summaryrefslogtreecommitdiffstats
path: root/tools/releasetools/ota_from_target_files.py
blob: e483b1c2d4047bfaa03224d298995ae0c6386ee5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
#!/usr/bin/env python
#
# Copyright (C) 2008 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""
Given a target-files zipfile, produces an OTA package that installs
that build.  An incremental OTA is produced if -i is given, otherwise
a full OTA is produced.

Usage:  ota_from_target_files [flags] input_target_files output_ota_package

  --board_config  <file>
      Deprecated.

  -k (--package_key) <key> Key to use to sign the package (default is
      the value of default_system_dev_certificate from the input
      target-files's META/misc_info.txt, or
      "build/target/product/security/testkey" if that value is not
      specified).

      For incremental OTAs, the default value is based on the source
      target-file, not the target build.

  -i  (--incremental_from)  <file>
      Generate an incremental OTA using the given target-files zip as
      the starting build.

  --full_radio
      When generating an incremental OTA, always include a full copy of
      radio image. This option is only meaningful when -i is specified,
      because a full radio is always included in a full OTA if applicable.

 --full_bootloader
      When generating an incremental OTA, always include a full copy of
      bootloader image. This option is only meaningful when -i is specified,
      because a full bootloader is always included in a full OTA if applicable.

  -v  (--verify)
      Remount and verify the checksums of the files written to the
      system and vendor (if used) partitions.  Incremental builds only.

  -o  (--oem_settings)  <file>
      Use the file to specify the expected OEM-specific properties
      on the OEM partition of the intended device.

  -w  (--wipe_user_data)
      Generate an OTA package that will wipe the user data partition
      when installed.

  -n  (--no_prereq)
      Omit the timestamp prereq check normally included at the top of
      the build scripts (used for developer OTA packages which
      legitimately need to go back and forth).

  -e  (--extra_script)  <file>
      Insert the contents of file at the end of the update script.

  -a  (--aslr_mode)  <on|off>
      Specify whether to turn on ASLR for the package (on by default).

  -2  (--two_step)
      Generate a 'two-step' OTA package, where recovery is updated
      first, so that any changes made to the system partition are done
      using the new recovery (new kernel, etc.).

  --block
      Generate a block-based OTA if possible.  Will fall back to a
      file-based OTA if the target_files is older and doesn't support
      block-based OTAs.

  -b  (--binary)  <file>
      Use the given binary as the update-binary in the output package,
      instead of the binary in the build's target_files.  Use for
      development only.

  -t  (--worker_threads) <int>
      Specifies the number of worker-threads that will be used when
      generating patches for incremental updates (defaults to 3).

  --stash_threshold <float>
      Specifies the threshold that will be used to compute the maximum
      allowed stash size (defaults to 0.8).

  --backup <boolean>
      Enable or disable the execution of backuptool.sh.
      Disabled by default.

  --override_device <device>
      Override device-specific asserts. Can be a comma-separated list.

  --override_prop <boolean>
      Override build.prop items with custom vendor init.
      Enabled when TARGET_UNIFIED_DEVICE is defined in BoardConfig

"""

from __future__ import print_function

import sys

if sys.hexversion < 0x02070000:
  print("Python 2.7 or newer is required.", file=sys.stderr)
  sys.exit(1)

import multiprocessing
import os
import tempfile
import zipfile

import common
import edify_generator
import sparse_img

OPTIONS = common.OPTIONS
OPTIONS.package_key = None
OPTIONS.incremental_source = None
OPTIONS.verify = False
OPTIONS.require_verbatim = set()
OPTIONS.prohibit_verbatim = set(("system/build.prop",))
OPTIONS.patch_threshold = 0.95
OPTIONS.wipe_user_data = False
OPTIONS.omit_prereq = False
OPTIONS.extra_script = None
OPTIONS.aslr_mode = True
OPTIONS.worker_threads = multiprocessing.cpu_count() // 2
if OPTIONS.worker_threads == 0:
  OPTIONS.worker_threads = 1
OPTIONS.two_step = False
OPTIONS.no_signing = False
OPTIONS.block_based = False
OPTIONS.updater_binary = None
OPTIONS.oem_source = None
OPTIONS.fallback_to_full = True
OPTIONS.full_radio = False
OPTIONS.full_bootloader = False
OPTIONS.backuptool = False
OPTIONS.override_device = 'auto'
OPTIONS.override_prop = False

def MostPopularKey(d, default):
  """Given a dict, return the key corresponding to the largest
  value.  Returns 'default' if the dict is empty."""
  x = [(v, k) for (k, v) in d.items()]
  if not x:
    return default
  x.sort()
  return x[-1][1]


def IsSymlink(info):
  """Return true if the zipfile.ZipInfo object passed in represents a
  symlink."""
  return (info.external_attr >> 16) & 0o770000 == 0o120000

def IsRegular(info):
  """Return true if the zipfile.ZipInfo object passed in represents a
  symlink."""
  return (info.external_attr >> 28) == 0o10

def ClosestFileMatch(src, tgtfiles, existing):
  """Returns the closest file match between a source file and list
     of potential matches.  The exact filename match is preferred,
     then the sha1 is searched for, and finally a file with the same
     basename is evaluated.  Rename support in the updater-binary is
     required for the latter checks to be used."""

  result = tgtfiles.get("path:" + src.name)
  if result is not None:
    return result

  if not OPTIONS.target_info_dict.get("update_rename_support", False):
    return None

  if src.size < 1000:
    return None

  result = tgtfiles.get("sha1:" + src.sha1)
  if result is not None and existing.get(result.name) is None:
    return result
  result = tgtfiles.get("file:" + src.name.split("/")[-1])
  if result is not None and existing.get(result.name) is None:
    return result
  return None

class ItemSet(object):
  def __init__(self, partition, fs_config):
    self.partition = partition
    self.fs_config = fs_config
    self.ITEMS = {}

  def Get(self, name, is_dir=False):
    if name not in self.ITEMS:
      self.ITEMS[name] = Item(self, name, is_dir=is_dir)
    return self.ITEMS[name]

  def GetMetadata(self, input_zip):
    # The target_files contains a record of what the uid,
    # gid, and mode are supposed to be.
    output = input_zip.read(self.fs_config)

    for line in output.split("\n"):
      if not line:
        continue
      columns = line.split()
      name, uid, gid, mode = columns[:4]
      selabel = None
      capabilities = None

      # After the first 4 columns, there are a series of key=value
      # pairs. Extract out the fields we care about.
      for element in columns[4:]:
        key, value = element.split("=")
        if key == "selabel":
          selabel = value
        if key == "capabilities":
          capabilities = value

      i = self.ITEMS.get(name, None)
      if i is not None:
        i.uid = int(uid)
        i.gid = int(gid)
        i.mode = int(mode, 8)
        i.selabel = selabel
        i.capabilities = capabilities
        if i.is_dir:
          i.children.sort(key=lambda i: i.name)

    # set metadata for the files generated by this script.
    i = self.ITEMS.get("system/recovery-from-boot.p", None)
    if i:
      i.uid, i.gid, i.mode, i.selabel, i.capabilities = 0, 0, 0o644, None, None
    i = self.ITEMS.get("system/etc/install-recovery.sh", None)
    if i:
      i.uid, i.gid, i.mode, i.selabel, i.capabilities = 0, 0, 0o544, None, None


class Item(object):
  """Items represent the metadata (user, group, mode) of files and
  directories in the system image."""
  def __init__(self, itemset, name, is_dir=False):
    self.itemset = itemset
    self.name = name
    self.uid = None
    self.gid = None
    self.mode = None
    self.selabel = None
    self.capabilities = None
    self.is_dir = is_dir
    self.descendants = None
    self.best_subtree = None

    if name:
      self.parent = itemset.Get(os.path.dirname(name), is_dir=True)
      self.parent.children.append(self)
    else:
      self.parent = None
    if self.is_dir:
      self.children = []

  def Dump(self, indent=0):
    if self.uid is not None:
      print("%s%s %d %d %o" % (
          "  " * indent, self.name, self.uid, self.gid, self.mode))
    else:
      print("%s%s %s %s %s" % (
          "  " * indent, self.name, self.uid, self.gid, self.mode))
    if self.is_dir:
      print("%s%s" % ("  "*indent, self.descendants))
      print("%s%s" % ("  "*indent, self.best_subtree))
      for i in self.children:
        i.Dump(indent=indent+1)

  def CountChildMetadata(self):
    """Count up the (uid, gid, mode, selabel, capabilities) tuples for
    all children and determine the best strategy for using set_perm_recursive
    and set_perm to correctly chown/chmod all the files to their desired
    values.  Recursively calls itself for all descendants.

    Returns a dict of {(uid, gid, dmode, fmode, selabel, capabilities): count}
    counting up all descendants of this node.  (dmode or fmode may be None.)
    Also sets the best_subtree of each directory Item to the (uid, gid, dmode,
    fmode, selabel, capabilities) tuple that will match the most descendants of
    that Item.
    """

    assert self.is_dir
    key = (self.uid, self.gid, self.mode, None, self.selabel,
           self.capabilities)
    self.descendants = {key: 1}
    d = self.descendants
    for i in self.children:
      if i.is_dir:
        for k, v in i.CountChildMetadata().items():
          d[k] = d.get(k, 0) + v
      else:
        k = (i.uid, i.gid, None, i.mode, i.selabel, i.capabilities)
        d[k] = d.get(k, 0) + 1

    # Find the (uid, gid, dmode, fmode, selabel, capabilities)
    # tuple that matches the most descendants.

    # First, find the (uid, gid) pair that matches the most
    # descendants.
    ug = {}
    for (uid, gid, _, _, _, _), count in d.items():
      ug[(uid, gid)] = ug.get((uid, gid), 0) + count
    ug = MostPopularKey(ug, (0, 0))

    # Now find the dmode, fmode, selabel, and capabilities that match
    # the most descendants with that (uid, gid), and choose those.
    best_dmode = (0, 0o755)
    best_fmode = (0, 0o644)
    best_selabel = (0, None)
    best_capabilities = (0, None)
    for k, count in d.items():
      if k[:2] != ug:
        continue
      if k[2] is not None and count >= best_dmode[0]:
        best_dmode = (count, k[2])
      if k[3] is not None and count >= best_fmode[0]:
        best_fmode = (count, k[3])
      if k[4] is not None and count >= best_selabel[0]:
        best_selabel = (count, k[4])
      if k[5] is not None and count >= best_capabilities[0]:
        best_capabilities = (count, k[5])
    self.best_subtree = ug + (
        best_dmode[1], best_fmode[1], best_selabel[1], best_capabilities[1])

    return d

  def SetPermissions(self, script):
    """Append set_perm/set_perm_recursive commands to 'script' to
    set all permissions, users, and groups for the tree of files
    rooted at 'self'."""

    self.CountChildMetadata()

    def recurse(item, current):
      # current is the (uid, gid, dmode, fmode, selabel, capabilities) tuple
      # that the current item (and all its children) have already been set to.
      # We only need to issue set_perm/set_perm_recursive commands if we're
      # supposed to be something different.
      if item.is_dir:
        if current != item.best_subtree:
          script.SetPermissionsRecursive("/"+item.name, *item.best_subtree)
          current = item.best_subtree

        if item.uid != current[0] or item.gid != current[1] or \
           item.mode != current[2] or item.selabel != current[4] or \
           item.capabilities != current[5]:
          script.SetPermissions("/"+item.name, item.uid, item.gid,
                                item.mode, item.selabel, item.capabilities)

        for i in item.children:
          recurse(i, current)
      else:
        if item.uid != current[0] or item.gid != current[1] or \
               item.mode != current[3] or item.selabel != current[4] or \
               item.capabilities != current[5]:
          script.SetPermissions("/"+item.name, item.uid, item.gid,
                                item.mode, item.selabel, item.capabilities)

    recurse(self, (-1, -1, -1, -1, None, None))


def CopyPartitionFiles(itemset, input_zip, output_zip=None, substitute=None):
  """Copies files for the partition in the input zip to the output
  zip.  Populates the Item class with their metadata, and returns a
  list of symlinks.  output_zip may be None, in which case the copy is
  skipped (but the other side effects still happen).  substitute is an
  optional dict of {output filename: contents} to be output instead of
  certain input files.
  """

  symlinks = []

  partition = itemset.partition

  for info in input_zip.infolist():
    prefix = partition.upper() + "/"
    if info.filename.startswith(prefix):
      basefilename = info.filename[len(prefix):]
      if IsSymlink(info):
        symlinks.append((input_zip.read(info.filename),
                         "/" + partition + "/" + basefilename))
      else:
        import copy
        info2 = copy.copy(info)
        fn = info2.filename = partition + "/" + basefilename
        if substitute and fn in substitute and substitute[fn] is None:
          continue
        if output_zip is not None:
          if substitute and fn in substitute:
            data = substitute[fn]
          else:
            data = input_zip.read(info.filename)
          common.ZipWriteStr(output_zip, info2, data)
        if fn.endswith("/"):
          itemset.Get(fn[:-1], is_dir=True)
        else:
          itemset.Get(fn)

  symlinks.sort()
  return symlinks


def SignOutput(temp_zip_name, output_zip_name):
  key_passwords = common.GetKeyPasswords([OPTIONS.package_key])
  pw = key_passwords[OPTIONS.package_key]

  common.SignFile(temp_zip_name, output_zip_name, OPTIONS.package_key, pw,
                  whole_file=True)


def AppendAssertions(script, info_dict, oem_dict=None):
  oem_props = info_dict.get("oem_fingerprint_properties")
  if oem_props is None or len(oem_props) == 0:
    if OPTIONS.override_device == "auto":
      device = GetBuildProp("ro.product.device", info_dict)
    else:
      device = OPTIONS.override_device
    script.AssertDevice(device)
  else:
    if oem_dict is None:
      raise common.ExternalError(
          "No OEM file provided to answer expected assertions")
    for prop in oem_props.split():
      if oem_dict.get(prop) is None:
        raise common.ExternalError(
            "The OEM file is missing the property %s" % prop)
      script.AssertOemProperty(prop, oem_dict.get(prop))


def HasRecoveryPatch(target_files_zip):
  try:
    target_files_zip.getinfo("SYSTEM/recovery-from-boot.p")
    return True
  except KeyError:
    return False

def HasVendorPartition(target_files_zip):
  try:
    target_files_zip.getinfo("VENDOR/")
    return True
  except KeyError:
    return False

def GetOemProperty(name, oem_props, oem_dict, info_dict):
  if oem_props is not None and name in oem_props:
    return oem_dict[name]
  return GetBuildProp(name, info_dict)

def CalculateFingerprint(oem_props, oem_dict, info_dict):
  if OPTIONS.override_prop:
    return GetBuildProp("ro.build.date.utc", info_dict)
  if oem_props is None:
    return GetBuildProp("ro.build.fingerprint", info_dict)
  return "%s/%s/%s:%s" % (
      GetOemProperty("ro.product.brand", oem_props, oem_dict, info_dict),
      GetOemProperty("ro.product.name", oem_props, oem_dict, info_dict),
      GetOemProperty("ro.product.device", oem_props, oem_dict, info_dict),
      GetBuildProp("ro.build.thumbprint", info_dict))


def GetImage(which, tmpdir, info_dict):
  # Return an image object (suitable for passing to BlockImageDiff)
  # for the 'which' partition (most be "system" or "vendor").  If a
  # prebuilt image and file map are found in tmpdir they are used,
  # otherwise they are reconstructed from the individual files.

  assert which in ("system", "vendor")

  path = os.path.join(tmpdir, "IMAGES", which + ".img")
  mappath = os.path.join(tmpdir, "IMAGES", which + ".map")
  if os.path.exists(path) and os.path.exists(mappath):
    print("using %s.img from target-files" % which)
    # This is a 'new' target-files, which already has the image in it.

  else:
    print("building %s.img from target-files" % which)

    # This is an 'old' target-files, which does not contain images
    # already built.  Build them.

    mappath = tempfile.mkstemp()[1]
    OPTIONS.tempfiles.append(mappath)

    import add_img_to_target_files
    if which == "system":
      path = add_img_to_target_files.BuildSystem(
          tmpdir, info_dict, block_list=mappath)
    elif which == "vendor":
      path = add_img_to_target_files.BuildVendor(
          tmpdir, info_dict, block_list=mappath)

  # Bug: http://b/20939131
  # In ext4 filesystems, block 0 might be changed even being mounted
  # R/O. We add it to clobbered_blocks so that it will be written to the
  # target unconditionally. Note that they are still part of care_map.
  clobbered_blocks = "0"

  return sparse_img.SparseImage(path, mappath, clobbered_blocks)


def CopyInstallTools(output_zip):
  install_path = os.path.join(OPTIONS.input_tmp, "INSTALL")
  for root, subdirs, files in os.walk(install_path):
    for f in files:
      install_source = os.path.join(root, f)
      install_target = os.path.join("install", os.path.relpath(root, install_path), f)
      output_zip.write(install_source, install_target)


def WriteFullOTAPackage(input_zip, output_zip):
  # TODO: how to determine this?  We don't know what version it will
  # be installed on top of. For now, we expect the API just won't
  # change very often. Similarly for fstab, it might have changed
  # in the target build.
  script = edify_generator.EdifyGenerator(3, OPTIONS.info_dict)

  oem_props = OPTIONS.info_dict.get("oem_fingerprint_properties")
  recovery_mount_options = OPTIONS.info_dict.get("recovery_mount_options")
  oem_dict = None
  if oem_props is not None and len(oem_props) > 0:
    if OPTIONS.oem_source is None:
      raise common.ExternalError("OEM source required for this build")
    script.Mount("/oem", recovery_mount_options)
    oem_dict = common.LoadDictionaryFromLines(
        open(OPTIONS.oem_source).readlines())

  if OPTIONS.override_prop:
    metadata = {"post-timestamp": GetBuildProp("ro.build.date.utc",
                                               OPTIONS.info_dict),
                }
  else:
    metadata = {"post-build": CalculateFingerprint(
                                 oem_props, oem_dict, OPTIONS.info_dict),
                "pre-device": GetOemProperty("ro.product.device", oem_props, oem_dict,
                                           OPTIONS.info_dict),
                "post-timestamp": GetBuildProp("ro.build.date.utc",
                                             OPTIONS.info_dict),
                }

  device_specific = common.DeviceSpecificParams(
      input_zip=input_zip,
      input_version=OPTIONS.info_dict["recovery_api_version"],
      output_zip=output_zip,
      script=script,
      input_tmp=OPTIONS.input_tmp,
      metadata=metadata,
      info_dict=OPTIONS.info_dict)

  has_recovery_patch = HasRecoveryPatch(input_zip)
  block_based = OPTIONS.block_based and has_recovery_patch

  #if not OPTIONS.omit_prereq:
  #  ts = GetBuildProp("ro.build.date.utc", OPTIONS.info_dict)
  #  ts_text = GetBuildProp("ro.build.date", OPTIONS.info_dict)
  #  script.AssertOlderBuild(ts, ts_text)

  AppendAssertions(script, OPTIONS.info_dict, oem_dict)
  device_specific.FullOTA_Assertions()

  # Two-step package strategy (in chronological order, which is *not*
  # the order in which the generated script has things):
  #
  # if stage is not "2/3" or "3/3":
  #    write recovery image to boot partition
  #    set stage to "2/3"
  #    reboot to boot partition and restart recovery
  # else if stage is "2/3":
  #    write recovery image to recovery partition
  #    set stage to "3/3"
  #    reboot to recovery partition and restart recovery
  # else:
  #    (stage must be "3/3")
  #    set stage to ""
  #    do normal full package installation:
  #       wipe and install system, boot image, etc.
  #       set up system to update recovery partition on first boot
  #    complete script normally
  #    (allow recovery to mark itself finished and reboot)

  recovery_img = common.GetBootableImage("recovery.img", "recovery.img",
                                         OPTIONS.input_tmp, "RECOVERY")
  if OPTIONS.two_step:
    if not OPTIONS.info_dict.get("multistage_support", None):
      assert False, "two-step packages not supported by this build"
    fs = OPTIONS.info_dict["fstab"]["/misc"]
    assert fs.fs_type.upper() == "EMMC", \
        "two-step packages only supported on devices with EMMC /misc partitions"
    bcb_dev = {"bcb_dev": fs.device}
    common.ZipWriteStr(output_zip, "recovery.img", recovery_img.data)
    script.AppendExtra("""
if get_stage("%(bcb_dev)s") == "2/3" then
""" % bcb_dev)
    script.WriteRawImage("/recovery", "recovery.img")
    script.AppendExtra("""
set_stage("%(bcb_dev)s", "3/3");
reboot_now("%(bcb_dev)s", "recovery");
else if get_stage("%(bcb_dev)s") == "3/3" then
""" % bcb_dev)

  # Dump fingerprints
  script.Print("Target: %s" % CalculateFingerprint(
      oem_props, oem_dict, OPTIONS.info_dict))

  script.AppendExtra("ifelse(is_mounted(\"/system\"), unmount(\"/system\"));")
  device_specific.FullOTA_InstallBegin()

  CopyInstallTools(output_zip)
  script.UnpackPackageDir("install", "/tmp/install")
  script.SetPermissionsRecursive("/tmp/install", 0, 0, 0o755, 0o644, None, None)
  script.SetPermissionsRecursive("/tmp/install/bin", 0, 0, 0o755, 0o755, None, None)

  if OPTIONS.backuptool:
    script.Mount("/system")
    script.RunBackup("backup")
    script.Unmount("/system")

  system_progress = 0.75

  if OPTIONS.wipe_user_data:
    system_progress -= 0.1
  if HasVendorPartition(input_zip):
    system_progress -= 0.1

  if not OPTIONS.wipe_user_data:
    script.AppendExtra("if is_mounted(\"/data\") then")
    script.ValidateSignatures("data")
    script.AppendExtra("else")
    script.Mount("/data")
    script.ValidateSignatures("data")
    script.Unmount("/data")
    script.AppendExtra("endif;")

  if "selinux_fc" in OPTIONS.info_dict:
    WritePolicyConfig(OPTIONS.info_dict["selinux_fc"], output_zip)

  recovery_mount_options = OPTIONS.info_dict.get("recovery_mount_options")

  system_items = ItemSet("system", "META/filesystem_config.txt")
  script.ShowProgress(system_progress, 0)

  if block_based:
    # Full OTA is done as an "incremental" against an empty source
    # image.  This has the effect of writing new data from the package
    # to the entire partition, but lets us reuse the updater code that
    # writes incrementals to do it.
    system_tgt = GetImage("system", OPTIONS.input_tmp, OPTIONS.info_dict)
    system_tgt.ResetFileMap()
    system_diff = common.BlockDifference("system", system_tgt, src=None)
    system_diff.WriteScript(script, output_zip)
  else:
    script.FormatPartition("/system")
    script.Mount("/system", recovery_mount_options)
    if not has_recovery_patch:
      script.UnpackPackageDir("recovery", "/system")
    script.UnpackPackageDir("system", "/system")

    symlinks = CopyPartitionFiles(system_items, input_zip, output_zip)
    script.MakeSymlinks(symlinks)

  boot_img = common.GetBootableImage("boot.img", "boot.img",
                                     OPTIONS.input_tmp, "BOOT")

  if not block_based:
    def output_sink(fn, data):
      common.ZipWriteStr(output_zip, "recovery/" + fn, data)
      system_items.Get("system/" + fn)

    common.MakeRecoveryPatch(OPTIONS.input_tmp, output_sink,
                             recovery_img, boot_img)

    system_items.GetMetadata(input_zip)
    system_items.Get("system").SetPermissions(script)

  if HasVendorPartition(input_zip):
    vendor_items = ItemSet("vendor", "META/vendor_filesystem_config.txt")
    script.ShowProgress(0.1, 0)

    if block_based:
      vendor_tgt = GetImage("vendor", OPTIONS.input_tmp, OPTIONS.info_dict)
      vendor_tgt.ResetFileMap()
      vendor_diff = common.BlockDifference("vendor", vendor_tgt)
      vendor_diff.WriteScript(script, output_zip)
    else:
      script.FormatPartition("/vendor")
      script.Mount("/vendor", recovery_mount_options)
      script.UnpackPackageDir("vendor", "/vendor")

      symlinks = CopyPartitionFiles(vendor_items, input_zip, output_zip)
      script.MakeSymlinks(symlinks)

      vendor_items.GetMetadata(input_zip)
      vendor_items.Get("vendor").SetPermissions(script)

  common.CheckSize(boot_img.data, "boot.img", OPTIONS.info_dict)
  common.ZipWriteStr(output_zip, "boot.img", boot_img.data)

  device_specific.FullOTA_PostValidate()

  if OPTIONS.backuptool:
    script.ShowProgress(0.02, 10)
    if block_based:
      script.Mount("/system")
    script.RunBackup("restore")
    if block_based:
      script.Unmount("/system")

  script.ShowProgress(0.05, 5)
  script.WriteRawImage("/boot", "boot.img")

  script.ShowProgress(0.2, 10)
  device_specific.FullOTA_InstallEnd()

  if OPTIONS.extra_script is not None:
    script.AppendExtra(OPTIONS.extra_script)

  script.UnmountAll()

  if OPTIONS.wipe_user_data:
    script.ShowProgress(0.1, 10)
    script.FormatPartition("/data")

  if OPTIONS.two_step:
    script.AppendExtra("""
set_stage("%(bcb_dev)s", "");
""" % bcb_dev)
    script.AppendExtra("else\n")
    script.WriteRawImage("/boot", "recovery.img")
    script.AppendExtra("""
set_stage("%(bcb_dev)s", "2/3");
reboot_now("%(bcb_dev)s", "");
endif;
endif;
""" % bcb_dev)
  script.AddToZip(input_zip, output_zip, input_path=OPTIONS.updater_binary)
  WriteMetadata(metadata, output_zip)

  common.ZipWriteStr(output_zip, "system/build.prop",
                     ""+input_zip.read("SYSTEM/build.prop"))

  common.ZipWriteStr(output_zip, "META-INF/org/lineageos/releasekey",
                     ""+input_zip.read("META/releasekey.txt"))

def WritePolicyConfig(file_name, output_zip):
  common.ZipWrite(output_zip, file_name, os.path.basename(file_name))

def WriteMetadata(metadata, output_zip):
  common.ZipWriteStr(output_zip, "META-INF/com/android/metadata",
                     "".join(["%s=%s\n" % kv
                              for kv in sorted(metadata.items())]))


def LoadPartitionFiles(z, partition):
  """Load all the files from the given partition in a given target-files
  ZipFile, and return a dict of {filename: File object}."""
  out = {}
  prefix = partition.upper() + "/"
  for info in z.infolist():
    if info.filename.startswith(prefix) and not IsSymlink(info):
      basefilename = info.filename[len(prefix):]
      fn = partition + "/" + basefilename
      data = z.read(info.filename)
      out[fn] = common.File(fn, data)
  return out


def GetBuildProp(prop, info_dict):
  """Return the fingerprint of the build of a given target-files info_dict."""
  try:
    return info_dict.get("build.prop", {})[prop]
  except KeyError:
    raise common.ExternalError("couldn't find %s in build.prop" % (prop,))


def AddToKnownPaths(filename, known_paths):
  if filename[-1] == "/":
    return
  dirs = filename.split("/")[:-1]
  while len(dirs) > 0:
    path = "/".join(dirs)
    if path in known_paths:
      break
    known_paths.add(path)
    dirs.pop()


def WriteBlockIncrementalOTAPackage(target_zip, source_zip, output_zip):
  source_version = OPTIONS.source_info_dict["recovery_api_version"]
  target_version = OPTIONS.target_info_dict["recovery_api_version"]

  if source_version == 0:
    print ("WARNING: generating edify script for a source that "
           "can't install it.")
  script = edify_generator.EdifyGenerator(
      source_version, OPTIONS.target_info_dict,
      fstab=OPTIONS.source_info_dict["fstab"])

  if OPTIONS.override_prop:
    metadata = {"post-timestamp": GetBuildProp("ro.build.date.utc",
                                               OPTIONS.target_info_dict),
                }
  else:
    metadata = {"pre-device": GetBuildProp("ro.product.device",
                                           OPTIONS.source_info_dict),
                "post-timestamp": GetBuildProp("ro.build.date.utc",
                                               OPTIONS.target_info_dict),
                }

  device_specific = common.DeviceSpecificParams(
      source_zip=source_zip,
      source_version=source_version,
      target_zip=target_zip,
      input_zip=target_zip,
      target_version=target_version,
      input_version=target_version,
      output_zip=output_zip,
      script=script,
      metadata=metadata,
      info_dict=OPTIONS.source_info_dict)

  # TODO: Currently this works differently from WriteIncrementalOTAPackage().
  # This function doesn't consider thumbprints when writing
  # metadata["pre/post-build"]. One possible reason is that the current
  # devices with thumbprints are all using file-based OTAs. Long term we
  # should factor out the common parts into a shared one to avoid further
  # divergence.
  if not OPTIONS.override_prop:
    source_fp = GetBuildProp("ro.build.fingerprint", OPTIONS.source_info_dict)
    target_fp = GetBuildProp("ro.build.fingerprint", OPTIONS.target_info_dict)
    metadata["pre-build"] = source_fp
    metadata["post-build"] = target_fp

  source_boot = common.GetBootableImage(
      "/tmp/boot.img", "boot.img", OPTIONS.source_tmp, "BOOT",
      OPTIONS.source_info_dict)
  target_boot = common.GetBootableImage(
      "/tmp/boot.img", "boot.img", OPTIONS.target_tmp, "BOOT")
  updating_boot = (not OPTIONS.two_step and
                   (source_boot.data != target_boot.data))

  target_recovery = common.GetBootableImage(
      "/tmp/recovery.img", "recovery.img", OPTIONS.target_tmp, "RECOVERY")

  system_src = GetImage("system", OPTIONS.source_tmp, OPTIONS.source_info_dict)
  system_tgt = GetImage("system", OPTIONS.target_tmp, OPTIONS.target_info_dict)

  blockimgdiff_version = 1
  if OPTIONS.info_dict:
    blockimgdiff_version = max(
        int(i) for i in
        OPTIONS.info_dict.get("blockimgdiff_versions", "1").split(","))

  system_diff = common.BlockDifference("system", system_tgt, system_src,
                                       version=blockimgdiff_version)

  if HasVendorPartition(target_zip):
    if not HasVendorPartition(source_zip):
      raise RuntimeError("can't generate incremental that adds /vendor")
    vendor_src = GetImage("vendor", OPTIONS.source_tmp,
                          OPTIONS.source_info_dict)
    vendor_tgt = GetImage("vendor", OPTIONS.target_tmp,
                          OPTIONS.target_info_dict)
    vendor_diff = common.BlockDifference("vendor", vendor_tgt, vendor_src,
                                         version=blockimgdiff_version)
  else:
    vendor_diff = None

  oem_props = OPTIONS.target_info_dict.get("oem_fingerprint_properties")
  recovery_mount_options = OPTIONS.source_info_dict.get(
      "recovery_mount_options")
  oem_dict = None
  if oem_props is not None and len(oem_props) > 0:
    if OPTIONS.oem_source is None:
      raise common.ExternalError("OEM source required for this build")
    script.Mount("/oem", recovery_mount_options)
    oem_dict = common.LoadDictionaryFromLines(
        open(OPTIONS.oem_source).readlines())

  AppendAssertions(script, OPTIONS.target_info_dict, oem_dict)
  device_specific.IncrementalOTA_Assertions()

  # Two-step incremental package strategy (in chronological order,
  # which is *not* the order in which the generated script has
  # things):
  #
  # if stage is not "2/3" or "3/3":
  #    do verification on current system
  #    write recovery image to boot partition
  #    set stage to "2/3"
  #    reboot to boot partition and restart recovery
  # else if stage is "2/3":
  #    write recovery image to recovery partition
  #    set stage to "3/3"
  #    reboot to recovery partition and restart recovery
  # else:
  #    (stage must be "3/3")
  #    perform update:
  #       patch system files, etc.
  #       force full install of new boot image
  #       set up system to update recovery partition on first boot
  #    complete script normally
  #    (allow recovery to mark itself finished and reboot)

  if OPTIONS.two_step:
    if not OPTIONS.source_info_dict.get("multistage_support", None):
      assert False, "two-step packages not supported by this build"
    fs = OPTIONS.source_info_dict["fstab"]["/misc"]
    assert fs.fs_type.upper() == "EMMC", \
        "two-step packages only supported on devices with EMMC /misc partitions"
    bcb_dev = {"bcb_dev": fs.device}
    common.ZipWriteStr(output_zip, "recovery.img", target_recovery.data)
    script.AppendExtra("""
if get_stage("%(bcb_dev)s") == "2/3" then
""" % bcb_dev)
    script.AppendExtra("sleep(20);\n")
    script.WriteRawImage("/recovery", "recovery.img")
    script.AppendExtra("""
set_stage("%(bcb_dev)s", "3/3");
reboot_now("%(bcb_dev)s", "recovery");
else if get_stage("%(bcb_dev)s") != "3/3" then
""" % bcb_dev)

  # Dump fingerprints
  script.Print("Source: %s" % CalculateFingerprint(
      oem_props, oem_dict, OPTIONS.source_info_dict))
  script.Print("Target: %s" % CalculateFingerprint(
      oem_props, oem_dict, OPTIONS.target_info_dict))

  script.Print("Verifying current system...")

  device_specific.IncrementalOTA_VerifyBegin()

  if oem_props is None:
    # When blockimgdiff version is less than 3 (non-resumable block-based OTA),
    # patching on a device that's already on the target build will damage the
    # system. Because operations like move don't check the block state, they
    # always apply the changes unconditionally.
    if blockimgdiff_version <= 2:
      script.AssertSomeFingerprint(source_fp)
    else:
      script.AssertSomeFingerprint(source_fp, target_fp)
  else:
    if blockimgdiff_version <= 2:
      script.AssertSomeThumbprint(
          GetBuildProp("ro.build.thumbprint", OPTIONS.source_info_dict))
    else:
      script.AssertSomeThumbprint(
          GetBuildProp("ro.build.thumbprint", OPTIONS.target_info_dict),
          GetBuildProp("ro.build.thumbprint", OPTIONS.source_info_dict))

  if updating_boot:
    boot_type, boot_device = common.GetTypeAndDevice(
        "/boot", OPTIONS.source_info_dict)
    d = common.Difference(target_boot, source_boot)
    _, _, d = d.ComputePatch()
    if d is None:
      include_full_boot = True
      common.ZipWriteStr(output_zip, "boot.img", target_boot.data)
    else:
      include_full_boot = False

      print("boot      target: %d  source: %d  diff: %d" % (
          target_boot.size, source_boot.size, len(d)))

      common.ZipWriteStr(output_zip, "patch/boot.img.p", d)

      script.PatchCheck("%s:%s:%d:%s:%d:%s" %
                        (boot_type, boot_device,
                         source_boot.size, source_boot.sha1,
                         target_boot.size, target_boot.sha1))

  device_specific.IncrementalOTA_VerifyEnd()

  if OPTIONS.two_step:
    script.WriteRawImage("/boot", "recovery.img")
    script.AppendExtra("""
set_stage("%(bcb_dev)s", "2/3");
reboot_now("%(bcb_dev)s", "");
else
""" % bcb_dev)

  # Verify the existing partitions.
  system_diff.WriteVerifyScript(script)
  if vendor_diff:
    vendor_diff.WriteVerifyScript(script)

  script.Comment("---- start making changes here ----")

  device_specific.IncrementalOTA_InstallBegin()

  system_diff.WriteScript(script, output_zip,
                          progress=0.8 if vendor_diff else 0.9)
  if vendor_diff:
    vendor_diff.WriteScript(script, output_zip, progress=0.1)

  if OPTIONS.two_step:
    common.ZipWriteStr(output_zip, "boot.img", target_boot.data)
    script.WriteRawImage("/boot", "boot.img")
    print("writing full boot image (forced by two-step mode)")

  if not OPTIONS.two_step:
    if updating_boot:
      if include_full_boot:
        print("boot image changed; including full.")
        script.Print("Installing boot image...")
        script.WriteRawImage("/boot", "boot.img")
      else:
        # Produce the boot image by applying a patch to the current
        # contents of the boot partition, and write it back to the
        # partition.
        print("boot image changed; including patch.")
        script.Print("Patching boot image...")
        script.ShowProgress(0.1, 10)
        script.ApplyPatch("%s:%s:%d:%s:%d:%s"
                          % (boot_type, boot_device,
                             source_boot.size, source_boot.sha1,
                             target_boot.size, target_boot.sha1),
                          "-",
                          target_boot.size, target_boot.sha1,
                          source_boot.sha1, "patch/boot.img.p")
    else:
      print("boot image unchanged; skipping.")

  # Do device-specific installation (eg, write radio image).
  device_specific.IncrementalOTA_InstallEnd()

  if OPTIONS.extra_script is not None:
    script.AppendExtra(OPTIONS.extra_script)

  if OPTIONS.wipe_user_data:
    script.Print("Erasing user data...")
    script.FormatPartition("/data")

  if OPTIONS.two_step:
    script.AppendExtra("""
set_stage("%(bcb_dev)s", "");
endif;
endif;
""" % bcb_dev)

  script.SetProgress(1)
  script.AddToZip(target_zip, output_zip, input_path=OPTIONS.updater_binary)
  WriteMetadata(metadata, output_zip)


class FileDifference(object):
  def __init__(self, partition, source_zip, target_zip, output_zip):
    self.deferred_patch_list = None
    print("Loading target...")
    self.target_data = target_data = LoadPartitionFiles(target_zip, partition)
    print("Loading source...")
    self.source_data = source_data = LoadPartitionFiles(source_zip, partition)

    self.verbatim_targets = verbatim_targets = []
    self.patch_list = patch_list = []
    diffs = []
    self.renames = renames = {}
    known_paths = set()
    largest_source_size = 0

    matching_file_cache = {}
    for fn, sf in source_data.items():
      assert fn == sf.name
      matching_file_cache["path:" + fn] = sf
      if fn in target_data.keys():
        AddToKnownPaths(fn, known_paths)
      # Only allow eligibility for filename/sha matching
      # if there isn't a perfect path match.
      if target_data.get(sf.name) is None:
        matching_file_cache["file:" + fn.split("/")[-1]] = sf
        matching_file_cache["sha:" + sf.sha1] = sf

    for fn in sorted(target_data.keys()):
      tf = target_data[fn]
      assert fn == tf.name
      sf = ClosestFileMatch(tf, matching_file_cache, renames)
      if sf is not None and sf.name != tf.name:
        print("File has moved from " + sf.name + " to " + tf.name)
        renames[sf.name] = tf

      if sf is None or fn in OPTIONS.require_verbatim:
        # This file should be included verbatim
        if fn in OPTIONS.prohibit_verbatim:
          raise common.ExternalError("\"%s\" must be sent verbatim" % (fn,))
        print("send", fn, "verbatim")
        tf.AddToZip(output_zip)
        verbatim_targets.append((fn, tf.size, tf.sha1))
        if fn in target_data.keys():
          AddToKnownPaths(fn, known_paths)
      elif tf.sha1 != sf.sha1:
        # File is different; consider sending as a patch
        diffs.append(common.Difference(tf, sf))
      else:
        # Target file data identical to source (may still be renamed)
        pass

    common.ComputeDifferences(diffs)

    for diff in diffs:
      tf, sf, d = diff.GetPatch()
      path = "/".join(tf.name.split("/")[:-1])
      if d is None or len(d) > tf.size * OPTIONS.patch_threshold or \
          path not in known_paths:
        # patch is almost as big as the file; don't bother patching
        # or a patch + rename cannot take place due to the target
        # directory not existing
        tf.AddToZip(output_zip)
        verbatim_targets.append((tf.name, tf.size, tf.sha1))
        if sf.name in renames:
          del renames[sf.name]
        AddToKnownPaths(tf.name, known_paths)
      else:
        common.ZipWriteStr(output_zip, "patch/" + sf.name + ".p", d)
        patch_list.append((tf, sf, tf.size, common.sha1(d).hexdigest()))
        largest_source_size = max(largest_source_size, sf.size)

    self.largest_source_size = largest_source_size

  def EmitVerification(self, script):
    so_far = 0
    for tf, sf, _, _ in self.patch_list:
      if tf.name != sf.name:
        script.SkipNextActionIfTargetExists(tf.name, tf.sha1)
      script.PatchCheck("/"+sf.name, tf.sha1, sf.sha1)
      so_far += sf.size
    return so_far

  def EmitExplicitTargetVerification(self, script):
    for fn, _, sha1 in self.verbatim_targets:
      if fn[-1] != "/":
        script.FileCheck("/"+fn, sha1)
    for tf, _, _, _ in self.patch_list:
      script.FileCheck(tf.name, tf.sha1)

  def RemoveUnneededFiles(self, script, extras=()):
    script.DeleteFiles(
        ["/" + i[0] for i in self.verbatim_targets] +
        ["/" + i for i in sorted(self.source_data)
         if i not in self.target_data and i not in self.renames] +
        list(extras))

  def TotalPatchSize(self):
    return sum(i[1].size for i in self.patch_list)

  def EmitPatches(self, script, total_patch_size, so_far):
    self.deferred_patch_list = deferred_patch_list = []
    for item in self.patch_list:
      tf, sf, _, _ = item
      if tf.name == "system/build.prop":
        deferred_patch_list.append(item)
        continue
      if sf.name != tf.name:
        script.SkipNextActionIfTargetExists(tf.name, tf.sha1)
      script.ApplyPatch("/" + sf.name, "-", tf.size, tf.sha1, sf.sha1,
                        "patch/" + sf.name + ".p")
      so_far += tf.size
      script.SetProgress(so_far / total_patch_size)
    return so_far

  def EmitDeferredPatches(self, script):
    for item in self.deferred_patch_list:
      tf, sf, _, _ = item
      script.ApplyPatch("/"+sf.name, "-", tf.size, tf.sha1, sf.sha1,
                        "patch/" + sf.name + ".p")
    script.SetPermissions("/system/build.prop", 0, 0, 0o644, None, None)

  def EmitRenames(self, script):
    if len(self.renames) > 0:
      script.Print("Renaming files...")
      for src, tgt in self.renames.items():
        print("Renaming " + src + " to " + tgt.name)
        script.RenameFile(src, tgt.name)


def WriteIncrementalOTAPackage(target_zip, source_zip, output_zip):
  target_has_recovery_patch = HasRecoveryPatch(target_zip)
  source_has_recovery_patch = HasRecoveryPatch(source_zip)

  if (OPTIONS.block_based and
      target_has_recovery_patch and
      source_has_recovery_patch):
    return WriteBlockIncrementalOTAPackage(target_zip, source_zip, output_zip)

  source_version = OPTIONS.source_info_dict["recovery_api_version"]
  target_version = OPTIONS.target_info_dict["recovery_api_version"]

  if source_version == 0:
    print ("WARNING: generating edify script for a source that "
           "can't install it.")
  script = edify_generator.EdifyGenerator(
      source_version, OPTIONS.target_info_dict,
      fstab=OPTIONS.source_info_dict["fstab"])

  oem_props = OPTIONS.info_dict.get("oem_fingerprint_properties")
  recovery_mount_options = OPTIONS.source_info_dict.get(
      "recovery_mount_options")
  oem_dict = None
  if oem_props is not None and len(oem_props) > 0:
    if OPTIONS.oem_source is None:
      raise common.ExternalError("OEM source required for this build")
    script.Mount("/oem", recovery_mount_options)
    oem_dict = common.LoadDictionaryFromLines(
        open(OPTIONS.oem_source).readlines())

  if OPTIONS.override_prop:
    metadata = {"post-timestamp": GetBuildProp("ro.build.date.utc",
                                               OPTIONS.target_info_dict),
                }
  else:
    metadata = {"pre-device": GetOemProperty("ro.product.device", oem_props, oem_dict,
                                           OPTIONS.source_info_dict),
                "post-timestamp": GetBuildProp("ro.build.date.utc",
                                               OPTIONS.target_info_dict),
                }

  device_specific = common.DeviceSpecificParams(
      source_zip=source_zip,
      source_version=source_version,
      target_zip=target_zip,
      input_zip=target_zip,
      target_version=target_version,
      input_version=target_version,
      output_zip=output_zip,
      script=script,
      metadata=metadata,
      info_dict=OPTIONS.source_info_dict)

  system_diff = FileDifference("system", source_zip, target_zip, output_zip)
  script.Mount("/system", recovery_mount_options)
  if HasVendorPartition(target_zip):
    vendor_diff = FileDifference("vendor", source_zip, target_zip, output_zip)
    script.Mount("/vendor", recovery_mount_options)
  else:
    vendor_diff = None

  if not OPTIONS.override_prop:
    target_fp = CalculateFingerprint(oem_props, oem_dict, OPTIONS.target_info_dict)
    source_fp = CalculateFingerprint(oem_props, oem_dict, OPTIONS.source_info_dict)

    if oem_props is None:
      script.AssertSomeFingerprint(source_fp, target_fp)
    else:
      script.AssertSomeThumbprint(
          GetBuildProp("ro.build.thumbprint", OPTIONS.target_info_dict),
          GetBuildProp("ro.build.thumbprint", OPTIONS.source_info_dict))

    metadata["pre-build"] = source_fp
    metadata["post-build"] = target_fp

  source_boot = common.GetBootableImage(
      "/tmp/boot.img", "boot.img", OPTIONS.source_tmp, "BOOT",
      OPTIONS.source_info_dict)
  target_boot = common.GetBootableImage(
      "/tmp/boot.img", "boot.img", OPTIONS.target_tmp, "BOOT")
  updating_boot = (not OPTIONS.two_step and
                   (source_boot.data != target_boot.data))

  source_recovery = common.GetBootableImage(
      "/tmp/recovery.img", "recovery.img", OPTIONS.source_tmp, "RECOVERY",
      OPTIONS.source_info_dict)
  target_recovery = common.GetBootableImage(
      "/tmp/recovery.img", "recovery.img", OPTIONS.target_tmp, "RECOVERY")
  updating_recovery = (source_recovery.data != target_recovery.data)

  # Here's how we divide up the progress bar:
  #  0.1 for verifying the start state (PatchCheck calls)
  #  0.8 for applying patches (ApplyPatch calls)
  #  0.1 for unpacking verbatim files, symlinking, and doing the
  #      device-specific commands.

  AppendAssertions(script, OPTIONS.target_info_dict, oem_dict)
  device_specific.IncrementalOTA_Assertions()

  # Two-step incremental package strategy (in chronological order,
  # which is *not* the order in which the generated script has
  # things):
  #
  # if stage is not "2/3" or "3/3":
  #    do verification on current system
  #    write recovery image to boot partition
  #    set stage to "2/3"
  #    reboot to boot partition and restart recovery
  # else if stage is "2/3":
  #    write recovery image to recovery partition
  #    set stage to "3/3"
  #    reboot to recovery partition and restart recovery
  # else:
  #    (stage must be "3/3")
  #    perform update:
  #       patch system files, etc.
  #       force full install of new boot image
  #       set up system to update recovery partition on first boot
  #    complete script normally
  #    (allow recovery to mark itself finished and reboot)

  if OPTIONS.two_step:
    if not OPTIONS.source_info_dict.get("multistage_support", None):
      assert False, "two-step packages not supported by this build"
    fs = OPTIONS.source_info_dict["fstab"]["/misc"]
    assert fs.fs_type.upper() == "EMMC", \
        "two-step packages only supported on devices with EMMC /misc partitions"
    bcb_dev = {"bcb_dev": fs.device}
    common.ZipWriteStr(output_zip, "recovery.img", target_recovery.data)
    script.AppendExtra("""
if get_stage("%(bcb_dev)s") == "2/3" then
""" % bcb_dev)
    script.AppendExtra("sleep(20);\n")
    script.WriteRawImage("/recovery", "recovery.img")
    script.AppendExtra("""
set_stage("%(bcb_dev)s", "3/3");
reboot_now("%(bcb_dev)s", "recovery");
else if get_stage("%(bcb_dev)s") != "3/3" then
""" % bcb_dev)

  # Dump fingerprints
  script.Print("Source: %s" % source_fp)
  script.Print("Target: %s" % target_fp)

  script.Print("Verifying current system...")

  device_specific.IncrementalOTA_VerifyBegin()

  script.ShowProgress(0.1, 0)
  so_far = system_diff.EmitVerification(script)
  if vendor_diff:
    so_far += vendor_diff.EmitVerification(script)

  if updating_boot:
    d = common.Difference(target_boot, source_boot)
    _, _, d = d.ComputePatch()
    print("boot      target: %d  source: %d  diff: %d" % (
        target_boot.size, source_boot.size, len(d)))

    common.ZipWriteStr(output_zip, "patch/boot.img.p", d)

    boot_type, boot_device = common.GetTypeAndDevice(
        "/boot", OPTIONS.source_info_dict)

    script.PatchCheck("%s:%s:%d:%s:%d:%s" %
                      (boot_type, boot_device,
                       source_boot.size, source_boot.sha1,
                       target_boot.size, target_boot.sha1))
    so_far += source_boot.size

  size = []
  if system_diff.patch_list:
    size.append(system_diff.largest_source_size)
  if vendor_diff:
    if vendor_diff.patch_list:
      size.append(vendor_diff.largest_source_size)
  if size or updating_recovery or updating_boot:
    script.CacheFreeSpaceCheck(max(size))

  device_specific.IncrementalOTA_VerifyEnd()

  if OPTIONS.two_step:
    script.WriteRawImage("/boot", "recovery.img")
    script.AppendExtra("""
set_stage("%(bcb_dev)s", "2/3");
reboot_now("%(bcb_dev)s", "");
else
""" % bcb_dev)

  script.Comment("---- start making changes here ----")

  device_specific.IncrementalOTA_InstallBegin()

  if OPTIONS.two_step:
    common.ZipWriteStr(output_zip, "boot.img", target_boot.data)
    script.WriteRawImage("/boot", "boot.img")
    print("writing full boot image (forced by two-step mode)")

  script.Print("Removing unneeded files...")
  system_diff.RemoveUnneededFiles(script, ("/system/recovery.img",))
  if vendor_diff:
    vendor_diff.RemoveUnneededFiles(script)

  script.ShowProgress(0.8, 0)
  total_patch_size = 1.0 + system_diff.TotalPatchSize()
  if vendor_diff:
    total_patch_size += vendor_diff.TotalPatchSize()
  if updating_boot:
    total_patch_size += target_boot.size

  script.Print("Patching system files...")
  so_far = system_diff.EmitPatches(script, total_patch_size, 0)
  if vendor_diff:
    script.Print("Patching vendor files...")
    so_far = vendor_diff.EmitPatches(script, total_patch_size, so_far)

  if not OPTIONS.two_step:
    if updating_boot:
      # Produce the boot image by applying a patch to the current
      # contents of the boot partition, and write it back to the
      # partition.
      script.Print("Patching boot image...")
      script.ApplyPatch("%s:%s:%d:%s:%d:%s"
                        % (boot_type, boot_device,
                           source_boot.size, source_boot.sha1,
                           target_boot.size, target_boot.sha1),
                        "-",
                        target_boot.size, target_boot.sha1,
                        source_boot.sha1, "patch/boot.img.p")
      so_far += target_boot.size
      script.SetProgress(so_far / total_patch_size)
      print("boot image changed; including.")
    else:
      print("boot image unchanged; skipping.")

  system_items = ItemSet("system", "META/filesystem_config.txt")
  if vendor_diff:
    vendor_items = ItemSet("vendor", "META/vendor_filesystem_config.txt")

  if updating_recovery:
    # Recovery is generated as a patch using both the boot image
    # (which contains the same linux kernel as recovery) and the file
    # /system/etc/recovery-resource.dat (which contains all the images
    # used in the recovery UI) as sources.  This lets us minimize the
    # size of the patch, which must be included in every OTA package.
    #
    # For older builds where recovery-resource.dat is not present, we
    # use only the boot image as the source.

    if not target_has_recovery_patch:
      def output_sink(fn, data):
        common.ZipWriteStr(output_zip, "recovery/" + fn, data)
        system_items.Get("system/" + fn)

      common.MakeRecoveryPatch(OPTIONS.target_tmp, output_sink,
                               target_recovery, target_boot)
      script.DeleteFiles(["/system/recovery-from-boot.p",
                          "/system/etc/install-recovery.sh"])
    print("recovery image changed; including as patch from boot.")
  else:
    print("recovery image unchanged; skipping.")

  script.ShowProgress(0.1, 10)

  target_symlinks = CopyPartitionFiles(system_items, target_zip, None)
  if vendor_diff:
    target_symlinks.extend(CopyPartitionFiles(vendor_items, target_zip, None))

  temp_script = script.MakeTemporary()
  system_items.GetMetadata(target_zip)
  system_items.Get("system").SetPermissions(temp_script)
  if vendor_diff:
    vendor_items.GetMetadata(target_zip)
    vendor_items.Get("vendor").SetPermissions(temp_script)

  # Note that this call will mess up the trees of Items, so make sure
  # we're done with them.
  source_symlinks = CopyPartitionFiles(system_items, source_zip, None)
  if vendor_diff:
    source_symlinks.extend(CopyPartitionFiles(vendor_items, source_zip, None))

  target_symlinks_d = dict([(i[1], i[0]) for i in target_symlinks])
  source_symlinks_d = dict([(i[1], i[0]) for i in source_symlinks])

  # Delete all the symlinks in source that aren't in target.  This
  # needs to happen before verbatim files are unpacked, in case a
  # symlink in the source is replaced by a real file in the target.

  # If a symlink in the source will be replaced by a regular file, we cannot
  # delete the symlink/file in case the package gets applied again. For such
  # a symlink, we prepend a sha1_check() to detect if it has been updated.
  # (Bug: 23646151)
  replaced_symlinks = dict()
  if system_diff:
    for i in system_diff.verbatim_targets:
      replaced_symlinks["/%s" % (i[0],)] = i[2]
  if vendor_diff:
    for i in vendor_diff.verbatim_targets:
      replaced_symlinks["/%s" % (i[0],)] = i[2]

  if system_diff:
    for tf in system_diff.renames.values():
      replaced_symlinks["/%s" % (tf.name,)] = tf.sha1
  if vendor_diff:
    for tf in vendor_diff.renames.values():
      replaced_symlinks["/%s" % (tf.name,)] = tf.sha1

  always_delete = []
  may_delete = []
  for dest, link in source_symlinks:
    if link not in target_symlinks_d:
      if link in replaced_symlinks:
        may_delete.append((link, replaced_symlinks[link]))
      else:
        always_delete.append(link)
  script.DeleteFiles(always_delete)
  script.DeleteFilesIfNotMatching(may_delete)

  if system_diff.verbatim_targets:
    script.Print("Unpacking new system files...")
    script.UnpackPackageDir("system", "/system")
  if vendor_diff and vendor_diff.verbatim_targets:
    script.Print("Unpacking new vendor files...")
    script.UnpackPackageDir("vendor", "/vendor")

  if updating_recovery and not target_has_recovery_patch:
    script.Print("Unpacking new recovery...")
    script.UnpackPackageDir("recovery", "/system")

  system_diff.EmitRenames(script)
  if vendor_diff:
    vendor_diff.EmitRenames(script)

  script.Print("Symlinks and permissions...")

  # Create all the symlinks that don't already exist, or point to
  # somewhere different than what we want.  Delete each symlink before
  # creating it, since the 'symlink' command won't overwrite.
  to_create = []
  for dest, link in target_symlinks:
    if link in source_symlinks_d:
      if dest != source_symlinks_d[link]:
        to_create.append((dest, link))
    else:
      to_create.append((dest, link))
  script.DeleteFiles([i[1] for i in to_create])
  script.MakeSymlinks(to_create)

  # Now that the symlinks are created, we can set all the
  # permissions.
  script.AppendScript(temp_script)

  # Do device-specific installation (eg, write radio image).
  device_specific.IncrementalOTA_InstallEnd()

  if OPTIONS.extra_script is not None:
    script.AppendExtra(OPTIONS.extra_script)

  # Patch the build.prop file last, so if something fails but the
  # device can still come up, it appears to be the old build and will
  # get set the OTA package again to retry.
  script.Print("Patching remaining system files...")
  system_diff.EmitDeferredPatches(script)

  if OPTIONS.wipe_user_data:
    script.Print("Erasing user data...")
    script.FormatPartition("/data")

  if OPTIONS.two_step:
    script.AppendExtra("""
set_stage("%(bcb_dev)s", "");
endif;
endif;
""" % bcb_dev)

  if OPTIONS.verify and system_diff:
    script.Print("Remounting and verifying system partition files...")
    script.Unmount("/system")
    script.Mount("/system")
    system_diff.EmitExplicitTargetVerification(script)

  if OPTIONS.verify and vendor_diff:
    script.Print("Remounting and verifying vendor partition files...")
    script.Unmount("/vendor")
    script.Mount("/vendor")
    vendor_diff.EmitExplicitTargetVerification(script)
  script.AddToZip(target_zip, output_zip, input_path=OPTIONS.updater_binary)

  WriteMetadata(metadata, output_zip)

def main(argv):

  def option_handler(o, a):
    if o == "--board_config":
      pass   # deprecated
    elif o in ("-k", "--package_key"):
      OPTIONS.package_key = a
    elif o in ("-i", "--incremental_from"):
      OPTIONS.incremental_source = a
    elif o == "--full_radio":
      OPTIONS.full_radio = True
    elif o == "--full_bootloader":
      OPTIONS.full_bootloader = True
    elif o in ("-w", "--wipe_user_data"):
      OPTIONS.wipe_user_data = True
    elif o in ("-n", "--no_prereq"):
      OPTIONS.omit_prereq = True
    elif o in ("-o", "--oem_settings"):
      OPTIONS.oem_source = a
    elif o in ("-e", "--extra_script"):
      OPTIONS.extra_script = a
    elif o in ("-a", "--aslr_mode"):
      if a in ("on", "On", "true", "True", "yes", "Yes"):
        OPTIONS.aslr_mode = True
      else:
        OPTIONS.aslr_mode = False
    elif o in ("-t", "--worker_threads"):
      if a.isdigit():
        OPTIONS.worker_threads = int(a)
      else:
        raise ValueError("Cannot parse value %r for option %r - only "
                         "integers are allowed." % (a, o))
    elif o in ("-2", "--two_step"):
      OPTIONS.two_step = True
    elif o == "--no_signing":
      OPTIONS.no_signing = True
    elif o == "--verify":
      OPTIONS.verify = True
    elif o == "--block":
      OPTIONS.block_based = True
    elif o in ("-b", "--binary",):
      OPTIONS.updater_binary = a
    elif o in ("--no_fallback_to_full",):
      OPTIONS.fallback_to_full = False
    elif o == "--stash_threshold":
      try:
        OPTIONS.stash_threshold = float(a)
      except ValueError:
        raise ValueError("Cannot parse value %r for option %r - expecting "
                         "a float" % (a, o))
    elif o in ("--backup",):
      OPTIONS.backuptool = bool(a.lower() == 'true')
    elif o in ("--override_device",):
      OPTIONS.override_device = a
    elif o in ("--override_prop",):
      OPTIONS.override_prop = bool(a.lower() == 'true')
    else:
      return False
    return True

  args = common.ParseOptions(argv, __doc__,
                             extra_opts="b:k:i:d:wne:t:a:2o:",
                             extra_long_opts=[
                                 "board_config=",
                                 "package_key=",
                                 "incremental_from=",
                                 "full_radio",
                                 "full_bootloader",
                                 "wipe_user_data",
                                 "no_prereq",
                                 "extra_script=",
                                 "worker_threads=",
                                 "aslr_mode=",
                                 "two_step",
                                 "no_signing",
                                 "block",
                                 "binary=",
                                 "oem_settings=",
                                 "verify",
                                 "no_fallback_to_full",
                                 "stash_threshold=",
                                 "backup=",
                                 "override_device=",
                                 "override_prop="
                             ], extra_option_handler=option_handler)

  if len(args) != 2:
    common.Usage(__doc__)
    sys.exit(1)

  if OPTIONS.extra_script is not None:
    OPTIONS.extra_script = open(OPTIONS.extra_script).read()

  print("unzipping target target-files...")
  OPTIONS.input_tmp, input_zip = common.UnzipTemp(args[0])

  OPTIONS.target_tmp = OPTIONS.input_tmp
  OPTIONS.info_dict = common.LoadInfoDict(input_zip)

  # If this image was originally labelled with SELinux contexts, make sure we
  # also apply the labels in our new image. During building, the "file_contexts"
  # is in the out/ directory tree, but for repacking from target-files.zip it's
  # in the root directory of the ramdisk.
  if "selinux_fc" in OPTIONS.info_dict:
    OPTIONS.info_dict["selinux_fc"] = os.path.join(
        OPTIONS.input_tmp, "BOOT", "RAMDISK", "file_contexts")

  if OPTIONS.verbose:
    print("--- target info ---")
    common.DumpInfoDict(OPTIONS.info_dict)

  # If the caller explicitly specified the device-specific extensions
  # path via -s/--device_specific, use that.  Otherwise, use
  # META/releasetools.py if it is present in the target target_files.
  # Otherwise, take the path of the file from 'tool_extensions' in the
  # info dict and look for that in the local filesystem, relative to
  # the current directory.

  if OPTIONS.device_specific is None:
    from_input = os.path.join(OPTIONS.input_tmp, "META", "releasetools.py")
    if os.path.exists(from_input):
      print("(using device-specific extensions from target_files)")
      OPTIONS.device_specific = from_input
    else:
      OPTIONS.device_specific = OPTIONS.info_dict.get("tool_extensions", None)

  if OPTIONS.device_specific is not None:
    OPTIONS.device_specific = os.path.abspath(OPTIONS.device_specific)

  while True:

    if OPTIONS.no_signing:
      if os.path.exists(args[1]):
        os.unlink(args[1])
      output_zip = zipfile.ZipFile(args[1], "w",
                                   compression=zipfile.ZIP_DEFLATED)
    else:
      temp_zip_file = tempfile.NamedTemporaryFile()
      output_zip = zipfile.ZipFile(temp_zip_file, "w",
                                   compression=zipfile.ZIP_DEFLATED)

    cache_size = OPTIONS.info_dict.get("cache_size", None)
    if cache_size is None:
      print("--- can't determine the cache partition size ---")
    OPTIONS.cache_size = cache_size

    if OPTIONS.incremental_source is None:
      WriteFullOTAPackage(input_zip, output_zip)
      if OPTIONS.package_key is None:
        OPTIONS.package_key = OPTIONS.info_dict.get(
            "default_system_dev_certificate",
            "build/target/product/security/testkey")
      common.ZipClose(output_zip)
      break

    else:
      print("unzipping source target-files...")
      OPTIONS.source_tmp, source_zip = common.UnzipTemp(
          OPTIONS.incremental_source)
      OPTIONS.target_info_dict = OPTIONS.info_dict
      OPTIONS.source_info_dict = common.LoadInfoDict(source_zip)
      if "selinux_fc" in OPTIONS.source_info_dict:
        OPTIONS.source_info_dict["selinux_fc"] = os.path.join(
            OPTIONS.source_tmp, "BOOT", "RAMDISK", "file_contexts")
      if OPTIONS.package_key is None:
        OPTIONS.package_key = OPTIONS.source_info_dict.get(
            "default_system_dev_certificate",
            "build/target/product/security/testkey")
      if OPTIONS.verbose:
        print("--- source info ---")
        common.DumpInfoDict(OPTIONS.source_info_dict)
      try:
        WriteIncrementalOTAPackage(input_zip, source_zip, output_zip)
        common.ZipClose(output_zip)
        break
      except ValueError:
        if not OPTIONS.fallback_to_full:
          raise
        print("--- failed to build incremental; falling back to full ---")
        OPTIONS.incremental_source = None
        common.ZipClose(output_zip)

  if not OPTIONS.no_signing:
    SignOutput(temp_zip_file.name, args[1])
    temp_zip_file.close()

  print("done.")


if __name__ == '__main__':
  try:
    common.CloseInheritedPipes()
    main(sys.argv[1:])
  except common.ExternalError as e:
    print()
    print("   ERROR: %s" % e)
    print()
    sys.exit(1)
  finally:
    common.Cleanup()