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Add layer caching to speed up multi-layer OCI image rebuilds. When
enabled, pre-installed package layers are cached to disk and restored
on subsequent builds, avoiding repeated package installation.
New variables:
- OCI_LAYER_CACHE: Enable/disable caching (default "1")
- OCI_LAYER_CACHE_DIR: Cache location (default ${TOPDIR}/oci-layer-cache/${MACHINE})
Cache key is computed from:
- Layer name and type
- Sorted package list
- Package versions from PKGDATA_DIR
- MACHINE and TUNE_PKGARCH
Cache automatically invalidates when:
- Package versions change
- Layer definition changes
- Architecture changes
Benefits:
- First build: ~10-30s per layer (cache miss, packages installed)
- Subsequent builds: ~1s per layer (cache hit, files copied)
- Shared across recipes with identical layer definitions
Build log shows cache status:
NOTE: OCI Cache HIT: Layer 'base' (be88c180f651416b)
NOTE: OCI: Pre-installed packages for 3 layers (cache: 3 hits, 0 misses)
Also adds comprehensive pytest suite for multi-layer OCI functionality
including tests for 1/2/3 layer modes and cache behavior.
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
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