mirror of https://github.com/borgbackup/borg.git
570 lines
16 KiB
Python
570 lines
16 KiB
Python
import argparse
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import binascii
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import grp
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import msgpack
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import os
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import pwd
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import re
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import stat
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import sys
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import time
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from datetime import datetime, timezone, timedelta
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from fnmatch import translate
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from operator import attrgetter
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import fcntl
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import attic.hashindex
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import attic.chunker
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import attic.crypto
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class Error(Exception):
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"""Error base class"""
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exit_code = 1
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def get_message(self):
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return 'Error: ' + type(self).__doc__.format(*self.args)
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class ExtensionModuleError(Error):
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"""The Attic binary extension modules does not seem to be properly installed"""
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class UpgradableLock:
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class ReadLockFailed(Error):
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"""Failed to acquire read lock on {}"""
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class WriteLockFailed(Error):
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"""Failed to acquire write lock on {}"""
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def __init__(self, path, exclusive=False):
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self.path = path
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try:
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self.fd = open(path, 'r+')
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except IOError:
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self.fd = open(path, 'r')
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try:
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if exclusive:
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fcntl.lockf(self.fd, fcntl.LOCK_EX)
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else:
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fcntl.lockf(self.fd, fcntl.LOCK_SH)
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# Python 3.2 raises IOError, Python3.3+ raises OSError
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except (IOError, OSError):
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if exclusive:
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raise self.WriteLockFailed(self.path)
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else:
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raise self.ReadLockFailed(self.path)
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self.is_exclusive = exclusive
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def upgrade(self):
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try:
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fcntl.lockf(self.fd, fcntl.LOCK_EX)
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# Python 3.2 raises IOError, Python3.3+ raises OSError
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except (IOError, OSError):
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raise self.WriteLockFailed(self.path)
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self.is_exclusive = True
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def release(self):
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fcntl.lockf(self.fd, fcntl.LOCK_UN)
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self.fd.close()
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def check_extension_modules():
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import attic.platform
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if (attic.hashindex.API_VERSION != 2 or
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attic.chunker.API_VERSION != 2 or
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attic.crypto.API_VERSION != 2 or
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attic.platform.API_VERSION != 2):
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raise ExtensionModuleError
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class Manifest:
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MANIFEST_ID = b'\0' * 32
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def __init__(self, key, repository):
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self.archives = {}
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self.config = {}
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self.key = key
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self.repository = repository
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@classmethod
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def load(cls, repository, key=None):
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from .key import key_factory
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cdata = repository.get(cls.MANIFEST_ID)
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if not key:
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key = key_factory(repository, cdata)
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manifest = cls(key, repository)
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data = key.decrypt(None, cdata)
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manifest.id = key.id_hash(data)
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m = msgpack.unpackb(data)
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if not m.get(b'version') == 1:
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raise ValueError('Invalid manifest version')
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manifest.archives = dict((k.decode('utf-8'), v) for k,v in m[b'archives'].items())
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manifest.timestamp = m.get(b'timestamp')
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if manifest.timestamp:
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manifest.timestamp = manifest.timestamp.decode('ascii')
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manifest.config = m[b'config']
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return manifest, key
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def write(self):
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self.timestamp = datetime.utcnow().isoformat()
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data = msgpack.packb(StableDict({
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'version': 1,
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'archives': self.archives,
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'timestamp': self.timestamp,
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'config': self.config,
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}))
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self.id = self.key.id_hash(data)
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self.repository.put(self.MANIFEST_ID, self.key.encrypt(data))
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def prune_within(archives, within):
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multiplier = {'H': 1, 'd': 24, 'w': 24*7, 'm': 24*31, 'y': 24*365}
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try:
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hours = int(within[:-1]) * multiplier[within[-1]]
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except (KeyError, ValueError):
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# I don't like how this displays the original exception too:
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raise argparse.ArgumentTypeError('Unable to parse --within option: "%s"' % within)
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if hours <= 0:
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raise argparse.ArgumentTypeError('Number specified using --within option must be positive')
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target = datetime.now(timezone.utc) - timedelta(seconds=hours*60*60)
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return [a for a in archives if a.ts > target]
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def prune_split(archives, pattern, n, skip=[]):
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last = None
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keep = []
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if n == 0:
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return keep
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for a in sorted(archives, key=attrgetter('ts'), reverse=True):
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period = to_localtime(a.ts).strftime(pattern)
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if period != last:
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last = period
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if a not in skip:
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keep.append(a)
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if len(keep) == n: break
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return keep
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class Statistics:
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def __init__(self):
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self.osize = self.csize = self.usize = self.nfiles = 0
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def update(self, size, csize, unique):
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self.osize += size
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self.csize += csize
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if unique:
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self.usize += csize
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def print_(self, label, cache):
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total_size, total_csize, unique_size, unique_csize = cache.chunks.summarize()
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print()
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print(' Original size Compressed size Deduplicated size')
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print('%-15s %20s %20s %20s' % (label, format_file_size(self.osize), format_file_size(self.csize), format_file_size(self.usize)))
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print('All archives: %20s %20s %20s' % (format_file_size(total_size), format_file_size(total_csize), format_file_size(unique_csize)))
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def get_keys_dir():
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"""Determine where to repository keys and cache"""
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return os.environ.get('ATTIC_KEYS_DIR',
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os.path.join(os.path.expanduser('~'), '.attic', 'keys'))
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def get_cache_dir():
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"""Determine where to repository keys and cache"""
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return os.environ.get('ATTIC_CACHE_DIR',
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os.path.join(os.path.expanduser('~'), '.cache', 'attic'))
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def to_localtime(ts):
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"""Convert datetime object from UTC to local time zone"""
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return datetime(*time.localtime((ts - datetime(1970, 1, 1, tzinfo=timezone.utc)).total_seconds())[:6])
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def update_excludes(args):
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"""Merge exclude patterns from files with those on command line.
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Empty lines and lines starting with '#' are ignored, but whitespace
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is not stripped."""
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if hasattr(args, 'exclude_files') and args.exclude_files:
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if not hasattr(args, 'excludes') or args.excludes is None:
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args.excludes = []
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for file in args.exclude_files:
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patterns = [line.rstrip('\r\n') for line in file if not line.startswith('#')]
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args.excludes += [ExcludePattern(pattern) for pattern in patterns if pattern]
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file.close()
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def adjust_patterns(paths, excludes):
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if paths:
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return (excludes or []) + [IncludePattern(path) for path in paths] + [ExcludePattern('*')]
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else:
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return excludes
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def exclude_path(path, patterns):
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"""Used by create and extract sub-commands to determine
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whether or not an item should be processed.
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"""
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for pattern in (patterns or []):
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if pattern.match(path):
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return isinstance(pattern, ExcludePattern)
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return False
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# For both IncludePattern and ExcludePattern, we require that
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# the pattern either match the whole path or an initial segment
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# of the path up to but not including a path separator. To
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# unify the two cases, we add a path separator to the end of
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# the path before matching.
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class IncludePattern:
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"""Literal files or directories listed on the command line
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for some operations (e.g. extract, but not create).
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If a directory is specified, all paths that start with that
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path match as well. A trailing slash makes no difference.
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"""
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def __init__(self, pattern):
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self.pattern = pattern.rstrip(os.path.sep)+os.path.sep
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def match(self, path):
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return (path+os.path.sep).startswith(self.pattern)
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def __repr__(self):
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return '%s(%s)' % (type(self), self.pattern)
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class ExcludePattern(IncludePattern):
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"""Shell glob patterns to exclude. A trailing slash means to
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exclude the contents of a directory, but not the directory itself.
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"""
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def __init__(self, pattern):
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if pattern.endswith(os.path.sep):
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self.pattern = pattern+'*'+os.path.sep
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else:
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self.pattern = pattern+os.path.sep+'*'
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# fnmatch and re.match both cache compiled regular expressions.
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# Nevertheless, this is about 10 times faster.
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self.regex = re.compile(translate(self.pattern))
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def match(self, path):
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return self.regex.match(path+os.path.sep) is not None
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def __repr__(self):
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return '%s(%s)' % (type(self), self.pattern)
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def is_cachedir(path):
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"""Determines whether the specified path is a cache directory (and
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therefore should potentially be excluded from the backup) according to
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the CACHEDIR.TAG protocol
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(http://www.brynosaurus.com/cachedir/spec.html).
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"""
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tag_contents = b'Signature: 8a477f597d28d172789f06886806bc55'
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tag_path = os.path.join(path, 'CACHEDIR.TAG')
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try:
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if os.path.exists(tag_path):
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with open(tag_path, 'rb') as tag_file:
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tag_data = tag_file.read(len(tag_contents))
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if tag_data == tag_contents:
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return True
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except OSError:
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pass
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return False
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def format_time(t):
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"""Format datetime suitable for fixed length list output
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"""
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if abs((datetime.now() - t).days) < 365:
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return t.strftime('%b %d %H:%M')
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else:
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return t.strftime('%b %d %Y')
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def format_timedelta(td):
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"""Format timedelta in a human friendly format
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"""
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# Since td.total_seconds() requires python 2.7
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ts = (td.microseconds + (td.seconds + td.days * 24 * 3600) * 10 ** 6) / float(10 ** 6)
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s = ts % 60
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m = int(ts / 60) % 60
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h = int(ts / 3600) % 24
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txt = '%.2f seconds' % s
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if m:
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txt = '%d minutes %s' % (m, txt)
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if h:
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txt = '%d hours %s' % (h, txt)
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if td.days:
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txt = '%d days %s' % (td.days, txt)
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return txt
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def format_file_mode(mod):
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"""Format file mode bits for list output
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"""
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def x(v):
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return ''.join(v & m and s or '-'
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for m, s in ((4, 'r'), (2, 'w'), (1, 'x')))
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return '%s%s%s' % (x(mod // 64), x(mod // 8), x(mod))
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def format_file_size(v):
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"""Format file size into a human friendly format
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"""
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if abs(v) > 10**12:
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return '%.2f TB' % (v / 10**12)
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elif abs(v) > 10**9:
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return '%.2f GB' % (v / 10**9)
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elif abs(v) > 10**6:
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return '%.2f MB' % (v / 10**6)
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elif abs(v) > 10**3:
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return '%.2f kB' % (v / 10**3)
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else:
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return '%d B' % v
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def format_archive(archive):
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return '%-36s %s' % (archive.name, to_localtime(archive.ts).strftime('%c'))
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class IntegrityError(Error):
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"""Data integrity error"""
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def memoize(function):
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cache = {}
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def decorated_function(*args):
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try:
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return cache[args]
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except KeyError:
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val = function(*args)
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cache[args] = val
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return val
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return decorated_function
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@memoize
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def uid2user(uid, default=None):
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try:
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return pwd.getpwuid(uid).pw_name
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except KeyError:
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return default
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@memoize
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def user2uid(user, default=None):
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try:
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return user and pwd.getpwnam(user).pw_uid
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except KeyError:
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return default
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@memoize
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def gid2group(gid, default=None):
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try:
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return grp.getgrgid(gid).gr_name
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except KeyError:
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return default
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@memoize
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def group2gid(group, default=None):
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try:
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return group and grp.getgrnam(group).gr_gid
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except KeyError:
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return default
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def posix_acl_use_stored_uid_gid(acl):
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"""Replace the user/group field with the stored uid/gid
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"""
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entries = []
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for entry in acl.decode('ascii').split('\n'):
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if entry:
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fields = entry.split(':')
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if len(fields) == 4:
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entries.append(':'.join([fields[0], fields[3], fields[2]]))
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else:
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entries.append(entry)
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return ('\n'.join(entries)).encode('ascii')
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class Location:
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"""Object representing a repository / archive location
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"""
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proto = user = host = port = path = archive = None
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ssh_re = re.compile(r'(?P<proto>ssh)://(?:(?P<user>[^@]+)@)?'
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r'(?P<host>[^:/#]+)(?::(?P<port>\d+))?'
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r'(?P<path>[^:]+)(?:::(?P<archive>.+))?$')
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file_re = re.compile(r'(?P<proto>file)://'
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r'(?P<path>[^:]+)(?:::(?P<archive>.+))?$')
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scp_re = re.compile(r'((?:(?P<user>[^@]+)@)?(?P<host>[^:/]+):)?'
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r'(?P<path>[^:]+)(?:::(?P<archive>.+))?$')
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def __init__(self, text):
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self.orig = text
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if not self.parse(text):
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raise ValueError
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def parse(self, text):
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m = self.ssh_re.match(text)
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if m:
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self.proto = m.group('proto')
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self.user = m.group('user')
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self.host = m.group('host')
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self.port = m.group('port') and int(m.group('port')) or None
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self.path = m.group('path')
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self.archive = m.group('archive')
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return True
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m = self.file_re.match(text)
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if m:
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self.proto = m.group('proto')
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self.path = m.group('path')
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self.archive = m.group('archive')
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return True
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m = self.scp_re.match(text)
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if m:
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self.user = m.group('user')
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self.host = m.group('host')
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self.path = m.group('path')
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self.archive = m.group('archive')
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self.proto = self.host and 'ssh' or 'file'
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return True
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return False
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def __str__(self):
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items = []
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items.append('proto=%r' % self.proto)
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items.append('user=%r' % self.user)
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items.append('host=%r' % self.host)
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items.append('port=%r' % self.port)
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items.append('path=%r' % self.path)
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items.append('archive=%r' % self.archive)
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return ', '.join(items)
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def to_key_filename(self):
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name = re.sub('[^\w]', '_', self.path).strip('_')
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if self.proto != 'file':
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name = self.host + '__' + name
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return os.path.join(get_keys_dir(), name)
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def __repr__(self):
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return "Location(%s)" % self
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def location_validator(archive=None):
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def validator(text):
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try:
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loc = Location(text)
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except ValueError:
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raise argparse.ArgumentTypeError('Invalid location format: "%s"' % text)
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if archive is True and not loc.archive:
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raise argparse.ArgumentTypeError('"%s": No archive specified' % text)
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elif archive is False and loc.archive:
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raise argparse.ArgumentTypeError('"%s" No archive can be specified' % text)
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return loc
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return validator
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def read_msgpack(filename):
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with open(filename, 'rb') as fd:
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return msgpack.unpack(fd)
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def write_msgpack(filename, d):
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with open(filename + '.tmp', 'wb') as fd:
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msgpack.pack(d, fd)
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fd.flush()
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os.fsync(fd)
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os.rename(filename + '.tmp', filename)
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def decode_dict(d, keys, encoding='utf-8', errors='surrogateescape'):
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for key in keys:
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if isinstance(d.get(key), bytes):
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d[key] = d[key].decode(encoding, errors)
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return d
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def remove_surrogates(s, errors='replace'):
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"""Replace surrogates generated by fsdecode with '?'
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"""
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return s.encode('utf-8', errors).decode('utf-8')
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_safe_re = re.compile('^((..)?/+)+')
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def make_path_safe(path):
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"""Make path safe by making it relative and local
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"""
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return _safe_re.sub('', path) or '.'
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def daemonize():
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"""Detach process from controlling terminal and run in background
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"""
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pid = os.fork()
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if pid:
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os._exit(0)
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os.setsid()
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pid = os.fork()
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if pid:
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os._exit(0)
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os.chdir('/')
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os.close(0)
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os.close(1)
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os.close(2)
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fd = os.open('/dev/null', os.O_RDWR)
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os.dup2(fd, 0)
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os.dup2(fd, 1)
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os.dup2(fd, 2)
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class StableDict(dict):
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"""A dict subclass with stable items() ordering"""
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def items(self):
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return sorted(super(StableDict, self).items())
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if sys.version < '3.3':
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# st_mtime_ns attribute only available in 3.3+
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def st_mtime_ns(st):
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return int(st.st_mtime * 1e9)
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# unhexlify in < 3.3 incorrectly only accepts bytes input
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def unhexlify(data):
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if isinstance(data, str):
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data = data.encode('ascii')
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return binascii.unhexlify(data)
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else:
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def st_mtime_ns(st):
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return st.st_mtime_ns
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unhexlify = binascii.unhexlify
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def bigint_to_int(mtime):
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"""Convert bytearray to int
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"""
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if isinstance(mtime, bytes):
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return int.from_bytes(mtime, 'little', signed=True)
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return mtime
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def int_to_bigint(value):
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"""Convert integers larger than 64 bits to bytearray
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Smaller integers are left alone
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"""
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if value.bit_length() > 63:
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return value.to_bytes((value.bit_length() + 9) // 8, 'little', signed=True)
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return value
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