bind-dirs configuration not persisting to dvm

[Qubes]

I have an appVM that I changed into a dvm template, but I need to
increase the size of tmpfs /run/user/1000 from the default 10% of memory
size to e.g. 40% when an application in the dvm is opened (and the
dispxxxx gets created).

To do this I edited /etc/systemd/logind.conf in the appVM and changed
RuntimeDirectorySize=40%.

To make this stick between reboots, I used bind-dirs.

If I reboot the appVM and look at 'df -h' and 'cat
/etc/systemd/logind.conf' I can see that my changes have persisted.

The problem is after I change my appVM into a dvm template, 'qvm-prefs
<vmname> template_for_dispvms True' in my dvm 'tmpfs /run/user/1000' is
at default 10%, 'df -h' confirms. And my customization to
'/etc/systemd/logind.conf' is not there.

However, 'cat /rw/bind-dirs/etc/systemd/logind.conf' still shows

user@disp9640:~$ cat /rw/bind-dirs/etc/systemd/logind.conf
RuntimeDirectorySize=40%

Is that a bug or does that have something to do with how and when
'/rw/config/qubes-bind-dirs.d/50_user.conf' is parsed? because this is
where '/etc/systemd/logind.conf' is binded.

[awokd]

Qubes:

To simplify the problem a bit, maybe use a different template for your
dvm template and edit /etc/systemd/logind.conf directly in the base
template?

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[Qubes]

On 8/20/20 9:06 AM, 'awokd' via qubes-users wrote:
> Qubes:
>> I have an appVM that I changed into a dvm template, but I need to
>> increase the size of tmpfs /run/user/1000 from the default 10% of memory
>> size to e.g. 40% when an application in the dvm is opened (and the
>> dispxxxx gets created).
>>
>> To do this I edited /etc/systemd/logind.conf in the appVM and changed
>> RuntimeDirectorySize=40%.
>>
>> To make this stick between reboots, I used bind-dirs.
>>
>> If I reboot the appVM and look at 'df -h' and 'cat
>> /etc/systemd/logind.conf' I can see that my changes have persisted.
>>
>> The problem is after I change my appVM into a dvm template, 'qvm-prefs
>> <vmname> template_for_dispvms True' in my dvm 'tmpfs /run/user/1000' is
>> at default 10%, 'df -h' confirms. And my customization to
>> '/etc/systemd/logind.conf' is not there.
>>
>> However, 'cat /rw/bind-dirs/etc/systemd/logind.conf' still shows
>>
>> user@disp9640:~$ cat /rw/bind-dirs/etc/systemd/logind.conf
>> RuntimeDirectorySize=40%
>>
>> Is that a bug or does that have something to do with how and when
>> '/rw/config/qubes-bind-dirs.d/50_user.conf' is parsed? because this is
>> where '/etc/systemd/logind.conf' is binded.
>>
> To simplify the problem a bit, maybe use a different template for your
> dvm template and edit /etc/systemd/logind.conf directly in the base
> template?
>

That works. It also works in the appVM before I set it to be a dvm, but
it does not address the root cause. The issue described is only
applicable to dvm's, but I have not found any documentation or anywhere
else online for that matter indicating that bind-dirs are not compatible
with dvm's. AFAIK it should work in the dvm exactly as it does in the appVM.