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resolver: acquire registry capacity before opening writers - #7145
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tonistiigi merged 1 commit intoSep 24, 2026
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Acquire the shared registry semaphore before opening the destination writer so cache uploads cannot start a PUT while waiting for transfer capacity. Reuse the handler wrapper for pushes and fetches, retaining the existing nested-acquisition behavior. Signed-off-by: CrazyMax <1951866+crazy-max@users.noreply.github.com>
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fixes docker/buildx#4057
Cache exports currently open upload writers before acquiring the shared registry semaphore. This can leave
PUTrequests idle while other transfers occupy the available slots, allowing registry proxies to time out those requests and fail the build. Acquire capacity before opening the writer and hold it until the handler finishes.