configurable bind mount, for docker-compose support

[aripringle]

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[hecbuma]

@aripringle I'm trying your solution but I keep getting an error when I try to run my container with docker-compose.

Cannot create container for service web: invalid mount config for type "bind": bind source path does not exist: /Users/myUser/.pinata-ssh-agent

my docker-compose.yml looks like this:

version: '3.3'

services:
 ...

  web:
    image: ecomm:latest
    command: bundle exec foreman start -f Procfile.development
    ports:
      - "5000:5000"
    links:
      - db
      - redis
    environment:
      - REDIS_URL=redis://cache
      - SSH_AUTH_SOCK=/ssh-agent/ssh-agent.sock
    volumes:
      - type: bind
        source: ${HOME}/.pinata-ssh-agent
        target: /ssh-agent
      - .:/myapp  

# Names our volume
volumes:
  my-db:

Can you give me a hand?

[aripringle]

@hecbuma Two things should need to happen here:

1. As mentioned in my README changes, .pinata-ssh.env file that declares VOLUME_TYPE=bind. Quick command for that should be:
   echo 'VOLUME_TYPE=bind' > ~/.pinata-ssh.env

2. As described in the original README, you'll need to run pinata-ssh-forward on every boot of your machine.

After doing these two steps (presuming you're using the changes from this PR), you should find a .pinata-ssh-agent directory created in your home dir, at which point your docker-compose config should work.

Hope that helps!

[hecbuma]

@aripringle ok I was in the wrong branch 🙃 now I switched to docker-compose-support and the folder is created correctly.

Now I'm trying to bring up my container with docker-compose and for a test, I'm trying to ssh into GitHub just to confirm the agent is being forwarded but I keep getting permission denied

Step 3/9 : RUN ssh -T git@github.com
 ---> Running in dcf1f92f0530
Warning: Permanently added the RSA host key for IP address '140.82.114.3' to the list of known hosts.
git@github.com: Permission denied (publickey).

Do you have another way to confirm is it working?

[hecbuma]

@aripringle ok nevermind I was doing it wrong trying to use the volume and the socket on the build. I remove that from my Dockerfile and let the container build, after that I tried to ssh to GitHub and worked.

Thanks!

$ docker-compose run web ssh -T git@github.com
Starting e-dd_db_1 ... done
Starting cache       ... done
Warning: Permanently added the RSA host key for IP address '192.30.253.113' to the list of known hosts.
Hi XXX! You've successfully authenticated, but GitHub does not provide shell access.