121 lines
3.3 KiB
Text
121 lines
3.3 KiB
Text
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#!/bin/bash
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# Creates an Arch Linux ARM image e.g. for installation to an SD card
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# Adapted from https://github.com/andrewboring/alarm-images/blob/master/scripts/create-image
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# Set up script error handling see https://disconnected.systems/blog/another-bash-strict-mode for details
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set -uo pipefail
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trap 's=$?; echo "$0: Error on line "$LINENO": $BASH_COMMAND"; exit $s' ERR
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IFS=$'\n\t'
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# Ensure we are root
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if [[ $EUID -ne 0 ]]; then
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echo "This script must be run as root" 1>&2
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exit 1
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fi
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# Some useful constants
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mount="mnt" # Local directory to mount the image (automatically created/delete as needed)
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base_url="http://archlinuxarm.org/os"
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# Grab the first two arguments, using the defaults if not set
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# For example, to create a 4 gig image called archlinux-rpi-armv7.img
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# that automatically runs ./setup1 and ./setup2 inside the new root, use:
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#
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# ./create-image 4G rpi-armv7 ./setup1 ./setup2
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#
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if [ $# -lt 2 ]; then
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echo "Usage: $0 <size> <arch> <setup scripts...>"
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exit 1
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fi
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size="$1"
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shift
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arch="$1"
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shift
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file="ArchLinuxARM-${arch}-latest.tar.gz"
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image="archlinux-${arch}.img"
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# Local setup script to run inside the image
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script_sources=("$@")
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script_destdir="/setup-scripts"
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loopdev=
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# Tasks to run when the shell exits for any reason, unmount the image and
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# general cleanup
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cleanup() {
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rm -rf "${mount}${script_destdir}"
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if [[ -d "${mount}" ]]; then
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umount -R "${mount}" || true
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rmdir "${mount}" || true
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fi
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[ -n "${loopdev}" ] && losetup --detach "${loopdev}" || true
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}
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trap cleanup EXIT
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echo "==> Downloading Arch Linux ARM tarball (${file})..."
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[ ! -f "${file}" ] && aria2c "${base_url}/${file}"
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echo "==> Creating image..."
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dd if=/dev/zero of="${image}" bs=1 seek="${size}" count=0
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loopdev=$(losetup --find --show "${image}")
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echo "==> Partitioning image..."
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parted --script "${loopdev}" mklabel msdos
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parted --script "${loopdev}" mkpart primary fat32 0% 200M
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parted --script "${loopdev}" mkpart primary ext4 200M 100%
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echo "==> Formatting image..."
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bootdev=$(ls "${loopdev}"*1)
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rootdev=$(ls "${loopdev}"*2)
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mkfs.vfat -F32 ${bootdev}
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mkfs.ext4 -F ${rootdev}
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echo "==> Mounting image..."
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[ ! -d "${mount}" ] && mkdir "${mount}"
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mount "${rootdev}" "${mount}"
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[ ! -d "${mount}/boot" ] && mkdir "${mount}/boot"
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mount "${bootdev}" "${mount}/boot"
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echo "==> Installing Arch Linux ARM root tree to image..."
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tar -xpf "${file}" -C "${mount}" 2> >(grep -v "Ignoring unknown extended header keyword")
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echo "==> Installing overlay tree to image..."
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rsync -rlDvP "$(dirname $0)/overlay/" "${mount}/"
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echo "==> Setting up pacman keyring..."
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cat <<EOF | arch-chroot "${mount}"
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pacman-key --init
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pacman-key --populate archlinuxarm
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EOF
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echo "==> Setting up systemd service for expanding fs on first boot..."
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cat <<EOF | arch-chroot "${mount}"
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systemctl enable expand-rootfs
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EOF
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echo "==> Setting up setup scripts dir..."
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mkdir "${mount}${script_destdir}"
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# Run setup scripts inside new root
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for script in "${script_sources[@]}"; do
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script_dest="${script_destdir}/$(basename "$script")"
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echo "==> Installing $script to $script_dest in new root..."
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install -Dm755 "$script" "${mount}${script_dest}"
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echo "==> Running $script_dest..."
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arch-chroot "${mount}" "${script_dest}"
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echo "==> Removing $script_dest from new root..."
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rm "${mount}${script_dest}"
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done
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echo "==> Cleaning pacman cache..."
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cat <<EOF | arch-chroot "${mount}"
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yes | pacman -Scc
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EOF
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