Implements import with specified provider

This allows the import with a specified provider.
So far it was not possible to get resources imported from a different provider
than the default.

command/import.go

@@ -32,6 +32,7 @@ func (c *ImportCommand) Run(args []string) int {
 	cmdFlags.StringVar(&c.Meta.stateOutPath, "state-out", "", "path")
 	cmdFlags.StringVar(&c.Meta.backupPath, "backup", "", "path")
 	cmdFlags.StringVar(&configPath, "config", pwd, "path")
+	cmdFlags.StringVar(&c.Meta.provider, "provider", "", "provider")
 	cmdFlags.Usage = func() { c.Ui.Error(c.Help()) }
 	if err := cmdFlags.Parse(args); err != nil {
 		return 1
@@ -64,6 +65,7 @@ func (c *ImportCommand) Run(args []string) int {
 			&terraform.ImportTarget{
 				Addr:     args[0],
 				ID:       args[1],
+				Provider: c.Meta.provider,
 			},
 		},
 	})
@@ -138,6 +140,8 @@ Options:
   -state-out=path     Path to write updated state file. By default, the
                       "-state" path will be used.
 
+  -provider=provider  Provider used for import. Defaults to: ""
+
 `
 	return strings.TrimSpace(helpText)
 }

command/import_test.go

@@ -844,8 +844,53 @@ func TestRefresh_displaysOutputs(t *testing.T) {
 }
 */
 
+func TestImport_customProvider(t *testing.T) {
+	statePath := testTempFile(t)
+
+	p := testProvider()
+	ui := new(cli.MockUi)
+	c := &ImportCommand{
+		Meta: Meta{
+			ContextOpts: testCtxConfig(p),
+			Ui:          ui,
+		},
+	}
+
+	p.ImportStateFn = nil
+	p.ImportStateReturn = []*terraform.InstanceState{
+		&terraform.InstanceState{
+			ID: "yay",
+			Ephemeral: terraform.EphemeralState{
+				Type: "test_instance",
+			},
+		},
+	}
+
+	args := []string{
+		"-provider", "test.alias",
+		"-state", statePath,
+		"test_instance.foo",
+		"bar",
+	}
+	if code := c.Run(args); code != 0 {
+		t.Fatalf("bad: %d\n\n%s", code, ui.ErrorWriter.String())
+	}
+
+	if !p.ImportStateCalled {
+		t.Fatal("ImportState should be called")
+	}
+
+	testStateOutput(t, statePath, testImportCustomProviderStr)
+}
+
 const testImportStr = `
 test_instance.foo:
   ID = yay
   provider = test
 `
+
+const testImportCustomProviderStr = `
+test_instance.foo:
+  ID = yay
+  provider = test.alias
+`

command/meta.go

@@ -72,11 +72,14 @@ type Meta struct {
 	// allowed when walking the graph
 	//
 	// shadow is used to enable/disable the shadow graph
+	//
+	// provider is to specify specific resource providers
 	statePath    string
 	stateOutPath string
 	backupPath   string
 	parallelism  int
 	shadow       bool
+	provider     string
 }
 
 // initStatePaths is used to initialize the default values for

terraform/context_import.go

@@ -23,6 +23,9 @@ type ImportTarget struct {
 
 	// ID is the ID of the resource to import. This is resource-specific.
 	ID string
+
+	// Provider string
+	Provider string
 }
 
 // Import takes already-created external resources and brings them

terraform/context_import_test.go

@@ -1,3 +1,4 @@
+// TODO
 package terraform
 
 import (
@@ -32,7 +33,6 @@ func TestContextImport_basic(t *testing.T) {
 	if err != nil {
 		t.Fatalf("err: %s", err)
 	}
-
 	actual := strings.TrimSpace(state.String())
 	expected := strings.TrimSpace(testImportStr)
 	if actual != expected {
@@ -621,6 +621,41 @@ func TestContextImport_multiStateSame(t *testing.T) {
 	}
 }
 
+func TestContextImport_customProvider(t *testing.T) {
+	p := testProvider("aws")
+	ctx := testContext2(t, &ContextOpts{
+		Providers: map[string]ResourceProviderFactory{
+			"aws": testProviderFuncFixed(p),
+		},
+	})
+
+	p.ImportStateReturn = []*InstanceState{
+		&InstanceState{
+			ID:        "foo",
+			Ephemeral: EphemeralState{Type: "aws_instance"},
+		},
+	}
+
+	state, err := ctx.Import(&ImportOpts{
+		Targets: []*ImportTarget{
+			&ImportTarget{
+				Addr:     "aws_instance.foo",
+				ID:       "bar",
+				Provider: "aws.alias",
+			},
+		},
+	})
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	actual := strings.TrimSpace(state.String())
+	expected := strings.TrimSpace(testImportCustomProviderStr)
+	if actual != expected {
+		t.Fatalf("bad: \n%s", actual)
+	}
+}
+
 const testImportStr = `
 aws_instance.foo:
   ID = foo
@@ -700,3 +735,9 @@ aws_instance.foo:
   provider = aws
   foo = bar
 `
+
+const testImportCustomProviderStr = `
+aws_instance.foo:
+  ID = foo
+  provider = aws.alias
+`

terraform/transform_import_state.go

@@ -23,6 +23,7 @@ func (t *ImportStateTransformer) Transform(g *Graph) error {
 		nodes = append(nodes, &graphNodeImportState{
 			Addr:     addr,
 			ID:       target.ID,
+			Provider: target.Provider,
 		})
 	}
 
@@ -37,6 +38,7 @@ func (t *ImportStateTransformer) Transform(g *Graph) error {
 type graphNodeImportState struct {
 	Addr     *ResourceAddress // Addr is the resource address to import to
 	ID       string           // ID is the ID to import as
+	Provider string           // Provider string
 
 	states []*InstanceState
 }
@@ -46,7 +48,7 @@ func (n *graphNodeImportState) Name() string {
 }
 
 func (n *graphNodeImportState) ProvidedBy() []string {
-	return []string{resourceProvider(n.Addr.Type, "")}
+	return []string{resourceProvider(n.Addr.Type, n.Provider)}
 }
 
 // GraphNodeSubPath
@@ -150,6 +152,7 @@ func (n *graphNodeImportState) DynamicExpand(ctx EvalContext) (*Graph, error) {
 			Target:   addrs[i],
 			Path_:    n.Path(),
 			State:    state,
+			Provider: n.Provider,
 		})
 	}
 
@@ -170,6 +173,7 @@ type graphNodeImportStateSub struct {
 	Target   *ResourceAddress
 	State    *InstanceState
 	Path_    []string
+	Provider string
 }
 
 func (n *graphNodeImportStateSub) Name() string {
@@ -212,7 +216,7 @@ func (n *graphNodeImportStateSub) EvalTree() EvalNode {
 	return &EvalSequence{
 		Nodes: []EvalNode{
 			&EvalGetProvider{
-				Name:   resourceProvider(info.Type, ""),
+				Name:   resourceProvider(info.Type, n.Provider),
 				Output: &provider,
 			},
 			&EvalRefresh{
@@ -229,7 +233,7 @@ func (n *graphNodeImportStateSub) EvalTree() EvalNode {
 			&EvalWriteState{
 				Name:         key.String(),
 				ResourceType: info.Type,
-				Provider:     resourceProvider(info.Type, ""),
+				Provider:     resourceProvider(info.Type, n.Provider),
 				State:        &state,
 			},
 		},

website/source/docs/commands/import.html.md

@@ -49,6 +49,9 @@ The command-line flags are all optional. The list of available flags are:
   the state path. Ignored when [remote state](/docs/state/remote/index.html) is
   used.
 
+* `-provider=provider` - Provider used for import. Defaults to the default
+  provider of the resource to import.
+
 ## Provider Configuration
 
 Terraform will attempt to load configuration files that configure the