forked from kubernetes/kubernetes
-
Notifications
You must be signed in to change notification settings - Fork 1
/
cp.go
434 lines (376 loc) · 10.5 KB
/
cp.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
/*
Copyright 2016 The Kubernetes 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 cmd
import (
"archive/tar"
"bytes"
"errors"
"fmt"
"io"
"io/ioutil"
"os"
"path"
"path/filepath"
"strings"
"k8s.io/kubernetes/pkg/kubectl/cmd/templates"
cmdutil "k8s.io/kubernetes/pkg/kubectl/cmd/util"
"k8s.io/kubernetes/pkg/kubectl/util/i18n"
"github.com/renstrom/dedent"
"github.com/spf13/cobra"
)
var (
cpExample = templates.Examples(i18n.T(`
# !!!Important Note!!!
# Requires that the 'tar' binary is present in your container
# image. If 'tar' is not present, 'kubectl cp' will fail.
# Copy /tmp/foo_dir local directory to /tmp/bar_dir in a remote pod in the default namespace
kubectl cp /tmp/foo_dir <some-pod>:/tmp/bar_dir
# Copy /tmp/foo local file to /tmp/bar in a remote pod in a specific container
kubectl cp /tmp/foo <some-pod>:/tmp/bar -c <specific-container>
# Copy /tmp/foo local file to /tmp/bar in a remote pod in namespace <some-namespace>
kubectl cp /tmp/foo <some-namespace>/<some-pod>:/tmp/bar
# Copy /tmp/foo from a remote pod to /tmp/bar locally
kubectl cp <some-namespace>/<some-pod>:/tmp/foo /tmp/bar`))
cpUsageStr = dedent.Dedent(`
expected 'cp <file-spec-src> <file-spec-dest> [-c container]'.
<file-spec> is:
[namespace/]pod-name:/file/path for a remote file
/file/path for a local file`)
)
// NewCmdCp creates a new Copy command.
func NewCmdCp(f cmdutil.Factory, cmdOut, cmdErr io.Writer) *cobra.Command {
cmd := &cobra.Command{
Use: "cp <file-spec-src> <file-spec-dest>",
Short: i18n.T("Copy files and directories to and from containers."),
Long: "Copy files and directories to and from containers.",
Example: cpExample,
Run: func(cmd *cobra.Command, args []string) {
cmdutil.CheckErr(runCopy(f, cmd, cmdOut, cmdErr, args))
},
}
cmd.Flags().StringP("container", "c", "", "Container name. If omitted, the first container in the pod will be chosen")
return cmd
}
type fileSpec struct {
PodNamespace string
PodName string
File string
}
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, ":")
if len(pieces) == 1 {
return fileSpec{File: arg}, nil
}
if len(pieces) != 2 {
// FIXME Kubernetes can't copy files that contain a ':'
// character.
return fileSpec{}, errFileSpecDoesntMatchFormat
}
file := pieces[1]
pieces = strings.Split(pieces[0], "/")
if len(pieces) == 1 {
return fileSpec{
PodName: pieces[0],
File: file,
}, nil
}
if len(pieces) == 2 {
return fileSpec{
PodNamespace: pieces[0],
PodName: pieces[1],
File: file,
}, nil
}
return fileSpec{}, errFileSpecDoesntMatchFormat
}
func runCopy(f cmdutil.Factory, cmd *cobra.Command, out, cmderr io.Writer, args []string) error {
if len(args) != 2 {
return cmdutil.UsageErrorf(cmd, cpUsageStr)
}
srcSpec, err := extractFileSpec(args[0])
if err != nil {
return err
}
destSpec, err := extractFileSpec(args[1])
if err != nil {
return err
}
if len(srcSpec.PodName) != 0 {
return copyFromPod(f, cmd, cmderr, srcSpec, destSpec)
}
if len(destSpec.PodName) != 0 {
return copyToPod(f, cmd, out, cmderr, srcSpec, destSpec)
}
return cmdutil.UsageErrorf(cmd, "One of src or dest must be a remote file specification")
}
// checkDestinationIsDir receives a destination fileSpec and
// determines if the provided destination path exists on the
// pod. If the destination path does not exist or is _not_ a
// directory, an error is returned with the exit code received.
func checkDestinationIsDir(dest fileSpec, f cmdutil.Factory, cmd *cobra.Command) error {
options := &ExecOptions{
StreamOptions: StreamOptions{
Out: bytes.NewBuffer([]byte{}),
Err: bytes.NewBuffer([]byte{}),
Namespace: dest.PodNamespace,
PodName: dest.PodName,
},
Command: []string{"test", "-d", dest.File},
Executor: &DefaultRemoteExecutor{},
}
return execute(f, cmd, options)
}
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)
if strings.HasSuffix(string(dest.File[len(dest.File)-1]), "/") {
dest.File = dest.File[:len(dest.File)-1]
}
if err := checkDestinationIsDir(dest, f, cmd); err == nil {
// If no error, dest.File was found to be a directory.
// Copy specified src into it
dest.File = dest.File + "/" + path.Base(src.File)
}
go func() {
defer writer.Close()
err := makeTar(src.File, dest.File, writer)
cmdutil.CheckErr(err)
}()
// TODO: Improve error messages by first testing if 'tar' is present in the container?
cmdArr := []string{"tar", "xf", "-"}
destDir := path.Dir(dest.File)
if len(destDir) > 0 {
cmdArr = append(cmdArr, "-C", destDir)
}
options := &ExecOptions{
StreamOptions: StreamOptions{
In: reader,
Out: stdout,
Err: stderr,
Stdin: true,
Namespace: dest.PodNamespace,
PodName: dest.PodName,
},
Command: cmdArr,
Executor: &DefaultRemoteExecutor{},
}
return execute(f, cmd, options)
}
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{
In: nil,
Out: outStream,
Err: cmderr,
Namespace: src.PodNamespace,
PodName: src.PodName,
},
// TODO: Improve error messages by first testing if 'tar' is present in the container?
Command: []string{"tar", "cf", "-", src.File},
Executor: &DefaultRemoteExecutor{},
}
go func() {
defer outStream.Close()
execute(f, cmd, options)
}()
prefix := getPrefix(src.File)
prefix = path.Clean(prefix)
return untarAll(reader, dest.File, prefix)
}
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, tw *tar.Writer) error {
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 := 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
} 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()
if _, err := io.Copy(tw, f); err != nil {
return err
}
return f.Close()
}
return nil
}
func untarAll(reader io.Reader, destFile, prefix string) error {
entrySeq := -1
// TODO: use compression here?
tarReader := tar.NewReader(reader)
for {
header, err := tarReader.Next()
if err != nil {
if err != io.EOF {
return err
}
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 {
return err
}
if header.FileInfo().IsDir() {
if err := os.MkdirAll(outFileName, 0755); err != nil {
return err
}
continue
}
// handle coping remote file into local directory
if entrySeq == 0 && !header.FileInfo().IsDir() {
exists, err := dirExists(outFileName)
if err != nil {
return err
}
if exists {
outFileName = filepath.Join(outFileName, path.Base(header.Name))
}
}
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()
if _, err := io.Copy(outFile, tarReader); err != nil {
return err
}
if err := outFile.Close(); err != nil {
return err
}
}
}
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
}
func getPrefix(file string) string {
if file[0] == '/' {
// tar strips the leading '/' if it's there, so we will too
return file[1:]
}
return file
}
func execute(f cmdutil.Factory, cmd *cobra.Command, options *ExecOptions) error {
if len(options.Namespace) == 0 {
namespace, _, err := f.DefaultNamespace()
if err != nil {
return err
}
options.Namespace = namespace
}
container := cmdutil.GetFlagString(cmd, "container")
if len(container) > 0 {
options.ContainerName = container
}
config, err := f.ClientConfig()
if err != nil {
return err
}
options.Config = config
clientset, err := f.ClientSet()
if err != nil {
return err
}
options.PodClient = clientset.Core()
if err := options.Validate(); err != nil {
return err
}
if err := options.Run(); err != nil {
return err
}
return nil
}
// dirExists checks if a path exists and is a directory.
func dirExists(path string) (bool, error) {
fi, err := os.Stat(path)
if err == nil && fi.IsDir() {
return true, nil
}
if os.IsNotExist(err) {
return false, nil
}
return false, err
}