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$NIXPKGS_OVERLAYS -> <nixpkgs-overlays>

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The Nix search path is the established mechanism for specifying the
location of Nix expressions, so let's use it instead of adding another
environment variable.
This commit is contained in:
Eelco Dolstra 2017-02-01 15:56:02 +01:00
parent 86fe7a40ac
commit 7dacca324d
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GPG Key ID: 8170B4726D7198DE
2 changed files with 18 additions and 13 deletions
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4
doc/overlays.xml
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@ -28,8 +28,8 @@ first one present is considered, and all the rest are ignored:
<listitem>
<para>In the directory pointed by the environment variable
<varname>NIXPKGS_OVERLAYS</varname>.</para>
<para>In the directory pointed to by the Nix search path entry
<literal>&lt;nixpkgs-overlays></literal>.</para>
</listitem>
<listitem>

27
pkgs/top-level/impure.nix
View File

@ -1,6 +1,17 @@
/* 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
{ # Fallback: Assume we are building packages for the current (host, in GNU
# Autotools parlance) system.
system ? builtins.currentSystem
@ -8,10 +19,7 @@
, # Fallback: The contents of the configuration file found at $NIXPKGS_CONFIG or
# $HOME/.nixpkgs/config.nix.
config ? let
inherit (builtins) getEnv pathExists;
configFile = getEnv "NIXPKGS_CONFIG";
homeDir = getEnv "HOME";
configFile2 = homeDir + "/.nixpkgs/config.nix";
in
if configFile != "" && pathExists configFile then import configFile
@ -22,20 +30,17 @@
# collections of packages. These collection of packages are part of the
# fix-point made by Nixpkgs.
overlays ? let
inherit (builtins) getEnv pathExists readDir attrNames map sort
lessThan;
dirEnv = getEnv "NIXPKGS_OVERLAYS";
dirHome = (getEnv "HOME") + "/.nixpkgs/overlays";
dirPath = try (if pathExists <nixpkgs-overlays> then <nixpkgs-overlays> else "") "";
dirHome = homeDir + "/.nixpkgs/overlays";
dirCheck = dir: dir != "" && pathExists (dir + "/.");
overlays = dir:
let content = readDir dir; in
map (n: import "${dir}/${n}")
map (n: import (dir + ("/" + n)))
(builtins.filter (n: builtins.match ".*\.nix" n != null)
(sort lessThan (attrNames content)));
in
if dirEnv != "" then
if dirCheck dirEnv then overlays dirEnv
else throw "The environment variable NIXPKGS_OVERLAYS does not name a valid directory."
if dirPath != "" then
overlays dirPath
else if dirCheck dirHome then overlays dirHome
else []