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Convert docker root command to use pflag and cobra 

Fix the daemon proxy for cobra commands.

Signed-off-by: Daniel Nephin <dnephin@docker.com>
This commit is contained in:
Daniel Nephin 2016-06-22 13:08:04 -04:00
parent 23dd85befd
commit 08784d7e0e
5 changed files with 103 additions and 99 deletions
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18
daemon.go
View File

@ -1,18 +0,0 @@
package main
const daemonBinary = "dockerd"
// DaemonProxy acts as a cli.Handler to proxy calls to the daemon binary
type DaemonProxy struct{}
// NewDaemonProxy returns a new handler
func NewDaemonProxy() DaemonProxy {
return DaemonProxy{}
}
// Command returns a cli command handler if one exists
func (p DaemonProxy) Command(name string) func(...string) error {
return map[string]func(...string) error{
"daemon": p.CmdDaemon,
}[name]
}

14
daemon_none.go
View File

@ -4,12 +4,22 @@ package main
import (
"fmt"
"github.com/spf13/cobra"
"runtime"
"strings"
)
// CmdDaemon reports on an error on windows, because there is no exec
func (p DaemonProxy) CmdDaemon(args ...string) error {
func newDaemonCommand() *cobra.Command {
return &cobra.Command{
Use: "daemon",
Hidden: true,
RunE: func(cmd *cobra.Command, args []string) error {
return runDaemon()
},
}
}
func runDaemon() error {
return fmt.Errorf(
"`docker daemon` is not supported on %s. Please run `dockerd` directly",
strings.Title(runtime.GOOS))

40
daemon_unix.go
View File

@ -3,23 +3,37 @@
package main
import (
"fmt"
"os"
"os/exec"
"path/filepath"
"syscall"
"github.com/spf13/cobra"
)
// CmdDaemon execs dockerd with the same flags
func (p DaemonProxy) CmdDaemon(args ...string) error {
// Special case for handling `docker help daemon`. When pkg/mflag is removed
// we can support this on the daemon side, but that is not possible with
// pkg/mflag because it uses os.Exit(1) instead of returning an error on
// unexpected args.
if len(args) == 0 || args[0] != "--help" {
// Use os.Args[1:] so that "global" args are passed to dockerd
args = stripDaemonArg(os.Args[1:])
}
const daemonBinary = "dockerd"
func newDaemonCommand() *cobra.Command {
cmd := &cobra.Command{
Use: "daemon",
Hidden: true,
RunE: func(cmd *cobra.Command, args []string) error {
return runDaemon()
},
}
cmd.SetHelpFunc(helpFunc)
return cmd
}
// CmdDaemon execs dockerd with the same flags
func runDaemon() error {
// Use os.Args[1:] so that "global" args are passed to dockerd
return execDaemon(stripDaemonArg(os.Args[1:]))
}
func execDaemon(args []string) error {
binaryPath, err := findDaemonBinary()
if err != nil {
return err
@ -31,6 +45,12 @@ func (p DaemonProxy) CmdDaemon(args ...string) error {
os.Environ())
}
func helpFunc(cmd *cobra.Command, args []string) {
if err := execDaemon([]string{"--help"}); err != nil {
fmt.Fprintf(os.Stderr, "%s\n", err.Error())
}
}
// findDaemonBinary looks for the path to the dockerd binary starting with
// the directory of the current executable (if one exists) and followed by $PATH
func findDaemonBinary() (string, error) {

118
docker.go
View File

@ -12,64 +12,52 @@ import (
cliflags "github.com/docker/docker/cli/flags"
"github.com/docker/docker/cliconfig"
"github.com/docker/docker/dockerversion"
flag "github.com/docker/docker/pkg/mflag"
"github.com/docker/docker/pkg/term"
"github.com/docker/docker/utils"
"github.com/spf13/cobra"
"github.com/spf13/pflag"
)
var (
commonFlags = cliflags.InitCommonFlags()
clientFlags = initClientFlags(commonFlags)
flHelp = flag.Bool([]string{"h", "-help"}, false, "Print usage")
flVersion = flag.Bool([]string{"v", "-version"}, false, "Print version information and quit")
)
func newDockerCommand(dockerCli *client.DockerCli, opts *cliflags.ClientOptions) *cobra.Command {
cmd := &cobra.Command{
Use: "docker [OPTIONS] COMMAND [arg...]",
Short: "A self-sufficient runtime for containers.",
SilenceUsage: true,
SilenceErrors: true,
Args: cli.NoArgs,
RunE: func(cmd *cobra.Command, args []string) error {
if opts.Version {
showVersion()
return nil
}
fmt.Fprintf(dockerCli.Err(), "\n"+cmd.UsageString())
return nil
},
PersistentPreRunE: func(cmd *cobra.Command, args []string) error {
dockerPreRun(cmd.Flags(), opts)
return dockerCli.Initialize(opts)
},
}
cobraadaptor.SetupRootCommand(cmd, dockerCli)
flags := cmd.Flags()
flags.BoolVarP(&opts.Version, "version", "v", false, "Print version information and quit")
flags.StringVar(&opts.ConfigDir, "config", cliconfig.ConfigDir(), "Location of client config files")
opts.Common.InstallFlags(flags)
return cmd
}
func main() {
// Set terminal emulation based on platform as required.
stdin, stdout, stderr := term.StdStreams()
logrus.SetOutput(stderr)
flag.Merge(flag.CommandLine, clientFlags.FlagSet, commonFlags.FlagSet)
opts := cliflags.NewClientOptions()
dockerCli := client.NewDockerCli(stdin, stdout, stderr, opts)
cmd := newDockerCommand(dockerCli, opts)
cobraAdaptor := cobraadaptor.NewCobraAdaptor(clientFlags)
flag.Usage = func() {
fmt.Fprint(stdout, "Usage: docker [OPTIONS] COMMAND [arg...]\n docker [ --help | -v | --version ]\n\n")
fmt.Fprint(stdout, "A self-sufficient runtime for containers.\n\nOptions:\n")
flag.CommandLine.SetOutput(stdout)
flag.PrintDefaults()
help := "\nCommands:\n"
dockerCommands := append(cli.DockerCommandUsage, cobraAdaptor.Usage()...)
for _, cmd := range sortCommands(dockerCommands) {
help += fmt.Sprintf(" %-10.10s%s\n", cmd.Name, cmd.Description)
}
help += "\nRun 'docker COMMAND --help' for more information on a command."
fmt.Fprintf(stdout, "%s\n", help)
}
flag.Parse()
if *flVersion {
showVersion()
return
}
if *flHelp {
// if global flag --help is present, regardless of what other options and commands there are,
// just print the usage.
flag.Usage()
return
}
clientCli := client.NewDockerCli(stdin, stdout, stderr, clientFlags)
c := cli.New(clientCli, NewDaemonProxy(), cobraAdaptor)
if err := c.Run(flag.Args()...); err != nil {
if err := cmd.Execute(); err != nil {
if sterr, ok := err.(cli.StatusError); ok {
if sterr.Status != "" {
fmt.Fprintln(stderr, sterr.Status)
@ -94,26 +82,22 @@ func showVersion() {
}
}
func initClientFlags(commonFlags *cliflags.CommonFlags) *cliflags.ClientFlags {
clientFlags := &cliflags.ClientFlags{FlagSet: new(flag.FlagSet), Common: commonFlags}
client := clientFlags.FlagSet
client.StringVar(&clientFlags.ConfigDir, []string{"-config"}, cliconfig.ConfigDir(), "Location of client config files")
func dockerPreRun(flags *pflag.FlagSet, opts *cliflags.ClientOptions) {
opts.Common.SetDefaultOptions(flags)
cliflags.SetDaemonLogLevel(opts.Common.LogLevel)
clientFlags.PostParse = func() {
clientFlags.Common.PostParse()
cliflags.SetDaemonLogLevel(commonOpts.LogLevel)
if clientFlags.ConfigDir != "" {
cliconfig.SetConfigDir(clientFlags.ConfigDir)
}
if clientFlags.Common.TrustKey == "" {
clientFlags.Common.TrustKey = filepath.Join(cliconfig.ConfigDir(), cliflags.DefaultTrustKeyFile)
}
if clientFlags.Common.Debug {
utils.EnableDebug()
}
// TODO: remove this, set a default in New, and pass it in opts
if opts.ConfigDir != "" {
cliconfig.SetConfigDir(opts.ConfigDir)
}
if opts.Common.TrustKey == "" {
opts.Common.TrustKey = filepath.Join(
cliconfig.ConfigDir(),
cliflags.DefaultTrustKeyFile)
}
if opts.Common.Debug {
utils.EnableDebug()
}
return clientFlags
}

12
docker_test.go
View File

@ -6,13 +6,21 @@ import (
"github.com/Sirupsen/logrus"
"github.com/docker/docker/utils"
"github.com/docker/docker/api/client"
cliflags "github.com/docker/docker/cli/flags"
)
func TestClientDebugEnabled(t *testing.T) {
defer utils.DisableDebug()
clientFlags.Common.FlagSet.Parse([]string{"-D"})
clientFlags.PostParse()
opts := cliflags.NewClientOptions()
cmd := newDockerCommand(&client.DockerCli{}, opts)
opts.Common.Debug = true
if err := cmd.PersistentPreRunE(cmd, []string{}); err != nil {
t.Fatalf("Unexpected error: %s", err.Error())
}
if os.Getenv("DEBUG") != "1" {
t.Fatal("expected debug enabled, got false")