package command import ( "encoding/json" "fmt" "path/filepath" "strings" "github.com/zclconf/go-cty/cty" "github.com/hashicorp/terraform/terraform" "github.com/hashicorp/terraform/tfdiags" ) // ValidateCommand is a Command implementation that validates the terraform files type ValidateCommand struct { Meta } const defaultPath = "." func (c *ValidateCommand) Run(args []string) int { args, err := c.Meta.process(args, true) if err != nil { return 1 } if c.Meta.variableArgs.items == nil { c.Meta.variableArgs = newRawFlags("-var") } varValues := c.Meta.variableArgs.Alias("-var") varFiles := c.Meta.variableArgs.Alias("-var-file") var jsonOutput bool cmdFlags := c.Meta.defaultFlagSet("validate") cmdFlags.BoolVar(&jsonOutput, "json", false, "produce JSON output") cmdFlags.Var(varValues, "var", "variables") cmdFlags.Var(varFiles, "var-file", "variable file") 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 } // After this point, we must only produce JSON output if JSON mode is // enabled, so all errors should be accumulated into diags and we'll // print out a suitable result at the end, depending on the format // selection. All returns from this point on must be tail-calls into // c.showResults in order to produce the expected output. var diags tfdiags.Diagnostics args = cmdFlags.Args() var dirPath string if len(args) == 1 { dirPath = args[0] } else { dirPath = "." } dir, err := filepath.Abs(dirPath) if err != nil { diags = diags.Append(fmt.Errorf("unable to locate module: %s", err)) return c.showResults(diags, jsonOutput) } // Check for user-supplied plugin path if c.pluginPath, err = c.loadPluginPath(); err != nil { diags = diags.Append(fmt.Errorf("error loading plugin path: %s", err)) return c.showResults(diags, jsonOutput) } validateDiags := c.validate(dir) diags = diags.Append(validateDiags) return c.showResults(diags, jsonOutput) } func (c *ValidateCommand) validate(dir string) tfdiags.Diagnostics { var diags tfdiags.Diagnostics cfg, cfgDiags := c.loadConfig(dir) diags = diags.Append(cfgDiags) if diags.HasErrors() { return diags } // "validate" is to check if the given module is valid regardless of // input values, current state, etc. Therefore we populate all of the // input values with unknown values of the expected type, allowing us // to perform a type check without assuming any particular values. varValues := make(terraform.InputValues) for name, variable := range cfg.Module.Variables { ty := variable.Type if ty == cty.NilType { // Can't predict the type at all, so we'll just mark it as // cty.DynamicVal (unknown value of cty.DynamicPseudoType). ty = cty.DynamicPseudoType } varValues[name] = &terraform.InputValue{ Value: cty.UnknownVal(ty), SourceType: terraform.ValueFromCLIArg, } } opts := c.contextOpts() opts.Config = cfg opts.Variables = varValues tfCtx, ctxDiags := terraform.NewContext(opts) diags = diags.Append(ctxDiags) if ctxDiags.HasErrors() { return diags } validateDiags := tfCtx.Validate() diags = diags.Append(validateDiags) return diags } func (c *ValidateCommand) showResults(diags tfdiags.Diagnostics, jsonOutput bool) int { switch { case jsonOutput: // FIXME: Eventually we'll probably want to factor this out somewhere // to support machine-readable outputs for other commands too, but for // now it's simplest to do this inline here. type Pos struct { Line int `json:"line"` Column int `json:"column"` Byte int `json:"byte"` } type Range struct { Filename string `json:"filename"` Start Pos `json:"start"` End Pos `json:"end"` } type Diagnostic struct { Severity string `json:"severity,omitempty"` Summary string `json:"summary,omitempty"` Detail string `json:"detail,omitempty"` Range *Range `json:"range,omitempty"` } type Output struct { // We include some summary information that is actually redundant // with the detailed diagnostics, but avoids the need for callers // to re-implement our logic for deciding these. Valid bool `json:"valid"` ErrorCount int `json:"error_count"` WarningCount int `json:"warning_count"` Diagnostics []Diagnostic `json:"diagnostics"` } var output Output output.Valid = true // until proven otherwise for _, diag := range diags { var jsonDiag Diagnostic switch diag.Severity() { case tfdiags.Error: jsonDiag.Severity = "error" output.ErrorCount++ output.Valid = false case tfdiags.Warning: jsonDiag.Severity = "warning" output.WarningCount++ } desc := diag.Description() jsonDiag.Summary = desc.Summary jsonDiag.Detail = desc.Detail ranges := diag.Source() if ranges.Subject != nil { subj := ranges.Subject jsonDiag.Range = &Range{ Filename: subj.Filename, Start: Pos{ Line: subj.Start.Line, Column: subj.Start.Column, Byte: subj.Start.Byte, }, End: Pos{ Line: subj.End.Line, Column: subj.End.Column, Byte: subj.End.Byte, }, } } output.Diagnostics = append(output.Diagnostics, jsonDiag) } if output.Diagnostics == nil { // Make sure this always appears as an array in our output, since // this is easier to consume for dynamically-typed languages. output.Diagnostics = []Diagnostic{} } j, err := json.MarshalIndent(&output, "", " ") if err != nil { // Should never happen because we fully-control the input here panic(err) } c.Ui.Output(string(j)) default: if len(diags) == 0 { c.Ui.Output(c.Colorize().Color("[green][bold]Success![reset] The configuration is valid.\n")) } else { c.showDiagnostics(diags) if !diags.HasErrors() { c.Ui.Output(c.Colorize().Color("[green][bold]Success![reset] The configuration is valid, but there were some validation warnings as shown above.\n")) } } } if diags.HasErrors() { return 1 } return 0 } func (c *ValidateCommand) Synopsis() string { return "Validates the Terraform files" } func (c *ValidateCommand) Help() string { helpText := ` Usage: terraform validate [options] [dir] Validate the configuration files in a directory, referring only to the configuration and not accessing any remote services such as remote state, provider APIs, etc. Validate runs checks that verify whether a configuration is internally-consistent, regardless of any provided variables or existing state. It is thus primarily useful for general verification of reusable modules, including correctness of attribute names and value types. It is safe to run this command automatically, for example as a post-save check in a text editor or as a test step for a re-usable module in a CI system. Validation requires an initialized working directory with any referenced plugins and modules installed. To initialize a working directory for validation without accessing any configured remote backend, use: terraform init -backend=false If dir is not specified, then the current directory will be used. To verify configuration in the context of a particular run (a particular target workspace, operation variables, etc), use the terraform plan subcommand instead, which includes an implied validation check. Options: -json Produce output in a machine-readable JSON format, suitable for use in e.g. text editor integrations. ` return strings.TrimSpace(helpText) }