failing test for backend re-init

command/init_test.go

@@ -1,6 +1,7 @@
 package command
 
 import (
+	"encoding/json"
 	"fmt"
 	"io/ioutil"
 	"log"
@@ -410,6 +411,51 @@ func TestInit_backendConfigKV(t *testing.T) {
 	}
 }
 
+func TestInit_backendConfigKVReInit(t *testing.T) {
+	// Create a temporary working directory that is empty
+	td := tempDir(t)
+	copy.CopyDir(testFixturePath("init-backend-config-kv"), td)
+	defer os.RemoveAll(td)
+	defer testChdir(t, td)()
+
+	ui := new(cli.MockUi)
+	c := &InitCommand{
+		Meta: Meta{
+			testingOverrides: metaOverridesForProvider(testProvider()),
+			Ui:               ui,
+		},
+	}
+
+	args := []string{"-backend-config", "path=test"}
+	if code := c.Run(args); code != 0 {
+		t.Fatalf("bad: \n%s", ui.ErrorWriter.String())
+	}
+
+	ui = new(cli.MockUi)
+	c = &InitCommand{
+		Meta: Meta{
+			testingOverrides: metaOverridesForProvider(testProvider()),
+			Ui:               ui,
+		},
+	}
+
+	// a second init should require no changes, nor should it change the backend.
+	args = []string{"-input=false"}
+	if code := c.Run(args); code != 0 {
+		t.Fatalf("bad: \n%s", ui.ErrorWriter.String())
+	}
+
+	// make sure the backend is configured how we expect
+	configState := testDataStateRead(t, filepath.Join(DefaultDataDir, DefaultStateFilename))
+	cfg := map[string]interface{}{}
+	if err := json.Unmarshal(configState.Backend.ConfigRaw, &cfg); err != nil {
+		t.Fatal(err)
+	}
+	if cfg["path"] != "test" {
+		t.Fatalf(`expected backend path="test", got path="%v"`, cfg["path"])
+	}
+}
+
 func TestInit_targetSubdir(t *testing.T) {
 	// Create a temporary working directory that is empty
 	td := tempDir(t)

command/meta_backend.go

@@ -823,6 +823,8 @@ func (m *Meta) backend_C_r_S_changed(c *configs.Backend, cHash int, sMgr *state.
 		return nil, diags
 	}
 
+	fmt.Println("HERE")
+
 	// Perform the migration
 	err := m.backendMigrateState(&backendMigrateOpts{
 		OneType: s.Backend.Type,

command/meta_backend_migrate.go

@@ -98,6 +98,7 @@ func (m *Meta) backendMigrateState(opts *backendMigrateOpts) error {
 	// Multi-state to multi-state. We merge the states together (migrating
 	// each from the source to the destination one by one).
 	case !oneSingle && !twoSingle:
+		fmt.Printf("STATES: %q\n", oneStates)
 		// If the source only has one state and it is the default,
 		// treat it as if it doesn't support multi-state.
 		if len(oneStates) == 1 && oneStates[0] == backend.DefaultStateName {