Hi Alexander, On 08/29/2012 05:27 AM, Alexander Foremny wrote: > Hello list, > > I am currently trying to create a Nix expression for plowshare [1]. I > got a working version [2] already, since installation is quite > straight forward. However, as mentioned in the pull request I am > worrying about purity. > > In particular the Bash script calls the curl binary. The first > observation is that running one of plowshare's executables the curl > binary is being found correctly. I think this is because curl is > available in my PATH. > >> $ which curl >> ~/.nix-profile/bin/curl > I would have expected that this wouldn't be the case if I had removed > curl from my environment. However, the following still yields the same > result. > >> $ nix-env -e curl >> $ which curl >> ~/.nix-profile/bin/curl > This also arises in a newly created shell and I can also execute the > curl binary. I am guessing that curl is some kind of NixOS' standard > environment. Is this correct? > > Is it considered an impurity that plowshare finds curl without > depending on curl's derivation? If this is the case, is this impurity > introduced by NixOS or by the Nix expression?
It's an impurity in plowshare's nix expression. > If this is an issue, how would I solve it? Should I patch plowshare's > Bash scripts to refer to the curl's derivation instead of `which > curl`? Or even better, is there a wrapper for this kind of programs > already? wrapProgram (available if you add makeWrapper to buildInputs) is probably what you want. An example of how it can be used is at https://github.com/NixOS/nixpkgs/blob/master/pkgs/applications/taxes/aangifte-2011/default.nix#L30 > Regards, > Alexander Foremny > > [1] http://code.google.com/p/plowshare/ > [2] https://github.com/NixOS/nixpkgs/pull/117 > _______________________________________________ > nix-dev mailing list > [email protected] > http://lists.science.uu.nl/mailman/listinfo/nix-dev _______________________________________________ nix-dev mailing list [email protected] http://lists.science.uu.nl/mailman/listinfo/nix-dev
