/brz/remove-bazaar

# Copyright (C) 2010-2018 Jelmer Vernooij <jelmer@jelmer.uk>

#

# 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

"""Conversion between refs and Bazaar revision pointers."""

from __future__ import absolute_import

from dulwich.refs import (

    ANNOTATED_TAG_SUFFIX,

    LOCAL_BRANCH_PREFIX,

    LOCAL_TAG_PREFIX,

    )

from dulwich.repo import (

    RefsContainer,

    )

from .. import (

    errors,

    osutils,

    revision as _mod_revision,

    )

is_tag = lambda x: x.startswith(LOCAL_TAG_PREFIX)

is_head = lambda x: x.startswith(LOCAL_BRANCH_PREFIX)

is_peeled = lambda x: x.endswith(ANNOTATED_TAG_SUFFIX)

def gather_peeled(refs):

    ret = {}

    for k, v in refs.items():

        if is_peeled(k):

            continue

        try:

            peeled = refs[k+ANNOTATED_TAG_SUFFIX]

            unpeeled = v

        except KeyError:

            peeled = v

            unpeeled = None

        ret[k] = (peeled, unpeeled)

    return ret

def branch_name_to_ref(name):

    """Map a branch name to a ref.

    :param name: Branch name

    :return: ref string

    """

    if name == "":

        return b"HEAD"

    if not name.startswith("refs/"):

        return LOCAL_BRANCH_PREFIX + osutils.safe_utf8(name)

    else:

        return osutils.safe_utf8(name)

def tag_name_to_ref(name):

    """Map a tag name to a ref.

    :param name: Tag name

    :return: ref string

    """

    return LOCAL_TAG_PREFIX + osutils.safe_utf8(name)

def ref_to_branch_name(ref):

    """Map a ref to a branch name

    :param ref: Ref

    :return: A branch name

    """

    if ref == b"HEAD":

        return u""

    if ref is None:

        return ref

    if ref.startswith(LOCAL_BRANCH_PREFIX):

        return ref[len(LOCAL_BRANCH_PREFIX):].decode('utf-8')

    raise ValueError("unable to map ref %s back to branch name" % ref)

def ref_to_tag_name(ref):

    if ref.startswith(LOCAL_TAG_PREFIX):

        return ref[len(LOCAL_TAG_PREFIX):].decode("utf-8")

    raise ValueError("unable to map ref %s back to tag name" % ref)

class BazaarRefsContainer(RefsContainer):

    def __init__(self, dir, object_store):

        self.dir = dir

        self.object_store = object_store

    def get_packed_refs(self):

        return {}

    def set_symbolic_ref(self, name, other):

        if name == b"HEAD":

            pass # FIXME: Switch default branch

        else:

            raise NotImplementedError(

                "Symbolic references not supported for anything other than "

                "HEAD")

    def _get_revid_by_tag_name(self, tag_name):

        for branch in self.dir.list_branches():

            try:

                # FIXME: This is ambiguous!

                return branch.tags.lookup_tag(tag_name)

            except errors.NoSuchTag:

                pass

        return None

    def _get_revid_by_branch_name(self, branch_name):

        try:

            branch = self.dir.open_branch(branch_name)

        except errors.NoColocatedBranchSupport:

            if branch_name in ("HEAD", "master"):

                branch = self.dir.open_branch()

            else:

                raise

        return branch.last_revision()

    def read_loose_ref(self, ref):

        try:

            branch_name = ref_to_branch_name(ref)

        except ValueError:

            tag_name = ref_to_tag_name(ref)

            revid = self._get_revid_by_tag_name(tag_name)

        else:

            revid = self._get_revid_by_branch_name(branch_name)

        if revid == _mod_revision.NULL_REVISION:

            return None

        # FIXME: Unpeel if necessary

        with self.object_store.lock_read():

            return self.object_store._lookup_revision_sha1(revid)

    def get_peeled(self, ref):

        return self.read_loose_ref(ref)

    def allkeys(self):

        keys = set()

        for branch in self.dir.list_branches():

            repo = branch.repository

            if repo.has_revision(branch.last_revision()):

                ref = branch_name_to_ref(getattr(branch, "name", ""))

                keys.add(ref)

            try:

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

                    if repo.has_revision(revid):

                        keys.add(tag_name_to_ref(tag_name))

            except errors.TagsNotSupported:

                pass

        return keys

    def __delitem__(self, ref):

        try:

            branch_name = ref_to_branch_name(ref)

        except ValueError:

            return # FIXME: Cope with tags!

        self.dir.destroy_branch(branch_name)

    def __setitem__(self, ref, sha):

        try:

            branch_name = ref_to_branch_name(ref)

        except ValueError:

            # FIXME: Cope with tags!

            return

        try:

            target_branch = self.repo_dir.open_branch(branch_name)

        except errors.NotBranchError:

            target_branch = self.repo.create_branch(branch_name)

        rev_id = self.mapping.revision_id_foreign_to_bzr(sha)

        with target_branch.lock_write():

            target_branch.generate_revision_history(rev_id)

def get_refs_container(controldir, object_store):

    fn = getattr(controldir, "get_refs_container", None)

    if fn is not None:

        return fn()

    return BazaarRefsContainer(controldir, object_store)

def remote_refs_dict_to_tag_refs(refs_dict):

    base = {}

    peeled = {}

    for k, v in refs_dict.items():

        if is_peeled(k):

            peeled[k[:-3]] = v

        else:

            base[k] = v

            peeled[k] = v

    all_keys = set().union(base.keys(), peeled.keys())

    for n in all_keys:

        try:

            tag_name = ref_to_tag_name(n)

        except ValueError:

            continue

        yield (n, tag_name, peeled.get(n), base.get(n))