mirror of
https://github.com/NixOS/nixpkgs.git
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f5dfe78a1e
This patch add a new argument to Nixpkgs default expression named "overlays".
By default, the value of the argument is either taken from the environment variable `NIXPKGS_OVERLAYS`,
or from the directory `~/.nixpkgs/overlays/`. If the environment variable does not name a valid directory
then this mechanism would fallback on the home directory. If the home directory does not exists it will
fallback on an empty list of overlays.
The overlays directory should contain the list of extra Nixpkgs stages which would be used to extend the
content of Nixpkgs, with additional set of packages. The overlays, i-e directory, files, symbolic links
are used in alphabetical order.
The simplest overlay which extends Nixpkgs with nothing looks like:
```nix
self: super: {
}
```
More refined overlays can use `super` as the basis for building new packages, and `self` as a way to query
the final result of the fix-point.
An example of overlay which extends Nixpkgs with a small set of packages can be found at:
https://github.com/nbp/nixpkgs-mozilla/blob/nixpkgs-overlay/moz-overlay.nix
To use this file, checkout the repository and add a symbolic link to
the `moz-overlay.nix` file in `~/.nixpkgs/overlays` directory.
297 lines
10 KiB
Nix
297 lines
10 KiB
Nix
# This file constructs the standard build environment for the
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# Linux/i686 platform. It's completely pure; that is, it relies on no
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# external (non-Nix) tools, such as /usr/bin/gcc, and it contains a C
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# compiler and linker that do not search in default locations,
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# ensuring purity of components produced by it.
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{ lib
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, system, platform, crossSystem, config, overlays
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, bootstrapFiles ?
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if system == "i686-linux" then import ./bootstrap-files/i686.nix
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else if system == "x86_64-linux" then import ./bootstrap-files/x86_64.nix
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else if system == "armv5tel-linux" then import ./bootstrap-files/armv5tel.nix
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else if system == "armv6l-linux" then import ./bootstrap-files/armv6l.nix
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else if system == "armv7l-linux" then import ./bootstrap-files/armv7l.nix
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else if system == "mips64el-linux" then import ./bootstrap-files/loongson2f.nix
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else abort "unsupported platform for the pure Linux stdenv"
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}:
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assert crossSystem == null;
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let
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commonPreHook =
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''
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export NIX_ENFORCE_PURITY="''${NIX_ENFORCE_PURITY-1}"
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export NIX_ENFORCE_NO_NATIVE="''${NIX_ENFORCE_NO_NATIVE-1}"
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${if system == "x86_64-linux" then "NIX_LIB64_IN_SELF_RPATH=1" else ""}
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${if system == "mips64el-linux" then "NIX_LIB32_IN_SELF_RPATH=1" else ""}
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'';
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# The bootstrap process proceeds in several steps.
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# Create a standard environment by downloading pre-built binaries of
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# coreutils, GCC, etc.
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# Download and unpack the bootstrap tools (coreutils, GCC, Glibc, ...).
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bootstrapTools = import ./bootstrap-tools { inherit system bootstrapFiles; };
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# This function builds the various standard environments used during
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# the bootstrap. In all stages, we build an stdenv and the package
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# set that can be built with that stdenv.
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stageFun = prevStage:
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{ name, overrides ? (self: super: {}), extraBuildInputs ? [] }:
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let
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thisStdenv = import ../generic {
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inherit system config extraBuildInputs;
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name = "stdenv-linux-boot";
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preHook =
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''
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# Don't patch #!/interpreter because it leads to retained
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# dependencies on the bootstrapTools in the final stdenv.
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dontPatchShebangs=1
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${commonPreHook}
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'';
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shell = "${bootstrapTools}/bin/bash";
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initialPath = [bootstrapTools];
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fetchurlBoot = import ../../build-support/fetchurl/boot.nix {
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inherit system;
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};
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cc = if isNull prevStage.gcc-unwrapped
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then null
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else lib.makeOverridable (import ../../build-support/cc-wrapper) {
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nativeTools = false;
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nativeLibc = false;
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cc = prevStage.gcc-unwrapped;
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isGNU = true;
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libc = prevStage.glibc;
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inherit (prevStage) binutils coreutils gnugrep;
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name = name;
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stdenv = prevStage.ccWrapperStdenv;
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};
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extraAttrs = {
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# Having the proper 'platform' in all the stdenvs allows getting proper
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# linuxHeaders for example.
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inherit platform;
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# stdenv.glibc is used by GCC build to figure out the system-level
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# /usr/include directory.
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inherit (prevStage) glibc;
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};
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overrides = self: super: (overrides self super) // { fetchurl = thisStdenv.fetchurlBoot; };
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};
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in {
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inherit system platform crossSystem config overlays;
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stdenv = thisStdenv;
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};
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in
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[
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({}: {
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__raw = true;
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gcc-unwrapped = null;
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glibc = null;
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binutils = null;
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coreutils = null;
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gnugrep = null;
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})
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# Build a dummy stdenv with no GCC or working fetchurl. This is
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# because we need a stdenv to build the GCC wrapper and fetchurl.
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(prevStage: stageFun prevStage {
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name = null;
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overrides = self: super: {
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# We thread stage0's stdenv through under this name so downstream stages
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# can use it for wrapping gcc too. This way, downstream stages don't need
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# to refer to this stage directly, which violates the principle that each
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# stage should only access the stage that came before it.
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ccWrapperStdenv = self.stdenv;
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# The Glibc include directory cannot have the same prefix as the
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# GCC include directory, since GCC gets confused otherwise (it
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# will search the Glibc headers before the GCC headers). So
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# create a dummy Glibc here, which will be used in the stdenv of
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# stage1.
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glibc = self.stdenv.mkDerivation {
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name = "bootstrap-glibc";
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buildCommand = ''
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mkdir -p $out
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ln -s ${bootstrapTools}/lib $out/lib
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ln -s ${bootstrapTools}/include-glibc $out/include
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'';
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};
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gcc-unwrapped = bootstrapTools;
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binutils = bootstrapTools;
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coreutils = bootstrapTools;
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gnugrep = bootstrapTools;
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};
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})
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# Create the first "real" standard environment. This one consists
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# of bootstrap tools only, and a minimal Glibc to keep the GCC
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# configure script happy.
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#
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# For clarity, we only use the previous stage when specifying these
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# stages. So stageN should only ever have references for stage{N-1}.
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#
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# If we ever need to use a package from more than one stage back, we
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# simply re-export those packages in the middle stage(s) using the
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# overrides attribute and the inherit syntax.
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(prevStage: stageFun prevStage {
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name = "bootstrap-gcc-wrapper";
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# Rebuild binutils to use from stage2 onwards.
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overrides = self: super: {
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binutils = super.binutils.override { gold = false; };
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inherit (prevStage)
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ccWrapperStdenv
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glibc gcc-unwrapped coreutils gnugrep;
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# A threaded perl build needs glibc/libpthread_nonshared.a,
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# which is not included in bootstrapTools, so disable threading.
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# This is not an issue for the final stdenv, because this perl
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# won't be included in the final stdenv and won't be exported to
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# top-level pkgs as an override either.
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perl = super.perl.override { enableThreading = false; };
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};
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})
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# 2nd stdenv that contains our own rebuilt binutils and is used for
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# compiling our own Glibc.
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(prevStage: stageFun prevStage {
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name = "bootstrap-gcc-wrapper";
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overrides = self: super: {
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inherit (prevStage)
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ccWrapperStdenv
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binutils gcc-unwrapped coreutils gnugrep
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perl paxctl gnum4 bison;
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# This also contains the full, dynamically linked, final Glibc.
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};
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})
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# Construct a third stdenv identical to the 2nd, except that this
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# one uses the rebuilt Glibc from stage2. It still uses the recent
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# binutils and rest of the bootstrap tools, including GCC.
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(prevStage: stageFun prevStage {
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name = "bootstrap-gcc-wrapper";
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overrides = self: super: rec {
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inherit (prevStage)
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ccWrapperStdenv
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binutils glibc coreutils gnugrep
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perl patchelf linuxHeaders gnum4 bison;
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# Link GCC statically against GMP etc. This makes sense because
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# these builds of the libraries are only used by GCC, so it
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# reduces the size of the stdenv closure.
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gmp = super.gmp.override { stdenv = self.makeStaticLibraries self.stdenv; };
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mpfr = super.mpfr.override { stdenv = self.makeStaticLibraries self.stdenv; };
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libmpc = super.libmpc.override { stdenv = self.makeStaticLibraries self.stdenv; };
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isl_0_14 = super.isl_0_14.override { stdenv = self.makeStaticLibraries self.stdenv; };
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gcc-unwrapped = super.gcc-unwrapped.override {
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isl = isl_0_14;
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};
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};
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extraBuildInputs = [ prevStage.patchelf prevStage.paxctl ];
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})
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# Construct a fourth stdenv that uses the new GCC. But coreutils is
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# still from the bootstrap tools.
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(prevStage: stageFun prevStage {
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name = "";
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overrides = self: super: {
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# Zlib has to be inherited and not rebuilt in this stage,
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# because gcc (since JAR support) already depends on zlib, and
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# then if we already have a zlib we want to use that for the
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# other purposes (binutils and top-level pkgs) too.
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inherit (prevStage) gettext gnum4 bison gmp perl glibc zlib linuxHeaders;
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gcc = lib.makeOverridable (import ../../build-support/cc-wrapper) {
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nativeTools = false;
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nativeLibc = false;
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isGNU = true;
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cc = prevStage.gcc-unwrapped;
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libc = self.glibc;
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inherit (self) stdenv binutils coreutils gnugrep;
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name = "";
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shell = self.bash + "/bin/bash";
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};
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};
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extraBuildInputs = [ prevStage.patchelf prevStage.xz ];
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})
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# Construct the final stdenv. It uses the Glibc and GCC, and adds
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# in a new binutils that doesn't depend on bootstrap-tools, as well
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# as dynamically linked versions of all other tools.
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#
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# When updating stdenvLinux, make sure that the result has no
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# dependency (`nix-store -qR') on bootstrapTools or the first
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# binutils built.
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(prevStage: {
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inherit system crossSystem platform config;
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stdenv = import ../generic rec {
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inherit system config;
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preHook = ''
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# Make "strip" produce deterministic output, by setting
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# timestamps etc. to a fixed value.
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commonStripFlags="--enable-deterministic-archives"
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${commonPreHook}
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'';
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initialPath =
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((import ../common-path.nix) {pkgs = prevStage;});
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extraBuildInputs = [ prevStage.patchelf prevStage.paxctl ];
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cc = prevStage.gcc;
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shell = cc.shell;
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inherit (prevStage.stdenv) fetchurlBoot;
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extraAttrs = {
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inherit (prevStage) glibc;
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inherit platform bootstrapTools;
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shellPackage = prevStage.bash;
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};
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/* outputs TODO
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allowedRequisites = with prevStage;
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[ gzip bzip2 xz bash binutils coreutils diffutils findutils gawk
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glibc gnumake gnused gnutar gnugrep gnupatch patchelf attr acl
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paxctl zlib pcre linuxHeaders ed gcc gcc.cc libsigsegv
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];
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*/
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overrides = self: super: {
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gcc = cc;
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inherit (prevStage)
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gzip bzip2 xz bash binutils coreutils diffutils findutils gawk
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glibc gnumake gnused gnutar gnugrep gnupatch patchelf
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attr acl paxctl zlib pcre;
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};
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};
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})
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]
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