github.com/sijibomii/docker@v0.0.0-20231230191044-5cf6ca554647/api/server/router/container/exec.go (about)

     1  package container
     2  
     3  import (
     4  	"encoding/json"
     5  	"fmt"
     6  	"io"
     7  	"net/http"
     8  	"strconv"
     9  
    10  	"github.com/Sirupsen/logrus"
    11  	"github.com/docker/docker/api/server/httputils"
    12  	"github.com/docker/docker/pkg/stdcopy"
    13  	"github.com/docker/engine-api/types"
    14  	"golang.org/x/net/context"
    15  )
    16  
    17  func (s *containerRouter) getExecByID(ctx context.Context, w http.ResponseWriter, r *http.Request, vars map[string]string) error {
    18  	eConfig, err := s.backend.ContainerExecInspect(vars["id"])
    19  	if err != nil {
    20  		return err
    21  	}
    22  
    23  	return httputils.WriteJSON(w, http.StatusOK, eConfig)
    24  }
    25  
    26  func (s *containerRouter) postContainerExecCreate(ctx context.Context, w http.ResponseWriter, r *http.Request, vars map[string]string) error {
    27  	if err := httputils.ParseForm(r); err != nil {
    28  		return err
    29  	}
    30  	if err := httputils.CheckForJSON(r); err != nil {
    31  		return err
    32  	}
    33  	name := vars["name"]
    34  
    35  	execConfig := &types.ExecConfig{}
    36  	if err := json.NewDecoder(r.Body).Decode(execConfig); err != nil {
    37  		return err
    38  	}
    39  	execConfig.Container = name
    40  
    41  	if len(execConfig.Cmd) == 0 {
    42  		return fmt.Errorf("No exec command specified")
    43  	}
    44  
    45  	// Register an instance of Exec in container.
    46  	id, err := s.backend.ContainerExecCreate(execConfig)
    47  	if err != nil {
    48  		logrus.Errorf("Error setting up exec command in container %s: %v", name, err)
    49  		return err
    50  	}
    51  
    52  	return httputils.WriteJSON(w, http.StatusCreated, &types.ContainerExecCreateResponse{
    53  		ID: id,
    54  	})
    55  }
    56  
    57  // TODO(vishh): Refactor the code to avoid having to specify stream config as part of both create and start.
    58  func (s *containerRouter) postContainerExecStart(ctx context.Context, w http.ResponseWriter, r *http.Request, vars map[string]string) error {
    59  	if err := httputils.ParseForm(r); err != nil {
    60  		return err
    61  	}
    62  
    63  	version := httputils.VersionFromContext(ctx)
    64  	if version.GreaterThan("1.21") {
    65  		if err := httputils.CheckForJSON(r); err != nil {
    66  			return err
    67  		}
    68  	}
    69  
    70  	var (
    71  		execName                  = vars["name"]
    72  		stdin, inStream           io.ReadCloser
    73  		stdout, stderr, outStream io.Writer
    74  	)
    75  
    76  	execStartCheck := &types.ExecStartCheck{}
    77  	if err := json.NewDecoder(r.Body).Decode(execStartCheck); err != nil {
    78  		return err
    79  	}
    80  
    81  	if exists, err := s.backend.ExecExists(execName); !exists {
    82  		return err
    83  	}
    84  
    85  	if !execStartCheck.Detach {
    86  		var err error
    87  		// Setting up the streaming http interface.
    88  		inStream, outStream, err = httputils.HijackConnection(w)
    89  		if err != nil {
    90  			return err
    91  		}
    92  		defer httputils.CloseStreams(inStream, outStream)
    93  
    94  		if _, ok := r.Header["Upgrade"]; ok {
    95  			fmt.Fprintf(outStream, "HTTP/1.1 101 UPGRADED\r\nContent-Type: application/vnd.docker.raw-stream\r\nConnection: Upgrade\r\nUpgrade: tcp\r\n\r\n")
    96  		} else {
    97  			fmt.Fprintf(outStream, "HTTP/1.1 200 OK\r\nContent-Type: application/vnd.docker.raw-stream\r\n\r\n")
    98  		}
    99  
   100  		stdin = inStream
   101  		stdout = outStream
   102  		if !execStartCheck.Tty {
   103  			stderr = stdcopy.NewStdWriter(outStream, stdcopy.Stderr)
   104  			stdout = stdcopy.NewStdWriter(outStream, stdcopy.Stdout)
   105  		}
   106  	}
   107  
   108  	// Now run the user process in container.
   109  	if err := s.backend.ContainerExecStart(execName, stdin, stdout, stderr); err != nil {
   110  		if execStartCheck.Detach {
   111  			return err
   112  		}
   113  		stdout.Write([]byte(err.Error()))
   114  		logrus.Errorf("Error running exec in container: %v\n", err)
   115  	}
   116  	return nil
   117  }
   118  
   119  func (s *containerRouter) postContainerExecResize(ctx context.Context, w http.ResponseWriter, r *http.Request, vars map[string]string) error {
   120  	if err := httputils.ParseForm(r); err != nil {
   121  		return err
   122  	}
   123  	height, err := strconv.Atoi(r.Form.Get("h"))
   124  	if err != nil {
   125  		return err
   126  	}
   127  	width, err := strconv.Atoi(r.Form.Get("w"))
   128  	if err != nil {
   129  		return err
   130  	}
   131  
   132  	return s.backend.ContainerExecResize(vars["name"], height, width)
   133  }