Hello Shea, thank you very much for your response! I modified my Nix expression [1]. Is this correct?
Is there a way to test if things are actually working? Apparently I cannot remove curl from my profile. > $ nix-env -e curl > $ curl --help > Usage: curl [options...] <url> > ... The commands above prints curl's help text which I did not expect. Regards, Alexander Foremny [1] https://github.com/aforemny/nixpkgs/blob/aed5c366944b98624411c5551f2d43becafdf44d/pkgs/tools/misc/plowshare/default.nix 2012/8/29 Shea Levy <[email protected]>: > 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
