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FilesystemObjectProcessors.process_file: clean up orphaned chunks in case of exceptions
Note: no changes inside the indented block, just added the try and the except block.
This commit is contained in:
Thomas Waldmann
parent
f1981715e4
commit
d0c61bbbf1
1 changed files with 82 additions and 68 deletions
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@ -1451,76 +1451,90 @@ class FilesystemObjectProcessors:
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# so it can be extracted / accessed in FUSE mount like a regular file.
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# this needs to be done early, so that part files also get the patched mode.
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item.mode = stat.S_IFREG | stat.S_IMODE(item.mode)
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if hl_chunks is not None: # create_helper gave us chunks from a previous hardlink
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item.chunks = []
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for chunk_id, chunk_size in hl_chunks:
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# process one-by-one, so we will know in item.chunks how far we got
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chunk_entry = cache.chunk_incref(chunk_id, self.stats)
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item.chunks.append(chunk_entry)
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else: # normal case, no "2nd+" hardlink
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if not is_special_file:
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hashed_path = safe_encode(os.path.join(self.cwd, path))
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started_hashing = time.monotonic()
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path_hash = self.key.id_hash(hashed_path)
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self.stats.hashing_time += time.monotonic() - started_hashing
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known, ids = cache.file_known_and_unchanged(hashed_path, path_hash, st)
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else:
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# in --read-special mode, we may be called for special files.
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# there should be no information in the cache about special files processed in
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# read-special mode, but we better play safe as this was wrong in the past:
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hashed_path = path_hash = None
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known, ids = False, None
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if ids is not None:
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# Make sure all ids are available
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for id_ in ids:
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if not cache.seen_chunk(id_):
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# cache said it is unmodified, but we lost a chunk: process file like modified
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status = "M"
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break
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# we begin processing chunks now (writing or incref'ing them to the repository),
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# which might require cleanup (see except-branch):
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try:
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if hl_chunks is not None: # create_helper gave us chunks from a previous hardlink
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item.chunks = []
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for chunk_id, chunk_size in hl_chunks:
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# process one-by-one, so we will know in item.chunks how far we got
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chunk_entry = cache.chunk_incref(chunk_id, self.stats)
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item.chunks.append(chunk_entry)
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else: # normal case, no "2nd+" hardlink
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if not is_special_file:
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hashed_path = safe_encode(os.path.join(self.cwd, path))
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started_hashing = time.monotonic()
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path_hash = self.key.id_hash(hashed_path)
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self.stats.hashing_time += time.monotonic() - started_hashing
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known, ids = cache.file_known_and_unchanged(hashed_path, path_hash, st)
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else:
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item.chunks = []
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for chunk_id in ids:
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# process one-by-one, so we will know in item.chunks how far we got
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chunk_entry = cache.chunk_incref(chunk_id, self.stats)
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item.chunks.append(chunk_entry)
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status = "U" # regular file, unchanged
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else:
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status = "M" if known else "A" # regular file, modified or added
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self.print_file_status(status, path)
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self.stats.files_stats[status] += 1
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status = None # we already printed the status
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# Only chunkify the file if needed
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if "chunks" not in item:
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with backup_io("read"):
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self.process_file_chunks(
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item,
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cache,
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self.stats,
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self.show_progress,
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backup_io_iter(self.chunker.chunkify(None, fd)),
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)
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self.stats.chunking_time = self.chunker.chunking_time
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if is_win32:
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changed_while_backup = False # TODO
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# in --read-special mode, we may be called for special files.
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# there should be no information in the cache about special files processed in
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# read-special mode, but we better play safe as this was wrong in the past:
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hashed_path = path_hash = None
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known, ids = False, None
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if ids is not None:
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# Make sure all ids are available
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for id_ in ids:
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if not cache.seen_chunk(id_):
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# cache said it is unmodified, but we lost a chunk: process file like modified
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status = "M"
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break
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else:
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item.chunks = []
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for chunk_id in ids:
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# process one-by-one, so we will know in item.chunks how far we got
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chunk_entry = cache.chunk_incref(chunk_id, self.stats)
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item.chunks.append(chunk_entry)
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status = "U" # regular file, unchanged
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else:
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with backup_io("fstat2"):
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st2 = os.fstat(fd)
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# special files:
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# - fifos change naturally, because they are fed from the other side. no problem.
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# - blk/chr devices don't change ctime anyway.
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changed_while_backup = not is_special_file and st.st_ctime_ns != st2.st_ctime_ns
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if changed_while_backup:
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status = "C" # regular file changed while we backed it up, might be inconsistent/corrupt!
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if not is_special_file and not changed_while_backup:
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# we must not memorize special files, because the contents of e.g. a
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# block or char device will change without its mtime/size/inode changing.
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# also, we must not memorize a potentially inconsistent/corrupt file that
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# changed while we backed it up.
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cache.memorize_file(hashed_path, path_hash, st, [c.id for c in item.chunks])
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self.stats.nfiles += 1
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item.update(self.metadata_collector.stat_ext_attrs(st, path, fd=fd))
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item.get_size(memorize=True)
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return status
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status = "M" if known else "A" # regular file, modified or added
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self.print_file_status(status, path)
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self.stats.files_stats[status] += 1
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status = None # we already printed the status
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# Only chunkify the file if needed
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if "chunks" not in item:
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with backup_io("read"):
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self.process_file_chunks(
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item,
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cache,
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self.stats,
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self.show_progress,
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backup_io_iter(self.chunker.chunkify(None, fd)),
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)
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self.stats.chunking_time = self.chunker.chunking_time
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if is_win32:
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changed_while_backup = False # TODO
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else:
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with backup_io("fstat2"):
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st2 = os.fstat(fd)
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# special files:
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# - fifos change naturally, because they are fed from the other side. no problem.
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# - blk/chr devices don't change ctime anyway.
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changed_while_backup = not is_special_file and st.st_ctime_ns != st2.st_ctime_ns
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if changed_while_backup:
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# regular file changed while we backed it up, might be inconsistent/corrupt!
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status = "C"
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if not is_special_file and not changed_while_backup:
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# we must not memorize special files, because the contents of e.g. a
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# block or char device will change without its mtime/size/inode changing.
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# also, we must not memorize a potentially inconsistent/corrupt file that
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# changed while we backed it up.
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cache.memorize_file(hashed_path, path_hash, st, [c.id for c in item.chunks])
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self.stats.nfiles += 1
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item.update(self.metadata_collector.stat_ext_attrs(st, path, fd=fd))
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item.get_size(memorize=True)
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return status
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except BackupOSError:
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# Something went wrong and we might need to clean up a bit.
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# Maybe we have already incref'ed some file content chunks in the repo -
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# but we will not add an item (see add_item in create_helper) and thus
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# they would be orphaned chunks in case that we commit the transaction.
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for chunk in item.get("chunks", []):
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cache.chunk_decref(chunk.id, self.stats, wait=False)
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# Now that we have cleaned up the chunk references, we can re-raise the exception.
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# This will skip processing of this file, but might retry or continue with the next one.
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raise
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class TarfileObjectProcessors:
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