From: Nikita Karetnikov <nikita@karetnikov.org>
To: "Ludovic Courtès" <ludo@gnu.org>
Cc: bug-guix@gnu.org
Subject: Re: guix-package --roll-back
Date: Tue, 01 Jan 2013 08:57:42 -0500 [thread overview]
Message-ID: <87obh980pr.fsf@karetnikov.org> (raw)
In-Reply-To: 87y5gf8sm1.fsf@gnu.org
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>> + (match:substring (regexp-exec (profile-rx profile)
>> + (basename (readlink profile))) 1))
> Instead write:
> (and=> (regexp-exec ...)
> (cut match:substring <> 1))
> So that the thing returns #f when there are is no associated profile
> number. OTOH, does that ever occur?
I doubt so, but I also think that it would be better to keep 'and=>' to
prevent possible problems.
> It should be based on rename(2) to be atomic. See the ‘switchLink’
> function in Nix for how to do it.
Could you elaborate? Should I call C from Guile?
Nikita
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next prev parent reply other threads:[~2013-01-01 13:57 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-21 22:49 guix-package --roll-back Nikita Karetnikov
2012-12-29 23:09 ` Nikita Karetnikov
2012-12-29 23:13 ` Andreas Enge
2012-12-30 15:30 ` Ludovic Courtès
2013-01-01 13:57 ` Nikita Karetnikov [this message]
2013-01-01 22:58 ` Ludovic Courtès
2013-01-03 5:42 ` Nikita Karetnikov
2013-01-03 14:41 ` Ludovic Courtès
2013-01-04 18:18 ` Nikita Karetnikov
2013-01-05 19:20 ` Ludovic Courtès
2013-01-09 19:04 ` Nikita Karetnikov
2013-01-10 15:01 ` Nikita Karetnikov
2013-01-10 22:26 ` Ludovic Courtès
2013-01-11 5:48 ` Nikita Karetnikov
2013-01-11 13:39 ` Ludovic Courtès
2013-01-12 21:03 ` Nikita Karetnikov
2013-01-13 20:40 ` Ludovic Courtès
2013-01-16 21:34 ` Nikita Karetnikov
2013-01-17 21:47 ` Ludovic Courtès
2013-01-21 5:50 ` Nikita Karetnikov
2013-01-22 21:37 ` Ludovic Courtès
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