summaryrefslogtreecommitdiff
path: root/cmd/podman/export.go
blob: 16c1f5c9b191fc736b365ae3881ef9dcf71ef63b (plain)
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
package main

import (
	"os"

	"github.com/pkg/errors"
	"github.com/projectatomic/libpod/cmd/podman/libpodruntime"
	"github.com/sirupsen/logrus"
	"github.com/urfave/cli"
)

var (
	exportFlags = []cli.Flag{
		cli.StringFlag{
			Name:  "output, o",
			Usage: "Write to a file, default is STDOUT",
			Value: "/dev/stdout",
		},
	}
	exportDescription = "Exports container's filesystem contents as a tar archive" +
		" and saves it on the local machine."
	exportCommand = cli.Command{
		Name:        "export",
		Usage:       "Export container's filesystem contents as a tar archive",
		Description: exportDescription,
		Flags:       exportFlags,
		Action:      exportCmd,
		ArgsUsage:   "CONTAINER",
	}
)

// exportCmd saves a container to a tarball on disk
func exportCmd(c *cli.Context) error {
	if err := validateFlags(c, exportFlags); err != nil {
		return err
	}

	runtime, err := libpodruntime.GetRuntime(c)
	if err != nil {
		return errors.Wrapf(err, "could not get runtime")
	}
	defer runtime.Shutdown(false)

	args := c.Args()
	if len(args) == 0 {
		return errors.Errorf("container id must be specified")
	}
	if len(args) > 1 {
		return errors.Errorf("too many arguments given, need 1 at most.")
	}

	output := c.String("output")
	if output == "/dev/stdout" {
		file := os.Stdout
		if logrus.IsTerminal(file) {
			return errors.Errorf("refusing to export to terminal. Use -o flag or redirect")
		}
	}
	if err := validateFileName(output); err != nil {
		return err
	}

	ctr, err := runtime.LookupContainer(args[0])
	if err != nil {
		return errors.Wrapf(err, "error looking up container %q", args[0])
	}

	return ctr.Export(output)
}