Re: [Nix-dev] Confused about packages
Excerpts from Roger Qiu's message of Tue May 19 05:56:30 + 2015:
> Wouldn't it be better for version numbers to always exist?
You're totally right that the
mkDerivation {
name ="name-"
}
version should always exist. Thus if you find cases just create a topic
branch, fix, and submit once in a while.
I was quite surprised that "mysql" in all-packages.nix started pointing
to mariadb which broke my ruby overlay because headers were not found.
Thus what can you do?
there is builtins.compareVersions function, and there are "nixos" module
assertions - thus you could ensure this way that compareVersion
pkgs.mysql equals "5.0" or so - or you could just add a constraint
mysql.name = "mysql-5.0" which would fail building.
You always "know" the version as long as you're using the same nixpkgs
revision - but sometimes you have to update - and then adding such nixos
assertios would be close to what you want. Just grep nixpkgs/nixos for
assertions to see samples.
However usually upgrades "just happen to work fine" - in the end testing
for versions doesn't protect you from mal functioning (eg a dependency
could have changed) - thus what you really want is writing tests.
There are some samples in the nixpgks repository as well.
Marc Weber
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Re: [Nix-dev] Confused about packages
Wouldn't it be better for version numbers to always exist? That way it's simple to know the exact version of your package that you're installing, even if it's just one package. I'd prefer for it not to be random. On 16/05/2015 7:27 AM, Vladimír Čunát wrote: Hi. On 05/15/2015 11:09 PM, Amy de Buitléir wrote: Q 1. Why do some packages have version numbers, and some don't? Are the ones without version numbers some sort of "virtual" package? Missing version should be considered a bug, I believe, at least in most cases. I versioned dmenu2 in d41798321. Q 2. Why can't I find some packages that I would expect to find? Are they "hidden"? For example, I have the following in my /etc/nixos/configuration.nix: environment.systemPackages = with pkgs; [ dmenu2 dzen2 haskellPackages.xmonad haskellPackages.xmonadContrib haskellPackages.xmonadExtras wget xsel ]; But if someone hadn't told me the names to put there, how could I have found the names of the packages? Searching for them using nix-env didn't find them: I consider that a bug, too. Peti: I guess this would be because of haskellPackages missing recurseIntoAttrs. I can't see it in there and no haskell packages are shown for me on master. Vladimir ___ nix-dev mailing list nix-dev@lists.science.uu.nl http://lists.science.uu.nl/mailman/listinfo/nix-dev -- Founder of Matrix AI http://matrix.ai/ +61420925975 ___ nix-dev mailing list nix-dev@lists.science.uu.nl http://lists.science.uu.nl/mailman/listinfo/nix-dev
Re: [Nix-dev] Confused about packages
Hi. On 05/15/2015 11:09 PM, Amy de Buitléir wrote: > Q 1. Why do some packages have version numbers, and some don't? Are the ones > without version numbers some sort of "virtual" package? Missing version should be considered a bug, I believe, at least in most cases. I versioned dmenu2 in d41798321. > Q 2. Why can't I find some packages that I would expect to find? Are they > "hidden"? For example, I have the following in my > /etc/nixos/configuration.nix: > > environment.systemPackages = with pkgs; [ > dmenu2 > dzen2 > haskellPackages.xmonad > haskellPackages.xmonadContrib > haskellPackages.xmonadExtras > wget > xsel > ]; > > But if someone hadn't told me the names to put there, how could I have found > the names of the packages? Searching for them using nix-env didn't find them: I consider that a bug, too. Peti: I guess this would be because of haskellPackages missing recurseIntoAttrs. I can't see it in there and no haskell packages are shown for me on master. Vladimir smime.p7s Description: S/MIME Cryptographic Signature ___ nix-dev mailing list nix-dev@lists.science.uu.nl http://lists.science.uu.nl/mailman/listinfo/nix-dev
Re: [Nix-dev] Confused about packages
> [ with and without version numbers ] Version numbers get added if people find that there is need to keep multiple versions. Thus its kind of random > where / how to find package names See https://nixos.org/wiki/Howto_find_a_package_in_NixOS Marc Weber ___ nix-dev mailing list nix-dev@lists.science.uu.nl http://lists.science.uu.nl/mailman/listinfo/nix-dev
