/brz/remove-bazaar

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Add convenience command for accessing virtual git refs.

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dir.py
 
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# Copyright (C) 2007 Canonical Ltd
 
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#
 
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# This program is free software; you can redistribute it and/or modify
 
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# it under the terms of the GNU General Public License as published by
 
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# the Free Software Foundation; either version 2 of the License, or
 
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# (at your option) any later version.
 
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#
 
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# This program is distributed in the hope that it will be useful,
 
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
 
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 
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# GNU General Public License for more details.
 
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#
 
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# You should have received a copy of the GNU General Public License
 
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# along with this program; if not, write to the Free Software
 
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
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"""An adapter between a Git control dir and a Bazaar BzrDir."""
 
18
 
 
19
from bzrlib import (
 
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    bzrdir,
 
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    errors as bzr_errors,
 
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    lockable_files,
 
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    urlutils,
 
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    version_info as bzrlib_version,
 
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    )
 
26
 
 
27
LockWarner = getattr(lockable_files, "_LockWarner", None)
 
28
 
 
29
from bzrlib.plugins.git import (
 
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    LocalGitBzrDirFormat,
 
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    get_rich_root_format,
 
32
    )
 
33
 
 
34
 
 
35
class GitLock(object):
 
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    """A lock that thunks through to Git."""
 
37
 
 
38
    def lock_write(self, token=None):
 
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        pass
 
40
 
 
41
    def lock_read(self):
 
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        pass
 
43
 
 
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    def unlock(self):
 
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        pass
 
46
 
 
47
    def peek(self):
 
48
        pass
 
49
 
 
50
    def validate_token(self, token):
 
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        pass
 
52
 
 
53
    def break_lock(self):
 
54
        pass
 
55
 
 
56
 
 
57
class GitLockableFiles(lockable_files.LockableFiles):
 
58
    """Git specific lockable files abstraction."""
 
59
 
 
60
    def __init__(self, transport, lock):
 
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        self._lock = lock
 
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        self._transaction = None
 
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        self._lock_mode = None
 
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        self._transport = transport
 
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        if LockWarner is None:
 
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            # Bzr 1.13
 
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            self._lock_count = 0
 
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        else:
 
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            self._lock_warner = LockWarner(repr(self))
 
70
 
 
71
 
 
72
class GitDir(bzrdir.BzrDir):
 
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    """An adapter to the '.git' dir used by git."""
 
74
 
 
75
    def is_supported(self):
 
76
        return True
 
77
 
 
78
    def cloning_metadir(self, stacked=False):
 
79
        return get_rich_root_format(stacked)
 
80
 
 
81
    def _branch_name_to_ref(self, name):
 
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        raise NotImplementedError(self._branch_name_to_ref)
 
83
 
 
84
    if bzrlib_version >= (2, 2):
 
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        def open_branch(self, name=None, ignore_fallbacks=None,
 
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            unsupported=False):
 
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            return self._open_branch(name=name,
 
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                ignore_fallbacks=ignore_fallbacks, unsupported=unsupported)
 
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    else:
 
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        def open_branch(self, ignore_fallbacks=None, unsupported=False):
 
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            return self._open_branch(name=None,
 
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                ignore_fallbacks=ignore_fallbacks, unsupported=unsupported)
 
93
 
 
94
 
 
95
class LocalGitDir(GitDir):
 
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    """An adapter to the '.git' dir used by git."""
 
97
 
 
98
    def _get_gitrepository_class(self):
 
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        from bzrlib.plugins.git.repository import LocalGitRepository
 
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        return LocalGitRepository
 
101
 
 
102
    _gitrepository_class = property(_get_gitrepository_class)
 
103
 
 
104
    def __init__(self, transport, lockfiles, gitrepo, format):
 
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        self._format = format
 
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        self.root_transport = transport
 
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        self._git = gitrepo
 
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        if gitrepo.bare:
 
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            self.transport = transport
 
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        else:
 
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            self.transport = transport.clone('.git')
 
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        self._lockfiles = lockfiles
 
113
        self._mode_check_done = None
 
114
 
 
115
    def _branch_name_to_ref(self, name):
 
116
        from bzrlib.plugins.git.refs import branch_name_to_ref
 
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        if name in (None, "HEAD"):
 
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            from dulwich.repo import SYMREF
 
119
            refcontents = self._git.refs.read_ref("HEAD")
 
120
            if refcontents.startswith(SYMREF):
 
121
                name = refcontents[len(SYMREF):]
 
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            else:
 
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                name = "HEAD"
 
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        return branch_name_to_ref(name, "HEAD")
 
125
 
 
126
    def is_control_filename(self, filename):
 
127
        return filename == '.git' or filename.startswith('.git/')
 
128
 
 
129
    def get_branch_transport(self, branch_format):
 
130
        if branch_format is None:
 
131
            return self.transport
 
132
        if isinstance(branch_format, LocalGitBzrDirFormat):
 
133
            return self.transport
 
134
        raise bzr_errors.IncompatibleFormat(branch_format, self._format)
 
135
 
 
136
    get_repository_transport = get_branch_transport
 
137
    get_workingtree_transport = get_branch_transport
 
138
 
 
139
    def _open_branch(self, name=None, ignore_fallbacks=None, unsupported=False):
 
140
        """'create' a branch for this dir."""
 
141
        repo = self.open_repository()
 
142
        from bzrlib.plugins.git.branch import LocalGitBranch
 
143
        return LocalGitBranch(self, repo, self._branch_name_to_ref(name),
 
144
            self._lockfiles)
 
145
 
 
146
    def destroy_branch(self, name=None):
 
147
        del self._git.refs[self._branch_name_to_ref(name)]
 
148
 
 
149
    def list_branches(self):
 
150
        ret = []
 
151
        for name in self._git.get_refs():
 
152
            if name.startswith("refs/heads/"):
 
153
                ret.append(self.open_branch(name=name))
 
154
        return ret
 
155
 
 
156
    def open_repository(self, shared=False):
 
157
        """'open' a repository for this dir."""
 
158
        return self._gitrepository_class(self, self._lockfiles)
 
159
 
 
160
    def open_workingtree(self, recommend_upgrade=True):
 
161
        if not self._git.bare:
 
162
            from dulwich.errors import NoIndexPresent
 
163
            repo = self.open_repository()
 
164
            try:
 
165
                index = repo._git.open_index()
 
166
            except NoIndexPresent:
 
167
                pass
 
168
            else:
 
169
                from bzrlib.plugins.git.workingtree import GitWorkingTree
 
170
                return GitWorkingTree(self, repo, self.open_branch(), index)
 
171
        loc = urlutils.unescape_for_display(self.root_transport.base, 'ascii')
 
172
        raise bzr_errors.NoWorkingTree(loc)
 
173
 
 
174
    def create_repository(self, shared=False):
 
175
        return self.open_repository()
 
176
 
 
177
    def create_branch(self, name=None):
 
178
        refname = self._branch_name_to_ref(name)
 
179
        self._git.refs[refname] = "0" * 40
 
180
        return self.open_branch(name)
 
181
 
 
182
    def backup_bzrdir(self):
 
183
        if self._git.bare:
 
184
            self.root_transport.copy_tree(".git", ".git.backup")
 
185
            return (self.root_transport.abspath(".git"),
 
186
                    self.root_transport.abspath(".git.backup"))
 
187
        else:
 
188
            raise bzr_errors.BzrError("Unable to backup bare repositories")
 
189
 
 
190
    def create_workingtree(self, revision_id=None, from_branch=None,
 
191
        accelerator_tree=None, hardlink=False):
 
192
        if self._git.bare:
 
193
            raise bzr_errors.BzrError("Can't create working tree in a bare repo")
 
194
        from dulwich.index import write_index
 
195
        from dulwich.pack import SHA1Writer
 
196
        f = open(self.transport.local_abspath("index"), 'w+')
 
197
        try:
 
198
            f = SHA1Writer(f)
 
199
            write_index(f, [])
 
200
        finally:
 
201
            f.close()
 
202
        return self.open_workingtree()