package command import ( "fmt" "strings" "github.com/hashicorp/terraform/plans/planfile" "github.com/hashicorp/terraform/tfdiags" "github.com/hashicorp/terraform/backend" "github.com/hashicorp/terraform/dag" "github.com/hashicorp/terraform/terraform" ) // GraphCommand is a Command implementation that takes a Terraform // configuration and outputs the dependency tree in graphical form. type GraphCommand struct { Meta } func (c *GraphCommand) Run(args []string) int { var drawCycles bool var graphTypeStr string var moduleDepth int var verbose bool var planPath string args = c.Meta.process(args) cmdFlags := c.Meta.defaultFlagSet("graph") cmdFlags.BoolVar(&drawCycles, "draw-cycles", false, "draw-cycles") cmdFlags.StringVar(&graphTypeStr, "type", "", "type") cmdFlags.IntVar(&moduleDepth, "module-depth", -1, "module-depth") cmdFlags.BoolVar(&verbose, "verbose", false, "verbose") cmdFlags.StringVar(&planPath, "plan", "", "plan") cmdFlags.Usage = func() { c.Ui.Error(c.Help()) } if err := cmdFlags.Parse(args); err != nil { c.Ui.Error(fmt.Sprintf("Error parsing command-line flags: %s\n", err.Error())) return 1 } configPath, err := ModulePath(cmdFlags.Args()) if err != nil { c.Ui.Error(err.Error()) return 1 } // Check for user-supplied plugin path if c.pluginPath, err = c.loadPluginPath(); err != nil { c.Ui.Error(fmt.Sprintf("Error loading plugin path: %s", err)) return 1 } // Try to load plan if path is specified var planFile *planfile.Reader if planPath != "" { planFile, err = c.PlanFile(planPath) if err != nil { c.Ui.Error(err.Error()) return 1 } } var diags tfdiags.Diagnostics backendConfig, backendDiags := c.loadBackendConfig(configPath) diags = diags.Append(backendDiags) if diags.HasErrors() { c.showDiagnostics(diags) return 1 } // Load the backend b, backendDiags := c.Backend(&BackendOpts{ Config: backendConfig, }) diags = diags.Append(backendDiags) if backendDiags.HasErrors() { c.showDiagnostics(diags) return 1 } // We require a local backend local, ok := b.(backend.Local) if !ok { c.showDiagnostics(diags) // in case of any warnings in here c.Ui.Error(ErrUnsupportedLocalOp) return 1 } // This is a read-only command c.ignoreRemoteBackendVersionConflict(b) // Build the operation opReq := c.Operation(b) opReq.ConfigDir = configPath opReq.ConfigLoader, err = c.initConfigLoader() opReq.PlanFile = planFile opReq.AllowUnsetVariables = true if err != nil { diags = diags.Append(err) c.showDiagnostics(diags) return 1 } // Get the context ctx, _, ctxDiags := local.Context(opReq) diags = diags.Append(ctxDiags) if ctxDiags.HasErrors() { c.showDiagnostics(diags) return 1 } // Determine the graph type graphType := terraform.GraphTypePlan if planFile != nil { graphType = terraform.GraphTypeApply } if graphTypeStr != "" { v, ok := terraform.GraphTypeMap[graphTypeStr] if !ok { c.Ui.Error(fmt.Sprintf("Invalid graph type requested: %s", graphTypeStr)) return 1 } graphType = v } // Skip validation during graph generation - we want to see the graph even if // it is invalid for some reason. g, graphDiags := ctx.Graph(graphType, &terraform.ContextGraphOpts{ Verbose: verbose, Validate: false, }) diags = diags.Append(graphDiags) if graphDiags.HasErrors() { c.showDiagnostics(diags) return 1 } graphStr, err := terraform.GraphDot(g, &dag.DotOpts{ DrawCycles: drawCycles, MaxDepth: moduleDepth, Verbose: verbose, }) if err != nil { c.Ui.Error(fmt.Sprintf("Error converting graph: %s", err)) return 1 } if diags.HasErrors() { // For this command we only show diagnostics if there are errors, // because printing out naked warnings could upset a naive program // consuming our dot output. c.showDiagnostics(diags) return 1 } c.Ui.Output(graphStr) return 0 } func (c *GraphCommand) Help() string { helpText := ` Usage: terraform graph [options] Outputs the visual execution graph of Terraform resources according to either the current configuration or an execution plan. The graph is outputted in DOT format. The typical program that can read this format is GraphViz, but many web services are also available to read this format. The -type flag can be used to control the type of graph shown. Terraform creates different graphs for different operations. See the options below for the list of types supported. The default type is "plan" if a configuration is given, and "apply" if a plan file is passed as an argument. Options: -plan=tfplan Render graph using the specified plan file instead of the configuration in the current directory. -draw-cycles Highlight any cycles in the graph with colored edges. This helps when diagnosing cycle errors. -type=plan Type of graph to output. Can be: plan, plan-destroy, apply, validate, input, refresh. -module-depth=n (deprecated) In prior versions of Terraform, specified the depth of modules to show in the output. ` return strings.TrimSpace(helpText) } func (c *GraphCommand) Synopsis() string { return "Generate a Graphviz graph of the steps in an operation" }