$ git clone -n https://src.fedoraproject.org/rpms/milter-greylist.git /var/lib/mock/f41-build-1022367-18070/root/chroot_tmpdir/scmroot/milter-greylist
Cloning into '/var/lib/mock/f41-build-1022367-18070/root/chroot_tmpdir/scmroot/milter-greylist'...
$ git fetch origin 955949bd5bc5b8f359a518ee6c66472892f3b375:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/milter-greylist
 * [new ref]         955949bd5bc5b8f359a518ee6c66472892f3b375 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 955949b Eliminate use of obsolete %patchN syntax (#2283636)