30 files changed, 18 insertions, 758 deletions
diff --git a/pkg/shim/v2/api.go b/pkg/shim/api.go
index 5a60a04db..6d1741f0c 100644
--- a/pkg/shim/v2/api.go
+++ b/pkg/shim/api.go
@@ -13,7 +13,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package v2
+package shim
 
 import (
 	"github.com/containerd/containerd/api/events"
diff --git a/pkg/shim/v2/epoll.go b/pkg/shim/epoll.go
index 41232cca8..737d2b781 100644
--- a/pkg/shim/v2/epoll.go
+++ b/pkg/shim/epoll.go
@@ -15,7 +15,7 @@
 
 // +build linux
 
-package v2
+package shim
 
 import (
 	"context"
diff --git a/pkg/shim/v2/options.go b/pkg/shim/options.go
index 9db33fd1f..e40a1a07d 100644
--- a/pkg/shim/v2/options.go
+++ b/pkg/shim/options.go
@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package v2
+package shim
 
 const optionsType = "io.containerd.runsc.v1.options"
 
diff --git a/pkg/shim/v1/proc/deleted_state.go b/pkg/shim/proc/deleted_state.go
index d9b970c4d..d9b970c4d 100644
--- a/pkg/shim/v1/proc/deleted_state.go
+++ b/pkg/shim/proc/deleted_state.go
diff --git a/pkg/shim/v1/proc/exec.go b/pkg/shim/proc/exec.go
index 1d1d90488..1d1d90488 100644
--- a/pkg/shim/v1/proc/exec.go
+++ b/pkg/shim/proc/exec.go
diff --git a/pkg/shim/v1/proc/exec_state.go b/pkg/shim/proc/exec_state.go
index 4dcda8b44..4dcda8b44 100644
--- a/pkg/shim/v1/proc/exec_state.go
+++ b/pkg/shim/proc/exec_state.go
diff --git a/pkg/shim/v1/proc/init.go b/pkg/shim/proc/init.go
index 9fd7d978c..cacaade88 100644
--- a/pkg/shim/v1/proc/init.go
+++ b/pkg/shim/proc/init.go
@@ -39,9 +39,6 @@ import (
 	"gvisor.dev/gvisor/pkg/shim/runsc"
 )
 
-// InitPidFile name of the file that contains the init pid.
-const InitPidFile = "init.pid"
-
 // Init represents an initial process for a container.
 type Init struct {
 	wg        sync.WaitGroup
@@ -122,7 +119,8 @@ func (p *Init) Create(ctx context.Context, r *CreateConfig) (err error) {
 			return fmt.Errorf("failed to create OCI runtime io pipes: %w", err)
 		}
 	}
-	pidFile := filepath.Join(p.Bundle, InitPidFile)
+	// pidFile is the file that will contain the sandbox pid.
+	pidFile := filepath.Join(p.Bundle, "init.pid")
 	opts := &runsc.CreateOpts{
 		PidFile: pidFile,
 	}
diff --git a/pkg/shim/v1/proc/init_state.go b/pkg/shim/proc/init_state.go
index 0065fc385..0065fc385 100644
--- a/pkg/shim/v1/proc/init_state.go
+++ b/pkg/shim/proc/init_state.go
diff --git a/pkg/shim/v1/proc/io.go b/pkg/shim/proc/io.go
index 34d825fb7..34d825fb7 100644
--- a/pkg/shim/v1/proc/io.go
+++ b/pkg/shim/proc/io.go
diff --git a/pkg/shim/v1/proc/process.go b/pkg/shim/proc/proc.go
index e8315326d..edba3fca5 100644
--- a/pkg/shim/v1/proc/process.go
+++ b/pkg/shim/proc/proc.go
@@ -13,7 +13,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// Package proc contains process-related utilities.
+// Package proc is responsible to manage the communication between the shim and
+// the sandbox process running the container.
 package proc
 
 import (
diff --git a/pkg/shim/v1/proc/proc_state_autogen.go b/pkg/shim/proc/proc_state_autogen.go
index 210252d9d..210252d9d 100644
--- a/pkg/shim/v1/proc/proc_state_autogen.go
+++ b/pkg/shim/proc/proc_state_autogen.go
diff --git a/pkg/shim/v1/proc/types.go b/pkg/shim/proc/types.go
index fc182cf5e..fc182cf5e 100644
--- a/pkg/shim/v1/proc/types.go
+++ b/pkg/shim/proc/types.go
diff --git a/pkg/shim/v1/proc/utils.go b/pkg/shim/proc/utils.go
index 7c2c409af..7c2c409af 100644
--- a/pkg/shim/v1/proc/utils.go
+++ b/pkg/shim/proc/utils.go
diff --git a/pkg/shim/v2/runtimeoptions/runtimeoptions.go b/pkg/shim/runtimeoptions/runtimeoptions.go
index 072dd87f0..072dd87f0 100644
--- a/pkg/shim/v2/runtimeoptions/runtimeoptions.go
+++ b/pkg/shim/runtimeoptions/runtimeoptions.go
diff --git a/pkg/shim/v2/runtimeoptions/runtimeoptions_cri.go b/pkg/shim/runtimeoptions/runtimeoptions_cri.go
index e6102b4cf..e6102b4cf 100644
--- a/pkg/shim/v2/runtimeoptions/runtimeoptions_cri.go
+++ b/pkg/shim/runtimeoptions/runtimeoptions_cri.go
diff --git a/pkg/shim/v2/runtimeoptions/runtimeoptions_state_autogen.go b/pkg/shim/runtimeoptions/runtimeoptions_state_autogen.go
index f5c883045..f5c883045 100644
--- a/pkg/shim/v2/runtimeoptions/runtimeoptions_state_autogen.go
+++ b/pkg/shim/runtimeoptions/runtimeoptions_state_autogen.go
diff --git a/pkg/shim/v2/service.go b/pkg/shim/service.go
index 6aaf5fab8..9aba26ac7 100644
--- a/pkg/shim/v2/service.go
+++ b/pkg/shim/service.go
@@ -12,8 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// Package v2 implements Containerd Shim v2 interface.
-package v2
+// Package shim implements Containerd Shim v2 interface.
+package shim
 
 import (
 	"context"
@@ -49,10 +49,10 @@ import (
 	"golang.org/x/sys/unix"
 	"gvisor.dev/gvisor/pkg/cleanup"
 
+	"gvisor.dev/gvisor/pkg/shim/proc"
 	"gvisor.dev/gvisor/pkg/shim/runsc"
-	"gvisor.dev/gvisor/pkg/shim/v1/proc"
-	"gvisor.dev/gvisor/pkg/shim/v1/utils"
-	"gvisor.dev/gvisor/pkg/shim/v2/runtimeoptions"
+	"gvisor.dev/gvisor/pkg/shim/runtimeoptions"
+	"gvisor.dev/gvisor/pkg/shim/utils"
 	"gvisor.dev/gvisor/runsc/specutils"
 )
 
diff --git a/pkg/shim/v2/service_linux.go b/pkg/shim/service_linux.go
index 1800ab90b..11622ed60 100644
--- a/pkg/shim/v2/service_linux.go
+++ b/pkg/shim/service_linux.go
@@ -15,7 +15,7 @@
 
 // +build linux
 
-package v2
+package shim
 
 import (
 	"context"
diff --git a/pkg/shim/v2/v2_linux_state_autogen.go b/pkg/shim/shim_linux_state_autogen.go
index 1023f4d8f..191a9e496 100644
--- a/pkg/shim/v2/v2_linux_state_autogen.go
+++ b/pkg/shim/shim_linux_state_autogen.go
@@ -2,4 +2,4 @@
 
 // +build linux
 
-package v2
+package shim
diff --git a/pkg/shim/v1/shim/shim_state_autogen.go b/pkg/shim/shim_state_autogen.go
index ce6579b97..191a9e496 100644
--- a/pkg/shim/v1/shim/shim_state_autogen.go
+++ b/pkg/shim/shim_state_autogen.go
@@ -1,3 +1,5 @@
 // automatically generated by stateify.
 
+// +build linux
+
 package shim
diff --git a/pkg/shim/v2/state.go b/pkg/shim/state.go
index 1f4be33d3..5e9e92ec3 100644
--- a/pkg/shim/v2/state.go
+++ b/pkg/shim/state.go
@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package v2
+package shim
 
 import (
 	"encoding/json"
diff --git a/pkg/shim/v1/utils/annotations.go b/pkg/shim/utils/annotations.go
index 1e9d3f365..1e9d3f365 100644
--- a/pkg/shim/v1/utils/annotations.go
+++ b/pkg/shim/utils/annotations.go
diff --git a/pkg/shim/v1/utils/utils.go b/pkg/shim/utils/utils.go
index 21e75d16d..7b1cd983e 100644
--- a/pkg/shim/v1/utils/utils.go
+++ b/pkg/shim/utils/utils.go
@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// Package utils contains utility functions.
+// Package utils container miscellaneous utility function used by the shim.
 package utils
 
 import (
diff --git a/pkg/shim/v1/utils/utils_state_autogen.go b/pkg/shim/utils/utils_state_autogen.go
index dba8bfb1a..dba8bfb1a 100644
--- a/pkg/shim/v1/utils/utils_state_autogen.go
+++ b/pkg/shim/utils/utils_state_autogen.go
diff --git a/pkg/shim/v1/utils/volumes.go b/pkg/shim/utils/volumes.go
index 52a428179..52a428179 100644
--- a/pkg/shim/v1/utils/volumes.go
+++ b/pkg/shim/utils/volumes.go
diff --git a/pkg/shim/v1/shim/api.go b/pkg/shim/v1/shim/api.go
deleted file mode 100644
index 8200eb012..000000000
--- a/pkg/shim/v1/shim/api.go
+++ /dev/null
@@ -1,41 +0,0 @@
-// Copyright 2018 The containerd Authors.
-// Copyright 2019 The gVisor Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package shim
-
-import (
-	"github.com/containerd/containerd/api/events"
-)
-
-// TaskCreate is an alias for events.TaskCreate.
-type TaskCreate = events.TaskCreate
-
-// TaskStart is an alias for events.TaskStart.
-type TaskStart = events.TaskStart
-
-// TaskOOM is an alias for events.TaskOOM.
-type TaskOOM = events.TaskOOM
-
-// TaskExit is an alias for events.TaskExit.
-type TaskExit = events.TaskExit
-
-// TaskDelete is an alias for events.TaskDelete.
-type TaskDelete = events.TaskDelete
-
-// TaskExecAdded is an alias for events.TaskExecAdded.
-type TaskExecAdded = events.TaskExecAdded
-
-// TaskExecStarted is an alias for events.TaskExecStarted.
-type TaskExecStarted = events.TaskExecStarted
diff --git a/pkg/shim/v1/shim/platform.go b/pkg/shim/v1/shim/platform.go
deleted file mode 100644
index f590f80ef..000000000
--- a/pkg/shim/v1/shim/platform.go
+++ /dev/null
@@ -1,106 +0,0 @@
-// Copyright 2018 The containerd Authors.
-// Copyright 2019 The gVisor Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package shim
-
-import (
-	"context"
-	"fmt"
-	"io"
-	"sync"
-	"syscall"
-
-	"github.com/containerd/console"
-	"github.com/containerd/fifo"
-)
-
-type linuxPlatform struct {
-	epoller *console.Epoller
-}
-
-func (p *linuxPlatform) CopyConsole(ctx context.Context, console console.Console, stdin, stdout, stderr string, wg *sync.WaitGroup) (console.Console, error) {
-	if p.epoller == nil {
-		return nil, fmt.Errorf("uninitialized epoller")
-	}
-
-	epollConsole, err := p.epoller.Add(console)
-	if err != nil {
-		return nil, err
-	}
-
-	if stdin != "" {
-		in, err := fifo.OpenFifo(ctx, stdin, syscall.O_RDONLY, 0)
-		if err != nil {
-			return nil, err
-		}
-		go func() {
-			p := bufPool.Get().(*[]byte)
-			defer bufPool.Put(p)
-			io.CopyBuffer(epollConsole, in, *p)
-		}()
-	}
-
-	outw, err := fifo.OpenFifo(ctx, stdout, syscall.O_WRONLY, 0)
-	if err != nil {
-		return nil, err
-	}
-	outr, err := fifo.OpenFifo(ctx, stdout, syscall.O_RDONLY, 0)
-	if err != nil {
-		return nil, err
-	}
-	wg.Add(1)
-	go func() {
-		p := bufPool.Get().(*[]byte)
-		defer bufPool.Put(p)
-		io.CopyBuffer(outw, epollConsole, *p)
-		epollConsole.Close()
-		outr.Close()
-		outw.Close()
-		wg.Done()
-	}()
-	return epollConsole, nil
-}
-
-func (p *linuxPlatform) ShutdownConsole(ctx context.Context, cons console.Console) error {
-	if p.epoller == nil {
-		return fmt.Errorf("uninitialized epoller")
-	}
-	epollConsole, ok := cons.(*console.EpollConsole)
-	if !ok {
-		return fmt.Errorf("expected EpollConsole, got %#v", cons)
-	}
-	return epollConsole.Shutdown(p.epoller.CloseConsole)
-}
-
-func (p *linuxPlatform) Close() error {
-	return p.epoller.Close()
-}
-
-// initialize a single epoll fd to manage our consoles. `initPlatform` should
-// only be called once.
-func (s *Service) initPlatform() error {
-	if s.platform != nil {
-		return nil
-	}
-	epoller, err := console.NewEpoller()
-	if err != nil {
-		return fmt.Errorf("failed to initialize epoller: %w", err)
-	}
-	s.platform = &linuxPlatform{
-		epoller: epoller,
-	}
-	go epoller.Wait()
-	return nil
-}
diff --git a/pkg/shim/v1/shim/service.go b/pkg/shim/v1/shim/service.go
deleted file mode 100644
index 80aa59b33..000000000
--- a/pkg/shim/v1/shim/service.go
+++ /dev/null
@@ -1,572 +0,0 @@
-// Copyright 2018 The containerd Authors.
-// Copyright 2019 The gVisor Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package shim
-
-import (
-	"context"
-	"fmt"
-	"os"
-	"path/filepath"
-	"sync"
-
-	"github.com/containerd/console"
-	"github.com/containerd/containerd/api/types/task"
-	"github.com/containerd/containerd/errdefs"
-	"github.com/containerd/containerd/events"
-	"github.com/containerd/containerd/log"
-	"github.com/containerd/containerd/mount"
-	"github.com/containerd/containerd/namespaces"
-	"github.com/containerd/containerd/pkg/process"
-	"github.com/containerd/containerd/pkg/stdio"
-	"github.com/containerd/containerd/runtime"
-	"github.com/containerd/containerd/runtime/linux/runctypes"
-	shim "github.com/containerd/containerd/runtime/v1/shim/v1"
-	"github.com/containerd/containerd/sys/reaper"
-	"github.com/containerd/typeurl"
-	"github.com/gogo/protobuf/types"
-	"google.golang.org/grpc/codes"
-	"google.golang.org/grpc/status"
-
-	"gvisor.dev/gvisor/pkg/shim/runsc"
-	"gvisor.dev/gvisor/pkg/shim/v1/proc"
-	"gvisor.dev/gvisor/pkg/shim/v1/utils"
-)
-
-var (
-	empty   = &types.Empty{}
-	bufPool = sync.Pool{
-		New: func() interface{} {
-			buffer := make([]byte, 32<<10)
-			return &buffer
-		},
-	}
-)
-
-// Config contains shim specific configuration.
-type Config struct {
-	Path        string
-	Namespace   string
-	WorkDir     string
-	RuntimeRoot string
-	RunscConfig map[string]string
-}
-
-// NewService returns a new shim service that can be used via GRPC.
-func NewService(config Config, publisher events.Publisher) (*Service, error) {
-	if config.Namespace == "" {
-		return nil, fmt.Errorf("shim namespace cannot be empty")
-	}
-	ctx := namespaces.WithNamespace(context.Background(), config.Namespace)
-	s := &Service{
-		config:    config,
-		context:   ctx,
-		processes: make(map[string]process.Process),
-		events:    make(chan interface{}, 128),
-		ec:        proc.ExitCh,
-	}
-	go s.processExits()
-	if err := s.initPlatform(); err != nil {
-		return nil, fmt.Errorf("failed to initialized platform behavior: %w", err)
-	}
-	go s.forward(publisher)
-	return s, nil
-}
-
-// Service is the shim implementation of a remote shim over GRPC.
-type Service struct {
-	mu sync.Mutex
-
-	config    Config
-	context   context.Context
-	processes map[string]process.Process
-	events    chan interface{}
-	platform  stdio.Platform
-	ec        chan proc.Exit
-
-	// Filled by Create()
-	id     string
-	bundle string
-}
-
-// Create creates a new initial process and container with the underlying OCI runtime.
-func (s *Service) Create(ctx context.Context, r *shim.CreateTaskRequest) (_ *shim.CreateTaskResponse, err error) {
-	s.mu.Lock()
-	defer s.mu.Unlock()
-
-	var mounts []proc.Mount
-	for _, m := range r.Rootfs {
-		mounts = append(mounts, proc.Mount{
-			Type:    m.Type,
-			Source:  m.Source,
-			Target:  m.Target,
-			Options: m.Options,
-		})
-	}
-
-	rootfs := filepath.Join(r.Bundle, "rootfs")
-	if err := os.Mkdir(rootfs, 0711); err != nil && !os.IsExist(err) {
-		return nil, err
-	}
-
-	config := &proc.CreateConfig{
-		ID:       r.ID,
-		Bundle:   r.Bundle,
-		Runtime:  r.Runtime,
-		Rootfs:   mounts,
-		Terminal: r.Terminal,
-		Stdin:    r.Stdin,
-		Stdout:   r.Stdout,
-		Stderr:   r.Stderr,
-	}
-	defer func() {
-		if err != nil {
-			if err2 := mount.UnmountAll(rootfs, 0); err2 != nil {
-				log.G(ctx).WithError(err2).Warn("Failed to cleanup rootfs mount")
-			}
-		}
-	}()
-	for _, rm := range mounts {
-		m := &mount.Mount{
-			Type:    rm.Type,
-			Source:  rm.Source,
-			Options: rm.Options,
-		}
-		if err := m.Mount(rootfs); err != nil {
-			return nil, fmt.Errorf("failed to mount rootfs component %v: %w", m, err)
-		}
-	}
-	process, err := newInit(
-		s.config.Path,
-		s.config.WorkDir,
-		s.config.RuntimeRoot,
-		s.config.Namespace,
-		s.config.RunscConfig,
-		s.platform,
-		config,
-		r.Options,
-	)
-	if err := process.Create(ctx, config); err != nil {
-		return nil, errdefs.ToGRPC(err)
-	}
-	// Save the main task id and bundle to the shim for additional
-	// requests.
-	s.id = r.ID
-	s.bundle = r.Bundle
-	pid := process.Pid()
-	s.processes[r.ID] = process
-	return &shim.CreateTaskResponse{
-		Pid: uint32(pid),
-	}, nil
-}
-
-// Start starts a process.
-func (s *Service) Start(ctx context.Context, r *shim.StartRequest) (*shim.StartResponse, error) {
-	p, err := s.getExecProcess(r.ID)
-	if err != nil {
-		return nil, err
-	}
-	if err := p.Start(ctx); err != nil {
-		return nil, err
-	}
-	return &shim.StartResponse{
-		ID:  p.ID(),
-		Pid: uint32(p.Pid()),
-	}, nil
-}
-
-// Delete deletes the initial process and container.
-func (s *Service) Delete(ctx context.Context, r *types.Empty) (*shim.DeleteResponse, error) {
-	p, err := s.getInitProcess()
-	if err != nil {
-		return nil, err
-	}
-	if err := p.Delete(ctx); err != nil {
-		return nil, err
-	}
-	s.mu.Lock()
-	delete(s.processes, s.id)
-	s.mu.Unlock()
-	s.platform.Close()
-	return &shim.DeleteResponse{
-		ExitStatus: uint32(p.ExitStatus()),
-		ExitedAt:   p.ExitedAt(),
-		Pid:        uint32(p.Pid()),
-	}, nil
-}
-
-// DeleteProcess deletes an exec'd process.
-func (s *Service) DeleteProcess(ctx context.Context, r *shim.DeleteProcessRequest) (*shim.DeleteResponse, error) {
-	if r.ID == s.id {
-		return nil, status.Errorf(codes.InvalidArgument, "cannot delete init process with DeleteProcess")
-	}
-	p, err := s.getExecProcess(r.ID)
-	if err != nil {
-		return nil, err
-	}
-	if err := p.Delete(ctx); err != nil {
-		return nil, err
-	}
-	s.mu.Lock()
-	delete(s.processes, r.ID)
-	s.mu.Unlock()
-	return &shim.DeleteResponse{
-		ExitStatus: uint32(p.ExitStatus()),
-		ExitedAt:   p.ExitedAt(),
-		Pid:        uint32(p.Pid()),
-	}, nil
-}
-
-// Exec spawns an additional process inside the container.
-func (s *Service) Exec(ctx context.Context, r *shim.ExecProcessRequest) (*types.Empty, error) {
-	s.mu.Lock()
-
-	if p := s.processes[r.ID]; p != nil {
-		s.mu.Unlock()
-		return nil, errdefs.ToGRPCf(errdefs.ErrAlreadyExists, "id %s", r.ID)
-	}
-
-	p := s.processes[s.id]
-	s.mu.Unlock()
-	if p == nil {
-		return nil, errdefs.ToGRPCf(errdefs.ErrFailedPrecondition, "container must be created")
-	}
-
-	process, err := p.(*proc.Init).Exec(ctx, s.config.Path, &proc.ExecConfig{
-		ID:       r.ID,
-		Terminal: r.Terminal,
-		Stdin:    r.Stdin,
-		Stdout:   r.Stdout,
-		Stderr:   r.Stderr,
-		Spec:     r.Spec,
-	})
-	if err != nil {
-		return nil, errdefs.ToGRPC(err)
-	}
-	s.mu.Lock()
-	s.processes[r.ID] = process
-	s.mu.Unlock()
-	return empty, nil
-}
-
-// ResizePty resises the terminal of a process.
-func (s *Service) ResizePty(ctx context.Context, r *shim.ResizePtyRequest) (*types.Empty, error) {
-	if r.ID == "" {
-		return nil, errdefs.ToGRPCf(errdefs.ErrInvalidArgument, "id not provided")
-	}
-	ws := console.WinSize{
-		Width:  uint16(r.Width),
-		Height: uint16(r.Height),
-	}
-	p, err := s.getExecProcess(r.ID)
-	if err != nil {
-		return nil, err
-	}
-	if err := p.Resize(ws); err != nil {
-		return nil, errdefs.ToGRPC(err)
-	}
-	return empty, nil
-}
-
-// State returns runtime state information for a process.
-func (s *Service) State(ctx context.Context, r *shim.StateRequest) (*shim.StateResponse, error) {
-	p, err := s.getExecProcess(r.ID)
-	if err != nil {
-		return nil, err
-	}
-	st, err := p.Status(ctx)
-	if err != nil {
-		return nil, err
-	}
-	status := task.StatusUnknown
-	switch st {
-	case "created":
-		status = task.StatusCreated
-	case "running":
-		status = task.StatusRunning
-	case "stopped":
-		status = task.StatusStopped
-	}
-	sio := p.Stdio()
-	return &shim.StateResponse{
-		ID:         p.ID(),
-		Bundle:     s.bundle,
-		Pid:        uint32(p.Pid()),
-		Status:     status,
-		Stdin:      sio.Stdin,
-		Stdout:     sio.Stdout,
-		Stderr:     sio.Stderr,
-		Terminal:   sio.Terminal,
-		ExitStatus: uint32(p.ExitStatus()),
-		ExitedAt:   p.ExitedAt(),
-	}, nil
-}
-
-// Pause pauses the container.
-func (s *Service) Pause(ctx context.Context, r *types.Empty) (*types.Empty, error) {
-	return empty, errdefs.ToGRPC(errdefs.ErrNotImplemented)
-}
-
-// Resume resumes the container.
-func (s *Service) Resume(ctx context.Context, r *types.Empty) (*types.Empty, error) {
-	return empty, errdefs.ToGRPC(errdefs.ErrNotImplemented)
-}
-
-// Kill kills a process with the provided signal.
-func (s *Service) Kill(ctx context.Context, r *shim.KillRequest) (*types.Empty, error) {
-	if r.ID == "" {
-		p, err := s.getInitProcess()
-		if err != nil {
-			return nil, err
-		}
-		if err := p.Kill(ctx, r.Signal, r.All); err != nil {
-			return nil, errdefs.ToGRPC(err)
-		}
-		return empty, nil
-	}
-
-	p, err := s.getExecProcess(r.ID)
-	if err != nil {
-		return nil, err
-	}
-	if err := p.Kill(ctx, r.Signal, r.All); err != nil {
-		return nil, errdefs.ToGRPC(err)
-	}
-	return empty, nil
-}
-
-// ListPids returns all pids inside the container.
-func (s *Service) ListPids(ctx context.Context, r *shim.ListPidsRequest) (*shim.ListPidsResponse, error) {
-	pids, err := s.getContainerPids(ctx, r.ID)
-	if err != nil {
-		return nil, errdefs.ToGRPC(err)
-	}
-	var processes []*task.ProcessInfo
-	for _, pid := range pids {
-		pInfo := task.ProcessInfo{
-			Pid: pid,
-		}
-		for _, p := range s.processes {
-			if p.Pid() == int(pid) {
-				d := &runctypes.ProcessDetails{
-					ExecID: p.ID(),
-				}
-				a, err := typeurl.MarshalAny(d)
-				if err != nil {
-					return nil, fmt.Errorf("failed to marshal process %d info: %w", pid, err)
-				}
-				pInfo.Info = a
-				break
-			}
-		}
-		processes = append(processes, &pInfo)
-	}
-	return &shim.ListPidsResponse{
-		Processes: processes,
-	}, nil
-}
-
-// CloseIO closes the I/O context of a process.
-func (s *Service) CloseIO(ctx context.Context, r *shim.CloseIORequest) (*types.Empty, error) {
-	p, err := s.getExecProcess(r.ID)
-	if err != nil {
-		return nil, err
-	}
-	if stdin := p.Stdin(); stdin != nil {
-		if err := stdin.Close(); err != nil {
-			return nil, fmt.Errorf("close stdin: %w", err)
-		}
-	}
-	return empty, nil
-}
-
-// Checkpoint checkpoints the container.
-func (s *Service) Checkpoint(ctx context.Context, r *shim.CheckpointTaskRequest) (*types.Empty, error) {
-	return empty, errdefs.ToGRPC(errdefs.ErrNotImplemented)
-}
-
-// ShimInfo returns shim information such as the shim's pid.
-func (s *Service) ShimInfo(ctx context.Context, r *types.Empty) (*shim.ShimInfoResponse, error) {
-	return &shim.ShimInfoResponse{
-		ShimPid: uint32(os.Getpid()),
-	}, nil
-}
-
-// Update updates a running container.
-func (s *Service) Update(ctx context.Context, r *shim.UpdateTaskRequest) (*types.Empty, error) {
-	return empty, errdefs.ToGRPC(errdefs.ErrNotImplemented)
-}
-
-// Wait waits for a process to exit.
-func (s *Service) Wait(ctx context.Context, r *shim.WaitRequest) (*shim.WaitResponse, error) {
-	p, err := s.getExecProcess(r.ID)
-	if err != nil {
-		return nil, err
-	}
-	p.Wait()
-
-	return &shim.WaitResponse{
-		ExitStatus: uint32(p.ExitStatus()),
-		ExitedAt:   p.ExitedAt(),
-	}, nil
-}
-
-func (s *Service) processExits() {
-	for e := range s.ec {
-		s.checkProcesses(e)
-	}
-}
-
-func (s *Service) allProcesses() []process.Process {
-	s.mu.Lock()
-	defer s.mu.Unlock()
-
-	res := make([]process.Process, 0, len(s.processes))
-	for _, p := range s.processes {
-		res = append(res, p)
-	}
-	return res
-}
-
-func (s *Service) checkProcesses(e proc.Exit) {
-	for _, p := range s.allProcesses() {
-		if p.ID() == e.ID {
-			if ip, ok := p.(*proc.Init); ok {
-				// Ensure all children are killed.
-				if err := ip.KillAll(s.context); err != nil {
-					log.G(s.context).WithError(err).WithField("id", ip.ID()).
-						Error("failed to kill init's children")
-				}
-			}
-			p.SetExited(e.Status)
-			s.events <- &TaskExit{
-				ContainerID: s.id,
-				ID:          p.ID(),
-				Pid:         uint32(p.Pid()),
-				ExitStatus:  uint32(e.Status),
-				ExitedAt:    p.ExitedAt(),
-			}
-			return
-		}
-	}
-}
-
-func (s *Service) getContainerPids(ctx context.Context, id string) ([]uint32, error) {
-	p, err := s.getInitProcess()
-	if err != nil {
-		return nil, err
-	}
-
-	ps, err := p.(*proc.Init).Runtime().Ps(ctx, id)
-	if err != nil {
-		return nil, err
-	}
-	pids := make([]uint32, 0, len(ps))
-	for _, pid := range ps {
-		pids = append(pids, uint32(pid))
-	}
-	return pids, nil
-}
-
-func (s *Service) forward(publisher events.Publisher) {
-	for e := range s.events {
-		if err := publisher.Publish(s.context, getTopic(s.context, e), e); err != nil {
-			log.G(s.context).WithError(err).Error("post event")
-		}
-	}
-}
-
-// getInitProcess returns the init process.
-func (s *Service) getInitProcess() (process.Process, error) {
-	s.mu.Lock()
-	defer s.mu.Unlock()
-	p := s.processes[s.id]
-	if p == nil {
-		return nil, errdefs.ToGRPCf(errdefs.ErrFailedPrecondition, "container must be created")
-	}
-	return p, nil
-}
-
-// getExecProcess returns the given exec process.
-func (s *Service) getExecProcess(id string) (process.Process, error) {
-	s.mu.Lock()
-	defer s.mu.Unlock()
-	p := s.processes[id]
-	if p == nil {
-		return nil, errdefs.ToGRPCf(errdefs.ErrNotFound, "process %s does not exist", id)
-	}
-	return p, nil
-}
-
-func getTopic(ctx context.Context, e interface{}) string {
-	switch e.(type) {
-	case *TaskCreate:
-		return runtime.TaskCreateEventTopic
-	case *TaskStart:
-		return runtime.TaskStartEventTopic
-	case *TaskOOM:
-		return runtime.TaskOOMEventTopic
-	case *TaskExit:
-		return runtime.TaskExitEventTopic
-	case *TaskDelete:
-		return runtime.TaskDeleteEventTopic
-	case *TaskExecAdded:
-		return runtime.TaskExecAddedEventTopic
-	case *TaskExecStarted:
-		return runtime.TaskExecStartedEventTopic
-	default:
-		log.L.Printf("no topic for type %#v", e)
-	}
-	return runtime.TaskUnknownTopic
-}
-
-func newInit(path, workDir, runtimeRoot, namespace string, config map[string]string, platform stdio.Platform, r *proc.CreateConfig, options *types.Any) (*proc.Init, error) {
-	var opts runctypes.CreateOptions
-	if options != nil {
-		v, err := typeurl.UnmarshalAny(options)
-		if err != nil {
-			return nil, err
-		}
-		opts = *v.(*runctypes.CreateOptions)
-	}
-
-	spec, err := utils.ReadSpec(r.Bundle)
-	if err != nil {
-		return nil, fmt.Errorf("read oci spec: %w", err)
-	}
-	if err := utils.UpdateVolumeAnnotations(r.Bundle, spec); err != nil {
-		return nil, fmt.Errorf("update volume annotations: %w", err)
-	}
-
-	runsc.FormatRunscLogPath(r.ID, config)
-	rootfs := filepath.Join(path, "rootfs")
-	runtime := proc.NewRunsc(runtimeRoot, path, namespace, r.Runtime, config)
-	p := proc.New(r.ID, runtime, stdio.Stdio{
-		Stdin:    r.Stdin,
-		Stdout:   r.Stdout,
-		Stderr:   r.Stderr,
-		Terminal: r.Terminal,
-	})
-	p.Bundle = r.Bundle
-	p.Platform = platform
-	p.Rootfs = rootfs
-	p.WorkDir = workDir
-	p.IoUID = int(opts.IoUid)
-	p.IoGID = int(opts.IoGid)
-	p.Sandbox = utils.IsSandbox(spec)
-	p.UserLog = utils.UserLogPath(spec)
-	p.Monitor = reaper.Default
-	return p, nil
-}
diff --git a/pkg/shim/v1/shim/shim.go b/pkg/shim/v1/shim/shim.go
deleted file mode 100644
index 1855a8769..000000000
--- a/pkg/shim/v1/shim/shim.go
+++ /dev/null
@@ -1,17 +0,0 @@
-// Copyright 2018 The containerd Authors.
-// Copyright 2019 The gVisor Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-// Package shim contains the core containerd shim implementation.
-package shim
diff --git a/pkg/shim/v2/v2_state_autogen.go b/pkg/shim/v2/v2_state_autogen.go
deleted file mode 100644
index 1023f4d8f..000000000
--- a/pkg/shim/v2/v2_state_autogen.go
+++ /dev/null
@@ -1,5 +0,0 @@
-// automatically generated by stateify.
-
-// +build linux
-
-package v2