Update shim to build using bazel.

The go.mod dependency tree for the shim was somehow contradictory. After
resolving these issues (e.g. explicitly imported k8s 1.14, pulling a
specific dbus version), and adding all dependencies, the shim can now be
build as part of the regular bazel tree.

As part of this process, minor cleanup was done in all the source files:
headers were standardized (and include "The gVisor Authors" in addition
to the "The containerd Authors" if originally derived from containerd
sources), and comments were cleaned up to meet coding standards.

This change makes the containerd installation dynamic, so that multiple
versions can be tested, and drops the static installer for the VM image
itself.

This change also updates test/root/crictl_test.go and related utilities,
so that the containerd tests can be run on any version (and in cases
where it applies, they can be run on both v1 and v2 as parameterized
tests).

22 files changed, 404 insertions, 236 deletions

diff --git a/pkg/shim/runsc/BUILD b/pkg/shim/runsc/BUILD
new file mode 100644
index 000000000..4d388ca05
--- /dev/null
+++ b/pkg/shim/runsc/BUILD
@@ -0,0 +1,16 @@
+load("//tools:defs.bzl", "go_library")
+
+package(licenses = ["notice"])
+
+go_library(
+    name = "runsc",
+    srcs = [
+        "runsc.go",
+        "utils.go",
+    ],
+    visibility = ["//:sandbox"],
+    deps = [
+        "@com_github_containerd_go_runc//:go_default_library",
+        "@com_github_opencontainers_runtime-spec//specs-go:go_default_library",
+    ],
+)
diff --git a/pkg/shim/runsc/runsc.go b/pkg/shim/runsc/runsc.go
index 41ba9c3af..50807d0c5 100644
--- a/pkg/shim/runsc/runsc.go
+++ b/pkg/shim/runsc/runsc.go
@@ -34,10 +34,10 @@ import (
 
 var Monitor runc.ProcessMonitor = runc.Monitor
 
-// DefaultCommand is the default command for Runsc
+// DefaultCommand is the default command for Runsc.
 const DefaultCommand = "runsc"
 
-// Runsc is the client to the runsc cli
+// Runsc is the client to the runsc cli.
 type Runsc struct {
 	Command      string
 	PdeathSignal syscall.Signal
@@ -48,7 +48,7 @@ type Runsc struct {
 	Config       map[string]string
 }
 
-// List returns all containers created inside the provided runsc root directory
+// List returns all containers created inside the provided runsc root directory.
 func (r *Runsc) List(context context.Context) ([]*runc.Container, error) {
 	data, err := cmdOutput(r.command(context, "list", "--format=json"), false)
 	if err != nil {
@@ -61,7 +61,7 @@ func (r *Runsc) List(context context.Context) ([]*runc.Container, error) {
 	return out, nil
 }
 
-// State returns the state for the container provided by id
+// State returns the state for the container provided by id.
 func (r *Runsc) State(context context.Context, id string) (*runc.Container, error) {
 	data, err := cmdOutput(r.command(context, "state", id), true)
 	if err != nil {
@@ -76,9 +76,11 @@ func (r *Runsc) State(context context.Context, id string) (*runc.Container, erro
 
 type CreateOpts struct {
 	runc.IO
-	// PidFile is a path to where a pid file should be created
-	PidFile       string
 	ConsoleSocket runc.ConsoleSocket
+
+	// PidFile is a path to where a pid file should be created.
+	PidFile string
+
 	// UserLog is a path to where runsc user log should be generated.
 	UserLog string
 }
@@ -100,7 +102,7 @@ func (o *CreateOpts) args() (out []string, err error) {
 	return out, nil
 }
 
-// Create creates a new container and returns its pid if it was created successfully
+// Create creates a new container and returns its pid if it was created successfully.
 func (r *Runsc) Create(context context.Context, id, bundle string, opts *CreateOpts) error {
 	args := []string{"create", "--bundle", bundle}
 	if opts != nil {
@@ -141,7 +143,7 @@ func (r *Runsc) Create(context context.Context, id, bundle string, opts *CreateO
 	return err
 }
 
-// Start will start an already created container
+// Start will start an already created container.
 func (r *Runsc) Start(context context.Context, id string, cio runc.IO) error {
 	cmd := r.command(context, "start", id)
 	if cio != nil {
@@ -181,6 +183,7 @@ type waitResult struct {
 }
 
 // Wait will wait for a running container, and return its exit status.
+//
 // TODO(random-liu): Add exec process support.
 func (r *Runsc) Wait(context context.Context, id string) (int, error) {
 	data, err := cmdOutput(r.command(context, "wait", id), true)
@@ -226,8 +229,8 @@ func (o *ExecOpts) args() (out []string, err error) {
 	return out, nil
 }
 
-// Exec executres and additional process inside the container based on a full
-// OCI Process specification
+// Exec executes an additional process inside the container based on a full OCI
+// Process specification.
 func (r *Runsc) Exec(context context.Context, id string, spec specs.Process, opts *ExecOpts) error {
 	f, err := ioutil.TempFile(os.Getenv("XDG_RUNTIME_DIR"), "runsc-process")
 	if err != nil {
@@ -276,8 +279,8 @@ func (r *Runsc) Exec(context context.Context, id string, spec specs.Process, opt
 	return err
 }
 
-// Run runs the create, start, delete lifecycle of the container
-// and returns its exit status after it has exited
+// Run runs the create, start, delete lifecycle of the container and returns
+// its exit status after it has exited.
 func (r *Runsc) Run(context context.Context, id, bundle string, opts *CreateOpts) (int, error) {
 	args := []string{"run", "--bundle", bundle}
 	if opts != nil {
@@ -309,7 +312,7 @@ func (o *DeleteOpts) args() (out []string) {
 	return out
 }
 
-// Delete deletes the container
+// Delete deletes the container.
 func (r *Runsc) Delete(context context.Context, id string, opts *DeleteOpts) error {
 	args := []string{"delete"}
 	if opts != nil {
@@ -318,7 +321,7 @@ func (r *Runsc) Delete(context context.Context, id string, opts *DeleteOpts) err
 	return r.runOrError(r.command(context, append(args, id)...))
 }
 
-// KillOpts specifies options for killing a container and its processes
+// KillOpts specifies options for killing a container and its processes.
 type KillOpts struct {
 	All bool
 	Pid int
@@ -334,7 +337,7 @@ func (o *KillOpts) args() (out []string) {
 	return out
 }
 
-// Kill sends the specified signal to the container
+// Kill sends the specified signal to the container.
 func (r *Runsc) Kill(context context.Context, id string, sig int, opts *KillOpts) error {
 	args := []string{
 		"kill",
@@ -345,7 +348,7 @@ func (r *Runsc) Kill(context context.Context, id string, sig int, opts *KillOpts
 	return r.runOrError(r.command(context, append(args, id, strconv.Itoa(sig))...))
 }
 
-// Stats return the stats for a container like cpu, memory, and io
+// Stats return the stats for a container like cpu, memory, and I/O.
 func (r *Runsc) Stats(context context.Context, id string) (*runc.Stats, error) {
 	cmd := r.command(context, "events", "--stats", id)
 	rd, err := cmd.StdoutPipe()
@@ -367,7 +370,7 @@ func (r *Runsc) Stats(context context.Context, id string) (*runc.Stats, error) {
 	return e.Stats, nil
 }
 
-// Events returns an event stream from runsc for a container with stats and OOM notifications
+// Events returns an event stream from runsc for a container with stats and OOM notifications.
 func (r *Runsc) Events(context context.Context, id string, interval time.Duration) (chan *runc.Event, error) {
 	cmd := r.command(context, "events", fmt.Sprintf("--interval=%ds", int(interval.Seconds())), id)
 	rd, err := cmd.StdoutPipe()
@@ -406,7 +409,7 @@ func (r *Runsc) Events(context context.Context, id string, interval time.Duratio
 	return c, nil
 }
 
-// Ps lists all the processes inside the container returning their pids
+// Ps lists all the processes inside the container returning their pids.
 func (r *Runsc) Ps(context context.Context, id string) ([]int, error) {
 	data, err := cmdOutput(r.command(context, "ps", "--format", "json", id), true)
 	if err != nil {
@@ -419,7 +422,7 @@ func (r *Runsc) Ps(context context.Context, id string) ([]int, error) {
 	return pids, nil
 }
 
-// Top lists all the processes inside the container returning the full ps data
+// Top lists all the processes inside the container returning the full ps data.
 func (r *Runsc) Top(context context.Context, id string) (*runc.TopResults, error) {
 	data, err := cmdOutput(r.command(context, "ps", "--format", "table", id), true)
 	if err != nil {
@@ -450,10 +453,10 @@ func (r *Runsc) args() []string {
 	return args
 }
 
-// runOrError will run the provided command.  If an error is
-// encountered and neither Stdout or Stderr was set the error and the
-// stderr of the command will be returned in the format of <error>:
-// <stderr>
+// runOrError will run the provided command.
+//
+// If an error is encountered and neither Stdout or Stderr was set the error
+// will be returned in the format of <error>: <stderr>.
 func (r *Runsc) runOrError(cmd *exec.Cmd) error {
 	if cmd.Stdout != nil || cmd.Stderr != nil {
 		ec, err := Monitor.Start(cmd)
diff --git a/pkg/shim/v1/proc/BUILD b/pkg/shim/v1/proc/BUILD
new file mode 100644
index 000000000..a59bf198d
--- /dev/null
+++ b/pkg/shim/v1/proc/BUILD
@@ -0,0 +1,35 @@
+load("//tools:defs.bzl", "go_library")
+
+package(licenses = ["notice"])
+
+go_library(
+    name = "proc",
+    srcs = [
+        "deleted_state.go",
+        "exec.go",
+        "exec_state.go",
+        "init.go",
+        "init_state.go",
+        "io.go",
+        "process.go",
+        "types.go",
+        "utils.go",
+    ],
+    visibility = [
+        "//pkg/shim:__subpackages__",
+        "//shim:__subpackages__",
+    ],
+    deps = [
+        "//pkg/shim/runsc",
+        "@com_github_containerd_console//:go_default_library",
+        "@com_github_containerd_containerd//errdefs:go_default_library",
+        "@com_github_containerd_containerd//log:go_default_library",
+        "@com_github_containerd_containerd//mount:go_default_library",
+        "@com_github_containerd_containerd//runtime/proc:go_default_library",
+        "@com_github_containerd_fifo//:go_default_library",
+        "@com_github_containerd_go_runc//:go_default_library",
+        "@com_github_gogo_protobuf//types:go_default_library",
+        "@com_github_opencontainers_runtime-spec//specs-go:go_default_library",
+        "@org_golang_x_sys//unix:go_default_library",
+    ],
+)
diff --git a/pkg/shim/v1/proc/deleted_state.go b/pkg/shim/v1/proc/deleted_state.go
index 0196c96dd..52aad40ac 100644
--- a/pkg/shim/v1/proc/deleted_state.go
+++ b/pkg/shim/v1/proc/deleted_state.go
@@ -17,33 +17,33 @@ package proc
 
 import (
 	"context"
+	"fmt"
 
 	"github.com/containerd/console"
 	"github.com/containerd/containerd/errdefs"
 	"github.com/containerd/containerd/runtime/proc"
-	"github.com/pkg/errors"
 )
 
 type deletedState struct{}
 
 func (*deletedState) Resize(ws console.WinSize) error {
-	return errors.Errorf("cannot resize a deleted process")
+	return fmt.Errorf("cannot resize a deleted process")
 }
 
 func (*deletedState) Start(ctx context.Context) error {
-	return errors.Errorf("cannot start a deleted process")
+	return fmt.Errorf("cannot start a deleted process")
 }
 
 func (*deletedState) Delete(ctx context.Context) error {
-	return errors.Wrap(errdefs.ErrNotFound, "cannot delete a deleted process")
+	return fmt.Errorf("cannot delete a deleted process: %w", errdefs.ErrNotFound)
 }
 
 func (*deletedState) Kill(ctx context.Context, sig uint32, all bool) error {
-	return errors.Wrap(errdefs.ErrNotFound, "cannot kill a deleted process")
+	return fmt.Errorf("cannot kill a deleted process: %w", errdefs.ErrNotFound)
 }
 
 func (*deletedState) SetExited(status int) {}
 
 func (*deletedState) Exec(ctx context.Context, path string, r *ExecConfig) (proc.Process, error) {
-	return nil, errors.Errorf("cannot exec in a deleted state")
+	return nil, fmt.Errorf("cannot exec in a deleted state")
 }
diff --git a/pkg/shim/v1/proc/exec.go b/pkg/shim/v1/proc/exec.go
index 6821e09cd..4ef9cf6cf 100644
--- a/pkg/shim/v1/proc/exec.go
+++ b/pkg/shim/v1/proc/exec.go
@@ -31,7 +31,6 @@ import (
 	"github.com/containerd/fifo"
 	runc "github.com/containerd/go-runc"
 	specs "github.com/opencontainers/runtime-spec/specs-go"
-	"github.com/pkg/errors"
 	"golang.org/x/sys/unix"
 
 	"gvisor.dev/gvisor/pkg/shim/runsc"
@@ -151,9 +150,11 @@ func (e *execProcess) kill(ctx context.Context, sig uint32, _ bool) error {
 		if err := e.parent.runtime.Kill(ctx, e.parent.id, int(sig), &runsc.KillOpts{
 			Pid: internalPid,
 		}); err != nil {
-			// If this returns error, consider the process has already stopped.
+			// If this returns error, consider the process has
+			// already stopped.
+			//
 			// TODO: Fix after signal handling is fixed.
-			return errors.Wrapf(errdefs.ErrNotFound, err.Error())
+			return fmt.Errorf("%s: %w", err.Error(), errdefs.ErrNotFound)
 		}
 	}
 	return nil
@@ -182,16 +183,16 @@ func (e *execProcess) start(ctx context.Context) (err error) {
 	)
 	if e.stdio.Terminal {
 		if socket, err = runc.NewTempConsoleSocket(); err != nil {
-			return errors.Wrap(err, "failed to create runc console socket")
+			return fmt.Errorf("failed to create runc console socket: %w", err)
 		}
 		defer socket.Close()
 	} else if e.stdio.IsNull() {
 		if e.io, err = runc.NewNullIO(); err != nil {
-			return errors.Wrap(err, "creating new NULL IO")
+			return fmt.Errorf("creating new NULL IO: %w", err)
 		}
 	} else {
 		if e.io, err = runc.NewPipeIO(e.parent.IoUID, e.parent.IoGID, withConditionalIO(e.stdio)); err != nil {
-			return errors.Wrap(err, "failed to create runc io pipes")
+			return fmt.Errorf("failed to create runc io pipes: %w", err)
 		}
 	}
 	opts := &runsc.ExecOpts{
@@ -217,7 +218,7 @@ func (e *execProcess) start(ctx context.Context) (err error) {
 	if e.stdio.Stdin != "" {
 		sc, err := fifo.OpenFifo(context.Background(), e.stdio.Stdin, syscall.O_WRONLY|syscall.O_NONBLOCK, 0)
 		if err != nil {
-			return errors.Wrapf(err, "failed to open stdin fifo %s", e.stdio.Stdin)
+			return fmt.Errorf("failed to open stdin fifo %s: %w", e.stdio.Stdin, err)
 		}
 		e.closers = append(e.closers, sc)
 		e.stdin = sc
@@ -228,25 +229,25 @@ func (e *execProcess) start(ctx context.Context) (err error) {
 	if socket != nil {
 		console, err := socket.ReceiveMaster()
 		if err != nil {
-			return errors.Wrap(err, "failed to retrieve console master")
+			return fmt.Errorf("failed to retrieve console master: %w", err)
 		}
 		if e.console, err = e.parent.Platform.CopyConsole(ctx, console, e.stdio.Stdin, e.stdio.Stdout, e.stdio.Stderr, &e.wg, &copyWaitGroup); err != nil {
-			return errors.Wrap(err, "failed to start console copy")
+			return fmt.Errorf("failed to start console copy: %w", err)
 		}
 	} else if !e.stdio.IsNull() {
 		if err := copyPipes(ctx, e.io, e.stdio.Stdin, e.stdio.Stdout, e.stdio.Stderr, &e.wg, &copyWaitGroup); err != nil {
-			return errors.Wrap(err, "failed to start io pipe copy")
+			return fmt.Errorf("failed to start io pipe copy: %w", err)
 		}
 	}
 	copyWaitGroup.Wait()
 	pid, err := runc.ReadPidFile(opts.PidFile)
 	if err != nil {
-		return errors.Wrap(err, "failed to retrieve OCI runtime exec pid")
+		return fmt.Errorf("failed to retrieve OCI runtime exec pid: %w", err)
 	}
 	e.pid = pid
 	internalPid, err := runc.ReadPidFile(opts.InternalPidFile)
 	if err != nil {
-		return errors.Wrap(err, "failed to retrieve OCI runtime exec internal pid")
+		return fmt.Errorf("failed to retrieve OCI runtime exec internal pid: %w", err)
 	}
 	e.internalPid = internalPid
 	go func() {
diff --git a/pkg/shim/v1/proc/exec_state.go b/pkg/shim/v1/proc/exec_state.go
index 5416cb601..4dcda8b44 100644
--- a/pkg/shim/v1/proc/exec_state.go
+++ b/pkg/shim/v1/proc/exec_state.go
@@ -17,9 +17,9 @@ package proc
 
 import (
 	"context"
+	"fmt"
 
 	"github.com/containerd/console"
-	"github.com/pkg/errors"
 )
 
 type execState interface {
@@ -43,7 +43,7 @@ func (s *execCreatedState) transition(name string) error {
 	case "deleted":
 		s.p.execState = &deletedState{}
 	default:
-		return errors.Errorf("invalid state transition %q to %q", stateName(s), name)
+		return fmt.Errorf("invalid state transition %q to %q", stateName(s), name)
 	}
 	return nil
 }
@@ -87,7 +87,7 @@ func (s *execRunningState) transition(name string) error {
 	case "stopped":
 		s.p.execState = &execStoppedState{p: s.p}
 	default:
-		return errors.Errorf("invalid state transition %q to %q", stateName(s), name)
+		return fmt.Errorf("invalid state transition %q to %q", stateName(s), name)
 	}
 	return nil
 }
@@ -97,11 +97,11 @@ func (s *execRunningState) Resize(ws console.WinSize) error {
 }
 
 func (s *execRunningState) Start(ctx context.Context) error {
-	return errors.Errorf("cannot start a running process")
+	return fmt.Errorf("cannot start a running process")
 }
 
 func (s *execRunningState) Delete(ctx context.Context) error {
-	return errors.Errorf("cannot delete a running process")
+	return fmt.Errorf("cannot delete a running process")
 }
 
 func (s *execRunningState) Kill(ctx context.Context, sig uint32, all bool) error {
@@ -125,17 +125,17 @@ func (s *execStoppedState) transition(name string) error {
 	case "deleted":
 		s.p.execState = &deletedState{}
 	default:
-		return errors.Errorf("invalid state transition %q to %q", stateName(s), name)
+		return fmt.Errorf("invalid state transition %q to %q", stateName(s), name)
 	}
 	return nil
 }
 
 func (s *execStoppedState) Resize(ws console.WinSize) error {
-	return errors.Errorf("cannot resize a stopped container")
+	return fmt.Errorf("cannot resize a stopped container")
 }
 
 func (s *execStoppedState) Start(ctx context.Context) error {
-	return errors.Errorf("cannot start a stopped process")
+	return fmt.Errorf("cannot start a stopped process")
 }
 
 func (s *execStoppedState) Delete(ctx context.Context) error {
diff --git a/pkg/shim/v1/proc/init.go b/pkg/shim/v1/proc/init.go
index 0771540a9..b429cb94f 100644
--- a/pkg/shim/v1/proc/init.go
+++ b/pkg/shim/v1/proc/init.go
@@ -18,6 +18,7 @@ package proc
 import (
 	"context"
 	"encoding/json"
+	"fmt"
 	"io"
 	"path/filepath"
 	"strings"
@@ -33,23 +34,22 @@ import (
 	"github.com/containerd/fifo"
 	runc "github.com/containerd/go-runc"
 	specs "github.com/opencontainers/runtime-spec/specs-go"
-	"github.com/pkg/errors"
 
 	"gvisor.dev/gvisor/pkg/shim/runsc"
 )
 
-// InitPidFile name of the file that contains the init pid
+// InitPidFile name of the file that contains the init pid.
 const InitPidFile = "init.pid"
 
-// Init represents an initial process for a container
+// Init represents an initial process for a container.
 type Init struct {
 	wg        sync.WaitGroup
 	initState initState
 
 	// mu is used to ensure that `Start()` and `Exited()` calls return in
-	// the right order when invoked in separate go routines.
-	// This is the case within the shim implementation as it makes use of
-	// the reaper interface.
+	// the right order when invoked in separate go routines.  This is the
+	// case within the shim implementation as it makes use of the reaper
+	// interface.
 	mu sync.Mutex
 
 	waitBlock chan struct{}
@@ -76,7 +76,7 @@ type Init struct {
 	Monitor  ProcessMonitor
 }
 
-// NewRunsc returns a new runsc instance for a process
+// NewRunsc returns a new runsc instance for a process.
 func NewRunsc(root, path, namespace, runtime string, config map[string]string) *runsc.Runsc {
 	if root == "" {
 		root = RunscRoot
@@ -91,7 +91,7 @@ func NewRunsc(root, path, namespace, runtime string, config map[string]string) *
 	}
 }
 
-// New returns a new init process
+// New returns a new init process.
 func New(id string, runtime *runsc.Runsc, stdio proc.Stdio) *Init {
 	p := &Init{
 		id:        id,
@@ -104,21 +104,21 @@ func New(id string, runtime *runsc.Runsc, stdio proc.Stdio) *Init {
 	return p
 }
 
-// Create the process with the provided config
+// Create the process with the provided config.
 func (p *Init) Create(ctx context.Context, r *CreateConfig) (err error) {
 	var socket *runc.Socket
 	if r.Terminal {
 		if socket, err = runc.NewTempConsoleSocket(); err != nil {
-			return errors.Wrap(err, "failed to create OCI runtime console socket")
+			return fmt.Errorf("failed to create OCI runtime console socket: %w", err)
 		}
 		defer socket.Close()
 	} else if hasNoIO(r) {
 		if p.io, err = runc.NewNullIO(); err != nil {
-			return errors.Wrap(err, "creating new NULL IO")
+			return fmt.Errorf("creating new NULL IO: %w", err)
 		}
 	} else {
 		if p.io, err = runc.NewPipeIO(p.IoUID, p.IoGID, withConditionalIO(p.stdio)); err != nil {
-			return errors.Wrap(err, "failed to create OCI runtime io pipes")
+			return fmt.Errorf("failed to create OCI runtime io pipes: %w", err)
 		}
 	}
 	pidFile := filepath.Join(p.Bundle, InitPidFile)
@@ -139,7 +139,7 @@ func (p *Init) Create(ctx context.Context, r *CreateConfig) (err error) {
 	if r.Stdin != "" {
 		sc, err := fifo.OpenFifo(context.Background(), r.Stdin, syscall.O_WRONLY|syscall.O_NONBLOCK, 0)
 		if err != nil {
-			return errors.Wrapf(err, "failed to open stdin fifo %s", r.Stdin)
+			return fmt.Errorf("failed to open stdin fifo %s: %w", r.Stdin, err)
 		}
 		p.stdin = sc
 		p.closers = append(p.closers, sc)
@@ -150,58 +150,58 @@ func (p *Init) Create(ctx context.Context, r *CreateConfig) (err error) {
 	if socket != nil {
 		console, err := socket.ReceiveMaster()
 		if err != nil {
-			return errors.Wrap(err, "failed to retrieve console master")
+			return fmt.Errorf("failed to retrieve console master: %w", err)
 		}
 		console, err = p.Platform.CopyConsole(ctx, console, r.Stdin, r.Stdout, r.Stderr, &p.wg, &copyWaitGroup)
 		if err != nil {
-			return errors.Wrap(err, "failed to start console copy")
+			return fmt.Errorf("failed to start console copy: %w", err)
 		}
 		p.console = console
 	} else if !hasNoIO(r) {
 		if err := copyPipes(ctx, p.io, r.Stdin, r.Stdout, r.Stderr, &p.wg, &copyWaitGroup); err != nil {
-			return errors.Wrap(err, "failed to start io pipe copy")
+			return fmt.Errorf("failed to start io pipe copy: %w", err)
 		}
 	}
 
 	copyWaitGroup.Wait()
 	pid, err := runc.ReadPidFile(pidFile)
 	if err != nil {
-		return errors.Wrap(err, "failed to retrieve OCI runtime container pid")
+		return fmt.Errorf("failed to retrieve OCI runtime container pid: %w", err)
 	}
 	p.pid = pid
 	return nil
 }
 
-// Wait for the process to exit
+// Wait waits for the process to exit.
 func (p *Init) Wait() {
 	<-p.waitBlock
 }
 
-// ID of the process
+// ID returns the ID of the process.
 func (p *Init) ID() string {
 	return p.id
 }
 
-// Pid of the process
+// Pid returns the PID of the process.
 func (p *Init) Pid() int {
 	return p.pid
 }
 
-// ExitStatus of the process
+// ExitStatus returns the exit status of the process.
 func (p *Init) ExitStatus() int {
 	p.mu.Lock()
 	defer p.mu.Unlock()
 	return p.status
 }
 
-// ExitedAt at time when the process exited
+// ExitedAt returns the time when the process exited.
 func (p *Init) ExitedAt() time.Time {
 	p.mu.Lock()
 	defer p.mu.Unlock()
 	return p.exited
 }
 
-// Status of the process
+// Status returns the status of the process.
 func (p *Init) Status(ctx context.Context) (string, error) {
 	p.mu.Lock()
 	defer p.mu.Unlock()
@@ -215,7 +215,7 @@ func (p *Init) Status(ctx context.Context) (string, error) {
 	return p.convertStatus(c.Status), nil
 }
 
-// Start the init process
+// Start starts the init process.
 func (p *Init) Start(ctx context.Context) error {
 	p.mu.Lock()
 	defer p.mu.Unlock()
@@ -250,7 +250,7 @@ func (p *Init) start(ctx context.Context) error {
 	return nil
 }
 
-// SetExited of the init process with the next status
+// SetExited set the exit stauts of the init process.
 func (p *Init) SetExited(status int) {
 	p.mu.Lock()
 	defer p.mu.Unlock()
@@ -265,7 +265,7 @@ func (p *Init) setExited(status int) {
 	close(p.waitBlock)
 }
 
-// Delete the init process
+// Delete deletes the init process.
 func (p *Init) Delete(ctx context.Context) error {
 	p.mu.Lock()
 	defer p.mu.Unlock()
@@ -298,13 +298,13 @@ func (p *Init) delete(ctx context.Context) error {
 	if err2 := mount.UnmountAll(p.Rootfs, 0); err2 != nil {
 		log.G(ctx).WithError(err2).Warn("failed to cleanup rootfs mount")
 		if err == nil {
-			err = errors.Wrap(err2, "failed rootfs umount")
+			err = fmt.Errorf("failed rootfs umount: %w", err2)
 		}
 	}
 	return err
 }
 
-// Resize the init processes console
+// Resize resizes the init processes console.
 func (p *Init) Resize(ws console.WinSize) error {
 	p.mu.Lock()
 	defer p.mu.Unlock()
@@ -322,7 +322,7 @@ func (p *Init) resize(ws console.WinSize) error {
 	return p.console.Resize(ws)
 }
 
-// Kill the init process
+// Kill kills the init process.
 func (p *Init) Kill(ctx context.Context, signal uint32, all bool) error {
 	p.mu.Lock()
 	defer p.mu.Unlock()
@@ -340,7 +340,7 @@ func (p *Init) kill(context context.Context, signal uint32, all bool) error {
 		c, err := p.runtime.State(context, p.id)
 		if err != nil {
 			if strings.Contains(err.Error(), "does not exist") {
-				return errors.Wrapf(errdefs.ErrNotFound, "no such process")
+				return fmt.Errorf("no such process: %w", errdefs.ErrNotFound)
 			}
 			return p.runtimeError(err, "OCI runtime state failed")
 		}
@@ -348,7 +348,7 @@ func (p *Init) kill(context context.Context, signal uint32, all bool) error {
 		// If the container is not in running state, directly return
 		// "no such process"
 		if p.convertStatus(c.Status) == "stopped" {
-			return errors.Wrapf(errdefs.ErrNotFound, "no such process")
+			return fmt.Errorf("no such process: %w", errdefs.ErrNotFound)
 		}
 		killErr = p.runtime.Kill(context, p.id, int(signal), &runsc.KillOpts{
 			All: all,
@@ -362,7 +362,7 @@ func (p *Init) kill(context context.Context, signal uint32, all bool) error {
 	return p.runtimeError(killErr, "kill timeout")
 }
 
-// KillAll processes belonging to the init process
+// KillAll kills all processes belonging to the init process.
 func (p *Init) KillAll(context context.Context) error {
 	p.mu.Lock()
 	defer p.mu.Unlock()
@@ -380,17 +380,17 @@ func (p *Init) killAll(context context.Context) error {
 	return nil
 }
 
-// Stdin of the process
+// Stdin returns the stdin of the process.
 func (p *Init) Stdin() io.Closer {
 	return p.stdin
 }
 
-// Runtime returns the OCI runtime configured for the init process
+// Runtime returns the OCI runtime configured for the init process.
 func (p *Init) Runtime() *runsc.Runsc {
 	return p.runtime
 }
 
-// Exec returns a new child process
+// Exec returns a new child process.
 func (p *Init) Exec(ctx context.Context, path string, r *ExecConfig) (proc.Process, error) {
 	p.mu.Lock()
 	defer p.mu.Unlock()
@@ -398,7 +398,7 @@ func (p *Init) Exec(ctx context.Context, path string, r *ExecConfig) (proc.Proce
 	return p.initState.Exec(ctx, path, r)
 }
 
-// exec returns a new exec'd process
+// exec returns a new exec'd process.
 func (p *Init) exec(ctx context.Context, path string, r *ExecConfig) (proc.Process, error) {
 	// process exec request
 	var spec specs.Process
@@ -424,7 +424,7 @@ func (p *Init) exec(ctx context.Context, path string, r *ExecConfig) (proc.Proce
 	return e, nil
 }
 
-// Stdio of the process
+// Stdio returns the stdio of the process.
 func (p *Init) Stdio() proc.Stdio {
 	return p.stdio
 }
@@ -437,11 +437,11 @@ func (p *Init) runtimeError(rErr error, msg string) error {
 	rMsg, err := getLastRuntimeError(p.runtime)
 	switch {
 	case err != nil:
-		return errors.Wrapf(rErr, "%s: %s (%s)", msg, "unable to retrieve OCI runtime error", err.Error())
+		return fmt.Errorf("%s: %w (unable to retrieve OCI runtime error: %v)", msg, rErr, err)
 	case rMsg == "":
-		return errors.Wrap(rErr, msg)
+		return fmt.Errorf("%s: %w", msg, rErr)
 	default:
-		return errors.Errorf("%s: %s", msg, rMsg)
+		return fmt.Errorf("%s: %s", msg, rMsg)
 	}
 }
 
diff --git a/pkg/shim/v1/proc/init_state.go b/pkg/shim/v1/proc/init_state.go
index 868646b6c..509f27762 100644
--- a/pkg/shim/v1/proc/init_state.go
+++ b/pkg/shim/v1/proc/init_state.go
@@ -17,11 +17,11 @@ package proc
 
 import (
 	"context"
+	"fmt"
 
 	"github.com/containerd/console"
 	"github.com/containerd/containerd/errdefs"
 	"github.com/containerd/containerd/runtime/proc"
-	"github.com/pkg/errors"
 )
 
 type initState interface {
@@ -46,7 +46,7 @@ func (s *createdState) transition(name string) error {
 	case "deleted":
 		s.p.initState = &deletedState{}
 	default:
-		return errors.Errorf("invalid state transition %q to %q", stateName(s), name)
+		return fmt.Errorf("invalid state transition %q to %q", stateName(s), name)
 	}
 	return nil
 }
@@ -107,7 +107,7 @@ func (s *runningState) transition(name string) error {
 	case "stopped":
 		s.p.initState = &stoppedState{p: s.p}
 	default:
-		return errors.Errorf("invalid state transition %q to %q", stateName(s), name)
+		return fmt.Errorf("invalid state transition %q to %q", stateName(s), name)
 	}
 	return nil
 }
@@ -117,11 +117,11 @@ func (s *runningState) Resize(ws console.WinSize) error {
 }
 
 func (s *runningState) Start(ctx context.Context) error {
-	return errors.Errorf("cannot start a running process")
+	return fmt.Errorf("cannot start a running process")
 }
 
 func (s *runningState) Delete(ctx context.Context) error {
-	return errors.Errorf("cannot delete a running process")
+	return fmt.Errorf("cannot delete a running process")
 }
 
 func (s *runningState) Kill(ctx context.Context, sig uint32, all bool) error {
@@ -149,17 +149,17 @@ func (s *stoppedState) transition(name string) error {
 	case "deleted":
 		s.p.initState = &deletedState{}
 	default:
-		return errors.Errorf("invalid state transition %q to %q", stateName(s), name)
+		return fmt.Errorf("invalid state transition %q to %q", stateName(s), name)
 	}
 	return nil
 }
 
 func (s *stoppedState) Resize(ws console.WinSize) error {
-	return errors.Errorf("cannot resize a stopped container")
+	return fmt.Errorf("cannot resize a stopped container")
 }
 
 func (s *stoppedState) Start(ctx context.Context) error {
-	return errors.Errorf("cannot start a stopped process")
+	return fmt.Errorf("cannot start a stopped process")
 }
 
 func (s *stoppedState) Delete(ctx context.Context) error {
@@ -178,5 +178,5 @@ func (s *stoppedState) SetExited(status int) {
 }
 
 func (s *stoppedState) Exec(ctx context.Context, path string, r *ExecConfig) (proc.Process, error) {
-	return nil, errors.Errorf("cannot exec in a stopped state")
+	return nil, fmt.Errorf("cannot exec in a stopped state")
 }
diff --git a/pkg/shim/v1/proc/io.go b/pkg/shim/v1/proc/io.go
index 2677b4e54..5313c7a50 100644
--- a/pkg/shim/v1/proc/io.go
+++ b/pkg/shim/v1/proc/io.go
@@ -150,8 +150,9 @@ func (c *countingWriteCloser) Close() error {
 	return c.WriteCloser.Close()
 }
 
-// isFifo checks if a file is a fifo
-// if the file does not exist then it returns false
+// isFifo checks if a file is a fifo.
+//
+// If the file does not exist then it returns false.
 func isFifo(path string) (bool, error) {
 	stat, err := os.Stat(path)
 	if err != nil {
diff --git a/pkg/shim/v1/proc/process.go b/pkg/shim/v1/proc/process.go
index 1bfa99f4c..d462c3eef 100644
--- a/pkg/shim/v1/proc/process.go
+++ b/pkg/shim/v1/proc/process.go
@@ -16,10 +16,10 @@
 package proc
 
 import (
-	"github.com/pkg/errors"
+	"fmt"
 )
 
-// RunscRoot is the path to the root runsc state directory
+// RunscRoot is the path to the root runsc state directory.
 const RunscRoot = "/run/containerd/runsc"
 
 func stateName(v interface{}) string {
@@ -33,5 +33,5 @@ func stateName(v interface{}) string {
 	case *stoppedState:
 		return "stopped"
 	}
-	panic(errors.Errorf("invalid state %v", v))
+	panic(fmt.Errorf("invalid state %v", v))
 }
diff --git a/pkg/shim/v1/proc/types.go b/pkg/shim/v1/proc/types.go
index dcd43bcca..5c215de5f 100644
--- a/pkg/shim/v1/proc/types.go
+++ b/pkg/shim/v1/proc/types.go
@@ -23,7 +23,7 @@ import (
 	runc "github.com/containerd/go-runc"
 )
 
-// Mount holds filesystem mount configuration
+// Mount holds filesystem mount configuration.
 type Mount struct {
 	Type    string
 	Source  string
@@ -31,7 +31,7 @@ type Mount struct {
 	Options []string
 }
 
-// CreateConfig hold task creation configuration
+// CreateConfig hold task creation configuration.
 type CreateConfig struct {
 	ID       string
 	Bundle   string
@@ -44,7 +44,7 @@ type CreateConfig struct {
 	Options  *google_protobuf.Any
 }
 
-// ExecConfig holds exec creation configuration
+// ExecConfig holds exec creation configuration.
 type ExecConfig struct {
 	ID       string
 	Terminal bool
@@ -54,14 +54,14 @@ type ExecConfig struct {
 	Spec     *google_protobuf.Any
 }
 
-// Exit is the type of exit events
+// Exit is the type of exit events.
 type Exit struct {
 	Timestamp time.Time
 	ID        string
 	Status    int
 }
 
-// ProcessMonitor monitors process exit changes
+// ProcessMonitor monitors process exit changes.
 type ProcessMonitor interface {
 	// Subscribe to process exit changes
 	Subscribe() chan runc.Exit
diff --git a/pkg/shim/v1/proc/utils.go b/pkg/shim/v1/proc/utils.go
index 6e7dbdad7..716de2f59 100644
--- a/pkg/shim/v1/proc/utils.go
+++ b/pkg/shim/v1/proc/utils.go
@@ -34,8 +34,6 @@ const (
 // inside the sandbox.
 var ExitCh = make(chan Exit, bufferSize)
 
-// TODO(random-liu): This can be a utility.
-
 // TODO(mlaventure): move to runc package?
 func getLastRuntimeError(r *runsc.Runsc) (string, error) {
 	if r.Log == "" {
diff --git a/pkg/shim/v1/shim/BUILD b/pkg/shim/v1/shim/BUILD
new file mode 100644
index 000000000..02cffbb01
--- /dev/null
+++ b/pkg/shim/v1/shim/BUILD
@@ -0,0 +1,38 @@
+load("//tools:defs.bzl", "go_library")
+
+package(licenses = ["notice"])
+
+go_library(
+    name = "shim",
+    srcs = [
+        "platform.go",
+        "service.go",
+    ],
+    visibility = [
+        "//pkg/shim:__subpackages__",
+        "//shim:__subpackages__",
+    ],
+    deps = [
+        "//pkg/shim/runsc",
+        "//pkg/shim/v1/proc",
+        "//pkg/shim/v1/utils",
+        "@com_github_containerd_console//:go_default_library",
+        "@com_github_containerd_containerd//api/events:go_default_library",
+        "@com_github_containerd_containerd//api/types/task:go_default_library",
+        "@com_github_containerd_containerd//errdefs:go_default_library",
+        "@com_github_containerd_containerd//events:go_default_library",
+        "@com_github_containerd_containerd//log:go_default_library",
+        "@com_github_containerd_containerd//mount:go_default_library",
+        "@com_github_containerd_containerd//namespaces:go_default_library",
+        "@com_github_containerd_containerd//runtime:go_default_library",
+        "@com_github_containerd_containerd//runtime/linux/runctypes:go_default_library",
+        "@com_github_containerd_containerd//runtime/proc:go_default_library",
+        "@com_github_containerd_containerd//runtime/v1/shim:go_default_library",
+        "@com_github_containerd_containerd//runtime/v1/shim/v1:go_default_library",
+        "@com_github_containerd_fifo//:go_default_library",
+        "@com_github_containerd_typeurl//:go_default_library",
+        "@com_github_gogo_protobuf//types:go_default_library",
+        "@org_golang_google_grpc//codes:go_default_library",
+        "@org_golang_google_grpc//status:go_default_library",
+    ],
+)
diff --git a/pkg/shim/v1/shim/platform.go b/pkg/shim/v1/shim/platform.go
index 86252c3f5..f6795563c 100644
--- a/pkg/shim/v1/shim/platform.go
+++ b/pkg/shim/v1/shim/platform.go
@@ -17,13 +17,13 @@ package shim
 
 import (
 	"context"
+	"fmt"
 	"io"
 	"sync"
 	"syscall"
 
 	"github.com/containerd/console"
 	"github.com/containerd/fifo"
-	"github.com/pkg/errors"
 )
 
 type linuxPlatform struct {
@@ -32,7 +32,7 @@ type linuxPlatform struct {
 
 func (p *linuxPlatform) CopyConsole(ctx context.Context, console console.Console, stdin, stdout, stderr string, wg, cwg *sync.WaitGroup) (console.Console, error) {
 	if p.epoller == nil {
-		return nil, errors.New("uninitialized epoller")
+		return nil, fmt.Errorf("uninitialized epoller")
 	}
 
 	epollConsole, err := p.epoller.Add(console)
@@ -79,11 +79,11 @@ func (p *linuxPlatform) CopyConsole(ctx context.Context, console console.Console
 
 func (p *linuxPlatform) ShutdownConsole(ctx context.Context, cons console.Console) error {
 	if p.epoller == nil {
-		return errors.New("uninitialized epoller")
+		return fmt.Errorf("uninitialized epoller")
 	}
 	epollConsole, ok := cons.(*console.EpollConsole)
 	if !ok {
-		return errors.Errorf("expected EpollConsole, got %#v", cons)
+		return fmt.Errorf("expected EpollConsole, got %#v", cons)
 	}
 	return epollConsole.Shutdown(p.epoller.CloseConsole)
 }
@@ -100,7 +100,7 @@ func (s *Service) initPlatform() error {
 	}
 	epoller, err := console.NewEpoller()
 	if err != nil {
-		return errors.Wrap(err, "failed to initialize epoller")
+		return fmt.Errorf("failed to initialize epoller: %w", err)
 	}
 	s.platform = &linuxPlatform{
 		epoller: epoller,
diff --git a/pkg/shim/v1/shim/service.go b/pkg/shim/v1/shim/service.go
index aac172801..7b0280ed2 100644
--- a/pkg/shim/v1/shim/service.go
+++ b/pkg/shim/v1/shim/service.go
@@ -37,8 +37,6 @@ import (
 	shimapi "github.com/containerd/containerd/runtime/v1/shim/v1"
 	"github.com/containerd/typeurl"
 	ptypes "github.com/gogo/protobuf/types"
-	"github.com/pkg/errors"
-	"github.com/sirupsen/logrus"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/status"
 
@@ -57,7 +55,7 @@ var (
 	}
 )
 
-// Config contains shim specific configuration
+// Config contains shim specific configuration.
 type Config struct {
 	Path        string
 	Namespace   string
@@ -66,17 +64,12 @@ type Config struct {
 	RunscConfig map[string]string
 }
 
-// NewService returns a new shim service that can be used via GRPC
+// 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)
-	ctx = log.WithLogger(ctx, logrus.WithFields(logrus.Fields{
-		"namespace": config.Namespace,
-		"path":      config.Path,
-		"pid":       os.Getpid(),
-	}))
 	s := &Service{
 		config:    config,
 		context:   ctx,
@@ -86,13 +79,13 @@ func NewService(config Config, publisher events.Publisher) (*Service, error) {
 	}
 	go s.processExits()
 	if err := s.initPlatform(); err != nil {
-		return nil, errors.Wrap(err, "failed to initialized platform behavior")
+		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
+// Service is the shim implementation of a remote shim over GRPC.
 type Service struct {
 	mu sync.Mutex
 
@@ -108,7 +101,7 @@ type Service struct {
 	bundle string
 }
 
-// Create a new initial process and container with the underlying OCI runtime
+// Create creates a new initial process and container with the underlying OCI runtime.
 func (s *Service) Create(ctx context.Context, r *shimapi.CreateTaskRequest) (_ *shimapi.CreateTaskResponse, err error) {
 	s.mu.Lock()
 	defer s.mu.Unlock()
@@ -153,7 +146,7 @@ func (s *Service) Create(ctx context.Context, r *shimapi.CreateTaskRequest) (_ *
 			Options: rm.Options,
 		}
 		if err := m.Mount(rootfs); err != nil {
-			return nil, errors.Wrapf(err, "failed to mount rootfs component %v", m)
+			return nil, fmt.Errorf("failed to mount rootfs component %v: %w", m, err)
 		}
 	}
 	process, err := newInit(
@@ -169,7 +162,8 @@ func (s *Service) Create(ctx context.Context, r *shimapi.CreateTaskRequest) (_ *
 	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
+	// Save the main task id and bundle to the shim for additional
+	// requests.
 	s.id = r.ID
 	s.bundle = r.Bundle
 	pid := process.Pid()
@@ -179,7 +173,7 @@ func (s *Service) Create(ctx context.Context, r *shimapi.CreateTaskRequest) (_ *
 	}, nil
 }
 
-// Start a process
+// Start starts a process.
 func (s *Service) Start(ctx context.Context, r *shimapi.StartRequest) (*shimapi.StartResponse, error) {
 	p, err := s.getExecProcess(r.ID)
 	if err != nil {
@@ -194,7 +188,7 @@ func (s *Service) Start(ctx context.Context, r *shimapi.StartRequest) (*shimapi.
 	}, nil
 }
 
-// Delete the initial process and container
+// Delete deletes the initial process and container.
 func (s *Service) Delete(ctx context.Context, r *ptypes.Empty) (*shimapi.DeleteResponse, error) {
 	p, err := s.getInitProcess()
 	if err != nil {
@@ -214,7 +208,7 @@ func (s *Service) Delete(ctx context.Context, r *ptypes.Empty) (*shimapi.DeleteR
 	}, nil
 }
 
-// DeleteProcess deletes an exec'd process
+// DeleteProcess deletes an exec'd process.
 func (s *Service) DeleteProcess(ctx context.Context, r *shimapi.DeleteProcessRequest) (*shimapi.DeleteResponse, error) {
 	if r.ID == s.id {
 		return nil, status.Errorf(codes.InvalidArgument, "cannot delete init process with DeleteProcess")
@@ -236,7 +230,7 @@ func (s *Service) DeleteProcess(ctx context.Context, r *shimapi.DeleteProcessReq
 	}, nil
 }
 
-// Exec an additional process inside the container
+// Exec spawns an additional process inside the container.
 func (s *Service) Exec(ctx context.Context, r *shimapi.ExecProcessRequest) (*ptypes.Empty, error) {
 	s.mu.Lock()
 
@@ -268,7 +262,7 @@ func (s *Service) Exec(ctx context.Context, r *shimapi.ExecProcessRequest) (*pty
 	return empty, nil
 }
 
-// ResizePty of a process
+// ResizePty resises the terminal of a process.
 func (s *Service) ResizePty(ctx context.Context, r *shimapi.ResizePtyRequest) (*ptypes.Empty, error) {
 	if r.ID == "" {
 		return nil, errdefs.ToGRPCf(errdefs.ErrInvalidArgument, "id not provided")
@@ -287,7 +281,7 @@ func (s *Service) ResizePty(ctx context.Context, r *shimapi.ResizePtyRequest) (*
 	return empty, nil
 }
 
-// State returns runtime state information for a process
+// State returns runtime state information for a process.
 func (s *Service) State(ctx context.Context, r *shimapi.StateRequest) (*shimapi.StateResponse, error) {
 	p, err := s.getExecProcess(r.ID)
 	if err != nil {
@@ -321,17 +315,17 @@ func (s *Service) State(ctx context.Context, r *shimapi.StateRequest) (*shimapi.
 	}, nil
 }
 
-// Pause the container
+// Pause pauses the container.
 func (s *Service) Pause(ctx context.Context, r *ptypes.Empty) (*ptypes.Empty, error) {
 	return empty, errdefs.ToGRPC(errdefs.ErrNotImplemented)
 }
 
-// Resume the container
+// Resume resumes the container.
 func (s *Service) Resume(ctx context.Context, r *ptypes.Empty) (*ptypes.Empty, error) {
 	return empty, errdefs.ToGRPC(errdefs.ErrNotImplemented)
 }
 
-// Kill a process with the provided signal
+// Kill kills a process with the provided signal.
 func (s *Service) Kill(ctx context.Context, r *shimapi.KillRequest) (*ptypes.Empty, error) {
 	if r.ID == "" {
 		p, err := s.getInitProcess()
@@ -354,7 +348,7 @@ func (s *Service) Kill(ctx context.Context, r *shimapi.KillRequest) (*ptypes.Emp
 	return empty, nil
 }
 
-// ListPids returns all pids inside the container
+// ListPids returns all pids inside the container.
 func (s *Service) ListPids(ctx context.Context, r *shimapi.ListPidsRequest) (*shimapi.ListPidsResponse, error) {
 	pids, err := s.getContainerPids(ctx, r.ID)
 	if err != nil {
@@ -372,7 +366,7 @@ func (s *Service) ListPids(ctx context.Context, r *shimapi.ListPidsRequest) (*sh
 				}
 				a, err := typeurl.MarshalAny(d)
 				if err != nil {
-					return nil, errors.Wrapf(err, "failed to marshal process %d info", pid)
+					return nil, fmt.Errorf("failed to marshal process %d info: %w", pid, err)
 				}
 				pInfo.Info = a
 				break
@@ -385,7 +379,7 @@ func (s *Service) ListPids(ctx context.Context, r *shimapi.ListPidsRequest) (*sh
 	}, nil
 }
 
-// CloseIO of a process
+// CloseIO closes the I/O context of a process.
 func (s *Service) CloseIO(ctx context.Context, r *shimapi.CloseIORequest) (*ptypes.Empty, error) {
 	p, err := s.getExecProcess(r.ID)
 	if err != nil {
@@ -393,30 +387,30 @@ func (s *Service) CloseIO(ctx context.Context, r *shimapi.CloseIORequest) (*ptyp
 	}
 	if stdin := p.Stdin(); stdin != nil {
 		if err := stdin.Close(); err != nil {
-			return nil, errors.Wrap(err, "close stdin")
+			return nil, fmt.Errorf("close stdin: %w", err)
 		}
 	}
 	return empty, nil
 }
 
-// Checkpoint the container
+// Checkpoint checkpoints the container.
 func (s *Service) Checkpoint(ctx context.Context, r *shimapi.CheckpointTaskRequest) (*ptypes.Empty, error) {
 	return empty, errdefs.ToGRPC(errdefs.ErrNotImplemented)
 }
 
-// ShimInfo returns shim information such as the shim's pid
+// ShimInfo returns shim information such as the shim's pid.
 func (s *Service) ShimInfo(ctx context.Context, r *ptypes.Empty) (*shimapi.ShimInfoResponse, error) {
 	return &shimapi.ShimInfoResponse{
 		ShimPid: uint32(os.Getpid()),
 	}, nil
 }
 
-// Update a running container
+// Update updates a running container.
 func (s *Service) Update(ctx context.Context, r *shimapi.UpdateTaskRequest) (*ptypes.Empty, error) {
 	return empty, errdefs.ToGRPC(errdefs.ErrNotImplemented)
 }
 
-// Wait for a process to exit
+// Wait waits for a process to exit.
 func (s *Service) Wait(ctx context.Context, r *shimapi.WaitRequest) (*shimapi.WaitResponse, error) {
 	p, err := s.getExecProcess(r.ID)
 	if err != nil {
@@ -451,7 +445,7 @@ 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
+				// 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")
@@ -495,7 +489,7 @@ func (s *Service) forward(publisher events.Publisher) {
 	}
 }
 
-// getInitProcess returns initial process
+// getInitProcess returns the init process.
 func (s *Service) getInitProcess() (rproc.Process, error) {
 	s.mu.Lock()
 	defer s.mu.Unlock()
@@ -506,7 +500,7 @@ func (s *Service) getInitProcess() (rproc.Process, error) {
 	return p, nil
 }
 
-// getExecProcess returns exec process
+// getExecProcess returns the given exec process.
 func (s *Service) getExecProcess(id string) (rproc.Process, error) {
 	s.mu.Lock()
 	defer s.mu.Unlock()
@@ -534,7 +528,7 @@ func getTopic(ctx context.Context, e interface{}) string {
 	case *eventstypes.TaskExecStarted:
 		return runtime.TaskExecStartedEventTopic
 	default:
-		logrus.Warnf("no topic for type %#v", e)
+		log.L.Printf("no topic for type %#v", e)
 	}
 	return runtime.TaskUnknownTopic
 }
@@ -551,10 +545,10 @@ func newInit(ctx context.Context, path, workDir, runtimeRoot, namespace string,
 
 	spec, err := utils.ReadSpec(r.Bundle)
 	if err != nil {
-		return nil, errors.Wrap(err, "read oci spec")
+		return nil, fmt.Errorf("read oci spec: %w", err)
 	}
 	if err := utils.UpdateVolumeAnnotations(r.Bundle, spec); err != nil {
-		return nil, errors.Wrap(err, "update volume annotations")
+		return nil, fmt.Errorf("update volume annotations: %w", err)
 	}
 
 	runsc.FormatLogPath(r.ID, config)
diff --git a/pkg/shim/v1/utils/BUILD b/pkg/shim/v1/utils/BUILD
new file mode 100644
index 000000000..9045781e1
--- /dev/null
+++ b/pkg/shim/v1/utils/BUILD
@@ -0,0 +1,26 @@
+load("//tools:defs.bzl", "go_library", "go_test")
+
+package(licenses = ["notice"])
+
+go_library(
+    name = "utils",
+    srcs = [
+        "utils.go",
+        "volumes.go",
+    ],
+    visibility = [
+        "//pkg/shim:__subpackages__",
+        "//shim:__subpackages__",
+    ],
+    deps = [
+        "@com_github_containerd_cri//pkg/annotations:go_default_library",
+        "@com_github_opencontainers_runtime-spec//specs-go:go_default_library",
+    ],
+)
+
+go_test(
+    name = "utils_test",
+    size = "small",
+    srcs = ["volumes_test.go"],
+    library = ":utils",
+)
diff --git a/pkg/shim/v1/utils/volumes.go b/pkg/shim/v1/utils/volumes.go
index 7323e7245..e4e9bf9b1 100644
--- a/pkg/shim/v1/utils/volumes.go
+++ b/pkg/shim/v1/utils/volumes.go
@@ -23,8 +23,6 @@ import (
 
 	"github.com/containerd/cri/pkg/annotations"
 	specs "github.com/opencontainers/runtime-spec/specs-go"
-	"github.com/pkg/errors"
-	"github.com/sirupsen/logrus"
 )
 
 const volumeKeyPrefix = "dev.gvisor.spec.mount."
@@ -32,13 +30,13 @@ const volumeKeyPrefix = "dev.gvisor.spec.mount."
 var kubeletPodsDir = "/var/lib/kubelet/pods"
 
 // volumeName gets volume name from volume annotation key, example:
-// dev.gvisor.spec.mount.NAME.share
+//	dev.gvisor.spec.mount.NAME.share
 func volumeName(k string) string {
 	return strings.SplitN(strings.TrimPrefix(k, volumeKeyPrefix), ".", 2)[0]
 }
 
 // volumeFieldName gets volume field name from volume annotation key, example:
-// `type` is the field of dev.gvisor.spec.mount.NAME.type
+//	`type` is the field of dev.gvisor.spec.mount.NAME.type
 func volumeFieldName(k string) string {
 	parts := strings.Split(strings.TrimPrefix(k, volumeKeyPrefix), ".")
 	return parts[len(parts)-1]
@@ -48,16 +46,16 @@ func volumeFieldName(k string) string {
 func podUID(s *specs.Spec) (string, error) {
 	sandboxLogDir := s.Annotations[annotations.SandboxLogDir]
 	if sandboxLogDir == "" {
-		return "", errors.New("no sandbox log path annotation")
+		return "", fmt.Errorf("no sandbox log path annotation")
 	}
 	fields := strings.Split(filepath.Base(sandboxLogDir), "_")
 	switch len(fields) {
-	case 1: // This is the old CRI logging path
+	case 1: // This is the old CRI logging path.
 		return fields[0], nil
-	case 3: // This is the new CRI logging path
+	case 3: // This is the new CRI logging path.
 		return fields[2], nil
 	}
-	return "", errors.Errorf("unexpected sandbox log path %q", sandboxLogDir)
+	return "", fmt.Errorf("unexpected sandbox log path %q", sandboxLogDir)
 }
 
 // isVolumeKey checks whether an annotation key is for volume.
@@ -79,7 +77,7 @@ func volumePath(volume, uid string) (string, error) {
 		return "", err
 	}
 	if len(dirs) != 1 {
-		return "", errors.Errorf("unexpected matched volume list %v", dirs)
+		return "", fmt.Errorf("unexpected matched volume list %v", dirs)
 	}
 	return dirs[0], nil
 }
@@ -103,7 +101,7 @@ func UpdateVolumeAnnotations(bundle string, s *specs.Spec) error {
 		if err != nil {
 			// Skip if we can't get pod UID, because this doesn't work
 			// for containerd 1.1.
-			logrus.WithError(err).Error("Can't get pod uid")
+			fmt.Errorf("Can't get pod uid: %w", err)
 			return nil
 		}
 	}
@@ -117,22 +115,25 @@ func UpdateVolumeAnnotations(bundle string, s *specs.Spec) error {
 		}
 		volume := volumeName(k)
 		if uid != "" {
-			// This is a sandbox
+			// This is a sandbox.
 			path, err := volumePath(volume, uid)
 			if err != nil {
-				return errors.Wrapf(err, "get volume path for %q", volume)
+				return fmt.Errorf("get volume path for %q: %w", volume, err)
 			}
 			s.Annotations[volumeSourceKey(volume)] = path
 			updated = true
 		} else {
-			// This is a container
+			// This is a container.
 			for i := range s.Mounts {
-				// An error is returned for sandbox if source annotation
-				// is not successfully applied, so it is guaranteed that
-				// the source annotation for sandbox has already been
-				// successfully applied at this point.
-				// The volume name is unique inside a pod, so matching without
-				// podUID is fine here.
+				// An error is returned for sandbox if source
+				// annotation is not successfully applied, so
+				// it is guaranteed that the source annotation
+				// for sandbox has already been successfully
+				// applied at this point.
+				//
+				// The volume name is unique inside a pod, so
+				// matching without podUID is fine here.
+				//
 				// TODO: Pass podUID down to shim for containers to do
 				// more accurate matching.
 				if yes, _ := isVolumePath(volume, s.Mounts[i].Source); yes {
@@ -147,7 +148,7 @@ func UpdateVolumeAnnotations(bundle string, s *specs.Spec) error {
 	if !updated {
 		return nil
 	}
-	// Update bundle
+	// Update bundle.
 	b, err := json.Marshal(s)
 	if err != nil {
 		return err
diff --git a/pkg/shim/v2/BUILD b/pkg/shim/v2/BUILD
new file mode 100644
index 000000000..450f62979
--- /dev/null
+++ b/pkg/shim/v2/BUILD
@@ -0,0 +1,41 @@
+load("//tools:defs.bzl", "go_library")
+
+package(licenses = ["notice"])
+
+go_library(
+    name = "v2",
+    srcs = [
+        "epoll.go",
+        "service.go",
+        "service_linux.go",
+    ],
+    visibility = ["//shim:__subpackages__"],
+    deps = [
+        "//pkg/shim/runsc",
+        "//pkg/shim/v1/proc",
+        "//pkg/shim/v1/utils",
+        "//pkg/shim/v2/options",
+        "//runsc/specutils",
+        "@com_github_burntsushi_toml//:go_default_library",
+        "@com_github_containerd_cgroups//:go_default_library",
+        "@com_github_containerd_cgroups//stats/v1:go_default_library",
+        "@com_github_containerd_console//:go_default_library",
+        "@com_github_containerd_containerd//api/events:go_default_library",
+        "@com_github_containerd_containerd//api/types/task:go_default_library",
+        "@com_github_containerd_containerd//errdefs:go_default_library",
+        "@com_github_containerd_containerd//events:go_default_library",
+        "@com_github_containerd_containerd//log:go_default_library",
+        "@com_github_containerd_containerd//mount:go_default_library",
+        "@com_github_containerd_containerd//namespaces:go_default_library",
+        "@com_github_containerd_containerd//runtime:go_default_library",
+        "@com_github_containerd_containerd//runtime/linux/runctypes:go_default_library",
+        "@com_github_containerd_containerd//runtime/proc:go_default_library",
+        "@com_github_containerd_containerd//runtime/v2/shim:go_default_library",
+        "@com_github_containerd_containerd//runtime/v2/task:go_default_library",
+        "@com_github_containerd_cri//pkg/api/runtimeoptions/v1:go_default_library",
+        "@com_github_containerd_fifo//:go_default_library",
+        "@com_github_containerd_typeurl//:go_default_library",
+        "@com_github_gogo_protobuf//types:go_default_library",
+        "@org_golang_x_sys//unix:go_default_library",
+    ],
+)
diff --git a/pkg/shim/v2/epoll.go b/pkg/shim/v2/epoll.go
index 57a2c5452..45cc38c2a 100644
--- a/pkg/shim/v2/epoll.go
+++ b/pkg/shim/v2/epoll.go
@@ -19,13 +19,13 @@ package v2
 
 import (
 	"context"
+	"fmt"
 	"sync"
 
 	"github.com/containerd/cgroups"
 	eventstypes "github.com/containerd/containerd/api/events"
 	"github.com/containerd/containerd/events"
 	"github.com/containerd/containerd/runtime"
-	"github.com/sirupsen/logrus"
 	"golang.org/x/sys/unix"
 )
 
@@ -71,7 +71,7 @@ func (e *epoller) run(ctx context.Context) {
 				if err == unix.EINTR {
 					continue
 				}
-				logrus.WithError(err).Error("cgroups: epoll wait")
+				fmt.Errorf("cgroups: epoll wait: %w", err)
 			}
 			for i := 0; i < n; i++ {
 				e.process(ctx, uintptr(events[i].Fd))
@@ -117,7 +117,7 @@ func (e *epoller) process(ctx context.Context, fd uintptr) {
 	if err := e.publisher.Publish(ctx, runtime.TaskOOMEventTopic, &eventstypes.TaskOOM{
 		ContainerID: i.id,
 	}); err != nil {
-		logrus.WithError(err).Error("publish OOM event")
+		fmt.Errorf("publish OOM event: %w", err)
 	}
 }
 
diff --git a/pkg/shim/v2/options/BUILD b/pkg/shim/v2/options/BUILD
new file mode 100644
index 000000000..ca212e874
--- /dev/null
+++ b/pkg/shim/v2/options/BUILD
@@ -0,0 +1,11 @@
+load("//tools:defs.bzl", "go_library")
+
+package(licenses = ["notice"])
+
+go_library(
+    name = "options",
+    srcs = [
+        "options.go",
+    ],
+    visibility = ["//:sandbox"],
+)
diff --git a/pkg/shim/v2/service.go b/pkg/shim/v2/service.go
index 0cff82a89..c67b1beba 100644
--- a/pkg/shim/v2/service.go
+++ b/pkg/shim/v2/service.go
@@ -16,6 +16,7 @@ package v2
 
 import (
 	"context"
+	"fmt"
 	"io/ioutil"
 	"os"
 	"os/exec"
@@ -26,6 +27,7 @@ import (
 
 	"github.com/BurntSushi/toml"
 	"github.com/containerd/cgroups"
+	metrics "github.com/containerd/cgroups/stats/v1"
 	"github.com/containerd/console"
 	eventstypes "github.com/containerd/containerd/api/events"
 	"github.com/containerd/containerd/api/types/task"
@@ -42,14 +44,13 @@ import (
 	runtimeoptions "github.com/containerd/cri/pkg/api/runtimeoptions/v1"
 	"github.com/containerd/typeurl"
 	ptypes "github.com/gogo/protobuf/types"
-	"github.com/pkg/errors"
-	"github.com/sirupsen/logrus"
 	"golang.org/x/sys/unix"
 
 	"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/options"
+	"gvisor.dev/gvisor/runsc/specutils"
 )
 
 var (
@@ -68,7 +69,7 @@ var _ = (taskAPI.TaskService)(&service{})
 // we assume that a config.toml should exist in the runtime root.
 const configFile = "config.toml"
 
-// New returns a new shim service that can be used via GRPC
+// New returns a new shim service that can be used via GRPC.
 func New(ctx context.Context, id string, publisher events.Publisher) (shim.Shim, error) {
 	ep, err := newOOMEpoller(publisher)
 	if err != nil {
@@ -89,13 +90,13 @@ func New(ctx context.Context, id string, publisher events.Publisher) (shim.Shim,
 	runsc.Monitor = shim.Default
 	if err := s.initPlatform(); err != nil {
 		cancel()
-		return nil, errors.Wrap(err, "failed to initialized platform behavior")
+		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
+// service is the shim implementation of a remote shim over GRPC.
 type service struct {
 	mu sync.Mutex
 
@@ -179,7 +180,7 @@ func (s *service) StartShim(ctx context.Context, id, containerdBinary, container
 		return "", err
 	}
 	if err := shim.SetScore(cmd.Process.Pid); err != nil {
-		return "", errors.Wrap(err, "failed to set OOM Score on shim")
+		return "", fmt.Errorf("failed to set OOM Score on shim: %w", err)
 	}
 	return address, nil
 }
@@ -201,10 +202,10 @@ func (s *service) Cleanup(ctx context.Context) (*taskAPI.DeleteResponse, error)
 	if err := r.Delete(ctx, s.id, &runsc.DeleteOpts{
 		Force: true,
 	}); err != nil {
-		logrus.WithError(err).Warn("failed to remove runc container")
+		log.L.Printf("failed to remove runc container: %v", err)
 	}
 	if err := mount.UnmountAll(filepath.Join(path, "rootfs"), 0); err != nil {
-		logrus.WithError(err).Warn("failed to cleanup rootfs mount")
+		log.L.Printf("failed to cleanup rootfs mount: %v", err)
 	}
 	return &taskAPI.DeleteResponse{
 		ExitedAt:   time.Now(),
@@ -224,14 +225,15 @@ func (s *service) writeRuntime(path, runtime string) error {
 	return ioutil.WriteFile(filepath.Join(path, "runtime"), []byte(runtime), 0600)
 }
 
-// Create a new initial process and container with the underlying OCI runtime
+// Create creates a new initial process and container with the underlying OCI
+// runtime.
 func (s *service) Create(ctx context.Context, r *taskAPI.CreateTaskRequest) (_ *taskAPI.CreateTaskResponse, err error) {
 	s.mu.Lock()
 	defer s.mu.Unlock()
 
 	ns, err := namespaces.NamespaceRequired(ctx)
 	if err != nil {
-		return nil, errors.Wrap(err, "create namespace")
+		return nil, fmt.Errorf("create namespace: %w", err)
 	}
 
 	// Read from root for now.
@@ -258,7 +260,7 @@ func (s *service) Create(ctx context.Context, r *taskAPI.CreateTaskRequest) (_ *
 			path = filepath.Join(root, configFile)
 			if _, err := os.Stat(path); err != nil {
 				if !os.IsNotExist(err) {
-					return nil, errors.Wrapf(err, "stat config file %q", path)
+					return nil, fmt.Errorf("stat config file %q: %w", path, err)
 				}
 				// A config file in runtime root is not required.
 				path = ""
@@ -268,15 +270,15 @@ func (s *service) Create(ctx context.Context, r *taskAPI.CreateTaskRequest) (_ *
 				break
 			}
 			if o.TypeUrl != options.OptionType {
-				return nil, errors.Errorf("unsupported runtimeoptions %q", o.TypeUrl)
+				return nil, fmt.Errorf("unsupported runtimeoptions %q", o.TypeUrl)
 			}
 			path = o.ConfigPath
 		default:
-			return nil, errors.Errorf("unsupported option type %q", r.Options.TypeUrl)
+			return nil, fmt.Errorf("unsupported option type %q", r.Options.TypeUrl)
 		}
 		if path != "" {
 			if _, err = toml.DecodeFile(path, &opts); err != nil {
-				return nil, errors.Wrapf(err, "decode config file %q", path)
+				return nil, fmt.Errorf("decode config file %q: %w", path, err)
 			}
 		}
 	}
@@ -312,8 +314,8 @@ func (s *service) Create(ctx context.Context, r *taskAPI.CreateTaskRequest) (_ *
 	}
 	defer func() {
 		if err != nil {
-			if err2 := mount.UnmountAll(rootfs, 0); err2 != nil {
-				logrus.WithError(err2).Warn("failed to cleanup rootfs mount")
+			if err := mount.UnmountAll(rootfs, 0); err != nil {
+				log.L.Printf("failed to cleanup rootfs mount: %v", err)
 			}
 		}
 	}()
@@ -324,7 +326,7 @@ func (s *service) Create(ctx context.Context, r *taskAPI.CreateTaskRequest) (_ *
 			Options: rm.Options,
 		}
 		if err := m.Mount(rootfs); err != nil {
-			return nil, errors.Wrapf(err, "failed to mount rootfs component %v", m)
+			return nil, fmt.Errorf("failed to mount rootfs component %v: %w", m, err)
 		}
 	}
 	process, err := newInit(
@@ -343,20 +345,21 @@ func (s *service) Create(ctx context.Context, r *taskAPI.CreateTaskRequest) (_ *
 	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
+	// Save the main task id and bundle to the shim for additional
+	// requests.
 	s.id = r.ID
 	s.bundle = r.Bundle
 
-	// Set up OOM notification on the sandbox's cgroup. This is done on sandbox
-	// create since the sandbox process will be created here.
+	// Set up OOM notification on the sandbox's cgroup. This is done on
+	// sandbox create since the sandbox process will be created here.
 	pid := process.Pid()
 	if pid > 0 {
 		cg, err := cgroups.Load(cgroups.V1, cgroups.PidPath(pid))
 		if err != nil {
-			return nil, errors.Wrapf(err, "loading cgroup for %d", pid)
+			return nil, fmt.Errorf("loading cgroup for %d: %w", pid, err)
 		}
 		if err := s.oomPoller.add(s.id, cg); err != nil {
-			return nil, errors.Wrapf(err, "add cg to OOM monitor")
+			return nil, fmt.Errorf("add cg to OOM monitor: %w", err)
 		}
 	}
 	s.task = process
@@ -367,7 +370,7 @@ func (s *service) Create(ctx context.Context, r *taskAPI.CreateTaskRequest) (_ *
 
 }
 
-// Start a process
+// Start starts a process.
 func (s *service) Start(ctx context.Context, r *taskAPI.StartRequest) (*taskAPI.StartResponse, error) {
 	p, err := s.getProcess(r.ExecID)
 	if err != nil {
@@ -383,7 +386,7 @@ func (s *service) Start(ctx context.Context, r *taskAPI.StartRequest) (*taskAPI.
 	}, nil
 }
 
-// Delete the initial process and container
+// Delete deletes the initial process and container.
 func (s *service) Delete(ctx context.Context, r *taskAPI.DeleteRequest) (*taskAPI.DeleteResponse, error) {
 	p, err := s.getProcess(r.ExecID)
 	if err != nil {
@@ -411,7 +414,7 @@ func (s *service) Delete(ctx context.Context, r *taskAPI.DeleteRequest) (*taskAP
 	}, nil
 }
 
-// Exec an additional process inside the container
+// Exec spawns an additional process inside the container.
 func (s *service) Exec(ctx context.Context, r *taskAPI.ExecProcessRequest) (*ptypes.Empty, error) {
 	s.mu.Lock()
 	p := s.processes[r.ExecID]
@@ -440,7 +443,7 @@ func (s *service) Exec(ctx context.Context, r *taskAPI.ExecProcessRequest) (*pty
 	return empty, nil
 }
 
-// ResizePty of a process
+// ResizePty resizes the terminal of a process.
 func (s *service) ResizePty(ctx context.Context, r *taskAPI.ResizePtyRequest) (*ptypes.Empty, error) {
 	p, err := s.getProcess(r.ExecID)
 	if err != nil {
@@ -456,7 +459,7 @@ func (s *service) ResizePty(ctx context.Context, r *taskAPI.ResizePtyRequest) (*
 	return empty, nil
 }
 
-// State returns runtime state information for a process
+// State returns runtime state information for a process.
 func (s *service) State(ctx context.Context, r *taskAPI.StateRequest) (*taskAPI.StateResponse, error) {
 	p, err := s.getProcess(r.ExecID)
 	if err != nil {
@@ -490,17 +493,17 @@ func (s *service) State(ctx context.Context, r *taskAPI.StateRequest) (*taskAPI.
 	}, nil
 }
 
-// Pause the container
+// Pause the container.
 func (s *service) Pause(ctx context.Context, r *taskAPI.PauseRequest) (*ptypes.Empty, error) {
 	return empty, errdefs.ToGRPC(errdefs.ErrNotImplemented)
 }
 
-// Resume the container
+// Resume the container.
 func (s *service) Resume(ctx context.Context, r *taskAPI.ResumeRequest) (*ptypes.Empty, error) {
 	return empty, errdefs.ToGRPC(errdefs.ErrNotImplemented)
 }
 
-// Kill a process with the provided signal
+// Kill a process with the provided signal.
 func (s *service) Kill(ctx context.Context, r *taskAPI.KillRequest) (*ptypes.Empty, error) {
 	p, err := s.getProcess(r.ExecID)
 	if err != nil {
@@ -515,7 +518,7 @@ func (s *service) Kill(ctx context.Context, r *taskAPI.KillRequest) (*ptypes.Emp
 	return empty, nil
 }
 
-// Pids returns all pids inside the container
+// Pids returns all pids inside the container.
 func (s *service) Pids(ctx context.Context, r *taskAPI.PidsRequest) (*taskAPI.PidsResponse, error) {
 	pids, err := s.getContainerPids(ctx, r.ID)
 	if err != nil {
@@ -533,7 +536,7 @@ func (s *service) Pids(ctx context.Context, r *taskAPI.PidsRequest) (*taskAPI.Pi
 				}
 				a, err := typeurl.MarshalAny(d)
 				if err != nil {
-					return nil, errors.Wrapf(err, "failed to marshal process %d info", pid)
+					return nil, fmt.Errorf("failed to marshal process %d info: %w", pid, err)
 				}
 				pInfo.Info = a
 				break
@@ -546,7 +549,7 @@ func (s *service) Pids(ctx context.Context, r *taskAPI.PidsRequest) (*taskAPI.Pi
 	}, nil
 }
 
-// CloseIO of a process
+// CloseIO closes the I/O context of a process.
 func (s *service) CloseIO(ctx context.Context, r *taskAPI.CloseIORequest) (*ptypes.Empty, error) {
 	p, err := s.getProcess(r.ExecID)
 	if err != nil {
@@ -554,18 +557,18 @@ func (s *service) CloseIO(ctx context.Context, r *taskAPI.CloseIORequest) (*ptyp
 	}
 	if stdin := p.Stdin(); stdin != nil {
 		if err := stdin.Close(); err != nil {
-			return nil, errors.Wrap(err, "close stdin")
+			return nil, fmt.Errorf("close stdin: %w", err)
 		}
 	}
 	return empty, nil
 }
 
-// Checkpoint the container
+// Checkpoint checkpoints the container.
 func (s *service) Checkpoint(ctx context.Context, r *taskAPI.CheckpointTaskRequest) (*ptypes.Empty, error) {
 	return empty, errdefs.ToGRPC(errdefs.ErrNotImplemented)
 }
 
-// Connect returns shim information such as the shim's pid
+// Connect returns shim information such as the shim's pid.
 func (s *service) Connect(ctx context.Context, r *taskAPI.ConnectRequest) (*taskAPI.ConnectResponse, error) {
 	var pid int
 	if s.task != nil {
@@ -605,52 +608,52 @@ func (s *service) Stats(ctx context.Context, r *taskAPI.StatsRequest) (*taskAPI.
 	// gvisor currently (as of 2020-03-03) only returns the total memory
 	// usage and current PID value[0]. However, we copy the common fields here
 	// so that future updates will propagate correct information.  We're
-	// using the cgroups.Metrics structure so we're returning the same type
+	// using the metrics.Metrics structure so we're returning the same type
 	// as runc.
 	//
 	// [0]: https://github.com/google/gvisor/blob/277a0d5a1fbe8272d4729c01ee4c6e374d047ebc/runsc/boot/events.go#L61-L81
-	data, err := typeurl.MarshalAny(&cgroups.Metrics{
-		CPU: &cgroups.CPUStat{
-			Usage: &cgroups.CPUUsage{
+	data, err := typeurl.MarshalAny(&metrics.Metrics{
+		CPU: &metrics.CPUStat{
+			Usage: &metrics.CPUUsage{
 				Total:  stats.Cpu.Usage.Total,
 				Kernel: stats.Cpu.Usage.Kernel,
 				User:   stats.Cpu.Usage.User,
 				PerCPU: stats.Cpu.Usage.Percpu,
 			},
-			Throttling: &cgroups.Throttle{
+			Throttling: &metrics.Throttle{
 				Periods:          stats.Cpu.Throttling.Periods,
 				ThrottledPeriods: stats.Cpu.Throttling.ThrottledPeriods,
 				ThrottledTime:    stats.Cpu.Throttling.ThrottledTime,
 			},
 		},
-		Memory: &cgroups.MemoryStat{
+		Memory: &metrics.MemoryStat{
 			Cache: stats.Memory.Cache,
-			Usage: &cgroups.MemoryEntry{
+			Usage: &metrics.MemoryEntry{
 				Limit:   stats.Memory.Usage.Limit,
 				Usage:   stats.Memory.Usage.Usage,
 				Max:     stats.Memory.Usage.Max,
 				Failcnt: stats.Memory.Usage.Failcnt,
 			},
-			Swap: &cgroups.MemoryEntry{
+			Swap: &metrics.MemoryEntry{
 				Limit:   stats.Memory.Swap.Limit,
 				Usage:   stats.Memory.Swap.Usage,
 				Max:     stats.Memory.Swap.Max,
 				Failcnt: stats.Memory.Swap.Failcnt,
 			},
-			Kernel: &cgroups.MemoryEntry{
+			Kernel: &metrics.MemoryEntry{
 				Limit:   stats.Memory.Kernel.Limit,
 				Usage:   stats.Memory.Kernel.Usage,
 				Max:     stats.Memory.Kernel.Max,
 				Failcnt: stats.Memory.Kernel.Failcnt,
 			},
-			KernelTCP: &cgroups.MemoryEntry{
+			KernelTCP: &metrics.MemoryEntry{
 				Limit:   stats.Memory.KernelTCP.Limit,
 				Usage:   stats.Memory.KernelTCP.Usage,
 				Max:     stats.Memory.KernelTCP.Max,
 				Failcnt: stats.Memory.KernelTCP.Failcnt,
 			},
 		},
-		Pids: &cgroups.PidsStat{
+		Pids: &metrics.PidsStat{
 			Current: stats.Pids.Current,
 			Limit:   stats.Pids.Limit,
 		},
@@ -663,12 +666,12 @@ func (s *service) Stats(ctx context.Context, r *taskAPI.StatsRequest) (*taskAPI.
 	}, nil
 }
 
-// Update a running container
+// Update updates a running container.
 func (s *service) Update(ctx context.Context, r *taskAPI.UpdateTaskRequest) (*ptypes.Empty, error) {
 	return empty, errdefs.ToGRPC(errdefs.ErrNotImplemented)
 }
 
-// Wait for a process to exit
+// Wait waits for a process to exit.
 func (s *service) Wait(ctx context.Context, r *taskAPI.WaitRequest) (*taskAPI.WaitResponse, error) {
 	p, err := s.getProcess(r.ExecID)
 	if err != nil {
@@ -697,7 +700,7 @@ 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
+				// 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")
@@ -733,7 +736,7 @@ func (s *service) getContainerPids(ctx context.Context, id string) ([]uint32, er
 	p := s.task
 	s.mu.Unlock()
 	if p == nil {
-		return nil, errors.Wrapf(errdefs.ErrFailedPrecondition, "container must be created")
+		return nil, fmt.Errorf("container must be created: %w", errdefs.ErrFailedPrecondition)
 	}
 	ps, err := p.(*proc.Init).Runtime().Ps(ctx, id)
 	if err != nil {
@@ -752,7 +755,7 @@ func (s *service) forward(publisher events.Publisher) {
 		err := publisher.Publish(ctx, getTopic(e), e)
 		cancel()
 		if err != nil {
-			logrus.WithError(err).Error("post event")
+			fmt.Errorf("post event: %w", err)
 		}
 	}
 }
@@ -787,7 +790,7 @@ func getTopic(e interface{}) string {
 	case *eventstypes.TaskExecStarted:
 		return runtime.TaskExecStartedEventTopic
 	default:
-		logrus.Warnf("no topic for type %#v", e)
+		log.L.Printf("no topic for type %#v", e)
 	}
 	return runtime.TaskUnknownTopic
 }
@@ -795,10 +798,10 @@ func getTopic(e interface{}) string {
 func newInit(ctx context.Context, path, workDir, namespace string, platform rproc.Platform, r *proc.CreateConfig, options *options.Options, rootfs string) (*proc.Init, error) {
 	spec, err := utils.ReadSpec(r.Bundle)
 	if err != nil {
-		return nil, errors.Wrap(err, "read oci spec")
+		return nil, fmt.Errorf("read oci spec: %w", err)
 	}
 	if err := utils.UpdateVolumeAnnotations(r.Bundle, spec); err != nil {
-		return nil, errors.Wrap(err, "update volume annotations")
+		return nil, fmt.Errorf("update volume annotations: %w", err)
 	}
 	runsc.FormatLogPath(r.ID, options.RunscConfig)
 	runtime := proc.NewRunsc(options.Root, path, namespace, options.BinaryName, options.RunscConfig)
@@ -814,7 +817,7 @@ func newInit(ctx context.Context, path, workDir, namespace string, platform rpro
 	p.WorkDir = workDir
 	p.IoUID = int(options.IoUid)
 	p.IoGID = int(options.IoGid)
-	p.Sandbox = utils.IsSandbox(spec)
+	p.Sandbox = specutils.SpecContainerType(spec) == specutils.ContainerTypeSandbox
 	p.UserLog = utils.UserLogPath(spec)
 	p.Monitor = shim.Default
 	return p, nil
diff --git a/pkg/shim/v2/service_linux.go b/pkg/shim/v2/service_linux.go
index cd259cd44..257c58812 100644
--- a/pkg/shim/v2/service_linux.go
+++ b/pkg/shim/v2/service_linux.go
@@ -19,13 +19,13 @@ package v2
 
 import (
 	"context"
+	"fmt"
 	"io"
 	"sync"
 	"syscall"
 
 	"github.com/containerd/console"
 	"github.com/containerd/fifo"
-	"github.com/pkg/errors"
 )
 
 type linuxPlatform struct {
@@ -34,7 +34,7 @@ type linuxPlatform struct {
 
 func (p *linuxPlatform) CopyConsole(ctx context.Context, console console.Console, stdin, stdout, stderr string, wg, cwg *sync.WaitGroup) (console.Console, error) {
 	if p.epoller == nil {
-		return nil, errors.New("uninitialized epoller")
+		return nil, fmt.Errorf("uninitialized epoller")
 	}
 
 	epollConsole, err := p.epoller.Add(console)
@@ -81,11 +81,11 @@ func (p *linuxPlatform) CopyConsole(ctx context.Context, console console.Console
 
 func (p *linuxPlatform) ShutdownConsole(ctx context.Context, cons console.Console) error {
 	if p.epoller == nil {
-		return errors.New("uninitialized epoller")
+		return fmt.Errorf("uninitialized epoller")
 	}
 	epollConsole, ok := cons.(*console.EpollConsole)
 	if !ok {
-		return errors.Errorf("expected EpollConsole, got %#v", cons)
+		return fmt.Errorf("expected EpollConsole, got %#v", cons)
 	}
 	return epollConsole.Shutdown(p.epoller.CloseConsole)
 }
@@ -102,7 +102,7 @@ func (s *service) initPlatform() error {
 	}
 	epoller, err := console.NewEpoller()
 	if err != nil {
-		return errors.Wrap(err, "failed to initialize epoller")
+		return fmt.Errorf("failed to initialize epoller: %w", err)
 	}
 	s.platform = &linuxPlatform{
 		epoller: epoller,