21 lines
871 B
Markdown
21 lines
871 B
Markdown
# udev
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## Start (and stop) a systemd daemon
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Create a udev rule to start the daemon:
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```
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% cat /etc/udev/rules.d/10-bluetooth-service.rules
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ACTION=="add", SUBSYSTEM=="usb", ATTRS{idVendor}=="0a5c", ATTRS{idProduct}=="21e8", TAG+="systemd", ENV{SYSTEMD_WANTS}="bluetooth.service"
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```
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This one starts the bluetooth systemd service when a specific usb bluetooth dongle is added to the system.
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If you need to find `idVendor` and `idProduct` you can start `udevadm monitor --property` while plugging the usb device in and out.
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To stop the daemon again you need to edit the systemd service file of the daemon - in this case `systemctl edit bluetooth.service`:
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```
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[Unit]
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BindsTo=sys-subsystem-bluetooth-devices-hci0.device
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After=sys-subsystem-bluetooth-devices-hci0.device
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```
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The device name in this case is found by `systemctl list-units --all --full | grep "\.device"`.
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