/brz/remove-bazaar

# -*- coding: utf-8 -*-

# Copyright (C) 2008 Canonical Ltd

#

# 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.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

#

# Original Copyright (c) 2008 Adeodato Simó

# Original License: MIT (See exporters/bzr-fast-export.LICENSE)

#

# vim: fileencoding=utf-8

"""Core engine for the fast-export command."""

# TODO: if a new_git_branch below gets merged repeatedly, the tip of the branch

# is not updated (because the parent of commit is already merged, so we don't

# set new_git_branch to the previously used name)

from email.Utils import parseaddr

import sys, time

import bzrlib.branch

import bzrlib.revision

from bzrlib import (

    builtins,

    errors as bazErrors,

    osutils,

    progress,

    trace,

    )

from bzrlib.plugins.fastimport import helpers, marks_file

from fastimport import commands

from fastimport.helpers import binary_stream

def _get_output_stream(destination):

    if destination is None or destination == '-':

        return binary_stream(sys.stdout)

    elif destination.endswith('gz'):

        import gzip

        return gzip.open(destination, 'wb')

    else:

        return open(destination, 'wb')

class BzrFastExporter(object):

    def __init__(self, source, destination, git_branch=None, checkpoint=-1,

        import_marks_file=None, export_marks_file=None, revision=None,

        verbose=False, plain_format=False):

        """Export branch data in fast import format.

        :param plain_format: if True, 'classic' fast-import format is

          used without any extended features; if False, the generated

          data is richer and includes information like multiple

          authors, revision properties, etc.

        """

        self.source = source

        self.outf = _get_output_stream(destination)

        self.git_branch = git_branch

        self.checkpoint = checkpoint

        self.import_marks_file = import_marks_file

        self.export_marks_file = export_marks_file

        self.revision = revision

        self.excluded_revisions = set()

        self.plain_format = plain_format

        self._multi_author_api_available = hasattr(bzrlib.revision.Revision,

            'get_apparent_authors')

        self.properties_to_exclude = ['authors', 'author']

        # Progress reporting stuff

        self.verbose = verbose

        if verbose:

            self.progress_every = 100

        else:

            self.progress_every = 1000

        self._start_time = time.time()

        self._commit_total = 0

        # Load the marks and initialise things accordingly

        self.revid_to_mark = {}

        self.branch_names = {}

        if self.import_marks_file:

            marks_info = marks_file.import_marks(self.import_marks_file)

            if marks_info is not None:

                self.revid_to_mark = dict((r, m) for m, r in

                    marks_info[0].items())

                self.branch_names = marks_info[1]

    def interesting_history(self):

        if self.revision:

            rev1, rev2 = builtins._get_revision_range(self.revision,

                self.branch, "fast-export")

            start_rev_id = rev1.rev_id

            end_rev_id = rev2.rev_id

        else:

            start_rev_id = None

            end_rev_id = None

        self.note("Calculating the revisions to include ...")

        view_revisions = reversed([rev_id for rev_id, _, _, _ in

            self.branch.iter_merge_sorted_revisions(end_rev_id, start_rev_id)])

        # If a starting point was given, we need to later check that we don't

        # start emitting revisions from before that point. Collect the

        # revisions to exclude now ...

        if start_rev_id is not None:

            self.note("Calculating the revisions to exclude ...")

            self.excluded_revisions = set([rev_id for rev_id, _, _, _ in

                self.branch.iter_merge_sorted_revisions(start_rev_id)])

        return list(view_revisions)

    def run(self):

        # Open the source

        self.branch = bzrlib.branch.Branch.open_containing(self.source)[0]

        # Export the data

        self.branch.repository.lock_read()

        try:

            interesting = self.interesting_history()

            self._commit_total = len(interesting)

            self.note("Starting export of %d revisions ..." %

                self._commit_total)

            if not self.plain_format:

                self.emit_features()

            for revid in interesting:

                self.emit_commit(revid, self.git_branch)

            if self.branch.supports_tags():

                self.emit_tags()

        finally:

            self.branch.repository.unlock()

        # Save the marks if requested

        self._save_marks()

        self.dump_stats()

    def note(self, msg, *args):

        """Output a note but timestamp it."""

        msg = "%s %s" % (self._time_of_day(), msg)

        trace.note(msg, *args)

    def warning(self, msg, *args):

        """Output a warning but timestamp it."""

        msg = "%s WARNING: %s" % (self._time_of_day(), msg)

        trace.warning(msg, *args)

    def _time_of_day(self):

        """Time of day as a string."""

        # Note: this is a separate method so tests can patch in a fixed value

        return time.strftime("%H:%M:%S")

    def report_progress(self, commit_count, details=''):

        if commit_count and commit_count % self.progress_every == 0:

            if self._commit_total:

                counts = "%d/%d" % (commit_count, self._commit_total)

            else:

                counts = "%d" % (commit_count,)

            minutes = (time.time() - self._start_time) / 60

            rate = commit_count * 1.0 / minutes

            if rate > 10:

                rate_str = "at %.0f/minute " % rate

            else:

                rate_str = "at %.1f/minute " % rate

            self.note("%s commits exported %s%s" % (counts, rate_str, details))

    def dump_stats(self):

        time_required = progress.str_tdelta(time.time() - self._start_time)

        rc = len(self.revid_to_mark)

        self.note("Exported %d %s in %s",

            rc, helpers.single_plural(rc, "revision", "revisions"),

            time_required)

    def print_cmd(self, cmd):

        self.outf.write("%r\n" % cmd)

    def _save_marks(self):

        if self.export_marks_file:

            revision_ids = dict((m, r) for r, m in self.revid_to_mark.items())

            marks_file.export_marks(self.export_marks_file, revision_ids,

                self.branch_names)

    def is_empty_dir(self, tree, path):

        path_id = tree.path2id(path)

        if path_id is None:

            self.warning("Skipping empty_dir detection - no file_id for %s" %

                (path,))

            return False

        # Continue if path is not a directory

        if tree.kind(path_id) != 'directory':

            return False

        # Use treewalk to find the contents of our directory

        contents = list(tree.walkdirs(prefix=path))[0]

        if len(contents[1]) == 0:

            return True

        else:

            return False

    def emit_features(self):

        for feature in sorted(commands.FEATURE_NAMES):

            self.print_cmd(commands.FeatureCommand(feature))

    def emit_commit(self, revid, git_branch):

        if revid in self.revid_to_mark or revid in self.excluded_revisions:

            return

        # Get the Revision object

        try:

            revobj = self.branch.repository.get_revision(revid)

        except bazErrors.NoSuchRevision:

            # This is a ghost revision. Mark it as not found and next!

            self.revid_to_mark[revid] = -1

            return

        # Get the primary parent

        # TODO: Consider the excluded revisions when deciding the parents.

        # Currently, a commit with parents that are excluded ought to be

        # triggering the git_branch calculation below (and it is not).

        # IGC 20090824

        ncommits = len(self.revid_to_mark)

        nparents = len(revobj.parent_ids)

        if nparents == 0:

            if ncommits:

                # This is a parentless commit but it's not the first one

                # output. We need to create a new temporary branch for it

                # otherwise git-fast-import will assume the previous commit

                # was this one's parent

                git_branch = self._next_tmp_branch_name()

            parent = bzrlib.revision.NULL_REVISION

        else:

            parent = revobj.parent_ids[0]

        # Print the commit

        git_ref = 'refs/heads/%s' % (git_branch,)

        mark = ncommits + 1

        self.revid_to_mark[revid] = mark

        file_cmds = self._get_filecommands(parent, revid)

        self.print_cmd(self._get_commit_command(git_ref, mark, revobj,

            file_cmds))

        # Report progress and checkpoint if it's time for that

        self.report_progress(ncommits)

        if (self.checkpoint > 0 and ncommits

            and ncommits % self.checkpoint == 0):

            self.note("Exported %i commits - adding checkpoint to output"

                % ncommits)

            self._save_marks()

            self.print_cmd(commands.CheckpointCommand())

    def _get_name_email(self, user):

        if user.find('<') == -1:

            # If the email isn't inside <>, we need to use it as the name

            # in order for things to round-trip correctly.

            # (note: parseaddr('a@b.com') => name:'', email: 'a@b.com')

            name = user

            email = ''

        else:

            name, email = parseaddr(user)

        return name, email

    def _get_commit_command(self, git_ref, mark, revobj, file_cmds):

        # Get the committer and author info

        committer = revobj.committer

        name, email = self._get_name_email(committer)

        committer_info = (name, email, revobj.timestamp, revobj.timezone)

        if self._multi_author_api_available:

            more_authors = revobj.get_apparent_authors()

            author = more_authors.pop(0)

        else:

            more_authors = []

            author = revobj.get_apparent_author()

        if more_authors:

            name, email = self._get_name_email(author)

            author_info = (name, email, revobj.timestamp, revobj.timezone)

            more_author_info = []

            for a in more_authors:

                name, email = self._get_name_email(a)

                more_author_info.append(

                    (name, email, revobj.timestamp, revobj.timezone))

        elif author != committer:

            name, email = self._get_name_email(author)

            author_info = (name, email, revobj.timestamp, revobj.timezone)

            more_author_info = None

        else:

            author_info = None

            more_author_info = None

        # Get the parents in terms of marks

        non_ghost_parents = []

        for p in revobj.parent_ids:

            if p in self.excluded_revisions:

                continue

            try:

                parent_mark = self.revid_to_mark[p]

                non_ghost_parents.append(":%s" % parent_mark)

            except KeyError:

                # ghost - ignore

                continue

        if non_ghost_parents:

            from_ = non_ghost_parents[0]

            merges = non_ghost_parents[1:]

        else:

            from_ = None

            merges = None

        # Filter the revision properties. Some metadata (like the

        # author information) is already exposed in other ways so

        # don't repeat it here.

        if self.plain_format:

            properties = None

        else:

            properties = revobj.properties

            for prop in self.properties_to_exclude:

                try:

                    del properties[prop]

                except KeyError:

                    pass

        # Build and return the result

        return commands.CommitCommand(git_ref, mark, author_info,

            committer_info, revobj.message, from_, merges, iter(file_cmds),

            more_authors=more_author_info, properties=properties)

    def _get_revision_trees(self, parent, revision_id):

        try:

            tree_old = self.branch.repository.revision_tree(parent)

        except bazErrors.UnexpectedInventoryFormat:

            self.warning("Parent is malformed - diffing against previous parent")

            # We can't find the old parent. Let's diff against his parent

            pp = self.branch.repository.get_revision(parent)

            tree_old = self.branch.repository.revision_tree(pp.parent_ids[0])

        tree_new = None

        try:

            tree_new = self.branch.repository.revision_tree(revision_id)

        except bazErrors.UnexpectedInventoryFormat:

            # We can't really do anything anymore

            self.warning("Revision %s is malformed - skipping" % revision_id)

        return tree_old, tree_new

    def _get_filecommands(self, parent, revision_id):

        """Get the list of FileCommands for the changes between two revisions."""

        tree_old, tree_new = self._get_revision_trees(parent, revision_id)

        if not(tree_old and tree_new):

            # Something is wrong with this revision - ignore the filecommands

            return []

        changes = tree_new.changes_from(tree_old)

        # Make "modified" have 3-tuples, as added does

        my_modified = [ x[0:3] for x in changes.modified ]

        # The potential interaction between renames and deletes is messy.

        # Handle it here ...

        file_cmds, rd_modifies, renamed = self._process_renames_and_deletes(

            changes.renamed, changes.removed, revision_id, tree_old)

        # Map kind changes to a delete followed by an add

        for path, id_, kind1, kind2 in changes.kind_changed:

            path = self._adjust_path_for_renames(path, renamed, revision_id)

            # IGC: I don't understand why a delete is needed here.

            # In fact, it seems harmful? If you uncomment this line,

            # please file a bug explaining why you needed to.

            #file_cmds.append(commands.FileDeleteCommand(path))

            my_modified.append((path, id_, kind2))

        # Record modifications

        for path, id_, kind in changes.added + my_modified + rd_modifies:

            if kind == 'file':

                text = tree_new.get_file_text(id_)

                file_cmds.append(commands.FileModifyCommand(path,

                    helpers.kind_to_mode('file', tree_new.is_executable(id_)),

                    None, text))

            elif kind == 'symlink':

                file_cmds.append(commands.FileModifyCommand(path,

                    helpers.kind_to_mode('symlink', False),

                    None, tree_new.get_symlink_target(id_)))

            elif kind == 'directory':

                if not self.plain_format:

                    file_cmds.append(commands.FileModifyCommand(path,

                        helpers.kind_to_mode('directory', False),

                        None, None))

            else:

                self.warning("cannot export '%s' of kind %s yet - ignoring" %

                    (path, kind))

        return file_cmds

    def _process_renames_and_deletes(self, renames, deletes,

        revision_id, tree_old):

        file_cmds = []

        modifies = []

        renamed = []

        # See https://bugs.edge.launchpad.net/bzr-fastimport/+bug/268933.

        # In a nutshell, there are several nasty cases:

        #

        # 1) bzr rm a; bzr mv b a; bzr commit

        # 2) bzr mv x/y z; bzr rm x; commmit

        #

        # The first must come out with the delete first like this:

        #

        # D a

        # R b a

        #

        # The second case must come out with the rename first like this:

        #

        # R x/y z

        # D x

        #

        # So outputting all deletes first or all renames first won't work.

        # Instead, we need to make multiple passes over the various lists to

        # get the ordering right.

        must_be_renamed = {}

        old_to_new = {}

        deleted_paths = set([p for p, _, _ in deletes])

        for (oldpath, newpath, id_, kind,

                text_modified, meta_modified) in renames:

            emit = kind != 'directory' or not self.plain_format

            if newpath in deleted_paths:

                if emit:

                    file_cmds.append(commands.FileDeleteCommand(newpath))

                deleted_paths.remove(newpath)

            if (self.is_empty_dir(tree_old, oldpath)):

                self.note("Skipping empty dir %s in rev %s" % (oldpath,

                    revision_id))

                continue

            #oldpath = self._adjust_path_for_renames(oldpath, renamed,

            #    revision_id)

            renamed.append([oldpath, newpath])

            old_to_new[oldpath] = newpath

            if emit:

                file_cmds.append(commands.FileRenameCommand(oldpath, newpath))

            if text_modified or meta_modified:

                modifies.append((newpath, id_, kind))

            # Renaming a directory implies all children must be renamed.

            # Note: changes_from() doesn't handle this

            if kind == 'directory':

                for p, e in tree_old.inventory.iter_entries_by_dir(from_dir=id_):

                    if e.kind == 'directory' and self.plain_format:

                        continue

                    old_child_path = osutils.pathjoin(oldpath, p)

                    new_child_path = osutils.pathjoin(newpath, p)

                    must_be_renamed[old_child_path] = new_child_path

        # Add children not already renamed

        if must_be_renamed:

            renamed_already = set(old_to_new.keys())

            still_to_be_renamed = set(must_be_renamed.keys()) - renamed_already

            for old_child_path in sorted(still_to_be_renamed):

                new_child_path = must_be_renamed[old_child_path]

                if self.verbose:

                    self.note("implicitly renaming %s => %s" % (old_child_path,

                        new_child_path))

                file_cmds.append(commands.FileRenameCommand(old_child_path,

                    new_child_path))

        # Record remaining deletes

        for path, id_, kind in deletes:

            if path not in deleted_paths:

                continue

            if kind == 'directory' and self.plain_format:

                continue

            #path = self._adjust_path_for_renames(path, renamed, revision_id)

            file_cmds.append(commands.FileDeleteCommand(path))

        return file_cmds, modifies, renamed

    def _adjust_path_for_renames(self, path, renamed, revision_id):

        # If a previous rename is found, we should adjust the path

        for old, new in renamed:

            if path == old:

                self.note("Changing path %s given rename to %s in revision %s"

                    % (path, new, revision_id))

                path = new

            elif path.startswith(old + '/'):

                self.note(

                    "Adjusting path %s given rename of %s to %s in revision %s"

                    % (path, old, new, revision_id))

                path = path.replace(old + "/", new + "/")

        return path

    def emit_tags(self):

        for tag, revid in self.branch.tags.get_tag_dict().items():

            try:

                mark = self.revid_to_mark[revid]

            except KeyError:

                self.warning('not creating tag %r pointing to non-existent '

                    'revision %s' % (tag, revid))

            else:

                git_ref = 'refs/tags/%s' % tag

                self.print_cmd(commands.ResetCommand(git_ref, ":" + str(mark)))

    def _next_tmp_branch_name(self):

        """Return a unique branch name. The name will start with "tmp"."""

        prefix = 'tmp'

        if prefix not in self.branch_names:

            self.branch_names[prefix] = 0

        else:

            self.branch_names[prefix] += 1

            prefix = '%s.%d' % (prefix, self.branch_names[prefix])

        return prefix