fix(orchestrator): tolerate unsignable uploads on a layer cache hit - #3633
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A cache hit needs no upload URL, but InitLayerFileUpload minted one before checking Exists, so any provider that cannot sign an upload URL for an external client failed every COPY instruction — including the ones whose layer files were already cached. Azure is that provider: Put Blob requires the x-ms-blob-type request header, which a SAS cannot carry. Exists now runs first and a signing failure is fatal only on a miss, and only for the typed ErrSignedUploadURLUnsupported sentinel so a broken credential still surfaces. Cache misses on Azure keep failing until signed uploads land. GCS, S3 and the filesystem provider are unchanged: they still return the URL on a hit, which is what the SDK gates forceUpload re-uploads on. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
michalsuba-e2b
marked this pull request as ready for review
September 14, 2026 07:36
michalsuba-e2b
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ValentaTomas,
dobrac and
jakubno
as code owners
September 14, 2026 07:36
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