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#+date: <2025-04-05 Saturday 23:04:54>
#+title: How I Streamlined Mirroring Repositories from GitHub to GitLab
#+description: Discover effective steps to synchronize and mirror your GitHub repositories to GitLab for seamless repository management and backup.
#+slug: git-mirror
#+filetags: :git:mirroring:automation:
This is a short post detailing how I maintained repositories on GitHub and
mirrors on GitLab - including both public and private repositories.
Since GitLab locks pull-only mirrors behing their Premium and Ultimate tiers, I
found a different solution.
* Creating Mirrors
I'll skip the setup and just hit the bullet points:
- I have a plethora of GitHub repositories.
- I used GitLab's mass-import functionality to do the initial import of my
repositories from GitHub.
- I made sure all of my GitHub repositories were cloned locally in my =~/git=
directory.
* Setting up Mirror Connections
To start, I navigated to the =~/git= directory, which holds all of the
repositories I have on GitHub and created a shell script.
#+begin_src shell
cd ~/git
nano setup_mirrors.sh
#+end_src
Within this shell script, I created a loop that will open each repository and
add both the GitHub and GitLab SSH-style clone URIs to the =origin= remote.
#+begin_src shell
for repo in */
do
cd $repo
git remote set-url origin --push --add git@github.com:ccleberg/${repo%*/}.git
git remote set-url origin --push --add git@gitlab.com:ccleberg/${repo%*/}.git
git remote -v
cd ..
done
#+end_src
Once complete, I created another shell script to open each repository, pull any
remote commits, and push local commits to both remotes.
#+begin_src shell
nano mirror.sh
#+end_src
#+begin_src shell
for repo in */;
do
cd $repo
git pull --rebase origin HEAD
git push
cd ..
done
#+end_src
Finally, enable execution of both scripts before moving on.
#+begin_src shell
chmod +x setup_mirrors.sh
chmod +x mirror.sh
#+end_src
* Initialize Mirrors
To use the =setup_mirrors.sh= script above, simply execute it from a terminal.
#+begin_src shell
./setup_mirrors.sh
#+end_src
Once complete, each repository /should/ have one fetch URI (GitHub) and two push
URIs (GitHub & GitLab). At this point, any =git pull= or =git fetch= commands
will pull from GitHub and any =git push= commands will send updates to both
GitHub and GitLab.
* Schedule Periodic Checks
To utilize the =mirror.sh= script from the previous step, let's use crontab.
#+begin_src shell
crontab -e
#+end_src
Within crontab, I used the schedule below to ensure the script is executed
daily.
#+begin_src text
0 0 * * * /Users/cmc/git/mirror.sh
#+end_src
This ensures that the =mirror.sh= file is executed daily and will push any local
or GitHub commits to GitLab.
I have tested this by manually running =mirror.sh= and watching the results.
There are edge cases where I will need to intervene and manually resolve merge
conflicts, but it's largely autonomous, so I'm happy with the results.
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