fix podman cp can create an extra directory level

Signed-off-by: zhangguanzhang <zhangguanzhang@qq.com>

pkg/domain/infra/abi/cp.go

@@ -260,7 +260,19 @@ func containerCopy(srcPath, destPath, src, dest string, idMappingOpts storage.ID
 	if srcfi.IsDir() {
 		logrus.Debugf("copying %q to %q", srcPath+string(os.PathSeparator)+"*", dest+string(os.PathSeparator)+"*")
 		if destDirIsExist && !strings.HasSuffix(src, fmt.Sprintf("%s.", string(os.PathSeparator))) {
-			destPath = filepath.Join(destPath, filepath.Base(srcPath))
+			srcPathBase := filepath.Base(srcPath)
+			if !isFromHostToCtr {
+				pathArr := strings.SplitN(src, ":", 2)
+				if len(pathArr) != 2 {
+					return errors.Errorf("invalid arguments %s, you must specify source path", src)
+				}
+				if pathArr[1] == "/" {
+					// If `srcPath` is the root directory of the container,
+					// `srcPath` will be `.../${sha256_ID}/merged/`, so do not join it
+					srcPathBase = ""
+				}
+			}
+			destPath = filepath.Join(destPath, srcPathBase)
 		}
 		if err = copyWithTar(srcPath, destPath); err != nil {
 			return errors.Wrapf(err, "error copying %q to %q", srcPath, dest)

test/e2e/build/Dockerfile.test-cp-root-dir

@@ -0,0 +1,2 @@
+FROM scratch
+COPY Dockerfile.test-cp-root-dir /

test/e2e/cp_test.go

@@ -294,4 +294,42 @@ var _ = Describe("Podman cp", func() {
 
 		os.Remove("testfile1")
 	})
+	It("podman cp the root directory from the ctr to an existing directory on the host ", func() {
+		imgName := "test-cp-root-dir:latest"
+		DockerfileName := "Dockerfile.test-cp-root-dir"
+		ctrName := "test-container-cp-root"
+
+		session := podmanTest.PodmanNoCache([]string{"build", "-f", "build/" + DockerfileName, "-t", imgName, "build/"})
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).To(Equal(0))
+
+		testDirPath := filepath.Join(podmanTest.RunRoot, "TestDirForCp")
+
+		session = podmanTest.Podman([]string{"create", "--name", ctrName, imgName, "dummy"})
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).To(Equal(0))
+
+		err := os.Mkdir(testDirPath, 0755)
+		Expect(err).To(BeNil())
+		defer os.RemoveAll(testDirPath)
+
+		// Copy the root directory of the container to an existing directory
+		session = podmanTest.Podman([]string{"cp", ctrName + ":/", testDirPath})
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).To(Equal(0))
+
+		// The file should be in the directory,
+		// not one layer too much of the directory called merged
+		checkFile := filepath.Join(testDirPath, DockerfileName)
+		_, err = os.Stat(checkFile)
+		Expect(err).To(BeNil())
+
+		session = podmanTest.Podman([]string{"container", "rm", ctrName})
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).To(Equal(0))
+
+		session = podmanTest.PodmanNoCache([]string{"rmi", "-f", imgName})
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).To(Equal(0))
+	})
 })