--geth compatibility option

parity/cli.rs

@@ -136,6 +136,9 @@ Footprint Options:
                            options.
 
 Legacy Options:
+  --geth                   Run in Geth-compatibility mode. Currently just sets
+                           the IPC path to be the same as Geth's. Overrides
+                           the --ipc-path/--ipcpath options.
   --datadir PATH           Equivalent to --db-path PATH.
   --testnet                Equivalent to --chain testnet.
   --networkid INDEX        Equivalent to --network-id INDEX.
@@ -214,6 +217,7 @@ pub struct Args {
 	pub flag_logging: Option<String>,
 	pub flag_version: bool,
 	// legacy...
+	pub flag_geth: bool,
 	pub flag_nodekey: Option<String>,
 	pub flag_nodiscover: bool,
 	pub flag_maxpeers: Option<usize>,

parity/configuration.rs

@@ -270,7 +270,7 @@ impl Configuration {
 	pub fn ipc_settings(&self) -> IpcConfiguration {
 		IpcConfiguration {
 			enabled: !(self.args.flag_ipcdisable || self.args.flag_ipc_off),
-			socket_addr: self.args.flag_ipcpath.clone().unwrap_or(self.args.flag_ipc_path.clone())
+			socket_addr: if self.args.flag_geth { "$HOME/.ethereum/geth.ipc".to_owned() } else { self.args.flag_ipcpath.clone().unwrap_or(self.args.flag_ipc_path.clone()) }
 				.replace("$HOME", env::home_dir().unwrap().to_str().unwrap()),
 			apis: self.args.flag_ipcapi.clone().unwrap_or(self.args.flag_ipc_apis.clone()),
 		}