I needed to test out some patches for AOSP having only a Windows machine.
The Goldfish Android Emulator was not enough; I had to use the Cuttlefish virtual device.
Using Cuttlefish in WSL2 wasn’t officially supported at the time of writing.
I succeeded running it at the manifest hash 81e549decdee241c84d305c2ccc1bd2a73fc2eb2 which was the latest main at the time of the attempt.
I followed Download the Android source, then Build Android.
I used the lunch target aosp_cf_x86_64_phone-trunk_staging-eng.
The I tried to run CVD using launch_cvd. It was not in my $PATH, but after running envsetup again, it got into my $PATH.
The first error I had was:
[2024-07-27T18:08:00.444004939+00:00 ERROR devices::virtio::virtio_pci_device] failed to activate device: pcivirtio-sound failed to clone interrupt_evt: Too many open files (os error 24)
[2024-07-27T18:08:00.444020599+00:00 ERROR devices::virtio::virtio_pci_device] failed to activate device: pcivirtio-sound failed to clone interrupt_evt: Too many open files (os error 24)
[2024-07-27T18:08:00.444035299+00:00 ERROR devices::virtio::virtio_pci_device] failed to activate device: pcivirtio-sound failed to clone interrupt_evt: Too many open files (os error 24)
[2024-07-27T18:08:00.444043389+00:00 ERROR devices::virtio::virtio_pci_device] failed to activate device: pcivirtio-sound failed to clone interrupt_evt: Too many open files (os error 24)
[2024-07-27T18:08:00.444051219+00:00 ERROR devices::virtio::virtio_pci_device] failed to activate device: pcivirtio-sound failed to clone interrupt_evt: Too many open files (os error 24)
[2024-07-27T18:08:00.444065098+00:00 ERROR devices::virtio::virtio_pci_device] failed to activate device: pcivirtio-sound failed to clone interrupt_evt: Too many open files (os error 24)
Reason: my Debian in WSL2 had a very low ulimit -n, just 1024.
Fix: bump to 8192 with ulimit -n 8192.
The second error I had was:
[2024-07-27T18:52:02.351063572+00:00 ERROR crosvm] exiting with error 1: the architecture failed to build the vm
Caused by:
failed to create a PCI root hub: failed to create proxy device: Failed to configure tube: failed to receive packet: Connection reset by peer (os error 104)
Detected unexpected exit of monitored subprocess /home/line/aosp-main/out/host/linux-x86/bin/process_restarter
Subprocess /home/line/aosp-main/out/host/linux-x86/bin/process_restarter (27196) has exited with exit code 1
Stopping all monitored processes due to unexpected exit of critical process
Reason: something going wrong with sandboxing?
Fix: invoke cvd with launch_cvd --enable-sandbox=false. I do not know the negative consequences of this.
To see the CVD UI, I used the Web UI. I am not sure if it is documented anywhere. By default an httpd spins up on port 8443.
To get it from outside WSL2:
netsh interface portproxy add v4tov4 listenaddress=0.0.0.0 listenport=8443 connectaddress=192.168.219.62 connectport=8443
The IP address above is the IP address of the WSL2 instance. May vary.
Optional, to access the Web UI from other nodes in the local network:
netsh advfirewall firewall add rule name=”Open Port 8443 for WSL2” dir=in action=allow protocol=TCP localport=8443
The UI is a bit finicky. It did not work in Safari for me. Rebooting CVD sometimes caused the picture to disappear. Reloading and reopening the device helped at times.
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