[Jack-Devel] tmux, systemd and jack capture

[jack at microfx.de]

Am 2019-04-26 05:35, schrieb Hermann Meyer:
> Am 26.04.19 um 01:09 schrieb jack at microfx.de:
>> Hey Thomas!
>> 
>> Thanks a lot for your input! You are totally right, I could have
>> checked this myself. Works like a charm with screen. So I suppose I'll
>> go with that solution - fantastic - also your script is very helpful!
>> Kudos!
>> 
>> Cheers
>> Jan
>> 
>> 
>> Am 2019-04-25 15:41, schrieb Thomas Brand:
>>> On 2019-04-25 12:39, jack at microfx.de wrote:
>>>> Hey Thomas,
>>>> 
>>>> systemctl --version
>>>> systemd 232
>>>> +PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP
>>>> +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ +LZ4 +SECCOMP +BLKID 
>>>> +ELFUTILS
>>>> +KMOD +IDN
>>>> 
>>>> From that issue thread I see it's only in 240 - so this is not the
>>>> problem I suppose.
>>>> 
>>>> Cheers
>>>> Jan
>>>> 
>>>> 
>>>> Am 2019-04-25 12:33, schrieb Thomas Brand:
>>>>> On 2019-04-25 11:35, jack at microfx.de wrote:
>>>>>> Hey!
>>>>>> 
>>>>>> I have a hard time setting up a tmux session started with systemd 
>>>>>> on
>>>>>> raspbian (patchbox OS, realtime kernel) to behaves like as if I
>>>>>> started my script manually.
>>>>> 
>>>>>> Cannot use real-time scheduling (RR/70)(1: Operation not 
>>>>>> permitted)
>>>>>> JackClient::AcquireSelfRealTime error
>>>>> 
>>>>>> 
>>> 
>>> It's yet unclear to me if this is related to jack at all.. Can you
>>> test this without jack? Basically leaving everything out except a
>>> script started by systemd that tries to lock memory or calls ulimit.
>>> 
>>> Similar to your tmux approach, with screen, here's a building block:
>>> 
>>> #!/bin/bash
>>> 
>>> start_in_detached_screen()
>>> {
>>>         #$1: username
>>>         #$2: screen name
>>>         #$3: command string (without ^M)
>>> 
>>>         su ${1} -c "screen -d -m -S \"$2\""
>>>         su ${1} -c "screen -S \"$2\" -p 0 -X stuff \"$3\"^M"
>>> }
>>> 
>>> start_in_detached_screen john_doe "my test" "cd /tmp && ls -ltra"
>>> 
>>> -> as root: start screen as given user and feed command to screen
>>> session.
>>> It should work to start jackd as a specific user early in the boot
>>> process and see what happened by attaching the screen later on.
>>> 
>>> Greetings
>>> Thomas
>> 
> 
> If it is a Users permission issue, you could do it with systemd by 
> using
> the XDG_RUNTIME_DIR var.
> 
> 
> [Service]
> 
> User=USERNAME
> 
> Type=oneshot
> 
> Environment="XDG_RUNTIME_DIR=/run/user/USERID"
> 
> ExecStart=/home/patch/jack-capture-tmux.sh
> 
> 
> were you need to set your username and id (id -u $(logname))
> 
> this will start the script with the permissions set for the user.


Thank you big time too! This indeed fixed the problem - I also had to 
add /bin/bash before the bash script. Really appreciated! Have a nice 
weekend!