Periodically check for newer versions of scope.

README.md

@@ -56,6 +56,13 @@ such, the Scope app endpoint (port 4040) should not be made accessible on
 the Internet.  Additionally traffic between the app and the probe is currently
 insecure and should not traverse the internet.
 
+Scope will periodically check with our servers to see if a new version is
+availible.  To disable this, run:
+
+```
+CHECKPOINT_DISABLE=true scope launch
+```
+
 ## <a name="architecture"></a>Architecture
 
 Weave Scope consists of two components: the app and the probe. These two

prog/app.go

@@ -11,6 +11,7 @@ import (
 	"time"
 
 	"github.com/gorilla/mux"
+	"github.com/weaveworks/go-checkpoint"
 	"github.com/weaveworks/weave/common"
 
 	"github.com/weaveworks/scope/app"
@@ -42,6 +43,19 @@ func appMain() {
 
 	defer log.Print("app exiting")
 
+	// Start background version checking
+	params := checkpoint.CheckParams{
+		Product:       "scope-app",
+		Version:       app.Version,
+		SignatureFile: signatureFile,
+	}
+	checkpoint.CheckInterval(&params, 2*60*time.Minute, func(r *checkpoint.CheckResponse, err error) {
+		if r.Outdated {
+			log.Printf("Scope version %s is availible; please update at %s",
+				r.CurrentVersion, r.CurrentDownloadURL)
+		}
+	})
+
 	rand.Seed(time.Now().UnixNano())
 	app.UniqueID = strconv.FormatInt(rand.Int63(), 16)
 	app.Version = version

prog/probe.go

@@ -14,6 +14,7 @@ import (
 	"time"
 
 	"github.com/armon/go-metrics"
+	"github.com/weaveworks/go-checkpoint"
 	"github.com/weaveworks/weave/common"
 
 	"github.com/weaveworks/scope/common/hostname"
@@ -30,6 +31,31 @@ import (
 	"github.com/weaveworks/scope/report"
 )
 
+const (
+	signatureFile = "/etc/weave/signature"
+)
+
+func check() {
+	handleResponse := func(r *checkpoint.CheckResponse, err error) {
+		if err != nil {
+			log.Printf("Error checking version: %v", err)
+		} else if r.Outdated {
+			log.Printf("Scope version %s is available; please update at %s",
+				r.CurrentVersion, r.CurrentDownloadURL)
+		}
+	}
+
+	// Start background version checking
+	params := checkpoint.CheckParams{
+		Product:       "scope-probe",
+		Version:       version,
+		SignatureFile: signatureFile,
+	}
+	resp, err := checkpoint.Check(&params)
+	handleResponse(resp, err)
+	checkpoint.CheckInterval(&params, 2*60*time.Minute, handleResponse)
+}
+
 // Main runs the probe
 func probeMain() {
 	var (
@@ -77,6 +103,7 @@ func probeMain() {
 		hostID   = hostName // TODO(pb): we should sanitize the hostname
 	)
 	log.Printf("probe starting, version %s, ID %s", version, probeID)
+	go check()
 
 	addrs, err := net.InterfaceAddrs()
 	if err != nil {

scope

@@ -92,6 +92,8 @@ check_not_running() {
 launch_command() {
     echo docker run --privileged -d --name=$SCOPE_CONTAINER_NAME --net=host --pid=host \
             -v /var/run/docker.sock:/var/run/docker.sock \
+            -v /etc/weave:/etc/weave \
+            -e CHECKPOINT_DISABLE \
             $WEAVESCOPE_DOCKER_ARGS $SCOPE_IMAGE --probe.docker true "$@"
 }