Re: sccache(-overlay) to speed up rust builds in poudriere

From: Guido Falsi <>
Date: Wed, 27 Sep 2023 11:04:45 UTC
On 27/09/23 13:00, Alexander Leidinger wrote:
> Am 2023-09-27 12:57, schrieb Guido Falsi:
>> On 27/09/23 12:54, Alexander Leidinger wrote:
>>> Am 2023-09-27 10:56, schrieb Charlie Li:
>>>> In poudriere, apart from the fetch phase, network access is not 
>>>> allowed by default so spawning a server that listens on an IP that 
>>>> does not necessarily exist that clients, individual compiler 
>>>> invocations, talk to isn't tenable. At the very least, one would 
>>>> need to architect and implement Unix domain socket support there, 
>>>> which they are happy to consider.
>>> How is poudriere preventing network access outside the fetch phase?
>> two (undocumented) guesses:
>> - removing interfaces (including lo0)
> Then the sccache cache directory shouldn't contain files in my test.
>> - no routing
> Then the localhost connection still works and sccache should work (which 
> would match my empirical test results).

I'm not completely sure we;re talking about the same thing. The scccache 
version you're using is an older version with non standard changes (as 
vishin pointed out, did not check it or the nature of the changes or 
differences with newer versions). Maybe that version is not network 
driven thanks to patches, you should check that before assuming that the 
sccache-overlay version requires networking.

Guido Falsi <>