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+#!/bin/bash
+# Arch Linux Easy ZFS (ALEZ) installer 0.3
+# by Dan MacDonald 2016
+
+# Check script is being run as root
+if [[ $EUID -ne 0 ]]; then
+   echo "Arch Linux Easy ZFS installer must be run as root"
+   exit 1
+fi
+
+# Set a default locale during install to avoid mandb error when indexing man pages
+export LANG=C
+
+# Run stuff in the ZFS chroot install function
+chrun() {
+	arch-chroot /mnt /bin/bash -c "$1"
+}
+
+# List and enumerate attached disks function
+lsdsks() {
+	lsblk
+	echo -e "\nAttached disks : \n"
+	disks=(`lsblk | grep disk | awk '{print $1}'`)
+	ndisks=${#disks[@]}
+	for (( d=0; d<${ndisks}; d++ )); do
+	   echo -e "$d - ${disks[d]}\n"
+	done
+}
+
+# No frills BIOS/GPT partitioning
+read -p "Do you want to GPT partition any drives for a BIOS (non-UEFI) machine? (N/y): " dopart
+while [ "$dopart" == "y" ] || [ "$dopart" == "Y" ]; do
+  lsdsks
+  blkdev=-1
+  while [ "$blkdev" -ge "$ndisks" ] || [ "$blkdev" -lt 0 ]; do
+     read -p "Enter the number of the disk you want to partition, between 0 and $(($ndisks-1)) : " blkdev
+  done
+  read -p "ALL data on /dev/${disks[$blkdev]} will be lost? Proceed? (N/y) : " blkconf
+  if [ "$blkconf" == "y" ] || [ "$blkconf" == "Y" ]; then
+        echo "GPT partitioning /dev/${disks[$blkdev]}..."
+        parted --script /dev/${disks[$blkdev]} mklabel gpt mkpart non-fs 0% 2 mkpart primary 2 100% set 1 bios_grub on set 2 boot on
+  else
+        break
+  fi
+  read -p "Do you want to partition another device? (N/y) : " dopart
+done
+
+echo -e "\nArch Linux Easy ZFS (ALEZ) installer 0.3\n\nBy Dan MacDonald 2016\n\n"
+echo -e "Please make sure you are connected to the Internet before running ALEZ.\n\n"
+echo -e "Available partitions:\n\n"
+
+# Read partitions into an array and print enumerated
+partids=(`ls /dev/disk/by-id/*`)
+ptcount=${#partids[@]}
+for (( p=0; p<${ptcount}; p++ )); do
+   echo -e "$p - ${partids[p]}\n"
+done
+
+# Try exporting zroot pool in case previous installation attempt failed
+zfs umount -a &> /dev/null
+zpool export zroot &> /dev/null
+
+# Create zpool
+zpconf="0"
+echo -e "If you used this script to create your partitions, choose partitions ending with -part2\n\n"
+while read -p "Do you want to create a single or double disk (mirrored) zpool? (1/2) : " zpconf 
+do if (( $zpconf == 1 || $zpconf == 2 )); then
+ if [ "$zpconf" == "1" ]; then 
+   read -p "Enter the number of the partition above that you want to create a new zpool on : " zps
+   echo "Creating a single disk zpool..."
+   zpool create -f -d -o feature@async_destroy=enabled -o feature@empty_bpobj=enabled -o \
+   feature@lz4_compress=enabled -o feature@spacemap_histogram=enabled -o feature@enabled_txg=enabled zroot ${partids[$zps]}
+   break
+ elif [ "$zpconf" == "2" ]; then
+   read -p "Enter the number of the first partition : " zp1
+   read -p "Enter the number of the second partition : " zp2
+   echo "Creating a mirrored zpool..."
+   zpool create zroot mirror -f -d -o feature@async_destroy=enabled -o feature@empty_bpobj=enabled \
+   -o feature@lz4_compress=enabled -o feature@spacemap_histogram=enabled -o feature@enabled_txg=enabled ${partids[$zp1]} ${partids[$zp2]}
+   break
+ fi
+ fi
+ echo "Please enter 1 or 2"
+done 
+
+echo "Creating datasets..."
+zfs create -o mountpoint=none zroot/data
+zfs create -o mountpoint=none zroot/ROOT
+zfs create -o mountpoint=/ zroot/ROOT/default
+zfs create -o mountpoint=/home zroot/data/home
+
+# This umount is not always required but can prevent problems with the next command
+zfs umount -a
+
+echo "Setting ZFS mount options..."
+zfs set mountpoint=/ zroot/ROOT/default
+zfs set mountpoint=legacy zroot/data/home
+zpool set bootfs=zroot/ROOT/default zroot
+
+echo "Exporting and importing pool..."
+zpool export zroot
+zpool import `zpool import | grep id: | awk '{print $2}'` -R /mnt zroot
+
+echo "Installing Arch base system..."
+pacstrap /mnt base
+
+echo "Copy zpool.cache..."
+mkdir /mnt/etc/zfs
+cp /etc/zfs/zpool.cache /mnt/etc/zfs
+
+echo "Add fstab entries..."
+echo -e "zroot/ROOT/default / zfs defaults,noatime 0 0\nzroot/data/home /home zfs defaults,noatime 0 0" >> /mnt/etc/fstab
+
+echo "Add Arch ZFS pacman repo..."
+echo -e "\n[archzfs]\nServer = http://archzfs.com/\$repo/x86_64" >> /mnt/etc/pacman.conf
+
+echo "Modify HOOKS in mkinitcpio.conf..."
+sed -i 's/HOOKS=.*/HOOKS="base udev autodetect modconf block keyboard zfs filesystems"/g' /mnt/etc/mkinitcpio.conf
+
+echo "Adding Arch ZFS repo key in chroot..."
+chrun "pacman-key -r 5E1ABF240EE7A126; pacman-key --lsign-key 5E1ABF240EE7A126"
+
+echo "Installing ZFS and GRUB in chroot..."
+chrun "pacman -Sy; pacman -S --noconfirm zfs-linux grub os-prober"
+
+echo "Adding Arch ZFS entry to GRUB menu..."
+awk -i inplace '/10_linux/ && !x {print $0; print "menuentry \"Arch Linux ZFS\" {\n\tlinux /ROOT/default/@/boot/vmlinuz-linux \
+	zfs=zroot/ROOT/default rw\n\tinitrd /ROOT/default/@/boot/initramfs-linux.img\n}"; x=1; next} 1' /mnt/boot/grub/grub.cfg
+echo "Update initial ramdisk (initrd) with ZFS support..."
+chrun "mkinitcpio -p linux"
+
+echo -e "Enable systemd ZFS service...\n"
+chrun "systemctl enable zfs.target"
+
+# Write script to create symbolic links for partition ids to work around a GRUB bug that can cause grub-install to fail - hackety hack
+echo -e "ptids=(\`cd /dev/disk/by-id/;ls\`)\nidcount=\${#ptids[@]}\nfor (( c=0; c<\${idcount}; c++ )) do\ndevs[c]=\$(readlink /dev/disk/by-id/\${ptids[\$c]} | sed 's/\.\.\/\.\.\///')\nln -s /dev/\${devs[c]} /dev/\${ptids[c]}\ndone" > /mnt/home/partlink.sh
+
+echo -e "Create symbolic links for partition ids to work around a grub-install bug...\n"
+chrun "sh /home/partlink.sh"
+rm -f /mnt/home/partlink.sh
+
+lsdsks
+
+# Install GRUB
+echo -e "NOTE: If you have installed Arch onto a mirrored pool then you should install GRUB onto both disks\n"
+read -p "Do you want to install GRUB onto any of the attached disks? (N/y): " dogrub
+while [ "$dogrub" == "y" ] || [ "$dogrub" == "Y" ]; do
+  read -p "Enter the number of the disk to install GRUB to : " gn
+  if [ "$gn" -ge 0 -a "$gn" -le "$ndisks" ]; then
+        echo "Installing GRUB to /dev/${disks[$gn]}..."
+        chrun "grub-install /dev/${disks[$gn]}"
+  else
+        echo "Please enter a number between 0 and $(($ndisks-1))"
+  fi
+  read -p "Do you want to install GRUB to another disk? (N/y) : " dogrub
+done
+
+echo "Exporting the pool"
+zfs umount -a
+zpool export zroot
+
+echo "Arch ZFS installation complete"