Emulator

Revision 40 as of 2013-11-25 15:00:02

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Getting the emulator

Minimal requirements for the emulator

  • 512MB of RAM dedicated for the emulator
  • 4GB of disk space
  • OpenGL capable desktop drivers (due the OpenGLES 2.0 translator)

Installing the pre-built emulator

/!\ If you are on amd64

  • A word of warning though: if you are on amd64, take care if you uninstall the emulator and run apt-get autoremove to automatically clean the dependencies, this will break your system. Issue was fixed with android-emulator 20131120-0225-0ubuntu2, but you could still have the issue (in case you installed a previous version of the emulator, so check if you have libc6-amd64 installed in your system).

If that happens to you:

  1. reboot and eventually press shift to get to grub
  2. press e to edit your command line
  3. on the line "linux <…>", remove "quiet splash" and replace with break=bottom

  4. press F10 or Ctrl-x to start, you will be dropped in the initramfs busybox
  5. mkdir /mnt
  6. you need to know your FS layout and mount /dev/<your root partition> in /mnt

  7. cd /mnt/lib64/ && rm ld-linux-x86-64.so.2 && ln -s /lib/x86_64-linux-gnu/ld-2.17.so ld-linux-x86-64.so.2

  8. reboot

Instructions

  • Install android-emulator package in Trusty
  • Copy out emulator to read/write directory
  • Generate sdcard
  • Run the emulator

$ sudo apt-get install android-emulator
$ cp -r /usr/share/android/emulator/ ~/
$ cd ~/emulator/
$ ./build-emulator-sdcard.sh
$ ./run-emulator.sh
  • For other releases than Trusty Thar it seems to work well to just download the latest android-emulator .deb from https://launchpad.net/ubuntu/+source/android and install it with "sudo dpkg -i </path/to/package>.deb" instead of the apt-get install step above.

Maintenance

Until system-image works in the emulator, you can do the following to rebuild the image using the cached ubuntu-rootfs.tar.xz:

$ cd ~/emulator/
$ ./build-emulator-sdcard.sh

To update the image to the newest version of ubuntu-rootfs.tar.xz:

$ cd ~/emulator/
$ rm -f ./out/target/product/generic/ubuntu-rootfs.tar.xz
$ ./build-emulator-sdcard.sh

Building from scratch

To build

$ sudo apt-get install phablet-tools git bzr

$ # install android build-dependencies
$ sudo apt-get build-dep android

$ # if we're on amd64, we need to pull in certain 32-bit packages explicitly
$ sudo apt-get install libx11-dev:i386 libreadline6-dev:i386 libgl1-mesa-dev:i386 zlib1g-dev:i386

$ # this here is only needed if you didn't follow https://wiki.ubuntu.com/Touch/Porting before
$ sudo apt-get install schedtool openjdk-6-jdk g++-multilib bison flex

$ # and then work around the fact that libgl1-mesa-dev isn't Multi-Arch: same yet
$ sudo ln -s /usr/lib/x86_64-linux-gnu/mesa/libGL.so.1 /usr/lib/x86_64-linux-gnu/libGL.so

$ mkdir -p emulator/
$ phablet-dev-bootstrap emulator
$ cd emulator
$ source build/envsetup.sh
$ lunch cm_goldfish-eng
$ mka

To generate sdcard with the ubuntu rootfs

$ ./build/tools/build-emulator-sdcard.sh

Launch the emulator with the run-emulator script:

$ ./build/tools/run-emulator.sh

You can also launch the emulator using your own arguments and options:

$ emulator -verbose -gpu on -system $OUT/system.img -memory 512 -show-kernel -shell -no-jni -qemu -cpu cortex-a8

As of 2013/11/05 there is a bug in the goldfish kernel wrt AppArmor, so you may want to launch with AppArmor disabled until this issue is resolved:

$ emulator -verbose -gpu on -system $OUT/system.img -memory 512 -show-kernel -shell -no-jni -qemu -cpu cortex-a8 -append 'apparmor=0'

Username & password are:

phablet
phablet

To update your existing working tree to pull in new changes from the server, run repo sync.

For more information about how to use the repo command to manage your android working tree, see this page.

Using the emulator

After starting the emulator with the wrapper script following should be available:

  • Adb
    • Emulator will appear in the output of $ adb devices, and will, once fully booted allow
      $ adb shell
      access into ubuntu.
  • Serial console
    • The terminal will start an Ubuntu console by default, which can be used as any virtual console. Just be aware that hiiting Control + C will stop the emulator.
  • SSH access
    • SSH is enabled by default in the emulator, but you can only access it via localhost (QEMU handles the routes and NAT internally). All you need is to forward the target SSH port to a known port at your host:
      $ adb forward tcp:9999 tcp:22
      $ ssh phablet@localhost -p 9999
  • Telnet access
    • Once launched graphical window title will show a port number, e.g. 5554. Connect to that over telnet, to send hardware events to the emulator
      $ telnet 127.0.0.1 5554
      Trying 127.0.0.1...
      Connected to 127.0.0.1.
      Escape character is '^]'.
      Android Console: type 'help' for a list of commands
      OK
      help
      Android console command help:
      
          help|h|?         print a list of commands
          event            simulate hardware events
          geo              Geo-location commands
          gsm              GSM related commands
          cdma             CDMA related commands
          kill             kill the emulator instance
          network          manage network settings
          power            power related commands
          quit|exit        quit control session
          redir            manage port redirections
          sms              SMS related commands
          avd              control virtual device execution
          window           manage emulator window
          qemu             QEMU-specific commands
          sensor           manage emulator sensors
      
      try 'help <command>' for command-specific help
      OK

Keyboard Commands

Emulated Device Key

Keyboard Key

Power button

F7

Audio volume up button

KEYPAD_PLUS, Ctrl-F5

Audio volume down button

KEYPAD_MINUS, Ctrl-F6

Switch to previous layout orientation (for example, portrait, landscape)

KEYPAD_7, Ctrl-F11

Switch to next layout orientation (for example, portrait, landscape)

KEYPAD_9, Ctrl-F12

Known Issues

  • Powerd is disabled by default as suspending & resuming corrupts the root filesystem.

  • A few other services might also be disabled by default until everything is working properly with the emulator. Please check build-emulator-sdcard.sh to see the extra customization done for the emulator image.

  • The first boot might take a few minutes as it generates the ssh key, install the click packages and so on. It shouldn't take too much though, always check with adb if the emulator is still running correctly (e.g. check with top).
  • It's quite common for Qemu to hang while booting (like an I/O-type hang), just abort and restart the emulator (still needs proper debugging).
  • If Unity8 fails to start, make sure your i386 GL driver is properly in place (check for error libGL.so.1: cannot open shared object file: No such file or directory when starting the emulator). If everything goes well, you should see 'qemu.gles=1' in the qemu kernel parameters.

Extras