Provide CLI options to disable aspects of soft-fork.

Soft-fork will remain default behaviour, but you can now disable
either the whole mechanism (you'll lose money if you mine with this
when the majority network doesn't) or just vote against it but
otherwise go with the flow.

ethcore/res/ethereum/frontier.json

@@ -9,7 +9,8 @@
 				"durationLimit": "0x0d",
 				"blockReward": "0x4563918244F40000",
 				"registrar" : "0xc6d9d2cd449a754c494264e1809c50e34d64562b",
-				"frontierCompatibilityModeLimit": "0x118c30"
+				"frontierCompatibilityModeLimit": "0x118c30",
+				"daoRescueSoftFork": false
 			}
 		}
 	},

ethcore/src/ethereum/ethash.rs

@@ -41,6 +41,8 @@ pub struct EthashParams {
 	pub registrar: Address,
 	/// Homestead transition block number.
 	pub frontier_compatibility_mode_limit: u64,
+	/// Enable the soft-fork logic.
+	pub dao_rescue_soft_fork: bool,
 }
 
 impl From<ethjson::spec::EthashParams> for EthashParams {
@@ -53,6 +55,7 @@ impl From<ethjson::spec::EthashParams> for EthashParams {
 			block_reward: p.block_reward.into(),
 			registrar: p.registrar.into(),
 			frontier_compatibility_mode_limit: p.frontier_compatibility_mode_limit.into(),
+			dao_rescue_soft_fork: p.dao_rescue_soft_fork.into(),
 		}
 	}
 }
@@ -102,7 +105,9 @@ impl Engine for Ethash {
 			Schedule::new_frontier()
 		} else {
 			let mut s = Schedule::new_homestead();
-			s.reject_dao_transactions = env_info.dao_rescue_block_gas_limit.map(|x| x <= 4_000_000.into()).unwrap_or(false);
+			if self.ethash_params.dao_rescue_soft_fork {
+				s.reject_dao_transactions = env_info.dao_rescue_block_gas_limit.map(|x| x <= 4_000_000.into()).unwrap_or(false);
+			}
 			s
 		}
 	}

ethcore/src/ethereum/mod.rs

@@ -33,7 +33,12 @@ use super::spec::*;
 pub fn new_olympic() -> Spec { Spec::load(include_bytes!("../../res/ethereum/olympic.json")) }
 
 /// Create a new Frontier mainnet chain spec.
-pub fn new_frontier() -> Spec { Spec::load(include_bytes!("../../res/ethereum/frontier.json")) }
+pub fn new_frontier(dao_rescue: bool) -> Spec {
+	Spec::load(match dao_rescue {
+		true => include_bytes!("../../res/ethereum/frontier_dao_rescue.json"),
+		false => include_bytes!("../../res/ethereum/frontier.json"),
+	})
+}
 
 /// Create a new Frontier chain spec as though it never changes to Homestead.
 pub fn new_frontier_test() -> Spec { Spec::load(include_bytes!("../../res/ethereum/frontier_test.json")) }
@@ -84,7 +89,7 @@ mod tests {
 
 	#[test]
 	fn frontier() {
-		let frontier = new_frontier();
+		let frontier = new_frontier(true);
 
 		assert_eq!(frontier.state_root(), H256::from_str("d7f8974fb5ac78d9ac099b9ad5018bedc2ce0a72dad1827a1709da30580f0544").unwrap());
 		let genesis = frontier.genesis_block();

json/src/spec/ethash.rs

@@ -42,6 +42,9 @@ pub struct EthashParams {
 	/// Homestead transition block number.
 	#[serde(rename="frontierCompatibilityModeLimit")]
 	pub frontier_compatibility_mode_limit: Uint,
+	/// DAO rescue soft-fork?
+	#[serde(rename="daoRescueSoftFork")]
+	pub dao_rescue_soft_fork: bool,
 }
 
 /// Ethash engine deserialization.
@@ -65,8 +68,9 @@ mod tests {
 				"difficultyBoundDivisor": "0x0800",
 				"durationLimit": "0x0d",
 				"blockReward": "0x4563918244F40000",
-				"registrar" : "0xc6d9d2cd449a754c494264e1809c50e34d64562b",
-				"frontierCompatibilityModeLimit" : "0x42"
+				"registrar": "0xc6d9d2cd449a754c494264e1809c50e34d64562b",
+				"frontierCompatibilityModeLimit": "0x42",
+				"daoRescueSoftFork": true
 			}
 		}"#;
 

parity/cli.rs

@@ -42,6 +42,14 @@ Protocol Options:
                            [default: $HOME/.parity/keys].
   --identity NAME          Specify your node's name.
 
+DAO-Rescue Soft-fork Options:
+  --rescue-my-ether        Does nothing - on by default.
+  --assist-dao-attack      Votes against the DAO-rescue soft-fork, but supports
+                           it if it is triggered anyway.
+                           Equivalent to --gas-floor-target=3141592.
+  --dogmatic               Ignores all DAO-rescue soft-fork behaviour. Even if
+                           it means losing mining rewards.
+
 Account Options:
   --unlock ACCOUNTS        Unlock ACCOUNTS for the duration of the execution.
                            ACCOUNTS is a comma-delimited list of addresses.
@@ -220,6 +228,8 @@ pub struct Args {
 	pub flag_chain: String,
 	pub flag_db_path: String,
 	pub flag_identity: String,
+	pub flag_assist_dao_attack: bool,
+	pub flag_dogmatic: bool,
 	pub flag_unlock: Option<String>,
 	pub flag_password: Vec<String>,
 	pub flag_cache: Option<usize>,

parity/configuration.rs

@@ -75,12 +75,18 @@ impl Configuration {
 	}
 
 	pub fn gas_floor_target(&self) -> U256 {
-		let d = &self.args.flag_gas_floor_target;
-		U256::from_dec_str(d).unwrap_or_else(|_| {
-			die!("{}: Invalid target gas floor given. Must be a decimal unsigned 256-bit number.", d)
-		})
+		if self.args.flag_assist_dao_attack || self.args.flag_dogmatic {
+			4_700_000.into()
+		} else {
+			let d = &self.args.flag_gas_floor_target;
+			U256::from_dec_str(d).unwrap_or_else(|_| {
+				die!("{}: Invalid target gas floor given. Must be a decimal unsigned 256-bit number.", d)
+			})
+		}
 	}
 
+
+
 	pub fn gas_price(&self) -> U256 {
 		match self.args.flag_gasprice.as_ref() {
 			Some(d) => {
@@ -124,7 +130,7 @@ impl Configuration {
 
 	pub fn spec(&self) -> Spec {
 		match self.chain().as_str() {
-			"frontier" | "homestead" | "mainnet" => ethereum::new_frontier(),
+			"frontier" | "homestead" | "mainnet" => ethereum::new_frontier(!self.args.flag_dogmatic),
 			"morden" | "testnet" => ethereum::new_morden(),
 			"olympic" => ethereum::new_olympic(),
 			f => Spec::load(contents(f).unwrap_or_else(|_| {

sync/src/lib.rs

@@ -44,8 +44,8 @@
 //! 	let mut service = NetworkService::new(NetworkConfiguration::new()).unwrap();
 //! 	service.start().unwrap();
 //! 	let dir = env::temp_dir();
-//! 	let client = Client::new(ClientConfig::default(), ethereum::new_frontier(), &dir, Arc::new(Miner::default()), service.io().channel()).unwrap();
-//! 	let miner = Miner::new(false, ethereum::new_frontier());
+//! 	let client = Client::new(ClientConfig::default(), ethereum::new_frontier(true), &dir, Arc::new(Miner::default()), service.io().channel()).unwrap();
+//! 	let miner = Miner::new(false, ethereum::new_frontier(true));
 //! 	let sync = EthSync::new(SyncConfig::default(), client);
 //! 	EthSync::register(&mut service, sync);
 //! }