Add debug commit info

Dockerfile

@@ -1,19 +1,18 @@
 ARG GO_VERSION="1.19"
 
-FROM docker.io/library/golang:${GO_VERSION}-alpine as builder
-RUN apk add --quiet --no-cache --update git
+FROM docker.io/library/golang:${GO_VERSION} as builder
 WORKDIR /src
 COPY . .
 ENV GOPRIVATE="github.com/RealImage/*"
 RUN mkdir /build
 RUN go build -o /build ./...
 
-FROM gcr.io/distroless/static as bouncer
+FROM gcr.io/distroless/base-debian11 as bouncer
 COPY --from=builder /build/bouncer /
 ENV PORT=8080
 ENTRYPOINT ["/bouncer"]
 
-FROM gcr.io/distroless/static as issuer
+FROM gcr.io/distroless/base-debian11 as issuer
 # uses lambda-web-adapter to run our standard HTTP app in a lambda
 # https://github.com/awslabs/aws-lambda-web-adapter
 # for configuration see https://github.com/awslabs/aws-lambda-web-adapter#configurations

cmd/bouncer/main.go

@@ -28,6 +28,10 @@ var spec = struct {
 
 func main() {
 	envconfig.MustProcess(config.Prefix, &spec)
+	if sha, timestamp, ok := config.GetBuildInfo(); ok {
+		log.Println("commit sha: ", sha)
+		log.Println("commit time: ", timestamp)
+	}
 	stats.MaybePushMetrics(spec.MetricsPushUrl, spec.MetricsPushInterval)
 	go serveMetrics(spec.MetricsHost, spec.MetricsPort)
 

cmd/issuer/main.go

@@ -20,6 +20,10 @@ var spec = struct {
 
 func main() {
 	envconfig.MustProcess(config.Prefix, &spec)
+	if sha, timestamp, ok := config.GetBuildInfo(); ok {
+		log.Println("commit sha: ", sha)
+		log.Println("commit time: ", timestamp)
+	}
 	stats.MaybePushMetrics(spec.MetricsPushUrl, spec.MetricsPushInterval)
 
 	ctx, cancel := context.WithCancel(context.Background())

internal/config/buildinfo.go

@@ -0,0 +1,22 @@
+package config
+
+import (
+	"runtime/debug"
+	"time"
+)
+
+func GetBuildInfo() (sha string, timestamp time.Time, ok bool) {
+	var bi *debug.BuildInfo
+	bi, ok = debug.ReadBuildInfo()
+	for _, b := range bi.Settings {
+		switch b.Key {
+		case "vcs.revision":
+			sha = b.Value
+		case "vcs.time":
+			if ts, err := time.Parse(time.RFC3339, b.Value); err == nil {
+				timestamp = ts
+			}
+		}
+	}
+	return
+}