forked from canonical/lxd
/
main.go
348 lines (294 loc) · 8.64 KB
/
main.go
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package main
import (
"fmt"
"os"
"os/exec"
"path"
"strings"
"syscall"
"github.com/lxc/lxd"
"github.com/lxc/lxd/shared"
"github.com/lxc/lxd/shared/gnuflag"
"github.com/lxc/lxd/shared/i18n"
"github.com/lxc/lxd/shared/logging"
)
var configPath string
func main() {
if err := run(); err != nil {
msg := fmt.Sprintf(i18n.G("error: %v"), err)
lxdErr := lxd.GetLocalLXDErr(err)
switch lxdErr {
case syscall.ENOENT:
msg = i18n.G("LXD socket not found; is LXD installed and running?")
case syscall.ECONNREFUSED:
msg = i18n.G("Connection refused; is LXD running?")
case syscall.EACCES:
msg = i18n.G("Permission denied, are you in the lxd group?")
}
fmt.Fprintln(os.Stderr, fmt.Sprintf("%s", msg))
os.Exit(1)
}
}
func run() error {
verbose := gnuflag.Bool("verbose", false, i18n.G("Enables verbose mode."))
debug := gnuflag.Bool("debug", false, i18n.G("Enables debug mode."))
forceLocal := gnuflag.Bool("force-local", false, i18n.G("Force using the local unix socket."))
noAlias := gnuflag.Bool("no-alias", false, i18n.G("Ignore aliases when determining what command to run."))
configDir := "$HOME/.config/lxc"
if os.Getenv("LXD_CONF") != "" {
configDir = os.Getenv("LXD_CONF")
}
configPath = os.ExpandEnv(path.Join(configDir, "config.yml"))
if len(os.Args) >= 3 && os.Args[1] == "config" && os.Args[2] == "profile" {
fmt.Fprintf(os.Stderr, i18n.G("`lxc config profile` is deprecated, please use `lxc profile`")+"\n")
os.Args = append(os.Args[:1], os.Args[2:]...)
}
if len(os.Args) >= 2 && (os.Args[1] == "-h" || os.Args[1] == "--help") {
os.Args[1] = "help"
}
if len(os.Args) >= 2 && (os.Args[1] == "--all") {
os.Args[1] = "help"
os.Args = append(os.Args, "--all")
}
if len(os.Args) == 2 && os.Args[1] == "--version" {
os.Args[1] = "version"
}
if len(os.Args) == 2 && os.Args[1] == "--man" {
os.Args[1] = "manpage"
}
if len(os.Args) < 2 {
commands["help"].run(nil, nil)
os.Exit(1)
}
var config *lxd.Config
var err error
if *forceLocal {
config = &lxd.DefaultConfig
} else {
config, err = lxd.LoadConfig(configPath)
if err != nil {
return err
}
}
// This is quite impolite, but it seems gnuflag needs us to shift our
// own exename out of the arguments before parsing them. However, this
// is useful for execIfAlias, which wants to know exactly the command
// line we received, and in some cases is called before this shift, and
// in others after. So, let's save the original args.
origArgs := os.Args
name := os.Args[1]
/* at this point we haven't parsed the args, so we have to look for
* --no-alias by hand.
*/
if !shared.StringInSlice("--no-alias", origArgs) {
execIfAliases(config, origArgs)
}
cmd, ok := commands[name]
if !ok {
commands["help"].run(nil, nil)
fmt.Fprintf(os.Stderr, "\n"+i18n.G("error: unknown command: %s")+"\n", name)
os.Exit(1)
}
cmd.flags()
gnuflag.Usage = func() {
fmt.Fprintf(os.Stderr, i18n.G("Usage: %s")+"\n\n"+i18n.G("Options:")+"\n\n", strings.TrimSpace(cmd.usage()))
gnuflag.PrintDefaults()
}
os.Args = os.Args[1:]
gnuflag.Parse(true)
shared.Log, err = logging.GetLogger("", "", *verbose, *debug, nil)
if err != nil {
return err
}
// If the user is running a command that may attempt to connect to the local daemon
// and this is the first time the client has been run by the user, then check to see
// if LXD has been properly configured. Don't display the message if the var path
// does not exist (LXD not installed), as the user may be targeting a remote daemon.
if os.Args[0] != "help" && os.Args[0] != "version" && shared.PathExists(shared.VarPath("")) && !shared.PathExists(config.ConfigDir) {
// Create the config dir so that we don't get in here again for this user.
err = os.MkdirAll(config.ConfigDir, 0750)
if err != nil {
return err
}
fmt.Fprintf(os.Stderr, i18n.G("If this is your first time using LXD, you should also run: sudo lxd init")+"\n")
fmt.Fprintf(os.Stderr, i18n.G("To start your first container, try: lxc launch ubuntu:16.04")+"\n\n")
}
err = cmd.run(config, gnuflag.Args())
if err == errArgs {
/* If we got an error about invalid arguments, let's try to
* expand this as an alias
*/
if !*noAlias {
execIfAliases(config, origArgs)
}
fmt.Fprintf(os.Stderr, "%s\n\n"+i18n.G("error: %v")+"\n", cmd.usage(), err)
os.Exit(1)
}
return err
}
type command interface {
usage() string
flags()
showByDefault() bool
run(config *lxd.Config, args []string) error
}
var commands = map[string]command{
"config": &configCmd{},
"copy": ©Cmd{},
"delete": &deleteCmd{},
"exec": &execCmd{},
"file": &fileCmd{},
"finger": &fingerCmd{},
"help": &helpCmd{},
"image": &imageCmd{},
"info": &infoCmd{},
"init": &initCmd{},
"launch": &launchCmd{},
"list": &listCmd{},
"manpage": &manpageCmd{},
"monitor": &monitorCmd{},
"move": &moveCmd{},
"network": &networkCmd{},
"pause": &actionCmd{
action: shared.Freeze,
name: "pause",
additionalHelp: i18n.G("The opposite of `lxc pause` is `lxc start`."),
},
"profile": &profileCmd{},
"publish": &publishCmd{},
"remote": &remoteCmd{},
"restart": &actionCmd{
action: shared.Restart,
hasTimeout: true,
visible: true,
name: "restart",
timeout: -1,
},
"restore": &restoreCmd{},
"snapshot": &snapshotCmd{},
"start": &actionCmd{
action: shared.Start,
visible: true,
name: "start",
},
"stop": &actionCmd{
action: shared.Stop,
hasTimeout: true,
visible: true,
name: "stop",
timeout: -1,
},
"version": &versionCmd{},
}
// defaultAliases contains LXC's built-in command line aliases. The built-in
// aliases are checked only if no user-defined alias was found.
var defaultAliases = map[string]string{
"shell": "exec @ARGS@ -- login -f root",
"cp": "copy",
"ls": "list",
"mv": "move",
"rename": "move",
"rm": "delete",
"image cp": "image copy",
"image ls": "image list",
"image rm": "image delete",
"image alias ls": "image alias list",
"image alias rm": "image alias delete",
"remote ls": "remote list",
"remote mv": "remote rename",
"remote rm": "remote remove",
"config device ls": "config device list",
"config device rm": "config device remove",
}
var errArgs = fmt.Errorf(i18n.G("wrong number of subcommand arguments"))
func findAlias(aliases map[string]string, origArgs []string) ([]string, []string, bool) {
foundAlias := false
aliasKey := []string{}
aliasValue := []string{}
for k, v := range aliases {
foundAlias = true
for i, key := range strings.Split(k, " ") {
if len(origArgs) <= i+1 || origArgs[i+1] != key {
foundAlias = false
break
}
}
if foundAlias {
aliasKey = strings.Split(k, " ")
aliasValue = strings.Split(v, " ")
break
}
}
return aliasKey, aliasValue, foundAlias
}
func expandAlias(config *lxd.Config, origArgs []string) ([]string, bool) {
aliasKey, aliasValue, foundAlias := findAlias(config.Aliases, origArgs)
if !foundAlias {
aliasKey, aliasValue, foundAlias = findAlias(defaultAliases, origArgs)
if !foundAlias {
return []string{}, false
}
}
newArgs := []string{origArgs[0]}
hasReplacedArgsVar := false
for i, aliasArg := range aliasValue {
if aliasArg == "@ARGS@" && len(origArgs) > i {
newArgs = append(newArgs, origArgs[i+1:]...)
hasReplacedArgsVar = true
} else {
newArgs = append(newArgs, aliasArg)
}
}
if !hasReplacedArgsVar {
/* add the rest of the arguments */
newArgs = append(newArgs, origArgs[len(aliasKey)+1:]...)
}
/* don't re-do aliases the next time; this allows us to have recursive
* aliases, e.g. `lxc list` to `lxc list -c n`
*/
newArgs = append(newArgs[:2], append([]string{"--no-alias"}, newArgs[2:]...)...)
return newArgs, true
}
func execIfAliases(config *lxd.Config, origArgs []string) {
newArgs, expanded := expandAlias(config, origArgs)
if !expanded {
return
}
path, err := exec.LookPath(origArgs[0])
if err != nil {
fmt.Fprintf(os.Stderr, i18n.G("processing aliases failed %s\n"), err)
os.Exit(5)
}
ret := syscall.Exec(path, newArgs, syscall.Environ())
fmt.Fprintf(os.Stderr, i18n.G("processing aliases failed %s\n"), ret)
os.Exit(5)
}
type ProgressRenderer struct {
Format string
maxLength int
}
func (p *ProgressRenderer) Done(msg string) {
if msg != "" {
msg += "\n"
}
if len(msg) > p.maxLength {
p.maxLength = len(msg)
} else {
fmt.Printf("\r%s", strings.Repeat(" ", p.maxLength))
}
fmt.Print("\r")
fmt.Print(msg)
}
func (p *ProgressRenderer) Update(status string) {
msg := "%s"
if p.Format != "" {
msg = p.Format
}
msg = fmt.Sprintf("\r"+msg, status)
if len(msg) > p.maxLength {
p.maxLength = len(msg)
} else {
fmt.Printf("\r%s", strings.Repeat(" ", p.maxLength))
}
fmt.Print(msg)
}