Merge branch 'nixos-unstable' of https://github.com/NixOS/nixpkgs

Conflicts:
	nixpkgs/nixos/modules/config/console.nix
	nixpkgs/nixos/modules/services/mail/mailman.nix
	nixpkgs/nixos/modules/services/mail/public-inbox.nix
	nixpkgs/nixos/modules/services/mail/rss2email.nix
	nixpkgs/nixos/modules/services/networking/ssh/sshd.nix
	nixpkgs/pkgs/applications/networking/instant-messengers/dino/default.nix
	nixpkgs/pkgs/applications/networking/irc/weechat/default.nix
	nixpkgs/pkgs/applications/window-managers/sway/default.nix
	nixpkgs/pkgs/build-support/go/module.nix
	nixpkgs/pkgs/build-support/rust/build-rust-package/default.nix
	nixpkgs/pkgs/development/interpreters/python/default.nix
	nixpkgs/pkgs/development/node-packages/overrides.nix
	nixpkgs/pkgs/development/tools/b4/default.nix
	nixpkgs/pkgs/servers/dict/dictd-db.nix
	nixpkgs/pkgs/servers/mail/public-inbox/default.nix
	nixpkgs/pkgs/tools/security/pinentry/default.nix
	nixpkgs/pkgs/tools/text/unoconv/default.nix
	nixpkgs/pkgs/top-level/all-packages.nix

1 files changed, 24 insertions, 3 deletions

diff --git a/nixpkgs/flake.nix b/nixpkgs/flake.nix
index 67ecfc6eb084..fa00bffcdf92 100644
--- a/nixpkgs/flake.nix
+++ b/nixpkgs/flake.nix
@@ -11,8 +11,7 @@
 
       lib = import ./lib;
 
-      forAllSystems = f: lib.genAttrs lib.systems.flakeExposed (system: f system);
-
+      forAllSystems = lib.genAttrs lib.systems.flakeExposed;
     in
     {
       lib = lib.extend (final: prev: {
@@ -45,10 +44,32 @@
         }).nixos.manual.x86_64-linux;
       };
 
+      # The "legacy" in `legacyPackages` doesn't imply that the packages exposed
+      # through this attribute are "legacy" packages. Instead, `legacyPackages`
+      # is used here as a substitute attribute name for `packages`. The problem
+      # with `packages` is that it makes operations like `nix flake show
+      # nixpkgs` unusably slow due to the sheer number of packages the Nix CLI
+      # needs to evaluate. But when the Nix CLI sees a `legacyPackages`
+      # attribute it displays `omitted` instead of evaluating all packages,
+      # which keeps `nix flake show` on Nixpkgs reasonably fast, though less
+      # information rich.
       legacyPackages = forAllSystems (system: import ./. { inherit system; });
 
       nixosModules = {
-        notDetected = import ./nixos/modules/installer/scan/not-detected.nix;
+        notDetected = ./nixos/modules/installer/scan/not-detected.nix;
+
+        /*
+          Make the `nixpkgs.*` configuration read-only. Guarantees that `pkgs`
+          is the way you initialize it.
+
+          Example:
+
+              {
+                imports = [ nixpkgs.nixosModules.readOnlyPkgs ];
+                nixpkgs.pkgs = nixpkgs.legacyPackages.x86_64-linux;
+              }
+        */
+        readOnlyPkgs = ./nixos/modules/misc/nixpkgs/read-only.nix;
       };
     };
 }