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cobra.go
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cobra.go
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package cli
import (
"fmt"
"os"
"strings"
pluginmanager "github.com/docker/cli/cli-plugins/manager"
"github.com/docker/cli/cli/command"
cliconfig "github.com/docker/cli/cli/config"
cliflags "github.com/docker/cli/cli/flags"
"github.com/moby/term"
"github.com/morikuni/aec"
"github.com/pkg/errors"
"github.com/spf13/cobra"
"github.com/spf13/pflag"
)
// setupCommonRootCommand contains the setup common to
// SetupRootCommand and SetupPluginRootCommand.
func setupCommonRootCommand(rootCmd *cobra.Command) (*cliflags.ClientOptions, *pflag.FlagSet, *cobra.Command) {
opts := cliflags.NewClientOptions()
flags := rootCmd.Flags()
flags.StringVar(&opts.ConfigDir, "config", cliconfig.Dir(), "Location of client config files")
opts.Common.InstallFlags(flags)
cobra.AddTemplateFunc("add", func(a, b int) int { return a + b })
cobra.AddTemplateFunc("hasSubCommands", hasSubCommands)
cobra.AddTemplateFunc("hasManagementSubCommands", hasManagementSubCommands)
cobra.AddTemplateFunc("hasInvalidPlugins", hasInvalidPlugins)
cobra.AddTemplateFunc("operationSubCommands", operationSubCommands)
cobra.AddTemplateFunc("managementSubCommands", managementSubCommands)
cobra.AddTemplateFunc("invalidPlugins", invalidPlugins)
cobra.AddTemplateFunc("wrappedFlagUsages", wrappedFlagUsages)
cobra.AddTemplateFunc("vendorAndVersion", vendorAndVersion)
cobra.AddTemplateFunc("invalidPluginReason", invalidPluginReason)
cobra.AddTemplateFunc("isPlugin", isPlugin)
cobra.AddTemplateFunc("isExperimental", isExperimental)
cobra.AddTemplateFunc("hasAdditionalHelp", hasAdditionalHelp)
cobra.AddTemplateFunc("additionalHelp", additionalHelp)
cobra.AddTemplateFunc("decoratedName", decoratedName)
rootCmd.SetUsageTemplate(usageTemplate)
rootCmd.SetHelpTemplate(helpTemplate)
rootCmd.SetFlagErrorFunc(FlagErrorFunc)
rootCmd.SetHelpCommand(helpCommand)
rootCmd.PersistentFlags().BoolP("help", "h", false, "Print usage")
rootCmd.PersistentFlags().MarkShorthandDeprecated("help", "please use --help")
rootCmd.PersistentFlags().Lookup("help").Hidden = true
rootCmd.Annotations = map[string]string{"additionalHelp": "To get more help with docker, check out our guides at https://docs.docker.com/go/guides/"}
return opts, flags, helpCommand
}
// SetupRootCommand sets default usage, help, and error handling for the
// root command.
func SetupRootCommand(rootCmd *cobra.Command) (*cliflags.ClientOptions, *pflag.FlagSet, *cobra.Command) {
opts, flags, helpCmd := setupCommonRootCommand(rootCmd)
rootCmd.SetVersionTemplate("Docker version {{.Version}}\n")
return opts, flags, helpCmd
}
// SetupPluginRootCommand sets default usage, help and error handling for a plugin root command.
func SetupPluginRootCommand(rootCmd *cobra.Command) (*cliflags.ClientOptions, *pflag.FlagSet) {
opts, flags, _ := setupCommonRootCommand(rootCmd)
return opts, flags
}
// FlagErrorFunc prints an error message which matches the format of the
// docker/cli/cli error messages
func FlagErrorFunc(cmd *cobra.Command, err error) error {
if err == nil {
return nil
}
usage := ""
if cmd.HasSubCommands() {
usage = "\n\n" + cmd.UsageString()
}
return StatusError{
Status: fmt.Sprintf("%s\nSee '%s --help'.%s", err, cmd.CommandPath(), usage),
StatusCode: 125,
}
}
// TopLevelCommand encapsulates a top-level cobra command (either
// docker CLI or a plugin) and global flag handling logic necessary
// for plugins.
type TopLevelCommand struct {
cmd *cobra.Command
dockerCli *command.DockerCli
opts *cliflags.ClientOptions
flags *pflag.FlagSet
args []string
}
// NewTopLevelCommand returns a new TopLevelCommand object
func NewTopLevelCommand(cmd *cobra.Command, dockerCli *command.DockerCli, opts *cliflags.ClientOptions, flags *pflag.FlagSet) *TopLevelCommand {
return &TopLevelCommand{cmd, dockerCli, opts, flags, os.Args[1:]}
}
// SetArgs sets the args (default os.Args[:1] used to invoke the command
func (tcmd *TopLevelCommand) SetArgs(args []string) {
tcmd.args = args
tcmd.cmd.SetArgs(args)
}
// SetFlag sets a flag in the local flag set of the top-level command
func (tcmd *TopLevelCommand) SetFlag(name, value string) {
tcmd.cmd.Flags().Set(name, value)
}
// HandleGlobalFlags takes care of parsing global flags defined on the
// command, it returns the underlying cobra command and the args it
// will be called with (or an error).
//
// On success the caller is responsible for calling Initialize()
// before calling `Execute` on the returned command.
func (tcmd *TopLevelCommand) HandleGlobalFlags() (*cobra.Command, []string, error) {
cmd := tcmd.cmd
// We manually parse the global arguments and find the
// subcommand in order to properly deal with plugins. We rely
// on the root command never having any non-flag arguments. We
// create our own FlagSet so that we can configure it
// (e.g. `SetInterspersed` below) in an idempotent way.
flags := pflag.NewFlagSet(cmd.Name(), pflag.ContinueOnError)
// We need !interspersed to ensure we stop at the first
// potential command instead of accumulating it into
// flags.Args() and then continuing on and finding other
// arguments which we try and treat as globals (when they are
// actually arguments to the subcommand).
flags.SetInterspersed(false)
// We need the single parse to see both sets of flags.
flags.AddFlagSet(cmd.Flags())
flags.AddFlagSet(cmd.PersistentFlags())
// Now parse the global flags, up to (but not including) the
// first command. The result will be that all the remaining
// arguments are in `flags.Args()`.
if err := flags.Parse(tcmd.args); err != nil {
// Our FlagErrorFunc uses the cli, make sure it is initialized
if err := tcmd.Initialize(); err != nil {
return nil, nil, err
}
return nil, nil, cmd.FlagErrorFunc()(cmd, err)
}
return cmd, flags.Args(), nil
}
// Initialize finalises global option parsing and initializes the docker client.
func (tcmd *TopLevelCommand) Initialize(ops ...command.InitializeOpt) error {
tcmd.opts.Common.SetDefaultOptions(tcmd.flags)
return tcmd.dockerCli.Initialize(tcmd.opts, ops...)
}
// VisitAll will traverse all commands from the root.
// This is different from the VisitAll of cobra.Command where only parents
// are checked.
func VisitAll(root *cobra.Command, fn func(*cobra.Command)) {
for _, cmd := range root.Commands() {
VisitAll(cmd, fn)
}
fn(root)
}
// DisableFlagsInUseLine sets the DisableFlagsInUseLine flag on all
// commands within the tree rooted at cmd.
func DisableFlagsInUseLine(cmd *cobra.Command) {
VisitAll(cmd, func(ccmd *cobra.Command) {
// do not add a `[flags]` to the end of the usage line.
ccmd.DisableFlagsInUseLine = true
})
}
var helpCommand = &cobra.Command{
Use: "help [command]",
Short: "Help about the command",
PersistentPreRun: func(cmd *cobra.Command, args []string) {},
PersistentPostRun: func(cmd *cobra.Command, args []string) {},
RunE: func(c *cobra.Command, args []string) error {
cmd, args, e := c.Root().Find(args)
if cmd == nil || e != nil || len(args) > 0 {
return errors.Errorf("unknown help topic: %v", strings.Join(args, " "))
}
helpFunc := cmd.HelpFunc()
helpFunc(cmd, args)
return nil
},
}
func isExperimental(cmd *cobra.Command) bool {
if _, ok := cmd.Annotations["experimentalCLI"]; ok {
return true
}
var experimental bool
cmd.VisitParents(func(cmd *cobra.Command) {
if _, ok := cmd.Annotations["experimentalCLI"]; ok {
experimental = true
}
})
return experimental
}
func additionalHelp(cmd *cobra.Command) string {
if additionalHelp, ok := cmd.Annotations["additionalHelp"]; ok {
style := aec.EmptyBuilder.Bold().ANSI
return style.Apply(additionalHelp)
}
return ""
}
func hasAdditionalHelp(cmd *cobra.Command) bool {
return additionalHelp(cmd) != ""
}
func isPlugin(cmd *cobra.Command) bool {
return cmd.Annotations[pluginmanager.CommandAnnotationPlugin] == "true"
}
func hasSubCommands(cmd *cobra.Command) bool {
return len(operationSubCommands(cmd)) > 0
}
func hasManagementSubCommands(cmd *cobra.Command) bool {
return len(managementSubCommands(cmd)) > 0
}
func hasInvalidPlugins(cmd *cobra.Command) bool {
return len(invalidPlugins(cmd)) > 0
}
func operationSubCommands(cmd *cobra.Command) []*cobra.Command {
cmds := []*cobra.Command{}
for _, sub := range cmd.Commands() {
if isPlugin(sub) {
continue
}
if sub.IsAvailableCommand() && !sub.HasSubCommands() {
cmds = append(cmds, sub)
}
}
return cmds
}
func wrappedFlagUsages(cmd *cobra.Command) string {
width := 80
if ws, err := term.GetWinsize(0); err == nil {
width = int(ws.Width)
}
return cmd.Flags().FlagUsagesWrapped(width - 1)
}
func decoratedName(cmd *cobra.Command) string {
decoration := " "
if isPlugin(cmd) {
decoration = "*"
}
return cmd.Name() + decoration
}
func vendorAndVersion(cmd *cobra.Command) string {
if vendor, ok := cmd.Annotations[pluginmanager.CommandAnnotationPluginVendor]; ok && isPlugin(cmd) {
version := ""
if v, ok := cmd.Annotations[pluginmanager.CommandAnnotationPluginVersion]; ok && v != "" {
version = ", " + v
}
return fmt.Sprintf("(%s%s)", vendor, version)
}
return ""
}
func managementSubCommands(cmd *cobra.Command) []*cobra.Command {
cmds := []*cobra.Command{}
for _, sub := range cmd.Commands() {
if isPlugin(sub) {
if invalidPluginReason(sub) == "" {
cmds = append(cmds, sub)
}
continue
}
if sub.IsAvailableCommand() && sub.HasSubCommands() {
cmds = append(cmds, sub)
}
}
return cmds
}
func invalidPlugins(cmd *cobra.Command) []*cobra.Command {
cmds := []*cobra.Command{}
for _, sub := range cmd.Commands() {
if !isPlugin(sub) {
continue
}
if invalidPluginReason(sub) != "" {
cmds = append(cmds, sub)
}
}
return cmds
}
func invalidPluginReason(cmd *cobra.Command) string {
return cmd.Annotations[pluginmanager.CommandAnnotationPluginInvalid]
}
var usageTemplate = `Usage:
{{- if not .HasSubCommands}} {{.UseLine}}{{end}}
{{- if .HasSubCommands}} {{ .CommandPath}}{{- if .HasAvailableFlags}} [OPTIONS]{{end}} COMMAND{{end}}
{{if ne .Long ""}}{{ .Long | trim }}{{ else }}{{ .Short | trim }}{{end}}
{{- if isExperimental .}}
EXPERIMENTAL:
{{.CommandPath}} is an experimental feature.
Experimental features provide early access to product functionality. These
features may change between releases without warning, or can be removed from a
future release. Learn more about experimental features in our documentation:
https://docs.docker.com/go/experimental/
{{- end}}
{{- if gt .Aliases 0}}
Aliases:
{{.NameAndAliases}}
{{- end}}
{{- if .HasExample}}
Examples:
{{ .Example }}
{{- end}}
{{- if .HasAvailableFlags}}
Options:
{{ wrappedFlagUsages . | trimRightSpace}}
{{- end}}
{{- if hasManagementSubCommands . }}
Management Commands:
{{- range managementSubCommands . }}
{{rpad (decoratedName .) (add .NamePadding 1)}}{{.Short}}{{ if isPlugin .}} {{vendorAndVersion .}}{{ end}}
{{- end}}
{{- end}}
{{- if hasSubCommands .}}
Commands:
{{- range operationSubCommands . }}
{{rpad .Name .NamePadding }} {{.Short}}
{{- end}}
{{- end}}
{{- if hasInvalidPlugins . }}
Invalid Plugins:
{{- range invalidPlugins . }}
{{rpad .Name .NamePadding }} {{invalidPluginReason .}}
{{- end}}
{{- end}}
{{- if .HasSubCommands }}
Run '{{.CommandPath}} COMMAND --help' for more information on a command.
{{- end}}
{{- if hasAdditionalHelp .}}
{{ additionalHelp . }}
{{- end}}
`
var helpTemplate = `
{{if or .Runnable .HasSubCommands}}{{.UsageString}}{{end}}`