mirror of https://github.com/docker/cli.git
438 lines
13 KiB
Go
438 lines
13 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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"os/exec"
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"strings"
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"syscall"
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"github.com/docker/cli/cli"
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pluginmanager "github.com/docker/cli/cli-plugins/manager"
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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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cliflags "github.com/docker/cli/cli/flags"
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"github.com/docker/cli/cli/version"
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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/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) *cli.TopLevelCommand {
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var (
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opts *cliflags.ClientOptions
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flags *pflag.FlagSet
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helpCmd *cobra.Command
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)
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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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RunE: func(cmd *cobra.Command, args []string) error {
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if len(args) == 0 {
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return command.ShowHelp(dockerCli.Err())(cmd, args)
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}
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return fmt.Errorf("docker: '%s' is not a docker command.\nSee 'docker --help'", args[0])
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},
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PersistentPreRunE: func(cmd *cobra.Command, args []string) error {
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return isSupported(cmd, dockerCli)
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},
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Version: fmt.Sprintf("%s, build %s", version.Version, version.GitCommit),
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DisableFlagsInUseLine: true,
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}
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opts, flags, helpCmd = cli.SetupRootCommand(cmd)
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flags.BoolP("version", "v", false, "Print version information and quit")
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setFlagErrorFunc(dockerCli, cmd)
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setupHelpCommand(dockerCli, cmd, helpCmd)
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setHelpFunc(dockerCli, cmd)
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cmd.SetOutput(dockerCli.Out())
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commands.AddCommands(cmd, dockerCli)
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cli.DisableFlagsInUseLine(cmd)
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setValidateArgs(dockerCli, cmd)
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// flags must be the top-level command flags, not cmd.Flags()
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return cli.NewTopLevelCommand(cmd, dockerCli, opts, flags)
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}
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func setFlagErrorFunc(dockerCli *command.DockerCli, cmd *cobra.Command) {
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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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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 setupHelpCommand(dockerCli command.Cli, rootCmd, helpCmd *cobra.Command) {
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origRun := helpCmd.Run
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origRunE := helpCmd.RunE
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helpCmd.Run = nil
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helpCmd.RunE = func(c *cobra.Command, args []string) error {
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if len(args) > 0 {
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helpcmd, err := pluginmanager.PluginRunCommand(dockerCli, args[0], rootCmd)
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if err == nil {
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err = helpcmd.Run()
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if err != nil {
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return err
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}
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}
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if !pluginmanager.IsNotFound(err) {
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return err
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}
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}
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if origRunE != nil {
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return origRunE(c, args)
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}
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origRun(c, args)
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return nil
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}
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}
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func tryRunPluginHelp(dockerCli command.Cli, ccmd *cobra.Command, cargs []string) error {
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root := ccmd.Root()
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cmd, _, err := root.Traverse(cargs)
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if err != nil {
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return err
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}
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helpcmd, err := pluginmanager.PluginRunCommand(dockerCli, cmd.Name(), root)
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if err != nil {
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return err
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}
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return helpcmd.Run()
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}
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func setHelpFunc(dockerCli command.Cli, cmd *cobra.Command) {
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defaultHelpFunc := cmd.HelpFunc()
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cmd.SetHelpFunc(func(ccmd *cobra.Command, args []string) {
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// Add a stub entry for every plugin so they are
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// included in the help output and so that
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// `tryRunPluginHelp` can find them or if we fall
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// through they will be included in the default help
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// output.
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if err := pluginmanager.AddPluginCommandStubs(dockerCli, ccmd.Root()); err != nil {
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ccmd.Println(err)
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return
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}
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if len(args) >= 1 {
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err := tryRunPluginHelp(dockerCli, ccmd, args)
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if err == nil { // Successfully ran the plugin
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return
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}
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if !pluginmanager.IsNotFound(err) {
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ccmd.Println(err)
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return
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}
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}
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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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if err := hideUnsupportedFeatures(ccmd, dockerCli); err != nil {
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ccmd.Println(err)
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return
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}
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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) {
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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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cli.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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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 tryPluginRun(dockerCli command.Cli, cmd *cobra.Command, subcommand string) error {
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plugincmd, err := pluginmanager.PluginRunCommand(dockerCli, subcommand, cmd)
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if err != nil {
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return err
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}
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if err := plugincmd.Run(); err != nil {
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statusCode := 1
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exitErr, ok := err.(*exec.ExitError)
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if !ok {
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return err
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}
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if ws, ok := exitErr.Sys().(syscall.WaitStatus); ok {
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statusCode = ws.ExitStatus()
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}
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return cli.StatusError{
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StatusCode: statusCode,
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}
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}
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return nil
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}
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func runDocker(dockerCli *command.DockerCli) error {
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tcmd := newDockerCommand(dockerCli)
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cmd, args, err := tcmd.HandleGlobalFlags()
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if err != nil {
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return err
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}
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if err := tcmd.Initialize(); err != nil {
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return err
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}
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if len(args) > 0 {
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if _, _, err := cmd.Find(args); err != nil {
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err := tryPluginRun(dockerCli, cmd, args[0])
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if !pluginmanager.IsNotFound(err) {
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return err
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}
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// For plugin not found we fall through to
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// cmd.Execute() which deals with reporting
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// "command not found" in a consistent way.
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}
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}
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// We've parsed global args already, so reset args to those
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// which remain.
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cmd.SetArgs(args)
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return cmd.Execute()
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}
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func main() {
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dockerCli, err := command.NewDockerCli()
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if err != nil {
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fmt.Fprintln(os.Stderr, err)
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os.Exit(1)
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}
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logrus.SetOutput(dockerCli.Err())
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if err := runDocker(dockerCli); 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(dockerCli.Err(), 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(dockerCli.Err(), err)
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os.Exit(1)
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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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ClientInfo() command.ClientInfo
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ServerInfo() command.ServerInfo
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}
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func hideFeatureFlag(f *pflag.Flag, hasFeature bool, annotation string) {
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if hasFeature {
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return
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}
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if _, ok := f.Annotations[annotation]; ok {
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f.Hidden = true
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}
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}
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func hideFeatureSubCommand(subcmd *cobra.Command, hasFeature bool, annotation string) {
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if hasFeature {
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return
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}
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if _, ok := subcmd.Annotations[annotation]; ok {
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subcmd.Hidden = true
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}
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}
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func hideUnsupportedFeatures(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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hasExperimentalCLI := details.ClientInfo().HasExperimental
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hasBuildKit, err := command.BuildKitEnabled(details.ServerInfo())
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if err != nil {
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return err
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}
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cmd.Flags().VisitAll(func(f *pflag.Flag) {
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hideFeatureFlag(f, hasExperimental, "experimental")
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hideFeatureFlag(f, hasExperimentalCLI, "experimentalCLI")
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hideFeatureFlag(f, hasBuildKit, "buildkit")
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hideFeatureFlag(f, !hasBuildKit, "no-buildkit")
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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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// root command shows all top-level flags
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if cmd.Parent() != nil {
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if commands, ok := f.Annotations["top-level"]; ok {
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f.Hidden = !findCommand(cmd, commands)
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}
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}
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})
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for _, subcmd := range cmd.Commands() {
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hideFeatureSubCommand(subcmd, hasExperimental, "experimental")
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hideFeatureSubCommand(subcmd, hasExperimentalCLI, "experimentalCLI")
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hideFeatureSubCommand(subcmd, hasBuildKit, "buildkit")
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hideFeatureSubCommand(subcmd, !hasBuildKit, "no-buildkit")
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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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if v, ok := subcmd.Annotations["ostype"]; ok && v != osType {
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subcmd.Hidden = true
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}
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}
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return nil
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}
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// Checks if a command or one of its ancestors is in the list
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func findCommand(cmd *cobra.Command, commands []string) bool {
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if cmd == nil {
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return false
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}
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for _, c := range commands {
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if c == cmd.Name() {
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return true
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}
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}
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return findCommand(cmd.Parent(), commands)
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}
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func isSupported(cmd *cobra.Command, details versionDetails) error {
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if err := areSubcommandsSupported(cmd, details); err != nil {
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return err
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}
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return areFlagsSupported(cmd, details)
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}
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func areFlagsSupported(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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hasExperimentalCLI := details.ClientInfo().HasExperimental
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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\" is only supported on a Docker daemon running 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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if _, ok := f.Annotations["experimentalCLI"]; ok && !hasExperimentalCLI {
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errs = append(errs, fmt.Sprintf("\"--%s\" is only supported on a Docker cli with experimental cli features enabled", f.Name))
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}
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// buildkit-specific flags are noop when buildkit is not enabled, so we do not add an error in that case
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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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// Check recursively so that, e.g., `docker stack ls` returns the same output as `docker stack`
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func areSubcommandsSupported(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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hasExperimentalCLI := details.ClientInfo().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 os, ok := curr.Annotations["ostype"]; ok && os != osType {
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return fmt.Errorf("%s is only supported on a Docker daemon running on %s, but the Docker daemon is running on %s", cmd.CommandPath(), os, osType)
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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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if _, ok := curr.Annotations["experimentalCLI"]; ok && !hasExperimentalCLI {
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return fmt.Errorf("%s is only supported on a Docker cli with experimental cli features enabled", cmd.CommandPath())
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}
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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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