feat: replace github.com/pkg/errors to errors

Signed-off-by: haoyun <yun.hao@daocloud.io>
Co-authored-by: zounengren <zouyee1989@gmail.com>

pkg/oom/v1/v1.go

@@ -21,6 +21,7 @@ package v1
 
 import (
 	"context"
+	"fmt"
 	"sync"
 
 	"github.com/containerd/cgroups"
@@ -28,7 +29,6 @@ import (
 	"github.com/containerd/containerd/pkg/oom"
 	"github.com/containerd/containerd/runtime"
 	"github.com/containerd/containerd/runtime/v2/shim"
-	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
 	"golang.org/x/sys/unix"
 )
@@ -93,7 +93,7 @@ func (e *epoller) Run(ctx context.Context) {
 func (e *epoller) Add(id string, cgx interface{}) error {
 	cg, ok := cgx.(cgroups.Cgroup)
 	if !ok {
-		return errors.Errorf("expected cgroups.Cgroup, got: %T", cgx)
+		return fmt.Errorf("expected cgroups.Cgroup, got: %T", cgx)
 	}
 	e.mu.Lock()
 	defer e.mu.Unlock()

pkg/oom/v2/v2.go

@@ -21,13 +21,13 @@ package v2
 
 import (
 	"context"
+	"fmt"
 
 	cgroupsv2 "github.com/containerd/cgroups/v2"
 	eventstypes "github.com/containerd/containerd/api/events"
 	"github.com/containerd/containerd/pkg/oom"
 	"github.com/containerd/containerd/runtime"
 	"github.com/containerd/containerd/runtime/v2/shim"
-	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
 )
 
@@ -89,7 +89,7 @@ func (w *watcher) Run(ctx context.Context) {
 func (w *watcher) Add(id string, cgx interface{}) error {
 	cg, ok := cgx.(*cgroupsv2.Manager)
 	if !ok {
-		return errors.Errorf("expected *cgroupsv2.Manager, got: %T", cgx)
+		return fmt.Errorf("expected *cgroupsv2.Manager, got: %T", cgx)
 	}
 	// FIXME: cgroupsv2.Manager does not support closing eventCh routine currently.
 	// The routine shuts down when an error happens, mostly when the cgroup is deleted.