[#1764] neofs-node: Validate config before usage

Signed-off-by: Evgenii Stratonikov <evgeniy@morphbits.ru>

cmd/neofs-node/validate.go

@@ -0,0 +1,91 @@
+package main
+
+import (
+	"fmt"
+	"path/filepath"
+
+	"github.com/nspcc-dev/neofs-node/cmd/neofs-node/config"
+	engineconfig "github.com/nspcc-dev/neofs-node/cmd/neofs-node/config/engine"
+	shardconfig "github.com/nspcc-dev/neofs-node/cmd/neofs-node/config/engine/shard"
+	treeconfig "github.com/nspcc-dev/neofs-node/cmd/neofs-node/config/tree"
+	"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/blobstor/blobovniczatree"
+	"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/blobstor/fstree"
+)
+
+// validateConfig validates storage node configuration.
+func validateConfig(c *config.Config) error {
+	shardNum := 0
+	paths := make(map[string]pathDescription)
+	return engineconfig.IterateShards(c, false, func(sc *shardconfig.Config) error {
+		if sc.WriteCache().Enabled() {
+			err := addPath(paths, "writecache", shardNum, sc.WriteCache().Path())
+			if err != nil {
+				return err
+			}
+		}
+
+		if err := addPath(paths, "metabase", shardNum, sc.Metabase().Path()); err != nil {
+			return err
+		}
+
+		treeConfig := treeconfig.Tree(c)
+		if treeConfig.Enabled() {
+			err := addPath(paths, "pilorama", shardNum, sc.Pilorama().Path())
+			if err != nil {
+				return err
+			}
+		}
+
+		blobstor := sc.BlobStor().Storages()
+		if len(blobstor) != 2 {
+			// TODO (@fyrcik): remove after #1522
+			return fmt.Errorf("blobstor section must have 2 components, got: %d", len(blobstor))
+		}
+		for i := range blobstor {
+			switch blobstor[i].Type() {
+			case fstree.Type, blobovniczatree.Type:
+			default:
+				// FIXME #1764 (@fyrchik): this line is currently unreachable,
+				//   because we panic in `sc.BlobStor().Storages()`.
+				return fmt.Errorf("unexpected storage type: %s (shard %d)",
+					blobstor[i].Type(), shardNum)
+			}
+			if blobstor[i].Perm()&0600 != 0600 {
+				return fmt.Errorf("invalid permissions for blobstor component: %s, "+
+					"expected at least rw- for the owner (shard %d)",
+					blobstor[i].Perm(), shardNum)
+			}
+			if blobstor[i].Path() == "" {
+				return fmt.Errorf("blobstor component path is empty (shard %d)", shardNum)
+			}
+			err := addPath(paths, fmt.Sprintf("blobstor[%d]", i), shardNum, blobstor[i].Path())
+			if err != nil {
+				return err
+			}
+		}
+
+		shardNum++
+		return nil
+	})
+}
+
+type pathDescription struct {
+	shard     int
+	component string
+}
+
+func addPath(paths map[string]pathDescription, component string, shard int, path string) error {
+	if path == "" {
+		return fmt.Errorf("%s at shard %d has empty path", component, shard)
+	}
+
+	path = filepath.Clean(path)
+	c, ok := paths[path]
+	if ok {
+		return fmt.Errorf("%s at shard %d and %s at shard %d have the same paths: %s",
+			c.component, c.shard, component, shard, path)
+	}
+
+	paths[path] = pathDescription{shard: shard, component: component}
+	return nil
+}