command/show: improvements to json output (#20139)

* command/show: add support for -json output for state

* command/jsonconfig: do not marshal empty count/for each expressions

* command/jsonstate: continue gracefully if the terraform version is somehow missing from state

command/jsonconfig/config.go

@@ -41,8 +41,8 @@ type module struct {
 type moduleCall struct {
 	ResolvedSource    string                 `json:"resolved_source,omitempty"`
 	Expressions       map[string]interface{} `json:"expressions,omitempty"`
-	CountExpression   expression             `json:"count_expression,omitempty"`
+	CountExpression   *expression            `json:"count_expression,omitempty"`
-	ForEachExpression expression             `json:"for_each_expression,omitempty"`
+	ForEachExpression *expression            `json:"for_each_expression,omitempty"`
 	Module            module                 `json:"module,omitempty"`
 }
 
@@ -76,8 +76,8 @@ type resource struct {
 	// CountExpression and ForEachExpression describe the expressions given for
 	// the corresponding meta-arguments in the resource configuration block.
 	// These are omitted if the corresponding argument isn't set.
-	CountExpression   expression `json:"count_expression,omitempty"`
+	CountExpression   *expression `json:"count_expression,omitempty"`
-	ForEachExpression expression `json:"for_each_expression,omitempty"`
+	ForEachExpression *expression `json:"for_each_expression,omitempty"`
 }
 
 type configOutput struct {
@@ -169,11 +169,11 @@ func marshalModuleCalls(c *configs.Config, schemas *terraform.Schemas) []moduleC
 		}
 		cExp := marshalExpression(v.Count)
 		if !cExp.Empty() {
-			mc.CountExpression = cExp
+			mc.CountExpression = &cExp
 		} else {
 			fExp := marshalExpression(v.ForEach)
 			if !fExp.Empty() {
-				mc.ForEachExpression = fExp
+				mc.ForEachExpression = &fExp
 			}
 		}
 
@@ -219,11 +219,11 @@ func marshalResources(resources map[string]*configs.Resource, schemas *terraform
 
 		cExp := marshalExpression(v.Count)
 		if !cExp.Empty() {
-			r.CountExpression = cExp
+			r.CountExpression = &cExp
 		} else {
 			fExp := marshalExpression(v.ForEach)
 			if !fExp.Empty() {
-				r.ForEachExpression = fExp
+				r.ForEachExpression = &fExp
 			}
 		}
 

command/jsonstate/state.go

@@ -119,8 +119,9 @@ func Marshal(sf *statefile.File, schemas *terraform.Schemas) ([]byte, error) {
 	}
 
 	output := newState()
+	if sf.TerraformVersion != nil {
 		output.TerraformVersion = sf.TerraformVersion.String()
-
+	}
 	// output.StateValues
 	err := output.marshalStateValues(sf.State, schemas)
 	if err != nil {

command/show.go

@@ -8,6 +8,7 @@ import (
 	"github.com/hashicorp/terraform/backend"
 	"github.com/hashicorp/terraform/command/format"
 	"github.com/hashicorp/terraform/command/jsonplan"
+	"github.com/hashicorp/terraform/command/jsonstate"
 	"github.com/hashicorp/terraform/plans"
 	"github.com/hashicorp/terraform/plans/planfile"
 	"github.com/hashicorp/terraform/states/statefile"
@@ -29,7 +30,7 @@ func (c *ShowCommand) Run(args []string) int {
 
 	cmdFlags := c.Meta.defaultFlagSet("show")
 	var jsonOutput bool
-	cmdFlags.BoolVar(&jsonOutput, "json", false, "produce JSON output (only available when showing a planfile)")
+	cmdFlags.BoolVar(&jsonOutput, "json", false, "produce JSON output")
 	cmdFlags.Usage = func() { c.Ui.Error(c.Help()) }
 	if err := cmdFlags.Parse(args); err != nil {
 		return 1
@@ -110,11 +111,6 @@ func (c *ShowCommand) Run(args []string) int {
 		path := args[0]
 		plan, planErr = getPlanFromPath(path)
 		if planErr != nil {
-			// json output is only supported for plans
-			if jsonOutput == true {
-				c.Ui.Error("Error: JSON output not available for state")
-				return 1
-			}
 			stateFile, stateErr = getStateFromPath(path)
 			if stateErr != nil {
 				c.Ui.Error(fmt.Sprintf(
@@ -162,11 +158,21 @@ func (c *ShowCommand) Run(args []string) int {
 		return 0
 	}
 
+	if jsonOutput == true {
+		jsonState, err := jsonstate.Marshal(stateFile, schemas)
+		if err != nil {
+			c.Ui.Error(fmt.Sprintf("Failed to marshal state to json: %s", err))
+			return 1
+		}
+		c.Ui.Output(string(jsonState))
+	} else {
 		c.Ui.Output(format.State(&format.StateOpts{
 			State:   stateFile.State,
 			Color:   c.Colorize(),
 			Schemas: schemas,
 		}))
+	}
+
 	return 0
 }
 

command/show_test.go

@@ -36,27 +36,6 @@ func TestShow(t *testing.T) {
 	}
 }
 
-func TestShow_JSONStateNotImplemented(t *testing.T) {
-	// Create the default state
-	statePath := testStateFile(t, testState())
-	defer testChdir(t, filepath.Dir(statePath))()
-	ui := new(cli.MockUi)
-	c := &ShowCommand{
-		Meta: Meta{
-			testingOverrides: metaOverridesForProvider(testProvider()),
-			Ui:               ui,
-		},
-	}
-
-	args := []string{
-		"-json",
-		statePath,
-	}
-	if code := c.Run(args); code != 1 {
-		t.Fatalf("bad: \n%s", ui.OutputWriter.String())
-	}
-}
-
 func TestShow_noArgs(t *testing.T) {
 	// Create the default state
 	statePath := testStateFile(t, testState())