mirror of
https://github.com/NixOS/nixpkgs.git
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643 lines
26 KiB
Nix
643 lines
26 KiB
Nix
{ lib, config }:
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stdenv:
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let
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# Lib attributes are inherited to the lexical scope for performance reasons.
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inherit (lib)
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any
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assertMsg
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attrNames
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boolToString
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concatLists
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concatMap
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concatMapStrings
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concatStringsSep
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elem
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elemAt
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extendDerivation
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filter
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findFirst
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getDev
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head
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imap1
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isAttrs
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isBool
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isDerivation
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isInt
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isList
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isString
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mapAttrs
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mapNullable
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optional
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optionalAttrs
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optionalString
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optionals
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remove
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splitString
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subtractLists
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unique
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;
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inherit (import ../../build-support/lib/cmake.nix { inherit lib stdenv; }) makeCMakeFlags;
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inherit (import ../../build-support/lib/meson.nix { inherit lib stdenv; }) makeMesonFlags;
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mkDerivation =
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fnOrAttrs:
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if builtins.isFunction fnOrAttrs
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then makeDerivationExtensible fnOrAttrs
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else makeDerivationExtensibleConst fnOrAttrs;
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checkMeta = import ./check-meta.nix {
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inherit lib config;
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# Nix itself uses the `system` field of a derivation to decide where
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# to build it. This is a bit confusing for cross compilation.
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inherit (stdenv) hostPlatform;
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};
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# Based off lib.makeExtensible, with modifications:
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makeDerivationExtensible = rattrs:
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let
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# NOTE: The following is a hint that will be printed by the Nix cli when
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# encountering an infinite recursion. It must not be formatted into
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# separate lines, because Nix would only show the last line of the comment.
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# 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`.
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args = rattrs (args // { inherit finalPackage overrideAttrs; });
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# ^^^^
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overrideAttrs = f0:
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let
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f = self: super:
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# Convert f0 to an overlay. Legacy is:
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# overrideAttrs (super: {})
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# We want to introduce self. We follow the convention of overlays:
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# overrideAttrs (self: super: {})
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# Which means the first parameter can be either self or super.
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# This is surprising, but far better than the confusion that would
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# arise from flipping an overlay's parameters in some cases.
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let x = f0 super;
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in
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if builtins.isFunction x
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then
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# Can't reuse `x`, because `self` comes first.
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# Looks inefficient, but `f0 super` was a cheap thunk.
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f0 self super
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else x;
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in
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makeDerivationExtensible
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(self: let super = rattrs self; in super // (if builtins.isFunction f0 || f0?__functor then f self super else f0));
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finalPackage =
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mkDerivationSimple overrideAttrs args;
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in finalPackage;
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#makeDerivationExtensibleConst = attrs: makeDerivationExtensible (_: attrs);
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# but pre-evaluated for a slight improvement in performance.
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makeDerivationExtensibleConst = attrs:
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mkDerivationSimple
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(f0:
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let
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f = self: super:
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let x = f0 super;
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in
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if builtins.isFunction x
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then
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f0 self super
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else x;
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in
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makeDerivationExtensible (self: attrs // (if builtins.isFunction f0 || f0?__functor then f self attrs else f0)))
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attrs;
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knownHardeningFlags = [
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"bindnow"
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"format"
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"fortify"
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"fortify3"
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"pic"
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"pie"
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"relro"
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"stackprotector"
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"strictoverflow"
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"trivialautovarinit"
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"zerocallusedregs"
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];
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removedOrReplacedAttrNames = [
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"checkInputs" "installCheckInputs"
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"nativeCheckInputs" "nativeInstallCheckInputs"
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"__contentAddressed"
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"__darwinAllowLocalNetworking"
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"__impureHostDeps" "__propagatedImpureHostDeps"
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"sandboxProfile" "propagatedSandboxProfile"
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];
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# Turn a derivation into its outPath without a string context attached.
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# See the comment at the usage site.
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unsafeDerivationToUntrackedOutpath = drv:
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if isDerivation drv
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then builtins.unsafeDiscardStringContext drv.outPath
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else drv;
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makeDerivationArgument =
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# `makeDerivationArgument` is responsible for the `mkDerivation` arguments that
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# affect the actual derivation, excluding a few behaviors that are not
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# essential, and specific to `mkDerivation`: `env`, `cmakeFlags`, `mesonFlags`.
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#
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# See also:
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#
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# * https://nixos.org/nixpkgs/manual/#sec-using-stdenv
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# Details on how to use this mkDerivation function
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#
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# * https://nixos.org/manual/nix/stable/expressions/derivations.html#derivations
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# Explanation about derivations in general
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{
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# These types of dependencies are all exhaustively documented in
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# the "Specifying Dependencies" section of the "Standard
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# Environment" chapter of the Nixpkgs manual.
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# TODO(@Ericson2314): Stop using legacy dep attribute names
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# host offset -> target offset
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depsBuildBuild ? [] # -1 -> -1
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, depsBuildBuildPropagated ? [] # -1 -> -1
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, nativeBuildInputs ? [] # -1 -> 0 N.B. Legacy name
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, propagatedNativeBuildInputs ? [] # -1 -> 0 N.B. Legacy name
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, depsBuildTarget ? [] # -1 -> 1
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, depsBuildTargetPropagated ? [] # -1 -> 1
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, depsHostHost ? [] # 0 -> 0
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, depsHostHostPropagated ? [] # 0 -> 0
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, buildInputs ? [] # 0 -> 1 N.B. Legacy name
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, propagatedBuildInputs ? [] # 0 -> 1 N.B. Legacy name
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, depsTargetTarget ? [] # 1 -> 1
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, depsTargetTargetPropagated ? [] # 1 -> 1
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, checkInputs ? []
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, installCheckInputs ? []
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, nativeCheckInputs ? []
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, nativeInstallCheckInputs ? []
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# Configure Phase
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, configureFlags ? []
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, # Target is not included by default because most programs don't care.
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# Including it then would cause needless mass rebuilds.
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#
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# TODO(@Ericson2314): Make [ "build" "host" ] always the default / resolve #87909
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configurePlatforms ? optionals
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(stdenv.hostPlatform != stdenv.buildPlatform || config.configurePlatformsByDefault)
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[ "build" "host" ]
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# TODO(@Ericson2314): Make unconditional / resolve #33599
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# Check phase
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, doCheck ? config.doCheckByDefault or false
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# TODO(@Ericson2314): Make unconditional / resolve #33599
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# InstallCheck phase
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, doInstallCheck ? config.doCheckByDefault or false
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, # TODO(@Ericson2314): Make always true and remove / resolve #178468
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strictDeps ? if config.strictDepsByDefault then true else stdenv.hostPlatform != stdenv.buildPlatform
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, enableParallelBuilding ? config.enableParallelBuildingByDefault
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, separateDebugInfo ? false
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, outputs ? [ "out" ]
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, __darwinAllowLocalNetworking ? false
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, __impureHostDeps ? []
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, __propagatedImpureHostDeps ? []
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, sandboxProfile ? ""
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, propagatedSandboxProfile ? ""
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, hardeningEnable ? []
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, hardeningDisable ? []
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, patches ? []
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, __contentAddressed ?
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(! attrs ? outputHash) # Fixed-output drvs can't be content addressed too
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&& config.contentAddressedByDefault
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# Experimental. For simple packages mostly just works,
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# but for anything complex, be prepared to debug if enabling.
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, __structuredAttrs ? config.structuredAttrsByDefault or false
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, ... } @ attrs:
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# Policy on acceptable hash types in nixpkgs
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assert attrs ? outputHash -> (
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let algo =
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attrs.outputHashAlgo or (head (splitString "-" attrs.outputHash));
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in
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if algo == "md5" then
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throw "Rejected insecure ${algo} hash '${attrs.outputHash}'"
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else
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true
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);
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let
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# TODO(@oxij, @Ericson2314): This is here to keep the old semantics, remove when
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# no package has `doCheck = true`.
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doCheck' = doCheck && stdenv.buildPlatform.canExecute stdenv.hostPlatform;
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doInstallCheck' = doInstallCheck && stdenv.buildPlatform.canExecute stdenv.hostPlatform;
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separateDebugInfo' = separateDebugInfo && stdenv.hostPlatform.isLinux;
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outputs' = outputs ++ optional separateDebugInfo' "debug";
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noNonNativeDeps = builtins.length (depsBuildTarget ++ depsBuildTargetPropagated
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++ depsHostHost ++ depsHostHostPropagated
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++ buildInputs ++ propagatedBuildInputs
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++ depsTargetTarget ++ depsTargetTargetPropagated) == 0;
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dontAddHostSuffix = attrs ? outputHash && !noNonNativeDeps || !stdenv.hasCC;
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hardeningDisable' = if any (x: x == "fortify") hardeningDisable
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# disabling fortify implies fortify3 should also be disabled
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then unique (hardeningDisable ++ [ "fortify3" ])
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else hardeningDisable;
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defaultHardeningFlags =
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(if stdenv.hasCC then stdenv.cc else {}).defaultHardeningFlags or
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# fallback safe-ish set of flags
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(remove "pie" knownHardeningFlags);
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enabledHardeningOptions =
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if builtins.elem "all" hardeningDisable'
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then []
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else subtractLists hardeningDisable' (defaultHardeningFlags ++ hardeningEnable);
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# hardeningDisable additionally supports "all".
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erroneousHardeningFlags = subtractLists knownHardeningFlags (hardeningEnable ++ remove "all" hardeningDisable);
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checkDependencyList = checkDependencyList' [];
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checkDependencyList' = positions: name: deps:
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imap1
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(index: dep:
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if isDerivation dep || dep == null || builtins.isString dep || builtins.isPath dep then dep
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else if isList dep then checkDependencyList' ([index] ++ positions) name dep
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else throw "Dependency is not of a valid type: ${concatMapStrings (ix: "element ${toString ix} of ") ([index] ++ positions)}${name} for ${attrs.name or attrs.pname}")
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deps;
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in if builtins.length erroneousHardeningFlags != 0
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then abort ("mkDerivation was called with unsupported hardening flags: " + lib.generators.toPretty {} {
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inherit erroneousHardeningFlags hardeningDisable hardeningEnable knownHardeningFlags;
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})
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else let
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doCheck = doCheck';
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doInstallCheck = doInstallCheck';
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buildInputs' = buildInputs
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++ optionals doCheck checkInputs
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++ optionals doInstallCheck installCheckInputs;
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nativeBuildInputs' = nativeBuildInputs
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++ optional separateDebugInfo' ../../build-support/setup-hooks/separate-debug-info.sh
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++ optional stdenv.hostPlatform.isWindows ../../build-support/setup-hooks/win-dll-link.sh
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++ optionals doCheck nativeCheckInputs
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++ optionals doInstallCheck nativeInstallCheckInputs;
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outputs = outputs';
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dependencies = [
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[
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(map (drv: getDev drv.__spliced.buildBuild or drv) (checkDependencyList "depsBuildBuild" depsBuildBuild))
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(map (drv: getDev drv.__spliced.buildHost or drv) (checkDependencyList "nativeBuildInputs" nativeBuildInputs'))
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(map (drv: getDev drv.__spliced.buildTarget or drv) (checkDependencyList "depsBuildTarget" depsBuildTarget))
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]
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[
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(map (drv: getDev drv.__spliced.hostHost or drv) (checkDependencyList "depsHostHost" depsHostHost))
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(map (drv: getDev drv.__spliced.hostTarget or drv) (checkDependencyList "buildInputs" buildInputs'))
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]
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[
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(map (drv: getDev drv.__spliced.targetTarget or drv) (checkDependencyList "depsTargetTarget" depsTargetTarget))
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]
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];
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propagatedDependencies = [
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[
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(map (drv: getDev drv.__spliced.buildBuild or drv) (checkDependencyList "depsBuildBuildPropagated" depsBuildBuildPropagated))
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(map (drv: getDev drv.__spliced.buildHost or drv) (checkDependencyList "propagatedNativeBuildInputs" propagatedNativeBuildInputs))
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(map (drv: getDev drv.__spliced.buildTarget or drv) (checkDependencyList "depsBuildTargetPropagated" depsBuildTargetPropagated))
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]
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[
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(map (drv: getDev drv.__spliced.hostHost or drv) (checkDependencyList "depsHostHostPropagated" depsHostHostPropagated))
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(map (drv: getDev drv.__spliced.hostTarget or drv) (checkDependencyList "propagatedBuildInputs" propagatedBuildInputs))
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]
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[
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(map (drv: getDev drv.__spliced.targetTarget or drv) (checkDependencyList "depsTargetTargetPropagated" depsTargetTargetPropagated))
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]
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];
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derivationArg =
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removeAttrs attrs removedOrReplacedAttrNames
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// (optionalAttrs (attrs ? name || (attrs ? pname && attrs ? version)) {
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name =
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let
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# Indicate the host platform of the derivation if cross compiling.
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# Fixed-output derivations like source tarballs shouldn't get a host
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# suffix. But we have some weird ones with run-time deps that are
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# just used for their side-affects. Those might as well since the
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# hash can't be the same. See #32986.
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hostSuffix = optionalString
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(stdenv.hostPlatform != stdenv.buildPlatform && !dontAddHostSuffix)
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"-${stdenv.hostPlatform.config}";
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# Disambiguate statically built packages. This was originally
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# introduce as a means to prevent nix-env to get confused between
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# nix and nixStatic. This should be also achieved by moving the
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# hostSuffix before the version, so we could contemplate removing
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# it again.
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staticMarker = optionalString stdenv.hostPlatform.isStatic "-static";
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in
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lib.strings.sanitizeDerivationName (
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if attrs ? name
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then attrs.name + hostSuffix
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else
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# we cannot coerce null to a string below
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assert assertMsg (attrs ? version && attrs.version != null) "The ‘version’ attribute cannot be null.";
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"${attrs.pname}${staticMarker}${hostSuffix}-${attrs.version}"
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);
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}) // {
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builder = attrs.realBuilder or stdenv.shell;
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args = attrs.args or ["-e" (attrs.builder or ./default-builder.sh)];
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inherit stdenv;
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# The `system` attribute of a derivation has special meaning to Nix.
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# Derivations set it to choose what sort of machine could be used to
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# execute the build, The build platform entirely determines this,
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# indeed more finely than Nix knows or cares about. The `system`
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# attribute of `buildPlatfom` matches Nix's degree of specificity.
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# exactly.
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inherit (stdenv.buildPlatform) system;
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userHook = config.stdenv.userHook or null;
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__ignoreNulls = true;
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inherit __structuredAttrs strictDeps;
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depsBuildBuild = elemAt (elemAt dependencies 0) 0;
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nativeBuildInputs = elemAt (elemAt dependencies 0) 1;
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depsBuildTarget = elemAt (elemAt dependencies 0) 2;
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depsHostHost = elemAt (elemAt dependencies 1) 0;
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buildInputs = elemAt (elemAt dependencies 1) 1;
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depsTargetTarget = elemAt (elemAt dependencies 2) 0;
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depsBuildBuildPropagated = elemAt (elemAt propagatedDependencies 0) 0;
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propagatedNativeBuildInputs = elemAt (elemAt propagatedDependencies 0) 1;
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depsBuildTargetPropagated = elemAt (elemAt propagatedDependencies 0) 2;
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depsHostHostPropagated = elemAt (elemAt propagatedDependencies 1) 0;
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propagatedBuildInputs = elemAt (elemAt propagatedDependencies 1) 1;
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depsTargetTargetPropagated = elemAt (elemAt propagatedDependencies 2) 0;
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# This parameter is sometimes a string, sometimes null, and sometimes a list, yuck
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configureFlags =
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configureFlags
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++ optional (elem "build" configurePlatforms) "--build=${stdenv.buildPlatform.config}"
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++ optional (elem "host" configurePlatforms) "--host=${stdenv.hostPlatform.config}"
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++ optional (elem "target" configurePlatforms) "--target=${stdenv.targetPlatform.config}";
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inherit patches;
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inherit doCheck doInstallCheck;
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inherit outputs;
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} // optionalAttrs (__contentAddressed) {
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inherit __contentAddressed;
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# Provide default values for outputHashMode and outputHashAlgo because
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# most people won't care about these anyways
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outputHashAlgo = attrs.outputHashAlgo or "sha256";
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outputHashMode = attrs.outputHashMode or "recursive";
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} // optionalAttrs (enableParallelBuilding) {
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inherit enableParallelBuilding;
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enableParallelChecking = attrs.enableParallelChecking or true;
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enableParallelInstalling = attrs.enableParallelInstalling or true;
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} // optionalAttrs (hardeningDisable != [] || hardeningEnable != [] || stdenv.hostPlatform.isMusl) {
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NIX_HARDENING_ENABLE = enabledHardeningOptions;
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} // optionalAttrs (stdenv.hostPlatform.isx86_64 && stdenv.hostPlatform ? gcc.arch) {
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requiredSystemFeatures = attrs.requiredSystemFeatures or [] ++ [ "gccarch-${stdenv.hostPlatform.gcc.arch}" ];
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} // optionalAttrs (stdenv.buildPlatform.isDarwin) (
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let
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allDependencies = concatLists (concatLists dependencies);
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allPropagatedDependencies = concatLists (concatLists propagatedDependencies);
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computedSandboxProfile =
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concatMap (input: input.__propagatedSandboxProfile or [])
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(stdenv.extraNativeBuildInputs
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++ stdenv.extraBuildInputs
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++ allDependencies);
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computedPropagatedSandboxProfile =
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concatMap (input: input.__propagatedSandboxProfile or [])
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allPropagatedDependencies;
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computedImpureHostDeps =
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unique (concatMap (input: input.__propagatedImpureHostDeps or [])
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(stdenv.extraNativeBuildInputs
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++ stdenv.extraBuildInputs
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++ allDependencies));
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computedPropagatedImpureHostDeps =
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unique (concatMap (input: input.__propagatedImpureHostDeps or [])
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allPropagatedDependencies);
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in {
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inherit __darwinAllowLocalNetworking;
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# TODO: remove `unique` once nix has a list canonicalization primitive
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__sandboxProfile =
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let profiles = [ stdenv.extraSandboxProfile ] ++ computedSandboxProfile ++ computedPropagatedSandboxProfile ++ [ propagatedSandboxProfile sandboxProfile ];
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final = concatStringsSep "\n" (filter (x: x != "") (unique profiles));
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in final;
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__propagatedSandboxProfile = unique (computedPropagatedSandboxProfile ++ [ propagatedSandboxProfile ]);
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__impureHostDeps = computedImpureHostDeps ++ computedPropagatedImpureHostDeps ++ __propagatedImpureHostDeps ++ __impureHostDeps ++ stdenv.__extraImpureHostDeps ++ [
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"/dev/zero"
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"/dev/random"
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"/dev/urandom"
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"/bin/sh"
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];
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__propagatedImpureHostDeps = computedPropagatedImpureHostDeps ++ __propagatedImpureHostDeps;
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}) //
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# If we use derivations directly here, they end up as build-time dependencies.
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# This is especially problematic in the case of disallowed*, since the disallowed
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# derivations will be built by nix as build-time dependencies, while those
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# derivations might take a very long time to build, or might not even build
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# successfully on the platform used.
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# We can improve on this situation by instead passing only the outPath,
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# without an attached string context, to nix. The out path will be a placeholder
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# which will be replaced by the actual out path if the derivation in question
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# is part of the final closure (and thus needs to be built). If it is not
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# 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
|
||
optionalAttrs (attrs ? disallowedReferences) {
|
||
disallowedReferences =
|
||
map unsafeDerivationToUntrackedOutpath attrs.disallowedReferences;
|
||
} //
|
||
optionalAttrs (attrs ? disallowedRequisites) {
|
||
disallowedRequisites =
|
||
map unsafeDerivationToUntrackedOutpath attrs.disallowedRequisites;
|
||
} //
|
||
optionalAttrs (attrs ? allowedReferences) {
|
||
allowedReferences =
|
||
mapNullable unsafeDerivationToUntrackedOutpath attrs.allowedReferences;
|
||
} //
|
||
optionalAttrs (attrs ? allowedRequisites) {
|
||
allowedRequisites =
|
||
mapNullable unsafeDerivationToUntrackedOutpath attrs.allowedRequisites;
|
||
};
|
||
|
||
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 builtins.unsafeGetAttrPos "description" attrs.meta
|
||
else if attrs.version or null != null
|
||
then builtins.unsafeGetAttrPos "version" attrs
|
||
else builtins.unsafeGetAttrPos "name" attrs)
|
||
|
||
# Experimental. For simple packages mostly just works,
|
||
# but for anything complex, be prepared to debug if enabling.
|
||
, __structuredAttrs ? config.structuredAttrsByDefault or false
|
||
|
||
, 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
|
||
envIsExportable = isAttrs env && !isDerivation env;
|
||
|
||
derivationArg = makeDerivationArgument
|
||
(removeAttrs
|
||
attrs
|
||
(["meta" "passthru" "pos"]
|
||
++ optional (__structuredAttrs || envIsExportable) "env"
|
||
)
|
||
// optionalAttrs __structuredAttrs { env = checkedEnv; }
|
||
// {
|
||
cmakeFlags = makeCMakeFlags attrs;
|
||
mesonFlags = makeMesonFlags attrs;
|
||
});
|
||
|
||
meta = checkMeta.commonMeta {
|
||
inherit validity attrs pos;
|
||
references = attrs.nativeBuildInputs or [] ++ attrs.buildInputs or []
|
||
++ attrs.propagatedNativeBuildInputs or [] ++ attrs.propagatedBuildInputs or [];
|
||
};
|
||
validity = checkMeta.assertValidity { inherit meta attrs; };
|
||
|
||
checkedEnv =
|
||
let
|
||
overlappingNames = attrNames (builtins.intersectAttrs env derivationArg);
|
||
in
|
||
assert assertMsg envIsExportable
|
||
"When using structured attributes, `env` must be an attribute set of environment variables.";
|
||
assert assertMsg (overlappingNames == [ ])
|
||
"The ‘env’ attribute set cannot contain any attributes passed to derivation. The following attributes are overlapping: ${concatStringsSep ", " overlappingNames}";
|
||
mapAttrs
|
||
(n: v: assert assertMsg (isString v || isBool v || isInt v || isDerivation v)
|
||
"The ‘env’ attribute set can only contain derivation, string, boolean or integer attributes. The ‘${n}’ attribute is of type ${builtins.typeOf v}."; v)
|
||
env;
|
||
|
||
# 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.
|
||
deleteFixedOutputRelatedAttrs = lib.flip builtins.removeAttrs [ "outputHashAlgo" "outputHash" "outputHashMode" ];
|
||
|
||
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 (deleteFixedOutputRelatedAttrs derivationArg // {
|
||
# Add a name in case the original drv didn't have one
|
||
name = derivationArg.name or "inputDerivation";
|
||
# This always only has one output
|
||
outputs = [ "out" ];
|
||
|
||
# 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 = stdenv.shell;
|
||
# The bash builtin `export` dumps all current 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)
|
||
args = [ "-c" ''
|
||
export > $out
|
||
for var in $passAsFile; do
|
||
pathVar="''${var}Path"
|
||
printf "%s" "$(< "''${!pathVar}")" >> $out
|
||
done
|
||
'' ];
|
||
|
||
# inputDerivation produces the inputs; not the outputs, so any
|
||
# restrictions on what used to be the outputs don't serve a purpose
|
||
# anymore.
|
||
allowedReferences = null;
|
||
allowedRequisites = null;
|
||
disallowedReferences = [ ];
|
||
disallowedRequisites = [ ];
|
||
});
|
||
|
||
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 // optionalAttrs envIsExportable checkedEnv));
|
||
|
||
in
|
||
{
|
||
inherit mkDerivation;
|
||
}
|