bug#64775: /run should be cleaned on boot

[Maxim Cournoyer <maxim.cournoyer@gmail.com>]

Hi,

Hilton Chain via Bug reports for GNU Guix <bug-guix@gnu.org> writes:

> Hi all,
>
> On Sat, 22 Jul 2023 04:24:17 +0800,
> Saku Laesvuori via Bug reports for GNU Guix wrote:
>>
>> [1  <text/plain; us-ascii (quoted-printable)>]
>> > > I vote for TMPFS, since that would also reduce flash wear.
>> > > Honestly I don't get why it's not already using TMPFS.
>> >
>> > One argument could be how much ram it takes:
>> >
>> >   $ du -sc /run/*
>> >   12      /run/blkid
>> >   0       /run/booted-system
>> >   0       /run/current-system
>> >   1312    /run/setuid-programs
>> >   524     /run/udev
>> >   1848    total
>> >
>> > That is with no explicit setuid programs configured, on a machine with a
>> > fairly minimal configuration.
>> >
>> > Not a *huge* amount of ram, but not nothing, either...
>>
>> I'd say it's effectively nothing for almost all devices capable of
>> running Guix. On my laptop the size of /run is 4804 (4.7M). In a quick
>> test one terminal window with only zsh running in it took almost 10
>> times as much ram.
>> [2 signature.asc <application/pgp-signature (7bit)>]
>> No public key for 257D284A2A1D3A32 created at 2023-07-22T04:24:17+0800 using RSA
>
> I'm currently using tmpfs for /tmp, /run and /var/run on my Guix
> Systems.

Without reviewing how our code base uses /run, it seems reasonable that
this should be on a tmpfs.  Can anyone think of a reason not to do so?
Otherwise, I suggest we make it so.

-- 
Thanks,
Maxim