131 lines
3.8 KiB
Nix
131 lines
3.8 KiB
Nix
{
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config,
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lib,
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pkgs,
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...
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}:
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let
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cfg = config.clan.borgbackup;
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in
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{
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options.clan.borgbackup.destinations = lib.mkOption {
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type = lib.types.attrsOf (
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lib.types.submodule (
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{ name, ... }:
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{
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options = {
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name = lib.mkOption {
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type = lib.types.strMatching "^[a-zA-Z0-9._-]+$";
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default = name;
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description = "the name of the backup job";
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};
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repo = lib.mkOption {
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type = lib.types.str;
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description = "the borgbackup repository to backup to";
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};
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rsh = lib.mkOption {
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type = lib.types.str;
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default = "ssh -i ${
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config.clanCore.secrets.borgbackup.secrets."borgbackup.ssh".path
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} -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null";
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description = "the rsh to use for the backup";
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};
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};
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}
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)
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);
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default = { };
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description = ''
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destinations where the machine should be backuped to
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'';
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};
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imports = [
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(lib.mkRemovedOptionModule [
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"clan"
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"borgbackup"
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"enable"
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] "Just define clan.borgbackup.destinations to enable it")
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];
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config = lib.mkIf (cfg.destinations != { }) {
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services.borgbackup.jobs = lib.mapAttrs (_: dest: {
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paths = lib.flatten (map (state: state.folders) (lib.attrValues config.clanCore.state));
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exclude = [ "*.pyc" ];
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repo = dest.repo;
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environment.BORG_RSH = dest.rsh;
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compression = "auto,zstd";
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startAt = "*-*-* 01:00:00";
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persistentTimer = true;
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preHook = ''
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set -x
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'';
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encryption = {
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mode = "repokey";
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passCommand = "cat ${config.clanCore.secrets.borgbackup.secrets."borgbackup.repokey".path}";
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};
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prune.keep = {
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within = "1d"; # Keep all archives from the last day
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daily = 7;
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weekly = 4;
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monthly = 0;
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};
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}) cfg.destinations;
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clanCore.secrets.borgbackup = {
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facts."borgbackup.ssh.pub" = { };
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secrets."borgbackup.ssh" = { };
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secrets."borgbackup.repokey" = { };
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generator.path = [
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pkgs.openssh
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pkgs.coreutils
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pkgs.xkcdpass
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];
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generator.script = ''
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ssh-keygen -t ed25519 -N "" -f "$secrets"/borgbackup.ssh
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mv "$secrets"/borgbackup.ssh.pub "$facts"/borgbackup.ssh.pub
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xkcdpass -n 4 -d - > "$secrets"/borgbackup.repokey
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'';
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};
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environment.systemPackages = [
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(pkgs.writeShellScriptBin "borgbackup-create" ''
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set -efu -o pipefail
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${lib.concatMapStringsSep "\n" (dest: ''
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systemctl start borgbackup-job-${dest.name}
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'') (lib.attrValues cfg.destinations)}
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'')
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(pkgs.writeShellScriptBin "borgbackup-list" ''
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set -efu
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(${
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lib.concatMapStringsSep "\n" (
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dest:
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# we need yes here to skip the changed url verification
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''yes y | borg-job-${dest.name} list --json | jq '[.archives[] | {"name": ("${dest.name}::${dest.repo}::" + .name)}]' ''
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) (lib.attrValues cfg.destinations)
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}) | ${pkgs.jq}/bin/jq -s 'add'
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'')
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(pkgs.writeShellScriptBin "borgbackup-restore" ''
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set -efux
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cd /
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IFS=';' read -ra FOLDER <<< "$FOLDERS"
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job_name=$(echo "$NAME" | ${pkgs.gawk}/bin/awk -F'::' '{print $1}')
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backup_name=''${NAME#"$job_name"::}
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if ! command -v borg-job-"$job_name" &> /dev/null; then
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echo "borg-job-$job_name not found: Backup name is invalid" >&2
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exit 1
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fi
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yes y | borg-job-"$job_name" extract --list "$backup_name" "''${FOLDER[@]}"
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'')
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];
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clanCore.backups.providers.borgbackup = {
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list = "borgbackup-list";
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create = "borgbackup-create";
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restore = "borgbackup-restore";
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};
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};
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}
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