It seems that with a 70-printers.rules as follows at least a correct
service name is generated
----------
# Low-level USB device add trigger
ACTION=="add", SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device",
ENV{ID_USB_INTERFACES}=="*:0701??:*", TAG+="udev-configure-printer",
TAG+="systemd", PROGRAM="/bin/systemd-escape
[email protected] %p", ENV{SYSTEMD_WANTS}+="'%c'"
# Low-level USB device remove trigger
ACTION=="remove", SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device",
ENV{ID_USB_INTERFACES}=="*:0701*:*", RUN+="udev-configure-printer remove %p"
----------
Note that in the first rule the systemd-escape command has NO "-p"
option and that the %c for ENV{SYSTEMD_WANTS} has extra single quotes.
Compared to the original file only these single quotes got added.
After restarting UDEV with
sudo udevadm control --reload
and re-plugging the printer in most cases the service does not get
started.
systemctl status 'udev-configure-printer@-devices-
pci0000:00-0000:00:14.0-usb2-2\x2d2.service' > status.txt
gives something like
----------
● udev-configure-printer@devices-pci0000:00-0000:00:14.0-usb2-2\x2d2.service -
Automatic USB/Bluetooth printer setup
(devices-pci0000:00-0000:00:14.0-usb2-2\x2d2)
Loaded: loaded (/lib/systemd/system/[email protected]; static;
vendor preset: enabled)
Active: inactive (dead)
----------
In such a case one can start the service manually with
sudo systemctl start 'udev-configure-printer@-devices-
pci0000:00-0000:00:14.0-usb2-2\x2d2.service'
and this starts correctly udev-configure printer which sets up the
printer (and starts ippusbxd if needed).
In some very few cases the service actually gets correctly started (and
the printer set up) when one plugs the printer, but this happens rarely
(can there be some kind of race condition?).
So this only rarely happening automatic start of the printer setup
service is now the problem. The escaping seems to be fixed by the extra
single quotes.
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https://bugs.launchpad.net/bugs/1721839
Title:
Services asked for by UDEV do not get triggered
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