feat: build version information into docker image (#5)

Dockerfile

@@ -13,7 +13,9 @@ RUN apk add --no-cache \
 # The builder build stage compiles the Go code into a static binary.
 FROM golang:1.16-alpine as builder
 
-ARG VERSION=development
+ARG CREATED
+ARG REVISION
+ARG VERSION
 
 WORKDIR /go/src/github.com/joshdk/drone-skip-pipeline
 
@@ -21,7 +23,11 @@ COPY . .
 
 RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build \
     -o /bin/drone-skip-pipeline \
-    -ldflags "-s -w" \
+    -ldflags "-s -w \
+      -X 'jdk.sh/meta.date=$CREATED' \
+      -X 'jdk.sh/meta.sha=$REVISION' \
+      -X 'jdk.sh/meta.version=$VERSION' \
+    " \
     -trimpath \
     main.go
 

go.mod

@@ -1,3 +1,5 @@
 module github.com/joshdk/drone-skip-pipeline
 
 go 1.17
+
+require jdk.sh/meta v0.1.1-0.20211021015548-cff3b930ebd9

go.sum

@@ -0,0 +1,4 @@
+jdk.sh/meta v0.1.0 h1:BTDH9cL/el15OSZWRcnbdOzynyr7hlRlYrTSJCrcKbo=
+jdk.sh/meta v0.1.0/go.mod h1:c2+wWgMZejSQ2nXsbxNVKLLQgTLY4yrX7TH6NIaQle0=
+jdk.sh/meta v0.1.1-0.20211021015548-cff3b930ebd9 h1:f9CEE/IWIjsG3jBxNc/rfJ17031Oe7ghTWkPg6JJ6Bo=
+jdk.sh/meta v0.1.1-0.20211021015548-cff3b930ebd9/go.mod h1:c2+wWgMZejSQ2nXsbxNVKLLQgTLY4yrX7TH6NIaQle0=

main.go

@@ -1,7 +1,25 @@
+// Copyright Josh Komoroske. All rights reserved.
+// Use of this source code is governed by the MIT license,
+// a copy of which can be found in the LICENSE.txt file.
+// SPDX-License-Identifier: MIT
+
 package main
 
-import "fmt"
+import (
+	"log"
+	"os"
+
+	"jdk.sh/meta"
+)
 
 func main() {
-	fmt.Println("drone-skip-pipeline")
+	if err := mainCmd(); err != nil {
+		log.Println("joshdk/drone-skip-pipeline:", err)
+		os.Exit(1)
+	}
+}
+
+func mainCmd() error {
+	log.Printf("joshdk/drone-skip-pipeline %s (%s)\n", meta.Version(), meta.ShortSHA())
+	return nil
 }