terraform/internal/command/graph.go

225 lines
6.2 KiB
Go

package command
import (
"fmt"
"strings"
"github.com/hashicorp/terraform/internal/backend"
"github.com/hashicorp/terraform/internal/dag"
"github.com/hashicorp/terraform/internal/plans"
"github.com/hashicorp/terraform/internal/plans/planfile"
"github.com/hashicorp/terraform/internal/terraform"
"github.com/hashicorp/terraform/internal/tfdiags"
)
// 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
lr, _, ctxDiags := local.LocalRun(opReq)
diags = diags.Append(ctxDiags)
if ctxDiags.HasErrors() {
c.showDiagnostics(diags)
return 1
}
if graphTypeStr == "" {
switch {
case lr.Plan != nil:
graphTypeStr = "apply"
default:
graphTypeStr = "plan"
}
}
var g *terraform.Graph
var graphDiags tfdiags.Diagnostics
switch graphTypeStr {
case "plan":
g, graphDiags = lr.Core.PlanGraphForUI(lr.Config, lr.InputState, plans.NormalMode)
case "plan-refresh-only":
g, graphDiags = lr.Core.PlanGraphForUI(lr.Config, lr.InputState, plans.RefreshOnlyMode)
case "plan-destroy":
g, graphDiags = lr.Core.PlanGraphForUI(lr.Config, lr.InputState, plans.DestroyMode)
case "apply":
plan := lr.Plan
// Historically "terraform graph" would allow the nonsensical request to
// render an apply graph without a plan, so we continue to support that
// here, though perhaps one day this should be an error.
if lr.Plan == nil {
plan = &plans.Plan{
Changes: plans.NewChanges(),
UIMode: plans.NormalMode,
PriorState: lr.InputState,
PrevRunState: lr.InputState,
}
}
g, graphDiags = lr.Core.ApplyGraphForUI(plan, lr.Config)
case "eval", "validate":
// Terraform v0.12 through v1.0 supported both of these, but the
// graph variants for "eval" and "validate" are purely implementation
// details and don't reveal anything (user-model-wise) that you can't
// see in the plan graph.
graphDiags = graphDiags.Append(tfdiags.Sourceless(
tfdiags.Error,
"Graph type no longer available",
fmt.Sprintf("The graph type %q is no longer available. Use -type=plan instead to get a similar result.", graphTypeStr),
))
default:
graphDiags = graphDiags.Append(tfdiags.Sourceless(
tfdiags.Error,
"Unsupported graph type",
`The -type=... argument must be either "plan", "plan-refresh-only", "plan-destroy", or "apply".`,
))
}
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 [global options] graph [options]
Produces a representation of the dependency graph between different
objects in the current configuration and state.
The graph is presented in the DOT language. The typical program that can
read this format is GraphViz, but many web services are also available
to read this format.
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-refresh-only,
plan-destroy, or apply. By default Terraform chooses
"plan", or "apply" if you also set the -plan=... option.
-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"
}