I noticed dry-run building stuff, but I'm using replaceDependency.
ReplaceDepenency does the unusual step of importing a .nix file that is
generated by a runCommand expression which I believe is indirectly calling
nix-build via the exportReferencesGraph feature. This is why I think
dry-run causes nix-build commands with replaceDependency; evaluation of
the nix-expression's import requires running nix-build.
That is my theory anyway.
On Mon, 29 Sep 2014, Ricardo M. Correia wrote:
Shea: I wasn't even using replaceDependency... and dry-run started
compiling/downloading anyway, like if I had done a switch.
Isn't this happening to anyone else who is using a recent commit from the
unstable/master channel?
On Mon, Sep 29, 2014 at 2:12 AM, Shea Levy <[email protected]> wrote:
The dry-run thing is likely due to replaceDependency doing an import
from a derivation, which requires building at evaluation time. There's
not really a good way to work around that, unfortunately.
~Shea
On Mon, Sep 29, 2014 at 12:52:10AM +0200, Ricardo M. Correia wrote:
> On Sun, Sep 28, 2014 at 10:19 AM, Vladimír Čunát <[email protected]>
wrote:
>
> > On 09/25/2014 03:41 PM, Ricardo M. Correia wrote:
> >
> >> Also, I'm not sure if this is expected, but when I first tried to run
> >> "nixos-rebuild dry-run" with this workaround applied, it started to
> >> download and compile bash even though the man page of nixos-rebuild
> >> specifically says: [...]
> >>
> >
> > IIRC there are two steps -- first build nix, and then do the dry-run
(or
> > switch or anything else). Nix also needs its bash replaced, so first
you
> > need to build the bash replacement. That is, unless you specify
> > --no-build-nix option.
> >
>
> That's what I thought too after reflecting on it a bit more, but now I'm
> starting to think that there is a real bug.
>
> I just tried to run "nixos-rebuild dry-run" (in preparation for testing
> roconner's performance improvement) and it started to compile
rustcMaster!
> (I'm pretty sure that is not a dependency of nix).
> I expected it to do that if I ran "nixos-rebuild switch" or
"nixos-rebuild
> boot" because I changed it locally, but I didn't expect it to compile
when
> running "nixos-rebuild dry-run".
>
> For reference, I am currently running on
> e2d06c45b4586203a1838098460ec0a5781c8cf8 (from about 3 days ago).
> _______________________________________________
> nix-dev mailing list
> [email protected]
> http://lists.science.uu.nl/mailman/listinfo/nix-dev
--
Russell O'Connor <http://r6.ca/>
``All talk about `theft,''' the general counsel of the American Graphophone
Company wrote, ``is the merest claptrap, for there exists no property in
ideas musical, literary or artistic, except as defined by statute.''
_______________________________________________
nix-dev mailing list
[email protected]
http://lists.science.uu.nl/mailman/listinfo/nix-dev
