core/pkgs/stdenv/darwin/override-sdk.nix
2024-05-13 11:34:52 -04:00

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# The basic algorithm is to rewrite the propagated inputs of a package and any of its
# own propagated inputs recursively to replace references from the default SDK with
# those from the requested SDK version. This is done across all propagated inputs to
# avoid making assumptions about how those inputs are being used.
#
# For example, packages may propagate target-target dependencies with the expectation that
# they will be just build inputs when the package itself is used as a native build input.
#
# To support this use case and operate without regard to the original package set,
# `overrideSDK` creates a mapping from the default SDK in all package categories to the
# requested SDK. If the lookup fails, it is assumed the package is not part of the SDK.
# Non-SDK packages are processed per the algorithm described above.
{
lib,
stdenvNoCC,
extendMkDerivationArgs,
pkgsBuildBuild,
pkgsBuildHost,
pkgsBuildTarget,
pkgsHostHost,
pkgsHostTarget,
pkgsTargetTarget,
}@args:
let
# Takes a mapping from a package to its replacement and transforms it into a list of
# mappings by output (e.g., a package with three outputs produces a list of size 3).
expandOutputs =
mapping:
map (output: {
name = builtins.unsafeDiscardStringContext (lib.getOutput output mapping.original);
value = lib.getOutput output mapping.replacement;
}) mapping.original.outputs;
# Produces a list of mappings from the default SDK to the new SDK (`sdk`).
# `attr` indicates which SDK path to remap (e.g., `libs` remaps `apple_sdk.libs`).
#
# TODO: Update once the SDKs have been refactored to a common pattern to better handle
# frameworks that are not present in both SDKs. Currently, theyre dropped.
mkMapping =
attr: pkgs: sdk:
lib.foldlAttrs (
mappings: name: pkg:
let
# Avoid evaluation failures due to missing or throwing
# frameworks (such as QuickTime in the 11.0 SDK).
maybeReplacement = builtins.tryEval sdk.${attr}.${name} or { success = false; };
in
if maybeReplacement.success then
mappings
++ expandOutputs {
original = pkg;
replacement = maybeReplacement.value;
}
else
mappings
) [ ] pkgs.darwin.apple_sdk.${attr};
# Produces a list of overrides for the given package set, SDK, and version.
# If you want to manually specify a mapping, this is where you should do it.
mkOverrides =
pkgs: sdk: version:
lib.concatMap expandOutputs [
# Libsystem needs to match the one used by the SDK or weird errors happen.
{
original = pkgs.darwin.apple_sdk.Libsystem;
replacement = sdk.Libsystem;
}
# Make sure darwin.CF is mapped to the correct version for the SDK.
{
original = pkgs.darwin.CF;
replacement = sdk.frameworks.CoreFoundation;
}
# libobjc needs to be handled specially because its not actually in the SDK.
{
original = pkgs.darwin.libobjc;
replacement = sdk.objc4;
}
# Unfortunately, this is not consistent between Darwin SDKs in nixpkgs, so
# try both versions to map between them.
{
original = pkgs.darwin.apple_sdk.sdk or pkgs.darwin.apple_sdk.MacOSX-SDK;
replacement = sdk.sdk or sdk.MacOSX-SDK;
}
# Remap the SDK root. This is used by clang to set the SDK version when
# linking. This behavior is automatic by clang and cant be overriden.
# Otherwise, without the SDK root set, the SDK version will be inferred to
# be the same as the deployment target, which is not usually what you want.
{
original = pkgs.darwin.apple_sdk.sdkRoot;
replacement = sdk.sdkRoot;
}
# Override xcodebuild because it hardcodes the SDK version.
# TODO: Make xcodebuild defer to the SDK root set in the stdenv.
{
original = pkgs.xcodebuild;
replacement = pkgs.xcodebuild.override {
# Do the override manually to avoid an infinite recursion.
stdenv = pkgs.stdenv.override (old: {
buildPlatform = mkPlatform version old.buildPlatform;
hostPlatform = mkPlatform version old.hostPlatform;
targetPlatform = mkPlatform version old.targetPlatform;
allowedRequisites = null;
cc = mkCC sdk.Libsystem old.cc;
});
};
}
];
mkBintools =
Libsystem: bintools:
if bintools ? override then
bintools.override { libc = Libsystem; }
else
let
# `override` isnt available, so bintools has to be rewrapped with the new libc.
# Most of the required arguments can be recovered except for `postLinkSignHook`
# and `signingUtils`, which have to be scrapped from the originals `postFixup`.
# This isnt ideal, but it works.
postFixup = lib.splitString "\n" bintools.postFixup;
postLinkSignHook = lib.pipe postFixup [
(lib.findFirst (lib.hasPrefix "echo 'source") null)
(builtins.match "^echo 'source (.*-post-link-sign-hook)' >> \\$out/nix-support/post-link-hook$")
lib.head
];
signingUtils = lib.pipe postFixup [
(lib.findFirst (lib.hasPrefix "export signingUtils") null)
(builtins.match "^export signingUtils=(.*)$")
lib.head
];
newBintools = pkgsBuildTarget.wrapBintoolsWith {
inherit (bintools) name;
buildPackages = { };
libc = Libsystem;
inherit lib;
coreutils = bintools.coreutils_bin;
gnugrep = bintools.gnugrep_bin;
inherit (bintools) bintools;
inherit postLinkSignHook signingUtils;
};
in
lib.getOutput bintools.outputName newBintools;
mkCC =
Libsystem: cc:
if cc ? override then
cc.override {
bintools = mkBintools Libsystem cc.bintools;
libc = Libsystem;
}
else
builtins.throw "CC has no override: ${cc}";
mkPlatform =
version: platform:
platform
// lib.optionalAttrs platform.isDarwin { inherit (version) darwinMinVersion darwinSdkVersion; };
# Creates a stub package. Unchanged files from the original package are symlinked
# into the package. The contents of `nix-support` are updated to reference any
# replaced packages.
#
# Note: `env` is an attrset containing `outputs` and `dependencies`.
# `dependencies` is a regex passed to sed and must be `passAsFile`.
mkProxyPackage =
name: env:
stdenvNoCC.mkDerivation {
inherit name;
inherit (env) outputs replacements sourceOutputs;
# Take advantage of the fact that replacements and sourceOutputs will be passed
# via JSON and parsed into environment variables.
__structuredAttrs = true;
buildCommand = ''
# Map over the outputs in the package being replaced to make sure the proxy is
# a fully functional replacement. This is like `symlinkJoin` except for
# outputs and the contents of `nix-support`, which will be customized.
function replacePropagatedInputs() {
local sourcePath=$1
local targetPath=$2
mkdir -p "$targetPath"
local sourceFile
for sourceFile in "$sourcePath"/*; do
local fileName=$(basename "$sourceFile")
local targetFile="$targetPath/$fileName"
if [ -d "$sourceFile" ]; then
replacePropagatedInputs "$sourceFile" "$targetPath/$fileName"
# Check to see if any of the files in the folder were replaced.
# Otherwise, replace the folder with a symlink if none were changed.
if [ "$(find -maxdepth 1 "$targetPath/$fileName" -not -type l)" = "" ]; then
rm "$targetPath/$fileName"/*
ln -s "$sourceFile" "$targetPath/$fileName"
fi
else
cp "$sourceFile" "$targetFile"
local original
for original in "''${!replacements[@]}"; do
substituteInPlace "$targetFile" \
--replace-quiet "$original" "''${replacements[$original]}"
done
if cmp -s "$sourceFile" "$targetFile"; then
rm "$targetFile"
ln -s "$sourceFile" "$targetFile"
fi
fi
done
}
local outputName
for outputName in "''${!outputs[@]}"; do
local outPath=''${outputs[$outputName]}
mkdir -p "$outPath"
local sourcePath
for sourcePath in "''${sourceOutputs[$outputName]}"/*; do
sourceName=$(basename "$sourcePath")
# `nix-support` is special-cased because any propagated inputs need their
# SDK frameworks replaced with those from the requested SDK.
if [ "$sourceName" == "nix-support" ]; then
replacePropagatedInputs "$sourcePath" "$outPath/nix-support"
else
ln -s "$sourcePath" "$outPath/$sourceName"
fi
done
done
'';
};
# Gets all propagated inputs in a package. This does not recurse.
getPropagatedInputs =
pkg:
lib.optionals (lib.isDerivation pkg) (
lib.concatMap (input: pkg.${input} or [ ]) [
"depsBuildBuildPropagated"
"propagatedNativeBuildInputs"
"depsBuildTargetPropagated"
"depsHostHostPropagated"
"propagatedBuildInputs"
"depsTargetTargetPropagated"
]
);
# Looks up the replacement for `pkg` in the `newPackages` mapping. If `pkg` is a
# compiler (meaning it has a `libc` attribute), the compiler will be overriden.
getReplacement =
newPackages: pkg:
let
pkgOrCC =
if pkg.libc or null != null then
# Heuristic to determine whether package is a compiler or bintools.
if pkg.wrapperName == "CC_WRAPPER" then
mkCC (getReplacement newPackages pkg.libc) pkg
else
mkBintools (getReplacement newPackages pkg.libc) pkg
else
pkg;
in
if lib.isDerivation pkg then
newPackages.${builtins.unsafeDiscardStringContext pkg} or pkgOrCC
else
pkg;
# Replaces all packages propagated by `pkgs` using the `newPackages` mapping.
# It is assumed that all possible overrides have already been incorporated into
# the mapping. If any propagated packages are replaced, a proxy package will be
# created with references to the old packages replaced in `nix-support`.
replacePropagatedPackages =
newPackages: pkg:
let
propagatedInputs = getPropagatedInputs pkg;
env = {
inherit (pkg) outputs;
replacements = lib.pipe propagatedInputs [
(lib.filter (pkg: pkg != null))
(map (dep: {
name = builtins.unsafeDiscardStringContext dep;
value = getReplacement newPackages dep;
}))
(lib.filter (mapping: mapping.name != mapping.value))
lib.listToAttrs
];
sourceOutputs = lib.genAttrs pkg.outputs (output: lib.getOutput output pkg);
};
in
# Only remap the packages propagated inputs if there are any and if any of them
# had packages remapped (with frameworks or proxy packages).
if propagatedInputs != [ ] && env.replacements != { } then mkProxyPackage pkg.name env else pkg;
# Gets all propagated dependencies in a package in reverse order sorted topologically.
# This takes advantage of the fact that items produced by `operator` are pushed to
# the end of the working set, ensuring that dependencies always appear after their
# parent in the list with leaf nodes at the end.
topologicallyOrderedPropagatedDependencies =
pkgs:
let
mapPackageDeps = lib.flip lib.pipe [
(lib.filter (pkg: pkg != null))
(map (pkg: {
key = builtins.unsafeDiscardStringContext pkg;
package = pkg;
deps = getPropagatedInputs pkg;
}))
];
in
lib.genericClosure {
startSet = mapPackageDeps pkgs;
operator = { deps, ... }: mapPackageDeps deps;
};
# Returns a package mapping based on remapping all propagated packages.
getPackageMapping =
baseMapping: input:
let
dependencies = topologicallyOrderedPropagatedDependencies input;
in
lib.foldr (
pkg: newPackages:
let
replacement = replacePropagatedPackages newPackages pkg.package;
outPath = pkg.key;
in
if pkg.key == null || newPackages ? ${outPath} then
newPackages
else
newPackages // { ${outPath} = replacement; }
) baseMapping dependencies;
overrideSDK =
stdenv: sdkVersion:
let
newVersion = {
inherit (stdenv.hostPlatform) darwinMinVersion darwinSdkVersion;
} // (if lib.isAttrs sdkVersion then sdkVersion else { darwinSdkVersion = sdkVersion; });
inherit (newVersion) darwinMinVersion darwinSdkVersion;
# Used to get an SDK version corresponding to the requested `darwinSdkVersion`.
# TODO: Treat `darwinSdkVersion` as a constraint rather than as an exact version.
resolveSDK = pkgs: pkgs.darwin."apple_sdk_${lib.replaceStrings [ "." ] [ "_" ] darwinSdkVersion}";
# `newSdkPackages` is constructed based on the assumption that SDK packages only
# propagate versioned packages from that SDK -- that they neither propagate
# unversioned SDK packages nor propagate non-SDK packages (such as curl).
#
# Note: `builtins.unsafeDiscardStringContext` is used to allow the path from the
# original package output to be mapped to the replacement. This is safe because
# the value is not persisted anywhere and necessary because store paths are not
# allowed as attrset names otherwise.
baseSdkMapping = lib.pipe args [
(lib.flip removeAttrs [
"lib"
"stdenvNoCC"
"extendMkDerivationArgs"
])
(lib.filterAttrs (_: lib.hasAttr "darwin"))
lib.attrValues
(lib.concatMap (
pkgs:
let
newSDK = resolveSDK pkgs;
frameworks = mkMapping "frameworks" pkgs newSDK;
libs = mkMapping "libs" pkgs newSDK;
overrides = mkOverrides pkgs newSDK newVersion;
in
frameworks ++ libs ++ overrides
))
lib.listToAttrs
];
# Remaps all inputs given to the requested SDK version. The result is an attrset
# that can be passed to `extendMkDerivationArgs`.
mapInputsToSDK =
inputs: args:
lib.pipe inputs [
(lib.filter (input: args ? ${input}))
(lib.flip lib.genAttrs (
inputName:
let
input = args.${inputName};
newPackages = getPackageMapping baseSdkMapping input;
in
map (getReplacement newPackages) input
))
];
in
stdenv.override (
old:
{
buildPlatform = mkPlatform newVersion old.buildPlatform;
hostPlatform = mkPlatform newVersion old.hostPlatform;
targetPlatform = mkPlatform newVersion old.targetPlatform;
}
# Only perform replacements if the SDK version has changed. Changing only the
# deployment target does not require replacing the libc or SDK dependencies.
// lib.optionalAttrs (old.hostPlatform.darwinSdkVersion != darwinSdkVersion) {
allowedRequisites = null;
mkDerivationFromStdenv = extendMkDerivationArgs old (mapInputsToSDK [
"depsBuildBuild"
"nativeBuildInputs"
"depsBuildTarget"
"depsHostHost"
"buildInputs"
"depsTargetTarget"
"depsBuildBuildPropagated"
"propagatedNativeBuildInputs"
"depsBuildTargetPropagated"
"depsHostHostPropagated"
"propagatedBuildInputs"
"depsTargetTargetPropagated"
]);
cc = getReplacement baseSdkMapping old.cc;
extraBuildInputs = map (getReplacement baseSdkMapping) stdenv.extraBuildInputs;
extraNativeBuildInputs = map (getReplacement baseSdkMapping) stdenv.extraNativeBuildInputs;
}
);
in
overrideSDK