fix for linux function apps

azurerm/internal/services/web/data_source_function_app.go

@@ -2,6 +2,7 @@ package web
 
 import (
 	"fmt"
+	"strings"
 	"time"
 
 	"github.com/hashicorp/terraform-plugin-sdk/helper/schema"
@@ -94,6 +95,11 @@ func dataSourceArmFunctionApp() *schema.Resource {
 				},
 			},
 
+			"os_type": {
+				Type:     schema.TypeString,
+				Computed: true,
+			},
+
 			"outbound_ip_addresses": {
 				Type:     schema.TypeString,
 				Computed: true,
@@ -168,6 +174,12 @@ func dataSourceArmFunctionAppRead(d *schema.ResourceData, meta interface{}) erro
 		d.Set("possible_outbound_ip_addresses", props.PossibleOutboundIPAddresses)
 	}
 
+	osType := ""
+	if v := resp.Kind; v != nil && strings.Contains(*v, "linux") {
+		osType = "linux"
+	}
+	d.Set("os_type", osType)
+
 	appSettings := flattenAppServiceAppSettings(appSettingsResp.Properties)
 
 	if err = d.Set("app_settings", appSettings); err != nil {

azurerm/internal/services/web/resource_arm_function_app.go

@@ -143,6 +143,15 @@ func resourceArmFunctionApp() *schema.Resource {
 				Computed: true,
 			},
 
+			"os_type": {
+				Type:     schema.TypeString,
+				Optional: true,
+				ForceNew: true,
+				ValidateFunc: validation.StringInSlice([]string{
+					"linux",
+				}, false),
+			},
+
 			"outbound_ip_addresses": {
 				Type:     schema.TypeString,
 				Computed: true,
@@ -307,6 +316,13 @@ func resourceArmFunctionAppCreate(d *schema.ResourceData, meta interface{}) erro
 
 	location := azure.NormalizeLocation(d.Get("location").(string))
 	kind := "functionapp"
+	if osTypeRaw, ok := d.GetOk("os_type"); ok {
+		osType := osTypeRaw.(string)
+		if osType == "linux" {
+			kind = "functionapp,linux"
+		}
+	}
+
 	appServicePlanID := d.Get("app_service_plan_id").(string)
 	enabled := d.Get("enabled").(bool)
 	clientAffinityEnabled := d.Get("client_affinity_enabled").(bool)
@@ -394,6 +410,12 @@ func resourceArmFunctionAppUpdate(d *schema.ResourceData, meta interface{}) erro
 
 	location := azure.NormalizeLocation(d.Get("location").(string))
 	kind := "functionapp"
+	if osTypeRaw, ok := d.GetOk("os_type"); ok {
+		osType := osTypeRaw.(string)
+		if osType == "Linux" {
+			kind = "functionapp,linux"
+		}
+	}
 	appServicePlanID := d.Get("app_service_plan_id").(string)
 	enabled := d.Get("enabled").(bool)
 	clientAffinityEnabled := d.Get("client_affinity_enabled").(bool)
@@ -551,6 +573,11 @@ func resourceArmFunctionAppRead(d *schema.ResourceData, meta interface{}) error
 	d.Set("name", name)
 	d.Set("resource_group_name", resGroup)
 	d.Set("kind", resp.Kind)
+	osType := ""
+	if v := resp.Kind; v != nil && strings.Contains(*v, "linux") {
+		osType = "linux"
+	}
+	d.Set("os_type", osType)
 
 	if location := resp.Location; location != nil {
 		d.Set("location", azure.NormalizeLocation(*location))

azurerm/internal/services/web/tests/resource_arm_function_app_test.go

@@ -1165,6 +1165,7 @@ resource "azurerm_function_app" "test" {
   resource_group_name       = "${azurerm_resource_group.test.name}"
   app_service_plan_id       = "${azurerm_app_service_plan.test.id}"
   storage_connection_string = "${azurerm_storage_account.test.primary_connection_string}"
+  os_type                   = "linux"
 
   site_config {
     linux_fx_version = "DOCKER|(golang:latest)"

website/docs/d/function_app.html.markdown

@@ -46,6 +46,10 @@ The following attributes are exported:
 
 * `site_credential` - A `site_credential` block as defined below, which contains the site-level credentials used to publish to this App Service.
 
+* `os_type` - A string indicating the Operating System type for this function app.
+
+~> **NOTE:** This value will be `linux` for Linux Derivatives or an empty string for Windows. 
+
 * `outbound_ip_addresses` - A comma separated list of outbound IP addresses.
 
 * `possible_outbound_ip_addresses` - A comma separated list of outbound IP addresses, not all of which are necessarily in use. Superset of `outbound_ip_addresses`.

website/docs/r/function_app.html.markdown

@@ -109,6 +109,10 @@ The following arguments are supported:
 
 * `connection_string` - (Optional) An `connection_string` block as defined below.
 
+* `os_type` - (Optional) A string indicating the Operating System type for this function app. 
+
+~> **NOTE:** This value will be `linux` for Linux Derivatives or an empty string for Windows (default). 
+
 * `client_affinity_enabled` - (Optional) Should the Function App send session affinity cookies, which route client requests in the same session to the same instance?
 
 * `enabled` - (Optional) Is the Function App enabled?