Make version informations consistent between prometheus components

This also fixes #231 by adding the '-version' flag

2 files changed, 97 insertions, 1 deletions

diff --git a/vendor/github.com/prometheus/common/version/info.go b/vendor/github.com/prometheus/common/version/info.go
new file mode 100644
index 0000000..84489a5
--- /dev/null
+++ b/vendor/github.com/prometheus/common/version/info.go
@@ -0,0 +1,89 @@
+// Copyright 2016 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package version
+
+import (
+        "bytes"
+        "fmt"
+        "runtime"
+        "strings"
+        "text/template"
+
+        "github.com/prometheus/client_golang/prometheus"
+)
+
+// Build information. Populated at build-time.
+var (
+        Version   string
+        Revision  string
+        Branch    string
+        BuildUser string
+        BuildDate string
+        GoVersion = runtime.Version()
+)
+
+// NewCollector returns a collector which exports metrics about current version information.
+func NewCollector(program string) *prometheus.GaugeVec {
+        buildInfo := prometheus.NewGaugeVec(
+                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,
+                        ),
+                },
+                []string{"version", "revision", "branch", "goversion"},
+        )
+        buildInfo.WithLabelValues(Version, Revision, Branch, GoVersion).Set(1)
+        return buildInfo
+}
+
+// versionInfoTmpl contains the template used by Info.
+var versionInfoTmpl = `
+{{.program}}, version {{.version}} (branch: {{.branch}}, revision: {{.revision}})
+  build user:       {{.buildUser}}
+  build date:       {{.buildDate}}
+  go version:       {{.goVersion}}
+`
+
+// Print returns version information.
+func Print(program string) string {
+        m := map[string]string{
+                "program":   program,
+                "version":   Version,
+                "revision":  Revision,
+                "branch":    Branch,
+                "buildUser": BuildUser,
+                "buildDate": BuildDate,
+                "goVersion": GoVersion,
+        }
+        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)
+}
+
+// BuildContext returns goVersion, buildUser and buildDate information.
+func BuildContext() string {
+        return fmt.Sprintf("(go=%s, user=%s, date=%s)", GoVersion, BuildUser, BuildDate)
+}
diff --git a/vendor/vendor.json b/vendor/vendor.json
index a1c8650..edd27bb 100644
--- a/vendor/vendor.json
+++ b/vendor/vendor.json
@@ -73,6 +73,12 @@
                         "revisionTime": "2016-01-04T14:47:38+01:00"
                 },
                 {
+                        "checksumSHA1": "91KYK0SpvkaMJJA2+BcxbVnyRO0=",
+                        "path": "github.com/prometheus/common/version",
+                        "revision": "dd586c1c5abb0be59e60f942c22af711a2008cb4",
+                        "revisionTime": "2016-05-03T22:05:32Z"
+                },
+                {
                         "path": "github.com/prometheus/procfs",
                         "revision": "406e5b7bfd8201a36e2bb5f7bdae0b03380c2ce8",
                         "revisionTime": "2015-10-29T15:50:50-04:00"
@@ -87,5 +93,6 @@
                         "revision": "833a04a10549a95dc34458c195cbad61bbb6cb4d",
                         "revisionTime": "2015-12-10T17:34:15-08:00"
                 }
-        ]
+        ],
+        "rootPath": "github.com/prometheus/node_exporter"
 }