109 lines
3.5 KiB
Nix
109 lines
3.5 KiB
Nix
# This file sets up the top-level package set by traversing the package tree
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# (see read-tree.nix for details) and constructing a matching attribute set
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# tree.
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#
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# This makes packages accessible via the Nixery instance that is configured to
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# use this repository as its nixpkgs source.
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{ ... }@args:
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with builtins;
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let
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# This definition of fix is identical to <nixpkgs>.lib.fix, but the global
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# package set is not available here.
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fix = f: let x = f x; in x;
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# Global configuration that all packages are called with.
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config = depot: {
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inherit depot;
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# Expose lib & ciBuilds attributes to packages.
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inherit (depot) ciBuilds lib;
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# Pass third_party as 'pkgs' (for compatibility with external
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# imports for certain subdirectories)
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pkgs = depot.third_party;
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};
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readTree' = import ./nix/readTree {};
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localPkgs = readTree: {
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fun = readTree ./fun;
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lisp = readTree ./lisp;
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net = readTree ./net;
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nix = readTree ./nix;
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ops = readTree ./ops;
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third_party = readTree ./third_party;
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tools = readTree ./tools;
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users = readTree ./users;
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web = readTree ./web;
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};
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# To determine build targets, we walk through the depot tree and
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# fetch attributes that were imported by readTree and are buildable.
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#
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# Any build target that contains `meta.ci = false` will be skipped.
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# Is this tree node eligible for build inclusion?
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eligible = node: (node ? outPath) && (node.meta.ci or true);
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# Walk the tree starting with 'node', recursively extending the list
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# of build targets with anything that looks buildable.
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#
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# Any tree node can specify logical targets by exporting a
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# 'meta.targets' attribute containing a list of keys in itself. This
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# enables target specifications that do not exist on disk directly.
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gather = node:
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if node ? __readTree then
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# Include the node itself if it is eligible.
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(if eligible node then [ node ] else [])
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# Include eligible children of the node
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++ concatMap gather (attrValues node)
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# Include specified sub-targets of the node
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++ filter eligible (map
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(k: (node."${k}" or {}) // {
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# Keep the same tree location, but explicitly mark this
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# node as a subtarget.
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__readTree = node.__readTree;
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__subtarget = k;
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})
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(node.meta.targets or []))
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else [];
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in fix(self: {
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config = config self;
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# Elevate 'lib' from nixpkgs
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lib = import (self.third_party.nixpkgsSrc + "/lib");
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# Expose readTree for downstream repo consumers.
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readTree = {
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__functor = x: (readTree' x.config);
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config = self.config;
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};
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# Make the path to the depot available for things that might need it
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# (e.g. NixOS module inclusions)
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depotPath = ./.;
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# List of all buildable targets, for CI purposes.
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#
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# Note: To prevent infinite recursion, this *must* be a nested
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# attribute set (which does not have a __readTree attribute).
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ci.targets = gather (self // {
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# remove the pipelines themselves from the set over which to
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# generate pipelines because that also leads to infinite
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# recursion.
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ops = self.ops // { pipelines = null; };
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});
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}
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# Add local packages as structured by readTree
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// (localPkgs (readTree' self.config))
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# Load overrides into the top-level.
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#
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# This can be used to move things from third_party into the top-level, too (such
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# as `lib`).
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// (readTree' { depot = self; pkgs = self.third_party; }) ./overrides
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)
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