Merge pull request #7218 from Gabriella439/headless

Add `--yes` option for Nix installation script

scripts/install-multi-user.sh

@@ -58,7 +58,7 @@ readonly EXTRACTED_NIX_PATH="$(dirname "$0")"
 
 readonly ROOT_HOME=~root
 
-if [ -t 0 ]; then
+if [ -t 0 ] && [ -z "${NIX_INSTALLER_YES:-}" ]; then
     readonly IS_HEADLESS='no'
 else
     readonly IS_HEADLESS='yes'

scripts/install-nix-from-closure.sh

@@ -71,6 +71,8 @@ while [ $# -gt 0 ]; do
         #     # intentional tail space
         #     ACTIONS="${ACTIONS}uninstall "
         #     ;;
+        --yes)
+            export NIX_INSTALLER_YES=1;;
         --no-channel-add)
             export NIX_INSTALLER_NO_CHANNEL_ADD=1;;
         --daemon-user-count)
@@ -90,7 +92,7 @@ while [ $# -gt 0 ]; do
             shift;;
         *)
             {
-                echo "Nix Installer [--daemon|--no-daemon] [--daemon-user-count INT] [--no-channel-add] [--no-modify-profile] [--nix-extra-conf-file FILE]"
+                echo "Nix Installer [--daemon|--no-daemon] [--daemon-user-count INT] [--yes] [--no-channel-add] [--no-modify-profile] [--nix-extra-conf-file FILE]"
 
                 echo "Choose installation method."
                 echo ""
@@ -104,6 +106,8 @@ while [ $# -gt 0 ]; do
                 echo "              trivial to uninstall."
                 echo "              (default)"
                 echo ""
+                echo " --yes:               Run the script non-interactively, accepting all prompts."
+                echo ""
                 echo " --no-channel-add:    Don't add any channels. nixpkgs-unstable is installed by default."
                 echo ""
                 echo " --no-modify-profile: Don't modify the user profile to automatically load nix."