feat(rest): add can* params in GET /vm/state

doc/usage.md

@@ -351,17 +351,19 @@ None
 Used to obtain the state of the virtual machine that is being run by VFKit.
 
 GET `/vm/state`
-Response: {"state": "string"}
+Response: { "state": string, "canStart": bool, "canPause": bool, "canResume": bool, "canStop": bool, "canHardStop": bool }
+
+> `canHardStop` is only supported on macOS 12 and newer, false will always be returned on older versions.
 
 ### Change VM State
 
 Change the state of the virtual machine. Valid states are:
-* Hardstop
+* HardStop
 * Pause
 * Resume
 * Stop
 
-POST `/vm/state` {"new_state": "new value"}
+POST `/vm/state` { "state": "new value"}
 
 Response: http 200
 

pkg/rest/vf/state_change.go

@@ -53,3 +53,23 @@ func (vm *VzVirtualMachine) HardStop() error {
 	logrus.Debug("force stopping machine")
 	return vm.VzVM.Stop()
 }
+
+func (vm *VzVirtualMachine) CanStart() bool {
+	return vm.VzVM.CanStart()
+}
+
+func (vm *VzVirtualMachine) CanPause() bool {
+	return vm.VzVM.CanPause()
+}
+
+func (vm *VzVirtualMachine) CanResume() bool {
+	return vm.VzVM.CanResume()
+}
+
+func (vm *VzVirtualMachine) CanStop() bool {
+	return vm.VzVM.CanRequestStop()
+}
+
+func (vm *VzVirtualMachine) CanHardStop() bool {
+	return vm.VzVM.CanStop()
+}

pkg/rest/vf/vm_config.go

@@ -33,7 +33,14 @@ func (vm *VzVirtualMachine) Inspect(c *gin.Context) {
 // getVMState retrieves the current vm state
 func (vm *VzVirtualMachine) GetVMState(c *gin.Context) {
 	current := vm.GetState()
-	c.JSON(http.StatusOK, gin.H{"state": current.String()})
+	c.JSON(http.StatusOK, gin.H{
+		"state":       current.String(),
+		"canStart":    vm.CanStart(),
+		"canPause":    vm.CanPause(),
+		"canResume":   vm.CanResume(),
+		"canStop":     vm.CanStop(),
+		"canHardStop": vm.CanHardStop(),
+	})
 }
 
 // setVMState requests a state change on a virtual machine.  At this time only