bind-dirs not persisting to dvm

[Qubes]

I created a new appVM, firefox-test-dvm, that I am using to create my
own disposable VM with a customized Firefox profile that runs with PSD
(Profile Sync Daemon). I have FF running in other appVMs with PSD
already so I decided I will add it to a dvm. FF quickly slows down once
you run into 50+ active tabs that have content loaded, which is easy.

To problem with running that many tabs in FF running on PSD is that
tmpfs (/run/user/1000) is too small. The appVM I am using for my dvm has
400 MB set for its "Initial memory". Default behavior is tmpfs is
allocated 10% of the appVMs "Initial memory" setting. So there are two
ways of increasing the size of tmpfs, either increase the "Initial
memory" to e.g. 800 MB or change the default 10% to 20/30/40%.

I have chosen to increase the size of tmpfs by changing the default 10%
to 40%. This handles many tabs in FF without any issues and I am not
negatively impacted by over budgeting tmpfs since the real impact is
only consumed memory. 40% is only the maximum it may consume.


tmpfs at the default 10%

user@firefox-test-dvm:~$ df -h
Filesystem Size Used Avail Use% Mounted on
tmpfs 35M 12K 35M 1% /run/user/1000 <---- default


To change the default and increase the size of tmpfs to 40% you need to
edit /etc/systemd/logind.conf but since this is an appVM these changes
will be lost after reboot so I bind the file, create it, and change it
to 40%

sudo mkdir -p /rw/config/qubes-bind-dirs.d
sudo vi /rw/config/qubes-bind-dirs.d/50_user.conf
* binds+=( '/etc/systemd/logind.conf' )

sudo mkdir /rw/bind-dirs/etc
sudo mkdir /rw/bind-dirs/etc/systemd
sudo cp /etc/systemd/logind.conf /rw/bind-dirs/etc/systemd/
sudo vi /rw/bind-dirs/etc/systemd/logind.conf
* change RuntimeDirectorySize=40% <---- default customized to 40%

Reboot VM.

user@firefox-test-dvm:~$ df -h
Filesystem Size Used Avail Use% Mounted on
tmpfs 138M 12K 138M 1% /run/user/1000 <---- now visible


Voila tmpfs increased. After shutting down the VM I change it to a
"Disposable VM Template" in Qube Settings.


*******************************************************************************
********************** This is where the problem starts
***********************
*******************************************************************************


If I start for example Krusader using the above created dvm template I
wait until Krusader opens then click on the blue Q in the tray area and
then open a terminal for disp4911. The output shows that the
customization from above is kept in disp4911, as I expected, but, tmpfs
is the same size as when the default 10% is used. I do not understand
that, can someone please help cast some light on this?


user@disp4911:~$ cat /rw/config/qubes-bind-dirs.d/50_user.conf
binds+=( '/etc/systemd/logind.conf' )

user@disp4911:~$ cat /rw/bind-dirs/etc/systemd/logind.conf
# This file is part of systemd.
#
# systemd is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2.1 of the License, or
# (at your option) any later version.
#
# Entries in this file show the compile time defaults.
# You can change settings by editing this file.
# Defaults can be restored by simply deleting this file.
#
# See logind.conf(5) for details.

[Login]
#NAutoVTs=6
#ReserveVT=6
#KillUserProcesses=no
#KillOnlyUsers=
#KillExcludeUsers=root
#InhibitDelayMaxSec=5
#HandlePowerKey=poweroff
#HandleSuspendKey=suspend
#HandleHibernateKey=hibernate
#HandleLidSwitch=suspend
#HandleLidSwitchExternalPower=suspend
#HandleLidSwitchDocked=ignore
#PowerKeyIgnoreInhibited=no
#SuspendKeyIgnoreInhibited=no
#HibernateKeyIgnoreInhibited=no
#LidSwitchIgnoreInhibited=yes
#HoldoffTimeoutSec=30s
#IdleAction=ignore
#IdleActionSec=30min
RuntimeDirectorySize=40%
#RemoveIPC=yes
#InhibitorsMax=8192
#SessionsMax=8192


At 40% the dvm should have 138M of tmpfs space.

user@disp4911:~$ df -h
Filesystem Size Used Avail Use% Mounted on
tmpfs 35M 12K 35M 1% /run/user/1000