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package container // import "github.com/docker/docker/api/server/router/container"
import (
"context"
"fmt"
"io"
"net/http"
"strconv"
"github.com/containerd/log"
"github.com/docker/docker/api/server/httputils"
"github.com/docker/docker/api/types"
"github.com/docker/docker/api/types/container"
"github.com/docker/docker/api/types/versions"
"github.com/docker/docker/errdefs"
"github.com/docker/docker/pkg/stdcopy"
)
func (s *containerRouter) getExecByID(ctx context.Context, w http.ResponseWriter, r *http.Request, vars map[string]string) error {
eConfig, err := s.backend.ContainerExecInspect(vars["id"])
if err != nil {
return err
}
return httputils.WriteJSON(w, http.StatusOK, eConfig)
}
type execCommandError struct{}
func (execCommandError) Error() string {
return "No exec command specified"
}
func (execCommandError) InvalidParameter() {}
func (s *containerRouter) postContainerExecCreate(ctx context.Context, w http.ResponseWriter, r *http.Request, vars map[string]string) error {
if err := httputils.ParseForm(r); err != nil {
return err
}
execConfig := &types.ExecConfig{}
if err := httputils.ReadJSON(r, execConfig); err != nil {
return err
}
if len(execConfig.Cmd) == 0 {
return execCommandError{}
}
version := httputils.VersionFromContext(ctx)
if versions.LessThan(version, "1.42") {
// Not supported by API versions before 1.42
execConfig.ConsoleSize = nil
}
// Register an instance of Exec in container.
id, err := s.backend.ContainerExecCreate(vars["name"], execConfig)
if err != nil {
log.G(ctx).Errorf("Error setting up exec command in container %s: %v", vars["name"], err)
return err
}
return httputils.WriteJSON(w, http.StatusCreated, &types.IDResponse{
ID: id,
})
}
// TODO(vishh): Refactor the code to avoid having to specify stream config as part of both create and start.
func (s *containerRouter) postContainerExecStart(ctx context.Context, w http.ResponseWriter, r *http.Request, vars map[string]string) error {
if err := httputils.ParseForm(r); err != nil {
return err
}
var (
execName = vars["name"]
stdin, inStream io.ReadCloser
stdout, stderr, outStream io.Writer
)
execStartCheck := &types.ExecStartCheck{}
if err := httputils.ReadJSON(r, execStartCheck); err != nil {
return err
}
if exists, err := s.backend.ExecExists(execName); !exists {
return err
}
if execStartCheck.ConsoleSize != nil {
version := httputils.VersionFromContext(ctx)
// Not supported before 1.42
if versions.LessThan(version, "1.42") {
execStartCheck.ConsoleSize = nil
}
// No console without tty
if !execStartCheck.Tty {
execStartCheck.ConsoleSize = nil
}
}
if !execStartCheck.Detach {
var err error
// Setting up the streaming http interface.
inStream, outStream, err = httputils.HijackConnection(w)
if err != nil {
return err
}
defer httputils.CloseStreams(inStream, outStream)
if _, ok := r.Header["Upgrade"]; ok {
contentType := types.MediaTypeRawStream
if !execStartCheck.Tty && versions.GreaterThanOrEqualTo(httputils.VersionFromContext(ctx), "1.42") {
contentType = types.MediaTypeMultiplexedStream
}
fmt.Fprint(outStream, "HTTP/1.1 101 UPGRADED\r\nContent-Type: "+contentType+"\r\nConnection: Upgrade\r\nUpgrade: tcp\r\n")
} else {
fmt.Fprint(outStream, "HTTP/1.1 200 OK\r\nContent-Type: application/vnd.docker.raw-stream\r\n")
}
// copy headers that were removed as part of hijack
if err := w.Header().WriteSubset(outStream, nil); err != nil {
return err
}
fmt.Fprint(outStream, "\r\n")
stdin = inStream
stdout = outStream
if !execStartCheck.Tty {
stderr = stdcopy.NewStdWriter(outStream, stdcopy.Stderr)
stdout = stdcopy.NewStdWriter(outStream, stdcopy.Stdout)
}
}
options := container.ExecStartOptions{
Stdin: stdin,
Stdout: stdout,
Stderr: stderr,
ConsoleSize: execStartCheck.ConsoleSize,
}
// Now run the user process in container.
// Maybe we should we pass ctx here if we're not detaching?
if err := s.backend.ContainerExecStart(context.Background(), execName, options); err != nil {
if execStartCheck.Detach {
return err
}
stdout.Write([]byte(err.Error() + "\r\n"))
log.G(ctx).Errorf("Error running exec %s in container: %v", execName, err)
}
return nil
}
func (s *containerRouter) postContainerExecResize(ctx context.Context, w http.ResponseWriter, r *http.Request, vars map[string]string) error {
if err := httputils.ParseForm(r); err != nil {
return err
}
height, err := strconv.Atoi(r.Form.Get("h"))
if err != nil {
return errdefs.InvalidParameter(err)
}
width, err := strconv.Atoi(r.Form.Get("w"))
if err != nil {
return errdefs.InvalidParameter(err)
}
return s.backend.ContainerExecResize(vars["name"], height, width)
}
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