make deployment phase configurable (#4231)

Allow config of deployment phase via config instead of attempting to
derive from genesis content (when running relevant testnets), so that
we don't have to keep maintaining the list inside the binary.

beacon_chain/conf.nim

@@ -113,6 +113,12 @@ type
     # migrateAll = "Export and remove the whole validator slashing protection DB."
     # migrate = "Export and remove specified validators from Nimbus."
 
+  DeploymentPhase* {.pure.} = enum
+    Devnet = "devnet"
+    Testnet = "testnet"
+    Mainnet = "mainnet"
+    None = "none"
+
   BeaconNodeConf* = object
     configFile* {.
       desc: "Loads the configuration from a TOML file"
@@ -515,6 +521,13 @@ type
         defaultValueDesc: "50"
         name: "sync-horizon" .}: uint64
 
+      deploymentPhase* {.
+        hidden
+        desc: "Configures the deployment phase"
+        defaultValue: DeploymentPhase.Mainnet
+        defaultValueDesc: $DeploymentPhase.Mainnet
+        name: "deployment-phase" .}: DeploymentPhase
+
       # TODO nim-confutils on 32-bit platforms overflows decoding integers
       # requiring 64-bit representations and doesn't build when specifying
       # UInt256 directly, so pass this through for decoding elsewhere.

beacon_chain/networking/network_metadata.nim

@@ -79,15 +79,6 @@ type
     else:
       incompatibilityDesc*: string
 
-type DeploymentPhase* {.pure.} = enum
-  None,
-  Devnet,
-  Testnet,
-  Mainnet
-
-func deploymentPhase*(genesisData: string): DeploymentPhase =
-  DeploymentPhase.Devnet
-
 const
   eth2NetworksDir = currentSourcePath.parentDir.replace('\\', '/') & "/../../vendor/eth2-networks"
   mergeTestnetsDir = currentSourcePath.parentDir.replace('\\', '/') & "/../../vendor/merge-testnets"

beacon_chain/nimbus_beacon_node.nim

@@ -624,7 +624,7 @@ proc init*(T: type BeaconNode,
     dag = loadChainDag(
       config, cfg, db, eventBus,
       validatorMonitor, networkGenesisValidatorsRoot,
-      genesisStateContents.deploymentPhase <= DeploymentPhase.Testnet)
+      config.deploymentPhase <= DeploymentPhase.Testnet)
     genesisTime = getStateField(dag.headState, genesis_time)
     beaconClock = BeaconClock.init(genesisTime)
     getBeaconTime = beaconClock.getBeaconTimeFn()