title: Forcing the Android emulator to store changes to /system
body: <p>I know this is a recurrent question when working with the Android emulator, but is there a way to force the emulator to accept persistent changes to <code>/system</code>?</p>
  
  <p>The emulator is based on QEMU, so it should be possible, in theory, to force the <code>system</code> image to behave the same way <code>userdata</code> (for instance) does, but I'm not familiar with how QEMU handles things. Any pointers?</p>