add snap package support.

snap/local/launcher.sh

+#!/bin/sh
+# Wrapper to check for custom config in $SNAP_USER_COMMON or $SNAP_COMMON and
+# use it otherwise fall back to the included basic config which will at least
+# allow mosquitto to run and do something.
+# This script will also copy the full example config in to SNAP_USER_COMMON or
+# SNAP_COMMON so that people can refer to it.
+#
+# The decision about whether to use SNAP_USER_COMMON or SNAP_COMMON is taken
+# based on the user that runs the command. If the user is root, it is assumed
+# that mosquitto is being run as a system daemon, and SNAP_COMMON will be used.
+# If a non-root user runs the command, then SNAP_USER_COMMON will be used.
+
+case "$SNAP_USER_COMMON" in
+	*/root/snap/tdengine/common*) COMMON=$SNAP_COMMON ;;
+	*)                             COMMON=$SNAP_USER_COMMON ;;
+esac
+
+CONFIG_FILE="$SNAP/etc/taos"
+
+# Launch the snap
+$SNAP/usr/bin/taosd -c $CONFIG_FILE $@

snap/snapcraft.yaml

+name: tdengine
+base: core18 # the base snap is the execution environment for this snap
+version: '2.0.0.6' # just for humans, typically '1.2+git' or '1.3.2'
+summary: Single-line elevator pitch for your amazing snap # 79 char long summary
+description: |
+  TDengine is an open-source big data platform designed and optimized for Internet of Things (IoT), Connected Vehicles, and Industrial IoT. Besides the 10x faster time-series database, it provides caching, stream computing, message queuing and other functionalities to reduce the complexity and costs of development and operations.
+
+grade: stable
+confinement: strict
+
+apps:
+  tdengine:
+    command: launcher.sh
+    daemon: simple
+    restart-condition: always
+    plugs:
+      - network
+      - network-bind
+      - systemfiles
+
+  taos:
+    command: usr/bin/taos
+    plugs:
+      - network
+      - systemfiles
+
+plugs:
+  systemfiles:
+    interface: system-files
+    read:
+      - /etc/taos
+      - /var/lib/taos
+    write:
+      - /var/log/taos
+      - /var/lib/taos
+
+parts:
+  script:
+    plugin: dump
+    source: snap/local/
+    prime:
+      - launcher.sh
+
+  tdengine:
+    source: .
+    source-type: local
+    plugin: cmake
+    build-packages:
+      - gcc
+      - g++
+      - make
+      - cmake
+    override-build: |
+      snapcraftctl build
+      if [ ! -d $SNAPCRAFT_STAGE/usr ]; then
+        mkdir $SNAPCRAFT_STAGE/usr
+      fi
+      if [ ! -d $SNAPCRAFT_STAGE/etc/taos ]; then
+        mkdir -p $SNAPCRAFT_STAGE/etc/taos
+      fi
+      cp $SNAPCRAFT_PART_BUILD/build/* -rf $SNAPCRAFT_STAGE/usr/
+      cp $SNAPCRAFT_PART_SRC/packaging/cfg/taos.cfg -rf $SNAPCRAFT_STAGE/etc/taos/
+
+    prime:
+      - etc/taos/taos.cfg
+      - usr/bin/taosd
+      - usr/bin/taos
+      - usr/bin/taosdemo
+      - usr/lib/libtaos.so.2.0.0.6
+      - usr/lib/libtaos.so.1
+      - usr/lib/libtaos.so
+
+
+    #layout:
+    #  usr/bin/taosd:
+    #bind-file: debug/build/bin/taosd