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# 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