ci: pin Iris-Codec AVIF to brew libavif to dodge gitiles 503 flake#19
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The IFE conformance gate installs Iris-Codec from source (its pyproject hardcodes IRIS_BUILD_DEPENDENCIES=ON). Its AVIF dependency ExternalProject- clones libavif and FetchContent-pulls libaom from aomedia.googlesource.com, whose gitiles "+archive" tarball endpoint intermittently returns HTTP 503 under load, reddening the whole macOS job before the validator runs (hit on two consecutive main runs). cmake/avif.cmake only triggers that ExternalProject when AVIF_LIBRARY or AVIF_INCLUDE is unset. Point both at the brew libavif already installed by the cgo-deps step so the clone/fetch is skipped; all other Iris-Codec deps still build vendored. Verified locally that the override suppresses the gitiles libaom fetch (build proceeds past AVIF with no aomedia/libavif.git network access). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Summary
pyprojecthardcodesIRIS_BUILD_DEPENDENCIES=ON). Its AVIF dep ExternalProject-clones libavif and FetchContent-pulls libaom fromaomedia.googlesource.com, whose gitiles+archivetarball endpoint intermittently returns HTTP 503, reddening the whole macOS job before the validator runs (hit on two consecutivemainruns).cmake/avif.cmakeonly triggers that ExternalProject whenAVIF_LIBRARYorAVIF_INCLUDEis unset. This points both at the brewlibavifalready installed by the cgo-deps step, so the clone/fetch is skipped. All other Iris-Codec deps still build vendored.Test Plan
aomedia.googlesource.comfetch.aomedia/libavif.gitnetwork access).🤖 Generated with Claude Code