update-scripts/version-info: get channel status for supported versions

Fetch channel info from NixOS/infra, the canonical source of truth.

update-scripts/version-info/default.nix

@@ -2,19 +2,41 @@
   lib,
   callPackage,
   writeShellApplication,
+  stdenv,
 }:
 let
   mainInfo = callPackage ./main.nix { };
+  channelsURL = "https://raw.githubusercontent.com/NixOS/infra/refs/heads/main/channels.nix";
 in
 writeShellApplication {
   name = "version-info";
+
+  runtimeEnv = {
+    NIX_CONFIG = ''
+      experimental-features = nix-command flakes pipe-operators
+    '';
+  };
+
   text = ''
+    # Download channel info from NixOS/infra
+    curl ${channelsURL} | nix eval --file - --json > channels.json
+
+    # Use channels.nix to build channels.toml
+    nix build --impure \
+      --inputs-from ${toString ../..} \
+      --file ${./supported-versions.nix} \
+      --argstr system ${stdenv.hostPlatform.system} \
+      --arg-from-file channelsJSON channels.json \
+      --out-link channels.toml
+
     (
       echo "# DO NOT MODIFY!"
       echo "# This file was generated by ${
         lib.strings.removePrefix (toString ../.. + "/") (toString ./default.nix)
       }"
       cat ${mainInfo}
+      echo
+      cat channels.toml
     ) > version-info.toml
   '';
 }

update-scripts/version-info/supported-versions.nix

@@ -0,0 +1,62 @@
+{
+  system ? builtins.currentSystem,
+  pkgs ? import <nixpkgs> { inherit system; },
+  lib ? import <nixpkgs/lib>,
+  channelsJSON ? throw "Neither `channels` or `channelsJSON` provided",
+  channels ? builtins.fromJSON channelsJSON,
+}:
+let
+  # Pick out supported stable channels
+  supported = [
+    "beta"
+    "stable"
+    "deprecated"
+  ];
+
+  stable_versions =
+    channels.channels
+    |> builtins.mapAttrs (channel: entry: entry // { inherit channel; })
+    |> builtins.attrValues
+    |> builtins.filter (entry: entry.variant or null == "primary")
+    |> builtins.filter (entry: builtins.elem entry.status supported)
+    |> builtins.map (entry: {
+      name = entry.channel |> builtins.match "nixos-(.+)" |> builtins.head;
+      value = {
+        inherit (entry) channel status;
+        # Currently, Nixvim stable branches match NixOS channel names
+        branch = entry.channel;
+      };
+    })
+    |> builtins.listToAttrs;
+
+  newest_stable =
+    stable_versions |> builtins.attrNames |> builtins.sort (a: b: a > b) |> builtins.head;
+
+  bumpYear = y: toString (lib.toIntBase10 y + 1);
+  bumpMonth =
+    m:
+    assert m == "05" || m == "11";
+    if m == "05" then "11" else "05";
+
+  unstable =
+    newest_stable
+    |> builtins.match "(.+)[.](.+)"
+    |> (v: {
+      y = builtins.elemAt v 0;
+      m = builtins.elemAt v 1;
+    })
+    |> (v: {
+      y = if v.m == "11" then bumpYear v.y else v.y;
+      m = bumpMonth v.m;
+    })
+    |> (v: "${v.y}.${v.m}");
+in
+pkgs.writers.writeTOML "channels.toml" {
+  versions = stable_versions // {
+    ${unstable} = {
+      branch = "main";
+      channel = "nixpkgs-unstable";
+      status = "rolling";
+    };
+  };
+}

version-info.toml

@@ -3,3 +3,18 @@
 nixpkgs_rev = "3d1f29646e4b57ed468d60f9d286cde23a8d1707"
 release = "25.11"
 unstable = true
+
+[versions."24.11"]
+branch = "nixos-24.11"
+channel = "nixos-24.11"
+status = "deprecated"
+
+[versions."25.05"]
+branch = "nixos-25.05"
+channel = "nixos-25.05"
+status = "stable"
+
+[versions."25.11"]
+branch = "main"
+channel = "nixpkgs-unstable"
+status = "rolling"