commit: Show author if different from committer
[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
7d1864ce
JH
353 if (!strcmp(var, "core.bare")) {
354 is_bare_repository_cfg = git_config_bool(var, value);
355 return 0;
356 }
357
5f73076c
JH
358 if (!strcmp(var, "core.ignorestat")) {
359 assume_unchanged = git_config_bool(var, value);
360 return 0;
361 }
362
e388c738
JH
363 if (!strcmp(var, "core.prefersymlinkrefs")) {
364 prefer_symlink_refs = git_config_bool(var, value);
f8348be3
JS
365 return 0;
366 }
367
6de08ae6
SP
368 if (!strcmp(var, "core.logallrefupdates")) {
369 log_all_ref_updates = git_config_bool(var, value);
370 return 0;
371 }
372
2f8acdb3
JH
373 if (!strcmp(var, "core.warnambiguousrefs")) {
374 warn_ambiguous_refs = git_config_bool(var, value);
375 return 0;
376 }
377
960ccca6 378 if (!strcmp(var, "core.loosecompression")) {
12f6c308
JBH
379 int level = git_config_int(var, value);
380 if (level == -1)
381 level = Z_DEFAULT_COMPRESSION;
382 else if (level < 0 || level > Z_BEST_COMPRESSION)
383 die("bad zlib compression level %d", level);
384 zlib_compression_level = level;
960ccca6
DH
385 zlib_compression_seen = 1;
386 return 0;
387 }
388
389 if (!strcmp(var, "core.compression")) {
390 int level = git_config_int(var, value);
391 if (level == -1)
392 level = Z_DEFAULT_COMPRESSION;
393 else if (level < 0 || level > Z_BEST_COMPRESSION)
394 die("bad zlib compression level %d", level);
395 core_compression_level = level;
396 core_compression_seen = 1;
397 if (!zlib_compression_seen)
398 zlib_compression_level = level;
12f6c308
JBH
399 return 0;
400 }
401
60bb8b14 402 if (!strcmp(var, "core.packedgitwindowsize")) {
5faaf246 403 int pgsz_x2 = getpagesize() * 2;
60bb8b14 404 packed_git_window_size = git_config_int(var, value);
5faaf246
JH
405
406 /* This value must be multiple of (pagesize * 2) */
407 packed_git_window_size /= pgsz_x2;
408 if (packed_git_window_size < 1)
409 packed_git_window_size = 1;
410 packed_git_window_size *= pgsz_x2;
60bb8b14
SP
411 return 0;
412 }
413
77ccc5bb
SP
414 if (!strcmp(var, "core.packedgitlimit")) {
415 packed_git_limit = git_config_int(var, value);
416 return 0;
417 }
418
18bdec11
SP
419 if (!strcmp(var, "core.deltabasecachelimit")) {
420 delta_base_cache_limit = git_config_int(var, value);
421 return 0;
422 }
423
6c510bee 424 if (!strcmp(var, "core.autocrlf")) {
d7f46334
LT
425 if (value && !strcasecmp(value, "input")) {
426 auto_crlf = -1;
427 return 0;
428 }
6c510bee
LT
429 auto_crlf = git_config_bool(var, value);
430 return 0;
431 }
432
21e5ad50
SP
433 if (!strcmp(var, "core.safecrlf")) {
434 if (value && !strcasecmp(value, "warn")) {
435 safe_crlf = SAFE_CRLF_WARN;
436 return 0;
437 }
438 safe_crlf = git_config_bool(var, value);
439 return 0;
440 }
441
e1b10391 442 if (!strcmp(var, "user.name")) {
6c47d0e8
JH
443 if (!value)
444 return config_error_nonbool(var);
817151e6 445 strlcpy(git_default_name, value, sizeof(git_default_name));
e1b10391
LT
446 return 0;
447 }
448
449 if (!strcmp(var, "user.email")) {
6c47d0e8
JH
450 if (!value)
451 return config_error_nonbool(var);
817151e6 452 strlcpy(git_default_email, value, sizeof(git_default_email));
e1b10391
LT
453 return 0;
454 }
455
ea5105a5
CC
456 if (!strcmp(var, "i18n.commitencoding"))
457 return git_config_string(&git_commit_encoding, var, value);
d2c11a38 458
ea5105a5
CC
459 if (!strcmp(var, "i18n.logoutputencoding"))
460 return git_config_string(&git_log_output_encoding, var, value);
d2c11a38 461
a159ca0c 462 if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
aa086eb8
ML
463 pager_use_color = git_config_bool(var,value);
464 return 0;
465 }
466
872da32d
CC
467 if (!strcmp(var, "core.pager"))
468 return git_config_string(&pager_program, var, value);
54adf370 469
ee9601e6
CC
470 if (!strcmp(var, "core.editor"))
471 return git_config_string(&editor_program, var, value);
4d87b9c5 472
dfb068be
CC
473 if (!strcmp(var, "core.excludesfile"))
474 return git_config_string(&excludes_file, var, value);
039bc64e 475
a9cc857a 476 if (!strcmp(var, "core.whitespace")) {
6c47d0e8
JH
477 if (!value)
478 return config_error_nonbool(var);
cf1b7869 479 whitespace_rule_cfg = parse_whitespace_rule(value);
a9cc857a
JH
480 return 0;
481 }
9ed36cfa
JS
482 if (!strcmp(var, "branch.autosetupmerge")) {
483 if (value && !strcasecmp(value, "always")) {
484 git_branch_track = BRANCH_TRACK_ALWAYS;
485 return 0;
486 }
487 git_branch_track = git_config_bool(var, value);
488 return 0;
489 }
a9cc857a 490
1ab661dd 491 /* Add other config variables here and to Documentation/config.txt. */
17712991
LT
492 return 0;
493}
494
4f629539 495int git_config_from_file(config_fn_t fn, const char *filename)
17712991
LT
496{
497 int ret;
4f629539 498 FILE *f = fopen(filename, "r");
17712991
LT
499
500 ret = -1;
501 if (f) {
502 config_file = f;
4f629539 503 config_file_name = filename;
17712991 504 config_linenr = 1;
02e5ba4a 505 config_file_eof = 0;
17712991
LT
506 ret = git_parse_file(fn);
507 fclose(f);
4f629539 508 config_file_name = NULL;
17712991
LT
509 }
510 return ret;
511}
10bea152 512
506b17b1
JS
513const char *git_etc_gitconfig(void)
514{
7f0e39fa
JS
515 static const char *system_wide;
516 if (!system_wide) {
517 system_wide = ETC_GITCONFIG;
518 if (!is_absolute_path(system_wide)) {
519 /* interpret path relative to exec-dir */
ef5b9d6e
JS
520 struct strbuf d = STRBUF_INIT;
521 strbuf_addf(&d, "%s/%s", git_exec_path(), system_wide);
522 system_wide = strbuf_detach(&d, NULL);
7f0e39fa
JS
523 }
524 }
525 return system_wide;
506b17b1
JS
526}
527
ab88c363
JK
528int git_env_bool(const char *k, int def)
529{
530 const char *v = getenv(k);
531 return v ? git_config_bool(k, v) : def;
532}
533
534int git_config_system(void)
535{
536 return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
537}
538
539int git_config_global(void)
540{
541 return !git_env_bool("GIT_CONFIG_NOGLOBAL", 0);
542}
543
4f629539
JH
544int git_config(config_fn_t fn)
545{
5f1a63e0
JS
546 int ret = 0;
547 char *repo_config = NULL;
548 const char *home = NULL, *filename;
549
550 /* $GIT_CONFIG makes git read _only_ the given config file,
551 * $GIT_CONFIG_LOCAL will make it process it in addition to the
552 * global config file, the same way it would the per-repository
553 * config file otherwise. */
d4ebc36c 554 filename = getenv(CONFIG_ENVIRONMENT);
5f1a63e0 555 if (!filename) {
ab88c363 556 if (git_config_system() && !access(git_etc_gitconfig(), R_OK))
506b17b1 557 ret += git_config_from_file(fn, git_etc_gitconfig());
5f1a63e0 558 home = getenv("HOME");
d4ebc36c 559 filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
5f1a63e0 560 if (!filename)
9befac47 561 filename = repo_config = xstrdup(git_path("config"));
7f29f7a9 562 }
5f1a63e0 563
ab88c363 564 if (git_config_global() && home) {
9befac47 565 char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
e33d0611 566 if (!access(user_config, R_OK))
5f1a63e0
JS
567 ret = git_config_from_file(fn, user_config);
568 free(user_config);
569 }
570
571 ret += git_config_from_file(fn, filename);
4cac42b1 572 free(repo_config);
5f1a63e0 573 return ret;
4f629539
JH
574}
575
10bea152
JS
576/*
577 * Find all the stuff for git_config_set() below.
578 */
4ddba79d
JS
579
580#define MAX_MATCHES 512
581
10bea152
JS
582static struct {
583 int baselen;
584 char* key;
f98d863d 585 int do_not_match;
10bea152 586 regex_t* value_regex;
4ddba79d 587 int multi_replace;
dc49cd76 588 size_t offset[MAX_MATCHES];
10bea152
JS
589 enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
590 int seen;
591} store;
592
f98d863d
JS
593static int matches(const char* key, const char* value)
594{
595 return !strcmp(key, store.key) &&
596 (store.value_regex == NULL ||
597 (store.do_not_match ^
598 !regexec(store.value_regex, value, 0, NULL, 0)));
599}
600
10bea152
JS
601static int store_aux(const char* key, const char* value)
602{
ae9ee41d
JH
603 const char *ep;
604 size_t section_len;
605
10bea152
JS
606 switch (store.state) {
607 case KEY_SEEN:
f98d863d 608 if (matches(key, value)) {
4ddba79d 609 if (store.seen == 1 && store.multi_replace == 0) {
10bea152
JS
610 fprintf(stderr,
611 "Warning: %s has multiple values\n",
612 key);
4ddba79d
JS
613 } else if (store.seen >= MAX_MATCHES) {
614 fprintf(stderr, "Too many matches\n");
615 return 1;
10bea152 616 }
4ddba79d
JS
617
618 store.offset[store.seen] = ftell(config_file);
10bea152
JS
619 store.seen++;
620 }
621 break;
622 case SECTION_SEEN:
ae9ee41d
JH
623 /*
624 * What we are looking for is in store.key (both
625 * section and var), and its section part is baselen
626 * long. We found key (again, both section and var).
627 * We would want to know if this key is in the same
628 * section as what we are looking for. We already
629 * know we are in the same section as what should
630 * hold store.key.
631 */
632 ep = strrchr(key, '.');
633 section_len = ep - key;
634
635 if ((section_len != store.baselen) ||
636 memcmp(key, store.key, section_len+1)) {
10bea152
JS
637 store.state = SECTION_END_SEEN;
638 break;
ae9ee41d
JH
639 }
640
641 /*
642 * Do not increment matches: this is no match, but we
643 * just made sure we are in the desired section.
644 */
645 store.offset[store.seen] = ftell(config_file);
10bea152
JS
646 /* fallthru */
647 case SECTION_END_SEEN:
648 case START:
f98d863d 649 if (matches(key, value)) {
4ddba79d 650 store.offset[store.seen] = ftell(config_file);
10bea152
JS
651 store.state = KEY_SEEN;
652 store.seen++;
d14f7764
LT
653 } else {
654 if (strrchr(key, '.') - key == store.baselen &&
bdf0ef08 655 !strncmp(key, store.key, store.baselen)) {
93ddef3e 656 store.state = SECTION_SEEN;
bdf0ef08 657 store.offset[store.seen] = ftell(config_file);
d14f7764 658 }
bdf0ef08 659 }
10bea152
JS
660 }
661 return 0;
662}
663
b79d18c9 664static int write_error(void)
480c9e52
AW
665{
666 fprintf(stderr, "Failed to write new configuration file\n");
667
668 /* Same error code as "failed to rename". */
669 return 4;
670}
671
672static int store_write_section(int fd, const char* key)
10bea152 673{
cb891a59
KH
674 const char *dot;
675 int i, success;
676 struct strbuf sb;
d14f7764 677
cb891a59
KH
678 strbuf_init(&sb, 0);
679 dot = memchr(key, '.', store.baselen);
d14f7764 680 if (dot) {
cb891a59
KH
681 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
682 for (i = dot - key + 1; i < store.baselen; i++) {
683 if (key[i] == '"')
684 strbuf_addch(&sb, '\\');
685 strbuf_addch(&sb, key[i]);
d14f7764 686 }
cb891a59
KH
687 strbuf_addstr(&sb, "\"]\n");
688 } else {
689 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
d14f7764
LT
690 }
691
cb891a59
KH
692 success = write_in_full(fd, sb.buf, sb.len) == sb.len;
693 strbuf_release(&sb);
480c9e52 694
cb891a59 695 return success;
10bea152
JS
696}
697
480c9e52 698static int store_write_pair(int fd, const char* key, const char* value)
10bea152 699{
cb891a59
KH
700 int i, success;
701 int length = strlen(key + store.baselen + 1);
702 const char *quote = "";
703 struct strbuf sb;
cdd4fb15 704
6281f394
JM
705 /*
706 * Check to see if the value needs to be surrounded with a dq pair.
707 * Note that problematic characters are always backslash-quoted; this
708 * check is about not losing leading or trailing SP and strings that
709 * follow beginning-of-comment characters (i.e. ';' and '#') by the
710 * configuration parser.
711 */
cdd4fb15 712 if (value[0] == ' ')
cb891a59 713 quote = "\"";
cdd4fb15
BG
714 for (i = 0; value[i]; i++)
715 if (value[i] == ';' || value[i] == '#')
cb891a59
KH
716 quote = "\"";
717 if (i && value[i - 1] == ' ')
718 quote = "\"";
719
720 strbuf_init(&sb, 0);
721 strbuf_addf(&sb, "\t%.*s = %s",
722 length, key + store.baselen + 1, quote);
10bea152 723
10bea152
JS
724 for (i = 0; value[i]; i++)
725 switch (value[i]) {
480c9e52 726 case '\n':
cb891a59 727 strbuf_addstr(&sb, "\\n");
480c9e52
AW
728 break;
729 case '\t':
cb891a59 730 strbuf_addstr(&sb, "\\t");
480c9e52
AW
731 break;
732 case '"':
733 case '\\':
cb891a59 734 strbuf_addch(&sb, '\\');
480c9e52 735 default:
cb891a59 736 strbuf_addch(&sb, value[i]);
480c9e52
AW
737 break;
738 }
cb891a59
KH
739 strbuf_addf(&sb, "%s\n", quote);
740
741 success = write_in_full(fd, sb.buf, sb.len) == sb.len;
742 strbuf_release(&sb);
743
744 return success;
10bea152
JS
745}
746
dc49cd76
SP
747static ssize_t find_beginning_of_line(const char* contents, size_t size,
748 size_t offset_, int* found_bracket)
4ddba79d 749{
dc49cd76
SP
750 size_t equal_offset = size, bracket_offset = size;
751 ssize_t offset;
4ddba79d 752
7a31cc0f 753contline:
a6080a0a 754 for (offset = offset_-2; offset > 0
4ddba79d
JS
755 && contents[offset] != '\n'; offset--)
756 switch (contents[offset]) {
757 case '=': equal_offset = offset; break;
758 case ']': bracket_offset = offset; break;
759 }
7a31cc0f
FL
760 if (offset > 0 && contents[offset-1] == '\\') {
761 offset_ = offset;
762 goto contline;
763 }
4ddba79d
JS
764 if (bracket_offset < equal_offset) {
765 *found_bracket = 1;
766 offset = bracket_offset+1;
767 } else
768 offset++;
769
770 return offset;
771}
772
10bea152
JS
773int git_config_set(const char* key, const char* value)
774{
4ddba79d 775 return git_config_set_multivar(key, value, NULL, 0);
10bea152
JS
776}
777
778/*
779 * If value==NULL, unset in (remove from) config,
780 * if value_regex!=NULL, disregard key/value pairs where value does not match.
4ddba79d
JS
781 * if multi_replace==0, nothing, or only one matching key/value is replaced,
782 * else all matching key/values (regardless how many) are removed,
783 * before the new pair is written.
10bea152
JS
784 *
785 * Returns 0 on success.
786 *
787 * This function does this:
788 *
789 * - it locks the config file by creating ".git/config.lock"
790 *
791 * - it then parses the config using store_aux() as validator to find
792 * the position on the key/value pair to replace. If it is to be unset,
793 * it must be found exactly once.
794 *
795 * - the config file is mmap()ed and the part before the match (if any) is
796 * written to the lock file, then the changed part and the rest.
797 *
798 * - the config file is removed and the lock file rename()d to it.
799 *
800 */
801int git_config_set_multivar(const char* key, const char* value,
4ddba79d 802 const char* value_regex, int multi_replace)
10bea152 803{
d14f7764 804 int i, dot;
f8ba655e 805 int fd = -1, in_fd;
dafc88b1 806 int ret;
9c3796fc 807 char* config_filename;
6cbf973c 808 struct lock_file *lock = NULL;
b17e659d 809 const char* last_dot = strrchr(key, '.');
4ddba79d 810
d4ebc36c 811 config_filename = getenv(CONFIG_ENVIRONMENT);
9c3796fc 812 if (!config_filename) {
d4ebc36c 813 config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
9c3796fc
JS
814 if (!config_filename)
815 config_filename = git_path("config");
816 }
9befac47 817 config_filename = xstrdup(config_filename);
9c3796fc 818
10bea152
JS
819 /*
820 * Since "key" actually contains the section name and the real
821 * key name separated by a dot, we have to know where the dot is.
822 */
b17e659d 823
dafc88b1 824 if (last_dot == NULL) {
10bea152 825 fprintf(stderr, "key does not contain a section: %s\n", key);
dafc88b1
SH
826 ret = 2;
827 goto out_free;
10bea152 828 }
b17e659d
JS
829 store.baselen = last_dot - key;
830
831 store.multi_replace = multi_replace;
10bea152
JS
832
833 /*
834 * Validate the key and while at it, lower case it for matching.
835 */
2d7320d0 836 store.key = xmalloc(strlen(key) + 1);
d14f7764
LT
837 dot = 0;
838 for (i = 0; key[i]; i++) {
839 unsigned char c = key[i];
840 if (c == '.')
841 dot = 1;
842 /* Leave the extended basename untouched.. */
843 if (!dot || i > store.baselen) {
38c5afa8 844 if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
d14f7764
LT
845 fprintf(stderr, "invalid key: %s\n", key);
846 free(store.key);
847 ret = 1;
848 goto out_free;
849 }
850 c = tolower(c);
6f71686e
JS
851 } else if (c == '\n') {
852 fprintf(stderr, "invalid key (newline): %s\n", key);
853 free(store.key);
854 ret = 1;
855 goto out_free;
d14f7764
LT
856 }
857 store.key[i] = c;
858 }
3dd94e3b 859 store.key[i] = 0;
10bea152
JS
860
861 /*
6cbf973c 862 * The lock serves a purpose in addition to locking: the new
10bea152
JS
863 * contents of .git/config will be written into it.
864 */
6cbf973c
BS
865 lock = xcalloc(sizeof(struct lock_file), 1);
866 fd = hold_lock_file_for_update(lock, config_filename, 0);
867 if (fd < 0) {
10bea152
JS
868 fprintf(stderr, "could not lock config file\n");
869 free(store.key);
dafc88b1
SH
870 ret = -1;
871 goto out_free;
10bea152
JS
872 }
873
874 /*
875 * If .git/config does not exist yet, write a minimal version.
876 */
88fb958b
AR
877 in_fd = open(config_filename, O_RDONLY);
878 if ( in_fd < 0 ) {
10bea152
JS
879 free(store.key);
880
88fb958b
AR
881 if ( ENOENT != errno ) {
882 error("opening %s: %s", config_filename,
883 strerror(errno));
dafc88b1
SH
884 ret = 3; /* same as "invalid config file" */
885 goto out_free;
88fb958b 886 }
10bea152
JS
887 /* if nothing to unset, error out */
888 if (value == NULL) {
dafc88b1
SH
889 ret = 5;
890 goto out_free;
10bea152
JS
891 }
892
893 store.key = (char*)key;
480c9e52 894 if (!store_write_section(fd, key) ||
93c1e079
JH
895 !store_write_pair(fd, key, value))
896 goto write_err_out;
897 } else {
88fb958b 898 struct stat st;
10bea152 899 char* contents;
dc49cd76
SP
900 size_t contents_sz, copy_begin, copy_end;
901 int i, new_line = 0;
10bea152
JS
902
903 if (value_regex == NULL)
904 store.value_regex = NULL;
905 else {
f98d863d
JS
906 if (value_regex[0] == '!') {
907 store.do_not_match = 1;
908 value_regex++;
909 } else
910 store.do_not_match = 0;
911
2d7320d0 912 store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
10bea152
JS
913 if (regcomp(store.value_regex, value_regex,
914 REG_EXTENDED)) {
7246ed43 915 fprintf(stderr, "Invalid pattern: %s\n",
10bea152
JS
916 value_regex);
917 free(store.value_regex);
dafc88b1
SH
918 ret = 6;
919 goto out_free;
10bea152
JS
920 }
921 }
922
4ddba79d 923 store.offset[0] = 0;
10bea152
JS
924 store.state = START;
925 store.seen = 0;
926
927 /*
928 * After this, store.offset will contain the *end* offset
929 * of the last match, or remain at 0 if no match was found.
930 * As a side effect, we make sure to transform only a valid
931 * existing config file.
932 */
9c3796fc 933 if (git_config_from_file(store_aux, config_filename)) {
10bea152
JS
934 fprintf(stderr, "invalid config file\n");
935 free(store.key);
936 if (store.value_regex != NULL) {
937 regfree(store.value_regex);
938 free(store.value_regex);
939 }
dafc88b1
SH
940 ret = 3;
941 goto out_free;
10bea152
JS
942 }
943
944 free(store.key);
945 if (store.value_regex != NULL) {
946 regfree(store.value_regex);
947 free(store.value_regex);
948 }
949
4ddba79d
JS
950 /* if nothing to unset, or too many matches, error out */
951 if ((store.seen == 0 && value == NULL) ||
952 (store.seen > 1 && multi_replace == 0)) {
dafc88b1
SH
953 ret = 5;
954 goto out_free;
10bea152
JS
955 }
956
88fb958b 957 fstat(in_fd, &st);
dc49cd76
SP
958 contents_sz = xsize_t(st.st_size);
959 contents = xmmap(NULL, contents_sz, PROT_READ,
10bea152
JS
960 MAP_PRIVATE, in_fd, 0);
961 close(in_fd);
962
4ddba79d
JS
963 if (store.seen == 0)
964 store.seen = 1;
965
966 for (i = 0, copy_begin = 0; i < store.seen; i++) {
967 if (store.offset[i] == 0) {
dc49cd76 968 store.offset[i] = copy_end = contents_sz;
4ddba79d
JS
969 } else if (store.state != KEY_SEEN) {
970 copy_end = store.offset[i];
10bea152 971 } else
4ddba79d 972 copy_end = find_beginning_of_line(
dc49cd76 973 contents, contents_sz,
4ddba79d
JS
974 store.offset[i]-2, &new_line);
975
02e5ba4a
JK
976 if (copy_end > 0 && contents[copy_end-1] != '\n')
977 new_line = 1;
978
4ddba79d
JS
979 /* write the first part of the config */
980 if (copy_end > copy_begin) {
93c1e079
JH
981 if (write_in_full(fd, contents + copy_begin,
982 copy_end - copy_begin) <
983 copy_end - copy_begin)
984 goto write_err_out;
985 if (new_line &&
986 write_in_full(fd, "\n", 1) != 1)
987 goto write_err_out;
4ddba79d
JS
988 }
989 copy_begin = store.offset[i];
10bea152
JS
990 }
991
10bea152
JS
992 /* write the pair (value == NULL means unset) */
993 if (value != NULL) {
93c1e079
JH
994 if (store.state == START) {
995 if (!store_write_section(fd, key))
996 goto write_err_out;
480c9e52 997 }
93c1e079
JH
998 if (!store_write_pair(fd, key, value))
999 goto write_err_out;
10bea152
JS
1000 }
1001
1002 /* write the rest of the config */
dc49cd76 1003 if (copy_begin < contents_sz)
93c1e079 1004 if (write_in_full(fd, contents + copy_begin,
dc49cd76
SP
1005 contents_sz - copy_begin) <
1006 contents_sz - copy_begin)
93c1e079 1007 goto write_err_out;
10bea152 1008
dc49cd76 1009 munmap(contents, contents_sz);
10bea152
JS
1010 }
1011
4ed7cd3a 1012 if (commit_lock_file(lock) < 0) {
6cbf973c 1013 fprintf(stderr, "Cannot commit config file!\n");
dafc88b1
SH
1014 ret = 4;
1015 goto out_free;
10bea152
JS
1016 }
1017
6cbf973c
BS
1018 /*
1019 * lock is committed, so don't try to roll it back below.
1020 * NOTE: Since lockfile.c keeps a linked list of all created
1021 * lock_file structures, it isn't safe to free(lock). It's
1022 * better to just leave it hanging around.
1023 */
1024 lock = NULL;
dafc88b1
SH
1025 ret = 0;
1026
1027out_free:
6cbf973c
BS
1028 if (lock)
1029 rollback_lock_file(lock);
4cac42b1 1030 free(config_filename);
dafc88b1 1031 return ret;
93c1e079
JH
1032
1033write_err_out:
1034 ret = write_error();
1035 goto out_free;
1036
10bea152
JS
1037}
1038
118f8b24
PB
1039static int section_name_match (const char *buf, const char *name)
1040{
1041 int i = 0, j = 0, dot = 0;
1042 for (; buf[i] && buf[i] != ']'; i++) {
1043 if (!dot && isspace(buf[i])) {
1044 dot = 1;
1045 if (name[j++] != '.')
1046 break;
1047 for (i++; isspace(buf[i]); i++)
1048 ; /* do nothing */
1049 if (buf[i] != '"')
1050 break;
1051 continue;
1052 }
1053 if (buf[i] == '\\' && dot)
1054 i++;
1055 else if (buf[i] == '"' && dot) {
1056 for (i++; isspace(buf[i]); i++)
1057 ; /* do_nothing */
1058 break;
1059 }
1060 if (buf[i] != name[j++])
1061 break;
1062 }
1063 return (buf[i] == ']' && name[j] == 0);
1064}
1065
1066/* if new_name == NULL, the section is removed instead */
0667fcfb
JS
1067int git_config_rename_section(const char *old_name, const char *new_name)
1068{
118f8b24 1069 int ret = 0, remove = 0;
fc1905bb 1070 char *config_filename;
0667fcfb
JS
1071 struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1072 int out_fd;
1073 char buf[1024];
1074
d4ebc36c 1075 config_filename = getenv(CONFIG_ENVIRONMENT);
0667fcfb 1076 if (!config_filename) {
d4ebc36c 1077 config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
0667fcfb
JS
1078 if (!config_filename)
1079 config_filename = git_path("config");
1080 }
1081 config_filename = xstrdup(config_filename);
1082 out_fd = hold_lock_file_for_update(lock, config_filename, 0);
fc1905bb
JH
1083 if (out_fd < 0) {
1084 ret = error("Could not lock config file!");
1085 goto out;
1086 }
0667fcfb 1087
fc1905bb 1088 if (!(config_file = fopen(config_filename, "rb"))) {
01ebb9dc
GB
1089 /* no config file means nothing to rename, no error */
1090 goto unlock_and_out;
fc1905bb 1091 }
0667fcfb
JS
1092
1093 while (fgets(buf, sizeof(buf), config_file)) {
1094 int i;
480c9e52 1095 int length;
0667fcfb
JS
1096 for (i = 0; buf[i] && isspace(buf[i]); i++)
1097 ; /* do nothing */
1098 if (buf[i] == '[') {
1099 /* it's a section */
118f8b24
PB
1100 if (section_name_match (&buf[i+1], old_name)) {
1101 ret++;
1102 if (new_name == NULL) {
1103 remove = 1;
0667fcfb
JS
1104 continue;
1105 }
0667fcfb 1106 store.baselen = strlen(new_name);
480c9e52
AW
1107 if (!store_write_section(out_fd, new_name)) {
1108 ret = write_error();
1109 goto out;
1110 }
0667fcfb
JS
1111 continue;
1112 }
118f8b24 1113 remove = 0;
0667fcfb 1114 }
118f8b24
PB
1115 if (remove)
1116 continue;
480c9e52
AW
1117 length = strlen(buf);
1118 if (write_in_full(out_fd, buf, length) != length) {
1119 ret = write_error();
1120 goto out;
1121 }
0667fcfb 1122 }
fc1905bb 1123 fclose(config_file);
01ebb9dc 1124 unlock_and_out:
4ed7cd3a 1125 if (commit_lock_file(lock) < 0)
480c9e52 1126 ret = error("Cannot commit config file!");
fc1905bb
JH
1127 out:
1128 free(config_filename);
0667fcfb
JS
1129 return ret;
1130}
40ea4ed9
JH
1131
1132/*
1133 * Call this to report error for your variable that should not
1134 * get a boolean value (i.e. "[my] var" means "true").
1135 */
1136int config_error_nonbool(const char *var)
1137{
1138 return error("Missing value for '%s'", var);
1139}