$ git clone -n https://src.fedoraproject.org/rpms/golang-github-docker.git /var/lib/mock/f41-build-839100-15167/root/chroot_tmpdir/scmroot/golang-github-docker
Cloning into '/var/lib/mock/f41-build-839100-15167/root/chroot_tmpdir/scmroot/golang-github-docker'...
$ git fetch origin 7c704f57956135368325a9cbf286c2be4e5948f4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-docker
 * [new ref]         7c704f57956135368325a9cbf286c2be4e5948f4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7c704f5 Fix FTBFS