Hi Bjørn Thanks a lot for your clear explanation!
Best regards Niklaus Am Dienstag, 6. Januar 2015, 22.12:55 schrieb Bjørn Forsman: > On 6 January 2015 at 21:29, Niklaus Giger <niklaus.gi...@member.fsf.org> wrote: > > Hi everybody > > > > Thanks to lwn pointing me to NixOS I decided to test drive using > > VirtualBox. I was quite impressed how much was available and how smooth > > my experience has been. > > Great! > > > I am puzzleed that runnig > > nix-env -i eclipse-sdk-4.4 > > works fine, but I was unable to add it /etc/nixos/configuration.nix with > > lines like > > { > > > > environment.systemPackages = > > > > [ pkgs.eclipse-sdk-4.4 > > > > ] > > > > } > > failed. > > > > Similarly I was surprised that nix-env -i kdepim needed a item called > > pkgs.kde4.kdepim in /etc/nixos/configuration.nix. > > > > Could anybody point give me an explanation or point me to where I find one > > for this behaviour? I did not find one under https://nixos.org/wiki/FAQ, > > http://nixos.org/nix/manual/ nor http://nixos.org/nixpkgs/manual/. > It's due to the fact that packages can be installed by "attribute > name" or "package name". nix-env -i installs by package name, nix-env > -iA and environment.systemPackages installs by attribute name. > > (Unfortunately I don't know a good reference to point to for a > description of this.) > > A comment above the environment.systemPackages line, in the > configuration.nix template created during installation, should at > least give you an example command for finding packages: "nix-env -qaP > > | grep wget" > > In general, we try to keep the package attribute equal to the package > name. Not so long ago, nix didn't support dashes in attribute names > (it confliced with the 'subtraction' operator), so there are packages > still using attribute names with camelCase or underscore instead of > dash. > > Also, some packages are grouped under "container attributes", like you > saw above ("kde4"). > > Just use "nix-env -qaP | grep wget" and you'll be OK. > > Best regards, > Bjørn Forsman _______________________________________________ nix-dev mailing list nix-dev@lists.science.uu.nl http://lists.science.uu.nl/mailman/listinfo/nix-dev