Extracting proper libraries, include and library path from fastjet-config
[u/mrichter/AliRoot.git] / cmake / GetGitRevisionDescription.cmake
1 # - Returns a version string from Git
2 #
3 # These functions force a re-configure on each git commit so that you can
4 # trust the values of the variables in your build system.
5 #
6 #  get_git_head_revision(<refspecvar> <hashvar> [<additional arguments to git describe> ...])
7 #
8 # Returns the refspec and sha hash of the current head revision
9 #
10 #  git_describe(<var> [<additional arguments to git describe> ...])
11 #
12 # Returns the results of git describe on the source tree, and adjusting
13 # the output so that it tests false if an error occurs.
14 #
15 #  git_get_exact_tag(<var> [<additional arguments to git describe> ...])
16 #
17 # Returns the results of git describe --exact-match on the source tree,
18 # and adjusting the output so that it tests false if there was no exact
19 # matching tag.
20 #
21 # Requires CMake 2.6 or newer (uses the 'function' command)
22 #
23 # Original Author:
24 # 2009-2010 Ryan Pavlik <rpavlik@iastate.edu> <abiryan@ryand.net>
25 # http://academic.cleardefinition.com
26 # Iowa State University HCI Graduate Program/VRAC
27 #
28 # Copyright Iowa State University 2009-2010.
29 # Distributed under the Boost Software License, Version 1.0.
30 # (See accompanying file LICENSE_1_0.txt or copy at
31 # http://www.boost.org/LICENSE_1_0.txt)
32
33 if(__get_git_revision_description)
34         return()
35 endif()
36 set(__get_git_revision_description YES)
37
38 # We must run the following at "include" time, not at function call time,
39 # to find the path to this module rather than the path to a calling list file
40 get_filename_component(_gitdescmoddir ${CMAKE_CURRENT_LIST_FILE} PATH)
41
42 function(get_git_head_revision _refspecvar _hashvar)
43         set(GIT_PARENT_DIR "${CMAKE_CURRENT_LIST_DIR}")
44         set(GIT_DIR "${GIT_PARENT_DIR}/.git")
45         while(NOT EXISTS "${GIT_DIR}")  # .git dir not found, search parent directories
46                 set(GIT_PREVIOUS_PARENT "${GIT_PARENT_DIR}")
47                 get_filename_component(GIT_PARENT_DIR ${GIT_PARENT_DIR} PATH)
48                 if(GIT_PARENT_DIR STREQUAL GIT_PREVIOUS_PARENT)
49                         # We have reached the root directory, we are not in git
50                         set(${_refspecvar} "GITDIR-NOTFOUND" PARENT_SCOPE)
51                         set(${_hashvar} "GITDIR-NOTFOUND" PARENT_SCOPE)
52                         return()
53                 endif()
54                 set(GIT_DIR "${GIT_PARENT_DIR}/.git")
55         endwhile()
56         # check if this is a submodule
57         if(NOT IS_DIRECTORY ${GIT_DIR})
58                 file(READ ${GIT_DIR} submodule)
59                 string(REGEX REPLACE "gitdir: (.*)\n$" "\\1" GIT_DIR_RELATIVE ${submodule})
60                 get_filename_component(SUBMODULE_DIR ${GIT_DIR} PATH)
61                 get_filename_component(GIT_DIR ${SUBMODULE_DIR}/${GIT_DIR_RELATIVE} ABSOLUTE)
62         endif()
63         set(GIT_DATA "${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/git-data")
64         if(NOT EXISTS "${GIT_DATA}")
65                 file(MAKE_DIRECTORY "${GIT_DATA}")
66         endif()
67
68         if(NOT EXISTS "${GIT_DIR}/HEAD")
69                 return()
70         endif()
71         set(HEAD_FILE "${GIT_DATA}/HEAD")
72         configure_file("${GIT_DIR}/HEAD" "${HEAD_FILE}" COPYONLY)
73
74         configure_file("${_gitdescmoddir}/GetGitRevisionDescription.cmake.in"
75                 "${GIT_DATA}/grabRef.cmake"
76                 @ONLY)
77         include("${GIT_DATA}/grabRef.cmake")
78
79         set(${_refspecvar} "${HEAD_REF}" PARENT_SCOPE)
80         set(${_hashvar} "${HEAD_HASH}" PARENT_SCOPE)
81 endfunction()
82
83 function(git_describe _var)
84         if(NOT GIT_FOUND)
85                 find_package(Git QUIET)
86         endif()
87         get_git_head_revision(refspec hash)
88         if(NOT GIT_FOUND)
89                 set(${_var} "GIT-NOTFOUND" PARENT_SCOPE)
90                 return()
91         endif()
92         if(NOT hash)
93                 set(${_var} "HEAD-HASH-NOTFOUND" PARENT_SCOPE)
94                 return()
95         endif()
96
97         # TODO sanitize
98         #if((${ARGN}" MATCHES "&&") OR
99         #       (ARGN MATCHES "||") OR
100         #       (ARGN MATCHES "\\;"))
101         #       message("Please report the following error to the project!")
102         #       message(FATAL_ERROR "Looks like someone's doing something nefarious with git_describe! Passed arguments ${ARGN}")
103         #endif()
104
105         #message(STATUS "Arguments to execute_process: ${ARGN}")
106
107         execute_process(COMMAND
108                 "${GIT_EXECUTABLE}"
109                 describe
110                 ${hash}
111                 ${ARGN}
112                 WORKING_DIRECTORY
113                 "${AliRoot_SOURCE_DIR}"
114                 RESULT_VARIABLE
115                 res
116                 OUTPUT_VARIABLE
117                 out
118                 ERROR_QUIET
119                 OUTPUT_STRIP_TRAILING_WHITESPACE)
120         if(NOT res EQUAL 0)
121                 set(out "${out}-${res}-NOTFOUND")
122         endif()
123
124         set(${_var} "${out}" PARENT_SCOPE)
125 endfunction()
126
127 function(git_get_exact_tag _var)
128         git_describe(out --exact-match ${ARGN})
129         set(${_var} "${out}" PARENT_SCOPE)
130 endfunction()