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Git: is there a way to auto push a subtree?

I have a big private repository which is maintained on a local network. I'd like to automatically push a subtree of that repository outside of that network. I need it to be simple:

*Task* someone pushes to local remote repository --> a subtree is automatically pushed to some other repository

I am not sure if this could be achieved with a server side hook because AFAIK there is no such thing as pushing subtrees from bare remotes. I came up with two ideas:

  • I could clone the remote on the server and automatically split the subtree in the cloned remote. This doesn't really help because I don't know how to auto-pull the subtree (others also have this problem).
  • Another idea is to write a custom client-side post-commit-hook and make every user install it, but this is terrible, isn't it? Git book specifically states that policies should be enforced on server side.

Is there a simple way of achieving something like this? Or is this impossible and it's just git abuse?

like image 468
jjj Avatar asked Oct 17 '22 04:10

jjj


1 Answers

Umm, I'm a bit embarrassed. Apparently this was much easier than I thought. Here is a hasty solution which builds on @wrzasa suggestion:

  1. Clone your repository on the server to which you are pushing, like this (dir.git is a bare repo):

    .
    |- dir.git
    |- dir
    
  2. In dir do: git remote add <remote-name> <remote-address>

  3. In dir.git/hooks/post-receive put:

    #! /bin/bash
    unset GIT_DIR
    cd ../dir
    git pull ../dir.git
    git subtree split --prefix=<subdir-in-dir> --branch=<branch-name>
    git push <remote-name> <branch-name>
    

    Remember to make post-receive executable. See this answer if you wanna know why unset GIT_DIR is needed.

That's pretty much it. Now whenever someone pushes to dir remote (i.e. dir.git) subtree under <subdir-in-dir> will be pushed to <remote-name>.

like image 182
jjj Avatar answered Oct 21 '22 07:10

jjj