Initial set of improvementes merged into master, including a class hierarchy redesign and performance improvements

Merge commit 'origin/improvements'

* commit 'origin/improvements': (38 commits)
  test_performance: module containing benchmarks to get an idea of the achieved throughput
  Removed plenty of mocked tree tests as they cannot work anymore with persistent commands that require stdin AND binary data - not even an adapter would help here. These tests will have to be replaced.
  tree: now reads tress directly by parsing the binary data, allowing it to safe possibly hundreds of command calls
  Refs are now truly dynamic - this costs a little bit of (persistent command) work, but assures refs behave as expected
  persistent command signature changed to also return the hexsha from a possible input ref - the objects pointed to by refs are now baked on demand - perhaps it should change to always be re-retrieved using a property as it is relatively fast - this way refs can always be cached
  test_blob: removed many redundant tests that would fail now as the mock cannot handle the complexity of the command backend
  Implemented git command facility to keep persistent commands for fast object information retrieval
  test: Added time-consuming test which could also be a benchmark in fact - currently it cause hundreds of command invocations which is slow
  cmd: added option to return the process directly, allowing to read the output directly from the output stream
  added Iterable interface to Ref type
  renamed find_all to list_all, changed commit to use iterable interface in preparation for command changes
  Added base for all iteratable objects
  unified name of utils module, recently it was named util and utils in different packages
  tree: renamed content_from_string to _from_string to make it private. Removed tests that were testing that method
  tree: now behaves like a list with string indexing functionality - using a dict as cache is a problem as the tree is ordered, added blobs, trees and traverse method
  test_base: Improved basic object creation as well as set hash tests
  repo.active_branch now returns a Head object, not a string
  IndexObjects are now checking their slots to raise a proper error message in case someone tries to access an unset path or mode - this information cannot be retrieved afterwards as IndexObject information is kept in the object that pointed at them. To find this information, one would have to search all objects which is not feasible
  refs now take repo as first argument and derive from LazyMixin to allow them to dynamically retrieve their objects
  renamed from_string and list_from_string to _from_string and _list_from_string to indicate their new status as private method, adjusted all callers respectively
  ...

1 files changed, 546 insertions, 464 deletions

diff --git a/lib/git/repo.py b/lib/git/repo.py
index 1c4b4095..c74c7e8d 100644
--- a/lib/git/repo.py
+++ b/lib/git/repo.py
@@ -8,506 +8,588 @@ import os
 import re
 import gzip
 import StringIO
+import time
+
 from errors import InvalidGitRepositoryError, NoSuchPathError
 from utils import touch, is_git_dir
 from cmd import Git
-from head import Head
-from blob import Blob
-from tag import Tag
-from commit import Commit
-from tree import Tree
+from actor import Actor
+from refs import *
+from objects import *
+
 
 class Repo(object):
-    """
-    Represents a git repository and allows you to query references, 
-    gather commit information, generate diffs, create and clone repositories query
-    the log.
-    """
-    DAEMON_EXPORT_FILE = 'git-daemon-export-ok'
-
-    def __init__(self, path=None):
-        """
-        Create a new Repo instance
-
-        ``path``
-            is the path to either the root git directory or the bare git repo
-
-        Examples::
-
-            repo = Repo("/Users/mtrier/Development/git-python")
-            repo = Repo("/Users/mtrier/Development/git-python.git")
-
-        Raises
-            InvalidGitRepositoryError or NoSuchPathError
-
-        Returns
-            ``git.Repo``
-        """
-
-        epath = os.path.abspath(os.path.expanduser(path or os.getcwd()))
-
-        if not os.path.exists(epath):
-            raise NoSuchPathError(epath)
-
-        self.path = None
-        curpath = epath
-        while curpath:
-            if is_git_dir(curpath):
-                self.bare = True
-                self.path = curpath
-                self.wd = curpath
-                break
-            gitpath = os.path.join(curpath, '.git')
-            if is_git_dir(gitpath):
-                self.bare = False
-                self.path = gitpath
-                self.wd = curpath
-                break
-            curpath, dummy = os.path.split(curpath)
-            if not dummy:
-                break
-
-        if self.path is None:
-           raise InvalidGitRepositoryError(epath)
-
-        self.git = Git(self.wd)
-
-    # Description property
-    def _get_description(self):
-        filename = os.path.join(self.path, 'description')
-        return file(filename).read().rstrip()
-
-    def _set_description(self, descr):
-        filename = os.path.join(self.path, 'description')
-        file(filename, 'w').write(descr+'\n')
-
-    description = property(_get_description, _set_description,
-                           doc="the project's description")
-    del _get_description
-    del _set_description
-
-    @property
-    def heads(self):
-        """
-        A list of ``Head`` objects representing the branch heads in
-        this repo
-
-        Returns
-            ``git.Head[]``
-        """
-        return Head.find_all(self)
-
-    # alias heads
-    branches = heads
-
-    @property
-    def tags(self):
-        """
-        A list of ``Tag`` objects that are available in this repo
-
-        Returns
-            ``git.Tag[]``
-        """
-        return Tag.find_all(self)
-
-    def commits(self, start='master', path='', max_count=10, skip=0):
-        """
-        A list of Commit objects representing the history of a given ref/commit
-
-        ``start``
-            is the branch/commit name (default 'master')
-
-         ``path``
-            is an optional path to limit the returned commits to
-            Commits that do not contain that path will not be returned.
-
-         ``max_count``
-            is the maximum number of commits to return (default 10)
+	"""
+	Represents a git repository and allows you to query references, 
+	gather commit information, generate diffs, create and clone repositories query
+	the log.
+	"""
+	DAEMON_EXPORT_FILE = 'git-daemon-export-ok'
+	
+	# precompiled regex
+	re_whitespace = re.compile(r'\s+')
+	re_hexsha_only = re.compile('^[0-9A-Fa-f]{40}$')
+	re_author_committer_start = re.compile(r'^(author|committer)')
+	re_tab_full_line = re.compile(r'^\t(.*)$')
+
+	def __init__(self, path=None):
+		"""
+		Create a new Repo instance
+
+		``path``
+			is the path to either the root git directory or the bare git repo
+
+		Examples::
+
+			repo = Repo("/Users/mtrier/Development/git-python")
+			repo = Repo("/Users/mtrier/Development/git-python.git")
+
+		Raises
+			InvalidGitRepositoryError or NoSuchPathError
+
+		Returns
+			``git.Repo``
+		"""
+
+		epath = os.path.abspath(os.path.expanduser(path or os.getcwd()))
+
+		if not os.path.exists(epath):
+			raise NoSuchPathError(epath)
+
+		self.path = None
+		curpath = epath
+		while curpath:
+			if is_git_dir(curpath):
+				self.bare = True
+				self.path = curpath
+				self.wd = curpath
+				break
+			gitpath = os.path.join(curpath, '.git')
+			if is_git_dir(gitpath):
+				self.bare = False
+				self.path = gitpath
+				self.wd = curpath
+				break
+			curpath, dummy = os.path.split(curpath)
+			if not dummy:
+				break
+
+		if self.path is None:
+		   raise InvalidGitRepositoryError(epath)
+
+		self.git = Git(self.wd)
+
+	# Description property
+	def _get_description(self):
+		filename = os.path.join(self.path, 'description')
+		return file(filename).read().rstrip()
+
+	def _set_description(self, descr):
+		filename = os.path.join(self.path, 'description')
+		file(filename, 'w').write(descr+'\n')
+
+	description = property(_get_description, _set_description,
+						   doc="the project's description")
+	del _get_description
+	del _set_description
+
+	@property
+	def heads(self):
+		"""
+		A list of ``Head`` objects representing the branch heads in
+		this repo
+
+		Returns
+			``git.Head[]``
+		"""
+		return Head.list_items(self)
+
+	# alias heads
+	branches = heads
+
+	@property
+	def tags(self):
+		"""
+		A list of ``Tag`` objects that are available in this repo
+
+		Returns
+			``git.Tag[]``
+		"""
+		return Tag.list_items(self)
+		
+	def blame(self, commit, file):
+		"""
+		The blame information for the given file at the given commit
+
+		Returns
+			list: [git.Commit, list: [<line>]]
+			A list of tuples associating a Commit object with a list of lines that 
+			changed within the given commit. The Commit objects will be given in order
+			of appearance.
+		"""
+		data = self.git.blame(commit, '--', file, p=True)
+		commits = {}
+		blames = []
+		info = None
+
+		for line in data.splitlines(False):
+			parts = self.re_whitespace.split(line, 1)
+			firstpart = parts[0]
+			if self.re_hexsha_only.search(firstpart):
+				# handles 
+				# 634396b2f541a9f2d58b00be1a07f0c358b999b3 1 1 7		- indicates blame-data start
+				# 634396b2f541a9f2d58b00be1a07f0c358b999b3 2 2
+				digits = parts[-1].split(" ")
+				if len(digits) == 3:
+					info = {'id': firstpart}
+					blames.append([None, []])
+				# END blame data initialization
+			else:
+				m = self.re_author_committer_start.search(firstpart)
+				if m:
+					# handles: 
+					# author Tom Preston-Werner
+					# author-mail <tom@mojombo.com>
+					# author-time 1192271832
+					# author-tz -0700
+					# committer Tom Preston-Werner
+					# committer-mail <tom@mojombo.com>
+					# committer-time 1192271832
+					# committer-tz -0700  - IGNORED BY US
+					role = m.group(0)
+					if firstpart.endswith('-mail'):
+						info["%s_email" % role] = parts[-1]
+					elif firstpart.endswith('-time'):
+						info["%s_date" % role] = time.gmtime(int(parts[-1]))
+					elif role == firstpart:
+						info[role] = parts[-1]
+					# END distinguish mail,time,name
+				else:
+					# handle
+					# filename lib/grit.rb
+					# summary add Blob
+					# <and rest>
+					if firstpart.startswith('filename'):
+						info['filename'] = parts[-1]
+					elif firstpart.startswith('summary'):
+						info['summary'] = parts[-1]
+					elif firstpart == '':
+						if info:
+							sha = info['id']
+							c = commits.get(sha)
+							if c is None:
+								c = Commit(  self, id=sha,
+											 author=Actor._from_string(info['author'] + ' ' + info['author_email']),
+											 authored_date=info['author_date'],
+											 committer=Actor._from_string(info['committer'] + ' ' + info['committer_email']),
+											 committed_date=info['committer_date'],
+											 message=info['summary'])
+								commits[sha] = c
+							# END if commit objects needs initial creation
+							m = self.re_tab_full_line.search(line)
+							text,  = m.groups()
+							blames[-1][0] = c
+							blames[-1][1].append( text )
+							info = None
+						# END if we collected commit info
+					# END distinguish filename,summary,rest
+				# END distinguish author|committer vs filename,summary,rest
+			# END distinguish hexsha vs other information
+		return blames
+
+	def commits(self, start='master', path='', max_count=None, skip=0):
+		"""
+		A list of Commit objects representing the history of a given ref/commit
+
+		``start``
+			is the branch/commit name (default 'master')
+
+		 ``path``
+			is an optional path to limit the returned commits to
+			Commits that do not contain that path will not be returned.
+
+		 ``max_count``
+			is the maximum number of commits to return (default None)
+
+		  ``skip``
+			is the number of commits to skip (default 0) which will effectively 
+			move your commit-window by the given number.
+
+		Returns
+			``git.Commit[]``
+		"""
+		options = {'max_count': max_count,
+				   'skip': skip}
+				   
+		if max_count is None:
+			options.pop('max_count')		   
+				  
+		return Commit.list_items(self, start, path, **options)
+
+	def commits_between(self, frm, to):
+		"""
+		The Commits objects that are reachable via ``to`` but not via ``frm``
+		Commits are returned in chronological order.
+
+		``from``
+			is the branch/commit name of the younger item
+
+		``to``
+			is the branch/commit name of the older item
+
+		Returns
+			``git.Commit[]``
+		"""
+		return reversed(Commit.list_items(self, "%s..%s" % (frm, to)))
+
+	def commits_since(self, start='master', path='', since='1970-01-01'):
+		"""
+		The Commits objects that are newer than the specified date.
+		Commits are returned in chronological order.
+
+		``start``
+			is the branch/commit name (default 'master')
+
+		``path``
+			is an optinal path to limit the returned commits to.
+			
+
+		``since``
+			is a string represeting a date/time
 
-          ``skip``
-            is the number of commits to skip (default 0) which will effectively 
-            move your commit-window by the given number.
+		Returns
+			``git.Commit[]``
+		"""
+		options = {'since': since}
 
-        Returns
-            ``git.Commit[]``
-        """
-        options = {'max_count': max_count,
-                   'skip': skip}
+		return Commit.list_items(self, start, path, **options)
 
-        return Commit.find_all(self, start, path, **options)
+	def commit_count(self, start='master', path=''):
+		"""
+		The number of commits reachable by the given branch/commit
 
-    def commits_between(self, frm, to):
-        """
-        The Commits objects that are reachable via ``to`` but not via ``frm``
-        Commits are returned in chronological order.
+		``start``
+			is the branch/commit name (default 'master')
 
-        ``from``
-            is the branch/commit name of the younger item
+		``path``
+			is an optional path
+			Commits that do not contain the path will not contribute to the count.
 
-        ``to``
-            is the branch/commit name of the older item
-
-        Returns
-            ``git.Commit[]``
-        """
-        return reversed(Commit.find_all(self, "%s..%s" % (frm, to)))
-
-    def commits_since(self, start='master', path='', since='1970-01-01'):
-        """
-        The Commits objects that are newer than the specified date.
-        Commits are returned in chronological order.
+		Returns
+			``int``
+		"""
+		return Commit.count(self, start, path)
 
-        ``start``
-            is the branch/commit name (default 'master')
+	def commit(self, id=None, path = ''):
+		"""
+		The Commit object for the specified id
 
-        ``path``
-            is an optinal path to limit the returned commits to.
-            
+		``id``
+			is the SHA1 identifier of the commit or a ref or a ref name
+			if None, it defaults to the active branch
+		
 
-        ``since``
-            is a string represeting a date/time
+		``path``
+			is an optional path, if set the returned commit must contain the path.
 
-        Returns
-            ``git.Commit[]``
-        """
-        options = {'since': since}
+		Returns
+			``git.Commit``
+		"""
+		if id is None:
+			id = self.active_branch
+		options = {'max_count': 1}
 
-        return Commit.find_all(self, start, path, **options)
-
-    def commit_count(self, start='master', path=''):
-        """
-        The number of commits reachable by the given branch/commit
-
-        ``start``
-            is the branch/commit name (default 'master')
+		commits = Commit.list_items(self, id, path, **options)
 
-        ``path``
-            is an optional path
-            Commits that do not contain the path will not contribute to the count.
-
-        Returns
-            ``int``
-        """
-        return Commit.count(self, start, path)
-
-    def commit(self, id, path = ''):
-        """
-        The Commit object for the specified id
-
-        ``id``
-            is the SHA1 identifier of the commit
-
-        ``path``
-            is an optional path, if set the returned commit must contain the path.
-
-        Returns
-            ``git.Commit``
-        """
-        options = {'max_count': 1}
-
-        commits = Commit.find_all(self, id, path, **options)
-
-        if not commits:
-            raise ValueError, "Invalid identifier %s, or given path '%s' too restrictive" % ( id, path )
-        return commits[0]
-
-    def commit_deltas_from(self, other_repo, ref='master', other_ref='master'):
-        """
-        Returns a list of commits that is in ``other_repo`` but not in self
-
-        Returns 
-            git.Commit[]
-        """
-        repo_refs = self.git.rev_list(ref, '--').strip().splitlines()
-        other_repo_refs = other_repo.git.rev_list(other_ref, '--').strip().splitlines()
+		if not commits:
+			raise ValueError, "Invalid identifier %s, or given path '%s' too restrictive" % ( id, path )
+		return commits[0]
 
-        diff_refs = list(set(other_repo_refs) - set(repo_refs))
-        return map(lambda ref: Commit.find_all(other_repo, ref, max_count=1)[0], diff_refs)
+	def commit_deltas_from(self, other_repo, ref='master', other_ref='master'):
+		"""
+		Returns a list of commits that is in ``other_repo`` but not in self
 
-    def tree(self, treeish='master'):
-        """
-        The Tree object for the given treeish reference
+		Returns 
+			git.Commit[]
+		"""
+		repo_refs = self.git.rev_list(ref, '--').strip().splitlines()
+		other_repo_refs = other_repo.git.rev_list(other_ref, '--').strip().splitlines()
 
-        ``treeish``
-            is the reference (default 'master')
+		diff_refs = list(set(other_repo_refs) - set(repo_refs))
+		return map(lambda ref: Commit.list_items(other_repo, ref, max_count=1)[0], diff_refs)
 
-        Examples::
+	def tree(self, treeish=None):
+		"""
+		The Tree object for the given treeish reference
 
-          repo.tree('master')
+		``treeish``
+			is a Ref instance defaulting to the active_branch if None.
 
+		Examples::
+
+		  repo.tree(repo.heads[0])
+
+		Returns
+			``git.Tree``
+			
+		NOTE
+			A ref is requried here to assure you point to a commit or tag. Otherwise
+			it is not garantueed that you point to the root-level tree.
+			
+			If you need a non-root level tree, find it by iterating the root tree.
+		"""
+		if treeish is None:
+			treeish = self.active_branch
+		if not isinstance(treeish, Ref):
+			raise ValueError( "Treeish reference required, got %r" % treeish )
+		
+		
+		# As we are directly reading object information, we must make sure
+		# we truly point to a tree object. We resolve the ref to a sha in all cases
+		# to assure the returned tree can be compared properly. Except for
+		# heads, ids should always be hexshas
+		hexsha, typename, size = self.git.get_object_header( treeish )
+		if typename != "tree":
+			hexsha, typename, size = self.git.get_object_header( str(treeish)+'^{tree}' )
+		# END tree handling
+		treeish = hexsha
+		
+		# the root has an empty relative path and the default mode
+		return Tree(self, treeish, 0, '')
+
+
+	def diff(self, a, b, *paths):
+		"""
+		The diff from commit ``a`` to commit ``b``, optionally restricted to the given file(s)
+
+		``a``
+			is the base commit
+		``b``
+			is the other commit
+
+		``paths``
+			is an optional list of file paths on which to restrict the diff
+			
+		Returns
+			``str``
+		"""
+		return self.git.diff(a, b, '--', *paths)
 
-        Returns
-            ``git.Tree``
-        """
-        return Tree(self, id=treeish)
+	def commit_diff(self, commit):
+		"""
+		The commit diff for the given commit
+		  ``commit`` is the commit name/id
 
-    def blob(self, id):
-        """
-        The Blob object for the given id
-
-        ``id``
-            is the SHA1 id of the blob
-
-        Returns
-            ``git.Blob``
-        """
-        return Blob(self, id=id)
-
-    def log(self, commit='master', path=None, **kwargs):
-        """
-        The Commit for a treeish, and all commits leading to it.
-        
-        ``kwargs``
-        	keyword arguments specifying flags to be used in git-log command,
-        	i.e.: max_count=1 to limit the amount of commits returned
+		Returns
+			``git.Diff[]``
+		"""
+		return Commit.diff(self, commit)
 
-        Returns
-            ``git.Commit[]``
-        """
-        options = {'pretty': 'raw'}
-        options.update(kwargs)
-        arg = [commit, '--']
-        if path:
-            arg.append(path)
-        commits = self.git.log(*arg, **options)
-        return Commit.list_from_string(self, commits)
+	@classmethod
+	def init_bare(self, path, mkdir=True, **kwargs):
+		"""
+		Initialize a bare git repository at the given path
 
-    def diff(self, a, b, *paths):
-        """
-        The diff from commit ``a`` to commit ``b``, optionally restricted to the given file(s)
-
-        ``a``
-            is the base commit
-        ``b``
-            is the other commit
+		``path``
+			is the full path to the repo (traditionally ends with /<name>.git)
 
-        ``paths``
-            is an optional list of file paths on which to restrict the diff
-            
-        Returns
-        	``str``
-        """
-        return self.git.diff(a, b, '--', *paths)
+		``mkdir``
+			if specified will create the repository directory if it doesn't
+			already exists. Creates the directory with a mode=0755.
 
-    def commit_diff(self, commit):
-        """
-        The commit diff for the given commit
-          ``commit`` is the commit name/id
+		``kwargs``
+			keyword arguments serving as additional options to the git init command
 
-        Returns
-            ``git.Diff[]``
-        """
-        return Commit.diff(self, commit)
+		Examples::
 
-    @classmethod
-    def init_bare(self, path, mkdir=True, **kwargs):
-        """
-        Initialize a bare git repository at the given path
+			git.Repo.init_bare('/var/git/myrepo.git')
 
-        ``path``
-            is the full path to the repo (traditionally ends with /<name>.git)
-
-        ``mkdir``
-            if specified will create the repository directory if it doesn't
-            already exists. Creates the directory with a mode=0755.
-
-        ``kwargs``
-            keyword arguments serving as additional options to the git init command
-
-        Examples::
-
-            git.Repo.init_bare('/var/git/myrepo.git')
-
-        Returns
-            ``git.Repo`` (the newly created repo)
-        """
-
-        if mkdir and not os.path.exists(path):
-            os.makedirs(path, 0755)
-
-        git = Git(path)
-        output = git.init('--bare', **kwargs)
-        return Repo(path)
-    create = init_bare
-
-    def fork_bare(self, path, **kwargs):
-        """
-        Fork a bare git repository from this repo
-
-        ``path``
-            is the full path of the new repo (traditionally ends with /<name>.git)
-
-        ``kwargs``
-            keyword arguments to be given to the git clone command
-
-        Returns
-            ``git.Repo`` (the newly forked repo)
-        """
-        options = {'bare': True}
-        options.update(kwargs)
-        self.git.clone(self.path, path, **options)
-        return Repo(path)
-
-    def archive_tar(self, treeish='master', prefix=None):
-        """
-        Archive the given treeish
-
-        ``treeish``
-            is the treeish name/id (default 'master')
-
-        ``prefix``
-            is the optional prefix to prepend to each filename in the archive
-
-        Examples::
-
-            >>> repo.archive_tar
-            <String containing tar archive>
-
-            >>> repo.archive_tar('a87ff14')
-            <String containing tar archive for commit a87ff14>
-
-            >>> repo.archive_tar('master', 'myproject/')
-            <String containing tar bytes archive, whose files are prefixed with 'myproject/'>
-
-        Returns
-            str (containing bytes of tar archive)
-        """
-        options = {}
-        if prefix:
-            options['prefix'] = prefix
-        return self.git.archive(treeish, **options)
-
-    def archive_tar_gz(self, treeish='master', prefix=None):
-        """
-        Archive and gzip the given treeish
-
-        ``treeish``
-            is the treeish name/id (default 'master')
-
-        ``prefix``
-            is the optional prefix to prepend to each filename in the archive
-
-        Examples::
-
-            >>> repo.archive_tar_gz
-            <String containing tar.gz archive>
-
-            >>> repo.archive_tar_gz('a87ff14')
-            <String containing tar.gz archive for commit a87ff14>
-
-            >>> repo.archive_tar_gz('master', 'myproject/')
-            <String containing tar.gz archive and prefixed with 'myproject/'>
-
-        Returns
-            str (containing the bytes of tar.gz archive)
-        """
-        kwargs = {}
-        if prefix:
-            kwargs['prefix'] = prefix
-        resultstr =  self.git.archive(treeish, **kwargs)
-        sio = StringIO.StringIO()
-        gf = gzip.GzipFile(fileobj=sio, mode ='wb')
-        gf.write(resultstr)
-        gf.close()
-        return sio.getvalue()
-
-    def _get_daemon_export(self):
-        filename = os.path.join(self.path, self.DAEMON_EXPORT_FILE)
-        return os.path.exists(filename)
-
-    def _set_daemon_export(self, value):
-        filename = os.path.join(self.path, self.DAEMON_EXPORT_FILE)
-        fileexists = os.path.exists(filename)
-        if value and not fileexists:
-            touch(filename)
-        elif not value and fileexists:
-            os.unlink(filename)
-
-    daemon_export = property(_get_daemon_export, _set_daemon_export,
-                             doc="If True, git-daemon may export this repository")
-    del _get_daemon_export
-    del _set_daemon_export
-
-    def _get_alternates(self):
-        """
-        The list of alternates for this repo from which objects can be retrieved
-
-        Returns
-            list of strings being pathnames of alternates
-        """
-        alternates_path = os.path.join(self.path, 'objects', 'info', 'alternates')
-
-        if os.path.exists(alternates_path):
-            try:
-                f = open(alternates_path)
-                alts = f.read()
-            finally:
-                f.close()
-            return alts.strip().splitlines()
-        else:
-            return []
-
-    def _set_alternates(self, alts):
-        """
-        Sets the alternates
-
-        ``alts``
-            is the array of string paths representing the alternates at which 
-            git should look for objects, i.e. /home/user/repo/.git/objects
+		Returns
+			``git.Repo`` (the newly created repo)
+		"""
+
+		if mkdir and not os.path.exists(path):
+			os.makedirs(path, 0755)
+
+		git = Git(path)
+		output = git.init('--bare', **kwargs)
+		return Repo(path)
+	create = init_bare
+
+	def fork_bare(self, path, **kwargs):
+		"""
+		Fork a bare git repository from this repo
+
+		``path``
+			is the full path of the new repo (traditionally ends with /<name>.git)
+
+		``kwargs``
+			keyword arguments to be given to the git clone command
+
+		Returns
+			``git.Repo`` (the newly forked repo)
+		"""
+		options = {'bare': True}
+		options.update(kwargs)
+		self.git.clone(self.path, path, **options)
+		return Repo(path)
+
+	def archive_tar(self, treeish='master', prefix=None):
+		"""
+		Archive the given treeish
+
+		``treeish``
+			is the treeish name/id (default 'master')
+
+		``prefix``
+			is the optional prefix to prepend to each filename in the archive
+
+		Examples::
+
+			>>> repo.archive_tar
+			<String containing tar archive>
+
+			>>> repo.archive_tar('a87ff14')
+			<String containing tar archive for commit a87ff14>
+
+			>>> repo.archive_tar('master', 'myproject/')
+			<String containing tar bytes archive, whose files are prefixed with 'myproject/'>
+
+		Returns
+			str (containing bytes of tar archive)
+		"""
+		options = {}
+		if prefix:
+			options['prefix'] = prefix
+		return self.git.archive(treeish, **options)
+
+	def archive_tar_gz(self, treeish='master', prefix=None):
+		"""
+		Archive and gzip the given treeish
+
+		``treeish``
+			is the treeish name/id (default 'master')
+
+		``prefix``
+			is the optional prefix to prepend to each filename in the archive
+
+		Examples::
+
+			>>> repo.archive_tar_gz
+			<String containing tar.gz archive>
+
+			>>> repo.archive_tar_gz('a87ff14')
+			<String containing tar.gz archive for commit a87ff14>
+
+			>>> repo.archive_tar_gz('master', 'myproject/')
+			<String containing tar.gz archive and prefixed with 'myproject/'>
+
+		Returns
+			str (containing the bytes of tar.gz archive)
+		"""
+		kwargs = {}
+		if prefix:
+			kwargs['prefix'] = prefix
+		resultstr =  self.git.archive(treeish, **kwargs)
+		sio = StringIO.StringIO()
+		gf = gzip.GzipFile(fileobj=sio, mode ='wb')
+		gf.write(resultstr)
+		gf.close()
+		return sio.getvalue()
+
+	def _get_daemon_export(self):
+		filename = os.path.join(self.path, self.DAEMON_EXPORT_FILE)
+		return os.path.exists(filename)
+
+	def _set_daemon_export(self, value):
+		filename = os.path.join(self.path, self.DAEMON_EXPORT_FILE)
+		fileexists = os.path.exists(filename)
+		if value and not fileexists:
+			touch(filename)
+		elif not value and fileexists:
+			os.unlink(filename)
+
+	daemon_export = property(_get_daemon_export, _set_daemon_export,
+							 doc="If True, git-daemon may export this repository")
+	del _get_daemon_export
+	del _set_daemon_export
+
+	def _get_alternates(self):
+		"""
+		The list of alternates for this repo from which objects can be retrieved
+
+		Returns
+			list of strings being pathnames of alternates
+		"""
+		alternates_path = os.path.join(self.path, 'objects', 'info', 'alternates')
+
+		if os.path.exists(alternates_path):
+			try:
+				f = open(alternates_path)
+				alts = f.read()
+			finally:
+				f.close()
+			return alts.strip().splitlines()
+		else:
+			return []
+
+	def _set_alternates(self, alts):
+		"""
+		Sets the alternates
+
+		``alts``
+			is the array of string paths representing the alternates at which 
+			git should look for objects, i.e. /home/user/repo/.git/objects
 
 		Raises
 			NoSuchPathError
 			
-        Returns
-            None
-        """
-        for alt in alts:
-            if not os.path.exists(alt):
-                raise NoSuchPathError("Could not set alternates. Alternate path %s must exist" % alt)
-
-        if not alts:
-            os.remove(os.path.join(self.path, 'objects', 'info', 'alternates'))
-        else:
-            try:
-                f = open(os.path.join(self.path, 'objects', 'info', 'alternates'), 'w')
-                f.write("\n".join(alts))
-            finally:
-                f.close()
-
-    alternates = property(_get_alternates, _set_alternates, doc="Retrieve a list of alternates paths or set a list paths to be used as alternates")
-
-    @property
-    def is_dirty(self):
-        """
-        Return the status of the index.
-
-        Returns
-            ``True``, if the index has any uncommitted changes,
-            otherwise ``False``
+		Returns
+			None
+		"""
+		for alt in alts:
+			if not os.path.exists(alt):
+				raise NoSuchPathError("Could not set alternates. Alternate path %s must exist" % alt)
+
+		if not alts:
+			os.remove(os.path.join(self.path, 'objects', 'info', 'alternates'))
+		else:
+			try:
+				f = open(os.path.join(self.path, 'objects', 'info', 'alternates'), 'w')
+				f.write("\n".join(alts))
+			finally:
+				f.close()
+
+	alternates = property(_get_alternates, _set_alternates, doc="Retrieve a list of alternates paths or set a list paths to be used as alternates")
+
+	@property
+	def is_dirty(self):
+		"""
+		Return the status of the index.
+
+		Returns
+			``True``, if the index has any uncommitted changes,
+			otherwise ``False``
 
 		NOTE
 			Working tree changes that have not been staged will not be detected ! 
-        """
-        if self.bare:
-            # Bare repositories with no associated working directory are
-            # always consired to be clean.
-            return False
-
-        return len(self.git.diff('HEAD', '--').strip()) > 0
-
-    @property
-    def active_branch(self):
-        """
-        The name of the currently active branch.
-
-        Returns
-            str (the branch name)
-        """
-        branch = self.git.symbolic_ref('HEAD').strip()
-        if branch.startswith('refs/heads/'):
-            branch = branch[len('refs/heads/'):]
-
-        return branch
-
-    def __repr__(self):
-        return '<git.Repo "%s">' % self.path
+		"""
+		if self.bare:
+			# Bare repositories with no associated working directory are
+			# always consired to be clean.
+			return False
+
+		return len(self.git.diff('HEAD', '--').strip()) > 0
+
+	@property
+	def active_branch(self):
+		"""
+		The name of the currently active branch.
+
+		Returns
+			Head to the active branch
+		"""
+		return Head( self, self.git.symbolic_ref('HEAD').strip() )
+
+	def __repr__(self):
+		return '<git.Repo "%s">' % self.path