$ git clone -n https://src.fedoraproject.org/rpms/gnome-control-center.git /var/lib/mock/f39-build-1696853-41181/root/chroot_tmpdir/scmroot/gnome-control-center
Cloning into '/var/lib/mock/f39-build-1696853-41181/root/chroot_tmpdir/scmroot/gnome-control-center'...
$ git fetch origin 2d2118f75e192e92604d697ce5321d6facc559c1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnome-control-center
 * [new ref]         2d2118f75e192e92604d697ce5321d6facc559c1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2d2118f Update to 45.1