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run.go
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run.go
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package container
import (
"fmt"
"io"
"net/http/httputil"
"os"
"runtime"
"strings"
"syscall"
"github.com/Sirupsen/logrus"
"github.com/docker/docker/api/types"
"github.com/docker/docker/api/types/container"
"github.com/docker/docker/cli"
"github.com/docker/docker/cli/command"
"github.com/docker/docker/pkg/promise"
"github.com/docker/docker/pkg/signal"
"github.com/docker/libnetwork/resolvconf/dns"
"github.com/pkg/errors"
"github.com/spf13/cobra"
"github.com/spf13/pflag"
"golang.org/x/net/context"
)
type runOptions struct {
detach bool
sigProxy bool
name string
detachKeys string
}
// NewRunCommand create a new `docker run` command
func NewRunCommand(dockerCli *command.DockerCli) *cobra.Command {
var opts runOptions
var copts *containerOptions
cmd := &cobra.Command{
Use: "run [OPTIONS] IMAGE [COMMAND] [ARG...]",
Short: "Run a command in a new container",
Args: cli.RequiresMinArgs(1),
RunE: func(cmd *cobra.Command, args []string) error {
copts.Image = args[0]
if len(args) > 1 {
copts.Args = args[1:]
}
return runRun(dockerCli, cmd.Flags(), &opts, copts)
},
}
flags := cmd.Flags()
flags.SetInterspersed(false)
// These are flags not stored in Config/HostConfig
flags.BoolVarP(&opts.detach, "detach", "d", false, "Run container in background and print container ID")
flags.BoolVar(&opts.sigProxy, "sig-proxy", true, "Proxy received signals to the process")
flags.StringVar(&opts.name, "name", "", "Assign a name to the container")
flags.StringVar(&opts.detachKeys, "detach-keys", "", "Override the key sequence for detaching a container")
// Add an explicit help that doesn't have a `-h` to prevent the conflict
// with hostname
flags.Bool("help", false, "Print usage")
command.AddTrustVerificationFlags(flags)
copts = addFlags(flags)
return cmd
}
func warnOnOomKillDisable(hostConfig container.HostConfig, stderr io.Writer) {
if hostConfig.OomKillDisable != nil && *hostConfig.OomKillDisable && hostConfig.Memory == 0 {
fmt.Fprintln(stderr, "WARNING: Disabling the OOM killer on containers without setting a '-m/--memory' limit may be dangerous.")
}
}
// check the DNS settings passed via --dns against localhost regexp to warn if
// they are trying to set a DNS to a localhost address
func warnOnLocalhostDNS(hostConfig container.HostConfig, stderr io.Writer) {
for _, dnsIP := range hostConfig.DNS {
if dns.IsLocalhost(dnsIP) {
fmt.Fprintf(stderr, "WARNING: Localhost DNS setting (--dns=%s) may fail in containers.\n", dnsIP)
return
}
}
}
func runRun(dockerCli *command.DockerCli, flags *pflag.FlagSet, opts *runOptions, copts *containerOptions) error {
containerConfig, err := parse(flags, copts)
// just in case the parse does not exit
if err != nil {
reportError(dockerCli.Err(), "run", err.Error(), true)
return cli.StatusError{StatusCode: 125}
}
return runContainer(dockerCli, opts, copts, containerConfig)
}
func runContainer(dockerCli *command.DockerCli, opts *runOptions, copts *containerOptions, containerConfig *containerConfig) error {
config := containerConfig.Config
hostConfig := containerConfig.HostConfig
stdout, stderr := dockerCli.Out(), dockerCli.Err()
client := dockerCli.Client()
// TODO: pass this as an argument
cmdPath := "run"
warnOnOomKillDisable(*hostConfig, stderr)
warnOnLocalhostDNS(*hostConfig, stderr)
config.ArgsEscaped = false
if !opts.detach {
if err := dockerCli.In().CheckTty(config.AttachStdin, config.Tty); err != nil {
return err
}
} else {
if copts.attach.Len() != 0 {
return errors.New("Conflicting options: -a and -d")
}
config.AttachStdin = false
config.AttachStdout = false
config.AttachStderr = false
config.StdinOnce = false
}
// Disable sigProxy when in TTY mode
if config.Tty {
opts.sigProxy = false
}
// Telling the Windows daemon the initial size of the tty during start makes
// a far better user experience rather than relying on subsequent resizes
// to cause things to catch up.
if runtime.GOOS == "windows" {
hostConfig.ConsoleSize[0], hostConfig.ConsoleSize[1] = dockerCli.Out().GetTtySize()
}
ctx, cancelFun := context.WithCancel(context.Background())
createResponse, err := createContainer(ctx, dockerCli, containerConfig, opts.name)
if err != nil {
reportError(stderr, cmdPath, err.Error(), true)
return runStartContainerErr(err)
}
if opts.sigProxy {
sigc := ForwardAllSignals(ctx, dockerCli, createResponse.ID)
defer signal.StopCatch(sigc)
}
var (
waitDisplayID chan struct{}
errCh chan error
)
if !config.AttachStdout && !config.AttachStderr {
// Make this asynchronous to allow the client to write to stdin before having to read the ID
waitDisplayID = make(chan struct{})
go func() {
defer close(waitDisplayID)
fmt.Fprintln(stdout, createResponse.ID)
}()
}
attach := config.AttachStdin || config.AttachStdout || config.AttachStderr
if attach {
if opts.detachKeys != "" {
dockerCli.ConfigFile().DetachKeys = opts.detachKeys
}
close, err := attachContainer(ctx, dockerCli, &errCh, config, createResponse.ID)
defer close()
if err != nil {
return err
}
}
statusChan := waitExitOrRemoved(ctx, dockerCli, createResponse.ID, copts.autoRemove)
//start the container
if err := client.ContainerStart(ctx, createResponse.ID, types.ContainerStartOptions{}); err != nil {
// If we have holdHijackedConnection, we should notify
// holdHijackedConnection we are going to exit and wait
// to avoid the terminal are not restored.
if attach {
cancelFun()
<-errCh
}
reportError(stderr, cmdPath, err.Error(), false)
if copts.autoRemove {
// wait container to be removed
<-statusChan
}
return runStartContainerErr(err)
}
if (config.AttachStdin || config.AttachStdout || config.AttachStderr) && config.Tty && dockerCli.Out().IsTerminal() {
if err := MonitorTtySize(ctx, dockerCli, createResponse.ID, false); err != nil {
fmt.Fprintln(stderr, "Error monitoring TTY size:", err)
}
}
if errCh != nil {
if err := <-errCh; err != nil {
logrus.Debugf("Error hijack: %s", err)
return err
}
}
// Detached mode: wait for the id to be displayed and return.
if !config.AttachStdout && !config.AttachStderr {
// Detached mode
<-waitDisplayID
return nil
}
status := <-statusChan
if status != 0 {
return cli.StatusError{StatusCode: status}
}
return nil
}
func attachContainer(
ctx context.Context,
dockerCli *command.DockerCli,
errCh *chan error,
config *container.Config,
containerID string,
) (func(), error) {
stdout, stderr := dockerCli.Out(), dockerCli.Err()
var (
out, cerr io.Writer
in io.ReadCloser
)
if config.AttachStdin {
in = dockerCli.In()
}
if config.AttachStdout {
out = stdout
}
if config.AttachStderr {
if config.Tty {
cerr = stdout
} else {
cerr = stderr
}
}
options := types.ContainerAttachOptions{
Stream: true,
Stdin: config.AttachStdin,
Stdout: config.AttachStdout,
Stderr: config.AttachStderr,
DetachKeys: dockerCli.ConfigFile().DetachKeys,
}
resp, errAttach := dockerCli.Client().ContainerAttach(ctx, containerID, options)
if errAttach != nil && errAttach != httputil.ErrPersistEOF {
// ContainerAttach returns an ErrPersistEOF (connection closed)
// means server met an error and put it in Hijacked connection
// keep the error and read detailed error message from hijacked connection later
return nil, errAttach
}
*errCh = promise.Go(func() error {
if errHijack := holdHijackedConnection(ctx, dockerCli, config.Tty, in, out, cerr, resp); errHijack != nil {
return errHijack
}
return errAttach
})
return resp.Close, nil
}
// reportError is a utility method that prints a user-friendly message
// containing the error that occurred during parsing and a suggestion to get help
func reportError(stderr io.Writer, name string, str string, withHelp bool) {
str = strings.TrimSuffix(str, ".") + "."
if withHelp {
str += "\nSee '" + os.Args[0] + " " + name + " --help'."
}
fmt.Fprintf(stderr, "%s: %s\n", os.Args[0], str)
}
// if container start fails with 'not found'/'no such' error, return 127
// if container start fails with 'permission denied' error, return 126
// return 125 for generic docker daemon failures
func runStartContainerErr(err error) error {
trimmedErr := strings.TrimPrefix(err.Error(), "Error response from daemon: ")
statusError := cli.StatusError{StatusCode: 125}
if strings.Contains(trimmedErr, "executable file not found") ||
strings.Contains(trimmedErr, "no such file or directory") ||
strings.Contains(trimmedErr, "system cannot find the file specified") {
statusError = cli.StatusError{StatusCode: 127}
} else if strings.Contains(trimmedErr, syscall.EACCES.Error()) {
statusError = cli.StatusError{StatusCode: 126}
}
return statusError
}