def backup_fsync_and_set_sizes(self, backup_info):
"""
Fsync all files in a backup and set the actual size on disk
of a backup.
Also evaluate the deduplication ratio and the deduplicated size if
applicable.
:param barman.infofile.BackupInfo backup_info: the backup to update
"""
# Calculate the base backup size
self.executor.current_action = "calculating backup size"
_logger.debug(self.executor.current_action)
backup_size = 0
deduplicated_size = 0
backup_dest = backup_info.get_basebackup_directory()
for dir_path, _, file_names in os.walk(backup_dest):
# execute fsync() on the containing directory
fsync_dir(dir_path)
# execute fsync() on all the contained files
for filename in file_names:
file_path = os.path.join(dir_path, filename)
file_stat = fsync_file(file_path)
backup_size += file_stat.st_size
# Excludes hard links from real backup size
if file_stat.st_nlink == 1:
deduplicated_size += file_stat.st_size
# Save size into BackupInfo object
backup_info.set_attribute('size', backup_size)
backup_info.set_attribute('deduplicated_size', deduplicated_size)
if backup_info.size > 0:
deduplication_ratio = 1 - (float(
backup_info.deduplicated_size) / backup_info.size)
else:
deduplication_ratio = 0
if self.config.reuse_backup == 'link':
output.info(
"Backup size: %s. Actual size on disk: %s"
" (-%s deduplication ratio)." % (
pretty_size(backup_info.size),
pretty_size(backup_info.deduplicated_size),
'{percent:.2%}'.format(percent=deduplication_ratio)
))
else:
output.info("Backup size: %s" %
pretty_size(backup_info.size))
def archive_wal(self, compressor, wal_info):
"""
Archive a WAL segment and update the wal_info object
:param compressor: the compressor for the file (if any)
:param WalFileInfo wal_info: the WAL file is being processed
"""
src_file = wal_info.orig_filename
src_dir = os.path.dirname(src_file)
dst_file = wal_info.fullpath(self.server)
tmp_file = dst_file + '.tmp'
dst_dir = os.path.dirname(dst_file)
comp_manager = self.backup_manager.compression_manager
error = None
try:
# Run the pre_archive_script if present.
script = HookScriptRunner(self.backup_manager, 'archive_script',
'pre')
script.env_from_wal_info(wal_info, src_file)
script.run()
# Run the pre_archive_retry_script if present.
retry_script = RetryHookScriptRunner(self.backup_manager,
'archive_retry_script', 'pre')
retry_script.env_from_wal_info(wal_info, src_file)
retry_script.run()
# Check if destination already exists
if os.path.exists(dst_file):
src_uncompressed = src_file
dst_uncompressed = dst_file
dst_info = comp_manager.get_wal_file_info(dst_file)
try:
if dst_info.compression is not None:
dst_uncompressed = dst_file + '.uncompressed'
comp_manager \
.get_compressor(dst_info.compression) \
.decompress(dst_file, dst_uncompressed)
if wal_info.compression:
src_uncompressed = src_file + '.uncompressed'
comp_manager \
.get_compressor(wal_info.compression) \
.decompress(src_file, src_uncompressed)
# Directly compare files.
# When the files are identical
# raise a MatchingDuplicateWalFile exception,
# otherwise raise a DuplicateWalFile exception.
if filecmp.cmp(dst_uncompressed, src_uncompressed):
raise MatchingDuplicateWalFile(wal_info)
else:
raise DuplicateWalFile(wal_info)
finally:
if src_uncompressed != src_file:
os.unlink(src_uncompressed)
if dst_uncompressed != dst_file:
os.unlink(dst_uncompressed)
mkpath(dst_dir)
# Compress the file only if not already compressed
if compressor and not wal_info.compression:
compressor.compress(src_file, tmp_file)
# Perform the real filesystem operation with the xlogdb lock taken.
# This makes the operation atomic from the xlogdb file POV
with self.server.xlogdb('a') as fxlogdb:
if compressor and not wal_info.compression:
shutil.copystat(src_file, tmp_file)
os.rename(tmp_file, dst_file)
os.unlink(src_file)
# Update wal_info
stat = os.stat(dst_file)
wal_info.size = stat.st_size
wal_info.compression = compressor.compression
else:
# Try to atomically rename the file. If successful,
# the renaming will be an atomic operation
# (this is a POSIX requirement).
try:
os.rename(src_file, dst_file)
except OSError:
# Source and destination are probably on different
# filesystems
shutil.copy2(src_file, tmp_file)
os.rename(tmp_file, dst_file)
os.unlink(src_file)
# At this point the original file has been removed
wal_info.orig_filename = None
# Execute fsync() on the archived WAL file
fsync_file(dst_file)
# Execute fsync() on the archived WAL containing directory
fsync_dir(dst_dir)
# Execute fsync() also on the incoming directory
fsync_dir(src_dir)
# Updates the information of the WAL archive with
# the latest segments
fxlogdb.write(wal_info.to_xlogdb_line())
# flush and fsync for every line
fxlogdb.flush()
os.fsync(fxlogdb.fileno())
except Exception as e:
# In case of failure save the exception for the post scripts
error = e
raise
# Ensure the execution of the post_archive_retry_script and
# the post_archive_script
finally:
# Run the post_archive_retry_script if present.
try:
retry_script = RetryHookScriptRunner(self,
'archive_retry_script',
'post')
retry_script.env_from_wal_info(wal_info, dst_file, error)
retry_script.run()
except AbortedRetryHookScript as e:
# Ignore the ABORT_STOP as it is a post-hook operation
_logger.warning(
"Ignoring stop request after receiving "
"abort (exit code %d) from post-archive "
"retry hook script: %s", e.hook.exit_status, e.hook.script)
# Run the post_archive_script if present.
script = HookScriptRunner(self, 'archive_script', 'post', error)
script.env_from_wal_info(wal_info, dst_file)
script.run()
