Rename to import-snapshot, require more than finality for state export

Signed-off-by: Jakub Sztandera <[email protected]>

cli/chain.go

@@ -876,7 +876,10 @@ var chainExportCmd = &cli.Command{
 			return fmt.Errorf("must specify filename to export chain to")
 		}
 
-		rsrs := cctx.Int64("recent-stateroots")
+		rsrs := abi.ChainEpoch(cctx.Int64("recent-stateroots"))
+		if cctx.IsSet("recent-stateroots") && rsrs < build.Finality {
+			return fmt.Errorf("\"recent-stateroots\" has to be greater than %d", build.Finality)
+		}
 
 		fi, err := os.Create(cctx.Args().First())
 		if err != nil {
@@ -894,7 +897,7 @@ var chainExportCmd = &cli.Command{
 			return err
 		}
 
-		stream, err := api.ChainExport(ctx, abi.ChainEpoch(rsrs), ts.Key())
+		stream, err := api.ChainExport(ctx, rsrs, ts.Key())
 		if err != nil {
 			return err
 		}

cmd/lotus/daemon.go

@@ -100,10 +100,10 @@ var DaemonCmd = &cli.Command{
 		},
 		&cli.StringFlag{
 			Name:  "import-chain",
-			Usage: "on first run, load chain from given file",
+			Usage: "on first run, load chain from given file and validate",
 		},
 		&cli.StringFlag{
-			Name:  "snapshot",
+			Name:  "import-snapshot",
 			Usage: "import chain state from a given chain export file",
 		},
 		&cli.BoolFlag{