mirror of
https://github.com/NixOS/nixpkgs.git
synced 2024-11-18 19:51:17 +00:00
fcaa408d00
Allows detecting whether attributes are overridden in all-packages.nix. In a future commit we'll use this to detect empty arguments being set in all-packages.nix and complain about that.
60 lines
3 KiB
Nix
60 lines
3 KiB
Nix
# This file turns the pkgs/by-name directory (see its README.md for more info) into an overlay that adds all the defined packages.
|
|
# No validity checks are done here,
|
|
# instead this file is optimised for performance,
|
|
# and validity checks are done by CI on PRs.
|
|
|
|
# Type: Path -> Overlay
|
|
baseDirectory:
|
|
let
|
|
# Because of Nix's import-value cache, importing lib is free
|
|
lib = import ../../lib;
|
|
|
|
inherit (builtins)
|
|
readDir
|
|
;
|
|
|
|
inherit (lib.attrsets)
|
|
mapAttrs
|
|
mapAttrsToList
|
|
mergeAttrsList
|
|
;
|
|
|
|
# Package files for a single shard
|
|
# Type: String -> String -> AttrsOf Path
|
|
namesForShard = shard: type:
|
|
if type != "directory" then
|
|
# Ignore all non-directories. Technically only README.md is allowed as a file in the base directory, so we could alternatively:
|
|
# - Assume that README.md is the only file and change the condition to `shard == "README.md"` for a minor performance improvement.
|
|
# This would however cause very poor error messages if there's other files.
|
|
# - Ensure that README.md is the only file, throwing a better error message if that's not the case.
|
|
# However this would make for a poor code architecture, because one type of error would have to be duplicated in the validity checks and here.
|
|
# Additionally in either of those alternatives, we would have to duplicate the hardcoding of "README.md"
|
|
{ }
|
|
else
|
|
mapAttrs
|
|
(name: _: baseDirectory + "/${shard}/${name}/package.nix")
|
|
(readDir (baseDirectory + "/${shard}"));
|
|
|
|
# The attribute set mapping names to the package files defining them
|
|
# This is defined up here in order to allow reuse of the value (it's kind of expensive to compute)
|
|
# if the overlay has to be applied multiple times
|
|
packageFiles = mergeAttrsList (mapAttrsToList namesForShard (readDir baseDirectory));
|
|
in
|
|
# TODO: Consider optimising this using `builtins.deepSeq packageFiles`,
|
|
# which could free up the above thunks and reduce GC times.
|
|
# Currently this would be hard to measure until we have more packages
|
|
# and ideally https://github.com/NixOS/nix/pull/8895
|
|
self: super:
|
|
{
|
|
# This attribute is necessary to allow CI to ensure that all packages defined in `pkgs/by-name`
|
|
# don't have an overriding definition in `all-packages.nix` with an empty (`{ }`) second `callPackage` argument.
|
|
# It achieves that with an overlay that modifies both `callPackage` and this attribute to signal whether `callPackage` is used
|
|
# and whether it's defined by this file here or `all-packages.nix`.
|
|
# TODO: This can be removed once `pkgs/by-name` can handle custom `callPackage` arguments without `all-packages.nix` (or any other way of achieving the same result).
|
|
# Because at that point the code in ./stage.nix can be changed to not allow definitions in `all-packages.nix` to override ones from `pkgs/by-name` anymore and throw an error if that happens instead.
|
|
_internalCallByNamePackageFile = file: self.callPackage file { };
|
|
}
|
|
// mapAttrs
|
|
(name: self._internalCallByNamePackageFile)
|
|
packageFiles
|