$ git clone -n https://src.fedoraproject.org/rpms/transmission.git /var/lib/mock/f40-build-761651-121633/root/chroot_tmpdir/scmroot/transmission
Cloning into '/var/lib/mock/f40-build-761651-121633/root/chroot_tmpdir/scmroot/transmission'...
$ git fetch origin 0c135d5baabe60db3dd02a49d9a6b2ab2efd4ef2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/transmission
 * [new ref]         0c135d5baabe60db3dd02a49d9a6b2ab2efd4ef2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0c135d5 4.0.5