package command import ( "flag" "fmt" "log" "os" "strings" "github.com/hashicorp/terraform/state" "github.com/hashicorp/terraform/state/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) config := make(map[string]string) 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.Type, "backend", "atlas", "") cmdFlags.Var((*FlagKV)(&config), "backend-config", "config") cmdFlags.Usage = func() { c.Ui.Error(c.Help()) } if err := cmdFlags.Parse(args); err != nil { return 1 } // Show help if given no inputs if !c.conf.disableRemote && c.remoteConf.Type == "atlas" && len(config) == 0 { cmdFlags.Usage() return 1 } // Set the local state path c.statePath = c.conf.statePath // Populate the various configurations c.remoteConf.Config = config // Get the state information. We specifically request the cache only // for the remote state here because it is possible the remote state // is invalid and we don't want to error. stateOpts := c.StateOpts() stateOpts.RemoteCacheOnly = true if _, err := c.StateRaw(stateOpts); err != nil { c.Ui.Error(fmt.Sprintf("Error loading local state: %s", err)) return 1 } // Get the local and remote [cached] state localState := c.stateResult.Local.State() var remoteState *terraform.State if remote := c.stateResult.Remote; remote != nil { remoteState = remote.State() } // Check if remote state is being disabled if c.conf.disableRemote { if !remoteState.IsRemote() { c.Ui.Error(fmt.Sprintf("Remote state management not enabled! Aborting.")) return 1 } if !localState.Empty() { 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 haveCache := !remoteState.Empty() haveLocal := !localState.Empty() switch { case haveCache && haveLocal: c.Ui.Error(fmt.Sprintf("Remote state is enabled, but non-managed state file '%s' is also present!", c.conf.statePath)) return 1 case !haveCache && !haveLocal: // If we don't have either state file, initialize a blank state file return c.initBlankState() case haveCache && !haveLocal: // Update the remote state target potentially return c.updateRemoteConfig() case !haveCache && haveLocal: // Enable remote state management return c.enableRemoteState() } panic("unhandled case") } // disableRemoteState is used to disable remote state management, // and move the state file into place. func (c *RemoteCommand) disableRemoteState() int { if c.stateResult == nil { c.Ui.Error(fmt.Sprintf( "Internal error. State() must be called internally before remote\n" + "state can be disabled. Please report this as a bug.")) return 1 } if !c.stateResult.State.State().IsRemote() { c.Ui.Error(fmt.Sprintf( "Remote state is not enabled. Can't disable remote state.")) return 1 } local := c.stateResult.Local remote := c.stateResult.Remote // Ensure we have the latest state before disabling if c.conf.pullOnDisable { log.Printf("[INFO] Refreshing local state from remote server") if err := remote.RefreshState(); err != nil { c.Ui.Error(fmt.Sprintf( "Failed to refresh from remote state: %s", err)) return 1 } // Exit if we were unable to update if change := remote.RefreshResult(); !change.SuccessfulPull() { c.Ui.Error(fmt.Sprintf("%s", change)) return 1 } else { log.Printf("[INFO] %s", change) } } // Clear the remote management, and copy into place newState := remote.State() newState.Remote = nil if err := local.WriteState(newState); err != nil { c.Ui.Error(fmt.Sprintf("Failed to encode state file '%s': %s", c.conf.statePath, err)) return 1 } if err := local.PersistState(); err != nil { c.Ui.Error(fmt.Sprintf("Failed to encode state file '%s': %s", c.conf.statePath, err)) return 1 } // Remove the old state file if err := os.Remove(c.stateResult.RemotePath); 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 { conf := c.remoteConf _, err := remote.NewClient(conf.Type, conf.Config) 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 a blank state, attach the remote configuration blank := terraform.NewState() blank.Remote = &c.remoteConf // Persist the state remote := &state.LocalState{Path: c.stateResult.RemotePath} if err := remote.WriteState(blank); err != nil { c.Ui.Error(fmt.Sprintf("Failed to initialize state file: %v", err)) return 1 } if err := remote.PersistState(); 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, which is just the cache of the remote state remote := c.stateResult.Remote.Cache // Update the configuration state := remote.State() state.Remote = &c.remoteConf if err := remote.WriteState(state); err != nil { c.Ui.Error(fmt.Sprintf("%s", err)) return 1 } if err := remote.PersistState(); 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 } // Read the local state local := c.stateResult.Local if err := local.RefreshState(); err != nil { c.Ui.Error(fmt.Sprintf("Failed to read local state: %s", 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) backup := &state.LocalState{Path: backupPath} if err := backup.WriteState(local.State()); err != nil { c.Ui.Error(fmt.Sprintf("Error writing backup state file: %s", err)) return 1 } if err := backup.PersistState(); err != nil { c.Ui.Error(fmt.Sprintf("Error writing backup state file: %s", err)) return 1 } } // Update the local configuration, move into place state := local.State() state.Remote = &c.remoteConf remote := c.stateResult.Remote if err := remote.WriteState(state); err != nil { c.Ui.Error(fmt.Sprintf("%s", err)) return 1 } if err := remote.PersistState(); err != nil { c.Ui.Error(fmt.Sprintf("%s", err)) return 1 } // Remove the original, local 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: -backend=Atlas Specifies the type of remote backend. Must be one of Atlas, Consul, or HTTP. Defaults to Atlas. -backend-config="k=v" Specifies configuration for the remote storage backend. This can be specified multiple times. -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. -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" }