command/import: fix error during import when implied provider was not used (#22855)

* command/import: properly use `-provider` supplied on the command line

The import command now attaches the provider configuration in the resource
instance, if set. That config is attached to the NodeAbstractResource
during the import graph building. This prevents errors when the implied
provider is not actually in the configuration at all, which may happen
when a configuration is using the `-beta` version of a provider (and
only that `-beta` version).

* command/import: fix variable reassignment and update docs

Fixes #22564

command/import.go

@@ -178,7 +178,11 @@ func (c *ImportCommand) Run(args []string) int {
 		// We assume the same module as the resource address here, which
 		// may get resolved to an inherited provider when we construct the
 		// import graph inside ctx.Import, called below.
-		providerAddr = resourceRelAddr.DefaultProviderConfig().Absolute(addr.Module)
+		if rc != nil && rc.ProviderConfigRef != nil {
+			providerAddr = rc.ProviderConfigAddr().Absolute(addr.Module)
+		} else {
+			providerAddr = resourceRelAddr.DefaultProviderConfig().Absolute(addr.Module)
+		}
 	}
 
 	// Check for user-supplied plugin path
@@ -336,9 +340,10 @@ Options:
 
   -no-color               If specified, output won't contain any color.
 
-  -provider=provider      Specific provider to use for import. This is used for
-                          specifying aliases, such as "aws.eu". Defaults to the
-                          normal provider prefix of the resource being imported.
+  -provider=provider      Deprecated: Override the provider configuration to use
+                          when importing the object. By default, Terraform uses the
+                          provider specified in the configuration for the target
+                          resource, and that is the best behavior in most cases.
 
   -state=PATH             Path to the source state file. Defaults to the configured
                           backend, or "terraform.tfstate"

command/import_test.go

@@ -536,6 +536,99 @@ func TestImport_customProvider(t *testing.T) {
 	testStateOutput(t, statePath, testImportCustomProviderStr)
 }
 
+// This tests behavior when the provider name does not match the implied
+// provider name
+func TestImport_providerNameMismatch(t *testing.T) {
+	defer testChdir(t, testFixturePath("import-provider-mismatch"))()
+
+	statePath := testTempFile(t)
+
+	p := testProvider()
+	ui := new(cli.MockUi)
+	c := &ImportCommand{
+		Meta: Meta{
+			testingOverrides: &testingOverrides{
+				ProviderResolver: providers.ResolverFixed(
+					map[string]providers.Factory{
+						"test-beta": providers.FactoryFixed(p),
+					},
+				),
+			},
+			Ui: ui,
+		},
+	}
+
+	configured := false
+	p.ConfigureNewFn = func(req providers.ConfigureRequest) providers.ConfigureResponse {
+		configured = true
+
+		cfg := req.Config
+		if !cfg.Type().HasAttribute("foo") {
+			return providers.ConfigureResponse{
+				Diagnostics: tfdiags.Diagnostics{}.Append(fmt.Errorf("configuration has no foo argument")),
+			}
+		}
+		if got, want := cfg.GetAttr("foo"), cty.StringVal("baz"); !want.RawEquals(got) {
+			return providers.ConfigureResponse{
+				Diagnostics: tfdiags.Diagnostics{}.Append(fmt.Errorf("foo argument is %#v, but want %#v", got, want)),
+			}
+		}
+
+		return providers.ConfigureResponse{}
+	}
+
+	p.ImportResourceStateFn = nil
+	p.ImportResourceStateResponse = providers.ImportResourceStateResponse{
+		ImportedResources: []providers.ImportedResource{
+			{
+				TypeName: "test_instance",
+				State: cty.ObjectVal(map[string]cty.Value{
+					"id": cty.StringVal("yay"),
+				}),
+			},
+		},
+	}
+	p.GetSchemaReturn = &terraform.ProviderSchema{
+		Provider: &configschema.Block{
+			Attributes: map[string]*configschema.Attribute{
+				"foo": {Type: cty.String, Optional: true},
+			},
+		},
+		ResourceTypes: map[string]*configschema.Block{
+			"test_instance": {
+				Attributes: map[string]*configschema.Attribute{
+					"id": {Type: cty.String, Optional: true, Computed: true},
+				},
+			},
+		},
+	}
+
+	args := []string{
+		"-provider", "test-beta",
+		"-state", statePath,
+		"test_instance.foo",
+		"bar",
+	}
+
+	if code := c.Run(args); code != 0 {
+		t.Fatalf("bad: %d\n\n%s", code, ui.ErrorWriter.String())
+	}
+
+	// Verify that the test-beta provider was configured
+	if !configured {
+		t.Fatal("Configure should be called")
+	}
+
+	if !p.ImportResourceStateCalled {
+		t.Fatal("ImportResourceState (provider 'test-beta') should be called")
+	}
+
+	if !p.ReadResourceCalled {
+		t.Fatal("ReadResource (provider 'test-beta' should be called")
+	}
+
+	testStateOutput(t, statePath, testImportProviderMismatchStr)
+}
 func TestImport_allowMissingResourceConfig(t *testing.T) {
 	defer testChdir(t, testFixturePath("import-missing-resource-config"))()
 
@@ -845,3 +938,9 @@ test_instance.foo:
   ID = yay
   provider = provider.test.alias
 `
+
+const testImportProviderMismatchStr = `
+test_instance.foo:
+  ID = yay
+  provider = provider.test-beta
+`

command/testdata/import-provider-mismatch/main.tf

@@ -0,0 +1,7 @@
+provider "test-beta" {
+  foo = "baz"
+}
+
+resource "test_instance" "foo" {
+  provider = "test-beta"
+}

terraform/graph_builder_import.go

@@ -55,6 +55,9 @@ func (b *ImportGraphBuilder) Steps() []GraphTransformer {
 		// Create all our resources from the configuration and state
 		&ConfigTransformer{Config: config},
 
+		// Attach the configuration to any resources
+		&AttachResourceConfigTransformer{Config: b.Config},
+
 		// Add the import steps
 		&ImportStateTransformer{Targets: b.ImportTargets},
 

website/docs/commands/import.html.md

@@ -52,10 +52,9 @@ The command-line flags are all optional. The list of available flags are:
   [walks the graph](/docs/internals/graph.html#walking-the-graph). Defaults
   to 10.
 
-* `-provider=provider` - Specified provider to use for import. The value should be a provider
-  alias in the form `TYPE.ALIAS`, such as "aws.eu". This defaults to the normal
-  provider based on the prefix of the resource being imported. You usually
-  don't need to specify this.
+* `-provider=provider` - **Deprecated** Override the provider configuration to
+use when importing the object. By default, Terraform uses the provider specified
+in the configuration for the target resource, and that is the best behavior in most cases.
 
 * `-state=path` - Path to the source state file to read from. Defaults to the
   configured backend, or "terraform.tfstate".