Merge pull request #46471 from foundriesio/atomic-layer-data-write

daemon: overlay2: Write layer metadata atomically

daemon/graphdriver/overlay2/overlay.go

@@ -23,6 +23,7 @@ import (
 	"github.com/docker/docker/pkg/containerfs"
 	"github.com/docker/docker/pkg/directory"
 	"github.com/docker/docker/pkg/idtools"
+	"github.com/docker/docker/pkg/ioutils"
 	"github.com/docker/docker/pkg/parsers"
 	"github.com/docker/docker/quota"
 	units "github.com/docker/go-units"
@@ -383,7 +384,7 @@ func (d *Driver) create(id, parent string, opts *graphdriver.CreateOpts) (retErr
 	}
 
 	// Write link id to link file
-	if err := os.WriteFile(path.Join(dir, "link"), []byte(lid), 0o644); err != nil {
+	if err := ioutils.AtomicWriteFile(path.Join(dir, "link"), []byte(lid), 0o644); err != nil {
 		return err
 	}
 
@@ -396,7 +397,7 @@ func (d *Driver) create(id, parent string, opts *graphdriver.CreateOpts) (retErr
 		return err
 	}
 
-	if err := os.WriteFile(path.Join(d.dir(parent), "committed"), []byte{}, 0o600); err != nil {
+	if err := ioutils.AtomicWriteFile(path.Join(d.dir(parent), "committed"), []byte{}, 0o600); err != nil {
 		return err
 	}
 
@@ -405,7 +406,7 @@ func (d *Driver) create(id, parent string, opts *graphdriver.CreateOpts) (retErr
 		return err
 	}
 	if lower != "" {
-		if err := os.WriteFile(path.Join(dir, lowerFile), []byte(lower), 0o666); err != nil {
+		if err := ioutils.AtomicWriteFile(path.Join(dir, lowerFile), []byte(lower), 0o666); err != nil {
 			return err
 		}
 	}