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gentsquash
l33t
Joined: 03 Nov 2004
Posts: 753
Location: Still a Gentoo beginner.
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 Posted: Fri May 26, 2006 8:19 pm Post subject: Auto-notification of USB-device (dis)connect |
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Connecting or disconnecting a USB device causes a message
to appear in /var/log/messages.
Is there a simple way to have a pop-up appear, announcing the
(dis)connection? E.g, an call to the wall cmd or to usbview.
A somewhat clumsy solution is
| Code: | | watch --differences=cumulative 'tail /var/log/messages' |
I realize that there may exist complex notification
software for all kinds of events; I seek something just for
knowing if there is an electrical connection.
E.g, I shift some cables in order to catch my son's gerbil
that has just escaped, and without realizing it I
disconnect a USB device.
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Prof. Jonathan LF King, Mathematics dept., University of Florida |
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Headrush
Watchman
Joined: 06 Nov 2003
Posts: 5597
Location: Bizarro World
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| Posted: Sat May 27, 2006 1:10 am Post subject: |
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Check out /etc/hotplug/usb.agent.
Depending on your exact need, you can easily modify the action for an add or a delete event to popup a message or whatever you want to happen.
Be careful in that when you update hotplug your changes will be replaced. (So make a backup.) |
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gentsquash
l33t
Joined: 03 Nov 2004
Posts: 753
Location: Still a Gentoo beginner.
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| Posted: Sun May 28, 2006 9:09 pm Post subject: |
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Thank you, Headrush.
I read /etc/hotplug/usb.agent with interest, but I
understood little of it. With "usb.agent" as a keyword, a
websearch give this page,
http://lwn.net/Articles/123932/
which has
| Code: | ... So, for example, if you want to be notified of all USB
hotplug events, put a symlink to your program in the
/etc/hotplug.d/usb/ directory that ends in .hotplug . A
typical /etc/hotplug.d tree one of my Gentoo-based systems
looks like the following:
/etc/hotplug.d/
`-- default
|-- 10-udev.hotplug -> ../../../sbin/udevsend
|-- 20-hal.hotplug -> /usr/libexec/hal.hotplug
`-- default.hotplug
This arrangement means that udevsend is called first for
any hotplug event, followed by HAL, and then finally, the
default linux-hotplug scripts. ...
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As an experiment, I created a directory "usb" in
/etc/hotplug.d/ into which I placed a symlink
| Code: | /etc/hotplug.d/usb:
17-usbview.hotplug -> /usr/bin/usbview |
I then plugged-in and removed several usb devices, but
usbview did not pop up.
(I did not, however, restart the system; is there a usb
equivalent of the rehash cmd?)
Could some kind soul post an example of how a user defines
a usb-triggered action?
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Prof. Jonathan LF King, Mathematics dept., University of Florida |
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Headrush
Watchman
Joined: 06 Nov 2003
Posts: 5597
Location: Bizarro World
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| Posted: Sun May 28, 2006 9:36 pm Post subject: |
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Does usbview use the X server?
Remember, this is run as root, and by default in Gentoo root doesn't have X permissions.
Just test by dumping a message into the main log file. eg [b/]cat "See it works" >> /var/log/messages[/b]
Edit: I tested this and it works. |
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gentsquash
l33t
Joined: 03 Nov 2004
Posts: 753
Location: Still a Gentoo beginner.
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| Posted: Mon May 29, 2006 4:24 am Post subject: |
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| Headrush wrote: | Does usbview use the X server?
Remember, this is run as root, and by default in Gentoo
root doesn't have X permissions. |
A very good point. Following your lead, I put a script in
/etc/hotplug.d/usb/ that calls wall --and it worked. But...
Curiouser and curiouser, as Alice in Linuxland said. From the
cmd-line in a root shell I can run usbview, or as a subshell
and the usbview window appears. I did indeed check, in this
root shell, that $HOME points to the home dir of my user, not
that of root, and that ~root/.Xauthority has no cookie (it
exists, but is empty).
However, if I put usbview in the above script, and run it
from my root or my user's shell, no usbview-window
appears. Could this be related to the distinction between
interactive and non-interactive shells?
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