Merge pull request #4139 from ethereum-optimism/fixes/op-migrate

op-migrate: various sanity checks + cleanup

op-chain-ops/genesis/db_migration.go

@@ -120,6 +120,9 @@ func MigrateDB(ldb ethdb.Database, config *DeployConfig, l1Block *types.Block, m
 	}
 	log.Info("Completed ERC20 ETH migration", "root", newRoot)
 
+	// Set the amount of gas used so that EIP 1559 starts off stable
+	gasUsed := (uint64)(config.L2GenesisBlockGasLimit) * config.EIP1559Elasticity
+
 	// Create the bedrock transition block
 	bedrockHeader := &types.Header{
 		ParentHash:  header.Hash(),
@@ -132,16 +135,25 @@ func MigrateDB(ldb ethdb.Database, config *DeployConfig, l1Block *types.Block, m
 		Difficulty:  common.Big0,
 		Number:      new(big.Int).Add(header.Number, common.Big1),
 		GasLimit:    (uint64)(config.L2GenesisBlockGasLimit),
-		GasUsed:     0,
+		GasUsed:     gasUsed,
 		Time:        uint64(config.L2OutputOracleStartingTimestamp),
 		Extra:       bedrockTransitionBlockExtraData,
 		MixDigest:   common.Hash{},
 		Nonce:       types.BlockNonce{},
-		BaseFee:     (*big.Int)(config.L2GenesisBlockBaseFeePerGas),
+		BaseFee:     big.NewInt(params.InitialBaseFee),
 	}
 
 	bedrockBlock := types.NewBlock(bedrockHeader, nil, nil, nil, trie.NewStackTrie(nil))
 
+	log.Info(
+		"Built Bedrock transition",
+		"hash", bedrockBlock.Hash(),
+		"root", bedrockBlock.Root(),
+		"number", bedrockBlock.NumberU64(),
+		"gas-used", bedrockBlock.GasUsed(),
+		"gas-limit", bedrockBlock.GasLimit(),
+	)
+
 	res := &MigrationResult{
 		TransitionHeight:    bedrockBlock.NumberU64(),
 		TransitionTimestamp: bedrockBlock.Time(),
@@ -183,6 +195,12 @@ func MigrateDB(ldb ethdb.Database, config *DeployConfig, l1Block *types.Block, m
 	}
 	rawdb.WriteChainConfig(ldb, genesisHash, cfg)
 
+	log.Info(
+		"wrote chain config",
+		"1559-denominator", config.EIP1559Denominator,
+		"1559-elasticity", config.EIP1559Elasticity,
+	)
+
 	log.Info(
 		"wrote Bedrock transition block",
 		"height", bedrockHeader.Number,