Fix crash for outputs of type Object (#7353), and support bool and int outputs

Included in this fix:
1) No crash
2) Debug log indicates problem, otherwise unsupported outputs are ignored
3) String, bool and int outputs are supported
4) Documentation indicates these limitations
What is not included:
5) Array, object, securestring, secureobject still not supported

builtin/providers/azurerm/resource_arm_template_deployment.go

@@ -155,20 +155,44 @@ func resourceArmTemplateDeploymentRead(d *schema.ResourceData, meta interface{})
 	if resp.Properties.Outputs != nil && len(*resp.Properties.Outputs) > 0 {
 		outputs = make(map[string]string)
 		for key, output := range *resp.Properties.Outputs {
+			log.Printf("[DEBUG] Processing deployment output %s", key)
 			outputMap := output.(map[string]interface{})
 			outputValue, ok := outputMap["value"]
 			if !ok {
 				// No value
 				continue
 			}
+			outputType := outputMap["type"]
+			var outputStringValue string
+
+			switch outputType {
+			case "Bool":
+				if outputValue == false {
+					outputStringValue = "0"
+				} else if outputValue == true {
+					outputStringValue = "1"
+				} else {
+					return fmt.Errorf("Invalid value %s for boolean output %s", outputValue, key)
+				}
+
+			case "String": // Nothing to do
+				fallthrough
+			case "Int":
+				outputStringValue = fmt.Sprint(outputValue)
+
+			case "SecureString", "Object", "SecureObject", "Array":
+				fallthrough
+			default:
+				log.Printf("[WARNING] Ignoring output %s: Outputs of type %s are not currently supported in azurerm_deployment_template.",
+					key, outputType)
+				continue
+			}
 
-			outputs[key] = outputValue.(string)
+			outputs[key] = outputStringValue
 		}
 	}
 
-	d.Set("outputs", outputs)
-
-	return nil
+	return d.Set("outputs", outputs)
 }
 
 func resourceArmTemplateDeploymentDelete(d *schema.ResourceData, meta interface{}) error {

builtin/providers/azurerm/resource_arm_template_deployment_test.go

@@ -68,6 +68,29 @@ func TestAccAzureRMTemplateDeployment_withParams(t *testing.T) {
 	})
 }
 
+func TestAccAzureRMTemplateDeployment_withOutputs(t *testing.T) {
+	ri := acctest.RandInt()
+	config := fmt.Sprintf(testAccAzureRMTemplateDeployment_withOutputs, ri, ri, ri)
+	resource.Test(t, resource.TestCase{
+		PreCheck:     func() { testAccPreCheck(t) },
+		Providers:    testAccProviders,
+		CheckDestroy: testCheckAzureRMTemplateDeploymentDestroy,
+		Steps: []resource.TestStep{
+			{
+				Config: config,
+				Check: resource.ComposeTestCheckFunc(
+					testCheckAzureRMTemplateDeploymentExists("azurerm_template_deployment.test"),
+					resource.TestCheckOutput("tfIntOutput", "-123"),
+					resource.TestCheckOutput("tfStringOutput", "Standard_GRS"),
+					resource.TestCheckOutput("tfFalseOutput", "0"),
+					resource.TestCheckOutput("tfTrueOutput", "1"),
+					resource.TestCheckResourceAttr("azurerm_template_deployment.test", "outputs.stringOutput", "Standard_GRS"),
+				),
+			},
+		},
+	})
+}
+
 func TestAccAzureRMTemplateDeployment_withError(t *testing.T) {
 	ri := acctest.RandInt()
 	config := fmt.Sprintf(testAccAzureRMTemplateDeployment_withError, ri, ri)
@@ -352,6 +375,126 @@ DEPLOY
 
 `
 
+var testAccAzureRMTemplateDeployment_withOutputs = `
+  resource "azurerm_resource_group" "test" {
+    name = "acctestRG-%d"
+    location = "West US"
+  }
+
+  output "tfStringOutput" {
+    value = "${azurerm_template_deployment.test.outputs.stringOutput}"
+  }
+
+  output "tfIntOutput" {
+    value = "${azurerm_template_deployment.test.outputs.intOutput}"
+  }
+
+  output "tfFalseOutput" {
+    value = "${azurerm_template_deployment.test.outputs.falseOutput}"
+  }
+
+  output "tfTrueOutput" {
+    value = "${azurerm_template_deployment.test.outputs.trueOutput}"
+  }
+
+  resource "azurerm_template_deployment" "test" {
+    name = "acctesttemplate-%d"
+    resource_group_name = "${azurerm_resource_group.test.name}"
+    template_body = <<DEPLOY
+{
+  "$schema": "https://schema.management.azure.com/schemas/2015-01-01/deploymentTemplate.json#",
+  "contentVersion": "1.0.0.0",
+  "parameters": {
+    "storageAccountType": {
+      "type": "string",
+      "defaultValue": "Standard_LRS",
+      "allowedValues": [
+        "Standard_LRS",
+        "Standard_GRS",
+        "Standard_ZRS"
+      ],
+      "metadata": {
+        "description": "Storage Account type"
+      }
+    },
+    "dnsLabelPrefix": {
+      "type": "string",
+      "metadata": {
+        "description": "DNS Label for the Public IP. Must be lowercase. It should match with the following regular expression: ^[a-z][a-z0-9-]{1,61}[a-z0-9]$ or it will raise an error."
+      }
+    },
+    "intParameter": {
+      "type": "int",
+      "defaultValue": -123
+    },
+    "falseParameter": {
+      "type": "bool",
+      "defaultValue": false
+    },
+    "trueParameter": {
+      "type": "bool",
+      "defaultValue": true
+    }
+  },
+  "variables": {
+    "location": "[resourceGroup().location]",
+    "storageAccountName": "[concat(uniquestring(resourceGroup().id), 'storage')]",
+    "publicIPAddressName": "[concat('myPublicIp', uniquestring(resourceGroup().id))]",
+    "publicIPAddressType": "Dynamic",
+    "apiVersion": "2015-06-15"
+  },
+  "resources": [
+    {
+      "type": "Microsoft.Storage/storageAccounts",
+      "name": "[variables('storageAccountName')]",
+      "apiVersion": "[variables('apiVersion')]",
+      "location": "[variables('location')]",
+      "properties": {
+        "accountType": "[parameters('storageAccountType')]"
+      }
+    },
+    {
+      "type": "Microsoft.Network/publicIPAddresses",
+      "apiVersion": "[variables('apiVersion')]",
+      "name": "[variables('publicIPAddressName')]",
+      "location": "[variables('location')]",
+      "properties": {
+        "publicIPAllocationMethod": "[variables('publicIPAddressType')]",
+        "dnsSettings": {
+          "domainNameLabel": "[parameters('dnsLabelPrefix')]"
+        }
+      }
+    }
+  ],
+  "outputs": {
+    "stringOutput": {
+      "type": "string",
+      "value": "[parameters('storageAccountType')]"
+    },
+    "intOutput": {
+      "type": "int",
+      "value": "[parameters('intParameter')]"
+    },
+    "falseOutput": {
+      "type": "bool",
+      "value": "[parameters('falseParameter')]"
+    },
+    "trueOutput": {
+      "type": "bool",
+      "value": "[parameters('trueParameter')]"
+    }
+  }
+}
+DEPLOY
+    parameters {
+      dnsLabelPrefix = "terraform-test-%d"
+      storageAccountType = "Standard_GRS"
+    }
+    deployment_mode = "Incremental"
+  }
+
+`
+
 // StorageAccount name is too long, forces error
 var testAccAzureRMTemplateDeployment_withError = `
   resource "azurerm_resource_group" "test" {

website/source/docs/providers/azurerm/r/template_deployment.html.markdown

@@ -98,6 +98,7 @@ The following arguments are supported:
 The following attributes are exported:
 
 * `id` - The Template Deployment ID.
+* `outputs` - A map of supported scalar output types returned from the deployment (currently, Azure template outputs of type String, Int and Bool are supported, and are converted to strings - others will be ignored).
 
 ## Note