A script to automatically create a sdcard with Arch Linux ARM for Raspberry Pi

buildpi.sh

#!/bin/bash

DEVICE=/dev/mmcblk0
MOUNTPOINT=/mnt

# Raspberry Pi 1
#IMAGE="ArchLinuxARM-rpi-latest.tar.gz"
# Raspberry Pi 2 & 3
IMAGE="ArchLinuxARM-rpi-2-latest.tar.gz"

URL="http://archlinuxarm.org/os/${IMAGE}"

if [[ $EUID -ne 0 ]]; then
  echo "This script must be run as root"
  exit 1
fi

if [ ! -b "${DEVICE}" ]; then
  echo "${DEVICE} is not a block device"
  exit 1
fi;

if mountpoint -q "${MOUNTPOINT}"; then
  echo "${MOUNTPOINT} contains a mounted filesystem. Refusing to continue"
  exit 1
fi;

wipefs --all "${DEVICE}"

sfdisk "${DEVICE}" -X dos << EOF
,100MiB,c;
,,L
EOF

echo "Formatting filesystems"

mkfs.ext4 "${DEVICE}p2"
mount "${DEVICE}p2" "${MOUNTPOINT}"

mkdir "${MOUNTPOINT}/boot"
mkfs.vfat "${DEVICE}p1"
mount "${DEVICE}p1" "${MOUNTPOINT}/boot"

if [ ! -f "${IMAGE}" ]; then
  echo "Downloading image"
  curl -O -L "${URL}"
fi

echo "Extracting filesystem"
bsdtar -xpvf "${IMAGE}" -C "${MOUNTPOINT}"

echo "Sync (this may take a long time)"
sync

echo "Unmounting filesystem"
umount -R "${MOUNTPOINT}"

echo "Done"
exit 0