impermanence-talk/slides/schema.md

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2024-04-09 11:27:55 +00:00
```txt
/nix / /persist
+------------------------+
/store/x -|-> /var/x |
| /var/lib/bluetooth <-|- /var/lib/bluetooth
/store/y -|-> /bin/y |
| /home/admin/.local <-|- /home/admin/.local
/store/z -|-> /etc/z |
+------------------------+
```
```nix
{...}: {
boot.initrd.postDeviceCommands = lib.mkAfter ''
mkdir /btrfs_tmp
mount /dev/mapper/crypted /btrfs_tmp
if [[ -e /btrfs_tmp/root ]]; then
mkdir -p /btrfs_tmp/old_roots
timestamp=$(date --date="@$(stat -c %Y /btrfs_tmp/root)" "+%Y-%m-%-d_%H:%M:%S")
mv /btrfs_tmp/root "/btrfs_tmp/old_roots/$timestamp"
fi
delete_subvolume_recursively() {
IFS=$'\n'
for i in $(btrfs subvolume list -o "$1" | cut -f 9- -d ' '); do
delete_subvolume_recursively "/btrfs_tmp/$i"
done
btrfs subvolume delete "$1"
}
for i in $(find /btrfs_tmp/old_roots/ -maxdepth 1 -mtime +30); do
delete_subvolume_recursively "$i"
done
btrfs subvolume create /btrfs_tmp/root
umount /btrfs_tmp
'';
}
```
```nix
{
inputs = {
impermanence = {
url = "github:nix-community/impermanence";
};
};
outputs = {self, ...} @ inputs: let
system = "x86_64-linux";
pkgs = inputs.nixpkgs.legacyPackages.${system};
in {
nixosConfigurations = {
default = inputs.nixpkgs.lib.nixosSystem {
inherit system;
modules = [
inputs.impermanence.nixosModules.impermanence
...
];
};
};
}
}
```
```txt
```