Exemple #1
0
// importLayer adds a new layer to the tag and graph store based on the given data.
func (d *Driver) importLayer(id string, layerData archive.Reader, parentLayerPaths []string) (size int64, err error) {
	var w hcsshim.LayerWriter
	w, err = hcsshim.NewLayerWriter(d.info, id, parentLayerPaths)
	if err != nil {
		return
	}
	size, err = writeLayerFromTar(layerData, w)
	if err != nil {
		w.Close()
		return
	}
	err = w.Close()
	if err != nil {
		return
	}
	return
}
Exemple #2
0
func writeLayerFromTar(r archive.Reader, w hcsshim.LayerWriter) (int64, error) {
	t := tar.NewReader(r)
	hdr, err := t.Next()
	totalSize := int64(0)
	buf := bufio.NewWriter(nil)
	for err == nil {
		base := path.Base(hdr.Name)
		if strings.HasPrefix(base, archive.WhiteoutPrefix) {
			name := path.Join(path.Dir(hdr.Name), base[len(archive.WhiteoutPrefix):])
			err = w.Remove(filepath.FromSlash(name))
			if err != nil {
				return 0, err
			}
			hdr, err = t.Next()
		} else {
			var (
				name     string
				size     int64
				fileInfo *winio.FileBasicInfo
			)
			name, size, fileInfo, err = backuptar.FileInfoFromHeader(hdr)
			if err != nil {
				return 0, err
			}
			err = w.Add(filepath.FromSlash(name), fileInfo)
			if err != nil {
				return 0, err
			}
			buf.Reset(w)
			hdr, err = backuptar.WriteBackupStreamFromTarFile(buf, t, hdr)
			ferr := buf.Flush()
			if ferr != nil {
				err = ferr
			}
			totalSize += size
		}
	}
	if err != io.EOF {
		return 0, err
	}
	return totalSize, nil
}
Exemple #3
0
// importLayer adds a new layer to the tag and graph store based on the given data.
func (d *Driver) importLayer(id string, layerData archive.Reader, parentLayerPaths []string) (size int64, err error) {
	if hcsshim.IsTP4() {
		// Import from TP4 format to maintain compatibility with existing images.
		var tempFolder string
		tempFolder, err = ioutil.TempDir("", "hcs")
		if err != nil {
			return
		}
		defer os.RemoveAll(tempFolder)

		if size, err = chrootarchive.ApplyLayer(tempFolder, layerData); err != nil {
			return
		}
		if err = hcsshim.ImportLayer(d.info, id, tempFolder, parentLayerPaths); err != nil {
			return
		}
		return
	}

	var w hcsshim.LayerWriter
	w, err = hcsshim.NewLayerWriter(d.info, id, parentLayerPaths)
	if err != nil {
		return
	}

	size, err = writeLayerFromTar(layerData, w)
	if err != nil {
		w.Close()
		return
	}
	err = w.Close()
	if err != nil {
		return
	}
	return
}
Exemple #4
0
func writeLayerFromTar(r io.Reader, w hcsshim.LayerWriter, root string) (int64, error) {
	t := tar.NewReader(r)
	hdr, err := t.Next()
	totalSize := int64(0)
	buf := bufio.NewWriter(nil)
	for err == nil {
		base := path.Base(hdr.Name)
		if strings.HasPrefix(base, archive.WhiteoutPrefix) {
			name := path.Join(path.Dir(hdr.Name), base[len(archive.WhiteoutPrefix):])
			err = w.Remove(filepath.FromSlash(name))
			if err != nil {
				return 0, err
			}
			hdr, err = t.Next()
		} else if hdr.Typeflag == tar.TypeLink {
			err = w.AddLink(filepath.FromSlash(hdr.Name), filepath.FromSlash(hdr.Linkname))
			if err != nil {
				return 0, err
			}
			hdr, err = t.Next()
		} else {
			var (
				name     string
				size     int64
				fileInfo *winio.FileBasicInfo
			)
			name, size, fileInfo, err = backuptar.FileInfoFromHeader(hdr)
			if err != nil {
				return 0, err
			}
			err = w.Add(filepath.FromSlash(name), fileInfo)
			if err != nil {
				return 0, err
			}
			hdr, err = writeBackupStreamFromTarAndSaveMutatedFiles(buf, w, t, hdr, root)
			totalSize += size
		}
	}
	if err != io.EOF {
		return 0, err
	}
	return totalSize, nil
}
Exemple #5
0
func writeLayerFromTar(r archive.Reader, w hcsshim.LayerWriter) (int64, error) {
	t := tar.NewReader(r)
	hdr, err := t.Next()
	totalSize := int64(0)
	buf := bufio.NewWriter(nil)
	for err == nil {
		base := path.Base(hdr.Name)
		if strings.HasPrefix(base, archive.WhiteoutPrefix) {
			name := path.Join(path.Dir(hdr.Name), base[len(archive.WhiteoutPrefix):])
			err = w.Remove(filepath.FromSlash(name))
			if err != nil {
				return 0, err
			}
			hdr, err = t.Next()
		} else if hdr.Typeflag == tar.TypeLink {
			err = w.AddLink(filepath.FromSlash(hdr.Name), filepath.FromSlash(hdr.Linkname))
			if err != nil {
				return 0, err
			}
			hdr, err = t.Next()
		} else {
			var (
				name     string
				size     int64
				fileInfo *winio.FileBasicInfo
			)
			name, size, fileInfo, err = backuptar.FileInfoFromHeader(hdr)
			if err != nil {
				return 0, err
			}
			err = w.Add(filepath.FromSlash(name), fileInfo)
			if err != nil {
				return 0, err
			}
			buf.Reset(w)

			// Add the Hyper-V Virutal Machine group ACE to the security descriptor
			// for TP5 so that Xenons can access all files. This is not necessary
			// for post-TP5 builds.
			if isTP5OrOlder() {
				if sddl, ok := hdr.Winheaders["sd"]; ok {
					var ace string
					if hdr.Typeflag == tar.TypeDir {
						ace = "(A;OICI;0x1200a9;;;S-1-5-83-0)"
					} else {
						ace = "(A;;0x1200a9;;;S-1-5-83-0)"
					}
					if hdr.Winheaders["sd"], ok = addAceToSddlDacl(sddl, ace); !ok {
						logrus.Debugf("failed to add VM ACE to %s", sddl)
					}
				}
			}

			hdr, err = backuptar.WriteBackupStreamFromTarFile(buf, t, hdr)
			ferr := buf.Flush()
			if ferr != nil {
				err = ferr
			}
			totalSize += size
		}
	}
	if err != io.EOF {
		return 0, err
	}
	return totalSize, nil
}