Correctly parse DDI image lookup result

idevice/src/services/mobile_image_mounter.rs

@@ -90,7 +90,11 @@ impl ImageMounter {
         self.idevice.send_plist(req).await?;
 
         let res = self.idevice.read_plist().await?;
-        match res.get("ImageSignature") {
+        match res
+            .get("ImageSignature")
+            .and_then(|x| x.as_array())
+            .and_then(|x| x.first())
+        {
             Some(plist::Value::Data(signature)) => Ok(signature.clone()),
             _ => Err(IdeviceError::NotFound),
         }

tools/src/mounter.rs

@@ -17,6 +17,10 @@ pub fn register() -> JkCommand {
             "list",
             JkCommand::new().help("Lists the images mounted on the device"),
         )
+        .with_subcommand(
+            "lookup",
+            JkCommand::new().help("Lookup the image signature on the device"),
+        )
         .with_subcommand(
             "unmount",
             JkCommand::new().help("Unmounts the developer disk image"),
@@ -101,6 +105,17 @@ pub async fn main(arguments: &CollectedArguments, provider: Box<dyn IdeviceProvi
                 println!("{}", pretty_print_plist(&i));
             }
         }
+        "lookup" => {
+            let sig = mounter_client
+                .lookup_image(if product_version < 17 {
+                    "Developer"
+                } else {
+                    "Personalized"
+                })
+                .await
+                .expect("Failed to lookup images");
+            println!("Image signature: {sig:02X?}");
+        }
         "unmount" => {
             if product_version < 17 {
                 mounter_client