The "Build pinned Linux Embedded MPV runtime" job failed twice on 2026-08-11
because www.freedesktop.org answered GitHub runners with HTTP 418 for the
fontconfig tarball. The Linux builder curled a single pinned URL with no
fallback, so upstream rate-limiting reddened the build.
Route downloadArchive() through the shared downloadPinnedSource() helper the
macOS builder already uses, and pin a mirror for each single-host source:
fontconfig and libdisplay-info (freedesktop-hosted) plus freetype, which the
macOS builder already mirrors. Each mirror was downloaded and verified to hash
to the existing pin. The curl hardening flags and assertArchiveMatchesPin are
unchanged, and the helper verifies every candidate against the same SHA-256,
so a mirror serving different bytes is rejected rather than used.
Unlike macOS, the Linux manifest keeps sourceUrl at the canonical pinned value
even when a mirror served the bytes: notice generation and the Snap publication
boundary compare that field against the immutable pin. A used mirror is logged
instead.
build-linux-runtime.mjs now imports the downloader, so download-pinned-source.mjs
joins the released source-archive tooling set (otherwise the archive would ship
a build script it cannot run) and the Linux runtime cache key.
Co-authored-by: Claude Opus 5 <noreply@anthropic.com>
Supersedes #1249, #1245 and #1247, which each rewrote the full-commit pins in
publish-snap.yaml while the same SHAs are asserted in three packaging test
files — merged separately, every one of them left those tests red.
actions/checkout v4 -> v7 (docker.yml from v6), actions/upload-artifact
v4 -> v7, actions/download-artifact v4 -> v8. New pins verified against the
upstream tag refs: checkout 3d3c42e5 = v7.0.1, upload-artifact 043fb46d =
v7.0.1, download-artifact 3e5f45b2 = v8.0.1.
download-artifact v8 changes two things on the Snap publish path, both in our
favour: a digest mismatch now fails the run instead of logging a warning, and
decompression is skipped for non-zip Content-Types (our artifact is a normal
upload-artifact zip, so unchanged). checkout v7's fork-PR block only applies to
pull_request_target/workflow_run, neither of which exists here.
