Try to fall back to 'adb root' if su doesn't exist

This notably works with LineageOS if you haven't rooted the
device, but you have enabled 'ADB only' root access in the
developer options. Conveniently, it seems that that also
avoids tripping SafetyNet too.

Author: pimterry

src/interceptors/android/adb-commands.ts

@@ -69,7 +69,7 @@ export async function getRootCommand(adbClient: adb.AdbClient, deviceId: string)
     // Run whoami with each of the possible root commands
     const rootCheckResults = await Promise.all(
         runAsRootCommands.map((cmd) =>
-            run(adbClient, deviceId, cmd.concat('whoami')).catch(() => {})
+            run(adbClient, deviceId, cmd.concat('whoami')).catch(console.log)
             .then((whoami) => ({ cmd, whoami }))
         )
     )
@@ -79,7 +79,17 @@ export async function getRootCommand(adbClient: adb.AdbClient, deviceId: string)
         .filter((result) => (result.whoami || '').trim() === 'root')
         .map((result) => result.cmd);
 
-    return validRootCommands[0];
+    if (validRootCommands.length >= 1) return validRootCommands[0];
+
+    // If no explicit root commands are available, try to restart adb in root
+    // mode instead. If this works, *all* commands will run as root.
+    // We prefer explicit "su" calls if possible, to limit access & side effects.
+    await adbClient.root(deviceId).catch(() => console.log);
+    const whoami = await run(adbClient, deviceId, ['whoami']).catch(console.log);
+
+    return (whoami || '').trim() === 'root'
+        ? [] // all commands now run as root, so no prefix required.
+        : undefined; // Still not root, no luck.
 }
 
 export async function hasCertInstalled(