Fixes #2595 `dm rm` fails when config.json is not found

This issue occurs when `api.Load()` fails while loading
the `config.json` file, in case the config file is not present.
Refactored the code to handled `-y` and `-f` as documented.
Now added UT for remove options.

Signed-off-by: Anil Belur <askb23@gmail.com>

commands/rm.go

@@ -17,9 +17,13 @@ func cmdRm(c CommandLine, api libmachine.API) error {
 	confirm := c.Bool("y")
 
 	for _, hostName := range c.Args() {
-		h, err := api.Load(hostName)
+		h, loaderr := api.Load(hostName)
-		if err != nil {
+		if loaderr != nil {
-			return fmt.Errorf("Error removing host %q: %s", hostName, err)
+			// On --force, continue to remove on-disk files/dir
+			if !force {
+				return fmt.Errorf("Error removing host %q: %s", hostName, loaderr)
+			}
+			log.Errorf("Error removing host %q: %s. Continuing on `-f`, host instance may by running", hostName, loaderr)
 		}
 
 		if !confirm && !force {
@@ -29,12 +33,14 @@ func cmdRm(c CommandLine, api libmachine.API) error {
 			}
 		}
 
+		if loaderr == nil {
 			if err := h.Driver.Remove(); err != nil {
 				if !force {
 					log.Errorf("Provider error removing machine %q: %s", hostName, err)
 					continue
 				}
 			}
+		}
 
 		if err := api.Remove(hostName); err != nil {
 			log.Errorf("Error removing machine %q from store: %s", hostName, err)

commands/rm_test.go

@@ -53,3 +53,87 @@ func TestCmdRm(t *testing.T) {
 	assert.False(t, libmachinetest.Exists(api, "machineToRemove2"))
 	assert.True(t, libmachinetest.Exists(api, "machine"))
 }
+
+func TestCmdRmforcefully(t *testing.T) {
+	commandLine := &commandstest.FakeCommandLine{
+		CliArgs: []string{"machineToRemove1", "machineToRemove2"},
+		LocalFlags: &commandstest.FakeFlagger{
+			Data: map[string]interface{}{
+				"force": true,
+			},
+		},
+	}
+	api := &libmachinetest.FakeAPI{
+		Hosts: []*host.Host{
+			{
+				Name:   "machineToRemove1",
+				Driver: &fakedriver.Driver{},
+			},
+			{
+				Name:   "machineToRemove2",
+				Driver: &fakedriver.Driver{},
+			},
+		},
+	}
+
+	err := cmdRm(commandLine, api)
+	assert.NoError(t, err)
+
+	assert.False(t, libmachinetest.Exists(api, "machineToRemove1"))
+	assert.False(t, libmachinetest.Exists(api, "machineToRemove2"))
+}
+
+func TestCmdRmforceDoesAutoConfirm(t *testing.T) {
+	commandLine := &commandstest.FakeCommandLine{
+		CliArgs: []string{"machineToRemove1", "machineToRemove2"},
+		LocalFlags: &commandstest.FakeFlagger{
+			Data: map[string]interface{}{
+				"y":     false,
+				"force": true,
+			},
+		},
+	}
+	api := &libmachinetest.FakeAPI{
+		Hosts: []*host.Host{
+			{
+				Name:   "machineToRemove1",
+				Driver: &fakedriver.Driver{},
+			},
+			{
+				Name:   "machineToRemove2",
+				Driver: &fakedriver.Driver{},
+			},
+		},
+	}
+
+	err := cmdRm(commandLine, api)
+	assert.NoError(t, err)
+
+	assert.False(t, libmachinetest.Exists(api, "machineToRemove1"))
+	assert.False(t, libmachinetest.Exists(api, "machineToRemove2"))
+}
+
+func TestCmdRmforceConfirmUnset(t *testing.T) {
+	commandLine := &commandstest.FakeCommandLine{
+		CliArgs: []string{"machineToRemove1"},
+		LocalFlags: &commandstest.FakeFlagger{
+			Data: map[string]interface{}{
+				"y":     false,
+				"force": false,
+			},
+		},
+	}
+	api := &libmachinetest.FakeAPI{
+		Hosts: []*host.Host{
+			{
+				Name:   "machineToRemove1",
+				Driver: &fakedriver.Driver{},
+			},
+		},
+	}
+
+	err := cmdRm(commandLine, api)
+	assert.EqualError(t, err, "EOF")
+
+	assert.True(t, libmachinetest.Exists(api, "machineToRemove1"))
+}