100 lines
2.2 KiB
Markdown
100 lines
2.2 KiB
Markdown
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```txt
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/nix / /persist
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+------------------------+
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/store/x -|-> /var/x |
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| /var/lib/bluetooth <-|- /var/lib/bluetooth
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/store/y -|-> /bin/y |
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| /home/admin/.local <-|- /home/admin/.local
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/store/z -|-> /etc/z |
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+------------------------+
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```
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```nix
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{...}: {
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boot.initrd.postDeviceCommands = lib.mkAfter ''
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mkdir /btrfs_tmp
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mount /dev/mapper/crypted /btrfs_tmp
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if [[ -e /btrfs_tmp/root ]]; then
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mkdir -p /btrfs_tmp/old_roots
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timestamp=$(date --date="@$(stat -c %Y /btrfs_tmp/root)" "+%Y-%m-%-d_%H:%M:%S")
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mv /btrfs_tmp/root "/btrfs_tmp/old_roots/$timestamp"
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fi
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delete_subvolume_recursively() {
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IFS=$'\n'
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for i in $(btrfs subvolume list -o "$1" | cut -f 9- -d ' '); do
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delete_subvolume_recursively "/btrfs_tmp/$i"
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done
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btrfs subvolume delete "$1"
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}
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for i in $(find /btrfs_tmp/old_roots/ -maxdepth 1 -mtime +30); do
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delete_subvolume_recursively "$i"
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done
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btrfs subvolume create /btrfs_tmp/root
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umount /btrfs_tmp
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'';
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}
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```
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```nix
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{
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inputs = {
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impermanence = {
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url = "github:nix-community/impermanence";
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};
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};
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outputs = {self, ...} @ inputs: let
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system = "x86_64-linux";
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pkgs = inputs.nixpkgs.legacyPackages.${system};
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in {
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nixosConfigurations = {
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default = inputs.nixpkgs.lib.nixosSystem {
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inherit system;
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modules = [
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inputs.impermanence.nixosModules.impermanence
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...
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];
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};
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};
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}
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}
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```
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```nix
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{...}: {
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fileSystems."/persist".neededForBoot = true;
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environment.persistence."/persist" = {
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hideMounts = true;
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directories = [
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{
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directory = "/etc/nixos";
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user = "demo";
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mode = "u=rwx,g=rx,o=rx";
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}
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"/var/log"
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"/var/lib/bluetooth"
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"/var/lib/nixos"
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"/var/lib/systemd/coredump"
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"/etc/NetworkManager/system-connections"
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];
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files = [
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"/etc/machine-id"
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{
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file = "/var/keys/secret_file";
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parentDirectory = {mode = "u=rwx,g=,o=";};
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}
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];
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users."demo" = {
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directories = [
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"this-will-persist"
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];
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};
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};
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}
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```
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