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Filename : branch.py
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# Copyright (C) 2010 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

"""Weave-era branch implementations."""

from ... import controldir as _mod_controldir
from ... import errors, lockable_files
from ...branch import BindingUnsupported, BranchFormat, BranchWriteLockResult
from ...bzr.fullhistory import FullHistoryBzrBranch
from ...decorators import only_raises
from ...lock import LogicalLockResult
from ...trace import mutter


class BzrBranch4(FullHistoryBzrBranch):
    """Branch format 4."""

    def lock_write(self, token=None):
        """Lock the branch for write operations.

        :param token: A token to permit reacquiring a previously held and
            preserved lock.
        :return: A BranchWriteLockResult.
        """
        if not self.is_locked():
            self._note_lock("w")
        # All-in-one needs to always unlock/lock.
        self.repository._warn_if_deprecated(self)
        self.repository.lock_write()
        try:
            return BranchWriteLockResult(
                self.unlock, self.control_files.lock_write(token=token)
            )
        except:
            self.repository.unlock()
            raise

    def lock_read(self):
        """Lock the branch for read operations.

        :return: A breezy.lock.LogicalLockResult.
        """
        if not self.is_locked():
            self._note_lock("r")
        # All-in-one needs to always unlock/lock.
        self.repository._warn_if_deprecated(self)
        self.repository.lock_read()
        try:
            self.control_files.lock_read()
            return LogicalLockResult(self.unlock)
        except:
            self.repository.unlock()
            raise

    @only_raises(errors.LockNotHeld, errors.LockBroken)
    def unlock(self):
        if self.control_files._lock_count == 2 and self.conf_store is not None:
            self.conf_store.save_changes()
        try:
            self.control_files.unlock()
        finally:
            # All-in-one needs to always unlock/lock.
            self.repository.unlock()
            if not self.control_files.is_locked():
                # we just released the lock
                self._clear_cached_state()

    def _get_checkout_format(self, lightweight=False):
        """Return the most suitable metadir for a checkout of this branch."""
        from ...bzr.bzrdir import BzrDirMetaFormat1
        from .repository import RepositoryFormat7

        format = BzrDirMetaFormat1()
        if lightweight:
            format.set_branch_format(self._format)
            format.repository_format = self.controldir._format.repository_format
        else:
            format.repository_format = RepositoryFormat7()
        return format

    def unbind(self):
        raise errors.UpgradeRequired(self.user_url)

    def bind(self, other):
        raise BindingUnsupported(self)

    def set_bound_location(self, location):
        raise NotImplementedError(self.set_bound_location)

    def get_bound_location(self):
        return None

    def update(self):
        return None

    def get_master_branch(self, possible_transports=None):
        return None


class BzrBranchFormat4(BranchFormat):
    """Bzr branch format 4.

    This format has:
     - a revision-history file.
     - a branch-lock lock file [ to be shared with the bzrdir ]

    It does not support binding.
    """

    def initialize(
        self, a_controldir, name=None, repository=None, append_revisions_only=None
    ):
        """Create a branch of this format in a_controldir.

        :param a_controldir: The bzrdir to initialize the branch in
        :param name: Name of colocated branch to create, if any
        :param repository: Repository for this branch (unused)
        """
        if append_revisions_only:
            raise errors.UpgradeRequired(a_controldir.user_url)
        if repository is not None:
            raise NotImplementedError(
                "initialize(repository=<not None>) on {!r}".format(self)
            )
        if not [
            isinstance(a_controldir._format, format)
            for format in self._compatible_bzrdirs
        ]:
            raise errors.IncompatibleFormat(self, a_controldir._format)
        utf8_files = [
            ("revision-history", b""),
            ("branch-name", b""),
        ]
        mutter("creating branch %r in %s", self, a_controldir.user_url)
        branch_transport = a_controldir.get_branch_transport(self, name=name)
        control_files = lockable_files.LockableFiles(
            branch_transport, "branch-lock", lockable_files.TransportLock
        )
        control_files.create_lock()
        try:
            control_files.lock_write()
        except errors.LockContention:
            lock_taken = False
        else:
            lock_taken = True
        try:
            for filename, content in utf8_files:
                branch_transport.put_bytes(
                    filename, content, mode=a_controldir._get_file_mode()
                )
        finally:
            if lock_taken:
                control_files.unlock()
        branch = self.open(a_controldir, name, _found=True, found_repository=None)
        self._run_post_branch_init_hooks(a_controldir, name, branch)
        return branch

    def __init__(self):
        super().__init__()
        from .bzrdir import BzrDirFormat4, BzrDirFormat5, BzrDirFormat6

        self._matchingcontroldir = BzrDirFormat6()
        self._compatible_bzrdirs = [BzrDirFormat4, BzrDirFormat5, BzrDirFormat6]

    def network_name(self):
        """The network name for this format is the control dirs disk label."""
        return self._matchingcontroldir.get_format_string()

    def get_format_description(self):
        return "Branch format 4"

    def open(
        self,
        a_controldir,
        name=None,
        _found=False,
        ignore_fallbacks=False,
        found_repository=None,
        possible_transports=None,
    ):
        """See BranchFormat.open()."""
        if name is None:
            name = a_controldir._get_selected_branch()
        if name != "":
            raise _mod_controldir.NoColocatedBranchSupport(self)
        if not _found:
            # we are being called directly and must probe.
            raise NotImplementedError
        if found_repository is None:
            found_repository = a_controldir.open_repository()
        return BzrBranch4(
            _format=self,
            _control_files=a_controldir._control_files,
            a_controldir=a_controldir,
            name=name,
            _repository=found_repository,
            possible_transports=possible_transports,
        )

    def __str__(self):
        return "Bazaar-NG branch format 4"

    def supports_leaving_lock(self):
        return False

    supports_reference_locations = False