Merge pull request #67 from bladehan1/fea-prevent-snapsync

chg(interface):only support full sync

cmd/geth/main.go

@@ -273,6 +273,12 @@ func main() {
 // prepare manipulates memory cache allowance and setups metric system.
 // This function should be called before launching devp2p stack.
 func prepare(ctx *cli.Context) {
+	//only support full sync
+	err := ctx.Set(utils.SyncModeFlag.Name, "full")
+	if err != nil {
+		log.Warn("Failed to set sync mode to full")
+	}
+
 	// If we're running a known preset, log it for convenience.
 	switch {
 	case ctx.GlobalIsSet(utils.RopstenFlag.Name):

cmd/utils/flags.go

@@ -213,7 +213,7 @@ var (
 	defaultSyncMode = ethconfig.Defaults.SyncMode
 	SyncModeFlag    = TextMarshalerFlag{
 		Name:  "syncmode",
-		Usage: `Blockchain sync mode ("fast", "full", "snap" or "light")`,
+		Usage: `Blockchain sync mode (only "full" sync supported)`,
 		Value: &defaultSyncMode,
 	}
 	GCModeFlag = cli.StringFlag{

eth/ethconfig/config.go

@@ -63,7 +63,7 @@ var LightClientGPO = gasprice.Config{
 
 // Defaults contains default settings for use on the Ethereum main net.
 var Defaults = Config{
-	SyncMode: downloader.SnapSync,
+	SyncMode: downloader.FullSync,
 	Ethash: ethash.Config{
 		CacheDir:         "ethash",
 		CachesInMem:      2,