Inject version number into plugin description (#3)

Makefile

@@ -1,6 +1,14 @@
 # Copyright (c) 2019 VMware, Inc. All Rights Reserved.
 # SPDX-License-Identifier: Apache-2.0
 
+SHELL=/bin/bash
+# Obtain the version and git commit info
+GIT_VERSION=$(shell git describe --match 'v*' --always)
+
+# Override the value of the version variable in main.go
+LD_FLAGS= '-X main.version=$(GIT_VERSION)'
+GO_FLAGS= -ldflags=$(LD_FLAGS)
+
 ifdef XDG_CONFIG_HOME
 	OCTANT_PLUGINSTUB_DIR ?= ${XDG_CONFIG_HOME}/octant/plugins
 # Determine in on windows
@@ -16,7 +24,7 @@ RECURSIVE_DIRS = $(addsuffix /...,$(DIRS))
 .PHONY: install-plugin
 install-plugin:
 	mkdir -p $(OCTANT_PLUGINSTUB_DIR)
-	go build -o $(OCTANT_PLUGINSTUB_DIR)/airship-ui-plugin opendev.org/airship/airshipui/cmd/airshipui
+	go build -o $(OCTANT_PLUGINSTUB_DIR)/airship-ui-plugin $(GO_FLAGS) opendev.org/airship/airshipui/cmd/airshipui
 
 .PHONY: test
 test: generate

cmd/airshipui/main.go

@@ -1,19 +1,25 @@
 package main
 
 import (
+    "fmt"
     "log"
     "opendev.org/airship/airshipui/internal/plugin"
 )
 
-var pluginName = "airship-ui"
+var (
+    pluginName = "airship-ui"
+    // version will be overriden by ldflags supplied in Makefile
+    version = "(dev-version)"
+)
 
 // This is a sample plugin showing the features of Octant's plugin API.
 func main() {
     // Remove the prefix from the go logger since Octant will print logs with timestamps.
     log.SetPrefix("")
 
+    description := fmt.Sprintf("Airship UI version %s", version)
     // Use the plugin service helper to register this plugin.
-    p, err := plugin.Register(pluginName, "Airship UI")
+    p, err := plugin.Register(pluginName, description)
     if err != nil {
         log.Fatal(err)
     }