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258 lines (222 loc) · 7.89 KB
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# Copyright (C) 2010, 2011 Sebastian Thiel (byronimo@gmail.com) and contributors
#
# This module is part of GitDB and is released under
# the New BSD License: http://www.opensource.org/licenses/bsd-license.php
from gitdb.db.base import (
FileDBBase,
ObjectDBR,
ObjectDBW
)
from gitdb.exc import (
BadObject,
AmbiguousObjectName
)
from gitdb.stream import (
DecompressMemMapReader,
FDCompressedSha1Writer,
FDStream,
Sha1Writer
)
from gitdb.base import (
OStream,
OInfo
)
from gitdb.util import (
file_contents_ro_filepath,
ENOENT,
hex_to_bin,
bin_to_hex,
exists,
chmod,
isdir,
isfile,
remove,
mkdir,
rename,
dirname,
basename,
join
)
from gitdb.fun import (
chunk_size,
loose_object_header_info,
write_object,
stream_copy
)
from gitdb.utils.encoding import force_bytes
import tempfile
import os
import sys
__all__ = ('LooseObjectDB', )
class LooseObjectDB(FileDBBase, ObjectDBR, ObjectDBW):
"""A database which operates on loose object files"""
# CONFIGURATION
# chunks in which data will be copied between streams
stream_chunk_size = chunk_size
# On windows we need to keep it writable, otherwise it cannot be removed
# either
new_objects_mode = int("444", 8)
if os.name == 'nt':
new_objects_mode = int("644", 8)
def __init__(self, root_path):
super().__init__(root_path)
self._hexsha_to_file = dict()
# Additional Flags - might be set to 0 after the first failure
# Depending on the root, this might work for some mounts, for others not, which
# is why it is per instance
self._fd_open_flags = getattr(os, 'O_NOATIME', 0)
#{ Interface
def object_path(self, hexsha):
"""
:return: path at which the object with the given hexsha would be stored,
relative to the database root"""
return join(hexsha[:2], hexsha[2:])
def readable_db_object_path(self, hexsha):
"""
:return: readable object path to the object identified by hexsha
:raise BadObject: If the object file does not exist"""
try:
return self._hexsha_to_file[hexsha]
except KeyError:
pass
# END ignore cache misses
# try filesystem
path = self.db_path(self.object_path(hexsha))
if exists(path):
self._hexsha_to_file[hexsha] = path
return path
# END handle cache
raise BadObject(hexsha)
def partial_to_complete_sha_hex(self, partial_hexsha):
""":return: 20 byte binary sha1 string which matches the given name uniquely
:param name: hexadecimal partial name (bytes or ascii string)
:raise AmbiguousObjectName:
:raise BadObject: """
candidate = None
for binsha in self.sha_iter():
if bin_to_hex(binsha).startswith(force_bytes(partial_hexsha)):
# it can't ever find the same object twice
if candidate is not None:
raise AmbiguousObjectName(partial_hexsha)
candidate = binsha
# END for each object
if candidate is None:
raise BadObject(partial_hexsha)
return candidate
#} END interface
def _map_loose_object(self, sha):
"""
:return: memory map of that file to allow random read access
:raise BadObject: if object could not be located"""
db_path = self.db_path(self.object_path(bin_to_hex(sha)))
try:
return file_contents_ro_filepath(db_path, flags=self._fd_open_flags)
except OSError as e:
if e.errno != ENOENT:
# try again without noatime
try:
return file_contents_ro_filepath(db_path)
except OSError as new_e:
raise BadObject(sha) from new_e
# didn't work because of our flag, don't try it again
self._fd_open_flags = 0
else:
raise BadObject(sha) from e
# END handle error
# END exception handling
def set_ostream(self, stream):
""":raise TypeError: if the stream does not support the Sha1Writer interface"""
if stream is not None and not isinstance(stream, Sha1Writer):
raise TypeError("Output stream musst support the %s interface" % Sha1Writer.__name__)
return super().set_ostream(stream)
def info(self, sha):
m = self._map_loose_object(sha)
try:
typ, size = loose_object_header_info(m)
return OInfo(sha, typ, size)
finally:
if hasattr(m, 'close'):
m.close()
# END assure release of system resources
def stream(self, sha):
m = self._map_loose_object(sha)
type, size, stream = DecompressMemMapReader.new(m, close_on_deletion=True)
return OStream(sha, type, size, stream)
def has_object(self, sha):
try:
self.readable_db_object_path(bin_to_hex(sha))
return True
except BadObject:
return False
# END check existence
def store(self, istream):
"""note: The sha we produce will be hex by nature"""
tmp_path = None
writer = self.ostream()
if writer is None:
# open a tmp file to write the data to
fd, tmp_path = tempfile.mkstemp(prefix='obj', dir=self._root_path)
if istream.binsha is None:
writer = FDCompressedSha1Writer(fd)
else:
writer = FDStream(fd)
# END handle direct stream copies
# END handle custom writer
try:
try:
if istream.binsha is not None:
# copy as much as possible, the actual uncompressed item size might
# be smaller than the compressed version
stream_copy(istream.read, writer.write, sys.maxsize, self.stream_chunk_size)
else:
# write object with header, we have to make a new one
write_object(istream.type, istream.size, istream.read, writer.write,
chunk_size=self.stream_chunk_size)
# END handle direct stream copies
finally:
if tmp_path:
writer.close()
# END assure target stream is closed
except:
if tmp_path:
os.remove(tmp_path)
raise
# END assure tmpfile removal on error
hexsha = None
if istream.binsha:
hexsha = istream.hexsha
else:
hexsha = writer.sha(as_hex=True)
# END handle sha
if tmp_path:
obj_path = self.db_path(self.object_path(hexsha))
obj_dir = dirname(obj_path)
if not isdir(obj_dir):
mkdir(obj_dir)
# END handle destination directory
# rename onto existing doesn't work on NTFS
if isfile(obj_path):
remove(tmp_path)
else:
rename(tmp_path, obj_path)
# end rename only if needed
# make sure its readable for all ! It started out as rw-- tmp file
# but needs to be rwrr
chmod(obj_path, self.new_objects_mode)
# END handle dry_run
istream.binsha = hex_to_bin(hexsha)
return istream
def sha_iter(self):
# find all files which look like an object, extract sha from there
for root, dirs, files in os.walk(self.root_path()):
root_base = basename(root)
if len(root_base) != 2:
continue
for f in files:
if len(f) != 38:
continue
yield hex_to_bin(root_base + f)
# END for each file
# END for each walk iteration
def size(self):
return len(tuple(self.sha_iter()))