CMake: Do not search parent directories for Git metadata

Author: Growl1234

CMakeLists.txt

@@ -41,7 +41,7 @@ if (GIT_DESC)
 
   execute_process(
     COMMAND git log -1 --format=%ai
-    WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+    WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
     OUTPUT_VARIABLE GIT_COMMIT_DATE
     OUTPUT_STRIP_TRAILING_WHITESPACE)
 

cmake/GetGitRevisionDescription.cmake

@@ -46,22 +46,15 @@ set(__get_git_revision_description YES)
 get_filename_component(_gitdescmoddir ${CMAKE_CURRENT_LIST_FILE} PATH)
 
 function(get_git_head_revision _refspecvar _hashvar)
-	set(GIT_PARENT_DIR "${CMAKE_CURRENT_SOURCE_DIR}")
-	set(GIT_DIR "${GIT_PARENT_DIR}/.git")
-	while(NOT EXISTS "${GIT_DIR}")	# .git dir not found, search parent directories
-		set(GIT_PREVIOUS_PARENT "${GIT_PARENT_DIR}")
-		get_filename_component(GIT_PARENT_DIR ${GIT_PARENT_DIR} PATH)
-		if(GIT_PARENT_DIR STREQUAL GIT_PREVIOUS_PARENT)
-			# We have reached the root directory, we are not in git
-			set(${_refspecvar} "GITDIR-NOTFOUND" PARENT_SCOPE)
-			set(${_hashvar} "GITDIR-NOTFOUND" PARENT_SCOPE)
-			return()
-		endif()
-		set(GIT_DIR "${GIT_PARENT_DIR}/.git")
-	endwhile()
+	set(GIT_DIR "${CMAKE_CURRENT_SOURCE_DIR}/.git")
+	if(NOT EXISTS "${GIT_DIR}")
+		set(${_refspecvar} "GITDIR-NOTFOUND" PARENT_SCOPE)
+		set(${_hashvar} "GITDIR-NOTFOUND" PARENT_SCOPE)
+		return()
+	endif()
 	# check if this is a submodule
-	if(NOT IS_DIRECTORY ${GIT_DIR})
-		file(READ ${GIT_DIR} submodule)
+	if(NOT IS_DIRECTORY "${GIT_DIR}")
+		file(READ "${GIT_DIR}" submodule)
 		string(REGEX REPLACE "gitdir: (.*)\n$" "\\1" GIT_DIR_RELATIVE ${submodule})
 		get_filename_component(SUBMODULE_DIR ${GIT_DIR} PATH)
 		get_filename_component(GIT_DIR ${SUBMODULE_DIR}/${GIT_DIR_RELATIVE} ABSOLUTE)