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package client
import (
"context"
"encoding/base64"
"encoding/json"
"fmt"
"io"
"net/http"
"net/url"
"path/filepath"
"strings"
"github.com/docker/docker/api/types/container"
)
// ContainerStatPath returns stat information about a path inside the container filesystem.
func (cli *Client) ContainerStatPath(ctx context.Context, containerID, path string) (container.PathStat, error) {
containerID, err := trimID("container", containerID)
if err != nil {
return container.PathStat{}, err
}
query := url.Values{}
query.Set("path", filepath.ToSlash(path)) // Normalize the paths used in the API.
resp, err := cli.head(ctx, "/containers/"+containerID+"/archive", query, nil)
defer ensureReaderClosed(resp)
if err != nil {
return container.PathStat{}, err
}
return getContainerPathStatFromHeader(resp.Header)
}
// CopyToContainer copies content into the container filesystem.
// Note that `content` must be a Reader for a TAR archive
func (cli *Client) CopyToContainer(ctx context.Context, containerID, dstPath string, content io.Reader, options container.CopyToContainerOptions) error {
containerID, err := trimID("container", containerID)
if err != nil {
return err
}
query := url.Values{}
query.Set("path", filepath.ToSlash(dstPath)) // Normalize the paths used in the API.
// Do not allow for an existing directory to be overwritten by a non-directory and vice versa.
if !options.AllowOverwriteDirWithFile {
query.Set("noOverwriteDirNonDir", "true")
}
if options.CopyUIDGID {
query.Set("copyUIDGID", "true")
}
response, err := cli.putRaw(ctx, "/containers/"+containerID+"/archive", query, content, nil)
defer ensureReaderClosed(response)
if err != nil {
return err
}
return nil
}
// CopyFromContainer gets the content from the container and returns it as a Reader
// for a TAR archive to manipulate it in the host. It's up to the caller to close the reader.
func (cli *Client) CopyFromContainer(ctx context.Context, containerID, srcPath string) (io.ReadCloser, container.PathStat, error) {
containerID, err := trimID("container", containerID)
if err != nil {
return nil, container.PathStat{}, err
}
query := make(url.Values, 1)
query.Set("path", filepath.ToSlash(srcPath)) // Normalize the paths used in the API.
resp, err := cli.get(ctx, "/containers/"+containerID+"/archive", query, nil)
if err != nil {
return nil, container.PathStat{}, err
}
// In order to get the copy behavior right, we need to know information
// about both the source and the destination. The response headers include
// stat info about the source that we can use in deciding exactly how to
// copy it locally. Along with the stat info about the local destination,
// we have everything we need to handle the multiple possibilities there
// can be when copying a file/dir from one location to another file/dir.
stat, err := getContainerPathStatFromHeader(resp.Header)
if err != nil {
return nil, stat, fmt.Errorf("unable to get resource stat from response: %s", err)
}
return resp.Body, stat, err
}
func getContainerPathStatFromHeader(header http.Header) (container.PathStat, error) {
var stat container.PathStat
encodedStat := header.Get("X-Docker-Container-Path-Stat")
statDecoder := base64.NewDecoder(base64.StdEncoding, strings.NewReader(encodedStat))
err := json.NewDecoder(statDecoder).Decode(&stat)
if err != nil {
err = fmt.Errorf("unable to decode container path stat header: %s", err)
}
return stat, err
}
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