umorpha-boxes/modules/umorpha-bootstrap.sh

#!/hint/bash -euE
# Copyright (C) 2023-2024  Umorpha Systems
# SPDX-License-Identifier: AGPL-3.0-or-later

load_module "$(dirname -- "${BASH_SOURCE[0]}")/base-net.sh"

packages+=(
	# Things to put in the initramfs:
	#bash       # base
	#coreutils  # base
	#grep       # base
	#systemd    # base
	#util-linux # base
	arch-install-scripts
	dosfstools
	e2fsprogs
	lvm2
	pv

	# Other
	jq
	libisoburn
	mkinitcpio-netconf
	syslinux
)

pre_install+=(20:bootstrap:pre_install)
bootstrap:pre_install() {
	local arg_mountpoint=$1

	# The `keymap` mkinitcpio hook looks at locale.conf to
	# determine whether to enable Unicode.  This is important so
	# that the output of `systemd-repart` is readable.
	install -Dm644 /dev/stdin "${arg_mountpoint}/etc/locale.conf" <<-EOF
		LANG=en_US.UTF-8
	EOF

	install -Dm644 /dev/stdin "$arg_mountpoint/etc/mkinitcpio.conf.d/umorpha-bootstrap.conf" <<'EOF'
#!/hint/bash
# Copyright (C) 2023  Umorpha Systems
# SPDX-License-Identifier: AGPL-3.0-or-later

# Remove 'kms' and 'fsck' from HOOKS.
for ((i=0; i<${#HOOKS[@]}; i++)); do
	if [[ ${HOOKS[i]} == kms ]] || [[ ${HOOKS[i]} == fsck ]]; then
		HOOKS=("${HOOKS[@]:0:i}" "${HOOKS[@]:i+1}")
	fi
done

# Insert 'umorpha-bootstrap' and 'lvm2' into HOOKS.
for ((i=0; i<${#HOOKS[@]}; i++)); do
	if [[ ${HOOKS[i]} == filesystems ]]; then
		HOOKS=("${HOOKS[@]:0:i}" umorpha-bootstrap lvm2 "${HOOKS[@]:i}" )
		break
	fi
done
EOF

	install -Dm644 /dev/stdin "$arg_mountpoint/usr/lib/initcpio/install/umorpha-bootstrap" <<'EOF'
#!/hint/bash
# Copyright (C) 2023  Umorpha Systems
# SPDX-License-Identifier: AGPL-3.0-or-later

build() {
	add_module cdrom
	add_binary eject

	add_checked_modules /drivers/net/
	add_binary ip
	add_binary /usr/lib/initcpio/ipconfig /sbin/ipconfig
	add_binary curl
	add_file   /etc/ssl/certs/ca-certificates.crt
	add_binary jq
	add_binary systemd-sysusers

	add_runscript

	add_binary umorpha-install
	add_binary umorpha-mount
	add_binary arch-chroot
	add_binary bash
	add_binary chroot
	add_binary readlink
	add_binary pv
	add_binary systemd-repart
	add_binary mkfs.ext4
	add_binary mkfs.vfat
	add_binary lvcreate
	add_binary lvresize
	add_binary pvcreate
	add_binary pvs
	add_binary vgchange
	add_binary vgcreate
	add_binary vgremove
	add_binary vgs
}

help() {
	cat <<HELPEOF
This hook mounts the CD and runs 'umorpha-install' on the rootfs.img
found there.

Boot parameters:
 - iso: the ISO disk device
HELPEOF
}
EOF

	install -Dm644 /dev/stdin "$arg_mountpoint/usr/lib/initcpio/hooks/umorpha-bootstrap" <<'EOF'
#!/hint/ash
# Copyright (C) 2023  Umorpha Systems
# SPDX-License-Identifier: AGPL-3.0-or-later

# args: errmsg
umorpha_emergency_shell() {
	run_hookfunctions 'run_emergencyhook' 'emergency hook' $EMERGENCYHOOKS
	err "$*"
	echo "You are now being dropped into an emergency shell."
	launch_interactive_shell
	msg "Trying to continue (this will most likely fail) ..."
}

# args: /path/to/newroot
bootstrap_mount_handler() {
	local newroot="${1}"

	local isodev
	if ! isodev=$(resolve_device "$iso"); then
		umorpha_emergency_shell "Failed to resolve device '$iso'"
	fi
	case "$iso" in
		'UUID='* | 'LABEL='* | 'PARTUUID='* | 'PARTLABEL='*) : ;;
		*) iso="$isodev" ;;
	esac

	if ! mount --mkdir -o ro "$iso" /mnt/iso; then
		umorpha_emergency_shell "Failed to mount iso '$iso'"
	fi

	msg "- [umorpha-install] ------------------------------------------------------------"
	ln -s /tmp /var/tmp
	mkdir /dev/pts /dev/shm
	if ! umorpha-install bios /mnt/iso/rootfs.img /dev/vda; then
		umorpha_emergency_shell "Failed to install rootfs to /dev/vda"
	fi
	eject /mnt/iso

	msg "- [netconf] --------------------------------------------------------------------"
	out=$(ipconfig ip=dhcp 2>&1)
	echo "$out"
	echo "$out" | grep -o 'dns[0-9]*\s*:\s*\S*' | sed 's/.*:/nameserver /' >/etc/resolv.conf

	msg "- [cloud-init] -----------------------------------------------------------------"
	if ! curl --fail-with-body -H 'Metadata-Token: cloudinit' http://169.254.169.254/v1.json >/vultr-v1.json; then
		umorpha_emergency_shell "Failed to download '/vultr-v1.json'"
	fi
	if ! jq -r '.["user-data"]' </vultr-v1.json >/cloud-init-user-data; then
		umorpha_emergency_shell "Failed to parse '/vultr-v1.json'"
	fi
	if [ "$(head -c2 /cloud-init-user-data)" != '#!' ]; then
		echo ":: /cloud-init-user-data does not look like a script, skipping"
	else
		chmod 755 /cloud-init-user-data
		if ! /cloud-init-user-data; then
			umorpha_emergency_shell "Failed to run '/cloud-init-user-data'"
		fi
		echo
	fi

	# Right now, in the successful case, this won't run.  The
	# /cloud-init-user-data probably called the Vultr API to detach the
	# ISO, which halts the VM before the HTTP response comes back.
	# So that `curl` call never gets to finish, and this never gets to run.
	#
	# 2024-02-12: Looks like iso/detach no longer halts the VM?

	msg "- [reboot] ---------------------------------------------------------------------"
	reboot -f
}

run_hook() {
	export mount_handler='bootstrap_mount_handler'
}
EOF

	install -Dm755 "$(dirname -- "${BASH_SOURCE[0]}")/../bin/umorpha-install" "$arg_mountpoint/usr/bin/umorpha-install"
	install -Dm755 "$(dirname -- "${BASH_SOURCE[0]}")/../bin/umorpha-mount"   "$arg_mountpoint/usr/bin/umorpha-mount"
}

post_install+=(20:bootstrap:post_install)
bootstrap:post_install() {
	local arg_mountpoint=$1

	chmod 644 -- "$arg_mountpoint"/boot/initramfs*.img
	rm -rf "$arg_mountpoint"/boot/syslinux

	mkdir -p -- "$arg_mountpoint/boot/isolinux"
	ln -sr -t "$arg_mountpoint/boot/isolinux" -- \
	   "$arg_mountpoint/usr/lib/syslinux/bios/isolinux.bin" \
	   "$arg_mountpoint/usr/lib/syslinux/bios/ldlinux.c32"
	install -Dm644 /dev/stdin "$arg_mountpoint/boot/isolinux/syslinux.cfg" <<-EOF
		DEFAULT boot
		LABEL boot
		  LINUX      /vmlinuz-linux-libre
		  INITRD     /initramfs-linux-libre.img
	EOF
}