script support for doas added (actually now)

install-dependencies-deb.sh

@@ -13,7 +13,6 @@
 #   ./install-dependencies-deb.sh --no-build # install deps + npm install only
 #   ./install-dependencies-deb.sh --no-npm   # system packages only
 #
-alias sudo=doas
 set -euo pipefail
 
 MIN_NODE_MAJOR=20
@@ -66,12 +65,19 @@ case "${ID:-}${ID_LIKE:-}" in
 esac
 
 # --- root / sudo helper ---------------------------------------------------
+# Prefer sudo when present, otherwise fall back to OpenDoas (doas).
+SUDO=""
+SUDO_ENV_FLAG=""
 if [ "$(id -u)" -eq 0 ]; then
   SUDO=""
 elif command -v sudo >/dev/null 2>&1; then
   SUDO="sudo"
+  SUDO_ENV_FLAG="-E"   # sudo resets the environment by default; keep ours
+elif command -v doas >/dev/null 2>&1; then
+  SUDO="doas"
+  SUDO_ENV_FLAG=""     # doas has no -E; it preserves the environment itself
 else
-  die "Not root and 'sudo' is not installed. Re-run as root."
+  die "Not root and neither 'sudo' nor 'doas' is installed. Re-run as root."
 fi
 
 # --- system packages ------------------------------------------------------
@@ -108,7 +114,7 @@ else
     warn "Node.js $(node -v) is too old for Next.js 16; installing current LTS."
   fi
   log "Installing Node.js LTS from NodeSource"
-  curl -fsSL https://deb.nodesource.com/setup_lts.x | $SUDO -E bash -
+  curl -fsSL https://deb.nodesource.com/setup_lts.x | $SUDO $SUDO_ENV_FLAG bash -
   $SUDO apt-get install -y nodejs
 fi