# 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

from gitdb import IStream

from gitdb.util import hex_to_bin

from git.util import (

Actor,

Iterable,

Stats,

finalize_process

)

from git.diff import Diffable

from .tree import Tree

from . import base

from .util import (

Traversable,

Serializable,

parse_date,

altz_to_utctz_str,

parse_actor_and_date

)

from git.compat import text_type

from time import (

time,

altzone

)

import os

from io import BytesIO

import logging

log = logging.getLogger('git.objects.commit')

__all__ = ('Commit', )

class Commit(base.Object, Iterable, Diffable, Traversable, 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 = "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, binsha, tree=None, author=None, authored_date=None, author_tz_offset=None,

committer=None, committed_date=None, committer_tz_offset=None,

message=None, parents=None, encoding=None, gpgsig=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

Tree object

:param author: Actor

is the author string ( will be implicitly converted into an 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 authored_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)

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

self.gpgsig = gpgsig

@classmethod

def _get_intermediate_items(cls, commit):

return commit.parents

def _set_cache_(self, attr):

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 summary(self):

""":return: First line of the commit message"""

return self.message.split('\n', 1)[0]

def count(self, paths='', **kwargs):

"""Count the number of commits reachable from this commit

:param paths:

is an optinal 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 ouput 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())

else:

return len(self.repo.git.rev_list(self.hexsha, **kwargs).splitlines())

@property

def name_rev(self):

"""

: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, rev, paths='', **kwargs):

"""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 optinal 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 = ['--']

if paths:

args.extend((paths, ))

# END if paths

proc = repo.git.rev_list(rev, args, as_process=True, **kwargs)

return cls._iter_from_process_or_stream(repo, proc)

def iter_parents(self, paths='', **kwargs):

"""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):

"""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, 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)

return Stats._list_from_string(self.repo, text)

@classmethod

def _iter_from_process_or_stream(cls, repo, proc_or_stream):

"""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"""

stream = proc_or_stream

if not hasattr(stream, 'readline'):

stream = proc_or_stream.stdout

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, rest = line.split(None, 1)

# END handle extra info

assert len(hexsha) == 40, "Invalid line: %s" % hexsha

yield Commit(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'):

finalize_process(proc_or_stream)

@classmethod

def create_from_tree(cls, repo, tree, message, parent_commits=None, head=False, author=None, committer=None):

"""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.

: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 = list()

# END handle parent commits

else:

for p in parent_commits:

if not isinstance(p, cls):

raise ValueError("Parent commit '%r' must be of type %s" % (p, 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

# COMMITER 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())

offset = altzone

author_date_str = env.get(cls.env_author_date, '')

if 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 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 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)

stream = BytesIO()

new_commit._serialize(stream)

streamlen = stream.tell()

stream.seek(0)

istream = repo.odb.store(IStream(cls.type, streamlen, stream))

new_commit.binsha = istream.binsha

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):

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'))

if self.gpgsig:

write(b"gpgsig")

for sigline in self.gpgsig.rstrip("\n").split("\n"):

write((" " + sigline + "\n").encode('ascii'))

write(b"\n")

# write plain bytes, be sure its encoded according to our encoding

if isinstance(self.message, text_type):

write(self.message.encode(self.encoding))

else:

write(self.message)

# END handle encoding

return self

def _deserialize(self, stream):

""":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 = list()

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

# read headers

enc = next_line

buf = enc.strip()

while buf:

if buf[0:10] == b"encoding ":

self.encoding = buf[buf.find(' ') + 1:].decode('ascii')

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('ascii')

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))

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))

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)

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