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base.py
# base.py # Copyright (C) 2008, 2009 Michael Trier (mtrier@gmail.com) and contributors # # This module is part of GitPython and is released under # the BSD License: http://www.opensource.org/licenses/bsd-license.php from git.exc import WorkTreeRepositoryUnsupported from git.util import LazyMixin, join_path_native, stream_copy, bin_to_hex import gitdb.typ as dbtyp import os.path as osp from .util import get_object_type_by_name # typing ------------------------------------------------------------------ from typing import Any, TYPE_CHECKING, Union from git.types import PathLike, Commit_ish, Lit_commit_ish if TYPE_CHECKING: from git.repo import Repo from gitdb.base import OStream from .tree import Tree from .blob import Blob from .submodule.base import Submodule from git.refs.reference import Reference IndexObjUnion = Union["Tree", "Blob", "Submodule"] # -------------------------------------------------------------------------- _assertion_msg_format = "Created object %r whose python type %r disagrees with the actual git object type %r" __all__ = ("Object", "IndexObject") class Object(LazyMixin): """Implements an Object which may be Blobs, Trees, Commits and Tags""" NULL_HEX_SHA = "0" * 40 NULL_BIN_SHA = b"\0" * 20 TYPES = ( dbtyp.str_blob_type, dbtyp.str_tree_type, dbtyp.str_commit_type, dbtyp.str_tag_type, ) __slots__ = ("repo", "binsha", "size") type: Union[Lit_commit_ish, None] = None def __init__(self, repo: "Repo", binsha: bytes): """Initialize an object by identifying it by its binary sha. All keyword arguments will be set on demand if None. :param repo: repository this object is located in :param binsha: 20 byte SHA1""" super(Object, self).__init__() self.repo = repo self.binsha = binsha assert len(binsha) == 20, "Require 20 byte binary sha, got %r, len = %i" % ( binsha, len(binsha), ) @classmethod def new(cls, repo: "Repo", id: Union[str, "Reference"]) -> Commit_ish: """ :return: New Object instance of a type appropriate to the object type behind id. The id of the newly created object will be a binsha even though the input id may have been a Reference or Rev-Spec :param id: reference, rev-spec, or hexsha :note: This cannot be a __new__ method as it would always call __init__ with the input id which is not necessarily a binsha.""" return repo.rev_parse(str(id)) @classmethod def new_from_sha(cls, repo: "Repo", sha1: bytes) -> Commit_ish: """ :return: new object instance of a type appropriate to represent the given binary sha1 :param sha1: 20 byte binary sha1""" if sha1 == cls.NULL_BIN_SHA: # the NULL binsha is always the root commit return get_object_type_by_name(b"commit")(repo, sha1) # END handle special case oinfo = repo.odb.info(sha1) inst = get_object_type_by_name(oinfo.type)(repo, oinfo.binsha) inst.size = oinfo.size return inst def _set_cache_(self, attr: str) -> None: """Retrieve object information""" if attr == "size": oinfo = self.repo.odb.info(self.binsha) self.size = oinfo.size # type: int # assert oinfo.type == self.type, _assertion_msg_format % (self.binsha, oinfo.type, self.type) else: super(Object, self)._set_cache_(attr) def __eq__(self, other: Any) -> bool: """:return: True if the objects have the same SHA1""" if not hasattr(other, "binsha"): return False return self.binsha == other.binsha def __ne__(self, other: Any) -> bool: """:return: True if the objects do not have the same SHA1""" if not hasattr(other, "binsha"): return True return self.binsha != other.binsha def __hash__(self) -> int: """:return: Hash of our id allowing objects to be used in dicts and sets""" return hash(self.binsha) def __str__(self) -> str: """:return: string of our SHA1 as understood by all git commands""" return self.hexsha def __repr__(self) -> str: """:return: string with pythonic representation of our object""" return '<git.%s "%s">' % (self.__class__.__name__, self.hexsha) @property def hexsha(self) -> str: """:return: 40 byte hex version of our 20 byte binary sha""" # b2a_hex produces bytes return bin_to_hex(self.binsha).decode("ascii") @property def data_stream(self) -> "OStream": """:return: File Object compatible stream to the uncompressed raw data of the object :note: returned streams must be read in order""" return self.repo.odb.stream(self.binsha) def stream_data(self, ostream: "OStream") -> "Object": """Writes our data directly to the given output stream :param ostream: File object compatible stream object. :return: self""" istream = self.repo.odb.stream(self.binsha) stream_copy(istream, ostream) return self class IndexObject(Object): """Base for all objects that can be part of the index file , namely Tree, Blob and SubModule objects""" __slots__ = ("path", "mode") # for compatibility with iterable lists _id_attribute_ = "path" def __init__( self, repo: "Repo", binsha: bytes, mode: Union[None, int] = None, path: Union[None, PathLike] = None, ) -> None: """Initialize a newly instanced IndexObject :param repo: is the Repo we are located in :param binsha: 20 byte sha1 :param mode: is the stat compatible file mode as int, use the stat module to evaluate the information :param path: is the path to the file in the file system, relative to the git repository root, i.e. file.ext or folder/other.ext :note: Path may not be set of the index object has been created directly as it cannot be retrieved without knowing the parent tree.""" super(IndexObject, self).__init__(repo, binsha) if mode is not None: self.mode = mode if path is not None: self.path = path def __hash__(self) -> int: """ :return: Hash of our path as index items are uniquely identifiable by path, not by their data !""" return hash(self.path) def _set_cache_(self, attr: str) -> None: if attr in IndexObject.__slots__: # they cannot be retrieved lateron ( not without searching for them ) raise AttributeError( "Attribute '%s' unset: path and mode attributes must have been set during %s object creation" % (attr, type(self).__name__) ) else: super(IndexObject, self)._set_cache_(attr) # END handle slot attribute @property def name(self) -> str: """:return: Name portion of the path, effectively being the basename""" return osp.basename(self.path) @property def abspath(self) -> PathLike: """ :return: Absolute path to this index object in the file system ( as opposed to the .path field which is a path relative to the git repository ). The returned path will be native to the system and contains '\' on windows.""" if self.repo.working_tree_dir is not None: return join_path_native(self.repo.working_tree_dir, self.path) else: raise WorkTreeRepositoryUnsupported("Working_tree_dir was None or empty")
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