nixpkgs/pkgs/stdenv/generic/make-derivation.nix

# PERF: This file is evaluated for every derivation in the build closure.
# Avoid `// optionalAttrs` — each call allocates a closure, an intermediate
# attrset, and a `//` merge.  Use nullable attribute names instead:
#
#   ${if cond then "name" else null} = value;
#
# See https://github.com/NixOS/nixpkgs/pull/430969 for measurements.

lib:
let
  # Lib attributes are inherited to the lexical scope for performance reasons.
  inherit (lib)
    all
    attrNames
    concatLists
    concatMap
    concatMapStrings
    concatMapStringsSep
    concatStringsSep
    elem
    extendDerivation
    filter
    filterAttrs
    foldl'
    getDev
    head
    intersectAttrs
    isAttrs
    isBool
    isDerivation
    isInt
    isFunction
    isList
    isPath
    isString
    listToAttrs
    mapAttrs
    mapNullable
    optional
    optionalString
    optionals
    remove
    seq
    splitString
    subtractLists
    toFunction
    typeOf
    unique
    unsafeDiscardStringContext
    unsafeGetAttrPos
    warn
    zipAttrsWith
    any
    ;

  inherit (lib.generators) toPretty;
  inherit (lib.strings) sanitizeDerivationName;

  knownHardeningFlags = [
    "bindnow"
    "format"
    "fortify"
    "fortify3"
    "strictflexarrays1"
    "strictflexarrays3"
    "shadowstack"
    "nostrictaliasing"
    "pacret"
    "pic"
    "relro"
    "stackprotector"
    "glibcxxassertions"
    "libcxxhardeningfast"
    "libcxxhardeningextensive"
    "stackclashprotection"
    "strictoverflow"
    "trivialautovarinit"
    "zerocallusedregs"
  ];

  removedOrReplacedAttrNames = [
    "checkInputs"
    "installCheckInputs"
    "nativeCheckInputs"
    "nativeInstallCheckInputs"
    "__contentAddressed"
    "__darwinAllowLocalNetworking"
    "__impureHostDeps"
    "__propagatedImpureHostDeps"
    "sandboxProfile"
    "propagatedSandboxProfile"
    "disallowedReferences"
    "disallowedRequisites"
    "allowedReferences"
    "allowedRequisites"
    "allowedImpureDLLs"
  ];

  referenceCheckingAttrsToRemove = [
    "allowedReferences"
    "allowedRequisites"
    "disallowedReferences"
    "disallowedRequisites"
  ];

  argumentAttrsToRemove = [
    "meta"
    "passthru"
    "pos"
    "env"
  ];

  attrsToRemoveLast = [
    # Fixed-output derivations may not reference other paths, which means that for a fixed-output
    # derivation, the corresponding inputDerivation should *not* be fixed-output. To achieve this we
    # simply delete the attributes that would make it fixed-output.
    "outputHashAlgo"
    "outputHash"
    "outputHashMode"

    # inputDerivation produces the inputs; not the outputs, so any restrictions on what used to be
    # the outputs don't serve a purpose anymore.
    "allowedReferences"
    "allowedRequisites"
    "disallowedReferences"
    "disallowedRequisites"
    "outputChecks"
  ];

  defaultBuilderArgs = [
    "-e"
    ./source-stdenv.sh
    ./default-builder.sh
  ];

  isSingularDependency = dep: dep == null || isDerivation dep || isString dep || isPath dep;

  cachedOutputChecks = {
    out = { };
  };
  debugCachedOutputChecks = {
    out = { };
    debug = { };
  };

  # Turn a derivation into its outPath without a string context attached.
  # See the comment at the usage site.
  unsafeDerivationToUntrackedOutpath =
    drv:
    if isDerivation drv && (!drv.__contentAddressed or false) then
      unsafeDiscardStringContext drv.outPath
    else
      drv;

  makeOutputChecks =
    attrs:
    # If we use derivations directly here, they end up as build-time dependencies.
    # This is especially problematic in the case of disallowed*, since the disallowed
    # derivations will be built by nix as build-time dependencies, while those
    # derivations might take a very long time to build, or might not even build
    # successfully on the platform used.
    # We can improve on this situation by instead passing only the outPath,
    # without an attached string context, to nix. The out path will be a placeholder
    # which will be replaced by the actual out path if the derivation in question
    # is part of the final closure (and thus needs to be built). If it is not
    # part of the final closure, then the placeholder will be passed along,
    # but in that case we know for a fact that the derivation is not part of the closure.
    # This means that passing the out path to nix does the right thing in either
    # case, both for disallowed and allowed references/requisites, and we won't
    # build the derivation if it wouldn't be part of the closure, saving time and resources.
    # While the problem is less severe for allowed*, since we want the derivation
    # to be built eventually, we would still like to get the error early and without
    # having to wait while nix builds a derivation that might not be used.
    # See also https://github.com/NixOS/nix/issues/4629
    {
      ${if (attrs ? disallowedReferences) then "disallowedReferences" else null} =
        map unsafeDerivationToUntrackedOutpath attrs.disallowedReferences;
      ${if (attrs ? disallowedRequisites) then "disallowedRequisites" else null} =
        map unsafeDerivationToUntrackedOutpath attrs.disallowedRequisites;
      ${if (attrs ? allowedReferences) then "allowedReferences" else null} =
        mapNullable unsafeDerivationToUntrackedOutpath attrs.allowedReferences;
      ${if (attrs ? allowedRequisites) then "allowedRequisites" else null} =
        mapNullable unsafeDerivationToUntrackedOutpath attrs.allowedRequisites;
    };
in
config:
let
  doCheckByDefault = config.doCheckByDefault or false;
  structuredAttrsByDefault = config.structuredAttrsByDefault or false;
  inherit (config) enableParallelBuildingByDefault contentAddressedByDefault;
  userHook = config.stdenv.userHook or null;
  checkMeta = import ./check-meta.nix {
    inherit lib config;
  };
in
stdenv:

let
  inherit (import ../../build-support/lib/cmake.nix { inherit lib stdenv; }) makeCMakeFlags;
  inherit (import ../../build-support/lib/meson.nix { inherit lib stdenv; }) makeMesonFlags;

  # Nix itself uses the `system` field of a derivation to decide where
  # to build it. This is a bit confusing for cross compilation.
  commonMeta = checkMeta.commonMeta hostPlatform;
  assertValidity = checkMeta.assertValidity hostPlatform;

  /**
    This function creates a derivation, and returns it in the form of a [package attribute set](https://nix.dev/manual/nix/latest/glossary#package-attribute-set)
    that refers to the derivation's outputs.

    `mkDerivation` takes many argument attributes, most of which affect the derivation environment,
    but [`meta`](#chap-meta) and [`passthru`](#var-stdenv-passthru) only directly affect package attributes.

    The `mkDerivation` argument attributes can be made to refer to one another by passing a function to `mkDerivation`.
    See [Fixed-point argument of `mkDerivation`](#mkderivation-recursive-attributes).

    Reference documentation see: https://nixos.org/manual/nixpkgs/stable/#sec-using-stdenv

    :::{.note}
    This is used as the fundamental building block of most other functions in Nixpkgs for creating derivations.

    Most arguments are also passed through to the underlying call of [`derivation`](https://nixos.org/manual/nix/stable/language/derivations).
    :::
  */
  mkDerivation = fnOrAttrs: makeDerivationExtensible (toFunction fnOrAttrs);

  # Based off lib.makeExtensible, with modifications:
  makeDerivationExtensible =
    rattrs:
    let
      # NOTE: The following is a hint that will be printed by the Nix cli when
      # encountering an infinite recursion. It must not be formatted into
      # separate lines, because Nix would only show the last line of the comment.

      # An infinite recursion here can be caused by having the attribute names of expression `e` in `.overrideAttrs(finalAttrs: previousAttrs: e)` depend on `finalAttrs`. Only the attribute values of `e` can depend on `finalAttrs`.
      args = rattrs (args // { inherit finalPackage overrideAttrs; });
      #              ^^^^

      /**
        Override the attributes that were passed to `mkDerivation` in order to generate this derivation.
      */
      # NOTE: the above documentation had to be duplicated in `lib/customisation.nix`: `makeOverridable`.
      overrideAttrs =
        f0:
        makeDerivationExtensible (
          final:
          let
            prev = rattrs final;
            # inlined version of toExtension
            thisOverlay =
              if isFunction f0 then
                let
                  fPrev = f0 prev;
                in
                if isFunction fPrev then
                  # f is (final: prev: { ... })
                  f0 final prev
                else
                  # f is (prev: { ... })
                  fPrev
              else
                # f is not a function; probably { ... }
                f0;
          in
          (
            if
              prev ? src
              && thisOverlay ? version
              && prev ? version
              # We could check that the version is actually distinct, but that
              # would probably just delay the inevitable, or preserve tech debt.
              # && prev.version != thisOverlay.version
              && !(thisOverlay ? src)
              && !(thisOverlay.__intentionallyOverridingVersion or false)

            then
              warn (
                let
                  pos = unsafeGetAttrPos "version" thisOverlay;
                in
                ''
                  ${
                    args.name or "${args.pname or "<unknown name>"}-${args.version or "<unknown version>"}"
                  } was overridden with `version` but not `src` at ${pos.file or "<unknown file>"}:${
                    toString pos.line or "<unknown line>"
                  }:${toString pos.column or "<unknown column>"}.

                  This is most likely not what you want. In order to properly change the version of a package, override
                  both the `version` and `src` attributes:

                  hello.overrideAttrs (oldAttrs: rec {
                    version = "1.0.0";
                    src = pkgs.fetchurl {
                      url = "mirror://gnu/hello/hello-''${version}.tar.gz";
                      hash = "...";
                    };
                  })

                  (To silence this warning, set `__intentionallyOverridingVersion = true` in your `overrideAttrs` call.)
                ''
              )
            else
              x: x
          )
            (prev // (removeAttrs thisOverlay [ "__intentionallyOverridingVersion" ]))
        );

      finalPackage = mkDerivationSimple overrideAttrs args;

    in
    finalPackage;

  inherit (stdenv)
    hostPlatform
    buildPlatform
    targetPlatform
    extraNativeBuildInputs
    extraBuildInputs
    extraSandboxProfile
    __extraImpureHostDeps
    ;

  stdenvHasCC = stdenv.hasCC;
  stdenvShell = stdenv.shell;

  buildPlatformSystem = buildPlatform.system;
  buildIsDarwin = buildPlatform.isDarwin;

  inherit (hostPlatform)
    isLinux
    isWindows
    isCygwin
    isStatic
    isMusl
    ;

  # Target is not included by default because most programs don't care.
  # Including it then would cause needless mass rebuilds.
  #
  # TODO(@Ericson2314): Make [ "build" "host" ] always the default / resolve #87909
  useDefaultConfigurePlatforms = hostPlatform != buildPlatform || config.configurePlatformsByDefault;
  defaultConfigurePlatforms = optionals useDefaultConfigurePlatforms [
    "build"
    "host"
  ];
  buildPlatformConfigureFlag = "--build=${buildPlatform.config}";
  hostPlatformConfigureFlag = "--host=${hostPlatform.config}";
  targetPlatformConfigureFlag = "--target=${targetPlatform.config}";
  defaultConfigurePlatformsFlags = optionals useDefaultConfigurePlatforms [
    buildPlatformConfigureFlag
    hostPlatformConfigureFlag
  ];

  # TODO(@Ericson2314): Make always true and remove / resolve #178468
  defaultStrictDeps = if config.strictDepsByDefault then true else hostPlatform != buildPlatform;

  canExecuteHostOnBuild = buildPlatform.canExecute hostPlatform;
  defaultHardeningFlags = stdenv.cc.defaultHardeningFlags or knownHardeningFlags;
  hostSuffixNecessary = hostPlatform != buildPlatform && stdenvHasCC;
  stdenvHostSuffix = "-${hostPlatform.config}";
  stdenvStaticMarker = optionalString isStatic "-static";

  requiredSystemFeaturesShouldBeSet =
    buildPlatform ? gcc.arch
    && !(
      buildPlatform.isAarch64
      && (
        # `aarch64-darwin` sets `{gcc.arch = "armv8.3-a+crypto+sha2+...";}`
        buildPlatform.isDarwin
        ||
          # `aarch64-linux` has `{ gcc.arch = "armv8-a"; }` set by default
          buildPlatform.gcc.arch == "armv8-a"
      )
    );
  gccArchFeature = [ "gccarch-${buildPlatform.gcc.arch}" ];

  makeDerivationArgument =

    # `makeDerivationArgument` is responsible for the `mkDerivation` arguments that
    # affect the actual derivation, excluding a few behaviors that are not
    # essential, and specific to `mkDerivation`: `env`, `cmakeFlags`, `mesonFlags`.
    #
    # See also:
    #
    # * https://nixos.org/nixpkgs/manual/#sec-using-stdenv
    #   Details on how to use this mkDerivation function
    #
    # * https://nixos.org/manual/nix/stable/expressions/derivations.html#derivations
    #   Explanation about derivations in general
    {

      # These types of dependencies are all exhaustively documented in
      # the "Specifying Dependencies" section of the "Standard
      # Environment" chapter of the Nixpkgs manual.

      # TODO(@Ericson2314): Stop using legacy dep attribute names

      #                                 host offset -> target offset
      depsBuildBuild ? [ ], # -1 -> -1
      depsBuildBuildPropagated ? [ ], # -1 -> -1
      nativeBuildInputs ? [ ], # -1 ->  0  N.B. Legacy name
      propagatedNativeBuildInputs ? [ ], # -1 ->  0  N.B. Legacy name
      depsBuildTarget ? [ ], # -1 ->  1
      depsBuildTargetPropagated ? [ ], # -1 ->  1

      depsHostHost ? [ ], # 0 ->  0
      depsHostHostPropagated ? [ ], # 0 ->  0
      buildInputs ? [ ], # 0 ->  1  N.B. Legacy name
      propagatedBuildInputs ? [ ], # 0 ->  1  N.B. Legacy name

      depsTargetTarget ? [ ], # 1 ->  1
      depsTargetTargetPropagated ? [ ], # 1 ->  1

      checkInputs ? [ ],
      installCheckInputs ? [ ],
      nativeCheckInputs ? [ ],
      nativeInstallCheckInputs ? [ ],

      # Configure Phase
      configureFlags ? [ ],
      configurePlatforms ? defaultConfigurePlatforms,

      # TODO(@Ericson2314): Make unconditional / resolve #33599
      # Check phase
      doCheck ? doCheckByDefault,

      # TODO(@Ericson2314): Make unconditional / resolve #33599
      # InstallCheck phase
      doInstallCheck ? doCheckByDefault,

      # TODO(@Ericson2314): Make always true and remove / resolve #178468
      strictDeps ? defaultStrictDeps,

      enableParallelBuilding ? enableParallelBuildingByDefault,

      separateDebugInfo ? false,
      outputs ? [ "out" ],
      __darwinAllowLocalNetworking ? false,
      __impureHostDeps ? [ ],
      __propagatedImpureHostDeps ? [ ],
      sandboxProfile ? "",
      propagatedSandboxProfile ? "",

      allowedImpureDLLs ? [ ],

      hardeningEnable ? [ ],
      hardeningDisable ? [ ],

      patches ? [ ],

      __contentAddressed ?
        (!attrs ? outputHash) # Fixed-output drvs can't be content addressed too
        && contentAddressedByDefault,

      # Experimental.  For simple packages mostly just works,
      # but for anything complex, be prepared to debug if enabling.
      __structuredAttrs ? structuredAttrsByDefault,

      ...
    }@attrs:
    let
      # TODO(@oxij, @Ericson2314): This is here to keep the old semantics, remove when
      # no package has `doCheck = true`.
      doCheck' = doCheck && canExecuteHostOnBuild;
      doInstallCheck' = doInstallCheck && canExecuteHostOnBuild;

      separateDebugInfo' =
        let
          actualValue = separateDebugInfo && isLinux;
        in
        if
          actualValue
          && (
            attrs ? "disallowedReferences"
            || attrs ? "disallowedRequisites"
            || attrs ? "allowedRequisites"
            || attrs ? "allowedReferences"
          )
          && !__structuredAttrs
        then
          throw "separateDebugInfo = true in ${
            attrs.pname or "mkDerivation argument"
          } requires __structuredAttrs if {dis,}allowedRequisites or {dis,}allowedReferences is set"
        else
          actualValue;
      outputs' = if separateDebugInfo' then outputs ++ [ "debug" ] else outputs;

      checkDependencyList = checkDependencyList' [ ];
      checkDependencyList' =
        positions: name: deps:
        if all isSingularDependency deps then
          deps
        else
          # iterate again with the index if an invalid type was passed, or we
          # need to recurse into a sublist. making sublists take longer is
          # worth it, since nobody uses them and handling them makes normal
          # dependencies slower
          seq (foldl' (
            index: dep:
            if isSingularDependency dep then
              index + 1
            else if isList dep then
              warn
                ''
                  Dependency of package '${attrs.name or attrs.pname}' uses a nested list in attribute '${name}'.
                  This is deprecated as of Nixpkgs release 26.05, and support will
                  be removed in a future nixpkgs release.''
                (seq (checkDependencyList' ([ index ] ++ positions) name dep) (index + 1))
            else
              throw "Dependency is not of a valid type: ${
                concatMapStrings (ix: "element ${toString ix} of ") ([ index ] ++ positions)
              }${name} for ${attrs.name or attrs.pname}"
          ) 1 deps) deps;

      isErroneous = flag: !elem flag knownHardeningFlags;
    in
    if
      # Check if any hardening flag is erroneous
      any isErroneous hardeningEnable || any (flag: flag != "all" && isErroneous flag) hardeningDisable
    then
      abort (
        let
          erroneousHardeningFlags = subtractLists knownHardeningFlags (
            hardeningEnable ++ remove "all" hardeningDisable
          );
        in
        "mkDerivation was called with unsupported hardening flags: "
        + toPretty { } {
          inherit
            erroneousHardeningFlags
            hardeningDisable
            hardeningEnable
            knownHardeningFlags
            ;
        }
      )
    else
      let
        doCheck = doCheck';
        doInstallCheck = doInstallCheck';
        buildInputs' =
          buildInputs ++ optionals doCheck checkInputs ++ optionals doInstallCheck installCheckInputs;
        nativeBuildInputs' =
          nativeBuildInputs
          ++ optional separateDebugInfo' ../../build-support/setup-hooks/separate-debug-info.sh
          ++ optional isWindows ../../build-support/setup-hooks/win-dll-link.sh
          ++ optionals doCheck nativeCheckInputs
          ++ optionals doInstallCheck nativeInstallCheckInputs;

        outputs = outputs';

        buildBuildOutputs =
          if depsBuildBuild == [ ] then
            [ ]
          else
            map (drv: getDev drv.__spliced.buildBuild or drv) (
              checkDependencyList "depsBuildBuild" depsBuildBuild
            );
        buildHostOutputs =
          if nativeBuildInputs' == [ ] then
            [ ]
          else
            map (drv: getDev drv.__spliced.buildHost or drv) (
              checkDependencyList "nativeBuildInputs" nativeBuildInputs'
            );
        buildTargetOutputs =
          if depsBuildTarget == [ ] then
            [ ]
          else
            map (drv: getDev drv.__spliced.buildTarget or drv) (
              checkDependencyList "depsBuildTarget" depsBuildTarget
            );
        hostHostOutputs =
          if depsHostHost == [ ] then
            [ ]
          else
            map (drv: getDev drv.__spliced.hostHost or drv) (checkDependencyList "depsHostHost" depsHostHost);
        hostTargetOutputs =
          if buildInputs' == [ ] then
            [ ]
          else
            map (drv: getDev drv.__spliced.hostTarget or drv) (checkDependencyList "buildInputs" buildInputs');
        targetTargetOutputs =
          if depsTargetTarget == [ ] then
            [ ]
          else
            map (drv: getDev drv.__spliced.targetTarget or drv) (
              checkDependencyList "depsTargetTarget" depsTargetTarget
            );
        allDependencies = concatLists [
          buildBuildOutputs
          buildHostOutputs
          buildTargetOutputs
          hostHostOutputs
          hostTargetOutputs
          targetTargetOutputs
        ];

        propagatedBuildBuildOutputs =
          if depsBuildBuildPropagated == [ ] then
            [ ]
          else
            map (drv: getDev drv.__spliced.buildBuild or drv) (
              checkDependencyList "depsBuildBuildPropagated" depsBuildBuildPropagated
            );
        propagatedBuildHostOutputs =
          if propagatedNativeBuildInputs == [ ] then
            [ ]
          else
            map (drv: getDev drv.__spliced.buildHost or drv) (
              checkDependencyList "propagatedNativeBuildInputs" propagatedNativeBuildInputs
            );
        propagatedBuildTargetOutputs =
          if depsBuildTargetPropagated == [ ] then
            [ ]
          else
            map (drv: getDev drv.__spliced.buildTarget or drv) (
              checkDependencyList "depsBuildTargetPropagated" depsBuildTargetPropagated
            );
        propagatedHostHostOutputs =
          if depsHostHostPropagated == [ ] then
            [ ]
          else
            map (drv: getDev drv.__spliced.hostHost or drv) (
              checkDependencyList "depsHostHostPropagated" depsHostHostPropagated
            );
        propagatedHostTargetOutputs =
          if propagatedBuildInputs == [ ] then
            [ ]
          else
            map (drv: getDev drv.__spliced.hostTarget or drv) (
              checkDependencyList "propagatedBuildInputs" propagatedBuildInputs
            );
        propagatedTargetTargetOutputs =
          if depsTargetTargetPropagated == [ ] then
            [ ]
          else
            map (drv: getDev drv.__spliced.targetTarget or drv) (
              checkDependencyList "depsTargetTargetPropagated" depsTargetTargetPropagated
            );
        allPropagatedDependencies = concatLists [
          propagatedBuildBuildOutputs
          propagatedBuildHostOutputs
          propagatedBuildTargetOutputs
          propagatedHostHostOutputs
          propagatedHostTargetOutputs
          propagatedTargetTargetOutputs
        ];

        derivationArg = removeAttrs attrs removedOrReplacedAttrNames // {
          ${if (attrs ? name || (attrs ? pname && attrs ? version)) then "name" else null} =
            let
              # Indicate the host platform of the derivation if cross compiling.
              # Fixed-output derivations like source tarballs shouldn't get a host
              # suffix. But we have some weird ones with run-time deps that are
              # just used for their side-affects. Those might as well since the
              # hash can't be the same. See #32986.
              hostSuffix = optionalString (
                hostSuffixNecessary
                && (
                  !(attrs ? outputHash)
                  ||
                    depsBuildTarget == [ ]
                    && depsBuildTargetPropagated == [ ]
                    && depsHostHost == [ ]
                    && depsHostHostPropagated == [ ]
                    && buildInputs == [ ]
                    && propagatedBuildInputs == [ ]
                    && depsTargetTarget == [ ]
                    && depsTargetTargetPropagated == [ ]

                )
              ) stdenvHostSuffix;

              # Disambiguate statically built packages. This was originally
              # introduce as a means to prevent nix-env to get confused between
              # nix and nixStatic. This should be also achieved by moving the
              # hostSuffix before the version, so we could contemplate removing
              # it again.
              staticMarker = stdenvStaticMarker;
            in
            sanitizeDerivationName (
              if attrs ? name then
                attrs.name + hostSuffix
              else
                # we cannot coerce null to a string below
                assert
                  (attrs ? version && attrs.version != null) || throw "The `version` attribute cannot be null.";
                "${attrs.pname}${staticMarker}${hostSuffix}-${attrs.version}"
            );

          builder = attrs.realBuilder or stdenvShell;
          args =
            attrs.args or (
              if attrs ? builder then
                [
                  "-e"
                  ./source-stdenv.sh
                  attrs.builder
                ]
              else
                defaultBuilderArgs
            );
          inherit stdenv;

          # The `system` attribute of a derivation has special meaning to Nix.
          # Derivations set it to choose what sort of machine could be used to
          # execute the build, The build platform entirely determines this,
          # indeed more finely than Nix knows or cares about. The `system`
          # attribute of `buildPlatform` matches Nix's degree of specificity.
          # exactly.
          system = buildPlatformSystem;

          inherit userHook;
          __ignoreNulls = true;
          inherit __structuredAttrs strictDeps;

          depsBuildBuild = buildBuildOutputs;
          nativeBuildInputs = buildHostOutputs;
          depsBuildTarget = buildTargetOutputs;
          depsHostHost = hostHostOutputs;
          buildInputs = hostTargetOutputs;
          depsTargetTarget = targetTargetOutputs;

          depsBuildBuildPropagated = propagatedBuildBuildOutputs;
          propagatedNativeBuildInputs = propagatedBuildHostOutputs;
          depsBuildTargetPropagated = propagatedBuildTargetOutputs;
          depsHostHostPropagated = propagatedHostHostOutputs;
          propagatedBuildInputs = propagatedHostTargetOutputs;
          depsTargetTargetPropagated = propagatedTargetTargetOutputs;

          configureFlags =
            configureFlags
            ++ (
              if configurePlatforms == defaultConfigurePlatforms then
                defaultConfigurePlatformsFlags
              else
                optional (elem "build" configurePlatforms) buildPlatformConfigureFlag
                ++ optional (elem "host" configurePlatforms) hostPlatformConfigureFlag
                ++ optional (elem "target" configurePlatforms) targetPlatformConfigureFlag
            );

          inherit patches;

          inherit doCheck doInstallCheck;

          inherit outputs;

          # When the derivations is content addressed provide default values
          # for outputHashMode and outputHashAlgo because most people won't
          # care about these anyways
          ${if __contentAddressed then "__contentAddressed" else null} = __contentAddressed;
          ${if __contentAddressed then "outputHashAlgo" else null} = attrs.outputHashAlgo or "sha256";
          ${if __contentAddressed then "outputHashMode" else null} = attrs.outputHashMode or "recursive";

          ${if enableParallelBuilding then "enableParallelBuilding" else null} = enableParallelBuilding;
          ${if enableParallelBuilding then "enableParallelChecking" else null} =
            attrs.enableParallelChecking or true;
          ${if enableParallelBuilding then "enableParallelInstalling" else null} =
            attrs.enableParallelInstalling or true;

          ${
            if (hardeningDisable != [ ] || hardeningEnable != [ ] || isMusl) then
              "NIX_HARDENING_ENABLE"
            else
              null
          } =
            concatStringsSep " " (
              if elem "all" hardeningDisable then
                [ ]
              else
                filter (
                  flag:
                  !(elem flag hardeningDisable)
                  # disabling fortify implies fortify3 should also be disabled
                  && (flag == "fortify3" -> !elem "fortify" hardeningDisable)
                  # disabling strictflexarrays1 implies strictflexarrays3 should also be disabled
                  && (flag == "strictflexarrays3" -> !elem "strictflexarrays1" hardeningDisable)
                  # disabling libcxxhardeningfast implies libcxxhardeningextensive should also be disabled
                  && (flag == "libcxxhardeningextensive" -> !elem "libcxxhardeningfast" hardeningDisable)
                ) (defaultHardeningFlags ++ hardeningEnable)
            );

          # TODO: remove platform condition
          # Enabling this check could be a breaking change as it requires to edit nix.conf
          # NixOS module already sets gccarch, unsure of nix installers and other distributions
          ${if requiredSystemFeaturesShouldBeSet then "requiredSystemFeatures" else null} =
            attrs.requiredSystemFeatures or [ ] ++ gccArchFeature;

          # -- Darwin-specific attrs --
          ${if buildIsDarwin then "__darwinAllowLocalNetworking" else null} = __darwinAllowLocalNetworking;
          ${if buildIsDarwin then "__sandboxProfile" else null} =
            let
              computedSandboxProfile = concatMap (input: input.__propagatedSandboxProfile or [ ]) (
                extraNativeBuildInputs ++ extraBuildInputs ++ allDependencies
              );
              computedPropagatedSandboxProfile = concatMap (
                input: input.__propagatedSandboxProfile or [ ]
              ) allPropagatedDependencies;
              profiles = [
                extraSandboxProfile
              ]
              ++ computedSandboxProfile
              ++ computedPropagatedSandboxProfile
              ++ [
                propagatedSandboxProfile
                sandboxProfile
              ];
            in
            # TODO: remove `unique` once nix has a list canonicalization primitive
            concatStringsSep "\n" (filter (x: x != "") (unique profiles));
          ${if buildIsDarwin then "__propagatedSandboxProfile" else null} =
            let
              computedPropagatedSandboxProfile = concatMap (
                input: input.__propagatedSandboxProfile or [ ]
              ) allPropagatedDependencies;
            in
            unique (computedPropagatedSandboxProfile ++ [ propagatedSandboxProfile ]);
          ${if buildIsDarwin then "__impureHostDeps" else null} =
            let
              computedImpureHostDeps = unique (
                concatMap (input: input.__propagatedImpureHostDeps or [ ]) (
                  extraNativeBuildInputs ++ extraBuildInputs ++ allDependencies
                )
              );
              computedPropagatedImpureHostDeps = unique (
                concatMap (input: input.__propagatedImpureHostDeps or [ ]) allPropagatedDependencies
              );
            in
            computedImpureHostDeps
            ++ computedPropagatedImpureHostDeps
            ++ __propagatedImpureHostDeps
            ++ __impureHostDeps
            ++ __extraImpureHostDeps
            ++ [
              "/dev/zero"
              "/dev/random"
              "/dev/urandom"
              "/bin/sh"
            ];
          ${if buildIsDarwin then "__propagatedImpureHostDeps" else null} =
            let
              computedPropagatedImpureHostDeps = unique (
                concatMap (input: input.__propagatedImpureHostDeps or [ ]) allPropagatedDependencies
              );
            in
            computedPropagatedImpureHostDeps ++ __propagatedImpureHostDeps;

          # -- Windows/Cygwin-specific attrs --
          ${if isWindows || isCygwin then "allowedImpureDLLs" else null} =
            allowedImpureDLLs
            ++ optionals isCygwin [
              "KERNEL32.dll"
            ];

          # -- Output reference checks --
          ${if !__structuredAttrs && attrs ? disallowedReferences then "disallowedReferences" else null} =
            map unsafeDerivationToUntrackedOutpath attrs.disallowedReferences;
          ${if !__structuredAttrs && attrs ? disallowedRequisites then "disallowedRequisites" else null} =
            map unsafeDerivationToUntrackedOutpath attrs.disallowedRequisites;
          ${if !__structuredAttrs && attrs ? allowedReferences then "allowedReferences" else null} =
            mapNullable unsafeDerivationToUntrackedOutpath attrs.allowedReferences;
          ${if !__structuredAttrs && attrs ? allowedRequisites then "allowedRequisites" else null} =
            mapNullable unsafeDerivationToUntrackedOutpath attrs.allowedRequisites;
          ${if __structuredAttrs then "outputChecks" else null} =
            let
              attrsOutputChecks = makeOutputChecks attrs;
              attrsOutputChecksFiltered = filterAttrs (_: v: v != null) attrsOutputChecks;
            in
            # to avoid the listToAttrs in most common situations, we replicate
            # what it would produce for most derivations. this can be improved
            # in the future at the cost of a mass rebuild - empty attrsets for
            # each output is a noop
            if
              !attrs ? outputs
              && !attrs ? outputChecks
              && (attrsOutputChecks == { } || attrsOutputChecksFiltered == { })
            then
              if separateDebugInfo' then debugCachedOutputChecks else cachedOutputChecks
            else
              listToAttrs (
                map (name: {
                  inherit name;
                  value =
                    let
                      raw = zipAttrsWith (_: concatLists) [
                        attrsOutputChecksFiltered
                        (makeOutputChecks (attrs.outputChecks.${name} or { }))
                      ];
                    in
                    # separateDebugInfo = true will put all sorts of files in
                    # the debug output which could carry references, but
                    # that's "normal". Notably it symlinks to the source.
                    # So disable reference checking for the debug output
                    if separateDebugInfo' && name == "debug" then
                      removeAttrs raw referenceCheckingAttrsToRemove
                    else
                      raw;
                }) outputs
              );
        };
      in
      derivationArg;

  mkDerivationSimple =
    overrideAttrs:

    # `mkDerivation` wraps the builtin `derivation` function to
    # produce derivations that use this stdenv and its shell.
    #
    # Internally, it delegates most of its behavior to `makeDerivationArgument`,
    # except for the `env`, `cmakeFlags`, and `mesonFlags` attributes, as well
    # as the attributes `meta` and `passthru` that affect [package attributes],
    # and not the derivation itself.
    #
    # See also:
    #
    # * https://nixos.org/nixpkgs/manual/#sec-using-stdenv
    #   Details on how to use this mkDerivation function
    #
    # * https://nixos.org/manual/nix/stable/expressions/derivations.html#derivations
    #   Explanation about derivations in general
    #
    # * [package attributes]: https://nixos.org/manual/nix/stable/glossary#package-attribute-set
    {

      # Configure Phase
      cmakeFlags ? [ ],
      mesonFlags ? [ ],

      meta ? { },
      passthru ? { },
      pos ? # position used in error messages and for meta.position
        (
          if attrs.meta.description or null != null then
            unsafeGetAttrPos "description" attrs.meta
          else if attrs.version or null != null then
            unsafeGetAttrPos "version" attrs
          else
            unsafeGetAttrPos "name" attrs
        ),

      # Experimental.  For simple packages mostly just works,
      # but for anything complex, be prepared to debug if enabling.
      __structuredAttrs ? structuredAttrsByDefault,

      env ? { },

      ...
    }@attrs:

    # Policy on acceptable hash types in nixpkgs
    assert
      attrs ? outputHash
      -> (
        let
          algo = attrs.outputHashAlgo or (head (splitString "-" attrs.outputHash));
        in
        if algo == "md5" then throw "Rejected insecure ${algo} hash '${attrs.outputHash}'" else true
      );

    let
      env' =
        if attrs ? meta.mainProgram then env // { NIX_MAIN_PROGRAM = attrs.meta.mainProgram; } else env;

      derivationArg = makeDerivationArgument (
        removeAttrs attrs argumentAttrsToRemove
        // {
          ${if __structuredAttrs then "env" else null} = checkedEnv;
          cmakeFlags = makeCMakeFlags attrs;
          mesonFlags = makeMesonFlags attrs;
        }
      );

      meta = commonMeta {
        inherit validity attrs pos;
        references =
          attrs.nativeBuildInputs or [ ]
          ++ attrs.buildInputs or [ ]
          ++ attrs.propagatedNativeBuildInputs or [ ]
          ++ attrs.propagatedBuildInputs or [ ];
      };
      validity = assertValidity { inherit meta attrs; };

      checkedEnv =
        let
          overlappingArgs = intersectAttrs env' derivationArg;
        in
        assert
          (isAttrs env && !isDerivation env)
          || throw "`env` must be an attribute set of environment variables. Set `env.env` or pick a more specific name.";
        assert
          (overlappingArgs == { })
          || throw (
            let
              errors = concatMapStringsSep "\n" (
                name:
                "  - ${name}: in `env`: ${toPretty { } env'.${name}}; in derivation arguments: ${
                    toPretty { } derivationArg.${name}
                  }"
              ) (attrNames overlappingArgs);

            in
            "The `env` attribute set cannot contain any attributes passed to derivation. The following attributes are overlapping:\n${errors}"
          );
        mapAttrs (
          n: v:
          assert
            (isString v || isBool v || isInt v || isDerivation v)
            || throw "The `env` attribute set can only contain derivation, string, boolean or integer attributes. The `${n}` attribute is of type ${typeOf v}.";
          v
        ) env';
    in

    extendDerivation validity.handled (
      {
        # A derivation that always builds successfully and whose runtime
        # dependencies are the original derivations build time dependencies
        # This allows easy building and distributing of all derivations
        # needed to enter a nix-shell with
        #   nix-build shell.nix -A inputDerivation
        inputDerivation = derivation (
          removeAttrs derivationArg attrsToRemoveLast
          // {
            # Add a name in case the original drv didn't have one
            name = "inputDerivation" + optionalString (derivationArg ? name) "-${derivationArg.name}";
            # This always only has one output
            outputs = [ "out" ];
            # This doesn’t require any system features even if the original
            # derivation did.
            requiredSystemFeatures = [ ];

            # Propagate the original builder and arguments, since we override
            # them and they might contain references to build inputs
            _derivation_original_builder = derivationArg.builder;
            _derivation_original_args = derivationArg.args;

            builder = stdenvShell;
            # The builtin `declare -p` dumps all bash and environment variables,
            # which is where all build input references end up (e.g. $PATH for
            # binaries). By writing this to $out, Nix can find and register
            # them as runtime dependencies (since Nix greps for store paths
            # through $out to find them). Using placeholder for $out works with
            # and without structuredAttrs.
            # This build script does not use setup.sh or stdenv, to keep
            # the env most pristine. This gives us a very bare bones env,
            # hence the extra/duplicated compatibility logic and "pure bash" style.
            args = [
              "-c"
              ''
                out="${placeholder "out"}"
                if [ -e "$NIX_ATTRS_SH_FILE" ]; then . "$NIX_ATTRS_SH_FILE"; fi
                declare -p > $out
                for var in $passAsFile; do
                    pathVar="''${var}Path"
                    printf "%s" "$(< "''${!pathVar}")" >> $out
                done
              ''
            ];
          }
        );

        inherit passthru overrideAttrs;
        inherit meta;
      }
      //
        # Pass through extra attributes that are not inputs, but
        # should be made available to Nix expressions using the
        # derivation (e.g., in assertions).
        passthru
    ) (derivation (derivationArg // checkedEnv));

in
{
  inherit mkDerivation;
}