deploy: change script to install or update

Depending on user (root = install, user = update)

deploy

@@ -1,14 +1,20 @@
 #!/usr/bin/env bash
+set -e
+
 DOTFILES="$(cd $(dirname "${BASH_SOURCE:-${(%):-%x}}") && pwd -P)"
 PREFIX="${PREFIX:-/mnt}"
 NIXOSPREFIX="${PREFIX}/etc/nixos"
+NIXOSFLAGS="-I 'config=$DOTFILES/config' -I 'packages=$DOTFILES/packages'"
 HOST=${1:-${HOST:-kuro}}
 
-set -e
-if [[ ! -f "$DOTFILES/configuration.$HOST.nix" ]]; then
+if [ $EUID -nq 0 ]; then
+  sudo nix-channel --update
+  sudo nixos-rebuild $NIXOSFLAGS switch
+else
+  if [ ! -f "$DOTFILES/configuration.$HOST.nix" ]; then
     >&2 echo "No configuration exists for host '$HOST'"
     exit 1
-elif [[ ! -f "$NIXOSPREFIX/hardware-configuration.nix" ]]; then
+  elif [ ! -f "$NIXOSPREFIX/hardware-configuration.nix" ]; then
     >&2 echo "No hardware-configuration.nix file exists in $NIXOSPREFIX"
     >&2 echo "Did you forget to set up your partitions?"
     exit 2
@@ -31,6 +37,5 @@ nix-channel --add https://nixos.org/channels/nixpkgs-unstable nixpkgs-unstable
   nix-channel --update
 
   nixos-generate-config --root "$PREFIX"
-nixos-install --root "$PREFIX" \
-  -I "config=$DOTFILES/config" \
-  -I "packages=$DOTFILES/packages"
+  nixos-install --root "$PREFIX" $NIXOSFLAGS
+fi