updated git version retrieval cmake plugin

resources/cmake/macros/GetGitRevisionDescription.cmake

@@ -18,6 +18,12 @@
 # and adjusting the output so that it tests false if there was no exact
 # matching tag.
 #
+#  git_local_changes(<var>)
+#
+# Returns either "CLEAN" or "DIRTY" with respect to uncommitted changes.
+# Uses the return code of "git diff-index --quiet HEAD --".
+# Does not regard untracked files.
+#
 # Requires CMake 2.6 or newer (uses the 'function' command)
 #
 # Original Author:
@@ -37,10 +43,10 @@ set(__get_git_revision_description YES)
 
 # We must run the following at "include" time, not at function call time,
 # to find the path to this module rather than the path to a calling list file
-get_filename_component(_gitdescmoddir GetGitRevisionDescription.cmake PATH)
+get_filename_component(_gitdescmoddir ${CMAKE_CURRENT_LIST_FILE} PATH)
 
 function(get_git_head_revision _refspecvar _hashvar)
-	set(GIT_PARENT_DIR ${PROJECT_SOURCE_DIR})
+	set(GIT_PARENT_DIR "${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 "${GIT_PARENT_DIR}")
@@ -71,7 +77,7 @@ function(get_git_head_revision _refspecvar _hashvar)
 	set(HEAD_FILE "${GIT_DATA}/HEAD")
 	configure_file("${GIT_DIR}/HEAD" "${HEAD_FILE}" COPYONLY)
 
-	configure_file("${PROJECT_SOURCE_DIR}/resources/cmake/macros/GetGitRevisionDescription.cmake.in"
+	configure_file("${_gitdescmoddir}/GetGitRevisionDescription.cmake.in"
 		"${GIT_DATA}/grabRef.cmake"
 		@ONLY)
 	include("${GIT_DATA}/grabRef.cmake")
@@ -110,7 +116,7 @@ function(git_describe _var)
 		${hash}
 		${ARGN}
 		WORKING_DIRECTORY
-		"${CMAKE_SOURCE_DIR}"
+		"${CMAKE_CURRENT_SOURCE_DIR}"
 		RESULT_VARIABLE
 		res
 		OUTPUT_VARIABLE
@@ -124,7 +130,12 @@ function(git_describe _var)
 	set(${_var} "${out}" PARENT_SCOPE)
 endfunction()
 
-function(git_describe_checkout _var)
+function(git_get_exact_tag _var)
+	git_describe(out --exact-match ${ARGN})
+	set(${_var} "${out}" PARENT_SCOPE)
+endfunction()
+
+function(git_local_changes _var)
 	if(NOT GIT_FOUND)
 		find_package(Git QUIET)
 	endif()
@@ -138,39 +149,20 @@ function(git_describe_checkout _var)
 		return()
 	endif()
 
-	# TODO sanitize
-	#if((${ARGN}" MATCHES "&&") OR
-	#	(ARGN MATCHES "||") OR
-	#	(ARGN MATCHES "\\;"))
-	#	message("Please report the following error to the project!")
-	#	message(FATAL_ERROR "Looks like someone's doing something nefarious with git_describe! Passed arguments ${ARGN}")
-	#endif()
-
-	#message(STATUS "Arguments to execute_process: ${ARGN}")
-
 	execute_process(COMMAND
 		"${GIT_EXECUTABLE}"
-		describe
-		--tags
-		--dirty=-dirty
-		--long
-		${ARGN}
+		diff-index --quiet HEAD --
 		WORKING_DIRECTORY
-		"${CMAKE_SOURCE_DIR}"
+		"${CMAKE_CURRENT_SOURCE_DIR}"
 		RESULT_VARIABLE
 		res
 		OUTPUT_VARIABLE
 		out
 		ERROR_QUIET
 		OUTPUT_STRIP_TRAILING_WHITESPACE)
-	if(NOT res EQUAL 0)
-		set(out "${out}-${res}-NOTFOUND")
+	if(res EQUAL 0)
+		set(${_var} "CLEAN" PARENT_SCOPE)
+	else()
+		set(${_var} "DIRTY" PARENT_SCOPE)
 	endif()
-
-	set(${_var} "${out}" PARENT_SCOPE)
-endfunction()
-
-function(git_get_exact_tag _var)
-	git_describe(out --exact-match ${ARGN})
-	set(${_var} "${out}" PARENT_SCOPE)
 endfunction()

resources/cmake/macros/GetGitRevisionDescription.cmake.in

@@ -23,9 +23,12 @@ if(HEAD_CONTENTS MATCHES "ref")
 	string(REPLACE "ref: " "" HEAD_REF "${HEAD_CONTENTS}")
 	if(EXISTS "@GIT_DIR@/${HEAD_REF}")
 		configure_file("@GIT_DIR@/${HEAD_REF}" "@GIT_DATA@/head-ref" COPYONLY)
-	elseif(EXISTS "@GIT_DIR@/logs/${HEAD_REF}")
-		configure_file("@GIT_DIR@/logs/${HEAD_REF}" "@GIT_DATA@/head-ref" COPYONLY)
-		set(HEAD_HASH "${HEAD_REF}")
+	else()
+		configure_file("@GIT_DIR@/packed-refs" "@GIT_DATA@/packed-refs" COPYONLY)
+		file(READ "@GIT_DATA@/packed-refs" PACKED_REFS)
+		if(${PACKED_REFS} MATCHES "([0-9a-z]*) ${HEAD_REF}")
+			set(HEAD_HASH "${CMAKE_MATCH_1}")
+		endif()
 	endif()
 else()
 	# detached HEAD