Add grpc service to shim

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

api/shim/shim.pb.go

@@ -51,6 +51,9 @@ var _ = math.Inf
 const _ = proto.GoGoProtoPackageIsVersion2 // please upgrade the proto package
 
 type CreateRequest struct {
+	ID      string `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
+	Bundle  string `protobuf:"bytes,2,opt,name=bundle,proto3" json:"bundle,omitempty"`
+	Runtime string `protobuf:"bytes,3,opt,name=runtime,proto3" json:"runtime,omitempty"`
 }
 
 func (m *CreateRequest) Reset()                    { *m = CreateRequest{} }
@@ -126,8 +129,11 @@ func (this *CreateRequest) GoString() string {
 	if this == nil {
 		return "nil"
 	}
-	s := make([]string, 0, 4)
+	s := make([]string, 0, 7)
 	s = append(s, "&shim.CreateRequest{")
+	s = append(s, "ID: "+fmt.Sprintf("%#v", this.ID)+",\n")
+	s = append(s, "Bundle: "+fmt.Sprintf("%#v", this.Bundle)+",\n")
+	s = append(s, "Runtime: "+fmt.Sprintf("%#v", this.Runtime)+",\n")
 	s = append(s, "}")
 	return strings.Join(s, "")
 }
@@ -446,6 +452,24 @@ func (m *CreateRequest) MarshalTo(dAtA []byte) (int, error) {
 	_ = i
 	var l int
 	_ = l
+	if len(m.ID) > 0 {
+		dAtA[i] = 0xa
+		i++
+		i = encodeVarintShim(dAtA, i, uint64(len(m.ID)))
+		i += copy(dAtA[i:], m.ID)
+	}
+	if len(m.Bundle) > 0 {
+		dAtA[i] = 0x12
+		i++
+		i = encodeVarintShim(dAtA, i, uint64(len(m.Bundle)))
+		i += copy(dAtA[i:], m.Bundle)
+	}
+	if len(m.Runtime) > 0 {
+		dAtA[i] = 0x1a
+		i++
+		i = encodeVarintShim(dAtA, i, uint64(len(m.Runtime)))
+		i += copy(dAtA[i:], m.Runtime)
+	}
 	return i, nil
 }
 
@@ -636,6 +660,18 @@ func encodeVarintShim(dAtA []byte, offset int, v uint64) int {
 func (m *CreateRequest) Size() (n int) {
 	var l int
 	_ = l
+	l = len(m.ID)
+	if l > 0 {
+		n += 1 + l + sovShim(uint64(l))
+	}
+	l = len(m.Bundle)
+	if l > 0 {
+		n += 1 + l + sovShim(uint64(l))
+	}
+	l = len(m.Runtime)
+	if l > 0 {
+		n += 1 + l + sovShim(uint64(l))
+	}
 	return n
 }
 
@@ -718,6 +754,9 @@ func (this *CreateRequest) String() string {
 		return "nil"
 	}
 	s := strings.Join([]string{`&CreateRequest{`,
+		`ID:` + fmt.Sprintf("%v", this.ID) + `,`,
+		`Bundle:` + fmt.Sprintf("%v", this.Bundle) + `,`,
+		`Runtime:` + fmt.Sprintf("%v", this.Runtime) + `,`,
 		`}`,
 	}, "")
 	return s
@@ -828,6 +867,93 @@ func (m *CreateRequest) Unmarshal(dAtA []byte) error {
 			return fmt.Errorf("proto: CreateRequest: illegal tag %d (wire type %d)", fieldNum, wire)
 		}
 		switch fieldNum {
+		case 1:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field ID", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowShim
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				stringLen |= (uint64(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			intStringLen := int(stringLen)
+			if intStringLen < 0 {
+				return ErrInvalidLengthShim
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.ID = string(dAtA[iNdEx:postIndex])
+			iNdEx = postIndex
+		case 2:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Bundle", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowShim
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				stringLen |= (uint64(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			intStringLen := int(stringLen)
+			if intStringLen < 0 {
+				return ErrInvalidLengthShim
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.Bundle = string(dAtA[iNdEx:postIndex])
+			iNdEx = postIndex
+		case 3:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Runtime", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowShim
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				stringLen |= (uint64(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			intStringLen := int(stringLen)
+			if intStringLen < 0 {
+				return ErrInvalidLengthShim
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.Runtime = string(dAtA[iNdEx:postIndex])
+			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipShim(dAtA[iNdEx:])
@@ -1431,30 +1557,32 @@ var (
 func init() { proto.RegisterFile("shim.proto", fileDescriptorShim) }
 
 var fileDescriptorShim = []byte{
-	// 385 bytes of a gzipped FileDescriptorProto
+	// 419 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x09, 0x6e, 0x88, 0x02, 0xff, 0x74, 0x51, 0xbd, 0x6e, 0xf2, 0x40,
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x09, 0x6e, 0x88, 0x02, 0xff, 0x84, 0x92, 0xbf, 0x8e, 0xd3, 0x40,
-	0x10, 0xc4, 0xe6, 0xc3, 0xd2, 0xb7, 0x60, 0xf8, 0x74, 0x42, 0x88, 0xcf, 0x10, 0x83, 0x5c, 0xa5,
+	0x10, 0xc6, 0xcf, 0x0e, 0x67, 0xc4, 0xe4, 0x1c, 0xd0, 0xea, 0x14, 0x19, 0xe7, 0xf0, 0x9d, 0x5c,
-	0x32, 0x22, 0x69, 0x52, 0x44, 0x8a, 0x44, 0xa0, 0x48, 0x87, 0xec, 0x07, 0x88, 0x0c, 0xde, 0xd8,
+	0x51, 0x39, 0x3a, 0x68, 0x28, 0x90, 0x90, 0x42, 0x52, 0xd0, 0x45, 0x76, 0x45, 0x85, 0x9c, 0x78,
-	0x27, 0x01, 0xe7, 0xd8, 0x07, 0x81, 0x2e, 0x8f, 0x47, 0x99, 0x22, 0x45, 0xaa, 0x28, 0xf8, 0x09,
+	0xb0, 0x57, 0x8a, 0xbd, 0xc6, 0x5e, 0x87, 0xa4, 0xe3, 0xf1, 0x52, 0x52, 0x50, 0x50, 0x21, 0xe2,
-	0xf2, 0x08, 0x91, 0xff, 0x04, 0x98, 0xd0, 0xed, 0xce, 0xce, 0x8d, 0xe6, 0x66, 0x00, 0x02, 0x97,
+	0x27, 0xe0, 0x11, 0xd0, 0xae, 0xd7, 0x90, 0x38, 0x44, 0x74, 0x3b, 0x7f, 0xf4, 0xed, 0x37, 0xbf,
-	0xce, 0x75, 0xcf, 0x67, 0x9c, 0x11, 0x79, 0xca, 0x16, 0xdc, 0xa2, 0x0b, 0xf4, 0x6d, 0x7d, 0xd5,
+	0x19, 0x80, 0x32, 0xa1, 0xa9, 0x97, 0x17, 0x8c, 0x33, 0x62, 0x2e, 0x59, 0xc6, 0x43, 0x9a, 0x61,
-	0x57, 0x5a, 0x0e, 0x63, 0xce, 0x0c, 0x7b, 0xf1, 0x71, 0xb2, 0x7c, 0xea, 0xe1, 0xdc, 0xe3, 0x9b,
+	0x11, 0x79, 0xeb, 0x7b, 0x7b, 0x14, 0x33, 0x16, 0xaf, 0x70, 0x2c, 0x8b, 0x8b, 0xea, 0xe3, 0x18,
-	0x84, 0xab, 0xd4, 0x1d, 0xe6, 0xb0, 0x78, 0xec, 0x45, 0x53, 0x82, 0x6a, 0x35, 0x90, 0xef, 0x7d,
+	0xd3, 0x9c, 0x6f, 0x9b, 0x5e, 0xfb, 0x3a, 0x66, 0x31, 0x93, 0xcf, 0xb1, 0x78, 0x35, 0x59, 0xf7,
-	0xb4, 0x38, 0x1a, 0xf8, 0xbc, 0xc4, 0x80, 0x6b, 0x1a, 0x54, 0x33, 0x20, 0xf0, 0xd8, 0x22, 0x40,
+	0x3d, 0x98, 0x6f, 0x0b, 0x0c, 0x39, 0xfa, 0xf8, 0xa9, 0xc2, 0x92, 0x93, 0x21, 0xe8, 0x34, 0xb2,
-	0xf2, 0x0f, 0x8a, 0x1e, 0xb5, 0x9b, 0x42, 0x57, 0xb8, 0x94, 0x8d, 0x68, 0xd4, 0xaa, 0x50, 0x31,
+	0xb4, 0x3b, 0xed, 0xf9, 0xa3, 0x89, 0x51, 0xff, 0xb8, 0xd5, 0xdf, 0x4d, 0x7d, 0x9d, 0x46, 0x64,
-	0xb9, 0xe5, 0xf3, 0xec, 0x4d, 0x0d, 0xe4, 0x21, 0xce, 0x70, 0x2f, 0xd2, 0x87, 0x6a, 0x06, 0xa4,
+	0x08, 0xc6, 0xa2, 0xca, 0xa2, 0x15, 0x5a, 0xba, 0xa8, 0xf9, 0x2a, 0x22, 0x16, 0x3c, 0x2c, 0xaa,
-	0x22, 0x1d, 0x28, 0xe3, 0x9a, 0xf2, 0xc7, 0x80, 0x5b, 0x7c, 0x19, 0xa4, 0x62, 0x10, 0x41, 0x66,
+	0x8c, 0xd3, 0x14, 0xad, 0x9e, 0x2c, 0xb4, 0xa1, 0xeb, 0xc2, 0xa0, 0x95, 0x2e, 0x73, 0x96, 0x95,
-	0x8c, 0x68, 0x32, 0x94, 0x47, 0x6b, 0x9c, 0x66, 0x0a, 0x5d, 0xa8, 0x24, 0xeb, 0x59, 0x13, 0x06,
+	0x48, 0x9e, 0x40, 0x2f, 0x57, 0xe2, 0xa6, 0x2f, 0x9e, 0xee, 0x00, 0xae, 0x02, 0x1e, 0x16, 0x5c,
-	0xc0, 0x98, 0x6f, 0x52, 0x3e, 0x69, 0x80, 0x98, 0x9e, 0xff, 0x0e, 0xa4, 0xf0, 0xb3, 0x23, 0x3e,
+	0xfd, 0xee, 0x3e, 0x06, 0x73, 0x8a, 0x2b, 0xfc, 0x63, 0xc7, 0xbd, 0x87, 0x41, 0x9b, 0x50, 0x22,
-	0x0c, 0x0d, 0x91, 0xda, 0xa4, 0x0e, 0xa5, 0x17, 0x6a, 0x73, 0xb7, 0x29, 0xc6, 0x2f, 0x93, 0x85,
+	0xb7, 0xd0, 0xc7, 0x0d, 0xe5, 0x1f, 0x4a, 0x1e, 0xf2, 0xaa, 0x54, 0x62, 0x20, 0x52, 0x81, 0xcc,
-	0x34, 0x40, 0x72, 0x91, 0x3a, 0x2e, 0x6f, 0x16, 0x63, 0x38, 0xdd, 0xae, 0xde, 0x45, 0x28, 0x9b,
+	0xb8, 0x26, 0xf4, 0x67, 0x1b, 0x5c, 0xb6, 0x0a, 0x77, 0x70, 0xd5, 0x84, 0x67, 0x4d, 0xf8, 0x00,
-	0x2e, 0x9d, 0x9b, 0xe8, 0xaf, 0xe8, 0x14, 0xc9, 0x08, 0xa4, 0x24, 0x0c, 0xd2, 0xd6, 0x8f, 0xa2,
+	0x73, 0xbe, 0xfd, 0x1f, 0x80, 0x6b, 0xb8, 0xfc, 0x4c, 0x23, 0x9e, 0xc8, 0xf9, 0x4d, 0xbf, 0x09,
-	0xd6, 0x8f, 0x42, 0x53, 0x2e, 0xce, 0x5c, 0x53, 0xf3, 0xb7, 0x50, 0x8a, 0xf3, 0x22, 0xad, 0x1c,
+	0x04, 0x96, 0x04, 0x69, 0x9c, 0x70, 0x39, 0xbd, 0xe9, 0xab, 0xe8, 0xc5, 0x37, 0x1d, 0xfa, 0x41,
-	0xef, 0x30, 0x45, 0xa5, 0xa1, 0x27, 0xf5, 0xe9, 0x59, 0x7d, 0xfa, 0x28, 0xaa, 0x2f, 0x32, 0x91,
+	0x42, 0xd3, 0x00, 0x8b, 0x35, 0x5d, 0x22, 0x99, 0x81, 0xd1, 0xc0, 0x20, 0x37, 0xde, 0xd1, 0xd2,
-	0x84, 0x79, 0x62, 0xe2, 0x28, 0xf4, 0x13, 0x13, 0xb9, 0x06, 0xee, 0xe0, 0x4f, 0x94, 0x28, 0x51,
+	0xbc, 0x23, 0xfc, 0xf6, 0xb3, 0x33, 0x55, 0x65, 0xfe, 0x35, 0x5c, 0x4a, 0x5e, 0x64, 0xd4, 0xe9,
-	0x72, 0xb4, 0x83, 0xd4, 0x95, 0xd6, 0xaf, 0xb7, 0x54, 0xe0, 0x06, 0x8a, 0x63, 0xbe, 0x21, 0xff,
+	0x3b, 0xa4, 0x68, 0x0f, 0xbd, 0xe6, 0x10, 0xbc, 0xf6, 0x10, 0xbc, 0x99, 0x38, 0x04, 0x61, 0xa2,
-	0x73, 0x9c, 0x7d, 0x09, 0xe7, 0x7e, 0x30, 0x68, 0x6f, 0x77, 0x6a, 0xe1, 0x63, 0xa7, 0x16, 0xbe,
+	0x81, 0x79, 0x62, 0xe2, 0x08, 0xfa, 0x89, 0x89, 0xce, 0x06, 0xde, 0xc0, 0x03, 0x41, 0x94, 0xd8,
-	0x77, 0xaa, 0xf0, 0x1a, 0xaa, 0xc2, 0x36, 0x54, 0x85, 0xb7, 0x50, 0x15, 0xbe, 0x42, 0x55, 0x98,
+	0x9d, 0xb6, 0x03, 0xea, 0xf6, 0xe8, 0x9f, 0x35, 0x25, 0xf0, 0x0a, 0x7a, 0x73, 0xbe, 0x25, 0x4f,
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+	0x3b, 0x3d, 0x7f, 0x97, 0x70, 0x6e, 0x82, 0xc9, 0xcd, 0x6e, 0xef, 0x5c, 0x7c, 0xdf, 0x3b, 0x17,
-	0x00,
+	0xbf, 0xf6, 0x8e, 0xf6, 0xa5, 0x76, 0xb4, 0x5d, 0xed, 0x68, 0x5f, 0x6b, 0x47, 0xfb, 0x59, 0x3b,
+	0xda, 0xc2, 0x90, 0xdd, 0x2f, 0x7f, 0x07, 0x00, 0x00, 0xff, 0xff, 0x98, 0x18, 0x12, 0xde, 0x23,
+	0x03, 0x00, 0x00,
 }

api/shim/shim.proto

@@ -14,7 +14,9 @@ service ShimService {
 }
 
 message CreateRequest {
-
+	string id = 1 [(gogoproto.customname) = "ID"];
+    string bundle = 2;
+    string runtime = 3;
 }
 
 message CreateResponse {

cmd/containerd-shim/main.go

@@ -1,210 +1,104 @@
 package main
 
 import (
-	"flag"
 	"fmt"
 	"os"
 	"os/signal"
-	"path/filepath"
-	"runtime"
 	"syscall"
 
+	"google.golang.org/grpc"
+
+	"github.com/docker/containerd"
+	"github.com/docker/containerd/api/shim"
 	"github.com/docker/containerd/sys"
-	"github.com/docker/docker/pkg/term"
+	"github.com/docker/containerd/utils"
+	"github.com/sirupsen/logrus"
+	"github.com/urfave/cli"
 )
 
-func writeMessage(f *os.File, level string, err error) {
+const usage = `
-	fmt.Fprintf(f, `{"level": "%s","msg": "%s"}`, level, err)
+                    __        _                     __           __    _         
-	f.Sync()
+  _________  ____  / /_____ _(_)___  ___  _________/ /     _____/ /_  (_)___ ___ 
-}
+ / ___/ __ \/ __ \/ __/ __ ` + "`" + `/ / __ \/ _ \/ ___/ __  /_____/ ___/ __ \/ / __ ` + "`" + `__ \
+/ /__/ /_/ / / / / /_/ /_/ / / / / /  __/ /  / /_/ /_____(__  ) / / / / / / / / /
+\___/\____/_/ /_/\__/\__,_/_/_/ /_/\___/_/   \__,_/     /____/_/ /_/_/_/ /_/ /_/ 
                                                                                  
-type controlMessage struct {
+shim for container lifecycle and reconnection
-	Type   int
+`
-	Width  int
-	Height int
-}
 
-// containerd-shim is a small shim that sits in front of a runtime implementation
-// that allows it to be reparented to init and handle reattach from the caller.
-//
-// the cwd of the shim should be the path to the state directory where the shim
-// can locate fifos and other information.
-// Arg0: id of the container
-// Arg1: bundle path
-// Arg2: runtime binary
 func main() {
-	flag.Parse()
+	app := cli.NewApp()
-	cwd, err := os.Getwd()
+	app.Name = "containerd-shim"
+	app.Version = containerd.Version
+	app.Usage = usage
+	app.Flags = []cli.Flag{
+		cli.BoolFlag{
+			Name:  "debug",
+			Usage: "enable debug output in logs",
+		},
+	}
+	app.Before = func(context *cli.Context) error {
+		if context.GlobalBool("debug") {
+			logrus.SetLevel(logrus.DebugLevel)
+		}
+		return nil
+	}
+	app.Action = func(context *cli.Context) error {
+		// start handling signals as soon as possible so that things are properly reaped
+		// or if runtime exits before we hit the handler
+		signals, err := setupSignals()
 		if err != nil {
-		panic(err)
+			return err
 		}
-	f, err := os.OpenFile(filepath.Join(cwd, "shim-log.json"), os.O_CREATE|os.O_WRONLY|os.O_APPEND|os.O_SYNC, 0666)
+		var (
+			server = grpc.NewServer()
+			sv     = &service{}
+		)
+		shim.RegisterShimServiceServer(server, sv)
+		l, err := utils.CreateUnixSocket("shim.sock")
 		if err != nil {
-		panic(err)
+			return err
 		}
-	if err := start(f); err != nil {
+		go func() {
-		// this means that the runtime failed starting the container and will have the
+			defer l.Close()
-		// proper error messages in the runtime log so we should to treat this as a
+			if err := server.Serve(l); err != nil {
-		// shim failure because the sim executed properly
+				l.Close()
-		if err == errRuntime {
+				logrus.WithError(err).Fatal("containerd-shim: GRPC server failure")
-			f.Close()
-			return
 			}
-		// log the error instead of writing to stderr because the shim will have
+		}()
-		// /dev/null as it's stdio because it is supposed to be reparented to system
+		for s := range signals {
-		// init and will not have anyone to read from it
+			switch s {
-		writeMessage(f, "error", err)
+			case syscall.SIGCHLD:
-		f.Close()
+				exits, err := utils.Reap(false)
+				if err != nil {
+					logrus.WithError(err).Error("reap exit status")
+				}
+				for _, e := range exits {
+					if err := sv.processExited(e); err != nil {
+						return err
+					}
+				}
+			case syscall.SIGTERM, syscall.SIGINT:
+				server.GracefulStop()
+				return nil
+			}
+		}
+		return nil
+	}
+	if err := app.Run(os.Args); err != nil {
+		fmt.Fprintf(os.Stderr, "containerd-shim: %s\n", err)
 		os.Exit(1)
 	}
 }
 
-func start(log *os.File) error {
+// setupSignals creates a new signal handler for all signals and sets the shim as a
-	// start handling signals as soon as possible so that things are properly reaped
+// sub-reaper so that the container processes are reparented
-	// or if runtime exits before we hit the handler
+func setupSignals() (chan os.Signal, error) {
 	signals := make(chan os.Signal, 2048)
 	signal.Notify(signals)
 	// set the shim as the subreaper for all orphaned processes created by the container
 	if err := sys.SetSubreaper(1); err != nil {
-		return err
+		return nil, err
 	}
-	// open the exit pipe
+	return signals, nil
-	f, err := os.OpenFile("exit", syscall.O_WRONLY, 0)
-	if err != nil {
-		return err
-	}
-	defer f.Close()
-	control, err := os.OpenFile("control", syscall.O_RDWR, 0)
-	if err != nil {
-		return err
-	}
-	defer control.Close()
-	p, err := newProcess(flag.Arg(0), flag.Arg(1), flag.Arg(2))
-	if err != nil {
-		return err
-	}
-	defer func() {
-		if err := p.Close(); err != nil {
-			writeMessage(log, "warn", err)
-		}
-	}()
-	if err := p.create(); err != nil {
-		p.delete()
-		return err
-	}
-	msgC := make(chan controlMessage, 32)
-	go func() {
-		for {
-			var m controlMessage
-			if _, err := fmt.Fscanf(control, "%d %d %d\n", &m.Type, &m.Width, &m.Height); err != nil {
-				continue
-			}
-			msgC <- m
-		}
-	}()
-	if runtime.GOOS == "solaris" {
-		return nil
-	}
-	var exitShim bool
-	for !exitShim {
-		select {
-		case s := <-signals:
-			switch s {
-			case syscall.SIGCHLD:
-				exits, _ := Reap(false)
-				for _, e := range exits {
-					// check to see if runtime is one of the processes that has exited
-					if e.Pid == p.pid() {
-						exitShim = true
-						writeInt("exitStatus", e.Status)
-					}
-				}
-			}
-		case msg := <-msgC:
-			switch msg.Type {
-			case 0:
-				// close stdin
-				if p.stdinCloser != nil {
-					p.stdinCloser.Close()
-				}
-			case 1:
-				if p.console == nil {
-					continue
-				}
-				ws := term.Winsize{
-					Width:  uint16(msg.Width),
-					Height: uint16(msg.Height),
-				}
-				term.SetWinsize(p.console.Fd(), &ws)
-			}
-		}
-	}
-
-	// runtime has exited so the shim can also exit
-
-	// kill all processes in the container incase it was not running in
-	// its own PID namespace
-	p.killAll()
-	// wait for all the processes and IO to finish
-	p.Wait()
-	// delete the container from the runtime
-	p.delete()
-	// the close of the exit fifo will happen when the shim exits
-	return nil
-}
-
-func writeInt(path string, i int) error {
-	f, err := os.Create(path)
-	if err != nil {
-		return err
-	}
-	defer f.Close()
-	_, err = fmt.Fprintf(f, "%d", i)
-	return err
-}
-
-// Exit is the wait4 information from an exited process
-type Exit struct {
-	Pid    int
-	Status int
-}
-
-// Reap reaps all child processes for the calling process and returns their
-// exit information
-func Reap(wait bool) (exits []Exit, err error) {
-	var (
-		ws  syscall.WaitStatus
-		rus syscall.Rusage
-	)
-	flag := syscall.WNOHANG
-	if wait {
-		flag = 0
-	}
-	for {
-		pid, err := syscall.Wait4(-1, &ws, flag, &rus)
-		if err != nil {
-			if err == syscall.ECHILD {
-				return exits, nil
-			}
-			return exits, err
-		}
-		if pid <= 0 {
-			return exits, nil
-		}
-		exits = append(exits, Exit{
-			Pid:    pid,
-			Status: exitStatus(ws),
-		})
-	}
-}
-
-const exitSignalOffset = 128
-
-// exitStatus returns the correct exit status for a process based on if it
-// was signaled or exited cleanly
-func exitStatus(status syscall.WaitStatus) int {
-	if status.Signaled() {
-		return exitSignalOffset + int(status.Signal())
-	}
-	return status.ExitStatus()
 }

cmd/containerd-shim/process.go

@@ -64,6 +64,7 @@ type process struct {
 	consolePath    string
 	state          *processState
 	runtime        string
+	exitStatus     int
 }
 
 func newProcess(id, bundle, runtimeName string) (*process, error) {
@@ -273,10 +274,25 @@ func (p *process) initializeIO(rootuid int) (i *IO, err error) {
 	}
 	return i, nil
 }
+
 func (p *process) Close() error {
 	return p.stdio.Close()
 }
 
+func (p *process) start() error {
+	cmd := exec.Command(p.runtime, append(p.state.RuntimeArgs, "start", p.id)...)
+	cmd.SysProcAttr = setPDeathSig()
+	out, err := cmd.CombinedOutput()
+	if err != nil {
+		return fmt.Errorf("%s: %v", out, err)
+	}
+	return nil
+}
+
+func (p *process) setExited(status int) {
+	p.exitStatus = status
+}
+
 type stdio struct {
 	stdin  *os.File
 	stdout *os.File

cmd/containerd-shim/service.go

@@ -0,0 +1,72 @@
+package main
+
+import (
+	"github.com/docker/containerd/api/shim"
+	"github.com/docker/containerd/utils"
+	"github.com/docker/docker/pkg/term"
+	google_protobuf "github.com/golang/protobuf/ptypes/empty"
+	"golang.org/x/net/context"
+)
+
+type service struct {
+	init *process
+}
+
+func (s *service) Create(ctx context.Context, r *shim.CreateRequest) (*shim.CreateResponse, error) {
+	process, err := newProcess(r.ID, r.Bundle, r.Runtime)
+	if err != nil {
+		return nil, err
+	}
+	s.init = process
+	if err := process.create(); err != nil {
+		return nil, err
+	}
+	return &shim.CreateResponse{
+		Pid: uint32(process.pid()),
+	}, nil
+}
+
+func (s *service) Start(ctx context.Context, r *shim.StartRequest) (*google_protobuf.Empty, error) {
+	err := s.init.start()
+	return nil, err
+}
+
+func (s *service) Delete(ctx context.Context, r *shim.DeleteRequest) (*shim.DeleteResponse, error) {
+	// TODO: error when container has not stopped
+	err := s.init.killAll()
+	s.init.Wait()
+	if derr := s.init.delete(); err == nil {
+		err = derr
+	}
+	if cerr := s.init.Close(); err == nil {
+		err = cerr
+	}
+	return &shim.DeleteResponse{
+		ExitStatus: uint32(s.init.exitStatus),
+	}, err
+}
+
+func (s *service) Exec(ctx context.Context, r *shim.ExecRequest) (*shim.ExecResponse, error) {
+	return nil, nil
+}
+
+func (s *service) Pty(ctx context.Context, r *shim.PtyRequest) (*google_protobuf.Empty, error) {
+	if s.init.console == nil {
+		return nil, nil
+	}
+	ws := term.Winsize{
+		Width:  uint16(r.Width),
+		Height: uint16(r.Height),
+	}
+	if err := term.SetWinsize(s.init.console.Fd(), &ws); err != nil {
+		return nil, err
+	}
+	return nil, nil
+}
+
+func (s *service) processExited(e utils.Exit) error {
+	if s.init.pid() == e.Pid {
+		s.init.setExited(e.Status)
+	}
+	return nil
+}

cmd/containerd/main.go

@@ -23,6 +23,7 @@ import (
 	"github.com/docker/containerd/execution"
 	"github.com/docker/containerd/execution/executors/shim"
 	"github.com/docker/containerd/log"
+	"github.com/docker/containerd/utils"
 	metrics "github.com/docker/go-metrics"
 	"github.com/urfave/cli"
 
@@ -30,11 +31,7 @@ import (
 	stand "github.com/nats-io/nats-streaming-server/server"
 )
 
-func main() {
+const usage = `
-	app := cli.NewApp()
-	app.Name = "containerd"
-	app.Version = containerd.Version
-	app.Usage = `
                     __        _                     __
   _________  ____  / /_____ _(_)___  ___  _________/ /
  / ___/ __ \/ __ \/ __/ __ ` + "`" + `/ / __ \/ _ \/ ___/ __  /
@@ -43,6 +40,12 @@ func main() {
 
 high performance container runtime
 `
+
+func main() {
+	app := cli.NewApp()
+	app.Name = "containerd"
+	app.Version = containerd.Version
+	app.Usage = usage
 	app.Flags = []cli.Flag{
 		cli.BoolFlag{
 			Name:  "debug",
@@ -98,7 +101,7 @@ high performance container runtime
 		if path == "" {
 			return fmt.Errorf("--socket path cannot be empty")
 		}
-		l, err := createUnixSocket(path)
+		l, err := utils.CreateUnixSocket(path)
 		if err != nil {
 			return err
 		}
@@ -171,16 +174,6 @@ high performance container runtime
 	}
 }
 
-func createUnixSocket(path string) (net.Listener, error) {
-	if err := os.MkdirAll(filepath.Dir(path), 0660); err != nil {
-		return nil, err
-	}
-	if err := syscall.Unlink(path); err != nil && !os.IsNotExist(err) {
-		return nil, err
-	}
-	return net.Listen("unix", path)
-}
-
 func serveMetrics(address string) {
 	m := http.NewServeMux()
 	m.Handle("/metrics", metrics.Handler())

utils/reaper.go

@@ -0,0 +1,49 @@
+package utils
+
+import "syscall"
+
+// Exit is the wait4 information from an exited process
+type Exit struct {
+	Pid    int
+	Status int
+}
+
+// Reap reaps all child processes for the calling process and returns their
+// exit information
+func Reap(wait bool) (exits []Exit, err error) {
+	var (
+		ws  syscall.WaitStatus
+		rus syscall.Rusage
+	)
+	flag := syscall.WNOHANG
+	if wait {
+		flag = 0
+	}
+	for {
+		pid, err := syscall.Wait4(-1, &ws, flag, &rus)
+		if err != nil {
+			if err == syscall.ECHILD {
+				return exits, nil
+			}
+			return exits, err
+		}
+		if pid <= 0 {
+			return exits, nil
+		}
+		exits = append(exits, Exit{
+			Pid:    pid,
+			Status: ExitStatus(ws),
+		})
+	}
+}
+
+const exitSignalOffset = 128
+
+// ExitStatus returns the correct exit status for a process based on if it
+// was signaled or exited cleanly
+func ExitStatus(status syscall.WaitStatus) int {
+	if status.Signaled() {
+		return exitSignalOffset + int(status.Signal())
+	}
+	return status.ExitStatus()
+}

utils/socket.go

@@ -0,0 +1,19 @@
+package utils
+
+import (
+	"net"
+	"os"
+	"path/filepath"
+	"syscall"
+)
+
+// CreateUnixSocket creates a unix socket and returns the listener
+func CreateUnixSocket(path string) (net.Listener, error) {
+	if err := os.MkdirAll(filepath.Dir(path), 0660); err != nil {
+		return nil, err
+	}
+	if err := syscall.Unlink(path); err != nil && !os.IsNotExist(err) {
+		return nil, err
+	}
+	return net.Listen("unix", path)
+}