fix(pixlet): resolve the release tag correctly when downloading - #461
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Starlark apps render through the pixlet binary, and the installer that fetches it silently produced nothing, so every app failed with "Pixlet not available - Starlark apps will not work". Two compounding defects: The version lookup parsed the wrong token. GitHub returns the release JSON on a single line, so `grep '"tag_name"'` matches the whole document and the greedy `sed 's/.*"([^"]+)".*/\1/'` captures the LAST quoted string in it. That resolved to "mentions_count", giving a download URL for a release that does not exist. The `[ -z "$PIXLET_VERSION" ]` fallback never fired, because the value was not empty -- just wrong. And `curl -L -o` without `-f` writes a 404 body to the file and exits 0, so the download was reported as successful and the first sign of trouble was tar complaining "not in gzip format" about a page of HTML: → Downloading linux-arm64... Extracting... gzip: stdin: not in gzip format ✗ Failed to extract archive: .../pixlet_mentions_count_linux-arm64.tar.gz Download complete: 0/1 succeeded Now the tag field is matched directly and the value taken from it, and the result is checked for a version shape rather than merely being non-empty -- a wrong-but-non-empty value is exactly what made this silent. curl gets -f so an HTTP error is a failure, and the archive is gzip-tested before extraction, since a proxy can return 200 with an error page. Verified on an arm64 rig: v0.53.1 resolved, 1/1 downloaded, the binary runs, and the plugin's own detection finds it at bin/pixlet/pixlet-linux-arm64. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Udr6MfaFLUPhX5Fgo67Jf5
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📝 WalkthroughWalkthroughThe Pixlet download script now validates the detected release version, fails on HTTP download errors, and checks downloaded files as gzip archives. Invalid downloads produce diagnostics, are removed, and cause the script to fail. ChangesPixlet download validation
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk:🔵 Low · up to The downloader now resolves releases and rejects invalid archives more reliably. Two bounded follow-ups remain: malformed release tags could still produce an invalid download URL, and error diagnostics could affect terminal or CI output; the PR is mergeable with explicit owner awareness. Possibly related PRs
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches📝 Generate docstrings
🧪 Generate unit tests (beta)
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Actionable comments posted: 2
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Inline comments:
In `@scripts/download_pixlet.sh`:
- Line 93: Update the invalid-response diagnostic in the download script around
the temp_file preview so external bytes are encoded as hex or escaped
non-printable data before output. Replace the echo-based rendering with printf
while preserving the existing 60-byte preview limit and diagnostic context.
- Around line 39-40: Update the PIXLET_VERSION validation in the download script
to require a complete documented vX.Y.Z release tag, allowing only explicitly
supported prerelease or build suffixes, with anchors at both the beginning and
end; reject partial versions and trailing garbage before constructing the
release URL.
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Both CodeRabbit findings were valid. The shape check accepted partial matches, so "v0.53garbage", "0.53" and "v0.5" passed it and built a download URL for a release that cannot exist -- the failure the check was added to stop, just one step later. Anchored at both ends now. Every tronbyt/pixlet release to date is vX.Y.Z (all 38 verified against the API), with an optional suffix left for a future -rc.1 or +build tag. The invalid-response diagnostic printed bytes straight from whatever answered the request. NUL and newline were filtered but escape, carriage return and backspace were not, so an error page could rewrite the output or bury it in a CI log. Non-printable bytes are stripped and it goes through printf. CodeRabbit suggested hex-encoding the lot; printable characters are kept instead, because "<!DOCTYPE html>" is the diagnostic -- hex would make the line safe and useless. Also corrected the comment above the parse. It asserted GitHub returns this JSON on a single line; the API is pretty-printed by default, and I could not get a single-line response from two machines across five header variants. The single-line case is real (it is what produces "mentions_count", and the failing device's error named pixlet_mentions_count_linux-arm64.tar.gz), but it is a shape to be robust against, not a constant. As written the comment invites the next reader to check by hand, see pretty JSON, and conclude the fix was unnecessary. Tests drive the real script with a stubbed curl: the tag resolves from both response shapes, non-release values fall back, an HTTP error is reported as a download failure rather than surfacing later as a tar error, a non-archive body is rejected before extraction, and the diagnostic cannot carry control bytes. The stub honours -f the way real curl does -- without that, the HTTP-error test passed against the old script too, since both end at 0/1 and only the reporting layer differs. Mutation-checked: 10 of the 16 fail against the pre-fix script, and the 5 covering these two findings fail against this branch's previous state. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01STMbQE4YctTacQXfbYqKuW
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Why Starlark apps weren't loading
They render through the
pixletbinary. It wasn't installed on any device I checked, and the installer that's supposed to fetch it silently produced nothing:So the plugin loaded but every render failed with "Pixlet not available - Starlark apps will not work".
Two compounding defects
The version lookup captured the wrong token. GitHub returns the release JSON on a single line, so
grep '"tag_name"'matches the whole document and the greedysed -E 's/.*"([^"]+)".*/\1/'takes the last quoted string in it. That resolved tomentions_count:The
[ -z "$PIXLET_VERSION" ]fallback never fired, because the value wasn't empty — just wrong. That's what made it silent.curl -L -owithout-fwrites the 404 body to the file and exits 0, so the download reported success and the failure only surfaced as a confusing gzip error about what was actually a page of HTML.The fix
tag_namefield itself and take the value after it.curl -fso an HTTP error is a failure.gzip -tbefore extracting, since a proxy can return 200 with an error page, and report the first bytes when it isn't an archive.Verified
On an arm64 Pi:
And the plugin's own detection now finds it:
Note for users
Installing pixlet is necessary but not sufficient —
starlark-appsalso ships"enabled": false, so it needs enabling in config or via the Plugin Manager. On both devices I checked, both were true: no binary and disabled.Summary by CodeRabbit