Fill in version information

Makefile

@@ -178,7 +178,13 @@ LATEST_BUILD_IMAGE_TAG ?= trafficdump-b1d000267
 # as it currently disallows TTY devices. This value needs to be overridden
 # in any custom cloudbuild.yaml files
 TTY := --tty
-GO_FLAGS := -ldflags "-X main.Branch=$(GIT_BRANCH) -X main.Revision=$(GIT_REVISION) -X main.Version=$(VERSION) -extldflags \"-static\" -s -w" -tags netgo
+MIMIR_VERSION := github.com/grafana/mimir/pkg/util/version
+
+GO_FLAGS := -ldflags "\
+		-X $(MIMIR_VERSION).Branch=$(GIT_BRANCH) \
+		-X $(MIMIR_VERSION).Revision=$(GIT_REVISION) \
+		-X $(MIMIR_VERSION).Version=$(VERSION) \
+		-extldflags \"-static\" -s -w" -tags netgo
 
 ifeq ($(BUILD_IN_CONTAINER),true)
 
@@ -344,7 +350,7 @@ check-makefiles: format-makefiles
 .PHONY: format-makefiles
 format-makefiles: ## Format all Makefiles.
 format-makefiles: $(MAKEFILES)
-	sed -i -e 's/^\(\t*\)  /\1\t/g' -e 's/^\(\t*\) /\1/' -- $?
+	$(SED) -i -e 's/^\(\t*\)  /\1\t/g' -e 's/^\(\t*\) /\1/' -- $?
 
 clean:
 	$(SUDO) docker rmi $(IMAGE_NAMES) >/dev/null 2>&1 || true

cmd/mimir/main.go

@@ -21,19 +21,12 @@ import (
 	"github.com/grafana/dskit/flagext"
 	"github.com/pkg/errors"
 	"github.com/prometheus/client_golang/prometheus"
-	"github.com/prometheus/common/version"
 	"github.com/weaveworks/common/tracing"
 	"gopkg.in/yaml.v2"
 
 	"github.com/grafana/mimir/pkg/mimir"
 	util_log "github.com/grafana/mimir/pkg/util/log"
-)
-
-// Version is set via build flag -ldflags -X main.Version
-var (
-	Version  string
-	Branch   string
-	Revision string
+	"github.com/grafana/mimir/pkg/util/version"
 )
 
 // configHash exposes information about the loaded config
@@ -46,9 +39,6 @@ var configHash *prometheus.GaugeVec = prometheus.NewGaugeVec(
 )
 
 func init() {
-	version.Version = Version
-	version.Branch = Branch
-	version.Revision = Revision
 	prometheus.MustRegister(version.NewCollector("mimir"))
 	prometheus.MustRegister(version.NewCollector("cortex"))
 	prometheus.MustRegister(configHash)

pkg/util/version/info.go

@@ -0,0 +1,78 @@
+// SPDX-License-Identifier: AGPL-3.0-only
+// Provenance-includes-location: https://github.com/prometheus/common/blob/main/version/info.go
+// Provenance-includes-license: Apache-2.0
+// Provenance-includes-copyright: The Prometheus Authors.
+
+package version
+
+import (
+	"bytes"
+	"fmt"
+	"runtime"
+	"strings"
+	"text/template"
+
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+// Build information. Populated at build-time.
+// Note: Removed BuildUser and BuildDate for reproducible builds
+var (
+	Version   string = "unknown"
+	Revision  string = "unknown"
+	Branch    string = "unknown"
+	GoVersion        = runtime.Version()
+)
+
+// NewCollector returns a collector that exports metrics about current version
+// information.
+func NewCollector(program string) prometheus.Collector {
+	return prometheus.NewGaugeFunc(
+		prometheus.GaugeOpts{
+			Namespace: program,
+			Name:      "build_info",
+			Help: fmt.Sprintf(
+				"A metric with a constant '1' value labeled by version, revision, branch, and goversion from which %s was built.",
+				program,
+			),
+			ConstLabels: prometheus.Labels{
+				"version":   Version,
+				"revision":  Revision,
+				"branch":    Branch,
+				"goversion": GoVersion,
+			},
+		},
+		func() float64 { return 1 },
+	)
+}
+
+// versionInfoTmpl contains the template used by Info.
+var versionInfoTmpl = `
+{{.program}}, version {{.version}} (branch: {{.branch}}, revision: {{.revision}})
+  go version:       {{.goVersion}}
+  platform:         {{.platform}}
+`
+
+// Print returns version information.
+func Print(program string) string {
+	m := map[string]string{
+		"program":   program,
+		"version":   Version,
+		"revision":  Revision,
+		"branch":    Branch,
+		"goVersion": GoVersion,
+		"platform":  runtime.GOOS + "/" + runtime.GOARCH,
+	}
+	t := template.Must(template.New("version").Parse(versionInfoTmpl))
+
+	var buf bytes.Buffer
+	if err := t.ExecuteTemplate(&buf, "version", m); err != nil {
+		panic(err)
+	}
+	return strings.TrimSpace(buf.String())
+}
+
+// Info returns version, branch and revision information.
+func Info() string {
+	return fmt.Sprintf("(version=%s, branch=%s, revision=%s)", Version, Branch, Revision)
+}