package command import ( "flag" "fmt" "strings" "github.com/hashicorp/terraform/config" "github.com/hashicorp/terraform/terraform" "github.com/mitchellh/cli" ) // DiffCommand is a Command implementation that compares a Terraform // configuration to an actual infrastructure and shows the differences. type DiffCommand struct { TFConfig *terraform.Config Ui cli.Ui } func (c *DiffCommand) Run(args []string) int { cmdFlags := flag.NewFlagSet("diff", flag.ContinueOnError) cmdFlags.Usage = func() { c.Ui.Error(c.Help()) } if err := cmdFlags.Parse(args); err != nil { return 1 } args = cmdFlags.Args() if len(args) != 1 { c.Ui.Error( "The diff command expects only one argument with the path\n" + "to a Terraform configuration.\n") cmdFlags.Usage() return 1 } b, err := config.Load(args[0]) if err != nil { c.Ui.Error(fmt.Sprintf("Error loading blueprint: %s", err)) return 1 } tfconfig := c.TFConfig tfconfig.Config = b tf, err := terraform.New(tfconfig) if err != nil { c.Ui.Error(fmt.Sprintf("Error initializing Terraform: %s", err)) return 1 } diff, err := tf.Diff(nil) if err != nil { c.Ui.Error(fmt.Sprintf("Error running diff: %s", err)) return 1 } c.Ui.Output(strings.TrimSpace(diff.String())) return 0 } func (c *DiffCommand) Help() string { helpText := ` Usage: terraform diff [options] [terraform.tf] Shows the differences between the Terraform configuration and the actual state of an infrastructure. Options: -state=statefile Path to a Terraform state file to use to look up Terraform-managed resources. ` return strings.TrimSpace(helpText) } func (c *DiffCommand) Synopsis() string { return "Show changes between Terraform config and infrastructure" }