$ git clone -n https://src.fedoraproject.org/rpms/golang-gopkg-redis-6.git /var/lib/mock/f40-build-2246367-53808/root/chroot_tmpdir/scmroot/golang-gopkg-redis-6
Cloning into '/var/lib/mock/f40-build-2246367-53808/root/chroot_tmpdir/scmroot/golang-gopkg-redis-6'...
$ git fetch origin 4d9d5436f58cbcc66c93bee512e6326b16e9de17:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-gopkg-redis-6
 * [new ref]         4d9d5436f58cbcc66c93bee512e6326b16e9de17 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4d9d543 Remove deprecated %patchN syntax