I wonder in other programming languages, name clashes are usually resolved through aliasing. Would it be possible for nix to install packages while aliasing their outputs to a different name to avoid clashes like this?
On 17 Jun 2017 09:07, "Roni Choudhury" <aicho...@gmail.com> wrote: > From time to time I see an error message like this: > > collision between > ‘/nix/store/qs8fq5ld2shc0i3fvbs6n0g0k8fypndm-git-2.13.0/bin/git’ and > ‘/nix/store/64fjdb4whkf2r5x8xyqf9kkljnk6w59b-git-2.13.0/bin/git’; use > ‘nix-env --set-flag priority NUMBER PKGNAME’ to change the priority of one of > the conflicting packages > > I understand what causes it (two packages competing to place the same, > e.g., binaries in my profile), but I’ve never understood how to resolve it. > Usually I just guess priority numbers until it works; more lately I’ve > simply removed the offending package from my environment before repeating > the failing install command. Obviously, neither approach is healthy or > correct :) > > The man page for nix-env contains the following: > > If there are multiple derivations matching a name in args that have the > same name (e.g., gcc-3.3.6 and gcc-4.1.1), then the derivation with the > highest priority is used. A derivation can define a priority by declaring > the meta.priority attribute. This attribute should be a number, with a > higher value denoting a lower priority. The default priority is 0. > > But I’m still not sure what this means for my error situation. How do I > know what the priorities are for the different packages? The default value > is 0, which is the highest priority; what does that mean exactly, for the > default priority to be the highest priority? > > Is there a more intuitive way to resolve this sort of conflict? For > instance, is there a way to tell nix-env to force the issue by treating > the requested package as higher priority than any existing ones? > > Thanks! > > roni > > > _______________________________________________ > nix-dev mailing list > nix-dev@lists.science.uu.nl > https://mailman.science.uu.nl/mailman/listinfo/nix-dev > >
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