116 lines
3.5 KiB
Bash
116 lines
3.5 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_binary umorpha-mount
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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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Standard mkinitcpio boot parameters:
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ro / rw default: 'ro' whether to mount the 'overlay' device
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and (if if there is one) the 'boot'
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device read-only or read+write
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root required device of the read-only root filesystem
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rootfstype default: 'auto' filesystem type of the 'root' device
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rootflags default: empty mount options for the 'root' device
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Additional boot parameters:
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overlay required device of the persistent overlay filesystem
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overlayfstype default: 'auto' filesystem type of the 'overlay' device
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overlayflags default: empty mount options for the 'overlay' device
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boot default: none device of the '/boot' filesystem
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bootfstype default: 'auto' filesystem type of the 'boot' device
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bootflags default: empty mount options for the 'boot' device
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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'+'$overlay' on real root"
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if ! umorpha-mount \
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--root="$root:$rootfstype:ro${rootflags:+,$rootflags}" \
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--overlay="$overlay:$overlayfstype:${rwopt:-ro}${overlayflags:+,$overlayrootflags}" \
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${boot:+--boot="$boot:$bootfstype:${rwopt:-ro}${bootflags:+,$bootflags}"} \
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--basedir=/run/umorpah-root \
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--final-mountpoint="$newroot"
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then
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umorpha_emergency_shell "Failed to mount base filesystem"
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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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