nixpkgs/pkgs/top-level/stage.nix
danbst f72903864d pkgsMusl, pkgsi686Linux, pkgsStatic: fix infinite recursion with overlays
Consider example:

$ nix-instantiate ./nixos -A system --arg configuration '
    {
      boot.isContainer = true;
      nixpkgs.overlays = [ (self: super: {
        nix = self.pkgsStatic.nix;
      }) ];
    }'

When resolving package through overlays, we figure out that

  nix == self.pkgsStatic.nix
  =>
  nix == (import <nixpkgs> { inherit overlays; }).nix
  =>
  nix == (import <nixpkgs> { overlays = [(self: super: { nix = self.pkgsStatic.nix; })];}).nix

and we enter infinite recursion of nixpkgs evaluations.

The proper fix should terminate recursion by assigning self fixpoint
to inner custom package set. But I get infinite recursion somehow, so
I use `super`. It is less correct modulo deep custom overrides, but behaves
correctly for simple cases and doesn't OOM evaluator.

Fixes https://github.com/NixOS/nixpkgs/issues/57984
2019-03-25 10:58:46 +02:00

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/* This file composes a single bootstrapping stage of the Nix Packages
collection. That is, it imports the functions that build the various
packages, and calls them with appropriate arguments. The result is a set of
all the packages in the Nix Packages collection for some particular platform
for some particular stage.
Default arguments are only provided for bootstrapping
arguments. Normal users should not import this directly but instead
import `pkgs/default.nix` or `default.nix`. */
{ ## Misc parameters kept the same for all stages
##
# Utility functions, could just import but passing in for efficiency
lib
, # Use to reevaluate Nixpkgs; a dirty hack that should be removed
nixpkgsFun
## Other parameters
##
, # The package set used at build-time. If null, `buildPackages` will
# be defined internally as the final produced package set itself. This allows
# us to avoid expensive splicing.
buildPackages
, # The package set used in the next stage. If null, `targetPackages` will be
# defined internally as the final produced package set itself, just like with
# `buildPackages` and for the same reasons.
#
# THIS IS A HACK for compilers that don't think critically about cross-
# compilation. Please do *not* use unless you really know what you are doing.
targetPackages
, # The standard environment to use for building packages.
stdenv
, # This is used because stdenv replacement and the stdenvCross do benefit from
# the overridden configuration provided by the user, as opposed to the normal
# bootstrapping stdenvs.
allowCustomOverrides
, # Non-GNU/Linux OSes are currently "impure" platforms, with their libc
# outside of the store. Thus, GCC, GFortran, & co. must always look for files
# in standard system directories (/usr/include, etc.)
noSysDirs ? stdenv.buildPlatform.system != "x86_64-freebsd"
&& stdenv.buildPlatform.system != "i686-freebsd"
&& stdenv.buildPlatform.system != "x86_64-solaris"
&& stdenv.buildPlatform.system != "x86_64-kfreebsd-gnu"
, # The configuration attribute set
config
, # A list of overlays (Additional `self: super: { .. }` customization
# functions) to be fixed together in the produced package set
overlays
} @args:
let
stdenvAdapters = self: super:
let res = import ../stdenv/adapters.nix self; in res // {
stdenvAdapters = res;
};
trivialBuilders = self: super:
import ../build-support/trivial-builders.nix {
inherit lib; inherit (self) stdenv stdenvNoCC; inherit (self.xorg) lndir;
inherit (self) runtimeShell;
};
stdenvBootstappingAndPlatforms = self: super: {
buildPackages = (if buildPackages == null then self else buildPackages)
// { recurseForDerivations = false; };
targetPackages = (if targetPackages == null then self else targetPackages)
// { recurseForDerivations = false; };
inherit stdenv;
};
# The old identifiers for cross-compiling. These should eventually be removed,
# and the packages that rely on them refactored accordingly.
platformCompat = self: super: let
inherit (super.stdenv) buildPlatform hostPlatform targetPlatform;
in {
inherit buildPlatform hostPlatform targetPlatform;
inherit (hostPlatform) system;
};
splice = self: super: import ./splice.nix lib self (buildPackages != null);
allPackages = self: super:
let res = import ./all-packages.nix
{ inherit lib noSysDirs config overlays; }
res self super;
in res;
aliases = self: super: lib.optionalAttrs (config.allowAliases or true) (import ./aliases.nix lib self super);
# stdenvOverrides is used to avoid having multiple of versions
# of certain dependencies that were used in bootstrapping the
# standard environment.
stdenvOverrides = self: super:
(super.stdenv.overrides or (_: _: {})) self super;
# Allow packages to be overridden globally via the `packageOverrides'
# configuration option, which must be a function that takes `pkgs'
# as an argument and returns a set of new or overridden packages.
# The `packageOverrides' function is called with the *original*
# (un-overridden) set of packages, allowing packageOverrides
# attributes to refer to the original attributes (e.g. "foo =
# ... pkgs.foo ...").
configOverrides = self: super:
lib.optionalAttrs allowCustomOverrides
((config.packageOverrides or (super: {})) super);
# Convenience attributes for instantitating package sets. Each of
# these will instantiate a new version of allPackages. Currently the
# following package sets are provided:
#
# - pkgsCross.<system> where system is a member of lib.systems.examples
# - pkgsMusl
# - pkgsi686Linux
otherPackageSets = self: super: {
# This maps each entry in lib.systems.examples to its own package
# set. Each of these will contain all packages cross compiled for
# that target system. For instance, pkgsCross.rasberryPi.hello,
# will refer to the "hello" package built for the ARM6-based
# Raspberry Pi.
pkgsCross = lib.mapAttrs (n: crossSystem:
nixpkgsFun { inherit crossSystem; })
lib.systems.examples;
# All packages built with the Musl libc. This will override the
# default GNU libc on Linux systems. Non-Linux systems are not
# supported.
pkgsMusl = if stdenv.hostPlatform.isLinux then nixpkgsFun {
overlays = [ (self': super': {
pkgsMusl = super';
})] ++ overlays;
${if stdenv.hostPlatform == stdenv.buildPlatform
then "localSystem" else "crossSystem"} = {
parsed = stdenv.hostPlatform.parsed // {
abi = {
"gnu" = lib.systems.parse.abis.musl;
"gnueabi" = lib.systems.parse.abis.musleabi;
"gnueabihf" = lib.systems.parse.abis.musleabihf;
}.${stdenv.hostPlatform.parsed.abi.name}
or lib.systems.parse.abis.musl;
};
};
} else throw "Musl libc only supports Linux systems.";
# All packages built for i686 Linux.
# Used by wine, firefox with debugging version of Flash, ...
pkgsi686Linux = if stdenv.hostPlatform.isLinux && stdenv.hostPlatform.isx86 then nixpkgsFun {
overlays = [ (self': super': {
pkgsi686Linux = super';
})] ++ overlays;
${if stdenv.hostPlatform == stdenv.buildPlatform
then "localSystem" else "crossSystem"} = {
parsed = stdenv.hostPlatform.parsed // {
cpu = lib.systems.parse.cpuTypes.i686;
};
};
} else throw "i686 Linux package set can only be used with the x86 family.";
# Extend the package set with zero or more overlays. This preserves
# preexisting overlays. Prefer to initialize with the right overlays
# in one go when calling Nixpkgs, for performance and simplicity.
appendOverlays = extraOverlays:
if extraOverlays == []
then self
else import ./stage.nix (args // { overlays = args.overlays ++ extraOverlays; });
# Extend the package set with a single overlay. This preserves
# preexisting overlays. Prefer to initialize with the right overlays
# in one go when calling Nixpkgs, for performance and simplicity.
# Prefer appendOverlays if used repeatedly.
extend = f: self.appendOverlays [f];
# Fully static packages.
# Currently uses Musl on Linux (couldnt get static glibc to work).
pkgsStatic = nixpkgsFun ({
overlays = [ (self': super': {
pkgsStatic = super';
})] ++ overlays;
crossOverlays = [ (import ./static.nix) ];
} // lib.optionalAttrs stdenv.hostPlatform.isLinux {
crossSystem = {
parsed = stdenv.hostPlatform.parsed // {
abi = {
"gnu" = lib.systems.parse.abis.musl;
"gnueabi" = lib.systems.parse.abis.musleabi;
"gnueabihf" = lib.systems.parse.abis.musleabihf;
}.${stdenv.hostPlatform.parsed.abi.name}
or lib.systems.parse.abis.musl;
};
};
});
};
# The complete chain of package set builders, applied from top to bottom.
# stdenvOverlays must be last as it brings package forward from the
# previous bootstrapping phases which have already been overlayed.
toFix = lib.foldl' (lib.flip lib.extends) (self: {}) ([
stdenvBootstappingAndPlatforms
platformCompat
stdenvAdapters
trivialBuilders
splice
allPackages
otherPackageSets
aliases
configOverrides
] ++ overlays ++ [
stdenvOverrides ]);
in
# Return the complete set of packages.
lib.fix toFix