feat: prefix locks; a path ending in / covers everything under it (0.7.0) - #31
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A trailing slash makes a path a prefix: claim --job build dist/ covers every path under dist/, so with --job build dist/ -- make protects what it names. A claim under another job's live prefix is refused via the prefix; a prefix claim over another job's live lock is refused via that path; check reports the same via. Expired locks in the way are evicted as before; the same job may claim under its own prefix; dist without the slash is the directory entry itself and is not covered. The race closes both ways inside the transaction: prefixes above a wanted path are verified absent or unchanged, and every claim moves a directory token ref (refs/locks/dirs/<hash of the prefix>) per level above its paths by compare-and-swap from the value its snapshot saw. A prefix claim's scan of what lies under it and a path claim's check of what lies above cannot both be stale: one transaction fails, and claim and batch now re-plan from a fresh snapshot after a lost transaction, so the refusal names what actually won. Both orders are forced in the suite with the before-commit gate. The cost: one extra ref transition per directory level on every claim, and two claims under one directory may collide once and re-plan. Tokens are bookkeeping, not locks; release leaves them; doctor knows them. Version 0.7.0. BREAKING CHANGE: a trailing slash is no longer stripped by normalisation. Before, dir/file/ named the same key as dir/file; now it is the prefix of everything under dir/file. The test that asserted the old rule is replaced by the new one; every other normalisation rule is unchanged. Closes #6
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📝 SummarySummary by CodeRabbit
WalkthroughVersion 0.7.0 adds trailing-slash prefix locks. Claims detect conflicts in both directions, report covering paths with ChangesPrefix locks
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Change: Feature · Severity of issue fixed: Medium Sequence Diagram(s)sequenceDiagram
participant cmd_claim
participant plan_claim
participant commit_claims
participant transact
cmd_claim->>commit_claims: submit claim
commit_claims->>plan_claim: build conflict and token plan
plan_claim->>transact: verify and update refs
transact-->>commit_claims: commit result
commit_claims->>plan_claim: retry with refreshed snapshot
Merge Risk: 🟡 Moderate · up to The new prefix-lock feature works for separate commands, but a single batch request that mixes different jobs with overlapping paths (for example one job on 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 15.38% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 26 functions across 9 files. (4 skipped: 4 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
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Actionable comments posted: 3
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Inline comments:
In `@lib/100-batch.sh`:
- Line 22: Update plan_batch to track normalized paths and owning jobs across
all claims, rejecting ancestor or descendant overlaps when the paths belong to
different jobs while allowing overlaps within the same job. Perform this
validation before plan_batch completes, and apply equivalent cross-job overlap
validation in the bin/git-locks batch flow.
In `@test/test.sh`:
- Line 1487: Update the race-test output handling around the pre and leaf3
git-locks commands to create per-run temporary files with mktemp rather than
fixed /tmp/gl-pre.* or /tmp/gl-leaf3.* paths, use those paths for redirected
output, and remove the temporary files after the test completes.
- Line 1489: Replace the fixed sleep in the competing-claim test with a
readiness handshake: update the pause hook to create a separate marker after the
transaction has been planned, then wait for that marker before launching the
competing claim. Preserve GATE7 and GATE8 as the release gates and retain the
existing gate synchronization.
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📒 Files selected for processing (13)
CHANGELOG.mdREADME.mdbin/git-lockslib/000-prelude.shlib/030-time-refs-records.shlib/060-the-transition-plan.shlib/070-refusals.shlib/090-claim-planning.shlib/100-batch.shlib/120-check.shlib/175-doctor.shschema/git-locks.schema.jsontest/test.sh
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🧰 Additional context used
🪛 ast-grep (0.45.3)
test/test.sh
[warning] 1486-1486: Writing to or reading from a hardcoded, predictable path under /tmp is vulnerable to symlink and TOCTOU attacks: a local attacker can pre-create the file (or a symlink pointing elsewhere) and hijack or corrupt the contents. Generate a unique, unpredictable temporary file with mktemp instead, e.g. tmpfile="$(mktemp)" (or mktemp -d for directories) and reference "$tmpfile".
Context: /tmp/gl-pre.out
Note: [CWE-377] Insecure Temporary File.
(predictable-tmp-file-bash)
[warning] 1486-1486: Writing to or reading from a hardcoded, predictable path under /tmp is vulnerable to symlink and TOCTOU attacks: a local attacker can pre-create the file (or a symlink pointing elsewhere) and hijack or corrupt the contents. Generate a unique, unpredictable temporary file with mktemp instead, e.g. tmpfile="$(mktemp)" (or mktemp -d for directories) and reference "$tmpfile".
Context: /tmp/gl-pre.err
Note: [CWE-377] Insecure Temporary File.
(predictable-tmp-file-bash)
[warning] 1494-1494: Writing to or reading from a hardcoded, predictable path under /tmp is vulnerable to symlink and TOCTOU attacks: a local attacker can pre-create the file (or a symlink pointing elsewhere) and hijack or corrupt the contents. Generate a unique, unpredictable temporary file with mktemp instead, e.g. tmpfile="$(mktemp)" (or mktemp -d for directories) and reference "$tmpfile".
Context: /tmp/gl-pre.err
Note: [CWE-377] Insecure Temporary File.
(predictable-tmp-file-bash)
[warning] 1501-1501: Writing to or reading from a hardcoded, predictable path under /tmp is vulnerable to symlink and TOCTOU attacks: a local attacker can pre-create the file (or a symlink pointing elsewhere) and hijack or corrupt the contents. Generate a unique, unpredictable temporary file with mktemp instead, e.g. tmpfile="$(mktemp)" (or mktemp -d for directories) and reference "$tmpfile".
Context: /tmp/gl-leaf3.out
Note: [CWE-377] Insecure Temporary File.
(predictable-tmp-file-bash)
[warning] 1501-1501: Writing to or reading from a hardcoded, predictable path under /tmp is vulnerable to symlink and TOCTOU attacks: a local attacker can pre-create the file (or a symlink pointing elsewhere) and hijack or corrupt the contents. Generate a unique, unpredictable temporary file with mktemp instead, e.g. tmpfile="$(mktemp)" (or mktemp -d for directories) and reference "$tmpfile".
Context: /tmp/gl-leaf3.err
Note: [CWE-377] Insecure Temporary File.
(predictable-tmp-file-bash)
[warning] 1509-1509: Writing to or reading from a hardcoded, predictable path under /tmp is vulnerable to symlink and TOCTOU attacks: a local attacker can pre-create the file (or a symlink pointing elsewhere) and hijack or corrupt the contents. Generate a unique, unpredictable temporary file with mktemp instead, e.g. tmpfile="$(mktemp)" (or mktemp -d for directories) and reference "$tmpfile".
Context: /tmp/gl-leaf3.err
Note: [CWE-377] Insecure Temporary File.
(predictable-tmp-file-bash)
🪛 LanguageTool
README.md
[grammar] ~416-~416: Ensure spelling is correct
Context: ...ads the reason and not only the name. A ttl is a decimal number of seconds; a leadi...
(QB_NEW_EN_ORTHOGRAPHY_ERROR_IDS_1)
🔇 Additional comments (9)
CHANGELOG.md (1)
7-16: LGTM!README.md (1)
350-350: LGTM!Also applies to: 390-390, 416-416
lib/060-the-transition-plan.sh (1)
49-49: LGTM!lib/070-refusals.sh (1)
3-12: LGTM!lib/175-doctor.sh (1)
149-149: LGTM!lib/000-prelude.sh (1)
63-63: LGTM!Also applies to: 90-91, 97-98
lib/030-time-refs-records.sh (1)
55-60: LGTM!Also applies to: 81-84, 86-106
schema/git-locks.schema.json (1)
73-73: LGTM!Also applies to: 107-109, 156-160, 315-317, 1080-1083
lib/120-check.sh (1)
6-20: LGTM!Also applies to: 28-34, 43-79
…hedules handshake From the review of #31, tests first: - Two records of one batch could claim a prefix and a path under it for different jobs and both land. Neither sees the other: they plan against one snapshot, and the ancestor verify of one is absorbed by the create of the other (plan_set sharpens a verify into a change). Overlap inside a batch is now decided while planning, between different jobs only, as a duplicate refusal naming the path and the record that covers it; the batch lands nothing. One job may still hold a prefix and a path under it. - The forced-schedule tests slept a second and hoped the paused command had got to its gate. test_gate now writes <gate>.ready before waiting, and every such test waits for that marker, so the racer cannot win before the paused command has read and planned. Without it, those tests could pass without exercising the stale plan at all. - No test writes to a fixed /tmp path; each background command gets its own mktemp file.
All three findings fixed in 06c2333 with tests written first; each thread replied to and resolved. CI green, 452 checks.
1 participant
Roadmap item 5 (#6), the last of the five.
A trailing slash makes a path a prefix.
claim --job build dist/covers every path underdist/, sowith --job build dist/ -- makeprotects what it names. A claim under another job's live prefix is refusedviathe prefix; a prefix claim over another job's live lock is refusedviathat path (one refusal line per covering lock);checkreports the samevia. Expired locks in the way are evicted as before. The same job may claim under its own prefix.distwithout the slash is the directory entry itself and is not covered.How the race closes
Two claims whose reads could not see each other must not both land: a prefix claim scanning what is under it, and a path claim checking what is above it. Inside the transaction:
verify <ref>with no old value), the job's own, expired (evicted), or another job's live lock (refused);refs/locks/dirs/<hash of the prefix>, for each level above its paths (and the wanted prefix itself) by compare-and-swap from the value its snapshot saw; in a batch the token moves once.So one of the two transactions fails.
claimandbatchnow re-plan from a fresh snapshot after a lost transaction, up to the usual retry bound, so the loser's refusal names what actually won (withviaandnote) rather than quoting git. Both orders are forced in the suite with the before-commit gate: the prefix claim paused while a path lands under it, and the path claim paused while a prefix lands over it.Cost: one extra ref transition per directory level on every claim; two claims under one directory can collide once and re-plan. Tokens are bookkeeping, not locks: release leaves them,
doctorknows them, and the suite counts them separately from lock refs. Measured on 200 locks three directories deep:claim0.38 s,check0.23 s,list0.33 s (macOS, bash 5.3).The one policy change
Normalisation no longer strips a trailing slash; that is the prefix marker. Before,
dir/file/named the same key asdir/file; now it asks about, or claims, everything underdir/file. The test that asserted the old rule is replaced by the new one (the README's contract paragraph said the old policy was "stated, not an omission"; #6 is the decision that changed it). Every other normalisation rule is unchanged:dir//and./dir/./are the prefixdir/.Schema:
viaon the heldcheck_lineand the heldrefusal_line; thepathdescription states the prefix rule. Tests written first: 26 RED, then 441 green, lint clean. Version 0.7.0, with aBREAKING CHANGEfooter on the commit for the slash rule; under 0.x this ships as a minor bump.Closes #6