126 lines
3.6 KiB
Bash
126 lines
3.6 KiB
Bash
#!/hint/bash -euE
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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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packages+=(
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# Normal runtime
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lvm2
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# Updates
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arch-install-scripts
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pv
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)
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pre_install+=(20:umorpha-disk:pre_install)
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post_install+=(20:umorpha-disk:post_install)
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umorpha-disk:pre_install() {
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local arg_mountpoint=$1
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mkdir -p "$arg_mountpoint/etc/pacman.d/hooks"
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ln -sT /dev/null "$arg_mountpoint/etc/pacman.d/hooks/90-mkinitcpio-install.hook"
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}
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umorpha-disk:post_install() {
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local arg_mountpoint=$1
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rm "$arg_mountpoint/etc/pacman.d/hooks/90-mkinitcpio-install.hook"
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rmdir "$arg_mountpoint/etc/pacman.d/hooks" || true
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########################################################################
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cat >"$arg_mountpoint/etc/mkinitcpio.conf.d/umorpha.conf" <<'EOF'
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#!/hint/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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# Insert 'umorpha-overlayfs' and 'lvm2' into HOOKS.
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for ((i=0; i<${#HOOKS[@]}; i++)); do
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if [[ ${HOOKS[i]} == filesystems ]]; then
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HOOKS=("${HOOKS[@]:0:i}" umorpha-overlayfs lvm2 "${HOOKS[@]:i}" )
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break
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fi
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done
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EOF
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cat >"$arg_mountpoint/usr/lib/initcpio/install/umorpha-overlayfs" <<-'EOF'
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#!/hint/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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build() {
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add_module 'overlay'
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add_runscript
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}
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help() {
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cat <<HELPEOF
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This hook mounts a read-only root filesystem with a persistent
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overlayfs on top of it.
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Boot parameters:
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- overlay_root
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- overlay_rootfstype
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- overlay_rootflags
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- boot
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- bootfstype
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- bootflags
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HELPEOF
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}
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EOF
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cat >"$arg_mountpoint/usr/lib/initcpio/hooks/umorpha-overlayfs" <<-'EOF'
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#!/hint/ash
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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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# args: errmsg
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umorpha_emergency_shell() {
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run_hookfunctions 'run_emergencyhook' 'emergency hook' $EMERGENCYHOOKS
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err "$*"
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echo "You are now being dropped into an emergency shell."
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launch_interactive_shell
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msg "Trying to continue (this will most likely fail) ..."
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}
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# args: /path/to/newroot
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umorpha_mount_handler() {
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local newroot="$1"
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msg ":: mounting '$root'+'$overlay_root' on real root"
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mkdir -p /run/umorpha-root/root /run/umorpha-root/overlay
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local mnt_root=/run/umorpha-root/root
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local mnt_overlay=/run/umorpha-root/overlay
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if ! mount -t "${rootfstype:-auto}" -o "ro${rootflags:+,$rootflags}" "$root" "$mnt_root"; then
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umorpha_emergency_shell "Failed to mount root '$root'"
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fi
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if ! mount -t "${overlay_rootfstype:-auto}" -o "${rwopt:-ro}${overlay_rootflags:+,$overlayrootflags}" "$overlay_root" "$mnt_overlay"; then
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umorpha_emergency_shell "Failed to mount overlay root '$overlay_root'"
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fi
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mkdir -p -- "$mnt_overlay/upperdir" "$mnt_overlay/workdir"
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if ! mount -t overlay -o "lowerdir=${mnt_root},upperdir=${mnt_overlay}/upperdir,workdir=${mnt_overlay}/workdir" umorpha-rootfs "$newroot"; then
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umorpha_emergency_shell "Failed to mount overlayfs lowerdir='${mnt_root}' overlaydir='${mnt_overlay}'"
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fi
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if [ -n "$boot" ]; then
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local bootdev
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if bootdev=$(resolve_device "$boot"); then
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case "$boot" in
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'UUID='* | 'LABEL='* | 'PARTUUID='* | 'PARTLABEL='*) : ;;
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*) boot="$bootdev" ;;
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esac
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fi
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msg ":: mounting '${boot}' on /boot"
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if ! mount -t "${bootfstype:-auto}" -o "${rwopt:-ro}${bootflags:+,$bootflags}" "$boot" "$newroot/boot"; then
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umorpha_emergency_shell "Failed to mount boot '$boot'"
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fi
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fi
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}
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run_hook() {
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export mount_handler='umorpha_mount_handler'
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}
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EOF
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}
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