121 lines
3.4 KiB
Bash
Executable File
121 lines
3.4 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Copyright (C) 2023 Umorpha Systems
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# SPDX-License-Identifier: AGPL-3.0-or-later
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set -euE -o pipefail
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v() {
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printf >&2 ' $ %s\n' "${*@Q}"
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"$@"
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}
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main() {
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local rootfs size
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case "$1" in
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*rootfs*)
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rootfs="$1"
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size=$(stat --format='%s' -- "$rootfs")
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;;
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--stdin=*)
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rootfs=/dev/stdin
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size=${1#--stdin=}
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;;
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*)
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echo >&2 "!! Filename '${1}' does not look like a rootfs filename"
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return 2
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;;
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esac
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########################################################################
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cleanup=()
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_do_cleanup() {
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if [[ $? == 0 ]]; then
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echo ":: Cleaning up..."
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else
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echo >&2 "!! ERROR! Cleaning up..."
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fi
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for (( i=${#cleanup[@]}-1; i >= 0; i-- )); do
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eval "${cleanup[$i]}"
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done
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}
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trap '_do_cleanup' EXIT
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########################################################################
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local booted other
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booted=$(awk '$2 == "/run/umorpha-root/root"{print $1}' </proc/mounts)
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booted=${booted##*_}
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if [[ $booted == a ]]; then
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other=b
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else
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other=a
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fi
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echo ":: Installing '${rootfs}' to slot '$other'"
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v rm -f -- "/boot/grub/grub_$other.cfg"
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if [[ -e /dev/mapper/vg_umorpha-lv_root_$other ]]; then
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# Ugg, lvresize exits with non-zero for no-ops, which we can't
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# even really do a pre-flight check for since it might round a
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# size up.
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v lvresize --size="${size}b" "/dev/mapper/vg_umorpha-lv_root_$other" || true
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else
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v lvcreate --zero=y --wipesignatures=y --yes --name="lv_root_$other" \
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--size="${size}b" vg_umorpha
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fi
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if [[ "$rootfs" == /dev/stdin ]]; then
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v pv --size="${size}" >"/dev/mapper/vg_umorpha-lv_root_$other"
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else
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v pv -- "$rootfs" >"/dev/mapper/vg_umorpha-lv_root_$other"
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fi
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########################################################################
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local tmpdir
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tmpdir="$(mktemp -dt "${0##*/}.XXXXXXXXXX")"
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cleanup+="rmdir -- ${tmpdir@Q}"
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########################################################################
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echo ":: Configuring boot"
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local selector_boot selector_root selector_overlay
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selector_root="$( blkid --output=export "/dev/mapper/vg_umorpha-lv_root_$other" | grep ^UUID=)"
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selector_boot="$( xargs -a /proc/cmdline printf '%s\n' | sed -n 's/^boot=//p')"
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selector_overlay="$(xargs -a /proc/cmdline printf '%s\n' | sed -n 's/^overlay_root=//p')"
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v declare -p selector_boot selector_root selector_overlay
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mkdir "$tmpdir/mnt"
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cleanup+=("rmdir -- ${tmpdir@Q}/mnt")
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v mount -o ro -- "/dev/mapper/vg_umorpha-lv_root_$other" "$tmpdir/mnt"
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cleanup+=("v umount ${tmpdir@Q}/mnt")
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v mount -o bind -- /etc/mkinitcpio.d "${tmpdir}/mnt/etc/mkinitcpio.d"
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cleanup+=("v umount ${tmpdir@Q}/mnt/etc/mkinitcpio.d")
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v mount -o bind -- /boot "${tmpdir}/mnt/boot"
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cleanup+=("v umount ${tmpdir@Q}/mnt/boot")
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{
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for krnl in "$tmpdir/mnt"/usr/lib/modules/*/vmlinuz; do
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pkgbase=$(cat -- ${krnl%vmlinuz}pkgbase)
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cat <<-EOF
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menuentry 'Parabola GNU/Linux-libre, slot ${other}, ${pkgbase} kernel'
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set search --no-floppy --fs-uuid --set=root ${selector_boot#UUID=}
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echo 'Loading ${pkgbase} kernel...'
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linux /vmlinuz-${pkgbase} root=$selector_root overlay_root=$selector_overlay boot=$selector_boot rw
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echo 'Loading initial ramdisk...'
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initrd /initramfs-${pkgbase}.img
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echo 'Booting...'
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boot
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EOF
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done
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} | install -Dm600 /dev/stdin "/boot/grub/grub_$other.cfg"
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v arch-chroot -- "$tmpdir/mnt" sh -c "printf '%s\n' usr/lib/modules/*/vmlinuz | /usr/share/libalpm/scripts/mkinitcpio install"
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}
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main "$@"
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