$ git clone -n https://src.fedoraproject.org/rpms/golang-gopkg-ns1-2.git /var/lib/mock/f41-build-1036603-18741/root/chroot_tmpdir/scmroot/golang-gopkg-ns1-2
Cloning into '/var/lib/mock/f41-build-1036603-18741/root/chroot_tmpdir/scmroot/golang-gopkg-ns1-2'...
$ git fetch origin 78b75dcd99eac0b00da1e3d42c0cfbef23490318:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-gopkg-ns1-2
 * [new ref]         78b75dcd99eac0b00da1e3d42c0cfbef23490318 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 78b75dc Fix FTBFS