rock64-backup-sdcard.sh

#!/bin/bash

# backup full image of the SD card to arbitrary directory and keep a number of them
# requires basyn: https://github.com/stvorl/basyn

# if parameter given, override the destination (i.e. an alternative sdcard)

DEST=/mnt/eksterni/backup/rock64-microsd.img
DESTDIR=/mnt/eksterni/backup/
DESTKEEPDAYS=30


if [[ -z "$1" ]]; then
  if [[ ! -d $DESTDIR ]]; then
    echo $DESTDIR does not exist, skipping backup
    exit
  fi

  if [[ -f /tmp/nobackup ]]; then
    echo /tmp/nobackup exists, skipping backup
    exit
  fi

  if [[ $(date +%u) -eq 1 ]]; then
     mv ${DEST}.old.3.bz2 ${DEST}.old.$(date +%Y-%U).bz2
     find $DESTDIR -mtime +$DESTKEEPDAYS | xargs --no-run-if-empty rm
  else
     rm -f ${DEST}.old.3.bz2
  fi

  mv ${DEST}.old.2.bz2 ${DEST}.old.3.bz2
  mv ${DEST}.old.1.bz2 ${DEST}.old.2.bz2
  mv ${DEST}.old.bz2 ${DEST}.old.1.bz2
  pbzip2 -k -f ${DEST}.old
  rsync -a --inplace $DEST ${DEST}.old
else
  set -x
  DEST="$1"
fi

if [[ "$(stat -c %s $DEST)" -ne 15931539456 ]]; then
   echo $DEST: wrong destination size, bailing out
   exit
fi

systemctl isolate rescue-ssh
sleep 10
systemctl stop systemd-journald.socket
systemctl stop systemd-journald-audit.socket
systemctl stop systemd-journald-dev-log.socket
systemctl stop systemd-journald
systemctl stop systemd-udevd-control.socket
systemctl stop systemd-udevd-kernel.socket
systemctl stop systemd-udevd

#fuser -v -m / 2>&1 | fgrep F

[[ -t 0 ]] && VERBOSE="--progress --verbose"

/root/bin/basyn -l /dev/mmcblk1 -r $DEST -a push -m sync --buffer=4096 --chunk=1 --stat $VERBOSE
systemctl isolate default