Emulator is missing a kernel file

[phodina]

Hello,

I've built the x86_64 emulator image with following command:

nix-build --arg configuration '{ device="x86_64"; flavor="vanilla"; }' -A emulator

But when I run the ./result I get this error:

$ ./result
INFO    | Android emulator version 31.1.4.0 (build_id 7920983) (CL:N/A)
ERROR   | This AVD's configuration is missing a kernel file! Please ensure the file "kernel-ranchu" is in the same location as your system image.
ERROR   | ANDROID_SDK_ROOT is defined (/nix/store/04x8sf67kc6w1n813r3i11kgla07mw78-fake-sdk) but cannot find kernel file in /nix/store/04x8sf67kc6w1n813r3i11kgla07mw78-fake-sdk/system-images/ sub directories

I'm on branch commit c8a71bcd1236fad6ae7dea846bab37b9f4c7a641 (HEAD, tag: vanilla-2022022022, tag: grapheneos-2022021721

Any idea what I'm doing wrong or how to fix the error?

[phodina]

Hi @danielfullmer,

could you please help with this cryptic error?

[c2vi]

Hi,

I had the same issue.

This nix command in the AOSP build system runs something like lunch aosp_x86_64-eng, which does not build the necessary files for an emulator. with lunch sdk_x86_64-eng it does.

So setting the productNamePrefix = "sdk_"; option in the config would solve this issue.

Your cmd would then be:

nix-build --arg configuration '{ device="x86_64"; flavor="vanilla"; productNamePrefix = "sdk_"; }' -A emulator

Shouldn't the emulator output set the productNamePrefix always to "sdk_"? Has a robotnix built emulator ever worked like it is right now?

[RankoR]

Facing the same while building AOSP (manually on Arch, not with this project).

So setting the productNamePrefix = "sdk_"; option in the config would solve this issue.

For AOSP 14 correct target would be sdk_phone64_x86_64-trunk_staging-eng/userdebug/user