$ git clone -n https://src.fedoraproject.org/rpms/nrg2iso.git /var/lib/mock/f41-build-772704-13507/root/chroot_tmpdir/scmroot/nrg2iso
Cloning into '/var/lib/mock/f41-build-772704-13507/root/chroot_tmpdir/scmroot/nrg2iso'...
$ git fetch origin be6faeeecc813e2ab661cdb6c5bf0e8e6e63a23e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nrg2iso
 * [new ref]         be6faeeecc813e2ab661cdb6c5bf0e8e6e63a23e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at be6faee Eliminate use of obsolete %patchN syntax (#2283636)