packaging: the renderer refuses a file it cannot read instead of crashing, and resolves --out - #145
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…hing, and resolves --out An outside review of #143 found two gaps in the renderer. A --sums file that is missing, unreadable or not UTF-8 printed a Python traceback rather than saying which file and what to do. And --out was checked against the repository by its spelling, so a link or a junction leading into the tree could put rendered packages inside it. Every read now turns a system error or a decoding error into a refusal that names the file. A checksum file over a megabyte is refused before it is read - a release's is under a kilobyte, so that is another file passed by mistake. ROOT and --out are compared as resolved paths. A working folder that cannot be made, and a write that fails, are refusals too, and the working folder is still removed. A guard hands the renderer each of these - a missing file, a file that is not UTF-8, two megabytes of text, a destination through a junction into an empty folder made inside the tree for the purpose, and a destination under a file - and holds each to exit 1 with a sentence and no traceback. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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📝 WalkthroughWalkthroughThe packaging script resolves repository and output paths through symlinks, validates checksum files, and reports filesystem errors as refusals. Tests cover invalid checksum inputs, unsafe destinations, and the renderer’s checksum-file path. ChangesPackaging refusals
Priority: ⬇️ Low Estimated code review effort: 2 (Simple) | ~10 minutes Change: Bug fix Suggested labels: Merge Risk: 🔵 Low · up to Before merging, handle unreadable output folders so they produce a refusal message instead of a traceback. Bound the checksum-file read to its size limit, and add a test for a write failure. These gaps affect the internal packaging script and are limited in scope. Security Architecture ReviewSecurity architecture risk: 🟡 Moderate · up to The change blocks output paths that resolve into the repository and refuses oversized checksum files in ordinary use. A verified availability risk remains if a checksum file changes between its size check and read. The available evidence does not show that this PR introduced that unbounded read or made the file independently attacker-writable. Retained concerns Security review detailsSecurity Blast Radius
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🚥 Pre-merge checks | ✅ 11 | ❌ 3❌ Failed checks (3 warnings)
✅ Passed checks (11 passed)
Full details: Safe File ParsingExplanation
Resolution Make Full details: Clear User-Facing TextExplanation Several new refusal messages state the failure but do not tell the user what to do. For example, invalid UTF-8 produces “<path> is not UTF-8 text, so it is not a checksum file”, and creation or write failures produce “cannot create a working folder...” or “cannot write the packages... Nothing was left behind”. The generic Resolution Add an actionable instruction to each new error. For example: “The checksum file <path> is not UTF-8 text. Download verify-SHA256SUMS.txt from the release and run the command again.” Use “Check that <path> exists and is readable, then run the command again” for generic read failures. Use “Choose a writable parent directory and run the command again” for working-folder creation failures, and “Choose a writable empty directory outside the repository and run the command again” for package-write failures. Full details: Scope, Duplication And DocsExplanation The PR changes user-facing packaging behavior but does not update documentation. The changed script now refuses missing, unreadable, invalid-UTF-8, and oversized checksum files; resolves Resolution Update Comment |
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Inline comments:
In @.github/scripts/build_packages.py:
- Around line 373-374: Track whether the build flow created parent before
calling os.makedirs, and on rendering failure remove parent only if this
invocation created it and it is still empty. Preserve the existing cleanup of
work and leave pre-existing parent directories untouched.
- Line 175: Update read_sums and read_text so checksum files are opened once,
verified as regular files, and read with a limit of SUMS_LIMIT + 1 bytes before
decoding; reject files exceeding SUMS_LIMIT and remove the separate getsize
check.
- Line 352: Update check_out to catch OSError while inspecting an existing
output directory with os.path.isdir or os.listdir, and report refusal with the
inspection error instead of allowing a traceback. Preserve the existing refusal
for directories that are not empty.
In `@internal/guard/packagingrefusal_test.go`:
- Line 190: Update the junction error formatting in the test helper to include
the link and target paths and wrap the underlying err with %w, preserving the
error chain while identifying the failed link operation.
- Around line 153-164: Add a test in the packaging-refusal tests that triggers a
write or rename error after the work directory has been created. Assert the
refusal message, required exit code, and removal of the work directory so the
test covers the package-write OSError handler.
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.github/scripts/build_packages.pyinternal/guard/packaging_test.gointernal/guard/packagingrefusal_test.go
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🪛 ast-grep (0.45.3)
.github/scripts/build_packages.py
[warning] 116-116: File path is request-/variable-derived; validate and normalize to prevent path traversal.
Context: open(path, encoding="utf-8-sig")
Note: [CWE-22] Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal').
(open-filename-from-request)
…a failed run, every refusal says what to do From the review of #145. - The checksum file is opened once, refused unless it is a regular file, and read at most one byte past the limit. Asking its size first and reading it after could see two different files, and a pipe or a device has no size. read_text, which only ever reads files of this repository, no longer pretends to handle a person's mistakes - read_sums does that. - A folder --out cannot be looked into is refused with a sentence. - A run that fails removes the folders it made to hold --out, deepest first, stopping at the first one that is not empty. - Every new refusal says what to do next. - The junction helper in the guard wraps its error with %w and names both paths (the linter's errorlint, and the review). TestTheRendererLeavesNothingBehindWhenItFailsPartWay makes a refusal after new parent folders were made, a rename that fails after the working folder exists - a name too long for any file system this runs on - and a destination the account cannot list, asked of the system first. The refusal guard also hands the renderer a device as the checksum file. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Two warnings from the review summary of #143, which I read only after it was merged. Neither changes a rendered package - they change what the renderer says when its input is wrong.
What was wrong
--sumsnaming a file that is not there, cannot be read, or is not UTF-8 ended in a Python exception. The renderer's own contract is a refusal that names the input and says what to do.--outchecked by its spelling. The refusal for a destination inside the repository comparedabspathvalues, so a link or a junction leading into the tree was outside by name and inside in fact - and the packages would have been written there.What changes
v0.4.0), so anything near the limit is another file passed by mistake - an archive, for instance.ROOTand--outare compared as resolved paths (realpath).The review also suggested bounding the read against a huge checksum file exhausting memory. The file is one the maintainer chooses, so the size limit above answers the realistic case - a wrong file - rather than streaming.
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