$ git clone -n https://src.fedoraproject.org/rpms/golang-bug-serial-1.git /var/lib/mock/f45-build-11702-434/root/chroot_tmpdir/scmroot/golang-bug-serial-1
Cloning into '/var/lib/mock/f45-build-11702-434/root/chroot_tmpdir/scmroot/golang-bug-serial-1'...
$ git fetch origin 9b293e8f1cc7c4e6dc6a53e321b2fd00bf4e9cbb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-bug-serial-1
 * [new ref]         9b293e8f1cc7c4e6dc6a53e321b2fd00bf4e9cbb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9b293e8 Update to 1.8.0 upstream release