[gentoo-portage-dev] Re: @sets and @profile does not work when ROOT=PORTAGE_CONFIGROOT=/my/new/root

[Duncan <1i5t5.duncan@cox.net>]

Zac Medico posted on Thu, 22 Oct 2015 11:54:39 -0700 as excerpted:

> On 10/22/2015 11:29 AM, Joakim Tjernlund wrote:
>> On Thu, 2015-10-22 at 08:54 -0700, Zac Medico wrote:
>>> For example, the default set configuration located at
>>> /usr/share/portage/config/sets/portage.conf does something similar
>>> with %(PORTAGE_CONFIGROOT)s.
>> 
>> Nice! I am a bit puzzled over the trailing s in ..)s, is that a typo?
>> if not what does it mean?
> 
> The trailing s is required. It's python configparser interpolation
> syntax:
> 
> https://docs.python.org/3/library/configparser.html#interpolation-of-values

Thanks.  That's a pattern I now recognize and identify elsewhere. =:^)

And that recognition/identification presumably answers a low-priority 
(thus never asked) question I've had for some time about layman.conf, and 
what/why it uses variable interpolation with the same trailing s, which I 
hadn't understood until now.

For me, the answer is now essentially "the trailing 's' is an artifact of 
the python implementation and its use of the configparser lib, and yes, 
it's necessary, and doesn't mean the path now needs a literal trailing 
's' as well."

Again, thanks.  Seeing similar trailing-s usage should be way less 
confusing now. =:^)

-- 
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"Every nonfree program has a lord, a master --
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