From c75f18bfcfe84ea02ec4169eb3ce620d73903d8d Mon Sep 17 00:00:00 2001
From: Roman Khimov <roman@nspcc.ru>
Date: Wed, 13 Sep 2023 22:15:39 +0300
Subject: [PATCH] node: don't mkdir random paths from configuration

Unbreak peapods:
  2023/09/13 18:50:36 open shard S4wpuCnzpWW7SbwhER3U1v: could not open *blobstor.BlobStor: open substorage peapod: open BoltDB instance: open /storage/peapod0.db: is a directory

Call `stat()` gently instead walking up. FS mount point has to exist there in
any event and we should have some access to it.

The real problem is that #2462 (introducing Peapod) was correct on its own.
And #2495 (introducing capacity) was also correct on its own. But they don't
work together.

Refs 7c543077055000805b023971e3cf80fa3b392cdd.
Refs c060b16fca8c29728f99747b27b91ec1e75989d1.

util.MkdirAllX will be removed from code in most of the cases.

Signed-off-by: Roman Khimov <roman@nspcc.ru>
---
 CHANGELOG.md             |  1 +
 cmd/neofs-node/config.go | 18 ++++++++++++++----
 2 files changed, 15 insertions(+), 4 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index a95bbdd478b..4b6f9d1825b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@ Changelog for NeoFS Node
 ## [Unreleased]
 
 ### Fixed
+- Inability to start node with peapods configured (#2576)
 
 ### Removed
 
diff --git a/cmd/neofs-node/config.go b/cmd/neofs-node/config.go
index 219398cdb2d..077245332ac 100644
--- a/cmd/neofs-node/config.go
+++ b/cmd/neofs-node/config.go
@@ -4,9 +4,11 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"io/fs"
 	"net"
 	"os"
 	"os/signal"
+	"path/filepath"
 	"sync"
 	atomicstd "sync/atomic"
 	"syscall"
@@ -932,12 +934,20 @@ func writeSystemAttributes(c *cfg) error {
 	for _, sh := range c.applicationConfiguration.EngineCfg.shards {
 		for _, subStorage := range sh.SubStorages {
 			path := subStorage.Path
-			paths = append(paths, path)
 
-			err := util.MkdirAllX(path, subStorage.Perm)
-			if err != nil {
-				return fmt.Errorf("can not create (ensure it exists) dir by '%s' path: %w", path, err)
+			for len(path) > 1 { // Dir returns / or . if nothing else left.
+				fi, err := os.Stat(path)
+				if err == nil && fi.IsDir() {
+					break
+				}
+				if err != nil && !errors.Is(err, fs.ErrNotExist) {
+					return fmt.Errorf("accessing %q: %w", path, err)
+				}
+				path = filepath.Dir(path)
 			}
+
+			paths = append(paths, path)
+
 		}
 	}