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
--template=udev-configure-printer@.service %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/udev-configure-printer@.service; 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
Status in systemd package in Ubuntu:
Confirmed
Bug description:
The packages system-config-printer-udev and ippusbxd are installed,
having the following UDEV rule files:
/lib/udev/rules.d/70-printers.rules
----------
# 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
--template=udev-configure-printer@.service %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"
----------
/lib/udev/rules.d/55-ippusbxd.rules
----------
# ippusbxd udev rules file
ACTION=="add", SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device"
ENV{ID_USB_INTERFACES}=="*:070104:*", OWNER="root", GROUP="lp", MODE="0664",
PROGRAM="/bin/systemd-escape --template=ippusbxd@.service
$env{BUSNUM}:$env{DEVNUM}", ENV{SYSTEMD_WANTS}+="%c"
----------
If I turn on an appropriate printer (USB, supporting IPP-over-USB,
here the HP DeskJet 2540) I get in the output of "udevadm monitor
--environment"
----------
UDEV [17527.514150] add /devices/pci0000:00/0000:00:14.0/usb2/2-2 (usb)
ACTION=add
BUSNUM=002
DEVNAME=/dev/bus/usb/002/033
DEVNUM=033
DEVPATH=/devices/pci0000:00/0000:00:14.0/usb2/2-2
DEVTYPE=usb_device
DRIVER=usb
ID_BUS=usb
ID_MODEL=Deskjet_2540_series
ID_MODEL_ENC=Deskjet\x202540\x20series
ID_MODEL_ID=c211
ID_REVISION=0100
ID_SERIAL=HP_Deskjet_2540_series_BR54BFB02C05XK
ID_SERIAL_SHORT=BR54BFB02C05XK
ID_USB_INTERFACES=:ffcc00:070104:070102:ff0401:
ID_VENDOR=HP
ID_VENDOR_ENC=HP
ID_VENDOR_FROM_DATABASE=Hewlett-Packard
ID_VENDOR_ID=03f0
MAJOR=189
MINOR=160
PRODUCT=3f0/c211/100
SEQNUM=9891
SUBSYSTEM=usb
SYSTEMD_WANTS=ippusbxd@002:033.service
udev-configure-printer@-devices-pci0000:00-0000:00:14.0-usb2-2\x2d2.service
printer.target
TAGS=:udev-configure-printer:systemd:
TYPE=0/0/0
USEC_INITIALIZED=17527513940
UDEV [17527.517724] add
/devices/pci0000:00/0000:00:14.0/usb2/2-2/2-2:1.0 (usb)
.MM_USBIFNUM=00
ACTION=add
DEVPATH=/devices/pci0000:00/0000:00:14.0/usb2/2-2/2-2:1.0
DEVTYPE=usb_interface
ID_VENDOR_FROM_DATABASE=Hewlett-Packard
INTERFACE=255/204/0
MODALIAS=usb:v03F0pC211d0100dc00dsc00dp00icFFiscCCip00in00
PRODUCT=3f0/c211/100
SEQNUM=9892
SUBSYSTEM=usb
TYPE=0/0/0
USEC_INITIALIZED=17527517478
UDEV [17527.522565] add
/devices/pci0000:00/0000:00:14.0/usb2/2-2/2-2:1.2 (usb)
.MM_USBIFNUM=02
ACTION=add
DEVPATH=/devices/pci0000:00/0000:00:14.0/usb2/2-2/2-2:1.2
DEVTYPE=usb_interface
ID_VENDOR_FROM_DATABASE=Hewlett-Packard
INTERFACE=255/4/1
MODALIAS=usb:v03F0pC211d0100dc00dsc00dp00icFFisc04ip01in02
PRODUCT=3f0/c211/100
SEQNUM=9895
SUBSYSTEM=usb
TYPE=0/0/0
USEC_INITIALIZED=17527522332
UDEV [17527.523761] add
/devices/pci0000:00/0000:00:14.0/usb2/2-2/2-2:1.1 (usb)
.MM_USBIFNUM=01
ACTION=add
DEVPATH=/devices/pci0000:00/0000:00:14.0/usb2/2-2/2-2:1.1
DEVTYPE=usb_interface
DRIVER=usblp
ID_VENDOR_FROM_DATABASE=Hewlett-Packard
INTERFACE=7/1/2
MODALIAS=usb:v03F0pC211d0100dc00dsc00dp00ic07isc01ip02in01
PRODUCT=3f0/c211/100
SEQNUM=9893
SUBSYSTEM=usb
TYPE=0/0/0
USEC_INITIALIZED=17527523500
UDEV [17527.527275] add
/devices/pci0000:00/0000:00:14.0/usb2/2-2/2-2:1.1/usbmisc/lp1 (usbmisc)
.MM_USBIFNUM=01
ACTION=add
DEVNAME=/dev/usb/lp1
DEVPATH=/devices/pci0000:00/0000:00:14.0/usb2/2-2/2-2:1.1/usbmisc/lp1
MAJOR=180
MINOR=1
SEQNUM=9894
SUBSYSTEM=usbmisc
USEC_INITIALIZED=17527527175
----------
Here one can see that the UDEV rules files are correct, leading to the
correct systemd services being requested
SYSTEMD_WANTS=ippusbxd@002:033.service udev-configure-printer
@-devices-pci0000:00-0000:00:14.0-usb2-2\x2d2.service printer.target
but neither the service ippusbxd@002:033.service nor the service udev-
configure-printer@-devices-pci0000:00-0000:00:14.0-usb2-2\x2d2.service
get started (note that I have put the .service file for ippusbxd in
place by "sudo cp /usr/share/doc/ippusbxd/examples/ippusbxd@.service
/lib/systemd/system/").
I can start each of these services manually though:
sudo systemctl start 'udev-configure-printer@-devices-
pci0000:00-0000:00:14.0-usb2-2\x2d2.service'
sudo systemctl start ippusbxd@002:033.service
In each case ippusbxd gets started for this printer and a print queue
auto-created.
What I expect is that the services get automatically started (and that
worked in 17.04) so that after plugging in an USB printer I can
immediately print as the print queue gets created automatically.
The "udev-configure-printer..." service works for all USB printers,
not only IPP-over-USB (it automatically recognizes the printer typ and
does an appropriate setup).
This is a regression as we had always automatic setup of USB printers.
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