Extend tcmu dev_config to support optional device ID

Xun Chen · Xun Chen · commit 31abec417210 · 2026-02-09T12:07:19.000+08:00
Signed-off-by: Xun Chen &lt;xunchen@hust.edu.cn&gt;
diff --git a/pkg/snapshot/storage.go b/pkg/snapshot/storage.go
@@ -299,7 +299,7 @@ func AttachDevice(ctx context.Context, params *AttachDeviceParams) (devName stri
 		}
 	}()
 
-	if err = os.WriteFile(path.Join(targetPath, "control"), ([]byte)(fmt.Sprintf("dev_config=overlaybd/%s", configPath)), 0666); err != nil {
+	if err = os.WriteFile(path.Join(targetPath, "control"), ([]byte)(fmt.Sprintf("dev_config=overlaybd/%s;%s", configPath, snID)), 0666); err != nil {
 		return devName, fmt.Errorf("failed to write target dev_config for %s: dev_config=overlaybd/%s: %w", targetPath, configPath, err)
 	}
 

Original file line number	Diff line number	Diff line change
`@@ -299,7 +299,7 @@ func AttachDevice(ctx context.Context, params *AttachDeviceParams) (devName stri`
`299`	`299`	`}`
`300`	`300`	`}()`
`301`	`301`
`302`		`- if err = os.WriteFile(path.Join(targetPath, "control"), ([]byte)(fmt.Sprintf("dev_config=overlaybd/%s", configPath)), 0666); err != nil {`
	`302`	`+ if err = os.WriteFile(path.Join(targetPath, "control"), ([]byte)(fmt.Sprintf("dev_config=overlaybd/%s;%s", configPath, snID)), 0666); err != nil {`
`303`	`303`	`return devName, fmt.Errorf("failed to write target dev_config for %s: dev_config=overlaybd/%s: %w", targetPath, configPath, err)`
`304`	`304`	`}`
`305`	`305`