xbps-src: read specified config file in doinst-helper, if set.

xbps-src/libexec/doinst-helper.sh.in

@@ -26,7 +26,11 @@
 
 PKG_TMPLNAME="$1"
 
-. @@XBPS_INSTALL_ETCDIR@@/xbps-src.conf
+if [ -n "${CONFIG_FILE}" -a -r "${CONFIG_FILE}" ]; then
+	. ${CONFIG_FILE}
+else
+	. @@XBPS_INSTALL_ETCDIR@@/xbps-src.conf
+fi
 
 if [ -n "${MASTERDIR}" ]; then
 	export XBPS_MASTERDIR="${MASTERDIR}"

xbps-src/shutils/pkgtarget_funcs.sh.in

@@ -90,6 +90,7 @@ install_pkg()
 	env xbps_machine=${xbps_machine} MASTERDIR=${_MASTERDIR}	\
 		wrksrc=${wrksrc}					\
 		BOOTSTRAP_PKG_REBUILD=$BOOTSTRAP_PKG_REBUILD		\
+		CONFIG_FILE=${XBPS_CONFIG_FILE}				\
 		${fakeroot_cmd} ${fakeroot_cmd_args}			\
 		@@XBPS_INSTALL_LIBEXECDIR@@/doinst-helper		\
 		${curpkgn} || return $?