[Backport release-25.11] {ci/eval,release}: migrate supported systems to top-level

ci/eval/README.md

@@ -10,14 +10,14 @@ nix-build ci -A eval.baseline
 
 The two most important arguments are:
 - `--arg evalSystems`: The set of systems for which `nixpkgs` should be evaluated.
-  Defaults to the four official platforms (`x86_64-linux`, `aarch64-linux`, `x86_64-darwin` and `aarch64-darwin`).
+  Defaults to the [supported systems](../../pkgs/top-level/release-supported-systems.json) for the branch.
   Example: `--arg evalSystems '["x86_64-linux" "aarch64-darwin"]'`
 - `--arg quickTest`: Enables testing a single chunk of the current system only for quick iteration.
   Example: `--arg quickTest true`
 
 The following arguments can be used to fine-tune performance:
 - `--max-jobs`: The maximum number of derivations to run at the same time.
-  Only each [supported system](../supportedSystems.json) gets a separate derivation, so it doesn't make sense to set this higher than that number.
+  Only each supported system gets a separate derivation, so it doesn't make sense to set this higher than that number.
 - `--cores`: The number of cores to use for each job.
   Recommended to set this to the amount of cores on your system divided by `--max-jobs`.
 - `--arg chunkSize`: The number of attributes that are evaluated simultaneously on a single core.

ci/eval/default.nix

@@ -38,7 +38,6 @@ let
       fileset = unions (
         map (lib.path.append ../..) [
           ".version"
-          "ci/supportedSystems.json"
           "ci/eval/attrpaths.nix"
           "ci/eval/chunk.nix"
           "ci/eval/outpaths.nix"
@@ -53,7 +52,9 @@ let
       );
     };
 
-  supportedSystems = builtins.fromJSON (builtins.readFile ../supportedSystems.json);
+  supportedSystems = builtins.fromJSON (
+    builtins.readFile ../../pkgs/top-level/release-supported-systems.json
+  );
 
   attrpathsSuperset =
     {

ci/eval/outpaths.nix

@@ -10,7 +10,9 @@
   attrNamesOnly ? false,
 
   # Set this to `null` to build for builtins.currentSystem only
-  systems ? builtins.fromJSON (builtins.readFile ../supportedSystems.json),
+  systems ? builtins.fromJSON (
+    builtins.readFile (path + "/pkgs/top-level/release-supported-systems.json")
+  ),
 
   # Customize the config used to evaluate nixpkgs
   extraNixpkgsConfig ? { },

pkgs/top-level/release-haskell.nix

@@ -10,7 +10,7 @@
   $ hydra-eval-jobs -I . pkgs/top-level/release-haskell.nix
 */
 {
-  supportedSystems ? builtins.fromJSON (builtins.readFile ../../ci/supportedSystems.json),
+  supportedSystems ? builtins.fromJSON (builtins.readFile ./release-supported-systems.json),
 }:
 
 let

pkgs/top-level/release-staging.nix

@@ -12,12 +12,7 @@
     revision = "0000000000000000000000000000000000000000";
   },
   # The platform doubles for which we build Nixpkgs.
-  supportedSystems ? [
-    "x86_64-linux"
-    "x86_64-darwin"
-    "aarch64-linux"
-    "aarch64-darwin"
-  ],
+  supportedSystems ? builtins.fromJSON (builtins.readFile ./release-supported-systems.json),
   # Attributes passed to nixpkgs. Don't build packages marked as unfree.
   nixpkgsArgs ? {
     config = {

pkgs/top-level/release-supported-systems.json

@@ -0,0 +1,6 @@
+[
+  "aarch64-linux",
+  "aarch64-darwin",
+  "x86_64-linux",
+  "x86_64-darwin"
+]

pkgs/top-level/release.nix

@@ -19,7 +19,7 @@
   system ? builtins.currentSystem,
   officialRelease ? false,
   # The platform doubles for which we build Nixpkgs.
-  supportedSystems ? builtins.fromJSON (builtins.readFile ../../ci/supportedSystems.json),
+  supportedSystems ? builtins.fromJSON (builtins.readFile ./release-supported-systems.json),
   # The platform triples for which we build bootstrap tools.
   bootstrapConfigs ? [
     "arm64-apple-darwin"