mirror of
https://github.com/thegeeklab/ansible-later.git
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263 lines
8.1 KiB
Python
263 lines
8.1 KiB
Python
# Copyright (C) 2010, 2011 Sebastian Thiel (byronimo@gmail.com) and contributors
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#
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# This module is part of GitDB and is released under
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# the New BSD License: http://www.opensource.org/licenses/bsd-license.php
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from gitdb.db.base import (
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FileDBBase,
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ObjectDBR,
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ObjectDBW
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)
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from gitdb.exc import (
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BadObject,
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AmbiguousObjectName
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)
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from gitdb.stream import (
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DecompressMemMapReader,
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FDCompressedSha1Writer,
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FDStream,
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Sha1Writer
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)
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from gitdb.base import (
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OStream,
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OInfo
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)
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from gitdb.util import (
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file_contents_ro_filepath,
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ENOENT,
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hex_to_bin,
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bin_to_hex,
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exists,
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chmod,
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isdir,
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isfile,
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remove,
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mkdir,
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rename,
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dirname,
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basename,
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join
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)
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from gitdb.fun import (
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chunk_size,
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loose_object_header_info,
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write_object,
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stream_copy
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)
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from gitdb.utils.compat import MAXSIZE
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from gitdb.utils.encoding import force_bytes
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import tempfile
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import os
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__all__ = ('LooseObjectDB', )
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class LooseObjectDB(FileDBBase, ObjectDBR, ObjectDBW):
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"""A database which operates on loose object files"""
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# CONFIGURATION
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# chunks in which data will be copied between streams
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stream_chunk_size = chunk_size
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# On windows we need to keep it writable, otherwise it cannot be removed
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# either
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new_objects_mode = int("444", 8)
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if os.name == 'nt':
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new_objects_mode = int("644", 8)
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def __init__(self, root_path):
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super(LooseObjectDB, self).__init__(root_path)
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self._hexsha_to_file = dict()
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# Additional Flags - might be set to 0 after the first failure
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# Depending on the root, this might work for some mounts, for others not, which
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# is why it is per instance
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self._fd_open_flags = getattr(os, 'O_NOATIME', 0)
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#{ Interface
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def object_path(self, hexsha):
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"""
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:return: path at which the object with the given hexsha would be stored,
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relative to the database root"""
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return join(hexsha[:2], hexsha[2:])
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def readable_db_object_path(self, hexsha):
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"""
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:return: readable object path to the object identified by hexsha
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:raise BadObject: If the object file does not exist"""
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try:
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return self._hexsha_to_file[hexsha]
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except KeyError:
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pass
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# END ignore cache misses
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# try filesystem
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path = self.db_path(self.object_path(hexsha))
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if exists(path):
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self._hexsha_to_file[hexsha] = path
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return path
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# END handle cache
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raise BadObject(hexsha)
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def partial_to_complete_sha_hex(self, partial_hexsha):
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""":return: 20 byte binary sha1 string which matches the given name uniquely
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:param name: hexadecimal partial name (bytes or ascii string)
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:raise AmbiguousObjectName:
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:raise BadObject: """
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candidate = None
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for binsha in self.sha_iter():
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if bin_to_hex(binsha).startswith(force_bytes(partial_hexsha)):
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# it can't ever find the same object twice
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if candidate is not None:
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raise AmbiguousObjectName(partial_hexsha)
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candidate = binsha
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# END for each object
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if candidate is None:
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raise BadObject(partial_hexsha)
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return candidate
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#} END interface
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def _map_loose_object(self, sha):
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"""
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:return: memory map of that file to allow random read access
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:raise BadObject: if object could not be located"""
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db_path = self.db_path(self.object_path(bin_to_hex(sha)))
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try:
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return file_contents_ro_filepath(db_path, flags=self._fd_open_flags)
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except OSError as e:
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if e.errno != ENOENT:
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# try again without noatime
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try:
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return file_contents_ro_filepath(db_path)
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except OSError:
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raise BadObject(sha)
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# didn't work because of our flag, don't try it again
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self._fd_open_flags = 0
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else:
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raise BadObject(sha)
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# END handle error
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# END exception handling
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def set_ostream(self, stream):
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""":raise TypeError: if the stream does not support the Sha1Writer interface"""
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if stream is not None and not isinstance(stream, Sha1Writer):
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raise TypeError("Output stream musst support the %s interface" % Sha1Writer.__name__)
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return super(LooseObjectDB, self).set_ostream(stream)
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def info(self, sha):
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m = self._map_loose_object(sha)
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try:
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typ, size = loose_object_header_info(m)
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return OInfo(sha, typ, size)
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finally:
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if hasattr(m, 'close'):
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m.close()
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# END assure release of system resources
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def stream(self, sha):
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m = self._map_loose_object(sha)
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type, size, stream = DecompressMemMapReader.new(m, close_on_deletion=True)
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return OStream(sha, type, size, stream)
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def has_object(self, sha):
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try:
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self.readable_db_object_path(bin_to_hex(sha))
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return True
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except BadObject:
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return False
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# END check existence
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def store(self, istream):
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"""note: The sha we produce will be hex by nature"""
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tmp_path = None
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writer = self.ostream()
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if writer is None:
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# open a tmp file to write the data to
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fd, tmp_path = tempfile.mkstemp(prefix='obj', dir=self._root_path)
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if istream.binsha is None:
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writer = FDCompressedSha1Writer(fd)
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else:
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writer = FDStream(fd)
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# END handle direct stream copies
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# END handle custom writer
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try:
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try:
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if istream.binsha is not None:
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# copy as much as possible, the actual uncompressed item size might
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# be smaller than the compressed version
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stream_copy(istream.read, writer.write, MAXSIZE, self.stream_chunk_size)
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else:
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# write object with header, we have to make a new one
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write_object(istream.type, istream.size, istream.read, writer.write,
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chunk_size=self.stream_chunk_size)
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# END handle direct stream copies
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finally:
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if tmp_path:
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writer.close()
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# END assure target stream is closed
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except:
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if tmp_path:
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os.remove(tmp_path)
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raise
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# END assure tmpfile removal on error
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hexsha = None
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if istream.binsha:
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hexsha = istream.hexsha
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else:
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hexsha = writer.sha(as_hex=True)
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# END handle sha
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if tmp_path:
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obj_path = self.db_path(self.object_path(hexsha))
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obj_dir = dirname(obj_path)
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if not isdir(obj_dir):
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mkdir(obj_dir)
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# END handle destination directory
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# rename onto existing doesn't work on windows
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if os.name == 'nt':
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if isfile(obj_path):
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remove(tmp_path)
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else:
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rename(tmp_path, obj_path)
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# end rename only if needed
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else:
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rename(tmp_path, obj_path)
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# END handle win32
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# make sure its readable for all ! It started out as rw-- tmp file
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# but needs to be rwrr
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chmod(obj_path, self.new_objects_mode)
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# END handle dry_run
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istream.binsha = hex_to_bin(hexsha)
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return istream
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def sha_iter(self):
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# find all files which look like an object, extract sha from there
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for root, dirs, files in os.walk(self.root_path()):
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root_base = basename(root)
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if len(root_base) != 2:
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continue
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for f in files:
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if len(f) != 38:
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continue
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yield hex_to_bin(root_base + f)
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# END for each file
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# END for each walk iteration
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def size(self):
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return len(tuple(self.sha_iter()))
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