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Viewing changes to breezy/fetch_ghosts.py

  • Committer: John Ferlito
  • Date: 2009-09-02 04:31:45 UTC
  • mto: (4665.7.1 serve-init)
  • mto: This revision was merged to the branch mainline in revision 4913.
  • Revision ID: johnf@inodes.org-20090902043145-gxdsfw03ilcwbyn5
Add a debian init script for bzr --serve

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breezy/fetch_ghosts.py
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# Copyright (C) 2005 by Aaron Bentley
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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import contextlib
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from .branch import Branch
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from .trace import note
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from .errors import NoSuchRevision, CommandError
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class GhostFetcher(object):
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    @classmethod
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    def from_cmdline(cls, other):
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        this_branch = Branch.open_containing('.')[0]
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        if other is None:
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            other = this_branch.get_parent()
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            if other is None:
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                raise CommandError('No branch specified and no location'
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                                      ' saved.')
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            else:
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                note("Using saved location %s.", other)
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        other_branch = Branch.open_containing(other)[0]
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        return cls(this_branch, other_branch)
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    def __init__(self, this_branch, other_branch):
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        self.this_branch = this_branch
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        self.other_branch = other_branch
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    def run(self):
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        lock_other = self.this_branch.base != self.other_branch.base
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        with contextlib.ExitStack() as exit_stack:
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            exit_stack.enter_context(self.this_branch.lock_write())
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            if lock_other:
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                exit_stack.enter_context(self.other_branch.lock_read())
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            return self._run_locked()
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    def iter_ghosts(self):
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        """Find all ancestors that aren't stored in this branch."""
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        seen = set()
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        lines = [self.this_branch.last_revision()]
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        if lines[0] is None:
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            return
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        while len(lines) > 0:
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            new_lines = []
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            for line in lines:
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                if line in seen:
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                    continue
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                seen.add(line)
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                try:
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                    revision = self.this_branch.repository.get_revision(line)
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                    new_lines.extend(revision.parent_ids)
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                except NoSuchRevision:
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                    yield line
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            lines = new_lines
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    def _run_locked(self):
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        installed = []
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        failed = []
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        if self.this_branch.last_revision() is None:
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            print("No revisions in branch.")
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            return
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        # Because iter_ghosts tests for existence after our last fetch
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        # is complete, it won't falsely report an ancestor as a ghost.
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        # Yay iterators!
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        ghosts = self.iter_ghosts()
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        for revision in ghosts:
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            try:
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                self.this_branch.fetch(self.other_branch, revision)
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                installed.append(revision)
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            except NoSuchRevision:
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                failed.append(revision)
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        return installed, failed