bugfix:sync parent dir to ensure blob entry is reliably stored

Signed-off-by: ningmingxiao <ning.mingxiao@zte.com.cn>

plugins/content/local/writer.go

@@ -139,6 +139,9 @@ func (w *writer) Commit(ctx context.Context, size int64, expected digest.Digest,
 		return err
 	}
 
+	if err := syncDir(filepath.Dir(target)); err != nil {
+		return err
+	}
 	// Enable content blob integrity verification if supported
 
 	if w.s.integritySupported {

plugins/content/local/writer_unix.go

@@ -0,0 +1,37 @@
+//go:build !windows
+
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package local
+
+import (
+	"fmt"
+	"os"
+)
+
+func syncDir(dir string) error {
+	dirF, err := os.Open(dir)
+	if err != nil {
+		return fmt.Errorf("failed to open dir %s: %w", dir, err)
+	}
+	err = dirF.Sync()
+	dirF.Close()
+	if err != nil {
+		return fmt.Errorf("failed to sync dir %s: %w", dir, err)
+	}
+	return nil
+}

plugins/content/local/writer_windows.go

@@ -0,0 +1,22 @@
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package local
+
+// sync dir doesn't support in windows
+func syncDir(dir string) error {
+	return nil
+}