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Re: updating list of substitutes
From: |
Ludovic Courtès |
Subject: |
Re: updating list of substitutes |
Date: |
Thu, 23 Apr 2015 11:52:10 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.5 (gnu/linux) |
Andreas Enge <address@hidden> skribis:
> On Wed, Apr 22, 2015 at 01:46:35PM +0200, Pjotr Prins wrote:
>> 5. We reload the list of substitutes after a fixed time
>> Let me rephrase. Can we have a more lazy approach towards fetching
>> substitutes? Rather than a fixed TTL we could fetch the latest list on
>> the first failed substitute.
>
> A while ago, the list of substitutes was downloaded even when removing
> packages from a profile, which Ludovic fixed if I remember correctly.
Not really, see below.
> But even when installing, one may not need to download anything if the
> package is already in the store. So I think the following would be good:
> Determine the list of packages to be installed in a profile with "guix
> package" or to be built with "guix build". If they are all in the store,
> fine, otherwise, check the age of the list of substitutes and if it is
> to old, download it again.
This is correct, except it’s not just about packages explicitly
specified by the user: anytime the daemon is asked to build something,
it calls out to ‘guix substitute’, which tells it whether a substitute
is available for that thing.
‘guix substitute’ has a cache of what’s available, which it refreshes
when it gets too old (hence the “updating substitute list” message.)
‘guix package -r’ actually asks the daemon to build/download (if needed)
the Guile package that is used to create the new profile. If that Guile
package is missing, then it is built/downloaded.
HTH,
Ludo’.
- Re: updating list of substitutes, (continued)
- Re: updating list of substitutes, Pjotr Prins, 2015/04/21
- Re: updating list of substitutes, Andreas Enge, 2015/04/21
- Re: updating list of substitutes, Pjotr Prins, 2015/04/21
- Re: updating list of substitutes, Andreas Enge, 2015/04/21
- Re: updating list of substitutes, Pjotr Prins, 2015/04/21
- Re: updating list of substitutes, Mark H Weaver, 2015/04/22
- Re: updating list of substitutes, Pjotr Prins, 2015/04/22
- Re: updating list of substitutes, Andreas Enge, 2015/04/22
- Re: updating list of substitutes, Pjotr Prins, 2015/04/22
- Re: updating list of substitutes, Taylan Ulrich Bayırlı/Kammer, 2015/04/22
- Re: updating list of substitutes,
Ludovic Courtès <=