Run systemd-socket-proxyd as a D-Bus proxy

archlinux.dockerfile

@@ -13,6 +13,10 @@ RUN systemctl enable xvfb@:99.service && \
     useradd -m -U -G users,adm gnomeshell && \
     mkdir -p /var/lib/systemd/linger && \
     touch /var/lib/systemd/linger/gnomeshell && \
+    su -l gnomeshell -c ' \
+        mkdir -p $HOME/.config/systemd/user/sockets.target.wants/ && \
+        ln -s /etc/xdg/systemd/user/[email protected] $HOME/.config/systemd/user/sockets.target.wants/[email protected] \
+    ' && \
     systemd-machine-id-setup
 
 # dbus port

common/etc/dbus-1/session.d/tcp.conf → common/etc/dbus-1/session.d/anonymous.conf

@@ -1,7 +1,6 @@
 <!DOCTYPE busconfig PUBLIC "-//freedesktop//DTD D-Bus Bus Configuration 1.0//EN"
  "http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">
 <busconfig>
-    <listen>tcp:host=0.0.0.0,port=1234</listen>
     <listen>systemd:</listen>
     <apparmor mode="disabled"/>
     <auth>ANONYMOUS</auth>

common/etc/systemd/user/dbus-proxy@.service

@@ -0,0 +1,10 @@
+[Unit]
+Description=D-Bus TCP proxy on port %I
+Requires=dbus.socket
+After=dbus.socket
+Requires=dbus-proxy@%i.socket
+After=dbus-proxy@%i.socket
+
+[Service]
+Type=notify
+ExecStart=/lib/systemd/systemd-socket-proxyd %t/bus

common/etc/systemd/user/dbus-proxy@.socket

@@ -0,0 +1,8 @@
+[Unit]
+Description=D-Bus TCP proxy on port %I
+
+[Socket]
+ListenStream=%I
+
+[Install]
+WantedBy=sockets.target

debian.dockerfile

@@ -23,7 +23,11 @@ RUN systemctl enable xvfb@:99.service && \
     systemctl mask systemd-oomd low-memory-monitor rtkit-daemon udisks2 && \
     useradd -m -U -G users,adm gnomeshell && \
     mkdir -p /var/lib/systemd/linger && \
-    touch /var/lib/systemd/linger/gnomeshell
+    touch /var/lib/systemd/linger/gnomeshell && \
+    su -l gnomeshell -c ' \
+        mkdir -p $HOME/.config/systemd/user/sockets.target.wants/ && \
+        ln -s /etc/xdg/systemd/user/[email protected] $HOME/.config/systemd/user/sockets.target.wants/[email protected] \
+    '
 
 # dbus port
 EXPOSE 1234

fedora.dockerfile

@@ -24,7 +24,11 @@ RUN systemctl enable xvfb@:99.service && \
     systemctl --global mask org.gnome.SettingsDaemon.Subscription && \
     adduser -m -U -G users,adm gnomeshell && \
     mkdir -p /var/lib/systemd/linger && \
-    touch /var/lib/systemd/linger/gnomeshell
+    touch /var/lib/systemd/linger/gnomeshell && \
+    su -l gnomeshell -c ' \
+        mkdir -p $HOME/.config/systemd/user/sockets.target.wants/ && \
+        ln -s /etc/xdg/systemd/user/[email protected] $HOME/.config/systemd/user/sockets.target.wants/[email protected] \
+    '
 
 # dbus port
 EXPOSE 1234