Minor build improvements

Not sure if the features come from the new nixos-rebuild but good this
simplifies things.

flake.lock

@@ -784,15 +784,15 @@
     },
     "zelbarnixpkgs": {
       "locked": {
-        "lastModified": 1748415083,
-        "narHash": "sha256-jmIRxOA7kj1CFNiP6S6pg6e6XeQi3whBVvWsATpEiC4=",
-        "owner": "GeoffreyFrogeye",
+        "lastModified": 1743964214,
+        "narHash": "sha256-tPYh5TeRDOV9qMMr6VrgAOa5ZScqc4bohEDIU2grCnc=",
+        "owner": "wlcx",
         "repo": "nixpkgs",
-        "rev": "bc0e8ee7d08241e8fbcb5e13a7abb445329e5644",
+        "rev": "53524ff74074e3670c9a34729aa343dd461bfdb4",
         "type": "github"
       },
       "original": {
-        "owner": "GeoffreyFrogeye",
+        "owner": "wlcx",
         "ref": "zelbar",
         "repo": "nixpkgs",
         "type": "github"

hm/rebuild/default.nix

@@ -5,6 +5,9 @@
     (pkgs.writeShellApplication {
       name = "rb";
       text = ''
+        info() {
+            echo -e '\033[1;34m'"$*"'\033[0m'
+        }
         verb="switch"
         if [ "$#" -ge 1 ]
         then
@@ -14,7 +17,9 @@
         nixos_flake="$(readlink -f /etc/nixos)"
         if [ -f "$nixos_flake/flake.nix" ]
         then
+          info "Updating local flakes"
           update-local-flakes "$nixos_flake"
+          info "Starting script"
           nix run "$nixos_flake#nixosRebuild" -- "$verb" "$@"
         fi
         # TODO Fix nix-on-droid and home-manager

os/rebuild.sh

@@ -24,18 +24,23 @@ then
   exit 2
 fi
 
+nixosRebuild() {
+    # sudo so the eval cache is shared with nixos-rebuild
+    sudo nixos-rebuild --flake "$self#$HOSTNAME" "$@" --log-format internal-json |& nom --json
+}
+
 info "Evaluating"
 # Evaluating can take a lot of memory, and Nix doesn't free it until the program ends,
 # which can be limiting on memory-constrained devices. Hence the build step is separate.
 # Drawback: it will query info about missing paths twice
-# nix eval doesn't use the eval cache, so we do a nix build --dry-run
-# sudo so the eval cache is shared with nixos-rebuild
-json=$(time sudo nix build "$self#nixosConfigurations.$HOSTNAME.config.system.build.toplevel" --dry-run --json )
-toplevel=$(echo "$json" | jq '.[0].outputs.out' -r)
-derivation=$(echo "$json" | jq '.[0].drvPath' -r)
+nixosRebuild dry-build
 
 info "Building"
-sudo nom build "$derivation^*" --no-link "$@"
+tmpdir="$(mktemp --suffix -dry-build -d)"
+(cd "$tmpdir" && nixosRebuild build)
+toplevel="$(readlink -f "$tmpdir"/result)"
+rm "$tmpdir"/result
+rmdir "$tmpdir"
 
 info "Showing diff"
 nvd diff "$(readlink -f /nix/var/nix/profiles/system)" "$toplevel"
@@ -59,9 +64,12 @@ then
     if [ -n "$specialisation" ]
     then
         specialisationArgs=("--specialisation" "$specialisation")
+        echo "Currently running specialisation: $specialisation"
+    else
+        echo "Currently running unspecialized system"
     fi
 else
-    warn "Could not find link for $currentSystem, will switch to non-specialized system"
+    warn "Could not find link for $currentSystem, will switch to unspecialized system"
 fi
 
 
@@ -75,9 +83,10 @@ then
 fi
 if [ "$verb" = "test" ] || [ "$verb" = "switch" ] || [ "$confirm" = "y" ]
 then
-  info "Applying"
+  info "Installing passwords"
   "$toplevel/update-password-store"
-  sudo nixos-rebuild --flake "$self#$HOSTNAME" test "${specialisationArgs[@]}" "$@"
+  info "Applying"
+  nixosRebuild test "${specialisationArgs[@]}" "$@"
 fi
 
 # Set as boot
@@ -89,5 +98,5 @@ fi
 if [ "$verb" = "boot" ] || [ "$verb" = "switch" ] || [ "$confirm" = "y" ]
 then
   info "Setting as boot"
-  sudo nixos-rebuild --flake "$self#$HOSTNAME" boot "$@"
+  nixosRebuild boot "$@"
 fi