[juneau-lug] Re: losing permissions

  • From: Jamie <jamie@xxxxxxxxxxxxxxxxx>
  • To: juneau-lug@xxxxxxxxxxxxx
  • Date: Thu, 27 Feb 2014 15:26:02 -0900

Thanks for the tip James.   The first run had the lines:
> parse_file: reading 
> '/etc/udev/rules.d/91-persistent-weather-usb.rules' as rules file
> add_rule: invalid KERNEL operation
> add_rule: invalid rule 
> '/etc/udev/rules.d/91-persistent-weather-usb.rules:14'
> parse_file: reading 
> '/lib/udev/rules.d/95-keyboard-force-release.rules' as rules file
and I noticed an example rule used double equal signs so I changed my 
rule to:
KERNEL=="ttyUSB[0-9]*", GROUP=="dialout", MODE=="0666", ENV{GENERATED}=="1"
and tried again.  Eliminating that error:
> parse_file: reading 
> '/etc/udev/rules.d/91-persistent-weather-usb.rules' as rules file
> parse_file: reading 
> '/lib/udev/rules.d/95-keyboard-force-release.rules' as rules file
but still not setting my permissions.  Can you help me interpret this 
(from the udevadm test):
> udev_event_execute_rules: no node name set, will use kernel supplied 
> name 'ttyUSB0'
> udev_node_add: creating device node '/dev/ttyUSB0', devnum=188:0, 
> mode=0660, uid=0, gid=20
> udev_node_mknod: preserve file '/dev/ttyUSB0', because it has correct 
> dev_t
> udev_node_mknod: preserve permissions /dev/ttyUSB0, 020660, uid=0, gid=20
> node_symlink: preserve already existing symlink '/dev/char/188:0' to 
> '../ttyUSB0'
This seemed to be the pertinent part, but there's lots more - I just 
don't know what I'm looking for.  Or how to write a udev rule.  BTW this 
machine is running Ubuntu 12.04.04 LTS server.



On 02/27/2014 11:56 AM, James Zuelow wrote:
> You say that is a brand new udev rule?  It looks like it should take priority 
> as long as it is the last one run on the USB ttys and "lastrule" was not 
> included in an earlier rule.
>
> You can test your udev rules.
>
> I don't have a USBtty0 on my machine, but here is an example for you to 
> follow:
>
> udevadm info --query=path --name=/dev/ttyUSB0
>
> (udev will return a string similar to this)
> /devices/virtual/tty/ttyUSB0
>
> (put the string that udevadm returned above at the end of this command):
> udevadm test /devices/virtual/tty/ttyUSB0
>
> At the bottom of the test output should be a list of rules that udev is 
> applying, and should give you a clue to which settings are being overridden 
> or just not applying.
>
> James
>
>
>
>
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