cli: remove --skip parameter from restore

It isn't really a parameter and it's value can be deduced automatically.

Signed-off-by: Evgeniy Stratonikov <evgeniy@nspcc.ru>

cli/server/server.go

@@ -52,10 +52,6 @@ func NewCommands() []cli.Command {
 	var cfgCountInFlags = make([]cli.Flag, len(cfgWithCountFlags))
 	copy(cfgCountInFlags, cfgWithCountFlags)
 	cfgCountInFlags = append(cfgCountInFlags,
-		cli.UintFlag{
-			Name:  "skip, s",
-			Usage: "number of blocks to skip (default: 0)",
-		},
 		cli.StringFlag{
 			Name:  "in, i",
 			Usage: "Input file (stdin if not given)",
@@ -219,7 +215,6 @@ func restoreDB(ctx *cli.Context) error {
 		return cli.NewExitError(err, 1)
 	}
 	count := uint32(ctx.Uint("count"))
-	skip := uint32(ctx.Uint("skip"))
 
 	var inStream = os.Stdin
 	if in := ctx.String("in"); in != "" {
@@ -251,6 +246,10 @@ func restoreDB(ctx *cli.Context) error {
 			return cli.NewExitError(fmt.Errorf("expected height: %d, dump starts at %d",
 				chain.BlockHeight()+1, start), 1)
 		}
+	}
+
+	var skip uint32
+	if chain.BlockHeight() != 0 {
 		skip = chain.BlockHeight() + 1 - start
 	}
 
@@ -264,6 +263,11 @@ func restoreDB(ctx *cli.Context) error {
 	if count == 0 {
 		count = allBlocks - skip
 	}
+	log.Info("initialize restore",
+		zap.Uint32("start", start),
+		zap.Uint32("height", chain.BlockHeight()),
+		zap.Uint32("skip", skip),
+		zap.Uint32("count", count))
 
 	gctx := newGraceContext()
 	var lastIndex uint32