eclass for installing stuff from GOG

eclass/gog.eclass

@@ -0,0 +1,79 @@
+# Copyright 2020-2020 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+
+# @ECLASS: gog.eclass
+# @MAINTAINER:
+# moog621@gmail.com
+# @AUTHOR:
+# moog621@gmail.com
+# @SUPPORTED_EAPIS: 7
+# @BLURB: Functions for interacting with GOG API.
+# @DESCRIPTION:
+# Sets GOG_GAME_* variables for use with games that can be obtained from GOG.
+# Additionally, some games are not available on all platforms. ebuilds are
+# allowed to prefer a platform that works best with the host platform.
+# However, GOG probably supplies only x86 binaries for Linux, Mac and Windows.
+# It is up to the ebuild to enable and offer other alternate avenues to support
+# a particular game.
+
+# @ECLASS-VARIABLE: GOG_GAME_NAME
+# @DESCRIPTION:
+# Name of the game as it appears in lgogdownloader list.
+: ${GOG_GAME_NAME:=}
+
+# @ECLASS-VARIABLE: GOG_GAME_L10N
+# @DESCRIPTION:
+# Languages available for the game.
+: ${GOG_GAME_L10N:=()}
+
+# @ECLASS-VARIABLE: GOG_GAME_PLATFORM
+# @DESCRIPTION:
+# This choice specifies which binaries, for which platform, will be downloaded from GOG.
+# Sometimes, this can be irrelevant, as unofficial platform binaries may come from 3rd
+# party sources.
+: ${GOG_GAME_PLATFORM:=}
+
+# @ECLASS-VARIABLE: GOG_GAME_INSTALLER
+# @DESCRIPTION:
+# Filename of the installer. There can be many, as some games support each language
+# through separate installers.
+: ${GOG_GAME_INSTALLER:=()}
+
+RESTRICT="network-sandbox"
+LICENSE="GOG_EULA"
+BDEPEND+="
+	games-util/lgogdownloader[portage]
+	app-arch/innoextract"
+
+gog_sanity_check() {
+	if [ $(echo ${FEATURES} | tr ' ' '\n' | grep -c network\-sandbox) -ne 0 ]; then
+		die "This ebuild requires network-sandbox to be removed from FEATURES."
+	fi
+	portageq envvar GOG_CONFIG >/dev/null 2>/dev/null
+	if [ $? -ne 0 ]; then
+		die "Please define GOG_CONFIG in /etc/portage/make.conf as the output of export_gog_to_portage."
+	fi
+}
+
+gog_initialize() {
+	gog_sanity_check
+	mkdir -p ~/.config
+	echo ${GOG_CONFIG} | base64 -d | tar -Jxf - -C ~
+}
+
+# @FUNCTION: gog_download_installer
+# @DESCRIPTION:
+# Downloads the offline installer of a specified game, with specified language, for the specified platform.
+gog_download_installer() {
+	lgogdownloader --no-platform-detection --download --game ${GOG_GAME_NAME} --exclude extras --language ${GOG_GAME_L10N} --platform ${GOG_GAME_PLATFORM} >/dev/null 2>/dev/null
+	if [ $? -ne 0 ]; then
+		die "lgogdownloader failed. Please make sure it works."
+	fi
+}
+
+# @FUNCTION: gog_extract_installer
+# @DESCRIPTION:
+# Extracts the installer of specified filename.
+gog_extract_installer() {
+	innoextract -e ${GOG_GAME_INSTALLER}
+}