Create the best ghetto backup script of september 2016

ghetto/backup/create_diskimage.sh

@@ -0,0 +1,180 @@
+#!/bin/bash
+
+shopt -s extglob
+
+PARANOIA_DELAY=30
+PARANOIA_SEQ=`echo "$PARANOIA_DELAY - 1" | bc`
+HOSTNAME="$1"
+TARGET="$2"
+DEST=$TARGET/$HOSTNAME
+FS="ext2 ext3 ext4 reiserfs reiser4 xfs jfs btrfs ntfs"
+
+nltos() {
+  sed -e ':a;N;$!ba;s/\n/ /g'
+}
+display_syntax() {
+  echo "Syntax: create_diskimage.sh <hostname> <target>"
+  echo ""
+  echo "<hostname> is the name of the host you are creating the image for"
+  echo "<target> is the directory into which the backup should be created"
+  echo "         backups are placed into \$target/\$hostname/ (created as needed)"
+  echo ""
+  exit 2
+}
+
+if [[ $EUID -ne 0 ]]; then
+  echo "This script must be run as root, figure out a way to make that work..."
+  exit 5
+fi
+
+if [ -z "$HOSTNAME" ]; then
+  echo "No hostname specified"
+  display_syntax
+fi
+if [ -z "$TARGET" ]; then
+  echo "No target directory specified"
+  display_syntax
+fi
+if [ ! -d $TARGET ]; then
+  echo "Target directory doesn't exist"
+  display_syntax
+fi
+if [ -d $DEST ]; then
+  echo "Backup directory '$DEST' already exists, please remove before running again..."
+  exit -1
+fi
+
+DISKGUESS=`(cd /dev/; ls [shv]d[a-z]* | grep -v '[0-9]') | nltos`
+PARTGUESSRAW=`lsblk -nl | grep -v 'dm' | awk '$6 == "part" { print $1 }' | nltos`
+
+PVS=`vgs -o +pv_name --noheadings | awk '{print $NF}' | nltos | sed -e 's/\/dev\///g'`
+VGS=`vgs --noheadings | awk '{print $1}'`
+LVS=`find /dev/mapper -type l | grep -v swap | nltos`
+
+PARTGUESSFS=$PARTGUESSRAW
+for pv in $PVS; do
+  PARTGUESSFS=${PARTGUESSFS//$pv?()}
+done
+
+for part in $PARTGUESSFS; do
+  TYPE=""
+  eval $(blkid /dev/$part | awk ' { print $3 } ')
+  if [[ $FS == *"$TYPE"* ]] && [ -n "$TYPE" ]; then
+    PARTGUESS="$PARTGUESS $part"
+  fi
+done
+
+PARTGUESS=`echo $PARTGUESS | xargs`
+
+printf "Which disks [$DISKGUESS]: "
+read DISKS
+echo
+
+echo "Now we need a list of \"raw\" partitions to back up.  The utility we're using"
+echo "'fsarchiver' doesn't support backing up swap (for good reason).  If you"
+echo "specify a swap partition here, the backup will fail.  In addition, we detect"
+echo "the LVM partitions automatically, so only specify the non-lvm, non-swap"
+echo "partitions.  Generally this is only the device for /boot (normally sda1)"
+echo ""
+printf "Which non-lvm partitions [$PARTGUESS]: "
+read PARTS
+echo
+
+if [ -z "$DISKS" ]; then
+  DISKS=$DISKGUESS
+  if [ -z "$DISKS" ]; then
+    echo "No source disks specified"
+    display_syntax
+  fi
+fi
+if [ -z "$PARTS" ]; then
+  PARTS=$PARTGUESS
+  if [ -z "$PARTS" ]; then
+    echo "No source partitions specified"
+    display_syntax
+  fi
+fi
+
+echo "Performing a backup of the following to the directory '$DEST':"
+echo "  Disks: $DISKS"
+echo "  Partitions: $PARTS"
+echo "  Volume Groups: $VGS"
+echo "  Logical Volumes: $LVS"
+echo ""
+echo ""
+echo "We're about to do work, your warranty is about to expire..."
+printf "$PARANOIA_DELAY seconds..."
+for i in `seq $PARANOIA_SEQ -1 0`; do
+  sleep 1
+  printf "\r$i seconds... \b"
+done
+echo -e "\rexpired!        "
+echo ""
+
+echo "-- [$DEST] Creating directory"
+mkdir $DEST
+echo ""
+
+for disk in $DISKS; do
+  echo "-- [$disk] Backing up MBR"
+  dd if=/dev/$disk of=$DEST/$disk.mbr bs=512 count=1
+  echo "-- [$disk] Backing up partition layout"
+  sfdisk -d /dev/$disk > $DEST/$disk.part
+done
+echo ""
+
+for vg in $VGS; do
+  echo "-- [$vg] Backing up LVM layout..."
+  vgcfgbackup -f $DEST/$vg.vgcfg $vg
+done
+echo ""
+
+echo "-- Starting fsarchiver, this will take some time..."
+LABEL=`date +"$HOSTNAME-%Y%m%d%H%M%S-backup"`
+FULLPARTS=`echo $PARTS | sed 's/[^ ]* */\/dev\/&/g'`
+fsarchiver savefs -j4 -L "$LABEL" -o $DEST/fsarchive.fsa $FULLPARTS $LVS
+
+echo "-- Recording data to make a restore easier..."
+echo "exit # Ha, you thought i was gonna make this easy?" > $DEST/restore.sh
+echo "DEST=$DEST" >> $DEST/restore.sh
+
+for disk in $DISKS; do
+  echo "sfdisk /dev/$disk < \$DEST/$disk.part" >> $DEST/restore.sh
+  echo "dd if=\$DEST/$disk.mbr of=/dev/$disk.mbr bs=512 count=1" >> $DEST/restore.sh
+done
+
+for vg in $VGS; do
+  pv=`vgs -o +pv_name --noheadings $vg | awk '{print $NF}'`
+  uuid=`pvs -o +uuid --noheadings $pv | awk '{print $NF}'`
+  echo "pvcreate --uuid $uuid --restorefile \$DEST/$vg.vgcfg $pv" >> $DEST/restore.sh
+  echo "vgcfgrestore -f \$DEST/$vg.vgcfg $vg" >> $DEST/restore.sh
+  echo "vgchange -a y $vg" >> $DEST/restore.sh
+done
+
+id=0
+RESTOREFLAGS=""
+for fs in $FULLPARTS $LVS; do
+  RESTOREFLAGS="$RESTOREFLAGS id=$id,dest=$fs"
+  id=`echo "$id + 1" | bc`
+done
+
+echo "fsarchiver restfs $RESTOREFLAGS" >> $DEST/restore.sh
+echo "" >> $DEST/restore.sh
+echo "# Now for the hard part, I know you can do it!" >> $DEST/restore.sh
+echo "#   mount /dev/mapper/<system-root> /mnt/backup" >> $DEST/restore.sh
+echo "#   mount -o bind /dev /mnt/backup/dev" >> $DEST/restore.sh
+echo "#   mount <system-boot> /mnt/backup/boot" >> $DEST/restore.sh
+echo "#   chroot /mnt/backup /bin/bash" >> $DEST/restore.sh
+echo "#   grub-install <boot-device (/dev/sda)>" >> $DEST/restore.sh
+echo "#   exit" >> $DEST/restore.sh
+echo "#   umount /mnt/backup/boot" >> $DEST/restore.sh
+echo "#   umount /mnt/backup/dev" >> $DEST/restore.sh
+echo "#   umount /mnt/backup" >> $DEST/restore.sh
+echo "#" >> $DEST/restore.sh
+echo "# The good news is you're done.  umount the partition the backups live" >> $DEST/restore.sh
+echo "# on, repeat the team mantra, and reboot" >> $DEST/restore.sh
+
+echo ""
+echo ""
+echo "All done, to view contents, run: 'fsarchiver archinfo $DEST/fsarchive.fsa'"
+exit 0