#!/bin/bash
#tool/distro specific functions for fetching, building and installing dependencies

fetch_source () {
	# systemd
	download_untar "$REQUIRED_URL" "src/"

	# starting with systemd 212 a new way of setting global environment is supported
	# meaning we don't have to apply the patch needed til that version.
	# patch src/core/socket.c if activated in the config file
	if [ "x$REQUIRED_XATTR_PATCH" = "xyes" ]; then
		pinfo "Patching 'src/core/socket.c' ..."
		# patch it
		if [ -e "src/$REQUIRED_VERSION/src/core/socket.c" ]; then
			sed -i 's/^#include <attr\/xattr.h>$/#include <sys\/xattr.h>\n#include <attr\/xattr.h>/g' "src/$REQUIRED_VERSION/src/core/socket.c" \
				|| perror "Could not patch 'src/$REQUIRED_VERSION/src/core/socket.c'"
		else
			perror "'src/$REQUIRED_VERSION/src/core/socket.c' does not exist."
		fi
	fi
	# now check if the old fix needs to be applied
	# NOTE: only for systemd-204
	if [ "x${REQUIRED_VERSION#systemd-}" = "x204" ]; then
		# Patch PATH, HOME, USER environment
		# TODO: Newer systemd versions support DefaultEnvironment=xxx in /etc/systemd/system.conf
		# However, there were lots of changes after systemd 204, so we didn't update yet
		# See http://cgit.freedesktop.org/systemd/systemd/tree/NEWS for changes.
		patch -p0 src/systemd-*/src/core/main.c < ${MODULE_DIR}/systemd-openslx.patch || perror "Failed to apply openslx systemd patch."
		# fix mtd_probe.h missing an include for stdint.h, those types probably used to
		# be defined elsewhere and that was change with newer libc versions
		patch -p0 src/systemd-*/src/udev/mtd_probe/mtd_probe.h < ${MODULE_DIR}/systemd-204-mtd_probe.patch || perror "Failed to apply mtd_probe.h patch."
		# systemd-204 requires gperf 3.0.4 for generating internal code,
		# starting with ubuntu 17.10, gperf is only available in version 3.1.1.
		# launchpad has the correct version: https://launchpad.net/ubuntu/artful/amd64/gperf/3.0.4-2
		if which gperf &> /dev/null; then
			LOCAL_GPERF_VER="$(gperf --version | head -1 | awk '{print $3}')"
			if [ "x${LOCAL_GPERF_VER}" != "x3.0.4" ]; then
				# bad version, no force removal
				perror "gperf version '3.0.4' expected but '${LOCAL_GPERF_VER}' is installed. Please remove it and try again."
			fi
		else
			# no gperf installed, install it from launchpad
			REQUIRED_GPERF_URL="http://launchpadlibrarian.net/214035609/gperf_3.0.4-2_amd64.deb"
			pinfo "Downloading gperf from '${REQUIRED_GPERF_URL}'..."
			if ! wget -P "${MODULE_WORK_DIR}" "${REQUIRED_GPERF_URL}"; then
				perror "Failed to download '${REQUIRED_GPERF_URL}'."
			fi
			pinfo "Installing gperf from '${MODULE_WORK_DIR}/${REQUIRED_GPERF_URL##*/}'..."
			if ! dpkg -i "${MODULE_WORK_DIR}/${REQUIRED_GPERF_URL##*/}"; then
				perror "Failed to install '${MODULE_WORK_DIR}/${REQUIRED_GPERF_URL##*/}'."
			fi
		fi

	elif  [ "x${REQUIRED_VERSION#systemd-}" = "x229" ]; then
		patch -p0 src/systemd-*/src/basic/path-util.h < ${MODULE_DIR}/systemd-openslx-229.patch || perror "Failed to apply openslx systemd patch."
	else
		# TODO use the above hint for setting environmenet through /etc/systemd/system.conf
		pinfo "Missing..."
	fi

	# libkmod
	download_untar "$REQUIRED_LIBKMOD_URL" "src/"
}

build () {
	#build libkmod
	pinfo "Building libkmod"
	cd "${MODULE_WORK_DIR}/src/$REQUIRED_LIBKMOD_VERSION"
	./configure || perror "./configure kmod failed."
	make || perror "kmod make failed."
	DESTDIR="${MODULE_BUILD_DIR}" make install || perror "kmod make install failed."
	cd - &> /dev/null

	#build systemd
	pinfo "Building systemd"
	cd "${MODULE_WORK_DIR}/src/$REQUIRED_VERSION"
	pinfo "calling configure in ${MODULE_WORK_DIR}/src/$REQUIRED_VERSION"

	# Save potentially pre-used paths/flages
	OLDLDFLAGS="$LDFLAGS"
	OLDCPPFLAGS="$CPPFLAGS"
	OLDPKG_CONFIG_PATH="$PKG_CONFIG_PATH"
	OLDLD_LIBRARY_PATH="$LD_LIBRARY_PATH"

	export LDFLAGS="$LDFLAGS -L${MODULE_BUILD_DIR}/usr/lib"
	export CPPFLAGS="-I${MODULE_BUILD_DIR}/usr/include"
	export PKG_CONFIG_PATH="${MODULE_BUILD_DIR}/usr/lib64/pkgconfig:${MODULE_BUILD_DIR}/usr/lib/pkgconfig"
	export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:${MODULE_BUILD_DIR}/usr/lib:${MODULE_BUILD_DIR}/usr/lib64"

	[ ! -e "./configure" ] && ./autogen.sh

	./configure \
		--disable-manpages \
		--enable-split-usr \
		--sysconfdir="/etc" \
		--enable-gtk-doc-html=no \
		--disable-nls \
		--disable-microhttpd \
		--disable-bootchart \
		--disable-quotacheck \
		--disable-hostnamed \
		--disable-timedated \
		--disable-localed \
		--disable-coredump \
		--disable-keymap \
		--without-python \
		--enable-blkid \
		--enable-acl \
		--enable-pam \
		--enable-kmod \
		--with-pamlibdir="$SYS_PAM_MODULES_PATH" \
			|| perror "configure failed."

	pinfo "calling make"
	make || perror "make failed."
	pinfo "calling make install"
	DESTDIR="${MODULE_BUILD_DIR}" make install || perror "make install failed."
	cd - &> /dev/null

	# Restore used flags/paths:
	export LDFLAGS="$OLDLDFLAGS"
	export CPPFLAGS="$OLDCPPFLAGS"
	export PKG_CONFIG_PATH="$OLDPKG_CONFIG_PATH"
	export LD_LIBRARY_PATH="$OLDLD_LIBRARY_PATH"
}

post_copy() {
	:
}