1 files changed, 46 insertions, 0 deletions
diff --git a/src/cmake/macros/FindGit.cmake b/src/cmake/macros/FindGit.cmake
new file mode 100644
index 0000000000..a37370c849
--- /dev/null
+++ b/src/cmake/macros/FindGit.cmake
@@ -0,0 +1,46 @@
+# Copyright (C)
+#
+# This file is free software; as a special exception the author gives
+# unlimited permission to copy and/or distribute it, with or without
+# modifications, as long as this notice is preserved.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY, to the extent permitted by law; without even the
+# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+include(${CMAKE_SOURCE_DIR}/src/cmake/macros/EnsureVersion.cmake)
+
+set(_REQUIRED_GIT_VERSION "1.7")
+
+find_program(GIT_EXECUTABLE
+  NAMES
+    git git.cmd
+  HINTS
+    ENV PATH
+  DOC "Full path to git commandline client"
+)
+MARK_AS_ADVANCED(GIT_EXECUTABLE)
+
+if(NOT GIT_EXECUTABLE)
+  message(FATAL_ERROR "
+    Git was NOT FOUND on your system - did you forget to install a recent version, or setting the path to it?
+    Observe that for revision hash/date to work you need at least version ${_REQUIRED_GIT_VERSION}")
+else()
+  message(STATUS "Found git binary : ${GIT_EXECUTABLE}")
+  execute_process(
+    COMMAND "${GIT_EXECUTABLE}" --version
+    WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}"
+    OUTPUT_VARIABLE _GIT_VERSION
+    ERROR_QUIET
+  )
+
+  # make sure we're using minimum the required version of git, so the "dirty-testing" will work properly
+  ensure_version( "${_REQUIRED_GIT_VERSION}" "${_GIT_VERSION}" _GIT_VERSION_OK)
+
+  # throw an error if we don't have a recent enough version of git...
+  if(NOT _GIT_VERSION_OK)
+    message(STATUS "Git version too old : ${_GIT_VERSION}")
+    message(FATAL_ERROR "
+      Git was found but is OUTDATED - did you forget to install a recent version, or setting the path to it?
+      Observe that for revision hash/date to work you need at least version ${_REQUIRED_GIT_VERSION}")
+  endif()
+endif()