Add checks for all flags we currently don’t support

For Plan only:
-module-depth=n

For Plan & Apply
-parallelism=m
-refresh=false
-var “foo=bar” and -var-file=foo

backend/backend.go

@@ -137,11 +137,13 @@ type Operation struct {
 
 	// The options below are more self-explanatory and affect the runtime
 	// behavior of the operation.
+	AutoApprove  bool
 	Destroy      bool
+	DestroyForce bool
+	ModuleDepth  int
+	Parallelism  int
 	Targets      []string
 	Variables    map[string]interface{}
-	AutoApprove  bool
-	DestroyForce bool
 
 	// Input/output/control options.
 	UIIn  terraform.UIInput

backend/remote/backend.go

@@ -24,8 +24,10 @@ import (
 )
 
 const (
-	defaultHostname = "app.terraform.io"
-	serviceID       = "tfe.v2"
+	defaultHostname    = "app.terraform.io"
+	defaultModuleDepth = -1
+	defaultParallelism = 10
+	serviceID          = "tfe.v2"
 )
 
 // Remote is an implementation of EnhancedBackend that performs all

backend/remote/backend_apply.go

@@ -31,14 +31,27 @@ func (b *Remote) opApply(stopCtx, cancelCtx context.Context, op *backend.Operati
 		return nil, fmt.Errorf(strings.TrimSpace(applyErrVCSNotSupported))
 	}
 
+	if op.Parallelism != defaultParallelism {
+		return nil, fmt.Errorf(strings.TrimSpace(applyErrParallelismNotSupported))
+	}
+
 	if op.Plan != nil {
 		return nil, fmt.Errorf(strings.TrimSpace(applyErrPlanNotSupported))
 	}
 
+	if !op.PlanRefresh {
+		return nil, fmt.Errorf(strings.TrimSpace(applyErrNoRefreshNotSupported))
+	}
+
 	if op.Targets != nil {
 		return nil, fmt.Errorf(strings.TrimSpace(applyErrTargetsNotSupported))
 	}
 
+	if op.Variables != nil {
+		return nil, fmt.Errorf(strings.TrimSpace(
+			fmt.Sprintf(applyErrVariablesNotSupported, b.hostname, b.organization, op.Workspace)))
+	}
+
 	if (op.Module == nil || op.Module.Config().Dir == "") && !op.Destroy {
 		return nil, fmt.Errorf(strings.TrimSpace(applyErrNoConfig))
 	}
@@ -96,7 +109,7 @@ func (b *Remote) opApply(stopCtx, cancelCtx context.Context, op *backend.Operati
 			}
 		}
 		return r, fmt.Errorf(strings.TrimSpace(
-			fmt.Sprint(applyErrNoApplyRights, b.hostname, b.organization, op.Workspace)))
+			fmt.Sprintf(applyErrNoApplyRights, b.hostname, b.organization, op.Workspace)))
 	}
 
 	hasUI := op.UIIn != nil && op.UIOut != nil
@@ -286,11 +299,25 @@ A workspace that is connected to a VCS requires the VCS-driven workflow
 to ensure that the VCS remains the single source of truth.
 `
 
+const applyErrParallelismNotSupported = `
+Custom parallelism values are currently not supported!
+
+The "remote" backend does not support setting a custom parallelism
+value at this time.
+`
+
 const applyErrPlanNotSupported = `
 Applying a saved plan is currently not supported!
 
-The "remote" backend currently requires configuration to be present
-and does not accept an existing saved plan as an argument at this time.
+The "remote" backend currently requires configuration to be present and
+does not accept an existing saved plan as an argument at this time.
+`
+
+const applyErrNoRefreshNotSupported = `
+Applying without refresh is currently not supported!
+
+Currently the "remote" backend will always do an in-memory refresh of
+the Terraform state prior to generating the plan.
 `
 
 const applyErrTargetsNotSupported = `
@@ -299,6 +326,19 @@ Resource targeting is currently not supported!
 The "remote" backend does not support resource targeting at this time.
 `
 
+const applyErrVariablesNotSupported = `
+Run variables are currently not supported!
+
+The "remote" backend does not support setting run variables at this time.
+Currently the only to way to pass variables to the remote backend is by
+creating a '*.auto.tfvars' variables file. This file will automatically
+be loaded by the "remote" backend when the workspace is configured to use
+Terraform v0.10.0 or later.
+
+Additionally you can also set variables on the workspace in the web UI:
+https://%s/app/%s/%s/variables
+`
+
 const applyErrNoConfig = `
 No configuration files found!
 

backend/remote/backend_apply_test.go

@@ -18,7 +18,9 @@ import (
 
 func testOperationApply() *backend.Operation {
 	return &backend.Operation{
-		Type: backend.OperationTypeApply,
+		Parallelism: defaultParallelism,
+		PlanRefresh: true,
+		Type:        backend.OperationTypeApply,
 	}
 }
 
@@ -135,6 +137,31 @@ func TestRemote_applyWithVCS(t *testing.T) {
 	}
 }
 
+func TestRemote_applyWithParallelism(t *testing.T) {
+	b := testBackendDefault(t)
+
+	mod, modCleanup := module.TestTree(t, "./test-fixtures/apply")
+	defer modCleanup()
+
+	op := testOperationApply()
+	op.Module = mod
+	op.Parallelism = 3
+	op.Workspace = backend.DefaultStateName
+
+	run, err := b.Operation(context.Background(), op)
+	if err != nil {
+		t.Fatalf("error starting operation: %v", err)
+	}
+	<-run.Done()
+
+	if run.Err == nil {
+		t.Fatalf("expected an apply error, got: %v", run.Err)
+	}
+	if !strings.Contains(run.Err.Error(), "parallelism values are currently not supported") {
+		t.Fatalf("expected a parallelism error, got: %v", run.Err)
+	}
+}
+
 func TestRemote_applyWithPlan(t *testing.T) {
 	b := testBackendDefault(t)
 
@@ -160,6 +187,31 @@ func TestRemote_applyWithPlan(t *testing.T) {
 	}
 }
 
+func TestRemote_applyWithoutRefresh(t *testing.T) {
+	b := testBackendDefault(t)
+
+	mod, modCleanup := module.TestTree(t, "./test-fixtures/apply")
+	defer modCleanup()
+
+	op := testOperationApply()
+	op.Module = mod
+	op.PlanRefresh = false
+	op.Workspace = backend.DefaultStateName
+
+	run, err := b.Operation(context.Background(), op)
+	if err != nil {
+		t.Fatalf("error starting operation: %v", err)
+	}
+	<-run.Done()
+
+	if run.Err == nil {
+		t.Fatalf("expected an apply error, got: %v", run.Err)
+	}
+	if !strings.Contains(run.Err.Error(), "refresh is currently not supported") {
+		t.Fatalf("expected a refresh error, got: %v", run.Err)
+	}
+}
+
 func TestRemote_applyWithTarget(t *testing.T) {
 	b := testBackendDefault(t)
 
@@ -185,6 +237,31 @@ func TestRemote_applyWithTarget(t *testing.T) {
 	}
 }
 
+func TestRemote_applyWithVariables(t *testing.T) {
+	b := testBackendDefault(t)
+
+	mod, modCleanup := module.TestTree(t, "./test-fixtures/apply")
+	defer modCleanup()
+
+	op := testOperationApply()
+	op.Module = mod
+	op.Variables = map[string]interface{}{"foo": "bar"}
+	op.Workspace = backend.DefaultStateName
+
+	run, err := b.Operation(context.Background(), op)
+	if err != nil {
+		t.Fatalf("error starting operation: %v", err)
+	}
+	<-run.Done()
+
+	if run.Err == nil {
+		t.Fatalf("expected an apply error, got: %v", run.Err)
+	}
+	if !strings.Contains(run.Err.Error(), "variables are currently not supported") {
+		t.Fatalf("expected a variables error, got: %v", run.Err)
+	}
+}
+
 func TestRemote_applyNoConfig(t *testing.T) {
 	b := testBackendDefault(t)
 

backend/remote/backend_plan.go

@@ -30,6 +30,14 @@ func (b *Remote) opPlan(stopCtx, cancelCtx context.Context, op *backend.Operatio
 		return nil, fmt.Errorf(strings.TrimSpace(fmt.Sprintf(planErrNoQueueRunRights)))
 	}
 
+	if op.ModuleDepth != defaultModuleDepth {
+		return nil, fmt.Errorf(strings.TrimSpace(planErrModuleDepthNotSupported))
+	}
+
+	if op.Parallelism != defaultParallelism {
+		return nil, fmt.Errorf(strings.TrimSpace(planErrParallelismNotSupported))
+	}
+
 	if op.Plan != nil {
 		return nil, fmt.Errorf(strings.TrimSpace(planErrPlanNotSupported))
 	}
@@ -38,10 +46,19 @@ func (b *Remote) opPlan(stopCtx, cancelCtx context.Context, op *backend.Operatio
 		return nil, fmt.Errorf(strings.TrimSpace(planErrOutPathNotSupported))
 	}
 
+	if !op.PlanRefresh {
+		return nil, fmt.Errorf(strings.TrimSpace(planErrNoRefreshNotSupported))
+	}
+
 	if op.Targets != nil {
 		return nil, fmt.Errorf(strings.TrimSpace(planErrTargetsNotSupported))
 	}
 
+	if op.Variables != nil {
+		return nil, fmt.Errorf(strings.TrimSpace(
+			fmt.Sprintf(planErrVariablesNotSupported, b.hostname, b.organization, op.Workspace)))
+	}
+
 	if (op.Module == nil || op.Module.Config().Dir == "") && !op.Destroy {
 		return nil, fmt.Errorf(strings.TrimSpace(planErrNoConfig))
 	}
@@ -203,11 +220,25 @@ Insufficient rights to generate a plan!
 to generate plans, at least plan permissions on the workspace are required.[reset]
 `
 
+const planErrModuleDepthNotSupported = `
+Custom module depths are currently not supported!
+
+The "remote" backend does not support setting a custom module
+depth at this time.
+`
+
+const planErrParallelismNotSupported = `
+Custom parallelism values are currently not supported!
+
+The "remote" backend does not support setting a custom parallelism
+value at this time.
+`
+
 const planErrPlanNotSupported = `
 Displaying a saved plan is currently not supported!
 
-The "remote" backend currently requires configuration to be present
-and does not accept an existing saved plan as an argument at this time.
+The "remote" backend currently requires configuration to be present and
+does not accept an existing saved plan as an argument at this time.
 `
 
 const planErrOutPathNotSupported = `
@@ -217,12 +248,32 @@ The "remote" backend does not support saving the generated execution
 plan locally at this time.
 `
 
+const planErrNoRefreshNotSupported = `
+Planning without refresh is currently not supported!
+
+Currently the "remote" backend will always do an in-memory refresh of
+the Terraform state prior to generating the plan.
+`
+
 const planErrTargetsNotSupported = `
 Resource targeting is currently not supported!
 
 The "remote" backend does not support resource targeting at this time.
 `
 
+const planErrVariablesNotSupported = `
+Run variables are currently not supported!
+
+The "remote" backend does not support setting run variables at this time.
+Currently the only to way to pass variables to the remote backend is by
+creating a '*.auto.tfvars' variables file. This file will automatically
+be loaded by the "remote" backend when the workspace is configured to use
+Terraform v0.10.0 or later.
+
+Additionally you can also set variables on the workspace in the web UI:
+https://%s/app/%s/%s/variables
+`
+
 const planErrNoConfig = `
 No configuration files found!
 

backend/remote/backend_plan_test.go

@@ -18,7 +18,10 @@ import (
 
 func testOperationPlan() *backend.Operation {
 	return &backend.Operation{
-		Type: backend.OperationTypePlan,
+		ModuleDepth: defaultModuleDepth,
+		Parallelism: defaultParallelism,
+		PlanRefresh: true,
+		Type:        backend.OperationTypePlan,
 	}
 }
 
@@ -85,6 +88,56 @@ func TestRemote_planWithoutPermissions(t *testing.T) {
 	}
 }
 
+func TestRemote_planWithModuleDepth(t *testing.T) {
+	b := testBackendDefault(t)
+
+	mod, modCleanup := module.TestTree(t, "./test-fixtures/plan")
+	defer modCleanup()
+
+	op := testOperationPlan()
+	op.Module = mod
+	op.ModuleDepth = 1
+	op.Workspace = backend.DefaultStateName
+
+	run, err := b.Operation(context.Background(), op)
+	if err != nil {
+		t.Fatalf("error starting operation: %v", err)
+	}
+	<-run.Done()
+
+	if run.Err == nil {
+		t.Fatalf("expected a plan error, got: %v", run.Err)
+	}
+	if !strings.Contains(run.Err.Error(), "module depths are currently not supported") {
+		t.Fatalf("expected a module depth error, got: %v", run.Err)
+	}
+}
+
+func TestRemote_planWithParallelism(t *testing.T) {
+	b := testBackendDefault(t)
+
+	mod, modCleanup := module.TestTree(t, "./test-fixtures/plan")
+	defer modCleanup()
+
+	op := testOperationPlan()
+	op.Module = mod
+	op.Parallelism = 3
+	op.Workspace = backend.DefaultStateName
+
+	run, err := b.Operation(context.Background(), op)
+	if err != nil {
+		t.Fatalf("error starting operation: %v", err)
+	}
+	<-run.Done()
+
+	if run.Err == nil {
+		t.Fatalf("expected a plan error, got: %v", run.Err)
+	}
+	if !strings.Contains(run.Err.Error(), "parallelism values are currently not supported") {
+		t.Fatalf("expected a parallelism error, got: %v", run.Err)
+	}
+}
+
 func TestRemote_planWithPlan(t *testing.T) {
 	b := testBackendDefault(t)
 
@@ -135,6 +188,31 @@ func TestRemote_planWithPath(t *testing.T) {
 	}
 }
 
+func TestRemote_planWithoutRefresh(t *testing.T) {
+	b := testBackendDefault(t)
+
+	mod, modCleanup := module.TestTree(t, "./test-fixtures/plan")
+	defer modCleanup()
+
+	op := testOperationPlan()
+	op.Module = mod
+	op.PlanRefresh = false
+	op.Workspace = backend.DefaultStateName
+
+	run, err := b.Operation(context.Background(), op)
+	if err != nil {
+		t.Fatalf("error starting operation: %v", err)
+	}
+	<-run.Done()
+
+	if run.Err == nil {
+		t.Fatalf("expected a plan error, got: %v", run.Err)
+	}
+	if !strings.Contains(run.Err.Error(), "refresh is currently not supported") {
+		t.Fatalf("expected a refresh error, got: %v", run.Err)
+	}
+}
+
 func TestRemote_planWithTarget(t *testing.T) {
 	b := testBackendDefault(t)
 
@@ -160,6 +238,31 @@ func TestRemote_planWithTarget(t *testing.T) {
 	}
 }
 
+func TestRemote_planWithVariables(t *testing.T) {
+	b := testBackendDefault(t)
+
+	mod, modCleanup := module.TestTree(t, "./test-fixtures/plan")
+	defer modCleanup()
+
+	op := testOperationPlan()
+	op.Module = mod
+	op.Variables = map[string]interface{}{"foo": "bar"}
+	op.Workspace = backend.DefaultStateName
+
+	run, err := b.Operation(context.Background(), op)
+	if err != nil {
+		t.Fatalf("error starting operation: %v", err)
+	}
+	<-run.Done()
+
+	if run.Err == nil {
+		t.Fatalf("expected an plan error, got: %v", run.Err)
+	}
+	if !strings.Contains(run.Err.Error(), "variables are currently not supported") {
+		t.Fatalf("expected a variables error, got: %v", run.Err)
+	}
+}
+
 func TestRemote_planNoConfig(t *testing.T) {
 	b := testBackendDefault(t)
 

command/apply.go

@@ -147,13 +147,13 @@ func (c *ApplyCommand) Run(args []string) int {
 
 	// Build the operation
 	opReq := c.Operation()
+	opReq.AutoApprove = autoApprove
 	opReq.Destroy = c.Destroy
+	opReq.DestroyForce = destroyForce
 	opReq.Module = mod
 	opReq.Plan = plan
 	opReq.PlanRefresh = refresh
 	opReq.Type = backend.OperationTypeApply
-	opReq.AutoApprove = autoApprove
-	opReq.DestroyForce = destroyForce
 
 	op, err := c.RunOperation(b, opReq)
 	if err != nil {

command/meta_backend.go

@@ -167,9 +167,11 @@ func (m *Meta) IsLocalBackend(b backend.Backend) bool {
 func (m *Meta) Operation() *backend.Operation {
 	return &backend.Operation{
 		PlanOutBackend:   m.backendState,
+		Parallelism:      m.parallelism,
 		Targets:          m.targets,
 		UIIn:             m.UIInput(),
 		UIOut:            m.Ui,
+		Variables:        m.variables,
 		Workspace:        m.Workspace(),
 		LockState:        m.stateLock,
 		StateLockTimeout: m.stateLockTimeout,

command/plan.go

@@ -100,9 +100,10 @@ func (c *PlanCommand) Run(args []string) int {
 	opReq := c.Operation()
 	opReq.Destroy = destroy
 	opReq.Module = mod
+	opReq.ModuleDepth = moduleDepth
 	opReq.Plan = plan
-	opReq.PlanRefresh = refresh
 	opReq.PlanOutPath = outPath
+	opReq.PlanRefresh = refresh
 	opReq.Type = backend.OperationTypePlan
 
 	// Perform the operation