cmd/hivechain: put back difficulty-only forks

This reverts commit f01b2d3.

cmd/hivechain/genesis.go

@@ -41,8 +41,8 @@ var (
 		"muirglacier",
 		"berlin",
 		"london",
-		// "arrowglacier", "grayglacier" forks were difficulty bomb changes. They are not
-		// available here because hive doesn't support configuring them on clients.
+		"arrowglacier",
+		"grayglacier",
 		"merge",
 	}
 
@@ -98,6 +98,10 @@ func (cfg *generatorConfig) createChainConfig() *params.ChainConfig {
 			chaincfg.BerlinBlock = new(big.Int).SetUint64(b)
 		case "london":
 			chaincfg.LondonBlock = new(big.Int).SetUint64(b)
+		case "arrowglacier":
+			chaincfg.ArrowGlacierBlock = new(big.Int).SetUint64(b)
+		case "grayglacier":
+			chaincfg.GrayGlacierBlock = new(big.Int).SetUint64(b)
 		case "merge":
 			chaincfg.MergeNetsplitBlock = new(big.Int).SetUint64(b)
 			chaincfg.TerminalTotalDifficultyPassed = true

cmd/hivechain/output_forkenv.go

@@ -38,6 +38,8 @@ func (g *generator) writeForkEnv() error {
 	setNum("HIVE_FORK_PETERSBURG", cfg.PetersburgBlock)
 	setNum("HIVE_FORK_ISTANBUL", cfg.IstanbulBlock)
 	setNum("HIVE_FORK_MUIR_GLACIER", cfg.MuirGlacierBlock)
+	setNum("HIVE_FORK_ARROW_GLACIER", cfg.ArrowGlacierBlock)
+	setNum("HIVE_FORK_GRAY_GLACIER", cfg.GrayGlacierBlock)
 	setNum("HIVE_FORK_BERLIN", cfg.BerlinBlock)
 	setNum("HIVE_FORK_LONDON", cfg.LondonBlock)
 	setNum("HIVE_MERGE_BLOCK_ID", cfg.MergeNetsplitBlock)