nixos/snapper: improve config example #109607
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In the default configuration we have timers for creating and deleting snapper snapshots, and it looks like if we just create configs with correct mountpoints we will get automatic snapshots (which either used to be true, or seems to be only true on Archlinux according to their wiki). In default snapper configuration TIMELINE_CREATE and TIMELINE_CLEANUP are set to "no", so just providing configs won't be enough for having automatic backups, which are the main usecase for snapper. In other linux distributions you would use `snapper create-config` to generate configs for partitions and you'd have a chance to notice that TIMELINE_CREATE is set to no. Also, my guess is that it might be set to no by default for safety reasons in regular distros, so that the config won't be actioned upon until the user finishes customizing it.
ofborg
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6.topic: nixos
markuskowa
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Jan 17, 2021
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Motivation for this change
In the default snapper module configuration we have timers for creating and deleting snapper snapshots, and it looks like if we just create configs with correct mountpoints we will get automatic snapshots. This either used to be true, or seems to be only true on Archlinux according to their wiki: https://wiki.archlinux.org/index.php/Snapper#Enable/disable , "If you have a cron daemon, this feature should start automatically. To disable it, edit the configuration file corresponding with the subvolume you do not want to have this feature and set TIMELINE_CREATE=no"). It is not true on current NixOS.
Options TIMELINE_CREATE and TIMELINE_CLEANUP are set to "no" by default (according to snapper-configs(5)), so just providing configs won't be enough for having automatic backups, which are the main use case for snapper. It is especially important to have it in our docs, as on other linux distributions you would use
snapper create-configto generate configs for partitions, and you'd see that TIMELINE_CREATE and TIMELINE_CLEANUP are set to no. Also, my guess is that it might be set to no by default purely for safety reasons in regular distros, so that the config won't be actioned upon until the user finishes customizing it.Things done
Added TIMELINE_CREATE=yes and TIMELINE_CLEANUP=yes into snapper service config example.
sandboxinnix.confon non-NixOS linux)nix-shell -p nixpkgs-review --run "nixpkgs-review wip"./result/bin/)nix path-info -Sbefore and after)