Say I have this:
ARG my_user="root" # my_user => default is "root"
USER $my_user
ENV USER=$my_user
All good so far, but now we get here:
ENV HOME="/root"
is there a way to do something like this:
ENV HOME $my_user === "root"? "/root" : "/home/$my_user"
Obviously, that's the wrong syntax.
The only solution I can think of is to just use two --build-args, something like this:
docker build -t zoom \
--build-arg my_user="foo" \
--build-arg my_home="/home/foo" \
.
Unfortunately you can't do this directly
https://forums.docker.com/t/how-do-i-send-runs-output-to-env-in-dockerfile/16106/3
So you have two alternatives
Use a shell script at start
You can use a shell script at the start
CMD /start.sh
And in your start.sh you can have that logic
if [ $X == "Y" ]; then
export X=Y
else
export X=Z
fi
Create a profile environment variable
FROM alpine
RUN echo "export NAME=TARUN" > /etc/profile.d/myenv.sh
SHELL ["/bin/sh", "-lc"]
CMD env
And then you when you run it
$ docker run test
HOSTNAME=d98d44fa1dc9
SHLVL=1
HOME=/root
PAGER=less
PS1=\h:\w\$
NAME=TARUN
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
PWD=/
CHARSET=UTF-8
Note: The
SHELL ["/bin/sh", "-lc"]is quite important here, else the profile will not be loadedNote2: Instead of
RUN echo "export NAME=TARUN" > /etc/profile.d/myenv.shyou can also do aCOPY myevn.sh /etc/profile.d/myenv.shand have the file be present in your build context
Collected from the Internet
Please contact [email protected] to delete if infringement.
Comments