#!/bin/bash
# License: GNU GPLv2
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

m4_include(lib/common.sh)
m4_include(lib/archroot.sh)

# umask might have been changed in /etc/profile
# ensure that sane default is set again
umask 0022

working_dir=''
umode=''

files=()
nspawn_args=()

usage() {
	echo "Usage: ${0##*/} [options] working-dir package-list..."
	echo ' options:'
	echo '    -U            Use pacman -U to install packages'
	echo '    -C <file>     Location of a pacman config file'
	echo '    -M <file>     Location of a makepkg config file'
	echo '    -c <dir>      Set pacman cache'
	echo '    -f <file>     Copy file from the host to the chroot'
	echo '    -s            Do not run setarch'
	echo '    -h            This message'
	exit 1
}

while getopts 'hUC:M:c:f:s' arg; do
	case "$arg" in
		U) umode=U ;;
		C) pac_conf="$OPTARG" ;;
		M) makepkg_conf="$OPTARG" ;;
		c) cache_dirs+=("$OPTARG") ;;
		f) files+=("$OPTARG") ;;
		s) nosetarch=1 ;;
		h|?) usage ;;
		*) error "invalid argument '%s'" "$arg"; usage ;;
	esac
	if [[ $arg != U ]]; then
		nspawn_args+=("-$arg")
		[[ -v OPTARG ]] && nspawn_args+=("$OPTARG")
	fi
done
shift $((OPTIND - 1))

(( $# < 2 )) && die 'You must specify a directory and one or more packages.'

check_root

working_dir="$(readlink -f "$1")"
shift 1

[[ -z $working_dir ]] && die 'Please specify a working directory.'

pacconf_cmd=$(command -v pacman-conf || command -v pacconf)

if (( ${#cache_dirs[@]} == 0 )); then
	mapfile -t cache_dirs < <($pacconf_cmd CacheDir)
fi

umask 0022

[[ -e $working_dir ]] && die "Working directory '%s' already exists" "$working_dir"

mkdir -p "$working_dir"

lock 9 "${working_dir}.lock" "Locking chroot"

if is_btrfs "$working_dir"; then
	rmdir "$working_dir"
	if ! btrfs subvolume create "$working_dir"; then
		die "Couldn't create subvolume for '%s'" "$working_dir"
	fi
	chmod 0755 "$working_dir"
fi

for file in "${files[@]}"; do
	mkdir -p "$(dirname "$working_dir$file")"
	cp "$file" "$working_dir$file"
done

pacstrap -${umode}Mcd ${pac_conf:+-C "$pac_conf"} "$working_dir" \
	"${cache_dirs[@]/#/--cachedir=}" "$@" || die 'Failed to install all packages'

printf '%s.UTF-8 UTF-8\n' en_US de_DE > "$working_dir/etc/locale.gen"
cat '/etc/hosts' > "$working_dir/etc/hosts"
echo 'LANG=en_US.UTF-8' > "$working_dir/etc/locale.conf"
echo "$CHROOT_VERSION" > "$working_dir/.arch-chroot"

systemd-machine-id-setup --root="$working_dir"

pacman-key --gpgdir "$working_dir"/etc/pacman.d/gnupg --init

exec arch-nspawn \
	"${nspawn_args[@]}" \
	"$working_dir" locale-gen