cmake/GetGitRevisionDescription.cmake.in

   1 #
   2 # Internal file for GetGitRevisionDescription.cmake
   3 #
   4 # Requires CMake 2.6 or newer (uses the 'function' command)
   5 #
   6 # Original Author:
   7 # 2009-2010 Ryan Pavlik <rpavlik@iastate.edu> <abiryan@ryand.net>
   8 # http://academic.cleardefinition.com
   9 # Iowa State University HCI Graduate Program/VRAC
  10 #
  11 # Copyright 2009-2012, Iowa State University
  12 # Copyright 2011-2015, Contributors
  13 # Distributed under the Boost Software License, Version 1.0.
  14 # (See accompanying file LICENSE_1_0.txt or copy at
  15 # http://www.boost.org/LICENSE_1_0.txt)
  16 # SPDX-License-Identifier: BSL-1.0
  17
  18 set(HEAD_HASH)
  19
  20 file(READ "@HEAD_FILE@" HEAD_CONTENTS LIMIT 1024)
  21
  22 string(STRIP "${HEAD_CONTENTS}" HEAD_CONTENTS)
  23 if(HEAD_CONTENTS MATCHES "ref")
  24         # named branch
  25         string(REPLACE "ref: " "" HEAD_REF "${HEAD_CONTENTS}")
  26         if(EXISTS "@GIT_DIR@/${HEAD_REF}")
  27                 configure_file("@GIT_DIR@/${HEAD_REF}" "@GIT_DATA@/head-ref" COPYONLY)
  28         else()
  29                 configure_file("@GIT_DIR@/packed-refs" "@GIT_DATA@/packed-refs" COPYONLY)
  30                 file(READ "@GIT_DATA@/packed-refs" PACKED_REFS)
  31                 if(${PACKED_REFS} MATCHES "([0-9a-z]*) ${HEAD_REF}")
  32                         set(HEAD_HASH "${CMAKE_MATCH_1}")
  33                 endif()
  34         endif()
  35 else()
  36         # detached HEAD
  37         configure_file("@GIT_DIR@/HEAD" "@GIT_DATA@/head-ref" COPYONLY)
  38 endif()
  39
  40 if(NOT HEAD_HASH)
  41         file(READ "@GIT_DATA@/head-ref" HEAD_HASH LIMIT 1024)
  42         string(STRIP "${HEAD_HASH}" HEAD_HASH)
  43 endif()