aboutsummaryrefslogtreecommitdiff
path: root/config.c
blob: 752e2e227f56edfb7b2ad168798c110c14a2c5e8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
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
/*
 * GIT - The information manager from hell
 *
 * Copyright (C) Linus Torvalds, 2005
 * Copyright (C) Johannes Schindelin, 2005
 *
 */
#include "cache.h"
#include "lockfile.h"
#include "exec_cmd.h"
#include "strbuf.h"
#include "quote.h"
#include "hashmap.h"
#include "string-list.h"

struct config_source {
	struct config_source *prev;
	union {
		FILE *file;
		struct config_buf {
			const char *buf;
			size_t len;
			size_t pos;
		} buf;
	} u;
	const char *name;
	const char *path;
	int die_on_error;
	int linenr;
	int eof;
	struct strbuf value;
	struct strbuf var;

	int (*do_fgetc)(struct config_source *c);
	int (*do_ungetc)(int c, struct config_source *conf);
	long (*do_ftell)(struct config_source *c);
};

static struct config_source *cf;

static int zlib_compression_seen;

/*
 * Default config_set that contains key-value pairs from the usual set of config
 * config files (i.e repo specific .git/config, user wide ~/.gitconfig, XDG
 * config file and the global /etc/gitconfig)
 */
static struct config_set the_config_set;

static int config_file_fgetc(struct config_source *conf)
{
	return fgetc(conf->u.file);
}

static int config_file_ungetc(int c, struct config_source *conf)
{
	return ungetc(c, conf->u.file);
}

static long config_file_ftell(struct config_source *conf)
{
	return ftell(conf->u.file);
}


static int config_buf_fgetc(struct config_source *conf)
{
	if (conf->u.buf.pos < conf->u.buf.len)
		return conf->u.buf.buf[conf->u.buf.pos++];

	return EOF;
}

static int config_buf_ungetc(int c, struct config_source *conf)
{
	if (conf->u.buf.pos > 0)
		return conf->u.buf.buf[--conf->u.buf.pos];

	return EOF;
}

static long config_buf_ftell(struct config_source *conf)
{
	return conf->u.buf.pos;
}

#define MAX_INCLUDE_DEPTH 10
static const char include_depth_advice[] =
"exceeded maximum include depth (%d) while including\n"
"	%s\n"
"from\n"
"	%s\n"
"Do you have circular includes?";
static int handle_path_include(const char *path, struct config_include_data *inc)
{
	int ret = 0;
	struct strbuf buf = STRBUF_INIT;
	char *expanded;

	if (!path)
		return config_error_nonbool("include.path");

	expanded = expand_user_path(path);
	if (!expanded)
		return error("Could not expand include path '%s'", path);
	path = expanded;

	/*
	 * Use an absolute path as-is, but interpret relative paths
	 * based on the including config file.
	 */
	if (!is_absolute_path(path)) {
		char *slash;

		if (!cf || !cf->path)
			return error("relative config includes must come from files");

		slash = find_last_dir_sep(cf->path);
		if (slash)
			strbuf_add(&buf, cf->path, slash - cf->path + 1);
		strbuf_addstr(&buf, path);
		path = buf.buf;
	}

	if (!access_or_die(path, R_OK, 0)) {
		if (++inc->depth > MAX_INCLUDE_DEPTH)
			die(include_depth_advice, MAX_INCLUDE_DEPTH, path,
			    cf && cf->name ? cf->name : "the command line");
		ret = git_config_from_file(git_config_include, path, inc);
		inc->depth--;
	}
	strbuf_release(&buf);
	free(expanded);
	return ret;
}

int git_config_include(const char *var, const char *value, void *data)
{
	struct config_include_data *inc = data;
	int ret;

	/*
	 * Pass along all values, including "include" directives; this makes it
	 * possible to query information on the includes themselves.
	 */
	ret = inc->fn(var, value, inc->data);
	if (ret < 0)
		return ret;

	if (!strcmp(var, "include.path"))
		ret = handle_path_include(value, inc);
	return ret;
}

void git_config_push_parameter(const char *text)
{
	struct strbuf env = STRBUF_INIT;
	const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
	if (old) {
		strbuf_addstr(&env, old);
		strbuf_addch(&env, ' ');
	}
	sq_quote_buf(&env, text);
	setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
	strbuf_release(&env);
}

int git_config_parse_parameter(const char *text,
			       config_fn_t fn, void *data)
{
	const char *value;
	struct strbuf **pair;

	pair = strbuf_split_str(text, '=', 2);
	if (!pair[0])
		return error("bogus config parameter: %s", text);

	if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=') {
		strbuf_setlen(pair[0], pair[0]->len - 1);
		value = pair[1] ? pair[1]->buf : "";
	} else {
		value = NULL;
	}

	strbuf_trim(pair[0]);
	if (!pair[0]->len) {
		strbuf_list_free(pair);
		return error("bogus config parameter: %s", text);
	}
	strbuf_tolower(pair[0]);
	if (fn(pair[0]->buf, value, data) < 0) {
		strbuf_list_free(pair);
		return -1;
	}
	strbuf_list_free(pair);
	return 0;
}

int git_config_from_parameters(config_fn_t fn, void *data)
{
	const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
	char *envw;
	const char **argv = NULL;
	int nr = 0, alloc = 0;
	int i;

	if (!env)
		return 0;
	/* sq_dequote will write over it */
	envw = xstrdup(env);

	if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
		free(envw);
		return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
	}

	for (i = 0; i < nr; i++) {
		if (git_config_parse_parameter(argv[i], fn, data) < 0) {
			free(argv);
			free(envw);
			return -1;
		}
	}

	free(argv);
	free(envw);
	return nr > 0;
}

static int get_next_char(void)
{
	int c = cf->do_fgetc(cf);

	if (c == '\r') {
		/* DOS like systems */
		c = cf->do_fgetc(cf);
		if (c != '\n') {
			cf->do_ungetc(c, cf);
			c = '\r';
		}
	}
	if (c == '\n')
		cf->linenr++;
	if (c == EOF) {
		cf->eof = 1;
		cf->linenr++;
		c = '\n';
	}
	return c;
}

static char *parse_value(void)
{
	int quote = 0, comment = 0, space = 0;

	strbuf_reset(&cf->value);
	for (;;) {
		int c = get_next_char();
		if (c == '\n') {
			if (quote) {
				cf->linenr--;
				return NULL;
			}
			return cf->value.buf;
		}
		if (comment)
			continue;
		if (isspace(c) && !quote) {
			if (cf->value.len)
				space++;
			continue;
		}
		if (!quote) {
			if (c == ';' || c == '#') {
				comment = 1;
				continue;
			}
		}
		for (; space; space--)
			strbuf_addch(&cf->value, ' ');
		if (c == '\\') {
			c = get_next_char();
			switch (c) {
			case '\n':
				continue;
			case 't':
				c = '\t';
				break;
			case 'b':
				c = '\b';
				break;
			case 'n':
				c = '\n';
				break;
			/* Some characters escape as themselves */
			case '\\': case '"':
				break;
			/* Reject unknown escape sequences */
			default:
				return NULL;
			}
			strbuf_addch(&cf->value, c);
			continue;
		}
		if (c == '"') {
			quote = 1-quote;
			continue;
		}
		strbuf_addch(&cf->value, c);
	}
}

static inline int iskeychar(int c)
{
	return isalnum(c) || c == '-';
}

static int get_value(config_fn_t fn, void *data, struct strbuf *name)
{
	int c;
	char *value;
	int ret;

	/* Get the full name */
	for (;;) {
		c = get_next_char();
		if (cf->eof)
			break;
		if (!iskeychar(c))
			break;
		strbuf_addch(name, tolower(c));
	}

	while (c == ' ' || c == '\t')
		c = get_next_char();

	value = NULL;
	if (c != '\n') {
		if (c != '=')
			return -1;
		value = parse_value();
		if (!value)
			return -1;
	}
	/*
	 * We already consumed the \n, but we need linenr to point to
	 * the line we just parsed during the call to fn to get
	 * accurate line number in error messages.
	 */
	cf->linenr--;
	ret = fn(name->buf, value, data);
	cf->linenr++;
	return ret;
}

static int get_extended_base_var(struct strbuf *name, int c)
{
	do {
		if (c == '\n')
			goto error_incomplete_line;
		c = get_next_char();
	} while (isspace(c));

	/* We require the format to be '[base "extension"]' */
	if (c != '"')
		return -1;
	strbuf_addch(name, '.');

	for (;;) {
		int c = get_next_char();
		if (c == '\n')
			goto error_incomplete_line;
		if (c == '"')
			break;
		if (c == '\\') {
			c = get_next_char();
			if (c == '\n')
				goto error_incomplete_line;
		}
		strbuf_addch(name, c);
	}

	/* Final ']' */
	if (get_next_char() != ']')
		return -1;
	return 0;
error_incomplete_line:
	cf->linenr--;
	return -1;
}

static int get_base_var(struct strbuf *name)
{
	for (;;) {
		int c = get_next_char();
		if (cf->eof)
			return -1;
		if (c == ']')
			return 0;
		if (isspace(c))
			return get_extended_base_var(name, c);
		if (!iskeychar(c) && c != '.')
			return -1;
		strbuf_addch(name, tolower(c));
	}
}

static int git_parse_source(config_fn_t fn, void *data)
{
	int comment = 0;
	int baselen = 0;
	struct strbuf *var = &cf->var;

	/* U+FEFF Byte Order Mark in UTF8 */
	static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
	const unsigned char *bomptr = utf8_bom;

	for (;;) {
		int c = get_next_char();
		if (bomptr && *bomptr) {
			/* We are at the file beginning; skip UTF8-encoded BOM
			 * if present. Sane editors won't put this in on their
			 * own, but e.g. Windows Notepad will do it happily. */
			if ((unsigned char) c == *bomptr) {
				bomptr++;
				continue;
			} else {
				/* Do not tolerate partial BOM. */
				if (bomptr != utf8_bom)
					break;
				/* No BOM at file beginning. Cool. */
				bomptr = NULL;
			}
		}
		if (c == '\n') {
			if (cf->eof)
				return 0;
			comment = 0;
			continue;
		}
		if (comment || isspace(c))
			continue;
		if (c == '#' || c == ';') {
			comment = 1;
			continue;
		}
		if (c == '[') {
			/* Reset prior to determining a new stem */
			strbuf_reset(var);
			if (get_base_var(var) < 0 || var->len < 1)
				break;
			strbuf_addch(var, '.');
			baselen = var->len;
			continue;
		}
		if (!isalpha(c))
			break;
		/*
		 * Truncate the var name back to the section header
		 * stem prior to grabbing the suffix part of the name
		 * and the value.
		 */
		strbuf_setlen(var, baselen);
		strbuf_addch(var, tolower(c));
		if (get_value(fn, data, var) < 0)
			break;
	}
	if (cf->die_on_error)
		die(_("bad config file line %d in %s"), cf->linenr, cf->name);
	else
		return error(_("bad config file line %d in %s"), cf->linenr, cf->name);
}

static int parse_unit_factor(const char *end, uintmax_t *val)
{
	if (!*end)
		return 1;
	else if (!strcasecmp(end, "k")) {
		*val *= 1024;
		return 1;
	}
	else if (!strcasecmp(end, "m")) {
		*val *= 1024 * 1024;
		return 1;
	}
	else if (!strcasecmp(end, "g")) {
		*val *= 1024 * 1024 * 1024;
		return 1;
	}
	return 0;
}

static int git_parse_signed(const char *value, intmax_t *ret, intmax_t max)
{
	if (value && *value) {
		char *end;
		intmax_t val;
		uintmax_t uval;
		uintmax_t factor = 1;

		errno = 0;
		val = strtoimax(value, &end, 0);
		if (errno == ERANGE)
			return 0;
		if (!parse_unit_factor(end, &factor)) {
			errno = EINVAL;
			return 0;
		}
		uval = labs(val);
		uval *= factor;
		if (uval > max || labs(val) > uval) {
			errno = ERANGE;
			return 0;
		}
		val *= factor;
		*ret = val;
		return 1;
	}
	errno = EINVAL;
	return 0;
}

static int git_parse_unsigned(const char *value, uintmax_t *ret, uintmax_t max)
{
	if (value && *value) {
		char *end;
		uintmax_t val;
		uintmax_t oldval;

		errno = 0;
		val = strtoumax(value, &end, 0);
		if (errno == ERANGE)
			return 0;
		oldval = val;
		if (!parse_unit_factor(end, &val)) {
			errno = EINVAL;
			return 0;
		}
		if (val > max || oldval > val) {
			errno = ERANGE;
			return 0;
		}
		*ret = val;
		return 1;
	}
	errno = EINVAL;
	return 0;
}

static int git_parse_int(const char *value, int *ret)
{
	intmax_t tmp;
	if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int)))
		return 0;
	*ret = tmp;
	return 1;
}

static int git_parse_int64(const char *value, int64_t *ret)
{
	intmax_t tmp;
	if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int64_t)))
		return 0;
	*ret = tmp;
	return 1;
}

int git_parse_ulong(const char *value, unsigned long *ret)
{
	uintmax_t tmp;
	if (!git_parse_unsigned(value, &tmp, maximum_unsigned_value_of_type(long)))
		return 0;
	*ret = tmp;
	return 1;
}

NORETURN
static void die_bad_number(const char *name, const char *value)
{
	const char *reason = errno == ERANGE ?
			     "out of range" :
			     "invalid unit";
	if (!value)
		value = "";

	if (cf && cf->name)
		die(_("bad numeric config value '%s' for '%s' in %s: %s"),
		    value, name, cf->name, reason);
	die(_("bad numeric config value '%s' for '%s': %s"), value, name, reason);
}

int git_config_int(const char *name, const char *value)
{
	int ret;
	if (!git_parse_int(value, &ret))
		die_bad_number(name, value);
	return ret;
}

int64_t git_config_int64(const char *name, const char *value)
{
	int64_t ret;
	if (!git_parse_int64(value, &ret))
		die_bad_number(name, value);
	return ret;
}

unsigned long git_config_ulong(const char *name, const char *value)
{
	unsigned long ret;
	if (!git_parse_ulong(value, &ret))
		die_bad_number(name, value);
	return ret;
}

static int git_config_maybe_bool_text(const char *name, const char *value)
{
	if (!value)
		return 1;
	if (!*value)
		return 0;
	if (!strcasecmp(value, "true")
	    || !strcasecmp(value, "yes")
	    || !strcasecmp(value, "on"))
		return 1;
	if (!strcasecmp(value, "false")
	    || !strcasecmp(value, "no")
	    || !strcasecmp(value, "off"))
		return 0;
	return -1;
}

int git_config_maybe_bool(const char *name, const char *value)
{
	int v = git_config_maybe_bool_text(name, value);
	if (0 <= v)
		return v;
	if (git_parse_int(value, &v))
		return !!v;
	return -1;
}

int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
{
	int v = git_config_maybe_bool_text(name, value);
	if (0 <= v) {
		*is_bool = 1;
		return v;
	}
	*is_bool = 0;
	return git_config_int(name, value);
}

int git_config_bool(const char *name, const char *value)
{
	int discard;
	return !!git_config_bool_or_int(name, value, &discard);
}

int git_config_string(const char **dest, const char *var, const char *value)
{
	if (!value)
		return config_error_nonbool(var);
	*dest = xstrdup(value);
	return 0;
}

int git_config_pathname(const char **dest, const char *var, const char *value)
{
	if (!value)
		return config_error_nonbool(var);
	*dest = expand_user_path(value);
	if (!*dest)
		die(_("failed to expand user dir in: '%s'"), value);
	return 0;
}

static int git_default_core_config(const char *var, const char *value)
{
	/* This needs a better name */
	if (!strcmp(var, "core.filemode")) {
		trust_executable_bit = git_config_bool(var, value);
		return 0;
	}
	if (!strcmp(var, "core.trustctime")) {
		trust_ctime = git_config_bool(var, value);
		return 0;
	}
	if (!strcmp(var, "core.checkstat")) {
		if (!strcasecmp(value, "default"))
			check_stat = 1;
		else if (!strcasecmp(value, "minimal"))
			check_stat = 0;
	}

	if (!strcmp(var, "core.quotepath")) {
		quote_path_fully = git_config_bool(var, value);
		return 0;
	}

	if (!strcmp(var, "core.symlinks")) {
		has_symlinks = git_config_bool(var, value);
		return 0;
	}

	if (!strcmp(var, "core.ignorecase")) {
		ignore_case = git_config_bool(var, value);
		return 0;
	}

	if (!strcmp(var, "core.attributesfile"))
		return git_config_pathname(&git_attributes_file, var, value);

	if (!strcmp(var, "core.bare")) {
		is_bare_repository_cfg = git_config_bool(var, value);
		return 0;
	}

	if (!strcmp(var, "core.ignorestat")) {
		assume_unchanged = git_config_bool(var, value);
		return 0;
	}

	if (!strcmp(var, "core.prefersymlinkrefs")) {
		prefer_symlink_refs = git_config_bool(var, value);
		return 0;
	}

	if (!strcmp(var, "core.logallrefupdates")) {
		log_all_ref_updates = git_config_bool(var, value);
		return 0;
	}

	if (!strcmp(var, "core.warnambiguousrefs")) {
		warn_ambiguous_refs = git_config_bool(var, value);
		return 0;
	}

	if (!strcmp(var, "core.abbrev")) {
		int abbrev = git_config_int(var, value);
		if (abbrev < minimum_abbrev || abbrev > 40)
			return -1;
		default_abbrev = abbrev;
		return 0;
	}

	if (!strcmp(var, "core.loosecompression")) {
		int level = git_config_int(var, value);
		if (level == -1)
			level = Z_DEFAULT_COMPRESSION;
		else if (level < 0 || level > Z_BEST_COMPRESSION)
			die(_("bad zlib compression level %d"), level);
		zlib_compression_level = level;
		zlib_compression_seen = 1;
		return 0;
	}

	if (!strcmp(var, "core.compression")) {
		int level = git_config_int(var, value);
		if (level == -1)
			level = Z_DEFAULT_COMPRESSION;
		else if (level < 0 || level > Z_BEST_COMPRESSION)
			die(_("bad zlib compression level %d"), level);
		core_compression_level = level;
		core_compression_seen = 1;
		if (!zlib_compression_seen)
			zlib_compression_level = level;
		return 0;
	}

	if (!strcmp(var, "core.packedgitwindowsize")) {
		int pgsz_x2 = getpagesize() * 2;
		packed_git_window_size = git_config_ulong(var, value);

		/* This value must be multiple of (pagesize * 2) */
		packed_git_window_size /= pgsz_x2;
		if (packed_git_window_size < 1)
			packed_git_window_size = 1;
		packed_git_window_size *= pgsz_x2;
		return 0;
	}

	if (!strcmp(var, "core.bigfilethreshold")) {
		big_file_threshold = git_config_ulong(var, value);
		return 0;
	}

	if (!strcmp(var, "core.packedgitlimit")) {
		packed_git_limit = git_config_ulong(var, value);
		return 0;
	}

	if (!strcmp(var, "core.deltabasecachelimit")) {
		delta_base_cache_limit = git_config_ulong(var, value);
		return 0;
	}

	if (!strcmp(var, "core.autocrlf")) {
		if (value && !strcasecmp(value, "input")) {
			if (core_eol == EOL_CRLF)
				return error("core.autocrlf=input conflicts with core.eol=crlf");
			auto_crlf = AUTO_CRLF_INPUT;
			return 0;
		}
		auto_crlf = git_config_bool(var, value);
		return 0;
	}

	if (!strcmp(var, "core.safecrlf")) {
		if (value && !strcasecmp(value, "warn")) {
			safe_crlf = SAFE_CRLF_WARN;
			return 0;
		}
		safe_crlf = git_config_bool(var, value);
		return 0;
	}

	if (!strcmp(var, "core.eol")) {
		if (value && !strcasecmp(value, "lf"))
			core_eol = EOL_LF;
		else if (value && !strcasecmp(value, "crlf"))
			core_eol = EOL_CRLF;
		else if (value && !strcasecmp(value, "native"))
			core_eol = EOL_NATIVE;
		else
			core_eol = EOL_UNSET;
		if (core_eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
			return error("core.autocrlf=input conflicts with core.eol=crlf");
		return 0;
	}

	if (!strcmp(var, "core.notesref")) {
		notes_ref_name = xstrdup(value);
		return 0;
	}

	if (!strcmp(var, "core.pager"))
		return git_config_string(&pager_program, var, value);

	if (!strcmp(var, "core.editor"))
		return git_config_string(&editor_program, var, value);

	if (!strcmp(var, "core.commentchar")) {
		if (!value)
			return config_error_nonbool(var);
		else if (!strcasecmp(value, "auto"))
			auto_comment_line_char = 1;
		else if (value[0] && !value[1]) {
			comment_line_char = value[0];
			auto_comment_line_char = 0;
		} else
			return error("core.commentChar should only be one character");
		return 0;
	}

	if (!strcmp(var, "core.askpass"))
		return git_config_string(&askpass_program, var, value);

	if (!strcmp(var, "core.excludesfile"))
		return git_config_pathname(&excludes_file, var, value);

	if (!strcmp(var, "core.whitespace")) {
		if (!value)
			return config_error_nonbool(var);
		whitespace_rule_cfg = parse_whitespace_rule(value);
		return 0;
	}

	if (!strcmp(var, "core.fsyncobjectfiles")) {
		fsync_object_files = git_config_bool(var, value);
		return 0;
	}

	if (!strcmp(var, "core.preloadindex")) {
		core_preload_index = git_config_bool(var, value);
		return 0;
	}

	if (!strcmp(var, "core.createobject")) {
		if (!strcmp(value, "rename"))
			object_creation_mode = OBJECT_CREATION_USES_RENAMES;
		else if (!strcmp(value, "link"))
			object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
		else
			die(_("invalid mode for object creation: %s"), value);
		return 0;
	}

	if (!strcmp(var, "core.sparsecheckout")) {
		core_apply_sparse_checkout = git_config_bool(var, value);
		return 0;
	}

	if (!strcmp(var, "core.precomposeunicode")) {
		precomposed_unicode = git_config_bool(var, value);
		return 0;
	}

	if (!strcmp(var, "core.protecthfs")) {
		protect_hfs = git_config_bool(var, value);
		return 0;
	}

	if (!strcmp(var, "core.protectntfs")) {
		protect_ntfs = git_config_bool(var, value);
		return 0;
	}

	/* Add other config variables here and to Documentation/config.txt. */
	return 0;
}

static int git_default_i18n_config(const char *var, const char *value)
{
	if (!strcmp(var, "i18n.commitencoding"))
		return git_config_string(&git_commit_encoding, var, value);

	if (!strcmp(var, "i18n.logoutputencoding"))
		return git_config_string(&git_log_output_encoding, var, value);

	/* Add other config variables here and to Documentation/config.txt. */
	return 0;
}

static int git_default_branch_config(const char *var, const char *value)
{
	if (!strcmp(var, "branch.autosetupmerge")) {
		if (value && !strcasecmp(value, "always")) {
			git_branch_track = BRANCH_TRACK_ALWAYS;
			return 0;
		}
		git_branch_track = git_config_bool(var, value);
		return 0;
	}
	if (!strcmp(var, "branch.autosetuprebase")) {
		if (!value)
			return config_error_nonbool(var);
		else if (!strcmp(value, "never"))
			autorebase = AUTOREBASE_NEVER;
		else if (!strcmp(value, "local"))
			autorebase = AUTOREBASE_LOCAL;
		else if (!strcmp(value, "remote"))
			autorebase = AUTOREBASE_REMOTE;
		else if (!strcmp(value, "always"))
			autorebase = AUTOREBASE_ALWAYS;
		else
			return error("Malformed value for %s", var);
		return 0;
	}

	/* Add other config variables here and to Documentation/config.txt. */
	return 0;
}

static int git_default_push_config(const char *var, const char *value)
{
	if (!strcmp(var, "push.default")) {
		if (!value)
			return config_error_nonbool(var);
		else if (!strcmp(value, "nothing"))
			push_default = PUSH_DEFAULT_NOTHING;
		else if (!strcmp(value, "matching"))
			push_default = PUSH_DEFAULT_MATCHING;
		else if (!strcmp(value, "simple"))
			push_default = PUSH_DEFAULT_SIMPLE;
		else if (!strcmp(value, "upstream"))
			push_default = PUSH_DEFAULT_UPSTREAM;
		else if (!strcmp(value, "tracking")) /* deprecated */
			push_default = PUSH_DEFAULT_UPSTREAM;
		else if (!strcmp(value, "current"))
			push_default = PUSH_DEFAULT_CURRENT;
		else {
			error("Malformed value for %s: %s", var, value);
			return error("Must be one of nothing, matching, simple, "
				     "upstream or current.");
		}
		return 0;
	}

	/* Add other config variables here and to Documentation/config.txt. */
	return 0;
}

static int git_default_mailmap_config(const char *var, const char *value)
{
	if (!strcmp(var, "mailmap.file"))
		return git_config_pathname(&git_mailmap_file, var, value);
	if (!strcmp(var, "mailmap.blob"))
		return git_config_string(&git_mailmap_blob, var, value);

	/* Add other config variables here and to Documentation/config.txt. */
	return 0;
}

int git_default_config(const char *var, const char *value, void *dummy)
{
	if (starts_with(var, "core."))
		return git_default_core_config(var, value);

	if (starts_with(var, "user."))
		return git_ident_config(var, value, dummy);

	if (starts_with(var, "i18n."))
		return git_default_i18n_config(var, value);

	if (starts_with(var, "branch."))
		return git_default_branch_config(var, value);

	if (starts_with(var, "push."))
		return git_default_push_config(var, value);

	if (starts_with(var, "mailmap."))
		return git_default_mailmap_config(var, value);

	if (starts_with(var, "advice."))
		return git_default_advice_config(var, value);

	if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
		pager_use_color = git_config_bool(var,value);
		return 0;
	}

	if (!strcmp(var, "pack.packsizelimit")) {
		pack_size_limit_cfg = git_config_ulong(var, value);
		return 0;
	}
	/* Add other config variables here and to Documentation/config.txt. */
	return 0;
}

/*
 * All source specific fields in the union, die_on_error, name and the callbacks
 * fgetc, ungetc, ftell of top need to be initialized before calling
 * this function.
 */
static int do_config_from(struct config_source *top, config_fn_t fn, void *data)
{
	int ret;

	/* push config-file parsing state stack */
	top->prev = cf;
	top->linenr = 1;
	top->eof = 0;
	strbuf_init(&top->value, 1024);
	strbuf_init(&top->var, 1024);
	cf = top;

	ret = git_parse_source(fn, data);

	/* pop config-file parsing state stack */
	strbuf_release(&top->value);
	strbuf_release(&top->var);
	cf = top->prev;

	return ret;
}

static int do_config_from_file(config_fn_t fn,
		const char *name, const char *path, FILE *f, void *data)
{
	struct config_source top;

	top.u.file = f;
	top.name = name;
	top.path = path;
	top.die_on_error = 1;
	top.do_fgetc = config_file_fgetc;
	top.do_ungetc = config_file_ungetc;
	top.do_ftell = config_file_ftell;

	return do_config_from(&top, fn, data);
}

static int git_config_from_stdin(config_fn_t fn, void *data)
{
	return do_config_from_file(fn, "<stdin>", NULL, stdin, data);
}

int git_config_from_file(config_fn_t fn, const char *filename, void *data)
{
	int ret = -1;
	FILE *f;

	f = fopen(filename, "r");
	if (f) {
		ret = do_config_from_file(fn, filename, filename, f, data);
		fclose(f);
	}
	return ret;
}

int git_config_from_buf(config_fn_t fn, const char *name, const char *buf,
			size_t len, void *data)
{
	struct config_source top;

	top.u.buf.buf = buf;
	top.u.buf.len = len;
	top.u.buf.pos = 0;
	top.name = name;
	top.path = NULL;
	top.die_on_error = 0;
	top.do_fgetc = config_buf_fgetc;
	top.do_ungetc = config_buf_ungetc;
	top.do_ftell = config_buf_ftell;

	return do_config_from(&top, fn, data);
}

static int git_config_from_blob_sha1(config_fn_t fn,
				     const char *name,
				     const unsigned char *sha1,
				     void *data)
{
	enum object_type type;
	char *buf;
	unsigned long size;
	int ret;

	buf = read_sha1_file(sha1, &type, &size);
	if (!buf)
		return error("unable to load config blob object '%s'", name);
	if (type != OBJ_BLOB) {
		free(buf);
		return error("reference '%s' does not point to a blob", name);
	}

	ret = git_config_from_buf(fn, name, buf, size, data);
	free(buf);

	return ret;
}

static int git_config_from_blob_ref(config_fn_t fn,
				    const char *name,
				    void *data)
{
	unsigned char sha1[20];

	if (get_sha1(name, sha1) < 0)
		return error("unable to resolve config blob '%s'", name);
	return git_config_from_blob_sha1(fn, name, sha1, data);
}

const char *git_etc_gitconfig(void)
{
	static const char *system_wide;
	if (!system_wide)
		system_wide = system_path(ETC_GITCONFIG);
	return system_wide;
}

/*
 * Parse environment variable 'k' as a boolean (in various
 * possible spellings); if missing, use the default value 'def'.
 */
int git_env_bool(const char *k, int def)
{
	const char *v = getenv(k);
	return v ? git_config_bool(k, v) : def;
}

/*
 * Parse environment variable 'k' as ulong with possibly a unit
 * suffix; if missing, use the default value 'val'.
 */
unsigned long git_env_ulong(const char *k, unsigned long val)
{
	const char *v = getenv(k);
	if (v && !git_parse_ulong(v, &val))
		die("failed to parse %s", k);
	return val;
}

int git_config_system(void)
{
	return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
}

int git_config_early(config_fn_t fn, void *data, const char *repo_config)
{
	int ret = 0, found = 0;
	char *xdg_config = NULL;
	char *user_config = NULL;

	home_config_paths(&user_config, &xdg_config, "config");

	if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK, 0)) {
		ret += git_config_from_file(fn, git_etc_gitconfig(),
					    data);
		found += 1;
	}

	if (xdg_config && !access_or_die(xdg_config, R_OK, ACCESS_EACCES_OK)) {
		ret += git_config_from_file(fn, xdg_config, data);
		found += 1;
	}

	if (user_config && !access_or_die(user_config, R_OK, ACCESS_EACCES_OK)) {
		ret += git_config_from_file(fn, user_config, data);
		found += 1;
	}

	if (repo_config && !access_or_die(repo_config, R_OK, 0)) {
		ret += git_config_from_file(fn, repo_config, data);
		found += 1;
	}

	switch (git_config_from_parameters(fn, data)) {
	case -1: /* error */
		die(_("unable to parse command-line config"));
		break;
	case 0: /* found nothing */
		break;
	default: /* found at least one item */
		found++;
		break;
	}

	free(xdg_config);
	free(user_config);
	return ret == 0 ? found : ret;
}

int git_config_with_options(config_fn_t fn, void *data,
			    struct git_config_source *config_source,
			    int respect_includes)
{
	char *repo_config = NULL;
	int ret;
	struct config_include_data inc = CONFIG_INCLUDE_INIT;

	if (respect_includes) {
		inc.fn = fn;
		inc.data = data;
		fn = git_config_include;
		data = &inc;
	}

	/*
	 * If we have a specific filename, use it. Otherwise, follow the
	 * regular lookup sequence.
	 */
	if (config_source && config_source->use_stdin)
		return git_config_from_stdin(fn, data);
	else if (config_source && config_source->file)
		return git_config_from_file(fn, config_source->file, data);
	else if (config_source && config_source->blob)
		return git_config_from_blob_ref(fn, config_source->blob, data);

	repo_config = git_pathdup("config");
	ret = git_config_early(fn, data, repo_config);
	if (repo_config)
		free(repo_config);
	return ret;
}

static void git_config_raw(config_fn_t fn, void *data)
{
	if (git_config_with_options(fn, data, NULL, 1) < 0)
		/*
		 * git_config_with_options() normally returns only
		 * positive values, as most errors are fatal, and
		 * non-fatal potential errors are guarded by "if"
		 * statements that are entered only when no error is
		 * possible.
		 *
		 * If we ever encounter a non-fatal error, it means
		 * something went really wrong and we should stop
		 * immediately.
		 */
		die(_("unknown error occured while reading the configuration files"));
}

static void configset_iter(struct config_set *cs, config_fn_t fn, void *data)
{
	int i, value_index;
	struct string_list *values;
	struct config_set_element *entry;
	struct configset_list *list = &cs->list;
	struct key_value_info *kv_info;

	for (i = 0; i < list->nr; i++) {
		entry = list->items[i].e;
		value_index = list->items[i].value_index;
		values = &entry->value_list;
		if (fn(entry->key, values->items[value_index].string, data) < 0) {
			kv_info = values->items[value_index].util;
			git_die_config_linenr(entry->key, kv_info->filename, kv_info->linenr);
		}
	}
}

static void git_config_check_init(void);

void git_config(config_fn_t fn, void *data)
{
	git_config_check_init();
	configset_iter(&the_config_set, fn, data);
}

static struct config_set_element *configset_find_element(struct config_set *cs, const char *key)
{
	struct config_set_element k;
	struct config_set_element *found_entry;
	char *normalized_key;
	int ret;
	/*
	 * `key` may come from the user, so normalize it before using it
	 * for querying entries from the hashmap.
	 */
	ret = git_config_parse_key(key, &normalized_key, NULL);

	if (ret)
		return NULL;

	hashmap_entry_init(&k, strhash(normalized_key));
	k.key = normalized_key;
	found_entry = hashmap_get(&cs->config_hash, &k, NULL);
	free(normalized_key);
	return found_entry;
}

static int configset_add_value(struct config_set *cs, const char *key, const char *value)
{
	struct config_set_element *e;
	struct string_list_item *si;
	struct configset_list_item *l_item;
	struct key_value_info *kv_info = xmalloc(sizeof(*kv_info));

	e = configset_find_element(cs, key);
	/*
	 * Since the keys are being fed by git_config*() callback mechanism, they
	 * are already normalized. So simply add them without any further munging.
	 */
	if (!e) {
		e = xmalloc(sizeof(*e));
		hashmap_entry_init(e, strhash(key));
		e->key = xstrdup(key);
		string_list_init(&e->value_list, 1);
		hashmap_add(&cs->config_hash, e);
	}
	si = string_list_append_nodup(&e->value_list, value ? xstrdup(value) : NULL);

	ALLOC_GROW(cs->list.items, cs->list.nr + 1, cs->list.alloc);
	l_item = &cs->list.items[cs->list.nr++];
	l_item->e = e;
	l_item->value_index = e->value_list.nr - 1;

	if (cf) {
		kv_info->filename = strintern(cf->name);
		kv_info->linenr = cf->linenr;
	} else {
		/* for values read from `git_config_from_parameters()` */
		kv_info->filename = NULL;
		kv_info->linenr = -1;
	}
	si->util = kv_info;

	return 0;
}

static int config_set_element_cmp(const struct config_set_element *e1,
				 const struct config_set_element *e2, const void *unused)
{
	return strcmp(e1->key, e2->key);
}

void git_configset_init(struct config_set *cs)
{
	hashmap_init(&cs->config_hash, (hashmap_cmp_fn)config_set_element_cmp, 0);
	cs->hash_initialized = 1;
	cs->list.nr = 0;
	cs->list.alloc = 0;
	cs->list.items = NULL;
}

void git_configset_clear(struct config_set *cs)
{
	struct config_set_element *entry;
	struct hashmap_iter iter;
	if (!cs->hash_initialized)
		return;

	hashmap_iter_init(&cs->config_hash, &iter);
	while ((entry = hashmap_iter_next(&iter))) {
		free(entry->key);
		string_list_clear(&entry->value_list, 1);
	}
	hashmap_free(&cs->config_hash, 1);
	cs->hash_initialized = 0;
	free(cs->list.items);
	cs->list.nr = 0;
	cs->list.alloc = 0;
	cs->list.items = NULL;
}

static int config_set_callback(const char *key, const char *value, void *cb)
{
	struct config_set *cs = cb;
	configset_add_value(cs, key, value);
	return 0;
}

int git_configset_add_file(struct config_set *cs, const char *filename)
{
	return git_config_from_file(config_set_callback, filename, cs);
}

int git_configset_get_value(struct config_set *cs, const char *key, const char **value)
{
	const struct string_list *values = NULL;
	/*
	 * Follows "last one wins" semantic, i.e., if there are multiple matches for the
	 * queried key in the files of the configset, the value returned will be the last
	 * value in the value list for that key.
	 */
	values = git_configset_get_value_multi(cs, key);

	if (!values)
		return 1;
	assert(values->nr > 0);
	*value = values->items[values->nr - 1].string;
	return 0;
}

const struct string_list *git_configset_get_value_multi(struct config_set *cs, const char *key)
{
	struct config_set_element *e = configset_find_element(cs, key);
	return e ? &e->value_list : NULL;
}

int git_configset_get_string_const(struct config_set *cs, const char *key, const char **dest)
{
	const char *value;
	if (!git_configset_get_value(cs, key, &value))
		return git_config_string(dest, key, value);
	else
		return 1;
}

int git_configset_get_string(struct config_set *cs, const char *key, char **dest)
{
	return git_configset_get_string_const(cs, key, (const char **)dest);
}

int git_configset_get_int(struct config_set *cs, const char *key, int *dest)
{
	const char *value;
	if (!git_configset_get_value(cs, key, &value)) {
		*dest = git_config_int(key, value);
		return 0;
	} else
		return 1;
}

int git_configset_get_ulong(struct config_set *cs, const char *key, unsigned long *dest)
{
	const char *value;
	if (!git_configset_get_value(cs, key, &value)) {
		*dest = git_config_ulong(key, value);
		return 0;
	} else
		return 1;
}

int git_configset_get_bool(struct config_set *cs, const char *key, int *dest)
{
	const char *value;
	if (!git_configset_get_value(cs, key, &value)) {
		*dest = git_config_bool(key, value);
		return 0;
	} else
		return 1;
}

int git_configset_get_bool_or_int(struct config_set *cs, const char *key,
				int *is_bool, int *dest)
{
	const char *value;
	if (!git_configset_get_value(cs, key, &value)) {
		*dest = git_config_bool_or_int(key, value, is_bool);
		return 0;
	} else
		return 1;
}

int git_configset_get_maybe_bool(struct config_set *cs, const char *key, int *dest)
{
	const char *value;
	if (!git_configset_get_value(cs, key, &value)) {
		*dest = git_config_maybe_bool(key, value);
		if (*dest == -1)
			return -1;
		return 0;
	} else
		return 1;
}

int git_configset_get_pathname(struct config_set *cs, const char *key, const char **dest)
{
	const char *value;
	if (!git_configset_get_value(cs, key, &value))
		return git_config_pathname(dest, key, value);
	else
		return 1;
}

static void git_config_check_init(void)
{
	if (the_config_set.hash_initialized)
		return;
	git_configset_init(&the_config_set);
	git_config_raw(config_set_callback, &the_config_set);
}

void git_config_clear(void)
{
	if (!the_config_set.hash_initialized)
		return;
	git_configset_clear(&the_config_set);
}

int git_config_get_value(const char *key, const char **value)
{
	git_config_check_init();
	return git_configset_get_value(&the_config_set, key, value);
}

const struct string_list *git_config_get_value_multi(const char *key)
{
	git_config_check_init();
	return git_configset_get_value_multi(&the_config_set, key);
}

int git_config_get_string_const(const char *key, const char **dest)
{
	int ret;
	git_config_check_init();
	ret = git_configset_get_string_const(&the_config_set, key, dest);
	if (ret < 0)
		git_die_config(key, NULL);
	return ret;
}

int git_config_get_string(const char *key, char **dest)
{
	git_config_check_init();
	return git_config_get_string_const(key, (const char **)dest);
}

int git_config_get_int(const char *key, int *dest)
{
	git_config_check_init();
	return git_configset_get_int(&the_config_set, key, dest);
}

int git_config_get_ulong(const char *key, unsigned long *dest)
{
	git_config_check_init();
	return git_configset_get_ulong(&the_config_set, key, dest);
}

int git_config_get_bool(const char *key, int *dest)
{
	git_config_check_init();
	return git_configset_get_bool(&the_config_set, key, dest);
}

int git_config_get_bool_or_int(const char *key, int *is_bool, int *dest)
{
	git_config_check_init();
	return git_configset_get_bool_or_int(&the_config_set, key, is_bool, dest);
}

int git_config_get_maybe_bool(const char *key, int *dest)
{
	git_config_check_init();
	return git_configset_get_maybe_bool(&the_config_set, key, dest);
}

int git_config_get_pathname(const char *key, const char **dest)
{
	int ret;
	git_config_check_init();
	ret = git_configset_get_pathname(&the_config_set, key, dest);
	if (ret < 0)
		git_die_config(key, NULL);
	return ret;
}

NORETURN
void git_die_config_linenr(const char *key, const char *filename, int linenr)
{
	if (!filename)
		die(_("unable to parse '%s' from command-line config"), key);
	else
		die(_("bad config variable '%s' in file '%s' at line %d"),
		    key, filename, linenr);
}

NORETURN __attribute__((format(printf, 2, 3)))
void git_die_config(const char *key, const char *err, ...)
{
	const struct string_list *values;
	struct key_value_info *kv_info;

	if (err) {
		va_list params;
		va_start(params, err);
		vreportf("error: ", err, params);
		va_end(params);
	}
	values = git_config_get_value_multi(key);
	kv_info = values->items[values->nr - 1].util;
	git_die_config_linenr(key, kv_info->filename, kv_info->linenr);
}

/*
 * Find all the stuff for git_config_set() below.
 */

static struct {
	int baselen;
	char *key;
	int do_not_match;
	regex_t *value_regex;
	int multi_replace;
	size_t *offset;
	unsigned int offset_alloc;
	enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
	int seen;
} store;

static int matches(const char *key, const char *value)
{
	if (strcmp(key, store.key))
		return 0; /* not ours */
	if (!store.value_regex)
		return 1; /* always matches */
	if (store.value_regex == CONFIG_REGEX_NONE)
		return 0; /* never matches */

	return store.do_not_match ^
		(value && !regexec(store.value_regex, value, 0, NULL, 0));
}

static int store_aux(const char *key, const char *value, void *cb)
{
	const char *ep;
	size_t section_len;

	switch (store.state) {
	case KEY_SEEN:
		if (matches(key, value)) {
			if (store.seen == 1 && store.multi_replace == 0) {
				warning(_("%s has multiple values"), key);
			}

			ALLOC_GROW(store.offset, store.seen + 1,
				   store.offset_alloc);

			store.offset[store.seen] = cf->do_ftell(cf);
			store.seen++;
		}
		break;
	case SECTION_SEEN:
		/*
		 * What we are looking for is in store.key (both
		 * section and var), and its section part is baselen
		 * long.  We found key (again, both section and var).
		 * We would want to know if this key is in the same
		 * section as what we are looking for.  We already
		 * know we are in the same section as what should
		 * hold store.key.
		 */
		ep = strrchr(key, '.');
		section_len = ep - key;

		if ((section_len != store.baselen) ||
		    memcmp(key, store.key, section_len+1)) {
			store.state = SECTION_END_SEEN;
			break;
		}

		/*
		 * Do not increment matches: this is no match, but we
		 * just made sure we are in the desired section.
		 */
		ALLOC_GROW(store.offset, store.seen + 1,
			   store.offset_alloc);
		store.offset[store.seen] = cf->do_ftell(cf);
		/* fallthru */
	case SECTION_END_SEEN:
	case START:
		if (matches(key, value)) {
			ALLOC_GROW(store.offset, store.seen + 1,
				   store.offset_alloc);
			store.offset[store.seen] = cf->do_ftell(cf);
			store.state = KEY_SEEN;
			store.seen++;
		} else {
			if (strrchr(key, '.') - key == store.baselen &&
			      !strncmp(key, store.key, store.baselen)) {
					store.state = SECTION_SEEN;
					ALLOC_GROW(store.offset,
						   store.seen + 1,
						   store.offset_alloc);
					store.offset[store.seen] = cf->do_ftell(cf);
			}
		}
	}
	return 0;
}

static int write_error(const char *filename)
{
	error("failed to write new configuration file %s", filename);

	/* Same error code as "failed to rename". */
	return 4;
}

static int store_write_section(int fd, const char *key)
{
	const char *dot;
	int i, success;
	struct strbuf sb = STRBUF_INIT;

	dot = memchr(key, '.', store.baselen);
	if (dot) {
		strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
		for (i = dot - key + 1; i < store.baselen; i++) {
			if (key[i] == '"' || key[i] == '\\')
				strbuf_addch(&sb, '\\');
			strbuf_addch(&sb, key[i]);
		}
		strbuf_addstr(&sb, "\"]\n");
	} else {
		strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
	}

	success = write_in_full(fd, sb.buf, sb.len) == sb.len;
	strbuf_release(&sb);

	return success;
}

static int store_write_pair(int fd, const char *key, const char *value)
{
	int i, success;
	int length = strlen(key + store.baselen + 1);
	const char *quote = "";
	struct strbuf sb = STRBUF_INIT;

	/*
	 * Check to see if the value needs to be surrounded with a dq pair.
	 * Note that problematic characters are always backslash-quoted; this
	 * check is about not losing leading or trailing SP and strings that
	 * follow beginning-of-comment characters (i.e. ';' and '#') by the
	 * configuration parser.
	 */
	if (value[0] == ' ')
		quote = "\"";
	for (i = 0; value[i]; i++)
		if (value[i] == ';' || value[i] == '#')
			quote = "\"";
	if (i && value[i - 1] == ' ')
		quote = "\"";

	strbuf_addf(&sb, "\t%.*s = %s",
		    length, key + store.baselen + 1, quote);

	for (i = 0; value[i]; i++)
		switch (value[i]) {
		case '\n':
			strbuf_addstr(&sb, "\\n");
			break;
		case '\t':
			strbuf_addstr(&sb, "\\t");
			break;
		case '"':
		case '\\':
			strbuf_addch(&sb, '\\');
		default:
			strbuf_addch(&sb, value[i]);
			break;
		}
	strbuf_addf(&sb, "%s\n", quote);

	success = write_in_full(fd, sb.buf, sb.len) == sb.len;
	strbuf_release(&sb);

	return success;
}

static ssize_t find_beginning_of_line(const char *contents, size_t size,
	size_t offset_, int *found_bracket)
{
	size_t equal_offset = size, bracket_offset = size;
	ssize_t offset;

contline:
	for (offset = offset_-2; offset > 0
			&& contents[offset] != '\n'; offset--)
		switch (contents[offset]) {
			case '=': equal_offset = offset; break;
			case ']': bracket_offset = offset; break;
		}
	if (offset > 0 && contents[offset-1] == '\\') {
		offset_ = offset;
		goto contline;
	}
	if (bracket_offset < equal_offset) {
		*found_bracket = 1;
		offset = bracket_offset+1;
	} else
		offset++;

	return offset;
}

int git_config_set_in_file(const char *config_filename,
			const char *key, const char *value)
{
	return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
}

int git_config_set(const char *key, const char *value)
{
	return git_config_set_multivar(key, value, NULL, 0);
}

/*
 * Auxiliary function to sanity-check and split the key into the section
 * identifier and variable name.
 *
 * Returns 0 on success, -1 when there is an invalid character in the key and
 * -2 if there is no section name in the key.
 *
 * store_key - pointer to char* which will hold a copy of the key with
 *             lowercase section and variable name
 * baselen - pointer to int which will hold the length of the
 *           section + subsection part, can be NULL
 */
int git_config_parse_key(const char *key, char **store_key, int *baselen_)
{
	int i, dot, baselen;
	const char *last_dot = strrchr(key, '.');

	/*
	 * Since "key" actually contains the section name and the real
	 * key name separated by a dot, we have to know where the dot is.
	 */

	if (last_dot == NULL || last_dot == key) {
		error("key does not contain a section: %s", key);
		return -CONFIG_NO_SECTION_OR_NAME;
	}

	if (!last_dot[1]) {
		error("key does not contain variable name: %s", key);
		return -CONFIG_NO_SECTION_OR_NAME;
	}

	baselen = last_dot - key;
	if (baselen_)
		*baselen_ = baselen;

	/*
	 * Validate the key and while at it, lower case it for matching.
	 */
	*store_key = xmalloc(strlen(key) + 1);

	dot = 0;
	for (i = 0; key[i]; i++) {
		unsigned char c = key[i];
		if (c == '.')
			dot = 1;
		/* Leave the extended basename untouched.. */
		if (!dot || i > baselen) {
			if (!iskeychar(c) ||
			    (i == baselen + 1 && !isalpha(c))) {
				error("invalid key: %s", key);
				goto out_free_ret_1;
			}
			c = tolower(c);
		} else if (c == '\n') {
			error("invalid key (newline): %s", key);
			goto out_free_ret_1;
		}
		(*store_key)[i] = c;
	}
	(*store_key)[i] = 0;

	return 0;

out_free_ret_1:
	free(*store_key);
	*store_key = NULL;
	return -CONFIG_INVALID_KEY;
}

/*
 * If value==NULL, unset in (remove from) config,
 * if value_regex!=NULL, disregard key/value pairs where value does not match.
 * if value_regex==CONFIG_REGEX_NONE, do not match any existing values
 *     (only add a new one)
 * if multi_replace==0, nothing, or only one matching key/value is replaced,
 *     else all matching key/values (regardless how many) are removed,
 *     before the new pair is written.
 *
 * Returns 0 on success.
 *
 * This function does this:
 *
 * - it locks the config file by creating ".git/config.lock"
 *
 * - it then parses the config using store_aux() as validator to find
 *   the position on the key/value pair to replace. If it is to be unset,
 *   it must be found exactly once.
 *
 * - the config file is mmap()ed and the part before the match (if any) is
 *   written to the lock file, then the changed part and the rest.
 *
 * - the config file is removed and the lock file rename()d to it.
 *
 */
int git_config_set_multivar_in_file(const char *config_filename,
				const char *key, const char *value,
				const char *value_regex, int multi_replace)
{
	int fd = -1, in_fd;
	int ret;
	struct lock_file *lock = NULL;
	char *filename_buf = NULL;

	/* parse-key returns negative; flip the sign to feed exit(3) */
	ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
	if (ret)
		goto out_free;

	store.multi_replace = multi_replace;

	if (!config_filename)
		config_filename = filename_buf = git_pathdup("config");

	/*
	 * The lock serves a purpose in addition to locking: the new
	 * contents of .git/config will be written into it.
	 */
	lock = xcalloc(1, sizeof(struct lock_file));
	fd = hold_lock_file_for_update(lock, config_filename, 0);
	if (fd < 0) {
		error("could not lock config file %s: %s", config_filename, strerror(errno));
		free(store.key);
		ret = CONFIG_NO_LOCK;
		goto out_free;
	}

	/*
	 * If .git/config does not exist yet, write a minimal version.
	 */
	in_fd = open(config_filename, O_RDONLY);
	if ( in_fd < 0 ) {
		free(store.key);

		if ( ENOENT != errno ) {
			error("opening %s: %s", config_filename,
			      strerror(errno));
			ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
			goto out_free;
		}
		/* if nothing to unset, error out */
		if (value == NULL) {
			ret = CONFIG_NOTHING_SET;
			goto out_free;
		}

		store.key = (char *)key;
		if (!store_write_section(fd, key) ||
		    !store_write_pair(fd, key, value))
			goto write_err_out;
	} else {
		struct stat st;
		char *contents;
		size_t contents_sz, copy_begin, copy_end;
		int i, new_line = 0;

		if (value_regex == NULL)
			store.value_regex = NULL;
		else if (value_regex == CONFIG_REGEX_NONE)
			store.value_regex = CONFIG_REGEX_NONE;
		else {
			if (value_regex[0] == '!') {
				store.do_not_match = 1;
				value_regex++;
			} else
				store.do_not_match = 0;

			store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
			if (regcomp(store.value_regex, value_regex,
					REG_EXTENDED)) {
				error("invalid pattern: %s", value_regex);
				free(store.value_regex);
				ret = CONFIG_INVALID_PATTERN;
				goto out_free;
			}
		}

		ALLOC_GROW(store.offset, 1, store.offset_alloc);
		store.offset[0] = 0;
		store.state = START;
		store.seen = 0;

		/*
		 * After this, store.offset will contain the *end* offset
		 * of the last match, or remain at 0 if no match was found.
		 * As a side effect, we make sure to transform only a valid
		 * existing config file.
		 */
		if (git_config_from_file(store_aux, config_filename, NULL)) {
			error("invalid config file %s", config_filename);
			free(store.key);
			if (store.value_regex != NULL &&
			    store.value_regex != CONFIG_REGEX_NONE) {
				regfree(store.value_regex);
				free(store.value_regex);
			}
			ret = CONFIG_INVALID_FILE;
			goto out_free;
		}

		free(store.key);
		if (store.value_regex != NULL &&
		    store.value_regex != CONFIG_REGEX_NONE) {
			regfree(store.value_regex);
			free(store.value_regex);
		}

		/* if nothing to unset, or too many matches, error out */
		if ((store.seen == 0 && value == NULL) ||
				(store.seen > 1 && multi_replace == 0)) {
			ret = CONFIG_NOTHING_SET;
			goto out_free;
		}

		fstat(in_fd, &st);
		contents_sz = xsize_t(st.st_size);
		contents = xmmap(NULL, contents_sz, PROT_READ,
			MAP_PRIVATE, in_fd, 0);
		close(in_fd);

		if (chmod(lock->filename.buf, st.st_mode & 07777) < 0) {
			error("chmod on %s failed: %s",
				lock->filename.buf, strerror(errno));
			ret = CONFIG_NO_WRITE;
			goto out_free;
		}

		if (store.seen == 0)
			store.seen = 1;

		for (i = 0, copy_begin = 0; i < store.seen; i++) {
			if (store.offset[i] == 0) {
				store.offset[i] = copy_end = contents_sz;
			} else if (store.state != KEY_SEEN) {
				copy_end = store.offset[i];
			} else
				copy_end = find_beginning_of_line(
					contents, contents_sz,
					store.offset[i]-2, &new_line);

			if (copy_end > 0 && contents[copy_end-1] != '\n')
				new_line = 1;

			/* write the first part of the config */
			if (copy_end > copy_begin) {
				if (write_in_full(fd, contents + copy_begin,
						  copy_end - copy_begin) <
				    copy_end - copy_begin)
					goto write_err_out;
				if (new_line &&
				    write_str_in_full(fd, "\n") != 1)
					goto write_err_out;
			}
			copy_begin = store.offset[i];
		}

		/* write the pair (value == NULL means unset) */
		if (value != NULL) {
			if (store.state == START) {
				if (!store_write_section(fd, key))
					goto write_err_out;
			}
			if (!store_write_pair(fd, key, value))
				goto write_err_out;
		}

		/* write the rest of the config */
		if (copy_begin < contents_sz)
			if (write_in_full(fd, contents + copy_begin,
					  contents_sz - copy_begin) <
			    contents_sz - copy_begin)
				goto write_err_out;

		munmap(contents, contents_sz);
	}

	if (commit_lock_file(lock) < 0) {
		error("could not commit config file %s", config_filename);
		ret = CONFIG_NO_WRITE;
		lock = NULL;
		goto out_free;
	}

	/*
	 * lock is committed, so don't try to roll it back below.
	 * NOTE: Since lockfile.c keeps a linked list of all created
	 * lock_file structures, it isn't safe to free(lock).  It's
	 * better to just leave it hanging around.
	 */
	lock = NULL;
	ret = 0;

	/* Invalidate the config cache */
	git_config_clear();

out_free:
	if (lock)
		rollback_lock_file(lock);
	free(filename_buf);
	return ret;

write_err_out:
	ret = write_error(lock->filename.buf);
	goto out_free;

}

int git_config_set_multivar(const char *key, const char *value,
			const char *value_regex, int multi_replace)
{
	return git_config_set_multivar_in_file(NULL, key, value, value_regex,
					       multi_replace);
}

static int section_name_match (const char *buf, const char *name)
{
	int i = 0, j = 0, dot = 0;
	if (buf[i] != '[')
		return 0;
	for (i = 1; buf[i] && buf[i] != ']'; i++) {
		if (!dot && isspace(buf[i])) {
			dot = 1;
			if (name[j++] != '.')
				break;
			for (i++; isspace(buf[i]); i++)
				; /* do nothing */
			if (buf[i] != '"')
				break;
			continue;
		}
		if (buf[i] == '\\' && dot)
			i++;
		else if (buf[i] == '"' && dot) {
			for (i++; isspace(buf[i]); i++)
				; /* do_nothing */
			break;
		}
		if (buf[i] != name[j++])
			break;
	}
	if (buf[i] == ']' && name[j] == 0) {
		/*
		 * We match, now just find the right length offset by
		 * gobbling up any whitespace after it, as well
		 */
		i++;
		for (; buf[i] && isspace(buf[i]); i++)
			; /* do nothing */
		return i;
	}
	return 0;
}

static int section_name_is_ok(const char *name)
{
	/* Empty section names are bogus. */
	if (!*name)
		return 0;

	/*
	 * Before a dot, we must be alphanumeric or dash. After the first dot,
	 * anything goes, so we can stop checking.
	 */
	for (; *name && *name != '.'; name++)
		if (*name != '-' && !isalnum(*name))
			return 0;
	return 1;
}

/* if new_name == NULL, the section is removed instead */
int git_config_rename_section_in_file(const char *config_filename,
				      const char *old_name, const char *new_name)
{
	int ret = 0, remove = 0;
	char *filename_buf = NULL;
	struct lock_file *lock;
	int out_fd;
	char buf[1024];
	FILE *config_file;
	struct stat st;

	if (new_name && !section_name_is_ok(new_name)) {
		ret = error("invalid section name: %s", new_name);
		goto out;
	}

	if (!config_filename)
		config_filename = filename_buf = git_pathdup("config");

	lock = xcalloc(1, sizeof(struct lock_file));
	out_fd = hold_lock_file_for_update(lock, config_filename, 0);
	if (out_fd < 0) {
		ret = error("could not lock config file %s", config_filename);
		goto out;
	}

	if (!(config_file = fopen(config_filename, "rb"))) {
		/* no config file means nothing to rename, no error */
		goto unlock_and_out;
	}

	fstat(fileno(config_file), &st);

	if (chmod(lock->filename.buf, st.st_mode & 07777) < 0) {
		ret = error("chmod on %s failed: %s",
				lock->filename.buf, strerror(errno));
		goto out;
	}

	while (fgets(buf, sizeof(buf), config_file)) {
		int i;
		int length;
		char *output = buf;
		for (i = 0; buf[i] && isspace(buf[i]); i++)
			; /* do nothing */
		if (buf[i] == '[') {
			/* it's a section */
			int offset = section_name_match(&buf[i], old_name);
			if (offset > 0) {
				ret++;
				if (new_name == NULL) {
					remove = 1;
					continue;
				}
				store.baselen = strlen(new_name);
				if (!store_write_section(out_fd, new_name)) {
					ret = write_error(lock->filename.buf);
					goto out;
				}
				/*
				 * We wrote out the new section, with
				 * a newline, now skip the old
				 * section's length
				 */
				output += offset + i;
				if (strlen(output) > 0) {
					/*
					 * More content means there's
					 * a declaration to put on the
					 * next line; indent with a
					 * tab
					 */
					output -= 1;
					output[0] = '\t';
				}
			}
			remove = 0;
		}
		if (remove)
			continue;
		length = strlen(output);
		if (write_in_full(out_fd, output, length) != length) {
			ret = write_error(lock->filename.buf);
			goto out;
		}
	}
	fclose(config_file);
unlock_and_out:
	if (commit_lock_file(lock) < 0)
		ret = error("could not commit config file %s", config_filename);
out:
	free(filename_buf);
	return ret;
}

int git_config_rename_section(const char *old_name, const char *new_name)
{
	return git_config_rename_section_in_file(NULL, old_name, new_name);
}

/*
 * Call this to report error for your variable that should not
 * get a boolean value (i.e. "[my] var" means "true").
 */
#undef config_error_nonbool
int config_error_nonbool(const char *var)
{
	return error("Missing value for '%s'", var);
}

int parse_config_key(const char *var,
		     const char *section,
		     const char **subsection, int *subsection_len,
		     const char **key)
{
	int section_len = strlen(section);
	const char *dot;

	/* Does it start with "section." ? */
	if (!starts_with(var, section) || var[section_len] != '.')
		return -1;

	/*
	 * Find the key; we don't know yet if we have a subsection, but we must
	 * parse backwards from the end, since the subsection may have dots in
	 * it, too.
	 */
	dot = strrchr(var, '.');
	*key = dot + 1;

	/* Did we have a subsection at all? */
	if (dot == var + section_len) {
		*subsection = NULL;
		*subsection_len = 0;
	}
	else {
		*subsection = var + section_len + 1;
		*subsection_len = dot - *subsection;
	}

	return 0;
}