Allow creating VMs with implicit CPU and memory (#243)

* Allow creating VMs with implicit CPU and memory

* Clarify why cpu/memory can be 0 a bit better

* Controller(API): don't forget to update DefaultCPU and DefaultMemory

* Add an integration test for implicit CPU and memory

internal/command/get/vm.go

@@ -65,8 +65,21 @@ func runGetVM(cmd *cobra.Command, args []string) error {
 	table.AddRow("Created", createdAtInfo)
 	table.AddRow("Image", vm.Image)
 	table.AddRow("Image pull policy", vm.ImagePullPolicy)
-	table.AddRow("CPU", vm.CPU)
-	table.AddRow("Memory", vm.Memory)
+
+	cpu := vm.CPU
+	if cpu == 0 {
+		// Implicit CPU assignment, CPU will always be 0
+		cpu = vm.AssignedCPU
+	}
+	table.AddRow("CPU", cpu)
+
+	memory := vm.Memory
+	if memory == 0 {
+		// Implicit memory assignment, memory will always be 0
+		memory = vm.AssignedMemory
+	}
+	table.AddRow("Memory", memory)
+
 	table.AddRow("Softnet enabled", vm.NetSoftnet)
 	table.AddRow("Bridged networking interface", nonEmptyOrNone(vm.NetBridged))
 	table.AddRow("Headless mode", vm.Headless)

internal/command/worker/run.go

@@ -29,6 +29,8 @@ var bootstrapTokenStdin bool
 var logFilePath string
 var stringToStringResources map[string]string
 var noPKI bool
+var defaultCPU uint64
+var defaultMemory uint64
 var debug bool
 
 func newRunCommand() *cobra.Command {
@@ -53,6 +55,10 @@ func newRunCommand() *cobra.Command {
 		"do not use the host's root CA set and instead validate the Controller's presented "+
 			"certificate using a bootstrap token (or manually via fingerprint, "+
 			"if no bootstrap token is provided)")
+	cmd.PersistentFlags().Uint64Var(&defaultCPU, "default-cpu", 4, "number of CPUs to use for VMs "+
+		"that do not explicitly specify a value")
+	cmd.PersistentFlags().Uint64Var(&defaultMemory, "default-memory", 8*1024, "megabytes of memory "+
+		"to use for VMs that do not explicitly specify a value")
 	cmd.PersistentFlags().BoolVar(&debug, "debug", false, "enable debug logging")
 
 	return cmd
@@ -116,6 +122,7 @@ func runWorker(cmd *cobra.Command, args []string) (err error) {
 		controllerClient,
 		worker.WithName(name),
 		worker.WithResources(resources),
+		worker.WithDefaultCPUAndMemory(defaultCPU, defaultMemory),
 		worker.WithLogger(logger),
 	)
 	if err != nil {