package command import ( "bytes" "fmt" "os" "sort" "strings" "github.com/hashicorp/go-getter" "github.com/hashicorp/go-multierror" "github.com/hashicorp/terraform/terraform" ) // ApplyCommand is a Command implementation that applies a Terraform // configuration and actually builds or changes infrastructure. type ApplyCommand struct { Meta // If true, then this apply command will become the "destroy" // command. It is just like apply but only processes a destroy. Destroy bool // When this channel is closed, the apply will be cancelled. ShutdownCh <-chan struct{} } func (c *ApplyCommand) Run(args []string) int { var destroyForce, refresh bool args = c.Meta.process(args, true) cmdName := "apply" if c.Destroy { cmdName = "destroy" } cmdFlags := c.Meta.flagSet(cmdName) if c.Destroy { cmdFlags.BoolVar(&destroyForce, "force", false, "force") } cmdFlags.BoolVar(&refresh, "refresh", true, "refresh") cmdFlags.IntVar( &c.Meta.parallelism, "parallelism", DefaultParallelism, "parallelism") cmdFlags.StringVar(&c.Meta.statePath, "state", DefaultStateFilename, "path") cmdFlags.StringVar(&c.Meta.stateOutPath, "state-out", "", "path") cmdFlags.StringVar(&c.Meta.backupPath, "backup", "", "path") cmdFlags.Usage = func() { c.Ui.Error(c.Help()) } if err := cmdFlags.Parse(args); err != nil { return 1 } pwd, err := os.Getwd() if err != nil { c.Ui.Error(fmt.Sprintf("Error getting pwd: %s", err)) return 1 } var configPath string maybeInit := true args = cmdFlags.Args() if len(args) > 1 { c.Ui.Error("The apply command expects at most one argument.") cmdFlags.Usage() return 1 } else if len(args) == 1 { configPath = args[0] } else { configPath = pwd maybeInit = false } // Prepare the extra hooks to count resources countHook := new(CountHook) stateHook := new(StateHook) c.Meta.extraHooks = []terraform.Hook{countHook, stateHook} if !c.Destroy && maybeInit { // Do a detect to determine if we need to do an init + apply. if detected, err := getter.Detect(configPath, pwd, getter.Detectors); err != nil { c.Ui.Error(fmt.Sprintf( "Invalid path: %s", err)) return 1 } else if !strings.HasPrefix(detected, "file") { // If this isn't a file URL then we're doing an init + // apply. var init InitCommand init.Meta = c.Meta if code := init.Run([]string{detected}); code != 0 { return code } // Change the config path to be the cwd configPath = pwd } } // Build the context based on the arguments given ctx, planned, err := c.Context(contextOpts{ Destroy: c.Destroy, Path: configPath, StatePath: c.Meta.statePath, Parallelism: c.Meta.parallelism, }) if err != nil { c.Ui.Error(err.Error()) return 1 } if c.Destroy && planned { c.Ui.Error(fmt.Sprintf( "Destroy can't be called with a plan file.")) return 1 } if !destroyForce && c.Destroy { // Default destroy message desc := "Terraform will delete all your managed infrastructure.\n" + "There is no undo. Only 'yes' will be accepted to confirm." // If targets are specified, list those to user if c.Meta.targets != nil { var descBuffer bytes.Buffer descBuffer.WriteString("Terraform will delete the following infrastructure:\n") for _, target := range c.Meta.targets { descBuffer.WriteString("\t") descBuffer.WriteString(target) descBuffer.WriteString("\n") } descBuffer.WriteString("There is no undo. Only 'yes' will be accepted to confirm") desc = descBuffer.String() } v, err := c.UIInput().Input(&terraform.InputOpts{ Id: "destroy", Query: "Do you really want to destroy?", Description: desc, }) if err != nil { c.Ui.Error(fmt.Sprintf("Error asking for confirmation: %s", err)) return 1 } if v != "yes" { c.Ui.Output("Destroy cancelled.") return 1 } } if !planned { if err := ctx.Input(c.InputMode()); err != nil { c.Ui.Error(fmt.Sprintf("Error configuring: %s", err)) return 1 } } if !validateContext(ctx, c.Ui) { return 1 } // Plan if we haven't already if !planned { if refresh { if _, err := ctx.Refresh(); err != nil { c.Ui.Error(fmt.Sprintf("Error refreshing state: %s", err)) return 1 } } if _, err := ctx.Plan(); err != nil { c.Ui.Error(fmt.Sprintf( "Error creating plan: %s", err)) return 1 } } // Setup the state hook for continuous state updates { state, err := c.State() if err != nil { c.Ui.Error(fmt.Sprintf( "Error reading state: %s", err)) return 1 } stateHook.State = state } // Start the apply in a goroutine so that we can be interrupted. var state *terraform.State var applyErr error doneCh := make(chan struct{}) go func() { defer close(doneCh) state, applyErr = ctx.Apply() }() // Wait for the apply to finish or for us to be interrupted so // we can handle it properly. err = nil select { case <-c.ShutdownCh: c.Ui.Output("Interrupt received. Gracefully shutting down...") // Stop execution go ctx.Stop() // Still get the result, since there is still one select { case <-c.ShutdownCh: c.Ui.Error( "Two interrupts received. Exiting immediately. Note that data\n" + "loss may have occurred.") return 1 case <-doneCh: } case <-doneCh: } // Persist the state if state != nil { if err := c.Meta.PersistState(state); err != nil { c.Ui.Error(fmt.Sprintf("Failed to save state: %s", err)) return 1 } } if applyErr != nil { c.Ui.Error(fmt.Sprintf( "Error applying plan:\n\n"+ "%s\n\n"+ "Terraform does not automatically rollback in the face of errors.\n"+ "Instead, your Terraform state file has been partially updated with\n"+ "any resources that successfully completed. Please address the error\n"+ "above and apply again to incrementally change your infrastructure.", multierror.Flatten(applyErr))) return 1 } c.Ui.Output(c.Colorize().Color(fmt.Sprintf( "[reset][bold][green]\n"+ "Apply complete! Resources: %d added, %d changed, %d destroyed.", countHook.Added, countHook.Changed, countHook.Removed))) if countHook.Added > 0 || countHook.Changed > 0 { c.Ui.Output(c.Colorize().Color(fmt.Sprintf( "[reset]\n"+ "The state of your infrastructure has been saved to the path\n"+ "below. This state is required to modify and destroy your\n"+ "infrastructure, so keep it safe. To inspect the complete state\n"+ "use the `terraform show` command.\n\n"+ "State path: %s", c.Meta.StateOutPath()))) } if !c.Destroy { if outputs := outputsAsString(state); outputs != "" { c.Ui.Output(c.Colorize().Color(outputs)) } } return 0 } func (c *ApplyCommand) Help() string { if c.Destroy { return c.helpDestroy() } return c.helpApply() } func (c *ApplyCommand) Synopsis() string { if c.Destroy { return "Destroy Terraform-managed infrastructure" } return "Builds or changes infrastructure" } func (c *ApplyCommand) helpApply() string { helpText := ` Usage: terraform apply [options] [DIR] Builds or changes infrastructure according to Terraform configuration files in DIR. DIR can also be a SOURCE as given to the "init" command. In this case, apply behaves as though "init" was called followed by "apply". This only works for sources that aren't files, and only if the current working directory is empty of Terraform files. This is a shortcut for getting started. Options: -backup=path Path to backup the existing state file before modifying. Defaults to the "-state-out" path with ".backup" extension. Set to "-" to disable backup. -input=true Ask for input for variables if not directly set. -no-color If specified, output won't contain any color. -parallelism=n Limit the number of concurrent operations. Defaults to 10. -refresh=true Update state prior to checking for differences. This has no effect if a plan file is given to apply. -state=path Path to read and save state (unless state-out is specified). Defaults to "terraform.tfstate". -state-out=path Path to write state to that is different than "-state". This can be used to preserve the old state. -target=resource Resource to target. Operation will be limited to this resource and its dependencies. This flag can be used multiple times. -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 *ApplyCommand) helpDestroy() string { helpText := ` Usage: terraform destroy [options] [DIR] Destroy Terraform-managed infrastructure. Options: -backup=path Path to backup the existing state file before modifying. Defaults to the "-state-out" path with ".backup" extension. Set to "-" to disable backup. -force Don't ask for input for destroy confirmation. -no-color If specified, output won't contain any color. -parallelism=n Limit the number of concurrent operations. Defaults to 10. -refresh=true Update state prior to checking for differences. This has no effect if a plan file is given to apply. -state=path Path to read and save state (unless state-out is specified). Defaults to "terraform.tfstate". -state-out=path Path to write state to that is different than "-state". This can be used to preserve the old state. -target=resource Resource to target. Operation will be limited to this resource and its dependencies. This flag can be used multiple times. -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 outputsAsString(state *terraform.State) string { if state == nil { return "" } outputs := state.RootModule().Outputs outputBuf := new(bytes.Buffer) if len(outputs) > 0 { outputBuf.WriteString("[reset][bold][green]\nOutputs:\n\n") // Output the outputs in alphabetical order keyLen := 0 keys := make([]string, 0, len(outputs)) for key, _ := range outputs { keys = append(keys, key) if len(key) > keyLen { keyLen = len(key) } } sort.Strings(keys) for _, k := range keys { v := outputs[k] outputBuf.WriteString(fmt.Sprintf( " %s%s = %s\n", k, strings.Repeat(" ", keyLen-len(k)), v)) } } return strings.TrimSpace(outputBuf.String()) }