terraform/command/meta.go

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package command
import (
"fmt"
"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
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.
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func (m *Meta) Context(path, statePath string, doPlan bool) (*terraform.Context, 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 {
return plan.Context(opts), nil
}
}
if statePath != "" {
if _, err := os.Stat(statePath); err != nil {
return nil, fmt.Errorf(
"There was an error reading the state file. The path\n"+
"and error are shown below. If you're trying to build a\n"+
"brand new infrastructure, explicitly pass the '-init'\n"+
"flag to Terraform to tell it it is okay to build new\n"+
"state.\n\n"+
"Path: %s\n"+
"Error: %s",
statePath,
err)
}
}
// Load up the state
var state *terraform.State
if statePath != "" {
f, err := os.Open(statePath)
if err == nil {
state, err = terraform.ReadState(f)
f.Close()
}
if err != nil {
return nil, fmt.Errorf("Error loading state: %s", err)
}
}
config, err := config.LoadDir(path)
if err != nil {
return nil, fmt.Errorf("Error loading config: %s", err)
}
if err := config.Validate(); err != nil {
return nil, fmt.Errorf("Error validating config: %s", err)
}
opts.Config = config
opts.State = state
ctx := terraform.NewContext(opts)
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if doPlan {
if _, err := ctx.Plan(nil); err != nil {
return nil, fmt.Errorf("Error running plan: %s", err)
}
}
return ctx, 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)+1)
opts.Hooks[0] = m.uiHook()
copy(opts.Hooks[1:], m.ContextOpts.Hooks)
return &opts
}
// 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) []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
m.Ui = &ColorizeUi{
Colorize: m.Colorize(),
ErrorColor: "[red]",
Ui: m.oldUi,
}
return args
}
// uiHook returns the UiHook to use with the context.
func (m *Meta) uiHook() *UiHook {
return &UiHook{
Colorize: m.Colorize(),
Ui: m.Ui,
}
}