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 "${HEAD_CONTENTS}" HEAD_CONTENTS)
21if(HEAD_CONTENTS MATCHES "ref")
22	# named branch
23	string(REPLACE "ref: " "" HEAD_REF "${HEAD_CONTENTS}")
24	if(EXISTS "@GIT_DIR@/${HEAD_REF}")
25		configure_file("@GIT_DIR@/${HEAD_REF}" "@GIT_DATA@/head-ref" COPYONLY)
26	else()
27		configure_file("@GIT_DIR@/packed-refs" "@GIT_DATA@/packed-refs" COPYONLY)
28		file(READ "@GIT_DATA@/packed-refs" PACKED_REFS)
29		if(${PACKED_REFS} MATCHES "([0-9a-z]*) ${HEAD_REF}")
30			set(HEAD_HASH "${CMAKE_MATCH_1}")
31		endif()
32	endif()
33else()
34	# detached HEAD
35	configure_file("@GIT_DIR@/HEAD" "@GIT_DATA@/head-ref" COPYONLY)
36endif()
37
38if(NOT HEAD_HASH)
39	file(READ "@GIT_DATA@/head-ref" HEAD_HASH LIMIT 1024)
40	string(STRIP "${HEAD_HASH}" HEAD_HASH)
41endif()
42