udev rule matching using ENV

udev rule matching using ENV

[william]

Dear list

i am trying to create a udev rule which executes a script whenever a usb 
stick is removed with a particular uuid

The uuid is changeable and we have a common settings file which exports 
the UUID from the usb partition.

What i would like is to import the UUID from the settings file and match 
that with the actual ID_FS_UUID with the remove action.

So i created 99-remove-usb.rules with the following contents

IMPORT{program}="/usr/local/bin/usb-stick-uuid.sh"
ACTION="remove", ENV{ID_FS_UUID}="ENV{MY_UUID}", 
RUN+="/usr/local/bin/usb-removed.sh"

The program usb-stick-uuid.sh now only echo's:
MY_UUIDÿ744c66-3671-447c-8fa0-d96fc6f82352
and nothing else.
But it does never match.

When i enter the uuid by hand in the rule it does work:
ACTION="remove", 
ENV{ID_FS_UUID}="ff744c66-3671-447c-8fa0-d96fc6f82352", 
RUN+="/usr/local/bin/usb-removed.sh"

Am i doing something wrong or is it just the way it works? I also could 
not find any example on the internet matching two ENV strings.

My system:
ubuntu 10.10
udev version 162

udev rule matching using ENV

[william]

Dear list

i am trying to create a udev rule which executes a script whenever a usb 
stick is removed with a particular uuid

The uuid is changeable and we have a common settings file which exports 
the UUID from the usb partition.

What i would like is to import the UUID from the settings file and match 
that with the actual ID_FS_UUID with the remove action.

So i created 99-remove-usb.rules with the following contents

IMPORT{program}="/usr/local/bin/usb-stick-uuid.sh"
ACTION="remove", ENV{ID_FS_UUID}="ENV{MY_UUID}", 
RUN+="/usr/local/bin/usb-removed.sh"

The program usb-stick-uuid.sh now only echo's:
MY_UUIDÿ744c66-3671-447c-8fa0-d96fc6f82352
and nothing else.
But it does never match.

When i enter the uuid by hand in the rule it does work:
ACTION="remove", 
ENV{ID_FS_UUID}="ff744c66-3671-447c-8fa0-d96fc6f82352", 
RUN+="/usr/local/bin/usb-removed.sh"

Am i doing something wrong or is it just the way it works? I also could 
not find any example on the internet matching two ENV strings.

My system:
ubuntu 10.10
udev version 162

With kind regards

William

Re: udev rule matching using ENV

[Kay Sievers]

On Tue, Jul 26, 2011 at 21:18, william <kc@cobradevil.org> wrote:
> i am trying to create a udev rule which executes a script whenever a usb
> stick is removed with a particular uuid
>
> So i created 99-remove-usb.rules with the following contents
>
> IMPORT{program}="/usr/local/bin/usb-stick-uuid.sh"
> ACTION="remove", ENV{ID_FS_UUID}="ENV{MY_UUID}",

> But it does never match.

ENV{ID_FS_UUID}="$env{MY_UUID}" ?

Kay

Re: udev rule matching using ENV

[william]

On 07/26/2011 10:35 PM, Kay Sievers wrote:
> On Tue, Jul 26, 2011 at 21:18, william<kc@cobradevil.org>  wrote:
>> i am trying to create a udev rule which executes a script whenever a usb
>> stick is removed with a particular uuid
>>
>> So i created 99-remove-usb.rules with the following contents
>>
>> IMPORT{program}="/usr/local/bin/usb-stick-uuid.sh"
>> ACTION="remove", ENV{ID_FS_UUID}="ENV{MY_UUID}",
>> But it does never match.
> ENV{ID_FS_UUID}="$env{MY_UUID}" ?
>
no match with the $env{MY_UUID}

When i remove this match so it will execute the script i do get the 
MY_UUID in the environment so i know it gets filled.
Also visible when using:
udevadm test --action=remove /block/sdb


William
> Kay
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