/lib/udev/rules.d/56-hpmud.rules is in hplip 3.16.3+repack0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | # HPLIP udev rules file. Notify console user if plugin support is required for this device.
ACTION!="add", GOTO="hpmud_rules_end"
SUBSYSTEM=="ppdev", OWNER="root", GROUP="lp", MODE="0664"
SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device", GOTO="hpmud_usb_rules"
GOTO="hpmud_rules_end"
LABEL="hpmud_usb_rules"
ENV{ID_USB_INTERFACES}=="", IMPORT{builtin}="usb_id"
# ENV{ID_HPLIP}="1" is for Ubuntu udev-acl
ATTR{idVendor}=="03f0", ENV{ID_USB_INTERFACES}=="*:0701??:*|*:08????:", OWNER="root", GROUP="lp", MODE="0664", ENV{libsane_matched}="yes", ENV{hp_test}="yes", ENV{ID_HPLIP}="1"
# This rule will check the smart install feature, plugin status and firmware download for the required printers.
ENV{hp_test}=="yes", PROGRAM="/bin/sh -c 'logger -p user.info loading HP Device $env{BUSNUM} $env{DEVNUM}'", RUN+="/bin/sh -c '/usr/bin/nohup /usr/bin/hp-config_usb_printer $env{BUSNUM}:$env{DEVNUM}'"
LABEL="hpmud_rules_end"
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