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#! /usr/bin/env python
# Copyright (C) 2005 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
"""Proxy object for access to remote branches.
At the moment remote branches are only for HTTP and only for read
access.
"""
import gzip
from sets import Set
from cStringIO import StringIO
from errors import BzrError, BzrCheckError
from branch import Branch
# velocitynet.com.au transparently proxies connections and thereby
# breaks keep-alive -- sucks!
ENABLE_URLGRABBER = False
def get_url(url, compressed=False):
import urllib2
if compressed:
url += '.gz'
url_f = urllib2.urlopen(url)
if compressed:
return gzip.GzipFile(fileobj=StringIO(url_f.read()))
else:
return url_f
if ENABLE_URLGRABBER:
import urlgrabber
import urlgrabber.keepalive
urlgrabber.keepalive.DEBUG = 0
def get_url(path, compressed=False):
try:
url = path
if compressed:
url += '.gz'
url_f = urlgrabber.urlopen(url, keepalive=1, close_connection=0)
if not compressed:
return url_f
else:
return gzip.GzipFile(fileobj=StringIO(url_f.read()))
except urllib2.URLError, e:
raise BzrError("remote fetch failed: %r: %s" % (url, e))
def _find_remote_root(url):
"""Return the prefix URL that corresponds to the branch root."""
orig_url = url
while True:
try:
ff = get_url(url + '/.bzr/branch-format')
ff.close()
return url
except urllib.URLError:
pass
try:
idx = url.rindex('/')
except ValueError:
raise BzrError('no branch root found for URL %s' % orig_url)
url = url[:idx]
class RemoteBranch(Branch):
def __init__(self, baseurl, find_root=False, lock_mode='r'):
"""Create new proxy for a remote branch."""
if lock_mode not in ('', 'r'):
raise BzrError('lock mode %r is not supported for remote branches'
% lock_mode)
self.baseurl = baseurl
self._check_format()
def controlfile(self, filename, mode):
if mode not in ('rb', 'rt', 'r'):
raise BzrError("file mode %r not supported for remote branches" % mode)
return get_url(self.baseurl + '/.bzr/' + filename, False)
def _need_readlock(self):
# remote branch always safe for read
pass
def _need_writelock(self):
raise BzrError("cannot get write lock on HTTP remote branch")
def relpath(self, path):
if not path.startswith(self.baseurl):
raise BzrError('path %r is not under base URL %r'
% (path, self.baseurl))
pl = len(self.baseurl)
return path[pl:].lstrip('/')
def get_revision(self, revision_id):
from revision import Revision
revf = get_url(self.baseurl + '/.bzr/revision-store/' + revision_id,
True)
r = Revision.read_xml(revf)
if r.revision_id != revision_id:
raise BzrCheckError('revision stored as {%s} actually contains {%s}'
% (revision_id, r.revision_id))
return r
def simple_walk():
from revision import Revision
from branch import Branch
from inventory import Inventory
got_invs = Set()
got_texts = Set()
print 'read history'
history = get_url('/.bzr/revision-history').readlines()
num_revs = len(history)
for i, rev_id in enumerate(history):
rev_id = rev_id.rstrip()
print 'read revision %d/%d' % (i, num_revs)
# python gzip needs a seekable file (!!) but the HTTP response
# isn't, so we need to buffer it
rev_f = get_url('/.bzr/revision-store/%s' % rev_id,
compressed=True)
rev = Revision.read_xml(rev_f)
print rev.message
inv_id = rev.inventory_id
if inv_id not in got_invs:
print 'get inventory %s' % inv_id
inv_f = get_url('/.bzr/inventory-store/%s' % inv_id,
compressed=True)
inv = Inventory.read_xml(inv_f)
print '%4d inventory entries' % len(inv)
for path, ie in inv.iter_entries():
text_id = ie.text_id
if text_id == None:
continue
if text_id in got_texts:
continue
print ' fetch %s text {%s}' % (path, text_id)
text_f = get_url('/.bzr/text-store/%s' % text_id,
compressed=True)
got_texts.add(text_id)
got_invs.add(inv_id)
print '----'
def try_me():
BASE_URL = 'http://bazaar-ng.org/bzr/bzr.dev/'
b = RemoteBranch(BASE_URL)
## print '\n'.join(b.revision_history())
from log import show_log
show_log(b)
if __name__ == '__main__':
try_me()
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