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# Copyright (C) 2011 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
"""Tests for the branch open with specific URL policy code."""
from bzrlib import urlutils
from bzrlib.branch import (
Branch,
BranchReferenceFormat,
)
from bzrlib.bzrdir import (
BzrDir,
BzrProber,
)
from bzrlib.controldir import ControlDirFormat
from bzrlib.errors import NotBranchError
from bzrlib.url_policy_open import (
BadUrl,
_BlacklistPolicy,
BranchLoopError,
BranchReferenceForbidden,
open_only_scheme,
BranchOpener,
WhitelistPolicy,
)
from bzrlib.tests import (
TestCase,
TestCaseWithTransport,
)
from bzrlib.transport import chroot
class TestBranchOpenerCheckAndFollowBranchReference(TestCase):
"""Unit tests for `BranchOpener.check_and_follow_branch_reference`."""
def setUp(self):
super(TestBranchOpenerCheckAndFollowBranchReference, self).setUp()
BranchOpener.install_hook()
class StubbedBranchOpener(BranchOpener):
"""BranchOpener that provides canned answers.
We implement the methods we need to to be able to control all the
inputs to the `follow_reference` method, which is what is
being tested in this class.
"""
def __init__(self, references, policy):
parent_cls = TestBranchOpenerCheckAndFollowBranchReference
super(parent_cls.StubbedBranchOpener, self).__init__(policy)
self._reference_values = {}
for i in range(len(references) - 1):
self._reference_values[references[i]] = references[i + 1]
self.follow_reference_calls = []
def follow_reference(self, url):
self.follow_reference_calls.append(url)
return self._reference_values[url]
def make_branch_opener(self, should_follow_references, references,
unsafe_urls=None):
policy = _BlacklistPolicy(should_follow_references, unsafe_urls)
opener = self.StubbedBranchOpener(references, policy)
return opener
def test_check_initial_url(self):
# check_and_follow_branch_reference rejects all URLs that are not
# allowed.
opener = self.make_branch_opener(None, [], set(['a']))
self.assertRaises(
BadUrl, opener.check_and_follow_branch_reference, 'a')
def test_not_reference(self):
# When branch references are forbidden, check_and_follow_branch_reference
# does not raise on non-references.
opener = self.make_branch_opener(False, ['a', None])
self.assertEquals(
'a', opener.check_and_follow_branch_reference('a'))
self.assertEquals(['a'], opener.follow_reference_calls)
def test_branch_reference_forbidden(self):
# check_and_follow_branch_reference raises BranchReferenceForbidden if
# branch references are forbidden and the source URL points to a
# branch reference.
opener = self.make_branch_opener(False, ['a', 'b'])
self.assertRaises(
BranchReferenceForbidden,
opener.check_and_follow_branch_reference, 'a')
self.assertEquals(['a'], opener.follow_reference_calls)
def test_allowed_reference(self):
# check_and_follow_branch_reference does not raise if following references
# is allowed and the source URL points to a branch reference to a
# permitted location.
opener = self.make_branch_opener(True, ['a', 'b', None])
self.assertEquals(
'b', opener.check_and_follow_branch_reference('a'))
self.assertEquals(['a', 'b'], opener.follow_reference_calls)
def test_check_referenced_urls(self):
# check_and_follow_branch_reference checks if the URL a reference points
# to is safe.
opener = self.make_branch_opener(
True, ['a', 'b', None], unsafe_urls=set('b'))
self.assertRaises(
BadUrl, opener.check_and_follow_branch_reference, 'a')
self.assertEquals(['a'], opener.follow_reference_calls)
def test_self_referencing_branch(self):
# check_and_follow_branch_reference raises BranchReferenceLoopError if
# following references is allowed and the source url points to a
# self-referencing branch reference.
opener = self.make_branch_opener(True, ['a', 'a'])
self.assertRaises(
BranchLoopError, opener.check_and_follow_branch_reference, 'a')
self.assertEquals(['a'], opener.follow_reference_calls)
def test_branch_reference_loop(self):
# check_and_follow_branch_reference raises BranchReferenceLoopError if
# following references is allowed and the source url points to a loop
# of branch references.
references = ['a', 'b', 'a']
opener = self.make_branch_opener(True, references)
self.assertRaises(
BranchLoopError, opener.check_and_follow_branch_reference, 'a')
self.assertEquals(['a', 'b'], opener.follow_reference_calls)
class TrackingProber(BzrProber):
"""Subclass of BzrProber which tracks URLs it has been asked to open."""
seen_urls = []
@classmethod
def probe_transport(klass, transport):
klass.seen_urls.append(transport.base)
return BzrProber.probe_transport(transport)
class TestBranchOpenerStacking(TestCaseWithTransport):
def setUp(self):
super(TestBranchOpenerStacking, self).setUp()
BranchOpener.install_hook()
def make_branch_opener(self, allowed_urls, probers=None):
policy = WhitelistPolicy(True, allowed_urls, True)
return BranchOpener(policy, probers)
def test_probers(self):
# Only the specified probers should be used
b = self.make_branch('branch')
opener = self.make_branch_opener([b.base], probers=[])
self.assertRaises(NotBranchError, opener.open, b.base)
opener = self.make_branch_opener([b.base], probers=[BzrProber])
self.assertEquals(b.base, opener.open(b.base).base)
def test_default_probers(self):
# If no probers are specified to the constructor
# of BranchOpener, then a safe set will be used,
# rather than all probers registered in bzr.
self.addCleanup(ControlDirFormat.unregister_prober, TrackingProber)
ControlDirFormat.register_prober(TrackingProber)
# Open a location without any branches, so that all probers are
# tried.
# First, check that the TrackingProber tracks correctly.
TrackingProber.seen_urls = []
opener = self.make_branch_opener(["."], probers=[TrackingProber])
self.assertRaises(NotBranchError, opener.open, ".")
self.assertEquals(1, len(TrackingProber.seen_urls))
TrackingProber.seen_urls = []
# And make sure it's registered in such a way that BzrDir.open would
# use it.
self.assertRaises(NotBranchError, BzrDir.open, ".")
self.assertEquals(1, len(TrackingProber.seen_urls))
def test_allowed_url(self):
# the opener does not raise an exception for branches stacked on
# branches with allowed URLs.
stacked_on_branch = self.make_branch('base-branch', format='1.6')
stacked_branch = self.make_branch('stacked-branch', format='1.6')
stacked_branch.set_stacked_on_url(stacked_on_branch.base)
opener = self.make_branch_opener(
[stacked_branch.base, stacked_on_branch.base])
# This doesn't raise an exception.
opener.open(stacked_branch.base)
def test_nstackable_repository(self):
# treats branches with UnstackableRepositoryFormats as
# being not stacked.
branch = self.make_branch('unstacked', format='knit')
opener = self.make_branch_opener([branch.base])
# This doesn't raise an exception.
opener.open(branch.base)
def test_allowed_relative_url(self):
# passes on absolute urls to check_one_url, even if the
# value of stacked_on_location in the config is set to a relative URL.
stacked_on_branch = self.make_branch('base-branch', format='1.6')
stacked_branch = self.make_branch('stacked-branch', format='1.6')
stacked_branch.set_stacked_on_url('../base-branch')
opener = self.make_branch_opener(
[stacked_branch.base, stacked_on_branch.base])
# Note that stacked_on_branch.base is not '../base-branch', it's an
# absolute URL.
self.assertNotEqual('../base-branch', stacked_on_branch.base)
# This doesn't raise an exception.
opener.open(stacked_branch.base)
def test_allowed_relative_nested(self):
# Relative URLs are resolved relative to the stacked branch.
self.get_transport().mkdir('subdir')
a = self.make_branch('subdir/a', format='1.6')
b = self.make_branch('b', format='1.6')
b.set_stacked_on_url('../subdir/a')
c = self.make_branch('subdir/c', format='1.6')
c.set_stacked_on_url('../../b')
opener = self.make_branch_opener([c.base, b.base, a.base])
# This doesn't raise an exception.
opener.open(c.base)
def test_forbidden_url(self):
# raises a BadUrl exception if a branch is stacked on a
# branch with a forbidden URL.
stacked_on_branch = self.make_branch('base-branch', format='1.6')
stacked_branch = self.make_branch('stacked-branch', format='1.6')
stacked_branch.set_stacked_on_url(stacked_on_branch.base)
opener = self.make_branch_opener([stacked_branch.base])
self.assertRaises(BadUrl, opener.open, stacked_branch.base)
def test_forbidden_url_nested(self):
# raises a BadUrl exception if a branch is stacked on a
# branch that is in turn stacked on a branch with a forbidden URL.
a = self.make_branch('a', format='1.6')
b = self.make_branch('b', format='1.6')
b.set_stacked_on_url(a.base)
c = self.make_branch('c', format='1.6')
c.set_stacked_on_url(b.base)
opener = self.make_branch_opener([c.base, b.base])
self.assertRaises(BadUrl, opener.open, c.base)
def test_self_stacked_branch(self):
# raises StackingLoopError if a branch is stacked on
# itself. This avoids infinite recursion errors.
a = self.make_branch('a', format='1.6')
# Bazaar 1.17 and up make it harder to create branches like this.
# It's still worth testing that we don't blow up in the face of them,
# so we grovel around a bit to create one anyway.
a.get_config().set_user_option('stacked_on_location', a.base)
opener = self.make_branch_opener([a.base])
self.assertRaises(BranchLoopError, opener.open, a.base)
def test_loop_stacked_branch(self):
# raises StackingLoopError if a branch is stacked in such
# a way so that it is ultimately stacked on itself. e.g. a stacked on
# b stacked on a.
a = self.make_branch('a', format='1.6')
b = self.make_branch('b', format='1.6')
a.set_stacked_on_url(b.base)
b.set_stacked_on_url(a.base)
opener = self.make_branch_opener([a.base, b.base])
self.assertRaises(BranchLoopError, opener.open, a.base)
self.assertRaises(BranchLoopError, opener.open, b.base)
def test_custom_opener(self):
# A custom function for opening a control dir can be specified.
a = self.make_branch('a', format='2a')
b = self.make_branch('b', format='2a')
b.set_stacked_on_url(a.base)
TrackingProber.seen_urls = []
opener = self.make_branch_opener(
[a.base, b.base], probers=[TrackingProber])
opener.open(b.base)
self.assertEquals(
set(TrackingProber.seen_urls), set([b.base, a.base]))
def test_custom_opener_with_branch_reference(self):
# A custom function for opening a control dir can be specified.
a = self.make_branch('a', format='2a')
b_dir = self.make_bzrdir('b')
b = BranchReferenceFormat().initialize(b_dir, target_branch=a)
TrackingProber.seen_urls = []
opener = self.make_branch_opener(
[a.base, b.base], probers=[TrackingProber])
opener.open(b.base)
self.assertEquals(
set(TrackingProber.seen_urls), set([b.base, a.base]))
class TestOpenOnlyScheme(TestCaseWithTransport):
"""Tests for `open_only_scheme`."""
def setUp(self):
super(TestOpenOnlyScheme, self).setUp()
BranchOpener.install_hook()
def test_hook_does_not_interfere(self):
# The transform_fallback_location hook does not interfere with regular
# stacked branch access outside of open_only_scheme.
self.make_branch('stacked')
self.make_branch('stacked-on')
Branch.open('stacked').set_stacked_on_url('../stacked-on')
Branch.open('stacked')
def get_chrooted_scheme(self, relpath):
"""Create a server that is chrooted to `relpath`.
:return: ``(scheme, get_url)`` where ``scheme`` is the scheme of the
chroot server and ``get_url`` returns URLs on said server.
"""
transport = self.get_transport(relpath)
chroot_server = chroot.ChrootServer(transport)
chroot_server.start_server()
self.addCleanup(chroot_server.stop_server)
def get_url(relpath):
return chroot_server.get_url() + relpath
return urlutils.URL.from_string(chroot_server.get_url()).scheme, get_url
def test_stacked_within_scheme(self):
# A branch that is stacked on a URL of the same scheme is safe to
# open.
self.get_transport().mkdir('inside')
self.make_branch('inside/stacked')
self.make_branch('inside/stacked-on')
scheme, get_chrooted_url = self.get_chrooted_scheme('inside')
Branch.open(get_chrooted_url('stacked')).set_stacked_on_url(
get_chrooted_url('stacked-on'))
open_only_scheme(scheme, get_chrooted_url('stacked'))
def test_stacked_outside_scheme(self):
# A branch that is stacked on a URL that is not of the same scheme is
# not safe to open.
self.get_transport().mkdir('inside')
self.get_transport().mkdir('outside')
self.make_branch('inside/stacked')
self.make_branch('outside/stacked-on')
scheme, get_chrooted_url = self.get_chrooted_scheme('inside')
Branch.open(get_chrooted_url('stacked')).set_stacked_on_url(
self.get_url('outside/stacked-on'))
self.assertRaises(
BadUrl, open_only_scheme, scheme, get_chrooted_url('stacked'))
|