Fix integration test and address comments

.dockerignore

@@ -0,0 +1,14 @@
+# Ignore files
+*.md
+*.sh
+*.yml
+*.yaml
+.gitignore
+
+# Ignore folders
+.github/
+.git/
+contrib/
+
+# Don't include a previously built binary
+unbound_exporter

Dockerfile

@@ -1,14 +1,9 @@
 FROM --platform=$BUILDPLATFORM docker.io/library/golang:1.21.4-bookworm AS build
 
-WORKDIR /go/src/app
-
-COPY go.mod .
-COPY go.sum .
+VOLUME . /go/src/app
 
 RUN go mod download
 
-COPY *.go .
-
 ENV CGO_ENABLED=0
 
 RUN GOOS=$TARGETOS GOARCH=$TARGETPLATFORM go build -v -o /go/bin/unbound_exporter ./...

build/vars.go

@@ -0,0 +1,28 @@
+package build
+
+const Unspecified = "Unspecified"
+
+// BuildID is set by the compiler (using -ldflags "-X util.BuildID $(git rev-parse --short HEAD)")
+// and is used by GetID
+var BuildID string
+
+// BuildBranch is set by the compiler and is used by GetBranch
+var BuildBranch string
+
+// GetBuildID identifies what build is running.
+func GetID() (BuildID string) {
+	if BuildID != "" {
+		return BuildID
+	}
+
+	return Unspecified
+}
+
+// GetBranch identifies the building host
+func GetBranch() (BuildBranch string) {
+	if BuildBranch != "" {
+		return BuildBranch
+	}
+
+	return Unspecified
+}

unbound_exporter.go

@@ -32,7 +32,7 @@ import (
 	"sort"
 
 	"github.com/go-kit/log/level"
-	"github.com/letsencrypt/unbound_exporter/util"
+	"github.com/letsencrypt/unbound_exporter/build"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
 	"github.com/prometheus/common/promlog"
@@ -552,7 +552,7 @@ func main() {
 
 	_ = level.Info(log).Log(
 		"msg", "Starting unbound_exporter",
-		"version", fmt.Sprintf("(version=%s, branch=%s, revision=%s)", runtime.Version(), util.GetBuildBranch(), util.GetBuildID()),
+		"version", fmt.Sprintf("(version=%s, branch=%s, revision=%s)", runtime.Version(), build.GetBranch(), build.GetID()),
 	)
 	exporter, err := NewUnboundExporter(*unboundHost, *unboundCa, *unboundCert, *unboundKey)
 	if err != nil {