terraform/command/meta.go

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package command
import (
"bufio"
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"flag"
"fmt"
"io"
"os"
"github.com/hashicorp/terraform/config"
"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`.
state *terraform.State
// This can be set by the command itself to provide extra hooks.
extraHooks []terraform.Hook
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// Variables for the context (private)
autoKey string
autoVariables map[string]string
variables map[string]string
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color bool
oldUi cli.Ui
}
// 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(path, statePath string) (*terraform.Context, bool, error) {
opts := m.contextOpts()
// First try to just read the plan directly from the path given.
f, err := os.Open(path)
if err == nil {
plan, err := terraform.ReadPlan(f)
f.Close()
if err == nil {
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.")
}
return plan.Context(opts), true, nil
}
}
// Load up the state
var state *terraform.State
if statePath != "" {
f, err := os.Open(statePath)
if err != nil && os.IsNotExist(err) {
// If the state file doesn't exist, it is okay, since it
// is probably a new infrastructure.
err = nil
} else if err == nil {
state, err = terraform.ReadState(f)
f.Close()
}
if err != nil {
return nil, false, fmt.Errorf("Error loading state: %s", err)
}
}
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// Store the loaded state
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m.state = state
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config, err := config.LoadDir(path)
if err != nil {
return nil, false, fmt.Errorf("Error loading config: %s", err)
}
if err := config.Validate(); err != nil {
return nil, false, fmt.Errorf("Error validating config: %s", err)
}
opts.Config = config
opts.State = state
ctx := terraform.NewContext(opts)
return ctx, false, nil
}
// 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]string)
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
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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.Var((*FlagVar)(&m.variables), "var", "variables")
f.Var((*FlagVarFile)(&m.variables), "var-file", "variable file")
if m.autoKey != "" {
f.Var((*FlagVarFile)(&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)
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return f
}
// process will process the meta-parameters out of the arguments. This
// will potentially modify the args in-place. It will return the resulting
// slice.
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
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]",
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
}
}
return args
}
// uiHook returns the UiHook to use with the context.
func (m *Meta) uiHook() *UiHook {
return &UiHook{
Colorize: m.Colorize(),
Ui: m.Ui,
}
}