filter-branch: fix variable export logic
[git/git.git] / config.c
CommitLineData
10bea152
JS
1/*
2 * GIT - The information manager from hell
3 *
4 * Copyright (C) Linus Torvalds, 2005
5 * Copyright (C) Johannes Schindelin, 2005
6 *
7 */
17712991 8#include "cache.h"
7f0e39fa 9#include "exec_cmd.h"
17712991
LT
10
11#define MAXNAME (256)
12
13static FILE *config_file;
0dccc7dc 14static const char *config_file_name;
17712991 15static int config_linenr;
02e5ba4a 16static int config_file_eof;
960ccca6
DH
17static int zlib_compression_seen;
18
17712991
LT
19static int get_next_char(void)
20{
21 int c;
22 FILE *f;
23
24 c = '\n';
25 if ((f = config_file) != NULL) {
26 c = fgetc(f);
db2c075d
JH
27 if (c == '\r') {
28 /* DOS like systems */
29 c = fgetc(f);
30 if (c != '\n') {
31 ungetc(c, f);
32 c = '\r';
33 }
34 }
17712991
LT
35 if (c == '\n')
36 config_linenr++;
37 if (c == EOF) {
02e5ba4a 38 config_file_eof = 1;
17712991
LT
39 c = '\n';
40 }
41 }
42 return c;
43}
44
45static char *parse_value(void)
46{
47 static char value[1024];
48 int quote = 0, comment = 0, len = 0, space = 0;
49
50 for (;;) {
51 int c = get_next_char();
52 if (len >= sizeof(value))
53 return NULL;
54 if (c == '\n') {
55 if (quote)
56 return NULL;
57 value[len] = 0;
58 return value;
59 }
60 if (comment)
61 continue;
62 if (isspace(c) && !quote) {
63 space = 1;
64 continue;
65 }
7ebdba61
JS
66 if (!quote) {
67 if (c == ';' || c == '#') {
68 comment = 1;
69 continue;
70 }
71 }
17712991
LT
72 if (space) {
73 if (len)
74 value[len++] = ' ';
75 space = 0;
76 }
77 if (c == '\\') {
78 c = get_next_char();
79 switch (c) {
80 case '\n':
81 continue;
82 case 't':
83 c = '\t';
84 break;
85 case 'b':
86 c = '\b';
87 break;
88 case 'n':
89 c = '\n';
90 break;
5cbb401d
LT
91 /* Some characters escape as themselves */
92 case '\\': case '"':
93 break;
94 /* Reject unknown escape sequences */
95 default:
96 return NULL;
17712991
LT
97 }
98 value[len++] = c;
99 continue;
100 }
101 if (c == '"') {
102 quote = 1-quote;
103 continue;
104 }
17712991
LT
105 value[len++] = c;
106 }
107}
108
38c5afa8
LT
109static inline int iskeychar(int c)
110{
111 return isalnum(c) || c == '-';
112}
113
17712991
LT
114static int get_value(config_fn_t fn, char *name, unsigned int len)
115{
116 int c;
117 char *value;
118
119 /* Get the full name */
120 for (;;) {
121 c = get_next_char();
02e5ba4a 122 if (config_file_eof)
17712991 123 break;
38c5afa8 124 if (!iskeychar(c))
17712991
LT
125 break;
126 name[len++] = tolower(c);
127 if (len >= MAXNAME)
128 return -1;
129 }
130 name[len] = 0;
131 while (c == ' ' || c == '\t')
132 c = get_next_char();
133
134 value = NULL;
135 if (c != '\n') {
136 if (c != '=')
137 return -1;
138 value = parse_value();
139 if (!value)
140 return -1;
141 }
142 return fn(name, value);
143}
144
d14f7764
LT
145static int get_extended_base_var(char *name, int baselen, int c)
146{
147 do {
148 if (c == '\n')
149 return -1;
150 c = get_next_char();
151 } while (isspace(c));
152
153 /* We require the format to be '[base "extension"]' */
154 if (c != '"')
155 return -1;
156 name[baselen++] = '.';
157
158 for (;;) {
159 int c = get_next_char();
160 if (c == '\n')
161 return -1;
162 if (c == '"')
163 break;
164 if (c == '\\') {
165 c = get_next_char();
166 if (c == '\n')
167 return -1;
168 }
169 name[baselen++] = c;
170 if (baselen > MAXNAME / 2)
171 return -1;
172 }
173
174 /* Final ']' */
175 if (get_next_char() != ']')
176 return -1;
177 return baselen;
178}
179
17712991
LT
180static int get_base_var(char *name)
181{
182 int baselen = 0;
183
184 for (;;) {
185 int c = get_next_char();
02e5ba4a 186 if (config_file_eof)
17712991
LT
187 return -1;
188 if (c == ']')
189 return baselen;
d14f7764
LT
190 if (isspace(c))
191 return get_extended_base_var(name, baselen, c);
38c5afa8 192 if (!iskeychar(c) && c != '.')
17712991
LT
193 return -1;
194 if (baselen > MAXNAME / 2)
195 return -1;
196 name[baselen++] = tolower(c);
197 }
198}
199
200static int git_parse_file(config_fn_t fn)
201{
202 int comment = 0;
203 int baselen = 0;
204 static char var[MAXNAME];
205
206 for (;;) {
207 int c = get_next_char();
208 if (c == '\n') {
02e5ba4a 209 if (config_file_eof)
17712991
LT
210 return 0;
211 comment = 0;
212 continue;
213 }
214 if (comment || isspace(c))
215 continue;
216 if (c == '#' || c == ';') {
217 comment = 1;
218 continue;
219 }
220 if (c == '[') {
221 baselen = get_base_var(var);
222 if (baselen <= 0)
223 break;
224 var[baselen++] = '.';
225 var[baselen] = 0;
226 continue;
227 }
228 if (!isalpha(c))
229 break;
128af9d1 230 var[baselen] = tolower(c);
17712991
LT
231 if (get_value(fn, var, baselen+1) < 0)
232 break;
233 }
4f629539 234 die("bad config file line %d in %s", config_linenr, config_file_name);
17712991
LT
235}
236
c8deb5a1 237static int parse_unit_factor(const char *end, unsigned long *val)
0b87b6e0
BD
238{
239 if (!*end)
240 return 1;
c8deb5a1
SP
241 else if (!strcasecmp(end, "k")) {
242 *val *= 1024;
243 return 1;
244 }
245 else if (!strcasecmp(end, "m")) {
246 *val *= 1024 * 1024;
247 return 1;
248 }
249 else if (!strcasecmp(end, "g")) {
250 *val *= 1024 * 1024 * 1024;
251 return 1;
252 }
253 return 0;
0b87b6e0
BD
254}
255
256int git_parse_long(const char *value, long *ret)
257{
258 if (value && *value) {
259 char *end;
260 long val = strtol(value, &end, 0);
c8deb5a1
SP
261 unsigned long factor = 1;
262 if (!parse_unit_factor(end, &factor))
263 return 0;
264 *ret = val * factor;
0b87b6e0
BD
265 return 1;
266 }
267 return 0;
268}
269
270int git_parse_ulong(const char *value, unsigned long *ret)
17712991
LT
271{
272 if (value && *value) {
273 char *end;
0b87b6e0 274 unsigned long val = strtoul(value, &end, 0);
c8deb5a1
SP
275 if (!parse_unit_factor(end, &val))
276 return 0;
277 *ret = val;
0b87b6e0 278 return 1;
17712991 279 }
0b87b6e0
BD
280 return 0;
281}
282
c1867cea
JK
283static void die_bad_config(const char *name)
284{
285 if (config_file_name)
286 die("bad config value for '%s' in %s", name, config_file_name);
287 die("bad config value for '%s'", name);
288}
289
0b87b6e0
BD
290int git_config_int(const char *name, const char *value)
291{
292 long ret;
293 if (!git_parse_long(value, &ret))
c1867cea 294 die_bad_config(name);
0b87b6e0
BD
295 return ret;
296}
297
298unsigned long git_config_ulong(const char *name, const char *value)
299{
300 unsigned long ret;
301 if (!git_parse_ulong(value, &ret))
c1867cea 302 die_bad_config(name);
0b87b6e0 303 return ret;
17712991
LT
304}
305
a53f2ec6 306int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
17712991 307{
a53f2ec6 308 *is_bool = 1;
17712991
LT
309 if (!value)
310 return 1;
311 if (!*value)
312 return 0;
624314fd 313 if (!strcasecmp(value, "true") || !strcasecmp(value, "yes"))
17712991 314 return 1;
624314fd 315 if (!strcasecmp(value, "false") || !strcasecmp(value, "no"))
17712991 316 return 0;
a53f2ec6 317 *is_bool = 0;
c35b0b58 318 return git_config_int(name, value);
17712991
LT
319}
320
a53f2ec6
JH
321int git_config_bool(const char *name, const char *value)
322{
323 int discard;
c35b0b58 324 return !!git_config_bool_or_int(name, value, &discard);
a53f2ec6
JH
325}
326
ea5105a5
CC
327int git_config_string(const char **dest, const char *var, const char *value)
328{
329 if (!value)
330 return config_error_nonbool(var);
331 *dest = xstrdup(value);
332 return 0;
333}
334
17712991
LT
335int git_default_config(const char *var, const char *value)
336{
337 /* This needs a better name */
338 if (!strcmp(var, "core.filemode")) {
339 trust_executable_bit = git_config_bool(var, value);
340 return 0;
341 }
342
9378c161
JH
343 if (!strcmp(var, "core.quotepath")) {
344 quote_path_fully = git_config_bool(var, value);
345 return 0;
346 }
347
78a8d641
JS
348 if (!strcmp(var, "core.symlinks")) {
349 has_symlinks = git_config_bool(var, value);
350 return 0;
351 }
352
0a9b88b7
LT
353 if (!strcmp(var, "core.ignorecase")) {
354 ignore_case = git_config_bool(var, value);
355 return 0;
356 }
357
7d1864ce
JH
358 if (!strcmp(var, "core.bare")) {
359 is_bare_repository_cfg = git_config_bool(var, value);
360 return 0;
361 }
362
5f73076c
JH
363 if (!strcmp(var, "core.ignorestat")) {
364 assume_unchanged = git_config_bool(var, value);
365 return 0;
366 }
367
e388c738
JH
368 if (!strcmp(var, "core.prefersymlinkrefs")) {
369 prefer_symlink_refs = git_config_bool(var, value);
f8348be3
JS
370 return 0;
371 }
372
6de08ae6
SP
373 if (!strcmp(var, "core.logallrefupdates")) {
374 log_all_ref_updates = git_config_bool(var, value);
375 return 0;
376 }
377
2f8acdb3
JH
378 if (!strcmp(var, "core.warnambiguousrefs")) {
379 warn_ambiguous_refs = git_config_bool(var, value);
380 return 0;
381 }
382
960ccca6 383 if (!strcmp(var, "core.loosecompression")) {
12f6c308
JBH
384 int level = git_config_int(var, value);
385 if (level == -1)
386 level = Z_DEFAULT_COMPRESSION;
387 else if (level < 0 || level > Z_BEST_COMPRESSION)
388 die("bad zlib compression level %d", level);
389 zlib_compression_level = level;
960ccca6
DH
390 zlib_compression_seen = 1;
391 return 0;
392 }
393
394 if (!strcmp(var, "core.compression")) {
395 int level = git_config_int(var, value);
396 if (level == -1)
397 level = Z_DEFAULT_COMPRESSION;
398 else if (level < 0 || level > Z_BEST_COMPRESSION)
399 die("bad zlib compression level %d", level);
400 core_compression_level = level;
401 core_compression_seen = 1;
402 if (!zlib_compression_seen)
403 zlib_compression_level = level;
12f6c308
JBH
404 return 0;
405 }
406
60bb8b14 407 if (!strcmp(var, "core.packedgitwindowsize")) {
5faaf246 408 int pgsz_x2 = getpagesize() * 2;
60bb8b14 409 packed_git_window_size = git_config_int(var, value);
5faaf246
JH
410
411 /* This value must be multiple of (pagesize * 2) */
412 packed_git_window_size /= pgsz_x2;
413 if (packed_git_window_size < 1)
414 packed_git_window_size = 1;
415 packed_git_window_size *= pgsz_x2;
60bb8b14
SP
416 return 0;
417 }
418
77ccc5bb
SP
419 if (!strcmp(var, "core.packedgitlimit")) {
420 packed_git_limit = git_config_int(var, value);
421 return 0;
422 }
423
18bdec11
SP
424 if (!strcmp(var, "core.deltabasecachelimit")) {
425 delta_base_cache_limit = git_config_int(var, value);
426 return 0;
427 }
428
6c510bee 429 if (!strcmp(var, "core.autocrlf")) {
d7f46334
LT
430 if (value && !strcasecmp(value, "input")) {
431 auto_crlf = -1;
432 return 0;
433 }
6c510bee
LT
434 auto_crlf = git_config_bool(var, value);
435 return 0;
436 }
437
21e5ad50
SP
438 if (!strcmp(var, "core.safecrlf")) {
439 if (value && !strcasecmp(value, "warn")) {
440 safe_crlf = SAFE_CRLF_WARN;
441 return 0;
442 }
443 safe_crlf = git_config_bool(var, value);
444 return 0;
445 }
446
e1b10391 447 if (!strcmp(var, "user.name")) {
6c47d0e8
JH
448 if (!value)
449 return config_error_nonbool(var);
817151e6 450 strlcpy(git_default_name, value, sizeof(git_default_name));
e1b10391
LT
451 return 0;
452 }
453
454 if (!strcmp(var, "user.email")) {
6c47d0e8
JH
455 if (!value)
456 return config_error_nonbool(var);
817151e6 457 strlcpy(git_default_email, value, sizeof(git_default_email));
e1b10391
LT
458 return 0;
459 }
460
ea5105a5
CC
461 if (!strcmp(var, "i18n.commitencoding"))
462 return git_config_string(&git_commit_encoding, var, value);
d2c11a38 463
ea5105a5
CC
464 if (!strcmp(var, "i18n.logoutputencoding"))
465 return git_config_string(&git_log_output_encoding, var, value);
d2c11a38 466
a159ca0c 467 if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
aa086eb8
ML
468 pager_use_color = git_config_bool(var,value);
469 return 0;
470 }
471
872da32d
CC
472 if (!strcmp(var, "core.pager"))
473 return git_config_string(&pager_program, var, value);
54adf370 474
ee9601e6
CC
475 if (!strcmp(var, "core.editor"))
476 return git_config_string(&editor_program, var, value);
4d87b9c5 477
dfb068be
CC
478 if (!strcmp(var, "core.excludesfile"))
479 return git_config_string(&excludes_file, var, value);
039bc64e 480
a9cc857a 481 if (!strcmp(var, "core.whitespace")) {
6c47d0e8
JH
482 if (!value)
483 return config_error_nonbool(var);
cf1b7869 484 whitespace_rule_cfg = parse_whitespace_rule(value);
a9cc857a
JH
485 return 0;
486 }
9ed36cfa
JS
487 if (!strcmp(var, "branch.autosetupmerge")) {
488 if (value && !strcasecmp(value, "always")) {
489 git_branch_track = BRANCH_TRACK_ALWAYS;
490 return 0;
491 }
492 git_branch_track = git_config_bool(var, value);
493 return 0;
494 }
c998ae9b
DS
495 if (!strcmp(var, "branch.autosetuprebase")) {
496 if (!value)
497 return config_error_nonbool(var);
498 else if (!strcmp(value, "never"))
499 autorebase = AUTOREBASE_NEVER;
500 else if (!strcmp(value, "local"))
501 autorebase = AUTOREBASE_LOCAL;
502 else if (!strcmp(value, "remote"))
503 autorebase = AUTOREBASE_REMOTE;
504 else if (!strcmp(value, "always"))
505 autorebase = AUTOREBASE_ALWAYS;
506 else
507 return error("Malformed value for %s", var);
508 return 0;
509 }
a9cc857a 510
1ab661dd 511 /* Add other config variables here and to Documentation/config.txt. */
17712991
LT
512 return 0;
513}
514
4f629539 515int git_config_from_file(config_fn_t fn, const char *filename)
17712991
LT
516{
517 int ret;
4f629539 518 FILE *f = fopen(filename, "r");
17712991
LT
519
520 ret = -1;
521 if (f) {
522 config_file = f;
4f629539 523 config_file_name = filename;
17712991 524 config_linenr = 1;
02e5ba4a 525 config_file_eof = 0;
17712991
LT
526 ret = git_parse_file(fn);
527 fclose(f);
4f629539 528 config_file_name = NULL;
17712991
LT
529 }
530 return ret;
531}
10bea152 532
506b17b1
JS
533const char *git_etc_gitconfig(void)
534{
7f0e39fa
JS
535 static const char *system_wide;
536 if (!system_wide) {
537 system_wide = ETC_GITCONFIG;
538 if (!is_absolute_path(system_wide)) {
539 /* interpret path relative to exec-dir */
ef5b9d6e
JS
540 struct strbuf d = STRBUF_INIT;
541 strbuf_addf(&d, "%s/%s", git_exec_path(), system_wide);
542 system_wide = strbuf_detach(&d, NULL);
7f0e39fa
JS
543 }
544 }
545 return system_wide;
506b17b1
JS
546}
547
ab88c363
JK
548int git_env_bool(const char *k, int def)
549{
550 const char *v = getenv(k);
551 return v ? git_config_bool(k, v) : def;
552}
553
554int git_config_system(void)
555{
556 return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
557}
558
559int git_config_global(void)
560{
561 return !git_env_bool("GIT_CONFIG_NOGLOBAL", 0);
562}
563
4f629539
JH
564int git_config(config_fn_t fn)
565{
5f1a63e0
JS
566 int ret = 0;
567 char *repo_config = NULL;
568 const char *home = NULL, *filename;
569
570 /* $GIT_CONFIG makes git read _only_ the given config file,
571 * $GIT_CONFIG_LOCAL will make it process it in addition to the
572 * global config file, the same way it would the per-repository
573 * config file otherwise. */
d4ebc36c 574 filename = getenv(CONFIG_ENVIRONMENT);
5f1a63e0 575 if (!filename) {
ab88c363 576 if (git_config_system() && !access(git_etc_gitconfig(), R_OK))
506b17b1 577 ret += git_config_from_file(fn, git_etc_gitconfig());
5f1a63e0 578 home = getenv("HOME");
d4ebc36c 579 filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
5f1a63e0 580 if (!filename)
9befac47 581 filename = repo_config = xstrdup(git_path("config"));
7f29f7a9 582 }
5f1a63e0 583
ab88c363 584 if (git_config_global() && home) {
9befac47 585 char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
e33d0611 586 if (!access(user_config, R_OK))
5f1a63e0
JS
587 ret = git_config_from_file(fn, user_config);
588 free(user_config);
589 }
590
591 ret += git_config_from_file(fn, filename);
4cac42b1 592 free(repo_config);
5f1a63e0 593 return ret;
4f629539
JH
594}
595
10bea152
JS
596/*
597 * Find all the stuff for git_config_set() below.
598 */
4ddba79d
JS
599
600#define MAX_MATCHES 512
601
10bea152
JS
602static struct {
603 int baselen;
604 char* key;
f98d863d 605 int do_not_match;
10bea152 606 regex_t* value_regex;
4ddba79d 607 int multi_replace;
dc49cd76 608 size_t offset[MAX_MATCHES];
10bea152
JS
609 enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
610 int seen;
611} store;
612
f98d863d
JS
613static int matches(const char* key, const char* value)
614{
615 return !strcmp(key, store.key) &&
616 (store.value_regex == NULL ||
617 (store.do_not_match ^
618 !regexec(store.value_regex, value, 0, NULL, 0)));
619}
620
10bea152
JS
621static int store_aux(const char* key, const char* value)
622{
ae9ee41d
JH
623 const char *ep;
624 size_t section_len;
625
10bea152
JS
626 switch (store.state) {
627 case KEY_SEEN:
f98d863d 628 if (matches(key, value)) {
4ddba79d 629 if (store.seen == 1 && store.multi_replace == 0) {
64c0d71c 630 warning("%s has multiple values", key);
4ddba79d 631 } else if (store.seen >= MAX_MATCHES) {
64c0d71c 632 error("too many matches for %s", key);
4ddba79d 633 return 1;
10bea152 634 }
4ddba79d
JS
635
636 store.offset[store.seen] = ftell(config_file);
10bea152
JS
637 store.seen++;
638 }
639 break;
640 case SECTION_SEEN:
ae9ee41d
JH
641 /*
642 * What we are looking for is in store.key (both
643 * section and var), and its section part is baselen
644 * long. We found key (again, both section and var).
645 * We would want to know if this key is in the same
646 * section as what we are looking for. We already
647 * know we are in the same section as what should
648 * hold store.key.
649 */
650 ep = strrchr(key, '.');
651 section_len = ep - key;
652
653 if ((section_len != store.baselen) ||
654 memcmp(key, store.key, section_len+1)) {
10bea152
JS
655 store.state = SECTION_END_SEEN;
656 break;
ae9ee41d
JH
657 }
658
659 /*
660 * Do not increment matches: this is no match, but we
661 * just made sure we are in the desired section.
662 */
663 store.offset[store.seen] = ftell(config_file);
10bea152
JS
664 /* fallthru */
665 case SECTION_END_SEEN:
666 case START:
f98d863d 667 if (matches(key, value)) {
4ddba79d 668 store.offset[store.seen] = ftell(config_file);
10bea152
JS
669 store.state = KEY_SEEN;
670 store.seen++;
d14f7764
LT
671 } else {
672 if (strrchr(key, '.') - key == store.baselen &&
bdf0ef08 673 !strncmp(key, store.key, store.baselen)) {
93ddef3e 674 store.state = SECTION_SEEN;
bdf0ef08 675 store.offset[store.seen] = ftell(config_file);
d14f7764 676 }
bdf0ef08 677 }
10bea152
JS
678 }
679 return 0;
680}
681
64c0d71c 682static int write_error(const char *filename)
480c9e52 683{
64c0d71c 684 error("failed to write new configuration file %s", filename);
480c9e52
AW
685
686 /* Same error code as "failed to rename". */
687 return 4;
688}
689
690static int store_write_section(int fd, const char* key)
10bea152 691{
cb891a59
KH
692 const char *dot;
693 int i, success;
694 struct strbuf sb;
d14f7764 695
cb891a59
KH
696 strbuf_init(&sb, 0);
697 dot = memchr(key, '.', store.baselen);
d14f7764 698 if (dot) {
cb891a59
KH
699 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
700 for (i = dot - key + 1; i < store.baselen; i++) {
701 if (key[i] == '"')
702 strbuf_addch(&sb, '\\');
703 strbuf_addch(&sb, key[i]);
d14f7764 704 }
cb891a59
KH
705 strbuf_addstr(&sb, "\"]\n");
706 } else {
707 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
d14f7764
LT
708 }
709
cb891a59
KH
710 success = write_in_full(fd, sb.buf, sb.len) == sb.len;
711 strbuf_release(&sb);
480c9e52 712
cb891a59 713 return success;
10bea152
JS
714}
715
480c9e52 716static int store_write_pair(int fd, const char* key, const char* value)
10bea152 717{
cb891a59
KH
718 int i, success;
719 int length = strlen(key + store.baselen + 1);
720 const char *quote = "";
721 struct strbuf sb;
cdd4fb15 722
6281f394
JM
723 /*
724 * Check to see if the value needs to be surrounded with a dq pair.
725 * Note that problematic characters are always backslash-quoted; this
726 * check is about not losing leading or trailing SP and strings that
727 * follow beginning-of-comment characters (i.e. ';' and '#') by the
728 * configuration parser.
729 */
cdd4fb15 730 if (value[0] == ' ')
cb891a59 731 quote = "\"";
cdd4fb15
BG
732 for (i = 0; value[i]; i++)
733 if (value[i] == ';' || value[i] == '#')
cb891a59
KH
734 quote = "\"";
735 if (i && value[i - 1] == ' ')
736 quote = "\"";
737
738 strbuf_init(&sb, 0);
739 strbuf_addf(&sb, "\t%.*s = %s",
740 length, key + store.baselen + 1, quote);
10bea152 741
10bea152
JS
742 for (i = 0; value[i]; i++)
743 switch (value[i]) {
480c9e52 744 case '\n':
cb891a59 745 strbuf_addstr(&sb, "\\n");
480c9e52
AW
746 break;
747 case '\t':
cb891a59 748 strbuf_addstr(&sb, "\\t");
480c9e52
AW
749 break;
750 case '"':
751 case '\\':
cb891a59 752 strbuf_addch(&sb, '\\');
480c9e52 753 default:
cb891a59 754 strbuf_addch(&sb, value[i]);
480c9e52
AW
755 break;
756 }
cb891a59
KH
757 strbuf_addf(&sb, "%s\n", quote);
758
759 success = write_in_full(fd, sb.buf, sb.len) == sb.len;
760 strbuf_release(&sb);
761
762 return success;
10bea152
JS
763}
764
dc49cd76
SP
765static ssize_t find_beginning_of_line(const char* contents, size_t size,
766 size_t offset_, int* found_bracket)
4ddba79d 767{
dc49cd76
SP
768 size_t equal_offset = size, bracket_offset = size;
769 ssize_t offset;
4ddba79d 770
7a31cc0f 771contline:
a6080a0a 772 for (offset = offset_-2; offset > 0
4ddba79d
JS
773 && contents[offset] != '\n'; offset--)
774 switch (contents[offset]) {
775 case '=': equal_offset = offset; break;
776 case ']': bracket_offset = offset; break;
777 }
7a31cc0f
FL
778 if (offset > 0 && contents[offset-1] == '\\') {
779 offset_ = offset;
780 goto contline;
781 }
4ddba79d
JS
782 if (bracket_offset < equal_offset) {
783 *found_bracket = 1;
784 offset = bracket_offset+1;
785 } else
786 offset++;
787
788 return offset;
789}
790
10bea152
JS
791int git_config_set(const char* key, const char* value)
792{
4ddba79d 793 return git_config_set_multivar(key, value, NULL, 0);
10bea152
JS
794}
795
796/*
797 * If value==NULL, unset in (remove from) config,
798 * if value_regex!=NULL, disregard key/value pairs where value does not match.
4ddba79d
JS
799 * if multi_replace==0, nothing, or only one matching key/value is replaced,
800 * else all matching key/values (regardless how many) are removed,
801 * before the new pair is written.
10bea152
JS
802 *
803 * Returns 0 on success.
804 *
805 * This function does this:
806 *
807 * - it locks the config file by creating ".git/config.lock"
808 *
809 * - it then parses the config using store_aux() as validator to find
810 * the position on the key/value pair to replace. If it is to be unset,
811 * it must be found exactly once.
812 *
813 * - the config file is mmap()ed and the part before the match (if any) is
814 * written to the lock file, then the changed part and the rest.
815 *
816 * - the config file is removed and the lock file rename()d to it.
817 *
818 */
819int git_config_set_multivar(const char* key, const char* value,
4ddba79d 820 const char* value_regex, int multi_replace)
10bea152 821{
d14f7764 822 int i, dot;
f8ba655e 823 int fd = -1, in_fd;
dafc88b1 824 int ret;
9c3796fc 825 char* config_filename;
6cbf973c 826 struct lock_file *lock = NULL;
b17e659d 827 const char* last_dot = strrchr(key, '.');
4ddba79d 828
d4ebc36c 829 config_filename = getenv(CONFIG_ENVIRONMENT);
9c3796fc 830 if (!config_filename) {
d4ebc36c 831 config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
9c3796fc
JS
832 if (!config_filename)
833 config_filename = git_path("config");
834 }
9befac47 835 config_filename = xstrdup(config_filename);
9c3796fc 836
10bea152
JS
837 /*
838 * Since "key" actually contains the section name and the real
839 * key name separated by a dot, we have to know where the dot is.
840 */
b17e659d 841
dafc88b1 842 if (last_dot == NULL) {
64c0d71c 843 error("key does not contain a section: %s", key);
dafc88b1
SH
844 ret = 2;
845 goto out_free;
10bea152 846 }
b17e659d
JS
847 store.baselen = last_dot - key;
848
849 store.multi_replace = multi_replace;
10bea152
JS
850
851 /*
852 * Validate the key and while at it, lower case it for matching.
853 */
2d7320d0 854 store.key = xmalloc(strlen(key) + 1);
d14f7764
LT
855 dot = 0;
856 for (i = 0; key[i]; i++) {
857 unsigned char c = key[i];
858 if (c == '.')
859 dot = 1;
860 /* Leave the extended basename untouched.. */
861 if (!dot || i > store.baselen) {
38c5afa8 862 if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
64c0d71c 863 error("invalid key: %s", key);
d14f7764
LT
864 free(store.key);
865 ret = 1;
866 goto out_free;
867 }
868 c = tolower(c);
6f71686e 869 } else if (c == '\n') {
64c0d71c 870 error("invalid key (newline): %s", key);
6f71686e
JS
871 free(store.key);
872 ret = 1;
873 goto out_free;
d14f7764
LT
874 }
875 store.key[i] = c;
876 }
3dd94e3b 877 store.key[i] = 0;
10bea152
JS
878
879 /*
6cbf973c 880 * The lock serves a purpose in addition to locking: the new
10bea152
JS
881 * contents of .git/config will be written into it.
882 */
6cbf973c
BS
883 lock = xcalloc(sizeof(struct lock_file), 1);
884 fd = hold_lock_file_for_update(lock, config_filename, 0);
885 if (fd < 0) {
64c0d71c 886 error("could not lock config file %s", config_filename);
10bea152 887 free(store.key);
dafc88b1
SH
888 ret = -1;
889 goto out_free;
10bea152
JS
890 }
891
892 /*
893 * If .git/config does not exist yet, write a minimal version.
894 */
88fb958b
AR
895 in_fd = open(config_filename, O_RDONLY);
896 if ( in_fd < 0 ) {
10bea152
JS
897 free(store.key);
898
88fb958b
AR
899 if ( ENOENT != errno ) {
900 error("opening %s: %s", config_filename,
901 strerror(errno));
dafc88b1
SH
902 ret = 3; /* same as "invalid config file" */
903 goto out_free;
88fb958b 904 }
10bea152
JS
905 /* if nothing to unset, error out */
906 if (value == NULL) {
dafc88b1
SH
907 ret = 5;
908 goto out_free;
10bea152
JS
909 }
910
911 store.key = (char*)key;
480c9e52 912 if (!store_write_section(fd, key) ||
93c1e079
JH
913 !store_write_pair(fd, key, value))
914 goto write_err_out;
915 } else {
88fb958b 916 struct stat st;
10bea152 917 char* contents;
dc49cd76
SP
918 size_t contents_sz, copy_begin, copy_end;
919 int i, new_line = 0;
10bea152
JS
920
921 if (value_regex == NULL)
922 store.value_regex = NULL;
923 else {
f98d863d
JS
924 if (value_regex[0] == '!') {
925 store.do_not_match = 1;
926 value_regex++;
927 } else
928 store.do_not_match = 0;
929
2d7320d0 930 store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
10bea152
JS
931 if (regcomp(store.value_regex, value_regex,
932 REG_EXTENDED)) {
64c0d71c 933 error("invalid pattern: %s", value_regex);
10bea152 934 free(store.value_regex);
dafc88b1
SH
935 ret = 6;
936 goto out_free;
10bea152
JS
937 }
938 }
939
4ddba79d 940 store.offset[0] = 0;
10bea152
JS
941 store.state = START;
942 store.seen = 0;
943
944 /*
945 * After this, store.offset will contain the *end* offset
946 * of the last match, or remain at 0 if no match was found.
947 * As a side effect, we make sure to transform only a valid
948 * existing config file.
949 */
9c3796fc 950 if (git_config_from_file(store_aux, config_filename)) {
64c0d71c 951 error("invalid config file %s", config_filename);
10bea152
JS
952 free(store.key);
953 if (store.value_regex != NULL) {
954 regfree(store.value_regex);
955 free(store.value_regex);
956 }
dafc88b1
SH
957 ret = 3;
958 goto out_free;
10bea152
JS
959 }
960
961 free(store.key);
962 if (store.value_regex != NULL) {
963 regfree(store.value_regex);
964 free(store.value_regex);
965 }
966
4ddba79d
JS
967 /* if nothing to unset, or too many matches, error out */
968 if ((store.seen == 0 && value == NULL) ||
969 (store.seen > 1 && multi_replace == 0)) {
dafc88b1
SH
970 ret = 5;
971 goto out_free;
10bea152
JS
972 }
973
88fb958b 974 fstat(in_fd, &st);
dc49cd76
SP
975 contents_sz = xsize_t(st.st_size);
976 contents = xmmap(NULL, contents_sz, PROT_READ,
10bea152
JS
977 MAP_PRIVATE, in_fd, 0);
978 close(in_fd);
979
4ddba79d
JS
980 if (store.seen == 0)
981 store.seen = 1;
982
983 for (i = 0, copy_begin = 0; i < store.seen; i++) {
984 if (store.offset[i] == 0) {
dc49cd76 985 store.offset[i] = copy_end = contents_sz;
4ddba79d
JS
986 } else if (store.state != KEY_SEEN) {
987 copy_end = store.offset[i];
10bea152 988 } else
4ddba79d 989 copy_end = find_beginning_of_line(
dc49cd76 990 contents, contents_sz,
4ddba79d
JS
991 store.offset[i]-2, &new_line);
992
02e5ba4a
JK
993 if (copy_end > 0 && contents[copy_end-1] != '\n')
994 new_line = 1;
995
4ddba79d
JS
996 /* write the first part of the config */
997 if (copy_end > copy_begin) {
93c1e079
JH
998 if (write_in_full(fd, contents + copy_begin,
999 copy_end - copy_begin) <
1000 copy_end - copy_begin)
1001 goto write_err_out;
1002 if (new_line &&
1003 write_in_full(fd, "\n", 1) != 1)
1004 goto write_err_out;
4ddba79d
JS
1005 }
1006 copy_begin = store.offset[i];
10bea152
JS
1007 }
1008
10bea152
JS
1009 /* write the pair (value == NULL means unset) */
1010 if (value != NULL) {
93c1e079
JH
1011 if (store.state == START) {
1012 if (!store_write_section(fd, key))
1013 goto write_err_out;
480c9e52 1014 }
93c1e079
JH
1015 if (!store_write_pair(fd, key, value))
1016 goto write_err_out;
10bea152
JS
1017 }
1018
1019 /* write the rest of the config */
dc49cd76 1020 if (copy_begin < contents_sz)
93c1e079 1021 if (write_in_full(fd, contents + copy_begin,
dc49cd76
SP
1022 contents_sz - copy_begin) <
1023 contents_sz - copy_begin)
93c1e079 1024 goto write_err_out;
10bea152 1025
dc49cd76 1026 munmap(contents, contents_sz);
10bea152
JS
1027 }
1028
4ed7cd3a 1029 if (commit_lock_file(lock) < 0) {
64c0d71c 1030 error("could not commit config file %s", config_filename);
dafc88b1
SH
1031 ret = 4;
1032 goto out_free;
10bea152
JS
1033 }
1034
6cbf973c
BS
1035 /*
1036 * lock is committed, so don't try to roll it back below.
1037 * NOTE: Since lockfile.c keeps a linked list of all created
1038 * lock_file structures, it isn't safe to free(lock). It's
1039 * better to just leave it hanging around.
1040 */
1041 lock = NULL;
dafc88b1
SH
1042 ret = 0;
1043
1044out_free:
6cbf973c
BS
1045 if (lock)
1046 rollback_lock_file(lock);
4cac42b1 1047 free(config_filename);
dafc88b1 1048 return ret;
93c1e079
JH
1049
1050write_err_out:
64c0d71c 1051 ret = write_error(lock->filename);
93c1e079
JH
1052 goto out_free;
1053
10bea152
JS
1054}
1055
118f8b24
PB
1056static int section_name_match (const char *buf, const char *name)
1057{
1058 int i = 0, j = 0, dot = 0;
1059 for (; buf[i] && buf[i] != ']'; i++) {
1060 if (!dot && isspace(buf[i])) {
1061 dot = 1;
1062 if (name[j++] != '.')
1063 break;
1064 for (i++; isspace(buf[i]); i++)
1065 ; /* do nothing */
1066 if (buf[i] != '"')
1067 break;
1068 continue;
1069 }
1070 if (buf[i] == '\\' && dot)
1071 i++;
1072 else if (buf[i] == '"' && dot) {
1073 for (i++; isspace(buf[i]); i++)
1074 ; /* do_nothing */
1075 break;
1076 }
1077 if (buf[i] != name[j++])
1078 break;
1079 }
1080 return (buf[i] == ']' && name[j] == 0);
1081}
1082
1083/* if new_name == NULL, the section is removed instead */
0667fcfb
JS
1084int git_config_rename_section(const char *old_name, const char *new_name)
1085{
118f8b24 1086 int ret = 0, remove = 0;
fc1905bb 1087 char *config_filename;
0667fcfb
JS
1088 struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1089 int out_fd;
1090 char buf[1024];
1091
d4ebc36c 1092 config_filename = getenv(CONFIG_ENVIRONMENT);
0667fcfb 1093 if (!config_filename) {
d4ebc36c 1094 config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
0667fcfb
JS
1095 if (!config_filename)
1096 config_filename = git_path("config");
1097 }
1098 config_filename = xstrdup(config_filename);
1099 out_fd = hold_lock_file_for_update(lock, config_filename, 0);
fc1905bb 1100 if (out_fd < 0) {
64c0d71c 1101 ret = error("could not lock config file %s", config_filename);
fc1905bb
JH
1102 goto out;
1103 }
0667fcfb 1104
fc1905bb 1105 if (!(config_file = fopen(config_filename, "rb"))) {
01ebb9dc
GB
1106 /* no config file means nothing to rename, no error */
1107 goto unlock_and_out;
fc1905bb 1108 }
0667fcfb
JS
1109
1110 while (fgets(buf, sizeof(buf), config_file)) {
1111 int i;
480c9e52 1112 int length;
0667fcfb
JS
1113 for (i = 0; buf[i] && isspace(buf[i]); i++)
1114 ; /* do nothing */
1115 if (buf[i] == '[') {
1116 /* it's a section */
118f8b24
PB
1117 if (section_name_match (&buf[i+1], old_name)) {
1118 ret++;
1119 if (new_name == NULL) {
1120 remove = 1;
0667fcfb
JS
1121 continue;
1122 }
0667fcfb 1123 store.baselen = strlen(new_name);
480c9e52 1124 if (!store_write_section(out_fd, new_name)) {
64c0d71c 1125 ret = write_error(lock->filename);
480c9e52
AW
1126 goto out;
1127 }
0667fcfb
JS
1128 continue;
1129 }
118f8b24 1130 remove = 0;
0667fcfb 1131 }
118f8b24
PB
1132 if (remove)
1133 continue;
480c9e52
AW
1134 length = strlen(buf);
1135 if (write_in_full(out_fd, buf, length) != length) {
64c0d71c 1136 ret = write_error(lock->filename);
480c9e52
AW
1137 goto out;
1138 }
0667fcfb 1139 }
fc1905bb 1140 fclose(config_file);
01ebb9dc 1141 unlock_and_out:
4ed7cd3a 1142 if (commit_lock_file(lock) < 0)
64c0d71c 1143 ret = error("could not commit config file %s", config_filename);
fc1905bb
JH
1144 out:
1145 free(config_filename);
0667fcfb
JS
1146 return ret;
1147}
40ea4ed9
JH
1148
1149/*
1150 * Call this to report error for your variable that should not
1151 * get a boolean value (i.e. "[my] var" means "true").
1152 */
1153int config_error_nonbool(const char *var)
1154{
1155 return error("Missing value for '%s'", var);
1156}