$ git clone -n https://src.fedoraproject.org/rpms/rubygem-clutter-gdk.git /var/lib/mock/f45-build-34825-691/root/chroot_tmpdir/scmroot/rubygem-clutter-gdk
Cloning into '/var/lib/mock/f45-build-34825-691/root/chroot_tmpdir/scmroot/rubygem-clutter-gdk'...
$ git fetch origin 7350ef9284873c9554d687edc4404cc9b760b46c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-clutter-gdk
 * [new ref]         7350ef9284873c9554d687edc4404cc9b760b46c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7350ef9 4.3.8 entry