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