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tojo
n00b
Joined: 09 Dec 2002
Posts: 72
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 Posted: Mon Dec 08, 2003 8:43 am Post subject: Autoloading services when plugging USB device |
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Autoloading services when plugging USB device
I have HP PSC 2110 USB printer and I want to get cups and hpoj services to be started whenever I plug the printer (or put power on). Here is how I achieved this. This is easily modified to any usb device. Pre-requirements are that you have USB correctly setup and emerged hotplug, and usb drivers compiled as modules.
Kernel loads automatically correct usb drivers whenever you plug the device, you should see this from your system log (/var/log/messages or /var/log/everything/current). For me when I plug the printer it loads "printer" driver (module).
So I write little script to file | Code: | | /etc/hotplug/usb/printer |
| Code: | #!/bin/sh
PRG1=/etc/init.d/hpoj
PRG2=/etc/init.d/cupsd
sleep 1
$PRG1 start;
sleep 1;
$PRG2 start;
echo "#!/bin/sh" > $REMOVER
echo "$PRG2 stop" >> $REMOVER
echo "$PRG1 stop" >> $REMOVER
echo "/bin/killall -q -9 ptal-printd" >> $REMOVER
echo "/bin/killall -q -9 ptal-mlcd" >> $REMOVER
echo "/sbin/rmmod printer" >> $REMOVER
chmod +x $REMOVER |
And give execution rights to script | Code: | | chmod +x /etc/hotplug/usb/printer |
And that's it!
Script creates this $REMOVER file (hotplug internal attribute) which is executed when you unplug the printer.
This also works that way if you have hotplug on your system startup (rc-update add hotplug default) this script is executed on system startup if your printer is on.
Update 9.12.2003
Guide to usb-pen/thumbdrive follow this link:
https://listman.redhat.com/archives/rhl-devel-list/2003-August/msg00115.html |
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tactless
l33t
Joined: 14 Jul 2002
Posts: 642
Location: Mitzpe Adi, Israel
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| Posted: Sat Jan 31, 2004 9:23 pm Post subject: |
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Works well, as long as the printer is not online during startup. If it is, you get depscan.sh errors and the service dependency cache goes a bit funky. Any fix for this?
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Tactless
"If it wasn't for fog, the world would run at a really crappy framerate."
Jabber: tactless@amessage.info |
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tojo
n00b
Joined: 09 Dec 2002
Posts: 72
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| Posted: Sat Jan 31, 2004 11:02 pm Post subject: |
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Not a fix, but you can start daemons directly. I'm using this script now:
| Code: | #!/bin/sh
# Wait device to come up
/bin/sleep 2
# Start necessary services
/bin/nice --adjustment=15 /usr/sbin/ptal-init start -q
/bin/nice --adjustment=15 /usr/sbin/cupsd
if [ ! -e /var/run/usb ]; then
/bin/mkdir -p /var/run/usb
fi
# Create remover file
echo \
"#!/bin/sh
/bin/killall -q -9 cupsd
/usr/sbin/ptal-init stop -q
/bin/killall -q -9 ptal-printd
/bin/killall -q -9 ptal-mlcd
/bin/sleep 2
/sbin/rmmod usblp
/sbin/rmmod printer
" > $REMOVER
if [ ! -e $REMOVER ]; then
echo $REMOVER > /tmp/usblp.remover
fi
# Give execute rights to remover
/bin/chmod 0755 $REMOVER |
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tactless
l33t
Joined: 14 Jul 2002
Posts: 642
Location: Mitzpe Adi, Israel
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| Posted: Sun Feb 01, 2004 2:26 pm Post subject: |
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Come on, that can't possibly be the right way to do it...
Isn't there any way to get around the depscan issue?
_________________
Tactless
"If it wasn't for fog, the world would run at a really crappy framerate."
Jabber: tactless@amessage.info |
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tactless
l33t
Joined: 14 Jul 2002
Posts: 642
Location: Mitzpe Adi, Israel
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| Posted: Sun Feb 01, 2004 4:03 pm Post subject: |
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Cleaned up a bit (killall cupsd is ugly, and one should wait before killing the ptal scripts)
| Code: |
#!/bin/sh
/bin/sleep 2
/bin/nice --adjustment=15 /usr/sbin/ptal-init start -q
start-stop-daemon --start --quiet --exec /usr/sbin/cupsd
if [ ! -e /var/run/usb ]; then
/bin/mkdir -p /var/run/usb
fi
echo \
"#!/bin/sh
start-stop-daemon --stop --quiet --exec /usr/sbin/cupsd
/usr/sbin/ptal-init stop -q
/bin/sleep 2
/bin/killall -q ptal-printd
/bin/killall -q ptal-mlcd
/sbin/rmmod usblp
" > $REMOVER
if [ ! -e $REMOVER ]; then
echo $REMOVER > /tmp/usblp.remover
fi
/bin/chmod 0755 $REMOVER
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_________________
Tactless
"If it wasn't for fog, the world would run at a really crappy framerate."
Jabber: tactless@amessage.info |
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