generate release information for metainfo file from git tag

CMakeLists.txt

@@ -224,8 +224,13 @@ install(
     DESTINATION ${CMAKE_INSTALL_DATADIR}/icons/hicolor/128x128/apps/
     RENAME org.mavlink.qgroundcontrol.png
 )
+configure_file(
+    ${CMAKE_SOURCE_DIR}/deploy/org.mavlink.qgroundcontrol.metainfo.xml.in
+    ${CMAKE_BINARY_DIR}/metainfo/org.mavlink.qgroundcontrol.metainfo.xml
+    @ONLY
+)
 install(
-    FILES ${CMAKE_SOURCE_DIR}/deploy/org.mavlink.qgroundcontrol.metainfo.xml
+    FILES ${CMAKE_BINARY_DIR}/metainfo/org.mavlink.qgroundcontrol.metainfo.xml
     DESTINATION ${CMAKE_INSTALL_DATADIR}/metainfo/
 )
 

cmake/Git.cmake

@@ -23,3 +23,13 @@ execute_process(COMMAND ${GIT_EXECUTABLE} describe --always --tags
                 WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
                 OUTPUT_VARIABLE APP_VERSION_STR
                 OUTPUT_STRIP_TRAILING_WHITESPACE)
+
+execute_process(COMMAND ${GIT_EXECUTABLE} describe --abbrev=0
+                WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+                OUTPUT_VARIABLE REL_VERSION
+                OUTPUT_STRIP_TRAILING_WHITESPACE)
+
+execute_process(COMMAND ${GIT_EXECUTABLE} log -1 --format=%aI ${REL_VERSION}
+                WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+                OUTPUT_VARIABLE REL_DATE
+                OUTPUT_STRIP_TRAILING_WHITESPACE)

deploy/org.mavlink.qgroundcontrol.metainfo.xml.in

@@ -24,6 +24,10 @@
 
   <content_rating type="oars-1.1" />
 
+  <releases>
+    <release date="@REL_DATE@" version="@REL_VERSION@"/>
+  </releases>
+
   <launchable type="desktop-id">org.mavlink.qgroundcontrol.desktop</launchable>
   <screenshots>
     <screenshot type="default">