Re: [Nix-dev] vmTools.runInLinuxImage with ubuntu 1204 image blocks on getrandom()

[Domen Kožar]

Sure - open a PR adding virtio_rng.

On Tue, Jul 26, 2016 at 3:43 PM, Maarten Hoogendoorn 
wrote:

> OK, fixed this problem by adding the virtio_rng device to the kernel and
> qemu opts, see below.
>
> Would a PR to make these additions the default in
> build-support/vm/default.nix be appreciated?
>
> with import  {}; with pkgs;
> let
>  script = ''
># /dev/urandom works fine
>dd if=/dev/urandom of=/dev/null bs=1M count=1
>
># /dev/random only works if virtio_rng is enabled.
>dd if=/dev/random of=/dev/null bs=1M count=1
>  '';
>   img = runCommand "nix-binary-tarball-test" {
> diskImage = vmTools.diskImages.ubuntu1204x86_64;
> QEMU_OPTS = "-device virtio-rng-pci";
>} script;
>runCustomInImage = vmTools.override {
>  rootModules = [ "virtio_rng" "virtio_pci" "virtio_blk"
> "virtio_balloon" "ext4" "unix" "9p" "9pnet_virtio" "rtc_cmos" ];
>};
> in
>runCustomInImage.runInLinuxImage img #<- does work
> #  vmTools.runInLinuxImage img # < - does not work
>
> 2016-07-16 15:39 GMT+02:00 Maarten Hoogendoorn :
>
>> Hi there,
>>
>> I'm trying to run some tests on a binary program on ubuntu 1204 using
>> vmTools.runInLinuxImage. It just blocks on getrandom().
>>
>> I've created a minimal reproducible example:
>>
>> with import  {}; with pkgs;
>> let
>>  script = ''
>># /dev/urandom works fine
>>dd if=/dev/urandom of=/dev/null bs=1M count=1
>>
>>   # /dev/random does not work!
>>${pkgs.strace}/bin/strace \
>>  dd if=/dev/random of=/dev/null bs=1M count=1
>>  '';
>>   img = runCommand "nix-binary-tarball-test" {
>> diskImage = vmTools.diskImages.ubuntu1204x86_64;
>> #QEMU_OPTS = "-device virtio-rng-pci";
>>} script;
>> in
>>   vmTools.runInLinuxImage img
>>
>> I read somewhere that adding a virtio-rng-pci device could solve this,
>> but it made no difference.
>>
>> Could someone confirm this behavior? And maybe one of you has an idea on
>> how to fix this.
>>
>
>
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>
>
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Re: [Nix-dev] vmTools.runInLinuxImage with ubuntu 1204 image blocks on getrandom()

[Maarten Hoogendoorn]

OK, fixed this problem by adding the virtio_rng device to the kernel and
qemu opts, see below.

Would a PR to make these additions the default in
build-support/vm/default.nix be appreciated?

with import  {}; with pkgs;
let
 script = ''
   # /dev/urandom works fine
   dd if=/dev/urandom of=/dev/null bs=1M count=1

   # /dev/random only works if virtio_rng is enabled.
   dd if=/dev/random of=/dev/null bs=1M count=1
 '';
  img = runCommand "nix-binary-tarball-test" {
diskImage = vmTools.diskImages.ubuntu1204x86_64;
QEMU_OPTS = "-device virtio-rng-pci";
   } script;
   runCustomInImage = vmTools.override {
 rootModules = [ "virtio_rng" "virtio_pci" "virtio_blk"
"virtio_balloon" "ext4" "unix" "9p" "9pnet_virtio" "rtc_cmos" ];
   };
in
   runCustomInImage.runInLinuxImage img #<- does work
#  vmTools.runInLinuxImage img # < - does not work

2016-07-16 15:39 GMT+02:00 Maarten Hoogendoorn :

> Hi there,
>
> I'm trying to run some tests on a binary program on ubuntu 1204 using
> vmTools.runInLinuxImage. It just blocks on getrandom().
>
> I've created a minimal reproducible example:
>
> with import  {}; with pkgs;
> let
>  script = ''
># /dev/urandom works fine
>dd if=/dev/urandom of=/dev/null bs=1M count=1
>
>   # /dev/random does not work!
>${pkgs.strace}/bin/strace \
>  dd if=/dev/random of=/dev/null bs=1M count=1
>  '';
>   img = runCommand "nix-binary-tarball-test" {
> diskImage = vmTools.diskImages.ubuntu1204x86_64;
> #QEMU_OPTS = "-device virtio-rng-pci";
>} script;
> in
>   vmTools.runInLinuxImage img
>
> I read somewhere that adding a virtio-rng-pci device could solve this,
> but it made no difference.
>
> Could someone confirm this behavior? And maybe one of you has an idea on
> how to fix this.
>
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Re: [Nix-dev] vmTools.runInLinuxImage with ubuntu 1204 image blocks on getrandom()

[Martijn Vermaat]

2016-07-16 15:39 GMT+02:00 Maarten Hoogendoorn :
> Could someone confirm this behavior? And maybe one of you has an idea on
how to fix this.

I can confirm the behaviour (and that adding the virtio device makes no
difference), but cannot solve it :)
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[Nix-dev] vmTools.runInLinuxImage with ubuntu 1204 image blocks on getrandom()

[Maarten Hoogendoorn]

Hi there,

I'm trying to run some tests on a binary program on ubuntu 1204 using
vmTools.runInLinuxImage. It just blocks on getrandom().

I've created a minimal reproducible example:

with import  {}; with pkgs;
let
 script = ''
   # /dev/urandom works fine
   dd if=/dev/urandom of=/dev/null bs=1M count=1

  # /dev/random does not work!
   ${pkgs.strace}/bin/strace \
 dd if=/dev/random of=/dev/null bs=1M count=1
 '';
  img = runCommand "nix-binary-tarball-test" {
diskImage = vmTools.diskImages.ubuntu1204x86_64;
#QEMU_OPTS = "-device virtio-rng-pci";
   } script;
in
  vmTools.runInLinuxImage img

I read somewhere that adding a virtio-rng-pci device could solve this, but
it made no difference.

Could someone confirm this behavior? And maybe one of you has an idea on
how to fix this.
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