package command import ( "bufio" "fmt" "strings" "github.com/hashicorp/terraform/backend" "github.com/hashicorp/terraform/config" "github.com/hashicorp/terraform/helper/wrappedstreams" "github.com/hashicorp/terraform/repl" "github.com/mitchellh/cli" ) // ConsoleCommand is a Command implementation that applies a Terraform // configuration and actually builds or changes infrastructure. type ConsoleCommand struct { Meta // When this channel is closed, the apply will be cancelled. ShutdownCh <-chan struct{} } func (c *ConsoleCommand) Run(args []string) int { args = c.Meta.process(args, true) cmdFlags := c.Meta.flagSet("console") cmdFlags.StringVar(&c.Meta.statePath, "state", DefaultStateFilename, "path") cmdFlags.Usage = func() { c.Ui.Error(c.Help()) } if err := cmdFlags.Parse(args); err != nil { return 1 } configPath, err := ModulePath(cmdFlags.Args()) if err != nil { c.Ui.Error(err.Error()) return 1 } // Load the module mod, err := c.Module(configPath) if err != nil { c.Ui.Error(fmt.Sprintf("Failed to load root config module: %s", err)) return 1 } var conf *config.Config if mod != nil { conf = mod.Config() } // Load the backend b, err := c.Backend(&BackendOpts{ Config: conf, }) if err != nil { c.Ui.Error(fmt.Sprintf("Failed to load backend: %s", err)) return 1 } // We require a local backend local, ok := b.(backend.Local) if !ok { c.Ui.Error(ErrUnsupportedLocalOp) return 1 } // Build the operation opReq := c.Operation() opReq.Module = mod // Get the context ctx, _, err := local.Context(opReq) if err != nil { c.Ui.Error(err.Error()) return 1 } // Setup the UI so we can output directly to stdout ui := &cli.BasicUi{ Writer: wrappedstreams.Stdout(), ErrorWriter: wrappedstreams.Stderr(), } // IO Loop session := &repl.Session{ Interpolater: ctx.Interpolater(), } // Determine if stdin is a pipe. If so, we evaluate directly. if c.StdinPiped() { return c.modePiped(session, ui) } return c.modeInteractive(session, ui) } func (c *ConsoleCommand) modePiped(session *repl.Session, ui cli.Ui) int { var lastResult string scanner := bufio.NewScanner(wrappedstreams.Stdin()) for scanner.Scan() { // Handle it. If there is an error exit immediately result, err := session.Handle(strings.TrimSpace(scanner.Text())) if err != nil { ui.Error(err.Error()) return 1 } // Store the last result lastResult = result } // Output the final result ui.Output(lastResult) return 0 } func (c *ConsoleCommand) Help() string { helpText := ` Usage: terraform console [options] [DIR] Starts an interactive console for experimenting with Terraform interpolations. This will open an interactive console that you can use to type interpolations into and inspect their values. This command loads the current state. This lets you explore and test interpolations before using them in future configurations. This command will never modify your state. DIR can be set to a directory with a Terraform state to load. By default, this will default to the current working directory. Options: -state=path Path to read state. Defaults to "terraform.tfstate" -var 'foo=bar' Set a variable in the Terraform configuration. This flag can be set multiple times. -var-file=foo Set variables in the Terraform configuration from a file. If "terraform.tfvars" is present, it will be automatically loaded if this flag is not specified. ` return strings.TrimSpace(helpText) } func (c *ConsoleCommand) Synopsis() string { return "Interactive console for Terraform interpolations" }