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main.go
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main.go
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package main
import (
"bytes"
"fmt"
"io"
"os"
"sort"
"strings"
"text/tabwriter"
// These packages have init() funcs which check os.Args and drop directly
// into their command logic. This is because they are run as separate
// processes along side of a task. By early importing them we can avoid
// additional code being imported and thus reserving memory
_ "github.com/hashicorp/nomad/client/logmon"
_ "github.com/hashicorp/nomad/drivers/docker/docklog"
_ "github.com/hashicorp/nomad/drivers/shared/executor"
"github.com/hashicorp/nomad/command"
"github.com/hashicorp/nomad/version"
colorable "github.com/mattn/go-colorable"
"github.com/mitchellh/cli"
"github.com/sean-/seed"
"golang.org/x/crypto/ssh/terminal"
)
var (
// Hidden hides the commands from both help and autocomplete. Commands that
// users should not be running should be placed here, versus hiding
// subcommands from the main help, which should be filtered out of the
// commands above.
hidden = []string{
"alloc-status",
"check",
"client-config",
"eval-status",
"executor",
"keygen",
"keyring",
"logmon",
"node-drain",
"node-status",
"server-force-leave",
"server-join",
"server-members",
"syslog",
"docker_logger",
}
// aliases is the list of aliases we want users to be aware of. We hide
// these form the help output but autocomplete them.
aliases = []string{
"fs",
"init",
"inspect",
"logs",
"plan",
"validate",
}
// Common commands are grouped separately to call them out to operators.
commonCommands = []string{
"run",
"stop",
"status",
"alloc",
"job",
"node",
"agent",
}
)
func init() {
seed.Init()
}
func main() {
os.Exit(Run(os.Args[1:]))
}
func Run(args []string) int {
return RunCustom(args)
}
func RunCustom(args []string) int {
// Parse flags into env vars for global use
args = setupEnv(args)
// Create the meta object
metaPtr := new(command.Meta)
// Don't use color if disabled
color := true
if os.Getenv(command.EnvNomadCLINoColor) != "" {
color = false
}
isTerminal := terminal.IsTerminal(int(os.Stdout.Fd()))
metaPtr.Ui = &cli.BasicUi{
Reader: os.Stdin,
Writer: colorable.NewColorableStdout(),
ErrorWriter: colorable.NewColorableStderr(),
}
// The Nomad agent never outputs color
agentUi := &cli.BasicUi{
Reader: os.Stdin,
Writer: os.Stdout,
ErrorWriter: os.Stderr,
}
// Only use colored UI if stdout is a tty, and not disabled
if isTerminal && color {
metaPtr.Ui = &cli.ColoredUi{
ErrorColor: cli.UiColorRed,
WarnColor: cli.UiColorYellow,
InfoColor: cli.UiColorGreen,
Ui: metaPtr.Ui,
}
}
commands := command.Commands(metaPtr, agentUi)
cli := &cli.CLI{
Name: "nomad",
Version: version.GetVersion().FullVersionNumber(true),
Args: args,
Commands: commands,
HiddenCommands: hidden,
Autocomplete: true,
AutocompleteNoDefaultFlags: true,
HelpFunc: groupedHelpFunc(
cli.BasicHelpFunc("nomad"),
),
HelpWriter: os.Stdout,
}
exitCode, err := cli.Run()
if err != nil {
fmt.Fprintf(os.Stderr, "Error executing CLI: %s\n", err.Error())
return 1
}
return exitCode
}
func groupedHelpFunc(f cli.HelpFunc) cli.HelpFunc {
return func(commands map[string]cli.CommandFactory) string {
var b bytes.Buffer
tw := tabwriter.NewWriter(&b, 0, 2, 6, ' ', 0)
fmt.Fprintf(tw, "Usage: nomad [-version] [-help] [-autocomplete-(un)install] <command> [args]\n\n")
fmt.Fprintf(tw, "Common commands:\n")
for _, v := range commonCommands {
printCommand(tw, v, commands[v])
}
// Filter out common commands and aliased commands from the other
// commands output
otherCommands := make([]string, 0, len(commands))
for k := range commands {
found := false
for _, v := range commonCommands {
if k == v {
found = true
break
}
}
for _, v := range aliases {
if k == v {
found = true
break
}
}
if !found {
otherCommands = append(otherCommands, k)
}
}
sort.Strings(otherCommands)
fmt.Fprintf(tw, "\n")
fmt.Fprintf(tw, "Other commands:\n")
for _, v := range otherCommands {
printCommand(tw, v, commands[v])
}
tw.Flush()
return strings.TrimSpace(b.String())
}
}
func printCommand(w io.Writer, name string, cmdFn cli.CommandFactory) {
cmd, err := cmdFn()
if err != nil {
panic(fmt.Sprintf("failed to load %q command: %s", name, err))
}
fmt.Fprintf(w, " %s\t%s\n", name, cmd.Synopsis())
}
// setupEnv parses args and may replace them and sets some env vars to known
// values based on format options
func setupEnv(args []string) []string {
noColor := false
for _, arg := range args {
// Check if color is set
if arg == "-no-color" || arg == "--no-color" {
noColor = true
}
}
// Put back into the env for later
if noColor {
os.Setenv(command.EnvNomadCLINoColor, "true")
}
return args
}