Merge pull request #23863 from inknos/issue-23436

Add help message when starting multiple machines

pkg/machine/e2e/start_test.go

@@ -210,10 +210,10 @@ var _ = Describe("podman machine start", func() {
 		Expect(startSession1).To(Or(Exit(0), Exit(125)), "start command should succeed or fail with 125")
 		if startSession1.ExitCode() == 0 {
 			Expect(startSession2).To(Exit(125), "first start worked, second start must fail")
-			Expect(startSession2.errorToString()).To(ContainSubstring("machine %s: VM already running or starting", machine1))
+			Expect(startSession2.errorToString()).To(ContainSubstring("machine %s is already running: only one VM can be active at a time", machine1))
 		} else {
 			Expect(startSession2).To(Exit(0), "first start failed, second start succeed")
-			Expect(startSession1.errorToString()).To(ContainSubstring("machine %s: VM already running or starting", machine2))
+			Expect(startSession1.errorToString()).To(ContainSubstring("machine %s is already running: only one VM can be active at a time", machine2))
 		}
 	})
 })

pkg/machine/shim/host.go

@@ -283,7 +283,10 @@ func checkExclusiveActiveVM(provider vmconfigs.VMProvider, mc *vmconfigs.Machine
 			return err
 		}
 		if state == machineDefine.Running || state == machineDefine.Starting {
-			return fmt.Errorf("unable to start %q: machine %s: %w", mc.Name, name, machineDefine.ErrVMAlreadyRunning)
+			if mc.Name == name {
+				return fmt.Errorf("unable to start %q: machine %s: %w", mc.Name, name, machineDefine.ErrVMAlreadyRunning)
+			}
+			return fmt.Errorf("unable to start %q: machine %s is already running: %w", mc.Name, name, machineDefine.ErrMultipleActiveVM)
 		}
 	}
 	return nil