13
13
# You should have received a copy of the GNU General Public License
14
14
# along with this program; if not, write to the Free Software
15
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
15
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17
17
"""Testament - a summary of a revision for signing.
19
A testament can be defined as "something that serves as tangible
19
A testament can be defined as "something that serves as tangible
20
20
proof or evidence." In bzr we use them to allow people to certify
21
particular revisions as authentic.
21
particular revisions as authentic.
23
23
The goal is that if two revisions are semantically equal, then they will
24
24
have a byte-for-byte equal testament. We can define different versions of
59
59
* the testament uses unix line-endings (\n)
62
from __future__ import absolute_import
64
62
# XXX: At the moment, clients trust that the graph described in a weave
65
63
# is accurate, but that's not covered by the testament. Perhaps the best
66
# fix is when verifying a revision to make sure that every file mentioned
64
# fix is when verifying a revision to make sure that every file mentioned
67
65
# in the revision has compatible ancestry links.
69
67
# TODO: perhaps write timestamp in a more readable form
72
70
# revisions can be serialized.
74
72
from copy import copy
76
from bzrlib.osutils import (
81
from bzrlib.tree import Tree
73
from cStringIO import StringIO
77
from bzrlib.osutils import contains_whitespace, contains_linebreaks
84
79
class Testament(object):
85
80
"""Reduced summary of a revision.
89
84
- produced from a revision
90
85
- written to a stream
92
87
- compared to a revision
95
long_header = 'bazaar-ng testament version 1\n'
96
short_header = 'bazaar-ng testament short form 1\n'
100
91
def from_revision(cls, repository, revision_id):
101
"""Produce a new testament from a historical revision."""
92
"""Produce a new testament from a historical revision"""
102
93
rev = repository.get_revision(revision_id)
103
tree = repository.revision_tree(revision_id)
104
return cls(rev, tree)
107
def from_revision_tree(cls, tree):
108
"""Produce a new testament from a revision tree."""
109
rev = tree._repository.get_revision(tree.get_revision_id())
110
return cls(rev, tree)
112
def __init__(self, rev, tree):
113
"""Create a new testament for rev using tree."""
114
self.revision_id = rev.revision_id
94
inventory = repository.get_inventory(revision_id)
95
return cls(rev, inventory)
97
def __init__(self, rev, inventory):
98
"""Create a new testament for rev using inventory."""
99
self.revision_id = str(rev.revision_id)
115
100
self.committer = rev.committer
116
101
self.timezone = rev.timezone or 0
117
102
self.timestamp = rev.timestamp
118
103
self.message = rev.message
119
104
self.parent_ids = rev.parent_ids[:]
120
if not isinstance(tree, Tree):
121
raise TypeError("As of bzr 2.4 Testament.__init__() takes a "
122
"Revision and a Tree.")
105
self.inventory = inventory
124
106
self.revprops = copy(rev.properties)
125
if contains_whitespace(self.revision_id):
126
raise ValueError(self.revision_id)
127
if contains_linebreaks(self.committer):
128
raise ValueError(self.committer)
107
assert not contains_whitespace(self.revision_id)
108
assert not contains_linebreaks(self.committer)
130
110
def as_text_lines(self):
131
111
"""Yield text form as a sequence of lines.
143
123
# inventory length contains the root, which is not shown here
145
125
for parent_id in sorted(self.parent_ids):
146
if contains_whitespace(parent_id):
147
raise ValueError(parent_id)
126
assert not contains_whitespace(parent_id)
148
127
a(' %s\n' % parent_id)
150
129
for l in self.message.splitlines():
152
131
a('inventory:\n')
153
for path, ie in self._get_entries():
132
for path, ie in self.inventory.iter_entries():
154
133
a(self._entry_to_line(path, ie))
155
134
r.extend(self._revprops_to_lines())
137
assert isinstance(l, basestring), \
138
'%r of type %s is not a plain string' % (l, type(l))
156
139
return [line.encode('utf-8') for line in r]
158
def _get_entries(self):
159
return ((path, ie) for (path, versioned, kind, file_id, ie) in
160
self.tree.list_files(include_root=self.include_root))
162
141
def _escape_path(self, path):
163
if contains_linebreaks(path):
164
raise ValueError(path)
165
return unicode(path.replace('\\', '/').replace(' ', '\ '))
142
assert not contains_linebreaks(path)
143
return unicode(path.replace('\\', '/').replace(' ', '\ ')).encode('utf-8')
167
145
def _entry_to_line(self, path, ie):
168
146
"""Turn an inventory entry into a testament line"""
169
if contains_whitespace(ie.file_id):
170
raise ValueError(ie.file_id)
147
l = ' ' + str(ie.kind)
148
l += ' ' + self._escape_path(path)
149
assert not contains_whitespace(ie.file_id)
150
l += ' ' + unicode(ie.file_id).encode('utf-8')
173
151
if ie.kind == 'file':
174
152
# TODO: avoid switching on kind
176
raise AssertionError()
177
content = ie.text_sha1
154
l += ' ' + ie.text_sha1
179
155
elif ie.kind == 'symlink':
180
if not ie.symlink_target:
181
raise AssertionError()
182
content = self._escape_path(ie.symlink_target)
185
l = u' %s %s %s%s%s\n' % (ie.kind, self._escape_path(path),
186
ie.file_id.decode('utf8'),
187
content_spacer, content)
156
assert ie.symlink_target
157
l += ' ' + self._escape_path(ie.symlink_target)
190
161
def as_text(self):
193
164
def as_short_text(self):
194
165
"""Return short digest-based testament."""
195
return (self.short_header +
167
map(s.update, self.as_text_lines())
168
return ('bazaar-ng testament short form 1\n'
196
169
'revision-id: %s\n'
198
% (self.revision_id, self.as_sha1()))
171
% (self.revision_id, s.hexdigest()))
200
173
def _revprops_to_lines(self):
201
174
"""Pack up revision properties."""
204
177
r = ['properties:\n']
205
178
for name, value in sorted(self.revprops.items()):
206
if contains_whitespace(name):
207
raise ValueError(name)
179
assert isinstance(name, str)
180
assert not contains_whitespace(name)
208
181
r.append(' %s:\n' % name)
209
182
for line in value.splitlines():
210
r.append(u' %s\n' % line)
183
if not isinstance(line, str):
184
line = line.encode('utf-8')
185
r.append(' %s\n' % line)
214
return sha_strings(self.as_text_lines())
217
class StrictTestament(Testament):
218
"""This testament format is for use as a checksum in bundle format 0.8"""
220
long_header = 'bazaar-ng testament version 2.1\n'
221
short_header = 'bazaar-ng testament short form 2.1\n'
223
def _entry_to_line(self, path, ie):
224
l = Testament._entry_to_line(self, path, ie)[:-1]
225
l += ' ' + ie.revision
226
l += {True: ' yes\n', False: ' no\n'}[ie.executable]
230
class StrictTestament3(StrictTestament):
231
"""This testament format is for use as a checksum in bundle format 0.9+
233
It differs from StrictTestament by including data about the tree root.
236
long_header = 'bazaar testament version 3 strict\n'
237
short_header = 'bazaar testament short form 3 strict\n'
240
def _escape_path(self, path):
241
if contains_linebreaks(path):
242
raise ValueError(path)
245
return unicode(path.replace('\\', '/').replace(' ', '\ '))