{ pkgs, lib, hostName, ... }: with builtins; { # Show what's happening to the user systemd.services."zfs-term@" = { description = "ZFS terminal for: %I"; unitConfig.StopWhenUnneeded = false; environment.DISPLAY = ":0"; environment.XAUTHORITY = "/home/sevy/.Xauthority"; after = [ "graphical.target" ]; serviceConfig = { Type = "simple"; PrivateTmp = true; ExecStart = pkgs.writeShellScript "zfs-term" '' DESTPOOL=$1 set -eux ${pkgs.xterm}/bin/xterm -fg white -bg black -fa Monospace -fs 6 \ -title "ZFS backup to: $DESTPOOL" -e "journalctl -f -o short \ -u zfs-force-import@$DESTPOOL \ -u zfs-local-backup-home@$DESTPOOL" '' + " %I"; }; }; # Force zpool import, even if the disk has not been exported, or has been imported on another computer systemd.services."zfs-force-import@" = { description = "ZFS force import: %I"; unitConfig = { StartLimitBurst = 5; StartLimitInterval = 200; StopWhenUnneeded = true; }; wants = [ "zfs-term@%i.service" ]; bindsTo = [ "sys-subsystem-usb-%i.device" ]; path = lib.mkBefore [ "/run/booted-system/sw" ]; serviceConfig = { Type = "oneshot"; RemainAfterExit = true; PrivateTmp = true; SyslogIdentifier = "zfs-force-import@%i"; Restart = "on-failure"; ExecStart = pkgs.writeShellScript "zfs-force-import" '' DESTPOOL=$1 set -eux # Import the zpool, using stable paths zpool import -d /dev/disk/by-id/ || true zpool import -lFd /dev/disk/by-id/ "$DESTPOOL" || zpool reopen "$DESTPOOL" || zpool import -f -d /dev/disk/by-id/ "$DESTPOOL" || zpool clear -nFX "$DESTPOOL" '' + " %I"; }; }; # Prune old snapshots on the backup and send new ones systemd.services."zfs-local-backup-home@" = { description = "ZFS backup home, on: %I"; wants = [ "zfs-term@%i.service" ]; after = [ "zfs-force-import@%i.service" ]; requires = [ "zfs-force-import@%i.service" ]; bindsTo = [ "sys-subsystem-usb-%i.device" ]; path = lib.mkBefore [ "/run/booted-system/sw" ]; serviceConfig = rec { Type = "oneshot"; PrivateTmp = true; CacheDirectory = [ "zfs-usb-backup/%I" ]; RuntimeDirectory = [ "zfs-usb-backup/%I" ]; User = "sevy"; Group = "users"; SyslogIdentifier = "zfs-local-backup-home@%i"; ExecStartPre = "+" + pkgs.writeShellScript "zfs-local-backup-home-startPre" '' DESTPOOL=$1 set -eux if zpool status "$DESTPOOL"; then zfs allow ${User} bookmark,hold,mount,send ${hostName}/home zfs allow ${User} bookmark,create,destroy,load-key,mount,mountpoint,receive,rollback,snapshot "$DESTPOOL"/${User} zpool scrub -p "$DESTPOOL" || true fi '' + " %I"; ExecStart = pkgs.writeShellScript "zfs-local-backup-home" '' set -eu DESTPOOL=$1 # sanoid is quite conservative: # by setting hourly=24, a snapshot must be >24 hours old # and there must been >24 total hourly snapshots, # or nothing is pruned. install -D -m 400 /dev/stdin /tmp/sanoid/sanoid.conf <<EOF [template_remote] autoprune=true autosnap=false process_children_only=false [$DESTPOOL/${User}/backup/${hostName}/home] hourly=12 daily=31 monthly=6 recursive=true use_template=remote EOF set -x ${pkgs.sanoid}/bin/sanoid \ --cache-dir /var/cache/zfs-usb-backup/"$DESTPOOL" \ --configdir /tmp/sanoid \ --prune-snapshots \ --run-dir /run/zfs-usb-backup/"$DESTPOOL" \ --verbose for dataset in ${hostName}/home; do ${pkgs.sanoid}/bin/syncoid \ --create-bookmark \ --exclude "home/Downloads" \ --exclude "home/Videos" \ --force-delete \ --no-privilege-elevation \ --no-sync-snap \ --recursive \ --recvoptions "" \ --sendoptions raw \ --skip-parent \ "$dataset" \ "$DESTPOOL"/${User}/backup/"$dataset" done '' + " %I"; ExecStartPost = "+" + pkgs.writeShellScript "zfs-local-backup-home-startPost" '' DESTPOOL=$1 set -eux # Only if the zpool still exists to avoid uninterruptible hanging if zpool status -v "$DESTPOOL"; then # Scrub the zpool 1 minute (in the background) zpool scrub "$DESTPOOL" sleep 60 fi while zpool status -v "$DESTPOOL"; do zpool scrub -p "$DESTPOOL" || true sleep 20 # Export the zpool (to avoid a forced import later on) zpool export "$DESTPOOL" || true done systemctl --no-block stop zfs-term@"$DESTPOOL" '' + " %I"; }; }; programs.bash.interactiveShellInit = '' mount-zfs-backup () { ( set -eux zpool="$1" zpool status "$zpool" 2>/dev/null || sudo zpool import -d /dev/disk/by-id/ "$zpool" trap "sudo zpool export $zpool" EXIT zfs list -rH -t filesystem -o mounted,mountpoint,name "$zpool"/"$USER"/backup | grep "^no\\s*/" | cut -f 3 | xargs -ortL1 sudo zfs mount -Olv || true ${pkgs.mate.caja-with-extensions}/bin/caja --browser /mnt/"$zpool"/"$USER"/backup ) } ''; }