Docker modify PATH variable through bash command is not working

Question

I am trying to modify my PATH variable in my Dockerfile. I am running source /root/.bash_profile to change it. But PATH doesn't change. My Dockerfile:

FROM ubuntu:20.04
ENV DEBIAN_FRONTEND=nonintercative

RUN apt-get update && apt-get install -y \
    tar \
    wget \
 && rm -rf /var/lib/apt/lists/*

RUN wget -P /home "https://go.dev/dl/go1.20.src.tar.gz" && \
    rm -rf /usr/local/go && \
    tar -C /usr/local -xzf /home/"go1.20.src.tar.gz" && \
    rm /home/"go1.20.src.tar.gz"

RUN echo "export PATH=$PATH:/usr/local/go/bin:$HOME/go/bin" >> $HOME/.bash_profile 
#RUN /bin/bash -c 'source $HOME/.bash_profile'
RUN ["/bin/bash","-c","source $HOME/.bash_profile"]

When running the container I can see that the PATH hasn't been changed.

I've found that I can use the following command: ENV PATH="${PATH}:usr/local/go/bin:$HOME/go/bin"

I wonder why the first method does not work. Are the variables not saved between the different layers of the Docker image?

The settings are not saved in subsequent layers. Indeed, in this case, they are barely "saved" in the layer in which they are being executed. That RUN command invokes a shell which sources the .bash_profile and sets PATH in its environment, but that setting vanishes as soon as the shell that executed it exits. — William Pursell, Apr 30 '23 at 12:38
I was using version 1.19.1 there was no image. Now Indeed I can use an image — Drago_ir, Apr 30 '23 at 12:41

Docker modify PATH variable through bash command is not working

0 Answers0