Snap: launcher.sh seems to break Parallel installs

[jmgiaever]

Mosquitto install method: snap

How?

• How:
  • sudo snap set system experimental.parallel-instances=true && sudo reboot (Ref: Parallel Installs: «We recommend rebooting the system after toggling the experimental.parallel-instances flag state to avoid [...]»)
  • sudo snap install mosquitto mosquitto_other

Problem?

The launcher.sh-script in the RO filesystem seems to break Parallel Installs, when case is true:

case "$SNAP_USER_COMMON" in
        */root/snap/mosquitto/common*) COMMON=$SNAP_COMMON ;;
        *)                             COMMON=$SNAP_USER_COMMON ;;
esac

Parallel installs will use default_config.conf file, which is just readable. I would expect it to take into consideration its own namespace, e.g  */root/snap/$SNAP_INSTANCE_NAME/common (SNAP_INSTANCE_NAME=mosquitto_<instance>) or something similar.