Atlas - GetGitRevisionDescription.cmake.in
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[FILE BEGIN]
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 <[email protected]> <[email protected]>
8# http://academic.cleardefinition.com
9# Iowa State University HCI Graduate Program/VRAC
10#
11# Copyright 2009-2012, Iowa State University
12# Copyright 2011-2015, Contributors
13# Distributed under the Boost Software License, Version 1.0.
14# (See accompanying file LICENSE_1_0.txt or copy at
15# http://www.boost.org/LICENSE_1_0.txt)
16# SPDX-License-Identifier: BSL-1.0
17
18set(HEAD_HASH)
19
20file(READ "@HEAD_FILE@" HEAD_CONTENTS LIMIT 1024)
21
22string(STRIP "${HEAD_CONTENTS}" HEAD_CONTENTS)
23if(HEAD_CONTENTS MATCHES "ref")
24	# named branch
25	string(REPLACE "ref: " "" HEAD_REF "${HEAD_CONTENTS}")
26	if(EXISTS "@GIT_DIR@/${HEAD_REF}")
27		configure_file("@GIT_DIR@/${HEAD_REF}" "@GIT_DATA@/head-ref" COPYONLY)
28	elseif(EXISTS "@GIT_DIR@/packed-refs")
29		configure_file("@GIT_DIR@/packed-refs" "@GIT_DATA@/packed-refs" COPYONLY)
30		file(READ "@GIT_DATA@/packed-refs" PACKED_REFS)
31		if(${PACKED_REFS} MATCHES "([0-9a-z]*) ${HEAD_REF}")
32			set(HEAD_HASH "${CMAKE_MATCH_1}")
33		endif()
34	elseif(EXISTS "@GIT_DIR@/reftable/tables.list")
35		configure_file("@GIT_DIR@/reftable/tables.list" "@GIT_DATA@/reftable-tables.list" COPYONLY)
36	endif()
37else()
38	# detached HEAD
39	configure_file("@GIT_DIR@/HEAD" "@GIT_DATA@/head-ref" COPYONLY)
40endif()
41
42if(NOT HEAD_HASH AND EXISTS "@GIT_DATA@/head-ref")
43	file(READ "@GIT_DATA@/head-ref" HEAD_HASH LIMIT 1024)
44	string(STRIP "${HEAD_HASH}" HEAD_HASH)
45endif()
46
[FILE END]
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