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make-package-set.nix
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make-package-set.nix
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# This expression takes a file like `hackage-packages.nix` and constructs
# a full package set out of that.
{ # package-set used for build tools (all of nixpkgs)
buildPackages
, # A haskell package set for Setup.hs, compiler plugins, and similar
# build-time uses.
buildHaskellPackages
, # package-set used for non-haskell dependencies (all of nixpkgs)
pkgs
, # stdenv provides our build and host platforms
stdenv
, # this module provides the list of known licenses and maintainers
lib
# needed for overrideCabal & packageSourceOverrides
, haskellLib
, # hashes for downloading Hackage packages
all-cabal-hashes
, # compiler to use
ghc
, # A function that takes `{ pkgs, lib, callPackage }` as the first arg and
# `self` as second, and returns a set of haskell packages
package-set
, # The final, fully overriden package set usable with the nixpkgs fixpoint
# overriding functionality
extensible-self
}:
# return value: a function from self to the package set
self:
let
inherit (stdenv) buildPlatform hostPlatform;
inherit (lib) fix' extends makeOverridable;
inherit (haskellLib) overrideCabal;
mkDerivationImpl = pkgs.callPackage ./generic-builder.nix {
inherit stdenv;
nodejs = buildPackages.nodejs-slim;
inherit (self) buildHaskellPackages ghc ghcWithHoogle ghcWithPackages;
inherit (self.buildHaskellPackages) jailbreak-cabal;
hscolour = overrideCabal self.buildHaskellPackages.hscolour (drv: {
isLibrary = false;
doHaddock = false;
hyperlinkSource = false; # Avoid depending on hscolour for this build.
postFixup = "rm -rf $out/lib $out/share $out/nix-support";
});
cpphs = overrideCabal (self.cpphs.overrideScope (self: super: {
mkDerivation = drv: super.mkDerivation (drv // {
enableSharedExecutables = false;
enableSharedLibraries = false;
doHaddock = false;
useCpphs = false;
});
})) (drv: {
isLibrary = false;
postFixup = "rm -rf $out/lib $out/share $out/nix-support";
});
};
mkDerivation = makeOverridable mkDerivationImpl;
# manualArgs are the arguments that were explictly passed to `callPackage`, like:
#
# callPackage foo { bar = null; };
#
# here `bar` is a manual argument.
callPackageWithScope = scope: fn: manualArgs:
let
# this code is copied from callPackage in lib/customisation.nix
#
# we cannot use `callPackage` here because we want to call `makeOverridable`
# on `drvScope` (we cannot add `overrideScope` after calling `callPackage` because then it is
# lost on `.override`) but determine the auto-args based on `drv` (the problem here
# is that nix has no way to "passthrough" args while preserving the reflection
# info that callPackage uses to determine the arguments).
drv = if lib.isFunction fn then fn else import fn;
auto = builtins.intersectAttrs (lib.functionArgs drv) scope;
# this wraps the `drv` function to add a `overrideScope` function to the result.
drvScope = allArgs: drv allArgs // {
overrideScope = f:
let newScope = mkScope (fix' (extends f scope.__unfix__));
# note that we have to be careful here: `allArgs` includes the auto-arguments that
# weren't manually specified. If we would just pass `allArgs` to the recursive call here,
# then we wouldn't look up any packages in the scope in the next interation, because it
# appears as if all arguments were already manually passed, so the scope change would do
# nothing.
in callPackageWithScope newScope drv manualArgs;
};
in lib.makeOverridable drvScope (auto // manualArgs);
mkScope = scope: let
ps = pkgs.__splicedPackages;
scopeSpliced = pkgs.splicePackages {
pkgsBuildBuild = scope.buildHaskellPackages.buildHaskellPackages;
pkgsBuildHost = scope.buildHaskellPackages;
pkgsBuildTarget = {};
pkgsHostHost = {};
pkgsHostTarget = scope;
pkgsTargetTarget = {};
} // {
# Don't splice these
inherit (scope) ghc buildHaskellPackages;
};
in ps // ps.xorg // ps.gnome2 // { inherit stdenv; } // scopeSpliced;
defaultScope = mkScope self;
callPackage = drv: args: callPackageWithScope defaultScope drv args;
withPackages = packages: buildPackages.callPackage ./with-packages-wrapper.nix {
inherit (self) ghc llvmPackages;
inherit packages;
};
# Use cabal2nix to create a default.nix for the package sources found at 'src'.
haskellSrc2nix = { name, src, sha256 ? null, extraCabal2nixOptions ? "" }:
let
sha256Arg = if sha256 == null then "--sha256=" else ''--sha256="${sha256}"'';
in buildPackages.stdenv.mkDerivation {
name = "cabal2nix-${name}";
nativeBuildInputs = [ buildPackages.cabal2nix-unwrapped ];
preferLocalBuild = true;
allowSubstitutes = false;
phases = ["installPhase"];
LANG = "en_US.UTF-8";
LOCALE_ARCHIVE = pkgs.lib.optionalString (buildPlatform.libc == "glibc") "${buildPackages.glibcLocales}/lib/locale/locale-archive";
installPhase = ''
export HOME="$TMP"
mkdir -p "$out"
cabal2nix --compiler=${self.ghc.haskellCompilerName} --system=${hostPlatform.config} ${sha256Arg} "${src}" ${extraCabal2nixOptions} > "$out/default.nix"
'';
};
all-cabal-hashes-component = name: version: buildPackages.runCommand "all-cabal-hashes-component-${name}-${version}" {} ''
tar --wildcards -xzvf ${all-cabal-hashes} \*/${name}/${version}/${name}.{json,cabal}
mkdir -p $out
mv */${name}/${version}/${name}.{json,cabal} $out
'';
hackage2nix = name: version: let component = all-cabal-hashes-component name version; in self.haskellSrc2nix {
name = "${name}-${version}";
sha256 = ''$(sed -e 's/.*"SHA256":"//' -e 's/".*$//' "${component}/${name}.json")'';
src = "${component}/${name}.cabal";
};
# Adds a nix file as an input to the haskell derivation it
# produces. This is useful for callHackage / callCabal2nix to
# prevent the generated default.nix from being garbage collected
# (requiring it to be frequently rebuilt), which can be an
# annoyance.
callPackageKeepDeriver = src: args:
overrideCabal (self.callPackage src args) (orig: {
preConfigure = ''
# Generated from ${src}
${orig.preConfigure or ""}
'';
passthru = orig.passthru or {} // {
# When using callCabal2nix or callHackage, it is often useful
# to debug a failure by inspecting the Nix expression
# generated by cabal2nix. This can be accessed via this
# cabal2nixDeriver field.
cabal2nixDeriver = src;
};
});
in package-set { inherit pkgs lib callPackage; } self // {
inherit mkDerivation callPackage haskellSrc2nix hackage2nix buildHaskellPackages;
inherit (haskellLib) packageSourceOverrides;
# callHackage :: Text -> Text -> AttrSet -> HaskellPackage
#
# e.g., while overriding a package set:
# '... foo = self.callHackage "foo" "1.5.3" {}; ...'
callHackage = name: version: callPackageKeepDeriver (self.hackage2nix name version);
# callHackageDirect
# :: { pkg :: Text, ver :: Text, sha256 :: Text }
# -> AttrSet
# -> HaskellPackage
#
# This function does not depend on all-cabal-hashes and therefore will work
# for any version that has been released on hackage as opposed to only
# versions released before whatever version of all-cabal-hashes you happen
# to be currently using.
callHackageDirect = {pkg, ver, sha256}:
let pkgver = "${pkg}-${ver}";
in self.callCabal2nix pkg (pkgs.fetchzip {
url = "mirror://hackage/${pkgver}/${pkgver}.tar.gz";
inherit sha256;
});
# Creates a Haskell package from a source package by calling cabal2nix on the source.
callCabal2nixWithOptions = name: src: extraCabal2nixOptions: args:
let
filter = path: type:
pkgs.lib.hasSuffix "${name}.cabal" path ||
baseNameOf path == "package.yaml";
expr = self.haskellSrc2nix {
inherit name extraCabal2nixOptions;
src = if pkgs.lib.canCleanSource src
then pkgs.lib.cleanSourceWith { inherit src filter; }
else src;
};
in overrideCabal (callPackageKeepDeriver expr args) (orig: {
inherit src;
});
callCabal2nix = name: src: args: self.callCabal2nixWithOptions name src "" args;
# : { root : Path
# , name : Defaulted String
# , source-overrides : Defaulted (Either Path VersionNumber)
# , overrides : Defaulted (HaskellPackageOverrideSet)
# , modifier : Defaulted
# , returnShellEnv : Defaulted
# , withHoogle : Defaulted
# , cabal2nixOptions : Defaulted
# } -> NixShellAwareDerivation
#
# Given a path to a haskell package directory, an optional package name
# which defaults to the base name of the path, an optional set of source
# overrides as appropriate for the 'packageSourceOverrides' function, an
# optional set of arbitrary overrides, and an optional haskell package
# modifier, return a derivation appropriate for nix-build or nix-shell to
# build that package.
#
# If 'returnShellEnv' is true this returns a derivation which will give you
# an environment suitable for developing the listed packages with an
# incremental tool like cabal-install.
#
# If 'withHoogle' is true (the default if a shell environment is requested)
# then 'ghcWithHoogle' is used to generate the derivation (instead of
# 'ghcWithPackages'), see the documentation there for more information.
#
# 'cabal2nixOptions' can contain extra command line arguments to pass to
# 'cabal2nix' when generating the package derivation, for example setting
# a cabal flag with '--flag=myflag'.
developPackage =
{ root
, name ? if builtins.typeOf root == "path" then builtins.baseNameOf root else ""
, source-overrides ? {}
, overrides ? self: super: {}
, modifier ? drv: drv
, returnShellEnv ? pkgs.lib.inNixShell
, withHoogle ? returnShellEnv
, cabal2nixOptions ? "" }:
let drv =
(extensible-self.extend
(pkgs.lib.composeExtensions
(self.packageSourceOverrides source-overrides)
overrides))
.callCabal2nixWithOptions name root cabal2nixOptions {};
in if returnShellEnv
then (modifier drv).envFunc {inherit withHoogle;}
else modifier drv;
ghcWithPackages = selectFrom: withPackages (selectFrom self);
# Put 'hoogle' into the derivation's PATH with a database containing all
# the package's dependencies; run 'hoogle server --local' in a shell to
# host a search engine for the dependencies.
#
# To reload the Hoogle server automatically on .cabal file changes try
# this:
# echo *.cabal | entr -r -- nix-shell --run 'hoogle server --local'
ghcWithHoogle = selectFrom:
let
packages = selectFrom self;
hoogle = callPackage ./hoogle.nix {
inherit packages;
};
in withPackages (packages ++ [ hoogle ]);
# Returns a derivation whose environment contains a GHC with only
# the dependencies of packages listed in `packages`, not the
# packages themselves. Using nix-shell on this derivation will
# give you an environment suitable for developing the listed
# packages with an incremental tool like cabal-install.
#
# In addition to the "packages" arg and "withHoogle" arg, anything that
# can be passed into stdenv.mkDerivation can be included in the input attrset
#
# # default.nix
# with import <nixpkgs> {};
# haskellPackages.extend (haskell.lib.packageSourceOverrides {
# frontend = ./frontend;
# backend = ./backend;
# common = ./common;
# })
#
# # shell.nix
# let pkgs = import <nixpkgs> {} in
# (import ./.).shellFor {
# packages = p: [p.frontend p.backend p.common];
# withHoogle = true;
# buildInputs = [ pkgs.python pkgs.cabal-install ];
# }
#
# -- cabal.project
# packages:
# frontend/
# backend/
# common/
#
# bash$ nix-shell --run "cabal new-build all"
# bash$ nix-shell --run "python"
shellFor =
{ # Packages to create this development shell for. These are usually
# your local packages.
packages
, # Whether or not to generate a Hoogle database for all the
# dependencies.
withHoogle ? false
, # Whether or not to include benchmark dependencies of your local
# packages. You should set this to true if you have benchmarks defined
# in your local packages that you want to be able to run with cabal benchmark
doBenchmark ? false
# An optional function that can modify the generic builder arguments
# for the fake package that shellFor uses to construct its environment.
#
# Example:
# let
# # elided...
# haskellPkgs = pkgs.haskell.packages.ghc884.override (hpArgs: {
# overrides = pkgs.lib.composeExtensions (hpArgs.overrides or (_: _: { })) (
# _hfinal: hprev: {
# mkDerivation = args: hprev.mkDerivation ({
# doCheck = false;
# doBenchmark = false;
# doHoogle = true;
# doHaddock = true;
# enableLibraryProfiling = false;
# enableExecutableProfiling = false;
# } // args);
# }
# );
# });
# in
# haskellPkgs.shellFor {
# packages = p: [ p.foo ];
# genericBuilderArgsModifier = args: args // { doCheck = true; doBenchmark = true };
# }
#
# This will disable tests and benchmarks for everything in "haskellPkgs"
# (which will invalidate the binary cache), and then re-enable them
# for the "shellFor" environment (ensuring that any test/benchmark
# dependencies for "foo" will be available within the nix-shell).
, genericBuilderArgsModifier ? (args: args)
, ...
} @ args:
let
# A list of the packages we want to build a development shell for.
# This is a list of Haskell package derivations.
selected = packages self;
# This is a list of attribute sets, where each attribute set
# corresponds to the build inputs of one of the packages input to shellFor.
#
# Each attribute has keys like buildDepends, executableHaskellDepends,
# testPkgconfigDepends, etc. The values for the keys of the attribute
# set are lists of dependencies.
#
# Example:
# cabalDepsForSelected
# => [
# # This may be the attribute set corresponding to the `backend`
# # package in the example above.
# { buildDepends = [ gcc ... ];
# libraryHaskellDepends = [ lens conduit ... ];
# ...
# }
# # This may be the attribute set corresponding to the `common`
# # package in the example above.
# { testHaskellDepends = [ tasty hspec ... ];
# libraryHaskellDepends = [ lens aeson ];
# benchmarkHaskellDepends = [ criterion ... ];
# ...
# }
# ...
# ]
cabalDepsForSelected = map (p: p.getCabalDeps) selected;
# A predicate that takes a derivation as input, and tests whether it is
# the same as any of the `selected` packages.
#
# Returns true if the input derivation is not in the list of `selected`
# packages.
#
# isNotSelected :: Derivation -> Bool
#
# Example:
#
# isNotSelected common [ frontend backend common ]
# => false
#
# isNotSelected lens [ frontend backend common ]
# => true
isNotSelected = input: pkgs.lib.all (p: input.outPath or null != p.outPath) selected;
# A function that takes a list of list of derivations, filters out all
# the `selected` packages from each list, and concats the results.
#
# zipperCombinedPkgs :: [[Derivation]] -> [Derivation]
#
# Example:
# zipperCombinedPkgs [ [ lens conduit ] [ aeson frontend ] ]
# => [ lens conduit aeson ]
#
# Note: The reason this isn't just the function `pkgs.lib.concat` is
# that we need to be careful to remove dependencies that are in the
# `selected` packages.
#
# For instance, in the above example, if `common` is a dependency of
# `backend`, then zipperCombinedPkgs needs to be careful to filter out
# `common`, because cabal will end up ignoring that built version,
# assuming new-style commands.
zipperCombinedPkgs = vals:
pkgs.lib.concatMap
(drvList: pkgs.lib.filter isNotSelected drvList)
vals;
# Zip `cabalDepsForSelected` into a single attribute list, combining
# the derivations in all the individual attributes.
#
# Example:
# packageInputs
# => # Assuming the value of cabalDepsForSelected is the same as
# # the example in cabalDepsForSelected:
# { buildDepends = [ gcc ... ];
# libraryHaskellDepends = [ lens conduit aeson ... ];
# testHaskellDepends = [ tasty hspec ... ];
# benchmarkHaskellDepends = [ criterion ... ];
# ...
# }
#
# See the Note in `zipperCombinedPkgs` for what gets filtered out from
# each of these dependency lists.
packageInputs =
pkgs.lib.zipAttrsWith (_name: zipperCombinedPkgs) cabalDepsForSelected;
# A attribute set to pass to `haskellPackages.mkDerivation`.
#
# The important thing to note here is that all the fields from
# packageInputs are set correctly.
genericBuilderArgs = {
pname =
if pkgs.lib.length selected == 1
then (pkgs.lib.head selected).name
else "packages";
version = "0";
license = null;
}
// packageInputs
// pkgs.lib.optionalAttrs doBenchmark {
# `doBenchmark` needs to explicitly be set here because haskellPackages.mkDerivation defaults it to `false`. If the user wants benchmark dependencies included in their development shell, it has to be explicitly enabled here.
doBenchmark = true;
};
# This is a pseudo Haskell package derivation that contains all the
# dependencies for the packages in `selected`.
#
# This is a derivation created with `haskellPackages.mkDerivation`.
#
# pkgWithCombinedDeps :: HaskellDerivation
pkgWithCombinedDeps = self.mkDerivation (genericBuilderArgsModifier genericBuilderArgs);
# The derivation returned from `envFunc` for `pkgWithCombinedDeps`.
#
# This is a derivation that can be run with `nix-shell`. It provides a
# GHC with a package database with all the dependencies of our
# `selected` packages.
#
# This is a derivation created with `stdenv.mkDerivation` (not
# `haskellPackages.mkDerivation`).
#
# pkgWithCombinedDepsDevDrv :: Derivation
pkgWithCombinedDepsDevDrv = pkgWithCombinedDeps.envFunc { inherit withHoogle; };
mkDerivationArgs = builtins.removeAttrs args [ "genericBuilderArgsModifier" "packages" "withHoogle" "doBenchmark" ];
in pkgWithCombinedDepsDevDrv.overrideAttrs (old: mkDerivationArgs // {
nativeBuildInputs = old.nativeBuildInputs ++ mkDerivationArgs.nativeBuildInputs or [];
buildInputs = old.buildInputs ++ mkDerivationArgs.buildInputs or [];
});
ghc = ghc // {
withPackages = self.ghcWithPackages;
withHoogle = self.ghcWithHoogle;
};
}