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# This file imports the pinned nixpkgs sets and applies relevant
# modifications, such as our overlays.
#
# The actual source pinning happens via niv in //third_party/sources
#
# Note that the attribute exposed by this (third_party.nixpkgs) is
# "special" in that the fixpoint used as readTree's config parameter
# in //default.nix passes this attribute as the `pkgs` argument to all
# readTree derivations.
{ depot ? { }
, externalArgs ? { }
, depotOverlays ? true
, localSystem ? externalArgs.localSystem or builtins.currentSystem
, crossSystem ? externalArgs.crossSystem or localSystem
# additional overlays to be applied.
# Useful when calling this file in a view exported from depot.
, additionalOverlays ? [ ]
, ...
}:
let
# Arguments passed to both the stable nixpkgs and the main, unstable one.
# Includes everything but overlays which are only passed to unstable nixpkgs.
commonNixpkgsArgs = {
# allow users to inject their config into builds (e.g. to test CA derivations)
config =
(if externalArgs ? nixpkgsConfig then externalArgs.nixpkgsConfig else { })
// {
allowUnfree = true;
allowUnfreeRedistributable = true;
allowBroken = true;
# Forbids our meta.ci attribute
# https://github.com/NixOS/nixpkgs/pull/191171#issuecomment-1260650771
checkMeta = false;
};
inherit localSystem crossSystem;
};
# import the nixos-unstable package set, or optionally use the
# source (e.g. a path) specified by the `nixpkgsBisectPath`
# argument. This is intended for use-cases where the depot is
# bisected against nixpkgs to find the root cause of an issue in a
# channel bump.
nixpkgsSrc = externalArgs.nixpkgsBisectPath or depot.third_party.sources.nixpkgs;
# Stable package set is imported, but not exposed, to overlay
# required packages into the unstable set.
stableNixpkgs = import depot.third_party.sources.nixpkgs-stable commonNixpkgsArgs;
# Overlay for packages that should come from the stable channel
# instead (e.g. because something is broken in unstable).
# Use `stableNixpkgs` from above.
stableOverlay = _unstableSelf: unstableSuper: {
# newer trunk fails somewhere within reqwest, trying to read a mystery file
trunk = stableNixpkgs.trunk;
# the big lis package change breaks everything in //3p/lisp, undo it for now.
lispPackages = stableNixpkgs.lispPackages;
# mypaint is broken on stable (2024-09-05)
mypaint = stableNixpkgs.mypaint;
};
# Overlay to expose the nixpkgs commits we are using to other Nix code.
commitsOverlay = _: _: {
nixpkgsCommits = {
unstable = depot.third_party.sources.nixpkgs.rev;
stable = depot.third_party.sources.nixpkgs-stable.rev;
};
};
in
import nixpkgsSrc (commonNixpkgsArgs // {
overlays = [
commitsOverlay
stableOverlay
] ++ (if depotOverlays then [
depot.third_party.overlays.haskell
depot.third_party.overlays.tvl
depot.third_party.overlays.ecl-static
depot.third_party.overlays.dhall
(import depot.third_party.sources.rust-overlay)
] else [ ] ++ additionalOverlays);
})
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