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

From: Ludovic Courtès
Subject: Re: [Nix-dev] /dev/shm inconsistency in chroot
Date: Fri, 24 Jan 2014 22:17:01 +0100
User-agent: Gnus/5.130007 (Ma Gnus v0.7) Emacs/24.3 (gnu/linux)

Sree Harsha Totakura <address@hidden> skribis:

> On 01/24/2014 06:13 PM, Mark H Weaver wrote:
>> Shea Levy <address@hidden> 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.


>> 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.

> 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.


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