git-cvsserver runs hooks/post-update
[git/gitweb.git] / config.c
blobed96213c44265289c26d46edaaf740cebd0b4c86
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 if (!strcmp(var, "core.editor")) {
431 editor_program = xstrdup(value);
432 return 0;
435 if (!strcmp(var, "core.excludesfile")) {
436 if (!value)
437 die("core.excludesfile without value");
438 excludes_file = xstrdup(value);
439 return 0;
442 /* Add other config variables here and to Documentation/config.txt. */
443 return 0;
446 int git_config_from_file(config_fn_t fn, const char *filename)
448 int ret;
449 FILE *f = fopen(filename, "r");
451 ret = -1;
452 if (f) {
453 config_file = f;
454 config_file_name = filename;
455 config_linenr = 1;
456 ret = git_parse_file(fn);
457 fclose(f);
458 config_file_name = NULL;
460 return ret;
463 const char *git_etc_gitconfig(void)
465 static const char *system_wide;
466 if (!system_wide) {
467 system_wide = ETC_GITCONFIG;
468 if (!is_absolute_path(system_wide)) {
469 /* interpret path relative to exec-dir */
470 const char *exec_path = git_exec_path();
471 system_wide = prefix_path(exec_path, strlen(exec_path),
472 system_wide);
475 return system_wide;
478 int git_config(config_fn_t fn)
480 int ret = 0;
481 char *repo_config = NULL;
482 const char *home = NULL, *filename;
484 /* $GIT_CONFIG makes git read _only_ the given config file,
485 * $GIT_CONFIG_LOCAL will make it process it in addition to the
486 * global config file, the same way it would the per-repository
487 * config file otherwise. */
488 filename = getenv(CONFIG_ENVIRONMENT);
489 if (!filename) {
490 if (!access(git_etc_gitconfig(), R_OK))
491 ret += git_config_from_file(fn, git_etc_gitconfig());
492 home = getenv("HOME");
493 filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
494 if (!filename)
495 filename = repo_config = xstrdup(git_path("config"));
498 if (home) {
499 char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
500 if (!access(user_config, R_OK))
501 ret = git_config_from_file(fn, user_config);
502 free(user_config);
505 ret += git_config_from_file(fn, filename);
506 free(repo_config);
507 return ret;
511 * Find all the stuff for git_config_set() below.
514 #define MAX_MATCHES 512
516 static struct {
517 int baselen;
518 char* key;
519 int do_not_match;
520 regex_t* value_regex;
521 int multi_replace;
522 size_t offset[MAX_MATCHES];
523 enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
524 int seen;
525 } store;
527 static int matches(const char* key, const char* value)
529 return !strcmp(key, store.key) &&
530 (store.value_regex == NULL ||
531 (store.do_not_match ^
532 !regexec(store.value_regex, value, 0, NULL, 0)));
535 static int store_aux(const char* key, const char* value)
537 const char *ep;
538 size_t section_len;
540 switch (store.state) {
541 case KEY_SEEN:
542 if (matches(key, value)) {
543 if (store.seen == 1 && store.multi_replace == 0) {
544 fprintf(stderr,
545 "Warning: %s has multiple values\n",
546 key);
547 } else if (store.seen >= MAX_MATCHES) {
548 fprintf(stderr, "Too many matches\n");
549 return 1;
552 store.offset[store.seen] = ftell(config_file);
553 store.seen++;
555 break;
556 case SECTION_SEEN:
558 * What we are looking for is in store.key (both
559 * section and var), and its section part is baselen
560 * long. We found key (again, both section and var).
561 * We would want to know if this key is in the same
562 * section as what we are looking for. We already
563 * know we are in the same section as what should
564 * hold store.key.
566 ep = strrchr(key, '.');
567 section_len = ep - key;
569 if ((section_len != store.baselen) ||
570 memcmp(key, store.key, section_len+1)) {
571 store.state = SECTION_END_SEEN;
572 break;
576 * Do not increment matches: this is no match, but we
577 * just made sure we are in the desired section.
579 store.offset[store.seen] = ftell(config_file);
580 /* fallthru */
581 case SECTION_END_SEEN:
582 case START:
583 if (matches(key, value)) {
584 store.offset[store.seen] = ftell(config_file);
585 store.state = KEY_SEEN;
586 store.seen++;
587 } else {
588 if (strrchr(key, '.') - key == store.baselen &&
589 !strncmp(key, store.key, store.baselen)) {
590 store.state = SECTION_SEEN;
591 store.offset[store.seen] = ftell(config_file);
595 return 0;
598 static int write_error(void)
600 fprintf(stderr, "Failed to write new configuration file\n");
602 /* Same error code as "failed to rename". */
603 return 4;
606 static int store_write_section(int fd, const char* key)
608 const char *dot = strchr(key, '.');
609 int len1 = store.baselen, len2 = -1;
611 dot = strchr(key, '.');
612 if (dot) {
613 int dotlen = dot - key;
614 if (dotlen < len1) {
615 len2 = len1 - dotlen - 1;
616 len1 = dotlen;
620 if (write_in_full(fd, "[", 1) != 1 ||
621 write_in_full(fd, key, len1) != len1)
622 return 0;
623 if (len2 >= 0) {
624 if (write_in_full(fd, " \"", 2) != 2)
625 return 0;
626 while (--len2 >= 0) {
627 unsigned char c = *++dot;
628 if (c == '"')
629 if (write_in_full(fd, "\\", 1) != 1)
630 return 0;
631 if (write_in_full(fd, &c, 1) != 1)
632 return 0;
634 if (write_in_full(fd, "\"", 1) != 1)
635 return 0;
637 if (write_in_full(fd, "]\n", 2) != 2)
638 return 0;
640 return 1;
643 static int store_write_pair(int fd, const char* key, const char* value)
645 int i;
646 int length = strlen(key+store.baselen+1);
647 int quote = 0;
649 /* Check to see if the value needs to be quoted. */
650 if (value[0] == ' ')
651 quote = 1;
652 for (i = 0; value[i]; i++)
653 if (value[i] == ';' || value[i] == '#')
654 quote = 1;
655 if (value[i-1] == ' ')
656 quote = 1;
658 if (write_in_full(fd, "\t", 1) != 1 ||
659 write_in_full(fd, key+store.baselen+1, length) != length ||
660 write_in_full(fd, " = ", 3) != 3)
661 return 0;
662 if (quote && write_in_full(fd, "\"", 1) != 1)
663 return 0;
664 for (i = 0; value[i]; i++)
665 switch (value[i]) {
666 case '\n':
667 if (write_in_full(fd, "\\n", 2) != 2)
668 return 0;
669 break;
670 case '\t':
671 if (write_in_full(fd, "\\t", 2) != 2)
672 return 0;
673 break;
674 case '"':
675 case '\\':
676 if (write_in_full(fd, "\\", 1) != 1)
677 return 0;
678 default:
679 if (write_in_full(fd, value+i, 1) != 1)
680 return 0;
681 break;
683 if (quote && write_in_full(fd, "\"", 1) != 1)
684 return 0;
685 if (write_in_full(fd, "\n", 1) != 1)
686 return 0;
687 return 1;
690 static ssize_t find_beginning_of_line(const char* contents, size_t size,
691 size_t offset_, int* found_bracket)
693 size_t equal_offset = size, bracket_offset = size;
694 ssize_t offset;
696 for (offset = offset_-2; offset > 0
697 && contents[offset] != '\n'; offset--)
698 switch (contents[offset]) {
699 case '=': equal_offset = offset; break;
700 case ']': bracket_offset = offset; break;
702 if (bracket_offset < equal_offset) {
703 *found_bracket = 1;
704 offset = bracket_offset+1;
705 } else
706 offset++;
708 return offset;
711 int git_config_set(const char* key, const char* value)
713 return git_config_set_multivar(key, value, NULL, 0);
717 * If value==NULL, unset in (remove from) config,
718 * if value_regex!=NULL, disregard key/value pairs where value does not match.
719 * if multi_replace==0, nothing, or only one matching key/value is replaced,
720 * else all matching key/values (regardless how many) are removed,
721 * before the new pair is written.
723 * Returns 0 on success.
725 * This function does this:
727 * - it locks the config file by creating ".git/config.lock"
729 * - it then parses the config using store_aux() as validator to find
730 * the position on the key/value pair to replace. If it is to be unset,
731 * it must be found exactly once.
733 * - the config file is mmap()ed and the part before the match (if any) is
734 * written to the lock file, then the changed part and the rest.
736 * - the config file is removed and the lock file rename()d to it.
739 int git_config_set_multivar(const char* key, const char* value,
740 const char* value_regex, int multi_replace)
742 int i, dot;
743 int fd = -1, in_fd;
744 int ret;
745 char* config_filename;
746 struct lock_file *lock = NULL;
747 const char* last_dot = strrchr(key, '.');
749 config_filename = getenv(CONFIG_ENVIRONMENT);
750 if (!config_filename) {
751 config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
752 if (!config_filename)
753 config_filename = git_path("config");
755 config_filename = xstrdup(config_filename);
758 * Since "key" actually contains the section name and the real
759 * key name separated by a dot, we have to know where the dot is.
762 if (last_dot == NULL) {
763 fprintf(stderr, "key does not contain a section: %s\n", key);
764 ret = 2;
765 goto out_free;
767 store.baselen = last_dot - key;
769 store.multi_replace = multi_replace;
772 * Validate the key and while at it, lower case it for matching.
774 store.key = xmalloc(strlen(key) + 1);
775 dot = 0;
776 for (i = 0; key[i]; i++) {
777 unsigned char c = key[i];
778 if (c == '.')
779 dot = 1;
780 /* Leave the extended basename untouched.. */
781 if (!dot || i > store.baselen) {
782 if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
783 fprintf(stderr, "invalid key: %s\n", key);
784 free(store.key);
785 ret = 1;
786 goto out_free;
788 c = tolower(c);
789 } else if (c == '\n') {
790 fprintf(stderr, "invalid key (newline): %s\n", key);
791 free(store.key);
792 ret = 1;
793 goto out_free;
795 store.key[i] = c;
797 store.key[i] = 0;
800 * The lock serves a purpose in addition to locking: the new
801 * contents of .git/config will be written into it.
803 lock = xcalloc(sizeof(struct lock_file), 1);
804 fd = hold_lock_file_for_update(lock, config_filename, 0);
805 if (fd < 0) {
806 fprintf(stderr, "could not lock config file\n");
807 free(store.key);
808 ret = -1;
809 goto out_free;
813 * If .git/config does not exist yet, write a minimal version.
815 in_fd = open(config_filename, O_RDONLY);
816 if ( in_fd < 0 ) {
817 free(store.key);
819 if ( ENOENT != errno ) {
820 error("opening %s: %s", config_filename,
821 strerror(errno));
822 ret = 3; /* same as "invalid config file" */
823 goto out_free;
825 /* if nothing to unset, error out */
826 if (value == NULL) {
827 ret = 5;
828 goto out_free;
831 store.key = (char*)key;
832 if (!store_write_section(fd, key) ||
833 !store_write_pair(fd, key, value))
834 goto write_err_out;
835 } else {
836 struct stat st;
837 char* contents;
838 size_t contents_sz, copy_begin, copy_end;
839 int i, new_line = 0;
841 if (value_regex == NULL)
842 store.value_regex = NULL;
843 else {
844 if (value_regex[0] == '!') {
845 store.do_not_match = 1;
846 value_regex++;
847 } else
848 store.do_not_match = 0;
850 store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
851 if (regcomp(store.value_regex, value_regex,
852 REG_EXTENDED)) {
853 fprintf(stderr, "Invalid pattern: %s\n",
854 value_regex);
855 free(store.value_regex);
856 ret = 6;
857 goto out_free;
861 store.offset[0] = 0;
862 store.state = START;
863 store.seen = 0;
866 * After this, store.offset will contain the *end* offset
867 * of the last match, or remain at 0 if no match was found.
868 * As a side effect, we make sure to transform only a valid
869 * existing config file.
871 if (git_config_from_file(store_aux, config_filename)) {
872 fprintf(stderr, "invalid config file\n");
873 free(store.key);
874 if (store.value_regex != NULL) {
875 regfree(store.value_regex);
876 free(store.value_regex);
878 ret = 3;
879 goto out_free;
882 free(store.key);
883 if (store.value_regex != NULL) {
884 regfree(store.value_regex);
885 free(store.value_regex);
888 /* if nothing to unset, or too many matches, error out */
889 if ((store.seen == 0 && value == NULL) ||
890 (store.seen > 1 && multi_replace == 0)) {
891 ret = 5;
892 goto out_free;
895 fstat(in_fd, &st);
896 contents_sz = xsize_t(st.st_size);
897 contents = xmmap(NULL, contents_sz, PROT_READ,
898 MAP_PRIVATE, in_fd, 0);
899 close(in_fd);
901 if (store.seen == 0)
902 store.seen = 1;
904 for (i = 0, copy_begin = 0; i < store.seen; i++) {
905 if (store.offset[i] == 0) {
906 store.offset[i] = copy_end = contents_sz;
907 } else if (store.state != KEY_SEEN) {
908 copy_end = store.offset[i];
909 } else
910 copy_end = find_beginning_of_line(
911 contents, contents_sz,
912 store.offset[i]-2, &new_line);
914 /* write the first part of the config */
915 if (copy_end > copy_begin) {
916 if (write_in_full(fd, contents + copy_begin,
917 copy_end - copy_begin) <
918 copy_end - copy_begin)
919 goto write_err_out;
920 if (new_line &&
921 write_in_full(fd, "\n", 1) != 1)
922 goto write_err_out;
924 copy_begin = store.offset[i];
927 /* write the pair (value == NULL means unset) */
928 if (value != NULL) {
929 if (store.state == START) {
930 if (!store_write_section(fd, key))
931 goto write_err_out;
933 if (!store_write_pair(fd, key, value))
934 goto write_err_out;
937 /* write the rest of the config */
938 if (copy_begin < contents_sz)
939 if (write_in_full(fd, contents + copy_begin,
940 contents_sz - copy_begin) <
941 contents_sz - copy_begin)
942 goto write_err_out;
944 munmap(contents, contents_sz);
947 if (close(fd) || commit_lock_file(lock) < 0) {
948 fprintf(stderr, "Cannot commit config file!\n");
949 ret = 4;
950 goto out_free;
953 /* fd is closed, so don't try to close it below. */
954 fd = -1;
956 * lock is committed, so don't try to roll it back below.
957 * NOTE: Since lockfile.c keeps a linked list of all created
958 * lock_file structures, it isn't safe to free(lock). It's
959 * better to just leave it hanging around.
961 lock = NULL;
962 ret = 0;
964 out_free:
965 if (0 <= fd)
966 close(fd);
967 if (lock)
968 rollback_lock_file(lock);
969 free(config_filename);
970 return ret;
972 write_err_out:
973 ret = write_error();
974 goto out_free;
978 static int section_name_match (const char *buf, const char *name)
980 int i = 0, j = 0, dot = 0;
981 for (; buf[i] && buf[i] != ']'; i++) {
982 if (!dot && isspace(buf[i])) {
983 dot = 1;
984 if (name[j++] != '.')
985 break;
986 for (i++; isspace(buf[i]); i++)
987 ; /* do nothing */
988 if (buf[i] != '"')
989 break;
990 continue;
992 if (buf[i] == '\\' && dot)
993 i++;
994 else if (buf[i] == '"' && dot) {
995 for (i++; isspace(buf[i]); i++)
996 ; /* do_nothing */
997 break;
999 if (buf[i] != name[j++])
1000 break;
1002 return (buf[i] == ']' && name[j] == 0);
1005 /* if new_name == NULL, the section is removed instead */
1006 int git_config_rename_section(const char *old_name, const char *new_name)
1008 int ret = 0, remove = 0;
1009 char *config_filename;
1010 struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1011 int out_fd;
1012 char buf[1024];
1014 config_filename = getenv(CONFIG_ENVIRONMENT);
1015 if (!config_filename) {
1016 config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
1017 if (!config_filename)
1018 config_filename = git_path("config");
1020 config_filename = xstrdup(config_filename);
1021 out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1022 if (out_fd < 0) {
1023 ret = error("Could not lock config file!");
1024 goto out;
1027 if (!(config_file = fopen(config_filename, "rb"))) {
1028 /* no config file means nothing to rename, no error */
1029 goto unlock_and_out;
1032 while (fgets(buf, sizeof(buf), config_file)) {
1033 int i;
1034 int length;
1035 for (i = 0; buf[i] && isspace(buf[i]); i++)
1036 ; /* do nothing */
1037 if (buf[i] == '[') {
1038 /* it's a section */
1039 if (section_name_match (&buf[i+1], old_name)) {
1040 ret++;
1041 if (new_name == NULL) {
1042 remove = 1;
1043 continue;
1045 store.baselen = strlen(new_name);
1046 if (!store_write_section(out_fd, new_name)) {
1047 ret = write_error();
1048 goto out;
1050 continue;
1052 remove = 0;
1054 if (remove)
1055 continue;
1056 length = strlen(buf);
1057 if (write_in_full(out_fd, buf, length) != length) {
1058 ret = write_error();
1059 goto out;
1062 fclose(config_file);
1063 unlock_and_out:
1064 if (close(out_fd) || commit_lock_file(lock) < 0)
1065 ret = error("Cannot commit config file!");
1066 out:
1067 free(config_filename);
1068 return ret;