git-send-email: Do not make @-less message ID
[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
LT
8#include "cache.h"
9
10#define MAXNAME (256)
11
12static FILE *config_file;
0dccc7dc 13static const char *config_file_name;
17712991 14static int config_linenr;
960ccca6
DH
15static int zlib_compression_seen;
16
17712991
LT
17static int get_next_char(void)
18{
19 int c;
20 FILE *f;
21
22 c = '\n';
23 if ((f = config_file) != NULL) {
24 c = fgetc(f);
db2c075d
JH
25 if (c == '\r') {
26 /* DOS like systems */
27 c = fgetc(f);
28 if (c != '\n') {
29 ungetc(c, f);
30 c = '\r';
31 }
32 }
17712991
LT
33 if (c == '\n')
34 config_linenr++;
35 if (c == EOF) {
36 config_file = NULL;
37 c = '\n';
38 }
39 }
40 return c;
41}
42
43static char *parse_value(void)
44{
45 static char value[1024];
46 int quote = 0, comment = 0, len = 0, space = 0;
47
48 for (;;) {
49 int c = get_next_char();
50 if (len >= sizeof(value))
51 return NULL;
52 if (c == '\n') {
53 if (quote)
54 return NULL;
55 value[len] = 0;
56 return value;
57 }
58 if (comment)
59 continue;
60 if (isspace(c) && !quote) {
61 space = 1;
62 continue;
63 }
7ebdba61
JS
64 if (!quote) {
65 if (c == ';' || c == '#') {
66 comment = 1;
67 continue;
68 }
69 }
17712991
LT
70 if (space) {
71 if (len)
72 value[len++] = ' ';
73 space = 0;
74 }
75 if (c == '\\') {
76 c = get_next_char();
77 switch (c) {
78 case '\n':
79 continue;
80 case 't':
81 c = '\t';
82 break;
83 case 'b':
84 c = '\b';
85 break;
86 case 'n':
87 c = '\n';
88 break;
5cbb401d
LT
89 /* Some characters escape as themselves */
90 case '\\': case '"':
91 break;
92 /* Reject unknown escape sequences */
93 default:
94 return NULL;
17712991
LT
95 }
96 value[len++] = c;
97 continue;
98 }
99 if (c == '"') {
100 quote = 1-quote;
101 continue;
102 }
17712991
LT
103 value[len++] = c;
104 }
105}
106
38c5afa8
LT
107static inline int iskeychar(int c)
108{
109 return isalnum(c) || c == '-';
110}
111
17712991
LT
112static int get_value(config_fn_t fn, char *name, unsigned int len)
113{
114 int c;
115 char *value;
116
117 /* Get the full name */
118 for (;;) {
119 c = get_next_char();
120 if (c == EOF)
121 break;
38c5afa8 122 if (!iskeychar(c))
17712991
LT
123 break;
124 name[len++] = tolower(c);
125 if (len >= MAXNAME)
126 return -1;
127 }
128 name[len] = 0;
129 while (c == ' ' || c == '\t')
130 c = get_next_char();
131
132 value = NULL;
133 if (c != '\n') {
134 if (c != '=')
135 return -1;
136 value = parse_value();
137 if (!value)
138 return -1;
139 }
140 return fn(name, value);
141}
142
d14f7764
LT
143static int get_extended_base_var(char *name, int baselen, int c)
144{
145 do {
146 if (c == '\n')
147 return -1;
148 c = get_next_char();
149 } while (isspace(c));
150
151 /* We require the format to be '[base "extension"]' */
152 if (c != '"')
153 return -1;
154 name[baselen++] = '.';
155
156 for (;;) {
157 int c = get_next_char();
158 if (c == '\n')
159 return -1;
160 if (c == '"')
161 break;
162 if (c == '\\') {
163 c = get_next_char();
164 if (c == '\n')
165 return -1;
166 }
167 name[baselen++] = c;
168 if (baselen > MAXNAME / 2)
169 return -1;
170 }
171
172 /* Final ']' */
173 if (get_next_char() != ']')
174 return -1;
175 return baselen;
176}
177
17712991
LT
178static int get_base_var(char *name)
179{
180 int baselen = 0;
181
182 for (;;) {
183 int c = get_next_char();
184 if (c == EOF)
185 return -1;
186 if (c == ']')
187 return baselen;
d14f7764
LT
188 if (isspace(c))
189 return get_extended_base_var(name, baselen, c);
38c5afa8 190 if (!iskeychar(c) && c != '.')
17712991
LT
191 return -1;
192 if (baselen > MAXNAME / 2)
193 return -1;
194 name[baselen++] = tolower(c);
195 }
196}
197
198static int git_parse_file(config_fn_t fn)
199{
200 int comment = 0;
201 int baselen = 0;
202 static char var[MAXNAME];
203
204 for (;;) {
205 int c = get_next_char();
206 if (c == '\n') {
207 /* EOF? */
208 if (!config_file)
209 return 0;
210 comment = 0;
211 continue;
212 }
213 if (comment || isspace(c))
214 continue;
215 if (c == '#' || c == ';') {
216 comment = 1;
217 continue;
218 }
219 if (c == '[') {
220 baselen = get_base_var(var);
221 if (baselen <= 0)
222 break;
223 var[baselen++] = '.';
224 var[baselen] = 0;
225 continue;
226 }
227 if (!isalpha(c))
228 break;
128af9d1 229 var[baselen] = tolower(c);
17712991
LT
230 if (get_value(fn, var, baselen+1) < 0)
231 break;
232 }
4f629539 233 die("bad config file line %d in %s", config_linenr, config_file_name);
17712991
LT
234}
235
236int git_config_int(const char *name, const char *value)
237{
238 if (value && *value) {
239 char *end;
240 int val = strtol(value, &end, 0);
241 if (!*end)
242 return val;
d77a64d3
SP
243 if (!strcasecmp(end, "k"))
244 return val * 1024;
245 if (!strcasecmp(end, "m"))
246 return val * 1024 * 1024;
247 if (!strcasecmp(end, "g"))
248 return val * 1024 * 1024 * 1024;
17712991 249 }
4f629539 250 die("bad config value for '%s' in %s", name, config_file_name);
17712991
LT
251}
252
253int git_config_bool(const char *name, const char *value)
254{
255 if (!value)
256 return 1;
257 if (!*value)
258 return 0;
624314fd 259 if (!strcasecmp(value, "true") || !strcasecmp(value, "yes"))
17712991 260 return 1;
624314fd 261 if (!strcasecmp(value, "false") || !strcasecmp(value, "no"))
17712991
LT
262 return 0;
263 return git_config_int(name, value) != 0;
264}
265
266int git_default_config(const char *var, const char *value)
267{
268 /* This needs a better name */
269 if (!strcmp(var, "core.filemode")) {
270 trust_executable_bit = git_config_bool(var, value);
271 return 0;
272 }
273
78a8d641
JS
274 if (!strcmp(var, "core.symlinks")) {
275 has_symlinks = git_config_bool(var, value);
276 return 0;
277 }
278
7d1864ce
JH
279 if (!strcmp(var, "core.bare")) {
280 is_bare_repository_cfg = git_config_bool(var, value);
281 return 0;
282 }
283
5f73076c
JH
284 if (!strcmp(var, "core.ignorestat")) {
285 assume_unchanged = git_config_bool(var, value);
286 return 0;
287 }
288
e388c738
JH
289 if (!strcmp(var, "core.prefersymlinkrefs")) {
290 prefer_symlink_refs = git_config_bool(var, value);
f8348be3
JS
291 return 0;
292 }
293
6de08ae6
SP
294 if (!strcmp(var, "core.logallrefupdates")) {
295 log_all_ref_updates = git_config_bool(var, value);
296 return 0;
297 }
298
2f8acdb3
JH
299 if (!strcmp(var, "core.warnambiguousrefs")) {
300 warn_ambiguous_refs = git_config_bool(var, value);
301 return 0;
302 }
303
960ccca6 304 if (!strcmp(var, "core.loosecompression")) {
12f6c308
JBH
305 int level = git_config_int(var, value);
306 if (level == -1)
307 level = Z_DEFAULT_COMPRESSION;
308 else if (level < 0 || level > Z_BEST_COMPRESSION)
309 die("bad zlib compression level %d", level);
310 zlib_compression_level = level;
960ccca6
DH
311 zlib_compression_seen = 1;
312 return 0;
313 }
314
315 if (!strcmp(var, "core.compression")) {
316 int level = git_config_int(var, value);
317 if (level == -1)
318 level = Z_DEFAULT_COMPRESSION;
319 else if (level < 0 || level > Z_BEST_COMPRESSION)
320 die("bad zlib compression level %d", level);
321 core_compression_level = level;
322 core_compression_seen = 1;
323 if (!zlib_compression_seen)
324 zlib_compression_level = level;
12f6c308
JBH
325 return 0;
326 }
327
60bb8b14 328 if (!strcmp(var, "core.packedgitwindowsize")) {
5faaf246 329 int pgsz_x2 = getpagesize() * 2;
60bb8b14 330 packed_git_window_size = git_config_int(var, value);
5faaf246
JH
331
332 /* This value must be multiple of (pagesize * 2) */
333 packed_git_window_size /= pgsz_x2;
334 if (packed_git_window_size < 1)
335 packed_git_window_size = 1;
336 packed_git_window_size *= pgsz_x2;
60bb8b14
SP
337 return 0;
338 }
339
77ccc5bb
SP
340 if (!strcmp(var, "core.packedgitlimit")) {
341 packed_git_limit = git_config_int(var, value);
342 return 0;
343 }
344
18bdec11
SP
345 if (!strcmp(var, "core.deltabasecachelimit")) {
346 delta_base_cache_limit = git_config_int(var, value);
347 return 0;
348 }
349
6c510bee 350 if (!strcmp(var, "core.autocrlf")) {
d7f46334
LT
351 if (value && !strcasecmp(value, "input")) {
352 auto_crlf = -1;
353 return 0;
354 }
6c510bee
LT
355 auto_crlf = git_config_bool(var, value);
356 return 0;
357 }
358
e1b10391 359 if (!strcmp(var, "user.name")) {
817151e6 360 strlcpy(git_default_name, value, sizeof(git_default_name));
e1b10391
LT
361 return 0;
362 }
363
364 if (!strcmp(var, "user.email")) {
817151e6 365 strlcpy(git_default_email, value, sizeof(git_default_email));
e1b10391
LT
366 return 0;
367 }
368
4e72dcec 369 if (!strcmp(var, "i18n.commitencoding")) {
dbb2b41a 370 git_commit_encoding = xstrdup(value);
4e72dcec
JH
371 return 0;
372 }
373
d2c11a38 374 if (!strcmp(var, "i18n.logoutputencoding")) {
dbb2b41a 375 git_log_output_encoding = xstrdup(value);
d2c11a38
JH
376 return 0;
377 }
378
379
a159ca0c 380 if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
aa086eb8
ML
381 pager_use_color = git_config_bool(var,value);
382 return 0;
383 }
384
1ab661dd 385 /* Add other config variables here and to Documentation/config.txt. */
17712991
LT
386 return 0;
387}
388
4f629539 389int git_config_from_file(config_fn_t fn, const char *filename)
17712991
LT
390{
391 int ret;
4f629539 392 FILE *f = fopen(filename, "r");
17712991
LT
393
394 ret = -1;
395 if (f) {
396 config_file = f;
4f629539 397 config_file_name = filename;
17712991
LT
398 config_linenr = 1;
399 ret = git_parse_file(fn);
400 fclose(f);
4f629539 401 config_file_name = NULL;
17712991
LT
402 }
403 return ret;
404}
10bea152 405
4f629539
JH
406int git_config(config_fn_t fn)
407{
5f1a63e0
JS
408 int ret = 0;
409 char *repo_config = NULL;
410 const char *home = NULL, *filename;
411
412 /* $GIT_CONFIG makes git read _only_ the given config file,
413 * $GIT_CONFIG_LOCAL will make it process it in addition to the
414 * global config file, the same way it would the per-repository
415 * config file otherwise. */
d4ebc36c 416 filename = getenv(CONFIG_ENVIRONMENT);
5f1a63e0 417 if (!filename) {
32043c9f
JS
418 if (!access(ETC_GITCONFIG, R_OK))
419 ret += git_config_from_file(fn, ETC_GITCONFIG);
5f1a63e0 420 home = getenv("HOME");
d4ebc36c 421 filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
5f1a63e0 422 if (!filename)
9befac47 423 filename = repo_config = xstrdup(git_path("config"));
7f29f7a9 424 }
5f1a63e0
JS
425
426 if (home) {
9befac47 427 char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
e33d0611 428 if (!access(user_config, R_OK))
5f1a63e0
JS
429 ret = git_config_from_file(fn, user_config);
430 free(user_config);
431 }
432
433 ret += git_config_from_file(fn, filename);
4cac42b1 434 free(repo_config);
5f1a63e0 435 return ret;
4f629539
JH
436}
437
10bea152
JS
438/*
439 * Find all the stuff for git_config_set() below.
440 */
4ddba79d
JS
441
442#define MAX_MATCHES 512
443
10bea152
JS
444static struct {
445 int baselen;
446 char* key;
f98d863d 447 int do_not_match;
10bea152 448 regex_t* value_regex;
4ddba79d 449 int multi_replace;
dc49cd76 450 size_t offset[MAX_MATCHES];
10bea152
JS
451 enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
452 int seen;
453} store;
454
f98d863d
JS
455static int matches(const char* key, const char* value)
456{
457 return !strcmp(key, store.key) &&
458 (store.value_regex == NULL ||
459 (store.do_not_match ^
460 !regexec(store.value_regex, value, 0, NULL, 0)));
461}
462
10bea152
JS
463static int store_aux(const char* key, const char* value)
464{
ae9ee41d
JH
465 const char *ep;
466 size_t section_len;
467
10bea152
JS
468 switch (store.state) {
469 case KEY_SEEN:
f98d863d 470 if (matches(key, value)) {
4ddba79d 471 if (store.seen == 1 && store.multi_replace == 0) {
10bea152
JS
472 fprintf(stderr,
473 "Warning: %s has multiple values\n",
474 key);
4ddba79d
JS
475 } else if (store.seen >= MAX_MATCHES) {
476 fprintf(stderr, "Too many matches\n");
477 return 1;
10bea152 478 }
4ddba79d
JS
479
480 store.offset[store.seen] = ftell(config_file);
10bea152
JS
481 store.seen++;
482 }
483 break;
484 case SECTION_SEEN:
ae9ee41d
JH
485 /*
486 * What we are looking for is in store.key (both
487 * section and var), and its section part is baselen
488 * long. We found key (again, both section and var).
489 * We would want to know if this key is in the same
490 * section as what we are looking for. We already
491 * know we are in the same section as what should
492 * hold store.key.
493 */
494 ep = strrchr(key, '.');
495 section_len = ep - key;
496
497 if ((section_len != store.baselen) ||
498 memcmp(key, store.key, section_len+1)) {
10bea152
JS
499 store.state = SECTION_END_SEEN;
500 break;
ae9ee41d
JH
501 }
502
503 /*
504 * Do not increment matches: this is no match, but we
505 * just made sure we are in the desired section.
506 */
507 store.offset[store.seen] = ftell(config_file);
10bea152
JS
508 /* fallthru */
509 case SECTION_END_SEEN:
510 case START:
f98d863d 511 if (matches(key, value)) {
4ddba79d 512 store.offset[store.seen] = ftell(config_file);
10bea152
JS
513 store.state = KEY_SEEN;
514 store.seen++;
d14f7764
LT
515 } else {
516 if (strrchr(key, '.') - key == store.baselen &&
bdf0ef08 517 !strncmp(key, store.key, store.baselen)) {
93ddef3e 518 store.state = SECTION_SEEN;
bdf0ef08 519 store.offset[store.seen] = ftell(config_file);
d14f7764 520 }
bdf0ef08 521 }
10bea152
JS
522 }
523 return 0;
524}
525
b79d18c9 526static int write_error(void)
480c9e52
AW
527{
528 fprintf(stderr, "Failed to write new configuration file\n");
529
530 /* Same error code as "failed to rename". */
531 return 4;
532}
533
534static int store_write_section(int fd, const char* key)
10bea152 535{
d14f7764
LT
536 const char *dot = strchr(key, '.');
537 int len1 = store.baselen, len2 = -1;
538
539 dot = strchr(key, '.');
540 if (dot) {
541 int dotlen = dot - key;
542 if (dotlen < len1) {
543 len2 = len1 - dotlen - 1;
544 len1 = dotlen;
545 }
546 }
547
480c9e52
AW
548 if (write_in_full(fd, "[", 1) != 1 ||
549 write_in_full(fd, key, len1) != len1)
550 return 0;
d14f7764 551 if (len2 >= 0) {
480c9e52
AW
552 if (write_in_full(fd, " \"", 2) != 2)
553 return 0;
d14f7764
LT
554 while (--len2 >= 0) {
555 unsigned char c = *++dot;
556 if (c == '"')
480c9e52
AW
557 if (write_in_full(fd, "\\", 1) != 1)
558 return 0;
559 if (write_in_full(fd, &c, 1) != 1)
560 return 0;
d14f7764 561 }
480c9e52
AW
562 if (write_in_full(fd, "\"", 1) != 1)
563 return 0;
d14f7764 564 }
480c9e52
AW
565 if (write_in_full(fd, "]\n", 2) != 2)
566 return 0;
567
568 return 1;
10bea152
JS
569}
570
480c9e52 571static int store_write_pair(int fd, const char* key, const char* value)
10bea152
JS
572{
573 int i;
480c9e52 574 int length = strlen(key+store.baselen+1);
cdd4fb15
BG
575 int quote = 0;
576
577 /* Check to see if the value needs to be quoted. */
578 if (value[0] == ' ')
579 quote = 1;
580 for (i = 0; value[i]; i++)
581 if (value[i] == ';' || value[i] == '#')
582 quote = 1;
583 if (value[i-1] == ' ')
584 quote = 1;
10bea152 585
480c9e52
AW
586 if (write_in_full(fd, "\t", 1) != 1 ||
587 write_in_full(fd, key+store.baselen+1, length) != length ||
588 write_in_full(fd, " = ", 3) != 3)
589 return 0;
cdd4fb15
BG
590 if (quote && write_in_full(fd, "\"", 1) != 1)
591 return 0;
10bea152
JS
592 for (i = 0; value[i]; i++)
593 switch (value[i]) {
480c9e52
AW
594 case '\n':
595 if (write_in_full(fd, "\\n", 2) != 2)
596 return 0;
597 break;
598 case '\t':
599 if (write_in_full(fd, "\\t", 2) != 2)
600 return 0;
601 break;
602 case '"':
603 case '\\':
604 if (write_in_full(fd, "\\", 1) != 1)
605 return 0;
606 default:
607 if (write_in_full(fd, value+i, 1) != 1)
608 return 0;
609 break;
610 }
cdd4fb15
BG
611 if (quote && write_in_full(fd, "\"", 1) != 1)
612 return 0;
480c9e52
AW
613 if (write_in_full(fd, "\n", 1) != 1)
614 return 0;
615 return 1;
10bea152
JS
616}
617
dc49cd76
SP
618static ssize_t find_beginning_of_line(const char* contents, size_t size,
619 size_t offset_, int* found_bracket)
4ddba79d 620{
dc49cd76
SP
621 size_t equal_offset = size, bracket_offset = size;
622 ssize_t offset;
4ddba79d 623
a6080a0a 624 for (offset = offset_-2; offset > 0
4ddba79d
JS
625 && contents[offset] != '\n'; offset--)
626 switch (contents[offset]) {
627 case '=': equal_offset = offset; break;
628 case ']': bracket_offset = offset; break;
629 }
630 if (bracket_offset < equal_offset) {
631 *found_bracket = 1;
632 offset = bracket_offset+1;
633 } else
634 offset++;
635
636 return offset;
637}
638
10bea152
JS
639int git_config_set(const char* key, const char* value)
640{
4ddba79d 641 return git_config_set_multivar(key, value, NULL, 0);
10bea152
JS
642}
643
644/*
645 * If value==NULL, unset in (remove from) config,
646 * if value_regex!=NULL, disregard key/value pairs where value does not match.
4ddba79d
JS
647 * if multi_replace==0, nothing, or only one matching key/value is replaced,
648 * else all matching key/values (regardless how many) are removed,
649 * before the new pair is written.
10bea152
JS
650 *
651 * Returns 0 on success.
652 *
653 * This function does this:
654 *
655 * - it locks the config file by creating ".git/config.lock"
656 *
657 * - it then parses the config using store_aux() as validator to find
658 * the position on the key/value pair to replace. If it is to be unset,
659 * it must be found exactly once.
660 *
661 * - the config file is mmap()ed and the part before the match (if any) is
662 * written to the lock file, then the changed part and the rest.
663 *
664 * - the config file is removed and the lock file rename()d to it.
665 *
666 */
667int git_config_set_multivar(const char* key, const char* value,
4ddba79d 668 const char* value_regex, int multi_replace)
10bea152 669{
d14f7764 670 int i, dot;
f8ba655e 671 int fd = -1, in_fd;
dafc88b1 672 int ret;
9c3796fc
JS
673 char* config_filename;
674 char* lock_file;
b17e659d 675 const char* last_dot = strrchr(key, '.');
4ddba79d 676
d4ebc36c 677 config_filename = getenv(CONFIG_ENVIRONMENT);
9c3796fc 678 if (!config_filename) {
d4ebc36c 679 config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
9c3796fc
JS
680 if (!config_filename)
681 config_filename = git_path("config");
682 }
9befac47
SP
683 config_filename = xstrdup(config_filename);
684 lock_file = xstrdup(mkpath("%s.lock", config_filename));
9c3796fc 685
10bea152
JS
686 /*
687 * Since "key" actually contains the section name and the real
688 * key name separated by a dot, we have to know where the dot is.
689 */
b17e659d 690
dafc88b1 691 if (last_dot == NULL) {
10bea152 692 fprintf(stderr, "key does not contain a section: %s\n", key);
dafc88b1
SH
693 ret = 2;
694 goto out_free;
10bea152 695 }
b17e659d
JS
696 store.baselen = last_dot - key;
697
698 store.multi_replace = multi_replace;
10bea152
JS
699
700 /*
701 * Validate the key and while at it, lower case it for matching.
702 */
2d7320d0 703 store.key = xmalloc(strlen(key) + 1);
d14f7764
LT
704 dot = 0;
705 for (i = 0; key[i]; i++) {
706 unsigned char c = key[i];
707 if (c == '.')
708 dot = 1;
709 /* Leave the extended basename untouched.. */
710 if (!dot || i > store.baselen) {
38c5afa8 711 if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
d14f7764
LT
712 fprintf(stderr, "invalid key: %s\n", key);
713 free(store.key);
714 ret = 1;
715 goto out_free;
716 }
717 c = tolower(c);
6f71686e
JS
718 } else if (c == '\n') {
719 fprintf(stderr, "invalid key (newline): %s\n", key);
720 free(store.key);
721 ret = 1;
722 goto out_free;
d14f7764
LT
723 }
724 store.key[i] = c;
725 }
3dd94e3b 726 store.key[i] = 0;
10bea152
JS
727
728 /*
729 * The lock_file serves a purpose in addition to locking: the new
730 * contents of .git/config will be written into it.
731 */
732 fd = open(lock_file, O_WRONLY | O_CREAT | O_EXCL, 0666);
138086a7 733 if (fd < 0 || adjust_shared_perm(lock_file)) {
10bea152
JS
734 fprintf(stderr, "could not lock config file\n");
735 free(store.key);
dafc88b1
SH
736 ret = -1;
737 goto out_free;
10bea152
JS
738 }
739
740 /*
741 * If .git/config does not exist yet, write a minimal version.
742 */
88fb958b
AR
743 in_fd = open(config_filename, O_RDONLY);
744 if ( in_fd < 0 ) {
10bea152
JS
745 free(store.key);
746
88fb958b
AR
747 if ( ENOENT != errno ) {
748 error("opening %s: %s", config_filename,
749 strerror(errno));
dafc88b1
SH
750 ret = 3; /* same as "invalid config file" */
751 goto out_free;
88fb958b 752 }
10bea152
JS
753 /* if nothing to unset, error out */
754 if (value == NULL) {
dafc88b1
SH
755 ret = 5;
756 goto out_free;
10bea152
JS
757 }
758
759 store.key = (char*)key;
480c9e52 760 if (!store_write_section(fd, key) ||
93c1e079
JH
761 !store_write_pair(fd, key, value))
762 goto write_err_out;
763 } else {
88fb958b 764 struct stat st;
10bea152 765 char* contents;
dc49cd76
SP
766 size_t contents_sz, copy_begin, copy_end;
767 int i, new_line = 0;
10bea152
JS
768
769 if (value_regex == NULL)
770 store.value_regex = NULL;
771 else {
f98d863d
JS
772 if (value_regex[0] == '!') {
773 store.do_not_match = 1;
774 value_regex++;
775 } else
776 store.do_not_match = 0;
777
2d7320d0 778 store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
10bea152
JS
779 if (regcomp(store.value_regex, value_regex,
780 REG_EXTENDED)) {
7246ed43 781 fprintf(stderr, "Invalid pattern: %s\n",
10bea152
JS
782 value_regex);
783 free(store.value_regex);
dafc88b1
SH
784 ret = 6;
785 goto out_free;
10bea152
JS
786 }
787 }
788
4ddba79d 789 store.offset[0] = 0;
10bea152
JS
790 store.state = START;
791 store.seen = 0;
792
793 /*
794 * After this, store.offset will contain the *end* offset
795 * of the last match, or remain at 0 if no match was found.
796 * As a side effect, we make sure to transform only a valid
797 * existing config file.
798 */
9c3796fc 799 if (git_config_from_file(store_aux, config_filename)) {
10bea152
JS
800 fprintf(stderr, "invalid config file\n");
801 free(store.key);
802 if (store.value_regex != NULL) {
803 regfree(store.value_regex);
804 free(store.value_regex);
805 }
dafc88b1
SH
806 ret = 3;
807 goto out_free;
10bea152
JS
808 }
809
810 free(store.key);
811 if (store.value_regex != NULL) {
812 regfree(store.value_regex);
813 free(store.value_regex);
814 }
815
4ddba79d
JS
816 /* if nothing to unset, or too many matches, error out */
817 if ((store.seen == 0 && value == NULL) ||
818 (store.seen > 1 && multi_replace == 0)) {
dafc88b1
SH
819 ret = 5;
820 goto out_free;
10bea152
JS
821 }
822
88fb958b 823 fstat(in_fd, &st);
dc49cd76
SP
824 contents_sz = xsize_t(st.st_size);
825 contents = xmmap(NULL, contents_sz, PROT_READ,
10bea152
JS
826 MAP_PRIVATE, in_fd, 0);
827 close(in_fd);
828
4ddba79d
JS
829 if (store.seen == 0)
830 store.seen = 1;
831
832 for (i = 0, copy_begin = 0; i < store.seen; i++) {
833 if (store.offset[i] == 0) {
dc49cd76 834 store.offset[i] = copy_end = contents_sz;
4ddba79d
JS
835 } else if (store.state != KEY_SEEN) {
836 copy_end = store.offset[i];
10bea152 837 } else
4ddba79d 838 copy_end = find_beginning_of_line(
dc49cd76 839 contents, contents_sz,
4ddba79d
JS
840 store.offset[i]-2, &new_line);
841
842 /* write the first part of the config */
843 if (copy_end > copy_begin) {
93c1e079
JH
844 if (write_in_full(fd, contents + copy_begin,
845 copy_end - copy_begin) <
846 copy_end - copy_begin)
847 goto write_err_out;
848 if (new_line &&
849 write_in_full(fd, "\n", 1) != 1)
850 goto write_err_out;
4ddba79d
JS
851 }
852 copy_begin = store.offset[i];
10bea152
JS
853 }
854
10bea152
JS
855 /* write the pair (value == NULL means unset) */
856 if (value != NULL) {
93c1e079
JH
857 if (store.state == START) {
858 if (!store_write_section(fd, key))
859 goto write_err_out;
480c9e52 860 }
93c1e079
JH
861 if (!store_write_pair(fd, key, value))
862 goto write_err_out;
10bea152
JS
863 }
864
865 /* write the rest of the config */
dc49cd76 866 if (copy_begin < contents_sz)
93c1e079 867 if (write_in_full(fd, contents + copy_begin,
dc49cd76
SP
868 contents_sz - copy_begin) <
869 contents_sz - copy_begin)
93c1e079 870 goto write_err_out;
10bea152 871
dc49cd76 872 munmap(contents, contents_sz);
3a2f2bb3 873 unlink(config_filename);
10bea152
JS
874 }
875
3a2f2bb3 876 if (rename(lock_file, config_filename) < 0) {
10bea152 877 fprintf(stderr, "Could not rename the lock file?\n");
dafc88b1
SH
878 ret = 4;
879 goto out_free;
10bea152
JS
880 }
881
dafc88b1
SH
882 ret = 0;
883
884out_free:
f8ba655e
JH
885 if (0 <= fd)
886 close(fd);
4cac42b1 887 free(config_filename);
f8ba655e
JH
888 if (lock_file) {
889 unlink(lock_file);
dafc88b1 890 free(lock_file);
f8ba655e 891 }
dafc88b1 892 return ret;
93c1e079
JH
893
894write_err_out:
895 ret = write_error();
896 goto out_free;
897
10bea152
JS
898}
899
118f8b24
PB
900static int section_name_match (const char *buf, const char *name)
901{
902 int i = 0, j = 0, dot = 0;
903 for (; buf[i] && buf[i] != ']'; i++) {
904 if (!dot && isspace(buf[i])) {
905 dot = 1;
906 if (name[j++] != '.')
907 break;
908 for (i++; isspace(buf[i]); i++)
909 ; /* do nothing */
910 if (buf[i] != '"')
911 break;
912 continue;
913 }
914 if (buf[i] == '\\' && dot)
915 i++;
916 else if (buf[i] == '"' && dot) {
917 for (i++; isspace(buf[i]); i++)
918 ; /* do_nothing */
919 break;
920 }
921 if (buf[i] != name[j++])
922 break;
923 }
924 return (buf[i] == ']' && name[j] == 0);
925}
926
927/* if new_name == NULL, the section is removed instead */
0667fcfb
JS
928int git_config_rename_section(const char *old_name, const char *new_name)
929{
118f8b24 930 int ret = 0, remove = 0;
fc1905bb 931 char *config_filename;
0667fcfb
JS
932 struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
933 int out_fd;
934 char buf[1024];
935
d4ebc36c 936 config_filename = getenv(CONFIG_ENVIRONMENT);
0667fcfb 937 if (!config_filename) {
d4ebc36c 938 config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
0667fcfb
JS
939 if (!config_filename)
940 config_filename = git_path("config");
941 }
942 config_filename = xstrdup(config_filename);
943 out_fd = hold_lock_file_for_update(lock, config_filename, 0);
fc1905bb
JH
944 if (out_fd < 0) {
945 ret = error("Could not lock config file!");
946 goto out;
947 }
0667fcfb 948
fc1905bb 949 if (!(config_file = fopen(config_filename, "rb"))) {
01ebb9dc
GB
950 /* no config file means nothing to rename, no error */
951 goto unlock_and_out;
fc1905bb 952 }
0667fcfb
JS
953
954 while (fgets(buf, sizeof(buf), config_file)) {
955 int i;
480c9e52 956 int length;
0667fcfb
JS
957 for (i = 0; buf[i] && isspace(buf[i]); i++)
958 ; /* do nothing */
959 if (buf[i] == '[') {
960 /* it's a section */
118f8b24
PB
961 if (section_name_match (&buf[i+1], old_name)) {
962 ret++;
963 if (new_name == NULL) {
964 remove = 1;
0667fcfb
JS
965 continue;
966 }
0667fcfb 967 store.baselen = strlen(new_name);
480c9e52
AW
968 if (!store_write_section(out_fd, new_name)) {
969 ret = write_error();
970 goto out;
971 }
0667fcfb
JS
972 continue;
973 }
118f8b24 974 remove = 0;
0667fcfb 975 }
118f8b24
PB
976 if (remove)
977 continue;
480c9e52
AW
978 length = strlen(buf);
979 if (write_in_full(out_fd, buf, length) != length) {
980 ret = write_error();
981 goto out;
982 }
0667fcfb 983 }
fc1905bb 984 fclose(config_file);
01ebb9dc 985 unlock_and_out:
0667fcfb 986 if (close(out_fd) || commit_lock_file(lock) < 0)
480c9e52 987 ret = error("Cannot commit config file!");
fc1905bb
JH
988 out:
989 free(config_filename);
0667fcfb
JS
990 return ret;
991}