name: edgex-device-gps
# The snap to derive the runtime rootfs from, here core18 corresponds to a 
# minimal Ubuntu 18.04 Server rootfs
base: core18
type: app
adopt-info: version
license: Apache-2.0
title: EdgeX Simple Device Service
summary: Demonstrate the Device SDK go in EdgeX using device-gps
description: |
  device-simple is an example EdgeX Device Service built using the 
  device-sdk-go.

# delhi: 0, edinburgh: 1, fuji: 2, geneva: 3, ireland: 4
epoch: 4

# What architectures to build the snap on
architectures:
  - build-on: amd64
  - build-on: arm64

# The "stability" of the snap and what users can expect from it
# Note that "devel" grade cannot be released to stable or candidate channels
grade: stable
confinement: strict

apps:
  device-simple:
    # `adapter` specifies what kind of environment variables need to be setup
    # for the app, since our app is a statically compiled go app, we don't 
    # need any of the env vars, but if this was a c program or used cgo, we 
    # would need adapter: full
    adapter: none
    command: bin/device-gps --registry $CONFIG_PRO_ARG $CONF_ARG
    # Since we can't include the colon ':' characters in the command above,
    # we need to specify the consul address in an env var like so
    # see https://bugs.launchpad.net/snapd/+bug/1827392 for more details
    environment:
      CONFIG_PRO_ARG: "--cp=consul.http://localhost:8500"
      CONF_ARG: "--configDir=$SNAP_DATA/config/device-gps/res"
      DEVICE_DEVICESDIR: "$SNAP_DATA/config/device-gps/res/devices"
      DEVICE_PROFILESDIR: "$SNAP_DATA/config/device-gps/res/profiles"
    # The service is a simple service that is directly exec'd and expected to
    # always run in a single long-lived process
    daemon: simple
    # Use network and network-bind plugs to access the network and bind to 
    # ports on network interfaces
    plugs: [network, network-bind]

parts:
  version:
    plugin: nil
    source: snap/local
    override-pull: |
      cd $SNAPCRAFT_PROJECT_DIR
      GIT_VERSION=$(git describe --tags --abbrev=0 | sed 's/v//')
      snapcraftctl set-version ${GIT_VERSION}

  device-simple:
    source: .
    plugin: make
    build-packages: [git, libzmq3-dev, zip, pkg-config]
    build-snaps:
      - go/1.16/stable
    stage-packages: [libzmq5]
    override-build: |
      # Build device-simple first
      cd $SNAPCRAFT_PART_SRC
      make build

      # Copy the resulting binary into $SNAPCRAFT_PART_INSTALL in the build
      # environment, which snapcraft will pack into $SNAP when the build is
      # done.
      install -DT "./example/cmd/device-simple/device-simple" \
        "$SNAPCRAFT_PART_INSTALL/bin/device-simple"
      
      # "ProfilesDir" in combination with the confdir and profile command-line
      # options are sufficient to not need to cd before exec'ing the binary.
      # Change "ProfilesDir" to be under $SNAP_DATA which is writable and 
      # where the install hook copies the config files and device profiles to
      # when the snap is first installed
      install -DT "./example/cmd/device-simple/res/configuration.yaml" \
        "$SNAPCRAFT_PART_INSTALL/config/device-simple/res/configuration.yaml"

      # Install the example device and device profile
      install -DT "./example/cmd/device-simple/res/devices/simple-device.toml" \
        "$SNAPCRAFT_PART_INSTALL/config/device-simple/res/devices/simple-device.toml"
      install -DT "./example/cmd/device-simple/res/profiles/Simple-Driver.yaml" \
        "$SNAPCRAFT_PART_INSTALL/config/device-simple/res/profiles/Simple-Driver.yaml"

      # Also install the Attribution.txt and LICENSE files into the snap at 
      # usr/share/doc/device-simple which is a debian standard location for
      # licenses in the snap.
      # Note also if the license is changed that the license key in the
      # metadata for the snap at the top of this file should be updated too.
      install -DT "./example/cmd/device-simple/Attribution.txt" \
         "$SNAPCRAFT_PART_INSTALL/usr/share/doc/device-simple/Attribution.txt"
      install -DT "./LICENSE" \
         "$SNAPCRAFT_PART_INSTALL/usr/share/doc/device-simple/LICENSE"