terraform/command/meta_new.go

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package command
import (
"fmt"
"log"
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"os"
"path/filepath"
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"strconv"
"github.com/hashicorp/errwrap"
"github.com/hashicorp/terraform/config"
"github.com/hashicorp/terraform/config/module"
"github.com/hashicorp/terraform/terraform"
)
// NOTE: Temporary file until this branch is cleaned up.
// Input returns whether or not input asking is enabled.
func (m *Meta) Input() bool {
if test || !m.input {
return false
}
if envVar := os.Getenv(InputModeEnvVar); envVar != "" {
if v, err := strconv.ParseBool(envVar); err == nil && !v {
return false
}
}
return true
}
// Module loads the module tree for the given root path.
//
// It expects the modules to already be downloaded. This will never
// download any modules.
func (m *Meta) Module(path string) (*module.Tree, error) {
mod, err := module.NewTreeModule("", path)
if err != nil {
// Check for the error where we have no config files
if errwrap.ContainsType(err, new(config.ErrNoConfigsFound)) {
return nil, nil
}
return nil, err
}
err = mod.Load(m.moduleStorage(m.DataDir()), module.GetModeNone)
if err != nil {
return nil, fmt.Errorf("Error loading modules: %s", err)
}
return mod, nil
}
// Config loads the root config for the path specified. Path may be a directory
// or file. The absence of configuration is not an error and returns a nil Config.
func (m *Meta) Config(path string) (*config.Config, error) {
// If no explicit path was given then it is okay for there to be
// no backend configuration found.
emptyOk := path == ""
// If we had no path set, it is an error. We can't initialize unset
if path == "" {
path = "."
}
// Expand the path
if !filepath.IsAbs(path) {
var err error
path, err = filepath.Abs(path)
if err != nil {
return nil, fmt.Errorf(
"Error expanding path to backend config %q: %s", path, err)
}
}
log.Printf("[DEBUG] command: loading backend config file: %s", path)
// We first need to determine if we're loading a file or a directory.
fi, err := os.Stat(path)
if err != nil {
if os.IsNotExist(err) && emptyOk {
log.Printf(
"[INFO] command: backend config not found, returning nil: %s",
path)
return nil, nil
}
return nil, err
}
var f func(string) (*config.Config, error) = config.LoadFile
if fi.IsDir() {
f = config.LoadDir
}
// Load the configuration
c, err := f(path)
if err != nil {
// Check for the error where we have no config files and return nil
// as the configuration type.
if errwrap.ContainsType(err, new(config.ErrNoConfigsFound)) {
log.Printf(
"[INFO] command: backend config not found, returning nil: %s",
path)
return nil, nil
}
return nil, err
}
return c, nil
}
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// Plan returns the plan for the given path.
//
// This only has an effect if the path itself looks like a plan.
// If error is nil and the plan is nil, then the path didn't look like
// a plan.
//
// Error will be non-nil if path looks like a plan and loading the plan
// failed.
func (m *Meta) Plan(path string) (*terraform.Plan, error) {
// Open the path no matter if its a directory or file
f, err := os.Open(path)
defer f.Close()
if err != nil {
return nil, fmt.Errorf(
"Failed to load Terraform configuration or plan: %s", err)
}
// Stat it so we can check if its a directory
fi, err := f.Stat()
if err != nil {
return nil, fmt.Errorf(
"Failed to load Terraform configuration or plan: %s", err)
}
// If this path is a directory, then it can't be a plan. Not an error.
if fi.IsDir() {
return nil, nil
}
// Read the plan
p, err := terraform.ReadPlan(f)
if err != nil {
return nil, err
}
// We do a validation here that seems odd but if any plan is given,
// we must not have set any extra variables. The plan itself contains
// the variables and those aren't overwritten.
if len(m.variables) > 0 {
return nil, 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 p, nil
}