Fix capitalized Vnc field and increment Vnc on run (#139)

Corrected the struct field 'vnc' to 'Vnc' to match Go's public field naming conventions and to make it exportable. Each QEMU virtual machine's VNC display number now increments upon instantiation to avoid display conflicts.

Signed-off-by: SammyOina <sammyoina@gmail.com>

manager/qemu/config.go

@@ -55,7 +55,7 @@ type SevConfig struct {
 type VSockConfig struct {
 	ID       string `env:"VSOCK_ID"        envDefault:"vhost-vsock-pci0"`
 	GuestCID int    `env:"VSOCK_GUEST_CID" envDefault:"3"`
-	vnc      int    `env:"VSOCK_VNC"       envDefault:"0"`
+	Vnc      int    `env:"VSOCK_VNC"       envDefault:"0"`
 }
 
 type Config struct {
@@ -157,7 +157,7 @@ func constructQemuArgs(config Config) []string {
 			config.VirtioNetPciConfig.ROMFile))
 
 	args = append(args, "-device", fmt.Sprintf("vhost-vsock-pci,id=%s,guest-cid=%d", config.VSockConfig.ID, config.VSockConfig.GuestCID))
-	args = append(args, "-vnc", fmt.Sprintf(":%d", config.vnc))
+	args = append(args, "-vnc", fmt.Sprintf(":%d", config.Vnc))
 
 	if config.EnableSEVSNP {
 		args = append(args, "-object",

manager/service.go

@@ -119,6 +119,7 @@ func (ms *managerService) Run(ctx context.Context, c *manager.ComputationRunReq)
 		return "", err
 	}
 	ms.qemuCfg.VSockConfig.GuestCID++
+	ms.qemuCfg.VSockConfig.Vnc++
 
 	ms.publishEvent("vm-provision", c.Id, "complete", json.RawMessage{})
 	return fmt.Sprint(ms.qemuCfg.HostFwdAgent), nil