terraform/command/remote.go

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package command
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import (
"bytes"
"flag"
"fmt"
"io/ioutil"
"log"
"os"
"strings"
"github.com/hashicorp/terraform/remote"
"github.com/hashicorp/terraform/terraform"
)
// remoteCommandConfig is used to encapsulate our configuration
type remoteCommandConfig struct {
disableRemote bool
pullOnDisable bool
statePath string
backupPath string
}
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// RemoteCommand is a Command implementation that is used to
// enable and disable remote state management
type RemoteCommand struct {
Meta
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conf remoteCommandConfig
remoteConf terraform.RemoteState
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}
func (c *RemoteCommand) Run(args []string) int {
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args = c.Meta.process(args, false)
cmdFlags := flag.NewFlagSet("remote", flag.ContinueOnError)
cmdFlags.BoolVar(&c.conf.disableRemote, "disable", false, "")
cmdFlags.BoolVar(&c.conf.pullOnDisable, "pull", true, "")
cmdFlags.StringVar(&c.conf.statePath, "state", "", "path")
cmdFlags.StringVar(&c.conf.backupPath, "backup", "", "path")
cmdFlags.StringVar(&c.remoteConf.AuthToken, "auth", "", "")
cmdFlags.StringVar(&c.remoteConf.Name, "name", "", "")
cmdFlags.StringVar(&c.remoteConf.Server, "server", "", "")
cmdFlags.Usage = func() { c.Ui.Error(c.Help()) }
if err := cmdFlags.Parse(args); err != nil {
return 1
}
// Check if have an existing local state file
haveLocal, err := remote.HaveLocalState()
if err != nil {
c.Ui.Error(fmt.Sprintf("Failed to check for local state: %v", err))
return 1
}
// Check if we have the non-managed state file
haveNonManaged, err := remote.ExistsFile(c.conf.statePath)
if err != nil {
c.Ui.Error(fmt.Sprintf("Failed to check for state file: %v", err))
return 1
}
// Check if remote state is being disabled
if c.conf.disableRemote {
if !haveLocal {
c.Ui.Error(fmt.Sprintf("Remote state management not enabled! Aborting."))
return 1
}
if haveNonManaged {
c.Ui.Error(fmt.Sprintf("State file already exists at '%s'. Aborting.",
c.conf.statePath))
return 1
}
return c.disableRemoteState()
}
// Ensure there is no conflict
switch {
case haveLocal && haveNonManaged:
c.Ui.Error(fmt.Sprintf("Remote state is enabled, but non-managed state file '%s' is also present!",
c.conf.statePath))
return 1
case !haveLocal && !haveNonManaged:
// If we don't have either state file, initialize a blank state file
return c.initBlankState()
case haveLocal && !haveNonManaged:
// Update the remote state target potentially
return c.updateRemoteConfig()
case !haveLocal && haveNonManaged:
// Enable remote state management
return c.enableRemoteState()
default:
panic("unhandled case")
}
return 0
}
// pullState is used to refresh our state before disabling remote
// state management
func (c *RemoteCommand) pullState() error {
// TODO
return nil
}
// disableRemoteState is used to disable remote state management,
// and move the state file into place.
func (c *RemoteCommand) disableRemoteState() int {
// Ensure we have the latest state before disabling
if c.conf.pullOnDisable {
if err := c.pullState(); err != nil {
c.Ui.Error(fmt.Sprintf("%s", err))
return 1
}
}
// Get the local state
local, _, err := remote.ReadLocalState()
if err != nil {
c.Ui.Error(fmt.Sprintf("Failed to read local state: %v", err))
return 1
}
// Clear the remote management, and copy into place
local.Remote = nil
fh, err := os.Create(c.conf.statePath)
if err != nil {
c.Ui.Error(fmt.Sprintf("Failed to create state file '%s': %v",
c.conf.statePath, err))
return 1
}
defer fh.Close()
if err := terraform.WriteState(local, fh); err != nil {
c.Ui.Error(fmt.Sprintf("Failed to encode state file: %v",
c.conf.statePath, err))
return 1
}
// Remove the old state file
path, err := remote.HiddenStatePath()
if err != nil {
c.Ui.Error(fmt.Sprintf("Failed to get local state path: %v", err))
return 1
}
if err := os.Remove(path); err != nil {
c.Ui.Error(fmt.Sprintf("Failed to remove the local state file: %v", err))
return 1
}
return 0
}
// validateRemoteConfig is used to verify that the remote configuration
// we have is valid
func (c *RemoteCommand) validateRemoteConfig() error {
err := remote.ValidConfig(&c.remoteConf)
if err != nil {
c.Ui.Error(fmt.Sprintf("%s", err))
}
return err
}
// initBlank state is used to initialize a blank state that is
// remote enabled
func (c *RemoteCommand) initBlankState() int {
// Validate the remote configuration
if err := c.validateRemoteConfig(); err != nil {
return 1
}
// Make the hidden directory
if err := remote.EnsureDirectory(); err != nil {
c.Ui.Error(fmt.Sprintf("%s", err))
return 1
}
// Make a blank state, attach the remote configuration
blank := terraform.NewState()
blank.Remote = &c.remoteConf
// Persist the state
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if err := remote.PersistState(blank); err != nil {
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c.Ui.Error(fmt.Sprintf("Failed to initialize state file: %v", err))
return 1
}
// Success!
c.Ui.Output("Initialized blank state with remote state enabled!")
return 0
}
// updateRemoteConfig is used to update the configuration of the
// remote state store
func (c *RemoteCommand) updateRemoteConfig() int {
// Validate the remote configuration
if err := c.validateRemoteConfig(); err != nil {
return 1
}
// Read in the local state
local, _, err := remote.ReadLocalState()
if err != nil {
c.Ui.Error(fmt.Sprintf("Failed to read local state: %v", err))
return 1
}
// Update the configuration
local.Remote = &c.remoteConf
if err := remote.PersistState(local); err != nil {
c.Ui.Error(fmt.Sprintf("%s", err))
return 1
}
// Success!
c.Ui.Output("Remote configuration updated")
return 0
}
// enableRemoteState is used to enable remote state management
// and to move a state file into place
func (c *RemoteCommand) enableRemoteState() int {
// Validate the remote configuration
if err := c.validateRemoteConfig(); err != nil {
return 1
}
// Make the hidden directory
if err := remote.EnsureDirectory(); err != nil {
c.Ui.Error(fmt.Sprintf("%s", err))
return 1
}
// Read the provided state file
raw, err := ioutil.ReadFile(c.conf.statePath)
if err != nil {
c.Ui.Error(fmt.Sprintf("Failed to read '%s': %v", c.conf.statePath, err))
return 1
}
state, err := terraform.ReadState(bytes.NewReader(raw))
if err != nil {
c.Ui.Error(fmt.Sprintf("Failed to decode '%s': %v", c.conf.statePath, err))
return 1
}
// Backup the state file before we modify it
backupPath := c.conf.backupPath
if backupPath != "-" {
// Provide default backup path if none provided
if backupPath == "" {
backupPath = c.conf.statePath + DefaultBackupExtention
}
log.Printf("[INFO] Writing backup state to: %s", backupPath)
f, err := os.Create(backupPath)
if err == nil {
err = terraform.WriteState(state, f)
f.Close()
}
if err != nil {
c.Ui.Error(fmt.Sprintf("Error writing backup state file: %s", err))
return 1
}
}
// Update the local configuration, move into place
state.Remote = &c.remoteConf
if err := remote.PersistState(state); err != nil {
c.Ui.Error(fmt.Sprintf("%s", err))
return 1
}
// Remove the state file
log.Printf("[INFO] Removing state file: %s", c.conf.statePath)
if err := os.Remove(c.conf.statePath); err != nil {
c.Ui.Error(fmt.Sprintf("Failed to remove state file '%s': %v",
c.conf.statePath, err))
return 1
}
// Success!
c.Ui.Output("Remote state management enabled")
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return 0
}
func (c *RemoteCommand) Help() string {
helpText := `
Usage: terraform remote [options]
Configures Terraform to use a remote state server. This allows state
to be pulled down when necessary and then pushed to the server when
updated. In this mode, the state file does not need to be stored durably
since the remote server provides the durability.
Options:
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-auth=token Authentication token for state storage server.
Optional, defaults to blank.
-backup=path Path to backup the existing state file before
modifying. Defaults to the "-state" path with
".backup" extension. Set to "-" to disable backup.
-disable Disables remote state management and migrates the state
to the -state path.
-pull=true Controls if the remote state is pulled before disabling.
This defaults to true to ensure the latest state is cached
before disabling.
-name=name Name of the state file in the state storage server.
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Optional, default does not use remote storage.
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-server=url URL of the remote storage server.
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-state=path Path to read state. Defaults to "terraform.tfstate"
unless remote state is enabled.
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`
return strings.TrimSpace(helpText)
}
func (c *RemoteCommand) Synopsis() string {
return "Configures remote state management"
}