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Take a (trivial) Dockerfile:

FROM scratch
COPY *.xyz .

I would expect this to include any xyz files if present.

So testing with no xyz files - it builds fine locally:

% docker build .
{...}
[+] Building 0.0s (5/5) FINISHED

But if I submit the same Dockerfile via the API:

% tar -cf - Dockerfile | \
curl --unix-socket /var/run/docker.sock -H "Content-Type: application/x-tar" --data-binary @- "http://localhost:1/build"
{...}
{"errorDetail":{"message":"COPY failed: no source files were specified"},"error":"COPY failed: no source files were specified"}
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