$ git clone -n https://src.fedoraproject.org/rpms/vecmath1.2.git /var/lib/mock/f41-build-1033749-18593/root/chroot_tmpdir/scmroot/vecmath1.2
Cloning into '/var/lib/mock/f41-build-1033749-18593/root/chroot_tmpdir/scmroot/vecmath1.2'...
$ git fetch origin 178ae98f5ac795a05ddd89ed8870b37393e55671:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vecmath1.2
 * [new ref]         178ae98f5ac795a05ddd89ed8870b37393e55671 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 178ae98 Eliminate use of obsolete %patchN syntax (#2283636)