Merge branch 'maint'
[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
LT
14static int config_linenr;
15static int get_next_char(void)
16{
17 int c;
18 FILE *f;
19
20 c = '\n';
21 if ((f = config_file) != NULL) {
22 c = fgetc(f);
db2c075d
JH
23 if (c == '\r') {
24 /* DOS like systems */
25 c = fgetc(f);
26 if (c != '\n') {
27 ungetc(c, f);
28 c = '\r';
29 }
30 }
17712991
LT
31 if (c == '\n')
32 config_linenr++;
33 if (c == EOF) {
34 config_file = NULL;
35 c = '\n';
36 }
37 }
38 return c;
39}
40
41static char *parse_value(void)
42{
43 static char value[1024];
44 int quote = 0, comment = 0, len = 0, space = 0;
45
46 for (;;) {
47 int c = get_next_char();
48 if (len >= sizeof(value))
49 return NULL;
50 if (c == '\n') {
51 if (quote)
52 return NULL;
53 value[len] = 0;
54 return value;
55 }
56 if (comment)
57 continue;
58 if (isspace(c) && !quote) {
59 space = 1;
60 continue;
61 }
7ebdba61
JS
62 if (!quote) {
63 if (c == ';' || c == '#') {
64 comment = 1;
65 continue;
66 }
67 }
17712991
LT
68 if (space) {
69 if (len)
70 value[len++] = ' ';
71 space = 0;
72 }
73 if (c == '\\') {
74 c = get_next_char();
75 switch (c) {
76 case '\n':
77 continue;
78 case 't':
79 c = '\t';
80 break;
81 case 'b':
82 c = '\b';
83 break;
84 case 'n':
85 c = '\n';
86 break;
5cbb401d
LT
87 /* Some characters escape as themselves */
88 case '\\': case '"':
89 break;
90 /* Reject unknown escape sequences */
91 default:
92 return NULL;
17712991
LT
93 }
94 value[len++] = c;
95 continue;
96 }
97 if (c == '"') {
98 quote = 1-quote;
99 continue;
100 }
17712991
LT
101 value[len++] = c;
102 }
103}
104
38c5afa8
LT
105static inline int iskeychar(int c)
106{
107 return isalnum(c) || c == '-';
108}
109
17712991
LT
110static int get_value(config_fn_t fn, char *name, unsigned int len)
111{
112 int c;
113 char *value;
114
115 /* Get the full name */
116 for (;;) {
117 c = get_next_char();
118 if (c == EOF)
119 break;
38c5afa8 120 if (!iskeychar(c))
17712991
LT
121 break;
122 name[len++] = tolower(c);
123 if (len >= MAXNAME)
124 return -1;
125 }
126 name[len] = 0;
127 while (c == ' ' || c == '\t')
128 c = get_next_char();
129
130 value = NULL;
131 if (c != '\n') {
132 if (c != '=')
133 return -1;
134 value = parse_value();
135 if (!value)
136 return -1;
137 }
138 return fn(name, value);
139}
140
d14f7764
LT
141static int get_extended_base_var(char *name, int baselen, int c)
142{
143 do {
144 if (c == '\n')
145 return -1;
146 c = get_next_char();
147 } while (isspace(c));
148
149 /* We require the format to be '[base "extension"]' */
150 if (c != '"')
151 return -1;
152 name[baselen++] = '.';
153
154 for (;;) {
155 int c = get_next_char();
156 if (c == '\n')
157 return -1;
158 if (c == '"')
159 break;
160 if (c == '\\') {
161 c = get_next_char();
162 if (c == '\n')
163 return -1;
164 }
165 name[baselen++] = c;
166 if (baselen > MAXNAME / 2)
167 return -1;
168 }
169
170 /* Final ']' */
171 if (get_next_char() != ']')
172 return -1;
173 return baselen;
174}
175
17712991
LT
176static int get_base_var(char *name)
177{
178 int baselen = 0;
179
180 for (;;) {
181 int c = get_next_char();
182 if (c == EOF)
183 return -1;
184 if (c == ']')
185 return baselen;
d14f7764
LT
186 if (isspace(c))
187 return get_extended_base_var(name, baselen, c);
38c5afa8 188 if (!iskeychar(c) && c != '.')
17712991
LT
189 return -1;
190 if (baselen > MAXNAME / 2)
191 return -1;
192 name[baselen++] = tolower(c);
193 }
194}
195
196static int git_parse_file(config_fn_t fn)
197{
198 int comment = 0;
199 int baselen = 0;
200 static char var[MAXNAME];
201
202 for (;;) {
203 int c = get_next_char();
204 if (c == '\n') {
205 /* EOF? */
206 if (!config_file)
207 return 0;
208 comment = 0;
209 continue;
210 }
211 if (comment || isspace(c))
212 continue;
213 if (c == '#' || c == ';') {
214 comment = 1;
215 continue;
216 }
217 if (c == '[') {
218 baselen = get_base_var(var);
219 if (baselen <= 0)
220 break;
221 var[baselen++] = '.';
222 var[baselen] = 0;
223 continue;
224 }
225 if (!isalpha(c))
226 break;
128af9d1 227 var[baselen] = tolower(c);
17712991
LT
228 if (get_value(fn, var, baselen+1) < 0)
229 break;
230 }
4f629539 231 die("bad config file line %d in %s", config_linenr, config_file_name);
17712991
LT
232}
233
234int git_config_int(const char *name, const char *value)
235{
236 if (value && *value) {
237 char *end;
238 int val = strtol(value, &end, 0);
239 if (!*end)
240 return val;
d77a64d3
SP
241 if (!strcasecmp(end, "k"))
242 return val * 1024;
243 if (!strcasecmp(end, "m"))
244 return val * 1024 * 1024;
245 if (!strcasecmp(end, "g"))
246 return val * 1024 * 1024 * 1024;
17712991 247 }
4f629539 248 die("bad config value for '%s' in %s", name, config_file_name);
17712991
LT
249}
250
251int git_config_bool(const char *name, const char *value)
252{
253 if (!value)
254 return 1;
255 if (!*value)
256 return 0;
624314fd 257 if (!strcasecmp(value, "true") || !strcasecmp(value, "yes"))
17712991 258 return 1;
624314fd 259 if (!strcasecmp(value, "false") || !strcasecmp(value, "no"))
17712991
LT
260 return 0;
261 return git_config_int(name, value) != 0;
262}
263
264int git_default_config(const char *var, const char *value)
265{
266 /* This needs a better name */
267 if (!strcmp(var, "core.filemode")) {
268 trust_executable_bit = git_config_bool(var, value);
269 return 0;
270 }
271
7d1864ce
JH
272 if (!strcmp(var, "core.bare")) {
273 is_bare_repository_cfg = git_config_bool(var, value);
274 return 0;
275 }
276
5f73076c
JH
277 if (!strcmp(var, "core.ignorestat")) {
278 assume_unchanged = git_config_bool(var, value);
279 return 0;
280 }
281
e388c738
JH
282 if (!strcmp(var, "core.prefersymlinkrefs")) {
283 prefer_symlink_refs = git_config_bool(var, value);
f8348be3
JS
284 return 0;
285 }
286
6de08ae6
SP
287 if (!strcmp(var, "core.logallrefupdates")) {
288 log_all_ref_updates = git_config_bool(var, value);
289 return 0;
290 }
291
2f8acdb3
JH
292 if (!strcmp(var, "core.warnambiguousrefs")) {
293 warn_ambiguous_refs = git_config_bool(var, value);
294 return 0;
295 }
296
93821bd9
LT
297 if (!strcmp(var, "core.legacyheaders")) {
298 use_legacy_headers = git_config_bool(var, value);
299 return 0;
300 }
301
12f6c308
JBH
302 if (!strcmp(var, "core.compression")) {
303 int level = git_config_int(var, value);
304 if (level == -1)
305 level = Z_DEFAULT_COMPRESSION;
306 else if (level < 0 || level > Z_BEST_COMPRESSION)
307 die("bad zlib compression level %d", level);
308 zlib_compression_level = level;
309 return 0;
310 }
311
60bb8b14 312 if (!strcmp(var, "core.packedgitwindowsize")) {
5faaf246 313 int pgsz_x2 = getpagesize() * 2;
60bb8b14 314 packed_git_window_size = git_config_int(var, value);
5faaf246
JH
315
316 /* This value must be multiple of (pagesize * 2) */
317 packed_git_window_size /= pgsz_x2;
318 if (packed_git_window_size < 1)
319 packed_git_window_size = 1;
320 packed_git_window_size *= pgsz_x2;
60bb8b14
SP
321 return 0;
322 }
323
77ccc5bb
SP
324 if (!strcmp(var, "core.packedgitlimit")) {
325 packed_git_limit = git_config_int(var, value);
326 return 0;
327 }
328
6c510bee 329 if (!strcmp(var, "core.autocrlf")) {
d7f46334
LT
330 if (value && !strcasecmp(value, "input")) {
331 auto_crlf = -1;
332 return 0;
333 }
6c510bee
LT
334 auto_crlf = git_config_bool(var, value);
335 return 0;
336 }
337
e1b10391 338 if (!strcmp(var, "user.name")) {
817151e6 339 strlcpy(git_default_name, value, sizeof(git_default_name));
e1b10391
LT
340 return 0;
341 }
342
343 if (!strcmp(var, "user.email")) {
817151e6 344 strlcpy(git_default_email, value, sizeof(git_default_email));
e1b10391
LT
345 return 0;
346 }
347
4e72dcec 348 if (!strcmp(var, "i18n.commitencoding")) {
d2c11a38 349 git_commit_encoding = strdup(value);
4e72dcec
JH
350 return 0;
351 }
352
d2c11a38
JH
353 if (!strcmp(var, "i18n.logoutputencoding")) {
354 git_log_output_encoding = strdup(value);
355 return 0;
356 }
357
358
a159ca0c 359 if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
aa086eb8
ML
360 pager_use_color = git_config_bool(var,value);
361 return 0;
362 }
363
1ab661dd 364 /* Add other config variables here and to Documentation/config.txt. */
17712991
LT
365 return 0;
366}
367
4f629539 368int git_config_from_file(config_fn_t fn, const char *filename)
17712991
LT
369{
370 int ret;
4f629539 371 FILE *f = fopen(filename, "r");
17712991
LT
372
373 ret = -1;
374 if (f) {
375 config_file = f;
4f629539 376 config_file_name = filename;
17712991
LT
377 config_linenr = 1;
378 ret = git_parse_file(fn);
379 fclose(f);
4f629539 380 config_file_name = NULL;
17712991
LT
381 }
382 return ret;
383}
10bea152 384
4f629539
JH
385int git_config(config_fn_t fn)
386{
5f1a63e0
JS
387 int ret = 0;
388 char *repo_config = NULL;
389 const char *home = NULL, *filename;
390
391 /* $GIT_CONFIG makes git read _only_ the given config file,
392 * $GIT_CONFIG_LOCAL will make it process it in addition to the
393 * global config file, the same way it would the per-repository
394 * config file otherwise. */
d4ebc36c 395 filename = getenv(CONFIG_ENVIRONMENT);
5f1a63e0 396 if (!filename) {
32043c9f
JS
397 if (!access(ETC_GITCONFIG, R_OK))
398 ret += git_config_from_file(fn, ETC_GITCONFIG);
5f1a63e0 399 home = getenv("HOME");
d4ebc36c 400 filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
5f1a63e0 401 if (!filename)
9befac47 402 filename = repo_config = xstrdup(git_path("config"));
7f29f7a9 403 }
5f1a63e0
JS
404
405 if (home) {
9befac47 406 char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
e33d0611 407 if (!access(user_config, R_OK))
5f1a63e0
JS
408 ret = git_config_from_file(fn, user_config);
409 free(user_config);
410 }
411
412 ret += git_config_from_file(fn, filename);
4cac42b1 413 free(repo_config);
5f1a63e0 414 return ret;
4f629539
JH
415}
416
10bea152
JS
417/*
418 * Find all the stuff for git_config_set() below.
419 */
4ddba79d
JS
420
421#define MAX_MATCHES 512
422
10bea152
JS
423static struct {
424 int baselen;
425 char* key;
f98d863d 426 int do_not_match;
10bea152 427 regex_t* value_regex;
4ddba79d
JS
428 int multi_replace;
429 off_t offset[MAX_MATCHES];
10bea152
JS
430 enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
431 int seen;
432} store;
433
f98d863d
JS
434static int matches(const char* key, const char* value)
435{
436 return !strcmp(key, store.key) &&
437 (store.value_regex == NULL ||
438 (store.do_not_match ^
439 !regexec(store.value_regex, value, 0, NULL, 0)));
440}
441
10bea152
JS
442static int store_aux(const char* key, const char* value)
443{
444 switch (store.state) {
445 case KEY_SEEN:
f98d863d 446 if (matches(key, value)) {
4ddba79d 447 if (store.seen == 1 && store.multi_replace == 0) {
10bea152
JS
448 fprintf(stderr,
449 "Warning: %s has multiple values\n",
450 key);
4ddba79d
JS
451 } else if (store.seen >= MAX_MATCHES) {
452 fprintf(stderr, "Too many matches\n");
453 return 1;
10bea152 454 }
4ddba79d
JS
455
456 store.offset[store.seen] = ftell(config_file);
10bea152
JS
457 store.seen++;
458 }
459 break;
460 case SECTION_SEEN:
461 if (strncmp(key, store.key, store.baselen+1)) {
462 store.state = SECTION_END_SEEN;
463 break;
464 } else
4ddba79d
JS
465 /* do not increment matches: this is no match */
466 store.offset[store.seen] = ftell(config_file);
10bea152
JS
467 /* fallthru */
468 case SECTION_END_SEEN:
469 case START:
f98d863d 470 if (matches(key, value)) {
4ddba79d 471 store.offset[store.seen] = ftell(config_file);
10bea152
JS
472 store.state = KEY_SEEN;
473 store.seen++;
d14f7764
LT
474 } else {
475 if (strrchr(key, '.') - key == store.baselen &&
bdf0ef08 476 !strncmp(key, store.key, store.baselen)) {
93ddef3e 477 store.state = SECTION_SEEN;
bdf0ef08 478 store.offset[store.seen] = ftell(config_file);
d14f7764 479 }
bdf0ef08 480 }
10bea152
JS
481 }
482 return 0;
483}
484
480c9e52
AW
485static int write_error()
486{
487 fprintf(stderr, "Failed to write new configuration file\n");
488
489 /* Same error code as "failed to rename". */
490 return 4;
491}
492
493static int store_write_section(int fd, const char* key)
10bea152 494{
d14f7764
LT
495 const char *dot = strchr(key, '.');
496 int len1 = store.baselen, len2 = -1;
497
498 dot = strchr(key, '.');
499 if (dot) {
500 int dotlen = dot - key;
501 if (dotlen < len1) {
502 len2 = len1 - dotlen - 1;
503 len1 = dotlen;
504 }
505 }
506
480c9e52
AW
507 if (write_in_full(fd, "[", 1) != 1 ||
508 write_in_full(fd, key, len1) != len1)
509 return 0;
d14f7764 510 if (len2 >= 0) {
480c9e52
AW
511 if (write_in_full(fd, " \"", 2) != 2)
512 return 0;
d14f7764
LT
513 while (--len2 >= 0) {
514 unsigned char c = *++dot;
515 if (c == '"')
480c9e52
AW
516 if (write_in_full(fd, "\\", 1) != 1)
517 return 0;
518 if (write_in_full(fd, &c, 1) != 1)
519 return 0;
d14f7764 520 }
480c9e52
AW
521 if (write_in_full(fd, "\"", 1) != 1)
522 return 0;
d14f7764 523 }
480c9e52
AW
524 if (write_in_full(fd, "]\n", 2) != 2)
525 return 0;
526
527 return 1;
10bea152
JS
528}
529
480c9e52 530static int store_write_pair(int fd, const char* key, const char* value)
10bea152
JS
531{
532 int i;
480c9e52 533 int length = strlen(key+store.baselen+1);
cdd4fb15
BG
534 int quote = 0;
535
536 /* Check to see if the value needs to be quoted. */
537 if (value[0] == ' ')
538 quote = 1;
539 for (i = 0; value[i]; i++)
540 if (value[i] == ';' || value[i] == '#')
541 quote = 1;
542 if (value[i-1] == ' ')
543 quote = 1;
10bea152 544
480c9e52
AW
545 if (write_in_full(fd, "\t", 1) != 1 ||
546 write_in_full(fd, key+store.baselen+1, length) != length ||
547 write_in_full(fd, " = ", 3) != 3)
548 return 0;
cdd4fb15
BG
549 if (quote && write_in_full(fd, "\"", 1) != 1)
550 return 0;
10bea152
JS
551 for (i = 0; value[i]; i++)
552 switch (value[i]) {
480c9e52
AW
553 case '\n':
554 if (write_in_full(fd, "\\n", 2) != 2)
555 return 0;
556 break;
557 case '\t':
558 if (write_in_full(fd, "\\t", 2) != 2)
559 return 0;
560 break;
561 case '"':
562 case '\\':
563 if (write_in_full(fd, "\\", 1) != 1)
564 return 0;
565 default:
566 if (write_in_full(fd, value+i, 1) != 1)
567 return 0;
568 break;
569 }
cdd4fb15
BG
570 if (quote && write_in_full(fd, "\"", 1) != 1)
571 return 0;
480c9e52
AW
572 if (write_in_full(fd, "\n", 1) != 1)
573 return 0;
574 return 1;
10bea152
JS
575}
576
4ddba79d
JS
577static int find_beginning_of_line(const char* contents, int size,
578 int offset_, int* found_bracket)
579{
580 int equal_offset = size, bracket_offset = size;
581 int offset;
582
583 for (offset = offset_-2; offset > 0
584 && contents[offset] != '\n'; offset--)
585 switch (contents[offset]) {
586 case '=': equal_offset = offset; break;
587 case ']': bracket_offset = offset; break;
588 }
589 if (bracket_offset < equal_offset) {
590 *found_bracket = 1;
591 offset = bracket_offset+1;
592 } else
593 offset++;
594
595 return offset;
596}
597
10bea152
JS
598int git_config_set(const char* key, const char* value)
599{
4ddba79d 600 return git_config_set_multivar(key, value, NULL, 0);
10bea152
JS
601}
602
603/*
604 * If value==NULL, unset in (remove from) config,
605 * if value_regex!=NULL, disregard key/value pairs where value does not match.
4ddba79d
JS
606 * if multi_replace==0, nothing, or only one matching key/value is replaced,
607 * else all matching key/values (regardless how many) are removed,
608 * before the new pair is written.
10bea152
JS
609 *
610 * Returns 0 on success.
611 *
612 * This function does this:
613 *
614 * - it locks the config file by creating ".git/config.lock"
615 *
616 * - it then parses the config using store_aux() as validator to find
617 * the position on the key/value pair to replace. If it is to be unset,
618 * it must be found exactly once.
619 *
620 * - the config file is mmap()ed and the part before the match (if any) is
621 * written to the lock file, then the changed part and the rest.
622 *
623 * - the config file is removed and the lock file rename()d to it.
624 *
625 */
626int git_config_set_multivar(const char* key, const char* value,
4ddba79d 627 const char* value_regex, int multi_replace)
10bea152 628{
d14f7764 629 int i, dot;
f8ba655e 630 int fd = -1, in_fd;
dafc88b1 631 int ret;
9c3796fc
JS
632 char* config_filename;
633 char* lock_file;
b17e659d 634 const char* last_dot = strrchr(key, '.');
4ddba79d 635
d4ebc36c 636 config_filename = getenv(CONFIG_ENVIRONMENT);
9c3796fc 637 if (!config_filename) {
d4ebc36c 638 config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
9c3796fc
JS
639 if (!config_filename)
640 config_filename = git_path("config");
641 }
9befac47
SP
642 config_filename = xstrdup(config_filename);
643 lock_file = xstrdup(mkpath("%s.lock", config_filename));
9c3796fc 644
10bea152
JS
645 /*
646 * Since "key" actually contains the section name and the real
647 * key name separated by a dot, we have to know where the dot is.
648 */
b17e659d 649
dafc88b1 650 if (last_dot == NULL) {
10bea152 651 fprintf(stderr, "key does not contain a section: %s\n", key);
dafc88b1
SH
652 ret = 2;
653 goto out_free;
10bea152 654 }
b17e659d
JS
655 store.baselen = last_dot - key;
656
657 store.multi_replace = multi_replace;
10bea152
JS
658
659 /*
660 * Validate the key and while at it, lower case it for matching.
661 */
2d7320d0 662 store.key = xmalloc(strlen(key) + 1);
d14f7764
LT
663 dot = 0;
664 for (i = 0; key[i]; i++) {
665 unsigned char c = key[i];
666 if (c == '.')
667 dot = 1;
668 /* Leave the extended basename untouched.. */
669 if (!dot || i > store.baselen) {
38c5afa8 670 if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
d14f7764
LT
671 fprintf(stderr, "invalid key: %s\n", key);
672 free(store.key);
673 ret = 1;
674 goto out_free;
675 }
676 c = tolower(c);
6f71686e
JS
677 } else if (c == '\n') {
678 fprintf(stderr, "invalid key (newline): %s\n", key);
679 free(store.key);
680 ret = 1;
681 goto out_free;
d14f7764
LT
682 }
683 store.key[i] = c;
684 }
3dd94e3b 685 store.key[i] = 0;
10bea152
JS
686
687 /*
688 * The lock_file serves a purpose in addition to locking: the new
689 * contents of .git/config will be written into it.
690 */
691 fd = open(lock_file, O_WRONLY | O_CREAT | O_EXCL, 0666);
138086a7 692 if (fd < 0 || adjust_shared_perm(lock_file)) {
10bea152
JS
693 fprintf(stderr, "could not lock config file\n");
694 free(store.key);
dafc88b1
SH
695 ret = -1;
696 goto out_free;
10bea152
JS
697 }
698
699 /*
700 * If .git/config does not exist yet, write a minimal version.
701 */
88fb958b
AR
702 in_fd = open(config_filename, O_RDONLY);
703 if ( in_fd < 0 ) {
10bea152
JS
704 free(store.key);
705
88fb958b
AR
706 if ( ENOENT != errno ) {
707 error("opening %s: %s", config_filename,
708 strerror(errno));
dafc88b1
SH
709 ret = 3; /* same as "invalid config file" */
710 goto out_free;
88fb958b 711 }
10bea152
JS
712 /* if nothing to unset, error out */
713 if (value == NULL) {
dafc88b1
SH
714 ret = 5;
715 goto out_free;
10bea152
JS
716 }
717
718 store.key = (char*)key;
480c9e52 719 if (!store_write_section(fd, key) ||
93c1e079
JH
720 !store_write_pair(fd, key, value))
721 goto write_err_out;
722 } else {
88fb958b 723 struct stat st;
10bea152 724 char* contents;
4ddba79d 725 int i, copy_begin, copy_end, new_line = 0;
10bea152
JS
726
727 if (value_regex == NULL)
728 store.value_regex = NULL;
729 else {
f98d863d
JS
730 if (value_regex[0] == '!') {
731 store.do_not_match = 1;
732 value_regex++;
733 } else
734 store.do_not_match = 0;
735
2d7320d0 736 store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
10bea152
JS
737 if (regcomp(store.value_regex, value_regex,
738 REG_EXTENDED)) {
7246ed43 739 fprintf(stderr, "Invalid pattern: %s\n",
10bea152
JS
740 value_regex);
741 free(store.value_regex);
dafc88b1
SH
742 ret = 6;
743 goto out_free;
10bea152
JS
744 }
745 }
746
4ddba79d 747 store.offset[0] = 0;
10bea152
JS
748 store.state = START;
749 store.seen = 0;
750
751 /*
752 * After this, store.offset will contain the *end* offset
753 * of the last match, or remain at 0 if no match was found.
754 * As a side effect, we make sure to transform only a valid
755 * existing config file.
756 */
9c3796fc 757 if (git_config_from_file(store_aux, config_filename)) {
10bea152
JS
758 fprintf(stderr, "invalid config file\n");
759 free(store.key);
760 if (store.value_regex != NULL) {
761 regfree(store.value_regex);
762 free(store.value_regex);
763 }
dafc88b1
SH
764 ret = 3;
765 goto out_free;
10bea152
JS
766 }
767
768 free(store.key);
769 if (store.value_regex != NULL) {
770 regfree(store.value_regex);
771 free(store.value_regex);
772 }
773
4ddba79d
JS
774 /* if nothing to unset, or too many matches, error out */
775 if ((store.seen == 0 && value == NULL) ||
776 (store.seen > 1 && multi_replace == 0)) {
dafc88b1
SH
777 ret = 5;
778 goto out_free;
10bea152
JS
779 }
780
88fb958b 781 fstat(in_fd, &st);
c4712e45 782 contents = xmmap(NULL, st.st_size, PROT_READ,
10bea152
JS
783 MAP_PRIVATE, in_fd, 0);
784 close(in_fd);
785
4ddba79d
JS
786 if (store.seen == 0)
787 store.seen = 1;
788
789 for (i = 0, copy_begin = 0; i < store.seen; i++) {
790 if (store.offset[i] == 0) {
791 store.offset[i] = copy_end = st.st_size;
792 } else if (store.state != KEY_SEEN) {
793 copy_end = store.offset[i];
10bea152 794 } else
4ddba79d
JS
795 copy_end = find_beginning_of_line(
796 contents, st.st_size,
797 store.offset[i]-2, &new_line);
798
799 /* write the first part of the config */
800 if (copy_end > copy_begin) {
93c1e079
JH
801 if (write_in_full(fd, contents + copy_begin,
802 copy_end - copy_begin) <
803 copy_end - copy_begin)
804 goto write_err_out;
805 if (new_line &&
806 write_in_full(fd, "\n", 1) != 1)
807 goto write_err_out;
4ddba79d
JS
808 }
809 copy_begin = store.offset[i];
10bea152
JS
810 }
811
10bea152
JS
812 /* write the pair (value == NULL means unset) */
813 if (value != NULL) {
93c1e079
JH
814 if (store.state == START) {
815 if (!store_write_section(fd, key))
816 goto write_err_out;
480c9e52 817 }
93c1e079
JH
818 if (!store_write_pair(fd, key, value))
819 goto write_err_out;
10bea152
JS
820 }
821
822 /* write the rest of the config */
4ddba79d 823 if (copy_begin < st.st_size)
93c1e079
JH
824 if (write_in_full(fd, contents + copy_begin,
825 st.st_size - copy_begin) <
826 st.st_size - copy_begin)
827 goto write_err_out;
10bea152
JS
828
829 munmap(contents, st.st_size);
3a2f2bb3 830 unlink(config_filename);
10bea152
JS
831 }
832
3a2f2bb3 833 if (rename(lock_file, config_filename) < 0) {
10bea152 834 fprintf(stderr, "Could not rename the lock file?\n");
dafc88b1
SH
835 ret = 4;
836 goto out_free;
10bea152
JS
837 }
838
dafc88b1
SH
839 ret = 0;
840
841out_free:
f8ba655e
JH
842 if (0 <= fd)
843 close(fd);
4cac42b1 844 free(config_filename);
f8ba655e
JH
845 if (lock_file) {
846 unlink(lock_file);
dafc88b1 847 free(lock_file);
f8ba655e 848 }
dafc88b1 849 return ret;
93c1e079
JH
850
851write_err_out:
852 ret = write_error();
853 goto out_free;
854
10bea152
JS
855}
856
0667fcfb
JS
857int git_config_rename_section(const char *old_name, const char *new_name)
858{
859 int ret = 0;
fc1905bb 860 char *config_filename;
0667fcfb
JS
861 struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
862 int out_fd;
863 char buf[1024];
864
d4ebc36c 865 config_filename = getenv(CONFIG_ENVIRONMENT);
0667fcfb 866 if (!config_filename) {
d4ebc36c 867 config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
0667fcfb
JS
868 if (!config_filename)
869 config_filename = git_path("config");
870 }
871 config_filename = xstrdup(config_filename);
872 out_fd = hold_lock_file_for_update(lock, config_filename, 0);
fc1905bb
JH
873 if (out_fd < 0) {
874 ret = error("Could not lock config file!");
875 goto out;
876 }
0667fcfb 877
fc1905bb
JH
878 if (!(config_file = fopen(config_filename, "rb"))) {
879 ret = error("Could not open config file!");
880 goto out;
881 }
0667fcfb
JS
882
883 while (fgets(buf, sizeof(buf), config_file)) {
884 int i;
480c9e52 885 int length;
0667fcfb
JS
886 for (i = 0; buf[i] && isspace(buf[i]); i++)
887 ; /* do nothing */
888 if (buf[i] == '[') {
889 /* it's a section */
890 int j = 0, dot = 0;
891 for (i++; buf[i] && buf[i] != ']'; i++) {
892 if (!dot && isspace(buf[i])) {
893 dot = 1;
894 if (old_name[j++] != '.')
895 break;
896 for (i++; isspace(buf[i]); i++)
897 ; /* do nothing */
898 if (buf[i] != '"')
899 break;
900 continue;
901 }
902 if (buf[i] == '\\' && dot)
903 i++;
904 else if (buf[i] == '"' && dot) {
905 for (i++; isspace(buf[i]); i++)
906 ; /* do_nothing */
907 break;
908 }
909 if (buf[i] != old_name[j++])
910 break;
911 }
9673a0b1 912 if (buf[i] == ']' && old_name[j] == 0) {
0667fcfb
JS
913 /* old_name matches */
914 ret++;
915 store.baselen = strlen(new_name);
480c9e52
AW
916 if (!store_write_section(out_fd, new_name)) {
917 ret = write_error();
918 goto out;
919 }
0667fcfb
JS
920 continue;
921 }
922 }
480c9e52
AW
923 length = strlen(buf);
924 if (write_in_full(out_fd, buf, length) != length) {
925 ret = write_error();
926 goto out;
927 }
0667fcfb 928 }
fc1905bb 929 fclose(config_file);
0667fcfb 930 if (close(out_fd) || commit_lock_file(lock) < 0)
480c9e52 931 ret = error("Cannot commit config file!");
fc1905bb
JH
932 out:
933 free(config_filename);
0667fcfb
JS
934 return ret;
935}
4ddba79d 936