$ git clone -n https://src.fedoraproject.org/rpms/gmult.git /var/lib/mock/f39-build-1569831-37733/root/chroot_tmpdir/scmroot/gmult
Cloning into '/var/lib/mock/f39-build-1569831-37733/root/chroot_tmpdir/scmroot/gmult'...
$ git fetch origin 9605254bb6545697c8dfb94d4ab12190f8fb1668:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gmult
 * [new ref]         9605254bb6545697c8dfb94d4ab12190f8fb1668 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9605254 13.0