[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: guix-package --roll-back
From: |
Ludovic Courtès |
Subject: |
Re: guix-package --roll-back |
Date: |
Sun, 13 Jan 2013 21:40:58 +0100 |
User-agent: |
Gnus/5.130005 (Ma Gnus v0.5) Emacs/24.2 (gnu/linux) |
Nikita Karetnikov <address@hidden> skribis:
>> It actually does, but it has no side effect.
>
> I know that printing is a side effect. Why do you recommend to use
> 'alist-cons'? If it's not possible to display anything, then
> 'roll-back' won't be able to print the following messages.
It’s just the /option handler/ (the procedure passed to SRFI-37
‘option’) that should not print anything. It is then OK to print
things, of course, like is done for other options.
Check how the other options are handled: during ‘args-fold’, the option
handler just adds to RESULT an element saying that this option was
passed. Once ‘args-fold’ has completed, we check its result: if it
contains a pair whose key is ‘install’, then it means we want to install
something, and so on.
>> When ‘--profile’ is passed, the result of ‘parse-options’ contains a
>> pair whose key is ‘profile’. The (assoc-ref opts 'profile) calls that
>> you see retrieve the argument given to ‘--profile’.
>
> It's clear. But where should I call (assoc-ref opts 'profile)? Should
> I do it in 'process-query'?
In ‘process-actions’ more precisely, because roll-back is an action, not
a query. And ‘process-actions’ already does that.
HTH,
Ludo’.
- Re: guix-package --roll-back, (continued)
- Re: guix-package --roll-back, Nikita Karetnikov, 2013/01/03
- Re: guix-package --roll-back, Ludovic Courtès, 2013/01/03
- Re: guix-package --roll-back, Nikita Karetnikov, 2013/01/04
- Re: guix-package --roll-back, Ludovic Courtès, 2013/01/05
- Re: guix-package --roll-back, Nikita Karetnikov, 2013/01/09
- Re: guix-package --roll-back, Nikita Karetnikov, 2013/01/10
- Re: guix-package --roll-back, Ludovic Courtès, 2013/01/10
- Re: guix-package --roll-back, Nikita Karetnikov, 2013/01/11
- Re: guix-package --roll-back, Ludovic Courtès, 2013/01/11
- Re: guix-package --roll-back, Nikita Karetnikov, 2013/01/12
- Re: guix-package --roll-back,
Ludovic Courtès <=
- Re: guix-package --roll-back, Nikita Karetnikov, 2013/01/16
- Re: guix-package --roll-back, Ludovic Courtès, 2013/01/17
- Re: guix-package --roll-back, Nikita Karetnikov, 2013/01/21
- Re: guix-package --roll-back, Ludovic Courtès, 2013/01/22