Systemd unit file: Can/Should ExecStart and ExecStop run a script?

[Richard Shaw]

On Wed, Oct 19, 2011 at 4:27 PM, Kay Sievers <kay.sievers at vrfy.org> wrote:
> On Wed, Oct 19, 2011 at 23:20, Richard Shaw <hobbes1069 at gmail.com> wrote:
>> On Wed, Oct 19, 2011 at 3:58 PM, Tom Hughes <tom at compton.nu> wrote:
>>> On 19/10/11 21:48, Richard Shaw wrote:
>>>>
>>>> On Wed, Oct 19, 2011 at 3:26 PM, Lennart Poettering
>>>> <mzerqung at 0pointer.de>  wrote:
>>>>>
>>>>> You should manage acess control of device nodes from udev rules. That's
>>>>> the only reasonably safe way to handle these things. And this should not
>>>>> be mentioned at all in systemd unit files.
>>
>> Ok based on Tom's file I came up with the following. I know Lennart,
>> you don't like setting ACL's from Systemd, but unless someone want's
>> to help me write udev rules that will run before the start of
>> mythbackend and after it's stopped, this is all I have:
>
> Yeah, that looks very wrong.
>
> Like mentioned earlier in this thread, just put the user into the
> audio/video system group and forget about any permissions management.

That works for me. I wonder if I could use ExecStartPre to run a shell
script to make sure the user is in those groups and write to stderr if
not?

Also, the shell expansion doesn't work on ExecStart, so how to I set
the user in the command line?


Thanks,
Richard