Include Go version, platform, and other build info in version string

Additionally update MatchesServerVersion to only check GitVersion,
GitCommit, and GitTreeState.

hack/lib/version.sh

@@ -126,7 +126,7 @@ kube::version::ldflag() {
 kube::version::ldflags() {
   kube::version::get_version_vars
 
-  local -a ldflags=()
+  local -a ldflags=($(kube::version::ldflag "buildDate" "$(date -u +'%Y-%m-%dT%H:%M:%SZ')"))
   if [[ -n ${KUBE_GIT_COMMIT-} ]]; then
     ldflags+=($(kube::version::ldflag "gitCommit" "${KUBE_GIT_COMMIT}"))
     ldflags+=($(kube::version::ldflag "gitTreeState" "${KUBE_GIT_TREE_STATE}"))

pkg/client/unversioned/helper.go

@@ -18,7 +18,6 @@ package unversioned
 
 import (
 	"fmt"
-	"reflect"
 
 	"k8s.io/kubernetes/pkg/api"
 	"k8s.io/kubernetes/pkg/api/unversioned"
@@ -98,13 +97,14 @@ func MatchesServerVersion(client *Client, c *restclient.Config) error {
 			return err
 		}
 	}
-	clientVersion := version.Get()
-	serverVersion, err := client.Discovery().ServerVersion()
+	cVer := version.Get()
+	sVer, err := client.Discovery().ServerVersion()
 	if err != nil {
 		return fmt.Errorf("couldn't read version from server: %v\n", err)
 	}
-	if s := *serverVersion; !reflect.DeepEqual(clientVersion, s) {
-		return fmt.Errorf("server version (%#v) differs from client version (%#v)!\n", s, clientVersion)
+	// GitVersion includes GitCommit and GitTreeState, but best to be safe?
+	if cVer.GitVersion != sVer.GitVersion || cVer.GitCommit != sVer.GitCommit || cVer.GitTreeState != cVer.GitTreeState {
+		return fmt.Errorf("server version (%#v) differs from client version (%#v)!\n", sVer, cVer)
 	}
 
 	return nil

pkg/metrics/generic_metrics.go

@@ -46,7 +46,7 @@ var CommonMetrics = map[string][]string{
 	"http_response_size_bytes":                 {"handler", "quantile"},
 	"http_response_size_bytes_count":           {"handler"},
 	"http_response_size_bytes_sum":             {"handler"},
-	"kubernetes_build_info":                    {"major", "minor", "gitCommit", "gitTreeState", "gitVersion"},
+	"kubernetes_build_info":                    {"major", "minor", "gitCommit", "gitTreeState", "gitVersion", "buildDate", "goVersion", "compiler", "platform"},
 	"process_cpu_seconds_total":                {},
 	"process_max_fds":                          {},
 	"process_open_fds":                         {},

pkg/version/base.go

@@ -54,4 +54,6 @@ var (
 	gitVersion   string = "v0.0.0-master+$Format:%h$"
 	gitCommit    string = "$Format:%H$"    // sha1 from git, output of $(git rev-parse HEAD)
 	gitTreeState string = "not a git tree" // state of git tree, either "clean" or "dirty"
+
+	buildDate string = "1970-01-01T00:00:00Z" // build date in ISO8601 format, output of $(date -u +'%Y-%m-%dT%H:%M:%SZ')
 )

pkg/version/version.go

@@ -16,7 +16,12 @@ limitations under the License.
 
 package version
 
-import "github.com/prometheus/client_golang/prometheus"
+import (
+	"fmt"
+	"runtime"
+
+	"github.com/prometheus/client_golang/prometheus"
+)
 
 // Info contains versioning information.
 // TODO: Add []string of api versions supported? It's still unclear
@@ -27,6 +32,10 @@ type Info struct {
 	GitVersion   string `json:"gitVersion"`
 	GitCommit    string `json:"gitCommit"`
 	GitTreeState string `json:"gitTreeState"`
+	BuildDate    string `json:"buildDate"`
+	GoVersion    string `json:"goVersion"`
+	Compiler     string `json:"compiler"`
+	Platform     string `json:"platform"`
 }
 
 // Get returns the overall codebase version. It's for detecting
@@ -40,6 +49,10 @@ func Get() Info {
 		GitVersion:   gitVersion,
 		GitCommit:    gitCommit,
 		GitTreeState: gitTreeState,
+		BuildDate:    buildDate,
+		GoVersion:    runtime.Version(),
+		Compiler:     runtime.Compiler,
+		Platform:     fmt.Sprintf("%s/%s", runtime.GOOS, runtime.GOARCH),
 	}
 }
 
@@ -52,12 +65,12 @@ func init() {
 	buildInfo := prometheus.NewGaugeVec(
 		prometheus.GaugeOpts{
 			Name: "kubernetes_build_info",
-			Help: "A metric with a constant '1' value labeled by major, minor, git version, git commit and git tree state from which Kubernetes was built.",
+			Help: "A metric with a constant '1' value labeled by major, minor, git version, git commit, git tree state, build date, Go version, and compiler from which Kubernetes was built, and platform on which it is running.",
 		},
-		[]string{"major", "minor", "gitVersion", "gitCommit", "gitTreeState"},
+		[]string{"major", "minor", "gitVersion", "gitCommit", "gitTreeState", "buildDate", "goVersion", "compiler", "platform"},
 	)
 	info := Get()
-	buildInfo.WithLabelValues(info.Major, info.Minor, info.GitVersion, info.GitCommit, info.GitTreeState).Set(1)
+	buildInfo.WithLabelValues(info.Major, info.Minor, info.GitVersion, info.GitCommit, info.GitTreeState, info.BuildDate, info.GoVersion, info.Compiler, info.Platform).Set(1)
 
 	prometheus.MustRegister(buildInfo)
 }