localbackup: add mounthooks
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parent
916e37eb26
commit
45212e2ba5
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@ -17,12 +17,18 @@ let
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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 ${pkgs.rsnapshot}/bin/rsnapshot-diff
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${lib.optionalString (target.preExec != null) ''
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cmd_preexec ${pkgs.writeShellScript "preexec.sh" target.preExec}
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${lib.optionalString (target.preBackupHook != null) ''
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cmd_preexec ${pkgs.writeShellScript "preexec.sh" ''
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set -efu -o pipefail
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${target.preBackupHook}
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''}
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''}
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${lib.optionalString (target.postExec != null) ''
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cmd_postexec ${pkgs.writeShellScript "postexec.sh" target.postExec}
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${lib.optionalString (target.postBackupHook != null) ''
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cmd_postexec ${pkgs.writeShellScript "postexec.sh" ''
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set -efu -o pipefail
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${target.postBackupHook}
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''}
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''}
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retain snapshot ${builtins.toString config.clan.localbackup.snapshots}
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${lib.concatMapStringsSep "\n" (state: ''
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@ -41,7 +47,7 @@ in
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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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type = lib.types.strMatching "^[a-zA-Z0-9._-]+$";
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default = name;
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description = "the name of the backup job";
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};
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@ -50,16 +56,26 @@ in
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description = "the directory to backup";
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};
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mountpoint = lib.mkOption {
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type = lib.types.nullOr (lib.types.strMatching "^[a-zA-Z0-9./_-]+$");
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type = lib.types.nullOr lib.types.str;
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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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preExec = lib.mkOption {
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mountHook = lib.mkOption {
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type = lib.types.nullOr lib.types.lines;
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default = if config.mountpoint != null then "mount ${config.mountpoint}" else null;
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description = "Shell commands to run before the directory is mounted";
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};
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unmountHook = lib.mkOption {
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type = lib.types.nullOr lib.types.lines;
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default = if config.mountpoint != null then "umount ${config.mountpoint}" else null;
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description = "Shell commands to run after the directory is unmounted";
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};
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preBackupHook = lib.mkOption {
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type = lib.types.nullOr lib.types.lines;
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default = null;
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description = "Shell commands to run before the backup";
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};
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postExec = lib.mkOption {
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postBackupHook = lib.mkOption {
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type = lib.types.nullOr lib.types.lines;
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default = null;
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description = "Shell commands to run after the backup";
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@ -81,85 +97,101 @@ in
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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 ${lib.escapeShellArg mountpoint}" EXIT
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'';
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mountHook = target: ''
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if [[ -x /run/current-system/sw/bin/localbackup-mount-${target.name} ]]; then
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/run/current-system/sw/bin/localbackup-mount-${target.name}
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fi
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if [[ -x /run/current-system/sw/bin/localbackup-unmount-${target.name} ]]; then
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trap "/run/current-system/sw/bin/localbackup-unmount-${target.name}" EXIT
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fi
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'';
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in
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lib.mkIf (cfg.targets != { }) {
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environment.systemPackages = [
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(pkgs.writeShellScriptBin "localbackup-create" ''
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set -efu -o pipefail
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export PATH=${
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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 (lib.attrValues config.clanCore.state))}" sync
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rsnapshot -c "${pkgs.writeText "rsnapshot.conf" (rsnapshotConfig target (lib.attrValues config.clanCore.state))}" snapshot
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)
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'') (builtins.attrValues cfg.targets)}
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'')
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(pkgs.writeShellScriptBin "localbackup-list" ''
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set -efu -o pipefail
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export PATH=${
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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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(${
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lib.concatMapStringsSep "\n" (target: ''
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environment.systemPackages =
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[
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(pkgs.writeShellScriptBin "localbackup-create" ''
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set -efu -o pipefail
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export PATH=${
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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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${lib.concatMapStringsSep "\n" (target: ''
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(
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${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 or ""}::" + .)}'
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${mountHook target}
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echo "Creating backup '${target.name}'"
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rsnapshot -c "${pkgs.writeText "rsnapshot.conf" (rsnapshotConfig target (lib.attrValues config.clanCore.state))}" sync
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rsnapshot -c "${pkgs.writeText "rsnapshot.conf" (rsnapshotConfig target (lib.attrValues config.clanCore.state))}" snapshot
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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#$mountpoint::}
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'') (builtins.attrValues cfg.targets)}
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'')
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(pkgs.writeShellScriptBin "localbackup-list" ''
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set -efu -o pipefail
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export PATH=${
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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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(${
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lib.concatMapStringsSep "\n" (target: ''
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(
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${mountHook target}
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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.name}::" + .)}'
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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=${
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lib.makeBinPath [
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pkgs.rsync
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pkgs.coreutils
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pkgs.util-linux
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pkgs.gawk
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]
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}
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name=$(awk -F'::' '{print $1}' <<< $NAME)
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backupname=''${NAME#$mountpoint::}
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if [[ ! -z $backupname ]]; then
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mkdir -p "$mountpoint"
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if mountpoint -q "$mountpoint"; then
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umount "$mountpoint"
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if command -v localbackup-mount-$name; then
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localbackup-mount-$name
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fi
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if command -v localbackup-unmount-$name; then
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trap "localbackup-unmount-$name" EXIT
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fi
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mount "$mountpoint"
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trap "umount $mountpoint" EXIT
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fi
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IFS=';' read -ra FOLDER <<< "$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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if [[ ! -d $backupname ]]; then
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echo "No backup found $backupname"
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exit 1
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fi
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IFS=';' read -ra FOLDER <<< "$FOLDERS"
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for folder in "''${FOLDER[@]}"; do
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rsync -a "$backupname/${config.networking.hostName}$folder/" "$folder"
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done
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'')
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]
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++ (lib.mapAttrsToList (
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name: target:
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pkgs.writeShellScriptBin ("localbackup-mount-" + name) ''
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set -efu -o pipefail
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${target.mountHook}
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''
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) (lib.filterAttrs (_name: target: target.mountHook != null) cfg.targets))
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++ lib.mapAttrsToList (
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name: target:
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pkgs.writeShellScriptBin ("localbackup-unmount-" + name) ''
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set -efu -o pipefail
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${target.unmountHook}
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''
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) (lib.filterAttrs (_name: target: target.unmountHook != null) cfg.targets);
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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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