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Description of problem:
Currently if we set a default session for System user (root), it is not reflected after reboot.
The /var/lib/AccountsService/users/root gets updated every time accounts-daemon restarts.

Version-Release number of selected component (if applicable):
Red Hat Enterprise Linux 7.6
accountsservice-0.6.50-4.el7.1.x86_64

How reproducible:
Always

Steps to Reproduce:
1. Setup a custom session for root user.
2. Select it from login screen. OR
Run,
# gdbus call --system --dest org.freedesktop.Accounts --object-path /org/freedesktop/Accounts/User0 --method org.freedesktop.Accounts.User.SetXSession "kiosk"
from multi-user.target
"kiosk" is the custom session defined.
/usr/share/xsessions/kiosk.desktop

Actual results:
# cat /var/lib/AccountsService/users/root 
[User]
Language=
XSession=
Icon=/root/.face
SystemAccount=true


Expected results:
# cat /var/lib/AccountsService/users/root 
[User]
Language=
XSession=kiosk
Icon=/root/.face
SystemAccount=true


Additional info:

Upstream BZ : https://gitlab.freedesktop.org/accountsservice/accountsservice/merge_requests/32

Unable to reproduce with accountsservice-0.6.50-6

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2020:1021