[Nix-dev] Deterministic(bit-perfect) Builds

[Vladimír Čunát]

On 06/25/2013 01:20 PM, Vladimír Čunát wrote:
> On 06/25/2013 11:43 AM, phreedom at yandex.ru wrote:
>>> Wouldn't it be more certain/universal to LD_PRELOAD or something to
>>> achieve that the system time always looks the same to any build-time
>>> tool? (e.g. UNIX time =0)
>>
>> This is a bit platform-specific and there may be other gotchas like
>> getting the
>> mtime using stat instead of querying system time. Other impurities in
>> static
>> libs are uid/gid of the file.
>
> I would think that the file timestamps also originate from system time
> so we could kill more birds with one stone... but I don't have a clue
> whether/how such a sandbox can be done easily (in Linux; I assume our
> main target for purity is Linux, the others are impure for other reasons
> as well).

Ah, I knew I've seen the answer before, somewhere... libfaketime :-)

https://github.com/wolfcw/libfaketime/blob/master/README


Vlada


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