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[resolved] Udev rule is not working!
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biergaizi
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Joined: 18 Dec 2011
Posts: 41
Location: Beijing, China

PostPosted: Mon Oct 01, 2012 4:16 am    Post subject: [resolved] Udev rule is not working! Reply with quote

I write a udev rule, but it's not working!

More information are avaliable here:
Code:

localhost biergaizi # cat /etc/udev/rules.d/91-change-schduler.rules
#SUBSYSTEMS=="usb", KERNEL=="sd??", ACTION=="add", RUN+="echo deadline > /sys/block/%k/queue/scheduler"
ACTION=="add", KERNEL=="sd??", RUN+="/usr/local/bin/USB"

localhost biergaizi # cat /usr/local/bin/USB
#!/bin/bash
echo 'Hello World!' >>"/home/biergaizi/udev.out"
exit

localhost biergaizi # ls -l /usr/local/bin/USB
-rwxr-xr-x 1 root root 66 10月  1 11:55 /usr/local/bin/USB


Why?
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Last edited by biergaizi on Wed Oct 03, 2012 3:46 am; edited 1 time in total
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PaulBredbury
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PostPosted: Mon Oct 01, 2012 9:26 am    Post subject: Re: Udev rule is not working! Reply with quote

biergaizi wrote:
ACTION=="add", KERNEL=="sd??"

Maybe that runs *before* the partition is mounted read/write?

For kicks, try adding e.g. "sleep 10" to the start of your BASH script.
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biergaizi
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Joined: 18 Dec 2011
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Location: Beijing, China

PostPosted: Mon Oct 01, 2012 2:39 pm    Post subject: Re: Udev rule is not working! Reply with quote

PaulBredbury wrote:
biergaizi wrote:
ACTION=="add", KERNEL=="sd??"

Maybe that runs *before* the partition is mounted read/write?

For kicks, try adding e.g. "sleep 10" to the start of your BASH script.


Please read my script carefully.
This script & udev rule is trying to write a file to my home folder (on my local hard drive), when a USB device is plugin.
Nothing to do with ro/rw.
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biergaizi
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Joined: 18 Dec 2011
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Location: Beijing, China

PostPosted: Wed Oct 03, 2012 3:45 am    Post subject: Reply with quote

This is my own mistake.

KERNEL=="sd??" matches to the device with a partition table (/dev/sda1) only. If your device doesn't have a partition table (/dev/sda), the rule isn't working.

You can change your rule to KERNEL=="sd?" to detect all kind of device.
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