CODEWITHSUNDEEP
dockerdockerfile
marinoszago
marinoszago

Reputation: 3

Docker ARG or ENV not working as expected in Dockerfile

I use Docker Toolbox for windows (for compatibility issues) and in the Dockerfile I specify an ARG so that I can use it when building the image with --build-arg command. Inside the dockerfile I also have some COPY commands and there I would like to use my variable but when I run docker build --build-arg VERSION_APP=something . it does not translate the variable . I have already used $VERSION_APP or ${VERSION_APP} or %VERSION_APP%.

FROM alpine
MAINTAINER Marinos

ARG VERSION_APP


RUN apk update && apk add dos2unix

COPY script.sh /home/script.sh
RUN chmod a+x /home/script.sh

RUN dos2unix /home/script.sh 

RUN sh /home/script.sh 

COPY installation.txt /home/Desktop/${VERSION_APP}

UPDATE

It seems that you should pass the whole path to the variable you use that is how I got it working.

Upvotes: 0

Views: 6463

Answers (1)

Mostafa Hussein
Mostafa Hussein

Reputation: 11950

If you actually use the command below then it is expected not to work because the argument called VERSION_APP

docker build --build-arg myVar=something

So the command should be

docker build --build-arg VERSION_APP=something

And in Dockerfile it should be %VERSION_APP% also you may need to use ENV like below:

ARG VERSION_APP
ENV VERSION_APP ${VERSION_APP}

Upvotes: 4

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