How can I set device rw permissions permanently on Raspbian?
You can do this using udev. Create a file in /etc/udev/rules.d
with the suffix .rules
, e.g. local.rules
, and add a line like this to it:
ACTION=="add", KERNEL=="i2c-[0-1]*", MODE="0666"
MODE=0666
is rw for owner, group, world. Something you can do instead of, or together with that, is to specify a GID for the node, e.g:
GROUP="pi"
If you use this instead of the MODE
setting, the default, 0660 (rw for owner and group) will apply, but the group will be pi
, so user pi
will have rw permissions. You can also specify the OWNER
the same way.
Pay attention to the difference between ==
and =
above. The former is to test if something is true, the latter sets it. Don't mix those up by forgetting a =
in ==
.
You have to reboot for this to take effect.
"Writing udev rules" Reference