Systemd/rules/rules.d/60-persistent-v4l.rules

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# do not edit this file, it will be overwritten on update
ACTION!="add|change", GOTO="persistent_v4l_end"
SUBSYSTEM!="video4linux", GOTO="persistent_v4l_end"
SUBSYSTEMS=="usb", IMPORT{program}="usb_id --export %p"
KERNEL=="video*", ENV{ID_SERIAL}=="?*", SYMLINK+="v4l/by-id/$env{ID_BUS}-$env{ID_SERIAL}-video-index$attr{index}"
# check for valid "index" number
TEST!="index", GOTO="persistent_v4l_end"
ATTR{index}!="?*", GOTO="persistent_v4l_end"
IMPORT{program}="path_id %p"
ENV{ID_PATH}=="?*", KERNEL=="video*", SYMLINK+="v4l/by-path/$env{ID_PATH}-video-index$attr{index}"
ENV{ID_PATH}=="?*", KERNEL=="vbi*", SYMLINK+="v4l/by-path/$env{ID_PATH}-vbi-index$attr{index}"
ENV{ID_PATH}=="?*", KERNEL=="audio*", SYMLINK+="v4l/by-path/$env{ID_PATH}-audio-index$attr{index}"
LABEL="persistent_v4l_end"