Lazy man's auto-CRLF
[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
SP
312 if (!strcmp(var, "core.packedgitwindowsize")) {
313 int pgsz = getpagesize();
314 packed_git_window_size = git_config_int(var, value);
315 packed_git_window_size /= pgsz;
40be8272
SP
316 if (packed_git_window_size < 2)
317 packed_git_window_size = 2;
60bb8b14
SP
318 packed_git_window_size *= pgsz;
319 return 0;
320 }
321
77ccc5bb
SP
322 if (!strcmp(var, "core.packedgitlimit")) {
323 packed_git_limit = git_config_int(var, value);
324 return 0;
325 }
326
6c510bee
LT
327 if (!strcmp(var, "core.autocrlf")) {
328 auto_crlf = git_config_bool(var, value);
329 return 0;
330 }
331
e1b10391 332 if (!strcmp(var, "user.name")) {
817151e6 333 strlcpy(git_default_name, value, sizeof(git_default_name));
e1b10391
LT
334 return 0;
335 }
336
337 if (!strcmp(var, "user.email")) {
817151e6 338 strlcpy(git_default_email, value, sizeof(git_default_email));
e1b10391
LT
339 return 0;
340 }
341
4e72dcec 342 if (!strcmp(var, "i18n.commitencoding")) {
d2c11a38 343 git_commit_encoding = strdup(value);
4e72dcec
JH
344 return 0;
345 }
346
d2c11a38
JH
347 if (!strcmp(var, "i18n.logoutputencoding")) {
348 git_log_output_encoding = strdup(value);
349 return 0;
350 }
351
352
a159ca0c 353 if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
aa086eb8
ML
354 pager_use_color = git_config_bool(var,value);
355 return 0;
356 }
357
1ab661dd 358 /* Add other config variables here and to Documentation/config.txt. */
17712991
LT
359 return 0;
360}
361
4f629539 362int git_config_from_file(config_fn_t fn, const char *filename)
17712991
LT
363{
364 int ret;
4f629539 365 FILE *f = fopen(filename, "r");
17712991
LT
366
367 ret = -1;
368 if (f) {
369 config_file = f;
4f629539 370 config_file_name = filename;
17712991
LT
371 config_linenr = 1;
372 ret = git_parse_file(fn);
373 fclose(f);
4f629539 374 config_file_name = NULL;
17712991
LT
375 }
376 return ret;
377}
10bea152 378
4f629539
JH
379int git_config(config_fn_t fn)
380{
5f1a63e0
JS
381 int ret = 0;
382 char *repo_config = NULL;
383 const char *home = NULL, *filename;
384
385 /* $GIT_CONFIG makes git read _only_ the given config file,
386 * $GIT_CONFIG_LOCAL will make it process it in addition to the
387 * global config file, the same way it would the per-repository
388 * config file otherwise. */
d4ebc36c 389 filename = getenv(CONFIG_ENVIRONMENT);
5f1a63e0
JS
390 if (!filename) {
391 home = getenv("HOME");
d4ebc36c 392 filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
5f1a63e0 393 if (!filename)
9befac47 394 filename = repo_config = xstrdup(git_path("config"));
7f29f7a9 395 }
5f1a63e0
JS
396
397 if (home) {
9befac47 398 char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
e33d0611 399 if (!access(user_config, R_OK))
5f1a63e0
JS
400 ret = git_config_from_file(fn, user_config);
401 free(user_config);
402 }
403
404 ret += git_config_from_file(fn, filename);
4cac42b1 405 free(repo_config);
5f1a63e0 406 return ret;
4f629539
JH
407}
408
10bea152
JS
409/*
410 * Find all the stuff for git_config_set() below.
411 */
4ddba79d
JS
412
413#define MAX_MATCHES 512
414
10bea152
JS
415static struct {
416 int baselen;
417 char* key;
f98d863d 418 int do_not_match;
10bea152 419 regex_t* value_regex;
4ddba79d
JS
420 int multi_replace;
421 off_t offset[MAX_MATCHES];
10bea152
JS
422 enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
423 int seen;
424} store;
425
f98d863d
JS
426static int matches(const char* key, const char* value)
427{
428 return !strcmp(key, store.key) &&
429 (store.value_regex == NULL ||
430 (store.do_not_match ^
431 !regexec(store.value_regex, value, 0, NULL, 0)));
432}
433
10bea152
JS
434static int store_aux(const char* key, const char* value)
435{
436 switch (store.state) {
437 case KEY_SEEN:
f98d863d 438 if (matches(key, value)) {
4ddba79d 439 if (store.seen == 1 && store.multi_replace == 0) {
10bea152
JS
440 fprintf(stderr,
441 "Warning: %s has multiple values\n",
442 key);
4ddba79d
JS
443 } else if (store.seen >= MAX_MATCHES) {
444 fprintf(stderr, "Too many matches\n");
445 return 1;
10bea152 446 }
4ddba79d
JS
447
448 store.offset[store.seen] = ftell(config_file);
10bea152
JS
449 store.seen++;
450 }
451 break;
452 case SECTION_SEEN:
453 if (strncmp(key, store.key, store.baselen+1)) {
454 store.state = SECTION_END_SEEN;
455 break;
456 } else
4ddba79d
JS
457 /* do not increment matches: this is no match */
458 store.offset[store.seen] = ftell(config_file);
10bea152
JS
459 /* fallthru */
460 case SECTION_END_SEEN:
461 case START:
f98d863d 462 if (matches(key, value)) {
4ddba79d 463 store.offset[store.seen] = ftell(config_file);
10bea152
JS
464 store.state = KEY_SEEN;
465 store.seen++;
d14f7764
LT
466 } else {
467 if (strrchr(key, '.') - key == store.baselen &&
bdf0ef08 468 !strncmp(key, store.key, store.baselen)) {
93ddef3e 469 store.state = SECTION_SEEN;
bdf0ef08 470 store.offset[store.seen] = ftell(config_file);
d14f7764 471 }
bdf0ef08 472 }
10bea152
JS
473 }
474 return 0;
475}
476
480c9e52
AW
477static int write_error()
478{
479 fprintf(stderr, "Failed to write new configuration file\n");
480
481 /* Same error code as "failed to rename". */
482 return 4;
483}
484
485static int store_write_section(int fd, const char* key)
10bea152 486{
d14f7764
LT
487 const char *dot = strchr(key, '.');
488 int len1 = store.baselen, len2 = -1;
489
490 dot = strchr(key, '.');
491 if (dot) {
492 int dotlen = dot - key;
493 if (dotlen < len1) {
494 len2 = len1 - dotlen - 1;
495 len1 = dotlen;
496 }
497 }
498
480c9e52
AW
499 if (write_in_full(fd, "[", 1) != 1 ||
500 write_in_full(fd, key, len1) != len1)
501 return 0;
d14f7764 502 if (len2 >= 0) {
480c9e52
AW
503 if (write_in_full(fd, " \"", 2) != 2)
504 return 0;
d14f7764
LT
505 while (--len2 >= 0) {
506 unsigned char c = *++dot;
507 if (c == '"')
480c9e52
AW
508 if (write_in_full(fd, "\\", 1) != 1)
509 return 0;
510 if (write_in_full(fd, &c, 1) != 1)
511 return 0;
d14f7764 512 }
480c9e52
AW
513 if (write_in_full(fd, "\"", 1) != 1)
514 return 0;
d14f7764 515 }
480c9e52
AW
516 if (write_in_full(fd, "]\n", 2) != 2)
517 return 0;
518
519 return 1;
10bea152
JS
520}
521
480c9e52 522static int store_write_pair(int fd, const char* key, const char* value)
10bea152
JS
523{
524 int i;
480c9e52 525 int length = strlen(key+store.baselen+1);
cdd4fb15
BG
526 int quote = 0;
527
528 /* Check to see if the value needs to be quoted. */
529 if (value[0] == ' ')
530 quote = 1;
531 for (i = 0; value[i]; i++)
532 if (value[i] == ';' || value[i] == '#')
533 quote = 1;
534 if (value[i-1] == ' ')
535 quote = 1;
10bea152 536
480c9e52
AW
537 if (write_in_full(fd, "\t", 1) != 1 ||
538 write_in_full(fd, key+store.baselen+1, length) != length ||
539 write_in_full(fd, " = ", 3) != 3)
540 return 0;
cdd4fb15
BG
541 if (quote && write_in_full(fd, "\"", 1) != 1)
542 return 0;
10bea152
JS
543 for (i = 0; value[i]; i++)
544 switch (value[i]) {
480c9e52
AW
545 case '\n':
546 if (write_in_full(fd, "\\n", 2) != 2)
547 return 0;
548 break;
549 case '\t':
550 if (write_in_full(fd, "\\t", 2) != 2)
551 return 0;
552 break;
553 case '"':
554 case '\\':
555 if (write_in_full(fd, "\\", 1) != 1)
556 return 0;
557 default:
558 if (write_in_full(fd, value+i, 1) != 1)
559 return 0;
560 break;
561 }
cdd4fb15
BG
562 if (quote && write_in_full(fd, "\"", 1) != 1)
563 return 0;
480c9e52
AW
564 if (write_in_full(fd, "\n", 1) != 1)
565 return 0;
566 return 1;
10bea152
JS
567}
568
4ddba79d
JS
569static int find_beginning_of_line(const char* contents, int size,
570 int offset_, int* found_bracket)
571{
572 int equal_offset = size, bracket_offset = size;
573 int offset;
574
575 for (offset = offset_-2; offset > 0
576 && contents[offset] != '\n'; offset--)
577 switch (contents[offset]) {
578 case '=': equal_offset = offset; break;
579 case ']': bracket_offset = offset; break;
580 }
581 if (bracket_offset < equal_offset) {
582 *found_bracket = 1;
583 offset = bracket_offset+1;
584 } else
585 offset++;
586
587 return offset;
588}
589
10bea152
JS
590int git_config_set(const char* key, const char* value)
591{
4ddba79d 592 return git_config_set_multivar(key, value, NULL, 0);
10bea152
JS
593}
594
595/*
596 * If value==NULL, unset in (remove from) config,
597 * if value_regex!=NULL, disregard key/value pairs where value does not match.
4ddba79d
JS
598 * if multi_replace==0, nothing, or only one matching key/value is replaced,
599 * else all matching key/values (regardless how many) are removed,
600 * before the new pair is written.
10bea152
JS
601 *
602 * Returns 0 on success.
603 *
604 * This function does this:
605 *
606 * - it locks the config file by creating ".git/config.lock"
607 *
608 * - it then parses the config using store_aux() as validator to find
609 * the position on the key/value pair to replace. If it is to be unset,
610 * it must be found exactly once.
611 *
612 * - the config file is mmap()ed and the part before the match (if any) is
613 * written to the lock file, then the changed part and the rest.
614 *
615 * - the config file is removed and the lock file rename()d to it.
616 *
617 */
618int git_config_set_multivar(const char* key, const char* value,
4ddba79d 619 const char* value_regex, int multi_replace)
10bea152 620{
d14f7764 621 int i, dot;
f8ba655e 622 int fd = -1, in_fd;
dafc88b1 623 int ret;
9c3796fc
JS
624 char* config_filename;
625 char* lock_file;
b17e659d 626 const char* last_dot = strrchr(key, '.');
4ddba79d 627
d4ebc36c 628 config_filename = getenv(CONFIG_ENVIRONMENT);
9c3796fc 629 if (!config_filename) {
d4ebc36c 630 config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
9c3796fc
JS
631 if (!config_filename)
632 config_filename = git_path("config");
633 }
9befac47
SP
634 config_filename = xstrdup(config_filename);
635 lock_file = xstrdup(mkpath("%s.lock", config_filename));
9c3796fc 636
10bea152
JS
637 /*
638 * Since "key" actually contains the section name and the real
639 * key name separated by a dot, we have to know where the dot is.
640 */
b17e659d 641
dafc88b1 642 if (last_dot == NULL) {
10bea152 643 fprintf(stderr, "key does not contain a section: %s\n", key);
dafc88b1
SH
644 ret = 2;
645 goto out_free;
10bea152 646 }
b17e659d
JS
647 store.baselen = last_dot - key;
648
649 store.multi_replace = multi_replace;
10bea152
JS
650
651 /*
652 * Validate the key and while at it, lower case it for matching.
653 */
2d7320d0 654 store.key = xmalloc(strlen(key) + 1);
d14f7764
LT
655 dot = 0;
656 for (i = 0; key[i]; i++) {
657 unsigned char c = key[i];
658 if (c == '.')
659 dot = 1;
660 /* Leave the extended basename untouched.. */
661 if (!dot || i > store.baselen) {
38c5afa8 662 if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
d14f7764
LT
663 fprintf(stderr, "invalid key: %s\n", key);
664 free(store.key);
665 ret = 1;
666 goto out_free;
667 }
668 c = tolower(c);
6f71686e
JS
669 } else if (c == '\n') {
670 fprintf(stderr, "invalid key (newline): %s\n", key);
671 free(store.key);
672 ret = 1;
673 goto out_free;
d14f7764
LT
674 }
675 store.key[i] = c;
676 }
3dd94e3b 677 store.key[i] = 0;
10bea152
JS
678
679 /*
680 * The lock_file serves a purpose in addition to locking: the new
681 * contents of .git/config will be written into it.
682 */
683 fd = open(lock_file, O_WRONLY | O_CREAT | O_EXCL, 0666);
138086a7 684 if (fd < 0 || adjust_shared_perm(lock_file)) {
10bea152
JS
685 fprintf(stderr, "could not lock config file\n");
686 free(store.key);
dafc88b1
SH
687 ret = -1;
688 goto out_free;
10bea152
JS
689 }
690
691 /*
692 * If .git/config does not exist yet, write a minimal version.
693 */
88fb958b
AR
694 in_fd = open(config_filename, O_RDONLY);
695 if ( in_fd < 0 ) {
10bea152
JS
696 free(store.key);
697
88fb958b
AR
698 if ( ENOENT != errno ) {
699 error("opening %s: %s", config_filename,
700 strerror(errno));
dafc88b1
SH
701 ret = 3; /* same as "invalid config file" */
702 goto out_free;
88fb958b 703 }
10bea152
JS
704 /* if nothing to unset, error out */
705 if (value == NULL) {
dafc88b1
SH
706 ret = 5;
707 goto out_free;
10bea152
JS
708 }
709
710 store.key = (char*)key;
480c9e52 711 if (!store_write_section(fd, key) ||
93c1e079
JH
712 !store_write_pair(fd, key, value))
713 goto write_err_out;
714 } else {
88fb958b 715 struct stat st;
10bea152 716 char* contents;
4ddba79d 717 int i, copy_begin, copy_end, new_line = 0;
10bea152
JS
718
719 if (value_regex == NULL)
720 store.value_regex = NULL;
721 else {
f98d863d
JS
722 if (value_regex[0] == '!') {
723 store.do_not_match = 1;
724 value_regex++;
725 } else
726 store.do_not_match = 0;
727
2d7320d0 728 store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
10bea152
JS
729 if (regcomp(store.value_regex, value_regex,
730 REG_EXTENDED)) {
7246ed43 731 fprintf(stderr, "Invalid pattern: %s\n",
10bea152
JS
732 value_regex);
733 free(store.value_regex);
dafc88b1
SH
734 ret = 6;
735 goto out_free;
10bea152
JS
736 }
737 }
738
4ddba79d 739 store.offset[0] = 0;
10bea152
JS
740 store.state = START;
741 store.seen = 0;
742
743 /*
744 * After this, store.offset will contain the *end* offset
745 * of the last match, or remain at 0 if no match was found.
746 * As a side effect, we make sure to transform only a valid
747 * existing config file.
748 */
9c3796fc 749 if (git_config_from_file(store_aux, config_filename)) {
10bea152
JS
750 fprintf(stderr, "invalid config file\n");
751 free(store.key);
752 if (store.value_regex != NULL) {
753 regfree(store.value_regex);
754 free(store.value_regex);
755 }
dafc88b1
SH
756 ret = 3;
757 goto out_free;
10bea152
JS
758 }
759
760 free(store.key);
761 if (store.value_regex != NULL) {
762 regfree(store.value_regex);
763 free(store.value_regex);
764 }
765
4ddba79d
JS
766 /* if nothing to unset, or too many matches, error out */
767 if ((store.seen == 0 && value == NULL) ||
768 (store.seen > 1 && multi_replace == 0)) {
dafc88b1
SH
769 ret = 5;
770 goto out_free;
10bea152
JS
771 }
772
88fb958b 773 fstat(in_fd, &st);
c4712e45 774 contents = xmmap(NULL, st.st_size, PROT_READ,
10bea152
JS
775 MAP_PRIVATE, in_fd, 0);
776 close(in_fd);
777
4ddba79d
JS
778 if (store.seen == 0)
779 store.seen = 1;
780
781 for (i = 0, copy_begin = 0; i < store.seen; i++) {
782 if (store.offset[i] == 0) {
783 store.offset[i] = copy_end = st.st_size;
784 } else if (store.state != KEY_SEEN) {
785 copy_end = store.offset[i];
10bea152 786 } else
4ddba79d
JS
787 copy_end = find_beginning_of_line(
788 contents, st.st_size,
789 store.offset[i]-2, &new_line);
790
791 /* write the first part of the config */
792 if (copy_end > copy_begin) {
93c1e079
JH
793 if (write_in_full(fd, contents + copy_begin,
794 copy_end - copy_begin) <
795 copy_end - copy_begin)
796 goto write_err_out;
797 if (new_line &&
798 write_in_full(fd, "\n", 1) != 1)
799 goto write_err_out;
4ddba79d
JS
800 }
801 copy_begin = store.offset[i];
10bea152
JS
802 }
803
10bea152
JS
804 /* write the pair (value == NULL means unset) */
805 if (value != NULL) {
93c1e079
JH
806 if (store.state == START) {
807 if (!store_write_section(fd, key))
808 goto write_err_out;
480c9e52 809 }
93c1e079
JH
810 if (!store_write_pair(fd, key, value))
811 goto write_err_out;
10bea152
JS
812 }
813
814 /* write the rest of the config */
4ddba79d 815 if (copy_begin < st.st_size)
93c1e079
JH
816 if (write_in_full(fd, contents + copy_begin,
817 st.st_size - copy_begin) <
818 st.st_size - copy_begin)
819 goto write_err_out;
10bea152
JS
820
821 munmap(contents, st.st_size);
3a2f2bb3 822 unlink(config_filename);
10bea152
JS
823 }
824
3a2f2bb3 825 if (rename(lock_file, config_filename) < 0) {
10bea152 826 fprintf(stderr, "Could not rename the lock file?\n");
dafc88b1
SH
827 ret = 4;
828 goto out_free;
10bea152
JS
829 }
830
dafc88b1
SH
831 ret = 0;
832
833out_free:
f8ba655e
JH
834 if (0 <= fd)
835 close(fd);
4cac42b1 836 free(config_filename);
f8ba655e
JH
837 if (lock_file) {
838 unlink(lock_file);
dafc88b1 839 free(lock_file);
f8ba655e 840 }
dafc88b1 841 return ret;
93c1e079
JH
842
843write_err_out:
844 ret = write_error();
845 goto out_free;
846
10bea152
JS
847}
848
0667fcfb
JS
849int git_config_rename_section(const char *old_name, const char *new_name)
850{
851 int ret = 0;
fc1905bb 852 char *config_filename;
0667fcfb
JS
853 struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
854 int out_fd;
855 char buf[1024];
856
d4ebc36c 857 config_filename = getenv(CONFIG_ENVIRONMENT);
0667fcfb 858 if (!config_filename) {
d4ebc36c 859 config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
0667fcfb
JS
860 if (!config_filename)
861 config_filename = git_path("config");
862 }
863 config_filename = xstrdup(config_filename);
864 out_fd = hold_lock_file_for_update(lock, config_filename, 0);
fc1905bb
JH
865 if (out_fd < 0) {
866 ret = error("Could not lock config file!");
867 goto out;
868 }
0667fcfb 869
fc1905bb
JH
870 if (!(config_file = fopen(config_filename, "rb"))) {
871 ret = error("Could not open config file!");
872 goto out;
873 }
0667fcfb
JS
874
875 while (fgets(buf, sizeof(buf), config_file)) {
876 int i;
480c9e52 877 int length;
0667fcfb
JS
878 for (i = 0; buf[i] && isspace(buf[i]); i++)
879 ; /* do nothing */
880 if (buf[i] == '[') {
881 /* it's a section */
882 int j = 0, dot = 0;
883 for (i++; buf[i] && buf[i] != ']'; i++) {
884 if (!dot && isspace(buf[i])) {
885 dot = 1;
886 if (old_name[j++] != '.')
887 break;
888 for (i++; isspace(buf[i]); i++)
889 ; /* do nothing */
890 if (buf[i] != '"')
891 break;
892 continue;
893 }
894 if (buf[i] == '\\' && dot)
895 i++;
896 else if (buf[i] == '"' && dot) {
897 for (i++; isspace(buf[i]); i++)
898 ; /* do_nothing */
899 break;
900 }
901 if (buf[i] != old_name[j++])
902 break;
903 }
9673a0b1 904 if (buf[i] == ']' && old_name[j] == 0) {
0667fcfb
JS
905 /* old_name matches */
906 ret++;
907 store.baselen = strlen(new_name);
480c9e52
AW
908 if (!store_write_section(out_fd, new_name)) {
909 ret = write_error();
910 goto out;
911 }
0667fcfb
JS
912 continue;
913 }
914 }
480c9e52
AW
915 length = strlen(buf);
916 if (write_in_full(out_fd, buf, length) != length) {
917 ret = write_error();
918 goto out;
919 }
0667fcfb 920 }
fc1905bb 921 fclose(config_file);
0667fcfb 922 if (close(out_fd) || commit_lock_file(lock) < 0)
480c9e52 923 ret = error("Cannot commit config file!");
fc1905bb
JH
924 out:
925 free(config_filename);
0667fcfb
JS
926 return ret;
927}
4ddba79d 928