add buildtime, kernelversion and experimental to API version

Signed-off-by: Victor Vieux <[email protected]>

Dockerfile

@@ -4,7 +4,7 @@ COPY . /go/src/github.com/docker/swarm
 WORKDIR /go/src/github.com/docker/swarm
 
 ENV GOPATH /go/src/github.com/docker/swarm/Godeps/_workspace:$GOPATH
-RUN CGO_ENABLED=0 go install -v -a -tags netgo -installsuffix netgo -ldflags "-w -X github.com/docker/swarm/version.GITCOMMIT `git rev-parse --short HEAD`"
+RUN CGO_ENABLED=0 go install -v -a -tags netgo -installsuffix netgo -ldflags "-w -X github.com/docker/swarm/version.GITCOMMIT `git rev-parse --short HEAD` -X github.com/docker/swarm/version.BUILDTIME \"`date -u`\""
 
 ENV SWARM_HOST :2375
 EXPOSE 2375

api/handlers.go

@@ -14,8 +14,11 @@ import (
 	"strings"
 	"time"
 
+	"github.com/docker/docker/pkg/parsers/kernel"
+	apitypes "github.com/docker/engine-api/types"
 	dockerfilters "github.com/docker/engine-api/types/filters"
 	"github.com/docker/swarm/cluster"
+	"github.com/docker/swarm/experimental"
 	"github.com/docker/swarm/version"
 	"github.com/gorilla/mux"
 	"github.com/samalba/dockerclient"
@@ -55,13 +58,19 @@ func getInfo(c *context, w http.ResponseWriter, r *http.Request) {
 
 // GET /version
 func getVersion(c *context, w http.ResponseWriter, r *http.Request) {
-	version := dockerclient.Version{
-		Version:    "swarm/" + version.VERSION,
-		ApiVersion: APIVERSION,
-		GoVersion:  runtime.Version(),
-		GitCommit:  version.GITCOMMIT,
-		Os:         runtime.GOOS,
-		Arch:       runtime.GOARCH,
+	version := apitypes.Version{
+		Version:      "swarm/" + version.VERSION,
+		APIVersion:   APIVERSION,
+		GoVersion:    runtime.Version(),
+		GitCommit:    version.GITCOMMIT,
+		Os:           runtime.GOOS,
+		Arch:         runtime.GOARCH,
+		Experimental: experimental.ENABLED,
+		BuildTime:    version.BUILDTIME,
+	}
+
+	if kernelVersion, err := kernel.GetKernelVersion(); err == nil {
+		version.KernelVersion = kernelVersion.String()
 	}
 
 	w.Header().Set("Content-Type", "application/json")

version/version.go

@@ -6,4 +6,7 @@ var (
 
 	// GITCOMMIT will be overwritten automatically by the build system
 	GITCOMMIT = "HEAD"
+
+	// BUILDTIME will be overwritten automatically by the build system
+	BUILDTIME = "<unknown>"
 )