utf8: pick_one_utf8_char()
[git/mingw.git] / config.c
blob857deb6c85091057f663d2eb7143f3717bd82687
1 /*
2 * GIT - The information manager from hell
4 * Copyright (C) Linus Torvalds, 2005
5 * Copyright (C) Johannes Schindelin, 2005
7 */
8 #include "cache.h"
9 #include "exec_cmd.h"
11 #define MAXNAME (256)
13 static FILE *config_file;
14 static const char *config_file_name;
15 static int config_linenr;
16 static int config_file_eof;
17 static int zlib_compression_seen;
19 static int get_next_char(void)
21 int c;
22 FILE *f;
24 c = '\n';
25 if ((f = config_file) != NULL) {
26 c = fgetc(f);
27 if (c == '\r') {
28 /* DOS like systems */
29 c = fgetc(f);
30 if (c != '\n') {
31 ungetc(c, f);
32 c = '\r';
35 if (c == '\n')
36 config_linenr++;
37 if (c == EOF) {
38 config_file_eof = 1;
39 c = '\n';
42 return c;
45 static char *parse_value(void)
47 static char value[1024];
48 int quote = 0, comment = 0, len = 0, space = 0;
50 for (;;) {
51 int c = get_next_char();
52 if (len >= sizeof(value))
53 return NULL;
54 if (c == '\n') {
55 if (quote)
56 return NULL;
57 value[len] = 0;
58 return value;
60 if (comment)
61 continue;
62 if (isspace(c) && !quote) {
63 space = 1;
64 continue;
66 if (!quote) {
67 if (c == ';' || c == '#') {
68 comment = 1;
69 continue;
72 if (space) {
73 if (len)
74 value[len++] = ' ';
75 space = 0;
77 if (c == '\\') {
78 c = get_next_char();
79 switch (c) {
80 case '\n':
81 continue;
82 case 't':
83 c = '\t';
84 break;
85 case 'b':
86 c = '\b';
87 break;
88 case 'n':
89 c = '\n';
90 break;
91 /* Some characters escape as themselves */
92 case '\\': case '"':
93 break;
94 /* Reject unknown escape sequences */
95 default:
96 return NULL;
98 value[len++] = c;
99 continue;
101 if (c == '"') {
102 quote = 1-quote;
103 continue;
105 value[len++] = c;
109 static inline int iskeychar(int c)
111 return isalnum(c) || c == '-';
114 static int get_value(config_fn_t fn, char *name, unsigned int len)
116 int c;
117 char *value;
119 /* Get the full name */
120 for (;;) {
121 c = get_next_char();
122 if (config_file_eof)
123 break;
124 if (!iskeychar(c))
125 break;
126 name[len++] = tolower(c);
127 if (len >= MAXNAME)
128 return -1;
130 name[len] = 0;
131 while (c == ' ' || c == '\t')
132 c = get_next_char();
134 value = NULL;
135 if (c != '\n') {
136 if (c != '=')
137 return -1;
138 value = parse_value();
139 if (!value)
140 return -1;
142 return fn(name, value);
145 static int get_extended_base_var(char *name, int baselen, int c)
147 do {
148 if (c == '\n')
149 return -1;
150 c = get_next_char();
151 } while (isspace(c));
153 /* We require the format to be '[base "extension"]' */
154 if (c != '"')
155 return -1;
156 name[baselen++] = '.';
158 for (;;) {
159 int c = get_next_char();
160 if (c == '\n')
161 return -1;
162 if (c == '"')
163 break;
164 if (c == '\\') {
165 c = get_next_char();
166 if (c == '\n')
167 return -1;
169 name[baselen++] = c;
170 if (baselen > MAXNAME / 2)
171 return -1;
174 /* Final ']' */
175 if (get_next_char() != ']')
176 return -1;
177 return baselen;
180 static int get_base_var(char *name)
182 int baselen = 0;
184 for (;;) {
185 int c = get_next_char();
186 if (config_file_eof)
187 return -1;
188 if (c == ']')
189 return baselen;
190 if (isspace(c))
191 return get_extended_base_var(name, baselen, c);
192 if (!iskeychar(c) && c != '.')
193 return -1;
194 if (baselen > MAXNAME / 2)
195 return -1;
196 name[baselen++] = tolower(c);
200 static int git_parse_file(config_fn_t fn)
202 int comment = 0;
203 int baselen = 0;
204 static char var[MAXNAME];
206 for (;;) {
207 int c = get_next_char();
208 if (c == '\n') {
209 if (config_file_eof)
210 return 0;
211 comment = 0;
212 continue;
214 if (comment || isspace(c))
215 continue;
216 if (c == '#' || c == ';') {
217 comment = 1;
218 continue;
220 if (c == '[') {
221 baselen = get_base_var(var);
222 if (baselen <= 0)
223 break;
224 var[baselen++] = '.';
225 var[baselen] = 0;
226 continue;
228 if (!isalpha(c))
229 break;
230 var[baselen] = tolower(c);
231 if (get_value(fn, var, baselen+1) < 0)
232 break;
234 die("bad config file line %d in %s", config_linenr, config_file_name);
237 static int parse_unit_factor(const char *end, unsigned long *val)
239 if (!*end)
240 return 1;
241 else if (!strcasecmp(end, "k")) {
242 *val *= 1024;
243 return 1;
245 else if (!strcasecmp(end, "m")) {
246 *val *= 1024 * 1024;
247 return 1;
249 else if (!strcasecmp(end, "g")) {
250 *val *= 1024 * 1024 * 1024;
251 return 1;
253 return 0;
256 int git_parse_long(const char *value, long *ret)
258 if (value && *value) {
259 char *end;
260 long val = strtol(value, &end, 0);
261 unsigned long factor = 1;
262 if (!parse_unit_factor(end, &factor))
263 return 0;
264 *ret = val * factor;
265 return 1;
267 return 0;
270 int git_parse_ulong(const char *value, unsigned long *ret)
272 if (value && *value) {
273 char *end;
274 unsigned long val = strtoul(value, &end, 0);
275 if (!parse_unit_factor(end, &val))
276 return 0;
277 *ret = val;
278 return 1;
280 return 0;
283 int git_config_int(const char *name, const char *value)
285 long ret;
286 if (!git_parse_long(value, &ret))
287 die("bad config value for '%s' in %s", name, config_file_name);
288 return ret;
291 unsigned long git_config_ulong(const char *name, const char *value)
293 unsigned long ret;
294 if (!git_parse_ulong(value, &ret))
295 die("bad config value for '%s' in %s", name, config_file_name);
296 return ret;
299 int git_config_bool(const char *name, const char *value)
301 if (!value)
302 return 1;
303 if (!*value)
304 return 0;
305 if (!strcasecmp(value, "true") || !strcasecmp(value, "yes"))
306 return 1;
307 if (!strcasecmp(value, "false") || !strcasecmp(value, "no"))
308 return 0;
309 return git_config_int(name, value) != 0;
312 int git_default_config(const char *var, const char *value)
314 /* This needs a better name */
315 if (!strcmp(var, "core.filemode")) {
316 trust_executable_bit = git_config_bool(var, value);
317 return 0;
320 if (!strcmp(var, "core.quotepath")) {
321 quote_path_fully = git_config_bool(var, value);
322 return 0;
325 if (!strcmp(var, "core.symlinks")) {
326 has_symlinks = git_config_bool(var, value);
327 return 0;
330 if (!strcmp(var, "core.bare")) {
331 is_bare_repository_cfg = git_config_bool(var, value);
332 return 0;
335 if (!strcmp(var, "core.ignorestat")) {
336 assume_unchanged = git_config_bool(var, value);
337 return 0;
340 if (!strcmp(var, "core.prefersymlinkrefs")) {
341 prefer_symlink_refs = git_config_bool(var, value);
342 return 0;
345 if (!strcmp(var, "core.logallrefupdates")) {
346 log_all_ref_updates = git_config_bool(var, value);
347 return 0;
350 if (!strcmp(var, "core.warnambiguousrefs")) {
351 warn_ambiguous_refs = git_config_bool(var, value);
352 return 0;
355 if (!strcmp(var, "core.loosecompression")) {
356 int level = git_config_int(var, value);
357 if (level == -1)
358 level = Z_DEFAULT_COMPRESSION;
359 else if (level < 0 || level > Z_BEST_COMPRESSION)
360 die("bad zlib compression level %d", level);
361 zlib_compression_level = level;
362 zlib_compression_seen = 1;
363 return 0;
366 if (!strcmp(var, "core.compression")) {
367 int level = git_config_int(var, value);
368 if (level == -1)
369 level = Z_DEFAULT_COMPRESSION;
370 else if (level < 0 || level > Z_BEST_COMPRESSION)
371 die("bad zlib compression level %d", level);
372 core_compression_level = level;
373 core_compression_seen = 1;
374 if (!zlib_compression_seen)
375 zlib_compression_level = level;
376 return 0;
379 if (!strcmp(var, "core.packedgitwindowsize")) {
380 int pgsz_x2 = getpagesize() * 2;
381 packed_git_window_size = git_config_int(var, value);
383 /* This value must be multiple of (pagesize * 2) */
384 packed_git_window_size /= pgsz_x2;
385 if (packed_git_window_size < 1)
386 packed_git_window_size = 1;
387 packed_git_window_size *= pgsz_x2;
388 return 0;
391 if (!strcmp(var, "core.packedgitlimit")) {
392 packed_git_limit = git_config_int(var, value);
393 return 0;
396 if (!strcmp(var, "core.deltabasecachelimit")) {
397 delta_base_cache_limit = git_config_int(var, value);
398 return 0;
401 if (!strcmp(var, "core.autocrlf")) {
402 if (value && !strcasecmp(value, "input")) {
403 auto_crlf = -1;
404 return 0;
406 auto_crlf = git_config_bool(var, value);
407 return 0;
410 if (!strcmp(var, "user.name")) {
411 strlcpy(git_default_name, value, sizeof(git_default_name));
412 return 0;
415 if (!strcmp(var, "user.email")) {
416 strlcpy(git_default_email, value, sizeof(git_default_email));
417 return 0;
420 if (!strcmp(var, "i18n.commitencoding")) {
421 git_commit_encoding = xstrdup(value);
422 return 0;
425 if (!strcmp(var, "i18n.logoutputencoding")) {
426 git_log_output_encoding = xstrdup(value);
427 return 0;
431 if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
432 pager_use_color = git_config_bool(var,value);
433 return 0;
436 if (!strcmp(var, "core.pager")) {
437 pager_program = xstrdup(value);
438 return 0;
441 if (!strcmp(var, "core.editor")) {
442 editor_program = xstrdup(value);
443 return 0;
446 if (!strcmp(var, "core.excludesfile")) {
447 if (!value)
448 die("core.excludesfile without value");
449 excludes_file = xstrdup(value);
450 return 0;
453 if (!strcmp(var, "core.whitespace")) {
454 whitespace_rule_cfg = parse_whitespace_rule(value);
455 return 0;
458 /* Add other config variables here and to Documentation/config.txt. */
459 return 0;
462 int git_config_from_file(config_fn_t fn, const char *filename)
464 int ret;
465 FILE *f = fopen(filename, "r");
467 ret = -1;
468 if (f) {
469 config_file = f;
470 config_file_name = filename;
471 config_linenr = 1;
472 config_file_eof = 0;
473 ret = git_parse_file(fn);
474 fclose(f);
475 config_file_name = NULL;
477 return ret;
480 const char *git_etc_gitconfig(void)
482 static const char *system_wide;
483 if (!system_wide) {
484 system_wide = ETC_GITCONFIG;
485 if (!is_absolute_path(system_wide)) {
486 /* interpret path relative to exec-dir */
487 const char *exec_path = git_exec_path();
488 system_wide = prefix_path(exec_path, strlen(exec_path),
489 system_wide);
492 return system_wide;
495 int git_config(config_fn_t fn)
497 int ret = 0;
498 char *repo_config = NULL;
499 const char *home = NULL, *filename;
501 /* $GIT_CONFIG makes git read _only_ the given config file,
502 * $GIT_CONFIG_LOCAL will make it process it in addition to the
503 * global config file, the same way it would the per-repository
504 * config file otherwise. */
505 filename = getenv(CONFIG_ENVIRONMENT);
506 if (!filename) {
507 if (!access(git_etc_gitconfig(), R_OK))
508 ret += git_config_from_file(fn, git_etc_gitconfig());
509 home = getenv("HOME");
510 filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
511 if (!filename)
512 filename = repo_config = xstrdup(git_path("config"));
515 if (home) {
516 char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
517 if (!access(user_config, R_OK))
518 ret = git_config_from_file(fn, user_config);
519 free(user_config);
522 ret += git_config_from_file(fn, filename);
523 free(repo_config);
524 return ret;
528 * Find all the stuff for git_config_set() below.
531 #define MAX_MATCHES 512
533 static struct {
534 int baselen;
535 char* key;
536 int do_not_match;
537 regex_t* value_regex;
538 int multi_replace;
539 size_t offset[MAX_MATCHES];
540 enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
541 int seen;
542 } store;
544 static int matches(const char* key, const char* value)
546 return !strcmp(key, store.key) &&
547 (store.value_regex == NULL ||
548 (store.do_not_match ^
549 !regexec(store.value_regex, value, 0, NULL, 0)));
552 static int store_aux(const char* key, const char* value)
554 const char *ep;
555 size_t section_len;
557 switch (store.state) {
558 case KEY_SEEN:
559 if (matches(key, value)) {
560 if (store.seen == 1 && store.multi_replace == 0) {
561 fprintf(stderr,
562 "Warning: %s has multiple values\n",
563 key);
564 } else if (store.seen >= MAX_MATCHES) {
565 fprintf(stderr, "Too many matches\n");
566 return 1;
569 store.offset[store.seen] = ftell(config_file);
570 store.seen++;
572 break;
573 case SECTION_SEEN:
575 * What we are looking for is in store.key (both
576 * section and var), and its section part is baselen
577 * long. We found key (again, both section and var).
578 * We would want to know if this key is in the same
579 * section as what we are looking for. We already
580 * know we are in the same section as what should
581 * hold store.key.
583 ep = strrchr(key, '.');
584 section_len = ep - key;
586 if ((section_len != store.baselen) ||
587 memcmp(key, store.key, section_len+1)) {
588 store.state = SECTION_END_SEEN;
589 break;
593 * Do not increment matches: this is no match, but we
594 * just made sure we are in the desired section.
596 store.offset[store.seen] = ftell(config_file);
597 /* fallthru */
598 case SECTION_END_SEEN:
599 case START:
600 if (matches(key, value)) {
601 store.offset[store.seen] = ftell(config_file);
602 store.state = KEY_SEEN;
603 store.seen++;
604 } else {
605 if (strrchr(key, '.') - key == store.baselen &&
606 !strncmp(key, store.key, store.baselen)) {
607 store.state = SECTION_SEEN;
608 store.offset[store.seen] = ftell(config_file);
612 return 0;
615 static int write_error(void)
617 fprintf(stderr, "Failed to write new configuration file\n");
619 /* Same error code as "failed to rename". */
620 return 4;
623 static int store_write_section(int fd, const char* key)
625 const char *dot;
626 int i, success;
627 struct strbuf sb;
629 strbuf_init(&sb, 0);
630 dot = memchr(key, '.', store.baselen);
631 if (dot) {
632 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
633 for (i = dot - key + 1; i < store.baselen; i++) {
634 if (key[i] == '"')
635 strbuf_addch(&sb, '\\');
636 strbuf_addch(&sb, key[i]);
638 strbuf_addstr(&sb, "\"]\n");
639 } else {
640 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
643 success = write_in_full(fd, sb.buf, sb.len) == sb.len;
644 strbuf_release(&sb);
646 return success;
649 static int store_write_pair(int fd, const char* key, const char* value)
651 int i, success;
652 int length = strlen(key + store.baselen + 1);
653 const char *quote = "";
654 struct strbuf sb;
657 * Check to see if the value needs to be surrounded with a dq pair.
658 * Note that problematic characters are always backslash-quoted; this
659 * check is about not losing leading or trailing SP and strings that
660 * follow beginning-of-comment characters (i.e. ';' and '#') by the
661 * configuration parser.
663 if (value[0] == ' ')
664 quote = "\"";
665 for (i = 0; value[i]; i++)
666 if (value[i] == ';' || value[i] == '#')
667 quote = "\"";
668 if (i && value[i - 1] == ' ')
669 quote = "\"";
671 strbuf_init(&sb, 0);
672 strbuf_addf(&sb, "\t%.*s = %s",
673 length, key + store.baselen + 1, quote);
675 for (i = 0; value[i]; i++)
676 switch (value[i]) {
677 case '\n':
678 strbuf_addstr(&sb, "\\n");
679 break;
680 case '\t':
681 strbuf_addstr(&sb, "\\t");
682 break;
683 case '"':
684 case '\\':
685 strbuf_addch(&sb, '\\');
686 default:
687 strbuf_addch(&sb, value[i]);
688 break;
690 strbuf_addf(&sb, "%s\n", quote);
692 success = write_in_full(fd, sb.buf, sb.len) == sb.len;
693 strbuf_release(&sb);
695 return success;
698 static ssize_t find_beginning_of_line(const char* contents, size_t size,
699 size_t offset_, int* found_bracket)
701 size_t equal_offset = size, bracket_offset = size;
702 ssize_t offset;
704 for (offset = offset_-2; offset > 0
705 && contents[offset] != '\n'; offset--)
706 switch (contents[offset]) {
707 case '=': equal_offset = offset; break;
708 case ']': bracket_offset = offset; break;
710 if (bracket_offset < equal_offset) {
711 *found_bracket = 1;
712 offset = bracket_offset+1;
713 } else
714 offset++;
716 return offset;
719 int git_config_set(const char* key, const char* value)
721 return git_config_set_multivar(key, value, NULL, 0);
725 * If value==NULL, unset in (remove from) config,
726 * if value_regex!=NULL, disregard key/value pairs where value does not match.
727 * if multi_replace==0, nothing, or only one matching key/value is replaced,
728 * else all matching key/values (regardless how many) are removed,
729 * before the new pair is written.
731 * Returns 0 on success.
733 * This function does this:
735 * - it locks the config file by creating ".git/config.lock"
737 * - it then parses the config using store_aux() as validator to find
738 * the position on the key/value pair to replace. If it is to be unset,
739 * it must be found exactly once.
741 * - the config file is mmap()ed and the part before the match (if any) is
742 * written to the lock file, then the changed part and the rest.
744 * - the config file is removed and the lock file rename()d to it.
747 int git_config_set_multivar(const char* key, const char* value,
748 const char* value_regex, int multi_replace)
750 int i, dot;
751 int fd = -1, in_fd;
752 int ret;
753 char* config_filename;
754 struct lock_file *lock = NULL;
755 const char* last_dot = strrchr(key, '.');
757 config_filename = getenv(CONFIG_ENVIRONMENT);
758 if (!config_filename) {
759 config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
760 if (!config_filename)
761 config_filename = git_path("config");
763 config_filename = xstrdup(config_filename);
766 * Since "key" actually contains the section name and the real
767 * key name separated by a dot, we have to know where the dot is.
770 if (last_dot == NULL) {
771 fprintf(stderr, "key does not contain a section: %s\n", key);
772 ret = 2;
773 goto out_free;
775 store.baselen = last_dot - key;
777 store.multi_replace = multi_replace;
780 * Validate the key and while at it, lower case it for matching.
782 store.key = xmalloc(strlen(key) + 1);
783 dot = 0;
784 for (i = 0; key[i]; i++) {
785 unsigned char c = key[i];
786 if (c == '.')
787 dot = 1;
788 /* Leave the extended basename untouched.. */
789 if (!dot || i > store.baselen) {
790 if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
791 fprintf(stderr, "invalid key: %s\n", key);
792 free(store.key);
793 ret = 1;
794 goto out_free;
796 c = tolower(c);
797 } else if (c == '\n') {
798 fprintf(stderr, "invalid key (newline): %s\n", key);
799 free(store.key);
800 ret = 1;
801 goto out_free;
803 store.key[i] = c;
805 store.key[i] = 0;
808 * The lock serves a purpose in addition to locking: the new
809 * contents of .git/config will be written into it.
811 lock = xcalloc(sizeof(struct lock_file), 1);
812 fd = hold_lock_file_for_update(lock, config_filename, 0);
813 if (fd < 0) {
814 fprintf(stderr, "could not lock config file\n");
815 free(store.key);
816 ret = -1;
817 goto out_free;
821 * If .git/config does not exist yet, write a minimal version.
823 in_fd = open(config_filename, O_RDONLY);
824 if ( in_fd < 0 ) {
825 free(store.key);
827 if ( ENOENT != errno ) {
828 error("opening %s: %s", config_filename,
829 strerror(errno));
830 ret = 3; /* same as "invalid config file" */
831 goto out_free;
833 /* if nothing to unset, error out */
834 if (value == NULL) {
835 ret = 5;
836 goto out_free;
839 store.key = (char*)key;
840 if (!store_write_section(fd, key) ||
841 !store_write_pair(fd, key, value))
842 goto write_err_out;
843 } else {
844 struct stat st;
845 char* contents;
846 size_t contents_sz, copy_begin, copy_end;
847 int i, new_line = 0;
849 if (value_regex == NULL)
850 store.value_regex = NULL;
851 else {
852 if (value_regex[0] == '!') {
853 store.do_not_match = 1;
854 value_regex++;
855 } else
856 store.do_not_match = 0;
858 store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
859 if (regcomp(store.value_regex, value_regex,
860 REG_EXTENDED)) {
861 fprintf(stderr, "Invalid pattern: %s\n",
862 value_regex);
863 free(store.value_regex);
864 ret = 6;
865 goto out_free;
869 store.offset[0] = 0;
870 store.state = START;
871 store.seen = 0;
874 * After this, store.offset will contain the *end* offset
875 * of the last match, or remain at 0 if no match was found.
876 * As a side effect, we make sure to transform only a valid
877 * existing config file.
879 if (git_config_from_file(store_aux, config_filename)) {
880 fprintf(stderr, "invalid config file\n");
881 free(store.key);
882 if (store.value_regex != NULL) {
883 regfree(store.value_regex);
884 free(store.value_regex);
886 ret = 3;
887 goto out_free;
890 free(store.key);
891 if (store.value_regex != NULL) {
892 regfree(store.value_regex);
893 free(store.value_regex);
896 /* if nothing to unset, or too many matches, error out */
897 if ((store.seen == 0 && value == NULL) ||
898 (store.seen > 1 && multi_replace == 0)) {
899 ret = 5;
900 goto out_free;
903 fstat(in_fd, &st);
904 contents_sz = xsize_t(st.st_size);
905 contents = xmmap(NULL, contents_sz, PROT_READ,
906 MAP_PRIVATE, in_fd, 0);
907 close(in_fd);
909 if (store.seen == 0)
910 store.seen = 1;
912 for (i = 0, copy_begin = 0; i < store.seen; i++) {
913 if (store.offset[i] == 0) {
914 store.offset[i] = copy_end = contents_sz;
915 } else if (store.state != KEY_SEEN) {
916 copy_end = store.offset[i];
917 } else
918 copy_end = find_beginning_of_line(
919 contents, contents_sz,
920 store.offset[i]-2, &new_line);
922 if (copy_end > 0 && contents[copy_end-1] != '\n')
923 new_line = 1;
925 /* write the first part of the config */
926 if (copy_end > copy_begin) {
927 if (write_in_full(fd, contents + copy_begin,
928 copy_end - copy_begin) <
929 copy_end - copy_begin)
930 goto write_err_out;
931 if (new_line &&
932 write_in_full(fd, "\n", 1) != 1)
933 goto write_err_out;
935 copy_begin = store.offset[i];
938 /* write the pair (value == NULL means unset) */
939 if (value != NULL) {
940 if (store.state == START) {
941 if (!store_write_section(fd, key))
942 goto write_err_out;
944 if (!store_write_pair(fd, key, value))
945 goto write_err_out;
948 /* write the rest of the config */
949 if (copy_begin < contents_sz)
950 if (write_in_full(fd, contents + copy_begin,
951 contents_sz - copy_begin) <
952 contents_sz - copy_begin)
953 goto write_err_out;
955 munmap(contents, contents_sz);
958 if (close(fd) || commit_lock_file(lock) < 0) {
959 fprintf(stderr, "Cannot commit config file!\n");
960 ret = 4;
961 goto out_free;
964 /* fd is closed, so don't try to close it below. */
965 fd = -1;
967 * lock is committed, so don't try to roll it back below.
968 * NOTE: Since lockfile.c keeps a linked list of all created
969 * lock_file structures, it isn't safe to free(lock). It's
970 * better to just leave it hanging around.
972 lock = NULL;
973 ret = 0;
975 out_free:
976 if (0 <= fd)
977 close(fd);
978 if (lock)
979 rollback_lock_file(lock);
980 free(config_filename);
981 return ret;
983 write_err_out:
984 ret = write_error();
985 goto out_free;
989 static int section_name_match (const char *buf, const char *name)
991 int i = 0, j = 0, dot = 0;
992 for (; buf[i] && buf[i] != ']'; i++) {
993 if (!dot && isspace(buf[i])) {
994 dot = 1;
995 if (name[j++] != '.')
996 break;
997 for (i++; isspace(buf[i]); i++)
998 ; /* do nothing */
999 if (buf[i] != '"')
1000 break;
1001 continue;
1003 if (buf[i] == '\\' && dot)
1004 i++;
1005 else if (buf[i] == '"' && dot) {
1006 for (i++; isspace(buf[i]); i++)
1007 ; /* do_nothing */
1008 break;
1010 if (buf[i] != name[j++])
1011 break;
1013 return (buf[i] == ']' && name[j] == 0);
1016 /* if new_name == NULL, the section is removed instead */
1017 int git_config_rename_section(const char *old_name, const char *new_name)
1019 int ret = 0, remove = 0;
1020 char *config_filename;
1021 struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1022 int out_fd;
1023 char buf[1024];
1025 config_filename = getenv(CONFIG_ENVIRONMENT);
1026 if (!config_filename) {
1027 config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
1028 if (!config_filename)
1029 config_filename = git_path("config");
1031 config_filename = xstrdup(config_filename);
1032 out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1033 if (out_fd < 0) {
1034 ret = error("Could not lock config file!");
1035 goto out;
1038 if (!(config_file = fopen(config_filename, "rb"))) {
1039 /* no config file means nothing to rename, no error */
1040 goto unlock_and_out;
1043 while (fgets(buf, sizeof(buf), config_file)) {
1044 int i;
1045 int length;
1046 for (i = 0; buf[i] && isspace(buf[i]); i++)
1047 ; /* do nothing */
1048 if (buf[i] == '[') {
1049 /* it's a section */
1050 if (section_name_match (&buf[i+1], old_name)) {
1051 ret++;
1052 if (new_name == NULL) {
1053 remove = 1;
1054 continue;
1056 store.baselen = strlen(new_name);
1057 if (!store_write_section(out_fd, new_name)) {
1058 ret = write_error();
1059 goto out;
1061 continue;
1063 remove = 0;
1065 if (remove)
1066 continue;
1067 length = strlen(buf);
1068 if (write_in_full(out_fd, buf, length) != length) {
1069 ret = write_error();
1070 goto out;
1073 fclose(config_file);
1074 unlock_and_out:
1075 if (close(out_fd) || commit_lock_file(lock) < 0)
1076 ret = error("Cannot commit config file!");
1077 out:
1078 free(config_filename);
1079 return ret;