[systemd-devel] no user dbus session in container

[arnaud gaboury]

 % systemctl --version
systemd 233
+PAM -AUDIT -SELINUX -IMA -APPARMOR +SMACK -SYSVINIT +UTMP +LIBCRYPTSETUP
+GCRYPT +GNUTLS +ACL +XZ +LZ4 -SECCOMP +BLKID +ELFUTILS +KMOD +IDN
default-hierarchy=hybrid

% machinectl list
MACHINE CLASS     SERVICE        OS     VERSION ADDRESSES
poppy   container systemd-nspawn fedora 26      192.168.1.94...

% machinectl show poppy
Name=poppy
Id=59b720b533834a4eafe07a62c2482266
Timestamp=Wed 2017-07-12 22:07:15 CEST
TimestampMonotonic=6928076
Service=systemd-nspawn
Unit=systemd-nspawn at poppy.service
Leader=648
Class=container
RootDirectory=/var/lib/machines/poppy
State=running

After upgrade from Fedora 25 to 26, there is no more user dbus session for
user in container.

On container:
$ ps -ef | grep dbus
5:dbus        35     1  0 Jul13 ?        00:00:00 /usr/bin/dbus-daemon
--system --address=systemd: --nofork --nopidfile --systemd-activation
--syslog-only
65:root      1195  1163  0 14:18 pts/0    00:00:00 grep -nI --color dbus

On host:
$ ps -ef | grep dbus
195:dbus       582     1  1 Jul12 ?        00:21:57 /usr/bin/dbus-daemon
--system --address=systemd: --nofork --nopidfile --systemd-activation
204:gabx       614   602  0 Jul12 ?        00:00:00 /usr/bin/dbus-daemon
--session --address=systemd: --nofork --nopidfile --systemd-activation
251:gabx      1593  1588  0 Jul12 ?        00:00:00 /usr/bin/dbus-daemon
--config-file=/usr/share/defaults/at-spi2/accessibility.conf --nofork
--print-address 3
333:vu-popp+ 16543 16502  0 22:52 ?        00:00:00 /usr/bin/dbus-daemon
--system --address=systemd: --nofork --nopidfile --systemd-activation
--syslog-only

On container, user can't connect to dbus session, and I have no idea why.
May someone please give me some hints on how to debug this issue? Thank you
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