Build checkpoint subtree paths via path.Join helper (no tree change)

4adc0c1·

Soph·2w ago·2 files·+117 added/-66 removed

A reviewer flagged fmt.Sprintf("%s%d/%s", basePath, idx, paths.MetadataFileName)
as looking like a missing slash — it's correct only because basePath carries a trailing "/". Replace the string-concat path construction with a
checkpointSubtreePath(base, segs...) helper over stdlib path.Join, so paths join
correctly without relying on that invariant.

• Helper uses the path package (NEVER path/filepath — git tree paths are always "/"; filepath.Join would emit "\" on Windows and corrupt tree keys). path.Join cleans separators, so base may be "" (ref root), "//" (v1, trailing slash), or a clean dir — all join identically.
• Converted every full-path site and routed the directory-prefix intermediates through the helper as CLEAN dirs (sessionDir, taskDir), updating their consumers (writeSessionToSubdirectory, writeTranscript, writeCompactTranscript, replaceTranscript, replaceSkillEvents, copyMetadataDir, writeTaskCheckpoint*).
• The two prefix-scoping deletes that relied on the trailing slash now append it explicitly: HasPrefix(key, sessionDir+"/") (so "1" doesn't match sibling "10") and the transcript chunk cleanup. Leading-slash SessionFilePaths values become "/" + checkpointSubtreePath(...).

No behavior change: committed-tree assertions (checkpoint write/read, tripwire, update), integration (378), and both canary modes (git-branch 59/59, git-refs 58/59 +1 skip) are unchanged.

Co-Authored-By: Claude Opus 4.8 (1M context) noreply@anthropic.com

Sessions

973f8248e820View transcript

Changes

2

• cmd/entire/cli/checkpoint

• Mpersistent.go+84/-66

• Asubtree_path_test.go+33

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"io"
    "log/slog"
    "os"
    "path"
    "path/filepath"
    "sort"
    "strconv"
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return subtree, nil
}

// checkpointSubtreePath joins a checkpoint-relative git tree path from a base and
// trailing segments using path.Join. Git tree paths are always "/"-separated, so
// this uses the stdlib path package (never path/filepath, which would emit "\\" on
// Windows and corrupt tree keys). path.Join cleans separators, so base may be ""
// (per-checkpoint-ref root), a clean dir ("a3/b2.../0"), or a trailing-slash dir
// ("a3/b2..."): checkpointSubtreePath("", "0", "metadata.json") == "0/metadata.json"
// and checkpointSubtreePath("a3/b2.../", "0", "metadata.json") == "a3/b2.../0/metadata.json".
// Callers therefore need not maintain the trailing-slash invariant by hand.
func checkpointSubtreePath(base string, segs ...string) string {
    return path.Join(append([]string{base}, segs...)...)
}

// flattenExisting flattens a checkpoint's current subtree into a path->entry map...
// (additional code snippets omitted for brevity)