1#
2# Internal file for GetGitRevisionDescription.cmake
3#
4# Requires CMake 2.6 or newer (uses the 'function' command)
5#
6# Original Author:
7# 2009-2010 Ryan Pavlik <rpavlik@iastate.edu> <abiryan@ryand.net>
8# http://academic.cleardefinition.com
9# Iowa State University HCI Graduate Program/VRAC
10#
11# Copyright Iowa State University 2009-2010.
12# Distributed under the Boost Software License, Version 1.0.
13# (See accompanying file LICENSE_1_0.txt or copy at
14# http://www.boost.org/LICENSE_1_0.txt)
15
16set(HEAD_HASH)
17
18file(READ "@HEAD_FILE@" HEAD_CONTENTS LIMIT 1024)
19
20string(STRIP "${HEAD_CONTENTS}" HEAD_CONTENTS)
21set(GIT_DIR "@GIT_DIR@")
22# handle git-worktree
23if(EXISTS "${GIT_DIR}/commondir")
24	file(READ "${GIT_DIR}/commondir" GIT_DIR_NEW LIMIT 1024)
25	string(STRIP "${GIT_DIR_NEW}" GIT_DIR_NEW)
26	if(NOT IS_ABSOLUTE "${GIT_DIR_NEW}")
27		get_filename_component(GIT_DIR_NEW ${GIT_DIR}/${GIT_DIR_NEW} ABSOLUTE)
28	endif()
29	if(EXISTS "${GIT_DIR_NEW}")
30		set(GIT_DIR "${GIT_DIR_NEW}")
31	endif()
32endif()
33if(HEAD_CONTENTS MATCHES "ref")
34	# named branch
35	string(REPLACE "ref: " "" HEAD_REF "${HEAD_CONTENTS}")
36	if(EXISTS "${GIT_DIR}/${HEAD_REF}")
37		configure_file("${GIT_DIR}/${HEAD_REF}" "@GIT_DATA@/head-ref" COPYONLY)
38	elseif(EXISTS "${GIT_DIR}/logs/${HEAD_REF}")
39		configure_file("${GIT_DIR}/logs/${HEAD_REF}" "@GIT_DATA@/head-ref" COPYONLY)
40		set(HEAD_HASH "${HEAD_REF}")
41	endif()
42else()
43	# detached HEAD
44	configure_file("${GIT_DIR}/HEAD" "@GIT_DATA@/head-ref" COPYONLY)
45endif()
46
47if(NOT HEAD_HASH)
48	file(READ "@GIT_DATA@/head-ref" HEAD_HASH LIMIT 1024)
49	string(STRIP "${HEAD_HASH}" HEAD_HASH)
50endif()
51