Fix the can-author issue by defaulting to Kusama when no chainspec given. (#728)

* Fix can_author by defaulting correctly.

* Comments

* Better logging

* Bump Substrate

* Minor updates to readme.

polkadot/README.md

@@ -9,13 +9,13 @@ Implementation of a https://polkadot.network node in Rust.
 
 ## NOTE
 
-In 2017 we split our implementation of "Polkadot" from its platform-level component "Substrate". When we split them, we split the Polkadot code off into another repo (this repo), leaving the [**Substrate** repo][substrate-repo] to be what used to be Polkadot, along with its branches and releases.
+In 2018 we split our implementation of "Polkadot" from its platform-level component "Substrate". When we split them, we split the Polkadot code off into another repo (this repo), leaving the [**Substrate** repo][substrate-repo] to be what used to be Polkadot, along with its branches and releases.
 
 We are actively building both Substrate and Polkadot, but things will be a little odd for a while.  If you see "substrate" and are wondering why you need it for Polkadot, now you know.
 
 To connect on the "Kusama" canary network, you will want the `v0.7` code, which is in this **Polkadot** repo. To play on the ("Alexander") testnet, you'll want the PoC-4 code instead.  Note that PoC-3 uses the Alexander testnet, but will not be able to sync to the latest block.
 
-* **Kusama CC-3** is in this [**Polkadot**] repo `master` branch.
+* **Kusama** (né Kusama CC-3) is in this [**Polkadot**] repo `master` branch.
 
 * **Kusama CC-2** is in this [**Polkadot**][polkadot-v0.6] repo branch `v0.6`.
 

polkadot/cli/src/lib.rs

@@ -76,11 +76,14 @@ pub fn run<E: IntoExit>(exit: E, version: cli::VersionInfo) -> error::Result<()>
 		"parity-polkadot",
 		std::env::args(),
 	);
+
+	// TODO: Use `IsKusama` trait. #727
 	if cmd
 		.shared_params()
 		.and_then(|p| p.chain.as_ref())
-		.and_then(|c| ChainSpec::from(c))
-		.map_or(false, |c| c.is_kusama())
+		.map_or(true, |p| ChainSpec::from(&p)
+			.map_or(false, |c| c.is_kusama())
+		)
 	{
 		execute_cmd_with_runtime::<
 			service::kusama_runtime::RuntimeApi,
@@ -120,7 +123,7 @@ where
 				info!("{}", version.name);
 				info!("  version {}", config.full_version());
 				info!("  by {}, 2017-2019", version.author);
-				info!("Chain specification: {}", config.chain_spec.name());
+				info!("Chain specification: {} (native: {})", config.chain_spec.name(), D::native_version().runtime_version);
 				if config.is_kusama() {
 					info!("----------------------------");
 					info!("This chain is not in any way");