genversion-B-GONE

[quassel.git] / cmake / modules / GetGitRevisionDescription.cmake

diff --git a/cmake/modules/GetGitRevisionDescription.cmake b/cmake/modules/GetGitRevisionDescription.cmake
new file mode 100644 (file)
index 0000000..aa2ef71
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+++ b/cmake/modules/GetGitRevisionDescription.cmake
@@ -0,0 +1,131 @@
+# - 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 ${CMAKE_CURRENT_LIST_FILE} PATH)
+
+function(get_git_head_revision _refspecvar _hashvar)
+       set(GIT_PARENT_DIR "${CMAKE_CURRENT_SOURCE_DIR}")
+       set(GIT_DIR "${GIT_PARENT_DIR}/.git")
+       while(NOT EXISTS "${GIT_DIR}")  # .git dir not found, search parent directories
+               set(GIT_PREVIOUS_PARENT "${GIT_PARENT_DIR}")
+               get_filename_component(GIT_PARENT_DIR ${GIT_PARENT_DIR} PATH)
+               if(GIT_PARENT_DIR STREQUAL GIT_PREVIOUS_PARENT)
+                       # We have reached the root directory, we are not in git
+                       set(${_refspecvar} "GITDIR-NOTFOUND" PARENT_SCOPE)
+                       set(${_hashvar} "GITDIR-NOTFOUND" PARENT_SCOPE)
+                       return()
+               endif()
+               set(GIT_DIR "${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(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)
+       if(NOT GIT_FOUND)
+               find_package(Git QUIET)
+       endif()
+       get_git_head_revision(refspec hash)
+       if(NOT GIT_FOUND)
+               set(${_var} "GIT-NOTFOUND" PARENT_SCOPE)
+               return()
+       endif()
+       if(NOT hash)
+               set(${_var} "HEAD-HASH-NOTFOUND" PARENT_SCOPE)
+               return()
+       endif()
+
+       # TODO sanitize
+       #if((${ARGN}" MATCHES "&&") OR
+       #       (ARGN MATCHES "||") OR
+       #       (ARGN MATCHES "\\;"))
+       #       message("Please report the following error to the project!")
+       #       message(FATAL_ERROR "Looks like someone's doing something nefarious with git_describe! Passed arguments ${ARGN}")
+       #endif()
+
+       #message(STATUS "Arguments to execute_process: ${ARGN}")
+
+       execute_process(COMMAND
+               "${GIT_EXECUTABLE}"
+               describe
+               ${hash}
+               ${ARGN}
+               WORKING_DIRECTORY
+               "${CMAKE_SOURCE_DIR}"
+               RESULT_VARIABLE
+               res
+               OUTPUT_VARIABLE
+               out
+               ERROR_QUIET
+               OUTPUT_STRIP_TRAILING_WHITESPACE)
+       if(NOT res EQUAL 0)
+                message(STATUS "RES ${res} OUT ${out}")
+               set(out "${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()