Add versioning, pushing releases to github (#4)

.circleci/config.yml

@@ -11,34 +11,46 @@ jobs:
     executor: linuxgo
     steps:
       - checkout
-      - go test -v ./...
+      - run: go test -v ./...
   build:
     executor: linuxgo
     steps:
       - checkout
-      - run: go install ./...
-      - run: mkdir workspace; cp $GOPATH/bin/buildevents workspace/
+      - run: go install -ldflags "-X main.Version=${CIRCLE_TAG}+${CIRCLE_SHA1}" ./...
+      - run: mkdir -v artifacts; cp -v $GOPATH/bin/buildevents artifacts/
       - persist_to_workspace:
-          root: workspace
+          root: artifacts
           paths:
             - buildevents
   publish:
-    executor: linuxgo
+    docker:
+      - image: cibuilds/github:0.12.1
     steps:
       - attach_workspace:
-          at: workspace
-      - # stub for pushing github release
+          at: artifacts
+      - run:
+          name: "Publish Release on GitHub"
+          command: |
+            ghr -t ${GITHUB_TOKEN} -u ${CIRCLE_PROJECT_USERNAME} -r ${CIRCLE_PROJECT_REPONAME} -c ${CIRCLE_SHA1} ${CIRCLE_TAG} ./artifacts/buildevents
 
 workflows:
   build:
     jobs:
-      - test
+      - test:
+          filters:
+            tags:
+              only: /.*/
       - build:
           requires:
             - test
+          filters:
+            tags:
+              only: /.*/
       - publish:
           requires:
             - build
           filters:
+            tags:
+              only: /^v.*/
             branches:
-              only: master
+              ignore: /.*/

main.go

@@ -16,6 +16,9 @@ import (
 	"github.com/honeycombio/libhoney-go/transmission"
 )
 
+// Version will be set by CircleCI based on a git tag and the commit hash
+var Version string
+
 // buildevents expects to get some unchanging values from the environment and
 // the rest as positional arguments on the command line.
 //
@@ -221,6 +224,17 @@ func main() {
 		})
 	}
 
+	if Version == "" {
+		Version = "dev"
+	}
+	libhoney.AddField("meta.version", Version)
+
+	// respond to ./buildevents --version in order to enable circleci to tag releases
+	if os.Args[1] == "--version" {
+		fmt.Println(Version)
+		os.Exit(0)
+	}
+
 	if len(os.Args) < 4 {
 		usage()
 		os.Exit(1)