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Copy pathoutput.go
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226 lines (184 loc) · 5.05 KB
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package command
import (
"bytes"
"flag"
"fmt"
"sort"
"strconv"
"strings"
)
// OutputCommand is a Command implementation that reads an output
// from a Terraform state and prints it.
type OutputCommand struct {
Meta
}
func (c *OutputCommand) Run(args []string) int {
args = c.Meta.process(args, false)
var module string
cmdFlags := flag.NewFlagSet("output", flag.ContinueOnError)
cmdFlags.StringVar(&c.Meta.statePath, "state", DefaultStateFilename, "path")
cmdFlags.StringVar(&module, "module", "", "module")
cmdFlags.Usage = func() { c.Ui.Error(c.Help()) }
if err := cmdFlags.Parse(args); err != nil {
return 1
}
args = cmdFlags.Args()
if len(args) > 2 {
c.Ui.Error(
"The output command expects exactly one argument with the name\n" +
"of an output variable or no arguments to show all outputs.\n")
cmdFlags.Usage()
return 1
}
name := ""
if len(args) > 0 {
name = args[0]
}
index := ""
if len(args) > 1 {
index = args[1]
}
stateStore, err := c.Meta.State()
if err != nil {
c.Ui.Error(fmt.Sprintf("Error reading state: %s", err))
return 1
}
if module == "" {
module = "root"
} else {
module = "root." + module
}
// Get the proper module we want to get outputs for
modPath := strings.Split(module, ".")
state := stateStore.State()
mod := state.ModuleByPath(modPath)
if mod == nil {
c.Ui.Error(fmt.Sprintf(
"The module %s could not be found. There is nothing to output.",
module))
return 1
}
if state.Empty() || len(mod.Outputs) == 0 {
c.Ui.Error(fmt.Sprintf(
"The state file has no outputs defined. Define an output\n" +
"in your configuration with the `output` directive and re-run\n" +
"`terraform apply` for it to become available."))
return 1
}
if name == "" {
c.Ui.Output(outputsAsString(state, nil, false))
return 0
}
v, ok := mod.Outputs[name]
if !ok {
c.Ui.Error(fmt.Sprintf(
"The output variable requested could not be found in the state\n" +
"file. If you recently added this to your configuration, be\n" +
"sure to run `terraform apply`, since the state won't be updated\n" +
"with new output variables until that command is run."))
return 1
}
switch output := v.Value.(type) {
case string:
c.Ui.Output(output)
return 0
case []interface{}:
if index == "" {
c.Ui.Output(formatListOutput("", "", output))
break
}
indexInt, err := strconv.Atoi(index)
if err != nil {
c.Ui.Error(fmt.Sprintf(
"The index %q requested is not valid for the list output\n"+
"%q - indices must be numeric, and in the range 0-%d", index, name,
len(output)-1))
break
}
if indexInt < 0 || indexInt >= len(output) {
c.Ui.Error(fmt.Sprintf(
"The index %d requested is not valid for the list output\n"+
"%q - indices must be in the range 0-%d", indexInt, name,
len(output)-1))
break
}
c.Ui.Output(fmt.Sprintf("%s", output[indexInt]))
return 0
case map[string]interface{}:
if index == "" {
c.Ui.Output(formatMapOutput("", "", output))
break
}
if value, ok := output[index]; ok {
c.Ui.Output(fmt.Sprintf("%s", value))
return 0
} else {
return 1
}
default:
c.Ui.Error(fmt.Sprintf("Unknown output type: %T", v.Type))
return 1
}
return 0
}
func formatListOutput(indent, outputName string, outputList []interface{}) string {
keyIndent := ""
outputBuf := new(bytes.Buffer)
if outputName != "" {
outputBuf.WriteString(fmt.Sprintf("%s%s = [", indent, outputName))
keyIndent = " "
}
for _, value := range outputList {
outputBuf.WriteString(fmt.Sprintf("\n%s%s%s", indent, keyIndent, value))
}
if outputName != "" {
if len(outputList) > 0 {
outputBuf.WriteString(fmt.Sprintf("\n%s]", indent))
} else {
outputBuf.WriteString("]")
}
}
return strings.TrimPrefix(outputBuf.String(), "\n")
}
func formatMapOutput(indent, outputName string, outputMap map[string]interface{}) string {
ks := make([]string, 0, len(outputMap))
for k, _ := range outputMap {
ks = append(ks, k)
}
sort.Strings(ks)
keyIndent := ""
outputBuf := new(bytes.Buffer)
if outputName != "" {
outputBuf.WriteString(fmt.Sprintf("%s%s = {", indent, outputName))
keyIndent = " "
}
for _, k := range ks {
v := outputMap[k]
outputBuf.WriteString(fmt.Sprintf("\n%s%s%s = %v", indent, keyIndent, k, v))
}
if outputName != "" {
if len(outputMap) > 0 {
outputBuf.WriteString(fmt.Sprintf("\n%s}", indent))
} else {
outputBuf.WriteString("}")
}
}
return strings.TrimPrefix(outputBuf.String(), "\n")
}
func (c *OutputCommand) Help() string {
helpText := `
Usage: terraform output [options] [NAME]
Reads an output variable from a Terraform state file and prints
the value. If NAME is not specified, all outputs are printed.
Options:
-state=path Path to the state file to read. Defaults to
"terraform.tfstate".
-no-color If specified, output won't contain any color.
-module=name If specified, returns the outputs for a
specific module
`
return strings.TrimSpace(helpText)
}
func (c *OutputCommand) Synopsis() string {
return "Read an output from a state file"
}