$ git clone -n https://src.fedoraproject.org/rpms/nbc.git /var/lib/mock/f41-build-1303094-23490/root/chroot_tmpdir/scmroot/nbc
Cloning into '/var/lib/mock/f41-build-1303094-23490/root/chroot_tmpdir/scmroot/nbc'...
$ git fetch origin 905efb44f49a476caefd33f5868d3d49667b9457:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nbc
 * [new ref]         905efb44f49a476caefd33f5868d3d49667b9457 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 905efb4 Eliminate use of obsolete %patchN syntax (#2283636)