From d22a2336c19fc1fd08e3b1f9d88629b319558cab Mon Sep 17 00:00:00 2001
From: sommerfeld <sommerfeld@sommerfeld.dev>
Date: Wed, 20 May 2026 13:56:09 +0100
Subject: feat(bootstrap): install nix + Home-Manager on Arch host (p8)

Append two steps to the root bootstrap.sh:

  5a. install nix via the Determinate Systems multi-user installer
      (same as remote-dev/nix; gives us a proper nix-daemon.service).
  5b. chsh to ~/.nix-profile/bin/zsh after appending to /etc/shells.

Add a 'just nix-switch' recipe that auto-picks the host vs vm profile
based on /etc/os-release ID, and wire it into 'just init' and
'just sync' so day-to-day reconciliation also re-applies Home-Manager.

The recipe is a no-op when nix isn't installed, so it stays safe for
pre-bootstrap states and for hosts where the user opts out.

Phase 8 of the nix-on-host migration plan.
---
 justfile | 27 +++++++++++++++++++++++----
 1 file changed, 23 insertions(+), 4 deletions(-)

(limited to 'justfile')

diff --git a/justfile b/justfile
index 8cb4dc6..fa80823 100644
--- a/justfile
+++ b/justfile
@@ -6,20 +6,39 @@ default:
 # Setup
 # ═══════════════════════════════════════════════════════════════════
 
-# First-time machine setup: regenerate chezmoi config, install git hooks, deploy dotfiles, install base packages, enable curated units
-init: _chezmoi-init _install-hooks apply (pkg-apply "base") unit-apply
+# First-time machine setup: regenerate chezmoi config, install git hooks, deploy dotfiles, install base packages, enable curated units, switch Home-Manager
+init: _chezmoi-init _install-hooks apply (pkg-apply "base") unit-apply nix-switch
 
 # ═══════════════════════════════════════════════════════════════════
 # Day-to-day
 # ═══════════════════════════════════════════════════════════════════
 
-# Reconcile everything: deploy dotfiles + /etc, top up packages, enable curated units
-sync: apply pkg-fix unit-apply
+# Reconcile everything: deploy dotfiles + /etc, top up packages, enable curated units, sync Home-Manager
+sync: apply pkg-fix unit-apply nix-switch
 
 # Deploy dotfiles AND /etc atomically (chezmoi apply; /etc handled by onchange template)
 apply:
     chezmoi apply -S . -v
 
+# Apply Home-Manager profile (host on Arch, vm on Ubuntu remote-dev). Falls
+
+# back to a no-op when nix isn't installed (pre-bootstrap state).
+nix-switch:
+    #!/bin/sh
+    set -eu
+    if ! command -v nix >/dev/null 2>&1; then
+        echo "nix not installed; skipping home-manager switch" >&2
+        exit 0
+    fi
+    profile=host
+    [ -f /etc/os-release ] && . /etc/os-release || true
+    case "${ID:-}" in
+        ubuntu|debian) profile=vm ;;
+    esac
+    nix --extra-experimental-features 'nix-command flakes' \
+        run home-manager/master -- \
+        switch --impure --flake "{{ justfile_directory() }}/nix#${profile}" -b backup
+
 # ═══════════════════════════════════════════════════════════════════
 # Updates
 # ═══════════════════════════════════════════════════════════════════
-- 
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