package command import ( "fmt" "strings" "github.com/hashicorp/terraform/backend" "github.com/hashicorp/terraform/command/arguments" "github.com/hashicorp/terraform/command/views" "github.com/hashicorp/terraform/tfdiags" ) // PlanCommand is a Command implementation that compares a Terraform // configuration to an actual infrastructure and shows the differences. type PlanCommand struct { Meta } func (c *PlanCommand) Run(rawArgs []string) int { // Parse and apply global view arguments common, rawArgs := arguments.ParseView(rawArgs) c.View.Configure(common) // Propagate -no-color for the remote backend's legacy use of Ui. This // should be removed when the remote backend is migrated to views. c.Meta.color = !common.NoColor c.Meta.Color = c.Meta.color // Parse and validate flags args, diags := arguments.ParsePlan(rawArgs) // Instantiate the view, even if there are flag errors, so that we render // diagnostics according to the desired view view := views.NewPlan(args.ViewType, c.RunningInAutomation, c.View) if diags.HasErrors() { view.Diagnostics(diags) view.HelpPrompt() return 1 } // Check for user-supplied plugin path var err error if c.pluginPath, err = c.loadPluginPath(); err != nil { diags = diags.Append(err) view.Diagnostics(diags) return 1 } // FIXME: the -input flag value is needed to initialize the backend and the // operation, but there is no clear path to pass this value down, so we // continue to mutate the Meta object state for now. c.Meta.input = args.InputEnabled // FIXME: the -parallelism flag is used to control the concurrency of // Terraform operations. At the moment, this value is used both to // initialize the backend via the ContextOpts field inside CLIOpts, and to // set a largely unused field on the Operation request. Again, there is no // clear path to pass this value down, so we continue to mutate the Meta // object state for now. c.Meta.parallelism = args.Operation.Parallelism diags = diags.Append(c.providerDevOverrideRuntimeWarnings()) // Prepare the backend with the backend-specific arguments be, beDiags := c.PrepareBackend(args.State) diags = diags.Append(beDiags) if diags.HasErrors() { view.Diagnostics(diags) return 1 } // Build the operation request opReq, opDiags := c.OperationRequest(be, view, args.Operation, args.OutPath) diags = diags.Append(opDiags) if diags.HasErrors() { view.Diagnostics(diags) return 1 } // Collect variable value and add them to the operation request diags = diags.Append(c.GatherVariables(opReq, args.Vars)) if diags.HasErrors() { view.Diagnostics(diags) return 1 } // Before we delegate to the backend, we'll print any warning diagnostics // we've accumulated here, since the backend will start fresh with its own // diagnostics. view.Diagnostics(diags) diags = nil // Perform the operation op, err := c.RunOperation(be, opReq) if err != nil { diags = diags.Append(err) view.Diagnostics(diags) return 1 } if op.Result != backend.OperationSuccess { return op.Result.ExitStatus() } if args.DetailedExitCode && !op.PlanEmpty { return 2 } return op.Result.ExitStatus() } func (c *PlanCommand) PrepareBackend(args *arguments.State) (backend.Enhanced, tfdiags.Diagnostics) { // FIXME: we need to apply the state arguments to the meta object here // because they are later used when initializing the backend. Carving a // path to pass these arguments to the functions that need them is // difficult but would make their use easier to understand. c.Meta.applyStateArguments(args) backendConfig, diags := c.loadBackendConfig(".") if diags.HasErrors() { return nil, diags } // Load the backend be, beDiags := c.Backend(&BackendOpts{ Config: backendConfig, }) diags = diags.Append(beDiags) if beDiags.HasErrors() { return nil, diags } return be, diags } func (c *PlanCommand) OperationRequest( be backend.Enhanced, view views.Plan, args *arguments.Operation, planOutPath string, ) (*backend.Operation, tfdiags.Diagnostics) { var diags tfdiags.Diagnostics // Build the operation opReq := c.Operation(be) opReq.ConfigDir = "." opReq.PlanMode = args.PlanMode opReq.Hooks = view.Hooks() opReq.PlanRefresh = args.Refresh opReq.PlanOutPath = planOutPath opReq.Targets = args.Targets opReq.ForceReplace = args.ForceReplace opReq.Type = backend.OperationTypePlan opReq.View = view.Operation() var err error opReq.ConfigLoader, err = c.initConfigLoader() if err != nil { diags = diags.Append(fmt.Errorf("Failed to initialize config loader: %s", err)) return nil, diags } return opReq, diags } func (c *PlanCommand) GatherVariables(opReq *backend.Operation, args *arguments.Vars) tfdiags.Diagnostics { var diags tfdiags.Diagnostics // FIXME the arguments package currently trivially gathers variable related // arguments in a heterogenous slice, in order to minimize the number of // code paths gathering variables during the transition to this structure. // Once all commands that gather variables have been converted to this // structure, we could move the variable gathering code to the arguments // package directly, removing this shim layer. varArgs := args.All() items := make([]rawFlag, len(varArgs)) for i := range varArgs { items[i].Name = varArgs[i].Name items[i].Value = varArgs[i].Value } c.Meta.variableArgs = rawFlags{items: &items} opReq.Variables, diags = c.collectVariableValues() return diags } func (c *PlanCommand) Help() string { helpText := ` Usage: terraform [global options] plan [options] Generates a speculative execution plan, showing what actions Terraform would take to apply the current configuration. This command will not actually perform the planned actions. You can optionally save the plan to a file, which you can then pass to the "apply" command to perform exactly the actions described in the plan. Plan Customization Options: The following options customize how Terraform will produce its plan. You can also use these options when you run "terraform apply" without passing it a saved plan, in order to plan and apply in a single command. -destroy If set, a plan will be generated to destroy all resources managed by the given configuration and state. -refresh=false Skip checking for changes to remote objects while creating the plan. This can potentially make planning faster, but at the expense of possibly planning against a stale record of the remote system state. -replace=resource Force replacement of a particular resource instance using its resource address. If the plan would've normally produced an update or no-op action for this instance, Terraform will plan to replace it instead. -target=resource Limit the planning operation to only the given module, resource, or resource instance and all of its dependencies. You can use this option multiple times to include more than one object. This is for exceptional use only. -var 'foo=bar' Set a variable in the Terraform configuration. This flag can be set multiple times. -var-file=foo Set variables in the Terraform configuration from a file. If "terraform.tfvars" or any ".auto.tfvars" files are present, they will be automatically loaded. Other Options: -compact-warnings If Terraform produces any warnings that are not accompanied by errors, show them in a more compact form that includes only the summary messages. -detailed-exitcode Return detailed exit codes when the command exits. This will change the meaning of exit codes to: 0 - Succeeded, diff is empty (no changes) 1 - Errored 2 - Succeeded, there is a diff -input=true Ask for input for variables if not directly set. -lock=true Lock the state file when locking is supported. -lock-timeout=0s Duration to retry a state lock. -no-color If specified, output won't contain any color. -out=path Write a plan file to the given path. This can be used as input to the "apply" command. -parallelism=n Limit the number of concurrent operations. Defaults to 10. -state=statefile A legacy option used for the local backend only. See the local backend's documentation for more information. ` return strings.TrimSpace(helpText) } func (c *PlanCommand) Synopsis() string { return "Show changes required by the current configuration" }