$ git clone -n https://src.fedoraproject.org/rpms/golang-gvisor.git /var/lib/mock/f40-build-781874-131892/root/chroot_tmpdir/scmroot/golang-gvisor
Cloning into '/var/lib/mock/f40-build-781874-131892/root/chroot_tmpdir/scmroot/golang-gvisor'...
$ git fetch origin 5ec67b4759ce24d04b285688dc3b107c727f4270:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-gvisor
 * [new ref]         5ec67b4759ce24d04b285688dc3b107c727f4270 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5ec67b4 Rebuild for new golist Fix: rhbz#2033983