Trac 0.12 にgitのplugin入れたらpython2.4で困った

今回、初のgitだと浮かれてリポジトリを作り、まだソース管理しなくてもいいやと思うぐらい
簡単なデモ用のプログラムを作っていたけれど、コメントを書きながらリポジトリの変更点を書くのが面倒だと
思い始めてきたので、Tracでgitリポジトリを使えるようにするpluginを導入しました。

TracでGitを利用する
このサイトを見て、これほど簡単ならと思い、githubでタグを確認して
実行してみると、下記のエラーが。


Downloading http://github.com/hvr/trac-git-plugin/tarball/master
Processing master
Running hvr-trac-git-plugin-2c21931/setup.py -q bdist_egg --dist-dir /tmp/easy_install-M9KBT0/hvr-trac-git-plugin-2c21931/egg-dist-tmp-AqLF1t
  File "build/bdist.linux-i686/egg/tracext/git/git_fs.py", line 569
    yield (self.path, rev, Changeset.EDIT if not is_last else Changeset.ADD)
                                           ^
SyntaxError: invalid syntax
  File "build/bdist.linux-i686/egg/tracext/git/PyGIT.py", line 106
    with self.__lock:
            ^
SyntaxError: invalid syntax
zip_safe flag not set; analyzing archive contents...
TracGit 0.12.0.5dev is already the active version in easy-install.pth
 
Installed /usr/lib/python2.4/site-packages/TracGit-0.12.0.5dev-py2.4.egg
Processing dependencies for TracGit==0.12.0.5dev


http://trac-hacks.org/ticket/8102
調べると、上記のページにPython2.6用に作ってあるから、2.4のを使えって書いてありました。

http://trac-hacks.org/wiki/GitPlugin

or alternatively the Python 2.4 backport:

easy_install http://github.com/hvr/trac-git-plugin/tarball/trac-0.11-py24

じゃあこれを使おうと思って下記のコマンド実行。

# easy_install http://github.com/hvr/trac-git-plugin/tarball/trac-0.11-py24
----
Downloading http://github.com/hvr/trac-git-plugin/tarball/trac-0.11-py24
Processing trac-0.11-py24
Running hvr-trac-git-plugin-582becf/setup.py -q bdist_egg --dist-dir /tmp/easy_install-Uh7Xxu/hvr-trac-git-plugin-582becf/egg-dist-tmp-l5S1Wp
warning: install_data: setup script did not provide a directory for 'COPYING' -- installing right in 'build/bdist.linux-i686/egg'
warning: install_data: setup script did not provide a directory for 'README' -- installing right in 'build/bdist.linux-i686/egg'
zip_safe flag not set; analyzing archive contents...
Removing TracGit 0.12.0.5dev from easy-install.pth file
Adding TracGit 0.11.0.2 to easy-install.pth file
 
Installed /usr/lib/python2.4/site-packages/TracGit-0.11.0.2-py2.4.egg
Processing dependencies for TracGit==0.11.0.2


git pluginを有効に。

Tracの管理からプラグインを有効にしてみます。

エラー出ちゃった

エラーが出たので何とか頑張ってみますかね。→0.12の最新を何とかする方向でやりました。
Python2.6にバージョンアップしたほうが良いかもですが。。。。

8/8追記
https://github.com/arjoe/trac-git-plugin/commit/587393a374f4630731523b2ecfa7c687eccc531e

ここに出ている2.4へ戻すコードを(tracext/git/future27.py )以外すべて適用するのと、
https://github.com/hvr/trac-git-plugin/blob/trac-0.11-py24/tracext/git/PyGIT.py
ここを参考に下記の関数定義したらできた。。。
5時間かかってるつらーい。。

    28  try:
    29      all
    30  except NameError:
    31      def all(iterable):
    32          for i in iterable:
    33              if not i:
    34                  return False
    35          return True
    36
    37  try:
    38      any
    39  except NameError:
    40      def any(iterable):
    41          for i in iterable:
    42              if i:
    43                  return True
    44          return False



9/3 追記
PyGIT.pyの全文を載せておこうと思います。こんなのコピペして使う人いるか分かりませんがー

# -*- coding: iso-8859-1 -*-
#
# Copyright (C) 2006-2010 Herbert Valerio Riedel <hvr@gnu.org>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
 
# from __future__ import with_statement
 
import os, re, sys, time, weakref
from collections import deque
#from functools import partial
from threading import Lock
from subprocess import Popen, PIPE
from operator import itemgetter
import cStringIO
import codecs
 
__all__ = ["git_version", "GitError", "GitErrorSha", "Storage", "StorageFactory"]
 
try:
    all
except NameError:
    def all(iterable):
        for i in iterable:
            if not i:
                return False
        return True
 
try:
    any
except NameError:
    def any(iterable):
        for i in iterable:
            if i:
                return True
        return False
 
class GitError(Exception):
    pass
 
class GitErrorSha(GitError):
    pass
 
class GitCore(object):
    """
    Low-level wrapper around git executable
    """
 
    def __init__(self, git_dir=None, git_bin="git"):
        self.__git_bin = git_bin
        self.__git_dir = git_dir
 
    def __build_git_cmd(self, gitcmd, *args):
        "construct command tuple for git call suitable for Popen()"
 
        cmd = [self.__git_bin]
        if self.__git_dir:
            cmd.append('--git-dir=%s' % self.__git_dir)
        cmd.append(gitcmd)
        cmd.extend(args)
 
        return cmd
 
    def __execute(self, git_cmd, *cmd_args):
        "execute git command and return file-like object of stdout"
 
        #print >>sys.stderr, "DEBUG:", git_cmd, cmd_args
 
        if sys.platform == "win32":
            p = Popen(self.__build_git_cmd(git_cmd, *cmd_args),
                      stdin=None, stdout=PIPE, stderr=PIPE)
        else:
            p = Popen(self.__build_git_cmd(git_cmd, *cmd_args),
                      stdin=None, stdout=PIPE, stderr=PIPE, close_fds=True)
 
        stdout_data, stderr_data = p.communicate()
        #TODO, do something with p.returncode, e.g. raise exception
 
        return stdout_data
 
    def __getattr__(self, name):
        #return partial(self.__execute, name.replace('_','-'))
        return lambda *args: self.__execute(name.replace('_','-'), *args)
 
    __is_sha_pat = re.compile(r'[0-9A-Fa-f]*$')
 
    @classmethod
    def is_sha(cls, sha):
        """
        returns whether sha is a potential sha id
        (i.e. proper hexstring between 4 and 40 characters)
        """
 
        # quick test before starting up regexp matcher
        if not (4 <= len(sha) <= 40):
            return False
 
        return bool(cls.__is_sha_pat.match(sha))
 
class SizedDict(dict):
    """
    Size-bounded dictionary with FIFO replacement strategy
    """
 
    def __init__(self, max_size=0):
        dict.__init__(self)
        self.__max_size = max_size
        self.__key_fifo = deque()
        self.__lock = Lock()
 
    def __setitem__(self, name, value):
        #with self.__lock:
        #    assert len(self) == len(self.__key_fifo) # invariant
        self.__lock.acquire()
        try:
            assert len(self) == len(self.__key_fifo) # invariant
 
            if not self.__contains__(name):
                self.__key_fifo.append(name)
 
            rc = dict.__setitem__(self, name, value)
 
            while len(self.__key_fifo) > self.__max_size:
                self.__delitem__(self.__key_fifo.popleft())
 
            assert len(self) == len(self.__key_fifo) # invariant
 
            return rc
        finally:
            self.__lock.release()
 
    def setdefault(self, *_):
        raise NotImplemented("SizedDict has no setdefault() method")
 
class StorageFactory(object):
    __dict = weakref.WeakValueDictionary()
    __dict_nonweak = dict()
    __dict_lock = Lock()
 
    def __init__(self, repo, log, weak=True, git_bin='git', git_fs_encoding=None):
        self.logger = log
 
        # with StorageFactory.__dict_lock:
        StorageFactory.__dict_lock.acquire()
        try:
            try:
                i = StorageFactory.__dict[repo]
            except KeyError:
                i = Storage(repo, log, git_bin, git_fs_encoding)
                StorageFactory.__dict[repo] = i
 
                # create or remove additional reference depending on 'weak' argument
                if weak:
                    try:
                        del StorageFactory.__dict_nonweak[repo]
                    except KeyError:
                        pass
                else:
                    StorageFactory.__dict_nonweak[repo] = i
        finally:
            StorageFactory.__dict_lock.release()
 
        self.__inst = i
        self.__repo = repo
 
    def getInstance(self):
        is_weak = self.__repo not in StorageFactory.__dict_nonweak
        self.logger.debug("requested %sPyGIT.Storage instance %d for '%s'"
                          % (("","weak ")[is_weak], id(self.__inst), self.__repo))
        return self.__inst
 
# generated with Python 2.6's collections.namedtuple -- we can't depend on 2.6 yet...
class RevCache(tuple):
    'RevCache(youngest_rev, oldest_rev, rev_dict, tag_set, srev_dict, branch_dict)'
 
    __slots__ = ()
    _fields = ('youngest_rev', 'oldest_rev', 'rev_dict', 'tag_set', 'srev_dict', 'branch_dict')
 
    def __new__(cls, youngest_rev, oldest_rev, rev_dict, tag_set, srev_dict, branch_dict):
        return tuple.__new__(cls, (youngest_rev, oldest_rev, rev_dict, tag_set, srev_dict, branch_dict))
 
    @classmethod
    def _make(cls, iterable, new=tuple.__new__, len=len):
        'Make a new RevCache object from a sequence or iterable'
        result = new(cls, iterable)
        if len(result) != 6:
            raise TypeError('Expected 6 arguments, got %d' % len(result))
        return result
 
    def __repr__(self):
        return 'RevCache(youngest_rev=%r, oldest_rev=%r, rev_dict=%r, tag_set=%r, srev_dict=%r, branch_dict=%r)' % self
 
    def _asdict(t):
        'Return a new dict which maps field names to their values'
        return {'youngest_rev': t[0], 'oldest_rev': t[1], 'rev_dict': t[2], 'tag_set': t[3], 'srev_dict': t[4], 'branch_dict': t[5]}
 
    def _replace(self, **kwds):
        'Return a new RevCache object replacing specified fields with new values'
        result = self._make(map(kwds.pop, ('youngest_rev', 'oldest_rev', 'rev_dict', 'tag_set', 'srev_dict', 'branch_dict'), self))
        if kwds:
            raise ValueError('Got unexpected field names: %r' % kwds.keys())
        return result
 
    def __getnewargs__(self):
        return tuple(self)
 
    youngest_rev = property(itemgetter(0))
    oldest_rev = property(itemgetter(1))
    rev_dict = property(itemgetter(2))
    tag_set = property(itemgetter(3))
    srev_dict = property(itemgetter(4))
    branch_dict = property(itemgetter(5))
 
 
class Storage(object):
    """
    High-level wrapper around GitCore with in-memory caching
    """
 
    __SREV_MIN = 4 # minimum short-rev length
 
    @staticmethod
    def __rev_key(rev):
        assert len(rev) >= 4
        #assert GitCore.is_sha(rev)
        srev_key = int(rev[:4], 16)
        assert srev_key >= 0 and srev_key <= 0xffff
        return srev_key
 
    @staticmethod
    def git_version(git_bin="git"):
        GIT_VERSION_MIN_REQUIRED = (1, 5, 6)
        try:
            g = GitCore(git_bin=git_bin)
            [v] = g.version().splitlines()
            _, _, version = v.strip().split()
            # 'version' has usually at least 3 numeric version components, e.g.::
            #  1.5.4.2
            #  1.5.4.3.230.g2db511
            #  1.5.4.GIT
 
            def try_int(s):
                try:
                    return int(s)
                except ValueError:
                    return s
 
            split_version = tuple(map(try_int, version.split('.')))
 
            result = {}
            result['v_str'] = version
            result['v_tuple'] = split_version
            result['v_min_tuple'] = GIT_VERSION_MIN_REQUIRED
            result['v_min_str'] = ".".join(map(str, GIT_VERSION_MIN_REQUIRED))
            result['v_compatible'] = split_version >= GIT_VERSION_MIN_REQUIRED
            return result
 
        except Exception, e:
            raise GitError("Could not retrieve GIT version"
                           " (tried to execute/parse '%s --version' but got %s)"
                           % (git_bin, repr(e)))
 
 
    def __init__(self, git_dir, log, git_bin='git', git_fs_encoding=None):
        """
        Initialize PyGit.Storage instance
 
        `git_dir`: path to .git folder;
                this setting is not affected by the `git_fs_encoding` setting
 
        `log`: logger instance
 
        `git_bin`: path to executable
                this setting is not affected by the `git_fs_encoding` setting
 
        `git_fs_encoding`: encoding used for paths stored in git repository;
                if `None`, no implicit decoding/encoding to/from
                unicode objects is performed, and bytestrings are
                returned instead
 
        """
 
        self.logger = log
 
        if git_fs_encoding is not None:
            # validate encoding name
            codecs.lookup(git_fs_encoding)
 
            # setup conversion functions
            self._fs_to_unicode = lambda s: s.decode(git_fs_encoding)
            self._fs_from_unicode = lambda s: s.encode(git_fs_encoding)
        else:
            # pass bytestrings as-is w/o any conversion
            self._fs_to_unicode = self._fs_from_unicode = lambda s: s
 
        # simple sanity checking
        #__git_file_path = partial(os.path.join, git_dir)
        __git_file_path = lambda *args: os.path.join(git_dir, *args)
        if not all(map(os.path.exists,
                       map(__git_file_path,
                           ['HEAD','objects','refs']))):
            self.logger.error("GIT control files missing in '%s'" % git_dir)
            if os.path.exists(__git_file_path('.git')):
                self.logger.error("entry '.git' found in '%s'"
                                  " -- maybe use that folder instead..." % git_dir)
            raise GitError("GIT control files not found, maybe wrong directory?")
 
        self.logger.debug("PyGIT.Storage instance %d constructed" % id(self))
 
        self.repo = GitCore(git_dir, git_bin=git_bin)
 
        self.commit_encoding = None
 
        # caches
        self.__rev_cache = None
        self.__rev_cache_lock = Lock()
 
        # cache the last 200 commit messages
        self.__commit_msg_cache = SizedDict(200)
        self.__commit_msg_lock = Lock()
 
    def __del__(self):
        self.logger.debug("PyGIT.Storage instance %d destructed" % id(self))
 
    #
    # cache handling
    #
 
    # called by Storage.sync()
    def __rev_cache_sync(self, youngest_rev=None):
        "invalidates revision db cache if necessary"
 
        # with self.__rev_cache_lock:
        self.__rev_cache_lock.acquire()
        try:
            need_update = False
            if self.__rev_cache:
                last_youngest_rev = self.__rev_cache.youngest_rev
                if last_youngest_rev != youngest_rev:
                    self.logger.debug("invalidated caches (%s != %s)" % (last_youngest_rev, youngest_rev))
                    need_update = True
            else:
                need_update = True # almost NOOP
 
            if need_update:
                self.__rev_cache = None
 
            return need_update
 
        finally:
            self.__rev_cache_lock.release()
 
    def get_rev_cache(self):
        """
        Retrieve revision cache
 
        may rebuild cache on the fly if required
 
        returns RevCache tupel
        """
 
        # with self.__rev_cache_lock:
        self.__rev_cache_lock.acquire()
        try:
            if self.__rev_cache is None: # can be cleared by Storage.__rev_cache_sync()
                self.logger.debug("triggered rebuild of commit tree db for %d" % id(self))
                ts0 = time.time()
 
                youngest = None
                oldest = None
                new_db = {} # db
                new_sdb = {} # short_rev db
 
                # helper for reusing strings
                __rev_seen = {}
                def __rev_reuse(rev):
                    rev = str(rev)
                    return __rev_seen.setdefault(rev, rev)
 
                new_tags = set(__rev_reuse(rev.strip()) for rev in self.repo.rev_parse("--tags").splitlines())
 
                new_branches = [(k, __rev_reuse(v)) for k, v in self._get_branches()]
                head_revs = set(v for _, v in new_branches)
 
                rev = ord_rev = 0
                for ord_rev, revs in enumerate(self.repo.rev_list("--parents",
                                                                  "--topo-order",
                                                                  "--all").splitlines()):
                    revs = map(__rev_reuse, revs.strip().split())
 
                    rev = revs[0]
 
                    # first rev seen is assumed to be the youngest one
                    if not ord_rev:
                        youngest = rev
 
                    # shortrev "hash" map
                    srev_key = self.__rev_key(rev)
                    new_sdb.setdefault(srev_key, []).append(rev)
 
                    # parents
                    parents = tuple(revs[1:])
 
                    # new_db[rev] = (children(rev), parents(rev), ordinal_id(rev), rheads(rev))
                    if rev in new_db:
                        # (incomplete) entry was already created by children
                        _children, _parents, _ord_rev, _rheads = new_db[rev]
                        assert _children
                        assert not _parents
                        assert _ord_rev == 0
 
                        if rev in head_revs and rev not in _rheads:
                            _rheads.append(rev)
 
                    else: # new entry
                        _children = []
                        #_rheads = [rev] if rev in head_revs else []
                        if rev in head_revs:
                            _rheads = [rev]
                        else:
                            _rheads = []
 
                    # create/update entry -- transform lists into tuples since entry will be final
                    new_db[rev] = tuple(_children), tuple(parents), ord_rev + 1, tuple(_rheads)
 
                    # update parents(rev)s
                    for parent in parents:
                        # by default, a dummy ordinal_id is used for the mean-time
                        _children, _parents, _ord_rev, _rheads2 = new_db.setdefault(parent, ([], [], 0, []))
 
                        # update parent(rev)'s children
                        if rev not in _children:
                            _children.append(rev)
 
                        # update parent(rev)'s rheads
                        for rev in _rheads:
                            if rev not in _rheads2:
                                _rheads2.append(rev)
 
                # last rev seen is assumed to be the oldest one (with highest ord_rev)
                oldest = rev
 
                __rev_seen = None
 
                # convert sdb either to dict or array depending on size
                #tmp = [()]*(max(new_sdb.keys())+1) if len(new_sdb) > 5000 else {}
                if len(new_sdb) > 5000:
                    tmp = [()]*(max(new_sdb.keys())+1)
                else:
                    tmp = {}
 
                try:
                    while True:
                        k, v = new_sdb.popitem()
                        tmp[k] = tuple(v)
                except KeyError:
                    pass
 
                assert len(new_sdb) == 0
                new_sdb = tmp
 
                # atomically update self.__rev_cache
                self.__rev_cache = RevCache(youngest, oldest, new_db, new_tags, new_sdb, new_branches)
                ts1 = time.time()
                self.logger.debug("rebuilt commit tree db for %d with %d entries (took %.1f ms)"
                                  % (id(self), len(new_db), 1000*(ts1-ts0)))
 
            assert all(e is not None for e in self.__rev_cache) or not any(self.__rev_cache)
 
            return self.__rev_cache
        finally:
            self.__rev_cache_lock.release()
        # with self.__rev_cache_lock
 
    # see RevCache namedtupel
    rev_cache = property(get_rev_cache)
 
    def _get_branches(self):
        "returns list of (local) branches, with active (= HEAD) one being the first item"
 
        result = []
        for e in self.repo.branch("-v", "--no-abbrev").splitlines():
            bname, bsha = e[1:].strip().split()[:2]
            if e.startswith('*'):
                result.insert(0, (bname, bsha))
            else:
                result.append((bname, bsha))
 
        return result
 
    def get_branches(self):
        "returns list of (local) branches, with active (= HEAD) one being the first item"
        return self.rev_cache.branch_dict
 
    def get_commits(self):
        return self.rev_cache.rev_dict
 
    def oldest_rev(self):
        return self.rev_cache.oldest_rev
 
    def youngest_rev(self):
        return self.rev_cache.youngest_rev
 
    def get_branch_contains(self, sha, resolve=False):
        """
        return list of reachable head sha ids or (names, sha) pairs if resolve is true
 
        see also get_branches()
        """
 
        _rev_cache = self.rev_cache
 
        try:
            rheads = _rev_cache.rev_dict[sha][3]
        except KeyError:
            return []
 
        if resolve:
            return [ (k, v) for k, v in _rev_cache.branch_dict if v in rheads ]
 
        return rheads
 
    def history_relative_rev(self, sha, rel_pos):
        db = self.get_commits()
 
        if sha not in db:
            raise GitErrorSha()
 
        if rel_pos == 0:
            return sha
 
        lin_rev = db[sha][2] + rel_pos
 
        if lin_rev < 1 or lin_rev > len(db):
            return None
 
        for k, v in db.iteritems():
            if v[2] == lin_rev:
                return k
 
        # should never be reached if db is consistent
        raise GitError("internal inconsistency detected")
 
    def hist_next_revision(self, sha):
        return self.history_relative_rev(sha, -1)
 
    def hist_prev_revision(self, sha):
        return self.history_relative_rev(sha, +1)
 
    def get_commit_encoding(self):
        if self.commit_encoding is None:
            self.commit_encoding = \
                self.repo.repo_config("--get", "i18n.commitEncoding").strip() or 'utf-8'
 
        return self.commit_encoding
 
    def head(self):
        "get current HEAD commit id"
        return self.verifyrev("HEAD")
 
    def verifyrev(self, rev):
        "verify/lookup given revision object and return a sha id or None if lookup failed"
        rev = str(rev)
 
        _rev_cache = self.rev_cache
 
        if GitCore.is_sha(rev):
            # maybe it's a short or full rev
            fullrev = self.fullrev(rev)
            if fullrev:
                return fullrev
 
        # fall back to external git calls
        rc = self.repo.rev_parse("--verify", rev).strip()
        if not rc:
            return None
 
        if rc in _rev_cache.rev_dict:
            return rc
 
        if rc in _rev_cache.tag_set:
            sha = self.repo.cat_file("tag", rc).split(None, 2)[:2]
            if sha[0] != 'object':
                self.logger.debug("unexpected result from 'git-cat-file tag %s'" % rc)
                return None
            return sha[1]
 
        return None
 
    def shortrev(self, rev, min_len=7):
        "try to shorten sha id"
        #try to emulate the following:
        #return self.repo.rev_parse("--short", str(rev)).strip()
        rev = str(rev)
 
        if min_len < self.__SREV_MIN:
            min_len = self.__SREV_MIN
 
        _rev_cache = self.rev_cache
 
        if rev not in _rev_cache.rev_dict:
            return None
 
        srev = rev[:min_len]
        srevs = set(_rev_cache.srev_dict[self.__rev_key(rev)])
 
        if len(srevs) == 1:
            return srev # we already got a unique id
 
        # find a shortened id for which rev doesn't conflict with
        # the other ones from srevs
        crevs = srevs - set([rev])
 
        for l in range(min_len+1, 40):
            srev = rev[:l]
            if srev not in [ r[:l] for r in crevs ]:
                return srev
 
        return rev # worst-case, all except the last character match
 
    def fullrev(self, srev):
        "try to reverse shortrev()"
        srev = str(srev)
 
        _rev_cache = self.rev_cache
 
        # short-cut
        if len(srev) == 40 and srev in _rev_cache.rev_dict:
            return srev
 
        if not GitCore.is_sha(srev):
            return None
 
        try:
            srevs = _rev_cache.srev_dict[self.__rev_key(srev)]
        except KeyError:
            return None
 
        srevs = filter(lambda s: s.startswith(srev), srevs)
        if len(srevs) == 1:
            return srevs[0]
 
        return None
 
    def get_tags(self):
        return [ e.strip() for e in self.repo.tag("-l").splitlines() ]
 
    def ls_tree(self, rev, path=""):
        rev = rev and str(rev) or 'HEAD' # paranoia
 
        path = self._fs_from_unicode(path)
 
        if path.startswith('/'):
            path = path[1:]
 
        tree = self.repo.ls_tree("-z", "-l", rev, "--", path).split('\0')
 
        def split_ls_tree_line(l):
            "split according to '<mode> <type> <sha> <size>\t<fname>'"
 
            meta, fname = l.split('\t', 1)
            _mode, _type, _sha, _size = meta.split()
 
            if _size == '-':
                _size = None
            else:
                _size = int(_size)
 
            return _mode, _type, _sha, _size, self._fs_to_unicode(fname)
 
        return [ split_ls_tree_line(e) for e in tree if e ]
 
    def read_commit(self, commit_id):
        if not commit_id:
            raise GitError("read_commit called with empty commit_id")
 
        commit_id, commit_id_orig = self.fullrev(commit_id), commit_id
 
        db = self.get_commits()
        if commit_id not in db:
            self.logger.info("read_commit failed for '%s' ('%s')" %
                             (commit_id, commit_id_orig))
            raise GitErrorSha
 
        #with self.__commit_msg_lock:
        self.__commit_msg_lock.acquire()
        try:
            if self.__commit_msg_cache.has_key(commit_id):
                # cache hit
                result = self.__commit_msg_cache[commit_id]
                return result[0], dict(result[1])
 
            # cache miss
            raw = self.repo.cat_file("commit", commit_id)
            raw = unicode(raw, self.get_commit_encoding(), 'replace')
            lines = raw.splitlines()
 
            if not lines:
                raise GitErrorSha
 
            line = lines.pop(0)
            props = {}
            while line:
                key, value = line.split(None, 1)
                props.setdefault(key, []).append(value.strip())
                line = lines.pop(0)
 
            result = ("\n".join(lines), props)
 
            self.__commit_msg_cache[commit_id] = result
 
            return result[0], dict(result[1])
        finally:
            self.__commit_msg_lock.release()
 
    def get_file(self, sha):
        return cStringIO.StringIO(self.repo.cat_file("blob", str(sha)))
 
    def get_obj_size(self, sha):
        sha = str(sha)
 
        try:
            obj_size = int(self.repo.cat_file("-s", sha).strip())
        except ValueError:
            raise GitErrorSha("object '%s' not found" % sha)
 
        return obj_size
 
    def children(self, sha):
        db = self.get_commits()
 
        try:
            return list(db[sha][0])
        except KeyError:
            return []
 
    def children_recursive(self, sha, rev_dict=None):
        """
        Recursively traverse children in breadth-first order
        """
 
        if rev_dict is None:
            rev_dict = self.get_commits()
 
        work_list = deque()
        seen = set()
 
        seen.update(rev_dict[sha][0])
        work_list.extend(rev_dict[sha][0])
 
        while work_list:
            p = work_list.popleft()
            yield p
 
            _children = set(rev_dict[p][0]) - seen
 
            seen.update(_children)
            work_list.extend(_children)
 
        assert len(work_list) == 0
 
    def parents(self, sha):
        db = self.get_commits()
 
        try:
            return list(db[sha][1])
        except KeyError:
            return []
 
    def all_revs(self):
        return self.get_commits().iterkeys()
 
    def sync(self):
        rev = self.repo.rev_list("--max-count=1", "--topo-order", "--all").strip()
        return self.__rev_cache_sync(rev)
 
    def last_change(self, sha, path):
        return self.repo.rev_list("--max-count=1",
                                  sha, "--",
                                  self._fs_from_unicode(path)).strip() or None
 
    def history(self, sha, path, limit=None):
        if limit is None:
            limit = -1
 
        tmp = self.repo.rev_list("--max-count=%d" % limit, str(sha), "--",
                                 self._fs_from_unicode(path))
 
        return [ rev.strip() for rev in tmp.splitlines() ]
 
    def history_timerange(self, start, stop):
        return [ rev.strip() for rev in \
                     self.repo.rev_list("--reverse",
                                        "--max-age=%d" % start,
                                        "--min-age=%d" % stop,
                                        "--all").splitlines() ]
 
    def rev_is_anchestor_of(self, rev1, rev2):
        """return True if rev2 is successor of rev1"""
 
        rev1 = rev1.strip()
        rev2 = rev2.strip()
 
        rev_dict = self.get_commits()
 
        return (rev2 in rev_dict and
                rev2 in self.children_recursive(rev1, rev_dict))
 
    def blame(self, commit_sha, path):
        in_metadata = False
 
        path = self._fs_from_unicode(path)
 
        for line in self.repo.blame("-p", "--", path, str(commit_sha)).splitlines():
            assert line
            if in_metadata:
                in_metadata = not line.startswith('\t')
            else:
                split_line = line.split()
                if len(split_line) == 4:
                    (sha, orig_lineno, lineno, group_size) = split_line
                else:
                    (sha, orig_lineno, lineno) = split_line
 
                assert len(sha) == 40
                yield (sha, lineno)
                in_metadata = True
 
        assert not in_metadata
 
    def diff_tree(self, tree1, tree2, path="", find_renames=False):
        """calls `git diff-tree` and returns tuples of the kind
        (mode1,mode2,obj1,obj2,action,path1,path2)"""
 
        # diff-tree returns records with the following structure:
        # :<old-mode> <new-mode> <old-sha> <new-sha> <change> NUL <old-path> NUL [ <new-path> NUL ]
 
        path = self._fs_from_unicode(path).strip("/")
        diff_tree_args = ["-z", "-r"]
        if find_renames:
            diff_tree_args.append("-M")
        #diff_tree_args.extend([str(tree1) if tree1 else "--root",
        #                       str(tree2),
        #                       "--", path])
        if tree1:
            diff_tree_args.append(str(tree1))
        else:
            diff_tree_args.append("--root")
        diff_tree_args.extend([str(tree2),
                               "--", path])
 
        lines = self.repo.diff_tree(*diff_tree_args).split('\0')
 
        assert lines[-1] == ""
        del lines[-1]
 
        if tree1 is None and lines:
            # if only one tree-sha is given on commandline,
            # the first line is just the redundant tree-sha itself...
            assert not lines[0].startswith(':')
            del lines[0]
 
        # FIXME: the following code is ugly, needs rewrite
 
        chg = None
 
        def __chg_tuple():
            if len(chg) == 6:
                chg.append(None)
            else:
                chg[6] = self._fs_to_unicode(chg[6])
            chg[5] = self._fs_to_unicode(chg[5])
 
            assert len(chg) == 7
            return tuple(chg)
 
        for line in lines:
            if line.startswith(':'):
                if chg:
                    yield __chg_tuple()
 
                chg = line[1:].split()
                assert len(chg) == 5
            else:
                chg.append(line)
 
        # handle left-over chg entry
        if chg:
            yield __chg_tuple()
 
############################################################################
############################################################################
############################################################################
 
def main():
    import logging, timeit
 
    assert not GitCore.is_sha("123")
    assert GitCore.is_sha("1a3f")
    assert GitCore.is_sha("f"*40)
    assert not GitCore.is_sha("x"+"f"*39)
    assert not GitCore.is_sha("f"*41)
 
    print "git version [%s]" % str(Storage.git_version())
 
    # custom linux hack reading `/proc/<PID>/statm`
    if sys.platform == "linux2":
        __pagesize = os.sysconf('SC_PAGESIZE')
 
        def proc_statm(pid = os.getpid()):
            __proc_statm = '/proc/%d/statm' % pid
            try:
                t = open(__proc_statm)
                result = t.read().split()
                t.close()
                assert len(result) == 7
                return tuple([ __pagesize*int(p) for p in result ])
            except:
                raise RuntimeError("failed to get memory stats")
 
    else: # not linux2
        print "WARNING - meminfo.proc_statm() not available"
        def proc_statm():
            return (0,)*7
 
    print "statm =", proc_statm()
    __data_size = proc_statm()[5]
    __data_size_last = [__data_size]
 
    def print_data_usage():
        __tmp = proc_statm()[5]
        print "DATA: %6d %+6d" % (__tmp - __data_size, __tmp - __data_size_last[0])
        __data_size_last[0] = __tmp
 
    print_data_usage()
 
    g = Storage(sys.argv[1], logging)
 
    print_data_usage()
 
    print "[%s]" % g.head()
    print g.ls_tree(g.head())
    print "--------------"
    print_data_usage()
    print g.read_commit(g.head())
    print "--------------"
    print_data_usage()
    p = g.parents(g.head())
    print list(p)
    print "--------------"
    print list(g.children(list(p)[0]))
    print list(g.children(list(p)[0]))
    print "--------------"
    print g.get_commit_encoding()
    print "--------------"
    print g.get_branches()
    print "--------------"
    print g.hist_prev_revision(g.oldest_rev()), g.oldest_rev(), g.hist_next_revision(g.oldest_rev())
    print_data_usage()
    print "--------------"
    p = g.youngest_rev()
    print g.hist_prev_revision(p), p, g.hist_next_revision(p)
    print "--------------"
 
    p = g.head()
    for i in range(-5, 5):
        print i, g.history_relative_rev(p, i)
 
    # check for loops
    def check4loops(head):
        print "check4loops", head
        seen = set([head])
        for _sha in g.children_recursive(head):
            if _sha in seen:
                print "dupe detected :-/", _sha, len(seen)
            seen.add(_sha)
        return seen
 
    print len(check4loops(g.parents(g.head())[0]))
 
    #p = g.head()
    #revs = [ g.history_relative_rev(p, i) for i in range(0,10) ]
    print_data_usage()
    revs = g.get_commits().keys()
    print_data_usage()
 
    def shortrev_test():
        for i in revs:
            i = str(i)
            s = g.shortrev(i, min_len=4)
            assert i.startswith(s)
            assert g.fullrev(s) == i
 
    # iters = 1
    # print "timing %d*shortrev_test()..." % len(revs)
    # t = timeit.Timer("shortrev_test()", "from __main__ import shortrev_test")
    # print "%.2f usec/rev" % (1000000 * t.timeit(number=iters)/len(revs))
 
    #print len(check4loops(g.oldest_rev()))
    #print len(list(g.children_recursive(g.oldest_rev())))
 
    print_data_usage()
 
    # perform typical trac operations:
 
    if 1:
        print "--------------"
        rev = g.head()
        for mode, _type, sha, _size, name in g.ls_tree(rev):
            [last_rev] = g.history(rev, name, limit=1)
            #s = g.get_obj_size(sha) if _type == "blob" else 0
            if type == "blob":
                s = g.get_obj_size(sha)
            else:
                s = 0
            msg = g.read_commit(last_rev)
 
            print "%s %s %10d [%s]" % (_type, last_rev, s, name)
 
    print "allocating 2nd instance"
    print_data_usage()
    g2 = Storage(sys.argv[1], logging)
    g2.head()
    print_data_usage()
 
    print "allocating 3rd instance"
    g3 = Storage(sys.argv[1], logging)
    g3.head()
    print_data_usage()
 
if __name__ == '__main__':
    main()