Automatic Radicale backups with Git
Setting up Git
sudo apt-get install python-dulwich git
Once the required packages are installed, check which folder Radicale is using
to store data. This is set with the
filesystem_folder option and defaults to
$ grep filesystem_folder /etc/radicale/config filesystem_folder = /var/lib/radicale/collections
git init as the
radicale user to setup the git repository:
sudo -u radicale bash -c 'cd /var/lib/radicale/collections/ && git init'
Finally restart Radicale:
systemctl restart Radicale
All changes made to the files managed by Radicale should now be automatically
tracked with Git. It's worth noting that commits will be made using
Radicale <email@example.com> by default, however this can be configured in
[git] section of the config with the
Git hooks are programs or scripts run at certain points in git's execution. For this post we are going to create a very simple post-commit hook that will push any new commits made by Radicale to a remote server.
The first step is to setup SSH keys for the Radicale user:
sudo -u radicale ssh-keygen
Once SSH keys have been setup, copy them to the remote host. This can be done using ssh-copy-id:
sudo -u radicale ssh-copy-id user@backup-host
Assuming SSH authentication is now setup, create a bare repository on the remote server. This repo will be used to mirror the repo Radicale commits to:
sudo -u radicale ssh user@backup-host 'git init --bare ~/radicale-backup.git'
radicale user, add the new remote to the local Radicale repository:
sudo -u radicale bash -c 'cd /var/lib/radicale/collections/ && git remote add backup ssh://user@backup-host/home/user/radicale-backup.git'
Finally create a simple hook to push changes made to the backup repository:
cat > /var/lib/radicale/collections/.git/hooks/post-commit <<EOF #!/bin/sh cd /var/lib/radicale/collections/ git push backup --all EOF chown radicale: /var/lib/radicale/collections/.git/hooks/post-commit chmod 755 /var/lib/radicale/collections/.git/hooks/post-commit
Now every time changes are made, Radicale should commit the changes and replicate them to the remote repository.
Future versions of Radicale
Unfortunately Git support is being dropped in
Radicale 2.0. There is however a hook feature than
can be used to run arbitrary scripts. This should make it fairly simple to
replicate Git support by calling
git from a script.