Permalink
102 lines (83 sloc) 3.74 KB
package client // import "github.com/docker/docker/client"
import (
"context"
"encoding/base64"
"encoding/json"
"fmt"
"io"
"net/http"
"net/url"
"path/filepath"
"strings"
"github.com/docker/docker/api/types"
)
// ContainerStatPath returns Stat information about a path inside the container filesystem.
func (cli *Client) ContainerStatPath(ctx context.Context, containerID, path string) (types.ContainerPathStat, error) {
query := url.Values{}
query.Set("path", filepath.ToSlash(path)) // Normalize the paths used in the API.
urlStr := "/containers/" + containerID + "/archive"
response, err := cli.head(ctx, urlStr, query, nil)
if err != nil {
return types.ContainerPathStat{}, wrapResponseError(err, response, "container:path", containerID+":"+path)
}
defer ensureReaderClosed(response)
return getContainerPathStatFromHeader(response.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 types.CopyToContainerOptions) error {
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")
}
apiPath := "/containers/" + containerID + "/archive"
response, err := cli.putRaw(ctx, apiPath, query, content, nil)
if err != nil {
return wrapResponseError(err, response, "container:path", containerID+":"+dstPath)
}
defer ensureReaderClosed(response)
if response.statusCode != http.StatusOK {
return fmt.Errorf("unexpected status code from daemon: %d", response.statusCode)
}
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, types.ContainerPathStat, error) {
query := make(url.Values, 1)
query.Set("path", filepath.ToSlash(srcPath)) // Normalize the paths used in the API.
apiPath := "/containers/" + containerID + "/archive"
response, err := cli.get(ctx, apiPath, query, nil)
if err != nil {
return nil, types.ContainerPathStat{}, wrapResponseError(err, response, "container:path", containerID+":"+srcPath)
}
if response.statusCode != http.StatusOK {
return nil, types.ContainerPathStat{}, fmt.Errorf("unexpected status code from daemon: %d", response.statusCode)
}
// 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(response.header)
if err != nil {
return nil, stat, fmt.Errorf("unable to get resource stat from response: %s", err)
}
return response.body, stat, err
}
func getContainerPathStatFromHeader(header http.Header) (types.ContainerPathStat, error) {
var stat types.ContainerPathStat
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
}