$ git clone -n https://src.fedoraproject.org/rpms/xfe.git /var/lib/mock/f40-build-2252081-54170/root/chroot_tmpdir/scmroot/xfe
Cloning into '/var/lib/mock/f40-build-2252081-54170/root/chroot_tmpdir/scmroot/xfe'...
$ git fetch origin f2aa8ace31858bea1785a711cdfa30f35cf81ed4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xfe
 * [new ref]         f2aa8ace31858bea1785a711cdfa30f35cf81ed4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f2aa8ac 1.46