tagged github releases

* store plugin binary as build artifact in circleci
* added -version option (derived from git tag)

Author: Michael Weber

.circleci/config.yml

@@ -48,6 +48,8 @@ jobs:
           path: test-results/
       - store_artifacts:
           path: test-results/
+      - store_artifacts:
+          path: /go/bin/vault-plugin-splunk
 
       - save_cache:
           name: Saving Cache for vendor
@@ -59,3 +61,38 @@ jobs:
           key: build-cache-{{ arch }}-{{ .Branch }}-{{ .Environment.CIRCLE_BUILD_NUM }}
           paths:
               - /tmp/go/cache
+
+      - persist_to_workspace:
+            root: /go/bin
+            # Must be relative path from root
+            paths:
+                - vault-plugin-splunk
+
+  publish-github-release:
+    docker:
+      - image: cibuilds/github:0.10
+    steps:
+      - attach_workspace:
+          at: ./artifacts
+      - run:
+          name: "Publish Release on GitHub"
+          command: |
+            VERSION=$(artifacts/vault-plugin-splunk -version)
+            ghr -t ${GITHUB_TOKEN} -u ${CIRCLE_PROJECT_USERNAME} -r ${CIRCLE_PROJECT_REPONAME} -c ${CIRCLE_SHA1} -delete ${VERSION} ./artifacts/
+
+workflows:
+  version: 2
+  tagged-build:
+    jobs:
+      - build:
+          filters:
+            tags:
+              only: /^\d+\.\d+\.\d+$/
+      - publish-github-release:
+          requires:
+            - build
+          filters:
+            branches:
+              ignore: /.*/
+            tags:
+              only: /^\d+\.\d+\.\d+$/

Makefile

@@ -1,4 +1,4 @@
-VERSION         := 0.1.0
+VERSION         := $(shell git describe --tags --always 2>/dev/null)
 SHORT_COMMIT    := $(shell git rev-parse --short HEAD 2>/dev/null || echo dev)
 GO_VERSION      := $(shell go version | awk '{ print $$3}' | sed 's/^go//')
 

cmd/vault-plugin-splunk/main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"fmt"
 	"os"
 
 	"github.com/hashicorp/go-hclog"
@@ -10,13 +11,26 @@ import (
 	splunk "github.com/splunk/vault-plugin-splunk"
 )
 
+var (
+	version   string
+	goVersion string
+)
+
 func main() {
 	apiClientMeta := &pluginutil.APIClientMeta{}
 	flags := apiClientMeta.FlagSet()
+	printVersion := flags.Bool("version", false, "Prints version")
+
 	// all plugins ignore Parse errors
 	// #nosec G104
 	flags.Parse(os.Args[1:])
 
+	switch {
+	case *printVersion:
+		fmt.Printf("%s %s (golang %s)\n", os.Args[0], version, goVersion)
+		os.Exit(0)
+	}
+
 	tlsConfig := apiClientMeta.GetTLSConfig()
 	tlsProviderFunc := pluginutil.VaultPluginTLSProvider(tlsConfig)