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nixpkgs/pkgs/top-level/release-lib.nix
Eelco Dolstra a2cbc77e4f Only show/build a package on the platforms listed in meta.platforms
The function ‘mkDerivation’ now checks whether the current platform
type is included in a package's meta.platform field.  If not, it
throws an exception:

  $ nix-build -A linux --argstr system x86_64-darwin
  error: user-thrown exception: the package ‘linux-3.10.15’ is not supported on ‘x86_64-darwin’

These packages also no longer show up in ‘nix-env -qa’ output.  This
means, for instance, that the number of packages shown on
x86_64-freebsd has dropped from 9268 to 4764.

Since meta.platforms was also used to prevent Hydra from building some
packages, there now is a new attribute meta.hydraPlatforms listing the
platforms on which Hydra should build the package (which defaults to
meta.platforms).
2013-11-05 00:06:10 +01:00

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{ supportedSystems }:
rec {
# Ensure that we don't build packages marked as unfree.
allPackages = args: import ./all-packages.nix (args // {
config.allowUnfree = false;
});
pkgs = allPackages { system = "x86_64-linux"; };
/* !!! Hack: poor man's memoisation function. Necessary to prevent
Nixpkgs from being evaluated again and again for every
job/platform pair. */
pkgsFor = system:
if system == "x86_64-linux" then pkgs_x86_64_linux
else if system == "i686-linux" then pkgs_i686_linux
else if system == "x86_64-darwin" then pkgs_x86_64_darwin
else if system == "x86_64-freebsd" then pkgs_x86_64_freebsd
else if system == "i686-freebsd" then pkgs_i686_freebsd
else if system == "i686-cygwin" then pkgs_i686_cygwin
else abort "unsupported system type: ${system}";
pkgs_x86_64_linux = allPackages { system = "x86_64-linux"; };
pkgs_i686_linux = allPackages { system = "i686-linux"; };
pkgs_x86_64_darwin = allPackages { system = "x86_64-darwin"; };
pkgs_x86_64_freebsd = allPackages { system = "x86_64-freebsd"; };
pkgs_i686_freebsd = allPackages { system = "i686-freebsd"; };
pkgs_i686_cygwin = allPackages { system = "i686-cygwin"; };
/* The working or failing mails for cross builds will be sent only to
the following maintainers, as most package maintainers will not be
interested in the result of cross building a package. */
crossMaintainers = with pkgs.lib.maintainers; [ viric ];
/* Set the Hydra scheduling priority for a job. The default
priority (10) should be used for most jobs. A different priority
should only be used for a few particularly interesting jobs (in
terms of giving feedback to developers), such as stdenv. */
prio = level: job: toJob job // { schedulingPriority = level; };
toJob = x: if builtins.isAttrs x then x else
{ type = "job"; systems = x; schedulingPriority = 10; };
/* Build a package on the given set of platforms. The function `f'
is called for each supported platform with Nixpkgs for that
platform as an argument . We return an attribute set containing
a derivation for each supported platform, i.e. { x86_64-linux =
f pkgs_x86_64_linux; i686-linux = f pkgs_i686_linux; ... }. */
testOn = systems: f: pkgs.lib.genAttrs
(pkgs.lib.filter (x: pkgs.lib.elem x supportedSystems) systems)
(system: f (pkgsFor system));
/* Similar to the testOn function, but with an additional
'crossSystem' parameter for allPackages, defining the target
platform for cross builds. */
testOnCross = crossSystem: systems: f: {system ? builtins.currentSystem}:
if pkgs.lib.elem system systems
then f (allPackages { inherit system crossSystem; })
else {};
/* Map an attribute of the form `foo = [platforms...]' to `testOn
[platforms...] (pkgs: pkgs.foo)'. */
mapTestOn = pkgs.lib.mapAttrsRecursiveCond
(as: !(as ? type && as.type == "job"))
(path: value:
let
job = toJob value;
getPkg = pkgs:
pkgs.lib.addMetaAttrs { schedulingPriority = toString job.schedulingPriority; }
(pkgs.lib.getAttrFromPath path pkgs);
in testOn job.systems getPkg);
/* Similar to the testOn function, but with an additional 'crossSystem'
* parameter for allPackages, defining the target platform for cross builds,
* and triggering the build of the host derivation (cross built - crossDrv). */
mapTestOnCross = crossSystem: pkgs.lib.mapAttrsRecursiveCond
(as: !(as ? type && as.type == "job"))
(path: value:
let
job = toJob value;
getPkg = pkgs: (pkgs.lib.addMetaAttrs {
schedulingPriority = toString job.schedulingPriority;
maintainers = crossMaintainers;
}
(pkgs.lib.getAttrFromPath path pkgs));
in testOnCross crossSystem job.systems getPkg);
/* Find all packages that have a meta.platforms field listing the
supported platforms. */
packagesWithMetaPlatform = attrSet:
let pairs = pkgs.lib.concatMap
(x:
let pair = builtins.tryEval
(let
attrVal = (builtins.getAttr x attrSet);
in
{ val = processPackage attrVal;
attrVal = attrVal;
attrValIsAttrs = builtins.isAttrs attrVal;
});
success = (builtins.tryEval pair.value.attrVal).success;
in
pkgs.lib.optional (success && pair.value.attrValIsAttrs && pair.value.val != [])
{ name = x; value = pair.value.val; })
(builtins.attrNames attrSet);
in
builtins.listToAttrs pairs;
# May fail as much as it wishes, we will catch the error.
processPackage = attrSet:
if attrSet.recurseForDerivations or false then
packagesWithMetaPlatform attrSet
else if attrSet.recurseForRelease or false then
packagesWithMetaPlatform attrSet
else
attrSet.meta.hydraPlatforms or (attrSet.meta.platforms or []);
/* Common platform groups on which to test packages. */
inherit (pkgs.lib.platforms) unix linux darwin cygwin allBut all mesaPlatforms;
/* Platform groups for specific kinds of applications. */
x11Supported = linux;
gtkSupported = linux;
ghcSupported = linux;
}