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nixpkgs/pkgs/stdenv/adapters.nix
2016-01-30 16:36:57 +00:00

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Nix

/* This file contains various functions that take a stdenv and return
a new stdenv with different behaviour, e.g. using a different C
compiler. */
pkgs:
rec {
# Override the compiler in stdenv for specific packages.
overrideCC = stdenv: cc: stdenv.override { allowedRequisites = null; cc = cc; };
# Add some arbitrary packages to buildInputs for specific packages.
# Used to override packages in stdenv like Make. Should not be used
# for other dependencies.
overrideInStdenv = stdenv: pkgs:
stdenv.override (prev: { allowedRequisites = null; extraBuildInputs = prev.extraBuildInputs or [] ++ pkgs; });
# Override the setup script of stdenv. Useful for testing new
# versions of the setup script without causing a rebuild of
# everything.
#
# Example:
# randomPkg = import ../bla { ...
# stdenv = overrideSetup stdenv ../stdenv/generic/setup-latest.sh;
# };
overrideSetup = stdenv: setupScript: stdenv.override { inherit setupScript; };
# Return a modified stdenv that tries to build statically linked
# binaries.
makeStaticBinaries = stdenv: stdenv //
{ mkDerivation = args: stdenv.mkDerivation (args // {
NIX_CFLAGS_LINK = "-static";
configureFlags =
toString args.configureFlags or ""
+ " --disable-shared"; # brrr...
});
isStatic = true;
};
# Return a modified stdenv that builds static libraries instead of
# shared libraries.
makeStaticLibraries = stdenv: stdenv //
{ mkDerivation = args: stdenv.mkDerivation (args // {
dontDisableStatic = true;
configureFlags =
toString args.configureFlags or ""
+ " --enable-static --disable-shared";
});
};
# Return a modified stdenv that adds a cross compiler to the
# builds.
makeStdenvCross = stdenv: cross: binutilsCross: gccCross: stdenv //
{ mkDerivation = {name ? "", buildInputs ? [], nativeBuildInputs ? [],
propagatedBuildInputs ? [], propagatedNativeBuildInputs ? [],
selfNativeBuildInput ? false, ...}@args: let
# *BuildInputs exists temporarily as another name for
# *HostInputs.
# In nixpkgs, sometimes 'null' gets in as a buildInputs element,
# and we handle that through isAttrs.
getNativeDrv = drv: drv.nativeDrv or drv;
getCrossDrv = drv: drv.crossDrv or drv;
nativeBuildInputsDrvs = map getNativeDrv nativeBuildInputs;
buildInputsDrvs = map getCrossDrv buildInputs;
buildInputsDrvsAsBuildInputs = map getNativeDrv buildInputs;
propagatedBuildInputsDrvs = map getCrossDrv propagatedBuildInputs;
propagatedNativeBuildInputsDrvs = map getNativeDrv propagatedNativeBuildInputs;
# The base stdenv already knows that nativeBuildInputs and
# buildInputs should be built with the usual gcc-wrapper
# And the same for propagatedBuildInputs.
nativeDrv = stdenv.mkDerivation args;
# Temporary expression until the cross_renaming, to handle the
# case of pkgconfig given as buildInput, but to be used as
# nativeBuildInput.
hostAsNativeDrv = drv:
builtins.unsafeDiscardStringContext drv.nativeDrv.drvPath
== builtins.unsafeDiscardStringContext drv.crossDrv.drvPath;
buildInputsNotNull = stdenv.lib.filter
(drv: builtins.isAttrs drv && drv ? nativeDrv) buildInputs;
nativeInputsFromBuildInputs = stdenv.lib.filter hostAsNativeDrv buildInputsNotNull;
# We should overwrite the input attributes in crossDrv, to overwrite
# the defaults for only-native builds in the base stdenv
crossDrv = if cross == null then nativeDrv else
stdenv.mkDerivation (args // {
name = name + "-" + cross.config;
nativeBuildInputs = nativeBuildInputsDrvs
++ nativeInputsFromBuildInputs
++ [ gccCross binutilsCross ] ++
stdenv.lib.optional selfNativeBuildInput nativeDrv;
# Cross-linking dynamic libraries, every buildInput should
# be propagated because ld needs the -rpath-link to find
# any library needed to link the program dynamically at
# loader time. ld(1) explains it.
buildInputs = [];
propagatedBuildInputs = propagatedBuildInputsDrvs ++ buildInputsDrvs;
propagatedNativeBuildInputs = propagatedNativeBuildInputsDrvs;
crossConfig = cross.config;
} // args.crossAttrs or {});
in nativeDrv // {
inherit crossDrv nativeDrv;
};
} // {
inherit cross gccCross binutilsCross;
ccCross = gccCross;
};
/* Modify a stdenv so that the specified attributes are added to
every derivation returned by its mkDerivation function.
Example:
stdenvNoOptimise =
addAttrsToDerivation
{ NIX_CFLAGS_COMPILE = "-O0"; }
stdenv;
*/
addAttrsToDerivation = extraAttrs: stdenv: stdenv //
{ mkDerivation = args: stdenv.mkDerivation (args // extraAttrs); };
/* Return a modified stdenv that builds packages with GCC's coverage
instrumentation. The coverage note files (*.gcno) are stored in
$out/.build, along with the source code of the package, to enable
programs like lcov to produce pretty-printed reports.
*/
addCoverageInstrumentation = stdenv:
overrideInStdenv stdenv [ pkgs.enableGCOVInstrumentation pkgs.keepBuildTree ];
/* Replace the meta.maintainers field of a derivation. This is useful
when you want to fork to update some packages without disturbing other
developers.
e.g.: in all-packages.nix:
# remove all maintainers.
defaultStdenv = replaceMaintainersField allStdenvs.stdenv pkgs [];
*/
replaceMaintainersField = stdenv: pkgs: maintainers: stdenv //
{ mkDerivation = args:
stdenv.lib.recursiveUpdate
(stdenv.mkDerivation args)
{ meta.maintainers = maintainers; };
};
/* Use the trace output to report all processed derivations with their
license name.
*/
traceDrvLicenses = stdenv: stdenv //
{ mkDerivation = args:
let
pkg = stdenv.mkDerivation args;
printDrvPath = val: let
drvPath = builtins.unsafeDiscardStringContext pkg.drvPath;
license = pkg.meta.license or null;
in
builtins.trace "@:drv:${toString drvPath}:${builtins.toString license}:@" val;
in pkg // {
outPath = printDrvPath pkg.outPath;
drvPath = printDrvPath pkg.drvPath;
};
};
/* Abort if the license predicate is not verified for a derivation
declared with mkDerivation.
One possible predicate to avoid all non-free packages can be achieved
with the following function:
isFree = license: with builtins;
if isNull license then true
else if isList license then lib.all isFree license
else license != "non-free" && license != "unfree";
This adapter can be defined on the defaultStdenv definition. You can
use it by patching the all-packages.nix file or by using the override
feature of ~/.nixpkgs/config.nix .
*/
validateLicenses = licensePred: stdenv: stdenv //
{ mkDerivation = args:
let
pkg = stdenv.mkDerivation args;
drv = builtins.unsafeDiscardStringContext pkg.drvPath;
license =
pkg.meta.license or
# Fixed-output derivations such as source tarballs usually
# don't have licensing information, but that's OK.
(pkg.outputHash or
(builtins.trace
"warning: ${drv} lacks licensing information" null));
validate = arg:
if licensePred license then arg
else abort ''
while building ${drv}:
license `${builtins.toString license}' does not pass the predicate.
'';
in pkg // {
outPath = validate pkg.outPath;
drvPath = validate pkg.drvPath;
};
};
/* Modify a stdenv so that it produces debug builds; that is,
binaries have debug info, and compiler optimisations are
disabled. */
keepDebugInfo = stdenv: stdenv //
{ mkDerivation = args: stdenv.mkDerivation (args // {
dontStrip = true;
NIX_CFLAGS_COMPILE = toString (args.NIX_CFLAGS_COMPILE or "") + " -ggdb -Og";
});
};
/* Modify a stdenv so that it uses the Gold linker. */
useGoldLinker = stdenv: stdenv //
{ mkDerivation = args: stdenv.mkDerivation (args // {
NIX_CFLAGS_LINK = toString (args.NIX_CFLAGS_LINK or "") + " -fuse-ld=gold";
});
};
useHardenFlags = stdenv: stdenv //
{ mkDerivation = args: stdenv.mkDerivation (args // {
NIX_CFLAGS_COMPILE = toString (args.NIX_CFLAGS_COMPILE or "")
+ stdenv.lib.optionalString (args.hardening_all or true) (
stdenv.lib.optionalString (args.hardening_fortify or true) " -O2 -D_FORTIFY_SOURCE=2"
+ stdenv.lib.optionalString (args.hardening_stackprotector or true) " -fstack-protector-all"
+ stdenv.lib.optionalString (args.hardening_pie or false) " -fPIE -pie"
+ stdenv.lib.optionalString (args.hardening_pic or true) " -fPIC"
+ stdenv.lib.optionalString (args.hardening_relro or true) " -Wl,-z,relro"
+ stdenv.lib.optionalString (args.hardening_bindnow or true) " -Wl,-z,now"
+ stdenv.lib.optionalString (args.hardening_strictoverflow or true) " -fno-strict-overflow"
+ stdenv.lib.optionalString (args.hardening_format or true) " -Wformat -Wformat-security -Werror=format-security"
);
NIX_LDFLAGS = toString (args.NIX_LDFLAGS or "")
+ stdenv.lib.optionalString (args.hardening_all or true) (
stdenv.lib.optionalString (args.hardening_relro or true) " -z relro"
+ stdenv.lib.optionalString (args.hardening_bindnow or true) " -z now"
);
});
};
dropCxx = drv: drv.override {
stdenv = if pkgs.stdenv.isDarwin
then pkgs.allStdenvs.stdenvDarwinNaked
else pkgs.stdenv;
};
}