[Nix-dev] reading nix profile derivation priorities from manifest.nix

[Rommel Martinez]

Thanks, Marc! :)


On Sat, May 3, 2014 at 7:06 PM, Marc Weber <marco-oweber at gmx.de> wrote:

> Excerpts from Rommel Martinez's message of Sat May 03 09:46:00 +0000 2014:
> > Let's presume that I have run the command 'nix-env --set-flag priority
> ...'
> > many times and I have lost track of what they were, how can I "reset"
> > them to the default state?
>
> Following profile links to store, cp -L (dereferencing) them to /tmp and
> running diff -r shows:
>
> diff -r 11/manifest.nix 22/manifest.nix
> 1c1
> < [ { meta = { }; name = "nvi-1.79"; out = { outPath =
> "/nix/store/lcb2rbrhb183lbsxhk512d297ymv85j0-nvi-1.79"; }; outPath =
> "/nix/store/lcb2rbrhb183lbsxhk512d297ymv85j0-nvi-1.79"; outputs = [ "out"
> ]; type = "derivation"; } ]
> \ No newline at end of file
> ---
> > [ { meta = { priority = "20"; }; name = "nvi-1.79"; out = { outPath =
> "/nix/store/lcb2rbrhb183lbsxhk512d297ymv85j0-nvi-1.79"; }; outPath =
> "/nix/store/lcb2rbrhb183lbsxhk512d297ymv85j0-nvi-1.79"; outputs = [ "out"
> ]; system = "unknown"; type = "derivation"; } ]
> \ No newline at end of file
>
> Thus read ~/.nix-profile/manifest.nix
> How to change/reset? Does'nt look like nix-env provides a command (I
> might have missed it again).
>
> >From buildenv.nix (nix distribution): (d.meta.priority or 5)
> thus default priority is 5.
>
> Now from nix-env:
>        --meta
>            Print all of the meta-attributes of the derivation. This option
> is only available with --xml.
>
> Thus I'd suggest:
>
> nix-env -q --xml --meta
>
> and there it is:
>
>   <?xml version='1.0' encoding='utf-8'?>
>   <items>
>     <item attrPath="0" name="nvi-1.79" system="unknown">
>       <meta name="priority" type="string" value="20" />
>     </item>
>   </items>
>
> If you want to change something you at least have some pointers where/how
> to get started.
>
> I've changed the subject hoping that its easier for google to find this
> post in the future.
>
> Marc Weber
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> nix-dev at lists.science.uu.nl
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>



-- 
Rommel M. Martinez
http://rmm.meta.ph
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