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Introduction

Our HA platform design relies on Atomic OS, which only contains bare minimum elements to run containers.

So how can we use git on this system, to push/pull the changes we make to config files? With a container, of course!

git-docker

I made a simple container which just basically executes git in the CWD:

To use it transparently, add an alias for the "git" command, or just download it with the rest of the handy aliases:

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alias git='docker run -v $PWD:/var/data -v \
/var/data/git-docker/data/.ssh:/root/.ssh funkypenguin/git-docker git'

Setup SSH key

If you plan to actually push using git, you'll need to setup an SSH keypair. You could copy across whatever keypair you currently use, but it's probably more appropriate to generate a specific keypair for this purpose.

Generate your new SSH keypair by running:

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mkdir -p /var/data/git-docker/data/.ssh
chmod 600 /var/data/git-docker/data/.ssh
docker run -v /var/data/git-docker/data/.ssh:/root/.ssh funkypenguin/git-docker ssh-keygen -t ed25519 -f /root/.ssh/id_ed25519

The output will look something like this:

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Generating public/private ed25519 key pair.
Enter passphrase (empty for no passphrase): Enter same passphrase again: Created directory '/root/.ssh'.
Your identification has been saved in /root/.ssh/id_ed25519.
Your public key has been saved in /root/.ssh/id_ed25519.pub.
The key fingerprint is:
SHA256:uZtriS7ypx7Q4kr+w++nHhHpcRfpf5MhxP3Wpx3H3hk root@a230749d8d8a
The key's randomart image is:
+--[ED25519 256]--+
|         .o .    |
|      .  ..o .   |
|     + ....   ...|
|   .. + .o . . E=|
|  o .o  S . . ++B|
| . o  .  . . +..+|
| .o .. ...  . .  |
|o..o..+.oo       |
|...=OX+.+.       |
+----[SHA256]-----+

Now add the contents of /var/data/git-docker/data/.ssh/id_ed25519.pub to your git account, and off you go - just run "git" from your Atomic host as usual, and pretend that you have the client installed!

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