Generate carla package version file (#7470)

* First implementation

* Small fixes

Unreal/CMakeLists.txt

@@ -368,6 +368,14 @@ function(add_carla_ue_package_target TARGET_NAME_SUFFIX UE_BUILD_CONFIGURATION)
   add_custom_command(
     TARGET carla-unreal-package${TARGET_NAME_SUFFIX}
     POST_BUILD
+    COMMAND ${CMAKE_COMMAND} -E echo "********** PACKAGE CREATING VERSION FILE UNREAL PACKAGE EXTRA FILES STARTED **********"
+    COMMAND ${CMAKE_COMMAND}
+      -DCARLA_SOURCE_DIR=${CARLA_SOURCE_DIR}
+      -DCARLA_UNREAL_ENGINE_PATH=${CARLA_UNREAL_ENGINE_PATH}
+      -DCARLA_PACKAGE_VERSION_FILE=${CARLA_TARGET_PACKAGE_PATH}/VERSION
+      -P${CMAKE_CURRENT_SOURCE_DIR}/Package/CreateCarlaVersionFile.cmake
+    COMMAND ${CMAKE_COMMAND} -E echo "********** PACKAGE VERSION FILE UNREAL PACKAGE EXTRA FILES COMPLETED **********"
+
     COMMAND ${CMAKE_COMMAND} -E echo "********** PACKAGE REMOVING UNREAL PACKAGE EXTRA FILES STARTED **********"
     COMMAND ${CMAKE_COMMAND}
       -DCARLA_TARGET_PACKAGE_PATH=${CARLA_TARGET_PACKAGE_PATH}

Unreal/Package/CreateCarlaVersionFile.cmake

@@ -0,0 +1,28 @@
+execute_process(
+  COMMAND git log -1 --format=%H
+  WORKING_DIRECTORY ${CARLA_SOURCE_DIR}
+  OUTPUT_VARIABLE CARLA_GIT_HASH
+  OUTPUT_STRIP_TRAILING_WHITESPACE
+)
+
+execute_process(
+  COMMAND git log -1 --format=%H
+  WORKING_DIRECTORY ${CARLA_SOURCE_DIR}/Unreal/CarlaUnreal/Content/Carla
+  OUTPUT_VARIABLE CONTENT_GIT_HASH
+  OUTPUT_STRIP_TRAILING_WHITESPACE
+)
+
+execute_process(
+  COMMAND git log -1 --format=%H
+  WORKING_DIRECTORY ${CARLA_UNREAL_ENGINE_PATH}
+  OUTPUT_VARIABLE UNREAL_ENGINE_GIT_HASH
+  OUTPUT_STRIP_TRAILING_WHITESPACE
+)
+
+file (
+  WRITE
+    ${CARLA_PACKAGE_VERSION_FILE}
+    "Carla git hash:         ${CARLA_GIT_HASH}\n"
+    "Content git hash:       ${CONTENT_GIT_HASH}\n"
+    "UnrealEngine git hash:  ${UNREAL_ENGINE_GIT_HASH}\n"
+)