Initial commit of restore script

diff --git a/README.md b/README.md
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+Restoration script for full linux backup
+========================================
+
+Prepare for backups
+-------------------
+
+Before you'll be able to restore your system from backup, you have to do
+backups.
+
+1. Get an USB thumb drive or external HDD big enough to hold entire
+   content of our notebook's SSD.
+2. Install gparted-live into beginning of this disk
+3. Format rest of this disk (gparted would take no more than half of GB
+at the beginning) as ext4 system
+4. Install rsnapshot on your machine and set up it to make backup into
+   ```
+   /media/${your name}/${label of your USB partition}/${hostname}
+   ```
+   If you have big usb HDD and several notebooks, you can backup all of
+   them on one medium.
+   You should backup everything including /boot/efi, although you can
+   omit mozilla cache and other thinks which are likely to change during
+   backup.
+
+5. Do first backup. Do:
+   ```
+   echo p |fdisk /dev/nvme0n1 > partitions.layout  
+
+   copy restore script into root of your backup partition.
+
+Do backup regularly
+-------------------
+
+Don't forget to insert this USB drive into your notebook and run 
+rsnapshot with appropraite argument as root on regular basis.
+
+Use alpha/beta/gamma modes of rsnapshots, so you'll store daily backups
+for last week, weekly ones for last month and several monthly ones.
+
+Restore old files occasionaly
+-----------------------------
+
+Sometimes you'll find out that you have incedently removed or modified
+some file. You can than plug your backup drive in and get yesterday's or
+week ago copy.
+
+When disaster happens
+---------------------
+
+When your SSD drive dies, or have been irrepairable  wiped out,
+or hit by trojan or cryptolocker so it is easier to wipe out then do 
+anythin else:
+
+1. Repair the hardware
+2. Insert your backup drive in USB port and boot from it. Mount your
+   second partition under, say /mnt
+3. From parted-live GUI create neccessary partitions. You can consult
+   partitions.layout file which you have created while preparing backup.
+   Don't forget create vfat partion for /boot/efi, if you are using uefi
+   boot.
+4. Mount newly created root partition under, say /target
+   and if you unse separate partions for /home, /var or anything else,
+   mount them on /target/home, /target/var etc.
+   Don't forget to mount /target/boot/ef
+5. Cd to /mnt and run 
+    ```
+    restore /target
+       ```
+    IF you keep backup for several
+    compiters on one disk or want to restore not the latest daily backup,
+    specify backup directory
+    
+       ```
+    restore mynote/beta.1 /target
+       ```
+6. Reboot and enjoy.
+
+Other uses
+----------
+
+You can use this restoration procedure when you are upgrading your main
+SSD - no need to search for USB SATA or USB NVME controller to copy data
+from old disk. That is why we don't create partitions from script. User
+may want to rearrange partition layout or just restore system on bigger
+drive.
+
+

diff --git a/restore b/restore
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+#!/bin/sh
+
+if [ -z "$1" ] || [ "$1" = "--help" ]; then
+       cat >&2 << EOH
+Usage
+
+       $0 [backup-dir] restore-mount-point
+
+This is script to restore from rsnapshot-based backup.
+It copies directory tree from backup dir to restore-mount-point
+and updaes fstab there to have correct UUIDs of partitions mounted
+underneath this mountpoint. 
+
+You have to manually create partitions and filesystems on them and mount
+it under target mount point.
+EOH
+fi
+
+if [ -z "$2" ]; then
+       # only one parameter is specified it is assumed to be target. So in
+       # the current directory must be only one backup 
+       for candidate in alpha.0/etc "$(echo ./*/alpha.0/etc)"; do
+               if [ -d "$candidate" ]; then
+                       backup="$(dirname "$candidate")"
+                       break
+               fi
+       done
+       if [ -z "$backup" ]; then
+               echo "Cannot find backup directory. Please specify it explicitely" >&2
+               exit 1
+       fi
+       restore="$1"
+else
+       backup="$1"
+       restore="$2"
+fi
+
+
+if [ ! -d "$backup/etc" ]||[ ! -d "$backup/home" ]||[ ! -d "$backup/usr" ]; then
+       echo "$backup doesn't look like full backup of unix filesystem"
+fi
+
+if [ ! -d "$restore" ]; then
+       echo "Restore mount point $restore doesn't exists" >&2
+       exit 1
+fi
+tempf=$(mktemp)
+mount|while read -r dev _ point _ type rest; do
+       case $point in
+       $restore|$restore/*)
+               uuid="$(blkid "$dev" --output export|grep '^UUID')"
+               targetpoint=${point#$restore}
+               [ -z "$targetpoint" ]&&targetpoint=/
+               fsline=$(printf "%s %12s %s   defaults  0    0" "$uuid" "$targetpoint" "$type")
+               echo "$fsline">>"$tempf"
+       ;;
+       *) 
+       :
+       ;;
+       esac
+done
+# Scan for swap partitions on the same drive
+root="$(df "$restore" --output=source|tail -1)"
+drive="${root%[0-9]}"
+for part in "$drive"*; do
+       data="$(blkid "$part" --output=export)"
+       uuid=$(echo "$data"|grep "^UUID=")
+       if echo "$data"|grep -q TYPE=swap; then
+               echo "$uuid none         swap     sw    1  0" >> "$tempf"
+       fi
+done
+while [ ! -e "$drive" ]; do
+       drive=${drive%?}
+done
+echo "Going to install boot loader on $drive"
+#read fstab and copy out all lines which do not start with UUID
+while read -r line; do
+       case "$line" in
+       UUID=*) 
+               if  [ -e "$tempf" ]; then
+               cat "$tempf"
+               rm "$tempf"
+               fi
+               ;;
+       *)
+               echo "$line"
+               ;;
+       esac
+done < "$backup/etc/fstab" > /tmp/fstab.new
+#  restoring backup
+echo "Restoring data"
+rsync -a "$backup/" "$restore/" || exit 1
+echo "Updatinf fstab"
+cp /tmp/fstab.new "$restore/etc/fstab"
+rm "$restore/etc/udev/rules.d"/*-persistent-net.rules
+echo "Installing bootloader"
+mount -t proc none "$restore/proc"
+mount -o bind /dev "$restore/dev"
+mount -t sysfs sys "$restore/sys"
+chroot "$restore" update-grub
+chroot "$restore" grub-install "$drive"
+umount "$restore/sys"
+umount "$restore/dev"
+umount "$restore/proc"
+
+echo "Restore completed. Please reboot"
+
+       
+