Mirroring git repositories (to GitLab)

There are several open source git repos that I mirror in order to provide local speedy access to. Pushing those to a local GitLab server also means people can easily fork them and carry on.

On the GitLab server I have a local posix mrmirror user who also owns a group called mirror in GitLab (this user is cannot be called “mirror” as the user and group would conflict in GitLab).

In mrmirror’s home directory there’s a ~/git/mirror directory which stores all the repos that I want to mirror. The mrmirror user also has a cronjob that runs every few hours to pull down any updates and push them to the appropriate project in the GitLab mirror group.

So for example, to mirror Linux, I first create a new project in the GitLab mirror group called linux (this would be accessed at something like https://gitlab/mirror/linux.git).

Then as the mrmirror user on GitLab I run a mirror clone:
[mrmirror@gitlab ~]$ cd ~/git/mirror
[mrmirror@gitlab mirror]$ git clone --mirror git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git

Then the script takes care of future updates and pushes them directly to GitLab via localhost:
#!/bin/bash
 
# Setup proxy for any https remotes
export http_proxy=http://proxy:3128
export https_proxy=http://proxy:3128
 
cd ~/git/mirror
 
for x in $(ls -d *.git) ; do
    pushd ${x}
    git remote prune origin
    git remote update -p
    git push --mirror git@localhost:mirror/${x}"
    popd
done
 
echo $(date) > /tmp/git_mirror_update.timestamp

That’s managed by a simple cronjob that the mrmirror user has on the GitLab server:
[mrmirror@gitlab mirror]$ crontab -l
0 */4 * * * /usr/local/bin/git_mirror_update.sh

And that seems to be working really well.

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