Disk should returns the size of the disk

Disk key should give the size of the first disk in GB, not the number of hard
drive. During the nova boot, nova will compare this value with the
minimal mandatory size associated with the Glance image.

Without this patch, nova will always fail and returns the "no valid host was found"
message as soon as the size is greater than 1.

README.md

@@ -23,7 +23,7 @@ yields (without logging output):
       	  ],
       	  "cpu": "12",
       	  "memory": "98304",
-      	  "disk": "7",
+      	  "disk": "500",
       	  "arch": "x86_64"
     	},
     	{
@@ -41,7 +41,7 @@ yields (without logging output):
       	  ],
       	  "cpu": "16",
       	  "memory": "131072",
-      	  "disk": "0",
+      	  "disk": "500",
       	  "arch": "x86_64"
     	},
         {
@@ -59,7 +59,7 @@ yields (without logging output):
       	  ],
       	  "cpu": "20",
       	  "memory": "98304",
-      	  "disk": "1",
+      	  "disk": "1200",
       	  "arch": "x86_64"
         }
       ]

main.go

@@ -113,8 +113,19 @@ func getDisk(client *wsman.Client) string {
 		log.Printf("Error getting disks: %v\n", err)
 		return "-1"
 	}
-	vds := search.All(search.Tag("DCIM_VirtualDiskView", "*"), res.AllBodyElements())
-	return strconv.Itoa(len(vds))
+	vd := search.First(search.Tag("DCIM_VirtualDiskView", "*"), res.AllBodyElements())
+	if vd == nil {
+		log.Printf("Error getting first disk information\n")
+		return "-1"
+	}
+	sizeBytes := search.First(search.Tag("SizeInBytes", "*"), vd.Children())
+	if sizeBytes == nil {
+		log.Printf("Error getting first disk size\n")
+		return "-1"
+	}
+	count, err := strconv.Atoi(string(sizeBytes.Content))
+	sizeGBytes := count / (1024 * 1024 * 1024)
+	return strconv.Itoa(sizeGBytes)
 }
 
 func getCPU(client *wsman.Client) string {
@@ -152,15 +163,15 @@ func getBootNic(client *wsman.Client, nics []*dom.Element) *dom.Element {
 			os.Exit(1)
 		}
 		fqdd := string(n.Content) // Only care about integrated nics
-		if ! strings.HasPrefix(fqdd, "NIC.Integrated.") {
-			log.Printf("%s is not integrated, skipping\n",fqdd)
+		if !strings.HasPrefix(fqdd, "NIC.Integrated.") {
+			log.Printf("%s is not integrated, skipping\n", fqdd)
 			continue
 		}
-		speed := search.First(search.Tag("LinkSpeed","*"),nic.Children())
+		speed := search.First(search.Tag("LinkSpeed", "*"), nic.Children())
 		// If there is not speed setting, then the server is too old to report it.
 		// Happily enough, that also means it is too old for 10 gig ports to be a thing.
 		if speed != nil && string(speed.Content) != "3" {
-			log.Printf("%s is not a gigabit Ethernet port\n",fqdd)
+			log.Printf("%s is not a gigabit Ethernet port\n", fqdd)
 			continue
 		}
 		fqdds = append(fqdds, fqdd)