"Arch By Hand" UEFI GPT SSD LUKS Install Script

Question

Arch UEFI GPT LUKS (and non LUKS version) Automated Install Example Script, SSD friendly
Please note that if you're going to use this you're going to have to a) customize it to fit your needs and b) know what system config you need to do post install (rc.* etc). It's a jumping off point.
Want to put in a lot of effort just to get Arch Linux listed in your "bios" startup options? You're in the right post! Well, it's more than just that, of course. If you have an EFI machine, increasingly common, this might be of interest.
I got this working on my x220 tablet and thought I'd post it here. I imagine that as Archboot and the official installer rev we'll see them support this kind of thing as well, so BBS seemed like a good place to post it, but if there is an appropriate wiki location I could add it there as well.
This is pretty bare bones (otherwise you'd be using AIF or Archboot, natch) and should be customized for your own install purposes. Nonetheless, I suspect others may have been banging their heads on the low overhang of UEFI/GPT install and hope this helps them get up and running.
This is pretty much all in the wiki and BBS in various places, particularly the GRUB2 wiki entry. However the GPT partitioning (and learning more of sgdisk) were challenging enough that I felt it would be useful for others to see a working script.
I used the current-as-of-this-post Archboot iso (archlinux-2011.10-1-archboot.iso).
Don't just dd the archlinux iso to a usb. Format the USB stick as an MBR FAT drive and dump the entire Archboot ISO contents to it. To be honest, I did this in an Ubuntu vmware image I had on my mac, though I'd like to include command line options for doing this. TODO!
I also stuck the script (included herein) on the drive, but you could get it on the installation image at install time as well via scp or whatever you prefer.
On my x220 I then set the UEFI "BIOS" (the UEFI setup) to boot *ONLY* from UEFI. Pretty important. You should probably also stack your USB drive to top of your startup list or manually select it at boot time.
Boot from the USB stick. For my x220 I selected the second of the four efi grub options, x86_64.
Once Archboot is up, immediately leave the installer (option 8)
You may want to mount the usb drive to /src if you stuck this script on it. Archboot in UEFI mode doesn't seem to mount the usb drive properly (and the normal Archboot efi install will fail as well due to this). I think this is getting fixed in the next Archboot release, from what I've read on BBS.
# mount /dev/sdb1 /src
Run the script. For me this is
# /src/myarch.sh
(WARNING: will nuke everything on /dev/sda unless you've changed it).
There are probably things that could be done better/cleaner, feel free to point those out. This is really just a jumping off point.
UPDATE 15 NOV 2011: This now sources most packages locally to avoid kernel mismatch between install medium and install target.
UPDATE 16 NOV 2011: Script now unified the boot and efi partitions.
UPDATE 17 NOV 2011: Migrated code to github, including two versions (non-encrypted and LUKS-encrypted)
UPDATE 18 NOV 2011: Added encrypted swap
UPDATE 18 NOV 2011: Changed /boot/efi/grub to /boot/grub; removed extraneous /boot/efi directory entirely.
UPDATE 19 NOV 2011: Added a post-install script to handle user setup, etc. No reboot required.
UPDATE 20 NOV 2011: Post install section more complete, visudo automation added.
See code at: https://github.com/altercation/arch-by-hand
Last edited by altercation (2011-11-20 21:09:33)

Answer 1

I've come up with this script (although it's not quite right either):
#!/bin/bash
# prereqs:
# mount /dev/sdb1 /src
set -o nounset
#set -o errexit
INSTALL_TARGET="/mnt"
HR="--------------------------------------------------------------------------------"
# Initialize
# Warn
timer=9
echo -n "This procedure will completely format /dev/sda. Please cancel with ctrl-c to cancel within $timer seconds..."
while [[ $timer -gt 0 ]]
do
sleep 1
let timer-=1
echo -en "$timer seconds..."
done
echo "Starting"
# Configure_Host
echo -e "\nFormatting disk...\n$HR"
# disk prep
sgdisk -Z /dev/sda # zap all on disk
sgdisk -a 2048 -o /dev/sda # new gpt disk 2048 alignment
# create partitions
sgdisk -n 1:0:+250M /dev/sda # partition 1 (UEFI BOOT), default start block, 250MB
sgdisk -n 2:0:+2G /dev/sda # partition 2 (SWAP), default start block, 2G
sgdisk -n 3:0:+100M /dev/sda # partition3, (BOOT), boot partition
sgdisk -n 4:0:+10G /dev/sda # partition 4, (ARCH), default start, remaining space
sgdisk -n 5:0:0 /dev/sda # partition 5, (HOME)
# set partition types
sgdisk -t 1:ef00 /dev/sda
sgdisk -t 2:8200 /dev/sda
sgdisk -t 3:8300 /dev/sda
sgdisk -t 4:8300 /dev/sda
sgdisk -t 5:8300 /dev/sda
# label partitions
sgdisk -c 1:"UEFI BOOT" /dev/sda
sgdisk -c 2:"SWAP" /dev/sda
sgdisk -c 3:"BOOT" /dev/sda
sgdisk -c 4:"ARCH" /dev/sda
sgdisk -c 5:"HOME" /dev/sda
# make filesystems
echo -e "\nCreating Filesystems...\n$HR"
mkfs.vfat /dev/sda1
mkswap /dev/sda2
mkfs.ext2 /dev/sda3
mkfs.ext4 /dev/sda4
mkfs.ext4 /dev/sda5
# Run /arch/setup
echo -n "Don't select Grub as your bootloader and exit setup before the Install Bootloader step"
/arch/setup
# unmount filesytems
umount /dev/sda1
swapoff /dev/sda2
umount /dev/sda3
umount /dev/sda5
# Get Network
echo -n "Waiting for network address.."
#dhclient eth0
dhcpcd -p eth0
echo -n "Network address acquired."
# Update Pacman
echo -e "\nUpdating pacman...\n$HR"
sed -i "s/^#S/S/" /etc/pacman.d/mirrorlist
pacman --noconfirm -Sy
pacman --noconfirm --needed -S pacman
pacman --noconfirm -S gptfdisk btrfs-progs-unstable
# Prepare to chroot to target
mv ${INSTALL_TARGET}/etc/resolv.conf ${INSTALL_TARGET}/etc/resolv.conf.orig
cp /etc/resolv.conf ${INSTALL_TARGET}/etc/resolv.conf
sed -i "s/^#S/S/" ${INSTALL_TARGET}/etc/pacman.d/mirrorlist
mount -t proc proc ${INSTALL_TARGET}/proc
mount -t sysfs sys ${INSTALL_TARGET}/sys
mount -o bind /dev ${INSTALL_TARGET}/dev
echo -e "${HR}\nINSTALL BASE COMPLETE\n${HR}"
# Write Files
# install_efi (to be run *after* chroot /install)
touch ${INSTALL_TARGET}/install_efi
chmod a+x ${INSTALL_TARGET}/install_efi
cat > ${INSTALL_TARGET}/install_efi <<EFIEOF
mount /boot
mount /boot/efi
modprobe efivars
modprobe dm-mod
pacman --noconfirm -Sy
pacman --noconfirm --needed -S pacman
pacman --noconfirm -R grub
pacman --noconfirm -S grub2-efi-i386
grub_efi_i386-install --root-directory=/boot/efi --boot-directory=/boot/efi/efi --bootloader-id=grub --no-floppy --recheck
efibootmgr --create --gpt --disk /dev/sda --part 1 --write-signature --label "ARCH LINUX" --loader "\\EFI\\grub\\grub.efi"
grub-mkconfig -o /boot/efi/efi/grub/grub.cfg
exit
EFIEOF
# Install EFI
chroot /install /install_efi
rm /install/install_efi