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failed to compute cache key: failed to calculate checksum of ref <ref>: "/<file>": not found

Not confirmed yet · posted

Cause

a COPY or ADD source is not in the build context: it lies outside the context directory, a .dockerignore rule excludes it, or the build ran from the wrong directory.

Fix

risk: low

# run from the directory that holds the COPY sources; point -f at the Dockerfiledocker build -f <dir>/Dockerfile -t <image> .grep -n '<file>' .dockerignore     # a matching rule drops it from the context# files outside the context: docker buildx build --build-context <name>=<dir> + COPY --from=<name>

Don’t try

COPY ../<file> . — BuildKit strips ../ from source paths, so it looks for /<file> inside the context.

docker build --no-cache — the file is still absent from the context; the cache is not the problem.

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