terraform/command/console.go

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2016-11-14 07:18:18 +01:00
package command
import (
"bufio"
"fmt"
"os"
"strings"
"github.com/hashicorp/terraform/helper/wrappedstreams"
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"github.com/hashicorp/terraform/repl"
"github.com/mitchellh/cli"
)
// ConsoleCommand is a Command implementation that applies a Terraform
// configuration and actually builds or changes infrastructure.
type ConsoleCommand struct {
Meta
// When this channel is closed, the apply will be cancelled.
ShutdownCh <-chan struct{}
}
func (c *ConsoleCommand) Run(args []string) int {
args = c.Meta.process(args, true)
cmdFlags := c.Meta.flagSet("console")
cmdFlags.StringVar(&c.Meta.statePath, "state", DefaultStateFilename, "path")
cmdFlags.Usage = func() { c.Ui.Error(c.Help()) }
if err := cmdFlags.Parse(args); err != nil {
return 1
}
pwd, err := os.Getwd()
if err != nil {
c.Ui.Error(fmt.Sprintf("Error getting pwd: %s", err))
return 1
}
var configPath string
args = cmdFlags.Args()
if len(args) > 1 {
c.Ui.Error("The console command expects at most one argument.")
cmdFlags.Usage()
return 1
} else if len(args) == 1 {
configPath = args[0]
} else {
configPath = pwd
}
// Build the context based on the arguments given
ctx, _, err := c.Context(contextOpts{
Path: configPath,
PathEmptyOk: true,
StatePath: c.Meta.statePath,
})
if err != nil {
c.Ui.Error(err.Error())
return 1
}
// Setup the UI so we can output directly to stdout
ui := &cli.BasicUi{
Writer: wrappedstreams.Stdout(),
ErrorWriter: wrappedstreams.Stderr(),
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}
// IO Loop
session := &repl.Session{
Interpolater: ctx.Interpolater(),
}
// Determine if stdin is a pipe. If so, we evaluate directly.
if c.StdinPiped() {
return c.modePiped(session, ui)
}
return c.modeInteractive(session, ui)
}
func (c *ConsoleCommand) modePiped(session *repl.Session, ui cli.Ui) int {
var lastResult string
scanner := bufio.NewScanner(wrappedstreams.Stdin())
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for scanner.Scan() {
// Handle it. If there is an error exit immediately
result, err := session.Handle(strings.TrimSpace(scanner.Text()))
if err != nil {
ui.Error(err.Error())
return 1
}
// Store the last result
lastResult = result
}
// Output the final result
ui.Output(lastResult)
return 0
}
func (c *ConsoleCommand) Help() string {
helpText := `
Usage: terraform console [options] [DIR]
Starts an interactive console for experimenting with Terraform
interpolations.
This will open an interactive console that you can use to type
interpolations into and inspect their values. This command loads the
current state. This lets you explore and test interpolations before
using them in future configurations.
This command will never modify your state.
DIR can be set to a directory with a Terraform state to load. By
default, this will default to the current working directory.
Options:
-state=path Path to read state. Defaults to "terraform.tfstate"
-var 'foo=bar' Set a variable in the Terraform configuration. This
flag can be set multiple times.
-var-file=foo Set variables in the Terraform configuration from
a file. If "terraform.tfvars" is present, it will be
automatically loaded if this flag is not specified.
`
return strings.TrimSpace(helpText)
}
func (c *ConsoleCommand) Synopsis() string {
return "Interactive console for Terraform interpolations"
}