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The upgrade path held the whole release artifact in memory twice over: the tarball was buffered into a Bytes and copied into a Vec, then the ~270 MB uncompressed binary was read into another Vec that doubles while growing, with the tarball still alive. On a 1 GB host running the server the peak does not fit, the kernel starts swap thrashing and the machine stops answering SSH. Download now streams to a temporary file next to the target binary, feeding the SHA256 in the same pass so the digest is available without a second read. Extraction gunzips and untars from that file straight into the staging file the atomic rename already consumed. Peak memory is one copy buffer. Checksum verification still happens before anything is unpacked, which is why the tarball is staged to disk instead of piped directly into the untar. The staging file keeps its PID suffix and the rename stays atomic; both are now preceded by an fsync, and the extracted size is compared against the tar header's declared size so a truncated read cannot land over the live executable.
📓 Changelog previewThis is what your commits will add to the generated ## [Unreleased]
### Fixed
- **cli:** Validate the extracted upgrade entry and clean up staged writes
### Performance
- **cli:** Stream the upgrade download and extraction to disk
### Refactor
- **cli:** Take &Path in replace_binary
### Styling
- **cli:** Apply rustfmt to the streaming upgrade helpers |
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📝 WalkthroughWalkthroughThe upgrade command now streams OSS and EE tarballs to disk, verifies computed checksums, extracts binaries into staged files, fsyncs outputs, and atomically replaces installed binaries. Temporary-file cleanup and staged replacement behavior are covered by tests. ChangesUpgrade installation
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🔵 Low · up to The upgrade flow now streams artifacts to disk, greatly reducing memory pressure, but archive validation can still accept an invalid Sequence Diagram(s)sequenceDiagram
participant UpgradeCommand
participant DownloadEndpoint
participant DownloadedTarball
participant ChecksumVerifier
participant StagedBinary
participant InstalledBinary
UpgradeCommand->>DownloadEndpoint: request upgrade asset
DownloadEndpoint->>DownloadedTarball: stream tarball and compute hash
UpgradeCommand->>ChecksumVerifier: verify computed checksum
UpgradeCommand->>DownloadedTarball: extract temps entry
DownloadedTarball->>StagedBinary: write and sync binary
UpgradeCommand->>InstalledBinary: atomically replace binary
Suggested reviewers: Poem
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✨ Finishing Touches 💡 1🛠️ Fix failing CI checks 💡
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Clippy did flag one thing in this diff on the previous commit, a Generated by Claude Code |
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@coderabbitai review The earlier run was rate limited before it produced findings; requesting it now against fbfe9bb. Generated by Claude Code |
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Inline comments:
In `@crates/temps-cli/src/commands/upgrade.rs`:
- Around line 1483-1502: Update replace_binary to guard tmp_path with the
existing ScopedTempFile cleanup mechanism used by the streaming paths, ensuring
write_all or sync_all failures remove the staged file while preserving
finalize_staged_binary behavior on success.
- Around line 1330-1358: Use the tar entry’s Entry::size() value rather than
entry.header().size() when validating extracted bytes, preserving PAX and
sparse-entry semantics. Reject any zero-byte entry before the staged binary is
finalized or renamed, removing the staged destination first and returning an
error. Apply this in the extraction flow surrounding finalize_staged_binary.
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crates/temps-cli/src/commands/upgrade.rs
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…ites Compare the copied byte count against Entry::size rather than Header::size: the former is what the entry reader yields and honours a PAX size override, while the latter reports the logical size and disagrees for PAX and sparse entries, which would surface as a truncation that never happened. Reject an entry named temps that is not a regular file, or that is empty. A symlink or an empty file carrying that name copies zero bytes and passes a 0 == 0 size check, which would rename it over the live executable. Guard the staged file in replace_binary with the same ScopedTempFile the streaming paths use, so a failed write or fsync does not leave a partial file holding the disk space needed to retry.
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Description
Summary
temps upgradeheld the whole release artifact in memory, twice over.download_assetbuffered the response into aBytesand then.to_vec()'d it, so both copies of the ~110 MB tarball were live at once.extract_binary_from_tarballread the uncompressed binary (~270 MB:.text~185 MB,.rodata~59 MB) into aVecviaread_to_end, which doubles its capacity while growing, with the tarball buffer still alive for the whole extraction.replace_binarythen handed those 270 MB tofs::write, so the page cache filled with the same amount of dirty pages on top.On a self-hosted instance with 1 GB of RAM already running
temps serve, that peak does not fit. The kernel goes into swap thrashing and, with a fraction of a vCPU available, nothing gets scheduled: the reported symptom is the whole host becoming unreachable (SSH times out during banner exchange), not just the command failing. The last line printed is "Replacing binary", because thatprintln!happens before the write.Everything now streams through disk. Nothing in the flow ever needs the artifact whole.
Measurement
Peak RSS (
VmHWMfrom/proc/self/status) of a harness running the two code paths over a synthetic 273 MB binary in a 73 MB tarball:read_to_end,fs::write)io::copy)Roughly 350 MB down to 2.5 MB, and the "before" figure is a lower bound: the harness reads the tarball once, while the real
download_assetkept theBytesand itsto_vec()copy alive simultaneously, on a tarball half again as large.Both paths produced a byte-identical binary (same SHA256).
Changes
All in
crates/temps-cli/src/commands/upgrade.rs.download_asset_to_file/download_ee_asset_to_filestream the response chunk by chunk into a temporary file and feedSha256in the same loop, returning the hex digest. No second read for the checksum.verify_computed_checksumcompares an already-computed digest against a.sha256body.verify_checksumkeeps its signature and now delegates to it, so its callers and tests are untouched.extract_binary_from_tarball_filerunsGzDecoderover the tarballFileandstd::io::copys the entry into the staging file. The in-memoryextract_binary_from_tarballstays for its other callers.std::env::temp_dir(), which is a tmpfs on many small hosts and would put those 110 MB straight back in RAM. That directory is already known-writable viacheck_write_permission.ScopedTempFileremoves the download and staging files on the ordinary failure paths. It cannot cover aSIGKILL, so reaping orphaned.temps-upgrade-*.<pid>files needs a PID liveness check and is left for a follow-up.sync_allbefore the rename, in both the streaming and thereplace_binarypaths. The rename is atomic for metadata only, so without the fsync a power cut can leave a correctly sized file of garbage where the system's executable was.Unchanged: printed messages, release artifact format, the atomic rename, and the PID suffix on the staging file.
Validation
cargo check --lib -p temps-cli: clean, no warnings.cargo test --lib -p temps-cli: 221 passed, 0 failed. The existingverify_checksumandextract_binary_from_tarballtests are unmodified and still pass.read_to_endreallocates; missingtempsentry leaves nothing staged; missing tarball names the path in the error;ScopedTempFileremoval and disarm; PID suffix on both temp paths;finalize_staged_binaryrenaming and setting mode 0755; checksum mismatch reporting both hashes.test_verify_computed_checksum_reports_both_hashes_on_mismatch.Type of change
Checklist
cargo test --lib)cargo check --libpasses with no warningsRelated issues
Reported against a self-hosted 1 GB instance upgrading on the nightly channel.
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