340 lines
8.8 KiB
Go
340 lines
8.8 KiB
Go
package command
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import (
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"bytes"
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"encoding/json"
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"flag"
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"fmt"
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"sort"
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"strings"
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ctyjson "github.com/zclconf/go-cty/cty/json"
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"github.com/hashicorp/terraform/addrs"
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"github.com/hashicorp/terraform/config/hcl2shim"
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"github.com/hashicorp/terraform/repl"
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"github.com/hashicorp/terraform/tfdiags"
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)
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// OutputCommand is a Command implementation that reads an output
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// from a Terraform state and prints it.
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type OutputCommand struct {
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Meta
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}
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func (c *OutputCommand) Run(args []string) int {
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args, err := c.Meta.process(args, false)
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if err != nil {
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return 1
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}
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var module string
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var jsonOutput bool
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cmdFlags := flag.NewFlagSet("output", flag.ContinueOnError)
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cmdFlags.BoolVar(&jsonOutput, "json", false, "json")
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cmdFlags.StringVar(&c.Meta.statePath, "state", DefaultStateFilename, "path")
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cmdFlags.StringVar(&module, "module", "", "module")
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cmdFlags.Usage = func() { c.Ui.Error(c.Help()) }
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if err := cmdFlags.Parse(args); err != nil {
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return 1
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}
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args = cmdFlags.Args()
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if len(args) > 1 {
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c.Ui.Error(
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"The output command expects exactly one argument with the name\n" +
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"of an output variable or no arguments to show all outputs.\n")
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cmdFlags.Usage()
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return 1
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}
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name := ""
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if len(args) > 0 {
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name = args[0]
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}
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var diags tfdiags.Diagnostics
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// Load the backend
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b, backendDiags := c.Backend(nil)
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diags = diags.Append(backendDiags)
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if backendDiags.HasErrors() {
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c.showDiagnostics(diags)
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return 1
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}
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env := c.Workspace()
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// Get the state
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stateStore, err := b.StateMgr(env)
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if err != nil {
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c.Ui.Error(fmt.Sprintf("Failed to load state: %s", err))
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return 1
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}
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if err := stateStore.RefreshState(); err != nil {
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c.Ui.Error(fmt.Sprintf("Failed to load state: %s", err))
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return 1
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}
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moduleAddr := addrs.RootModuleInstance
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if module != "" {
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// This option was supported prior to 0.12.0, but no longer supported
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// because we only persist the root module outputs in state.
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// (We could perhaps re-introduce this by doing an eval walk here to
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// repopulate them, similar to how "terraform console" does it, but
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// that requires more thought since it would imply this command
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// supporting remote operations, which is a big change.)
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diags = diags.Append(tfdiags.Sourceless(
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tfdiags.Error,
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"Unsupported option",
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"The -module option is no longer supported since Terraform 0.12, because now only root outputs are persisted in the state.",
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))
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c.showDiagnostics(diags)
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return 1
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}
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state := stateStore.State()
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mod := state.Module(moduleAddr)
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if mod == nil {
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c.Ui.Error(fmt.Sprintf(
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"The module %s could not be found. There is nothing to output.",
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module))
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return 1
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}
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if !jsonOutput && (state.Empty() || len(mod.OutputValues) == 0) {
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c.Ui.Error(
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"The state file either has no outputs defined, or all the defined\n" +
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"outputs are empty. Please define an output in your configuration\n" +
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"with the `output` keyword and run `terraform refresh` for it to\n" +
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"become available. If you are using interpolation, please verify\n" +
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"the interpolated value is not empty. You can use the \n" +
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"`terraform console` command to assist.")
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return 1
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}
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if name == "" {
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if jsonOutput {
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// Due to a historical accident, the switch from state version 2 to
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// 3 caused our JSON output here to be the full metadata about the
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// outputs rather than just the output values themselves as we'd
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// show in the single value case. We must now maintain that behavior
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// for compatibility, so this is an emulation of the JSON
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// serialization of outputs used in state format version 3.
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type OutputMeta struct {
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Sensitive bool `json:"sensitive"`
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Type json.RawMessage `json:"type"`
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Value json.RawMessage `json:"value"`
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}
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outputs := map[string]OutputMeta{}
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for n, os := range mod.OutputValues {
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jsonVal, err := ctyjson.Marshal(os.Value, os.Value.Type())
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if err != nil {
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diags = diags.Append(err)
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c.showDiagnostics(diags)
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return 1
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}
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jsonType, err := ctyjson.MarshalType(os.Value.Type())
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if err != nil {
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diags = diags.Append(err)
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c.showDiagnostics(diags)
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return 1
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}
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outputs[n] = OutputMeta{
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Sensitive: os.Sensitive,
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Type: json.RawMessage(jsonType),
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Value: json.RawMessage(jsonVal),
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}
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}
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jsonOutputs, err := json.MarshalIndent(outputs, "", " ")
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if err != nil {
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diags = diags.Append(err)
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c.showDiagnostics(diags)
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return 1
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}
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c.Ui.Output(string(jsonOutputs))
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return 0
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} else {
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c.Ui.Output(outputsAsString(state, moduleAddr, nil, false))
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return 0
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}
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}
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os, ok := mod.OutputValues[name]
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if !ok {
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c.Ui.Error(fmt.Sprintf(
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"The output variable requested could not be found in the state\n" +
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"file. If you recently added this to your configuration, be\n" +
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"sure to run `terraform apply`, since the state won't be updated\n" +
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"with new output variables until that command is run."))
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return 1
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}
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v := os.Value
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if jsonOutput {
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jsonOutput, err := ctyjson.Marshal(v, v.Type())
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if err != nil {
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return 1
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}
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c.Ui.Output(string(jsonOutput))
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} else {
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// Our formatter still wants an old-style raw interface{} value, so
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// for now we'll just shim it.
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// FIXME: Port the formatter to work with cty.Value directly.
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legacyVal := hcl2shim.ConfigValueFromHCL2(v)
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result, err := repl.FormatResult(legacyVal)
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if err != nil {
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diags = diags.Append(err)
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c.showDiagnostics(diags)
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return 1
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}
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c.Ui.Output(result)
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}
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return 0
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}
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func formatNestedList(indent string, outputList []interface{}) string {
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outputBuf := new(bytes.Buffer)
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outputBuf.WriteString(fmt.Sprintf("%s[", indent))
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lastIdx := len(outputList) - 1
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for i, value := range outputList {
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outputBuf.WriteString(fmt.Sprintf("\n%s%s%s", indent, " ", value))
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if i != lastIdx {
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outputBuf.WriteString(",")
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}
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}
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outputBuf.WriteString(fmt.Sprintf("\n%s]", indent))
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return strings.TrimPrefix(outputBuf.String(), "\n")
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}
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func formatListOutput(indent, outputName string, outputList []interface{}) string {
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keyIndent := ""
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outputBuf := new(bytes.Buffer)
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if outputName != "" {
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outputBuf.WriteString(fmt.Sprintf("%s%s = [", indent, outputName))
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keyIndent = " "
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}
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lastIdx := len(outputList) - 1
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for i, value := range outputList {
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switch typedValue := value.(type) {
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case string:
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outputBuf.WriteString(fmt.Sprintf("\n%s%s%s", indent, keyIndent, value))
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case []interface{}:
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outputBuf.WriteString(fmt.Sprintf("\n%s%s", indent,
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formatNestedList(indent+keyIndent, typedValue)))
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case map[string]interface{}:
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outputBuf.WriteString(fmt.Sprintf("\n%s%s", indent,
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formatNestedMap(indent+keyIndent, typedValue)))
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}
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if lastIdx != i {
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outputBuf.WriteString(",")
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}
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}
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if outputName != "" {
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if len(outputList) > 0 {
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outputBuf.WriteString(fmt.Sprintf("\n%s]", indent))
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} else {
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outputBuf.WriteString("]")
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}
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}
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return strings.TrimPrefix(outputBuf.String(), "\n")
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}
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func formatNestedMap(indent string, outputMap map[string]interface{}) string {
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ks := make([]string, 0, len(outputMap))
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for k, _ := range outputMap {
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ks = append(ks, k)
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}
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sort.Strings(ks)
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outputBuf := new(bytes.Buffer)
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outputBuf.WriteString(fmt.Sprintf("%s{", indent))
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lastIdx := len(outputMap) - 1
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for i, k := range ks {
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v := outputMap[k]
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outputBuf.WriteString(fmt.Sprintf("\n%s%s = %v", indent+" ", k, v))
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if lastIdx != i {
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outputBuf.WriteString(",")
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}
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}
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outputBuf.WriteString(fmt.Sprintf("\n%s}", indent))
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return strings.TrimPrefix(outputBuf.String(), "\n")
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}
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func formatMapOutput(indent, outputName string, outputMap map[string]interface{}) string {
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ks := make([]string, 0, len(outputMap))
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for k, _ := range outputMap {
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ks = append(ks, k)
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}
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sort.Strings(ks)
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keyIndent := ""
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outputBuf := new(bytes.Buffer)
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if outputName != "" {
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outputBuf.WriteString(fmt.Sprintf("%s%s = {", indent, outputName))
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keyIndent = " "
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}
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for _, k := range ks {
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v := outputMap[k]
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outputBuf.WriteString(fmt.Sprintf("\n%s%s%s = %v", indent, keyIndent, k, v))
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}
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if outputName != "" {
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if len(outputMap) > 0 {
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outputBuf.WriteString(fmt.Sprintf("\n%s}", indent))
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} else {
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outputBuf.WriteString("}")
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}
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}
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return strings.TrimPrefix(outputBuf.String(), "\n")
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}
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func (c *OutputCommand) Help() string {
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helpText := `
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Usage: terraform output [options] [NAME]
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Reads an output variable from a Terraform state file and prints
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the value. With no additional arguments, output will display all
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the outputs for the root module. If NAME is not specified, all
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outputs are printed.
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Options:
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-state=path Path to the state file to read. Defaults to
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"terraform.tfstate".
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-no-color If specified, output won't contain any color.
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-json If specified, machine readable output will be
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printed in JSON format
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`
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return strings.TrimSpace(helpText)
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}
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func (c *OutputCommand) Synopsis() string {
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return "Read an output from a state file"
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}
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