$ git clone -n https://src.fedoraproject.org/rpms/stun.git /var/lib/mock/f41-build-1127526-20334/root/chroot_tmpdir/scmroot/stun
Cloning into '/var/lib/mock/f41-build-1127526-20334/root/chroot_tmpdir/scmroot/stun'...
$ git fetch origin b5548d6f3ddc3792e314d01868268f72f0f848d1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/stun
 * [new ref]         b5548d6f3ddc3792e314d01868268f72f0f848d1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b5548d6 Eliminate use of obsolete %patchN syntax (#2283636)