deploy: change script to install or update

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

deploy

@@ -1,21 +1,27 @@
 #!/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
-fi
+  fi
 
-mkdir -p "$NIXOSPREFIX"
-cat << EOF > "$NIXOSPREFIX/configuration.nix"
+  mkdir -p "$NIXOSPREFIX"
+  cat << EOF > "$NIXOSPREFIX/configuration.nix"
 { config, ... }:
 {
   imports = [
@@ -25,12 +31,11 @@ cat << EOF > "$NIXOSPREFIX/configuration.nix"
 }
 EOF
 
-nix-channel --add https://nixos.org/channels/nixos-19.09 nixos
-nix-channel --add https://github.com/rycee/home-manager/archive/master.tar.gz home-manager
-nix-channel --add https://nixos.org/channels/nixpkgs-unstable nixpkgs-unstable
-nix-channel --update
+  nix-channel --add https://nixos.org/channels/nixos-19.09 nixos
+  nix-channel --add https://github.com/rycee/home-manager/archive/master.tar.gz home-manager
+  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-generate-config --root "$PREFIX"
+  nixos-install --root "$PREFIX" $NIXOSFLAGS
+fi