/usr/share/upstart/sessions/unity8.conf is in unity8 8.12+16.04.20160401-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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author "Ricardo Mendoza <ricmm@ubuntu.com>"
emits indicator-services-start
start on ((xsession SESSION=ubuntu-touch) or (xsession SESSION=unity8-mir)) and started dbus
stop on desktop-end
kill timeout 120
respawn
expect stop
pre-start script
# Tell unity-mir to raise SIGSTOP after we start
initctl set-env UNITY_MIR_EMITS_SIGSTOP=1
if [ -n "$MIR_SOCKET" ]; then
# FIXME Create an autopilot test that makes sure start+stop and restart
# work fine at least 2 times
# Save original value of MIR_SOCKET in case we are stopped,
# as we modify the variable for future jobs, including ourself.
UNITY_MIR_SOCKET=$(initctl get-env --global MIR_SOCKET)
initctl set-env --global UNITY_MIR_SOCKET=$UNITY_MIR_SOCKET
# Point unity8 at unity-system-compositor
MIR_SERVER_FILE=$XDG_RUNTIME_DIR/mir_socket
initctl set-env MIR_SERVER_FILE=$MIR_SERVER_FILE
initctl set-env MIR_SERVER_HOST_SOCKET=$UNITY_MIR_SOCKET
# Point all future jobs in this session to our Mir socket instead of
# unity-system-compositor's socket.
initctl set-env --global MIR_SOCKET=$MIR_SERVER_FILE
gdbus call --session --dest org.freedesktop.DBus --object-path /org/freedesktop/DBus --method org.freedesktop.DBus.UpdateActivationEnvironment "@a{ss} {'MIR_SOCKET': '$MIR_SERVER_FILE'}"
fi
# Remove the normal and trusted sockets if still there
if [ -S "$MIR_SERVER_FILE" ]; then
rm "$MIR_SERVER_FILE"
fi
if [ -S "${MIR_SERVER_FILE}_trusted" ]; then
rm "${MIR_SERVER_FILE}_trusted"
fi
initctl set-env --global MIR_SERVER_PROMPT_FILE=1
end script
exec ${BINARY:-unity8} $ARGS
post-start script
initctl emit --no-wait indicator-services-start
# Disable Qt's stuttering 'touch compression' to fix scrolling smoothness
# issues (LP: #1486341). As a bonus, this eliminates most of the
# lag seen in the indicator panel pull-down (LP: #1488327) and also
# reduces lag seen in apps:
initctl set-env --global QML_NO_TOUCH_COMPRESSION=1
# For twice the fun and half the latency, try this (Warning: not all
# devices are fast enough to keep up smoothly yet)...
# initctl set-env MIR_SERVER_NBUFFERS=2
end script
post-stop script
initctl set-env --global MIR_SOCKET=$UNITY_MIR_SOCKET
initctl unset-env --global UNITY_MIR_SOCKET
initctl unset-env --global MIR_SERVER_PROMPT_FILE
initctl emit application-end
end script
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