flake: add host outputs for nixpkgs-staging and nixpkgs-staging-next

flake.lock

@@ -51,6 +51,38 @@
         "type": "github"
       }
     },
+    "nixpkgs-staging-next-unpatched": {
+      "locked": {
+        "lastModified": 1702317658,
+        "narHash": "sha256-jYzBIMW18oQG+uQ9TVZwiYFHVafYIqllW+zFLROtwcE=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "f81605387c494a302c16901ac6459e877c45f913",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "staging-next",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs-staging-unpatched": {
+      "locked": {
+        "lastModified": 1702311933,
+        "narHash": "sha256-bARcUNREf0wVSYzWhcK+mKCUgzeHbiKKDbpHBH92Mdk=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "14b1b887952e70c12c6b8fc4ee9c1e22ec32faa6",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "staging",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
     "nixpkgs-unpatched": {
       "locked": {
         "lastModified": 1702272962,
@@ -70,6 +102,8 @@
     "root": {
       "inputs": {
         "mobile-nixos": "mobile-nixos",
+        "nixpkgs-staging-next-unpatched": "nixpkgs-staging-next-unpatched",
+        "nixpkgs-staging-unpatched": "nixpkgs-staging-unpatched",
         "nixpkgs-unpatched": "nixpkgs-unpatched",
         "sops-nix": "sops-nix",
         "uninsane-dot-org": "uninsane-dot-org"

flake.nix

@@ -44,8 +44,8 @@
     # <https://github.com/nixos/nixpkgs/tree/nixos-unstable>
     # nixpkgs-unpatched.url = "github:nixos/nixpkgs?ref=nixos-unstable";
     nixpkgs-unpatched.url = "github:nixos/nixpkgs?ref=master";
-    # nixpkgs-unpatched.url = "github:nixos/nixpkgs?ref=staging-next";
-    # nixpkgs-unpatched.url = "github:nixos/nixpkgs?ref=staging";
+    nixpkgs-staging-next-unpatched.url = "github:nixos/nixpkgs?ref=staging-next";
+    nixpkgs-staging-unpatched.url = "github:nixos/nixpkgs?ref=staging";
 
     mobile-nixos = {
       # <https://github.com/nixos/mobile-nixos>
@@ -74,6 +74,8 @@
   outputs = {
     self,
     nixpkgs-unpatched,
+    nixpkgs-staging-unpatched ? null,
+    nixpkgs-staging-next-unpatched ? null,
     mobile-nixos,
     sops-nix,
     uninsane-dot-org,
@@ -83,6 +85,8 @@
       inherit (builtins) attrNames elem listToAttrs map mapAttrs;
       # redefine some nixpkgs `lib` functions to avoid the infinite recursion
       # of if we tried to use patched `nixpkgs.lib` as part of the patching process.
+      mapAttrs' = f: set:
+        listToAttrs (map (attr: f attr set.${attr}) (attrNames set));
       optionalAttrs = cond: attrs: if cond then attrs else {};
       # mapAttrs but without the `name` argument
       mapAttrValues = f: mapAttrs (_: f);
@@ -90,9 +94,9 @@
       # rather than apply our nixpkgs patches as a flake input, do that here instead.
       # this (temporarily?) resolves the bad UX wherein a subflake residing in the same git
       # repo as the main flake causes the main flake to have an unstable hash.
-      nixpkgs = (import ./nixpatches/flake.nix).outputs {
-        self = nixpkgs;
-        nixpkgs = nixpkgs-unpatched;
+      patchNixpkgs = variant: nixpkgs: (import ./nixpatches/flake.nix).outputs {
+        inherit variant nixpkgs;
+        self = patchNixpkgs variant nixpkgs;
       } // {
         # provide values that nixpkgs ordinarily sources from the flake.lock file,
         # inaccessible to it here because of the import-from-derivation.
@@ -108,9 +112,10 @@
         inherit (self) shortRev;
       };
 
+      nixpkgs = patchNixpkgs "master" nixpkgs-unpatched;
       nixpkgsCompiledBy = system: nixpkgs.legacyPackages."${system}";
 
-      evalHost = { name, local, target, light ? false }: nixpkgs.lib.nixosSystem {
+      evalHost = { name, local, target, light ? false, nixpkgs ? nixpkgs }: nixpkgs.lib.nixosSystem {
         system = target;
         modules = [
           {
@@ -148,7 +153,19 @@
           moby-light  = { name = "moby";   local = "x86_64-linux"; target = "aarch64-linux"; light = true; };
           rescue      = { name = "rescue"; local = "x86_64-linux"; target = "x86_64-linux";  };
         };
-      in mapAttrValues evalHost hosts;
+        stagingHosts = mapAttrs' (h: v: {
+          name = "${h}-staging";
+          value = v // { nixpkgs = patchNixpkgs "staging" nixpkgs-staging-unpatched; };
+        }) hosts;
+        stagingNextHosts = mapAttrs' (h: v: {
+          name = "${h}-staging-next";
+          value = v // { nixpkgs = patchNixpkgs "staging-next" nixpkgs-staging-next-unpatched; };
+        }) hosts;
+      in mapAttrValues evalHost (
+        hosts //
+        (optionalAttrs (nixpkgs-staging-unpatched != null) stagingHosts) //
+        (optionalAttrs (nixpkgs-staging-next-unpatched != null) stagingNextHosts)
+      );
 
       # unofficial output
       # this produces a EFI-bootable .img file (GPT with a /boot partition and a system (/ or /nix) partition).

nixpatches/flake.nix

@@ -3,15 +3,16 @@
     # user is expected to define this from their flake via `inputs.nixpkgs.follows = ...`
     nixpkgs = {};
   };
-  outputs = { self, nixpkgs }@inputs:
+  outputs = { self, nixpkgs, variant ? "master" }@inputs:
     let
       patchedPkgsFor = system: nixpkgs.legacyPackages.${system}.applyPatches {
         name = "nixpkgs-patched-uninsane";
         version = self.lastModifiedDate;
         src = nixpkgs;
-        patches = import ./list.nix {
+        patches = builtins.filter (p: p != null) (import ./list.nix {
           inherit (nixpkgs.legacyPackages.${system}) fetchpatch2 fetchurl;
-        };
+          inherit variant;
+        });
       };
       patchedFlakeFor = system: import "${patchedPkgsFor system}/flake.nix";
       patchedFlakeOutputsFor = system:

nixpatches/list.nix

@@ -1,4 +1,4 @@
-{ fetchpatch2, fetchurl }:
+{ fetchpatch2, fetchurl, variant }:
 let
   fetchpatch' = {
     saneCommit ? null,
@@ -7,6 +7,7 @@ let
     hash ? null,
     title ? null,
     revert ? false,
+    applies ? [ "unstable" "master" "staging" "staging-next" ],
   }:
     let
       url = if prUrl != null then
@@ -17,11 +18,11 @@ let
       else
         "https://github.com/NixOS/nixpkgs/commit/${nixpkgsCommit}.patch"
       ;
-    in fetchpatch2 (
+    in if (builtins.elem variant applies) then fetchpatch2 (
       { inherit revert url; }
       // (if hash != null then { inherit hash; } else {})
       // (if title != null then { name = title; } else {})
-    );
+    ) else null;
 in [
   (fetchpatch' {
     title = "ripgrep: fix shell completions when cross compiling";
@@ -32,6 +33,7 @@ in [
     title = "python3Packages.numpy: fix cross compilation";
     prUrl = "https://github.com/NixOS/nixpkgs/pull/268587";
     hash = "sha256-GRRLXwUw2JXEV6Ov0QiVTFwoi/ACManG2Qk7D3fzS8E=";
+    applies = [ "unstable" "master" ];
   })
   # (fetchpatch' {
   #   title = "nixos/slskd: allow omitting username from yaml config";