# "shell" command
#
# Copyright (C) 2014, 2015  Patrick 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/>.

cmd_shell_main()
{
	local root=
	local dev=
	local es=

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

	root="${1}"
	shift 1

	dev=''
	if is_block "${root}"; then
		dev="${root}"
		if ! root="$(block_mount "${dev}")"; then
			return 2
		fi
	fi

	if ! profile_detect "${root}"; then
		[ "x${dev}" != 'x' ] && block_umount "${root}"
		return 2
	fi

	if ! session_begin "${root}" . false; then
		[ "x${dev}" != 'x' ] && block_umount "${root}"
		return 2
	fi
	es=0
	if [ ${#} -eq 0 ]; then
		session_exec /bin/sh || es=${?}
		printf '\n'
		info "$(get_msg 'cmd_shell_exiting')"
	else
		session_exec "${@}" || es=${?}
	fi
	session_end

	[ "x${dev}" != 'x' ] && block_umount "${root}"

	return ${es}
}

cmd_shell_register()
{
	register_cmd 'shell'
}
__init cmd_shell_register