Initial bulk commit for "Git on MSys"
[msysgit/historical-msysgit.git] / git / config.c
blob9a665905abe31d1495e1cc339fc59e95c777dab4
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 zlib_compression_seen;
18 static int get_next_char(void)
20 int c;
21 FILE *f;
23 c = '\n';
24 if ((f = config_file) != NULL) {
25 c = fgetc(f);
26 if (c == '\r') {
27 /* DOS like systems */
28 c = fgetc(f);
29 if (c != '\n') {
30 ungetc(c, f);
31 c = '\r';
34 if (c == '\n')
35 config_linenr++;
36 if (c == EOF) {
37 config_file = NULL;
38 c = '\n';
41 return c;
44 static char *parse_value(void)
46 static char value[1024];
47 int quote = 0, comment = 0, len = 0, space = 0;
49 for (;;) {
50 int c = get_next_char();
51 if (len >= sizeof(value))
52 return NULL;
53 if (c == '\n') {
54 if (quote)
55 return NULL;
56 value[len] = 0;
57 return value;
59 if (comment)
60 continue;
61 if (isspace(c) && !quote) {
62 space = 1;
63 continue;
65 if (!quote) {
66 if (c == ';' || c == '#') {
67 comment = 1;
68 continue;
71 if (space) {
72 if (len)
73 value[len++] = ' ';
74 space = 0;
76 if (c == '\\') {
77 c = get_next_char();
78 switch (c) {
79 case '\n':
80 continue;
81 case 't':
82 c = '\t';
83 break;
84 case 'b':
85 c = '\b';
86 break;
87 case 'n':
88 c = '\n';
89 break;
90 /* Some characters escape as themselves */
91 case '\\': case '"':
92 break;
93 /* Reject unknown escape sequences */
94 default:
95 return NULL;
97 value[len++] = c;
98 continue;
100 if (c == '"') {
101 quote = 1-quote;
102 continue;
104 value[len++] = c;
108 static inline int iskeychar(int c)
110 return isalnum(c) || c == '-';
113 static int get_value(config_fn_t fn, char *name, unsigned int len)
115 int c;
116 char *value;
118 /* Get the full name */
119 for (;;) {
120 c = get_next_char();
121 if (c == EOF)
122 break;
123 if (!iskeychar(c))
124 break;
125 name[len++] = tolower(c);
126 if (len >= MAXNAME)
127 return -1;
129 name[len] = 0;
130 while (c == ' ' || c == '\t')
131 c = get_next_char();
133 value = NULL;
134 if (c != '\n') {
135 if (c != '=')
136 return -1;
137 value = parse_value();
138 if (!value)
139 return -1;
141 return fn(name, value);
144 static int get_extended_base_var(char *name, int baselen, int c)
146 do {
147 if (c == '\n')
148 return -1;
149 c = get_next_char();
150 } while (isspace(c));
152 /* We require the format to be '[base "extension"]' */
153 if (c != '"')
154 return -1;
155 name[baselen++] = '.';
157 for (;;) {
158 int c = get_next_char();
159 if (c == '\n')
160 return -1;
161 if (c == '"')
162 break;
163 if (c == '\\') {
164 c = get_next_char();
165 if (c == '\n')
166 return -1;
168 name[baselen++] = c;
169 if (baselen > MAXNAME / 2)
170 return -1;
173 /* Final ']' */
174 if (get_next_char() != ']')
175 return -1;
176 return baselen;
179 static int get_base_var(char *name)
181 int baselen = 0;
183 for (;;) {
184 int c = get_next_char();
185 if (c == EOF)
186 return -1;
187 if (c == ']')
188 return baselen;
189 if (isspace(c))
190 return get_extended_base_var(name, baselen, c);
191 if (!iskeychar(c) && c != '.')
192 return -1;
193 if (baselen > MAXNAME / 2)
194 return -1;
195 name[baselen++] = tolower(c);
199 static int git_parse_file(config_fn_t fn)
201 int comment = 0;
202 int baselen = 0;
203 static char var[MAXNAME];
205 for (;;) {
206 int c = get_next_char();
207 if (c == '\n') {
208 /* EOF? */
209 if (!config_file)
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 unsigned long get_unit_factor(const char *end)
239 if (!*end)
240 return 1;
241 else if (!strcasecmp(end, "k"))
242 return 1024;
243 else if (!strcasecmp(end, "m"))
244 return 1024 * 1024;
245 else if (!strcasecmp(end, "g"))
246 return 1024 * 1024 * 1024;
247 die("unknown unit: '%s'", end);
250 int git_parse_long(const char *value, long *ret)
252 if (value && *value) {
253 char *end;
254 long val = strtol(value, &end, 0);
255 *ret = val * get_unit_factor(end);
256 return 1;
258 return 0;
261 int git_parse_ulong(const char *value, unsigned long *ret)
263 if (value && *value) {
264 char *end;
265 unsigned long val = strtoul(value, &end, 0);
266 *ret = val * get_unit_factor(end);
267 return 1;
269 return 0;
272 int git_config_int(const char *name, const char *value)
274 long ret;
275 if (!git_parse_long(value, &ret))
276 die("bad config value for '%s' in %s", name, config_file_name);
277 return ret;
280 unsigned long git_config_ulong(const char *name, const char *value)
282 unsigned long ret;
283 if (!git_parse_ulong(value, &ret))
284 die("bad config value for '%s' in %s", name, config_file_name);
285 return ret;
288 int git_config_bool(const char *name, const char *value)
290 if (!value)
291 return 1;
292 if (!*value)
293 return 0;
294 if (!strcasecmp(value, "true") || !strcasecmp(value, "yes"))
295 return 1;
296 if (!strcasecmp(value, "false") || !strcasecmp(value, "no"))
297 return 0;
298 return git_config_int(name, value) != 0;
301 int git_default_config(const char *var, const char *value)
303 /* This needs a better name */
304 if (!strcmp(var, "core.filemode")) {
305 trust_executable_bit = git_config_bool(var, value);
306 return 0;
309 if (!strcmp(var, "core.quotepath")) {
310 quote_path_fully = git_config_bool(var, value);
311 return 0;
314 if (!strcmp(var, "core.symlinks")) {
315 has_symlinks = git_config_bool(var, value);
316 return 0;
319 if (!strcmp(var, "core.bare")) {
320 is_bare_repository_cfg = git_config_bool(var, value);
321 return 0;
324 if (!strcmp(var, "core.ignorestat")) {
325 assume_unchanged = git_config_bool(var, value);
326 return 0;
329 if (!strcmp(var, "core.prefersymlinkrefs")) {
330 prefer_symlink_refs = git_config_bool(var, value);
331 return 0;
334 if (!strcmp(var, "core.logallrefupdates")) {
335 log_all_ref_updates = git_config_bool(var, value);
336 return 0;
339 if (!strcmp(var, "core.warnambiguousrefs")) {
340 warn_ambiguous_refs = git_config_bool(var, value);
341 return 0;
344 if (!strcmp(var, "core.loosecompression")) {
345 int level = git_config_int(var, value);
346 if (level == -1)
347 level = Z_DEFAULT_COMPRESSION;
348 else if (level < 0 || level > Z_BEST_COMPRESSION)
349 die("bad zlib compression level %d", level);
350 zlib_compression_level = level;
351 zlib_compression_seen = 1;
352 return 0;
355 if (!strcmp(var, "core.compression")) {
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 core_compression_level = level;
362 core_compression_seen = 1;
363 if (!zlib_compression_seen)
364 zlib_compression_level = level;
365 return 0;
368 if (!strcmp(var, "core.packedgitwindowsize")) {
369 int pgsz_x2 = getpagesize() * 2;
370 packed_git_window_size = git_config_int(var, value);
372 /* This value must be multiple of (pagesize * 2) */
373 packed_git_window_size /= pgsz_x2;
374 if (packed_git_window_size < 1)
375 packed_git_window_size = 1;
376 packed_git_window_size *= pgsz_x2;
377 return 0;
380 if (!strcmp(var, "core.packedgitlimit")) {
381 packed_git_limit = git_config_int(var, value);
382 return 0;
385 if (!strcmp(var, "core.deltabasecachelimit")) {
386 delta_base_cache_limit = git_config_int(var, value);
387 return 0;
390 if (!strcmp(var, "core.autocrlf")) {
391 if (value && !strcasecmp(value, "input")) {
392 auto_crlf = -1;
393 return 0;
395 auto_crlf = git_config_bool(var, value);
396 return 0;
399 if (!strcmp(var, "user.name")) {
400 strlcpy(git_default_name, value, sizeof(git_default_name));
401 return 0;
404 if (!strcmp(var, "user.email")) {
405 strlcpy(git_default_email, value, sizeof(git_default_email));
406 return 0;
409 if (!strcmp(var, "i18n.commitencoding")) {
410 git_commit_encoding = xstrdup(value);
411 return 0;
414 if (!strcmp(var, "i18n.logoutputencoding")) {
415 git_log_output_encoding = xstrdup(value);
416 return 0;
420 if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
421 pager_use_color = git_config_bool(var,value);
422 return 0;
425 if (!strcmp(var, "core.pager")) {
426 pager_program = xstrdup(value);
427 return 0;
430 /* Add other config variables here and to Documentation/config.txt. */
431 return 0;
434 int git_config_from_file(config_fn_t fn, const char *filename)
436 int ret;
437 FILE *f = fopen(filename, "r");
439 ret = -1;
440 if (f) {
441 config_file = f;
442 config_file_name = filename;
443 config_linenr = 1;
444 ret = git_parse_file(fn);
445 fclose(f);
446 config_file_name = NULL;
448 return ret;
451 const char *git_etc_gitconfig(void)
453 static const char *system_wide;
454 if (!system_wide) {
455 system_wide = ETC_GITCONFIG;
456 /* interpret path relative to exec-dir */
457 if (system_wide[0] != '/' && system_wide[1] != ':') {
458 const char *exec_path = git_exec_path();
459 system_wide = prefix_path(exec_path, strlen(exec_path),
460 system_wide);
463 return system_wide;
466 int git_config(config_fn_t fn)
468 int ret = 0;
469 char *repo_config = NULL;
470 const char *home = NULL, *filename;
472 /* $GIT_CONFIG makes git read _only_ the given config file,
473 * $GIT_CONFIG_LOCAL will make it process it in addition to the
474 * global config file, the same way it would the per-repository
475 * config file otherwise. */
476 filename = getenv(CONFIG_ENVIRONMENT);
477 if (!filename) {
478 if (!access(git_etc_gitconfig(), R_OK))
479 ret += git_config_from_file(fn, git_etc_gitconfig());
480 home = getenv("HOME");
481 filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
482 if (!filename)
483 filename = repo_config = xstrdup(git_path("config"));
486 if (home) {
487 char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
488 if (!access(user_config, R_OK))
489 ret = git_config_from_file(fn, user_config);
490 free(user_config);
493 ret += git_config_from_file(fn, filename);
494 free(repo_config);
495 return ret;
499 * Find all the stuff for git_config_set() below.
502 #define MAX_MATCHES 512
504 static struct {
505 int baselen;
506 char* key;
507 int do_not_match;
508 regex_t* value_regex;
509 int multi_replace;
510 size_t offset[MAX_MATCHES];
511 enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
512 int seen;
513 } store;
515 static int matches(const char* key, const char* value)
517 return !strcmp(key, store.key) &&
518 (store.value_regex == NULL ||
519 (store.do_not_match ^
520 !regexec(store.value_regex, value, 0, NULL, 0)));
523 static int store_aux(const char* key, const char* value)
525 const char *ep;
526 size_t section_len;
528 switch (store.state) {
529 case KEY_SEEN:
530 if (matches(key, value)) {
531 if (store.seen == 1 && store.multi_replace == 0) {
532 fprintf(stderr,
533 "Warning: %s has multiple values\n",
534 key);
535 } else if (store.seen >= MAX_MATCHES) {
536 fprintf(stderr, "Too many matches\n");
537 return 1;
540 store.offset[store.seen] = ftell(config_file);
541 store.seen++;
543 break;
544 case SECTION_SEEN:
546 * What we are looking for is in store.key (both
547 * section and var), and its section part is baselen
548 * long. We found key (again, both section and var).
549 * We would want to know if this key is in the same
550 * section as what we are looking for. We already
551 * know we are in the same section as what should
552 * hold store.key.
554 ep = strrchr(key, '.');
555 section_len = ep - key;
557 if ((section_len != store.baselen) ||
558 memcmp(key, store.key, section_len+1)) {
559 store.state = SECTION_END_SEEN;
560 break;
564 * Do not increment matches: this is no match, but we
565 * just made sure we are in the desired section.
567 store.offset[store.seen] = ftell(config_file);
568 /* fallthru */
569 case SECTION_END_SEEN:
570 case START:
571 if (matches(key, value)) {
572 store.offset[store.seen] = ftell(config_file);
573 store.state = KEY_SEEN;
574 store.seen++;
575 } else {
576 if (strrchr(key, '.') - key == store.baselen &&
577 !strncmp(key, store.key, store.baselen)) {
578 store.state = SECTION_SEEN;
579 store.offset[store.seen] = ftell(config_file);
583 return 0;
586 static int write_error(void)
588 fprintf(stderr, "Failed to write new configuration file\n");
590 /* Same error code as "failed to rename". */
591 return 4;
594 static int store_write_section(int fd, const char* key)
596 const char *dot = strchr(key, '.');
597 int len1 = store.baselen, len2 = -1;
599 dot = strchr(key, '.');
600 if (dot) {
601 int dotlen = dot - key;
602 if (dotlen < len1) {
603 len2 = len1 - dotlen - 1;
604 len1 = dotlen;
608 if (write_in_full(fd, "[", 1) != 1 ||
609 write_in_full(fd, key, len1) != len1)
610 return 0;
611 if (len2 >= 0) {
612 if (write_in_full(fd, " \"", 2) != 2)
613 return 0;
614 while (--len2 >= 0) {
615 unsigned char c = *++dot;
616 if (c == '"')
617 if (write_in_full(fd, "\\", 1) != 1)
618 return 0;
619 if (write_in_full(fd, &c, 1) != 1)
620 return 0;
622 if (write_in_full(fd, "\"", 1) != 1)
623 return 0;
625 if (write_in_full(fd, "]\n", 2) != 2)
626 return 0;
628 return 1;
631 static int store_write_pair(int fd, const char* key, const char* value)
633 int i;
634 int length = strlen(key+store.baselen+1);
635 int quote = 0;
637 /* Check to see if the value needs to be quoted. */
638 if (value[0] == ' ')
639 quote = 1;
640 for (i = 0; value[i]; i++)
641 if (value[i] == ';' || value[i] == '#')
642 quote = 1;
643 if (value[i-1] == ' ')
644 quote = 1;
646 if (write_in_full(fd, "\t", 1) != 1 ||
647 write_in_full(fd, key+store.baselen+1, length) != length ||
648 write_in_full(fd, " = ", 3) != 3)
649 return 0;
650 if (quote && write_in_full(fd, "\"", 1) != 1)
651 return 0;
652 for (i = 0; value[i]; i++)
653 switch (value[i]) {
654 case '\n':
655 if (write_in_full(fd, "\\n", 2) != 2)
656 return 0;
657 break;
658 case '\t':
659 if (write_in_full(fd, "\\t", 2) != 2)
660 return 0;
661 break;
662 case '"':
663 case '\\':
664 if (write_in_full(fd, "\\", 1) != 1)
665 return 0;
666 default:
667 if (write_in_full(fd, value+i, 1) != 1)
668 return 0;
669 break;
671 if (quote && write_in_full(fd, "\"", 1) != 1)
672 return 0;
673 if (write_in_full(fd, "\n", 1) != 1)
674 return 0;
675 return 1;
678 static ssize_t find_beginning_of_line(const char* contents, size_t size,
679 size_t offset_, int* found_bracket)
681 size_t equal_offset = size, bracket_offset = size;
682 ssize_t offset;
684 for (offset = offset_-2; offset > 0
685 && contents[offset] != '\n'; offset--)
686 switch (contents[offset]) {
687 case '=': equal_offset = offset; break;
688 case ']': bracket_offset = offset; break;
690 if (bracket_offset < equal_offset) {
691 *found_bracket = 1;
692 offset = bracket_offset+1;
693 } else
694 offset++;
696 return offset;
699 int git_config_set(const char* key, const char* value)
701 return git_config_set_multivar(key, value, NULL, 0);
705 * If value==NULL, unset in (remove from) config,
706 * if value_regex!=NULL, disregard key/value pairs where value does not match.
707 * if multi_replace==0, nothing, or only one matching key/value is replaced,
708 * else all matching key/values (regardless how many) are removed,
709 * before the new pair is written.
711 * Returns 0 on success.
713 * This function does this:
715 * - it locks the config file by creating ".git/config.lock"
717 * - it then parses the config using store_aux() as validator to find
718 * the position on the key/value pair to replace. If it is to be unset,
719 * it must be found exactly once.
721 * - the config file is mmap()ed and the part before the match (if any) is
722 * written to the lock file, then the changed part and the rest.
724 * - the config file is removed and the lock file rename()d to it.
727 int git_config_set_multivar(const char* key, const char* value,
728 const char* value_regex, int multi_replace)
730 int i, dot;
731 int fd = -1, in_fd;
732 int ret;
733 char* config_filename;
734 char* lock_file;
735 const char* last_dot = strrchr(key, '.');
737 config_filename = getenv(CONFIG_ENVIRONMENT);
738 if (!config_filename) {
739 config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
740 if (!config_filename)
741 config_filename = git_path("config");
743 config_filename = xstrdup(config_filename);
744 lock_file = xstrdup(mkpath("%s.lock", config_filename));
747 * Since "key" actually contains the section name and the real
748 * key name separated by a dot, we have to know where the dot is.
751 if (last_dot == NULL) {
752 fprintf(stderr, "key does not contain a section: %s\n", key);
753 ret = 2;
754 goto out_free;
756 store.baselen = last_dot - key;
758 store.multi_replace = multi_replace;
761 * Validate the key and while at it, lower case it for matching.
763 store.key = xmalloc(strlen(key) + 1);
764 dot = 0;
765 for (i = 0; key[i]; i++) {
766 unsigned char c = key[i];
767 if (c == '.')
768 dot = 1;
769 /* Leave the extended basename untouched.. */
770 if (!dot || i > store.baselen) {
771 if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
772 fprintf(stderr, "invalid key: %s\n", key);
773 free(store.key);
774 ret = 1;
775 goto out_free;
777 c = tolower(c);
778 } else if (c == '\n') {
779 fprintf(stderr, "invalid key (newline): %s\n", key);
780 free(store.key);
781 ret = 1;
782 goto out_free;
784 store.key[i] = c;
786 store.key[i] = 0;
789 * The lock_file serves a purpose in addition to locking: the new
790 * contents of .git/config will be written into it.
792 fd = open(lock_file, O_WRONLY | O_CREAT | O_EXCL, 0666);
793 if (fd < 0 || adjust_shared_perm(lock_file)) {
794 fprintf(stderr, "could not lock config file\n");
795 free(store.key);
796 ret = -1;
797 goto out_free;
801 * If .git/config does not exist yet, write a minimal version.
803 in_fd = open(config_filename, O_RDONLY);
804 if ( in_fd < 0 ) {
805 free(store.key);
807 if ( ENOENT != errno ) {
808 error("opening %s: %s", config_filename,
809 strerror(errno));
810 ret = 3; /* same as "invalid config file" */
811 goto out_free;
813 /* if nothing to unset, error out */
814 if (value == NULL) {
815 ret = 5;
816 goto out_free;
819 store.key = (char*)key;
820 if (!store_write_section(fd, key) ||
821 !store_write_pair(fd, key, value))
822 goto write_err_out;
823 } else {
824 struct stat st;
825 char* contents;
826 size_t contents_sz, copy_begin, copy_end;
827 int i, new_line = 0;
829 if (value_regex == NULL)
830 store.value_regex = NULL;
831 else {
832 if (value_regex[0] == '!') {
833 store.do_not_match = 1;
834 value_regex++;
835 } else
836 store.do_not_match = 0;
838 store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
839 if (regcomp(store.value_regex, value_regex,
840 REG_EXTENDED)) {
841 fprintf(stderr, "Invalid pattern: %s\n",
842 value_regex);
843 free(store.value_regex);
844 ret = 6;
845 goto out_free;
849 store.offset[0] = 0;
850 store.state = START;
851 store.seen = 0;
854 * After this, store.offset will contain the *end* offset
855 * of the last match, or remain at 0 if no match was found.
856 * As a side effect, we make sure to transform only a valid
857 * existing config file.
859 if (git_config_from_file(store_aux, config_filename)) {
860 fprintf(stderr, "invalid config file\n");
861 free(store.key);
862 if (store.value_regex != NULL) {
863 regfree(store.value_regex);
864 free(store.value_regex);
866 ret = 3;
867 goto out_free;
870 free(store.key);
871 if (store.value_regex != NULL) {
872 regfree(store.value_regex);
873 free(store.value_regex);
876 /* if nothing to unset, or too many matches, error out */
877 if ((store.seen == 0 && value == NULL) ||
878 (store.seen > 1 && multi_replace == 0)) {
879 ret = 5;
880 goto out_free;
883 fstat(in_fd, &st);
884 contents_sz = xsize_t(st.st_size);
885 contents = xmmap(NULL, contents_sz, PROT_READ,
886 MAP_PRIVATE, in_fd, 0);
887 close(in_fd);
889 if (store.seen == 0)
890 store.seen = 1;
892 for (i = 0, copy_begin = 0; i < store.seen; i++) {
893 if (store.offset[i] == 0) {
894 store.offset[i] = copy_end = contents_sz;
895 } else if (store.state != KEY_SEEN) {
896 copy_end = store.offset[i];
897 } else
898 copy_end = find_beginning_of_line(
899 contents, contents_sz,
900 store.offset[i]-2, &new_line);
902 /* write the first part of the config */
903 if (copy_end > copy_begin) {
904 if (write_in_full(fd, contents + copy_begin,
905 copy_end - copy_begin) <
906 copy_end - copy_begin)
907 goto write_err_out;
908 if (new_line &&
909 write_in_full(fd, "\n", 1) != 1)
910 goto write_err_out;
912 copy_begin = store.offset[i];
915 /* write the pair (value == NULL means unset) */
916 if (value != NULL) {
917 if (store.state == START) {
918 if (!store_write_section(fd, key))
919 goto write_err_out;
921 if (!store_write_pair(fd, key, value))
922 goto write_err_out;
925 /* write the rest of the config */
926 if (copy_begin < contents_sz)
927 if (write_in_full(fd, contents + copy_begin,
928 contents_sz - copy_begin) <
929 contents_sz - copy_begin)
930 goto write_err_out;
932 munmap(contents, contents_sz);
933 unlink(config_filename);
936 close(fd);
937 fd = -1;
938 if (rename(lock_file, config_filename) < 0) {
939 fprintf(stderr, "Could not rename the lock file?\n");
940 ret = 4;
941 goto out_free;
944 ret = 0;
946 out_free:
947 if (0 <= fd)
948 close(fd);
949 free(config_filename);
950 if (lock_file) {
951 unlink(lock_file);
952 free(lock_file);
954 return ret;
956 write_err_out:
957 ret = write_error();
958 goto out_free;
962 static int section_name_match (const char *buf, const char *name)
964 int i = 0, j = 0, dot = 0;
965 for (; buf[i] && buf[i] != ']'; i++) {
966 if (!dot && isspace(buf[i])) {
967 dot = 1;
968 if (name[j++] != '.')
969 break;
970 for (i++; isspace(buf[i]); i++)
971 ; /* do nothing */
972 if (buf[i] != '"')
973 break;
974 continue;
976 if (buf[i] == '\\' && dot)
977 i++;
978 else if (buf[i] == '"' && dot) {
979 for (i++; isspace(buf[i]); i++)
980 ; /* do_nothing */
981 break;
983 if (buf[i] != name[j++])
984 break;
986 return (buf[i] == ']' && name[j] == 0);
989 /* if new_name == NULL, the section is removed instead */
990 int git_config_rename_section(const char *old_name, const char *new_name)
992 int ret = 0, remove = 0;
993 char *config_filename;
994 struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
995 int out_fd;
996 char buf[1024];
998 config_filename = getenv(CONFIG_ENVIRONMENT);
999 if (!config_filename) {
1000 config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
1001 if (!config_filename)
1002 config_filename = git_path("config");
1004 config_filename = xstrdup(config_filename);
1005 out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1006 if (out_fd < 0) {
1007 ret = error("Could not lock config file!");
1008 goto out;
1011 if (!(config_file = fopen(config_filename, "rb"))) {
1012 /* no config file means nothing to rename, no error */
1013 goto unlock_and_out;
1016 while (fgets(buf, sizeof(buf), config_file)) {
1017 int i;
1018 int length;
1019 for (i = 0; buf[i] && isspace(buf[i]); i++)
1020 ; /* do nothing */
1021 if (buf[i] == '[') {
1022 /* it's a section */
1023 if (section_name_match (&buf[i+1], old_name)) {
1024 ret++;
1025 if (new_name == NULL) {
1026 remove = 1;
1027 continue;
1029 store.baselen = strlen(new_name);
1030 if (!store_write_section(out_fd, new_name)) {
1031 ret = write_error();
1032 goto out;
1034 continue;
1036 remove = 0;
1038 if (remove)
1039 continue;
1040 length = strlen(buf);
1041 if (write_in_full(out_fd, buf, length) != length) {
1042 ret = write_error();
1043 goto out;
1046 fclose(config_file);
1047 unlock_and_out:
1048 if (close(out_fd) || commit_lock_file(lock) < 0)
1049 ret = error("Cannot commit config file!");
1050 out:
1051 free(config_filename);
1052 return ret;