Chain id and netork id flags (#6894)

* added network-id and chain-id flags
* updated usage.go to include new flags
* Merge pull request #1 from prysmaticlabs/master

rebase with master
* gofmt
* Merge branch 'ChainID-and-NetorkID-flags' of github.com:ncitron/prysm into ChainID-and-NetorkID-flags

beacon-chain/flags/base.go

@@ -139,4 +139,14 @@ var (
 		Name:  "historical-slasher-node",
 		Usage: "Enables required flags for serving historical data to a slasher client. Results in additional storage usage",
 	}
+	// ChainID defines a flag to set the chain id. If none is set, it derives this value from NetworkConfig
+	ChainID = &cli.Uint64Flag{
+		Name:  "chain-id",
+		Usage: "Sets the chain id of the beacon chain",
+	}
+	// NetworkID defines a flag to set the network id. If none is set, it derives this value from NetworkConfig
+	NetworkID = &cli.Uint64Flag{
+		Name:  "network-id",
+		Usage: "Sets the network id of the beacon chain.",
+	}
 )

beacon-chain/main.go

@@ -50,6 +50,8 @@ var appFlags = []cli.Flag{
 	flags.SlotsPerArchivedPoint,
 	flags.EnableDebugRPCEndpoints,
 	flags.HistoricalSlasherNode,
+	flags.ChainID,
+	flags.NetworkID,
 	cmd.MinimalConfigFlag,
 	cmd.E2EConfigFlag,
 	cmd.RPCMaxPageSizeFlag,

beacon-chain/node/node.go

@@ -138,6 +138,16 @@ func NewBeaconNode(cliCtx *cli.Context) (*BeaconNode, error) {
 		networkCfg.ContractDeploymentBlock = uint64(cliCtx.Int(flags.ContractDeploymentBlock.Name))
 		params.OverrideBeaconNetworkConfig(networkCfg)
 	}
+	if cliCtx.IsSet(flags.ChainID.Name) {
+		c := params.BeaconNetworkConfig()
+		c.ChainID = cliCtx.Uint64(flags.ChainID.Name)
+		params.OverrideBeaconNetworkConfig(c)
+	}
+	if cliCtx.IsSet(flags.NetworkID.Name) {
+		c := params.BeaconNetworkConfig()
+		c.NetworkID = cliCtx.Uint64(flags.NetworkID.Name)
+		params.OverrideBeaconNetworkConfig(c)
+	}
 
 	registry := shared.NewServiceRegistry()
 

beacon-chain/usage.go

@@ -106,6 +106,8 @@ var appHelpFlagGroups = []flagGroup{
 			flags.EnableDebugRPCEndpoints,
 			flags.SlotsPerArchivedPoint,
 			flags.HistoricalSlasherNode,
+			flags.ChainID,
+			flags.NetworkID,
 		},
 	},
 	{