to_disk.py
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	# Copyright (C) 2016-2018 The Software Heritage developers
	# See the AUTHORS file at the top-level directory of this distribution
	# License: GNU General Public License version 3, or any later version
	# See top-level LICENSE file for more information

	import functools
	import collections
	import os

	from swh.model import hashutil
	from swh.model.from_disk import mode_to_perms, DentryPerms

	SKIPPED_MESSAGE = (b'This content has not been retrieved in the '
	b'Software Heritage archive due to its size.')

	HIDDEN_MESSAGE = (b'This content is hidden.')


	def get_filtered_files_content(storage, files_data):
	"""Retrieve the files specified by files_data and apply filters for skipped
	and missing contents.

	Args:
	storage: the storage from which to retrieve the objects
	files_data: list of file entries as returned by directory_ls()

	Yields:
	The entries given in files_data with a new 'content' key that points to
	the file content in bytes.

	The contents can be replaced by a specific message to indicate that
	they could not be retrieved (either due to privacy policy or because
	their sizes were too big for us to archive it).
	"""
	contents_to_fetch = [f['sha1'] for f in files_data
	if f['status'] == 'visible']
	contents_fetched = storage.content_get(contents_to_fetch)
	contents = {c['sha1']: c['data'] for c in contents_fetched}

	for file_data in files_data:
	if file_data['status'] == 'visible':
	content = contents[file_data['sha1']]
	elif file_data['status'] == 'absent':
	content = SKIPPED_MESSAGE
	elif file_data['status'] == 'hidden':
	content = HIDDEN_MESSAGE

	yield {'content': content, **file_data}


	def apply_chunked(func, input_list, chunk_size):
	"""Apply func on input_list divided in chunks of size chunk_size"""
	for i in range(0, len(input_list), chunk_size):
	yield from func(input_list[i:i + chunk_size])


	class DirectoryBuilder:
	"""Reconstructs the on-disk representation of a directory in the storage.
	"""

	def __init__(self, storage, root, dir_id):
	"""Initialize the directory builder.

	Args:
	storage: the storage object
	root: the path where the directory should be reconstructed
	dir_id: the identifier of the directory in the storage
	"""
	self.storage = storage
	self.root = root
	self.dir_id = dir_id

	def build(self):
	"""Perform the reconstruction of the directory in the given root."""
	# Retrieve data from the database.
	data = self.storage.directory_ls(self.dir_id, recursive=True)

	# Split into files, revisions and directory data.
	entries = collections.defaultdict(list)
	for entry in data:
	entries[entry['type']].append(entry)

	# Recreate the directory's subtree and then the files into it.
	self._create_tree(entries['dir'])
	self._create_files(entries['file'])
	self._create_revisions(entries['rev'])

	def _create_tree(self, directories):
	"""Create a directory tree from the given paths

	The tree is created from `root` and each given directory in
	`directories` will be created.
	"""
	# Directories are sorted by depth so they are created in the
	# right order
	bsep = os.path.sep.encode()
	directories = sorted(directories,
	key=lambda x: len(x['name'].split(bsep)))
	for dir in directories:
	os.makedirs(os.path.join(self.root, dir['name']))

	def _create_files(self, files_data):
	"""Create the files in the tree and fetch their contents."""
	f = functools.partial(get_filtered_files_content, self.storage)
	files_data = apply_chunked(f, files_data, 1000)

	for file_data in files_data:
	path = os.path.join(self.root, file_data['name'])
	self._create_file(path, file_data['content'], file_data['perms'])

	def _create_revisions(self, revs_data):
	"""Create the revisions in the tree as broken symlinks to the target
	identifier."""
	for file_data in revs_data:
	path = os.path.join(self.root, file_data['name'])
	self._create_file(path, hashutil.hash_to_hex(file_data['target']),
	mode=0o120000)

	def _create_file(self, path, content, mode=0o100644):
	"""Create the given file and fill it with content."""
	perms = mode_to_perms(mode)
	if perms == DentryPerms.symlink:
	os.symlink(content, path)
	else:
	with open(path, 'wb') as f:
	f.write(content)
	os.chmod(path, perms.value)

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