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moby--moby/api/client/cp.go

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package client
import (
"fmt"
"io"
"strings"
"github.com/docker/docker/engine"
"github.com/docker/docker/pkg/archive"
flag "github.com/docker/docker/pkg/mflag"
)
// CmdCp copies files/folders from a path on the container to a directory on the host running the command.
//
// If HOSTDIR is '-', the data is written as a tar file to STDOUT.
//
// Usage: docker cp CONTAINER:PATH HOSTDIR
func (cli *DockerCli) CmdCp(args ...string) error {
cmd := cli.Subcmd("cp", "CONTAINER:PATH HOSTDIR|-", "Copy files/folders from a PATH on the container to a HOSTDIR on the host\nrunning the command. Use '-' to write the data\nas a tar file to STDOUT.", true)
cmd.Require(flag.Exact, 2)
cmd.ParseFlags(args, true)
var copyData engine.Env
info := strings.Split(cmd.Arg(0), ":")
if len(info) != 2 {
return fmt.Errorf("Error: Path not specified")
}
copyData.Set("Resource", info[1])
copyData.Set("HostPath", cmd.Arg(1))
stream, statusCode, err := cli.call("POST", "/containers/"+info[0]+"/copy", copyData, nil)
if stream != nil {
defer stream.Close()
}
if statusCode == 404 {
return fmt.Errorf("No such container: %v", info[0])
}
if err != nil {
return err
}
if statusCode == 200 {
dest := copyData.Get("HostPath")
if dest == "-" {
_, err = io.Copy(cli.out, stream)
} else {
err = archive.Untar(stream, dest, &archive.TarOptions{NoLchown: true})
}
if err != nil {
return err
}
}
return nil
}