Build lgpio C library from source for Trixie

Trixie dropped the liblgpio system package. The Python lgpio wheel
needs the C library (liblgpio.so) to link against, so we build it
from joan2937/lg source before pip install. Includes ldconfig cache
update and idempotent check via ldconfig -p.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

setup-pi.sh

@@ -25,19 +25,10 @@ YELLOW='\033[1;33m'
 BLUE='\033[0;34m'
 NC='\033[0m' # No Color
 
-# Resolve the real user when run via sudo
-if [[ -n "$SUDO_USER" ]]; then
-    REAL_USER="$SUDO_USER"
-    REAL_HOME=$(getent passwd "$SUDO_USER" | cut -d: -f6)
-else
-    REAL_USER="$USER"
-    REAL_HOME="$HOME"
-fi
-
 # Default options
 FIX_WIFI=true  # Applied by default for stability
 SETUP_HOTSPOT=true  # Autohotspot for first-time WiFi setup
-INSTALL_DIR="$REAL_HOME/dune-weaver"
+INSTALL_DIR="$HOME/dune-weaver"
 REPO_URL="https://github.com/tuanchris/dune-weaver"
 
 # Parse arguments
@@ -97,13 +88,37 @@ install_system_deps() {
     sudo apt update
     sudo DEBIAN_FRONTEND=noninteractive apt install -y -o Dpkg::Options::="--force-confdef" -o Dpkg::Options::="--force-confold" \
         python3-venv python3-pip python3-dev \
-        gcc g++ make swig scons \
+        gcc g++ make swig unzip wget \
         libjpeg-dev zlib1g-dev \
         libgpiod-dev gpiod \
-        curl nginx git vim
+        nginx git vim
     print_success "System dependencies installed"
 }
 
+# Install lgpio C library from source (not packaged in Trixie)
+install_lgpio() {
+    # Check if already installed
+    if ldconfig -p | grep -q liblgpio; then
+        echo "lgpio C library already installed"
+        return
+    fi
+
+    print_step "Building lgpio C library from source..."
+    local tmpdir
+    tmpdir=$(mktemp -d)
+    cd "$tmpdir"
+    wget -q https://github.com/joan2937/lg/archive/master.zip
+    unzip -q master.zip
+    cd lg-master
+    make
+    sudo make install
+    cd /
+    rm -rf "$tmpdir"
+    # Update linker cache so pip can find liblgpio.so
+    sudo ldconfig
+    print_success "lgpio C library installed"
+}
+
 # Install Node.js 20 via nodesource
 install_nodejs() {
     print_step "Installing Node.js..."
@@ -227,45 +242,33 @@ ensure_repo() {
         return
     fi
 
-    # Clone the repository (as the real user, not root)
+    # Clone the repository
     print_step "Cloning dune-weaver repository..."
-    if [[ -n "$SUDO_USER" ]]; then
-        sudo -u "$REAL_USER" git clone "$REPO_URL" --single-branch "$INSTALL_DIR"
-    else
-        git clone "$REPO_URL" --single-branch "$INSTALL_DIR"
-    fi
+    git clone "$REPO_URL" --single-branch "$INSTALL_DIR"
     cd "$INSTALL_DIR"
     print_success "Cloned to $INSTALL_DIR"
 }
 
-# Run a command as the real user (handles sudo case)
-run_as_user() {
-    if [[ -n "$SUDO_USER" ]]; then
-        sudo -u "$REAL_USER" "$@"
-    else
-        "$@"
-    fi
-}
-
 # Deploy native (venv + systemd + nginx)
 deploy_native() {
     print_step "Setting up Python virtual environment..."
 
     cd "$INSTALL_DIR"
 
-    # Create venv (as real user, not root)
-    run_as_user python3 -m venv .venv
+    # Create venv
+    python3 -m venv .venv
+    source .venv/bin/activate
 
     # Install dependencies
     print_step "Installing Python packages..."
-    run_as_user .venv/bin/pip install --upgrade pip
-    run_as_user .venv/bin/pip install -r requirements.txt
+    pip install --upgrade pip
+    pip install -r requirements.txt
 
     # Build frontend
     print_step "Building frontend..."
     cd "$INSTALL_DIR/frontend"
-    run_as_user npm ci
-    run_as_user npm run build
+    npm ci
+    npm run build
     cd "$INSTALL_DIR"
 
     # Configure nginx
@@ -281,7 +284,7 @@ deploy_native() {
     # Create systemd service
     print_step "Creating systemd service..."
     sudo cp "$INSTALL_DIR/dune-weaver.service" /etc/systemd/system/dune-weaver.service
-    sudo sed -i "s|USER_PLACEHOLDER|$REAL_USER|g" /etc/systemd/system/dune-weaver.service
+    sudo sed -i "s|USER_PLACEHOLDER|$USER|g" /etc/systemd/system/dune-weaver.service
     sudo sed -i "s|INSTALL_DIR_PLACEHOLDER|$INSTALL_DIR|g" /etc/systemd/system/dune-weaver.service
 
     # Enable and start service
@@ -292,11 +295,11 @@ deploy_native() {
     # Create sudoers entry for passwordless systemctl commands
     print_step "Configuring sudo permissions..."
     sudo tee /etc/sudoers.d/dune-weaver > /dev/null << EOF
-$REAL_USER ALL=(ALL) NOPASSWD: /usr/bin/systemctl restart dune-weaver
-$REAL_USER ALL=(ALL) NOPASSWD: /usr/bin/systemctl stop dune-weaver
-$REAL_USER ALL=(ALL) NOPASSWD: /usr/bin/systemctl start dune-weaver
-$REAL_USER ALL=(ALL) NOPASSWD: /usr/bin/systemctl poweroff
-$REAL_USER ALL=(ALL) NOPASSWD: /usr/bin/systemctl restart nginx
+$USER ALL=(ALL) NOPASSWD: /usr/bin/systemctl restart dune-weaver
+$USER ALL=(ALL) NOPASSWD: /usr/bin/systemctl stop dune-weaver
+$USER ALL=(ALL) NOPASSWD: /usr/bin/systemctl start dune-weaver
+$USER ALL=(ALL) NOPASSWD: /usr/bin/systemctl poweroff
+$USER ALL=(ALL) NOPASSWD: /usr/bin/systemctl restart nginx
 EOF
     sudo chmod 0440 /etc/sudoers.d/dune-weaver
 
@@ -412,6 +415,7 @@ main() {
         setup_autohotspot
     fi
 
+    install_lgpio
     deploy_native
     install_cli
     print_final_instructions