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# https://github.com/rpavlik/cmake-modules
#
# - Returns a version string from Git
#
# These functions force a re-configure on each git commit so that you can
# trust the values of the variables in your build system.
#
# get_git_head_revision(<refspecvar> <hashvar> [<additional arguments to git describe> ...])
#
# Returns the refspec and sha hash of the current head revision
#
# git_describe(<var> [<additional arguments to git describe> ...])
#
# Returns the results of git describe on the source tree, and adjusting
# the output so that it tests false if an error occurs.
#
# git_get_exact_tag(<var> [<additional arguments to git describe> ...])
#
# Returns the results of git describe --exact-match on the source tree,
# and adjusting the output so that it tests false if there was no exact
# matching tag.
#
# Requires CMake 2.6 or newer (uses the 'function' command)
#
# Original Author:
# 2009-2010 Ryan Pavlik <rpavlik@iastate.edu> <abiryan@ryand.net>
# http://academic.cleardefinition.com
# Iowa State University HCI Graduate Program/VRAC
#
# Copyright Iowa State University 2009-2010.
# Distributed under the Boost Software License, Version 1.0.
# (See accompanying file LICENSE_1_0.txt or copy at
# http://www.boost.org/LICENSE_1_0.txt)
if(__get_git_revision_description)
return()
endif()
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 ${CMAKE_CURRENT_LIST_FILE} PATH)
function(get_git_dir _gitdir)
# check FORCED_GIT_DIR first
if(FORCED_GIT_DIR)
set(${_gitdir} ${FORCED_GIT_DIR} PARENT_SCOPE)
return()
endif()
# check GIT_DIR in environment
set(GIT_DIR $ENV{GIT_DIR})
if(NOT GIT_DIR)
set(GIT_PARENT_DIR ${CMAKE_CURRENT_SOURCE_DIR})
set(GIT_DIR ${GIT_PARENT_DIR}/.git)
endif()
# .git dir not found, search parent directories
while(NOT EXISTS ${GIT_DIR})
set(GIT_PREVIOUS_PARENT ${GIT_PARENT_DIR})
get_filename_component(GIT_PARENT_DIR ${GIT_PARENT_DIR} PATH)
if(GIT_PARENT_DIR STREQUAL GIT_PREVIOUS_PARENT)
return()
endif()
set(GIT_DIR ${GIT_PARENT_DIR}/.git)
endwhile()
# check if this is a submodule
if(NOT IS_DIRECTORY ${GIT_DIR})
file(READ ${GIT_DIR} submodule)
string(REGEX REPLACE "gitdir: (.*)\n$" "\\1" GIT_DIR_RELATIVE ${submodule})
get_filename_component(SUBMODULE_DIR ${GIT_DIR} PATH)
get_filename_component(GIT_DIR ${SUBMODULE_DIR}/${GIT_DIR_RELATIVE} ABSOLUTE)
endif()
set(${_gitdir} ${GIT_DIR} PARENT_SCOPE)
endfunction()
function(get_git_head_revision _refspecvar _hashvar)
get_git_dir(GIT_DIR)
if(NOT GIT_DIR)
return()
endif()
set(GIT_DATA ${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/git-data)
if(NOT EXISTS ${GIT_DATA})
file(MAKE_DIRECTORY ${GIT_DATA})
endif()
if(NOT EXISTS ${GIT_DIR}/HEAD)
return()
endif()
set(HEAD_FILE ${GIT_DATA}/HEAD)
configure_file(${GIT_DIR}/HEAD ${HEAD_FILE} COPYONLY)
configure_file(${_gitdescmoddir}/GetGitRevisionDescription.cmake.in
${GIT_DATA}/grabRef.cmake
@ONLY)
include(${GIT_DATA}/grabRef.cmake)
set(${_refspecvar} ${HEAD_REF} PARENT_SCOPE)
set(${_hashvar} ${HEAD_HASH} PARENT_SCOPE)
endfunction()
function(git_describe _var)
get_git_dir(GIT_DIR)
if(NOT GIT_DIR)
return()
endif()
if(NOT GIT_FOUND)
find_package(Git QUIET)
endif()
if(NOT GIT_FOUND)
set(${_var} "GIT-NOTFOUND" PARENT_SCOPE)
return()
endif()
get_git_head_revision(refspec hash)
if(NOT hash)
set(${_var} "HEAD-HASH-NOTFOUND" PARENT_SCOPE)
return()
endif()
execute_process(COMMAND
${GIT_EXECUTABLE}
describe
${hash}
${ARGN}
WORKING_DIRECTORY
${GIT_DIR}
RESULT_VARIABLE
res
OUTPUT_VARIABLE
out
ERROR_QUIET
OUTPUT_STRIP_TRAILING_WHITESPACE)
if(NOT res EQUAL 0)
set(out "${out}-${res}-NOTFOUND")
endif()
set(${_var} ${out} PARENT_SCOPE)
endfunction()
function(git_timestamp _var)
get_git_dir(GIT_DIR)
if(NOT GIT_DIR)
return()
endif()
if(NOT GIT_FOUND)
find_package(Git QUIET)
endif()
if(NOT GIT_FOUND)
return()
endif()
get_git_head_revision(refspec hash)
if(NOT hash)
set(${_var} "HEAD-HASH-NOTFOUND" PARENT_SCOPE)
return()
endif()
execute_process(COMMAND ${GIT_EXECUTABLE} log -1 --format="%ci" ${hash} ${ARGN}
WORKING_DIRECTORY ${GIT_DIR}
RESULT_VARIABLE res
OUTPUT_VARIABLE out
ERROR_QUIET
OUTPUT_STRIP_TRAILING_WHITESPACE)
if(res EQUAL 0)
string(REGEX REPLACE "[-\" :]" "" out ${out})
string(SUBSTRING ${out} 0 12 out)
else()
set(out "${out}-${res}-NOTFOUND")
endif()
set(${_var} ${out} PARENT_SCOPE)
endfunction()
function(git_get_exact_tag _var)
git_describe(out --exact-match ${ARGN})
set(${_var} ${out} PARENT_SCOPE)
endfunction()
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