Rename TestEnableDevelopmentHardForkEras

TestEnableDevelopmentHardForkEras has been renamed to
TestEnableDevelopmentProtVer. An error is thrown if
TestEnableDevelopmentHardForkEras is used to avoid it silently being set
to False.

Closes #4043

Author: Robert 'Probie' Offner

Diff for: cardano-node/src/Cardano/Node/Configuration/POM.hs

@@ -51,6 +51,17 @@ import qualified Ouroboros.Consensus.Node as Consensus (NetworkP2PMode (..))
 import           Ouroboros.Consensus.Storage.LedgerDB.DiskPolicy (SnapshotInterval (..))
 import           Ouroboros.Network.NodeToNode (AcceptedConnectionsLimit (..), DiffusionMode (..))
 
+-- Since we ignore unknown fields, if we've explictly removed or renamed
+-- a field we should error out so that a user isn't surprised when they
+-- upgrade.
+data RemovedField = RemovedField { rfField :: Key, rfErr :: String }
+  deriving Show
+
+failOnRemovedFields :: Aeson.Object -> [RemovedField] -> Aeson.Parser ()
+failOnRemovedFields obj = mapM_ $ \(RemovedField field err) -> do
+  mVal :: Maybe Aeson.Value <- obj .:? field
+  when (isJust mVal) $ fail err
+
 data NetworkP2PMode = EnabledP2PMode | DisabledP2PMode
   deriving (Eq, Show, Generic)
 
@@ -374,8 +385,16 @@ instance FromJSON PartialNodeConfiguration where
              }
 
       parseHardForkProtocol v = do
-        npcTestEnableDevelopmentHardForkEras
-          <- v .:? "TestEnableDevelopmentHardForkEras"
+
+        failOnRemovedFields v
+          [ RemovedField
+              { rfField = "TestEnableDevelopmentHardForkEras"
+              , rfErr = "TestEnableDevelopmentHardForkEras has been renamed to TestEnableAdvertiseDevelopmentProtVer"
+              }
+          ]
+
+        npcTestEnableAdvertiseDevelopmentProtVer
+          <- v .:? "TestEnableAdvertiseDevelopmentProtVer"
                .!= False
 
         npcTestShelleyHardForkAtEpoch   <- v .:? "TestShelleyHardForkAtEpoch"
@@ -394,7 +413,7 @@ instance FromJSON PartialNodeConfiguration where
         npcTestBabbageHardForkAtVersion <- v .:? "TestBabbageHardForkAtVersion"
 
         pure NodeHardForkProtocolConfiguration {
-               npcTestEnableDevelopmentHardForkEras,
+               npcTestEnableAdvertiseDevelopmentProtVer,
 
                npcTestShelleyHardForkAtEpoch,
                npcTestShelleyHardForkAtVersion,

Diff for: cardano-node/src/Cardano/Node/Protocol/Cardano.hs

@@ -85,12 +85,6 @@ mkSomeConsensusProtocolCardano NodeByronProtocolConfiguration {
                              npcAlonzoGenesisFileHash
                            }
                            NodeHardForkProtocolConfiguration {
-                            -- npcTestEnableDevelopmentHardForkEras,
-                            -- During testing of the Alonzo era, we conditionally declared that we
-                            -- knew about the Alonzo era. We do so only when a config option for
-                            -- testing development/unstable eras is used. This lets us include
-                            -- not-yet-ready eras in released node versions without mainnet nodes
-                            -- prematurely advertising that they could hard fork into the new era.
                              npcTestShelleyHardForkAtEpoch,
                              npcTestShelleyHardForkAtVersion,
                              npcTestAllegraHardForkAtEpoch,

Diff for: cardano-node/src/Cardano/Node/Types.hs

@@ -188,7 +188,7 @@ data NodeHardForkProtocolConfiguration =
        -- This flag should be set to true for nodes taking part in testnets for
        -- testing the new era.
        --
-       npcTestEnableDevelopmentHardForkEras :: Bool
+       npcTestEnableAdvertiseDevelopmentProtVer :: Bool
 
        -- | For testing purposes we support specifying that the hard fork
        -- happens at an exact epoch number (ie the first epoch of the new era).

Diff for: cardano-testnet/src/Testnet/Babbage.hs

@@ -168,7 +168,7 @@ testnet testnetOptions H.Conf {..} = do
     . HM.insert "TestMaryHardForkAtEpoch" (toJSON @Int 0)
     . HM.insert "TestAlonzoHardForkAtEpoch" (toJSON @Int 0)
     . HM.insert "TestBabbageHardForkAtEpoch" (toJSON @Int 0)
-    . HM.insert "TestEnableDevelopmentHardForkEras" (toJSON True)
+    . HM.insert "TestEnableAdvertiseDevelopmentProtVer" (toJSON True)
     . flip HM.alter "setupScribes"
         ( fmap
           . J.rewriteArrayElements

Diff for: cardano-testnet/src/Testnet/Cardano.hs

@@ -246,7 +246,7 @@ testnet testnetOptions H.Conf {..} = do
     . HM.insert "LastKnownBlockVersion-Minor" (J.toJSON @Int 0)
     . HM.insert "TraceBlockchainTime" (J.toJSON True)
     . HM.delete "GenesisFile"
-    . HM.insert "TestEnableDevelopmentHardForkEras" (J.toJSON @Bool True)
+    . HM.insert "TestEnableAdvertiseDevelopmentProtVer" (J.toJSON @Bool True)
     . HM.insert "EnableP2P" (J.toJSON @Bool (enableP2P testnetOptions))
     . flip HM.alter "setupScribes"
         ( fmap