$ git clone -n https://src.fedoraproject.org/rpms/golang-goftp-server.git /var/lib/mock/f40-build-2002677-44746/root/chroot_tmpdir/scmroot/golang-goftp-server
Cloning into '/var/lib/mock/f40-build-2002677-44746/root/chroot_tmpdir/scmroot/golang-goftp-server'...
$ git fetch origin 3f97b6d6af74c2bc8206cf67e2e787eb69779cf0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-goftp-server
 * [new ref]         3f97b6d6af74c2bc8206cf67e2e787eb69779cf0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3f97b6d Fix version string