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#!/bin/bash

# Copyright (C) 2016 Paul Kocialkowski <contact@paulk.fr>
#
# 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, either version 3 of the License, or
# (at your option) any later version.
#
# 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.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

libreboot_usage() {
	local action
	local target

	printf "$executable [action] [target] [arguments]\n" >&2

	printf "\nGeneric project actions:\n" >&2

	for action in $PROJECT_ACTIONS_GENERIC
	do
		printf "  $action\n" >&2
	done

	printf "\nVirtual project actions:\n" >&2

	printf "  sources\n"
	printf "  produce\n"
	printf "  test\n"

	printf "\nProject targets:\n" >&2

	ls -A "$root/$PROJECTS/" | while read target
	do
		if project_check "$target"
		then
			printf "  $target\n" >&2
		fi
	done

	printf "\nGeneric tool actions:\n" >&2

	for action in $TOOL_ACTIONS_GENERIC
	do
		printf "  $action\n" >&2
	done

	printf "\nTool targets:\n" >&2

	ls -A "$root/$TOOLS/" | while read target
	do
		if tool_check "$target"
		then
			printf "  $target\n" >&2
		fi
	done

	printf "\nEnvironment variables:\n" >&2
	printf "  PROJECTS_FORCE - Projects to always perform actions for\n" >&2
	printf "  TOOLS_FORCE - Tools to always perform actions for\n" >&2
	printf "  RELEASE_KEY - GPG key to use for release\n" >&2
	printf "  VBOOT_KEYS_PATH - Path to the vboot keys\n" >&2
	printf "  TASKS - Number of simultaneous tasks to run\n" >&2
	printf "  VERSION - Version string to use\n" >&2

	printf "\nConfiguration files:\n" >&2
	printf "  $BUILD_SYSTEM.conf - Environment variables configuration\n" >&2
}

libreboot_project() {
	action=$1
	shift
	project=$1
	shift

	case $action in
		"sources")
			(
				set +e

				project_action_arguments "extract" "$project" "$@"
				if [ $? -eq 0 ]
				then
					return 0
				fi

				project_action_arguments "download" "$project" "$@"
				if [ $? -eq 0 ]
				then
					return 0
				fi
			)
			;;
		"produce")
			for action in "build" "install" "release"
			do
				project_action_arguments "$action" "$project" "$@"
			done
			;;
		"test")
			for action in $PROJECT_ACTIONS
			do
				project_action_arguments "$action" "$project" "$@"
			done
			;;
		*)
			if ! project_function_check "$project" "$action"
			then
				libreboot_usage
				exit 1
			fi

			if [ "$action" = "usage" ]
			then
				project_action "$action" "$project" "$@"
			else
				project_action_arguments "$action" "$project" "$@"
			fi
			;;
	esac
}

libreboot_tool() {
	action=$1
	shift
	tool=$1
	shift

	case $action in
		*)
			if ! tool_function_check "$tool" "$action"
			then
				libreboot_usage
				exit 1
			fi

			if [ "$action" = "usage" ]
			then
				tool_action "$action" "$tool" "$@"
			else
				tool_action_arguments_recursive "$action" "$tool" "$@"
			fi
			;;
	esac
}

libreboot_setup() {
	root=$( realpath "$( dirname "$0" )" )
	executable=$( basename "$0" )

	local requirements="git"
	local requirement_path

	libreboot_setup_include
	libreboot_setup_variables

	for requirement in $requirements
	do
		requirement_path=$( which "$requirement" || true )

		if [ -z "$requirement_path" ]
		then
			printf "Missing requirement: $requirement\n" >&2
			exit 1
		fi
	done
}

libreboot_setup_include() {
	local libs_path="$root/libs"
	local conf_path

	. "$libs_path/project"
	. "$libs_path/tool"
	. "$libs_path/common"
	. "$libs_path/git"

	conf_path="$root/$BUILD_SYSTEM.conf"

	if [ -f "$conf_path" ]
	then
		. "$conf_path"
	fi
}

libreboot_setup_variables() {
	local vboot_tools_path=$( project_install_path "vboot" "tools" )
	local version_path="$root/$DOTVERSION"
	local epoch_path="$root/$DOTEPOCH"

	if [ -z "$TASKS" ]
	then
		TASKS=1
	fi

	if [ -z "$VERSION" ]
	then
		if git_check "$root"
		then
			VERSION="$BUILD_SYSTEM-"$( git_describe "$root" 2> /dev/null || echo "git" )
		elif [ -f "$version_path" ]
		then
			VERSION=$( cat "$version_path" )
		else
			VERSION=$BUILD_SYSTEM
		fi
	fi

	if [ -z "$SOURCE_DATE_EPOCH" ]
	then
		if git_check "$root"
		then
			SOURCE_DATE_EPOCH=$( git log -1 --format=%ct )
		elif [ -f "$epoch_path" ]
		then
			SOURCE_DATE_EPOCH=$( cat "$epoch_path" )
		else
			SOURCE_DATE_EPOCH=$( date +%s )
		fi
	fi

	if [ -z "$VBOOT_KEYS_PATH" ] && [ -d "$vboot_tools_path/devkeys/" ]
	then
		VBOOT_KEYS_PATH="$vboot_tools_path/devkeys/"
	fi

	if [ -z "$EDITOR" ]
	then
		EDITOR="vi"
	fi
}

libreboot() {
	action=$1
	shift
	target=$1
	shift

	set -e

	libreboot_setup "$@"

	if [ -z "$action" ] || [ -z "$target" ]
	then
		libreboot_usage
		exit 1
	fi

	requirements "tar" "sed" "gpg" "sha256sum"

	if project_check "$target"
	then
		libreboot_project "$action" "$target" "$@"
	elif tool_check "$target"
	then
		libreboot_tool "$action" "$target" "$@"
	else
		libreboot_usage
		exit 1
	fi
}

libreboot "$@"