rules: add v4l persistent links

Maybe we will have this working, finally. Thanks to Kees and Brandon.

etc/udev/rules.d/60-persistent-v4l.rules

@@ -0,0 +1,14 @@
+# do not edit this file, it will be overwritten on update
+
+ACTION!="add|change", GOTO="persistent_v4l_end"
+SUBSYSTEM!="video4linux", GOTO="persistent_v4l_end"
+
+# 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*|vbi*", SYMLINK+="v4l/by-path/$env{ID_PATH}-video-index$attr{index}"
+ENV{ID_PATH}=="?*", KERNEL=="audio*", SYMLINK+="v4l/by-path/$env{ID_PATH}-audio-index$attr{index}"
+
+LABEL="persistent_v4l_end"