UdevConfiguration

From FreeBoB

In order for ordinary users to be able to use the 1394 related device drivers, such as raw1394, one needs to make sure that the permissions of these devices are correct. On modern systems, this is done by changing the configuration of udev.

(note: this might be Fedora Core specific) (Applies to: Fedora Core, RedHat) (please add others if verified)

Table of contents
1 Making sure udev recognizes the 1394 devices
2 Allow access to all users
3 Allow access to a specific group of users

3.1 Use 'disk' group
3.2 Create a new group

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Making sure udev recognizes the 1394 devices

Note: chances are that this is already done by your distribution. You can check this by running: 

$ grep -R 1394 /etc/udev/ | grep rules

if this returns lines like this: 

KERNEL="raw1394", NAME="%k"
KERNEL="dv1394*", NAME="dv1394/%n"
KERNEL="video1394*", NAME="video1394/%n"

The rules are probably set up correctly. Another way to check this is to check the presence of /dev/raw1394. If it is present, there is no need to change the rules.

Otherwise create the following file in /etc/udev/rules.d: 

40-linux1394.rules

containing: 

KERNEL="raw1394", NAME="%k"
KERNEL="dv1394*", NAME="dv1394/%n"
KERNEL="video1394*", NAME="video1394/%n"
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Allow access to all users

Create the following files in /etc/udev/ 

permissions.d/40-linux1394.permissions

containing: 

raw1394:root:root:0666
dv1394/*:root:root:0666
video1394/*:root:root:0666
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Allow access to a specific group of users

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Use 'disk' group

There are several ways in which this can be done. One way which has been suggested is allowing the 'disk' group access to raw1394.

Add the following to /etc/udev/rules.d/40-permissions.rules: 

KERNEL="raw1394", GROUP="disk"

If you are a user with substantial privileges, this should be all that is necessary. To be certain your user is a member of the 'disk' group: 

adduser your_user_name disk
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Create a new group

If you would prefer to create a new group for these privileges, create a group (choose any name you wish and substitute it for 'rawfw' in the following: 

groupadd rawfw
adduser your_user_name rawfw

Now, instead of the above GROUP="disk" in /etc/udev/rules.d/40-permissions.rules 

KERNEL="raw1394", GROUP="rawfw"

Note that following this method, any user that needs to use a freebob device will need to be added to the group that has access privileges.

Retrieved from "http://freebob.sourceforge.net/index.php/UdevConfiguration"