1/*
2 * GIT - The information manager from hell
3 *
4 * Copyright (C) Linus Torvalds, 2005
5 * Copyright (C) Johannes Schindelin, 2005
6 *
7 */
8#include "cache.h"
9#define MAXNAME (256)
11static FILE *config_file;
13static const char *config_file_name;
14static int config_linenr;
15static int get_next_char(void)
16{
17 int c;
18 FILE *f;
19 c = '\n';
21 if ((f = config_file) != NULL) {
22 c = fgetc(f);
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 }
31 if (c == '\n')
32 config_linenr++;
33 if (c == EOF) {
34 config_file = NULL;
35 c = '\n';
36 }
37 }
38 return c;
39}
40static char *parse_value(void)
42{
43 static char value[1024];
44 int quote = 0, comment = 0, len = 0, space = 0;
45 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 }
62 if (!quote) {
63 if (c == ';' || c == '#') {
64 comment = 1;
65 continue;
66 }
67 }
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;
87 /* Some characters escape as themselves */
88 case '\\': case '"':
89 break;
90 /* Reject unknown escape sequences */
91 default:
92 return NULL;
93 }
94 value[len++] = c;
95 continue;
96 }
97 if (c == '"') {
98 quote = 1-quote;
99 continue;
100 }
101 value[len++] = c;
102 }
103}
104static inline int iskeychar(int c)
106{
107 return isalnum(c) || c == '-';
108}
109static int get_value(config_fn_t fn, char *name, unsigned int len)
111{
112 int c;
113 char *value;
114 /* Get the full name */
116 for (;;) {
117 c = get_next_char();
118 if (c == EOF)
119 break;
120 if (!iskeychar(c))
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 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}
140static 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 /* We require the format to be '[base "extension"]' */
150 if (c != '"')
151 return -1;
152 name[baselen++] = '.';
153 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 /* Final ']' */
171 if (get_next_char() != ']')
172 return -1;
173 return baselen;
174}
175static int get_base_var(char *name)
177{
178 int baselen = 0;
179 for (;;) {
181 int c = get_next_char();
182 if (c == EOF)
183 return -1;
184 if (c == ']')
185 return baselen;
186 if (isspace(c))
187 return get_extended_base_var(name, baselen, c);
188 if (!iskeychar(c) && c != '.')
189 return -1;
190 if (baselen > MAXNAME / 2)
191 return -1;
192 name[baselen++] = tolower(c);
193 }
194}
195static int git_parse_file(config_fn_t fn)
197{
198 int comment = 0;
199 int baselen = 0;
200 static char var[MAXNAME];
201 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;
227 var[baselen] = tolower(c);
228 if (get_value(fn, var, baselen+1) < 0)
229 break;
230 }
231 die("bad config file line %d in %s", config_linenr, config_file_name);
232}
233int 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;
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;
247 }
248 die("bad config value for '%s' in %s", name, config_file_name);
249}
250int git_config_bool(const char *name, const char *value)
252{
253 if (!value)
254 return 1;
255 if (!*value)
256 return 0;
257 if (!strcasecmp(value, "true") || !strcasecmp(value, "yes"))
258 return 1;
259 if (!strcasecmp(value, "false") || !strcasecmp(value, "no"))
260 return 0;
261 return git_config_int(name, value) != 0;
262}
263int 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 if (!strcmp(var, "core.symlinks")) {
273 has_symlinks = git_config_bool(var, value);
274 return 0;
275 }
276 if (!strcmp(var, "core.bare")) {
278 is_bare_repository_cfg = git_config_bool(var, value);
279 return 0;
280 }
281 if (!strcmp(var, "core.ignorestat")) {
283 assume_unchanged = git_config_bool(var, value);
284 return 0;
285 }
286 if (!strcmp(var, "core.prefersymlinkrefs")) {
288 prefer_symlink_refs = git_config_bool(var, value);
289 return 0;
290 }
291 if (!strcmp(var, "core.logallrefupdates")) {
293 log_all_ref_updates = git_config_bool(var, value);
294 return 0;
295 }
296 if (!strcmp(var, "core.warnambiguousrefs")) {
298 warn_ambiguous_refs = git_config_bool(var, value);
299 return 0;
300 }
301 if (!strcmp(var, "core.legacyheaders")) {
303 use_legacy_headers = git_config_bool(var, value);
304 return 0;
305 }
306 if (!strcmp(var, "core.compression")) {
308 int level = git_config_int(var, value);
309 if (level == -1)
310 level = Z_DEFAULT_COMPRESSION;
311 else if (level < 0 || level > Z_BEST_COMPRESSION)
312 die("bad zlib compression level %d", level);
313 zlib_compression_level = level;
314 return 0;
315 }
316 if (!strcmp(var, "core.packedgitwindowsize")) {
318 int pgsz_x2 = getpagesize() * 2;
319 packed_git_window_size = git_config_int(var, value);
320 /* This value must be multiple of (pagesize * 2) */
322 packed_git_window_size /= pgsz_x2;
323 if (packed_git_window_size < 1)
324 packed_git_window_size = 1;
325 packed_git_window_size *= pgsz_x2;
326 return 0;
327 }
328 if (!strcmp(var, "core.packedgitlimit")) {
330 packed_git_limit = git_config_int(var, value);
331 return 0;
332 }
333 if (!strcmp(var, "core.deltabasecachelimit")) {
335 delta_base_cache_limit = git_config_int(var, value);
336 return 0;
337 }
338 if (!strcmp(var, "core.autocrlf")) {
340 if (value && !strcasecmp(value, "input")) {
341 auto_crlf = -1;
342 return 0;
343 }
344 auto_crlf = git_config_bool(var, value);
345 return 0;
346 }
347 if (!strcmp(var, "user.name")) {
349 strlcpy(git_default_name, value, sizeof(git_default_name));
350 return 0;
351 }
352 if (!strcmp(var, "user.email")) {
354 strlcpy(git_default_email, value, sizeof(git_default_email));
355 return 0;
356 }
357 if (!strcmp(var, "i18n.commitencoding")) {
359 git_commit_encoding = xstrdup(value);
360 return 0;
361 }
362 if (!strcmp(var, "i18n.logoutputencoding")) {
364 git_log_output_encoding = xstrdup(value);
365 return 0;
366 }
367 if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
370 pager_use_color = git_config_bool(var,value);
371 return 0;
372 }
373 /* Add other config variables here and to Documentation/config.txt. */
375 return 0;
376}
377int git_config_from_file(config_fn_t fn, const char *filename)
379{
380 int ret;
381 FILE *f = fopen(filename, "r");
382 ret = -1;
384 if (f) {
385 config_file = f;
386 config_file_name = filename;
387 config_linenr = 1;
388 ret = git_parse_file(fn);
389 fclose(f);
390 config_file_name = NULL;
391 }
392 return ret;
393}
394int git_config(config_fn_t fn)
396{
397 int ret = 0;
398 char *repo_config = NULL;
399 const char *home = NULL, *filename;
400 /* $GIT_CONFIG makes git read _only_ the given config file,
402 * $GIT_CONFIG_LOCAL will make it process it in addition to the
403 * global config file, the same way it would the per-repository
404 * config file otherwise. */
405 filename = getenv(CONFIG_ENVIRONMENT);
406 if (!filename) {
407 if (!access(ETC_GITCONFIG, R_OK))
408 ret += git_config_from_file(fn, ETC_GITCONFIG);
409 home = getenv("HOME");
410 filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
411 if (!filename)
412 filename = repo_config = xstrdup(git_path("config"));
413 }
414 if (home) {
416 char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
417 if (!access(user_config, R_OK))
418 ret = git_config_from_file(fn, user_config);
419 free(user_config);
420 }
421 ret += git_config_from_file(fn, filename);
423 free(repo_config);
424 return ret;
425}
426/*
428 * Find all the stuff for git_config_set() below.
429 */
430#define MAX_MATCHES 512
432static struct {
434 int baselen;
435 char* key;
436 int do_not_match;
437 regex_t* value_regex;
438 int multi_replace;
439 size_t offset[MAX_MATCHES];
440 enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
441 int seen;
442} store;
443static int matches(const char* key, const char* value)
445{
446 return !strcmp(key, store.key) &&
447 (store.value_regex == NULL ||
448 (store.do_not_match ^
449 !regexec(store.value_regex, value, 0, NULL, 0)));
450}
451static int store_aux(const char* key, const char* value)
453{
454 switch (store.state) {
455 case KEY_SEEN:
456 if (matches(key, value)) {
457 if (store.seen == 1 && store.multi_replace == 0) {
458 fprintf(stderr,
459 "Warning: %s has multiple values\n",
460 key);
461 } else if (store.seen >= MAX_MATCHES) {
462 fprintf(stderr, "Too many matches\n");
463 return 1;
464 }
465 store.offset[store.seen] = ftell(config_file);
467 store.seen++;
468 }
469 break;
470 case SECTION_SEEN:
471 if (strncmp(key, store.key, store.baselen+1)) {
472 store.state = SECTION_END_SEEN;
473 break;
474 } else
475 /* do not increment matches: this is no match */
476 store.offset[store.seen] = ftell(config_file);
477 /* fallthru */
478 case SECTION_END_SEEN:
479 case START:
480 if (matches(key, value)) {
481 store.offset[store.seen] = ftell(config_file);
482 store.state = KEY_SEEN;
483 store.seen++;
484 } else {
485 if (strrchr(key, '.') - key == store.baselen &&
486 !strncmp(key, store.key, store.baselen)) {
487 store.state = SECTION_SEEN;
488 store.offset[store.seen] = ftell(config_file);
489 }
490 }
491 }
492 return 0;
493}
494static int write_error()
496{
497 fprintf(stderr, "Failed to write new configuration file\n");
498 /* Same error code as "failed to rename". */
500 return 4;
501}
502static int store_write_section(int fd, const char* key)
504{
505 const char *dot = strchr(key, '.');
506 int len1 = store.baselen, len2 = -1;
507 dot = strchr(key, '.');
509 if (dot) {
510 int dotlen = dot - key;
511 if (dotlen < len1) {
512 len2 = len1 - dotlen - 1;
513 len1 = dotlen;
514 }
515 }
516 if (write_in_full(fd, "[", 1) != 1 ||
518 write_in_full(fd, key, len1) != len1)
519 return 0;
520 if (len2 >= 0) {
521 if (write_in_full(fd, " \"", 2) != 2)
522 return 0;
523 while (--len2 >= 0) {
524 unsigned char c = *++dot;
525 if (c == '"')
526 if (write_in_full(fd, "\\", 1) != 1)
527 return 0;
528 if (write_in_full(fd, &c, 1) != 1)
529 return 0;
530 }
531 if (write_in_full(fd, "\"", 1) != 1)
532 return 0;
533 }
534 if (write_in_full(fd, "]\n", 2) != 2)
535 return 0;
536 return 1;
538}
539static int store_write_pair(int fd, const char* key, const char* value)
541{
542 int i;
543 int length = strlen(key+store.baselen+1);
544 int quote = 0;
545 /* Check to see if the value needs to be quoted. */
547 if (value[0] == ' ')
548 quote = 1;
549 for (i = 0; value[i]; i++)
550 if (value[i] == ';' || value[i] == '#')
551 quote = 1;
552 if (value[i-1] == ' ')
553 quote = 1;
554 if (write_in_full(fd, "\t", 1) != 1 ||
556 write_in_full(fd, key+store.baselen+1, length) != length ||
557 write_in_full(fd, " = ", 3) != 3)
558 return 0;
559 if (quote && write_in_full(fd, "\"", 1) != 1)
560 return 0;
561 for (i = 0; value[i]; i++)
562 switch (value[i]) {
563 case '\n':
564 if (write_in_full(fd, "\\n", 2) != 2)
565 return 0;
566 break;
567 case '\t':
568 if (write_in_full(fd, "\\t", 2) != 2)
569 return 0;
570 break;
571 case '"':
572 case '\\':
573 if (write_in_full(fd, "\\", 1) != 1)
574 return 0;
575 default:
576 if (write_in_full(fd, value+i, 1) != 1)
577 return 0;
578 break;
579 }
580 if (quote && write_in_full(fd, "\"", 1) != 1)
581 return 0;
582 if (write_in_full(fd, "\n", 1) != 1)
583 return 0;
584 return 1;
585}
586static ssize_t find_beginning_of_line(const char* contents, size_t size,
588 size_t offset_, int* found_bracket)
589{
590 size_t equal_offset = size, bracket_offset = size;
591 ssize_t offset;
592 for (offset = offset_-2; offset > 0
594 && contents[offset] != '\n'; offset--)
595 switch (contents[offset]) {
596 case '=': equal_offset = offset; break;
597 case ']': bracket_offset = offset; break;
598 }
599 if (bracket_offset < equal_offset) {
600 *found_bracket = 1;
601 offset = bracket_offset+1;
602 } else
603 offset++;
604 return offset;
606}
607int git_config_set(const char* key, const char* value)
609{
610 return git_config_set_multivar(key, value, NULL, 0);
611}
612/*
614 * If value==NULL, unset in (remove from) config,
615 * if value_regex!=NULL, disregard key/value pairs where value does not match.
616 * if multi_replace==0, nothing, or only one matching key/value is replaced,
617 * else all matching key/values (regardless how many) are removed,
618 * before the new pair is written.
619 *
620 * Returns 0 on success.
621 *
622 * This function does this:
623 *
624 * - it locks the config file by creating ".git/config.lock"
625 *
626 * - it then parses the config using store_aux() as validator to find
627 * the position on the key/value pair to replace. If it is to be unset,
628 * it must be found exactly once.
629 *
630 * - the config file is mmap()ed and the part before the match (if any) is
631 * written to the lock file, then the changed part and the rest.
632 *
633 * - the config file is removed and the lock file rename()d to it.
634 *
635 */
636int git_config_set_multivar(const char* key, const char* value,
637 const char* value_regex, int multi_replace)
638{
639 int i, dot;
640 int fd = -1, in_fd;
641 int ret;
642 char* config_filename;
643 char* lock_file;
644 const char* last_dot = strrchr(key, '.');
645 config_filename = getenv(CONFIG_ENVIRONMENT);
647 if (!config_filename) {
648 config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
649 if (!config_filename)
650 config_filename = git_path("config");
651 }
652 config_filename = xstrdup(config_filename);
653 lock_file = xstrdup(mkpath("%s.lock", config_filename));
654 /*
656 * Since "key" actually contains the section name and the real
657 * key name separated by a dot, we have to know where the dot is.
658 */
659 if (last_dot == NULL) {
661 fprintf(stderr, "key does not contain a section: %s\n", key);
662 ret = 2;
663 goto out_free;
664 }
665 store.baselen = last_dot - key;
666 store.multi_replace = multi_replace;
668 /*
670 * Validate the key and while at it, lower case it for matching.
671 */
672 store.key = xmalloc(strlen(key) + 1);
673 dot = 0;
674 for (i = 0; key[i]; i++) {
675 unsigned char c = key[i];
676 if (c == '.')
677 dot = 1;
678 /* Leave the extended basename untouched.. */
679 if (!dot || i > store.baselen) {
680 if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
681 fprintf(stderr, "invalid key: %s\n", key);
682 free(store.key);
683 ret = 1;
684 goto out_free;
685 }
686 c = tolower(c);
687 } else if (c == '\n') {
688 fprintf(stderr, "invalid key (newline): %s\n", key);
689 free(store.key);
690 ret = 1;
691 goto out_free;
692 }
693 store.key[i] = c;
694 }
695 store.key[i] = 0;
696 /*
698 * The lock_file serves a purpose in addition to locking: the new
699 * contents of .git/config will be written into it.
700 */
701 fd = open(lock_file, O_WRONLY | O_CREAT | O_EXCL, 0666);
702 if (fd < 0 || adjust_shared_perm(lock_file)) {
703 fprintf(stderr, "could not lock config file\n");
704 free(store.key);
705 ret = -1;
706 goto out_free;
707 }
708 /*
710 * If .git/config does not exist yet, write a minimal version.
711 */
712 in_fd = open(config_filename, O_RDONLY);
713 if ( in_fd < 0 ) {
714 free(store.key);
715 if ( ENOENT != errno ) {
717 error("opening %s: %s", config_filename,
718 strerror(errno));
719 ret = 3; /* same as "invalid config file" */
720 goto out_free;
721 }
722 /* if nothing to unset, error out */
723 if (value == NULL) {
724 ret = 5;
725 goto out_free;
726 }
727 store.key = (char*)key;
729 if (!store_write_section(fd, key) ||
730 !store_write_pair(fd, key, value))
731 goto write_err_out;
732 } else {
733 struct stat st;
734 char* contents;
735 size_t contents_sz, copy_begin, copy_end;
736 int i, new_line = 0;
737 if (value_regex == NULL)
739 store.value_regex = NULL;
740 else {
741 if (value_regex[0] == '!') {
742 store.do_not_match = 1;
743 value_regex++;
744 } else
745 store.do_not_match = 0;
746 store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
748 if (regcomp(store.value_regex, value_regex,
749 REG_EXTENDED)) {
750 fprintf(stderr, "Invalid pattern: %s\n",
751 value_regex);
752 free(store.value_regex);
753 ret = 6;
754 goto out_free;
755 }
756 }
757 store.offset[0] = 0;
759 store.state = START;
760 store.seen = 0;
761 /*
763 * After this, store.offset will contain the *end* offset
764 * of the last match, or remain at 0 if no match was found.
765 * As a side effect, we make sure to transform only a valid
766 * existing config file.
767 */
768 if (git_config_from_file(store_aux, config_filename)) {
769 fprintf(stderr, "invalid config file\n");
770 free(store.key);
771 if (store.value_regex != NULL) {
772 regfree(store.value_regex);
773 free(store.value_regex);
774 }
775 ret = 3;
776 goto out_free;
777 }
778 free(store.key);
780 if (store.value_regex != NULL) {
781 regfree(store.value_regex);
782 free(store.value_regex);
783 }
784 /* if nothing to unset, or too many matches, error out */
786 if ((store.seen == 0 && value == NULL) ||
787 (store.seen > 1 && multi_replace == 0)) {
788 ret = 5;
789 goto out_free;
790 }
791 fstat(in_fd, &st);
793 contents_sz = xsize_t(st.st_size);
794 contents = xmmap(NULL, contents_sz, PROT_READ,
795 MAP_PRIVATE, in_fd, 0);
796 close(in_fd);
797 if (store.seen == 0)
799 store.seen = 1;
800 for (i = 0, copy_begin = 0; i < store.seen; i++) {
802 if (store.offset[i] == 0) {
803 store.offset[i] = copy_end = contents_sz;
804 } else if (store.state != KEY_SEEN) {
805 copy_end = store.offset[i];
806 } else
807 copy_end = find_beginning_of_line(
808 contents, contents_sz,
809 store.offset[i]-2, &new_line);
810 /* write the first part of the config */
812 if (copy_end > copy_begin) {
813 if (write_in_full(fd, contents + copy_begin,
814 copy_end - copy_begin) <
815 copy_end - copy_begin)
816 goto write_err_out;
817 if (new_line &&
818 write_in_full(fd, "\n", 1) != 1)
819 goto write_err_out;
820 }
821 copy_begin = store.offset[i];
822 }
823 /* write the pair (value == NULL means unset) */
825 if (value != NULL) {
826 if (store.state == START) {
827 if (!store_write_section(fd, key))
828 goto write_err_out;
829 }
830 if (!store_write_pair(fd, key, value))
831 goto write_err_out;
832 }
833 /* write the rest of the config */
835 if (copy_begin < contents_sz)
836 if (write_in_full(fd, contents + copy_begin,
837 contents_sz - copy_begin) <
838 contents_sz - copy_begin)
839 goto write_err_out;
840 munmap(contents, contents_sz);
842 unlink(config_filename);
843 }
844 if (rename(lock_file, config_filename) < 0) {
846 fprintf(stderr, "Could not rename the lock file?\n");
847 ret = 4;
848 goto out_free;
849 }
850 ret = 0;
852out_free:
854 if (0 <= fd)
855 close(fd);
856 free(config_filename);
857 if (lock_file) {
858 unlink(lock_file);
859 free(lock_file);
860 }
861 return ret;
862write_err_out:
864 ret = write_error();
865 goto out_free;
866}
868static int section_name_match (const char *buf, const char *name)
870{
871 int i = 0, j = 0, dot = 0;
872 for (; buf[i] && buf[i] != ']'; i++) {
873 if (!dot && isspace(buf[i])) {
874 dot = 1;
875 if (name[j++] != '.')
876 break;
877 for (i++; isspace(buf[i]); i++)
878 ; /* do nothing */
879 if (buf[i] != '"')
880 break;
881 continue;
882 }
883 if (buf[i] == '\\' && dot)
884 i++;
885 else if (buf[i] == '"' && dot) {
886 for (i++; isspace(buf[i]); i++)
887 ; /* do_nothing */
888 break;
889 }
890 if (buf[i] != name[j++])
891 break;
892 }
893 return (buf[i] == ']' && name[j] == 0);
894}
895/* if new_name == NULL, the section is removed instead */
897int git_config_rename_section(const char *old_name, const char *new_name)
898{
899 int ret = 0, remove = 0;
900 char *config_filename;
901 struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
902 int out_fd;
903 char buf[1024];
904 config_filename = getenv(CONFIG_ENVIRONMENT);
906 if (!config_filename) {
907 config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
908 if (!config_filename)
909 config_filename = git_path("config");
910 }
911 config_filename = xstrdup(config_filename);
912 out_fd = hold_lock_file_for_update(lock, config_filename, 0);
913 if (out_fd < 0) {
914 ret = error("Could not lock config file!");
915 goto out;
916 }
917 if (!(config_file = fopen(config_filename, "rb"))) {
919 /* no config file means nothing to rename, no error */
920 goto unlock_and_out;
921 }
922 while (fgets(buf, sizeof(buf), config_file)) {
924 int i;
925 int length;
926 for (i = 0; buf[i] && isspace(buf[i]); i++)
927 ; /* do nothing */
928 if (buf[i] == '[') {
929 /* it's a section */
930 if (section_name_match (&buf[i+1], old_name)) {
931 ret++;
932 if (new_name == NULL) {
933 remove = 1;
934 continue;
935 }
936 store.baselen = strlen(new_name);
937 if (!store_write_section(out_fd, new_name)) {
938 ret = write_error();
939 goto out;
940 }
941 continue;
942 }
943 remove = 0;
944 }
945 if (remove)
946 continue;
947 length = strlen(buf);
948 if (write_in_full(out_fd, buf, length) != length) {
949 ret = write_error();
950 goto out;
951 }
952 }
953 fclose(config_file);
954 unlock_and_out:
955 if (close(out_fd) || commit_lock_file(lock) < 0)
956 ret = error("Cannot commit config file!");
957 out:
958 free(config_filename);
959 return ret;
960}
961