Arch Linux

Captain

Member

Registered: 2019-09-22

Posts: 2

udev does not create by-id symlink

Hello.
After another update udev seem to ignore the persistent-input rule and does not create a symlink in /dev/by-id for an input device if bInterfaceNumber is equal to 0.
E.g I got a Logitech G502 mouse and the symlink is only created for interface 01 (which is some control crap), but not for the mouse input. Looking into /lib/udev/rules.d/60-persistent-input.rules:

# do not edit this file, it will be overwritten on update

ACTION=="remove", GOTO="persistent_input_end"
SUBSYSTEM!="input", GOTO="persistent_input_end"
SUBSYSTEMS=="bluetooth", ENV{ID_BUS}="bluetooth", GOTO="persistent_input_end"
# Bluetooth devices don't always have the bluetooth subsystem
ATTRS{id/bustype}=="0005", ENV{ID_BUS}="bluetooth", GOTO="persistent_input_end"
SUBSYSTEMS=="rmi4", ENV{ID_BUS}="rmi"
SUBSYSTEMS=="serio", ENV{ID_BUS}="i8042"

SUBSYSTEMS=="usb", ENV{ID_BUS}=="", IMPORT{builtin}="usb_id"

# determine class name for persistent symlinks
ENV{ID_INPUT_KEYBOARD}=="?*", ENV{.INPUT_CLASS}="kbd"
ENV{ID_INPUT_MOUSE}=="?*", ENV{.INPUT_CLASS}="mouse"
ENV{ID_INPUT_TOUCHPAD}=="?*", ENV{.INPUT_CLASS}="mouse"
ENV{ID_INPUT_TABLET}=="?*", ENV{.INPUT_CLASS}="mouse"
ENV{ID_INPUT_JOYSTICK}=="?*", ENV{.INPUT_CLASS}="joystick"
DRIVERS=="pcspkr", ENV{.INPUT_CLASS}="spkr"
ATTRS{name}=="*dvb*|*DVB*|* IR *", ENV{.INPUT_CLASS}="ir"

# fill empty serial number
ENV{.INPUT_CLASS}=="?*", ENV{ID_SERIAL}=="", ENV{ID_SERIAL}="noserial"

# by-id links
KERNEL=="mouse*|js*", ENV{ID_BUS}=="?*", ENV{.INPUT_CLASS}=="?*", ATTRS{bInterfaceNumber}=="|00", SYMLINK+="input/by-id/$env{ID_BUS}-$env{ID_SERIAL}-$env{.INPUT_CLASS}"
KERNEL=="mouse*|js*", ENV{ID_BUS}=="?*", ENV{.INPUT_CLASS}=="?*", ATTRS{bInterfaceNumber}=="?*", ATTRS{bInterfaceNumber}!="00", SYMLINK+="input/by-id/$env{ID_BUS}-$env{ID_SERIAL}-if$attr{bInterfaceNumber}-$env{.INPUT_CLASS}"
KERNEL=="event*", ENV{ID_BUS}=="?*", ENV{.INPUT_CLASS}=="?*", ATTRS{bInterfaceNumber}=="|00", SYMLINK+="input/by-id/$env{ID_BUS}-$env{ID_SERIAL}-event-$env{.INPUT_CLASS}"
KERNEL=="event*", ENV{ID_BUS}=="?*", ENV{.INPUT_CLASS}=="?*", ATTRS{bInterfaceNumber}=="?*", ATTRS{bInterfaceNumber}!="00", SYMLINK+="input/by-id/$env{ID_BUS}-$env{ID_SERIAL}-if$attr{bInterfaceNumber}-event-$env{.INPUT_CLASS}"
# allow empty class for USB devices, by appending the interface number
SUBSYSTEMS=="usb", ENV{ID_BUS}=="?*", KERNEL=="event*", ENV{.INPUT_CLASS}=="", ATTRS{bInterfaceNumber}=="?*", \
  SYMLINK+="input/by-id/$env{ID_BUS}-$env{ID_SERIAL}-event-if$attr{bInterfaceNumber}"

# by-path
SUBSYSTEMS=="pci|usb|platform|acpi", IMPORT{builtin}="path_id"
ENV{ID_PATH}=="?*", KERNEL=="mouse*|js*", ENV{.INPUT_CLASS}=="?*", SYMLINK+="input/by-path/$env{ID_PATH}-$env{.INPUT_CLASS}"
ENV{ID_PATH}=="?*", KERNEL=="event*", ENV{.INPUT_CLASS}=="?*", SYMLINK+="input/by-path/$env{ID_PATH}-event-$env{.INPUT_CLASS}"
# allow empty class for platform and usb devices; platform supports only a single interface that way
SUBSYSTEMS=="usb|platform", ENV{ID_PATH}=="?*", KERNEL=="event*", ENV{.INPUT_CLASS}=="", \
  SYMLINK+="input/by-path/$env{ID_PATH}-event"

LABEL="persistent_input_end"

The link is still created in /dev/by-path. Any ideas?

loqs

Member

Registered: 2014-03-06

Posts: 19,052

Re: udev does not create by-id symlink

You did not include which versions are affected so at a guess https://github.com/systemd/systemd/issues/13518

Captain

Member

Registered: 2019-09-22

Posts: 2

Re: udev does not create by-id symlink

Looks like exactly the issue. Thanks a lot.