308 lines
9.1 KiB
Go
308 lines
9.1 KiB
Go
package main
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import (
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"errors"
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"fmt"
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"os"
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"strings"
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"github.com/docker/cli/cli"
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"github.com/docker/cli/cli/command"
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"github.com/docker/cli/cli/command/commands"
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cliconfig "github.com/docker/cli/cli/config"
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"github.com/docker/cli/cli/debug"
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cliflags "github.com/docker/cli/cli/flags"
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"github.com/docker/docker/api/types/versions"
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"github.com/docker/docker/client"
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"github.com/docker/docker/pkg/term"
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"github.com/sirupsen/logrus"
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"github.com/spf13/cobra"
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"github.com/spf13/pflag"
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)
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func newDockerCommand(dockerCli *command.DockerCli) *cobra.Command {
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opts := cliflags.NewClientOptions()
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var flags *pflag.FlagSet
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cmd := &cobra.Command{
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Use: "docker [OPTIONS] COMMAND [ARG...]",
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Short: "A self-sufficient runtime for containers",
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SilenceUsage: true,
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SilenceErrors: true,
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TraverseChildren: true,
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Args: noArgs,
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RunE: func(cmd *cobra.Command, args []string) error {
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if opts.Version {
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showVersion()
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return nil
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}
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return command.ShowHelp(dockerCli.Err())(cmd, args)
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},
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PersistentPreRunE: func(cmd *cobra.Command, args []string) error {
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// daemon command is special, we redirect directly to another binary
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if cmd.Name() == "daemon" {
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return nil
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}
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// flags must be the top-level command flags, not cmd.Flags()
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opts.Common.SetDefaultOptions(flags)
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dockerPreRun(opts)
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if err := dockerCli.Initialize(opts); err != nil {
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return err
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}
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return isSupported(cmd, dockerCli)
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},
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}
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cli.SetupRootCommand(cmd)
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flags = cmd.Flags()
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flags.BoolVarP(&opts.Version, "version", "v", false, "Print version information and quit")
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flags.StringVar(&opts.ConfigDir, "config", cliconfig.Dir(), "Location of client config files")
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opts.Common.InstallFlags(flags)
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setFlagErrorFunc(dockerCli, cmd, flags, opts)
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setHelpFunc(dockerCli, cmd, flags, opts)
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cmd.SetOutput(dockerCli.Out())
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cmd.AddCommand(newDaemonCommand())
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commands.AddCommands(cmd, dockerCli)
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setValidateArgs(dockerCli, cmd, flags, opts)
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return cmd
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}
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func setFlagErrorFunc(dockerCli *command.DockerCli, cmd *cobra.Command, flags *pflag.FlagSet, opts *cliflags.ClientOptions) {
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// When invoking `docker stack --nonsense`, we need to make sure FlagErrorFunc return appropriate
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// output if the feature is not supported.
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// As above cli.SetupRootCommand(cmd) have already setup the FlagErrorFunc, we will add a pre-check before the FlagErrorFunc
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// is called.
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flagErrorFunc := cmd.FlagErrorFunc()
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cmd.SetFlagErrorFunc(func(cmd *cobra.Command, err error) error {
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initializeDockerCli(dockerCli, flags, opts)
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if err := isSupported(cmd, dockerCli); err != nil {
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return err
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}
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return flagErrorFunc(cmd, err)
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})
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}
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func setHelpFunc(dockerCli *command.DockerCli, cmd *cobra.Command, flags *pflag.FlagSet, opts *cliflags.ClientOptions) {
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defaultHelpFunc := cmd.HelpFunc()
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cmd.SetHelpFunc(func(ccmd *cobra.Command, args []string) {
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initializeDockerCli(dockerCli, flags, opts)
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if err := isSupported(ccmd, dockerCli); err != nil {
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ccmd.Println(err)
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return
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}
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hideUnsupportedFeatures(ccmd, dockerCli)
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defaultHelpFunc(ccmd, args)
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})
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}
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func setValidateArgs(dockerCli *command.DockerCli, cmd *cobra.Command, flags *pflag.FlagSet, opts *cliflags.ClientOptions) {
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// The Args is handled by ValidateArgs in cobra, which does not allows a pre-hook.
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// As a result, here we replace the existing Args validation func to a wrapper,
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// where the wrapper will check to see if the feature is supported or not.
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// The Args validation error will only be returned if the feature is supported.
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visitAll(cmd, func(ccmd *cobra.Command) {
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// if there is no tags for a command or any of its parent,
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// there is no need to wrap the Args validation.
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if !hasTags(ccmd) {
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return
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}
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if ccmd.Args == nil {
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return
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}
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cmdArgs := ccmd.Args
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ccmd.Args = func(cmd *cobra.Command, args []string) error {
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initializeDockerCli(dockerCli, flags, opts)
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if err := isSupported(cmd, dockerCli); err != nil {
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return err
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}
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return cmdArgs(cmd, args)
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}
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})
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}
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func initializeDockerCli(dockerCli *command.DockerCli, flags *pflag.FlagSet, opts *cliflags.ClientOptions) {
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if dockerCli.Client() == nil { // when using --help, PersistentPreRun is not called, so initialization is needed.
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// flags must be the top-level command flags, not cmd.Flags()
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opts.Common.SetDefaultOptions(flags)
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dockerPreRun(opts)
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dockerCli.Initialize(opts)
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}
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}
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// visitAll will traverse all commands from the root.
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// This is different from the VisitAll of cobra.Command where only parents
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// are checked.
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func visitAll(root *cobra.Command, fn func(*cobra.Command)) {
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for _, cmd := range root.Commands() {
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visitAll(cmd, fn)
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}
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fn(root)
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}
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func noArgs(cmd *cobra.Command, args []string) error {
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if len(args) == 0 {
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return nil
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}
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return fmt.Errorf(
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"docker: '%s' is not a docker command.\nSee 'docker --help'", args[0])
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}
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func main() {
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// Set terminal emulation based on platform as required.
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stdin, stdout, stderr := term.StdStreams()
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logrus.SetOutput(stderr)
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dockerCli := command.NewDockerCli(stdin, stdout, stderr)
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cmd := newDockerCommand(dockerCli)
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if err := cmd.Execute(); err != nil {
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if sterr, ok := err.(cli.StatusError); ok {
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if sterr.Status != "" {
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fmt.Fprintln(stderr, sterr.Status)
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}
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// StatusError should only be used for errors, and all errors should
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// have a non-zero exit status, so never exit with 0
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if sterr.StatusCode == 0 {
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os.Exit(1)
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}
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os.Exit(sterr.StatusCode)
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}
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fmt.Fprintln(stderr, err)
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os.Exit(1)
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}
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}
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func showVersion() {
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fmt.Printf("Docker version %s, build %s\n", cli.Version, cli.GitCommit)
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}
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func dockerPreRun(opts *cliflags.ClientOptions) {
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cliflags.SetLogLevel(opts.Common.LogLevel)
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if opts.ConfigDir != "" {
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cliconfig.SetDir(opts.ConfigDir)
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}
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if opts.Common.Debug {
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debug.Enable()
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}
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}
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type versionDetails interface {
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Client() client.APIClient
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ServerInfo() command.ServerInfo
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}
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func hideUnsupportedFeatures(cmd *cobra.Command, details versionDetails) {
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clientVersion := details.Client().ClientVersion()
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osType := details.ServerInfo().OSType
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hasExperimental := details.ServerInfo().HasExperimental
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cmd.Flags().VisitAll(func(f *pflag.Flag) {
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// hide experimental flags
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if !hasExperimental {
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if _, ok := f.Annotations["experimental"]; ok {
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f.Hidden = true
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}
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}
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// hide flags not supported by the server
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if !isOSTypeSupported(f, osType) || !isVersionSupported(f, clientVersion) {
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f.Hidden = true
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}
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})
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for _, subcmd := range cmd.Commands() {
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// hide experimental subcommands
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if !hasExperimental {
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if _, ok := subcmd.Annotations["experimental"]; ok {
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subcmd.Hidden = true
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}
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}
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// hide subcommands not supported by the server
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if subcmdVersion, ok := subcmd.Annotations["version"]; ok && versions.LessThan(clientVersion, subcmdVersion) {
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subcmd.Hidden = true
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}
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}
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}
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func isSupported(cmd *cobra.Command, details versionDetails) error {
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clientVersion := details.Client().ClientVersion()
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osType := details.ServerInfo().OSType
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hasExperimental := details.ServerInfo().HasExperimental
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// Check recursively so that, e.g., `docker stack ls` returns the same output as `docker stack`
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for curr := cmd; curr != nil; curr = curr.Parent() {
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if cmdVersion, ok := curr.Annotations["version"]; ok && versions.LessThan(clientVersion, cmdVersion) {
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return fmt.Errorf("%s requires API version %s, but the Docker daemon API version is %s", cmd.CommandPath(), cmdVersion, clientVersion)
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}
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if _, ok := curr.Annotations["experimental"]; ok && !hasExperimental {
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return fmt.Errorf("%s is only supported on a Docker daemon with experimental features enabled", cmd.CommandPath())
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}
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}
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errs := []string{}
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cmd.Flags().VisitAll(func(f *pflag.Flag) {
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if f.Changed {
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if !isVersionSupported(f, clientVersion) {
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errs = append(errs, fmt.Sprintf("\"--%s\" requires API version %s, but the Docker daemon API version is %s", f.Name, getFlagAnnotation(f, "version"), clientVersion))
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return
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}
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if !isOSTypeSupported(f, osType) {
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errs = append(errs, fmt.Sprintf("\"--%s\" requires the Docker daemon to run on %s, but the Docker daemon is running on %s", f.Name, getFlagAnnotation(f, "ostype"), osType))
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return
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}
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if _, ok := f.Annotations["experimental"]; ok && !hasExperimental {
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errs = append(errs, fmt.Sprintf("\"--%s\" is only supported on a Docker daemon with experimental features enabled", f.Name))
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}
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}
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})
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if len(errs) > 0 {
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return errors.New(strings.Join(errs, "\n"))
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}
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return nil
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}
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func getFlagAnnotation(f *pflag.Flag, annotation string) string {
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if value, ok := f.Annotations[annotation]; ok && len(value) == 1 {
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return value[0]
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}
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return ""
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}
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func isVersionSupported(f *pflag.Flag, clientVersion string) bool {
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if v := getFlagAnnotation(f, "version"); v != "" {
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return versions.GreaterThanOrEqualTo(clientVersion, v)
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}
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return true
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}
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func isOSTypeSupported(f *pflag.Flag, osType string) bool {
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if v := getFlagAnnotation(f, "ostype"); v != "" && osType != "" {
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return osType == v
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}
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return true
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}
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// hasTags return true if any of the command's parents has tags
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func hasTags(cmd *cobra.Command) bool {
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for curr := cmd; curr != nil; curr = curr.Parent() {
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if len(curr.Annotations) > 0 {
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return true
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}
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}
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return false
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}
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