action does not trigger on remove, only on add

action does not trigger on remove, only on add

[Moshe Yudkowsky]

I must be missing something quite obvious.

Here are two rules:

SUBSYSTEM="block", ACTION="add", SYSFS{vendor}="iriver", 
SYMLINK="iriver", RUN+="/etc/hotplug/usb/iriver"

SUBSYSTEM="block", ACTION="remove", SYSFS{vendor}="iriver", 
RUN+="/etc/hotplug/usb/iriver"

The first one works quite nicely, and I can see the program in RUN 
execute. The second rule does not run the program as far as I can tell.

I do see the "remove" event:

UDEV  [1143466033.007580] remove@/block/sdc
UDEV_LOG=3
ACTION=remove
DEVPATH=/block/sdc
SUBSYSTEM=block
SEQNUM$91
MINOR2
MAJOR=8
PHYSDEVPATH=/devices/pci0000:00/0000:00:10.3/usb4/4-4/4-4:1.0/host11/target11:0:0/11:0:0:0
PHYSDEVBUS=scsi
PHYSDEVDRIVER=sd
UDEVD_EVENT=1
DEVLINKS=/dev/iriver /dev/sdc /dev/discs/disc2/disc 
/dev/disk/by-id/usb-iriver_MassStorage_Disc 
/dev/disk/by-path/usb-iRiverLimited-IFP-700HIGHSPEED:0:0:0
DEVNAME=/dev/scsi/host11/bus0/target0/lun0/disc
ID_VENDOR=iriver
ID_MODEL=MassStorage_Disc
ID_REVISION\001
ID_SERIAL=iriver_MassStorage_Disc
ID_TYPE=disk
ID_BUS=usb
ID_PATH=usb-iRiverLimited-IFP-700HIGHSPEED:0:0:0

so I can't quite figure out why the program doesn't execute. This worked 
in the past but stopped working a few releases back, and now it's 
starting to bother me.

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


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

[Kay Sievers]

On Tue, Mar 28, 2006 at 12:00:41PM -0600, Moshe Yudkowsky wrote:
> I must be missing something quite obvious.
> 
> Here are two rules:
> 
> SUBSYSTEM="block", ACTION="add", SYSFS{vendor}="iriver", 
> SYMLINK="iriver", RUN+="/etc/hotplug/usb/iriver"
> 
> SUBSYSTEM="block", ACTION="remove", SYSFS{vendor}="iriver", 
> RUN+="/etc/hotplug/usb/iriver"
> 
> The first one works quite nicely, and I can see the program in RUN 
> execute. The second rule does not run the program as far as I can tell.
> 
> I do see the "remove" event:
> 
> UDEV  [1143466033.007580] remove@/block/sdc
> UDEV_LOG=3
> ACTION=remove
> DEVPATH=/block/sdc
> SUBSYSTEM=block
> SEQNUM$91
> MINOR2
> MAJOR=8
> PHYSDEVPATH=/devices/pci0000:00/0000:00:10.3/usb4/4-4/4-4:1.0/host11/target11:0:0/11:0:0:0
> PHYSDEVBUS=scsi
> PHYSDEVDRIVER=sd
> UDEVD_EVENT=1
> DEVLINKS=/dev/iriver /dev/sdc /dev/discs/disc2/disc 
> /dev/disk/by-id/usb-iriver_MassStorage_Disc 
> /dev/disk/by-path/usb-iRiverLimited-IFP-700HIGHSPEED:0:0:0
> DEVNAME=/dev/scsi/host11/bus0/target0/lun0/disc
> ID_VENDOR=iriver
> ID_MODEL=MassStorage_Disc
> ID_REVISION\001
> ID_SERIAL=iriver_MassStorage_Disc
> ID_TYPE=disk
> ID_BUS=usb
> ID_PATH=usb-iRiverLimited-IFP-700HIGHSPEED:0:0:0
> 
> so I can't quite figure out why the program doesn't execute. This worked 
> in the past but stopped working a few releases back, and now it's 
> starting to bother me.

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

Kay


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

[Moshe Yudkowsky]

> 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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