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Fix
crane append
for named pipes (#868)
* stream.Layer: Don't fail if Close is called twice Fixes #707 * crane.Append: Use stream.Layer for pipes It's annoying that `crane append` is hard to use with one-liners, which is the secret goal of most crane commands. We now stat the layer files and use a streaming layer for anything that's not a regular file, which includes named pipes, which fail if we try to open them multiple times. Now you can do this: $ crane append -f <(tar -c some-dir/ -f -) -t $IMAGE
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