$ git clone -n https://src.fedoraproject.org/rpms/gnome-control-center.git /var/lib/mock/f39-build-1989681-43357/root/chroot_tmpdir/scmroot/gnome-control-center
Cloning into '/var/lib/mock/f39-build-1989681-43357/root/chroot_tmpdir/scmroot/gnome-control-center'...
$ git fetch origin 0dc535854b08cf0fe50809e514f0ad14772e21e9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnome-control-center
 * [new ref]         0dc535854b08cf0fe50809e514f0ad14772e21e9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0dc5358 Update to 45.2