pig-monkey.com

Automated Repository Tracking

I have confidence in my backup strategies for my own data, but until recently I had not considered backing up other people’s data.

Recently, the author of a repository that I tracked on GitHub deleted his account and disappeared from the information super highway. I had a local copy of the repository, but I had not pulled it for a month. A number of recent changes were lost to me. This inspired me to setup the system I now use to automatically update local copies of any code repositories that are useful or interesting to me.

I clone the repositories into ~/library/src and use myrepos to interact with them. I use myrepos for work and personal repositories as well, so to keep this stuff segregated I setup a separate config file and a shell alias to refer to it.

alias lmr='mr --config $HOME/library/src/myrepos.conf --directory=$HOME/library/src'

Now when I want to add a new repository, I clone it normally and register it with myrepos.

$ cd ~/library/src
$ git clone https://github.com/warner/magic-wormhole
$ cd magic-wormhole && lmr register

The ~/library/src/myrepos.conf file has a default section which states that no repository should be updated more than once every 24 hours.

[DEFAULT]
skip = [ "$1" = update ] && ! hours_since "$1" 24

Now I can ask myrepos to update all of my tracked repositories. If it sees that it has already updated a repository within 24 hours, myrepos will skip the repository.

$ lmr update

To automate this I create a systemd service.

[Unit]
Description=Update library repositories

[Service]
Type=oneshot
ExecStart=/usr/bin/mr --config %h/library/src/myrepos.conf -j5 update

[Install]
WantedBy=multi-user.target

And a systemd timer to run the service every hour.

[Unit]
Description=Update library repositories timer

[Timer]
Unit=library-repos.service
OnCalendar=hourly
Persistent=True

[Install]
WantedBy=timers.target

I don’t enable this timer directly, but instead add it to my trusted_units file so that nmtrust will enable it only when I am on a trusted network.

$ echo "library-repos.timer,user:pigmonkey" >> /usr/local/etc/trusted_units

If I’m curious to see what has been recently active, I can ls -ltr ~/library/src. I find this more useful than GitHub stars or similar bookmarking.

I currently track 120 repositories. This is only 3.3 GB, which means I can incorporate it into my normal backup strategies without being concerned about the extra space.

The internet can be fickle, but it will be difficult for me to loose a repository again.

This post was published on . It was tagged with linux, backups.