[Jack-Devel] tmux, systemd and jack capture

[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.

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