feat(arm): tell an ARM worker before deploying that a provider has no build for it - #370
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The UI and worker images already ran on arm64, but nothing told a Raspberry Pi user which services would work there. The catalog's platforms field was a badge nobody read: an amd64-only image deployed fine and died with "exec format error" behind a red row that explained nothing, and the compose export wrote the x86-64 build for everyone. One vocabulary for CPU architecture now lives in app/arch.py and is shared by the deploy proxy, the catalog validator, the preflight and the compose export. The preflight compares the worker's reported CPU with the entry's platforms and says, before the deploy, that the provider publishes no build for it; emulation is stated as unchecked rather than guessed, and an unknown CPU is reported as not checked, never as a pass. The compose export takes an arch so a file for an ARM box gets the right build. Android's arm64-v8a and armeabi-v7a fold to their families. A docs page explains what runs where.
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📝 WalkthroughWalkthroughThe change adds architecture normalization and compatibility checks, architecture-aware compose export, and preflight warnings for missing image builds. It centralizes image family validation and selection, packages the new module, adds ARM documentation, and introduces tests for ARM and directional 32-bit ARM support. ChangesARM architecture support
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Change: Feature Merge Risk: 🔵 Low · up to The implementation is mergeable, but correcting the ARM documentation and preflight message would prevent misleading setup guidance and contradictory compatibility output. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #370 +/- ##
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+ Coverage 95.78% 95.83% +0.04%
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Files 51 52 +1
Lines 7356 7439 +83
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+ Hits 7046 7129 +83
Misses 310 310
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32-bit ARM compatibility runs one way: a v7 board runs v5 and v6 builds, but an armv6l Pi Zero cannot run a v7 build. Folding every 32-bit variant to one family let the preflight pass a v7-only image for a v6 machine. The worker's armv6l/armv7l now folds to its variant, catalog platforms keep theirs, and the check compares in that direction. An image_by_arch override still covers its whole family, since that tag's label lies by definition.
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Inline comments:
In `@app/preflight.py`:
- Line 217: Update the supported-build message near supported_families() so the
have text preserves ARM variants, using normalized platform targets or the
original validated platform strings instead of family-only labels; ensure a
linux/arm/v7 image is displayed as linux/arm/v7 rather than 32-bit ARM.
In `@docs/arm.md`:
- Line 3: Update the opening ARM compatibility statement in the documentation to
clarify that 32-bit ARM supports only compatible service containers, while
CashPilot UI and worker images remain limited to linux/amd64 and linux/arm64.
Keep the existing supported hardware examples and image-specific constraints
consistent with this clarification.
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Dockerfile.workerREADME.mdapp/arch.pyapp/catalog.pyapp/compose_generator.pyapp/main.pyapp/preflight.pydocs/arm.mdmkdocs.ymlservices/_schema.ymltests/test_arm_first_class.py
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…e 32-bit hosts For an armv6l worker and a v7-only image the message read "no build for 32-bit ARM, only 32-bit ARM". The builds an entry has are now listed with their variant. The docs opening claimed a 32-bit box could host the UI or a worker; only the service containers with a 32-bit build run there.
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The UI and worker images already ran on arm64, but nothing told a Raspberry Pi user which services would work there. The catalog's
platformsfield was a badge nobody read: an amd64-only image deployed fine and died withexec format errorbehind a red row that explained nothing, and the compose export wrote the x86-64 build for everyone.One vocabulary for CPU architecture now lives in
app/arch.py, shared by the deploy proxy, the catalog validator, the preflight and the compose export. The preflight compares the worker's reported CPU with the entry'splatformsand says, before the deploy, that the provider publishes no build for it. It keeps the module's rule of informed consent rather than blocking, because emulation (Rosetta, binfmt) makes such an image run and the worker cannot see the host's binfmt from inside its container; that is stated as unchecked rather than guessed, and an unknown CPU is reported as not checked, never as a pass. The compose export takes?arch=so a file for an ARM box gets the right build. Android'sarm64-v8aandarmeabi-v7afold to their families. A docs page explains what runs where.Built the worker image natively for arm64 on an Apple Silicon box and imported the worker inside it: it reports aarch64 and folds it to arm64. Pairs with #369, which makes the
platformsfield true; the preflight is only as good as that field.Summary by CodeRabbit
New Features
Documentation
Tests