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refs.py
 
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# Copyright (C) 2010 Jelmer Vernooij <jelmer@samba.org>
 
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#
 
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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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
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"""Conversion between refs and Bazaar revision pointers."""
 
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from __future__ import absolute_import
 
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from dulwich.repo import (
 
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    RefsContainer,
 
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    )
 
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from ... import (
 
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    errors,
 
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    osutils,
 
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    )
 
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is_tag = lambda x: x.startswith("refs/tags/")
 
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is_head = lambda x: x.startswith("refs/heads/")
 
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is_peeled = lambda x: x.endswith("^{}")
 
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def gather_peeled(refs):
 
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    ret = {}
 
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    for k, v in refs.iteritems():
 
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        if is_peeled(k):
 
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            continue
 
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        try:
 
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            peeled = refs[k+"^{}"]
 
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            unpeeled = v
 
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        except KeyError:
 
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            peeled = v
 
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            unpeeled = None
 
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        ret[k] = (peeled, unpeeled)
 
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    return ret
 
48
 
 
49
 
 
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def branch_name_to_ref(name):
 
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    """Map a branch name to a ref.
 
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    :param name: Branch name
 
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    :return: ref string
 
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    """
 
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    if name == "":
 
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        return "HEAD"
 
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    if not name.startswith("refs/"):
 
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        return "refs/heads/%s" % osutils.safe_utf8(name)
 
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    else:
 
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        return osutils.safe_utf8(name)
 
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def tag_name_to_ref(name):
 
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    """Map a tag name to a ref.
 
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    :param name: Tag name
 
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    :return: ref string
 
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    """
 
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    return "refs/tags/%s" % osutils.safe_utf8(name)
 
71
 
 
72
 
 
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def ref_to_branch_name(ref):
 
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    """Map a ref to a branch name
 
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    :param ref: Ref
 
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    :return: A branch name
 
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    """
 
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    if ref == "HEAD":
 
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        return u""
 
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    if ref is None:
 
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        return ref
 
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    if ref.startswith("refs/heads/"):
 
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        return osutils.safe_unicode(ref[len("refs/heads/"):])
 
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    raise ValueError("unable to map ref %s back to branch name" % ref)
 
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87
 
 
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def ref_to_tag_name(ref):
 
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    if ref.startswith("refs/tags/"):
 
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        return ref[len('refs/tags/'):].decode("utf-8")
 
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    raise ValueError("unable to map ref %s back to tag name" % ref)
 
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93
 
 
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class BazaarRefsContainer(RefsContainer):
 
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    def __init__(self, dir, object_store):
 
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        self.dir = dir
 
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        self.object_store = object_store
 
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    def set_symbolic_ref(self, name, other):
 
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        if name == "HEAD":
 
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            pass # FIXME: Switch default branch
 
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        else:
 
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            raise NotImplementedError(
 
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                "Symbolic references not supported for anything other than "
 
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                "HEAD")
 
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    def _get_revid_by_tag_name(self, tag_name):
 
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        for branch in self.dir.list_branches():
 
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            try:
 
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                # FIXME: This is ambiguous!
 
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                return branch.tags.lookup_tag(tag_name)
 
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            except errors.NoSuchTag:
 
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                pass
 
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        return None
 
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    def _get_revid_by_branch_name(self, branch_name):
 
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        try:
 
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            branch = self.dir.open_branch(branch_name)
 
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        except errors.NoColocatedBranchSupport:
 
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            if branch_name in ("HEAD", "master"):
 
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                branch = self.dir.open_branch()
 
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            else:
 
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                raise
 
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        return branch.last_revision()
 
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127
    def read_loose_ref(self, ref):
 
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        try:
 
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            branch_name = ref_to_branch_name(ref)
 
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        except ValueError:
 
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            tag_name = ref_to_tag_name(ref)
 
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            revid = self._get_revid_by_tag_name(tag_name)
 
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        else:
 
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            revid = self._get_revid_by_branch_name(branch_name)
 
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        # FIXME: Unpeel if necessary
 
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        return self.object_store._lookup_revision_sha1(revid)
 
137
 
 
138
    def get_peeled(self, ref):
 
139
        return self.read_loose_ref(ref)
 
140
 
 
141
    def allkeys(self):
 
142
        keys = set()
 
143
        for branch in self.dir.list_branches():
 
144
            repo = branch.repository
 
145
            if repo.has_revision(branch.last_revision()):
 
146
                ref = branch_name_to_ref(getattr(branch, "name", ""))
 
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                keys.add(ref)
 
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            try:
 
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                for tag_name, revid in branch.tags.get_tag_dict().iteritems():
 
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                    if repo.has_revision(revid):
 
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                        keys.add(tag_name_to_ref(tag_name))
 
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            except errors.TagsNotSupported:
 
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                pass
 
154
        return keys
 
155
 
 
156
    def __delitem__(self, ref):
 
157
        try:
 
158
            branch_name = ref_to_branch_name(ref)
 
159
        except ValueError:
 
160
            return # FIXME: Cope with tags!
 
161
        self.dir.destroy_branch(branch_name)
 
162
 
 
163
    def __setitem__(self, ref, sha):
 
164
        try:
 
165
            branch_name = ref_to_branch_name(ref)
 
166
        except ValueError:
 
167
            # FIXME: Cope with tags!
 
168
            return
 
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        try:
 
170
            target_branch = self.repo_dir.open_branch(branch_name)
 
171
        except errors.NotBranchError:
 
172
            target_branch = self.repo.create_branch(branch_name)
 
173
 
 
174
        rev_id = self.mapping.revision_id_foreign_to_bzr(sha)
 
175
        target_branch.lock_write()
 
176
        try:
 
177
            target_branch.generate_revision_history(rev_id)
 
178
        finally:
 
179
            target_branch.unlock()
 
180
 
 
181
 
 
182
def get_refs_container(controldir, object_store):
 
183
    fn = getattr(controldir, "get_refs_container", None)
 
184
    if fn is not None:
 
185
        return fn()
 
186
    return BazaarRefsContainer(controldir, object_store)