I’m converting an app to a new image, and the existing commands use substring expansion to set the artifact version like so: mvn clean versions:set -DnewVersion="0.1.$VCSINFO.I${INFO:0:6}.M$OTHER_INFO". I’m using a ubuntu image that defaults to /bin/sh, and I am unable to figure out how to either do something equivalent in bourne shell, or switch shells to run the command. I know bash is installed because I can see it in /etc/shells.
I tried using RUN ['/bin/bash', '-c', '...'] but I can see it is just running that command like so The command '/bin/sh -c ['/bin/bash', '-c',.... What is the best way to convert this functionality over to this new image?
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Answer
You can run a bash command in two ways, even from sh: Either by passing the string ‘/bin/bash path/to/your/cmd’ to the -c option of sh, or by setting the x-bit in cmd and having as the first line in cmd a #!/bin/bash.
Hence in your setting I would try either a RUN ['/bin/bash /path/to/your/cmd'] or just do a RUN ['/path/to/your/cmd'] and ensure that cmd has the #! line mentioned above, or complicated but fail safe – write a sh wrapper script, which then invokes the bash script in turn. Hence, if this wrappe script is called /path/to/your/cmdwrapper.sh, its content would be
: /bin/bash /path/to/your/cmd