$ git clone -n https://src.fedoraproject.org/rpms/golang-github-sean-seed.git /var/lib/mock/f41-build-1036377-18724/root/chroot_tmpdir/scmroot/golang-github-sean-seed
Cloning into '/var/lib/mock/f41-build-1036377-18724/root/chroot_tmpdir/scmroot/golang-github-sean-seed'...
$ git fetch origin fd518230091f3c86d45edf67ae8e9fb2fe1bd5c7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-sean-seed
 * [new ref]         fd518230091f3c86d45edf67ae8e9fb2fe1bd5c7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fd51823 Fix FTBFS