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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
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+# trust the values of the 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
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+# the output so that it tests 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,
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+# and adjusting the output so that it tests false if there was no exact
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+# matching tag.
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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:
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+# 2009-2010 Ryan Pavlik <rpavlik@iastate.edu> <abiryan@ryand.net>
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+# http://academic.cleardefinition.com
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+# Iowa State University HCI Graduate Program/VRAC
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+#
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+# Copyright Iowa State University 2009-2010.
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+# Distributed under the Boost Software License, Version 1.0.
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+# (See accompanying file LICENSE_1_0.txt or copy at
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+# 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,
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+# to find the path to this 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_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} "GITDIR-NOTFOUND" PARENT_SCOPE)
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+ set(${_hashvar} "GITDIR-NOTFOUND" PARENT_SCOPE)
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+ return()
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+ endif()
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+ set(GIT_DIR "${GIT_PARENT_DIR}/.git")
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+ endwhile()
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+ 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" "${HEAD_FILE}" COPYONLY)
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+
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+ configure_file("${_gitdescmoddir}/GetGitRevisionDescription.cmake.in"
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+ "${GIT_DATA}/grabRef.cmake"
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+ @ONLY)
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+ include("${GIT_DATA}/grabRef.cmake")
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+
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+ set(${_refspecvar} "${HEAD_REF}" PARENT_SCOPE)
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+ set(${_hashvar} "${HEAD_HASH}" PARENT_SCOPE)
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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(${_var} "GIT-NOTFOUND" PARENT_SCOPE)
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+ return()
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+ endif()
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+ if(NOT hash)
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+ set(${_var} "HEAD-HASH-NOTFOUND" PARENT_SCOPE)
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+ return()
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+ endif()
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+
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+ # TODO sanitize
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+ #if((${ARGN}" MATCHES "&&") OR
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+ # (ARGN MATCHES "||") OR
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+ # (ARGN MATCHES "\\;"))
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+ # message("Please report the following error to the project!")
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+ # message(FATAL_ERROR "Looks like someone's doing something nefarious with git_describe! Passed arguments ${ARGN}")
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+ #endif()
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+
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+ #message(STATUS "Arguments to execute_process: ${ARGN}")
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+
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+ execute_process(COMMAND
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+ "${GIT_EXECUTABLE}"
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+ describe
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+ ${hash}
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+ ${ARGN}
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+ WORKING_DIRECTORY
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+ "${CMAKE_SOURCE_DIR}"
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+ RESULT_VARIABLE
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+ res
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+ OUTPUT_VARIABLE
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+ out
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+ ERROR_QUIET
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+ OUTPUT_STRIP_TRAILING_WHITESPACE)
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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(${_var} "${out}" PARENT_SCOPE)
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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} "${out}" PARENT_SCOPE)
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+endfunction()
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Daniel Molkentin