152 lines
4.8 KiB
Nix
152 lines
4.8 KiB
Nix
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{
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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.localbackup;
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rsnapshotConfig = target: states: ''
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config_version 1.2
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snapshot_root ${target}
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sync_first 1
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cmd_cp ${pkgs.coreutils}/bin/cp
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cmd_rm ${pkgs.coreutils}/bin/rm
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cmd_rsync ${pkgs.rsync}/bin/rsync
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cmd_ssh ${pkgs.openssh}/bin/ssh
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cmd_logger ${pkgs.inetutils}/bin/logger
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cmd_du ${pkgs.coreutils}/bin/du
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cmd_rsnapshot_diff ${pkgs.rsnapshot}/bin/rsnapshot-diff
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retain snapshot ${builtins.toString config.clan.localbackup.snapshots}
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${lib.concatMapStringsSep "\n" (state: ''
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${lib.concatMapStringsSep "\n" (folder: ''
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backup ${folder} ${config.networking.hostName}/
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'') state.folders}
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'') states}
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'';
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in
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{
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options.clan.localbackup = {
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targets = lib.mkOption {
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type = lib.types.attrsOf (
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lib.types.submodule (
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{ name, ... }:
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{
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options = {
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name = lib.mkOption {
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type = lib.types.str;
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default = name;
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description = "the name of the backup job";
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};
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directory = lib.mkOption {
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type = lib.types.str;
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description = "the directory to backup";
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};
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mountpoint = lib.mkOption {
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type = lib.types.nullOr (lib.types.strMatching "^[a-zA-Z0-9./_-]+$");
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default = null;
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description = "mountpoint of the directory to backup. If set, the directory will be mounted before the backup and unmounted afterwards";
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};
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};
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}
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)
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);
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description = "List of directories where backups are stored";
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};
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snapshots = lib.mkOption {
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type = lib.types.int;
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default = 20;
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description = "Number of snapshots to keep";
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};
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};
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config =
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let
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setupMount =
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mountpoint:
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lib.optionalString (mountpoint != null) ''
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mkdir -p ${lib.escapeShellArg mountpoint}
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if mountpoint -q ${lib.escapeShellArg mountpoint}; then
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umount ${lib.escapeShellArg mountpoint}
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fi
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mount ${lib.escapeShellArg mountpoint}
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trap "umount ${lib.escapeShellArg mountpoint}" EXIT
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'';
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in
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lib.mkIf (cfg.targets != [ ]) {
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environment.systemPackages = [
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(pkgs.writeShellScriptBin "localbackup-create" ''
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set -efu -o pipefail
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export PATH=${
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lib.makeBinPath [
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pkgs.rsnapshot
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pkgs.coreutils
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pkgs.util-linux
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]
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}
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${lib.concatMapStringsSep "\n" (target: ''
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(
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echo "Creating backup '${target.name}'"
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${setupMount target.mountpoint}
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rsnapshot -c "${pkgs.writeText "rsnapshot.conf" (rsnapshotConfig target.directory (lib.attrValues config.clanCore.state))}" sync
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rsnapshot -c "${pkgs.writeText "rsnapshot.conf" (rsnapshotConfig target.directory (lib.attrValues config.clanCore.state))}" snapshot
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)
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'') (builtins.attrValues cfg.targets)}
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'')
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(pkgs.writeShellScriptBin "localbackup-list" ''
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set -efu -o pipefail
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export PATH=${
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lib.makeBinPath [
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pkgs.jq
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pkgs.findutils
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pkgs.coreutils
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pkgs.util-linux
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]
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}
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(${
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lib.concatMapStringsSep "\n" (target: ''
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(
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${setupMount target.mountpoint}
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find ${lib.escapeShellArg target.directory} -mindepth 1 -maxdepth 1 -name "snapshot.*" -print0 -type d \
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| jq -Rs 'split("\u0000") | .[] | select(. != "") | { "name": ("${target.mountpoint}::" + .)}'
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)
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'') (builtins.attrValues cfg.targets)
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}) | jq -s .
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'')
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(pkgs.writeShellScriptBin "localbackup-restore" ''
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set -efu -o pipefail
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export PATH=${
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lib.makeBinPath [
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pkgs.rsync
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pkgs.coreutils
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pkgs.util-linux
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pkgs.gawk
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]
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}
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mountpoint=$(awk -F'::' '{print $1}' <<< $NAME)
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backupname=''${NAME#$mountpoint::}
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mkdir -p "$mountpoint"
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if mountpoint -q "$mountpoint"; then
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umount "$mountpoint"
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fi
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mount "$mountpoint"
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trap "umount $mountpoint" EXIT
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IFS=';' read -ra FOLDER <<< "$FOLDERS"
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for folder in "''${FOLDER[@]}"; do
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rsync -a "$backupname/${config.networking.hostName}$folder/" "$folder"
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done
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'')
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];
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clanCore.backups.providers.localbackup = {
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# TODO list needs to run locally or on the remote machine
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list = "localbackup-list";
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create = "localbackup-create";
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restore = "localbackup-restore";
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};
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};
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}
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