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+# * Returns a version string from Git
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+#
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+# These functions force a re-configure on each git commit so that you can trust the values of the
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+# variables in your build system.
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+#
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+# get_git_head_revision(<refspecvar> <hashvar> [<additional arguments to git describe> ...])
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+#
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+# Returns the refspec and sha hash of the current head revision
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+#
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+# git_describe(<var> [<additional arguments to git describe> ...])
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+#
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+# Returns the results of git describe on the source tree, and adjusting the output so that it tests
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+# false if an error occurs.
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+#
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+# git_get_exact_tag(<var> [<additional arguments to git describe> ...])
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+#
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+# Returns the results of git describe --exact-match on the source tree, and adjusting the output so
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+# that it tests false if there was no exact matching tag.
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+#
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+# git_local_changes(<var>)
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+#
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+# Returns either "CLEAN" or "DIRTY" with respect to uncommitted changes. Uses the return code of
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+# "git diff-index --quiet HEAD --". Does not regard untracked files.
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+#
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+# git_count_parent_commits(<var>)
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+#
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+# Returns number of commits preceeding current commit -1 if git rev-list --count HEAD failed or
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+# "GIT-NOTFOUND" if git executable was not found or "HEAD-HASH-NOTFOUND" if head hash was not found.
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+# I don't know if get_git_head_revision() must be called internally or not, as reason of calling it
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+# is not clear for me also in git_local_changes().
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+#
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+# Requires CMake 2.6 or newer (uses the 'function' command)
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+#
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+# Original Author: 2009-2010 Ryan Pavlik <rpavlik@iastate.edu> <abiryan@ryand.net>
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+# http://academic.cleardefinition.com Iowa State University HCI Graduate Program/VRAC
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+#
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+# Copyright Iowa State University 2009-2010. Distributed under the Boost Software License, Version
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+# 1.0. (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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+
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+if(__get_git_revision_description)
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+ return()
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+endif()
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+set(__get_git_revision_description YES)
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+
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+# We must run the following at "include" time, not at function call time, to find the path to this
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+# module rather than the path to a calling list file
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+get_filename_component(_gitdescmoddir ${CMAKE_CURRENT_LIST_FILE} PATH)
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+
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+function(get_git_head_revision _refspecvar _hashvar)
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+ set(GIT_PARENT_DIR "${CMAKE_CURRENT_SOURCE_DIR}")
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+ set(GIT_DIR "${GIT_PARENT_DIR}/.git")
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+ while(NOT EXISTS "${GIT_DIR}") # .git dir not found, search parent directories
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+ set(GIT_PREVIOUS_PARENT "${GIT_PARENT_DIR}")
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+ get_filename_component(GIT_PARENT_DIR ${GIT_PARENT_DIR} PATH)
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+ if(GIT_PARENT_DIR STREQUAL GIT_PREVIOUS_PARENT)
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+ # We have reached the root directory, we are not in git
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+ set(${_refspecvar}
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+ "GITDIR-NOTFOUND"
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+ PARENT_SCOPE
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+ )
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+ set(${_hashvar}
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+ "GITDIR-NOTFOUND"
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+ PARENT_SCOPE
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+ )
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+ return()
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+ endif()
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+ set(GIT_DIR "${GIT_PARENT_DIR}/.git")
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+ endwhile()
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+ # check if this is a submodule
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+ if(NOT IS_DIRECTORY ${GIT_DIR})
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+ file(READ ${GIT_DIR} submodule)
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+ string(REGEX REPLACE "gitdir: (.*)\n$" "\\1" GIT_DIR_RELATIVE ${submodule})
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+ get_filename_component(SUBMODULE_DIR ${GIT_DIR} PATH)
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+ get_filename_component(GIT_DIR ${SUBMODULE_DIR}/${GIT_DIR_RELATIVE} ABSOLUTE)
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+ endif()
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+ set(GIT_DATA "${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/git-data")
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+ if(NOT EXISTS "${GIT_DATA}")
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+ file(MAKE_DIRECTORY "${GIT_DATA}")
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+ endif()
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+
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+ if(NOT EXISTS "${GIT_DIR}/HEAD")
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+ return()
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+ endif()
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+ set(HEAD_FILE "${GIT_DATA}/HEAD")
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+ configure_file("${GIT_DIR}/HEAD" "${HEAD_FILE}" COPYONLY)
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+
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+ configure_file(
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+ "${_gitdescmoddir}/GetGitRevisionDescription.cmake.in" "${GIT_DATA}/grabRef.cmake" @ONLY
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+ )
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+ include("${GIT_DATA}/grabRef.cmake")
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+
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+ set(${_refspecvar}
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+ "${HEAD_REF}"
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+ PARENT_SCOPE
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+ )
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+ set(${_hashvar}
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+ "${HEAD_HASH}"
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+ PARENT_SCOPE
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+ )
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+endfunction()
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+
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+function(git_describe _var)
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+ if(NOT GIT_FOUND)
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+ find_package(Git QUIET)
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+ endif()
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+ get_git_head_revision(refspec hash)
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+ if(NOT GIT_FOUND)
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+ set(${_var}
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+ "GIT-NOTFOUND"
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+ PARENT_SCOPE
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+ )
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+ return()
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+ endif()
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+ if(NOT hash)
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+ set(${_var}
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+ "HEAD-HASH-NOTFOUND"
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+ PARENT_SCOPE
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+ )
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+ return()
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+ endif()
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+
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+ # TODO sanitize if((${ARGN}" MATCHES "&&") OR (ARGN MATCHES "||") OR (ARGN MATCHES "\\;"))
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+ # message("Please report the following error to the project!") message(FATAL_ERROR "Looks like
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+ # someone's doing something nefarious with git_describe! Passed arguments ${ARGN}") endif()
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+
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+ # message(STATUS "Arguments to execute_process: ${ARGN}")
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+
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+ execute_process(
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+ COMMAND "${GIT_EXECUTABLE}" describe ${hash} ${ARGN}
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+ WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
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+ RESULT_VARIABLE res
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+ OUTPUT_VARIABLE out
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+ ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE
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+ )
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+ if(NOT res EQUAL 0)
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+ set(out "${out}-${res}-NOTFOUND")
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+ endif()
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+
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+ set(${_var}
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+ "${out}"
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+ PARENT_SCOPE
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+ )
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+endfunction()
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+
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+function(git_get_exact_tag _var)
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+ git_describe(out --exact-match ${ARGN})
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+ set(${_var}
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+ "${out}"
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+ PARENT_SCOPE
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+ )
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+endfunction()
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+
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+function(git_local_changes _var)
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+ if(NOT GIT_FOUND)
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+ find_package(Git QUIET)
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+ endif()
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+ get_git_head_revision(refspec hash)
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+ if(NOT GIT_FOUND)
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+ set(${_var}
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+ "GIT-NOTFOUND"
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+ PARENT_SCOPE
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+ )
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+ return()
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+ endif()
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+ if(NOT hash)
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+ set(${_var}
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+ "HEAD-HASH-NOTFOUND"
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+ PARENT_SCOPE
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+ )
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+ return()
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+ endif()
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+
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+ execute_process(
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+ COMMAND "${GIT_EXECUTABLE}" diff-index --quiet HEAD --
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+ WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
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+ RESULT_VARIABLE res
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+ OUTPUT_VARIABLE out
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+ ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE
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+ )
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+ if(res EQUAL 0)
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+ set(${_var}
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+ "CLEAN"
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+ PARENT_SCOPE
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+ )
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+ else()
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+ set(${_var}
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+ "DIRTY"
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+ PARENT_SCOPE
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+ )
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+ endif()
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+endfunction()
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+
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+function(git_count_parent_commits _var)
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+ if(NOT GIT_FOUND)
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+ find_package(Git QUIET)
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+ endif()
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+ get_git_head_revision(refspec hash)
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+ if(NOT GIT_FOUND)
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+ set(${_var}
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+ "GIT-NOTFOUND"
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+ PARENT_SCOPE
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+ )
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+ return()
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+ endif()
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+ if(NOT hash)
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+ set(${_var}
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+ "HEAD-HASH-NOTFOUND"
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+ PARENT_SCOPE
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+ )
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+ return()
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+ endif()
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+
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+ execute_process(
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+ COMMAND "${GIT_EXECUTABLE}" rev-list --count HEAD
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+ WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
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+ RESULT_VARIABLE res
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+ OUTPUT_VARIABLE out
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+ ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE
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+ )
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+ if(res EQUAL 0)
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+ set(${_var}
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+ "${out}"
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+ PARENT_SCOPE
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+ )
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+ else()
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+ set(${_var}
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+ "-1"
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+ PARENT_SCOPE
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+ )
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+ endif()
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+
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+endfunction()
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