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 zlib_compression_seen;
16static int get_next_char(void)
18{
19 int c;
20 FILE *f;
21 c = '\n';
23 if ((f = config_file) != NULL) {
24 c = fgetc(f);
25 if (c == '\r') {
26 /* DOS like systems */
27 c = fgetc(f);
28 if (c != '\n') {
29 ungetc(c, f);
30 c = '\r';
31 }
32 }
33 if (c == '\n')
34 config_linenr++;
35 if (c == EOF) {
36 config_file = NULL;
37 c = '\n';
38 }
39 }
40 return c;
41}
42static char *parse_value(void)
44{
45 static char value[1024];
46 int quote = 0, comment = 0, len = 0, space = 0;
47 for (;;) {
49 int c = get_next_char();
50 if (len >= sizeof(value))
51 return NULL;
52 if (c == '\n') {
53 if (quote)
54 return NULL;
55 value[len] = 0;
56 return value;
57 }
58 if (comment)
59 continue;
60 if (isspace(c) && !quote) {
61 space = 1;
62 continue;
63 }
64 if (!quote) {
65 if (c == ';' || c == '#') {
66 comment = 1;
67 continue;
68 }
69 }
70 if (space) {
71 if (len)
72 value[len++] = ' ';
73 space = 0;
74 }
75 if (c == '\\') {
76 c = get_next_char();
77 switch (c) {
78 case '\n':
79 continue;
80 case 't':
81 c = '\t';
82 break;
83 case 'b':
84 c = '\b';
85 break;
86 case 'n':
87 c = '\n';
88 break;
89 /* Some characters escape as themselves */
90 case '\\': case '"':
91 break;
92 /* Reject unknown escape sequences */
93 default:
94 return NULL;
95 }
96 value[len++] = c;
97 continue;
98 }
99 if (c == '"') {
100 quote = 1-quote;
101 continue;
102 }
103 value[len++] = c;
104 }
105}
106static inline int iskeychar(int c)
108{
109 return isalnum(c) || c == '-';
110}
111static int get_value(config_fn_t fn, char *name, unsigned int len)
113{
114 int c;
115 char *value;
116 /* Get the full name */
118 for (;;) {
119 c = get_next_char();
120 if (c == EOF)
121 break;
122 if (!iskeychar(c))
123 break;
124 name[len++] = tolower(c);
125 if (len >= MAXNAME)
126 return -1;
127 }
128 name[len] = 0;
129 while (c == ' ' || c == '\t')
130 c = get_next_char();
131 value = NULL;
133 if (c != '\n') {
134 if (c != '=')
135 return -1;
136 value = parse_value();
137 if (!value)
138 return -1;
139 }
140 return fn(name, value);
141}
142static int get_extended_base_var(char *name, int baselen, int c)
144{
145 do {
146 if (c == '\n')
147 return -1;
148 c = get_next_char();
149 } while (isspace(c));
150 /* We require the format to be '[base "extension"]' */
152 if (c != '"')
153 return -1;
154 name[baselen++] = '.';
155 for (;;) {
157 int c = get_next_char();
158 if (c == '\n')
159 return -1;
160 if (c == '"')
161 break;
162 if (c == '\\') {
163 c = get_next_char();
164 if (c == '\n')
165 return -1;
166 }
167 name[baselen++] = c;
168 if (baselen > MAXNAME / 2)
169 return -1;
170 }
171 /* Final ']' */
173 if (get_next_char() != ']')
174 return -1;
175 return baselen;
176}
177static int get_base_var(char *name)
179{
180 int baselen = 0;
181 for (;;) {
183 int c = get_next_char();
184 if (c == EOF)
185 return -1;
186 if (c == ']')
187 return baselen;
188 if (isspace(c))
189 return get_extended_base_var(name, baselen, c);
190 if (!iskeychar(c) && c != '.')
191 return -1;
192 if (baselen > MAXNAME / 2)
193 return -1;
194 name[baselen++] = tolower(c);
195 }
196}
197static int git_parse_file(config_fn_t fn)
199{
200 int comment = 0;
201 int baselen = 0;
202 static char var[MAXNAME];
203 for (;;) {
205 int c = get_next_char();
206 if (c == '\n') {
207 /* EOF? */
208 if (!config_file)
209 return 0;
210 comment = 0;
211 continue;
212 }
213 if (comment || isspace(c))
214 continue;
215 if (c == '#' || c == ';') {
216 comment = 1;
217 continue;
218 }
219 if (c == '[') {
220 baselen = get_base_var(var);
221 if (baselen <= 0)
222 break;
223 var[baselen++] = '.';
224 var[baselen] = 0;
225 continue;
226 }
227 if (!isalpha(c))
228 break;
229 var[baselen] = tolower(c);
230 if (get_value(fn, var, baselen+1) < 0)
231 break;
232 }
233 die("bad config file line %d in %s", config_linenr, config_file_name);
234}
235static unsigned long get_unit_factor(const char *end)
237{
238 if (!*end)
239 return 1;
240 else if (!strcasecmp(end, "k"))
241 return 1024;
242 else if (!strcasecmp(end, "m"))
243 return 1024 * 1024;
244 else if (!strcasecmp(end, "g"))
245 return 1024 * 1024 * 1024;
246 die("unknown unit: '%s'", end);
247}
248int git_parse_long(const char *value, long *ret)
250{
251 if (value && *value) {
252 char *end;
253 long val = strtol(value, &end, 0);
254 *ret = val * get_unit_factor(end);
255 return 1;
256 }
257 return 0;
258}
259int git_parse_ulong(const char *value, unsigned long *ret)
261{
262 if (value && *value) {
263 char *end;
264 unsigned long val = strtoul(value, &end, 0);
265 *ret = val * get_unit_factor(end);
266 return 1;
267 }
268 return 0;
269}
270int git_config_int(const char *name, const char *value)
272{
273 long ret;
274 if (!git_parse_long(value, &ret))
275 die("bad config value for '%s' in %s", name, config_file_name);
276 return ret;
277}
278unsigned long git_config_ulong(const char *name, const char *value)
280{
281 unsigned long ret;
282 if (!git_parse_ulong(value, &ret))
283 die("bad config value for '%s' in %s", name, config_file_name);
284 return ret;
285}
286int git_config_bool(const char *name, const char *value)
288{
289 if (!value)
290 return 1;
291 if (!*value)
292 return 0;
293 if (!strcasecmp(value, "true") || !strcasecmp(value, "yes"))
294 return 1;
295 if (!strcasecmp(value, "false") || !strcasecmp(value, "no"))
296 return 0;
297 return git_config_int(name, value) != 0;
298}
299int git_default_config(const char *var, const char *value)
301{
302 /* This needs a better name */
303 if (!strcmp(var, "core.filemode")) {
304 trust_executable_bit = git_config_bool(var, value);
305 return 0;
306 }
307 if (!strcmp(var, "core.quotepath")) {
309 quote_path_fully = git_config_bool(var, value);
310 return 0;
311 }
312 if (!strcmp(var, "core.symlinks")) {
314 has_symlinks = git_config_bool(var, value);
315 return 0;
316 }
317 if (!strcmp(var, "core.bare")) {
319 is_bare_repository_cfg = git_config_bool(var, value);
320 return 0;
321 }
322 if (!strcmp(var, "core.ignorestat")) {
324 assume_unchanged = git_config_bool(var, value);
325 return 0;
326 }
327 if (!strcmp(var, "core.prefersymlinkrefs")) {
329 prefer_symlink_refs = git_config_bool(var, value);
330 return 0;
331 }
332 if (!strcmp(var, "core.logallrefupdates")) {
334 log_all_ref_updates = git_config_bool(var, value);
335 return 0;
336 }
337 if (!strcmp(var, "core.warnambiguousrefs")) {
339 warn_ambiguous_refs = git_config_bool(var, value);
340 return 0;
341 }
342 if (!strcmp(var, "core.loosecompression")) {
344 int level = git_config_int(var, value);
345 if (level == -1)
346 level = Z_DEFAULT_COMPRESSION;
347 else if (level < 0 || level > Z_BEST_COMPRESSION)
348 die("bad zlib compression level %d", level);
349 zlib_compression_level = level;
350 zlib_compression_seen = 1;
351 return 0;
352 }
353 if (!strcmp(var, "core.compression")) {
355 int level = git_config_int(var, value);
356 if (level == -1)
357 level = Z_DEFAULT_COMPRESSION;
358 else if (level < 0 || level > Z_BEST_COMPRESSION)
359 die("bad zlib compression level %d", level);
360 core_compression_level = level;
361 core_compression_seen = 1;
362 if (!zlib_compression_seen)
363 zlib_compression_level = level;
364 return 0;
365 }
366 if (!strcmp(var, "core.packedgitwindowsize")) {
368 int pgsz_x2 = getpagesize() * 2;
369 packed_git_window_size = git_config_int(var, value);
370 /* This value must be multiple of (pagesize * 2) */
372 packed_git_window_size /= pgsz_x2;
373 if (packed_git_window_size < 1)
374 packed_git_window_size = 1;
375 packed_git_window_size *= pgsz_x2;
376 return 0;
377 }
378 if (!strcmp(var, "core.packedgitlimit")) {
380 packed_git_limit = git_config_int(var, value);
381 return 0;
382 }
383 if (!strcmp(var, "core.deltabasecachelimit")) {
385 delta_base_cache_limit = git_config_int(var, value);
386 return 0;
387 }
388 if (!strcmp(var, "core.autocrlf")) {
390 if (value && !strcasecmp(value, "input")) {
391 auto_crlf = -1;
392 return 0;
393 }
394 auto_crlf = git_config_bool(var, value);
395 return 0;
396 }
397 if (!strcmp(var, "user.name")) {
399 strlcpy(git_default_name, value, sizeof(git_default_name));
400 return 0;
401 }
402 if (!strcmp(var, "user.email")) {
404 strlcpy(git_default_email, value, sizeof(git_default_email));
405 return 0;
406 }
407 if (!strcmp(var, "i18n.commitencoding")) {
409 git_commit_encoding = xstrdup(value);
410 return 0;
411 }
412 if (!strcmp(var, "i18n.logoutputencoding")) {
414 git_log_output_encoding = xstrdup(value);
415 return 0;
416 }
417 if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
420 pager_use_color = git_config_bool(var,value);
421 return 0;
422 }
423 if (!strcmp(var, "core.pager")) {
425 pager_program = xstrdup(value);
426 return 0;
427 }
428 if (!strcmp(var, "core.editor")) {
430 editor_program = xstrdup(value);
431 return 0;
432 }
433 /* Add other config variables here and to Documentation/config.txt. */
435 return 0;
436}
437int git_config_from_file(config_fn_t fn, const char *filename)
439{
440 int ret;
441 FILE *f = fopen(filename, "r");
442 ret = -1;
444 if (f) {
445 config_file = f;
446 config_file_name = filename;
447 config_linenr = 1;
448 ret = git_parse_file(fn);
449 fclose(f);
450 config_file_name = NULL;
451 }
452 return ret;
453}
454int git_config(config_fn_t fn)
456{
457 int ret = 0;
458 char *repo_config = NULL;
459 const char *home = NULL, *filename;
460 /* $GIT_CONFIG makes git read _only_ the given config file,
462 * $GIT_CONFIG_LOCAL will make it process it in addition to the
463 * global config file, the same way it would the per-repository
464 * config file otherwise. */
465 filename = getenv(CONFIG_ENVIRONMENT);
466 if (!filename) {
467 if (!access(ETC_GITCONFIG, R_OK))
468 ret += git_config_from_file(fn, ETC_GITCONFIG);
469 home = getenv("HOME");
470 filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
471 if (!filename)
472 filename = repo_config = xstrdup(git_path("config"));
473 }
474 if (home) {
476 char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
477 if (!access(user_config, R_OK))
478 ret = git_config_from_file(fn, user_config);
479 free(user_config);
480 }
481 ret += git_config_from_file(fn, filename);
483 free(repo_config);
484 return ret;
485}
486/*
488 * Find all the stuff for git_config_set() below.
489 */
490#define MAX_MATCHES 512
492static struct {
494 int baselen;
495 char* key;
496 int do_not_match;
497 regex_t* value_regex;
498 int multi_replace;
499 size_t offset[MAX_MATCHES];
500 enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
501 int seen;
502} store;
503static int matches(const char* key, const char* value)
505{
506 return !strcmp(key, store.key) &&
507 (store.value_regex == NULL ||
508 (store.do_not_match ^
509 !regexec(store.value_regex, value, 0, NULL, 0)));
510}
511static int store_aux(const char* key, const char* value)
513{
514 const char *ep;
515 size_t section_len;
516 switch (store.state) {
518 case KEY_SEEN:
519 if (matches(key, value)) {
520 if (store.seen == 1 && store.multi_replace == 0) {
521 fprintf(stderr,
522 "Warning: %s has multiple values\n",
523 key);
524 } else if (store.seen >= MAX_MATCHES) {
525 fprintf(stderr, "Too many matches\n");
526 return 1;
527 }
528 store.offset[store.seen] = ftell(config_file);
530 store.seen++;
531 }
532 break;
533 case SECTION_SEEN:
534 /*
535 * What we are looking for is in store.key (both
536 * section and var), and its section part is baselen
537 * long. We found key (again, both section and var).
538 * We would want to know if this key is in the same
539 * section as what we are looking for. We already
540 * know we are in the same section as what should
541 * hold store.key.
542 */
543 ep = strrchr(key, '.');
544 section_len = ep - key;
545 if ((section_len != store.baselen) ||
547 memcmp(key, store.key, section_len+1)) {
548 store.state = SECTION_END_SEEN;
549 break;
550 }
551 /*
553 * Do not increment matches: this is no match, but we
554 * just made sure we are in the desired section.
555 */
556 store.offset[store.seen] = ftell(config_file);
557 /* fallthru */
558 case SECTION_END_SEEN:
559 case START:
560 if (matches(key, value)) {
561 store.offset[store.seen] = ftell(config_file);
562 store.state = KEY_SEEN;
563 store.seen++;
564 } else {
565 if (strrchr(key, '.') - key == store.baselen &&
566 !strncmp(key, store.key, store.baselen)) {
567 store.state = SECTION_SEEN;
568 store.offset[store.seen] = ftell(config_file);
569 }
570 }
571 }
572 return 0;
573}
574static int write_error(void)
576{
577 fprintf(stderr, "Failed to write new configuration file\n");
578 /* Same error code as "failed to rename". */
580 return 4;
581}
582static int store_write_section(int fd, const char* key)
584{
585 const char *dot = strchr(key, '.');
586 int len1 = store.baselen, len2 = -1;
587 dot = strchr(key, '.');
589 if (dot) {
590 int dotlen = dot - key;
591 if (dotlen < len1) {
592 len2 = len1 - dotlen - 1;
593 len1 = dotlen;
594 }
595 }
596 if (write_in_full(fd, "[", 1) != 1 ||
598 write_in_full(fd, key, len1) != len1)
599 return 0;
600 if (len2 >= 0) {
601 if (write_in_full(fd, " \"", 2) != 2)
602 return 0;
603 while (--len2 >= 0) {
604 unsigned char c = *++dot;
605 if (c == '"')
606 if (write_in_full(fd, "\\", 1) != 1)
607 return 0;
608 if (write_in_full(fd, &c, 1) != 1)
609 return 0;
610 }
611 if (write_in_full(fd, "\"", 1) != 1)
612 return 0;
613 }
614 if (write_in_full(fd, "]\n", 2) != 2)
615 return 0;
616 return 1;
618}
619static int store_write_pair(int fd, const char* key, const char* value)
621{
622 int i;
623 int length = strlen(key+store.baselen+1);
624 int quote = 0;
625 /* Check to see if the value needs to be quoted. */
627 if (value[0] == ' ')
628 quote = 1;
629 for (i = 0; value[i]; i++)
630 if (value[i] == ';' || value[i] == '#')
631 quote = 1;
632 if (value[i-1] == ' ')
633 quote = 1;
634 if (write_in_full(fd, "\t", 1) != 1 ||
636 write_in_full(fd, key+store.baselen+1, length) != length ||
637 write_in_full(fd, " = ", 3) != 3)
638 return 0;
639 if (quote && write_in_full(fd, "\"", 1) != 1)
640 return 0;
641 for (i = 0; value[i]; i++)
642 switch (value[i]) {
643 case '\n':
644 if (write_in_full(fd, "\\n", 2) != 2)
645 return 0;
646 break;
647 case '\t':
648 if (write_in_full(fd, "\\t", 2) != 2)
649 return 0;
650 break;
651 case '"':
652 case '\\':
653 if (write_in_full(fd, "\\", 1) != 1)
654 return 0;
655 default:
656 if (write_in_full(fd, value+i, 1) != 1)
657 return 0;
658 break;
659 }
660 if (quote && write_in_full(fd, "\"", 1) != 1)
661 return 0;
662 if (write_in_full(fd, "\n", 1) != 1)
663 return 0;
664 return 1;
665}
666static ssize_t find_beginning_of_line(const char* contents, size_t size,
668 size_t offset_, int* found_bracket)
669{
670 size_t equal_offset = size, bracket_offset = size;
671 ssize_t offset;
672 for (offset = offset_-2; offset > 0
674 && contents[offset] != '\n'; offset--)
675 switch (contents[offset]) {
676 case '=': equal_offset = offset; break;
677 case ']': bracket_offset = offset; break;
678 }
679 if (bracket_offset < equal_offset) {
680 *found_bracket = 1;
681 offset = bracket_offset+1;
682 } else
683 offset++;
684 return offset;
686}
687int git_config_set(const char* key, const char* value)
689{
690 return git_config_set_multivar(key, value, NULL, 0);
691}
692/*
694 * If value==NULL, unset in (remove from) config,
695 * if value_regex!=NULL, disregard key/value pairs where value does not match.
696 * if multi_replace==0, nothing, or only one matching key/value is replaced,
697 * else all matching key/values (regardless how many) are removed,
698 * before the new pair is written.
699 *
700 * Returns 0 on success.
701 *
702 * This function does this:
703 *
704 * - it locks the config file by creating ".git/config.lock"
705 *
706 * - it then parses the config using store_aux() as validator to find
707 * the position on the key/value pair to replace. If it is to be unset,
708 * it must be found exactly once.
709 *
710 * - the config file is mmap()ed and the part before the match (if any) is
711 * written to the lock file, then the changed part and the rest.
712 *
713 * - the config file is removed and the lock file rename()d to it.
714 *
715 */
716int git_config_set_multivar(const char* key, const char* value,
717 const char* value_regex, int multi_replace)
718{
719 int i, dot;
720 int fd = -1, in_fd;
721 int ret;
722 char* config_filename;
723 struct lock_file *lock = NULL;
724 const char* last_dot = strrchr(key, '.');
725 config_filename = getenv(CONFIG_ENVIRONMENT);
727 if (!config_filename) {
728 config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
729 if (!config_filename)
730 config_filename = git_path("config");
731 }
732 config_filename = xstrdup(config_filename);
733 /*
735 * Since "key" actually contains the section name and the real
736 * key name separated by a dot, we have to know where the dot is.
737 */
738 if (last_dot == NULL) {
740 fprintf(stderr, "key does not contain a section: %s\n", key);
741 ret = 2;
742 goto out_free;
743 }
744 store.baselen = last_dot - key;
745 store.multi_replace = multi_replace;
747 /*
749 * Validate the key and while at it, lower case it for matching.
750 */
751 store.key = xmalloc(strlen(key) + 1);
752 dot = 0;
753 for (i = 0; key[i]; i++) {
754 unsigned char c = key[i];
755 if (c == '.')
756 dot = 1;
757 /* Leave the extended basename untouched.. */
758 if (!dot || i > store.baselen) {
759 if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
760 fprintf(stderr, "invalid key: %s\n", key);
761 free(store.key);
762 ret = 1;
763 goto out_free;
764 }
765 c = tolower(c);
766 } else if (c == '\n') {
767 fprintf(stderr, "invalid key (newline): %s\n", key);
768 free(store.key);
769 ret = 1;
770 goto out_free;
771 }
772 store.key[i] = c;
773 }
774 store.key[i] = 0;
775 /*
777 * The lock serves a purpose in addition to locking: the new
778 * contents of .git/config will be written into it.
779 */
780 lock = xcalloc(sizeof(struct lock_file), 1);
781 fd = hold_lock_file_for_update(lock, config_filename, 0);
782 if (fd < 0) {
783 fprintf(stderr, "could not lock config file\n");
784 free(store.key);
785 ret = -1;
786 goto out_free;
787 }
788 /*
790 * If .git/config does not exist yet, write a minimal version.
791 */
792 in_fd = open(config_filename, O_RDONLY);
793 if ( in_fd < 0 ) {
794 free(store.key);
795 if ( ENOENT != errno ) {
797 error("opening %s: %s", config_filename,
798 strerror(errno));
799 ret = 3; /* same as "invalid config file" */
800 goto out_free;
801 }
802 /* if nothing to unset, error out */
803 if (value == NULL) {
804 ret = 5;
805 goto out_free;
806 }
807 store.key = (char*)key;
809 if (!store_write_section(fd, key) ||
810 !store_write_pair(fd, key, value))
811 goto write_err_out;
812 } else {
813 struct stat st;
814 char* contents;
815 size_t contents_sz, copy_begin, copy_end;
816 int i, new_line = 0;
817 if (value_regex == NULL)
819 store.value_regex = NULL;
820 else {
821 if (value_regex[0] == '!') {
822 store.do_not_match = 1;
823 value_regex++;
824 } else
825 store.do_not_match = 0;
826 store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
828 if (regcomp(store.value_regex, value_regex,
829 REG_EXTENDED)) {
830 fprintf(stderr, "Invalid pattern: %s\n",
831 value_regex);
832 free(store.value_regex);
833 ret = 6;
834 goto out_free;
835 }
836 }
837 store.offset[0] = 0;
839 store.state = START;
840 store.seen = 0;
841 /*
843 * After this, store.offset will contain the *end* offset
844 * of the last match, or remain at 0 if no match was found.
845 * As a side effect, we make sure to transform only a valid
846 * existing config file.
847 */
848 if (git_config_from_file(store_aux, config_filename)) {
849 fprintf(stderr, "invalid config file\n");
850 free(store.key);
851 if (store.value_regex != NULL) {
852 regfree(store.value_regex);
853 free(store.value_regex);
854 }
855 ret = 3;
856 goto out_free;
857 }
858 free(store.key);
860 if (store.value_regex != NULL) {
861 regfree(store.value_regex);
862 free(store.value_regex);
863 }
864 /* if nothing to unset, or too many matches, error out */
866 if ((store.seen == 0 && value == NULL) ||
867 (store.seen > 1 && multi_replace == 0)) {
868 ret = 5;
869 goto out_free;
870 }
871 fstat(in_fd, &st);
873 contents_sz = xsize_t(st.st_size);
874 contents = xmmap(NULL, contents_sz, PROT_READ,
875 MAP_PRIVATE, in_fd, 0);
876 close(in_fd);
877 if (store.seen == 0)
879 store.seen = 1;
880 for (i = 0, copy_begin = 0; i < store.seen; i++) {
882 if (store.offset[i] == 0) {
883 store.offset[i] = copy_end = contents_sz;
884 } else if (store.state != KEY_SEEN) {
885 copy_end = store.offset[i];
886 } else
887 copy_end = find_beginning_of_line(
888 contents, contents_sz,
889 store.offset[i]-2, &new_line);
890 /* write the first part of the config */
892 if (copy_end > copy_begin) {
893 if (write_in_full(fd, contents + copy_begin,
894 copy_end - copy_begin) <
895 copy_end - copy_begin)
896 goto write_err_out;
897 if (new_line &&
898 write_in_full(fd, "\n", 1) != 1)
899 goto write_err_out;
900 }
901 copy_begin = store.offset[i];
902 }
903 /* write the pair (value == NULL means unset) */
905 if (value != NULL) {
906 if (store.state == START) {
907 if (!store_write_section(fd, key))
908 goto write_err_out;
909 }
910 if (!store_write_pair(fd, key, value))
911 goto write_err_out;
912 }
913 /* write the rest of the config */
915 if (copy_begin < contents_sz)
916 if (write_in_full(fd, contents + copy_begin,
917 contents_sz - copy_begin) <
918 contents_sz - copy_begin)
919 goto write_err_out;
920 munmap(contents, contents_sz);
922 }
923 if (close(fd) || commit_lock_file(lock) < 0) {
925 fprintf(stderr, "Cannot commit config file!\n");
926 ret = 4;
927 goto out_free;
928 }
929 /* fd is closed, so don't try to close it below. */
931 fd = -1;
932 /*
933 * lock is committed, so don't try to roll it back below.
934 * NOTE: Since lockfile.c keeps a linked list of all created
935 * lock_file structures, it isn't safe to free(lock). It's
936 * better to just leave it hanging around.
937 */
938 lock = NULL;
939 ret = 0;
940out_free:
942 if (0 <= fd)
943 close(fd);
944 if (lock)
945 rollback_lock_file(lock);
946 free(config_filename);
947 return ret;
948write_err_out:
950 ret = write_error();
951 goto out_free;
952}
954static int section_name_match (const char *buf, const char *name)
956{
957 int i = 0, j = 0, dot = 0;
958 for (; buf[i] && buf[i] != ']'; i++) {
959 if (!dot && isspace(buf[i])) {
960 dot = 1;
961 if (name[j++] != '.')
962 break;
963 for (i++; isspace(buf[i]); i++)
964 ; /* do nothing */
965 if (buf[i] != '"')
966 break;
967 continue;
968 }
969 if (buf[i] == '\\' && dot)
970 i++;
971 else if (buf[i] == '"' && dot) {
972 for (i++; isspace(buf[i]); i++)
973 ; /* do_nothing */
974 break;
975 }
976 if (buf[i] != name[j++])
977 break;
978 }
979 return (buf[i] == ']' && name[j] == 0);
980}
981/* if new_name == NULL, the section is removed instead */
983int git_config_rename_section(const char *old_name, const char *new_name)
984{
985 int ret = 0, remove = 0;
986 char *config_filename;
987 struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
988 int out_fd;
989 char buf[1024];
990 config_filename = getenv(CONFIG_ENVIRONMENT);
992 if (!config_filename) {
993 config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
994 if (!config_filename)
995 config_filename = git_path("config");
996 }
997 config_filename = xstrdup(config_filename);
998 out_fd = hold_lock_file_for_update(lock, config_filename, 0);
999 if (out_fd < 0) {
1000 ret = error("Could not lock config file!");
1001 goto out;
1002 }
1003 if (!(config_file = fopen(config_filename, "rb"))) {
1005 /* no config file means nothing to rename, no error */
1006 goto unlock_and_out;
1007 }
1008 while (fgets(buf, sizeof(buf), config_file)) {
1010 int i;
1011 int length;
1012 for (i = 0; buf[i] && isspace(buf[i]); i++)
1013 ; /* do nothing */
1014 if (buf[i] == '[') {
1015 /* it's a section */
1016 if (section_name_match (&buf[i+1], old_name)) {
1017 ret++;
1018 if (new_name == NULL) {
1019 remove = 1;
1020 continue;
1021 }
1022 store.baselen = strlen(new_name);
1023 if (!store_write_section(out_fd, new_name)) {
1024 ret = write_error();
1025 goto out;
1026 }
1027 continue;
1028 }
1029 remove = 0;
1030 }
1031 if (remove)
1032 continue;
1033 length = strlen(buf);
1034 if (write_in_full(out_fd, buf, length) != length) {
1035 ret = write_error();
1036 goto out;
1037 }
1038 }
1039 fclose(config_file);
1040 unlock_and_out:
1041 if (close(out_fd) || commit_lock_file(lock) < 0)
1042 ret = error("Cannot commit config file!");
1043 out:
1044 free(config_filename);
1045 return ret;
1046}