feat: add LFS snapshot support to git strategy#191
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Adds a parallel cachew-native LFS caching path alongside the primary
cigitcache integration. When lfs-snapshot-enabled = true in the git
strategy block, cachew runs git lfs fetch after each snapshot generation
and archives the resulting .git/lfs/ tree as a separate
lfs-snapshot.tar.zst, served at GET /git/{host}/{path}/lfs-snapshot.tar.zst.
The archive stores paths relative to .git/ (./lfs/objects/xx/yy/sha256)
so the blox client can extract it directly into the repo's .git/ directory.
Changes:
- snapshot.CreateSubdir: new helper that archives a named subdirectory
within a parent dir, preserving the subdir prefix in tar paths.
- Strategy.generateAndUploadLFSSnapshot: clones the mirror to a temp dir,
injects a short-lived GitHub App token into the remote URL, runs
git lfs fetch origin HEAD, then calls CreateSubdir on .git/lfs/.
- Strategy.handleLFSSnapshotRequest: serves cached LFS archives via the
existing serveCachedArtifact helper (304 / 200 / 404 behaviour).
- Config.LFSSnapshotEnabled: opt-in per-repo config flag (default false).
- Schedule LFS jobs on the same interval as git snapshots.
This is the fallback path for repos or branches not covered by cigitcache.
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When
lfs-snapshot-enabled = truein the git strategy block, cachew generates a separate LFS object archive on each snapshot interval, served atGET /git/{host}/{path}/lfs-snapshot.tar.zst.After each git snapshot,
generateAndUploadLFSSnapshotclones the mirror into a temp dir, injects a short-lived GitHub App token, runsgit lfs fetch origin HEAD, then archives the resulting.git/lfs/tree. Paths inside the archive are stored relative to.git/(i.e../lfs/objects/xx/yy/sha256), so a client can extract directly into the repo's.git/directory. The archive is served via the existingserveCachedArtifacthelper with standard 200/304/404 behaviour.A new
snapshot.CreateSubdirhelper in the snapshot package supports archiving a named subdirectory within a parent directory while preserving the subdirectory prefix in tar paths.LFS snapshot jobs run on the same periodic schedule as git snapshots and are registered for both newly cloned repos and repos discovered on startup.