nixpkgs/pkgs/top-level/stage.nix

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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
##
, # Either null or an object in the form:
#
# {
# pkgsBuildBuild = ...;
# pkgsBuildHost = ...;
# pkgsBuildTarget = ...;
# pkgsHostHost = ...;
# # pkgsHostTarget skipped on purpose.
# pkgsTargetTarget ...;
# }
#
# These are references to adjacent bootstrapping stages. The more familiar
# `buildPackages` and `targetPackages` are defined in terms of them. If null,
# they are instead defined internally as the current stage. This allows us to
# avoid expensive splicing. `pkgsHostTarget` is skipped because it is always
# defined as the current stage.
adjacentPackages
, # 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 {
inherit lib config;
pkgs = self;
};
in res // {
stdenvAdapters = res;
};
trivialBuilders = self: super:
import ../build-support/trivial-builders.nix {
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inherit lib; inherit (self) stdenv stdenvNoCC; inherit (self.pkgsBuildHost.xorg) lndir;
inherit (self) runtimeShell;
};
stdenvBootstappingAndPlatforms = self: super: let
withFallback = thisPkgs:
(if adjacentPackages == null then self else thisPkgs)
// { recurseForDerivations = false; };
in {
# Here are package sets of from related stages. They are all in the form
# `pkgs{theirHost}{theirTarget}`. For example, `pkgsBuildHost` means their
# host platform is our build platform, and their target platform is our host
# platform. We only care about their host/target platforms, not their build
# platform, because the the former two alone affect the interface of the
# final package; the build platform is just an implementation detail that
# should not leak.
pkgsBuildBuild = withFallback adjacentPackages.pkgsBuildBuild;
pkgsBuildHost = withFallback adjacentPackages.pkgsBuildHost;
pkgsBuildTarget = withFallback adjacentPackages.pkgsBuildTarget;
pkgsHostHost = withFallback adjacentPackages.pkgsHostHost;
pkgsHostTarget = self // { recurseForDerivations = false; }; # always `self`
pkgsTargetTarget = withFallback adjacentPackages.pkgsTargetTarget;
# Older names for package sets. Use these when only the host platform of the
# package set matter (i.e. use `buildPackages` where any of `pkgsBuild*`
# would do, and `targetPackages` when any of `pkgsTarget*` would do (if we
# had more than just `pkgsTargetTarget`).)
buildPackages = self.pkgsBuildHost;
pkgs = self.pkgsHostTarget;
targetPackages = self.pkgsTargetTarget;
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 (adjacentPackages != null);
top-level: Introduce `buildPackages` for resolving build-time deps [N.B., this package also applies to the commits that follow it in the same PR.] In most cases, buildPackages = pkgs so things work just as before. For cross compiling, however, buildPackages is resolved as the previous bootstrapping stage. This allows us to avoid the mkDerivation hacks cross compiling currently uses today. To avoid a massive refactor, callPackage will splice together both package sets. Again to avoid churn, it uses the old `nativeDrv` vs `crossDrv` to do so. So now, whether cross compiling or not, packages with get a `nativeDrv` and `crossDrv`---in the non-cross-compiling case they are simply the same derivation. This is good because it reduces the divergence between the cross and non-cross dataflow. See `pkgs/top-level/splice.nix` for a comment along the lines of the preceding paragraph, and the code that does this splicing. Also, `forceNativeDrv` is replaced with `forceNativePackages`. The latter resolves `pkgs` unless the host platform is different from the build platform, in which case it resolves to `buildPackages`. Note that the target platform is not important here---it will not prevent `forcedNativePackages` from resolving to `pkgs`. -------- Temporarily, we make preserve some dubious decisions in the name of preserving hashes: Most importantly, we don't distinguish between "host" and "target" in the autoconf sense. This leads to the proliferation of *Cross derivations currently used. What we ought to is resolve native deps of the cross "build packages" (build = host != target) package set against the "vanilla packages" (build = host = target) package set. Instead, "build packages" uses itself, with (informally) target != build in all cases. This is wrong because it violates the "sliding window" principle of bootstrapping stages that shifting the platform triple of one stage to the left coincides with the next stage's platform triple. Only because we don't explicitly distinguish between "host" and "target" does it appear that the "sliding window" principle is preserved--indeed it is over the reductionary "platform double" of just "build" and "host/target". Additionally, we build libc, libgcc, etc in the same stage as the compilers themselves, which is wrong because they are used at runtime, not build time. Fixing this is somewhat subtle, and the solution and problem will be better explained in the commit that does fix it. Commits after this will solve both these issues, at the expense of breaking cross hashes. Native hashes won't be broken, thankfully. -------- Did the temporary ugliness pan out? Of the packages that currently build in `release-cross.nix`, the only ones that have their hash changed are `*.gcc.crossDrv` and `bootstrapTools.*.coreutilsMinimal`. In both cases I think it doesn't matter. 1. GCC when doing a `build = host = target = foreign` build (maximally cross), still defines environment variables like `CPATH`[1] with packages. This seems assuredly wrong because whether gcc dynamically links those, or the programs built by gcc dynamically link those---I have no idea which case is reality---they should be foreign. Therefore, in all likelihood, I just made the gcc less broken. 2. Coreutils (ab)used the old cross-compiling infrastructure to depend on a native version of itself. When coreutils was overwritten to be built with fewer features, the native version it used would also be overwritten because the binding was tight. Now it uses the much looser `BuildPackages.coreutils` which is just fine as a richer build dep doesn't cause any problems and avoids a rebuild. So, in conclusion I'd say the conservatism payed off. Onward to actually raking the muck in the next PR! [1]: https://gcc.gnu.org/onlinedocs/gcc/Environment-Variables.html
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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: {
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# This maps each entry in lib.systems.examples to its own package
# set. Each of these will contain all packages cross compiled for
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# that target system. For instance, pkgsCross.raspberryPi.hello,
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# will refer to the "hello" package built for the ARM6-based
# Raspberry Pi.
pkgsCross = lib.mapAttrs (n: crossSystem:
nixpkgsFun { inherit crossSystem; })
lib.systems.examples;
pkgsLLVM = nixpkgsFun {
overlays = [
(self': super': {
pkgsLLVM = super';
})
] ++ overlays;
# Bootstrap a cross stdenv using the LLVM toolchain.
# This is currently not possible when compiling natively,
# so we don't need to check hostPlatform != buildPlatform.
crossSystem = stdenv.hostPlatform // {
useLLVM = true;
linker = "lld";
};
};
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# 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;
${if stdenv.hostPlatform == stdenv.buildPlatform
then "localSystem" else "crossSystem"} = {
parsed = stdenv.hostPlatform.parsed // {
abi = {
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gnu = lib.systems.parse.abis.musl;
gnueabi = lib.systems.parse.abis.musleabi;
gnueabihf = lib.systems.parse.abis.musleabihf;
}.${stdenv.hostPlatform.parsed.abi.name}
or lib.systems.parse.abis.musl;
};
};
} else throw "Musl libc only supports Linux systems.";
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# 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;
${if stdenv.hostPlatform == stdenv.buildPlatform
then "localSystem" else "crossSystem"} = {
parsed = stdenv.hostPlatform.parsed // {
cpu = lib.systems.parse.cpuTypes.i686;
};
};
} else throw "i686 Linux package set can only be used with the x86 family.";
# Extend the package set with zero or more overlays. This preserves
# preexisting overlays. Prefer to initialize with the right overlays
# in one go when calling Nixpkgs, for performance and simplicity.
appendOverlays = extraOverlays:
if extraOverlays == []
then self
else import ./stage.nix (args // { overlays = args.overlays ++ extraOverlays; });
# NOTE: each call to extend causes a full nixpkgs rebuild, adding ~130MB
# of allocations. DO NOT USE THIS IN NIXPKGS.
#
# Extend the package set with a single overlay. This preserves
# preexisting overlays. Prefer to initialize with the right overlays
# in one go when calling Nixpkgs, for performance and simplicity.
# Prefer appendOverlays if used repeatedly.
extend = f: self.appendOverlays [f];
# Fully static packages.
# Currently uses Musl on Linux (couldnt get static glibc to work).
pkgsStatic = nixpkgsFun ({
overlays = [ (self': super': {
pkgsStatic = super';
})] ++ overlays;
crossOverlays = [ (import ./static.nix) ];
} // lib.optionalAttrs stdenv.hostPlatform.isLinux {
crossSystem = {
isStatic = true;
parsed = stdenv.hostPlatform.parsed // {
abi = {
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gnu = lib.systems.parse.abis.musl;
gnueabi = lib.systems.parse.abis.musleabi;
gnueabihf = lib.systems.parse.abis.musleabihf;
musleabi = lib.systems.parse.abis.musleabi;
musleabihf = lib.systems.parse.abis.musleabihf;
}.${stdenv.hostPlatform.parsed.abi.name}
or lib.systems.parse.abis.musl;
};
} // lib.optionalAttrs (stdenv.hostPlatform.system == "powerpc64-linux") {
gcc.abi = "elfv2";
};
});
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};
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# 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
top-level: Introduce `buildPackages` for resolving build-time deps [N.B., this package also applies to the commits that follow it in the same PR.] In most cases, buildPackages = pkgs so things work just as before. For cross compiling, however, buildPackages is resolved as the previous bootstrapping stage. This allows us to avoid the mkDerivation hacks cross compiling currently uses today. To avoid a massive refactor, callPackage will splice together both package sets. Again to avoid churn, it uses the old `nativeDrv` vs `crossDrv` to do so. So now, whether cross compiling or not, packages with get a `nativeDrv` and `crossDrv`---in the non-cross-compiling case they are simply the same derivation. This is good because it reduces the divergence between the cross and non-cross dataflow. See `pkgs/top-level/splice.nix` for a comment along the lines of the preceding paragraph, and the code that does this splicing. Also, `forceNativeDrv` is replaced with `forceNativePackages`. The latter resolves `pkgs` unless the host platform is different from the build platform, in which case it resolves to `buildPackages`. Note that the target platform is not important here---it will not prevent `forcedNativePackages` from resolving to `pkgs`. -------- Temporarily, we make preserve some dubious decisions in the name of preserving hashes: Most importantly, we don't distinguish between "host" and "target" in the autoconf sense. This leads to the proliferation of *Cross derivations currently used. What we ought to is resolve native deps of the cross "build packages" (build = host != target) package set against the "vanilla packages" (build = host = target) package set. Instead, "build packages" uses itself, with (informally) target != build in all cases. This is wrong because it violates the "sliding window" principle of bootstrapping stages that shifting the platform triple of one stage to the left coincides with the next stage's platform triple. Only because we don't explicitly distinguish between "host" and "target" does it appear that the "sliding window" principle is preserved--indeed it is over the reductionary "platform double" of just "build" and "host/target". Additionally, we build libc, libgcc, etc in the same stage as the compilers themselves, which is wrong because they are used at runtime, not build time. Fixing this is somewhat subtle, and the solution and problem will be better explained in the commit that does fix it. Commits after this will solve both these issues, at the expense of breaking cross hashes. Native hashes won't be broken, thankfully. -------- Did the temporary ugliness pan out? Of the packages that currently build in `release-cross.nix`, the only ones that have their hash changed are `*.gcc.crossDrv` and `bootstrapTools.*.coreutilsMinimal`. In both cases I think it doesn't matter. 1. GCC when doing a `build = host = target = foreign` build (maximally cross), still defines environment variables like `CPATH`[1] with packages. This seems assuredly wrong because whether gcc dynamically links those, or the programs built by gcc dynamically link those---I have no idea which case is reality---they should be foreign. Therefore, in all likelihood, I just made the gcc less broken. 2. Coreutils (ab)used the old cross-compiling infrastructure to depend on a native version of itself. When coreutils was overwritten to be built with fewer features, the native version it used would also be overwritten because the binding was tight. Now it uses the much looser `BuildPackages.coreutils` which is just fine as a richer build dep doesn't cause any problems and avoids a rebuild. So, in conclusion I'd say the conservatism payed off. Onward to actually raking the muck in the next PR! [1]: https://gcc.gnu.org/onlinedocs/gcc/Environment-Variables.html
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splice
allPackages
otherPackageSets
aliases
configOverrides
] ++ overlays ++ [
stdenvOverrides ]);
in
# Return the complete set of packages.
lib.fix toFix