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fix(mount): tolerate ACL-filtered undercounts in complete-v1 verify - #536
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complete-v1 snapshot verification compared the caller-visible fs/tree count against the raw manifest's filesExpected. On workspaces whose ACL denies reads for some snapshot files (e.g. AgentWorkforce/cloud's root `/.relayfile.acl` denying `**/credentials*`), the tree legitimately shows fewer entries than the manifest counted, and both the tar-seed and full-tree verification hard-failed forever — the mount could never converge. Both paths now distinguish overcount from undercount: - Overcount always fails (server returned more than the manifest). - Undercount requires explicit ACL evidence: a `.relayfile.acl` marker visible inside the listed subtree, or a successful/403 marker probe on the contents root or its ancestors. 403 counts as evidence because the read was enforced. Other probe errors fail closed. - With evidence, verification continues strictly: every listed file is still content-verified (tar bytes or per-file pull), so a broken projection cannot silently materialize a partial tree.
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📝 WalkthroughWalkthroughGitHub tar seeding and strict ChangesACL-filtered tree counts
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Bug fix Suggested reviewers: Merge Risk: 🟡 Moderate · up to Snapshot verification can accept an incomplete mount based on an unrelated ACL rule. It can also reject a valid ACL-filtered mount when many markers exist, or when an ACL marker file is counted as a manifest file. Resolve these issues before merging. Security Architecture ReviewSecurity architecture risk: 🟡 Moderate · up to ACL-aware verification addresses a legitimate synchronization failure, but the evidence accepted by the new exception does not necessarily explain the missing files. An incomplete local snapshot may now be accepted. Existing read authorization, content validation, and deletion safeguards limit the exposure. Retained concerns
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| ) | ||
| }() | ||
| remotePaths := map[string]struct{}{} | ||
| traversalSawAclMarker := false |
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When the fallback traversal exceeds the per-cycle file budget (2,000 by default) and a nested live ACL marker is consumed in an earlier Reconcile, this local flag resets to false on the final resumed call even though BootstrapStrictFilesSeen persists. workspaceAclMayFilterView then probes only the contents root and its ancestors, so it cannot rediscover that nested marker and rejects the legitimate undercount indefinitely; persist the marker evidence alongside the traversal checkpoint.
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| if !aclMayFilter { | ||
| return countErr | ||
| } | ||
| s.logf("complete-v1 github tree listed %d of %d manifest files; workspace ACL markers filter this caller's view", strictFilesSeen, expectedFiles) |
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When an ACL hides every manifest file, this branch correctly accepts the 0 < filesExpected undercount, but the immediately following empty-tree guard still returns EmptyRemoteTreeError because remotePaths is empty and the manifest count is nonzero. The full-tree fallback therefore still cannot bootstrap a caller with no visible files; carry the accepted ACL-filtered state into that guard.
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| aclMayFilter, aclErr := s.workspaceAclMayFilterView(ctx, s.githubWorkingTree.ContentsRoot, aclMarkerSeen) | ||
| if aclErr != nil { | ||
| return true, fmt.Errorf("%w; acl marker probe failed: %v", countErr, aclErr) | ||
| } | ||
| if !aclMayFilter { | ||
| return true, countErr | ||
| } | ||
| s.logf("github tar seed: tree listed %d of %d manifest entries; workspace ACL markers filter this caller's view — continuing with strict tar verification", len(tree), *manifest.FilesExpected) |
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🔴 Unrelated ACL marker admits partial snapshots
When a visible file disappears from ListTree despite an unrelated ACL marker, the undercount passes verification. A matching partial tar then completes bootstrap without that file, and later audits can delete its local copy.
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The clone manifest counts the full imported working tree. A workspace ACL marker can hide some entries, but its mere presence does not establish which entries were hidden. Here an unrelated marker lets any short tree pass the manifest comparison. The strict archive check later compares only against githubWorkingTreeSnapshot, not the complete manifest. The bounded-tree path makes the same assumption at the strict count check.
Example: The manifest expects README.md and app.ts. A marker denies only private/**, while a faulty listing omits app.ts. A tar containing only README.md matches that listing, so bootstrap completes without app.ts although this caller can read it.
Recommended fix: Use an authoritative ACL-filtered expected count or a manifest of expected paths filtered with the caller's actual permissions. Compare the verified visible tree against that filtered expectation on both seed and bounded-tree paths; marker presence alone cannot prove the missing count is ACL-related.
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| // An undercount is only legitimate when workspace ACL markers can hide | ||
| // part of the caller's view — every listed file was still verified | ||
| // against the snapshot above. | ||
| aclMayFilter, aclErr := s.workspaceAclMayFilterView(ctx, s.githubWorkingTree.ContentsRoot, traversalSawAclMarker) |
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🔴 Resumed bootstrap loses nested ACL evidence
When pullRemoteFullTree resumes after passing a nested ACL marker, traversalSawAclMarker resets while the file count persists. The ancestor probe cannot find that marker, so the valid undercount blocks bootstrap.
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A bounded bootstrap can stop mid-tree and persist its cursor and strict file count in persistTraversal. Each invocation initializes traversalSawAclMarker to false. Only entries visited in the final invocation set it, while workspaceAclMayFilterView probes the contents root and ancestors, not previously visited nested directories.
Example: The first cycle visits contents/private/.relayfile.acl and reaches its file budget. A later cycle drains the tree, seeing fewer files than the manifest but no further markers. If no ancestor marker exists, every probe returns 404 and bootstrap fails indefinitely.
Recommended fix: Persist the nested-marker evidence alongside BootstrapStrictFilesSeen and the traversal cursor. Reset it on a fresh traversal or invalid-cursor restart, and use the persisted value when verifying the completed traversal.
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| aclMayFilter, aclErr := s.workspaceAclMayFilterView(ctx, s.githubWorkingTree.ContentsRoot, traversalSawAclMarker) | ||
| if aclErr != nil { | ||
| return fmt.Errorf("%w; acl marker probe failed: %v", countErr, aclErr) | ||
| } | ||
| if !aclMayFilter { | ||
| return countErr | ||
| } | ||
| s.logf("complete-v1 github tree listed %d of %d manifest files; workspace ACL markers filter this caller's view", strictFilesSeen, expectedFiles) |
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🔴 Fully filtered tree cannot finish bootstrap
When ACLs hide every contents file, workspaceAclMayFilterView accepts the zero count, but the empty-tree guard rejects it. The bounded fallback repeatedly fails bootstrap despite a legitimate empty view.
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The strict count can now accept zero caller-visible entries even when the manifest expects files. Immediately afterward, the empty-tree guard rejects an empty remotePaths map for a GitHub mount with a positive manifest count. This affects the resumable bounded-tree fallback whenever the tar seed is unsupported or fails.
Example: A manifest outside contents declares three files, and an ancestor ACL marker denies reads to all three. ListTree(contents) returns no files. The marker probe succeeds, yet the fallback returns EmptyRemoteTreeError on every completed traversal.
Recommended fix: Carry the verified ACL-backed zero-count decision into the empty-tree guard. Keep the guard for empty listings without verified ACL evidence and for other mount types.
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Actionable comments posted: 1
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @internal/mountsync/syncer.go:
- Line 7792: Persist traversalSawAclMarker in the traversal checkpoint alongside
BootstrapStrictFilesSeen so resumed cycles retain descendant ACL-marker
evidence; clear it when traversal restarts from the root.
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internal/mountsync/syncer.gointernal/mountsync/syncer_test.go
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All reported issues were addressed across 2 files
Reply with feedback, questions, or to request a fix.
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Addresses review findings on the undercount tolerance:
- Marker presence alone was too weak: a marker is now evidence only when
its read proves ACL enforcement. Each observed/ancestor marker is
re-read; a 403 counts (the read itself was enforced), and a readable
marker must carry a deny rule with a read/manage/* action whose path
glob intersects the mounted subtree. Rules are extracted from both
marker body shapes (newline-delimited text and the bulk-write
{"semantics":{"permissions":[...]}} JSON blob). A write-only or
unrelated-subtree marker no longer admits a partial tree.
- Marker evidence now persists across resumable bootstrap cycles in
state.bootstrapAclMarkers alongside bootstrapStrictFilesSeen, so a
resume that starts after the marker's page keeps the undercount
justification. Reset everywhere the strict counter resets.
- A fully filtered view (0 visible files) no longer trips the empty-tree
guard after its undercount is ACL-justified — aclFilteredUndercount
carries the decision past the EmptyRemoteTreeError check.
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Actionable comments posted: 3
- 🪄 Fix CodeRabbit comments on this PR
🤖 Prompt to fix review comments
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only still-valid issues, skip the rest with a brief reason, keep changes
minimal, and validate.
Inline comments:
Review comments at @internal/mountsync/syncer.go:
- Line 7237: Update the marker evidence collectors governed by
aclMarkerEvidenceLimit so the first eight write-only or unrelated markers cannot
exclude a later nested read-deny marker; keep probe work bounded while allowing
relevant evidence beyond the initial eight candidates.
- Line 7322: Update the strings.HasPrefix check in the ACL marker rule matching
logic so a literalPrefix extending beyond normalizedRoot is accepted only when
the next character is a path boundary, preventing sibling paths from matching.
Add a sibling-path case to TestAclMarkerDeniesReadUnder.
- Line 8191: Update the strict manifest counting condition that increments
strictFilesThisChunk to exclude paths whose basename is
relayfile.DirectoryPermissionMarkerFile. Preserve the existing source,
entry-type, and runtimeRoot checks for all other files and symlinks.
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internal/mountsync/syncer.gointernal/mountsync/syncer_test.go
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Second review round:
- RemoteFile now decodes `semantics` — production ACL markers keep rules
in `semantics.permissions`, not necessarily in the body. Marker probes
follow server precedence: structured semantics when populated, body
rules (text or semantics JSON blob) otherwise.
- aclMarkerRules decodes bare JSON-array bodies (the `{"` guard skipped
them before).
- Marker cap raised to 256 — the probe early-exits on first evidence, so
a tail of write-only markers can no longer hide a read-deny marker
past the limit.
- Glob literal-prefix overlap now requires a `/` boundary when the
prefix extends past the mount root, so `/repo/contents-old/**` cannot
justify an undercount under `/repo/contents`.
- Live `.relayfile.acl` rows no longer increment strictFilesSeen — they
are not manifest entries, and counting them masked missing files or
forced false overcounts on subtrees with nested markers.
1 participant
Summary
complete-v1snapshot verification compared the caller-visiblefs/treecount against the raw manifest'sfilesExpected. On workspaces whose ACL denies reads for some snapshot files (e.g.AgentWorkforce/cloud's root/.relayfile.acldenying**/credentials*), the tree legitimately shows fewer entries than the manifest counted, and both the tar-seed and full-tree verification hard-failed forever — the mount could never converge..relayfile.aclmarker visible inside the listed subtree, or a successful/403 marker probe on the contents root or its ancestors.403counts as evidence because the read was enforced; other probe errors fail closed.Companion to relayfile-cloud PR #311, which makes the merged tar export ACL-filter the same way (deny → filtered fall-through instead of hard-403).
Test plan
TestPullRemoteFullGithubTarSeedToleratesAclFilteredCount— undercount + ancestor marker probe evidence → seeds cleanlyTestPullRemoteFullGithubTarSeedRejectsUndercountWithoutAclMarkers— undercount, no markers → hard fail before tar exportgo test ./internal/mountsync— full suite greengofmtcleanGenerated with Devin
Note
Medium Risk
Changes complete-v1 mount verification and ACL interpretation; behavior is intentionally fail-closed on probe failures, but incorrect marker matching could allow a partial tree or block legitimate mounts.
Overview
complete-v1 GitHub snapshot checks no longer treat every
filesExpectedundercount as corruption when workspace ACL can hide files from the caller.Overcounts still fail immediately. Undercounts only proceed after
workspaceAclMayFilterViewfinds real read-deny evidence:.relayfile.aclpaths seen during listing (persisted asBootstrapAclMarkersfor resumable bootstrap) and/or ancestor marker probes viaReadFile(403 counts as enforcement; other errors fail closed). Rules are parsed from marker body text or from newRemoteFile.Semantics.Permissions. Live ACL markers are excluded from the strict file counter so they do not mask missing snapshot files.The same logic applies on tar-seed tree verification and on bounded bootstrap traversal end checks; listed files remain strictly content-verified either way.
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