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package command
import (
"bufio"
"context"
"fmt"
"io"
"strings"
"github.com/chzyer/readline"
"github.com/hashicorp/packer/helper/wrappedreadline"
"github.com/hashicorp/packer/helper/wrappedstreams"
"github.com/hashicorp/packer/packer"
"github.com/posener/complete"
)
var TiniestBuilder = strings.NewReader(`{
"builders": [
{
"type":"null",
"communicator": "none"
}
]
}`)
type ConsoleCommand struct {
Meta
}
func (c *ConsoleCommand) Run(args []string) int {
ctx := context.Background()
cfg, ret := c.ParseArgs(args)
if ret != 0 {
return ret
}
return c.RunContext(ctx, cfg)
}
func (c *ConsoleCommand) ParseArgs(args []string) (*ConsoleArgs, int) {
var cfg ConsoleArgs
flags := c.Meta.FlagSet("console", FlagSetVars)
flags.Usage = func() { c.Ui.Say(c.Help()) }
cfg.AddFlagSets(flags)
if err := flags.Parse(args); err != nil {
return &cfg, 1
}
args = flags.Args()
if len(args) == 1 {
cfg.Path = args[0]
}
return &cfg, 0
}
func (c *ConsoleCommand) RunContext(ctx context.Context, cla *ConsoleArgs) int {
packerStarter, ret := c.GetConfig(&cla.MetaArgs)
if ret != 0 {
return ret
}
_ = packerStarter.Initialize()
// Determine if stdin is a pipe. If so, we evaluate directly.
if c.StdinPiped() {
return c.modePiped(packerStarter)
}
return c.modeInteractive(packerStarter)
}
func (*ConsoleCommand) Help() string {
helpText := `
Usage: packer console [options] [TEMPLATE]
Creates a console for testing variable interpolation.
If a template is provided, this command will load the template and any
variables defined therein into its context to be referenced during
interpolation.
Options:
-var 'key=value' Variable for templates, can be used multiple times.
-var-file=path JSON or HCL2 file containing user variables. [ Note that even in HCL mode this expects file to contain JSON, a fix is comming soon ]
`
return strings.TrimSpace(helpText)
}
func (*ConsoleCommand) Synopsis() string {
return "creates a console for testing variable interpolation"
}
func (*ConsoleCommand) AutocompleteArgs() complete.Predictor {
return complete.PredictNothing
}
func (*ConsoleCommand) AutocompleteFlags() complete.Flags {
return complete.Flags{
"-var": complete.PredictNothing,
"-var-file": complete.PredictNothing,
}
}
func (c *ConsoleCommand) modePiped(cfg packer.Evaluator) int {
var lastResult string
scanner := bufio.NewScanner(wrappedstreams.Stdin())
ret := 0
for scanner.Scan() {
result, _, diags := cfg.EvaluateExpression(strings.TrimSpace(scanner.Text()))
if len(diags) > 0 {
ret = writeDiags(c.Ui, nil, diags)
}
// Store the last result
lastResult = result
}
// Output the final result
c.Ui.Message(lastResult)
return ret
}
func (c *ConsoleCommand) modeInteractive(cfg packer.Evaluator) int {
// Setup the UI so we can output directly to stdout
l, err := readline.NewEx(wrappedreadline.Override(&readline.Config{
Prompt: "> ",
InterruptPrompt: "^C",
EOFPrompt: "exit",
HistorySearchFold: true,
}))
if err != nil {
c.Ui.Error(fmt.Sprintf(
"Error initializing console: %s",
err))
return 1
}
for {
// Read a line
line, err := l.Readline()
if err == readline.ErrInterrupt {
if len(line) == 0 {
break
} else {
continue
}
} else if err == io.EOF {
break
}
out, exit, diags := cfg.EvaluateExpression(line)
ret := writeDiags(c.Ui, nil, diags)
if exit {
return ret
}
c.Ui.Say(out)
if exit {
return ret
}
}
return 0
}
|
