« back to all changes in this revision
Viewing changes to bzrlib/inventory.py
- browse files at revision 75
- compare with another revision
- download diff
- download tarball
- view history from revision 75
- Committer: mbp at sourcefrog
- Date: 2005-03-23 23:52:10 UTC
- Revision ID: mbp@sourcefrog.net-20050323235210-5464746b93c39ed0
more notes on darcs
- files added:
- .bzrignore
- bzrlib
- doc
- elementtree
- notes
- files removed:
- .bzrignore
added
removed
bzrlib/inventory.py
1
#! /usr/bin/env python
2
# -*- coding: UTF-8 -*-
3
4
# This program is free software; you can redistribute it and/or modify
5
# it under the terms of the GNU General Public License as published by
6
# the Free Software Foundation; either version 2 of the License, or
7
# (at your option) any later version.
8
9
# This program is distributed in the hope that it will be useful,
10
# but WITHOUT ANY WARRANTY; without even the implied warranty of
11
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12
# GNU General Public License for more details.
13
14
# You should have received a copy of the GNU General Public License
15
# along with this program; if not, write to the Free Software
16
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17
18
"""Inventories map files to their name in a revision."""
19
20
21
__copyright__ = "Copyright (C) 2005 Canonical Ltd."
22
__author__ = "Martin Pool <mbp@canonical.com>"
23
24
import sys, os.path, types
25
from sets import Set
26
27
try:
28
from cElementTree import Element, ElementTree, SubElement
29
except ImportError:
30
from elementtree.ElementTree import Element, ElementTree, SubElement
31
32
from xml import XMLMixin
33
from errors import bailout
34
35
import bzrlib
36
from bzrlib.osutils import uuid, quotefn, splitpath, joinpath, appendpath
37
from bzrlib.trace import mutter
38
39
class InventoryEntry(XMLMixin):
40
"""Description of a versioned file.
41
42
An InventoryEntry has the following fields, which are also
43
present in the XML inventory-entry element:
44
45
* *file_id*
46
* *name*: (only the basename within the directory, must not
47
contain slashes)
48
* *kind*: "directory" or "file"
49
* *directory_id*: (if absent/null means the branch root directory)
50
* *text_sha1*: only for files
51
* *text_size*: in bytes, only for files
52
* *text_id*: identifier for the text version, only for files
53
54
InventoryEntries can also exist inside a WorkingTree
55
inventory, in which case they are not yet bound to a
56
particular revision of the file. In that case the text_sha1,
57
text_size and text_id are absent.
58
59
60
>>> i = Inventory()
61
>>> i.path2id('')
62
>>> i.add(InventoryEntry('123', 'src', kind='directory'))
63
>>> i.add(InventoryEntry('2323', 'hello.c', parent_id='123'))
64
>>> for j in i.iter_entries():
65
... print j
66
...
67
('src', InventoryEntry('123', 'src', kind='directory', parent_id=None))
68
('src/hello.c', InventoryEntry('2323', 'hello.c', kind='file', parent_id='123'))
69
>>> i.add(InventoryEntry('2323', 'bye.c', parent_id='123'))
70
Traceback (most recent call last):
71
...
72
BzrError: ('inventory already contains entry with id {2323}', [])
73
>>> i.add(InventoryEntry('2324', 'bye.c', parent_id='123'))
74
>>> i.add(InventoryEntry('2325', 'wibble', parent_id='123', kind='directory'))
75
>>> i.path2id('src/wibble')
76
'2325'
77
>>> '2325' in i
78
True
79
>>> i.add(InventoryEntry('2326', 'wibble.c', parent_id='2325'))
80
>>> i['2326']
81
InventoryEntry('2326', 'wibble.c', kind='file', parent_id='2325')
82
>>> for j in i.iter_entries():
83
... print j[0]
84
... assert i.path2id(j[0])
85
...
86
src
87
src/bye.c
88
src/hello.c
89
src/wibble
90
src/wibble/wibble.c
91
>>> i.id2path('2326')
92
'src/wibble/wibble.c'
93
94
:todo: Maybe also keep the full path of the entry, and the children?
95
But those depend on its position within a particular inventory, and
96
it would be nice not to need to hold the backpointer here.
97
"""
98
def __init__(self, file_id, name, kind='file', text_id=None,
99
parent_id=None):
100
"""Create an InventoryEntry
101
102
The filename must be a single component, relative to the
103
parent directory; it cannot be a whole path or relative name.
104
105
>>> e = InventoryEntry('123', 'hello.c')
106
>>> e.name
107
'hello.c'
108
>>> e.file_id
109
'123'
110
>>> e = InventoryEntry('123', 'src/hello.c')
111
Traceback (most recent call last):
112
BzrError: ("InventoryEntry name is not a simple filename: 'src/hello.c'", [])
113
"""
114
115
if len(splitpath(name)) != 1:
116
bailout('InventoryEntry name is not a simple filename: %r'
117
% name)
118
119
self.file_id = file_id
120
self.name = name
121
assert kind in ['file', 'directory']
122
self.kind = kind
123
self.text_id = text_id
124
self.parent_id = parent_id
125
self.text_sha1 = None
126
self.text_size = None
127
128
129
def copy(self):
130
other = InventoryEntry(self.file_id, self.name, self.kind,
131
self.text_id, self.parent_id)
132
other.text_sha1 = self.text_sha1
133
other.text_size = self.text_size
134
return other
135
136
137
def __repr__(self):
138
return ("%s(%r, %r, kind=%r, parent_id=%r)"
139
% (self.__class__.__name__,
140
self.file_id,
141
self.name,
142
self.kind,
143
self.parent_id))
144
145
146
def to_element(self):
147
"""Convert to XML element"""
148
e = Element('entry')
149
150
e.set('name', self.name)
151
e.set('file_id', self.file_id)
152
e.set('kind', self.kind)
153
154
if self.text_size is not None:
155
e.set('text_size', '%d' % self.text_size)
156
157
for f in ['text_id', 'text_sha1', 'parent_id']:
158
v = getattr(self, f)
159
if v is not None:
160
e.set(f, v)
161
162
e.tail = '\n'
163
164
return e
165
166
167
def from_element(cls, elt):
168
assert elt.tag == 'entry'
169
self = cls(elt.get('file_id'), elt.get('name'), elt.get('kind'))
170
self.text_id = elt.get('text_id')
171
self.text_sha1 = elt.get('text_sha1')
172
self.parent_id = elt.get('parent_id')
173
174
## mutter("read inventoryentry: %r" % (elt.attrib))
175
176
v = elt.get('text_size')
177
self.text_size = v and int(v)
178
179
return self
180
181
182
from_element = classmethod(from_element)
183
184
def __cmp__(self, other):
185
if self is other:
186
return 0
187
if not isinstance(other, InventoryEntry):
188
return NotImplemented
189
190
return cmp(self.file_id, other.file_id) \
191
or cmp(self.name, other.name) \
192
or cmp(self.text_sha1, other.text_sha1) \
193
or cmp(self.text_size, other.text_size) \
194
or cmp(self.text_id, other.text_id) \
195
or cmp(self.parent_id, other.parent_id) \
196
or cmp(self.kind, other.kind)
197
198
199
200
class Inventory(XMLMixin):
201
"""Inventory of versioned files in a tree.
202
203
An Inventory acts like a set of InventoryEntry items. You can
204
also look files up by their file_id or name.
205
206
May be read from and written to a metadata file in a tree. To
207
manipulate the inventory (for example to add a file), it is read
208
in, modified, and then written back out.
209
210
The inventory represents a typical unix file tree, with
211
directories containing files and subdirectories. We never store
212
the full path to a file, because renaming a directory implicitly
213
moves all of its contents. This class internally maintains a
214
lookup tree that allows the children under a directory to be
215
returned quickly.
216
217
InventoryEntry objects must not be modified after they are
218
inserted.
219
220
>>> inv = Inventory()
221
>>> inv.write_xml(sys.stdout)
222
<inventory>
223
</inventory>
224
>>> inv.add(InventoryEntry('123-123', 'hello.c'))
225
>>> inv['123-123'].name
226
'hello.c'
227
>>> for file_id in inv: print file_id
228
...
229
123-123
230
231
May be treated as an iterator or set to look up file ids:
232
233
>>> bool(inv.path2id('hello.c'))
234
True
235
>>> '123-123' in inv
236
True
237
238
May also look up by name:
239
240
>>> [x[0] for x in inv.iter_entries()]
241
['hello.c']
242
243
>>> inv.write_xml(sys.stdout)
244
<inventory>
245
<entry file_id="123-123" kind="file" name="hello.c" />
246
</inventory>
247
248
"""
249
250
## TODO: Clear up handling of files in subdirectories; we probably
251
## do want to be able to just look them up by name but this
252
## probably means gradually walking down the path, looking up as we go.
253
254
## TODO: Make sure only canonical filenames are stored.
255
256
## TODO: Do something sensible about the possible collisions on
257
## case-losing filesystems. Perhaps we should just always forbid
258
## such collisions.
259
260
## _tree should probably just be stored as
261
## InventoryEntry._children on each directory.
262
263
def __init__(self):
264
"""Create or read an inventory.
265
266
If a working directory is specified, the inventory is read
267
from there. If the file is specified, read from that. If not,
268
the inventory is created empty.
269
"""
270
self._byid = dict()
271
272
# _tree is indexed by parent_id; at each level a map from name
273
# to ie. The None entry is the root.
274
self._tree = {None: {}}
275
276
277
def __iter__(self):
278
return iter(self._byid)
279
280
281
def __len__(self):
282
"""Returns number of entries."""
283
return len(self._byid)
284
285
286
def iter_entries(self, parent_id=None):
287
"""Return (path, entry) pairs, in order by name."""
288
kids = self._tree[parent_id].items()
289
kids.sort()
290
for name, ie in kids:
291
yield name, ie
292
if ie.kind == 'directory':
293
for cn, cie in self.iter_entries(parent_id=ie.file_id):
294
yield joinpath([name, cn]), cie
295
296
297
def directories(self, include_root=True):
298
"""Return (path, entry) pairs for all directories.
299
"""
300
if include_root:
301
yield '', None
302
for path, entry in self.iter_entries():
303
if entry.kind == 'directory':
304
yield path, entry
305
306
307
308
def children(self, parent_id):
309
"""Return entries that are direct children of parent_id."""
310
return self._tree[parent_id]
311
312
313
314
# TODO: return all paths and entries
315
316
317
def __contains__(self, file_id):
318
"""True if this entry contains a file with given id.
319
320
>>> inv = Inventory()
321
>>> inv.add(InventoryEntry('123', 'foo.c'))
322
>>> '123' in inv
323
True
324
>>> '456' in inv
325
False
326
"""
327
return file_id in self._byid
328
329
330
def __getitem__(self, file_id):
331
"""Return the entry for given file_id.
332
333
>>> inv = Inventory()
334
>>> inv.add(InventoryEntry('123123', 'hello.c'))
335
>>> inv['123123'].name
336
'hello.c'
337
"""
338
return self._byid[file_id]
339
340
341
def add(self, entry):
342
"""Add entry to inventory.
343
344
To add a file to a branch ready to be committed, use Branch.add,
345
which calls this."""
346
if entry.file_id in self:
347
bailout("inventory already contains entry with id {%s}" % entry.file_id)
348
349
if entry.parent_id != None:
350
if entry.parent_id not in self:
351
bailout("parent_id %s of new entry not found in inventory"
352
% entry.parent_id)
353
354
if self._tree[entry.parent_id].has_key(entry.name):
355
bailout("%s is already versioned"
356
% appendpath(self.id2path(entry.parent_id), entry.name))
357
358
self._byid[entry.file_id] = entry
359
self._tree[entry.parent_id][entry.name] = entry
360
361
if entry.kind == 'directory':
362
self._tree[entry.file_id] = {}
363
364
365
def add_path(self, relpath, kind, file_id=None):
366
"""Add entry from a path.
367
368
The immediate parent must already be versioned"""
369
parts = bzrlib.osutils.splitpath(relpath)
370
if len(parts) == 0:
371
bailout("cannot re-add root of inventory")
372
373
if file_id is None:
374
file_id = bzrlib.branch.gen_file_id(relpath)
375
376
parent_id = self.path2id(parts[:-1])
377
ie = InventoryEntry(file_id, parts[-1],
378
kind=kind, parent_id=parent_id)
379
return self.add(ie)
380
381
382
def __delitem__(self, file_id):
383
"""Remove entry by id.
384
385
>>> inv = Inventory()
386
>>> inv.add(InventoryEntry('123', 'foo.c'))
387
>>> '123' in inv
388
True
389
>>> del inv['123']
390
>>> '123' in inv
391
False
392
"""
393
ie = self[file_id]
394
395
assert self._tree[ie.parent_id][ie.name] == ie
396
397
# TODO: Test deleting all children; maybe hoist to a separate
398
# deltree method?
399
if ie.kind == 'directory':
400
for cie in self._tree[file_id].values():
401
del self[cie.file_id]
402
del self._tree[file_id]
403
404
del self._byid[file_id]
405
del self._tree[ie.parent_id][ie.name]
406
407
408
def id_set(self):
409
return Set(self._byid)
410
411
412
def to_element(self):
413
"""Convert to XML Element"""
414
e = Element('inventory')
415
e.text = '\n'
416
for path, ie in self.iter_entries():
417
e.append(ie.to_element())
418
return e
419
420
421
def from_element(cls, elt):
422
"""Construct from XML Element
423
424
>>> inv = Inventory()
425
>>> inv.add(InventoryEntry('foo.c-123981239', 'foo.c'))
426
>>> elt = inv.to_element()
427
>>> inv2 = Inventory.from_element(elt)
428
>>> inv2 == inv
429
True
430
"""
431
assert elt.tag == 'inventory'
432
o = cls()
433
for e in elt:
434
o.add(InventoryEntry.from_element(e))
435
return o
436
437
from_element = classmethod(from_element)
438
439
440
def __cmp__(self, other):
441
"""Compare two sets by comparing their contents.
442
443
>>> i1 = Inventory()
444
>>> i2 = Inventory()
445
>>> i1 == i2
446
True
447
>>> i1.add(InventoryEntry('123', 'foo'))
448
>>> i1 == i2
449
False
450
>>> i2.add(InventoryEntry('123', 'foo'))
451
>>> i1 == i2
452
True
453
"""
454
if self is other:
455
return 0
456
457
if not isinstance(other, Inventory):
458
return NotImplemented
459
460
if self.id_set() ^ other.id_set():
461
return 1
462
463
for file_id in self._byid:
464
c = cmp(self[file_id], other[file_id])
465
if c: return c
466
467
return 0
468
469
470
def id2path(self, file_id):
471
"""Return as a list the path to file_id."""
472
p = []
473
while file_id != None:
474
ie = self[file_id]
475
p = [ie.name] + p
476
file_id = ie.parent_id
477
return joinpath(p)
478
479
480
481
def path2id(self, name):
482
"""Walk down through directories to return entry of last component.
483
484
names may be either a list of path components, or a single
485
string, in which case it is automatically split.
486
487
This returns the entry of the last component in the path,
488
which may be either a file or a directory.
489
"""
490
if isinstance(name, types.StringTypes):
491
name = splitpath(name)
492
493
parent_id = None
494
for f in name:
495
try:
496
cie = self._tree[parent_id][f]
497
assert cie.name == f
498
parent_id = cie.file_id
499
except KeyError:
500
# or raise an error?
501
return None
502
503
return parent_id
504
505
506
def get_child(self, parent_id, child_name):
507
return self._tree[parent_id].get(child_name)
508
509
510
def has_filename(self, names):
511
return bool(self.path2id(names))
512
513
514
def has_id(self, file_id):
515
assert isinstance(file_id, str)
516
return self._byid.has_key(file_id)
517
518
519
520
521
522
if __name__ == '__main__':
523
import doctest, inventory
524
doctest.testmod(inventory)
Loggerhead is a web-based interface for Breezy
Version: 2.0.1