1 files changed, 52 insertions, 0 deletions
diff --git a/cmd/puppeth/wizard_genesis.go b/cmd/puppeth/wizard_genesis.go
index 43dae9c20..222fc2a7c 100644
--- a/cmd/puppeth/wizard_genesis.go
+++ b/cmd/puppeth/wizard_genesis.go
@@ -18,7 +18,9 @@ package main
 
 import (
 	"bytes"
+	"encoding/json"
 	"fmt"
+	"io/ioutil"
 	"math/big"
 	"math/rand"
 	"time"
@@ -135,3 +137,53 @@ func (w *wizard) makeGenesis() {
 	// All done, store the genesis and flush to disk
 	w.conf.genesis = genesis
 }
+
+// manageGenesis permits the modification of chain configuration parameters in
+// a genesis config and the export of the entire genesis spec.
+func (w *wizard) manageGenesis() {
+	// Figure out whether to modify or export the genesis
+	fmt.Println()
+	fmt.Println(" 1. Modify existing fork rules")
+	fmt.Println(" 2. Export genesis configuration")
+
+	choice := w.read()
+	switch {
+	case choice == "1":
+		// Fork rule updating requested, iterate over each fork
+		fmt.Println()
+		fmt.Printf("Which block should Homestead come into effect? (default = %v)\n", w.conf.genesis.Config.HomesteadBlock)
+		w.conf.genesis.Config.HomesteadBlock = w.readDefaultBigInt(w.conf.genesis.Config.HomesteadBlock)
+
+		fmt.Println()
+		fmt.Printf("Which block should EIP150 come into effect? (default = %v)\n", w.conf.genesis.Config.EIP150Block)
+		w.conf.genesis.Config.EIP150Block = w.readDefaultBigInt(w.conf.genesis.Config.EIP150Block)
+
+		fmt.Println()
+		fmt.Printf("Which block should EIP155 come into effect? (default = %v)\n", w.conf.genesis.Config.EIP155Block)
+		w.conf.genesis.Config.EIP155Block = w.readDefaultBigInt(w.conf.genesis.Config.EIP155Block)
+
+		fmt.Println()
+		fmt.Printf("Which block should EIP158 come into effect? (default = %v)\n", w.conf.genesis.Config.EIP158Block)
+		w.conf.genesis.Config.EIP158Block = w.readDefaultBigInt(w.conf.genesis.Config.EIP158Block)
+
+		fmt.Println()
+		fmt.Printf("Which block should Byzantium come into effect? (default = %v)\n", w.conf.genesis.Config.ByzantiumBlock)
+		w.conf.genesis.Config.ByzantiumBlock = w.readDefaultBigInt(w.conf.genesis.Config.ByzantiumBlock)
+
+		out, _ := json.MarshalIndent(w.conf.genesis.Config, "", "  ")
+		fmt.Printf("Chain configuration updated:\n\n%s\n", out)
+
+	case choice == "2":
+		// Save whatever genesis configuration we currently have
+		fmt.Println()
+		fmt.Printf("Which file to save the genesis into? (default = %s.json)\n", w.network)
+		out, _ := json.MarshalIndent(w.conf.genesis, "", "  ")
+		if err := ioutil.WriteFile(w.readDefaultString(fmt.Sprintf("%s.json", w.network)), out, 0644); err != nil {
+			log.Error("Failed to save genesis file", "err", err)
+		}
+		log.Info("Exported existing genesis block")
+
+	default:
+		log.Error("That's not something I can do")
+	}
+}