feat(fs): read archives through the one read path - #21
Conversation
Zip, tar, and gzipped tar are recognized by their magic bytes — never their extensions — and render as an entry listing like a directory read. Passing `entry` extracts one member instead, rendered as hashline text like any file. Everything is bounded: the listing caps its entry count with the true total reported, and extraction caps its bytes while streaming, so a small archive that inflates enormously stops at the cap instead of filling memory — zip bombs stay in the bottle. Co-Authored-By: Claude <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01KoSjfcJPjXpkVLTS2Vxwwr
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📝 WalkthroughWalkthroughThe tools package adds ZIP, TAR, and TAR.GZ archive support. ChangesArchive-aware read flow
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟠 High · up to Archive reads can currently decompress and scan unbounded TAR/TAR.GZ contents and produce responses beyond the intended size limit, creating a risk of excessive resource use; detection can also block async workers, and gzip-compressed text may be rejected instead of read normally. The PR is not merge-ready until these boundedness, runtime, and classification issues are addressed. Sequence Diagram(s)sequenceDiagram
participant Caller
participant ReadFileRun as ReadFile::run
participant Archive as archive
Caller->>ReadFileRun: path and optional entry
ReadFileRun->>Archive: detect path
alt entry omitted
ReadFileRun->>Archive: list archive
Archive-->>ReadFileRun: archive listing
else entry provided
ReadFileRun->>Archive: read_entry
Archive-->>ReadFileRun: bounded entry bytes
ReadFileRun-->>Caller: hashline-rendered content
end
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches📝 Generate docstrings
🧪 Generate unit tests (beta)
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🤖 Lab Code Review (draft opinion)I'll review this PR for correctness, security, and data-loss risks, focusing on the most severe issues first. Findings1. Security: Potential path traversal in tar archive extractionFile: The tar extraction code uses Fix: Normalize and validate paths to prevent directory traversal: let member_path = member.path().map_err(|e| arch_err(path, e))?;
let normalized = member_path.display().to_string();
// Add validation: ensure path doesn't contain parent directory references
if normalized.contains("..") || normalized.starts_with('/') || normalized.contains("//") {
continue; // Skip this entry as it's potentially dangerous
}
if normalized == entry {
return bounded_read(member).map_err(|e| arch_err(path, e));
}2. Correctness: Inconsistent error handling for corrupted archivesFile: The code uses Fix: Apply consistent error conversion across all archive operations: // In zip_archive function:
zip::ZipArchive::new(file).map_err(|e| arch_err(path, e))?
// In tar_archive function:
Ok(tar::Archive::new(reader).map_err(|e| arch_err(path, e))?)3. Correctness: Unbounded memory usage in archive listingFile: While the listing caps displayed entries at Fix: Limit collection during iteration: // Replace:
let mut entries = Vec::new();
for i in 0..archive.len() {
// ... push all entries
}
entries
// With:
let mut entries = Vec::with_capacity(MAX_ENTRIES);
for i in 0..archive.len().min(MAX_ENTRIES + 1) {
// ... push entries
}
// Still need total count for reporting, so keep separate counter4. Correctness: Missing validation for empty entry namesFile: The tar extraction loop doesn't validate that entry names are non-empty before comparison. An empty or invalid entry name could cause unexpected behavior or match incorrectly. Fix: Add validation for empty entry names: let member_path = member.path().map_err(|e| arch_err(path, e))?;
let entry_name = member_path.display().to_string();
if entry_name.is_empty() {
continue; // Skip invalid entries
}
if entry_name == entry {
return bounded_read(member).map_err(|e| arch_err(path, e));
}5. Simplification: Redundant cloning in archive handlingFile: The code clones the Fix: Remove the redundant clone: return tokio::task::spawn_blocking(move || match entry {
None => crate::archive::list(&path, kind),
Some(entry) => {
// ... rest unchanged
}
}); |
Review follow-ups on the archive reader: the listing now keeps at most its cap of entries while it scans — a million-member archive costs a count, not a vector — with the true total still reported; an empty `entry` is rejected as invalid input up front instead of falling through to a not-found miss; and the read path moves into the blocking task instead of being cloned, in both the SQLite and archive branches. Co-Authored-By: Claude <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01KoSjfcJPjXpkVLTS2Vxwwr
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Addressed the lab review in 5d3cd9c — three findings fixed, two don't hold up against the code: Fixed:
Not applicable:
All gates re-run green: fmt, clippy Generated by Claude Code |
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Actionable comments posted: 4
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Inline comments:
In `@crates/tools/src/archive.rs`:
- Around line 38-40: Update the archive-kind detection around the gzip
magic-byte check to decompress the candidate stream and validate it as a TAR
archive before returning Kind::TarGz; otherwise continue with normal file
classification. Add a regression test covering gzip-compressed text and ensure
it is not classified as Kind::TarGz.
- Around line 74-84: The archive listing flow around list and render must
enforce both a decompressed scan-byte budget and a rendered-output byte budget,
including TAR.GZ payload scanning. Stop iterating when either limit is reached,
return a clear partial-result or failure response, and avoid reporting a
complete total when truncated; ensure the final listing output itself cannot
exceed MAX_READ_BYTES.
In `@crates/tools/src/fs.rs`:
- Line 105: Update the code around archive::detect to run archive detection
within blocking work rather than directly on the async worker; preserve the
existing conditional handling of the detected kind and path while ensuring the
synchronous file read cannot block the async runtime.
In `@README.md`:
- Line 133: Update the read_file description in the README archive formats list
to explicitly include TAR.GZ alongside zip and tar, preserving the existing
behavior and wording for the other supported inputs.
🪄 Autofix
Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
ℹ️ Review info
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Review profile: CHILL
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⛔ Files ignored due to path filters (1)
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📒 Files selected for processing (7)
Cargo.tomlREADME.mdcrates/tools/Cargo.tomlcrates/tools/src/archive.rscrates/tools/src/fs.rscrates/tools/src/lib.rsdocs/TOOLS.md
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…async worker Four review findings on the archive reader, each real: - Tar and tar.gz scans now draw from one 64 MiB decompressed-byte budget — headers plus the payloads the iterator skips over — so a small gzip bomb stops at the budget instead of costing unbounded CPU. A capped listing reports "N+ entries" and says it is incomplete; a capped entry search fails naming the budget. - The rendered listing is itself bounded (truncate_middle), so long member names cannot push the output past the transcript caps. - A gzip stream is classified tar.gz only when its *decompressed* head carries the tar magic; plain gzip text now decompresses and renders as hashline text instead of failing as a malformed archive. - The SQLite/archive content probes moved into blocking work, so their synchronous head-reads cannot stall an async runtime worker. Co-Authored-By: Claude <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01KoSjfcJPjXpkVLTS2Vxwwr
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All four CodeRabbit findings verified and fixed in 0f6231a:
Gates re-run green: fmt, clippy Generated by Claude Code |
2 participants
The last light decoder in the
readseries (files → directories → URLs → SQLite → now archives).read_fileon a zip, tar, or gzipped tar — recognized by magic bytes (PKheaders, gzip's1f 8b,ustarat offset 257), never extension — renders an entry listing like a directory read: names, sizes, directories with trailing slashes. Passingentryextracts one member instead, rendered as ordinary hashline text.Bounded on purpose:
as and asserts the read stops exactly at the cap with a clipped marker.A missing entry is an
InvalidInputpointing back at the listing, not a guess. Misleading extensions go both ways in the tests: a zip named.txtreads as an archive, a text file named.zipreads as text.Deps:
zip(default-features off, deflate only),tar,flate2— all pure Rust.Validation: unit tests for detection, listings, extraction, caps, and misses on all three formats, plus an integration test through
read_file(listing → entry as hashline). Full gates green ×2 — fmt, clippy-D warnings, workspace tests (200 tests).🤖 Generated with Claude Code
https://claude.ai/code/session_01KoSjfcJPjXpkVLTS2Vxwwr
Generated by Claude Code
Summary by CodeRabbit
New Features
read_filefor ZIP, TAR, and TAR.GZ files.Documentation