build: Derive PulseView version from git tags

[pulseview.git] / CMake / GetGitRevisionDescription.cmake.in

diff --git a/CMake/GetGitRevisionDescription.cmake.in b/CMake/GetGitRevisionDescription.cmake.in
new file mode 100644 (file)
index 0000000..6d8b708
--- /dev/null
+++ b/CMake/GetGitRevisionDescription.cmake.in
@@ -0,0 +1,41 @@
+#
+# Internal file for GetGitRevisionDescription.cmake
+#
+# 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)
+
+set(HEAD_HASH)
+
+file(READ "@HEAD_FILE@" HEAD_CONTENTS LIMIT 1024)
+
+string(STRIP "${HEAD_CONTENTS}" HEAD_CONTENTS)
+if(HEAD_CONTENTS MATCHES "ref")
+       # named branch
+       string(REPLACE "ref: " "" HEAD_REF "${HEAD_CONTENTS}")
+       if(EXISTS "@GIT_DIR@/${HEAD_REF}")
+               configure_file("@GIT_DIR@/${HEAD_REF}" "@GIT_DATA@/head-ref" COPYONLY)
+       else()
+               configure_file("@GIT_DIR@/packed-refs" "@GIT_DATA@/packed-refs" COPYONLY)
+               file(READ "@GIT_DATA@/packed-refs" PACKED_REFS)
+               if(${PACKED_REFS} MATCHES "([0-9a-z]*) ${HEAD_REF}")
+                       set(HEAD_HASH "${CMAKE_MATCH_1}")
+               endif()
+       endif()
+else()
+       # detached HEAD
+       configure_file("@GIT_DIR@/HEAD" "@GIT_DATA@/head-ref" COPYONLY)
+endif()
+
+if(NOT HEAD_HASH)
+       file(READ "@GIT_DATA@/head-ref" HEAD_HASH LIMIT 1024)
+       string(STRIP "${HEAD_HASH}" HEAD_HASH)
+endif()