fix: resolve Python symlinks and make Bluetooth permissions automatic
The setcap command fails on symlinks with "Invalid file 'setcap' for capability operation". On many systems (including Raspberry Pi OS), /usr/bin/python3 is a symlink to the versioned binary (e.g., /usr/bin/python3.13). The interactive prompt also required manual intervention during installation. Changes: - Automatically grant Bluetooth permissions (removed y/N prompt) - Detect if python3 is a symlink and resolve to actual binary using readlink -f - Verify resolved path is valid before applying setcap - Use getcap to verify capabilities were actually set - Added --skip-bt-permissions flag for users who want to skip this step - Improved error messages with specific troubleshooting steps - Show detected and resolved Python paths for transparency This makes installation fully automated while handling the symlink issue that was causing setcap failures on Raspberry Pi OS and other Debian-based systems. Fixes: "Invalid file 'setcap' for capability operation" error Tested on: Raspberry Pi Zero 2 W with Raspberry Pi OS Lite 64-bit (Debian Trixie) 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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1 changed files with 98 additions and 54 deletions
152
install.sh
152
install.sh
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@ -52,6 +52,7 @@ pip_install() {
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# Parse command line arguments
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CUSTOM_CONFIG_DIR=""
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SKIP_BLUEZ_EXPERIMENTAL=false
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SKIP_BT_PERMISSIONS=false
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while [[ $# -gt 0 ]]; do
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case $1 in
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--config)
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@ -62,6 +63,10 @@ while [[ $# -gt 0 ]]; do
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SKIP_BLUEZ_EXPERIMENTAL=true
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shift
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;;
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--skip-bt-permissions)
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SKIP_BT_PERMISSIONS=true
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shift
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;;
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-h|--help)
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echo "Usage: $0 [OPTIONS]"
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echo ""
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@ -70,6 +75,8 @@ while [[ $# -gt 0 ]]; do
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echo " (default: ~/.reticulum)"
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echo " --skip-experimental Skip enabling BlueZ experimental mode"
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echo " WARNING: May cause BLE connection failures"
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echo " --skip-bt-permissions Skip granting Bluetooth permissions"
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echo " (you will need to run rnsd with sudo)"
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echo " -h, --help Show this help message"
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exit 0
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;;
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@ -358,71 +365,108 @@ echo
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# Step 5: Bluetooth permissions
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print_header "Bluetooth Permissions"
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print_info "For BLE to work without root, Python needs network capabilities"
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echo
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# Check if user wants to skip Bluetooth permissions
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if [ "$SKIP_BT_PERMISSIONS" = true ]; then
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print_warning "Skipping Bluetooth permissions (--skip-bt-permissions flag)"
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print_info "You will need to run rnsd with sudo, or grant permissions manually:"
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echo " sudo setcap 'cap_net_raw,cap_net_admin+eip' \$(readlink -f \$(which python3))"
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echo
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else
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print_info "For BLE to work without root, Python needs network capabilities"
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print_info "Automatically granting capabilities to Python..."
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echo
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# Check if setcap is available
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if ! command -v setcap &> /dev/null; then
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print_error "setcap command not found"
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print_info "Installing libcap2-bin package..."
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if command -v apt-get &> /dev/null; then
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if [ "$EUID" -eq 0 ]; then
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apt-get install -y libcap2-bin
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else
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sudo apt-get install -y libcap2-bin
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fi
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elif command -v pacman &> /dev/null; then
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if [ "$EUID" -eq 0 ]; then
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pacman -S --needed --noconfirm libcap
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else
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sudo pacman -S --needed --noconfirm libcap
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fi
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else
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print_error "Could not install libcap2-bin/libcap automatically"
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print_warning "Please install manually and re-run the installer"
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echo
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fi
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# Verify setcap is now available
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# Check if setcap is available
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if ! command -v setcap &> /dev/null; then
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print_error "setcap still not available after installation attempt"
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print_warning "You will need to run rnsd with sudo, or manually install libcap2-bin"
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echo
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else
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print_success "setcap installed successfully"
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echo
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fi
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fi
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print_error "setcap command not found"
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print_info "Installing libcap2-bin package..."
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PYTHON_PATH=$(which python3)
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echo "The following command will grant capabilities to Python:"
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echo " sudo setcap 'cap_net_raw,cap_net_admin+eip' $PYTHON_PATH"
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echo
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read -p "Grant Bluetooth permissions now? (y/N) " -n 1 -r
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echo
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if [[ $REPLY =~ ^[Yy]$ ]]; then
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if command -v setcap &> /dev/null; then
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sudo setcap 'cap_net_raw,cap_net_admin+eip' "$PYTHON_PATH"
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if [ $? -eq 0 ]; then
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print_success "Bluetooth permissions granted"
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if command -v apt-get &> /dev/null; then
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if [ "$EUID" -eq 0 ]; then
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apt-get install -y libcap2-bin
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else
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sudo apt-get install -y libcap2-bin
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fi
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elif command -v pacman &> /dev/null; then
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if [ "$EUID" -eq 0 ]; then
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pacman -S --needed --noconfirm libcap
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else
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sudo pacman -S --needed --noconfirm libcap
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fi
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else
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print_error "Failed to grant Bluetooth permissions"
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print_error "Could not install libcap2-bin/libcap automatically"
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print_warning "Please install manually and re-run the installer"
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echo
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fi
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# Verify setcap is now available
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if ! command -v setcap &> /dev/null; then
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print_error "setcap still not available after installation attempt"
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print_warning "You will need to run rnsd with sudo, or manually install libcap2-bin"
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echo
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else
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print_success "setcap installed successfully"
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echo
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fi
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fi
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if command -v setcap &> /dev/null; then
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# Get python3 path
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PYTHON_PATH=$(which python3)
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print_info "Detected Python at: $PYTHON_PATH"
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# Check if it's a symlink and resolve it
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if [ -L "$PYTHON_PATH" ]; then
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print_warning "Python3 is a symlink (setcap requires the actual binary)"
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PYTHON_REAL=$(readlink -f "$PYTHON_PATH")
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print_info "Resolved to actual binary: $PYTHON_REAL"
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# Verify the resolved path exists and is a file
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if [ ! -f "$PYTHON_REAL" ]; then
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print_error "Could not resolve Python binary: $PYTHON_REAL"
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print_warning "You may need to run rnsd with sudo"
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echo
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elif [ -L "$PYTHON_REAL" ]; then
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print_error "Python path is still a symlink after resolution"
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print_warning "Manual intervention required - you may need to run rnsd with sudo"
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echo
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else
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PYTHON_PATH="$PYTHON_REAL"
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fi
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fi
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# Grant capabilities if we have a valid path
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if [ -f "$PYTHON_PATH" ] && [ ! -L "$PYTHON_PATH" ]; then
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print_info "Granting capabilities to: $PYTHON_PATH"
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sudo setcap 'cap_net_raw,cap_net_admin+eip' "$PYTHON_PATH"
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if [ $? -eq 0 ]; then
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print_success "Bluetooth permissions granted successfully"
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# Verify capabilities were actually set
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if command -v getcap &> /dev/null; then
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CAPS=$(getcap "$PYTHON_PATH" 2>/dev/null)
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if [ -n "$CAPS" ]; then
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print_info "Verified: $CAPS"
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fi
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fi
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else
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print_error "Failed to grant Bluetooth permissions"
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print_warning "You may need to run rnsd with sudo"
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echo
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print_info "To grant permissions manually, run:"
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echo " sudo setcap 'cap_net_raw,cap_net_admin+eip' $PYTHON_PATH"
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fi
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else
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print_error "Could not determine valid Python binary path"
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print_warning "You may need to run rnsd with sudo"
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fi
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else
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print_error "setcap command not available, cannot grant permissions"
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print_warning "You will need to run rnsd with sudo"
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fi
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else
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print_warning "Skipped. You may need to run rnsd with sudo"
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echo " To grant permissions later, run:"
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echo " sudo setcap 'cap_net_raw,cap_net_admin+eip' \$(which python3)"
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fi
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echo
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echo
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fi
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# Step 5A: BlueZ Experimental Mode
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print_header "BlueZ Experimental Mode"
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