package command 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 } // RemoteCommand is a Command implementation that is used to // enable and disable remote state management type RemoteCommand struct { Meta conf remoteCommandConfig remoteConf terraform.RemoteState } func (c *RemoteCommand) Run(args []string) int { 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", DefaultStateFilename, "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 } // disableRemoteState is used to disable remote state management, // and move the state file into place. func (c *RemoteCommand) disableRemoteState() int { // 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 } // Ensure we have the latest state before disabling if c.conf.pullOnDisable { log.Printf("[INFO] Refreshing local state from remote server") change, err := remote.RefreshState(local.Remote) if err != nil { c.Ui.Error(fmt.Sprintf( "Failed to refresh from remote state: %v", err)) return 1 } // Exit if we were unable to update if !change.SuccessfulPull() { c.Ui.Error(fmt.Sprintf("%s", change)) return 1 } else { log.Printf("[INFO] %s", change) } // Reload the local state after the refresh 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 if err := remote.PersistState(blank); err != nil { 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") 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: -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. Optional, default does not use remote storage. -server=url URL of the remote storage server. -state=path Path to read state. Defaults to "terraform.tfstate" unless remote state is enabled. ` return strings.TrimSpace(helpText) } func (c *RemoteCommand) Synopsis() string { return "Configures remote state management" }