mirror of https://github.com/borgbackup/borg.git
102 lines
4.4 KiB
Python
102 lines
4.4 KiB
Python
# this set must be kept complete, otherwise the RobustUnpacker might malfunction:
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ITEM_KEYS = frozenset(['path', 'source', 'rdev', 'chunks', 'chunks_healthy', 'hardlink_master',
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'mode', 'user', 'group', 'uid', 'gid', 'mtime', 'atime', 'ctime', 'birthtime', 'size',
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'xattrs', 'bsdflags', 'acl_nfs4', 'acl_access', 'acl_default', 'acl_extended',
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'part'])
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# this is the set of keys that are always present in items:
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REQUIRED_ITEM_KEYS = frozenset(['path', 'mtime', ])
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# this set must be kept complete, otherwise rebuild_manifest might malfunction:
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ARCHIVE_KEYS = frozenset(['version', 'name', 'items', 'cmdline', 'hostname', 'username', 'time', 'time_end',
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'comment', 'chunker_params',
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'recreate_cmdline',
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'recreate_source_id', 'recreate_args', 'recreate_partial_chunks', # used in 1.1.0b1 .. b2
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'size', 'csize', 'nfiles', 'size_parts', 'csize_parts', 'nfiles_parts', ])
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# this is the set of keys that are always present in archives:
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REQUIRED_ARCHIVE_KEYS = frozenset(['version', 'name', 'items', 'cmdline', 'time', ])
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# default umask, overridden by --umask, defaults to read/write only for owner
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UMASK_DEFAULT = 0o077
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CACHE_TAG_NAME = 'CACHEDIR.TAG'
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CACHE_TAG_CONTENTS = b'Signature: 8a477f597d28d172789f06886806bc55'
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# A large, but not unreasonably large segment size. Always less than 2 GiB (for legacy file systems). We choose
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# 500 MiB which means that no indirection from the inode is needed for typical Linux file systems.
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# Note that this is a soft-limit and can be exceeded (worst case) by a full maximum chunk size and some metadata
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# bytes. That's why it's 500 MiB instead of 512 MiB.
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DEFAULT_MAX_SEGMENT_SIZE = 500 * 1024 * 1024
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# 20 MiB minus 41 bytes for a Repository header (because the "size" field in the Repository includes
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# the header, and the total size was set to 20 MiB).
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MAX_DATA_SIZE = 20971479
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# MAX_OBJECT_SIZE = <20 MiB (MAX_DATA_SIZE) + 41 bytes for a Repository PUT header, which consists of
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# a 1 byte tag ID, 4 byte CRC, 4 byte size and 32 bytes for the ID.
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MAX_OBJECT_SIZE = MAX_DATA_SIZE + 41 # see LoggedIO.put_header_fmt.size assertion in repository module
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assert MAX_OBJECT_SIZE == 20 * 1024 * 1024
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# repo config max_segment_size value must be below this limit to stay within uint32 offsets:
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MAX_SEGMENT_SIZE_LIMIT = 2 ** 32 - MAX_OBJECT_SIZE
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# borg.remote read() buffer size
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BUFSIZE = 10 * 1024 * 1024
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# to use a safe, limited unpacker, we need to set a upper limit to the archive count in the manifest.
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# this does not mean that you can always really reach that number, because it also needs to be less than
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# MAX_DATA_SIZE or it will trigger the check for that.
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MAX_ARCHIVES = 400000
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# repo.list() / .scan() result count limit the borg client uses
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LIST_SCAN_LIMIT = 100000
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DEFAULT_SEGMENTS_PER_DIR = 1000
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FD_MAX_AGE = 4 * 60 # 4 minutes
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CHUNK_MIN_EXP = 19 # 2**19 == 512kiB
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CHUNK_MAX_EXP = 23 # 2**23 == 8MiB
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HASH_WINDOW_SIZE = 0xfff # 4095B
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HASH_MASK_BITS = 21 # results in ~2MiB chunks statistically
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# chunker algorithms
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CH_BUZHASH = 'buzhash'
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CH_FIXED = 'fixed'
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# defaults, use --chunker-params to override
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CHUNKER_PARAMS = (CH_BUZHASH, CHUNK_MIN_EXP, CHUNK_MAX_EXP, HASH_MASK_BITS, HASH_WINDOW_SIZE)
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# chunker params for the items metadata stream, finer granularity
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ITEMS_CHUNKER_PARAMS = (CH_BUZHASH, 15, 19, 17, HASH_WINDOW_SIZE)
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# operating mode of the files cache (for fast skipping of unchanged files)
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DEFAULT_FILES_CACHE_MODE_UI = 'ctime,size,inode'
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DEFAULT_FILES_CACHE_MODE = 'cis' # == CacheMode(DEFAULT_FILES_CACHE_MODE_UI)
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# return codes returned by borg command
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# when borg is killed by signal N, rc = 128 + N
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EXIT_SUCCESS = 0 # everything done, no problems
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EXIT_WARNING = 1 # reached normal end of operation, but there were issues
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EXIT_ERROR = 2 # terminated abruptly, did not reach end of operation
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# never use datetime.isoformat(), it is evil. always use one of these:
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# datetime.strftime(ISO_FORMAT) # output always includes .microseconds
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# datetime.strftime(ISO_FORMAT_NO_USECS) # output never includes microseconds
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ISO_FORMAT_NO_USECS = '%Y-%m-%dT%H:%M:%S'
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ISO_FORMAT = ISO_FORMAT_NO_USECS + '.%f'
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DASHES = '-' * 78
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PBKDF2_ITERATIONS = 100000
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REPOSITORY_README = """This is a Borg Backup repository.
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See https://borgbackup.readthedocs.io/
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"""
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CACHE_README = """This is a Borg Backup cache.
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See https://borgbackup.readthedocs.io/
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"""
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