Re: action does not trigger on remove, only on add

[Moshe Yudkowsky <msha5_17@bl.com>]

> This never worked, cause there are no sysfs files to match against
> when the device is gone.

OK, it must have been some previous script that worked on unplug. What 
would be the correct way -- the recommended, best-practices way -- to 
match on unplug, if I match on a SYSFS variable on plugin?

If udevmonitor shows:

 > ID_VENDOR=iriver
 > ID_MODEL=MassStorage_Disc
 > ID_REVISION\001
 > ID_SERIAL=iriver_MassStorage_Disc
 > ID_TYPE=disk
 > ID_BUS=usb

then in what way is ID_VENDOR accessible to a script?

I could set an ENV variable on plugin  and then match it again at 
unplug, I suppose. But is there a better method? ENV is a bit difficult 
to work with because it doesn't accept %p and similar variables to set. 
While I can certainly code a solution that fixes just this problem, I 
prefer broader solutions.

Here's a plea for some slight changes in the output format for 
udevmonitor. One problem I always have whenever I sit down to work with 
udev is matching the output of udevmonitor with the various variables 
mentioned in the documentaion.  I.e., the output of udevmonitor shows 
ID_PATH, and that'd be a fine key to match against. Is ID_PATH the same 
as %p? No, but then what is this ID_KEY? What line in udevmonitor's 
output matches to %id as mentioned in the man page? MAJOR and MINOR are 
easy enough, but all these others can be a real puzzle -- even though 
the information is right there in udevmonitor's output. udevinfo seems a 
lot better about showing what's sysfs{}, and that's a big help.

-- 
  Moshe Yudkowsky
  work: http://www.Disaggregate.com
  book: http://www.PebbleAndAvalanche.com


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