树莓派Google Assistant SDK开机自启配置求助（使用hotword.py）

Hey Jerome, I’ve been there—systemd services can feel a bit intimidating at first, but once you have the right config file, it’s smooth sailing. Let’s get your hotword.py running automatically every time your Pi boots up.

Step 1: Create the Systemd Service File #

First, we’ll make a dedicated service file for your Google Assistant script. Open a terminal and run this command to create/edit the file with nano:

sudo nano /etc/systemd/system/google-assistant-hotword.service

Paste in the following content, making sure to replace the placeholders with your actual details:

[Unit]
Description=Google Assistant Hotword Service
After=network.target pulseaudio.target
Wants=network.target pulseaudio.target

[Service]
User=pi  # Replace with your Raspberry Pi username if not 'pi'
ExecStart=/usr/bin/python3 /home/pi/path/to/your/hotword.py  # Replace with the FULL path to your hotword.py script
Restart=always
RestartSec=5
Environment="DISPLAY=:0"  # Needed if your script relies on GUI/visual elements (adjust if not)
Environment="XAUTHORITY=/home/pi/.Xauthority"  # Same as above, adjust username if needed

[Install]
WantedBy=multi-user.target

Let me quickly break down what each section does:

• [Unit]: Tells systemd what this service is, and that it should wait for network and PulseAudio (for audio functionality) to start before launching.
• [Service]: Defines how the service runs—what user to execute it as, the exact command to start your script, and to restart it automatically if it crashes (super handy for reliability).
• [Install]: Tells systemd when to trigger this service (multi-user.target means it runs once the Pi is ready for user sessions).

Step 2: Save and Enable the Service #

Once you’ve updated the paths and username, save the file in nano by pressing Ctrl+O, hit Enter, then exit with Ctrl+X.

Next, reload systemd to recognize the new service:

sudo systemctl daemon-reload

Enable the service so it starts on boot:

sudo systemctl enable google-assistant-hotword.service

You can start it right away to test without rebooting:

sudo systemctl start google-assistant-hotword.service

Step 3: Verify It’s Working #

Check the status of the service to confirm it’s running:

sudo systemctl status google-assistant-hotword.service

If something goes wrong, you can view detailed logs to debug:

journalctl -u google-assistant-hotword.service -f

Quick Tips to Avoid Issues #

• Make sure your hotword.py script has executable permissions: run chmod +x /home/pi/path/to/your/hotword.py
• Use absolute paths for everything in your script (like paths to credentials files) — relative paths can cause problems when running via systemd.
• If your script uses a virtual environment, update the ExecStart line to point to the Python executable inside your venv (e.g., /home/pi/venv/bin/python3 instead of /usr/bin/python3).

That should do it! Reboot your Pi to confirm it starts automatically, and you’re all set.

内容的提问来源于stack exchange，提问作者JEROME C