Alpine LVM UEFI/GPT Installation

alpine-install.sh

#!/bin/sh

## wrapper to only show given device
_blkid() {
	blkid | grep "^$1:"
}

## if given device have an UUID display it, otherwise return the device
uuid_or_device() {
	local i=
	# NO_DISK_UUID can be set to a list of space-separated devices to avoid using UUIDs
	for i in $NO_DISK_UUID; do
		if [ "$i" = "$1" ]; then
			echo "$1" && return 0
		fi
	done
	case "$1" in
	/dev/md*) echo "$1" && return 0 ;;
	esac
	for i in $(_blkid "$1"); do
		case "$i" in
		UUID=*) eval $i ;;
		esac
	done
	if [ -n "$UUID" ]; then
		echo "UUID=$UUID"
	else
		echo "$1"
	fi
}

DEVICE="/dev/sda"
MNT="/mnt"
PART_BOOT="${DEVICE}1"
PART_LVM="${DEVICE}2"

## install filesystem tools
apk add \
	e2fsprogs \
	e2fsprogs-extra \
	dosfstools \
	sfdisk \
	util-linux \
  lvm2 \
	grub-efi
modprobe vfat

## environment
export USE_EFI="1"
export DISKLABEL="gpt"
export BOOTFS="vfat"
export ROOTFS="ext4"
export SWAP_SIZE=2048
export BOOT_SIZE=512

swapoff -a

wipefs -a ${DEVICE} && partprobe

## create gpt partitions
# [--EFI-BOOT-STUB--|--SWAP--|--ROOTFS--]
sfdisk --quiet --wipe-partitions always --label gpt ${DEVICE} <<EOB
label: ${DISKLABEL}
1M,${BOOT_SIZE}M,C12A7328-F81F-11D2-BA4B-00A0C93EC93B,*
,,E6D6D379-F507-44C2-A23C-238F2A3DF928
EOB

## create fat32 efi-boot filesystem
mkfs.vfat -F 32 ${PART_BOOT}

## create swap filesystem
sed -i -e /swap/d /etc/fstab
mkswap ${PART_SWAP}
printf "%s\t%s\t\t%s\t%s 0 0\n" "$(uuid_or_device ${PART_SWAP})" "none" "swap" "sw" >>/etc/fstab
swapon -a
rc-update --quiet add swap boot

## create lvm
pvcreate /dev/sda2
vgcreate vg /dev/sda2
lvcreate -L 2G vg -n swap
lvcreate -L 15G vg -n root
lvcreate -L 5G vg -n home
lvcreate -L 20G vg -n var
lvcreate -L 20G vg -n logs
lvcreate -L 80G vg -n docker

# mount working directories
mkswap /dev/vg/swap
mkfs.ext4 /dev/vg/root
mkfs.ext4 /dev/vg/home
mkfs.ext4 /dev/vg/var
mkfs.ext4 /dev/vg/logs
mkfs.ext4 /dev/vg/docker

mkdir -p ${MNT}
mount -t ext4 /dev/vg/root ${MNT}

mkdir -p ${MNT}/home
mkdir -p ${MNT}/var
mount -t ext4 /dev/vg/home ${MNT}/home
mount -t ext4 /dev/vg/var ${MNT}/var

mkdir -p ${MNT}/var/log
mkdir -p ${MNT}/var/lib/docker
mount -t ext4 /dev/vg/logs ${MNT}/var/log
mount -t ext4 /dev/vg/docker ${MNT}/var/lib/docker

## mount boot directories
mkdir -p ${MNT}/boot/efi
mount -t vfat ${PART_BOOT} ${MNT}/boot/efi

swapon /dev/vg/swap

## install alpine to disk
setup-disk -m sys ${MNT}

## unmount properly all working directories
umount ${MNT}/efi/boot
umount ${MNT}/var/lib/docker
umount ${MNT}/var/log
umount ${MNT}/home
umount ${MNT}/var
umount ${MNT}

swapoff -a
vgchange -a n