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| /*
copy file to pod
*/
package cp
import (
"archive/tar"
"context"
"fmt"
"io"
"io/ioutil"
"log"
"os"
"path"
"strings"
corev1 "k8s.io/api/core/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/kubernetes/scheme"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/remotecommand"
)
type Pod struct {
Name string
Namespace string
ContainerName string
}
func (i *Pod) CopyToPod(ctx context.Context, client *kubernetes.Clientset, config *rest.Config, srcPath string, destPath string) error {
reader, writer := io.Pipe()
if destPath != "/" && strings.HasSuffix(string(destPath[len(destPath)-1]), "/") {
destPath = destPath[:len(destPath)-1]
}
if err := checkDestinationIsDir(ctx, client, config, i, destPath); err == nil {
destPath = destPath + "/" + path.Base(srcPath)
}
go func() {
defer writer.Close()
err := makeTar(srcPath, destPath, writer)
if err != nil {
fmt.Println(err)
}
}()
var cmdArr []string
cmdArr = []string{"tar", "-xf", "-"}
destDir := path.Dir(destPath)
if len(destDir) > 0 {
cmdArr = append(cmdArr, "-C", destDir)
}
//remote shell.
req := client.CoreV1().RESTClient().
Post().
Namespace(i.Namespace).
Resource("pods").
Name(i.Name).
SubResource("exec").
VersionedParams(&corev1.PodExecOptions{
Container: i.ContainerName,
Command: cmdArr,
Stdin: true,
Stdout: true,
Stderr: true,
TTY: false,
}, scheme.ParameterCodec)
exec, err := remotecommand.NewSPDYExecutor(config, "POST", req.URL())
if err != nil {
return err
}
err = exec.Stream(remotecommand.StreamOptions{
Stdin: reader,
Stdout: os.Stdout,
Stderr: os.Stderr,
Tty: false,
})
if err != nil {
return err
}
return nil
}
func checkDestinationIsDir(ctx context.Context, client *kubernetes.Clientset, config *rest.Config, i *Pod, destPath string) error {
return i.Exec(ctx, client, config, []string{"test", "-d", destPath})
}
func makeTar(srcPath, destPath string, writer io.Writer) error {
// TODO: use compression here?
tarWriter := tar.NewWriter(writer)
defer tarWriter.Close()
srcPath = path.Clean(srcPath)
destPath = path.Clean(destPath)
return recursiveTar(path.Dir(srcPath), path.Base(srcPath), path.Dir(destPath), path.Base(destPath), tarWriter)
}
func recursiveTar(srcBase, srcFile, destBase, destFile string, tarWriter *tar.Writer) error {
// defer func() {
// fmt.Println("d")
// if err := recover(); err != nil {
// fmt.Println(err) // 这里的err其实就是panic传入的内容
// }
// fmt.Println("e")
// }()
filepath := path.Join(srcBase, srcFile)
stat, err := os.Lstat(filepath)
if err != nil {
return err
}
if stat.IsDir() {
files, err := ioutil.ReadDir(filepath)
if err != nil {
return err
}
if len(files) == 0 {
//case empty directory
hdr, _ := tar.FileInfoHeader(stat, filepath)
hdr.Name = destFile
if err := tarWriter.WriteHeader(hdr); err != nil {
return err
}
}
for _, f := range files {
if err := recursiveTar(srcBase, path.Join(srcFile, f.Name()), destBase, path.Join(destFile, f.Name()), tarWriter); err != nil {
return err
}
}
return nil
} else if stat.Mode()&os.ModeSymlink != 0 {
//case soft link
hdr, _ := tar.FileInfoHeader(stat, filepath)
target, err := os.Readlink(filepath)
if err != nil {
return err
}
hdr.Linkname = target
hdr.Name = destFile
if err := tarWriter.WriteHeader(hdr); err != nil {
return err
}
} else {
//case regular file or other file type like pipe
hdr, err := tar.FileInfoHeader(stat, filepath)
if err != nil {
return err
}
hdr.Name = destFile
err = tarWriter.WriteHeader(hdr)
if err != nil {
log.Println(err)
return err
}
f, err := os.Open(filepath)
if err != nil {
return err
}
defer f.Close()
if _, err := io.Copy(tarWriter, f); err != nil {
return err
}
return f.Close()
}
return nil
}
func (i *Pod) Exec(ctx context.Context, client *kubernetes.Clientset, config *rest.Config, cmd []string) error {
req := client.CoreV1().RESTClient().
Post().
Namespace(i.Namespace).
Resource("pods").
Name(i.Name).
SubResource("exec").
VersionedParams(&corev1.PodExecOptions{
Container: i.ContainerName,
Command: cmd,
Stdin: true,
Stdout: true,
Stderr: true,
TTY: false,
}, scheme.ParameterCodec)
exec, err := remotecommand.NewSPDYExecutor(config, "POST", req.URL())
if err != nil {
return err
}
err = exec.Stream(remotecommand.StreamOptions{
Stdin: strings.NewReader(""),
Stdout: os.Stdout,
Stderr: os.Stderr,
Tty: false,
})
if err != nil {
return err
}
return nil
}
|
