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 Iowa State University 2009-2010. 12# Distributed under the Boost Software License, Version 1.0. 13# (See accompanying file LICENSE_1_0.txt or copy at 14# http://www.boost.org/LICENSE_1_0.txt) 15 16set(HEAD_HASH) 17 18file(READ "@HEAD_FILE@" HEAD_CONTENTS LIMIT 1024) 19 20string(STRIP "${HEAD_CONTENTS}" HEAD_CONTENTS) 21if(HEAD_CONTENTS MATCHES "ref") 22 # named branch 23 string(REPLACE "ref: " "" HEAD_REF "${HEAD_CONTENTS}") 24 if(EXISTS "@GIT_DIR@/${HEAD_REF}") 25 configure_file("@GIT_DIR@/${HEAD_REF}" "@GIT_DATA@/head-ref" COPYONLY) 26 else() 27 configure_file("@GIT_DIR@/packed-refs" "@GIT_DATA@/packed-refs" COPYONLY) 28 file(READ "@GIT_DATA@/packed-refs" PACKED_REFS) 29 if(${PACKED_REFS} MATCHES "([0-9a-z]*) ${HEAD_REF}") 30 set(HEAD_HASH "${CMAKE_MATCH_1}") 31 endif() 32 endif() 33else() 34 # detached HEAD 35 configure_file("@GIT_DIR@/HEAD" "@GIT_DATA@/head-ref" COPYONLY) 36endif() 37 38if(NOT HEAD_HASH) 39 file(READ "@GIT_DATA@/head-ref" HEAD_HASH LIMIT 1024) 40 string(STRIP "${HEAD_HASH}" HEAD_HASH) 41endif() 42