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GeezerVison is showing github.com — build/bake: support reproducible timestamps with source-date-epoch by crazy-max · Pull Request #338 · docker/github-builder

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@crazy-max

@crazy-max crazy-max commented Nov 5, 2026

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fixes #307

Add an optional source-date-epoch input to both workflows to align build output and generated metadata timestamps. It accepts a non-negative Unix timestamp, including zero, or commit to use the event commit's committer time without a checkout. Image exports enable timestamp rewriting for layer contents, while local exports use BuildKit's built-in timestamp handling. Leaving the input empty preserves existing behavior.

Provenance still contains execution-specific data, so final image index digests can differ even when image contents are reproducible.

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@crazy-max
crazy-max requested a review from tonistiigi November 5, 2026 13:51
@crazy-max
crazy-max requested a review from a team as a code owner November 5, 2026 13:51
@github-actions github-actions Bot assigned crazy-max Nov 5, 2026
@crazy-max
crazy-max force-pushed the source-date-epoch branch from 0febf87 to b71c540 Compare November 5, 2026 13:53
@crazy-max
build/bake: support reproducible timestamps with source-date-epoch
cf3e239 
Signed-off-by: CrazyMax <[email protected]>
@crazy-max
crazy-max force-pushed the source-date-epoch branch from b71c540 to cf3e239 Compare November 5, 2026 15:24

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@tonistiigi tonistiigi Awaiting requested review from tonistiigi

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Support reproducible builds with SOURCE_DATE_EPOCH

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@crazy-max
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