Implement runtime version checks in set_code (#4548)

* Implement runtime version checks in `set_code`

Check that the new runtime code given to `set_code` fullfills some
requirements:

- `spec_name` matches
- `spec_version` does not decreases
- `impl_version` does not decreases
- Either `spec_version` and `impl_version` increase

* Make tests almost work

* Some fixes after master merge

* Fix tests

* Add missed file

* Make depedency check happy?

* Remove leftover `sc-executor`

* AHHHHH

* Reset debug stuff

* Remove some 'static

* More 'static

* Some docs

* Update `Cargo.lock`

substrate/primitives/io/src/lib.rs

@@ -35,7 +35,7 @@ use sp_std::ops::Deref;
 #[cfg(feature = "std")]
 use sp_core::{
 	crypto::Pair,
-	traits::KeystoreExt,
+	traits::{KeystoreExt, CallInWasmExt},
 	offchain::{OffchainExt, TransactionPoolExt},
 	hexdisplay::HexDisplay,
 	storage::{ChildStorageKey, ChildInfo},
@@ -49,7 +49,7 @@ use sp_core::{
 };
 
 #[cfg(feature = "std")]
-use ::sp_trie::{TrieConfiguration, trie_types::Layout};
+use sp_trie::{TrieConfiguration, trie_types::Layout};
 
 use sp_runtime_interface::{runtime_interface, Pointer};
 
@@ -351,6 +351,25 @@ pub trait Misc {
 	fn print_hex(data: &[u8]) {
 		log::debug!(target: "runtime", "{}", HexDisplay::from(&data));
 	}
+
+	/// Extract the runtime version of the given wasm blob by calling `Core_version`.
+	///
+	/// Returns the SCALE encoded runtime version and `None` if the call failed.
+	///
+	/// # Performance
+	///
+	/// Calling this function is very expensive and should only be done very occasionally.
+	/// For getting the runtime version, it requires instantiating the wasm blob and calling a
+	/// function in this blob.
+	fn runtime_version(&mut self, wasm: &[u8]) -> Option<Vec<u8>> {
+		// Create some dummy externalities, `Core_version` should not write data anyway.
+		let mut ext = sp_state_machine::BasicExternalities::default();
+
+		self.extension::<CallInWasmExt>()
+			.expect("No `CallInWasmExt` associated for the current context!")
+			.call_in_wasm(wasm, "Core_version", &[], &mut ext)
+			.ok()
+	}
 }
 
 /// Interfaces for working with crypto related types from within the runtime.