$ git clone -n https://src.fedoraproject.org/rpms/gobject-introspection.git /var/lib/mock/f39-build-1453531-32886/root/chroot_tmpdir/scmroot/gobject-introspection
Cloning into '/var/lib/mock/f39-build-1453531-32886/root/chroot_tmpdir/scmroot/gobject-introspection'...
$ git fetch origin 13f99faa109f335344d304f34277c51636c224a8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gobject-introspection
 * [new ref]         13f99faa109f335344d304f34277c51636c224a8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 13f99fa Update to 1.78.1