[Sugar-devel] Permission problems and acessing usb dispositive

[Emiliano Pastorino]

Alberto,

You could write a udev rule like this:

cat > /etc/udev/rules.d/99-ttyACM.rules << EOF
KERNEL=="ttyACM[0-9]",MODE="0666"
EOF

This will set rw access to ttyACM devices for everyone.
If you think that's too permissive, you could do something like:

cat > /etc/udev/rules.d/99-ttyACM.rules << EOF
SYSFS{idVendor}=="vendor_id",SYSFS{idProduct}=="product_id",KERNEL=="ttyACM[0-9]",MODE="0666"
EOF

Again, this will set rw permissions for everyone, but only to ttyACM devices
specified by its vendor and product id. I.e, for Texas Instruments
USB-serial converter, idVendor=="0451" and idProduct=="3410".

You'll have to do this on every laptop, but only once.

I'm curious about the platform you're using... is it LEGO Mindstorms or
maybe Arduino? Anyway... which aplication have you adapted for the XO?
We're working on some piltos in Uruguay for which we bought a bunch of
those, but haven't arrived yet. I think it would be very productive for our
deployments if we keep in touch. Which one are you working on?

Cheers,
Emiliano


On Wed, Jun 23, 2010 at 11:03 AM, Martin Langhoff <martin.langhoff at gmail.com
> wrote:

> On Wed, Jun 23, 2010 at 8:03 AM, Alberto Arruda de Oliveira
> <alberto.a.oliv at gmail.com> wrote:
> > But now, I'm facing another problem regarding the permissions olpc user
> has
> > to access diferent dispositives on XO.
>
> It sounds like very interesting software! The problem you are facing
> is normally resolved by adding a bit of "policy" for a tool called
> "PolicyKit".
>
> I am not an expert on PolicyKit at all -- so I don't know what the
> exact answer is. Hopefully someone who knows & understands PK can
> help!
>
> cheers,
>
>
>
> m
> --
>  martin.langhoff at gmail.com
>  martin at laptop.org -- School Server Architect
>  - ask interesting questions
>  - don't get distracted with shiny stuff  - working code first
>  - http://wiki.laptop.org/go/User:Martinlanghoff
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