$ git clone -n https://src.fedoraproject.org/rpms/golang-bug-serial-1.git /var/lib/mock/f40-build-781752-131818/root/chroot_tmpdir/scmroot/golang-bug-serial-1
Cloning into '/var/lib/mock/f40-build-781752-131818/root/chroot_tmpdir/scmroot/golang-bug-serial-1'...
$ git fetch origin abaf79da83068183433fee3549b5ce9e95f7bc5e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-bug-serial-1
 * [new ref]         abaf79da83068183433fee3549b5ce9e95f7bc5e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at abaf79d Update to latest version (#2264655)