Dockerfile for cloning private git repo

Question

I'm trying to clone private git repository from github. I did a Dockerfile like this:

FROM ubuntu:12.04

RUN apt-get update
RUN apt-get install -y git
RUN mkdir -p /root/.ssh/
ADD ./id_rsa /root/.ssh/id_rsa
RUN git clone [email protected]:usr/repo.git

I use this repo with this key just fine locally, so it seems I'm missing something inside docker.

One more thing I may be missing is that both ~ and $HOME inside docker point to / instead of /root, but I'm not sure if that can be related.

Answer 1

What's the output of the build process?

Random guess: try to chmod 600 the private key.

If it still doesn't work, try to RUN ssh -v [email protected] (after adding the key); the output should explain what's happening.

Answer 2

RUN ssh-keyscan github.com >> ~/.ssh/known_hosts

The keyscan works great since it accepts the host. The following complete answer worked:

RUN mkdir -p /root/.ssh
RUN cp /var/my-app/id_rsa /root/.ssh/id_rsa
RUN chmod 600 /root/.ssh/id_rsa
RUN ssh-keyscan github.com >> /root/.ssh/known_hosts

Also as mentioned:

RUN ssh -v [email protected]

^ Great way to debug the flow. That's how I realized I needed the keyscan >> known_hosts