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# (C) 2005 Canonical
# 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
import bzrlib.errors
class RevisionReference(object):
"""
Reference to a stored revision.
Includes the revision_id and revision_sha1.
"""
revision_id = None
revision_sha1 = None
def __init__(self, revision_id, revision_sha1=None):
if revision_id == None \
or isinstance(revision_id, basestring):
self.revision_id = revision_id
else:
raise ValueError('bad revision_id %r' % revision_id)
if revision_sha1 != None:
if isinstance(revision_sha1, basestring) \
and len(revision_sha1) == 40:
self.revision_sha1 = revision_sha1
else:
raise ValueError('bad revision_sha1 %r' % revision_sha1)
class Revision(object):
"""Single revision on a branch.
Revisions may know their revision_hash, but only once they've been
written out. This is not stored because you cannot write the hash
into the file it describes.
After bzr 0.0.5 revisions are allowed to have multiple parents.
parents
List of parent revisions, each is a RevisionReference.
"""
inventory_id = None
inventory_sha1 = None
revision_id = None
timestamp = None
message = None
timezone = None
committer = None
def __init__(self, **args):
self.__dict__.update(args)
self.parents = []
def __repr__(self):
return "<Revision id %s>" % self.revision_id
def to_element(self):
from bzrlib.xml import Element, SubElement
root = Element('revision',
committer = self.committer,
timestamp = '%.9f' % self.timestamp,
revision_id = self.revision_id,
inventory_id = self.inventory_id,
inventory_sha1 = self.inventory_sha1,
)
if self.timezone:
root.set('timezone', str(self.timezone))
root.text = '\n'
msg = SubElement(root, 'message')
msg.text = self.message
msg.tail = '\n'
if self.parents:
pelts = SubElement(root, 'parents')
pelts.tail = pelts.text = '\n'
for rr in self.parents:
assert isinstance(rr, RevisionReference)
p = SubElement(pelts, 'revision_ref')
p.tail = '\n'
assert rr.revision_id
p.set('revision_id', rr.revision_id)
if rr.revision_sha1:
p.set('revision_sha1', rr.revision_sha1)
return root
def from_element(cls, elt):
return unpack_revision(elt)
from_element = classmethod(from_element)
def unpack_revision(elt):
"""Convert XML element into Revision object."""
# <changeset> is deprecated...
if elt.tag not in ('revision', 'changeset'):
raise bzrlib.errors.BzrError("unexpected tag in revision file: %r" % elt)
rev = Revision(committer = elt.get('committer'),
timestamp = float(elt.get('timestamp')),
revision_id = elt.get('revision_id'),
inventory_id = elt.get('inventory_id'),
inventory_sha1 = elt.get('inventory_sha1')
)
precursor = elt.get('precursor')
precursor_sha1 = elt.get('precursor_sha1')
pelts = elt.find('parents')
if pelts:
for p in pelts:
assert p.tag == 'revision_ref', \
"bad parent node tag %r" % p.tag
rev_ref = RevisionReference(p.get('revision_id'),
p.get('revision_sha1'))
rev.parents.append(rev_ref)
if precursor:
# must be consistent
prec_parent = rev.parents[0].revision_id
assert prec_parent == precursor
elif precursor:
# revisions written prior to 0.0.5 have a single precursor
# give as an attribute
rev_ref = RevisionReference(precursor, precursor_sha1)
rev.parents.append(rev_ref)
v = elt.get('timezone')
rev.timezone = v and int(v)
rev.message = elt.findtext('message') # text of <message>
return rev
REVISION_ID_RE = None
def validate_revision_id(rid):
"""Check rid is syntactically valid for a revision id."""
global REVISION_ID_RE
if not REVISION_ID_RE:
import re
REVISION_ID_RE = re.compile('[\w.-]+@[\w.-]+--?\d+--?[0-9a-f]+\Z')
if not REVISION_ID_RE.match(rid):
raise ValueError("malformed revision-id %r" % rid)
def is_ancestor(revision_id, candidate_id, revision_source):
"""Return true if candidate_id is an ancestor of revision_id.
A false negative will be returned if any intermediate descendent of
candidate_id is not present in any of the revision_sources.
revisions_source is an object supporting a get_revision operation that
behaves like Branch's.
"""
ancestors = (revision_id,)
while len(ancestors) > 0:
new_ancestors = []
for ancestor in ancestors:
if ancestor == candidate_id:
return True
try:
revision = revision_source.get_revision(ancestor)
except bzrlib.errors.NoSuchRevision, e:
if e.revision == revision_id:
raise
else:
continue
new_ancestors.extend([p.revision_id for p in revision.parents])
ancestors = new_ancestors
class MultipleRevisionSources(object):
def __init__(self, *args):
object.__init__(self)
assert len(args) != 0
self._revision_sources = args
def get_revision(self, revision_id):
for source in self._revision_sources:
try:
return source.get_revision(revision_id)
except bzrlib.errors.NoSuchRevision, e:
pass
raise e
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