Merge pull request #4079 from dachary/wip-11157-firefly

doc,tests: force checkout of submodules

Reviewed-by: David Zafman <dzafman@redhat.com>

autogen.sh

@@ -23,6 +23,15 @@ else
   exit 1
 fi
 
+if test -d ".git" ; then
+  force=$(if git submodule usage 2>&1 | grep --quiet 'update.*--force'; then echo --force ; fi)
+  if ! git submodule sync || ! git submodule update $force --init --recursive; then
+    echo "Error: could not initialize submodule projects"
+    echo "  Network connectivity might be required."
+    exit 1
+  fi
+fi
+
 rm -f config.cache
 aclocal -I m4 --install
 check_for_pkg_config