$ git clone -n https://src.fedoraproject.org/rpms/golang-gopkg-pipe-2.git /var/lib/mock/f41-build-1036615-18741/root/chroot_tmpdir/scmroot/golang-gopkg-pipe-2
Cloning into '/var/lib/mock/f41-build-1036615-18741/root/chroot_tmpdir/scmroot/golang-gopkg-pipe-2'...
$ git fetch origin 0a9abff7ef1ca6913ebd45f7453c228a177ad8fb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-gopkg-pipe-2
 * [new ref]         0a9abff7ef1ca6913ebd45f7453c228a177ad8fb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0a9abff Fix FTBFS