[Nix-dev] /dev/shm inconsistency in chroot

[Shea Levy]

On 01/24/2014 04:17 PM, Ludovic Courtès wrote:
> Sree Harsha Totakura <sreeharsha at totakura.in> skribis:
>
>> On 01/24/2014 06:13 PM, Mark H Weaver wrote:
>>> Shea Levy <shea at shealevy.com> writes:
>>>>> Another option is to mount  a devtmpfs there, for systems which support it.
>> devtmpfs may give different devices on each machine and they may hinder
>> our build reproducibility.
> OK.
>
>>> The thing is, we don't actually want most of the system's devices to be
>>> in the build environment, do we?  These are all impurities.  I don't
>>> think we want /dev/sda, for example.
>> Sure, I agree.  I propose we start enumerating commonly needed devices
>> and create them.
> Sounds good.
>
> The major/minor device numbers may not be portable across OSes, which
> may be a problem for Nix, so that code may need to be #ifdef’d.

Generally a good idea, but note that for now chroot is not enabled on 
non-Linux

>> If in future, a package requires access to certain device while
>> building (or during tests) we can include it in our list of created
>> device nodes.
> Yes, but keep in mind that we’re not going to change that often, because
> it’s inconvenient.
>
> Thanks,
> Ludo’.