RUN npm command inside if statements within dockerfile

Question

i have a dockerfile which is built with an ARG (name of the git branch). I want to run 2 if statements which test the name of the git branch: So if it is the test branch then it will run "npm run test", if it is master branch then "npm run build". I've tried this but it does not work :

RUN if [ "$GIT_BRANCH" = "test" ] ; then CMD npm test ; fi

RUN if [ "$GIT_BRANCH" = "master" ] ; then CMD npm build ; fi

It works with echo but not with npm commands. why ?

thank you

Possible duplicate of [RUN inside a conditional statement in Dockerfile](https://stackoverflow.com/questions/51518087/run-inside-a-conditional-statement-in-dockerfile) — Matias Fuentes, Apr 07 '19 at 21:04
@larsks it says /bin/sh: 1: CMD: not found The command '/bin/sh -c if [ "$GIT_BRANCH" = test" ] ; then CMD npm test ; fi' returned a non-zero code: 127 — YoussHark, Apr 07 '19 at 21:56

score 1 · Accepted Answer · answered Apr 08 '19 at 00:59

in case someone has the same problem one day : if you want to run an npm command inside if statements within a dockerfile, the key is to write:

RUN if [ "$GIT_BRANCH" = "test" ] ; then  /usr/bin/npm test --force ; fi

RUN if [ "$GIT_BRANCH" = "master" ] ; then /usr/bin/npm build --force ; fi

And it will work. The --force is essential otherwise it will launch a git error.

RUN npm command inside if statements within dockerfile

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