93 lines
2.1 KiB
Go
93 lines
2.1 KiB
Go
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package command
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import (
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"flag"
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"fmt"
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"os"
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"strings"
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"github.com/hashicorp/terraform/terraform"
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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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var statePath string
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args = c.Meta.process(args)
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cmdFlags := flag.NewFlagSet("output", flag.ContinueOnError)
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cmdFlags.StringVar(&statePath, "state", DefaultStateFilename, "path")
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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.\n")
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cmdFlags.Usage()
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return 1
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}
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name := args[0]
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f, err := os.Open(statePath)
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if err != nil {
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c.Ui.Error(fmt.Sprintf("Error loading file: %s", err))
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return 1
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}
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state, err := terraform.ReadState(f)
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f.Close()
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if err != nil {
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c.Ui.Error(fmt.Sprintf("Error reading state: %s", err))
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return 1
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}
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if len(state.Outputs) == 0 {
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c.Ui.Error(fmt.Sprintf(
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"The state file has no outputs defined. Define an output\n" +
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"in your configuration with the `output` directive and re-run\n" +
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"`terraform apply` for it to become available."))
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return 1
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}
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v, ok := state.Outputs[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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c.Ui.Output(v)
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return 0
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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.
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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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`
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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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