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.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 if (!strcmp(var, "core.packedgitwindowsize")) {
313 int pgsz_x2 = getpagesize() * 2;
314 packed_git_window_size = git_config_int(var, value);
315 /* 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;
321 return 0;
322 }
323 if (!strcmp(var, "core.packedgitlimit")) {
325 packed_git_limit = git_config_int(var, value);
326 return 0;
327 }
328 if (!strcmp(var, "core.deltabasecachelimit")) {
330 delta_base_cache_limit = git_config_int(var, value);
331 return 0;
332 }
333 if (!strcmp(var, "core.autocrlf")) {
335 if (value && !strcasecmp(value, "input")) {
336 auto_crlf = -1;
337 return 0;
338 }
339 auto_crlf = git_config_bool(var, value);
340 return 0;
341 }
342 if (!strcmp(var, "user.name")) {
344 strlcpy(git_default_name, value, sizeof(git_default_name));
345 return 0;
346 }
347 if (!strcmp(var, "user.email")) {
349 strlcpy(git_default_email, value, sizeof(git_default_email));
350 return 0;
351 }
352 if (!strcmp(var, "i18n.commitencoding")) {
354 git_commit_encoding = xstrdup(value);
355 return 0;
356 }
357 if (!strcmp(var, "i18n.logoutputencoding")) {
359 git_log_output_encoding = xstrdup(value);
360 return 0;
361 }
362 if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
365 pager_use_color = git_config_bool(var,value);
366 return 0;
367 }
368 /* Add other config variables here and to Documentation/config.txt. */
370 return 0;
371}
372int git_config_from_file(config_fn_t fn, const char *filename)
374{
375 int ret;
376 FILE *f = fopen(filename, "r");
377 ret = -1;
379 if (f) {
380 config_file = f;
381 config_file_name = filename;
382 config_linenr = 1;
383 ret = git_parse_file(fn);
384 fclose(f);
385 config_file_name = NULL;
386 }
387 return ret;
388}
389int git_config(config_fn_t fn)
391{
392 int ret = 0;
393 char *repo_config = NULL;
394 const char *home = NULL, *filename;
395 /* $GIT_CONFIG makes git read _only_ the given config file,
397 * $GIT_CONFIG_LOCAL will make it process it in addition to the
398 * global config file, the same way it would the per-repository
399 * config file otherwise. */
400 filename = getenv(CONFIG_ENVIRONMENT);
401 if (!filename) {
402 if (!access(ETC_GITCONFIG, R_OK))
403 ret += git_config_from_file(fn, ETC_GITCONFIG);
404 home = getenv("HOME");
405 filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
406 if (!filename)
407 filename = repo_config = xstrdup(git_path("config"));
408 }
409 if (home) {
411 char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
412 if (!access(user_config, R_OK))
413 ret = git_config_from_file(fn, user_config);
414 free(user_config);
415 }
416 ret += git_config_from_file(fn, filename);
418 free(repo_config);
419 return ret;
420}
421/*
423 * Find all the stuff for git_config_set() below.
424 */
425#define MAX_MATCHES 512
427static struct {
429 int baselen;
430 char* key;
431 int do_not_match;
432 regex_t* value_regex;
433 int multi_replace;
434 size_t offset[MAX_MATCHES];
435 enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
436 int seen;
437} store;
438static int matches(const char* key, const char* value)
440{
441 return !strcmp(key, store.key) &&
442 (store.value_regex == NULL ||
443 (store.do_not_match ^
444 !regexec(store.value_regex, value, 0, NULL, 0)));
445}
446static int store_aux(const char* key, const char* value)
448{
449 const char *ep;
450 size_t section_len;
451 switch (store.state) {
453 case KEY_SEEN:
454 if (matches(key, value)) {
455 if (store.seen == 1 && store.multi_replace == 0) {
456 fprintf(stderr,
457 "Warning: %s has multiple values\n",
458 key);
459 } else if (store.seen >= MAX_MATCHES) {
460 fprintf(stderr, "Too many matches\n");
461 return 1;
462 }
463 store.offset[store.seen] = ftell(config_file);
465 store.seen++;
466 }
467 break;
468 case SECTION_SEEN:
469 /*
470 * What we are looking for is in store.key (both
471 * section and var), and its section part is baselen
472 * long. We found key (again, both section and var).
473 * We would want to know if this key is in the same
474 * section as what we are looking for. We already
475 * know we are in the same section as what should
476 * hold store.key.
477 */
478 ep = strrchr(key, '.');
479 section_len = ep - key;
480 if ((section_len != store.baselen) ||
482 memcmp(key, store.key, section_len+1)) {
483 store.state = SECTION_END_SEEN;
484 break;
485 }
486 /*
488 * Do not increment matches: this is no match, but we
489 * just made sure we are in the desired section.
490 */
491 store.offset[store.seen] = ftell(config_file);
492 /* fallthru */
493 case SECTION_END_SEEN:
494 case START:
495 if (matches(key, value)) {
496 store.offset[store.seen] = ftell(config_file);
497 store.state = KEY_SEEN;
498 store.seen++;
499 } else {
500 if (strrchr(key, '.') - key == store.baselen &&
501 !strncmp(key, store.key, store.baselen)) {
502 store.state = SECTION_SEEN;
503 store.offset[store.seen] = ftell(config_file);
504 }
505 }
506 }
507 return 0;
508}
509static int write_error()
511{
512 fprintf(stderr, "Failed to write new configuration file\n");
513 /* Same error code as "failed to rename". */
515 return 4;
516}
517static int store_write_section(int fd, const char* key)
519{
520 const char *dot = strchr(key, '.');
521 int len1 = store.baselen, len2 = -1;
522 dot = strchr(key, '.');
524 if (dot) {
525 int dotlen = dot - key;
526 if (dotlen < len1) {
527 len2 = len1 - dotlen - 1;
528 len1 = dotlen;
529 }
530 }
531 if (write_in_full(fd, "[", 1) != 1 ||
533 write_in_full(fd, key, len1) != len1)
534 return 0;
535 if (len2 >= 0) {
536 if (write_in_full(fd, " \"", 2) != 2)
537 return 0;
538 while (--len2 >= 0) {
539 unsigned char c = *++dot;
540 if (c == '"')
541 if (write_in_full(fd, "\\", 1) != 1)
542 return 0;
543 if (write_in_full(fd, &c, 1) != 1)
544 return 0;
545 }
546 if (write_in_full(fd, "\"", 1) != 1)
547 return 0;
548 }
549 if (write_in_full(fd, "]\n", 2) != 2)
550 return 0;
551 return 1;
553}
554static int store_write_pair(int fd, const char* key, const char* value)
556{
557 int i;
558 int length = strlen(key+store.baselen+1);
559 int quote = 0;
560 /* Check to see if the value needs to be quoted. */
562 if (value[0] == ' ')
563 quote = 1;
564 for (i = 0; value[i]; i++)
565 if (value[i] == ';' || value[i] == '#')
566 quote = 1;
567 if (value[i-1] == ' ')
568 quote = 1;
569 if (write_in_full(fd, "\t", 1) != 1 ||
571 write_in_full(fd, key+store.baselen+1, length) != length ||
572 write_in_full(fd, " = ", 3) != 3)
573 return 0;
574 if (quote && write_in_full(fd, "\"", 1) != 1)
575 return 0;
576 for (i = 0; value[i]; i++)
577 switch (value[i]) {
578 case '\n':
579 if (write_in_full(fd, "\\n", 2) != 2)
580 return 0;
581 break;
582 case '\t':
583 if (write_in_full(fd, "\\t", 2) != 2)
584 return 0;
585 break;
586 case '"':
587 case '\\':
588 if (write_in_full(fd, "\\", 1) != 1)
589 return 0;
590 default:
591 if (write_in_full(fd, value+i, 1) != 1)
592 return 0;
593 break;
594 }
595 if (quote && write_in_full(fd, "\"", 1) != 1)
596 return 0;
597 if (write_in_full(fd, "\n", 1) != 1)
598 return 0;
599 return 1;
600}
601static ssize_t find_beginning_of_line(const char* contents, size_t size,
603 size_t offset_, int* found_bracket)
604{
605 size_t equal_offset = size, bracket_offset = size;
606 ssize_t offset;
607 for (offset = offset_-2; offset > 0
609 && contents[offset] != '\n'; offset--)
610 switch (contents[offset]) {
611 case '=': equal_offset = offset; break;
612 case ']': bracket_offset = offset; break;
613 }
614 if (bracket_offset < equal_offset) {
615 *found_bracket = 1;
616 offset = bracket_offset+1;
617 } else
618 offset++;
619 return offset;
621}
622int git_config_set(const char* key, const char* value)
624{
625 return git_config_set_multivar(key, value, NULL, 0);
626}
627/*
629 * If value==NULL, unset in (remove from) config,
630 * if value_regex!=NULL, disregard key/value pairs where value does not match.
631 * if multi_replace==0, nothing, or only one matching key/value is replaced,
632 * else all matching key/values (regardless how many) are removed,
633 * before the new pair is written.
634 *
635 * Returns 0 on success.
636 *
637 * This function does this:
638 *
639 * - it locks the config file by creating ".git/config.lock"
640 *
641 * - it then parses the config using store_aux() as validator to find
642 * the position on the key/value pair to replace. If it is to be unset,
643 * it must be found exactly once.
644 *
645 * - the config file is mmap()ed and the part before the match (if any) is
646 * written to the lock file, then the changed part and the rest.
647 *
648 * - the config file is removed and the lock file rename()d to it.
649 *
650 */
651int git_config_set_multivar(const char* key, const char* value,
652 const char* value_regex, int multi_replace)
653{
654 int i, dot;
655 int fd = -1, in_fd;
656 int ret;
657 char* config_filename;
658 char* lock_file;
659 const char* last_dot = strrchr(key, '.');
660 config_filename = getenv(CONFIG_ENVIRONMENT);
662 if (!config_filename) {
663 config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
664 if (!config_filename)
665 config_filename = git_path("config");
666 }
667 config_filename = xstrdup(config_filename);
668 lock_file = xstrdup(mkpath("%s.lock", config_filename));
669 /*
671 * Since "key" actually contains the section name and the real
672 * key name separated by a dot, we have to know where the dot is.
673 */
674 if (last_dot == NULL) {
676 fprintf(stderr, "key does not contain a section: %s\n", key);
677 ret = 2;
678 goto out_free;
679 }
680 store.baselen = last_dot - key;
681 store.multi_replace = multi_replace;
683 /*
685 * Validate the key and while at it, lower case it for matching.
686 */
687 store.key = xmalloc(strlen(key) + 1);
688 dot = 0;
689 for (i = 0; key[i]; i++) {
690 unsigned char c = key[i];
691 if (c == '.')
692 dot = 1;
693 /* Leave the extended basename untouched.. */
694 if (!dot || i > store.baselen) {
695 if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
696 fprintf(stderr, "invalid key: %s\n", key);
697 free(store.key);
698 ret = 1;
699 goto out_free;
700 }
701 c = tolower(c);
702 } else if (c == '\n') {
703 fprintf(stderr, "invalid key (newline): %s\n", key);
704 free(store.key);
705 ret = 1;
706 goto out_free;
707 }
708 store.key[i] = c;
709 }
710 store.key[i] = 0;
711 /*
713 * The lock_file serves a purpose in addition to locking: the new
714 * contents of .git/config will be written into it.
715 */
716 fd = open(lock_file, O_WRONLY | O_CREAT | O_EXCL, 0666);
717 if (fd < 0 || adjust_shared_perm(lock_file)) {
718 fprintf(stderr, "could not lock config file\n");
719 free(store.key);
720 ret = -1;
721 goto out_free;
722 }
723 /*
725 * If .git/config does not exist yet, write a minimal version.
726 */
727 in_fd = open(config_filename, O_RDONLY);
728 if ( in_fd < 0 ) {
729 free(store.key);
730 if ( ENOENT != errno ) {
732 error("opening %s: %s", config_filename,
733 strerror(errno));
734 ret = 3; /* same as "invalid config file" */
735 goto out_free;
736 }
737 /* if nothing to unset, error out */
738 if (value == NULL) {
739 ret = 5;
740 goto out_free;
741 }
742 store.key = (char*)key;
744 if (!store_write_section(fd, key) ||
745 !store_write_pair(fd, key, value))
746 goto write_err_out;
747 } else {
748 struct stat st;
749 char* contents;
750 size_t contents_sz, copy_begin, copy_end;
751 int i, new_line = 0;
752 if (value_regex == NULL)
754 store.value_regex = NULL;
755 else {
756 if (value_regex[0] == '!') {
757 store.do_not_match = 1;
758 value_regex++;
759 } else
760 store.do_not_match = 0;
761 store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
763 if (regcomp(store.value_regex, value_regex,
764 REG_EXTENDED)) {
765 fprintf(stderr, "Invalid pattern: %s\n",
766 value_regex);
767 free(store.value_regex);
768 ret = 6;
769 goto out_free;
770 }
771 }
772 store.offset[0] = 0;
774 store.state = START;
775 store.seen = 0;
776 /*
778 * After this, store.offset will contain the *end* offset
779 * of the last match, or remain at 0 if no match was found.
780 * As a side effect, we make sure to transform only a valid
781 * existing config file.
782 */
783 if (git_config_from_file(store_aux, config_filename)) {
784 fprintf(stderr, "invalid config file\n");
785 free(store.key);
786 if (store.value_regex != NULL) {
787 regfree(store.value_regex);
788 free(store.value_regex);
789 }
790 ret = 3;
791 goto out_free;
792 }
793 free(store.key);
795 if (store.value_regex != NULL) {
796 regfree(store.value_regex);
797 free(store.value_regex);
798 }
799 /* if nothing to unset, or too many matches, error out */
801 if ((store.seen == 0 && value == NULL) ||
802 (store.seen > 1 && multi_replace == 0)) {
803 ret = 5;
804 goto out_free;
805 }
806 fstat(in_fd, &st);
808 contents_sz = xsize_t(st.st_size);
809 contents = xmmap(NULL, contents_sz, PROT_READ,
810 MAP_PRIVATE, in_fd, 0);
811 close(in_fd);
812 if (store.seen == 0)
814 store.seen = 1;
815 for (i = 0, copy_begin = 0; i < store.seen; i++) {
817 if (store.offset[i] == 0) {
818 store.offset[i] = copy_end = contents_sz;
819 } else if (store.state != KEY_SEEN) {
820 copy_end = store.offset[i];
821 } else
822 copy_end = find_beginning_of_line(
823 contents, contents_sz,
824 store.offset[i]-2, &new_line);
825 /* write the first part of the config */
827 if (copy_end > copy_begin) {
828 if (write_in_full(fd, contents + copy_begin,
829 copy_end - copy_begin) <
830 copy_end - copy_begin)
831 goto write_err_out;
832 if (new_line &&
833 write_in_full(fd, "\n", 1) != 1)
834 goto write_err_out;
835 }
836 copy_begin = store.offset[i];
837 }
838 /* write the pair (value == NULL means unset) */
840 if (value != NULL) {
841 if (store.state == START) {
842 if (!store_write_section(fd, key))
843 goto write_err_out;
844 }
845 if (!store_write_pair(fd, key, value))
846 goto write_err_out;
847 }
848 /* write the rest of the config */
850 if (copy_begin < contents_sz)
851 if (write_in_full(fd, contents + copy_begin,
852 contents_sz - copy_begin) <
853 contents_sz - copy_begin)
854 goto write_err_out;
855 munmap(contents, contents_sz);
857 unlink(config_filename);
858 }
859 if (rename(lock_file, config_filename) < 0) {
861 fprintf(stderr, "Could not rename the lock file?\n");
862 ret = 4;
863 goto out_free;
864 }
865 ret = 0;
867out_free:
869 if (0 <= fd)
870 close(fd);
871 free(config_filename);
872 if (lock_file) {
873 unlink(lock_file);
874 free(lock_file);
875 }
876 return ret;
877write_err_out:
879 ret = write_error();
880 goto out_free;
881}
883static int section_name_match (const char *buf, const char *name)
885{
886 int i = 0, j = 0, dot = 0;
887 for (; buf[i] && buf[i] != ']'; i++) {
888 if (!dot && isspace(buf[i])) {
889 dot = 1;
890 if (name[j++] != '.')
891 break;
892 for (i++; isspace(buf[i]); i++)
893 ; /* do nothing */
894 if (buf[i] != '"')
895 break;
896 continue;
897 }
898 if (buf[i] == '\\' && dot)
899 i++;
900 else if (buf[i] == '"' && dot) {
901 for (i++; isspace(buf[i]); i++)
902 ; /* do_nothing */
903 break;
904 }
905 if (buf[i] != name[j++])
906 break;
907 }
908 return (buf[i] == ']' && name[j] == 0);
909}
910/* if new_name == NULL, the section is removed instead */
912int git_config_rename_section(const char *old_name, const char *new_name)
913{
914 int ret = 0, remove = 0;
915 char *config_filename;
916 struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
917 int out_fd;
918 char buf[1024];
919 config_filename = getenv(CONFIG_ENVIRONMENT);
921 if (!config_filename) {
922 config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
923 if (!config_filename)
924 config_filename = git_path("config");
925 }
926 config_filename = xstrdup(config_filename);
927 out_fd = hold_lock_file_for_update(lock, config_filename, 0);
928 if (out_fd < 0) {
929 ret = error("Could not lock config file!");
930 goto out;
931 }
932 if (!(config_file = fopen(config_filename, "rb"))) {
934 /* no config file means nothing to rename, no error */
935 goto unlock_and_out;
936 }
937 while (fgets(buf, sizeof(buf), config_file)) {
939 int i;
940 int length;
941 for (i = 0; buf[i] && isspace(buf[i]); i++)
942 ; /* do nothing */
943 if (buf[i] == '[') {
944 /* it's a section */
945 if (section_name_match (&buf[i+1], old_name)) {
946 ret++;
947 if (new_name == NULL) {
948 remove = 1;
949 continue;
950 }
951 store.baselen = strlen(new_name);
952 if (!store_write_section(out_fd, new_name)) {
953 ret = write_error();
954 goto out;
955 }
956 continue;
957 }
958 remove = 0;
959 }
960 if (remove)
961 continue;
962 length = strlen(buf);
963 if (write_in_full(out_fd, buf, length) != length) {
964 ret = write_error();
965 goto out;
966 }
967 }
968 fclose(config_file);
969 unlock_and_out:
970 if (close(out_fd) || commit_lock_file(lock) < 0)
971 ret = error("Cannot commit config file!");
972 out:
973 free(config_filename);
974 return ret;
975}
976