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The registry never reclaims blobs, so its store grows until the disk fills and the nightly builds fail with "no space left on device". Add registry-gc.sh, run weekly (Sunday 08:00), plus a daily dangling-image prune.
registry-gc.sh refuses to run while a build is active, stops the registry for a stable blob graph, deletes only untagged manifests (-m) and their blobs, restarts via an EXIT trap, and verifies a tag still pulls.
distribution 2.8.x GC does not follow OCI image indexes, so -m deletes their child manifests (distribution#3178). Default BuildKit provenance made every pushed tag an OCI index, which made -m destructive. Build scripts now pass --provenance=false (plain schema2), and registry-gc.sh refuses to run if any tag is still an index.
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Extracted from the .extras/ dir of the sbo-slackbuilds package repo, where it
grew from a throwaway helper into a standalone tool. Git history starts fresh;
the original 41-commit development log is preserved in HISTORY.md.
Contents: the test-build CLI (resolves a local SlackBuild's deps from a
configured SBo tree and builds it in a throwaway container, lints, caches deps),
the image-builder chain that produces the images it consumes, their pure-logic
self-checks, design specs/plans, an install.sh for ~/bin, and docs.
Licensed GPLv2-only.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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