services/fuse/arvados_fuse/fusedir.py

   1 # Copyright (C) The Arvados Authors. All rights reserved.
   2 #
   3 # SPDX-License-Identifier: AGPL-3.0
   4
   5 import logging
   6 import re
   7 import time
   8 import llfuse
   9 import arvados
  10 import apiclient
  11 import functools
  12 import threading
  13 from apiclient import errors as apiclient_errors
  14 import errno
  15 import time
  16
  17 from fusefile import StringFile, ObjectFile, FuncToJSONFile, FuseArvadosFile
  18 from fresh import FreshBase, convertTime, use_counter, check_update
  19
  20 import arvados.collection
  21 from arvados.util import portable_data_hash_pattern, uuid_pattern, collection_uuid_pattern, group_uuid_pattern, user_uuid_pattern, link_uuid_pattern
  22
  23 _logger = logging.getLogger('arvados.arvados_fuse')
  24
  25
  26 # Match any character which FUSE or Linux cannot accommodate as part
  27 # of a filename. (If present in a collection filename, they will
  28 # appear as underscores in the fuse mount.)
  29 _disallowed_filename_characters = re.compile('[\x00/]')
  30
  31 # '.' and '..' are not reachable if API server is newer than #6277
  32 def sanitize_filename(dirty):
  33     """Replace disallowed filename characters with harmless "_"."""
  34     if dirty is None:
  35         return None
  36     elif dirty == '':
  37         return '_'
  38     elif dirty == '.':
  39         return '_'
  40     elif dirty == '..':
  41         return '__'
  42     else:
  43         return _disallowed_filename_characters.sub('_', dirty)
  44
  45
  46 class Directory(FreshBase):
  47     """Generic directory object, backed by a dict.
  48
  49     Consists of a set of entries with the key representing the filename
  50     and the value referencing a File or Directory object.
  51     """
  52
  53     def __init__(self, parent_inode, inodes):
  54         """parent_inode is the integer inode number"""
  55
  56         super(Directory, self).__init__()
  57
  58         self.inode = None
  59         if not isinstance(parent_inode, int):
  60             raise Exception("parent_inode should be an int")
  61         self.parent_inode = parent_inode
  62         self.inodes = inodes
  63         self._entries = {}
  64         self._mtime = time.time()
  65
  66     #  Overriden by subclasses to implement logic to update the entries dict
  67     #  when the directory is stale
  68     @use_counter
  69     def update(self):
  70         pass
  71
  72     # Only used when computing the size of the disk footprint of the directory
  73     # (stub)
  74     def size(self):
  75         return 0
  76
  77     def persisted(self):
  78         return False
  79
  80     def checkupdate(self):
  81         if self.stale():
  82             try:
  83                 self.update()
  84             except apiclient.errors.HttpError as e:
  85                 _logger.warn(e)
  86
  87     @use_counter
  88     @check_update
  89     def __getitem__(self, item):
  90         return self._entries[item]
  91
  92     @use_counter
  93     @check_update
  94     def items(self):
  95         return list(self._entries.items())
  96
  97     @use_counter
  98     @check_update
  99     def __contains__(self, k):
 100         return k in self._entries
 101
 102     @use_counter
 103     @check_update
 104     def __len__(self):
 105         return len(self._entries)
 106
 107     def fresh(self):
 108         self.inodes.touch(self)
 109         super(Directory, self).fresh()
 110
 111     def merge(self, items, fn, same, new_entry):
 112         """Helper method for updating the contents of the directory.
 113
 114         Takes a list describing the new contents of the directory, reuse
 115         entries that are the same in both the old and new lists, create new
 116         entries, and delete old entries missing from the new list.
 117
 118         :items: iterable with new directory contents
 119
 120         :fn: function to take an entry in 'items' and return the desired file or
 121         directory name, or None if this entry should be skipped
 122
 123         :same: function to compare an existing entry (a File or Directory
 124         object) with an entry in the items list to determine whether to keep
 125         the existing entry.
 126
 127         :new_entry: function to create a new directory entry (File or Directory
 128         object) from an entry in the items list.
 129
 130         """
 131
 132         oldentries = self._entries
 133         self._entries = {}
 134         changed = False
 135         for i in items:
 136             name = sanitize_filename(fn(i))
 137             if name:
 138                 if name in oldentries and same(oldentries[name], i):
 139                     # move existing directory entry over
 140                     self._entries[name] = oldentries[name]
 141                     del oldentries[name]
 142                 else:
 143                     _logger.debug("Adding entry '%s' to inode %i", name, self.inode)
 144                     # create new directory entry
 145                     ent = new_entry(i)
 146                     if ent is not None:
 147                         self._entries[name] = self.inodes.add_entry(ent)
 148                         changed = True
 149
 150         # delete any other directory entries that were not in found in 'items'
 151         for i in oldentries:
 152             _logger.debug("Forgetting about entry '%s' on inode %i", i, self.inode)
 153             self.inodes.invalidate_entry(self.inode, i.encode(self.inodes.encoding))
 154             self.inodes.del_entry(oldentries[i])
 155             changed = True
 156
 157         if changed:
 158             self.inodes.invalidate_inode(self.inode)
 159             self._mtime = time.time()
 160
 161         self.fresh()
 162
 163     def in_use(self):
 164         if super(Directory, self).in_use():
 165             return True
 166         for v in self._entries.itervalues():
 167             if v.in_use():
 168                 return True
 169         return False
 170
 171     def has_ref(self, only_children):
 172         if super(Directory, self).has_ref(only_children):
 173             return True
 174         for v in self._entries.itervalues():
 175             if v.has_ref(False):
 176                 return True
 177         return False
 178
 179     def clear(self):
 180         """Delete all entries"""
 181         oldentries = self._entries
 182         self._entries = {}
 183         for n in oldentries:
 184             oldentries[n].clear()
 185             self.inodes.invalidate_entry(self.inode, n.encode(self.inodes.encoding))
 186             self.inodes.del_entry(oldentries[n])
 187         self.inodes.invalidate_inode(self.inode)
 188         self.invalidate()
 189
 190     def kernel_invalidate(self):
 191         for n, e in self._entries.iteritems():
 192             self.inodes.invalidate_entry(self.inode, n.encode(self.inodes.encoding))
 193             e.kernel_invalidate()
 194         self.inodes.invalidate_inode(self.inode)
 195
 196     def mtime(self):
 197         return self._mtime
 198
 199     def writable(self):
 200         return False
 201
 202     def flush(self):
 203         pass
 204
 205     def want_event_subscribe(self):
 206         raise NotImplementedError()
 207
 208     def create(self, name):
 209         raise NotImplementedError()
 210
 211     def mkdir(self, name):
 212         raise NotImplementedError()
 213
 214     def unlink(self, name):
 215         raise NotImplementedError()
 216
 217     def rmdir(self, name):
 218         raise NotImplementedError()
 219
 220     def rename(self, name_old, name_new, src):
 221         raise NotImplementedError()
 222
 223
 224 class CollectionDirectoryBase(Directory):
 225     """Represent an Arvados Collection as a directory.
 226
 227     This class is used for Subcollections, and is also the base class for
 228     CollectionDirectory, which implements collection loading/saving on
 229     Collection records.
 230
 231     Most operations act only the underlying Arvados `Collection` object.  The
 232     `Collection` object signals via a notify callback to
 233     `CollectionDirectoryBase.on_event` that an item was added, removed or
 234     modified.  FUSE inodes and directory entries are created, deleted or
 235     invalidated in response to these events.
 236
 237     """
 238
 239     def __init__(self, parent_inode, inodes, collection):
 240         super(CollectionDirectoryBase, self).__init__(parent_inode, inodes)
 241         self.collection = collection
 242
 243     def new_entry(self, name, item, mtime):
 244         name = sanitize_filename(name)
 245         if hasattr(item, "fuse_entry") and item.fuse_entry is not None:
 246             if item.fuse_entry.dead is not True:
 247                 raise Exception("Can only reparent dead inode entry")
 248             if item.fuse_entry.inode is None:
 249                 raise Exception("Reparented entry must still have valid inode")
 250             item.fuse_entry.dead = False
 251             self._entries[name] = item.fuse_entry
 252         elif isinstance(item, arvados.collection.RichCollectionBase):
 253             self._entries[name] = self.inodes.add_entry(CollectionDirectoryBase(self.inode, self.inodes, item))
 254             self._entries[name].populate(mtime)
 255         else:
 256             self._entries[name] = self.inodes.add_entry(FuseArvadosFile(self.inode, item, mtime))
 257         item.fuse_entry = self._entries[name]
 258
 259     def on_event(self, event, collection, name, item):
 260         if collection == self.collection:
 261             name = sanitize_filename(name)
 262             _logger.debug("collection notify %s %s %s %s", event, collection, name, item)
 263             with llfuse.lock:
 264                 if event == arvados.collection.ADD:
 265                     self.new_entry(name, item, self.mtime())
 266                 elif event == arvados.collection.DEL:
 267                     ent = self._entries[name]
 268                     del self._entries[name]
 269                     self.inodes.invalidate_entry(self.inode, name.encode(self.inodes.encoding))
 270                     self.inodes.del_entry(ent)
 271                 elif event == arvados.collection.MOD:
 272                     if hasattr(item, "fuse_entry") and item.fuse_entry is not None:
 273                         self.inodes.invalidate_inode(item.fuse_entry.inode)
 274                     elif name in self._entries:
 275                         self.inodes.invalidate_inode(self._entries[name].inode)
 276
 277     def populate(self, mtime):
 278         self._mtime = mtime
 279         self.collection.subscribe(self.on_event)
 280         for entry, item in self.collection.items():
 281             self.new_entry(entry, item, self.mtime())
 282
 283     def writable(self):
 284         return self.collection.writable()
 285
 286     @use_counter
 287     def flush(self):
 288         with llfuse.lock_released:
 289             self.collection.root_collection().save()
 290
 291     @use_counter
 292     @check_update
 293     def create(self, name):
 294         with llfuse.lock_released:
 295             self.collection.open(name, "w").close()
 296
 297     @use_counter
 298     @check_update
 299     def mkdir(self, name):
 300         with llfuse.lock_released:
 301             self.collection.mkdirs(name)
 302
 303     @use_counter
 304     @check_update
 305     def unlink(self, name):
 306         with llfuse.lock_released:
 307             self.collection.remove(name)
 308         self.flush()
 309
 310     @use_counter
 311     @check_update
 312     def rmdir(self, name):
 313         with llfuse.lock_released:
 314             self.collection.remove(name)
 315         self.flush()
 316
 317     @use_counter
 318     @check_update
 319     def rename(self, name_old, name_new, src):
 320         if not isinstance(src, CollectionDirectoryBase):
 321             raise llfuse.FUSEError(errno.EPERM)
 322
 323         if name_new in self:
 324             ent = src[name_old]
 325             tgt = self[name_new]
 326             if isinstance(ent, FuseArvadosFile) and isinstance(tgt, FuseArvadosFile):
 327                 pass
 328             elif isinstance(ent, CollectionDirectoryBase) and isinstance(tgt, CollectionDirectoryBase):
 329                 if len(tgt) > 0:
 330                     raise llfuse.FUSEError(errno.ENOTEMPTY)
 331             elif isinstance(ent, CollectionDirectoryBase) and isinstance(tgt, FuseArvadosFile):
 332                 raise llfuse.FUSEError(errno.ENOTDIR)
 333             elif isinstance(ent, FuseArvadosFile) and isinstance(tgt, CollectionDirectoryBase):
 334                 raise llfuse.FUSEError(errno.EISDIR)
 335
 336         with llfuse.lock_released:
 337             self.collection.rename(name_old, name_new, source_collection=src.collection, overwrite=True)
 338         self.flush()
 339         src.flush()
 340
 341     def clear(self):
 342         super(CollectionDirectoryBase, self).clear()
 343         self.collection = None
 344
 345
 346 class CollectionDirectory(CollectionDirectoryBase):
 347     """Represents the root of a directory tree representing a collection."""
 348
 349     def __init__(self, parent_inode, inodes, api, num_retries, collection_record=None, explicit_collection=None):
 350         super(CollectionDirectory, self).__init__(parent_inode, inodes, None)
 351         self.api = api
 352         self.num_retries = num_retries
 353         self.collection_record_file = None
 354         self.collection_record = None
 355         self._poll = True
 356         try:
 357             self._poll_time = (api._rootDesc.get('blobSignatureTtl', 60*60*2)/2)
 358         except:
 359             _logger.debug("Error getting blobSignatureTtl from discovery document: %s", sys.exc_info()[0])
 360             self._poll_time = 60*60
 361
 362         if isinstance(collection_record, dict):
 363             self.collection_locator = collection_record['uuid']
 364             self._mtime = convertTime(collection_record.get('modified_at'))
 365         else:
 366             self.collection_locator = collection_record
 367             self._mtime = 0
 368         self._manifest_size = 0
 369         if self.collection_locator:
 370             self._writable = (uuid_pattern.match(self.collection_locator) is not None)
 371         self._updating_lock = threading.Lock()
 372
 373     def same(self, i):
 374         return i['uuid'] == self.collection_locator or i['portable_data_hash'] == self.collection_locator
 375
 376     def writable(self):
 377         return self.collection.writable() if self.collection is not None else self._writable
 378
 379     def want_event_subscribe(self):
 380         return (uuid_pattern.match(self.collection_locator) is not None)
 381
 382     # Used by arv-web.py to switch the contents of the CollectionDirectory
 383     def change_collection(self, new_locator):
 384         """Switch the contents of the CollectionDirectory.
 385
 386         Must be called with llfuse.lock held.
 387         """
 388
 389         self.collection_locator = new_locator
 390         self.collection_record = None
 391         self.update()
 392
 393     def new_collection(self, new_collection_record, coll_reader):
 394         if self.inode:
 395             self.clear()
 396
 397         self.collection_record = new_collection_record
 398
 399         if self.collection_record:
 400             self._mtime = convertTime(self.collection_record.get('modified_at'))
 401             self.collection_locator = self.collection_record["uuid"]
 402             if self.collection_record_file is not None:
 403                 self.collection_record_file.update(self.collection_record)
 404
 405         self.collection = coll_reader
 406         self.populate(self.mtime())
 407
 408     def uuid(self):
 409         return self.collection_locator
 410
 411     @use_counter
 412     def update(self, to_record_version=None):
 413         try:
 414             if self.collection_record is not None and portable_data_hash_pattern.match(self.collection_locator):
 415                 return True
 416
 417             if self.collection_locator is None:
 418                 self.fresh()
 419                 return True
 420
 421             try:
 422                 with llfuse.lock_released:
 423                     self._updating_lock.acquire()
 424                     if not self.stale():
 425                         return
 426
 427                     _logger.debug("Updating collection %s inode %s to record version %s", self.collection_locator, self.inode, to_record_version)
 428                     if self.collection is not None:
 429                         if self.collection.known_past_version(to_record_version):
 430                             _logger.debug("%s already processed %s", self.collection_locator, to_record_version)
 431                         else:
 432                             self.collection.update()
 433                     else:
 434                         if uuid_pattern.match(self.collection_locator):
 435                             coll_reader = arvados.collection.Collection(
 436                                 self.collection_locator, self.api, self.api.keep,
 437                                 num_retries=self.num_retries)
 438                         else:
 439                             coll_reader = arvados.collection.CollectionReader(
 440                                 self.collection_locator, self.api, self.api.keep,
 441                                 num_retries=self.num_retries)
 442                         new_collection_record = coll_reader.api_response() or {}
 443                         # If the Collection only exists in Keep, there will be no API
 444                         # response.  Fill in the fields we need.
 445                         if 'uuid' not in new_collection_record:
 446                             new_collection_record['uuid'] = self.collection_locator
 447                         if "portable_data_hash" not in new_collection_record:
 448                             new_collection_record["portable_data_hash"] = new_collection_record["uuid"]
 449                         if 'manifest_text' not in new_collection_record:
 450                             new_collection_record['manifest_text'] = coll_reader.manifest_text()
 451
 452                         if self.collection_record is None or self.collection_record["portable_data_hash"] != new_collection_record.get("portable_data_hash"):
 453                             self.new_collection(new_collection_record, coll_reader)
 454
 455                         self._manifest_size = len(coll_reader.manifest_text())
 456                         _logger.debug("%s manifest_size %i", self, self._manifest_size)
 457                 # end with llfuse.lock_released, re-acquire lock
 458
 459                 self.fresh()
 460                 return True
 461             finally:
 462                 self._updating_lock.release()
 463         except arvados.errors.NotFoundError as e:
 464             _logger.error("Error fetching collection '%s': %s", self.collection_locator, e)
 465         except arvados.errors.ArgumentError as detail:
 466             _logger.warning("arv-mount %s: error %s", self.collection_locator, detail)
 467             if self.collection_record is not None and "manifest_text" in self.collection_record:
 468                 _logger.warning("arv-mount manifest_text is: %s", self.collection_record["manifest_text"])
 469         except Exception:
 470             _logger.exception("arv-mount %s: error", self.collection_locator)
 471             if self.collection_record is not None and "manifest_text" in self.collection_record:
 472                 _logger.error("arv-mount manifest_text is: %s", self.collection_record["manifest_text"])
 473         self.invalidate()
 474         return False
 475
 476     @use_counter
 477     @check_update
 478     def __getitem__(self, item):
 479         if item == '.arvados#collection':
 480             if self.collection_record_file is None:
 481                 self.collection_record_file = ObjectFile(self.inode, self.collection_record)
 482                 self.inodes.add_entry(self.collection_record_file)
 483             return self.collection_record_file
 484         else:
 485             return super(CollectionDirectory, self).__getitem__(item)
 486
 487     def __contains__(self, k):
 488         if k == '.arvados#collection':
 489             return True
 490         else:
 491             return super(CollectionDirectory, self).__contains__(k)
 492
 493     def invalidate(self):
 494         self.collection_record = None
 495         self.collection_record_file = None
 496         super(CollectionDirectory, self).invalidate()
 497
 498     def persisted(self):
 499         return (self.collection_locator is not None)
 500
 501     def objsize(self):
 502         # This is an empirically-derived heuristic to estimate the memory used
 503         # to store this collection's metadata.  Calculating the memory
 504         # footprint directly would be more accurate, but also more complicated.
 505         return self._manifest_size * 128
 506
 507     def finalize(self):
 508         if self.collection is not None:
 509             if self.writable():
 510                 self.collection.save()
 511             self.collection.stop_threads()
 512
 513     def clear(self):
 514         if self.collection is not None:
 515             self.collection.stop_threads()
 516         super(CollectionDirectory, self).clear()
 517         self._manifest_size = 0
 518
 519
 520 class TmpCollectionDirectory(CollectionDirectoryBase):
 521     """A directory backed by an Arvados collection that never gets saved.
 522
 523     This supports using Keep as scratch space. A userspace program can
 524     read the .arvados#collection file to get a current manifest in
 525     order to save a snapshot of the scratch data or use it as a crunch
 526     job output.
 527     """
 528
 529     class UnsaveableCollection(arvados.collection.Collection):
 530         def save(self):
 531             pass
 532         def save_new(self):
 533             pass
 534
 535     def __init__(self, parent_inode, inodes, api_client, num_retries):
 536         collection = self.UnsaveableCollection(
 537             api_client=api_client,
 538             keep_client=api_client.keep,
 539             num_retries=num_retries)
 540         super(TmpCollectionDirectory, self).__init__(
 541             parent_inode, inodes, collection)
 542         self.collection_record_file = None
 543         self.populate(self.mtime())
 544
 545     def on_event(self, *args, **kwargs):
 546         super(TmpCollectionDirectory, self).on_event(*args, **kwargs)
 547         if self.collection_record_file:
 548             with llfuse.lock:
 549                 self.collection_record_file.invalidate()
 550             self.inodes.invalidate_inode(self.collection_record_file.inode)
 551             _logger.debug("%s invalidated collection record", self)
 552
 553     def collection_record(self):
 554         with llfuse.lock_released:
 555             return {
 556                 "uuid": None,
 557                 "manifest_text": self.collection.manifest_text(),
 558                 "portable_data_hash": self.collection.portable_data_hash(),
 559             }
 560
 561     def __contains__(self, k):
 562         return (k == '.arvados#collection' or
 563                 super(TmpCollectionDirectory, self).__contains__(k))
 564
 565     @use_counter
 566     def __getitem__(self, item):
 567         if item == '.arvados#collection':
 568             if self.collection_record_file is None:
 569                 self.collection_record_file = FuncToJSONFile(
 570                     self.inode, self.collection_record)
 571                 self.inodes.add_entry(self.collection_record_file)
 572             return self.collection_record_file
 573         return super(TmpCollectionDirectory, self).__getitem__(item)
 574
 575     def persisted(self):
 576         return False
 577
 578     def writable(self):
 579         return True
 580
 581     def want_event_subscribe(self):
 582         return False
 583
 584     def finalize(self):
 585         self.collection.stop_threads()
 586
 587     def invalidate(self):
 588         if self.collection_record_file:
 589             self.collection_record_file.invalidate()
 590         super(TmpCollectionDirectory, self).invalidate()
 591
 592
 593 class MagicDirectory(Directory):
 594     """A special directory that logically contains the set of all extant keep locators.
 595
 596     When a file is referenced by lookup(), it is tested to see if it is a valid
 597     keep locator to a manifest, and if so, loads the manifest contents as a
 598     subdirectory of this directory with the locator as the directory name.
 599     Since querying a list of all extant keep locators is impractical, only
 600     collections that have already been accessed are visible to readdir().
 601
 602     """
 603
 604     README_TEXT = """
 605 This directory provides access to Arvados collections as subdirectories listed
 606 by uuid (in the form 'zzzzz-4zz18-1234567890abcde') or portable data hash (in
 607 the form '1234567890abcdef0123456789abcdef+123').
 608
 609 Note that this directory will appear empty until you attempt to access a
 610 specific collection subdirectory (such as trying to 'cd' into it), at which
 611 point the collection will actually be looked up on the server and the directory
 612 will appear if it exists.
 613
 614 """.lstrip()
 615
 616     def __init__(self, parent_inode, inodes, api, num_retries, pdh_only=False):
 617         super(MagicDirectory, self).__init__(parent_inode, inodes)
 618         self.api = api
 619         self.num_retries = num_retries
 620         self.pdh_only = pdh_only
 621
 622     def __setattr__(self, name, value):
 623         super(MagicDirectory, self).__setattr__(name, value)
 624         # When we're assigned an inode, add a README.
 625         if ((name == 'inode') and (self.inode is not None) and
 626               (not self._entries)):
 627             self._entries['README'] = self.inodes.add_entry(
 628                 StringFile(self.inode, self.README_TEXT, time.time()))
 629             # If we're the root directory, add an identical by_id subdirectory.
 630             if self.inode == llfuse.ROOT_INODE:
 631                 self._entries['by_id'] = self.inodes.add_entry(MagicDirectory(
 632                         self.inode, self.inodes, self.api, self.num_retries, self.pdh_only))
 633
 634     def __contains__(self, k):
 635         if k in self._entries:
 636             return True
 637
 638         if not portable_data_hash_pattern.match(k) and (self.pdh_only or not uuid_pattern.match(k)):
 639             return False
 640
 641         try:
 642             e = self.inodes.add_entry(CollectionDirectory(
 643                     self.inode, self.inodes, self.api, self.num_retries, k))
 644
 645             if e.update():
 646                 if k not in self._entries:
 647                     self._entries[k] = e
 648                 else:
 649                     self.inodes.del_entry(e)
 650                 return True
 651             else:
 652                 self.inodes.invalidate_entry(self.inode, k)
 653                 self.inodes.del_entry(e)
 654                 return False
 655         except Exception as ex:
 656             _logger.debug('arv-mount exception keep %s', ex)
 657             self.inodes.del_entry(e)
 658             return False
 659
 660     def __getitem__(self, item):
 661         if item in self:
 662             return self._entries[item]
 663         else:
 664             raise KeyError("No collection with id " + item)
 665
 666     def clear(self):
 667         pass
 668
 669     def want_event_subscribe(self):
 670         return not self.pdh_only
 671
 672
 673 class TagsDirectory(Directory):
 674     """A special directory that contains as subdirectories all tags visible to the user."""
 675
 676     def __init__(self, parent_inode, inodes, api, num_retries, poll_time=60):
 677         super(TagsDirectory, self).__init__(parent_inode, inodes)
 678         self.api = api
 679         self.num_retries = num_retries
 680         self._poll = True
 681         self._poll_time = poll_time
 682
 683     def want_event_subscribe(self):
 684         return True
 685
 686     @use_counter
 687     def update(self):
 688         with llfuse.lock_released:
 689             tags = self.api.links().list(
 690                 filters=[['link_class', '=', 'tag']],
 691                 select=['name'], distinct=True
 692                 ).execute(num_retries=self.num_retries)
 693         if "items" in tags:
 694             self.merge(tags['items'],
 695                        lambda i: i['name'],
 696                        lambda a, i: a.tag == i['name'],
 697                        lambda i: TagDirectory(self.inode, self.inodes, self.api, self.num_retries, i['name'], poll=self._poll, poll_time=self._poll_time))
 698
 699
 700 class TagDirectory(Directory):
 701     """A special directory that contains as subdirectories all collections visible
 702     to the user that are tagged with a particular tag.
 703     """
 704
 705     def __init__(self, parent_inode, inodes, api, num_retries, tag,
 706                  poll=False, poll_time=60):
 707         super(TagDirectory, self).__init__(parent_inode, inodes)
 708         self.api = api
 709         self.num_retries = num_retries
 710         self.tag = tag
 711         self._poll = poll
 712         self._poll_time = poll_time
 713
 714     def want_event_subscribe(self):
 715         return True
 716
 717     @use_counter
 718     def update(self):
 719         with llfuse.lock_released:
 720             taggedcollections = self.api.links().list(
 721                 filters=[['link_class', '=', 'tag'],
 722                          ['name', '=', self.tag],
 723                          ['head_uuid', 'is_a', 'arvados#collection']],
 724                 select=['head_uuid']
 725                 ).execute(num_retries=self.num_retries)
 726         self.merge(taggedcollections['items'],
 727                    lambda i: i['head_uuid'],
 728                    lambda a, i: a.collection_locator == i['head_uuid'],
 729                    lambda i: CollectionDirectory(self.inode, self.inodes, self.api, self.num_retries, i['head_uuid']))
 730
 731
 732 class ProjectDirectory(Directory):
 733     """A special directory that contains the contents of a project."""
 734
 735     def __init__(self, parent_inode, inodes, api, num_retries, project_object,
 736                  poll=False, poll_time=60):
 737         super(ProjectDirectory, self).__init__(parent_inode, inodes)
 738         self.api = api
 739         self.num_retries = num_retries
 740         self.project_object = project_object
 741         self.project_object_file = None
 742         self.project_uuid = project_object['uuid']
 743         self._poll = poll
 744         self._poll_time = poll_time
 745         self._updating_lock = threading.Lock()
 746         self._current_user = None
 747
 748     def want_event_subscribe(self):
 749         return True
 750
 751     def createDirectory(self, i):
 752         if collection_uuid_pattern.match(i['uuid']):
 753             return CollectionDirectory(self.inode, self.inodes, self.api, self.num_retries, i)
 754         elif group_uuid_pattern.match(i['uuid']):
 755             return ProjectDirectory(self.inode, self.inodes, self.api, self.num_retries, i, self._poll, self._poll_time)
 756         elif link_uuid_pattern.match(i['uuid']):
 757             if i['head_kind'] == 'arvados#collection' or portable_data_hash_pattern.match(i['head_uuid']):
 758                 return CollectionDirectory(self.inode, self.inodes, self.api, self.num_retries, i['head_uuid'])
 759             else:
 760                 return None
 761         elif uuid_pattern.match(i['uuid']):
 762             return ObjectFile(self.parent_inode, i)
 763         else:
 764             return None
 765
 766     def uuid(self):
 767         return self.project_uuid
 768
 769     @use_counter
 770     def update(self):
 771         if self.project_object_file == None:
 772             self.project_object_file = ObjectFile(self.inode, self.project_object)
 773             self.inodes.add_entry(self.project_object_file)
 774
 775         def namefn(i):
 776             if 'name' in i:
 777                 if i['name'] is None or len(i['name']) == 0:
 778                     return None
 779                 elif collection_uuid_pattern.match(i['uuid']) or group_uuid_pattern.match(i['uuid']):
 780                     # collection or subproject
 781                     return i['name']
 782                 elif link_uuid_pattern.match(i['uuid']) and i['head_kind'] == 'arvados#collection':
 783                     # name link
 784                     return i['name']
 785                 elif 'kind' in i and i['kind'].startswith('arvados#'):
 786                     # something else
 787                     return "{}.{}".format(i['name'], i['kind'][8:])
 788             else:
 789                 return None
 790
 791         def samefn(a, i):
 792             if isinstance(a, CollectionDirectory) or isinstance(a, ProjectDirectory):
 793                 return a.uuid() == i['uuid']
 794             elif isinstance(a, ObjectFile):
 795                 return a.uuid() == i['uuid'] and not a.stale()
 796             return False
 797
 798         try:
 799             with llfuse.lock_released:
 800                 self._updating_lock.acquire()
 801                 if not self.stale():
 802                     return
 803
 804                 if group_uuid_pattern.match(self.project_uuid):
 805                     self.project_object = self.api.groups().get(
 806                         uuid=self.project_uuid).execute(num_retries=self.num_retries)
 807                 elif user_uuid_pattern.match(self.project_uuid):
 808                     self.project_object = self.api.users().get(
 809                         uuid=self.project_uuid).execute(num_retries=self.num_retries)
 810
 811                 contents = arvados.util.list_all(self.api.groups().contents,
 812                                                  self.num_retries, uuid=self.project_uuid)
 813
 814             # end with llfuse.lock_released, re-acquire lock
 815
 816             self.merge(contents,
 817                        namefn,
 818                        samefn,
 819                        self.createDirectory)
 820         finally:
 821             self._updating_lock.release()
 822
 823     @use_counter
 824     @check_update
 825     def __getitem__(self, item):
 826         if item == '.arvados#project':
 827             return self.project_object_file
 828         else:
 829             return super(ProjectDirectory, self).__getitem__(item)
 830
 831     def __contains__(self, k):
 832         if k == '.arvados#project':
 833             return True
 834         else:
 835             return super(ProjectDirectory, self).__contains__(k)
 836
 837     @use_counter
 838     @check_update
 839     def writable(self):
 840         with llfuse.lock_released:
 841             if not self._current_user:
 842                 self._current_user = self.api.users().current().execute(num_retries=self.num_retries)
 843             return self._current_user["uuid"] in self.project_object["writable_by"]
 844
 845     def persisted(self):
 846         return True
 847
 848     @use_counter
 849     @check_update
 850     def mkdir(self, name):
 851         try:
 852             with llfuse.lock_released:
 853                 self.api.collections().create(body={"owner_uuid": self.project_uuid,
 854                                                     "name": name,
 855                                                     "manifest_text": ""}).execute(num_retries=self.num_retries)
 856             self.invalidate()
 857         except apiclient_errors.Error as error:
 858             _logger.error(error)
 859             raise llfuse.FUSEError(errno.EEXIST)
 860
 861     @use_counter
 862     @check_update
 863     def rmdir(self, name):
 864         if name not in self:
 865             raise llfuse.FUSEError(errno.ENOENT)
 866         if not isinstance(self[name], CollectionDirectory):
 867             raise llfuse.FUSEError(errno.EPERM)
 868         if len(self[name]) > 0:
 869             raise llfuse.FUSEError(errno.ENOTEMPTY)
 870         with llfuse.lock_released:
 871             self.api.collections().delete(uuid=self[name].uuid()).execute(num_retries=self.num_retries)
 872         self.invalidate()
 873
 874     @use_counter
 875     @check_update
 876     def rename(self, name_old, name_new, src):
 877         if not isinstance(src, ProjectDirectory):
 878             raise llfuse.FUSEError(errno.EPERM)
 879
 880         ent = src[name_old]
 881
 882         if not isinstance(ent, CollectionDirectory):
 883             raise llfuse.FUSEError(errno.EPERM)
 884
 885         if name_new in self:
 886             # POSIX semantics for replacing one directory with another is
 887             # tricky (the target directory must be empty, the operation must be
 888             # atomic which isn't possible with the Arvados API as of this
 889             # writing) so don't support that.
 890             raise llfuse.FUSEError(errno.EPERM)
 891
 892         self.api.collections().update(uuid=ent.uuid(),
 893                                       body={"owner_uuid": self.uuid(),
 894                                             "name": name_new}).execute(num_retries=self.num_retries)
 895
 896         # Acually move the entry from source directory to this directory.
 897         del src._entries[name_old]
 898         self._entries[name_new] = ent
 899         self.inodes.invalidate_entry(src.inode, name_old.encode(self.inodes.encoding))
 900
 901
 902 class SharedDirectory(Directory):
 903     """A special directory that represents users or groups who have shared projects with me."""
 904
 905     def __init__(self, parent_inode, inodes, api, num_retries, exclude,
 906                  poll=False, poll_time=60):
 907         super(SharedDirectory, self).__init__(parent_inode, inodes)
 908         self.api = api
 909         self.num_retries = num_retries
 910         self.current_user = api.users().current().execute(num_retries=num_retries)
 911         self._poll = True
 912         self._poll_time = poll_time
 913
 914     @use_counter
 915     def update(self):
 916         with llfuse.lock_released:
 917             all_projects = arvados.util.list_all(
 918                 self.api.groups().list, self.num_retries,
 919                 filters=[['group_class','=','project']])
 920             objects = {}
 921             for ob in all_projects:
 922                 objects[ob['uuid']] = ob
 923
 924             roots = []
 925             root_owners = {}
 926             for ob in all_projects:
 927                 if ob['owner_uuid'] != self.current_user['uuid'] and ob['owner_uuid'] not in objects:
 928                     roots.append(ob)
 929                     root_owners[ob['owner_uuid']] = True
 930
 931             lusers = arvados.util.list_all(
 932                 self.api.users().list, self.num_retries,
 933                 filters=[['uuid','in', list(root_owners)]])
 934             lgroups = arvados.util.list_all(
 935                 self.api.groups().list, self.num_retries,
 936                 filters=[['uuid','in', list(root_owners)]])
 937
 938             users = {}
 939             groups = {}
 940
 941             for l in lusers:
 942                 objects[l["uuid"]] = l
 943             for l in lgroups:
 944                 objects[l["uuid"]] = l
 945
 946             contents = {}
 947             for r in root_owners:
 948                 if r in objects:
 949                     obr = objects[r]
 950                     if obr.get("name"):
 951                         contents[obr["name"]] = obr
 952                     #elif obr.get("username"):
 953                     #    contents[obr["username"]] = obr
 954                     elif "first_name" in obr:
 955                         contents[u"{} {}".format(obr["first_name"], obr["last_name"])] = obr
 956
 957
 958             for r in roots:
 959                 if r['owner_uuid'] not in objects:
 960                     contents[r['name']] = r
 961
 962         # end with llfuse.lock_released, re-acquire lock
 963
 964         try:
 965             self.merge(contents.items(),
 966                        lambda i: i[0],
 967                        lambda a, i: a.uuid() == i[1]['uuid'],
 968                        lambda i: ProjectDirectory(self.inode, self.inodes, self.api, self.num_retries, i[1], poll=self._poll, poll_time=self._poll_time))
 969         except Exception:
 970             _logger.exception()
 971
 972     def want_event_subscribe(self):
 973         return True