feat(nixpkgs): pin nixos-26.05 and add an unstable overlay #17

bram.buijs · 2026-06-18T12:08:11Z

bram.buijs commented

2026-06-18 12:08:11 +00:00

Closes #11.

Pin nixpkgs to nixos-26.05 (it tracked nixos-unstable, which drifted between
builds) and add a separate nixpkgs-unstable input exposed through an overlay, so
a single package can be cherry-picked from unstable when a newer version is needed:

environment.systemPackages = [ pkgs.unstable.<name> ];

A reproducible base, with a controlled escape for individual packages instead of
moving the whole channel. Recorded as ADR-0004.

Proof to follow.

Question: keep the existing nixpkgs-stable (25.11) input alongside this, or fold
it out now that the base is a pinned 26.05?

Closes #11. Pin `nixpkgs` to `nixos-26.05` (it tracked `nixos-unstable`, which drifted between builds) and add a separate `nixpkgs-unstable` input exposed through an overlay, so a single package can be cherry-picked from unstable when a newer version is needed: environment.systemPackages = [ pkgs.unstable.<name> ]; A reproducible base, with a controlled escape for individual packages instead of moving the whole channel. Recorded as ADR-0004. Proof to follow. Question: keep the existing `nixpkgs-stable` (25.11) input alongside this, or fold it out now that the base is a pinned 26.05?

bram.buijs added 2 commits

2026-06-18 12:08:11 +00:00

chore: pin nixpkgs to nixos-26.05 f853719562

Was nixos-unstable with a nixos-25.11 fallback that is nearly end of life. 26.05 is the current stable release; evaluates green across the config.

feat(nixpkgs): add an unstable overlay for cherry-picking newer packages 7bbdeffe94

With nixpkgs pinned to the stable channel, expose nixos-unstable through an
overlay as pkgs.unstable so a single package can be pulled from unstable when a
newer version is needed, without moving the whole base off stable. Mirrors the
existing pkgs.stable overlay.

Ref: #11

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

rutger.putter commented

2026-06-18 12:56:00 +00:00

Just remove 25.11, end of support is close or already passed.

rutger.putter reviewed

2026-06-18 12:56:23 +00:00

flake.nix Outdated

					
				@ -2,3 +2,3 @@

				  inputs = {

				    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";

				    nixpkgs.url = "github:nixos/nixpkgs/nixos-26.05";

				    nixpkgs-stable.url = "github:nixos/nixpkgs/nixos-25.11";

Let's remove 25.11.

bram.buijs marked this conversation as resolved

bram.buijs force-pushed feat/nixpkgs-unstable-overlay from 7bbdeffe94 to 7201036b3b

2026-06-18 13:24:42 +00:00

Compare

bram.buijs added 1 commit

2026-06-18 13:27:41 +00:00

chore(nixpkgs): drop EOL nixos-25.11 stable input b5c81dff73

End of support for 25.11 is near/passed, so the stable overlay it backed is
removed. Cherry-picking newer packages still works via the unstable overlay.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

bram.buijs commented

2026-06-18 19:42:36 +00:00

@rutger.putter removed 25.11. Stable on t495s

rutger.putter approved these changes

2026-06-22 08:42:05 +00:00

rutger.putter left a comment

Approved

rutger.putter merged commit 92a3061ebe into main

2026-06-22 08:42:33 +00:00

rutger.putter added the

Kind/Enhancement

label