terraform/command/meta.go

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package command
import (
"bufio"
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"flag"
"fmt"
"io"
"os"
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"path/filepath"
"strconv"
"github.com/hashicorp/go-getter"
"github.com/hashicorp/terraform/config/module"
"github.com/hashicorp/terraform/state"
"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 {
Color bool
ContextOpts *terraform.ContextOpts
Ui cli.Ui
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// State read when calling `Context`. This is available after calling
// `Context`.
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state state.State
stateResult *StateResult
// This can be set by the command itself to provide extra hooks.
extraHooks []terraform.Hook
// This can be set by tests to change some directories
dataDir string
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// Variables for the context (private)
autoKey string
autoVariables map[string]string
input bool
variables map[string]string
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// Targets for this context (private)
targets []string
color bool
oldUi cli.Ui
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// 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.
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//
// 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.
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//
// backupPath is used to backup the state file before writing a modified
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// version. It defaults to stateOutPath + DefaultBackupExtension
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//
// parallelism is used to control the number of concurrent operations
// allowed when walking the graph
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statePath string
stateOutPath string
backupPath string
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parallelism int
}
// 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 == "" {
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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,
}
}
// Context returns a Terraform Context taking into account the context
// options used to initialize this meta configuration.
func (m *Meta) Context(copts contextOpts) (*terraform.Context, bool, error) {
opts := m.contextOpts()
// First try to just read the plan directly from the path given.
f, err := os.Open(copts.Path)
if err == nil {
plan, err := terraform.ReadPlan(f)
f.Close()
if err == nil {
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// Setup our state
state, statePath, err := StateFromPlan(m.statePath, m.stateOutPath, plan)
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if err != nil {
return nil, false, fmt.Errorf("Error loading plan: %s", err)
}
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// Set our state
m.state = state
// this is used for printing the saved location later
if m.stateOutPath == "" {
m.stateOutPath = statePath
}
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if len(m.variables) > 0 {
return nil, false, fmt.Errorf(
"You can't set variables with the '-var' or '-var-file' flag\n" +
"when you're applying a plan file. The variables used when\n" +
"the plan was created will be used. If you wish to use different\n" +
"variable values, create a new plan file.")
}
ctx, err := plan.Context(opts)
return ctx, true, err
}
}
// Load the statePath if not given
if copts.StatePath != "" {
m.statePath = copts.StatePath
}
// Tell the context if we're in a destroy plan / apply
opts.Destroy = copts.Destroy
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// Store the loaded state
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state, err := m.State()
if err != nil {
return nil, false, err
}
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// Load the root module
var mod *module.Tree
if copts.Path != "" {
mod, err = module.NewTreeModule("", copts.Path)
if err != nil {
return nil, false, fmt.Errorf("Error loading config: %s", err)
}
} else {
mod = module.NewEmptyTree()
}
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err = mod.Load(m.moduleStorage(m.DataDir()), copts.GetMode)
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if err != nil {
return nil, false, fmt.Errorf("Error downloading modules: %s", err)
}
opts.Module = mod
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opts.Parallelism = copts.Parallelism
opts.State = state.State()
ctx, err := terraform.NewContext(opts)
return ctx, false, err
}
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// DataDir returns the directory where local data will be stored.
func (m *Meta) DataDir() string {
dataDir := DefaultDataDir
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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
if len(m.variables) == 0 {
mode |= terraform.InputModeVar
mode |= terraform.InputModeVarUnset
}
return mode
}
// State returns the state for this meta.
func (m *Meta) State() (state.State, error) {
if m.state != nil {
return m.state, nil
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}
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result, err := State(m.StateOpts())
if err != nil {
return nil, err
}
m.state = result.State
m.stateOutPath = result.StatePath
m.stateResult = result
return m.state, nil
}
// StateRaw is used to setup the state manually.
func (m *Meta) StateRaw(opts *StateOpts) (*StateResult, error) {
result, err := State(opts)
if err != nil {
return nil, err
}
m.state = result.State
m.stateOutPath = result.StatePath
m.stateResult = result
return result, nil
}
// StateOpts returns the default state options
func (m *Meta) StateOpts() *StateOpts {
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localPath := m.statePath
if localPath == "" {
localPath = DefaultStateFilename
}
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remotePath := filepath.Join(m.DataDir(), DefaultStateFilename)
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return &StateOpts{
LocalPath: localPath,
LocalPathOut: m.stateOutPath,
RemotePath: remotePath,
RemoteRefresh: true,
BackupPath: m.backupPath,
}
}
// UIInput returns a UIInput object to be used for asking for input.
func (m *Meta) UIInput() terraform.UIInput {
return &UIInput{
Colorize: m.Colorize(),
}
}
// PersistState is used to write out the state, handling backup of
// the existing state file and respecting path configurations.
func (m *Meta) PersistState(s *terraform.State) error {
if err := m.state.WriteState(s); err != nil {
return err
}
return m.state.PersistState()
}
// Input returns true if we should ask for input for context.
func (m *Meta) Input() bool {
return !test && m.input && len(m.variables) == 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 = *m.ContextOpts
opts.Hooks = make(
[]terraform.Hook,
len(m.ContextOpts.Hooks)+len(m.extraHooks)+1)
opts.Hooks[0] = m.uiHook()
copy(opts.Hooks[1:], m.ContextOpts.Hooks)
copy(opts.Hooks[len(m.ContextOpts.Hooks)+1:], m.extraHooks)
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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
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}
opts.Variables = vs
opts.Targets = m.targets
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opts.UIInput = m.UIInput()
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return &opts
}
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// 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")
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f.Var((*FlagKV)(&m.variables), "var", "variables")
f.Var((*FlagKVFile)(&m.variables), "var-file", "variable file")
f.Var((*FlagStringSlice)(&m.targets), "target", "resource to target")
if m.autoKey != "" {
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f.Var((*FlagKVFile)(&m.autoVariables), m.autoKey, "variable file")
}
// 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() {}
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return f
}
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// moduleStorage returns the module.Storage implementation used to store
// modules for commands.
func (m *Meta) moduleStorage(root string) getter.Storage {
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return &uiModuleStorage{
Storage: &getter.FolderStorage{
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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
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m.Color = false
args = append(args[:i], args[i+1:]...)
break
}
}
// Set the UI
m.oldUi = m.Ui
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m.Ui = &cli.ConcurrentUi{
Ui: &ColorizeUi{
Colorize: m.Colorize(),
ErrorColor: "[red]",
WarnColor: "[yellow]",
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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,
}
}
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
}
}
}
// contextOpts are the options used to load a context from a command.
type contextOpts struct {
// Path to the directory where the root module is.
Path string
// 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.
StatePath string
// GetMode is the module.GetMode to use when loading the module tree.
GetMode module.GetMode
// Set to true when running a destroy plan/apply.
Destroy bool
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// Number of concurrent operations allowed
Parallelism int
}