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githubdockerverification

docker git and pull setup

I have a repo set up in github to pull into a docker build. I want to add my keys so I can connect to git but I'm unsuccessfully adding the key file. The error:

id_rsa: no such file or directory

The file exists in the dir specified in the Dockerfile. I tried linking my local file to the docker enviroment with ln command but I get the same error. Here's the docker statements:

 RUN mkdir /root/.ssh && ln -s /Users/e002678/.ssh /root/.ssh
 RUN touch /root/.ssh/known_hosts
 ADD id_rsa /root/.ssh/id_rsa
 RUN adduser git
 RUN ssh-keyscan github.com >> /root/.ssh/known_hosts

In a variant attempt I tried adding a shared volume with the same results:

 VOLUME ["/Users/e002678/.ssh"]
 ADD /Users/e002678/.ssh/id_rsa /root/.ssh/id_rsa

Thanks!

Solution

  • Docker ADD only works relative to the Dockerfile directory.

    For ADD /Users/e002678/.ssh/id_rsa /root/.ssh/id_rsa to work, you need a source directory like:

    $ ls
./Dockerfile
./Users/e002678/.ssh/id_rsa

    Tip ADD copies files "with metadata," i.e. files are copied with the exact same user id, same group id, and same permissions. So explicitly chown/chmod keys after adding them: 

    ADD ./Users/e002678/.ssh/id_rsa /root/.ssh/id_rsa
RUN chown root: /root/.ssh/id_rsa && chmod 600 /root/.ssh/id_rsa

    Pro Tip Docker ADD creates any needed directories in a path, so RUN mkdir instructions are unnecessary.