92 lines
3.7 KiB
Nix
92 lines
3.7 KiB
Nix
|
/* Impure default args for `pkgs/top-level/default.nix`. See that file
|
|||
|
|
for the meaning of each argument. */
|
|||
|
|
|
|||
|
|
with builtins;
|
|||
|
|
|
|||
|
|
let
|
|||
|
|
|
|||
|
|
homeDir = builtins.getEnv "HOME";
|
|||
|
|
|
|||
|
|
# Return ‘x’ if it evaluates, or ‘def’ if it throws an exception.
|
|||
|
|
try = x: def: let res = tryEval x; in if res.success then res.value else def;
|
|||
|
|
|
|||
|
|
in
|
|||
|
|
|
|||
|
|
{ # We combine legacy `system` and `platform` into `localSystem`, if
|
|||
|
|
# `localSystem` was not passed. Strictly speaking, this is pure desugar, but
|
|||
|
|
# it is most convient to do so before the impure `localSystem.system` default,
|
|||
|
|
# so we do it now.
|
|||
|
|
localSystem ? builtins.intersectAttrs { system = null; platform = null; } args
|
|||
|
|
|
|||
|
|
, # These are needed only because nix's `--arg` command-line logic doesn't work
|
|||
|
|
# with unnamed parameters allowed by ...
|
|||
|
|
system ? localSystem.system
|
|||
|
|
, platform ? localSystem.platform
|
|||
|
|
, crossSystem ? null
|
|||
|
|
|
|||
|
|
, # Fallback: The contents of the configuration file found at $NIXPKGS_CONFIG or
|
|||
|
|
# $HOME/.config/nixpkgs/config.nix.
|
|||
|
|
config ? let
|
|||
|
|
configFile = getEnv "NIXPKGS_CONFIG";
|
|||
|
|
configFile2 = homeDir + "/.config/nixpkgs/config.nix";
|
|||
|
|
configFile3 = homeDir + "/.nixpkgs/config.nix"; # obsolete
|
|||
|
|
in
|
|||
|
|
if configFile != "" && pathExists configFile then import configFile
|
|||
|
|
else if homeDir != "" && pathExists configFile2 then import configFile2
|
|||
|
|
else if homeDir != "" && pathExists configFile3 then import configFile3
|
|||
|
|
else {}
|
|||
|
|
|
|||
|
|
, # Overlays are used to extend Nixpkgs collection with additional
|
|||
|
|
# collections of packages. These collection of packages are part of the
|
|||
|
|
# fix-point made by Nixpkgs.
|
|||
|
|
overlays ? let
|
|||
|
|
isDir = path: pathExists (path + "/.");
|
|||
|
|
pathOverlays = try (toString <nixpkgs-overlays>) "";
|
|||
|
|
homeOverlaysFile = homeDir + "/.config/nixpkgs/overlays.nix";
|
|||
|
|
homeOverlaysDir = homeDir + "/.config/nixpkgs/overlays";
|
|||
|
|
overlays = path:
|
|||
|
|
# check if the path is a directory or a file
|
|||
|
|
if isDir path then
|
|||
|
|
# it's a directory, so the set of overlays from the directory, ordered lexicographically
|
|||
|
|
let content = readDir path; in
|
|||
|
|
map (n: import (path + ("/" + n)))
|
|||
|
|
(builtins.filter (n: builtins.match ".*\\.nix" n != null || pathExists (path + ("/" + n + "/default.nix")))
|
|||
|
|
(attrNames content))
|
|||
|
|
else
|
|||
|
|
# it's a file, so the result is the contents of the file itself
|
|||
|
|
import path;
|
|||
|
|
in
|
|||
|
|
if pathOverlays != "" && pathExists pathOverlays then overlays pathOverlays
|
|||
|
|
else if pathExists homeOverlaysFile && pathExists homeOverlaysDir then
|
|||
|
|
throw ''
|
|||
|
|
Nixpkgs overlays can be specified with ${homeOverlaysFile} or ${homeOverlaysDir}, but not both.
|
|||
|
|
Please remove one of them and try again.
|
|||
|
|
''
|
|||
|
|
else if pathExists homeOverlaysFile then
|
|||
|
|
if isDir homeOverlaysFile then
|
|||
|
|
throw (homeOverlaysFile + " should be a file")
|
|||
|
|
else overlays homeOverlaysFile
|
|||
|
|
else if pathExists homeOverlaysDir then
|
|||
|
|
if !(isDir homeOverlaysDir) then
|
|||
|
|
throw (homeOverlaysDir + " should be a directory")
|
|||
|
|
else overlays homeOverlaysDir
|
|||
|
|
else []
|
|||
|
|
|
|||
|
|
, crossOverlays ? []
|
|||
|
|
|
|||
|
|
, ...
|
|||
|
|
} @ args:
|
|||
|
|
|
|||
|
|
# If `localSystem` was explicitly passed, legacy `system` and `platform` should
|
|||
|
|
# not be passed.
|
|||
|
|
assert args ? localSystem -> !(args ? system || args ? platform);
|
|||
|
|
|
|||
|
|
import ./. (builtins.removeAttrs args [ "system" "platform" ] // {
|
|||
|
|
inherit config overlays crossSystem crossOverlays;
|
|||
|
|
# Fallback: Assume we are building packages on the current (build, in GNU
|
|||
|
|
# Autotools parlance) system.
|
|||
|
|
localSystem = if builtins.isString localSystem then localSystem
|
|||
|
|
else (if args ? localSystem then {}
|
|||
|
|
else { system = builtins.currentSystem; }) // localSystem;
|
|||
|
|
})
|