terraform/command/meta.go

409 lines
11 KiB
Go

package command
import (
"bufio"
"flag"
"fmt"
"io"
"io/ioutil"
"log"
"os"
"path/filepath"
"strconv"
"strings"
"time"
"github.com/hashicorp/go-getter"
"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
//
// lockState is set to false to disable state locking
statePath string
stateOutPath string
backupPath string
parallelism int
shadow bool
provider string
lockState 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
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() {}
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) {
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
}