package command import ( "bufio" "bytes" "errors" "flag" "fmt" "io" "io/ioutil" "log" "os" "path/filepath" "strconv" "strings" "time" "github.com/hashicorp/go-getter" "github.com/hashicorp/terraform/backend" "github.com/hashicorp/terraform/backend/local" "github.com/hashicorp/terraform/helper/experiment" "github.com/hashicorp/terraform/helper/variables" "github.com/hashicorp/terraform/helper/wrappedstreams" "github.com/hashicorp/terraform/terraform" "github.com/mitchellh/cli" "github.com/mitchellh/colorstring" ) // Meta are the meta-options that are available on all or most commands. type Meta struct { // The exported fields below should be set by anyone using a // command with a Meta field. These are expected to be set externally // (not from within the command itself). Color bool // True if output should be colored ContextOpts *terraform.ContextOpts // Opts copied to initialize Ui cli.Ui // Ui for output // ExtraHooks are extra hooks to add to the context. ExtraHooks []terraform.Hook //---------------------------------------------------------- // Protected: commands can set these //---------------------------------------------------------- // Modify the data directory location. Defaults to DefaultDataDir dataDir string //---------------------------------------------------------- // Private: do not set these //---------------------------------------------------------- // backendState is the currently active backend state backendState *terraform.BackendState // Variables for the context (private) autoKey string autoVariables map[string]interface{} input bool variables map[string]interface{} // Targets for this context (private) targets []string // Internal fields color bool oldUi cli.Ui // The fields below are expected to be set by the command via // command line flags. See the Apply command for an example. // // statePath is the path to the state file. If this is empty, then // no state will be loaded. It is also okay for this to be a path to // a file that doesn't exist; it is assumed that this means that there // is simply no state. // // stateOutPath is used to override the output path for the state. // If not provided, the StatePath is used causing the old state to // be overriden. // // backupPath is used to backup the state file before writing a modified // version. It defaults to stateOutPath + DefaultBackupExtension // // parallelism is used to control the number of concurrent operations // allowed when walking the graph // // shadow is used to enable/disable the shadow graph // // provider is to specify specific resource providers // // stateLock is set to false to disable state locking // // stateLockTimeout is the optional duration to retry a state locks locks // when it is already locked by another process. // // forceInitCopy suppresses confirmation for copying state data during // init. statePath string stateOutPath string backupPath string parallelism int shadow bool provider string stateLock bool stateLockTimeout time.Duration forceInitCopy bool } // initStatePaths is used to initialize the default values for // statePath, stateOutPath, and backupPath func (m *Meta) initStatePaths() { if m.statePath == "" { m.statePath = DefaultStateFilename } if m.stateOutPath == "" { m.stateOutPath = m.statePath } if m.backupPath == "" { m.backupPath = m.stateOutPath + DefaultBackupExtension } } // StateOutPath returns the true output path for the state file func (m *Meta) StateOutPath() string { return m.stateOutPath } // Colorize returns the colorization structure for a command. func (m *Meta) Colorize() *colorstring.Colorize { return &colorstring.Colorize{ Colors: colorstring.DefaultColors, Disable: !m.color, Reset: true, } } // DataDir returns the directory where local data will be stored. func (m *Meta) DataDir() string { dataDir := DefaultDataDir if m.dataDir != "" { dataDir = m.dataDir } return dataDir } const ( // InputModeEnvVar is the environment variable that, if set to "false" or // "0", causes terraform commands to behave as if the `-input=false` flag was // specified. InputModeEnvVar = "TF_INPUT" ) // InputMode returns the type of input we should ask for in the form of // terraform.InputMode which is passed directly to Context.Input. func (m *Meta) InputMode() terraform.InputMode { if test || !m.input { return 0 } if envVar := os.Getenv(InputModeEnvVar); envVar != "" { if v, err := strconv.ParseBool(envVar); err == nil { if !v { return 0 } } } var mode terraform.InputMode mode |= terraform.InputModeProvider mode |= terraform.InputModeVar mode |= terraform.InputModeVarUnset return mode } // UIInput returns a UIInput object to be used for asking for input. func (m *Meta) UIInput() terraform.UIInput { return &UIInput{ Colorize: m.Colorize(), } } // StdinPiped returns true if the input is piped. func (m *Meta) StdinPiped() bool { fi, err := wrappedstreams.Stdin().Stat() if err != nil { // If there is an error, let's just say its not piped return false } return fi.Mode()&os.ModeNamedPipe != 0 } // contextOpts returns the options to use to initialize a Terraform // context with the settings from this Meta. func (m *Meta) contextOpts() *terraform.ContextOpts { var opts terraform.ContextOpts if v := m.ContextOpts; v != nil { opts = *v } opts.Hooks = []terraform.Hook{m.uiHook(), &terraform.DebugHook{}} if m.ContextOpts != nil { opts.Hooks = append(opts.Hooks, m.ContextOpts.Hooks...) } opts.Hooks = append(opts.Hooks, m.ExtraHooks...) vs := make(map[string]interface{}) for k, v := range opts.Variables { vs[k] = v } for k, v := range m.autoVariables { vs[k] = v } for k, v := range m.variables { vs[k] = v } opts.Variables = vs opts.Targets = m.targets opts.UIInput = m.UIInput() opts.Parallelism = m.parallelism opts.Shadow = m.shadow opts.Meta = &terraform.ContextMeta{ Env: m.Env(), } return &opts } // flags adds the meta flags to the given FlagSet. func (m *Meta) flagSet(n string) *flag.FlagSet { f := flag.NewFlagSet(n, flag.ContinueOnError) f.BoolVar(&m.input, "input", true, "input") f.Var((*variables.Flag)(&m.variables), "var", "variables") f.Var((*variables.FlagFile)(&m.variables), "var-file", "variable file") f.Var((*FlagStringSlice)(&m.targets), "target", "resource to target") if m.autoKey != "" { f.Var((*variables.FlagFile)(&m.autoVariables), m.autoKey, "variable file") } // Advanced (don't need documentation, or unlikely to be set) f.BoolVar(&m.shadow, "shadow", true, "shadow graph") // Experimental features experiment.Flag(f) // Create an io.Writer that writes to our Ui properly for errors. // This is kind of a hack, but it does the job. Basically: create // a pipe, use a scanner to break it into lines, and output each line // to the UI. Do this forever. errR, errW := io.Pipe() errScanner := bufio.NewScanner(errR) go func() { for errScanner.Scan() { m.Ui.Error(errScanner.Text()) } }() f.SetOutput(errW) // Set the default Usage to empty f.Usage = func() {} // command that bypass locking will supply their own flag on this var, but // set the initial meta value to true as a failsafe. m.stateLock = true return f } // moduleStorage returns the module.Storage implementation used to store // modules for commands. func (m *Meta) moduleStorage(root string) getter.Storage { return &uiModuleStorage{ Storage: &getter.FolderStorage{ StorageDir: filepath.Join(root, "modules"), }, Ui: m.Ui, } } // process will process the meta-parameters out of the arguments. This // will potentially modify the args in-place. It will return the resulting // slice. // // vars says whether or not we support variables. func (m *Meta) process(args []string, vars bool) []string { // We do this so that we retain the ability to technically call // process multiple times, even if we have no plans to do so if m.oldUi != nil { m.Ui = m.oldUi } // Set colorization m.color = m.Color for i, v := range args { if v == "-no-color" { m.color = false m.Color = false args = append(args[:i], args[i+1:]...) break } } // Set the UI m.oldUi = m.Ui m.Ui = &cli.ConcurrentUi{ Ui: &ColorizeUi{ Colorize: m.Colorize(), ErrorColor: "[red]", WarnColor: "[yellow]", Ui: m.oldUi, }, } // If we support vars and the default var file exists, add it to // the args... m.autoKey = "" if vars { if _, err := os.Stat(DefaultVarsFilename); err == nil { m.autoKey = "var-file-default" args = append(args, "", "") copy(args[2:], args[0:]) args[0] = "-" + m.autoKey args[1] = DefaultVarsFilename } if _, err := os.Stat(DefaultVarsFilename + ".json"); err == nil { m.autoKey = "var-file-default" args = append(args, "", "") copy(args[2:], args[0:]) args[0] = "-" + m.autoKey args[1] = DefaultVarsFilename + ".json" } } return args } // uiHook returns the UiHook to use with the context. func (m *Meta) uiHook() *UiHook { return &UiHook{ Colorize: m.Colorize(), Ui: m.Ui, } } // confirm asks a yes/no confirmation. func (m *Meta) confirm(opts *terraform.InputOpts) (bool, error) { if !m.input { return false, errors.New("input disabled") } for { v, err := m.UIInput().Input(opts) if err != nil { return false, fmt.Errorf( "Error asking for confirmation: %s", err) } switch strings.ToLower(v) { case "no": return false, nil case "yes": return true, nil } } } const ( // ModuleDepthDefault is the default value for // module depth, which can be overridden by flag // or env var ModuleDepthDefault = -1 // ModuleDepthEnvVar is the name of the environment variable that can be used to set module depth. ModuleDepthEnvVar = "TF_MODULE_DEPTH" ) func (m *Meta) addModuleDepthFlag(flags *flag.FlagSet, moduleDepth *int) { flags.IntVar(moduleDepth, "module-depth", ModuleDepthDefault, "module-depth") if envVar := os.Getenv(ModuleDepthEnvVar); envVar != "" { if md, err := strconv.Atoi(envVar); err == nil { *moduleDepth = md } } } // outputShadowError outputs the error from ctx.ShadowError. If the // error is nil then nothing happens. If output is false then it isn't // outputted to the user (you can define logic to guard against outputting). func (m *Meta) outputShadowError(err error, output bool) bool { // Do nothing if no error if err == nil { return false } // If not outputting, do nothing if !output { return false } // Write the shadow error output to a file path := fmt.Sprintf("terraform-error-%d.log", time.Now().UTC().Unix()) if err := ioutil.WriteFile(path, []byte(err.Error()), 0644); err != nil { // If there is an error writing it, just let it go log.Printf("[ERROR] Error writing shadow error: %s", err) return false } // Output! m.Ui.Output(m.Colorize().Color(fmt.Sprintf( "[reset][bold][yellow]\nExperimental feature failure! Please report a bug.\n\n"+ "This is not an error. Your Terraform operation completed successfully.\n"+ "Your real infrastructure is unaffected by this message.\n\n"+ "[reset][yellow]While running, Terraform sometimes tests experimental features in the\n"+ "background. These features cannot affect real state and never touch\n"+ "real infrastructure. If the features work properly, you see nothing.\n"+ "If the features fail, this message appears.\n\n"+ "You can report an issue at: https://github.com/hashicorp/terraform/issues\n\n"+ "The failure was written to %q. Please\n"+ "double check this file contains no sensitive information and report\n"+ "it with your issue.\n\n"+ "This is not an error. Your terraform operation completed successfully\n"+ "and your real infrastructure is unaffected by this message.", path, ))) return true } // Env returns the name of the currently configured environment, corresponding // to the desired named state. func (m *Meta) Env() string { dataDir := m.dataDir if m.dataDir == "" { dataDir = DefaultDataDir } envData, err := ioutil.ReadFile(filepath.Join(dataDir, local.DefaultEnvFile)) current := string(bytes.TrimSpace(envData)) if current == "" { current = backend.DefaultStateName } if err != nil && !os.IsNotExist(err) { // always return the default if we can't get an environment name log.Printf("[ERROR] failed to read current environment: %s", err) } return current } // SetEnv saves the named environment to the local filesystem. func (m *Meta) SetEnv(name string) error { dataDir := m.dataDir if m.dataDir == "" { dataDir = DefaultDataDir } err := os.MkdirAll(dataDir, 0755) if err != nil { return err } err = ioutil.WriteFile(filepath.Join(dataDir, local.DefaultEnvFile), []byte(name), 0644) if err != nil { return err } return nil }