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Subject: [bug#41882] [PATCH] channels: Allow specifying per-channel
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From: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@gnu.org>
References: <20200615210343.18964-1-kuba@kadziolka.net>
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Hi,

Jakub K=C4=85dzio=C5=82ka <kuba@kadziolka.net> skribis:

>> > It gets tiring to have to specify --allow-downgrades when pulling, so I
>> > added a way of specifying it in the channels file. As a bonus, it's mo=
re
>> > granular.
>> >
>> > If this is the right approach, I'll add some docs. Also, is there a te=
st
>> > that exercises this function?
>>=20
>> I don=E2=80=99t think =E2=80=9Callow-downgrade?=E2=80=9D should be a pro=
perty of <channel>,
>> because conceptually it=E2=80=99s an unrelated piece of configuration.  =
So I
>> think it=E2=80=99s configuration that belongs elsewhere, but there=E2=80=
=99s no
>> configuration file for =E2=80=98guix pull=E2=80=99 etc.
>
> It's a property of the channel that the git repo in question is not
> monotonic ;)

I don=E2=80=99t think we can meaningfully support channels that are rebased=
 all
the time.  I agree it=E2=80=99s a use case for some developers, and we need=
 to
accommodate for that, but I wouldn=E2=80=99t want a general mechanism to ma=
rk a
channel as non-monotonic.

> Also, AFAIU, the channels.scm *is* the configuration file for guix
> pull, and it is the primary, if not only use of <channel>.

The <channel> data structure is used by =E2=80=98guix pull=E2=80=99, =E2=80=
=98guix
time-machine=E2=80=99, and =E2=80=98guix describe=E2=80=99.  It=E2=80=99s t=
he primary way to communicate
information about the set of channels being used.  So to me it=E2=80=99s ve=
ry
much orthogonal to whether one wants to allow downgrades, allow
offloading, and enable colored output.  :-)

WDYT?

Thanks,
Ludo=E2=80=99.