39753f5360
This makes the flow of data easier to understand. There's little downside because the args in question are already inspected by the stdenvs. cross-compiling in particular is simpler because we don't need to worry about overriding the config closed over by `allPackages`.
85 lines
2.8 KiB
Nix
85 lines
2.8 KiB
Nix
/* This function composes the Nix Packages collection. It:
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1. Applies the final stage to the given `config` if it is a function
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2. Infers an appropriate `platform` based on the `system` if none is
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provided
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3. Defaults to no non-standard config and no cross-compilation target
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4. Uses the above to infer the default standard environment (stdenv) if
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none is provided
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5. Builds the final stage --- a fully booted package set with the chosen
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stdenv
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Use `impure.nix` to also infer the `system` based on the one on which
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evaluation is taking place, and the configuration from environment variables
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or dot-files. */
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{ # The system (e.g., `i686-linux') for which to build the packages.
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system
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, # Allow a configuration attribute set to be passed in as an argument.
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config ? {}
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, crossSystem ? null
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, platform ? null
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} @ args:
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let # Rename the function arguments
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configExpr = config;
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platform_ = platform;
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in let
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lib = import ../../lib;
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# Allow both:
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# { /* the config */ } and
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# { pkgs, ... } : { /* the config */ }
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config =
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if builtins.isFunction configExpr
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then configExpr { inherit pkgs; }
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else configExpr;
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# Allow setting the platform in the config file. Otherwise, let's use a reasonable default (pc)
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platformAuto = let
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platforms = (import ./platforms.nix);
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in
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if system == "armv6l-linux" then platforms.raspberrypi
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else if system == "armv7l-linux" then platforms.armv7l-hf-multiplatform
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else if system == "armv5tel-linux" then platforms.sheevaplug
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else if system == "mips64el-linux" then platforms.fuloong2f_n32
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else if system == "x86_64-linux" then platforms.pc64
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else if system == "i686-linux" then platforms.pc32
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else platforms.pcBase;
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platform = if platform_ != null then platform_
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else config.platform or platformAuto;
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# A few packages make a new package set to draw their dependencies from.
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# (Currently to get a cross tool chain, or forced-i686 package.) Rather than
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# give `all-packages.nix` all the arguments to this function, even ones that
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# don't concern it, we give it this function to "re-call" nixpkgs, inheriting
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# whatever arguments it doesn't explicitly provide. This way,
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# `all-packages.nix` doesn't know more than it needs too.
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#
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# It's OK that `args` doesn't include the defaults: they'll be
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# deterministically inferred the same way.
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nixpkgsFun = newArgs: import ./. (args // newArgs);
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# Partially apply some arguments for building bootstraping stage pkgs
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# sets. Only apply arguments which no stdenv would want to override.
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allPackages = newArgs: import ./stage.nix ({
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inherit lib nixpkgsFun;
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} // newArgs);
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stdenv = import ../stdenv {
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inherit lib allPackages system platform crossSystem config;
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};
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pkgs = allPackages { inherit system stdenv config crossSystem platform; };
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in pkgs
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