Move runtime/restart/monitor to plugins/restart

Signed-off-by: Derek McGowan <derek@mcg.dev>

plugins/restart/change.go

@@ -0,0 +1,103 @@
+/*
+   Copyright The containerd 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
+
+       http://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 monitor
+
+import (
+	"context"
+	"fmt"
+	"net/url"
+	"strconv"
+	"syscall"
+
+	"github.com/containerd/containerd/v2/cio"
+	containerd "github.com/containerd/containerd/v2/client"
+	"github.com/containerd/containerd/v2/runtime/restart"
+)
+
+type stopChange struct {
+	container containerd.Container
+}
+
+func (s *stopChange) apply(ctx context.Context, client *containerd.Client) error {
+	return killTask(ctx, s.container)
+}
+
+type startChange struct {
+	container containerd.Container
+	logURI    string
+	count     int
+}
+
+func (s *startChange) apply(ctx context.Context, client *containerd.Client) error {
+	log := cio.NullIO
+	spec, err := s.container.Spec(ctx)
+	if err != nil {
+		return err
+	}
+	useTTY := spec.Process.Terminal
+	if s.logURI != "" {
+		uri, err := url.Parse(s.logURI)
+		if err != nil {
+			return fmt.Errorf("failed to parse %v into url: %w", s.logURI, err)
+		}
+		if useTTY {
+			log = cio.TerminalLogURI(uri)
+		} else {
+			log = cio.LogURI(uri)
+		}
+	}
+
+	if s.count > 0 {
+		labels := map[string]string{
+			restart.CountLabel: strconv.Itoa(s.count),
+		}
+		opt := containerd.WithAdditionalContainerLabels(labels)
+		if err := s.container.Update(ctx, containerd.UpdateContainerOpts(opt)); err != nil {
+			return err
+		}
+	}
+	killTask(ctx, s.container)
+	task, err := s.container.NewTask(ctx, log)
+	if err != nil {
+		return err
+	}
+	return task.Start(ctx)
+}
+
+func killTask(ctx context.Context, container containerd.Container) error {
+	task, err := container.Task(ctx, nil)
+	if err == nil {
+		wait, err := task.Wait(ctx)
+		if err != nil {
+			if _, derr := task.Delete(ctx); derr == nil {
+				return nil
+			}
+			return err
+		}
+		if err := task.Kill(ctx, syscall.SIGKILL, containerd.WithKillAll); err != nil {
+			if _, derr := task.Delete(ctx); derr == nil {
+				return nil
+			}
+			return err
+		}
+		<-wait
+		if _, err := task.Delete(ctx); err != nil {
+			return err
+		}
+	}
+	return nil
+}