runtime: move all code to src/runtime

To prepare for merging into kata-containers repository.

Signed-off-by: Peng Tao <bergwolf@hyper.sh>

src/runtime/pkg/katautils/container_engine.go

@@ -0,0 +1,75 @@
+// Copyright (c) 2019 SUSE LLC
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+
+package katautils
+
+import (
+	"os/exec"
+)
+
+type CtrEngine struct {
+	Name string
+}
+
+var (
+	DockerLikeCtrEngines = []string{"docker", "podman"}
+)
+
+func (e *CtrEngine) Init(name string) (string, error) {
+	var out string
+	out, err := RunCommandFull([]string{name, "version"}, true)
+	if err != nil {
+		return out, err
+	}
+
+	e.Name = name
+	return out, nil
+}
+
+func (e *CtrEngine) Inspect(image string) (string, error) {
+	// Only hit the network if the image doesn't exist locally
+	return RunCommand([]string{e.Name, "inspect", "--type=image", image})
+}
+
+func (e *CtrEngine) Pull(image string) (string, error) {
+	return RunCommand([]string{e.Name, "pull", image})
+}
+
+func (e *CtrEngine) Create(image string) (string, error) {
+	return RunCommand([]string{e.Name, "create", image})
+}
+
+func (e *CtrEngine) Rm(ctrID string) (string, error) {
+	return RunCommand([]string{e.Name, "rm", ctrID})
+}
+
+func (e *CtrEngine) GetRootfs(ctrID string, dir string) error {
+	cmd1 := exec.Command(e.Name, "export", ctrID)
+	cmd2 := exec.Command("tar", "-C", dir, "-xvf", "-")
+
+	cmd1Stdout, err := cmd1.StdoutPipe()
+	if err != nil {
+		return err
+	}
+
+	cmd2.Stdin = cmd1Stdout
+
+	err = cmd2.Start()
+	if err != nil {
+		return err
+	}
+
+	err = cmd1.Run()
+	if err != nil {
+		return err
+	}
+
+	err = cmd2.Wait()
+	if err != nil {
+		return err
+	}
+
+	return nil
+}