From mboxrd@z Thu Jan  1 00:00:00 1970
From: Moshe Yudkowsky <msha5_17@bl.com>
Date: Wed, 30 Nov 2005 22:14:45 +0000
Subject: Does RUN work with "remove" events?
Message-Id: <438E2455.5090702@bl.com>
List-Id: <linux-hotplug.vger.kernel.org>
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
To: linux-hotplug@vger.kernel.org

I've written a udev rule to add a UMS flash drive with device name /dev/ums:

SYSFS{product}="Flash Disk", NAME="ums", RUN+="/etc/hotplug/usb/ums"

I've used "product" in the hope that the rule will be more general, and 
I won't have to change it for each new USB flash drive.

I selected "Flash Drive based on the following stansa that I saw in 
udevinfo:

>   looking at the device chain at '/sys/devices/pci0000:00/0000:00:10.3/usb4/4-2':
>     BUS="usb"
>     ID="4-2"
>     DRIVER="usb"
>     SYSFS{bConfigurationValue}="1"
>     SYSFS{bDeviceClass}="00"
>     SYSFS{bDeviceProtocol}="00"
>     SYSFS{bDeviceSubClass}="00"
>     SYSFS{bMaxPower}="200mA"
>     SYSFS{bNumConfigurations}="1"
>     SYSFS{bNumInterfaces}=" 1"
>     SYSFS{bcdDevice}="0200"
>     SYSFS{bmAttributes}="80"
>     SYSFS{configuration}=""
>     SYSFS{devnum}="18"
>     SYSFS{idProduct}="2168"
>     SYSFS{idVendor}="0ea0"
>     SYSFS{manufacturer}="USB     "
>     SYSFS{maxchild}="0"
>     SYSFS{product}="Flash Disk      "
>     SYSFS{serial}="255A07F4403C2C06"
>     SYSFS{speed}="480"
>     SYSFS{version}=" 2.00"
> 


When I plug  in the flash drive, I get the expected result: the RUN 
script runs (as well as the scsi_generic script), and I get a /dev/ums 
device.

> run_program: '/etc/hotplug/usb/ums' 'block'

and

> run_program '/etc/hotplug/usb/ums' 'scsi_generic'

as well because I used RUN+= instead of RUN=.

The problem is on remove. The file /dev/hotplug.log shows that I in fact 
do get a hotplug event of "remove":

> HOTPLUG_TIME='Wed Nov 30 15:40:04 CST 2005'
> SUBSYSTEM=usb
> OLDPWD=/
> DEVPATH=/devices/pci0000:00/0000:00:10.3/usb4/4-2
> ACTION=remove
> UDEV_LOG=3
> UDEVD_EVENT=1
> PHYSDEVBUS=usb
> SEQNUM55

and I can see from udevmonitor:

> UDEV  [1133386804.167444] remove@/devices/pci0000:00/0000:00:10.3/usb4/4-2

and I get events from udev such as

> udev_event_run: seq 1277 forked, pid [4221], 'remove' 'scsi_generic', 0 seconds old


But the script in RUN never runs -- and I can see this in the udev 
output log, which I won't attach here.

So, here's the questions:

(a) Is udev supposed to work this way?
(b) If it is supposed to work this way, what's the recommended method to 
get RUN to work on ACTIONs of "remove"?
(c) If it isn't supposed to work this way, does anyone have any 
debugging suggestions or ideas of what to try next?

Regards,
  Moshe Yudkowsky
  (work) http://www.Disaggregate.com
  (book) http://www.PebbleAndAvalanche.com




-------------------------------------------------------
This SF.net email is sponsored by: Splunk Inc. Do you grep through log files
for problems?  Stop!  Download the new AJAX search engine that makes
searching your log files as easy as surfing the  web.  DOWNLOAD SPLUNK!
http://ads.osdn.com/?ad_idv37&alloc_id865&op=click
_______________________________________________
Linux-hotplug-devel mailing list  http://linux-hotplug.sourceforge.net
Linux-hotplug-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/linux-hotplug-devel