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This patch improve kubectl cp command from two aspects

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A.support soft link better
before this patch
  "kubectl cp" command will copy the soft link to destination as an empty regular file
after this patch
  "kubectl cp" command will behave the same as tar command
  this patch improves it on both from container and to container

B.fix some bugs
1.from container to host
  a.when copy a file ends with '/', it will cause a panic.
    for example, container gakki has a regular file /tmp/test, then run command
    kubectl cp gakki:/tmp/test/ /tmp
    panic happens
  b.when copy a file which does not exist in container, the command ends up without
    any error information

2.from host to container
  a.when run command like
    kubectl cp "" gakki:/tmp
    it will try cp current directory to container, in other words, this command works
    the same as kubectl cp . gakki:/tmp
  b.current cp command will omit an empty directory

modified:   pkg/kubectl/cmd/cp.go
modified:   pkg/kubectl/cmd/cp_test.go
This commit is contained in:
WanLinghao 2017-10-13 11:57:09 +08:00
parent 7c75723867
commit b1f85e2dfe
2 changed files with 152 additions and 53 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

99
pkg/kubectl/cmd/cp.go
View File

@ -20,6 +20,7 @@ import (
"archive/tar"
"bytes"
"errors"
"fmt"
"io"
"io/ioutil"
"os"
@ -82,7 +83,10 @@ type fileSpec struct {
File string
}
var errFileSpecDoesntMatchFormat = errors.New("Filespec must match the canonical format: [[namespace/]pod:]file/path")
var (
errFileSpecDoesntMatchFormat = errors.New("Filespec must match the canonical format: [[namespace/]pod:]file/path")
errFileCannotBeEmpty = errors.New("Filepath can not be empty")
)
func extractFileSpec(arg string) (fileSpec, error) {
pieces := strings.Split(arg, ":")
@ -157,6 +161,9 @@ func checkDestinationIsDir(dest fileSpec, f cmdutil.Factory, cmd *cobra.Command)
}
func copyToPod(f cmdutil.Factory, cmd *cobra.Command, stdout, stderr io.Writer, src, dest fileSpec) error {
if len(src.File) == 0 {
return errFileCannotBeEmpty
}
reader, writer := io.Pipe()
// strip trailing slash (if any)
@ -201,6 +208,10 @@ func copyToPod(f cmdutil.Factory, cmd *cobra.Command, stdout, stderr io.Writer,
}
func copyFromPod(f cmdutil.Factory, cmd *cobra.Command, cmderr io.Writer, src, dest fileSpec) error {
if len(src.File) == 0 {
return errFileCannotBeEmpty
}
reader, outStream := io.Pipe()
options := &ExecOptions{
StreamOptions: StreamOptions{
@ -222,7 +233,7 @@ func copyFromPod(f cmdutil.Factory, cmd *cobra.Command, cmderr io.Writer, src, d
execute(f, cmd, options)
}()
prefix := getPrefix(src.File)
prefix = path.Clean(prefix)
return untarAll(reader, dest.File, prefix)
}
@ -238,7 +249,7 @@ func makeTar(srcPath, destPath string, writer io.Writer) error {
func recursiveTar(srcBase, srcFile, destBase, destFile string, tw *tar.Writer) error {
filepath := path.Join(srcBase, srcFile)
stat, err := os.Stat(filepath)
stat, err := os.Lstat(filepath)
if err != nil {
return err
}
@ -247,28 +258,55 @@ func recursiveTar(srcBase, srcFile, destBase, destFile string, tw *tar.Writer) e
if err != nil {
return err
}
if len(files) == 0 {
//case empty directory
hdr, _ := tar.FileInfoHeader(stat, filepath)
hdr.Name = destFile
if err := tw.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()), tw); err != nil {
return err
}
}
return nil
}
hdr, err := tar.FileInfoHeader(stat, filepath)
if err != 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 := tw.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
if err := tw.WriteHeader(hdr); err != nil {
return err
}
f, err := os.Open(filepath)
if err != nil {
return err
}
defer f.Close()
_, err = io.Copy(tw, f)
return err
}
hdr.Name = destFile
if err := tw.WriteHeader(hdr); err != nil {
return err
}
f, err := os.Open(filepath)
if err != nil {
return err
}
defer f.Close()
_, err = io.Copy(tw, f)
return err
return nil
}
func untarAll(reader io.Reader, destFile, prefix string) error {
@ -285,6 +323,7 @@ func untarAll(reader io.Reader, destFile, prefix string) error {
break
}
entrySeq++
mode := header.FileInfo().Mode()
outFileName := path.Join(destFile, header.Name[len(prefix):])
baseName := path.Dir(outFileName)
if err := os.MkdirAll(baseName, 0755); err != nil {
@ -308,15 +347,27 @@ func untarAll(reader io.Reader, destFile, prefix string) error {
outFileName = filepath.Join(outFileName, path.Base(header.Name))
}
}
outFile, err := os.Create(outFileName)
if err != nil {
return err
}
defer outFile.Close()
if _, err := io.Copy(outFile, tarReader); err != nil {
return err
if mode&os.ModeSymlink != 0 {
err := os.Symlink(header.Linkname, outFileName)
if err != nil {
return err
}
} else {
outFile, err := os.Create(outFileName)
if err != nil {
return err
}
defer outFile.Close()
io.Copy(outFile, tarReader)
}
}
if entrySeq == -1 {
//if no file was copied
errInfo := fmt.Sprintf("error: %s no such file or directory", prefix)
return errors.New(errInfo)
}
return nil
}

106
pkg/kubectl/cmd/cp_test.go
View File

@ -29,6 +29,13 @@ import (
"testing"
)
type FileType int
const (
RegularFile FileType = 0
SymLink FileType = 1
)
func TestExtractFileSpec(t *testing.T) {
tests := []struct {
spec string
@ -119,24 +126,34 @@ func TestTarUntar(t *testing.T) {
}()
files := []struct {
name string
data string
name string
data string
fileType FileType
}{
{
name: "foo",
data: "foobarbaz",
name: "foo",
data: "foobarbaz",
fileType: RegularFile,
},
{
name: "dir/blah",
data: "bazblahfoo",
name: "dir/blah",
data: "bazblahfoo",
fileType: RegularFile,
},
{
name: "some/other/directory/",
data: "with more data here",
name: "some/other/directory/",
data: "with more data here",
fileType: RegularFile,
},
{
name: "blah",
data: "same file name different data",
name: "blah",
data: "same file name different data",
fileType: RegularFile,
},
{
name: "gakki",
data: "/tmp/gakki",
fileType: SymLink,
},
}
@ -146,20 +163,32 @@ func TestTarUntar(t *testing.T) {
t.Errorf("unexpected error: %v", err)
t.FailNow()
}
f, err := os.Create(filepath)
if err != nil {
t.Errorf("unexpected error: %v", err)
t.FailNow()
}
defer f.Close()
if _, err := io.Copy(f, bytes.NewBuffer([]byte(file.data))); err != nil {
t.Errorf("unexpected error: %v", err)
if file.fileType == RegularFile {
f, err := os.Create(filepath)
if err != nil {
t.Errorf("unexpected error: %v", err)
t.FailNow()
}
defer f.Close()
if _, err := io.Copy(f, bytes.NewBuffer([]byte(file.data))); err != nil {
t.Errorf("unexpected error: %v", err)
t.FailNow()
}
} else if file.fileType == SymLink {
err := os.Symlink(file.data, filepath)
if err != nil {
t.Errorf("unexpected error: %v", err)
t.FailNow()
}
} else {
t.Errorf("unexpected file type: %v", file)
t.FailNow()
}
}
writer := &bytes.Buffer{}
if err := makeTar(dir, dir2, writer); err != nil {
if err := makeTar(dir, dir, writer); err != nil {
t.Errorf("unexpected error: %v", err)
}
@ -170,16 +199,35 @@ func TestTarUntar(t *testing.T) {
}
for _, file := range files {
filepath := path.Join(dir, file.name)
f, err := os.Open(filepath)
if err != nil {
t.Errorf("unexpected error: %v", err)
}
defer f.Close()
buff := &bytes.Buffer{}
io.Copy(buff, f)
if file.data != string(buff.Bytes()) {
t.Errorf("expected: %s, saw: %s", file.data, string(buff.Bytes()))
absPath := dir2 + strings.TrimPrefix(dir, os.TempDir())
filepath := path.Join(absPath, file.name)
if file.fileType == RegularFile {
f, err := os.Open(filepath)
if err != nil {
t.Errorf("unexpected error: %v", err)
}
defer f.Close()
buff := &bytes.Buffer{}
io.Copy(buff, f)
if file.data != string(buff.Bytes()) {
t.Errorf("expected: %s, saw: %s", file.data, string(buff.Bytes()))
}
} else if file.fileType == SymLink {
dest, err := os.Readlink(filepath)
if err != nil {
t.Errorf("unexpected error: %v", err)
}
if file.data != dest {
t.Errorf("expected: %s, saw: %s", file.data, dest)
}
} else {
t.Errorf("unexpected file type: %v", file)
t.FailNow()
}
}
}