terraform/command/console.go

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package command
import (
"bufio"
"fmt"
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"strings"
"github.com/hashicorp/terraform/addrs"
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"github.com/hashicorp/terraform/backend"
"github.com/hashicorp/terraform/helper/wrappedstreams"
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"github.com/hashicorp/terraform/repl"
"github.com/hashicorp/terraform/tfdiags"
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"github.com/mitchellh/cli"
)
// ConsoleCommand is a Command implementation that applies a Terraform
// configuration and actually builds or changes infrastructure.
type ConsoleCommand struct {
Meta
}
func (c *ConsoleCommand) Run(args []string) int {
args = c.Meta.process(args)
cmdFlags := c.Meta.extendedFlagSet("console")
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cmdFlags.StringVar(&c.Meta.statePath, "state", DefaultStateFilename, "path")
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()))
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return 1
}
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configPath, err := ModulePath(cmdFlags.Args())
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if err != nil {
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c.Ui.Error(err.Error())
return 1
}
// Check for user-supplied plugin path
if c.pluginPath, err = c.loadPluginPath(); err != nil {
c.Ui.Error(fmt.Sprintf("Error loading plugin path: %s", err))
return 1
}
var diags tfdiags.Diagnostics
backendConfig, backendDiags := c.loadBackendConfig(configPath)
diags = diags.Append(backendDiags)
if diags.HasErrors() {
c.showDiagnostics(diags)
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return 1
}
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// Load the backend
b, backendDiags := c.Backend(&BackendOpts{
Config: backendConfig,
})
diags = diags.Append(backendDiags)
if backendDiags.HasErrors() {
c.showDiagnostics(diags)
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return 1
}
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// We require a local backend
local, ok := b.(backend.Local)
if !ok {
c.showDiagnostics(diags) // in case of any warnings in here
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c.Ui.Error(ErrUnsupportedLocalOp)
return 1
}
// Build the operation
opReq := c.Operation(b)
opReq.ConfigDir = configPath
opReq.ConfigLoader, err = c.initConfigLoader()
opReq.AllowUnsetVariables = true // we'll just evaluate them as unknown
if err != nil {
diags = diags.Append(err)
c.showDiagnostics(diags)
return 1
}
{
var moreDiags tfdiags.Diagnostics
opReq.Variables, moreDiags = c.collectVariableValues()
diags = diags.Append(moreDiags)
if moreDiags.HasErrors() {
c.showDiagnostics(diags)
return 1
}
}
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// Get the context
ctx, _, ctxDiags := local.Context(opReq)
diags = diags.Append(ctxDiags)
if ctxDiags.HasErrors() {
c.showDiagnostics(diags)
return 1
}
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// Successfully creating the context can result in a lock, so ensure we release it
defer func() {
err := opReq.StateLocker.Unlock(nil)
if err != nil {
c.Ui.Error(err.Error())
}
}()
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// Setup the UI so we can output directly to stdout
ui := &cli.BasicUi{
Writer: wrappedstreams.Stdout(),
ErrorWriter: wrappedstreams.Stderr(),
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}
// Before we can evaluate expressions, we must compute and populate any
// derived values (input variables, local values, output values)
// that are not stored in the persistent state.
scope, scopeDiags := ctx.Eval(addrs.RootModuleInstance)
diags = diags.Append(scopeDiags)
if scope == nil {
// scope is nil if there are errors so bad that we can't even build a scope.
// Otherwise, we'll try to eval anyway.
c.showDiagnostics(diags)
return 1
}
if diags.HasErrors() {
diags = diags.Append(tfdiags.SimpleWarning("Due to the problems above, some expressions may produce unexpected results."))
}
// Before we become interactive we'll show any diagnostics we encountered
// during initialization, and then afterwards the driver will manage any
// further diagnostics itself.
c.showDiagnostics(diags)
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// IO Loop
session := &repl.Session{
Scope: scope,
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}
// 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() {
result, exit, diags := session.Handle(strings.TrimSpace(scanner.Text()))
if diags.HasErrors() {
// In piped mode we'll exit immediately on error.
c.showDiagnostics(diags)
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return 1
}
if exit {
return 0
}
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// 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
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a file. If "terraform.tfvars" or any ".auto.tfvars"
files are present, they will be automatically loaded.
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`
return strings.TrimSpace(helpText)
}
func (c *ConsoleCommand) Synopsis() string {
return "Interactive console for Terraform interpolations"
}