fix: changed ip detection logic based on review and added initial terraform 0.13 compatibility for the example module

Makefile

@@ -1,8 +1,27 @@
 GOFMT_FILES?=$$(find . -name '*.go' | grep -v vendor)
 NAME=$$(grep TerraformProviderName proxmoxtf/version.go | grep -o -e 'terraform-provider-[a-z]*')
 TARGETS=darwin linux windows
+TERRAFORM_PLUGIN_EXTENSION=
 VERSION=$$(grep TerraformProviderVersion proxmoxtf/version.go | grep -o -e '[0-9]\.[0-9]\.[0-9]')
 
+ifeq ($(OS),Windows_NT)
+	TERRAFORM_CACHE_DIRECTORY=$$(cygpath -u "$(APPDATA)")/terraform.d/plugins
+	TERRAFORM_PLATFORM=windows_amd64
+	TERRAFORM_PLUGIN_EXTENSION=.exe
+else
+	TERRAFORM_CACHE_DIRECTORY=$(HOME)/terraform.d/plugins
+	UNAME_S=$$(shell uname -s)
+
+	ifeq ($(UNAME_S),Darwin)
+		TERRAFORM_PLATFORM=darwin_amd64
+	else
+		TERRAFORM_PLATFORM=linux_amd64
+	endif
+endif
+
+TERRAFORM_PLUGIN_DIRECTORY=$(TERRAFORM_CACHE_DIRECTORY)/terraform.danitso.com/provider/proxmox/$(VERSION)/$(TERRAFORM_PLATFORM)
+TERRAFORM_PLUGIN_EXECUTABLE=$(TERRAFORM_PLUGIN_DIRECTORY)/$(NAME)_v$(VERSION)_x4$(TERRAFORM_PLUGIN_EXTENSION)
+
 default: build
 
 build:
@@ -19,6 +38,11 @@ example-destroy:
 example-init:
 	rm -f "example/$(NAME)_v"*
 	go build -o "example/$(NAME)_v$(VERSION)-custom_x4"
+
+	mkdir -p "$(TERRAFORM_PLUGIN_DIRECTORY)"
+	rm -f "$(TERRAFORM_PLUGIN_EXECUTABLE)"
+	cp "example/$(NAME)_v$(VERSION)-custom_x4" "$(TERRAFORM_PLUGIN_EXECUTABLE)"
+
 	cd ./example && terraform init
 
 example-plan:

example/versions.tf

@@ -0,0 +1,14 @@
+terraform {
+  required_providers {
+    local = {
+      source = "hashicorp/local"
+    }
+    proxmox = {
+      source  = "terraform.danitso.com/provider/proxmox"
+    }
+    tls = {
+      source = "hashicorp/tls"
+    }
+  }
+  required_version = ">= 0.13"
+}

proxmox/virtual_environment_vm.go

@@ -180,16 +180,14 @@ func (c *VirtualEnvironmentClient) WaitForNetworkInterfacesFromVMAgent(nodeName
 				missingIP := false
 
 				if waitForIP {
-					if len(*data.Result) == 0 {
-						missingIP = true
-					} else if len(*data.Result) == 1 && (*data.Result)[0].Name == "lo" {
-						missingIP = true
-					} else {
-						for _, nic := range *data.Result {
-							if nic.IPAddresses != nil && len(*nic.IPAddresses) == 0 {
-								missingIP = true
-								break
-							}
+					for _, nic := range *data.Result {
+						if nic.Name == "lo" {
+							continue
+						}
+
+						if nic.IPAddresses == nil || (nic.IPAddresses != nil && len(*nic.IPAddresses) == 0) {
+							missingIP = true
+							break
 						}
 					}
 				}