Debug image signing workflow failure#51
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JoshuaAFerguson merged 2 commits intoNov 16, 2025
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Resolves timing issues when signing images in consolidated workflow. The registry needs time to propagate multi-platform manifests after push. Changes: - Add retry logic (5 attempts with exponential backoff) to all signing steps - Add retry logic to all SBOM attestation steps - Improved error handling and debugging output - Initial delay: 2s, doubles each retry (2s, 4s, 8s, 16s, 32s) Root cause: When build/sign run in same workflow without delays, the manifest may not be immediately available for inspection via imagetools. Separate workflows had natural timing gaps that allowed propagation. This fix addresses failures like: - 'docker buildx imagetools inspect' returning incomplete/truncated digests - Cosign unable to reference images with malformed digest strings
Use docker manifest inspect with jq as primary method, fallback to
grep-based extraction from imagetools output. This resolves the issue
where --format template returned the full manifest instead of digest.
Changes:
- Use 'docker manifest inspect | jq .digest' for reliable extraction
- Fallback to grep pattern matching on imagetools output
- Keep retry logic with exponential backoff for manifest propagation
- Applied to all 6 digest extraction points (3 sign + 3 attest steps)
Fixes error: 'ERROR: unexpected digest format: Name: ghcr.io/...'
Root cause: The --format '{{.Manifest.Digest}}' template doesn't work
reliably with docker buildx imagetools for multi-platform manifests.
Using manifest inspect with JSON parsing is more reliable.
JoshuaAFerguson
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