[Bug 294303] devd(8) overwrites "bus" variable for "nomatch" event

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=294303

            Bug ID: 294303
           Summary: devd(8) overwrites "bus" variable for "nomatch" event
           Product: Base System
           Version: 15.0-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: phk@FreeBSD.org

When my Canon Lide printer is attach, no driver matches and devd(8) goes
quantity surveying to find something.

When doing that it sets two different values for "bus":

  setting timestamp=1775570495.177197
  setting vm_guest=none
  setting bus=0
  setting hubaddr=1
  setting port=2
  setting devaddr=2
  setting interface=2
  setting ugen=ugen0.2
  setting vendor=0x04a9
  setting product=0x1912
  setting devclass=0x00
  setting devsubclass=0x00
  setting devproto=0x00
  setting sernum=4F3AFB
  setting release=0x0100
  setting mode=host
  setting intclass=0xff
  setting intsubclass=0xff
  setting intprotocol=0xff
  setting bus=uhub0

I'm catching that with:

  nomatch 1000 {
        match "vendor"          "0x04a9";
        match "product"         "0x1912";
        match "sernum"          "4F3AFB";
        action "echo FOO!; chmod 666 /dev/usb/0.$devaddr.0";
  };

But have to hard code the USB bus name because "uhub0" is not what I need.

See also: #198015 which seems to be the same problem presumably fixed 10 years
ago?

Feel free to stick this example in the handbook's section 7.7.3.2:

    7.7.3.2. Using the Device State Change Daemon (devd(8))
    To be written...

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