From b1cc9cdc7424d452687e2e168027d591ed332f3f Mon Sep 17 00:00:00 2001
From: Gustav Simonsson <gustav.simonsson@gmail.com>
Date: Tue, 5 May 2015 08:24:15 +0200
Subject: Integrate new ethash API and change geth makedag cmd

---
 cmd/geth/main.go   | 34 ++++++++++++++++++++++++++++------
 cmd/utils/flags.go |  2 +-
 2 files changed, 29 insertions(+), 7 deletions(-)

(limited to 'cmd')

diff --git a/cmd/geth/main.go b/cmd/geth/main.go
index e00b139c0..f2497ccf4 100644
--- a/cmd/geth/main.go
+++ b/cmd/geth/main.go
@@ -27,8 +27,10 @@ import (
 	"io/ioutil"
 	"os"
 	"path"
+	"path/filepath"
 	"runtime"
 	"strconv"
+	"strings"
 	"time"
 
 	"github.com/codegangsta/cli"
@@ -601,12 +603,32 @@ func dump(ctx *cli.Context) {
 }
 
 func makedag(ctx *cli.Context) {
-	chain, _, _ := utils.GetChain(ctx)
-	pow := ethash.New(chain)
-	fmt.Println("making cache")
-	pow.UpdateCache(0, true)
-	fmt.Println("making DAG")
-	pow.UpdateDAG()
+	args := ctx.Args()
+	wrongArgs := func() {
+		utils.Fatalf(`Usage: geth makedag <block number> <outputdir>`)
+	}
+	switch {
+	case len(args) == 2:
+		blockNum, err := strconv.ParseUint(args[0], 0, 64)
+		dir := args[1]
+		if err != nil {
+			wrongArgs()
+		} else {
+			dir = filepath.Clean(dir)
+			// seems to require a trailing slash
+			if !strings.HasSuffix(dir, "/") {
+				dir = dir + "/"
+			}
+			_, err = ioutil.ReadDir(dir)
+			if err != nil {
+				utils.Fatalf("Can't find dir")
+			}
+			fmt.Println("making DAG, this could take awhile...")
+			ethash.MakeDAG(blockNum, dir)
+		}
+	default:
+		wrongArgs()
+	}
 }
 
 func version(c *cli.Context) {
diff --git a/cmd/utils/flags.go b/cmd/utils/flags.go
index c013510d8..1fdc8dfe5 100644
--- a/cmd/utils/flags.go
+++ b/cmd/utils/flags.go
@@ -316,7 +316,7 @@ func GetChain(ctx *cli.Context) (*core.ChainManager, common.Database, common.Dat
 
 	eventMux := new(event.TypeMux)
 	chainManager := core.NewChainManager(blockDb, stateDb, eventMux)
-	pow := ethash.New(chainManager)
+	pow := ethash.New()
 	txPool := core.NewTxPool(eventMux, chainManager.State, chainManager.GasLimit)
 	blockProcessor := core.NewBlockProcessor(stateDb, extraDb, pow, txPool, chainManager, eventMux)
 	chainManager.SetProcessor(blockProcessor)
-- 
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