fix

cmd/geth/chaincmd.go

@@ -61,7 +61,6 @@ It expects the genesis file as argument.`,
 		Usage:     "Dumps genesis block JSON configuration to stdout",
 		ArgsUsage: "",
 		Flags:     append([]cli.Flag{utils.DataDirFlag}, utils.NetworkFlags...),
-		Category:  "BLOCKCHAIN COMMANDS",
 		Description: `
 The dumpgenesis command prints the genesis configuration of the network preset
 if one is set.  Otherwise it prints the genesis from the datadir.`,

cmd/utils/flags.go

@@ -982,9 +982,7 @@ var (
 		KilnFlag,
 	}
 	// NetworkFlags is the flag group of all built-in supported networks.
-	NetworkFlags = append([]cli.Flag{
-		MainnetFlag,
-	}, TestnetFlags...)
+	NetworkFlags = append([]cli.Flag{MainnetFlag}, TestnetFlags...)
 
 	// DatabasePathFlags is the flag group of all database path flags.
 	DatabasePathFlags = []cli.Flag{
@@ -2135,14 +2133,12 @@ func MakeChainDatabase(ctx *cli.Context, stack *node.Node, readonly bool) ethdb.
 }
 
 func IsNetworkPreset(ctx *cli.Context) bool {
-	for _, flag := range TestnetFlags {
-		if ctx.Bool(flag.String()) {
+	for _, flag := range NetworkFlags {
+		bFlag, _ := flag.(*cli.BoolFlag)
+		if ctx.IsSet(bFlag.Name) {
 			return true
 		}
 	}
-	if ctx.Bool(MainnetFlag.Name) {
-		return true
-	}
 	return false
 }