File: easy_install.py

package info (click to toggle)
python-setuptools 33.1.1-1
  • links: PTS
  • area: main
  • in suites: stretch
  • size: 2,848 kB
  • ctags: 3,409
  • sloc: python: 19,087; ansic: 195; makefile: 97; xml: 14
file content (2347 lines) | stat: -rwxr-xr-x 88,319 bytes parent folder | download | duplicates (3)
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
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
#!/usr/bin/env python
"""
Easy Install
------------

A tool for doing automatic download/extract/build of distutils-based Python
packages.  For detailed documentation, see the accompanying EasyInstall.txt
file, or visit the `EasyInstall home page`__.

__ https://setuptools.readthedocs.io/en/latest/easy_install.html

"""

from glob import glob
from distutils.util import get_platform
from distutils.util import convert_path, subst_vars
from distutils.errors import (
    DistutilsArgError, DistutilsOptionError,
    DistutilsError, DistutilsPlatformError,
)
from distutils.command.install import INSTALL_SCHEMES, SCHEME_KEYS
from distutils import log, dir_util
from distutils.command.build_scripts import first_line_re
from distutils.spawn import find_executable
import sys
import os
import zipimport
import shutil
import tempfile
import zipfile
import re
import stat
import random
import textwrap
import warnings
import site
import struct
import contextlib
import subprocess
import shlex
import io

from setuptools.extern import six
from setuptools.extern.six.moves import configparser, map

from setuptools import Command
from setuptools.sandbox import run_setup
from setuptools.py31compat import get_path, get_config_vars
from setuptools.py27compat import rmtree_safe
from setuptools.command import setopt
from setuptools.archive_util import unpack_archive
from setuptools.package_index import (
    PackageIndex, parse_requirement_arg, URL_SCHEME,
)
from setuptools.command import bdist_egg, egg_info
from pkg_resources import (
    yield_lines, normalize_path, resource_string, ensure_directory,
    get_distribution, find_distributions, Environment, Requirement,
    Distribution, PathMetadata, EggMetadata, WorkingSet, DistributionNotFound,
    VersionConflict, DEVELOP_DIST,
)
import pkg_resources

# Turn on PEP440Warnings
warnings.filterwarnings("default", category=pkg_resources.PEP440Warning)

__all__ = [
    'samefile', 'easy_install', 'PthDistributions', 'extract_wininst_cfg',
    'main', 'get_exe_prefixes',
]


def is_64bit():
    return struct.calcsize("P") == 8


def samefile(p1, p2):
    """
    Determine if two paths reference the same file.

    Augments os.path.samefile to work on Windows and
    suppresses errors if the path doesn't exist.
    """
    both_exist = os.path.exists(p1) and os.path.exists(p2)
    use_samefile = hasattr(os.path, 'samefile') and both_exist
    if use_samefile:
        return os.path.samefile(p1, p2)
    norm_p1 = os.path.normpath(os.path.normcase(p1))
    norm_p2 = os.path.normpath(os.path.normcase(p2))
    return norm_p1 == norm_p2


if six.PY2:

    def _to_ascii(s):
        return s

    def isascii(s):
        try:
            six.text_type(s, 'ascii')
            return True
        except UnicodeError:
            return False
else:

    def _to_ascii(s):
        return s.encode('ascii')

    def isascii(s):
        try:
            s.encode('ascii')
            return True
        except UnicodeError:
            return False


_one_liner = lambda text: textwrap.dedent(text).strip().replace('\n', '; ')


class easy_install(Command):
    """Manage a download/build/install process"""
    description = "Find/get/install Python packages"
    command_consumes_arguments = True

    user_options = [
        ('prefix=', None, "installation prefix"),
        ("zip-ok", "z", "install package as a zipfile"),
        ("multi-version", "m", "make apps have to require() a version"),
        ("upgrade", "U", "force upgrade (searches PyPI for latest versions)"),
        ("install-dir=", "d", "install package to DIR"),
        ("script-dir=", "s", "install scripts to DIR"),
        ("exclude-scripts", "x", "Don't install scripts"),
        ("always-copy", "a", "Copy all needed packages to install dir"),
        ("index-url=", "i", "base URL of Python Package Index"),
        ("find-links=", "f", "additional URL(s) to search for packages"),
        ("build-directory=", "b",
         "download/extract/build in DIR; keep the results"),
        ('optimize=', 'O',
         "also compile with optimization: -O1 for \"python -O\", "
         "-O2 for \"python -OO\", and -O0 to disable [default: -O0]"),
        ('record=', None,
         "filename in which to record list of installed files"),
        ('always-unzip', 'Z', "don't install as a zipfile, no matter what"),
        ('site-dirs=', 'S', "list of directories where .pth files work"),
        ('editable', 'e', "Install specified packages in editable form"),
        ('no-deps', 'N', "don't install dependencies"),
        ('allow-hosts=', 'H', "pattern(s) that hostnames must match"),
        ('local-snapshots-ok', 'l',
         "allow building eggs from local checkouts"),
        ('version', None, "print version information and exit"),
        ('install-layout=', None, "installation layout to choose (known values: deb)"),
        ('force-installation-into-system-dir', '0', "force installation into /usr"),
        ('no-find-links', None,
         "Don't load find-links defined in packages being installed")
    ]
    boolean_options = [
        'zip-ok', 'multi-version', 'exclude-scripts', 'upgrade', 'always-copy',
        'editable',
        'no-deps', 'local-snapshots-ok', 'version', 'force-installation-into-system-dir'
    ]

    if site.ENABLE_USER_SITE:
        help_msg = "install in user site-package '%s'" % site.USER_SITE
        user_options.append(('user', None, help_msg))
        boolean_options.append('user')

    negative_opt = {'always-unzip': 'zip-ok'}
    create_index = PackageIndex

    def initialize_options(self):
        # the --user option seems to be an opt-in one,
        # so the default should be False.
        self.user = 0
        self.zip_ok = self.local_snapshots_ok = None
        self.install_dir = self.script_dir = self.exclude_scripts = None
        self.index_url = None
        self.find_links = None
        self.build_directory = None
        self.args = None
        self.optimize = self.record = None
        self.upgrade = self.always_copy = self.multi_version = None
        self.editable = self.no_deps = self.allow_hosts = None
        self.root = self.prefix = self.no_report = None
        self.version = None
        self.install_purelib = None  # for pure module distributions
        self.install_platlib = None  # non-pure (dists w/ extensions)
        self.install_headers = None  # for C/C++ headers
        self.install_lib = None  # set to either purelib or platlib
        self.install_scripts = None
        self.install_data = None
        self.install_base = None
        self.install_platbase = None
        if site.ENABLE_USER_SITE:
            self.install_userbase = site.USER_BASE
            self.install_usersite = site.USER_SITE
        else:
            self.install_userbase = None
            self.install_usersite = None
        self.no_find_links = None

        # Options not specifiable via command line
        self.package_index = None
        self.pth_file = self.always_copy_from = None
        self.site_dirs = None
        self.installed_projects = {}
        self.sitepy_installed = False
        # enable custom installation, known values: deb
        self.install_layout = None
        self.force_installation_into_system_dir = None
        self.multiarch = None

        # Always read easy_install options, even if we are subclassed, or have
        # an independent instance created.  This ensures that defaults will
        # always come from the standard configuration file(s)' "easy_install"
        # section, even if this is a "develop" or "install" command, or some
        # other embedding.
        self._dry_run = None
        self.verbose = self.distribution.verbose
        self.distribution._set_command_options(
            self, self.distribution.get_option_dict('easy_install')
        )

    def delete_blockers(self, blockers):
        extant_blockers = (
            filename for filename in blockers
            if os.path.exists(filename) or os.path.islink(filename)
        )
        list(map(self._delete_path, extant_blockers))

    def _delete_path(self, path):
        log.info("Deleting %s", path)
        if self.dry_run:
            return

        is_tree = os.path.isdir(path) and not os.path.islink(path)
        remover = rmtree if is_tree else os.unlink
        remover(path)

    @staticmethod
    def _render_version():
        """
        Render the Setuptools version and installation details, then exit.
        """
        ver = sys.version[:3]
        dist = get_distribution('setuptools')
        tmpl = 'setuptools {dist.version} from {dist.location} (Python {ver})'
        print(tmpl.format(**locals()))
        raise SystemExit()

    def finalize_options(self):
        self.version and self._render_version()

        py_version = sys.version.split()[0]
        prefix, exec_prefix = get_config_vars('prefix', 'exec_prefix')

        self.config_vars = {
            'dist_name': self.distribution.get_name(),
            'dist_version': self.distribution.get_version(),
            'dist_fullname': self.distribution.get_fullname(),
            'py_version': py_version,
            'py_version_short': py_version[0:3],
            'py_version_nodot': py_version[0] + py_version[2],
            'sys_prefix': prefix,
            'prefix': prefix,
            'sys_exec_prefix': exec_prefix,
            'exec_prefix': exec_prefix,
            # Only python 3.2+ has abiflags
            'abiflags': getattr(sys, 'abiflags', ''),
        }

        if site.ENABLE_USER_SITE:
            self.config_vars['userbase'] = self.install_userbase
            self.config_vars['usersite'] = self.install_usersite

        self._fix_install_dir_for_user_site()

        self.expand_basedirs()
        self.expand_dirs()

        if self.install_layout:
            if not self.install_layout.lower() in ['deb']:
                raise DistutilsOptionError("unknown value for --install-layout")
            self.install_layout = self.install_layout.lower()

            import sysconfig
            if sys.version_info[:2] >= (3, 3):
                self.multiarch = sysconfig.get_config_var('MULTIARCH')

        self._expand(
            'install_dir', 'script_dir', 'build_directory',
            'site_dirs',
        )
        # If a non-default installation directory was specified, default the
        # script directory to match it.
        if self.script_dir is None:
            self.script_dir = self.install_dir

        if self.no_find_links is None:
            self.no_find_links = False

        # Let install_dir get set by install_lib command, which in turn
        # gets its info from the install command, and takes into account
        # --prefix and --home and all that other crud.
        self.set_undefined_options(
            'install_lib', ('install_dir', 'install_dir')
        )
        # Likewise, set default script_dir from 'install_scripts.install_dir'
        self.set_undefined_options(
            'install_scripts', ('install_dir', 'script_dir')
        )

        if self.user and self.install_purelib:
            self.install_dir = self.install_purelib
            self.script_dir = self.install_scripts

        if self.prefix == '/usr' and not self.force_installation_into_system_dir:
            raise DistutilsOptionError("""installation into /usr

Trying to install into the system managed parts of the file system. Please
consider to install to another location, or use the option
--force-installation-into-system-dir to overwrite this warning.
""")

        # default --record from the install command
        self.set_undefined_options('install', ('record', 'record'))
        # Should this be moved to the if statement below? It's not used
        # elsewhere
        normpath = map(normalize_path, sys.path)
        self.all_site_dirs = get_site_dirs()
        if self.site_dirs is not None:
            site_dirs = [
                os.path.expanduser(s.strip()) for s in
                self.site_dirs.split(',')
            ]
            for d in site_dirs:
                if not os.path.isdir(d):
                    log.warn("%s (in --site-dirs) does not exist", d)
                elif normalize_path(d) not in normpath:
                    raise DistutilsOptionError(
                        d + " (in --site-dirs) is not on sys.path"
                    )
                else:
                    self.all_site_dirs.append(normalize_path(d))
        if not self.editable:
            self.check_site_dir()
        self.index_url = self.index_url or "https://pypi.python.org/simple"
        self.shadow_path = self.all_site_dirs[:]
        for path_item in self.install_dir, normalize_path(self.script_dir):
            if path_item not in self.shadow_path:
                self.shadow_path.insert(0, path_item)

        if self.allow_hosts is not None:
            hosts = [s.strip() for s in self.allow_hosts.split(',')]
        else:
            hosts = ['*']
        if self.package_index is None:
            self.package_index = self.create_index(
                self.index_url, search_path=self.shadow_path, hosts=hosts,
            )
        self.local_index = Environment(self.shadow_path + sys.path)

        if self.find_links is not None:
            if isinstance(self.find_links, six.string_types):
                self.find_links = self.find_links.split()
        else:
            self.find_links = []
        if self.local_snapshots_ok:
            self.package_index.scan_egg_links(self.shadow_path + sys.path)
        if not self.no_find_links:
            self.package_index.add_find_links(self.find_links)
        self.set_undefined_options('install_lib', ('optimize', 'optimize'))
        if not isinstance(self.optimize, int):
            try:
                self.optimize = int(self.optimize)
                if not (0 <= self.optimize <= 2):
                    raise ValueError
            except ValueError:
                raise DistutilsOptionError("--optimize must be 0, 1, or 2")

        if self.editable and not self.build_directory:
            raise DistutilsArgError(
                "Must specify a build directory (-b) when using --editable"
            )
        if not self.args:
            raise DistutilsArgError(
                "No urls, filenames, or requirements specified (see --help)")

        self.outputs = []

    def _fix_install_dir_for_user_site(self):
        """
        Fix the install_dir if "--user" was used.
        """
        if not self.user or not site.ENABLE_USER_SITE:
            return

        self.create_home_path()
        if self.install_userbase is None:
            msg = "User base directory is not specified"
            raise DistutilsPlatformError(msg)
        self.install_base = self.install_platbase = self.install_userbase
        scheme_name = os.name.replace('posix', 'unix') + '_user'
        self.select_scheme(scheme_name)

    def _expand_attrs(self, attrs):
        for attr in attrs:
            val = getattr(self, attr)
            if val is not None:
                if os.name == 'posix' or os.name == 'nt':
                    val = os.path.expanduser(val)
                val = subst_vars(val, self.config_vars)
                setattr(self, attr, val)

    def expand_basedirs(self):
        """Calls `os.path.expanduser` on install_base, install_platbase and
        root."""
        self._expand_attrs(['install_base', 'install_platbase', 'root'])

    def expand_dirs(self):
        """Calls `os.path.expanduser` on install dirs."""
        dirs = [
            'install_purelib',
            'install_platlib',
            'install_lib',
            'install_headers',
            'install_scripts',
            'install_data',
        ]
        self._expand_attrs(dirs)

    def run(self):
        if self.verbose != self.distribution.verbose:
            log.set_verbosity(self.verbose)
        try:
            for spec in self.args:
                self.easy_install(spec, not self.no_deps)
            if self.record:
                outputs = list(sorted(self.outputs))
                if self.root:  # strip any package prefix
                    root_len = len(self.root)
                    for counter in range(len(outputs)):
                        outputs[counter] = outputs[counter][root_len:]
                from distutils import file_util

                self.execute(
                    file_util.write_file, (self.record, outputs),
                    "writing list of installed files to '%s'" %
                    self.record
                )
            self.warn_deprecated_options()
        finally:
            log.set_verbosity(self.distribution.verbose)

    def pseudo_tempname(self):
        """Return a pseudo-tempname base in the install directory.
        This code is intentionally naive; if a malicious party can write to
        the target directory you're already in deep doodoo.
        """
        try:
            pid = os.getpid()
        except Exception:
            pid = random.randint(0, sys.maxsize)
        return os.path.join(self.install_dir, "test-easy-install-%s" % pid)

    def warn_deprecated_options(self):
        pass

    def check_site_dir(self):
        """Verify that self.install_dir is .pth-capable dir, if needed"""

        instdir = normalize_path(self.install_dir)
        pth_file = os.path.join(instdir, 'easy-install.pth')

        # Is it a configured, PYTHONPATH, implicit, or explicit site dir?
        is_site_dir = instdir in self.all_site_dirs

        if not is_site_dir and not self.multi_version:
            # No?  Then directly test whether it does .pth file processing
            is_site_dir = self.check_pth_processing()
        else:
            # make sure we can write to target dir
            testfile = self.pseudo_tempname() + '.write-test'
            test_exists = os.path.exists(testfile)
            try:
                if test_exists:
                    os.unlink(testfile)
                open(testfile, 'w').close()
                os.unlink(testfile)
            except (OSError, IOError):
                self.cant_write_to_target()

        if not is_site_dir and not self.multi_version:
            # Can't install non-multi to non-site dir
            raise DistutilsError(self.no_default_version_msg())

        if is_site_dir:
            if self.pth_file is None:
                self.pth_file = PthDistributions(pth_file, self.all_site_dirs)
        else:
            self.pth_file = None

        PYTHONPATH = os.environ.get('PYTHONPATH', '').split(os.pathsep)
        if instdir not in map(normalize_path, filter(None, PYTHONPATH)):
            # only PYTHONPATH dirs need a site.py, so pretend it's there
            self.sitepy_installed = True
        elif self.multi_version and not os.path.exists(pth_file):
            self.sitepy_installed = True  # don't need site.py in this case
            self.pth_file = None  # and don't create a .pth file
        self.install_dir = instdir

    __cant_write_msg = textwrap.dedent("""
        can't create or remove files in install directory

        The following error occurred while trying to add or remove files in the
        installation directory:

            %s

        The installation directory you specified (via --install-dir, --prefix, or
        the distutils default setting) was:

            %s
        """).lstrip()

    __not_exists_id = textwrap.dedent("""
        This directory does not currently exist.  Please create it and try again, or
        choose a different installation directory (using the -d or --install-dir
        option).
        """).lstrip()

    __access_msg = textwrap.dedent("""
        Perhaps your account does not have write access to this directory?  If the
        installation directory is a system-owned directory, you may need to sign in
        as the administrator or "root" account.  If you do not have administrative
        access to this machine, you may wish to choose a different installation
        directory, preferably one that is listed in your PYTHONPATH environment
        variable.

        For information on other options, you may wish to consult the
        documentation at:

          https://setuptools.readthedocs.io/en/latest/easy_install.html

        Please make the appropriate changes for your system and try again.
        """).lstrip()

    def cant_write_to_target(self):
        msg = self.__cant_write_msg % (sys.exc_info()[1], self.install_dir,)

        if not os.path.exists(self.install_dir):
            msg += '\n' + self.__not_exists_id
        else:
            msg += '\n' + self.__access_msg
        raise DistutilsError(msg)

    def check_pth_processing(self):
        """Empirically verify whether .pth files are supported in inst. dir"""
        instdir = self.install_dir
        log.info("Checking .pth file support in %s", instdir)
        pth_file = self.pseudo_tempname() + ".pth"
        ok_file = pth_file + '.ok'
        ok_exists = os.path.exists(ok_file)
        tmpl = _one_liner("""
            import os
            f = open({ok_file!r}, 'w')
            f.write('OK')
            f.close()
            """) + '\n'
        try:
            if ok_exists:
                os.unlink(ok_file)
            dirname = os.path.dirname(ok_file)
            if not os.path.exists(dirname):
                os.makedirs(dirname)
            f = open(pth_file, 'w')
        except (OSError, IOError):
            self.cant_write_to_target()
        else:
            try:
                f.write(tmpl.format(**locals()))
                f.close()
                f = None
                executable = sys.executable
                if os.name == 'nt':
                    dirname, basename = os.path.split(executable)
                    alt = os.path.join(dirname, 'pythonw.exe')
                    use_alt = (
                        basename.lower() == 'python.exe' and
                        os.path.exists(alt)
                    )
                    if use_alt:
                        # use pythonw.exe to avoid opening a console window
                        executable = alt

                from distutils.spawn import spawn

                spawn([executable, '-E', '-c', 'pass'], 0)

                if os.path.exists(ok_file):
                    log.info(
                        "TEST PASSED: %s appears to support .pth files",
                        instdir
                    )
                    return True
            finally:
                if f:
                    f.close()
                if os.path.exists(ok_file):
                    os.unlink(ok_file)
                if os.path.exists(pth_file):
                    os.unlink(pth_file)
        if not self.multi_version:
            log.warn("TEST FAILED: %s does NOT support .pth files", instdir)
        return False

    def install_egg_scripts(self, dist):
        """Write all the scripts for `dist`, unless scripts are excluded"""
        if not self.exclude_scripts and dist.metadata_isdir('scripts'):
            for script_name in dist.metadata_listdir('scripts'):
                if dist.metadata_isdir('scripts/' + script_name):
                    # The "script" is a directory, likely a Python 3
                    # __pycache__ directory, so skip it.
                    continue
                self.install_script(
                    dist, script_name,
                    dist.get_metadata('scripts/' + script_name)
                )
        self.install_wrapper_scripts(dist)

    def add_output(self, path):
        if os.path.isdir(path):
            for base, dirs, files in os.walk(path):
                for filename in files:
                    self.outputs.append(os.path.join(base, filename))
        else:
            self.outputs.append(path)

    def not_editable(self, spec):
        if self.editable:
            raise DistutilsArgError(
                "Invalid argument %r: you can't use filenames or URLs "
                "with --editable (except via the --find-links option)."
                % (spec,)
            )

    def check_editable(self, spec):
        if not self.editable:
            return

        if os.path.exists(os.path.join(self.build_directory, spec.key)):
            raise DistutilsArgError(
                "%r already exists in %s; can't do a checkout there" %
                (spec.key, self.build_directory)
            )

    @contextlib.contextmanager
    def _tmpdir(self):
        tmpdir = tempfile.mkdtemp(prefix=six.u("easy_install-"))
        try:
            # cast to str as workaround for #709 and #710 and #712
            yield str(tmpdir)
        finally:
            os.path.exists(tmpdir) and rmtree(rmtree_safe(tmpdir))

    def easy_install(self, spec, deps=False):
        if not self.editable:
            self.install_site_py()

        with self._tmpdir() as tmpdir:
            if not isinstance(spec, Requirement):
                if URL_SCHEME(spec):
                    # It's a url, download it to tmpdir and process
                    self.not_editable(spec)
                    dl = self.package_index.download(spec, tmpdir)
                    return self.install_item(None, dl, tmpdir, deps, True)

                elif os.path.exists(spec):
                    # Existing file or directory, just process it directly
                    self.not_editable(spec)
                    return self.install_item(None, spec, tmpdir, deps, True)
                else:
                    spec = parse_requirement_arg(spec)

            self.check_editable(spec)
            dist = self.package_index.fetch_distribution(
                spec, tmpdir, self.upgrade, self.editable,
                not self.always_copy, self.local_index
            )
            if dist is None:
                msg = "Could not find suitable distribution for %r" % spec
                if self.always_copy:
                    msg += " (--always-copy skips system and development eggs)"
                raise DistutilsError(msg)
            elif dist.precedence == DEVELOP_DIST:
                # .egg-info dists don't need installing, just process deps
                self.process_distribution(spec, dist, deps, "Using")
                return dist
            else:
                return self.install_item(spec, dist.location, tmpdir, deps)

    def install_item(self, spec, download, tmpdir, deps, install_needed=False):

        # Installation is also needed if file in tmpdir or is not an egg
        install_needed = install_needed or self.always_copy
        install_needed = install_needed or os.path.dirname(download) == tmpdir
        install_needed = install_needed or not download.endswith('.egg')
        install_needed = install_needed or (
            self.always_copy_from is not None and
            os.path.dirname(normalize_path(download)) ==
            normalize_path(self.always_copy_from)
        )

        if spec and not install_needed:
            # at this point, we know it's a local .egg, we just don't know if
            # it's already installed.
            for dist in self.local_index[spec.project_name]:
                if dist.location == download:
                    break
            else:
                install_needed = True  # it's not in the local index

        log.info("Processing %s", os.path.basename(download))

        if install_needed:
            dists = self.install_eggs(spec, download, tmpdir)
            for dist in dists:
                self.process_distribution(spec, dist, deps)
        else:
            dists = [self.egg_distribution(download)]
            self.process_distribution(spec, dists[0], deps, "Using")

        if spec is not None:
            for dist in dists:
                if dist in spec:
                    return dist

    def select_scheme(self, name):
        """Sets the install directories by applying the install schemes."""
        # it's the caller's problem if they supply a bad name!
        scheme = INSTALL_SCHEMES[name]
        for key in SCHEME_KEYS:
            attrname = 'install_' + key
            if getattr(self, attrname) is None:
                setattr(self, attrname, scheme[key])

    def process_distribution(self, requirement, dist, deps=True, *info):
        self.update_pth(dist)
        self.package_index.add(dist)
        if dist in self.local_index[dist.key]:
            self.local_index.remove(dist)
        self.local_index.add(dist)
        self.install_egg_scripts(dist)
        self.installed_projects[dist.key] = dist
        log.info(self.installation_report(requirement, dist, *info))
        if (dist.has_metadata('dependency_links.txt') and
                not self.no_find_links):
            self.package_index.add_find_links(
                dist.get_metadata_lines('dependency_links.txt')
            )
        if not deps and not self.always_copy:
            return
        elif requirement is not None and dist.key != requirement.key:
            log.warn("Skipping dependencies for %s", dist)
            return  # XXX this is not the distribution we were looking for
        elif requirement is None or dist not in requirement:
            # if we wound up with a different version, resolve what we've got
            distreq = dist.as_requirement()
            requirement = Requirement(str(distreq))
        log.info("Processing dependencies for %s", requirement)
        try:
            distros = WorkingSet([]).resolve(
                [requirement], self.local_index, self.easy_install
            )
        except DistributionNotFound as e:
            raise DistutilsError(str(e))
        except VersionConflict as e:
            raise DistutilsError(e.report())
        if self.always_copy or self.always_copy_from:
            # Force all the relevant distros to be copied or activated
            for dist in distros:
                if dist.key not in self.installed_projects:
                    self.easy_install(dist.as_requirement())
        log.info("Finished processing dependencies for %s", requirement)

    def should_unzip(self, dist):
        if self.zip_ok is not None:
            return not self.zip_ok
        if dist.has_metadata('not-zip-safe'):
            return True
        if not dist.has_metadata('zip-safe'):
            return True
        return False

    def maybe_move(self, spec, dist_filename, setup_base):
        dst = os.path.join(self.build_directory, spec.key)
        if os.path.exists(dst):
            msg = (
                "%r already exists in %s; build directory %s will not be kept"
            )
            log.warn(msg, spec.key, self.build_directory, setup_base)
            return setup_base
        if os.path.isdir(dist_filename):
            setup_base = dist_filename
        else:
            if os.path.dirname(dist_filename) == setup_base:
                os.unlink(dist_filename)  # get it out of the tmp dir
            contents = os.listdir(setup_base)
            if len(contents) == 1:
                dist_filename = os.path.join(setup_base, contents[0])
                if os.path.isdir(dist_filename):
                    # if the only thing there is a directory, move it instead
                    setup_base = dist_filename
        ensure_directory(dst)
        shutil.move(setup_base, dst)
        return dst

    def install_wrapper_scripts(self, dist):
        if self.exclude_scripts:
            return
        for args in ScriptWriter.best().get_args(dist):
            self.write_script(*args)

    def install_script(self, dist, script_name, script_text, dev_path=None):
        """Generate a legacy script wrapper and install it"""
        spec = str(dist.as_requirement())
        is_script = is_python_script(script_text, script_name)

        if is_script:
            body = self._load_template(dev_path) % locals()
            script_text = ScriptWriter.get_header(script_text) + body
        self.write_script(script_name, _to_ascii(script_text), 'b')

    @staticmethod
    def _load_template(dev_path):
        """
        There are a couple of template scripts in the package. This
        function loads one of them and prepares it for use.
        """
        # See https://github.com/pypa/setuptools/issues/134 for info
        # on script file naming and downstream issues with SVR4
        name = 'script.tmpl'
        if dev_path:
            name = name.replace('.tmpl', ' (dev).tmpl')

        raw_bytes = resource_string('setuptools', name)
        return raw_bytes.decode('utf-8')

    def write_script(self, script_name, contents, mode="t", blockers=()):
        """Write an executable file to the scripts directory"""
        self.delete_blockers(  # clean up old .py/.pyw w/o a script
            [os.path.join(self.script_dir, x) for x in blockers]
        )
        log.info("Installing %s script to %s", script_name, self.script_dir)
        target = os.path.join(self.script_dir, script_name)
        self.add_output(target)

        mask = current_umask()
        if not self.dry_run:
            ensure_directory(target)
            if os.path.exists(target):
                os.unlink(target)
            with open(target, "w" + mode) as f:
                f.write(contents)
            chmod(target, 0o777 - mask)

    def install_eggs(self, spec, dist_filename, tmpdir):
        # .egg dirs or files are already built, so just return them
        if dist_filename.lower().endswith('.egg'):
            return [self.install_egg(dist_filename, tmpdir)]
        elif dist_filename.lower().endswith('.exe'):
            return [self.install_exe(dist_filename, tmpdir)]

        # Anything else, try to extract and build
        setup_base = tmpdir
        if os.path.isfile(dist_filename) and not dist_filename.endswith('.py'):
            unpack_archive(dist_filename, tmpdir, self.unpack_progress)
        elif os.path.isdir(dist_filename):
            setup_base = os.path.abspath(dist_filename)

        if (setup_base.startswith(tmpdir)  # something we downloaded
                and self.build_directory and spec is not None):
            setup_base = self.maybe_move(spec, dist_filename, setup_base)

        # Find the setup.py file
        setup_script = os.path.join(setup_base, 'setup.py')

        if not os.path.exists(setup_script):
            setups = glob(os.path.join(setup_base, '*', 'setup.py'))
            if not setups:
                raise DistutilsError(
                    "Couldn't find a setup script in %s" %
                    os.path.abspath(dist_filename)
                )
            if len(setups) > 1:
                raise DistutilsError(
                    "Multiple setup scripts in %s" %
                    os.path.abspath(dist_filename)
                )
            setup_script = setups[0]

        # Now run it, and return the result
        if self.editable:
            log.info(self.report_editable(spec, setup_script))
            return []
        else:
            return self.build_and_install(setup_script, setup_base)

    def egg_distribution(self, egg_path):
        if os.path.isdir(egg_path):
            metadata = PathMetadata(egg_path, os.path.join(egg_path,
                                                           'EGG-INFO'))
        else:
            metadata = EggMetadata(zipimport.zipimporter(egg_path))
        return Distribution.from_filename(egg_path, metadata=metadata)

    def install_egg(self, egg_path, tmpdir):
        destination = os.path.join(
            self.install_dir,
            os.path.basename(egg_path),
        )
        destination = os.path.abspath(destination)
        if not self.dry_run:
            ensure_directory(destination)

        dist = self.egg_distribution(egg_path)
        if not samefile(egg_path, destination):
            if os.path.isdir(destination) and not os.path.islink(destination):
                dir_util.remove_tree(destination, dry_run=self.dry_run)
            elif os.path.exists(destination):
                self.execute(
                    os.unlink,
                    (destination,),
                    "Removing " + destination,
                )
            try:
                new_dist_is_zipped = False
                if os.path.isdir(egg_path):
                    if egg_path.startswith(tmpdir):
                        f, m = shutil.move, "Moving"
                    else:
                        f, m = shutil.copytree, "Copying"
                elif self.should_unzip(dist):
                    self.mkpath(destination)
                    f, m = self.unpack_and_compile, "Extracting"
                else:
                    new_dist_is_zipped = True
                    if egg_path.startswith(tmpdir):
                        f, m = shutil.move, "Moving"
                    else:
                        f, m = shutil.copy2, "Copying"
                self.execute(
                    f,
                    (egg_path, destination),
                    (m + " %s to %s") % (
                        os.path.basename(egg_path),
                        os.path.dirname(destination)
                    ),
                )
                update_dist_caches(
                    destination,
                    fix_zipimporter_caches=new_dist_is_zipped,
                )
            except Exception:
                update_dist_caches(destination, fix_zipimporter_caches=False)
                raise

        self.add_output(destination)
        return self.egg_distribution(destination)

    def install_exe(self, dist_filename, tmpdir):
        # See if it's valid, get data
        cfg = extract_wininst_cfg(dist_filename)
        if cfg is None:
            raise DistutilsError(
                "%s is not a valid distutils Windows .exe" % dist_filename
            )
        # Create a dummy distribution object until we build the real distro
        dist = Distribution(
            None,
            project_name=cfg.get('metadata', 'name'),
            version=cfg.get('metadata', 'version'), platform=get_platform(),
        )

        # Convert the .exe to an unpacked egg
        egg_path = os.path.join(tmpdir, dist.egg_name() + '.egg')
        dist.location = egg_path
        egg_tmp = egg_path + '.tmp'
        _egg_info = os.path.join(egg_tmp, 'EGG-INFO')
        pkg_inf = os.path.join(_egg_info, 'PKG-INFO')
        ensure_directory(pkg_inf)  # make sure EGG-INFO dir exists
        dist._provider = PathMetadata(egg_tmp, _egg_info)  # XXX
        self.exe_to_egg(dist_filename, egg_tmp)

        # Write EGG-INFO/PKG-INFO
        if not os.path.exists(pkg_inf):
            f = open(pkg_inf, 'w')
            f.write('Metadata-Version: 1.0\n')
            for k, v in cfg.items('metadata'):
                if k != 'target_version':
                    f.write('%s: %s\n' % (k.replace('_', '-').title(), v))
            f.close()
        script_dir = os.path.join(_egg_info, 'scripts')
        # delete entry-point scripts to avoid duping
        self.delete_blockers([
            os.path.join(script_dir, args[0])
            for args in ScriptWriter.get_args(dist)
        ])
        # Build .egg file from tmpdir
        bdist_egg.make_zipfile(
            egg_path, egg_tmp, verbose=self.verbose, dry_run=self.dry_run,
        )
        # install the .egg
        return self.install_egg(egg_path, tmpdir)

    def exe_to_egg(self, dist_filename, egg_tmp):
        """Extract a bdist_wininst to the directories an egg would use"""
        # Check for .pth file and set up prefix translations
        prefixes = get_exe_prefixes(dist_filename)
        to_compile = []
        native_libs = []
        top_level = {}

        def process(src, dst):
            s = src.lower()
            for old, new in prefixes:
                if s.startswith(old):
                    src = new + src[len(old):]
                    parts = src.split('/')
                    dst = os.path.join(egg_tmp, *parts)
                    dl = dst.lower()
                    if dl.endswith('.pyd') or dl.endswith('.dll'):
                        parts[-1] = bdist_egg.strip_module(parts[-1])
                        top_level[os.path.splitext(parts[0])[0]] = 1
                        native_libs.append(src)
                    elif dl.endswith('.py') and old != 'SCRIPTS/':
                        top_level[os.path.splitext(parts[0])[0]] = 1
                        to_compile.append(dst)
                    return dst
            if not src.endswith('.pth'):
                log.warn("WARNING: can't process %s", src)
            return None

        # extract, tracking .pyd/.dll->native_libs and .py -> to_compile
        unpack_archive(dist_filename, egg_tmp, process)
        stubs = []
        for res in native_libs:
            if res.lower().endswith('.pyd'):  # create stubs for .pyd's
                parts = res.split('/')
                resource = parts[-1]
                parts[-1] = bdist_egg.strip_module(parts[-1]) + '.py'
                pyfile = os.path.join(egg_tmp, *parts)
                to_compile.append(pyfile)
                stubs.append(pyfile)
                bdist_egg.write_stub(resource, pyfile)
        self.byte_compile(to_compile)  # compile .py's
        bdist_egg.write_safety_flag(
            os.path.join(egg_tmp, 'EGG-INFO'),
            bdist_egg.analyze_egg(egg_tmp, stubs))  # write zip-safety flag

        for name in 'top_level', 'native_libs':
            if locals()[name]:
                txt = os.path.join(egg_tmp, 'EGG-INFO', name + '.txt')
                if not os.path.exists(txt):
                    f = open(txt, 'w')
                    f.write('\n'.join(locals()[name]) + '\n')
                    f.close()

    __mv_warning = textwrap.dedent("""
        Because this distribution was installed --multi-version, before you can
        import modules from this package in an application, you will need to
        'import pkg_resources' and then use a 'require()' call similar to one of
        these examples, in order to select the desired version:

            pkg_resources.require("%(name)s")  # latest installed version
            pkg_resources.require("%(name)s==%(version)s")  # this exact version
            pkg_resources.require("%(name)s>=%(version)s")  # this version or higher
        """).lstrip()

    __id_warning = textwrap.dedent("""
        Note also that the installation directory must be on sys.path at runtime for
        this to work.  (e.g. by being the application's script directory, by being on
        PYTHONPATH, or by being added to sys.path by your code.)
        """)

    def installation_report(self, req, dist, what="Installed"):
        """Helpful installation message for display to package users"""
        msg = "\n%(what)s %(eggloc)s%(extras)s"
        if self.multi_version and not self.no_report:
            msg += '\n' + self.__mv_warning
            if self.install_dir not in map(normalize_path, sys.path):
                msg += '\n' + self.__id_warning

        eggloc = dist.location
        name = dist.project_name
        version = dist.version
        extras = ''  # TODO: self.report_extras(req, dist)
        return msg % locals()

    __editable_msg = textwrap.dedent("""
        Extracted editable version of %(spec)s to %(dirname)s

        If it uses setuptools in its setup script, you can activate it in
        "development" mode by going to that directory and running::

            %(python)s setup.py develop

        See the setuptools documentation for the "develop" command for more info.
        """).lstrip()

    def report_editable(self, spec, setup_script):
        dirname = os.path.dirname(setup_script)
        python = sys.executable
        return '\n' + self.__editable_msg % locals()

    def run_setup(self, setup_script, setup_base, args):
        sys.modules.setdefault('distutils.command.bdist_egg', bdist_egg)
        sys.modules.setdefault('distutils.command.egg_info', egg_info)

        args = list(args)
        if self.verbose > 2:
            v = 'v' * (self.verbose - 1)
            args.insert(0, '-' + v)
        elif self.verbose < 2:
            args.insert(0, '-q')
        if self.dry_run:
            args.insert(0, '-n')
        log.info(
            "Running %s %s", setup_script[len(setup_base) + 1:], ' '.join(args)
        )
        try:
            run_setup(setup_script, args)
        except SystemExit as v:
            raise DistutilsError("Setup script exited with %s" % (v.args[0],))

    def build_and_install(self, setup_script, setup_base):
        args = ['bdist_egg', '--dist-dir']

        dist_dir = tempfile.mkdtemp(
            prefix='egg-dist-tmp-', dir=os.path.dirname(setup_script)
        )
        try:
            self._set_fetcher_options(os.path.dirname(setup_script))
            args.append(dist_dir)

            self.run_setup(setup_script, setup_base, args)
            all_eggs = Environment([dist_dir])
            eggs = []
            for key in all_eggs:
                for dist in all_eggs[key]:
                    eggs.append(self.install_egg(dist.location, setup_base))
            if not eggs and not self.dry_run:
                log.warn("No eggs found in %s (setup script problem?)",
                         dist_dir)
            return eggs
        finally:
            rmtree(dist_dir)
            log.set_verbosity(self.verbose)  # restore our log verbosity

    def _set_fetcher_options(self, base):
        """
        When easy_install is about to run bdist_egg on a source dist, that
        source dist might have 'setup_requires' directives, requiring
        additional fetching. Ensure the fetcher options given to easy_install
        are available to that command as well.
        """
        # find the fetch options from easy_install and write them out
        # to the setup.cfg file.
        ei_opts = self.distribution.get_option_dict('easy_install').copy()
        fetch_directives = (
            'find_links', 'site_dirs', 'index_url', 'optimize',
            'site_dirs', 'allow_hosts',
        )
        fetch_options = {}
        for key, val in ei_opts.items():
            if key not in fetch_directives:
                continue
            fetch_options[key.replace('_', '-')] = val[1]
        # create a settings dictionary suitable for `edit_config`
        settings = dict(easy_install=fetch_options)
        cfg_filename = os.path.join(base, 'setup.cfg')
        setopt.edit_config(cfg_filename, settings)

    def update_pth(self, dist):
        if self.pth_file is None:
            return

        for d in self.pth_file[dist.key]:  # drop old entries
            if self.multi_version or d.location != dist.location:
                log.info("Removing %s from easy-install.pth file", d)
                self.pth_file.remove(d)
                if d.location in self.shadow_path:
                    self.shadow_path.remove(d.location)

        if not self.multi_version:
            if dist.location in self.pth_file.paths:
                log.info(
                    "%s is already the active version in easy-install.pth",
                    dist,
                )
            else:
                log.info("Adding %s to easy-install.pth file", dist)
                self.pth_file.add(dist)  # add new entry
                if dist.location not in self.shadow_path:
                    self.shadow_path.append(dist.location)

        if not self.dry_run:

            self.pth_file.save()

            if dist.key == 'setuptools':
                # Ensure that setuptools itself never becomes unavailable!
                # XXX should this check for latest version?
                filename = os.path.join(self.install_dir, 'setuptools.pth')
                if os.path.islink(filename):
                    os.unlink(filename)
                f = open(filename, 'wt')
                f.write(self.pth_file.make_relative(dist.location) + '\n')
                f.close()

    def unpack_progress(self, src, dst):
        # Progress filter for unpacking
        log.debug("Unpacking %s to %s", src, dst)
        return dst  # only unpack-and-compile skips files for dry run

    def unpack_and_compile(self, egg_path, destination):
        to_compile = []
        to_chmod = []

        def pf(src, dst):
            if dst.endswith('.py') and not src.startswith('EGG-INFO/'):
                to_compile.append(dst)
            elif dst.endswith('.dll') or dst.endswith('.so'):
                to_chmod.append(dst)
            self.unpack_progress(src, dst)
            return not self.dry_run and dst or None

        unpack_archive(egg_path, destination, pf)
        self.byte_compile(to_compile)
        if not self.dry_run:
            for f in to_chmod:
                mode = ((os.stat(f)[stat.ST_MODE]) | 0o555) & 0o7755
                chmod(f, mode)

    def byte_compile(self, to_compile):
        if sys.dont_write_bytecode:
            self.warn('byte-compiling is disabled, skipping.')
            return

        from distutils.util import byte_compile

        try:
            # try to make the byte compile messages quieter
            log.set_verbosity(self.verbose - 1)

            byte_compile(to_compile, optimize=0, force=1, dry_run=self.dry_run)
            if self.optimize:
                byte_compile(
                    to_compile, optimize=self.optimize, force=1,
                    dry_run=self.dry_run,
                )
        finally:
            log.set_verbosity(self.verbose)  # restore original verbosity

    __no_default_msg = textwrap.dedent("""
        bad install directory or PYTHONPATH

        You are attempting to install a package to a directory that is not
        on PYTHONPATH and which Python does not read ".pth" files from.  The
        installation directory you specified (via --install-dir, --prefix, or
        the distutils default setting) was:

            %s

        and your PYTHONPATH environment variable currently contains:

            %r

        Here are some of your options for correcting the problem:

        * You can choose a different installation directory, i.e., one that is
          on PYTHONPATH or supports .pth files

        * You can add the installation directory to the PYTHONPATH environment
          variable.  (It must then also be on PYTHONPATH whenever you run
          Python and want to use the package(s) you are installing.)

        * You can set up the installation directory to support ".pth" files by
          using one of the approaches described here:

          https://setuptools.readthedocs.io/en/latest/easy_install.html#custom-installation-locations


        Please make the appropriate changes for your system and try again.""").lstrip()

    def no_default_version_msg(self):
        template = self.__no_default_msg
        return template % (self.install_dir, os.environ.get('PYTHONPATH', ''))

    def install_site_py(self):
        """Make sure there's a site.py in the target dir, if needed"""

        if self.sitepy_installed:
            return  # already did it, or don't need to

        sitepy = os.path.join(self.install_dir, "site.py")
        source = resource_string("setuptools", "site-patch.py")
        source = source.decode('utf-8')
        current = ""

        if os.path.exists(sitepy):
            log.debug("Checking existing site.py in %s", self.install_dir)
            with io.open(sitepy) as strm:
                current = strm.read()

            if not current.startswith('def __boot():'):
                raise DistutilsError(
                    "%s is not a setuptools-generated site.py; please"
                    " remove it." % sitepy
                )

        if current != source:
            log.info("Creating %s", sitepy)
            if not self.dry_run:
                ensure_directory(sitepy)
                with io.open(sitepy, 'w', encoding='utf-8') as strm:
                    strm.write(source)
            self.byte_compile([sitepy])

        self.sitepy_installed = True

    def create_home_path(self):
        """Create directories under ~."""
        if not self.user:
            return
        home = convert_path(os.path.expanduser("~"))
        for name, path in six.iteritems(self.config_vars):
            if path.startswith(home) and not os.path.isdir(path):
                self.debug_print("os.makedirs('%s', 0o700)" % path)
                os.makedirs(path, 0o700)

    if sys.version[:3] in ('2.3', '2.4', '2.5') or 'real_prefix' in sys.__dict__:
        sitedir_name = 'site-packages'
    else:
        sitedir_name = 'dist-packages'

    INSTALL_SCHEMES = dict(
        posix=dict(
            install_dir='$base/lib/python$py_version_short/site-packages',
            script_dir='$base/bin',
        ),
        unix_local = dict(
            install_dir = '$base/local/lib/python$py_version_short/%s' % sitedir_name,
            script_dir  = '$base/local/bin',
        ),
        posix_local = dict(
            install_dir = '$base/local/lib/python$py_version_short/%s' % sitedir_name,
            script_dir  = '$base/local/bin',
        ),
        deb_system = dict(
            install_dir = '$base/lib/python3/%s' % sitedir_name,
            script_dir  = '$base/bin',
        ),
    )

    DEFAULT_SCHEME = dict(
        install_dir='$base/Lib/site-packages',
        script_dir='$base/Scripts',
    )

    def _expand(self, *attrs):
        config_vars = self.get_finalized_command('install').config_vars

        if self.prefix or self.install_layout:
            if self.install_layout and self.install_layout in ['deb']:
                    scheme_name = "deb_system"
                    self.prefix = '/usr'
            elif self.prefix or 'real_prefix' in sys.__dict__:
                scheme_name = os.name
            else:
                scheme_name = "posix_local"
            # Set default install_dir/scripts from --prefix
            config_vars = config_vars.copy()
            config_vars['base'] = self.prefix
            scheme = self.INSTALL_SCHEMES.get(scheme_name,self.DEFAULT_SCHEME)
            for attr, val in scheme.items():
                if getattr(self, attr, None) is None:
                    setattr(self, attr, val)

        from distutils.util import subst_vars

        for attr in attrs:
            val = getattr(self, attr)
            if val is not None:
                val = subst_vars(val, config_vars)
                if os.name == 'posix':
                    val = os.path.expanduser(val)
                setattr(self, attr, val)


def get_site_dirs():
    # return a list of 'site' dirs
    sitedirs = [_f for _f in os.environ.get('PYTHONPATH',
                                            '').split(os.pathsep) if _f]
    prefixes = [sys.prefix]
    if sys.exec_prefix != sys.prefix:
        prefixes.append(sys.exec_prefix)
    for prefix in prefixes:
        if prefix:
            if sys.platform in ('os2emx', 'riscos'):
                sitedirs.append(os.path.join(prefix, "Lib", "site-packages"))
            elif os.sep == '/':
                sitedirs.extend([
                    os.path.join(
                        prefix,
                        "local/lib",
                        "python" + sys.version[:3],
                        "dist-packages",
                    ),
                    os.path.join(
                        prefix,
                        "lib",
                        "python" + sys.version[:3],
                        "dist-packages",
                    ),
                    os.path.join(prefix, "lib", "site-python"),
                ])
            else:
                sitedirs.extend([
                    prefix,
                    os.path.join(prefix, "lib", "site-packages"),
                ])
            if sys.platform == 'darwin':
                # for framework builds *only* we add the standard Apple
                # locations. Currently only per-user, but /Library and
                # /Network/Library could be added too
                if 'Python.framework' in prefix:
                    home = os.environ.get('HOME')
                    if home:
                        home_sp = os.path.join(
                            home,
                            'Library',
                            'Python',
                            sys.version[:3],
                            'site-packages',
                        )
                        sitedirs.append(home_sp)
    lib_paths = get_path('purelib'), get_path('platlib')
    for site_lib in lib_paths:
        if site_lib not in sitedirs:
            sitedirs.append(site_lib)

    if site.ENABLE_USER_SITE:
        sitedirs.append(site.USER_SITE)

    try:
        sitedirs.extend(site.getsitepackages())
    except AttributeError:
        pass

    sitedirs = list(map(normalize_path, sitedirs))

    return sitedirs


def expand_paths(inputs):
    """Yield sys.path directories that might contain "old-style" packages"""

    seen = {}

    for dirname in inputs:
        dirname = normalize_path(dirname)
        if dirname in seen:
            continue

        seen[dirname] = 1
        if not os.path.isdir(dirname):
            continue

        files = os.listdir(dirname)
        yield dirname, files

        for name in files:
            if not name.endswith('.pth'):
                # We only care about the .pth files
                continue
            if name in ('easy-install.pth', 'setuptools.pth'):
                # Ignore .pth files that we control
                continue

            # Read the .pth file
            f = open(os.path.join(dirname, name))
            lines = list(yield_lines(f))
            f.close()

            # Yield existing non-dupe, non-import directory lines from it
            for line in lines:
                if not line.startswith("import"):
                    line = normalize_path(line.rstrip())
                    if line not in seen:
                        seen[line] = 1
                        if not os.path.isdir(line):
                            continue
                        yield line, os.listdir(line)


def extract_wininst_cfg(dist_filename):
    """Extract configuration data from a bdist_wininst .exe

    Returns a configparser.RawConfigParser, or None
    """
    f = open(dist_filename, 'rb')
    try:
        endrec = zipfile._EndRecData(f)
        if endrec is None:
            return None

        prepended = (endrec[9] - endrec[5]) - endrec[6]
        if prepended < 12:  # no wininst data here
            return None
        f.seek(prepended - 12)

        tag, cfglen, bmlen = struct.unpack("<iii", f.read(12))
        if tag not in (0x1234567A, 0x1234567B):
            return None  # not a valid tag

        f.seek(prepended - (12 + cfglen))
        init = {'version': '', 'target_version': ''}
        cfg = configparser.RawConfigParser(init)
        try:
            part = f.read(cfglen)
            # Read up to the first null byte.
            config = part.split(b'\0', 1)[0]
            # Now the config is in bytes, but for RawConfigParser, it should
            #  be text, so decode it.
            config = config.decode(sys.getfilesystemencoding())
            cfg.readfp(six.StringIO(config))
        except configparser.Error:
            return None
        if not cfg.has_section('metadata') or not cfg.has_section('Setup'):
            return None
        return cfg

    finally:
        f.close()


def get_exe_prefixes(exe_filename):
    """Get exe->egg path translations for a given .exe file"""

    prefixes = [
        ('PURELIB/', ''),
        ('PLATLIB/pywin32_system32', ''),
        ('PLATLIB/', ''),
        ('SCRIPTS/', 'EGG-INFO/scripts/'),
        ('DATA/lib/site-packages', ''),
    ]
    z = zipfile.ZipFile(exe_filename)
    try:
        for info in z.infolist():
            name = info.filename
            parts = name.split('/')
            if len(parts) == 3 and parts[2] == 'PKG-INFO':
                if parts[1].endswith('.egg-info'):
                    prefixes.insert(0, ('/'.join(parts[:2]), 'EGG-INFO/'))
                    break
            if len(parts) != 2 or not name.endswith('.pth'):
                continue
            if name.endswith('-nspkg.pth'):
                continue
            if parts[0].upper() in ('PURELIB', 'PLATLIB'):
                contents = z.read(name)
                if six.PY3:
                    contents = contents.decode()
                for pth in yield_lines(contents):
                    pth = pth.strip().replace('\\', '/')
                    if not pth.startswith('import'):
                        prefixes.append((('%s/%s/' % (parts[0], pth)), ''))
    finally:
        z.close()
    prefixes = [(x.lower(), y) for x, y in prefixes]
    prefixes.sort()
    prefixes.reverse()
    return prefixes


class PthDistributions(Environment):
    """A .pth file with Distribution paths in it"""

    dirty = False

    def __init__(self, filename, sitedirs=()):
        self.filename = filename
        self.sitedirs = list(map(normalize_path, sitedirs))
        self.basedir = normalize_path(os.path.dirname(self.filename))
        self._load()
        Environment.__init__(self, [], None, None)
        for path in yield_lines(self.paths):
            list(map(self.add, find_distributions(path, True)))

    def _load(self):
        self.paths = []
        saw_import = False
        seen = dict.fromkeys(self.sitedirs)
        if os.path.isfile(self.filename):
            f = open(self.filename, 'rt')
            for line in f:
                if line.startswith('import'):
                    saw_import = True
                    continue
                path = line.rstrip()
                self.paths.append(path)
                if not path.strip() or path.strip().startswith('#'):
                    continue
                # skip non-existent paths, in case somebody deleted a package
                # manually, and duplicate paths as well
                path = self.paths[-1] = normalize_path(
                    os.path.join(self.basedir, path)
                )
                if not os.path.exists(path) or path in seen:
                    self.paths.pop()  # skip it
                    self.dirty = True  # we cleaned up, so we're dirty now :)
                    continue
                seen[path] = 1
            f.close()

        if self.paths and not saw_import:
            self.dirty = True  # ensure anything we touch has import wrappers
        while self.paths and not self.paths[-1].strip():
            self.paths.pop()

    def save(self):
        """Write changed .pth file back to disk"""
        if not self.dirty:
            return

        rel_paths = list(map(self.make_relative, self.paths))
        if rel_paths:
            log.debug("Saving %s", self.filename)
            lines = self._wrap_lines(rel_paths)
            data = '\n'.join(lines) + '\n'

            if os.path.islink(self.filename):
                os.unlink(self.filename)
            with open(self.filename, 'wt') as f:
                f.write(data)

        elif os.path.exists(self.filename):
            log.debug("Deleting empty %s", self.filename)
            os.unlink(self.filename)

        self.dirty = False

    @staticmethod
    def _wrap_lines(lines):
        return lines

    def add(self, dist):
        """Add `dist` to the distribution map"""
        new_path = (
            dist.location not in self.paths and (
                dist.location not in self.sitedirs or
                # account for '.' being in PYTHONPATH
                dist.location == os.getcwd()
            )
        )
        if new_path:
            self.paths.append(dist.location)
            self.dirty = True
        Environment.add(self, dist)

    def remove(self, dist):
        """Remove `dist` from the distribution map"""
        while dist.location in self.paths:
            self.paths.remove(dist.location)
            self.dirty = True
        Environment.remove(self, dist)

    def make_relative(self, path):
        npath, last = os.path.split(normalize_path(path))
        baselen = len(self.basedir)
        parts = [last]
        sep = os.altsep == '/' and '/' or os.sep
        while len(npath) >= baselen:
            if npath == self.basedir:
                parts.append(os.curdir)
                parts.reverse()
                return sep.join(parts)
            npath, last = os.path.split(npath)
            parts.append(last)
        else:
            return path


class RewritePthDistributions(PthDistributions):
    @classmethod
    def _wrap_lines(cls, lines):
        yield cls.prelude
        for line in lines:
            yield line
        yield cls.postlude

    prelude = _one_liner("""
        import sys
        sys.__plen = len(sys.path)
        """)
    postlude = _one_liner("""
        import sys
        new = sys.path[sys.__plen:]
        del sys.path[sys.__plen:]
        p = getattr(sys, '__egginsert', 0)
        sys.path[p:p] = new
        sys.__egginsert = p + len(new)
        """)


if os.environ.get('SETUPTOOLS_SYS_PATH_TECHNIQUE', 'raw') == 'rewrite':
    PthDistributions = RewritePthDistributions


def _first_line_re():
    """
    Return a regular expression based on first_line_re suitable for matching
    strings.
    """
    if isinstance(first_line_re.pattern, str):
        return first_line_re

    # first_line_re in Python >=3.1.4 and >=3.2.1 is a bytes pattern.
    return re.compile(first_line_re.pattern.decode())


def auto_chmod(func, arg, exc):
    if func is os.remove and os.name == 'nt':
        chmod(arg, stat.S_IWRITE)
        return func(arg)
    et, ev, _ = sys.exc_info()
    six.reraise(et, (ev[0], ev[1] + (" %s %s" % (func, arg))))


def update_dist_caches(dist_path, fix_zipimporter_caches):
    """
    Fix any globally cached `dist_path` related data

    `dist_path` should be a path of a newly installed egg distribution (zipped
    or unzipped).

    sys.path_importer_cache contains finder objects that have been cached when
    importing data from the original distribution. Any such finders need to be
    cleared since the replacement distribution might be packaged differently,
    e.g. a zipped egg distribution might get replaced with an unzipped egg
    folder or vice versa. Having the old finders cached may then cause Python
    to attempt loading modules from the replacement distribution using an
    incorrect loader.

    zipimport.zipimporter objects are Python loaders charged with importing
    data packaged inside zip archives. If stale loaders referencing the
    original distribution, are left behind, they can fail to load modules from
    the replacement distribution. E.g. if an old zipimport.zipimporter instance
    is used to load data from a new zipped egg archive, it may cause the
    operation to attempt to locate the requested data in the wrong location -
    one indicated by the original distribution's zip archive directory
    information. Such an operation may then fail outright, e.g. report having
    read a 'bad local file header', or even worse, it may fail silently &
    return invalid data.

    zipimport._zip_directory_cache contains cached zip archive directory
    information for all existing zipimport.zipimporter instances and all such
    instances connected to the same archive share the same cached directory
    information.

    If asked, and the underlying Python implementation allows it, we can fix
    all existing zipimport.zipimporter instances instead of having to track
    them down and remove them one by one, by updating their shared cached zip
    archive directory information. This, of course, assumes that the
    replacement distribution is packaged as a zipped egg.

    If not asked to fix existing zipimport.zipimporter instances, we still do
    our best to clear any remaining zipimport.zipimporter related cached data
    that might somehow later get used when attempting to load data from the new
    distribution and thus cause such load operations to fail. Note that when
    tracking down such remaining stale data, we can not catch every conceivable
    usage from here, and we clear only those that we know of and have found to
    cause problems if left alive. Any remaining caches should be updated by
    whomever is in charge of maintaining them, i.e. they should be ready to
    handle us replacing their zip archives with new distributions at runtime.

    """
    # There are several other known sources of stale zipimport.zipimporter
    # instances that we do not clear here, but might if ever given a reason to
    # do so:
    # * Global setuptools pkg_resources.working_set (a.k.a. 'master working
    # set') may contain distributions which may in turn contain their
    #   zipimport.zipimporter loaders.
    # * Several zipimport.zipimporter loaders held by local variables further
    #   up the function call stack when running the setuptools installation.
    # * Already loaded modules may have their __loader__ attribute set to the
    #   exact loader instance used when importing them. Python 3.4 docs state
    #   that this information is intended mostly for introspection and so is
    #   not expected to cause us problems.
    normalized_path = normalize_path(dist_path)
    _uncache(normalized_path, sys.path_importer_cache)
    if fix_zipimporter_caches:
        _replace_zip_directory_cache_data(normalized_path)
    else:
        # Here, even though we do not want to fix existing and now stale
        # zipimporter cache information, we still want to remove it. Related to
        # Python's zip archive directory information cache, we clear each of
        # its stale entries in two phases:
        #   1. Clear the entry so attempting to access zip archive information
        #      via any existing stale zipimport.zipimporter instances fails.
        #   2. Remove the entry from the cache so any newly constructed
        #      zipimport.zipimporter instances do not end up using old stale
        #      zip archive directory information.
        # This whole stale data removal step does not seem strictly necessary,
        # but has been left in because it was done before we started replacing
        # the zip archive directory information cache content if possible, and
        # there are no relevant unit tests that we can depend on to tell us if
        # this is really needed.
        _remove_and_clear_zip_directory_cache_data(normalized_path)


def _collect_zipimporter_cache_entries(normalized_path, cache):
    """
    Return zipimporter cache entry keys related to a given normalized path.

    Alternative path spellings (e.g. those using different character case or
    those using alternative path separators) related to the same path are
    included. Any sub-path entries are included as well, i.e. those
    corresponding to zip archives embedded in other zip archives.

    """
    result = []
    prefix_len = len(normalized_path)
    for p in cache:
        np = normalize_path(p)
        if (np.startswith(normalized_path) and
                np[prefix_len:prefix_len + 1] in (os.sep, '')):
            result.append(p)
    return result


def _update_zipimporter_cache(normalized_path, cache, updater=None):
    """
    Update zipimporter cache data for a given normalized path.

    Any sub-path entries are processed as well, i.e. those corresponding to zip
    archives embedded in other zip archives.

    Given updater is a callable taking a cache entry key and the original entry
    (after already removing the entry from the cache), and expected to update
    the entry and possibly return a new one to be inserted in its place.
    Returning None indicates that the entry should not be replaced with a new
    one. If no updater is given, the cache entries are simply removed without
    any additional processing, the same as if the updater simply returned None.

    """
    for p in _collect_zipimporter_cache_entries(normalized_path, cache):
        # N.B. pypy's custom zipimport._zip_directory_cache implementation does
        # not support the complete dict interface:
        # * Does not support item assignment, thus not allowing this function
        #    to be used only for removing existing cache entries.
        #  * Does not support the dict.pop() method, forcing us to use the
        #    get/del patterns instead. For more detailed information see the
        #    following links:
        #      https://github.com/pypa/setuptools/issues/202#issuecomment-202913420
        #      https://bitbucket.org/pypy/pypy/src/dd07756a34a41f674c0cacfbc8ae1d4cc9ea2ae4/pypy/module/zipimport/interp_zipimport.py#cl-99
        old_entry = cache[p]
        del cache[p]
        new_entry = updater and updater(p, old_entry)
        if new_entry is not None:
            cache[p] = new_entry


def _uncache(normalized_path, cache):
    _update_zipimporter_cache(normalized_path, cache)


def _remove_and_clear_zip_directory_cache_data(normalized_path):
    def clear_and_remove_cached_zip_archive_directory_data(path, old_entry):
        old_entry.clear()

    _update_zipimporter_cache(
        normalized_path, zipimport._zip_directory_cache,
        updater=clear_and_remove_cached_zip_archive_directory_data)


# PyPy Python implementation does not allow directly writing to the
# zipimport._zip_directory_cache and so prevents us from attempting to correct
# its content. The best we can do there is clear the problematic cache content
# and have PyPy repopulate it as needed. The downside is that if there are any
# stale zipimport.zipimporter instances laying around, attempting to use them
# will fail due to not having its zip archive directory information available
# instead of being automatically corrected to use the new correct zip archive
# directory information.
if '__pypy__' in sys.builtin_module_names:
    _replace_zip_directory_cache_data = \
        _remove_and_clear_zip_directory_cache_data
else:

    def _replace_zip_directory_cache_data(normalized_path):
        def replace_cached_zip_archive_directory_data(path, old_entry):
            # N.B. In theory, we could load the zip directory information just
            # once for all updated path spellings, and then copy it locally and
            # update its contained path strings to contain the correct
            # spelling, but that seems like a way too invasive move (this cache
            # structure is not officially documented anywhere and could in
            # theory change with new Python releases) for no significant
            # benefit.
            old_entry.clear()
            zipimport.zipimporter(path)
            old_entry.update(zipimport._zip_directory_cache[path])
            return old_entry

        _update_zipimporter_cache(
            normalized_path, zipimport._zip_directory_cache,
            updater=replace_cached_zip_archive_directory_data)


def is_python(text, filename='<string>'):
    "Is this string a valid Python script?"
    try:
        compile(text, filename, 'exec')
    except (SyntaxError, TypeError):
        return False
    else:
        return True


def is_sh(executable):
    """Determine if the specified executable is a .sh (contains a #! line)"""
    try:
        with io.open(executable, encoding='latin-1') as fp:
            magic = fp.read(2)
    except (OSError, IOError):
        return executable
    return magic == '#!'


def nt_quote_arg(arg):
    """Quote a command line argument according to Windows parsing rules"""
    return subprocess.list2cmdline([arg])


def is_python_script(script_text, filename):
    """Is this text, as a whole, a Python script? (as opposed to shell/bat/etc.
    """
    if filename.endswith('.py') or filename.endswith('.pyw'):
        return True  # extension says it's Python
    if is_python(script_text, filename):
        return True  # it's syntactically valid Python
    if script_text.startswith('#!'):
        # It begins with a '#!' line, so check if 'python' is in it somewhere
        return 'python' in script_text.splitlines()[0].lower()

    return False  # Not any Python I can recognize


try:
    from os import chmod as _chmod
except ImportError:
    # Jython compatibility
    def _chmod(*args):
        pass


def chmod(path, mode):
    log.debug("changing mode of %s to %o", path, mode)
    try:
        _chmod(path, mode)
    except os.error as e:
        log.debug("chmod failed: %s", e)


class CommandSpec(list):
    """
    A command spec for a #! header, specified as a list of arguments akin to
    those passed to Popen.
    """

    options = []
    split_args = dict()

    @classmethod
    def best(cls):
        """
        Choose the best CommandSpec class based on environmental conditions.
        """
        return cls

    @classmethod
    def _sys_executable(cls):
        _default = os.path.normpath(sys.executable)
        return os.environ.get('__PYVENV_LAUNCHER__', _default)

    @classmethod
    def from_param(cls, param):
        """
        Construct a CommandSpec from a parameter to build_scripts, which may
        be None.
        """
        if isinstance(param, cls):
            return param
        if isinstance(param, list):
            return cls(param)
        if param is None:
            return cls.from_environment()
        # otherwise, assume it's a string.
        return cls.from_string(param)

    @classmethod
    def from_environment(cls):
        return cls([cls._sys_executable()])

    @classmethod
    def from_string(cls, string):
        """
        Construct a command spec from a simple string representing a command
        line parseable by shlex.split.
        """
        items = shlex.split(string, **cls.split_args)
        return cls(items)

    def install_options(self, script_text):
        self.options = shlex.split(self._extract_options(script_text))
        cmdline = subprocess.list2cmdline(self)
        if not isascii(cmdline):
            self.options[:0] = ['-x']

    @staticmethod
    def _extract_options(orig_script):
        """
        Extract any options from the first line of the script.
        """
        first = (orig_script + '\n').splitlines()[0]
        match = _first_line_re().match(first)
        options = match.group(1) or '' if match else ''
        return options.strip()

    def as_header(self):
        return self._render(self + list(self.options))

    @staticmethod
    def _strip_quotes(item):
        _QUOTES = '"\''
        for q in _QUOTES:
            if item.startswith(q) and item.endswith(q):
                return item[1:-1]
        return item

    @staticmethod
    def _render(items):
        cmdline = subprocess.list2cmdline(
            CommandSpec._strip_quotes(item.strip()) for item in items)
        return '#!' + cmdline + '\n'


# For pbr compat; will be removed in a future version.
sys_executable = CommandSpec._sys_executable()


class WindowsCommandSpec(CommandSpec):
    split_args = dict(posix=False)


class ScriptWriter(object):
    """
    Encapsulates behavior around writing entry point scripts for console and
    gui apps.
    """

    template = textwrap.dedent("""
        # EASY-INSTALL-ENTRY-SCRIPT: %(spec)r,%(group)r,%(name)r
        __requires__ = %(spec)r
        import re
        import sys
        from pkg_resources import load_entry_point

        if __name__ == '__main__':
            sys.argv[0] = re.sub(r'(-script\.pyw?|\.exe)?$', '', sys.argv[0])
            sys.exit(
                load_entry_point(%(spec)r, %(group)r, %(name)r)()
            )
    """).lstrip()

    command_spec_class = CommandSpec

    @classmethod
    def get_script_args(cls, dist, executable=None, wininst=False):
        # for backward compatibility
        warnings.warn("Use get_args", DeprecationWarning)
        writer = (WindowsScriptWriter if wininst else ScriptWriter).best()
        header = cls.get_script_header("", executable, wininst)
        return writer.get_args(dist, header)

    @classmethod
    def get_script_header(cls, script_text, executable=None, wininst=False):
        # for backward compatibility
        warnings.warn("Use get_header", DeprecationWarning)
        if wininst:
            executable = "python.exe"
        cmd = cls.command_spec_class.best().from_param(executable)
        cmd.install_options(script_text)
        return cmd.as_header()

    @classmethod
    def get_args(cls, dist, header=None):
        """
        Yield write_script() argument tuples for a distribution's
        console_scripts and gui_scripts entry points.
        """
        if header is None:
            header = cls.get_header()
        spec = str(dist.as_requirement())
        for type_ in 'console', 'gui':
            group = type_ + '_scripts'
            for name, ep in dist.get_entry_map(group).items():
                cls._ensure_safe_name(name)
                script_text = cls.template % locals()
                args = cls._get_script_args(type_, name, header, script_text)
                for res in args:
                    yield res

    @staticmethod
    def _ensure_safe_name(name):
        """
        Prevent paths in *_scripts entry point names.
        """
        has_path_sep = re.search(r'[\\/]', name)
        if has_path_sep:
            raise ValueError("Path separators not allowed in script names")

    @classmethod
    def get_writer(cls, force_windows):
        # for backward compatibility
        warnings.warn("Use best", DeprecationWarning)
        return WindowsScriptWriter.best() if force_windows else cls.best()

    @classmethod
    def best(cls):
        """
        Select the best ScriptWriter for this environment.
        """
        if sys.platform == 'win32' or (os.name == 'java' and os._name == 'nt'):
            return WindowsScriptWriter.best()
        else:
            return cls

    @classmethod
    def _get_script_args(cls, type_, name, header, script_text):
        # Simply write the stub with no extension.
        yield (name, header + script_text)

    @classmethod
    def get_header(cls, script_text="", executable=None):
        """Create a #! line, getting options (if any) from script_text"""
        cmd = cls.command_spec_class.best().from_param(executable)
        cmd.install_options(script_text)
        return cmd.as_header()


class WindowsScriptWriter(ScriptWriter):
    command_spec_class = WindowsCommandSpec

    @classmethod
    def get_writer(cls):
        # for backward compatibility
        warnings.warn("Use best", DeprecationWarning)
        return cls.best()

    @classmethod
    def best(cls):
        """
        Select the best ScriptWriter suitable for Windows
        """
        writer_lookup = dict(
            executable=WindowsExecutableLauncherWriter,
            natural=cls,
        )
        # for compatibility, use the executable launcher by default
        launcher = os.environ.get('SETUPTOOLS_LAUNCHER', 'executable')
        return writer_lookup[launcher]

    @classmethod
    def _get_script_args(cls, type_, name, header, script_text):
        "For Windows, add a .py extension"
        ext = dict(console='.pya', gui='.pyw')[type_]
        if ext not in os.environ['PATHEXT'].lower().split(';'):
            msg = (
                "{ext} not listed in PATHEXT; scripts will not be "
                "recognized as executables."
            ).format(**locals())
            warnings.warn(msg, UserWarning)
        old = ['.pya', '.py', '-script.py', '.pyc', '.pyo', '.pyw', '.exe']
        old.remove(ext)
        header = cls._adjust_header(type_, header)
        blockers = [name + x for x in old]
        yield name + ext, header + script_text, 't', blockers

    @classmethod
    def _adjust_header(cls, type_, orig_header):
        """
        Make sure 'pythonw' is used for gui and and 'python' is used for
        console (regardless of what sys.executable is).
        """
        pattern = 'pythonw.exe'
        repl = 'python.exe'
        if type_ == 'gui':
            pattern, repl = repl, pattern
        pattern_ob = re.compile(re.escape(pattern), re.IGNORECASE)
        new_header = pattern_ob.sub(string=orig_header, repl=repl)
        return new_header if cls._use_header(new_header) else orig_header

    @staticmethod
    def _use_header(new_header):
        """
        Should _adjust_header use the replaced header?

        On non-windows systems, always use. On
        Windows systems, only use the replaced header if it resolves
        to an executable on the system.
        """
        clean_header = new_header[2:-1].strip('"')
        return sys.platform != 'win32' or find_executable(clean_header)


class WindowsExecutableLauncherWriter(WindowsScriptWriter):
    @classmethod
    def _get_script_args(cls, type_, name, header, script_text):
        """
        For Windows, add a .py extension and an .exe launcher
        """
        if type_ == 'gui':
            launcher_type = 'gui'
            ext = '-script.pyw'
            old = ['.pyw']
        else:
            launcher_type = 'cli'
            ext = '-script.py'
            old = ['.py', '.pyc', '.pyo']
        hdr = cls._adjust_header(type_, header)
        blockers = [name + x for x in old]
        yield (name + ext, hdr + script_text, 't', blockers)
        yield (
            name + '.exe', get_win_launcher(launcher_type),
            'b'  # write in binary mode
        )
        if not is_64bit():
            # install a manifest for the launcher to prevent Windows
            # from detecting it as an installer (which it will for
            #  launchers like easy_install.exe). Consider only
            #  adding a manifest for launchers detected as installers.
            #  See Distribute #143 for details.
            m_name = name + '.exe.manifest'
            yield (m_name, load_launcher_manifest(name), 't')


# for backward-compatibility
get_script_args = ScriptWriter.get_script_args
get_script_header = ScriptWriter.get_script_header


def get_win_launcher(type):
    """
    Load the Windows launcher (executable) suitable for launching a script.

    `type` should be either 'cli' or 'gui'

    Returns the executable as a byte string.
    """
    launcher_fn = '%s.exe' % type
    if is_64bit():
        launcher_fn = launcher_fn.replace(".", "-64.")
    else:
        launcher_fn = launcher_fn.replace(".", "-32.")
    return resource_string('setuptools', launcher_fn)


def load_launcher_manifest(name):
    manifest = pkg_resources.resource_string(__name__, 'launcher manifest.xml')
    if six.PY2:
        return manifest % vars()
    else:
        return manifest.decode('utf-8') % vars()


def rmtree(path, ignore_errors=False, onerror=auto_chmod):
    return shutil.rmtree(path, ignore_errors, onerror)


def current_umask():
    tmp = os.umask(0o022)
    os.umask(tmp)
    return tmp


def bootstrap():
    # This function is called when setuptools*.egg is run using /bin/sh
    import setuptools

    argv0 = os.path.dirname(setuptools.__path__[0])
    sys.argv[0] = argv0
    sys.argv.append(argv0)
    main()


def main(argv=None, **kw):
    from setuptools import setup
    from setuptools.dist import Distribution

    class DistributionWithoutHelpCommands(Distribution):
        common_usage = ""

        def _show_help(self, *args, **kw):
            with _patch_usage():
                Distribution._show_help(self, *args, **kw)

    if argv is None:
        argv = sys.argv[1:]

    with _patch_usage():
        setup(
            script_args=['-q', 'easy_install', '-v'] + argv,
            script_name=sys.argv[0] or 'easy_install',
            distclass=DistributionWithoutHelpCommands,
            **kw
        )


@contextlib.contextmanager
def _patch_usage():
    import distutils.core
    USAGE = textwrap.dedent("""
        usage: %(script)s [options] requirement_or_url ...
           or: %(script)s --help
        """).lstrip()

    def gen_usage(script_name):
        return USAGE % dict(
            script=os.path.basename(script_name),
        )

    saved = distutils.core.gen_usage
    distutils.core.gen_usage = gen_usage
    try:
        yield
    finally:
        distutils.core.gen_usage = saved