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digga/lib/attrs.nix
bors[bot] 5a3bae7be5
Merge #220
220: Drop flattenTreeSystem and use custom function for filtering packages r=nrdxp a=Pacman99

I don't think we should flatten the system because if a user doesn't make a package a derivation in pkgs/default.nix we should trust that there is a reason for doing so. So instead this drops the flattenTreeSystem reference(and switches to flake-utils master branch) and replaces its usage with a custom function `filterPackages`. This function filter all packages that match three conditions;
 - is a derivation
 - not broken
 - system is supported

In that order as to not cause errors when trying to reference non-derivation meta attributes.

And then also just dump *all* packages into legacy packages, so everything else is still accessible. I was considering removing the packages that are already in the packages output in legacyPackages, but I don't think its necessary since nix looks to the packages output first.

Co-authored-by: Pacman99 <pachum99@gmail.com>
2021-03-27 00:10:58 +00:00

41 lines
1.3 KiB
Nix

{ lib, ... }:
rec {
# mapFilterAttrs ::
# (name -> value -> bool )
# (name -> value -> { name = any; value = any; })
# attrs
mapFilterAttrs = seive: f: attrs:
lib.filterAttrs
seive
(lib.mapAttrs' f attrs);
# Generate an attribute set by mapping a function over a list of values.
genAttrs' = values: f: lib.listToAttrs (map f values);
# Convert a list of file paths to attribute set
# that has the filenames stripped of nix extension as keys
# and imported content of the file as value.
#
pathsToImportedAttrs = paths:
let
paths' = lib.filter (lib.hasSuffix ".nix") paths;
in
genAttrs' paths' (path: {
name = lib.removeSuffix ".nix"
# Safe as long this is just used as a name
(builtins.unsafeDiscardStringContext (baseNameOf path));
value = import path;
});
concatAttrs = lib.fold (attr: sum: lib.recursiveUpdate sum attr) { };
# Filter out packages that support given system and follow flake check requirements
filterPackages = system: packages:
let
# Everything that nix flake check requires for the packages output
filter = (n: v: with v; let platforms = meta.hydraPlatforms or meta.platforms or [ ]; in
lib.isDerivation v && !meta.broken && builtins.elem system platforms);
in
lib.filterAttrs filter packages;
}