$ git clone -n https://src.fedoraproject.org/rpms/perl-Kwiki.git /var/lib/mock/f41-build-780079-13558/root/chroot_tmpdir/scmroot/perl-Kwiki
Cloning into '/var/lib/mock/f41-build-780079-13558/root/chroot_tmpdir/scmroot/perl-Kwiki'...
$ git fetch origin 82d863493283197deca9d4f0953af09929c9d1ae:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Kwiki
 * [new ref]         82d863493283197deca9d4f0953af09929c9d1ae -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 82d8634 Eliminate use of obsolete %patchN syntax (#2283636)