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mapping.py
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# Copyright (C) 2007 Canonical Ltd
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# Copyright (C) 2008-2009 Jelmer Vernooij <jelmer@samba.org>
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# Copyright (C) 2008 John Carr
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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
18
 
 
19
 
"""Converters, etc for going between Bazaar and Git ids."""
20
 
 
21
 
from bzrlib import errors, foreign, urlutils
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from bzrlib.inventory import ROOT_ID
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from bzrlib.foreign import (
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        ForeignVcs, 
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        VcsMappingRegistry, 
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        ForeignRevision,
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        )
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29
 
def escape_file_id(file_id):
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    return file_id.replace('_', '__').replace(' ', '_s')
31
 
 
32
 
 
33
 
def unescape_file_id(file_id):
34
 
    return file_id.replace("_s", " ").replace("__", "_")
35
 
 
36
 
 
37
 
class BzrGitMapping(foreign.VcsMapping):
38
 
    """Class that maps between Git and Bazaar semantics."""
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    experimental = False
40
 
 
41
 
    def __init__(self):
42
 
        super(BzrGitMapping, self).__init__(foreign_git)
43
 
 
44
 
    def __eq__(self, other):
45
 
        return type(self) == type(other) and self.revid_prefix == other.revid_prefix
46
 
 
47
 
    @classmethod
48
 
    def revision_id_foreign_to_bzr(cls, git_rev_id):
49
 
        """Convert a git revision id handle to a Bazaar revision id."""
50
 
        return "%s:%s" % (cls.revid_prefix, git_rev_id)
51
 
 
52
 
    @classmethod
53
 
    def revision_id_bzr_to_foreign(cls, bzr_rev_id):
54
 
        """Convert a Bazaar revision id to a git revision id handle."""
55
 
        if not bzr_rev_id.startswith("%s:" % cls.revid_prefix):
56
 
            raise errors.InvalidRevisionId(bzr_rev_id, cls)
57
 
        return bzr_rev_id[len(cls.revid_prefix)+1:], cls()
58
 
 
59
 
    def generate_file_id(self, path):
60
 
        if path == "":
61
 
            return ROOT_ID
62
 
        return escape_file_id(path.encode('utf-8'))
63
 
 
64
 
    def import_commit(self, commit):
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        """Convert a git commit to a bzr revision.
66
 
 
67
 
        :return: a `bzrlib.revision.Revision` object.
68
 
        """
69
 
        if commit is None:
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            raise AssertionError("Commit object can't be None")
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        rev = ForeignRevision(commit.id, self, self.revision_id_foreign_to_bzr(commit.id))
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        rev.parent_ids = tuple([self.revision_id_foreign_to_bzr(p) for p in commit.parents])
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        rev.message = commit.message.decode("utf-8", "replace")
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        rev.committer = str(commit.committer).decode("utf-8", "replace")
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        if commit.committer != commit.author:
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            rev.properties['author'] = str(commit.author).decode("utf-8", "replace")
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        rev.timestamp = commit.commit_time
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        rev.timezone = 0
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        return rev
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81
 
 
82
 
class BzrGitMappingv1(BzrGitMapping):
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    revid_prefix = 'git-v1'
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    experimental = False
85
 
 
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class BzrGitMappingExperimental(BzrGitMappingv1):
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    revid_prefix = 'git-experimental'
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    experimental = True
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class GitMappingRegistry(VcsMappingRegistry):
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    def revision_id_bzr_to_foreign(self, bzr_revid):
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        if not bzr_revid.startswith("git-"):
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            raise errors.InvalidRevisionId(bzr_revid, None)
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        (mapping_version, git_sha) = bzr_revid.split(":", 1)
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        mapping = self.get(mapping_version)
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        return mapping.revision_id_bzr_to_foreign(bzr_revid)
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101
 
    parse_revision_id = revision_id_bzr_to_foreign
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103
 
 
104
 
mapping_registry = GitMappingRegistry()
105
 
mapping_registry.register_lazy('git-v1', "bzrlib.plugins.git.mapping",
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                                   "BzrGitMappingv1")
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mapping_registry.register_lazy('git-experimental', "bzrlib.plugins.git.mapping",
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                                   "BzrGitMappingExperimental")
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110
 
 
111
 
class ForeignGit(ForeignVcs):
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    """Foreign Git."""
113
 
 
114
 
    def __init__(self):
115
 
        super(ForeignGit, self).__init__(mapping_registry)
116
 
 
117
 
    @classmethod
118
 
    def show_foreign_revid(cls, foreign_revid):
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        return { "git commit": foreign_revid }
120
 
 
121
 
 
122
 
foreign_git = ForeignGit()
123
 
default_mapping = BzrGitMappingv1()
124
 
 
125
 
 
126
 
def inventory_to_tree_and_blobs(repo, mapping, revision_id):
127
 
    from dulwich.objects import Tree, Blob
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    from bzrlib.inventory import InventoryDirectory, InventoryFile
129
 
    import stat
130
 
    stack = []
131
 
    cur = ""
132
 
    tree = Tree()
133
 
 
134
 
    inv = repo.get_inventory(revision_id)
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    # stack contains the set of trees that we haven't 
137
 
    # finished constructing
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    for path, entry in inv.iter_entries():
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        while stack and not path.startswith(cur):
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            tree.serialize()
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            sha = tree.sha().hexdigest()
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            yield sha, tree, cur
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            t = (stat.S_IFDIR, urlutils.basename(cur).encode('UTF-8'), sha)
144
 
            cur, tree = stack.pop()
145
 
            tree.add(*t)
146
 
 
147
 
        if type(entry) == InventoryDirectory:
148
 
            stack.append((cur, tree))
149
 
            cur = path
150
 
            tree = Tree()
151
 
 
152
 
        if type(entry) == InventoryFile:
153
 
            #FIXME: We can make potentially make this Lazy to avoid shaing lots of stuff
154
 
            # and having all these objects in memory at once
155
 
            blob = Blob()
156
 
            _, blob._text = repo.iter_files_bytes([(entry.file_id, entry.revision, path)]).next()
157
 
            sha = blob.sha().hexdigest()
158
 
            yield sha, blob, path
159
 
 
160
 
            name = urlutils.basename(path).encode("utf-8")
161
 
            mode = stat.S_IFREG | 0644
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            if entry.executable:
163
 
                mode |= 0111
164
 
            tree.add(mode, name, sha)
165
 
 
166
 
    while len(stack) > 1:
167
 
        tree.serialize()
168
 
        sha = tree.sha().hexdigest()
169
 
        yield sha, tree, cur
170
 
        t = (stat.S_IFDIR, urlutils.basename(cur).encode('UTF-8'), sha)
171
 
        cur, tree = stack.pop()
172
 
        tree.add(*t)
173
 
 
174
 
    tree.serialize()
175
 
    yield tree.sha().hexdigest(), tree, cur
176
 
 
177
 
 
178
 
def revision_to_commit(rev, tree_sha, parent_lookup):
179
 
    """Turn a Bazaar revision in to a Git commit
180
 
 
181
 
    :param tree_sha: Tree sha for the commit
182
 
    :param parent_lookup: Function for looking up the GIT sha equiv of a bzr revision
183
 
    :return dulwich.objects.Commit represent the revision:
184
 
    """
185
 
    from dulwich.objects import Commit
186
 
    commit = Commit()
187
 
    commit._tree = tree_sha
188
 
    for p in rev.parent_ids:
189
 
        git_p = parent_lookup(p)
190
 
        if git_p is not None:
191
 
            commit._parents.append(git_p)
192
 
    commit._message = rev.message.encode("utf-8")
193
 
    commit._committer = rev.committer.encode("utf-8")
194
 
    commit._author = rev.get_apparent_authors()[0].encode("utf-8")
195
 
    commit._commit_time = long(rev.timestamp)
196
 
    commit.serialize()
197
 
    return commit