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biergaizi
n00b
Joined: 18 Dec 2011
Posts: 29
Location: Beijing, China
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 Posted: Mon Oct 01, 2012 4:16 am Post subject: [resolved] Udev rule is not working! |
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I write a udev rule, but it's not working!
More information are avaliable here:
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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
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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
Watchman
Joined: 14 Jul 2005
Posts: 7043
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| Posted: Mon Oct 01, 2012 9:26 am Post subject: Re: Udev rule is not working! |
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| 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
n00b
Joined: 18 Dec 2011
Posts: 29
Location: Beijing, China
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| Posted: Mon Oct 01, 2012 2:39 pm Post subject: Re: Udev rule is not working! |
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| 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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Keep It Simple, Stupid. |
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biergaizi
n00b
Joined: 18 Dec 2011
Posts: 29
Location: Beijing, China
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| Posted: Wed Oct 03, 2012 3:45 am Post subject: |
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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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Keep It Simple, Stupid. |
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Kernel & Hardware
