feat: add deterministic build support for consistent layer caching#4
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klit79 wants to merge 8 commits intospring-boot-actions:v4from
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feat: add deterministic build support for consistent layer caching#4klit79 wants to merge 8 commits intospring-boot-actions:v4from
klit79 wants to merge 8 commits intospring-boot-actions:v4from
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Experimental support for both `tools` and `layertools` for `-Djarmode` option
Add optional `deterministic` input to normalize file timestamps and
permissions in extracted Spring Boot layers. This ensures identical
file contents produce identical Docker layer hashes, enabling proper
layer caching across builds.
Changes:
- Add `deterministic` input to action.yml (default: false)
- Update spring-boot-bake.sh to pass deterministic flag
- Modify Dockerfile to normalize timestamps (202301010000.00) and
permissions (644/755) when deterministic=true
- Applied to both jarmode=tools and jarmode=layertools extraction
Benefits:
- Dramatically reduces image pull times (only changed layers download)
- Fixes issue where dependency layers re-download on every pull
- Backward compatible (opt-in feature)
- Works with all cache backends (registry, GHA, inline)
Usage:
uses: spring-boot-actions/spring-boot-bake@v4
with:
deterministic: true
- add chown 0:0 to reset ownership to root for all extracted files - update comments to reflect ownership normalization alongside timestamps and permissions - apply ownership reset in both Spring Boot 3.2+ and legacy extraction paths
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Problem
Spring Boot layer extraction creates files with random timestamps and ownership, causing Docker layer hashes to change even when dependencies are unchanged. This forces full re-downloads on every image pull.
Solution
Add
deterministic: trueoption that normalizes:Usage