* cmd/geth: add --nocompaction flag + multiple import files

* main,import: Add --nocompaction flag + multiple import files

* geth/import: documentation

* import: Added more info to err message

* fix :P

cmd/geth/chaincmd.go

@@ -54,10 +54,13 @@ participating.
 		Action:    importChain,
 		Name:      "import",
 		Usage:     "Import a blockchain file",
-		ArgsUsage: "<filename>",
+		ArgsUsage: "<filename> (<filename 2> ... <filename N>) ",
 		Category:  "BLOCKCHAIN COMMANDS",
 		Description: `
-TODO: Please write this
+The import command imports blocks from an RLP-encoded form. The form can be one file 
+with several RLP-encoded blocks, or several files can be used. 
+If only one file is used, import error will result in failure. If several files are used, 
+processing will proceed even if an individual RLP-file import failure occurs.   
 `,
 	}
 	exportCommand = cli.Command{
@@ -122,7 +125,7 @@ func initGenesis(ctx *cli.Context) error {
 }
 
 func importChain(ctx *cli.Context) error {
-	if len(ctx.Args()) != 1 {
+	if len(ctx.Args()) < 1 {
 		utils.Fatalf("This command requires an argument.")
 	}
 	stack := makeFullNode(ctx)
@@ -146,9 +149,19 @@ func importChain(ctx *cli.Context) error {
 	}()
 	// Import the chain
 	start := time.Now()
+
+	if len(ctx.Args()) == 1 {
 		if err := utils.ImportChain(chain, ctx.Args().First()); err != nil {
 			utils.Fatalf("Import error: %v", err)
 		}
+	} else {
+		for _, arg := range ctx.Args() {
+			if err := utils.ImportChain(chain, arg); err != nil {
+				log.Error("Import error", "file", arg, "err", err)
+			}
+		}
+	}
+
 	fmt.Printf("Import done in %v.\n\n", time.Since(start))
 
 	// Output pre-compaction stats mostly to see the import trashing
@@ -171,6 +184,10 @@ func importChain(ctx *cli.Context) error {
 	fmt.Printf("Allocations:   %.3f million\n", float64(mem.Mallocs)/1000000)
 	fmt.Printf("GC pause:      %v\n\n", time.Duration(mem.PauseTotalNs))
 
+	if ctx.GlobalIsSet(utils.NoCompactionFlag.Name) {
+		return nil
+	}
+
 	// Compact the entire database to more accurately measure disk io and print the stats
 	start = time.Now()
 	fmt.Println("Compacting entire database...")

cmd/geth/main.go

@@ -140,6 +140,7 @@ func init() {
 		utils.EthStatsURLFlag,
 		utils.MetricsEnabledFlag,
 		utils.FakePoWFlag,
+		utils.NoCompactionFlag,
 		utils.SolcPathFlag,
 		utils.GpoMinGasPriceFlag,
 		utils.GpoMaxGasPriceFlag,

cmd/utils/flags.go

@@ -244,7 +244,10 @@ var (
 		Name:  "fakepow",
 		Usage: "Disables proof-of-work verification",
 	}
-
+	NoCompactionFlag = cli.BoolFlag{
+		Name:  "nocompaction",
+		Usage: "Disables db compaction after import",
+	}
 	// RPC settings
 	RPCEnabledFlag = cli.BoolFlag{
 		Name:  "rpc",