Support shallow git checkouts when configuring cmake

git will bale out if we're using a shallow checkout with no tags. Just
fall back to the short commit hash when that happens, so we can still
try and identify when the build was from.

diff --git a/CMakeLists.txt b/CMakeLists.txt
index acacb34a2a510aa58f5d98d92073419b2a7764ed..2355ebe1c8b682d358f15734adf0a9f899c51e29 100644 (file)
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -41,10 +41,18 @@ endif()
 # Pick up a git based version number for development builds
 find_package(Git)
 if (GIT_FOUND AND EXISTS "${CMAKE_SOURCE_DIR}/.git")
-       EXECUTE_PROCESS(COMMAND ${GIT_EXECUTABLE} describe --tags --dirty
-               OUTPUT_VARIABLE GIT_VERSION
-               OUTPUT_STRIP_TRAILING_WHITESPACE)
-       string(REPLACE "onak-" "" VERSION ${GIT_VERSION})
+       if (EXISTS "${CMAKE_SOURCE_DIR}/.git/refs/tags/onak-0.6.2")
+               EXECUTE_PROCESS(
+                       COMMAND ${GIT_EXECUTABLE} describe --tags --dirty
+                       OUTPUT_VARIABLE GIT_VERSION
+                       OUTPUT_STRIP_TRAILING_WHITESPACE)
+               string(REPLACE "onak-" "" VERSION ${GIT_VERSION})
+       else()
+               EXECUTE_PROCESS(
+                       COMMAND ${GIT_EXECUTABLE} rev-parse --short HEAD
+                       OUTPUT_VARIABLE VERSION
+                       OUTPUT_STRIP_TRAILING_WHITESPACE)
+       endif()
 else()
        set(VERSION ${PROJECT_VERSION})
 endif()