# Copyright (c) 2018 Yash Jain, 2022 IBM Corp.
#
# SPDX-License-Identifier: Apache-2.0

build_dbus() {
	local rootfs_dir=$1
	ln -sf /lib/systemd/system/dbus.service $rootfs_dir/etc/systemd/system/dbus.service
	ln -sf /lib/systemd/system/dbus.socket $rootfs_dir/etc/systemd/system/dbus.socket
}

build_rootfs() {
	local rootfs_dir=$1
	local multistrap_conf=multistrap.conf

	# For simplicity's sake, use multistrap for foreign and native bootstraps.
	cat > "$multistrap_conf" << EOF
[General]
cleanup=true
aptsources=Ubuntu
bootstrap=Ubuntu

[Ubuntu]
source=$REPO_URL
keyring=ubuntu-keyring
suite=focal
packages=$PACKAGES $EXTRA_PKGS
EOF
	if ! multistrap -a "$DEB_ARCH" -d "$rootfs_dir" -f "$multistrap_conf"; then
		build_dbus $rootfs_dir
	fi
	rm -rf "$rootfs_dir/var/run"
	ln -s /run "$rootfs_dir/var/run"
	cp --remove-destination /etc/resolv.conf "$rootfs_dir/etc"

	# Reduce image size and memory footprint by removing unnecessary files and directories.
	rm -rf $rootfs_dir/usr/share/{bash-completion,bug,doc,info,lintian,locale,man,menu,misc,pixmaps,terminfo,zsh}

	# Minimal set of device nodes needed when AGENT_INIT=yes so that the
	# kernel can properly setup stdout/stdin/stderr for us
	pushd $rootfs_dir/dev
	MAKEDEV -v console tty ttyS null zero fd
	popd
}