feat: add chainId option

args.js

@@ -146,6 +146,13 @@ module.exports = exports = function(yargs, version, isDocker) {
  defaultDescription: "System time at process start or Network ID of forked blockchain if configured.",
  demandOption: false
  })
+ .option('chainId', {
+ group: 'Chain:',
+ type: 'number',
+ describe: "The Chain ID ganache-cli will use for `eth_chainId` RPC and the `CHAINID` opcode.",
+ defaultDescription: "For legacy reasons, the default is currently `1337` for `eth_chainId` RPC and `1` for the `CHAINID` opcode. This will be fixed in the next major version of ganache-cli and ganache-core!",
+ demandOption: false
+ })
  .option('g', {
  group: 'Chain:',
  alias: 'gasPrice',

cli.js

@@ -97,7 +97,10 @@ var options = {
  logger: logger,
  allowUnlimitedContractSize: argv.allowUnlimitedContractSize,
  time: argv.t,
- keepAliveTimeout: argv.keepAliveTimeout
+ keepAliveTimeout: argv.keepAliveTimeout,
+ _chainId: argv.chainId,
+ // gross!
+ _chainIdRpc: argv.chainId
 }
 
 var server = ganache.server(options);