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53 lines
1.8 KiB
Nix
53 lines
1.8 KiB
Nix
/* Impure default args for `pkgs/top-level/default.nix`. See that file
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for the meaning of each argument. */
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with builtins;
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let
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homeDir = builtins.getEnv "HOME";
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# Return ‘x’ if it evaluates, or ‘def’ if it throws an exception.
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try = x: def: let res = tryEval x; in if res.success then res.value else def;
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in
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{ # Fallback: Assume we are building packages for the current (host, in GNU
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# Autotools parlance) system.
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system ? builtins.currentSystem
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, # Fallback: The contents of the configuration file found at $NIXPKGS_CONFIG or
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# $HOME/.config/nixpkgs/config.nix.
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config ? let
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configFile = getEnv "NIXPKGS_CONFIG";
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configFile2 = homeDir + "/.config/nixpkgs/config.nix";
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configFile3 = homeDir + "/.nixpkgs/config.nix"; # obsolete
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in
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if configFile != "" && pathExists configFile then import configFile
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else if homeDir != "" && pathExists configFile2 then import configFile2
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else if homeDir != "" && pathExists configFile3 then import configFile3
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else {}
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, # Overlays are used to extend Nixpkgs collection with additional
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# collections of packages. These collection of packages are part of the
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# fix-point made by Nixpkgs.
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overlays ? let
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dirPath = try (if pathExists <nixpkgs-overlays> then <nixpkgs-overlays> else "") "";
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dirHome = homeDir + "/.config/nixpkgs/overlays";
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dirCheck = dir: dir != "" && pathExists (dir + "/.");
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overlays = dir:
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let content = readDir dir; in
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map (n: import (dir + ("/" + n)))
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(builtins.filter (n: builtins.match ".*\.nix" n != null)
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(attrNames content));
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in
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if dirPath != "" then
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overlays dirPath
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else if dirCheck dirHome then overlays dirHome
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else []
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, ...
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} @ args:
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import ./. (args // { inherit system config overlays; })
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