Settings path in ENV in Dockerfile get overruled?-CodePudding

I do something like this:

FROM registry.access.redhat.com/ubi8/python-39:1-48
USER root

ENV APP_ROOT=/jup\
    PY_PKG_DIR=${APP_ROOT}/src/app-pkg\
    ...

I copy files to that path:

COPY start-singleuser.sh jupyter_notebook_config.py ${PY_PKG_DIR}

I want to set my entrypoint dynamically:

ENTRYPOINT ["/bin/bash", "$PY_PKG_DIR/start-singleuser.sh"]

This does not work (path is NOT /jup/src/app-pkg, since the files are in a different location. I found them here:

opt/app-root/src/app-pkg

How does this happen? Is it possible in the baseimage to overrule my APP_ROOT Variable?

CodePudding user response：

if you want to use set one env var from another you should separate declaration, because variables in ENV won't be set until the command has completed

ENV APP_ROOT=/jup
ENV PY_PKG_DIR=${APP_ROOT}/src/app-pkg \