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Add some information about the docker build return code
Signed-off-by: Sven Dowideit <SvenDowideit@home.org.au>
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@ -525,6 +525,29 @@ on your local host, and then this is sent to the Docker daemon as the
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context. This way, your local user credentials and VPN's etc can be
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used to access private repositories.
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### Return code
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On a successful build, a return code of success `0` will be returned.
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When the build fails, a non-zero failure code will be returned.
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There should be informational output of the reason for failure output
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to `STDERR`:
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```
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$ docker build -t fail .
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Sending build context to Docker daemon 2.048 kB
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Sending build context to Docker daemon
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Step 0 : FROM busybox
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---> 4986bf8c1536
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Step 1 : RUN exit 13
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---> Running in e26670ec7a0a
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INFO[0000] The command [/bin/sh -c exit 13] returned a non-zero code: 13
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$ echo $?
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1
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```
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### .dockerignore file
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If a file named `.dockerignore` exists in the root of `PATH` then it
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is interpreted as a newline-separated list of exclusion patterns.
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Exclusion patterns match files or directories relative to `PATH` that
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