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commit.py
# commit.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 import datetime import re from subprocess import Popen, PIPE from gitdb import IStream from git.util import hex_to_bin, Actor, Stats, finalize_process from git.diff import Diffable from git.cmd import Git from .tree import Tree from . import base from .util import ( Serializable, TraversableIterableObj, parse_date, altz_to_utctz_str, parse_actor_and_date, from_timestamp, ) from time import time, daylight, altzone, timezone, localtime import os from io import BytesIO import logging from collections import defaultdict # typing ------------------------------------------------------------------ from typing import ( Any, IO, Iterator, List, Sequence, Tuple, Union, TYPE_CHECKING, cast, Dict, ) from git.types import PathLike, Literal if TYPE_CHECKING: from git.repo import Repo from git.refs import SymbolicReference # ------------------------------------------------------------------------ log = logging.getLogger("git.objects.commit") log.addHandler(logging.NullHandler()) __all__ = ("Commit",) class Commit(base.Object, TraversableIterableObj, Diffable, Serializable): """Wraps a git Commit object. This class will act lazily on some of its attributes and will query the value on demand only if it involves calling the git binary.""" # ENVIRONMENT VARIABLES # read when creating new commits env_author_date = "GIT_AUTHOR_DATE" env_committer_date = "GIT_COMMITTER_DATE" # CONFIGURATION KEYS conf_encoding = "i18n.commitencoding" # INVARIANTS default_encoding = "UTF-8" # object configuration type: Literal["commit"] = "commit" __slots__ = ( "tree", "author", "authored_date", "author_tz_offset", "committer", "committed_date", "committer_tz_offset", "message", "parents", "encoding", "gpgsig", ) _id_attribute_ = "hexsha" def __init__( self, repo: "Repo", binsha: bytes, tree: Union[Tree, None] = None, author: Union[Actor, None] = None, authored_date: Union[int, None] = None, author_tz_offset: Union[None, float] = None, committer: Union[Actor, None] = None, committed_date: Union[int, None] = None, committer_tz_offset: Union[None, float] = None, message: Union[str, bytes, None] = None, parents: Union[Sequence["Commit"], None] = None, encoding: Union[str, None] = None, gpgsig: Union[str, None] = None, ) -> None: """Instantiate a new Commit. All keyword arguments taking None as default will be implicitly set on first query. :param binsha: 20 byte sha1 :param parents: tuple( Commit, ... ) is a tuple of commit ids or actual Commits :param tree: Tree object :param author: Actor is the author Actor object :param authored_date: int_seconds_since_epoch is the authored DateTime - use time.gmtime() to convert it into a different format :param author_tz_offset: int_seconds_west_of_utc is the timezone that the authored_date is in :param committer: Actor is the committer string :param committed_date: int_seconds_since_epoch is the committed DateTime - use time.gmtime() to convert it into a different format :param committer_tz_offset: int_seconds_west_of_utc is the timezone that the committed_date is in :param message: string is the commit message :param encoding: string encoding of the message, defaults to UTF-8 :param parents: List or tuple of Commit objects which are our parent(s) in the commit dependency graph :return: git.Commit :note: Timezone information is in the same format and in the same sign as what time.altzone returns. The sign is inverted compared to git's UTC timezone.""" super(Commit, self).__init__(repo, binsha) self.binsha = binsha if tree is not None: assert isinstance(tree, Tree), "Tree needs to be a Tree instance, was %s" % type(tree) if tree is not None: self.tree = tree if author is not None: self.author = author if authored_date is not None: self.authored_date = authored_date if author_tz_offset is not None: self.author_tz_offset = author_tz_offset if committer is not None: self.committer = committer if committed_date is not None: self.committed_date = committed_date if committer_tz_offset is not None: self.committer_tz_offset = committer_tz_offset if message is not None: self.message = message if parents is not None: self.parents = parents if encoding is not None: self.encoding = encoding if gpgsig is not None: self.gpgsig = gpgsig @classmethod def _get_intermediate_items(cls, commit: "Commit") -> Tuple["Commit", ...]: return tuple(commit.parents) @classmethod def _calculate_sha_(cls, repo: "Repo", commit: "Commit") -> bytes: """Calculate the sha of a commit. :param repo: Repo object the commit should be part of :param commit: Commit object for which to generate the sha """ stream = BytesIO() commit._serialize(stream) streamlen = stream.tell() stream.seek(0) istream = repo.odb.store(IStream(cls.type, streamlen, stream)) return istream.binsha def replace(self, **kwargs: Any) -> "Commit": """Create new commit object from existing commit object. Any values provided as keyword arguments will replace the corresponding attribute in the new object. """ attrs = {k: getattr(self, k) for k in self.__slots__} for attrname in kwargs: if attrname not in self.__slots__: raise ValueError("invalid attribute name") attrs.update(kwargs) new_commit = self.__class__(self.repo, self.NULL_BIN_SHA, **attrs) new_commit.binsha = self._calculate_sha_(self.repo, new_commit) return new_commit def _set_cache_(self, attr: str) -> None: if attr in Commit.__slots__: # read the data in a chunk, its faster - then provide a file wrapper _binsha, _typename, self.size, stream = self.repo.odb.stream(self.binsha) self._deserialize(BytesIO(stream.read())) else: super(Commit, self)._set_cache_(attr) # END handle attrs @property def authored_datetime(self) -> datetime.datetime: return from_timestamp(self.authored_date, self.author_tz_offset) @property def committed_datetime(self) -> datetime.datetime: return from_timestamp(self.committed_date, self.committer_tz_offset) @property def summary(self) -> Union[str, bytes]: """:return: First line of the commit message""" if isinstance(self.message, str): return self.message.split("\n", 1)[0] else: return self.message.split(b"\n", 1)[0] def count(self, paths: Union[PathLike, Sequence[PathLike]] = "", **kwargs: Any) -> int: """Count the number of commits reachable from this commit :param paths: is an optional path or a list of paths restricting the return value to commits actually containing the paths :param kwargs: Additional options to be passed to git-rev-list. They must not alter the output style of the command, or parsing will yield incorrect results :return: int defining the number of reachable commits""" # yes, it makes a difference whether empty paths are given or not in our case # as the empty paths version will ignore merge commits for some reason. if paths: return len(self.repo.git.rev_list(self.hexsha, "--", paths, **kwargs).splitlines()) return len(self.repo.git.rev_list(self.hexsha, **kwargs).splitlines()) @property def name_rev(self) -> str: """ :return: String describing the commits hex sha based on the closest Reference. Mostly useful for UI purposes""" return self.repo.git.name_rev(self) @classmethod def iter_items( cls, repo: "Repo", rev: Union[str, "Commit", "SymbolicReference"], # type: ignore paths: Union[PathLike, Sequence[PathLike]] = "", **kwargs: Any, ) -> Iterator["Commit"]: """Find all commits matching the given criteria. :param repo: is the Repo :param rev: revision specifier, see git-rev-parse for viable options :param paths: is an optional path or list of paths, if set only Commits that include the path or paths will be considered :param kwargs: optional keyword arguments to git rev-list where ``max_count`` is the maximum number of commits to fetch ``skip`` is the number of commits to skip ``since`` all commits since i.e. '1970-01-01' :return: iterator yielding Commit items""" if "pretty" in kwargs: raise ValueError("--pretty cannot be used as parsing expects single sha's only") # END handle pretty # use -- in any case, to prevent possibility of ambiguous arguments # see https://github.com/gitpython-developers/GitPython/issues/264 args_list: List[PathLike] = ["--"] if paths: paths_tup: Tuple[PathLike, ...] if isinstance(paths, (str, os.PathLike)): paths_tup = (paths,) else: paths_tup = tuple(paths) args_list.extend(paths_tup) # END if paths proc = repo.git.rev_list(rev, args_list, as_process=True, **kwargs) return cls._iter_from_process_or_stream(repo, proc) def iter_parents(self, paths: Union[PathLike, Sequence[PathLike]] = "", **kwargs: Any) -> Iterator["Commit"]: """Iterate _all_ parents of this commit. :param paths: Optional path or list of paths limiting the Commits to those that contain at least one of the paths :param kwargs: All arguments allowed by git-rev-list :return: Iterator yielding Commit objects which are parents of self""" # skip ourselves skip = kwargs.get("skip", 1) if skip == 0: # skip ourselves skip = 1 kwargs["skip"] = skip return self.iter_items(self.repo, self, paths, **kwargs) @property def stats(self) -> Stats: """Create a git stat from changes between this commit and its first parent or from all changes done if this is the very first commit. :return: git.Stats""" if not self.parents: text = self.repo.git.diff_tree(self.hexsha, "--", numstat=True, no_renames=True, root=True) text2 = "" for line in text.splitlines()[1:]: (insertions, deletions, filename) = line.split("\t") text2 += "%s\t%s\t%s\n" % (insertions, deletions, filename) text = text2 else: text = self.repo.git.diff(self.parents[0].hexsha, self.hexsha, "--", numstat=True, no_renames=True) return Stats._list_from_string(self.repo, text) @property def trailers(self) -> Dict[str, str]: """Get the trailers of the message as a dictionary :note: This property is deprecated, please use either ``Commit.trailers_list`` or ``Commit.trailers_dict``. :return: Dictionary containing whitespace stripped trailer information. Only contains the latest instance of each trailer key. """ return { k: v[0] for k, v in self.trailers_dict.items() } @property def trailers_list(self) -> List[Tuple[str, str]]: """Get the trailers of the message as a list Git messages can contain trailer information that are similar to RFC 822 e-mail headers (see: https://git-scm.com/docs/git-interpret-trailers). This functions calls ``git interpret-trailers --parse`` onto the message to extract the trailer information, returns the raw trailer data as a list. Valid message with trailer:: Subject line some body information another information key1: value1.1 key1: value1.2 key2 : value 2 with inner spaces Returned list will look like this:: [ ("key1", "value1.1"), ("key1", "value1.2"), ("key2", "value 2 with inner spaces"), ] :return: List containing key-value tuples of whitespace stripped trailer information. """ cmd = ["git", "interpret-trailers", "--parse"] proc: Git.AutoInterrupt = self.repo.git.execute(cmd, as_process=True, istream=PIPE) # type: ignore trailer: str = proc.communicate(str(self.message).encode())[0].decode("utf8") trailer = trailer.strip() if not trailer: return [] trailer_list = [] for t in trailer.split("\n"): key, val = t.split(":", 1) trailer_list.append((key.strip(), val.strip())) return trailer_list @property def trailers_dict(self) -> Dict[str, List[str]]: """Get the trailers of the message as a dictionary Git messages can contain trailer information that are similar to RFC 822 e-mail headers (see: https://git-scm.com/docs/git-interpret-trailers). This functions calls ``git interpret-trailers --parse`` onto the message to extract the trailer information. The key value pairs are stripped of leading and trailing whitespaces before they get saved into a dictionary. Valid message with trailer:: Subject line some body information another information key1: value1.1 key1: value1.2 key2 : value 2 with inner spaces Returned dictionary will look like this:: { "key1": ["value1.1", "value1.2"], "key2": ["value 2 with inner spaces"], } :return: Dictionary containing whitespace stripped trailer information. Mapping trailer keys to a list of their corresponding values. """ d = defaultdict(list) for key, val in self.trailers_list: d[key].append(val) return dict(d) @classmethod def _iter_from_process_or_stream(cls, repo: "Repo", proc_or_stream: Union[Popen, IO]) -> Iterator["Commit"]: """Parse out commit information into a list of Commit objects We expect one-line per commit, and parse the actual commit information directly from our lighting fast object database :param proc: git-rev-list process instance - one sha per line :return: iterator returning Commit objects""" # def is_proc(inp) -> TypeGuard[Popen]: # return hasattr(proc_or_stream, 'wait') and not hasattr(proc_or_stream, 'readline') # def is_stream(inp) -> TypeGuard[IO]: # return hasattr(proc_or_stream, 'readline') if hasattr(proc_or_stream, "wait"): proc_or_stream = cast(Popen, proc_or_stream) if proc_or_stream.stdout is not None: stream = proc_or_stream.stdout elif hasattr(proc_or_stream, "readline"): proc_or_stream = cast(IO, proc_or_stream) stream = proc_or_stream readline = stream.readline while True: line = readline() if not line: break hexsha = line.strip() if len(hexsha) > 40: # split additional information, as returned by bisect for instance hexsha, _ = line.split(None, 1) # END handle extra info assert len(hexsha) == 40, "Invalid line: %s" % hexsha yield cls(repo, hex_to_bin(hexsha)) # END for each line in stream # TODO: Review this - it seems process handling got a bit out of control # due to many developers trying to fix the open file handles issue if hasattr(proc_or_stream, "wait"): proc_or_stream = cast(Popen, proc_or_stream) finalize_process(proc_or_stream) @classmethod def create_from_tree( cls, repo: "Repo", tree: Union[Tree, str], message: str, parent_commits: Union[None, List["Commit"]] = None, head: bool = False, author: Union[None, Actor] = None, committer: Union[None, Actor] = None, author_date: Union[None, str, datetime.datetime] = None, commit_date: Union[None, str, datetime.datetime] = None, ) -> "Commit": """Commit the given tree, creating a commit object. :param repo: Repo object the commit should be part of :param tree: Tree object or hex or bin sha the tree of the new commit :param message: Commit message. It may be an empty string if no message is provided. It will be converted to a string , in any case. :param parent_commits: Optional Commit objects to use as parents for the new commit. If empty list, the commit will have no parents at all and become a root commit. If None , the current head commit will be the parent of the new commit object :param head: If True, the HEAD will be advanced to the new commit automatically. Else the HEAD will remain pointing on the previous commit. This could lead to undesired results when diffing files. :param author: The name of the author, optional. If unset, the repository configuration is used to obtain this value. :param committer: The name of the committer, optional. If unset, the repository configuration is used to obtain this value. :param author_date: The timestamp for the author field :param commit_date: The timestamp for the committer field :return: Commit object representing the new commit :note: Additional information about the committer and Author are taken from the environment or from the git configuration, see git-commit-tree for more information""" if parent_commits is None: try: parent_commits = [repo.head.commit] except ValueError: # empty repositories have no head commit parent_commits = [] # END handle parent commits else: for p in parent_commits: if not isinstance(p, cls): raise ValueError(f"Parent commit '{p!r}' must be of type {cls}") # end check parent commit types # END if parent commits are unset # retrieve all additional information, create a commit object, and # serialize it # Generally: # * Environment variables override configuration values # * Sensible defaults are set according to the git documentation # COMMITTER AND AUTHOR INFO cr = repo.config_reader() env = os.environ committer = committer or Actor.committer(cr) author = author or Actor.author(cr) # PARSE THE DATES unix_time = int(time()) is_dst = daylight and localtime().tm_isdst > 0 offset = altzone if is_dst else timezone author_date_str = env.get(cls.env_author_date, "") if author_date: author_time, author_offset = parse_date(author_date) elif author_date_str: author_time, author_offset = parse_date(author_date_str) else: author_time, author_offset = unix_time, offset # END set author time committer_date_str = env.get(cls.env_committer_date, "") if commit_date: committer_time, committer_offset = parse_date(commit_date) elif committer_date_str: committer_time, committer_offset = parse_date(committer_date_str) else: committer_time, committer_offset = unix_time, offset # END set committer time # assume utf8 encoding enc_section, enc_option = cls.conf_encoding.split(".") conf_encoding = cr.get_value(enc_section, enc_option, cls.default_encoding) if not isinstance(conf_encoding, str): raise TypeError("conf_encoding could not be coerced to str") # if the tree is no object, make sure we create one - otherwise # the created commit object is invalid if isinstance(tree, str): tree = repo.tree(tree) # END tree conversion # CREATE NEW COMMIT new_commit = cls( repo, cls.NULL_BIN_SHA, tree, author, author_time, author_offset, committer, committer_time, committer_offset, message, parent_commits, conf_encoding, ) new_commit.binsha = cls._calculate_sha_(repo, new_commit) if head: # need late import here, importing git at the very beginning throws # as well ... import git.refs try: repo.head.set_commit(new_commit, logmsg=message) except ValueError: # head is not yet set to the ref our HEAD points to # Happens on first commit master = git.refs.Head.create( repo, repo.head.ref, new_commit, logmsg="commit (initial): %s" % message, ) repo.head.set_reference(master, logmsg="commit: Switching to %s" % master) # END handle empty repositories # END advance head handling return new_commit # { Serializable Implementation def _serialize(self, stream: BytesIO) -> "Commit": write = stream.write write(("tree %s\n" % self.tree).encode("ascii")) for p in self.parents: write(("parent %s\n" % p).encode("ascii")) a = self.author aname = a.name c = self.committer fmt = "%s %s <%s> %s %s\n" write( ( fmt % ( "author", aname, a.email, self.authored_date, altz_to_utctz_str(self.author_tz_offset), ) ).encode(self.encoding) ) # encode committer aname = c.name write( ( fmt % ( "committer", aname, c.email, self.committed_date, altz_to_utctz_str(self.committer_tz_offset), ) ).encode(self.encoding) ) if self.encoding != self.default_encoding: write(("encoding %s\n" % self.encoding).encode("ascii")) try: if self.__getattribute__("gpgsig"): write(b"gpgsig") for sigline in self.gpgsig.rstrip("\n").split("\n"): write((" " + sigline + "\n").encode("ascii")) except AttributeError: pass write(b"\n") # write plain bytes, be sure its encoded according to our encoding if isinstance(self.message, str): write(self.message.encode(self.encoding)) else: write(self.message) # END handle encoding return self def _deserialize(self, stream: BytesIO) -> "Commit": """ :param from_rev_list: if true, the stream format is coming from the rev-list command Otherwise it is assumed to be a plain data stream from our object """ readline = stream.readline self.tree = Tree(self.repo, hex_to_bin(readline().split()[1]), Tree.tree_id << 12, "") self.parents = [] next_line = None while True: parent_line = readline() if not parent_line.startswith(b"parent"): next_line = parent_line break # END abort reading parents self.parents.append(type(self)(self.repo, hex_to_bin(parent_line.split()[-1].decode("ascii")))) # END for each parent line self.parents = tuple(self.parents) # we don't know actual author encoding before we have parsed it, so keep the lines around author_line = next_line committer_line = readline() # we might run into one or more mergetag blocks, skip those for now next_line = readline() while next_line.startswith(b"mergetag "): next_line = readline() while next_line.startswith(b" "): next_line = readline() # end skip mergetags # now we can have the encoding line, or an empty line followed by the optional # message. self.encoding = self.default_encoding self.gpgsig = "" # read headers enc = next_line buf = enc.strip() while buf: if buf[0:10] == b"encoding ": self.encoding = buf[buf.find(b" ") + 1 :].decode(self.encoding, "ignore") elif buf[0:7] == b"gpgsig ": sig = buf[buf.find(b" ") + 1 :] + b"\n" is_next_header = False while True: sigbuf = readline() if not sigbuf: break if sigbuf[0:1] != b" ": buf = sigbuf.strip() is_next_header = True break sig += sigbuf[1:] # end read all signature self.gpgsig = sig.rstrip(b"\n").decode(self.encoding, "ignore") if is_next_header: continue buf = readline().strip() # decode the authors name try: ( self.author, self.authored_date, self.author_tz_offset, ) = parse_actor_and_date(author_line.decode(self.encoding, "replace")) except UnicodeDecodeError: log.error( "Failed to decode author line '%s' using encoding %s", author_line, self.encoding, exc_info=True, ) try: ( self.committer, self.committed_date, self.committer_tz_offset, ) = parse_actor_and_date(committer_line.decode(self.encoding, "replace")) except UnicodeDecodeError: log.error( "Failed to decode committer line '%s' using encoding %s", committer_line, self.encoding, exc_info=True, ) # END handle author's encoding # a stream from our data simply gives us the plain message # The end of our message stream is marked with a newline that we strip self.message = stream.read() try: self.message = self.message.decode(self.encoding, "replace") except UnicodeDecodeError: log.error( "Failed to decode message '%s' using encoding %s", self.message, self.encoding, exc_info=True, ) # END exception handling return self # } END serializable implementation @property def co_authors(self) -> List[Actor]: """ Search the commit message for any co-authors of this commit. Details on co-authors: https://github.blog/2018-01-29-commit-together-with-co-authors/ :return: List of co-authors for this commit (as Actor objects). """ co_authors = [] if self.message: results = re.findall( r"^Co-authored-by: (.*) <(.*?)>$", self.message, re.MULTILINE, ) for author in results: co_authors.append(Actor(*author)) return co_authors
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