COPY does not handle empty arguments well about imagebuilder HOT 3 CLOSED

This will create a file /tmpDockerfile. in / docker build ignores the empty string.

Just to add to this, imagebuilder puts anything in the source directory on the host into / (not limited to Dockerfile)
docker/podman build does something similar, but instead puts all the files into /tmp

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@joepvd which version of docker build are you testing with? When I run your reproducer with a file other than Dockerfile in the build context directory with 19.03.12 (say, by running touch NOT-THIS-FILE first), docker build copies it to the destination directory, too, as if the empty quoted value was being treated as * rather than being ignored.

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@derekhiggins Thanks for clearing things up!

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