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# "install" command
#
# Copyright (C) 2013, 2014  Patrick "P. J." McDermott
#
# This file is part of the ProteanOS Development Kit.
#
# The ProteanOS Development Kit 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, either version 3 of the
# License, or (at your option) any later version.
#
# The ProteanOS Development Kit 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.
#
# You should have received a copy of the GNU General Public License
# along with the ProteanOS Development Kit.  If not, see
# <http://www.gnu.org/licenses/>.

use getopt
use feed
use profile
use dir
use fd
use pkg

cmd_install_optstring='a:p:m:F'
cmd_install_deps=
cmd_install_fnames=
cmd_install_md5sums=
cmd_install_sha256sums=
cmd_install_feed_url=

cmd_install_main()
{
	local suite=
	local chroot=
	local arch=
	local plat=
	local profile=
	local mirror=
	local foreign=

	if ! get_options "${@}"; then
		print_cmd_usage 'install' >&2
		exit 1
	fi
	shift $(($OPTIND - 1))

	if [ ${#} -lt 2 ]; then
		print_cmd_usage 'install' >&2
		exit 1
	fi

	# TODO: Consider making suite optional, getting a default suite from the
	# profile.
	suite="${1}"
	chroot="${2}"

	if [ "x${suite%%:*}" != "x${suite}" ]; then
		profile="${suite%%:*}"
		suite="${suite#*:}"
	else
		profile='proteanos'
	fi
	profile_set "${profile}"
	suite="$(profile_normalize_suite "${suite}")"

	if [ "x${cmd_install_opt_a+set}" = 'xset' ]; then
		arch="${cmd_install_opt_a}"
	else
		arch="$(profile_detect_arch)"
	fi
	if [ "x${cmd_install_opt_p+set}" = 'xset' ]; then
		plat="${cmd_install_opt_p}"
	else
		plat="$(profile_default_plat)"
	fi
	if ! profile_validate_archplat "${arch}" "${plat}"; then
		error 2 "$(get_msg 'cmd_install_bad_archplat')" \
			"${arch}" "${plat}"
	fi
	info "$(get_msg 'cmd_install_selected_arch')" "${arch}"
	info "$(get_msg 'cmd_install_selected_plat')" "${plat}"

	if [ "x${cmd_install_opt_m+set}" = 'xset' ]; then
		mirror="${cmd_install_opt_m}"
	else
		mirror="$(profile_select_mirror)"
	fi
	info "$(get_msg 'cmd_install_selected_mirror')" "${mirror}"

	if [ "x${cmd_install_opt_F+set}" = 'xset' ]; then
		foreign=true
	else
		foreign=false
	fi

	info "$(get_msg 'cmd_install_setting_up_chroot')"
	if [ -d "${chroot}" ] && ! dir_is_empty "${chroot}" 'lost+found'; then
		error 2 "$(get_msg 'cmd_install_chroot_dir_exists')" "${chroot}"
	fi
	if ! mkdir -p "${chroot}/.prokit" "${chroot}/prokit"; then
		error 2 "$(get_msg 'cmd_install_mkdir_chroot_fail')" "${chroot}"
	fi
	>"${chroot}/prokit/installing"

	info "$(get_msg 'cmd_install_find_pkgs')"
	cmd_install_find_pkgs "${mirror}" "${suite}" "${arch}" "${plat}" \
		"${chroot}"
	cmd_install_get_pkgs "${chroot}"

	info "$(get_msg 'cmd_install_configuring')"
	if ! ${foreign}; then
		profile_configure_system_native "${chroot}"
	else
		profile_configure_system_foreign "${chroot}"
	fi

	rm "${chroot}/prokit/installing"
}

cmd_install_find_pkgs()
{
	local mirror="${1}"
	local suite="${2}"
	local arch="${3}"
	local plat="${4}"
	local chroot="${5}"
	local opkg_conf_fd=
	local pkgs_fd=
	local opt=
	local feed_idx=
	local feed=
	local gzip=
	local pkgs=

	mkdir -p "${chroot}/etc/opkg" "${chroot}/var/lib/opkg/lists"
	fopen "${chroot}/etc/opkg/opkg.conf" 'w'
	opkg_conf_fd=${FD}

	cmd_install_deps=
	cmd_install_fnames=
	cmd_install_md5sums=
	cmd_install_sha256sums=

	fopen "${chroot}/.prokit/packages" 'w'
	pkgs_fd=${FD}

	while read -r opt feed_idx feed; do
		case "${opt}" in
			'src') gzip=false;;
			'src/gz') gzip=true;;
			*) continue;;
		esac
		printf '%s %s %s\n' "${opt}" "${feed_idx}" "${feed%/Packages}" \
			>&${opkg_conf_fd}
		feed_download "${feed}" ${gzip} \
			>"${chroot}/var/lib/opkg/lists/${feed_idx}"
		cmd_install_feed_url="${feed%/*}"
		feed_find_pkgs "${chroot}/var/lib/opkg/lists/${feed_idx}" \
			"$(profile_dep_fields)" profile_include_pkg \
			cmd_install_deps_cb cmd_install_fname_cb \
			cmd_install_md5sum_cb cmd_install_sha256sum_cb \
			>&${pkgs_fd}
	done <<-EOF
		$(profile_feeds "${mirror}" "${arch}" "${plat}" "${suite}")
		EOF

	printf '\ndest root /\n' >&${opkg_conf_fd}
	printf 'arch %s 1\n' 'all' "${arch}" 'src' >&${opkg_conf_fd}
	fclose ${opkg_conf_fd}
	fclose ${pkgs_fd}

	pkgs="$(resolve_deps "$(cat "${chroot}/.prokit/packages")" \
		"${cmd_install_deps}" | xargs printf '%s\n' | sort -u)"
	printf '%s\n' "${pkgs}" >"${chroot}/.prokit/packages"
}

cmd_install_deps_cb()
{
	local pkg="${1}"
	local deps="${2}"

	cmd_install_deps="${cmd_install_deps}${pkg}: ${deps}${LF}"
}

cmd_install_fname_cb()
{
	local pkg="${1}"
	local fname="${2}"

	cmd_install_fnames="$(printf '%s\n%s %s/%s' "${cmd_install_fnames}" \
		"${pkg}" "${cmd_install_feed_url}" "${fname}")"
}

cmd_install_md5sum_cb()
{
	local pkg="${1}"
	local md5sum="${2}"

	cmd_install_md5sums="$(printf '%s\n%s %s' "${cmd_install_md5sums}" \
		"${pkg}" "${md5sum}")"
}

cmd_install_sha256sum_cb()
{
	local pkg="${1}"
	local sha256sum="${2}"

	cmd_install_sha256sums="$(printf '%s\n%s %s' \
		"${cmd_install_sha256sums}" "${pkg}" "${sha256sum}")"
}

cmd_install_get_pkgs()
{
	local chroot="${1}"
	local status_fd=
	local pkg=
	local fname=
	local md5sum=
	local sha256sum=
	local file=
	local control=
	local field=
	local printed=

	mkdir -p "${chroot}/var/cache/opkg/archives" "${chroot}/tmp/opkg" \
		"${chroot}/var/lib/opkg/info"

	fopen "${chroot}/var/lib/opkg/status" 'w'
	status_fd=${FD}

	for pkg in $(cat "${chroot}/.prokit/packages"); do
		info "$(get_msg 'cmd_install_downloading_pkg')" "${pkg}"
		fname="$(printf '%s\n' "${cmd_install_fnames}" | \
			sed -n "s/^${pkg} //p")"
		md5sum="$(printf '%s\n' "${cmd_install_md5sums}" | \
			sed -n "s/^${pkg} //p")"
		sha256sum="$(printf '%s\n' "${cmd_install_sha256sums}" | \
			sed -n "s/^${pkg} //p")"
		wget -q -O "${chroot}/var/cache/opkg/archives/${fname##*/}" \
			"${fname}" || \
			error 2 "$(get_msg 'cmd_install_downloading_pkg_fail')"
		fname="var/cache/opkg/archives/${fname##*/}"
		if [ "x${md5sum}" != 'x' ]; then
			printf '%s  %s\n' \
				"${md5sum}" "${chroot}/${fname}" | \
				md5sum -c >/dev/null 2>&1 || \
				error 2 "$(get_msg 'cmd_install_checksum_fail')"
		fi
		if [ "x${sha256sum}" != 'x' ]; then
			printf '%s  %s\n' \
				"${sha256sum}" "${chroot}/${fname}" | \
				sha256sum -c >/dev/null 2>&1 || \
				error 2 "$(get_msg 'cmd_install_checksum_fail')"
		fi

		info "$(get_msg 'cmd_install_unpacking_pkg')" "${pkg}"
		mkdir "${chroot}/tmp/opkg/${pkg}"
		(
			cd "${chroot}"
			tar -xzOf "${fname}" data.tar.gz \
				>"tmp/opkg/${pkg}/data.tar.gz"
			tar -xzf "tmp/opkg/${pkg}/data.tar.gz"
			cd "tmp/opkg/${pkg}"
			tar -xzOf "../../../${fname}" control.tar.gz | \
				tar -xz
		)
		tar -tzf "${chroot}/tmp/opkg/${pkg}/data.tar.gz" | \
			sed 's/^\.//' >"${chroot}/var/lib/opkg/info/${pkg}.list"
		rm -f "${chroot}/tmp/opkg/${pkg}/data.tar.gz"
		for file in "${chroot}/tmp/opkg/${pkg}/"*; do
			mv "${file}" \
				"${chroot}/var/lib/opkg/info/${pkg}.${file##*/}"
		done
		rmdir "${chroot}/tmp/opkg/${pkg}"

		# Write status file.
		control="${chroot}/var/lib/opkg/info/${pkg}.control"
		for field in Package Version Depends Recommends Suggests \
				Provides Replaces Conflicts; do
			grep "^${field}: " "${control}" >&${status_fd}
		done
		printf 'Status: install ok unpacked\n' >&${status_fd}
		for field in Essential Architecture; do
			grep "^${field}: " "${control}" >&${status_fd}
		done
		if [ -r "${chroot}/var/lib/opkg/info/${pkg}.conffiles" ]; then
			printed=false
			while read -r file; do
				${printed} || printf 'Conffiles:\n' \
					>&${status_fd}
				printf ' %s %s\n' "${file}" "$(md5sum \
					"${chroot}/${file}" | cut -d' ' -f1)" \
					>&${status_fd}
				printed=true
			done <"${chroot}/var/lib/opkg/info/${pkg}.conffiles"
		fi
		printf 'Installed-Time: %s\n\n' "$(date '+%s')" >&${status_fd}

		rm -f "${chroot}/${fname}"
	done

	rm "${chroot}/.prokit/packages"
	rmdir "${chroot}/.prokit"

	fclose ${status_fd}
}