op-migrate: automatically create op-node config

op-chain-ops/cmd/op-migrate/main.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"context"
+	"encoding/json"
 	"math/big"
 	"os"
 	"path/filepath"
@@ -90,6 +91,11 @@ func main() {
 				Usage: "LevelDB number of handles",
 				Value: 60,
 			},
+			cli.StringFlag{
+				Name:  "rollup-config-out",
+				Usage: "Path that op-node config will be written to disk",
+				Value: "rollup.json",
+			},
 		},
 		Action: func(ctx *cli.Context) error {
 			deployConfig := ctx.String("deploy-config")
@@ -171,7 +177,17 @@ func main() {
 
 			dryRun := ctx.Bool("dry-run")
 			noCheck := ctx.Bool("no-check")
-			if _, err := genesis.MigrateDB(ldb, config, block, &migrationData, !dryRun, noCheck); err != nil {
+			res, err := genesis.MigrateDB(ldb, config, block, &migrationData, !dryRun, noCheck)
+			if err != nil {
+				return err
+			}
+
+			opNodeConfig, err := config.RollupConfig(block, res.TransitionBlockHash)
+			if err != nil {
+				return err
+			}
+
+			if err := writeJSON(ctx.String("rollup-config-out"), opNodeConfig); err != nil {
 				return err
 			}
 
@@ -183,3 +199,15 @@ func main() {
 		log.Crit("error in migration", "err", err)
 	}
 }
+
+func writeJSON(outfile string, input interface{}) error {
+	f, err := os.OpenFile(outfile, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0o755)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	enc := json.NewEncoder(f)
+	enc.SetIndent("", "  ")
+	return enc.Encode(input)
+}

op-chain-ops/genesis/config.go

@@ -10,7 +10,6 @@ import (
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/common/hexutil"
-	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/log"
 	"github.com/ethereum/go-ethereum/rpc"
@@ -270,8 +269,9 @@ func (d *DeployConfig) InitDeveloperDeployedAddresses() error {
 	return nil
 }
 
+// TODO: convert the input to this function
 // RollupConfig converts a DeployConfig to a rollup.Config
-func (d *DeployConfig) RollupConfig(l1StartBlock *types.Block, l2Genesis *core.Genesis) (*rollup.Config, error) {
+func (d *DeployConfig) RollupConfig(l1StartBlock *types.Block, l2GenesisBlockHash common.Hash) (*rollup.Config, error) {
 	if d.OptimismPortalProxy == (common.Address{}) {
 		return nil, errors.New("OptimismPortalProxy cannot be address(0)")
 	}
@@ -286,7 +286,7 @@ func (d *DeployConfig) RollupConfig(l1StartBlock *types.Block, l2Genesis *core.G
 				Number: l1StartBlock.NumberU64(),
 			},
 			L2: eth.BlockID{
-				Hash:   l2Genesis.ToBlock().Hash(),
+				Hash:   l2GenesisBlockHash,
 				Number: 0,
 			},
 			L2Time: l1StartBlock.Time(),

op-node/cmd/genesis/cmd.go

@@ -67,7 +67,7 @@ var Subcommands = cli.Commands{
 				return err
 			}
 
-			rollupConfig, err := config.RollupConfig(l1StartBlock, l2Genesis)
+			rollupConfig, err := config.RollupConfig(l1StartBlock, l2Genesis.ToBlock().Hash())
 			if err != nil {
 				return err
 			}
@@ -155,7 +155,7 @@ var Subcommands = cli.Commands{
 				return fmt.Errorf("error creating l2 developer genesis: %w", err)
 			}
 
-			rollupConfig, err := config.RollupConfig(l1StartBlock, l2Genesis)
+			rollupConfig, err := config.RollupConfig(l1StartBlock, l2Genesis.ToBlock().Hash())
 			if err != nil {
 				return err
 			}