$ git clone -n https://src.fedoraproject.org/rpms/golang-github-google-replayers.git /var/lib/mock/f40-build-2218492-52601/root/chroot_tmpdir/scmroot/golang-github-google-replayers
Cloning into '/var/lib/mock/f40-build-2218492-52601/root/chroot_tmpdir/scmroot/golang-github-google-replayers'...
$ git fetch origin 6b03c2398d3392d8829567716b8653349326a72f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-google-replayers
 * [new ref]         6b03c2398d3392d8829567716b8653349326a72f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6b03c23 Disable build-time checks that rely on golang-github-google-martian