From ebad39adab212ab4e26f9a98befa0048c7eea710 Mon Sep 17 00:00:00 2001
From: sommerfeld <sommerfeld@sommerfeld.dev>
Date: Wed, 13 May 2026 13:43:24 +0100
Subject: feat(nix): hybrid setup with flakes + direnv for per-project dev
 shells
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Install Nix (multi-user daemon) on Arch and wire up direnv so any project
can declare its toolchain in a flake.nix and get a hermetic dev shell on
cd. No NixOS, no home-manager, no migration off paru/chezmoi — just one
new package manager scoped to project dev shells.

- meta/nix.txt: nix from extra repo
- meta/dev.txt: direnv (general-purpose, not nix-specific)
- systemd-units/system/nix.txt: nix-daemon.socket (socket-activated)
- etc/nix/nix.conf: enable flakes + nix-command, trusted-users=@wheel,
  auto-optimise-store, keep-outputs/derivations so direnv envs survive GC
- dot_config/direnv/direnvrc: load nix-direnv 3.1.1 via source_url with
  pinned sha256 (not packaged for Arch; refusing -git AUR)
- dot_config/nix/templates/{flake.nix,dev/}: flake template usable via
  'nix flake init -t ~/.config/nix/templates'
- dot_config/zsh/dot_zshrc: 'eval "$(direnv hook zsh)"'
---
 meta/dev.txt |  1 +
 meta/nix.txt | 16 ++++++++++++++++
 2 files changed, 17 insertions(+)
 create mode 100644 meta/nix.txt

(limited to 'meta')

diff --git a/meta/dev.txt b/meta/dev.txt
index bca1348..5f26ad7 100644
--- a/meta/dev.txt
+++ b/meta/dev.txt
@@ -1,6 +1,7 @@
 android-tools
 curl
 difftastic
+direnv
 git-absorb
 git-delta
 github-cli
diff --git a/meta/nix.txt b/meta/nix.txt
new file mode 100644
index 0000000..e5c4bb4
--- /dev/null
+++ b/meta/nix.txt
@@ -0,0 +1,16 @@
+# Nix package manager (multi-user daemon mode).
+#
+# Used purely for hermetic per-project dev shells via `nix develop` +
+# direnv `use flake`. Not a replacement for paru/pacman, not home-manager,
+# not NixOS — just a sandboxed second package manager that gives every
+# project a reproducible toolchain pinned in its own flake.lock.
+#
+# Pairs with:
+#   - systemd-units/system/nix.txt  (enables nix-daemon.socket)
+#   - etc/nix/nix.conf              (flakes, trusted-users=@wheel, GC roots)
+#   - dot_config/direnv/direnvrc    (loads nix-direnv; pinned via source_url)
+#   - dot_config/nix/templates/     (flake templates: nix flake init -t ~/.config/nix/templates)
+#
+# nix-direnv itself is not packaged for Arch — it's loaded at runtime via
+# direnv's source_url with a content hash, so no extra package needed.
+nix
-- 
cgit v1.3.1