Docker Copy and change owner
A --chown
flag has finally been added to COPY
:
COPY --chown=patrick hostPath containerPath
This new syntax seems to work on Docker 17.09.
See the PR for more information.
I think I found a solution, which works. Using a data volume container will do the trick. First I create the Data Volume Container, which contains the copy of my external directory:
FROM busybox
RUN mkdir /data
VOLUME /data
COPY /test /data/test
CMD /bin/sh
In my application container, where I have my users, which could look something like this
FROM ubuntu
RUN groupadd mygroup
RUN useradd -ms /bin/bash -G mygroup john
COPY setpermissions.sh /root/setpermissions.sh
CMD /root/setpermissions.sh && /bin/bash
The setpermissions script does the job of setting the user permissions:
#!/bin/bash
if [ ! -e /data/.bootstrapped ] ; then
chown -R john:mygroup /data
touch /data/.bootstrapped
fi
Now I just have to use the --volumes-from <myDataContainerId>
when running the application container.