload passes the
resolved local origin to the app and does not export CMUX_DEV_BACKEND_URL. Keep
the existing resolver assertions, and use a stubbed reload/build boundary so the
test remains isolated while checking the caller-level environment.
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.github/workflows/ci.ymlCONTRIBUTING.mdscripts/lib/dev-backend-origin.shscripts/reload.shtests/test_reload_local_backend_mode.sh
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Review pointed out the test only exercised the resolver. It now also fails if reload.sh stops passing its local origin, or exports CMUX_DEV_BACKEND_URL in local mode. Both mutations were checked by hand. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Both options choose which backend a tagged build talks to, and this keeps the --tag help block free for manaflow-ai#12962, which adds to it. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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The caller-level coverage is present in the latest branch ( |
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Reviewed against cmuxterm-hq shared Mac fleet and dev-backend workflow. The design is safe: remote remains the default and fail-closed, existing team builds are unchanged, and local mode is explicit for external contributors. Regression and shell validation pass. I recommend merge; the remaining caller-level runtime-test improvement is non-blocking. |
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Summary
CMUX_DEV_BACKEND_MODE=locallets./scripts/reload.sh --tag <tag>build in a checkout that was not created throughcmuxterm-hq. The default staysremoteand stays strict.Why: since 3a114be (2026-09-17), a tagged reload resolves the shared dev backend through
scripts/dev-backend.sh. That helper is not in this repository; onlycmuxterm-hqinstalls it. Everywhere else the command fromCONTRIBUTING.mdstep 3 exits before the build starts:On
mainat e91468b that takes 0.5 s. The only ways past it are--prod-auth, or aCMUX_DEV_BACKEND_URLon the team tailnet.What local mode does: keeps the origin
reload.shalready computes,http://localhost:<tag port>, which is what every tagged build used before 3a114be. It does not exportCMUX_DEV_BACKEND_URL, so no shared backend URL or Tailscale host is baked into the app, and the Iroh broker default falls back to staging as it did before.What does not change: with the variable unset, a missing helper is still a hard error, so a mis-created hq worktree still fails loudly. The error gains one line naming the opt-in. Local mode refuses to be combined with
CMUX_DEV_BACKEND_URL, and an unknown mode is rejected.If you would rather make
localthe default in this repository and have hq tooling setremote, that is a smaller diff here and I'm happy to flip it.Testing
tests/test_reload_local_backend_mode.shand itsworkflow-guard-testsstep and fails; 52ef71c makes it pass. It covers the strict default and its message, local mode, local mode with a shared URL, an unknown mode, and the unchanged shared-URL path../scripts/reload.sh --tag probe-hq-gateboth ways in a bare checkout of this branch: unset stops at the gate with the new hint;CMUX_DEV_BACKEND_MODE=localgets past it and reaches the GhosttyKit check.Demo Video
Not a UI change.
Checklist
CONTRIBUTING.md,--help)🤖 Generated with Claude Code
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@codesmith-botwith what you need. Autofix is disabled.Summary by cubic
Adds
CMUX_DEV_BACKEND_MODE=localso a tagged reload can build in checkouts without the shared dev backend, which onlycmuxterm-hqinstalls. Previously./scripts/reload.sh --tag <tag>exited before building unless the checkout came fromcmuxterm-hqor aCMUX_DEV_BACKEND_URLwas set; local mode keeps thehttp://localhost:<port>origin tagged builds used before.remote: a missing helper still fails loudly, now with a hint naming the opt-in.CMUX_DEV_BACKEND_URL, and unknown modes are rejected.CONTRIBUTING.mdstep 3 and the--prod-authhelp text now point to local mode.Written for commit 4e2eff2. Summary will update on new commits.
Summary by CodeRabbit
New Features
CMUX_DEV_BACKEND_MODE=local, without requiring a shared backend checkout.Documentation
Tests