Unable to start Fuchsia Emulator on Ubuntu

[Rohan Thacker]

Hello Everyone,

Hope you're well, I am trying to build Fuchsia OS and run it on the Fuchsia Emulator femu, but after waiting for the emulator to start the fx command exists and displays the error below.

failed to create Fuchsia device device health check failed. Unable to ssh due to error: Error: Cannot start Fuchsia Emulator. Exit status is 1

I have followed the instructions provided at fuchsia.dev, the build completes successfully and the commands used to build the OS was

fx set core.qemu-x64 --with //examples/hello_world fx build

Subsequently, I tried running with headless mode turned on "fx vdl start -N --headless" however this results in the same error as above, I also tried to build the OS without the --with argument but received the same error.

On looking through the log file, we see a network error on the second last line of the log file, maybe this is of interest? it reads:

emu-system-x86_64-headless: network script /etc/qemu-ifdown failed with status 256

I am using Ubuntu 21.04 on my machine,

Note: I've also posted this question on the stackover flow community

Thank you,

Rohan Thacker

[Yilong Li]

It seems that the network configuration scripts /etc/qemu-ifup and /etc/qemu-ifdown are missing. You can work around it by installing the qemu package: 

$ sudo apt install qemu

I am using Ubuntu 21.04 on my machine.

P.S: I've also posted this question on the stackover flow community

Thank you,

Rohan Thacker

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-Yilong

[Rohan Thacker]

Thank you Yilong, installing qemu resolved the network issues. Does this mean qemu is a required dependency? In other words, should this line in the docs be updated "sudo apt-get install curl git unzip" to include qemu?

[Amit Uttamchandani]

+Gabe Schine 

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[Gabe Schine]

Yes, if this is a prereq, preflight should check for it.

If someone is willing, the code to edit is here: https://osscs.corp.google.com/fuchsia/fuchsia/+/master:src/developer/ffx/plugins/platform/preflight/src/check/build_prereqs.rs;l=13

It'd be an excessively simple CL ;).

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Gabe Schine

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[Rohan Thacker]

May I do this?

If I understand correctly, Adding "qemu" to line 13 of this file is required?

[Gabe Schine]

That's correct, and yes, please go ahead! You can send the review to me.

[James Tucker]

We ship a prebuilt for qemu, actually two, one qemu, one femu.

I don't see any of our scripts depending on this path in /etc. Some distros wouldn't put a file there, also, as they're trending toward not writing package static files to /etc.

Is this a bug in femu that needs to be filed?

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[Yilong Li]

On Mon, May 17, 2021 at 10:30 AM James Tucker <ra...@google.com> wrote:

We ship a prebuilt for qemu, actually two, one qemu, one femu.

I don't see any of our scripts depending on this path in /etc. Some distros wouldn't put a file there, also, as they're trending toward not writing package static files to /etc.

QEMU/AEMU use /etc/qemu-(ifup|ifdown) as fallback scripts if "script=" or "downscript=" are not specified in QEMU command arguments.

https://android.googlesource.com/platform/external/qemu/+/emu-master-dev/net/tap.c#900

AEMU has its own fallback logic but it seems we didn't use this if it runs Fuchsia (using its min-config mode): 

https://android.googlesource.com/platform/external/qemu/+/emu-master-dev/android-qemu2-glue/main.cpp#2107

 

Is this a bug in femu that needs to be filed?

 Filed fxbug.dev/76994.

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-Yilong

[Camden Bruce]

Does this affect other versions of Ubuntu, or Debian? Last I checked it was working fine for me on 20.04.

[Yilong Li]

The change has landed on both "fx vdl" and "fx emu" scripts (https://fuchsia-review.googlesource.com/c/fuchsia/+/530910) to set "downscripts" argument correctly, so it should work now for any distros.

To view this discussion on the web visit https://groups.google.com/a/fuchsia.dev/d/msgid/discuss/66e968d6-d57a-4db4-ab78-7f5a302b4a37n%40fuchsia.dev.

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-Yilong

[Camden Bruce]

Okay cool