$ git clone -n https://src.fedoraproject.org/rpms/golang-gopkg-redis-6.git /var/lib/mock/f41-build-1036610-18741/root/chroot_tmpdir/scmroot/golang-gopkg-redis-6
Cloning into '/var/lib/mock/f41-build-1036610-18741/root/chroot_tmpdir/scmroot/golang-gopkg-redis-6'...
$ git fetch origin 4f948962b44b0f892d8ba686627a811ca37d12d7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-gopkg-redis-6
 * [new ref]         4f948962b44b0f892d8ba686627a811ca37d12d7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4f94896 Fix FTBFS