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 if (!strcmp(var, "core.excludesfile")) {
435 if (!value)
436 die("core.excludesfile without value");
437 excludes_file = xstrdup(value);
438 return 0;
439 }
440 /* Add other config variables here and to Documentation/config.txt. */
442 return 0;
443}
444int git_config_from_file(config_fn_t fn, const char *filename)
446{
447 int ret;
448 FILE *f = fopen(filename, "r");
449 ret = -1;
451 if (f) {
452 config_file = f;
453 config_file_name = filename;
454 config_linenr = 1;
455 ret = git_parse_file(fn);
456 fclose(f);
457 config_file_name = NULL;
458 }
459 return ret;
460}
461int git_config(config_fn_t fn)
463{
464 int ret = 0;
465 char *repo_config = NULL;
466 const char *home = NULL, *filename;
467 /* $GIT_CONFIG makes git read _only_ the given config file,
469 * $GIT_CONFIG_LOCAL will make it process it in addition to the
470 * global config file, the same way it would the per-repository
471 * config file otherwise. */
472 filename = getenv(CONFIG_ENVIRONMENT);
473 if (!filename) {
474 if (!access(ETC_GITCONFIG, R_OK))
475 ret += git_config_from_file(fn, ETC_GITCONFIG);
476 home = getenv("HOME");
477 filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
478 if (!filename)
479 filename = repo_config = xstrdup(git_path("config"));
480 }
481 if (home) {
483 char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
484 if (!access(user_config, R_OK))
485 ret = git_config_from_file(fn, user_config);
486 free(user_config);
487 }
488 ret += git_config_from_file(fn, filename);
490 free(repo_config);
491 return ret;
492}
493/*
495 * Find all the stuff for git_config_set() below.
496 */
497#define MAX_MATCHES 512
499static struct {
501 int baselen;
502 char* key;
503 int do_not_match;
504 regex_t* value_regex;
505 int multi_replace;
506 size_t offset[MAX_MATCHES];
507 enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
508 int seen;
509} store;
510static int matches(const char* key, const char* value)
512{
513 return !strcmp(key, store.key) &&
514 (store.value_regex == NULL ||
515 (store.do_not_match ^
516 !regexec(store.value_regex, value, 0, NULL, 0)));
517}
518static int store_aux(const char* key, const char* value)
520{
521 const char *ep;
522 size_t section_len;
523 switch (store.state) {
525 case KEY_SEEN:
526 if (matches(key, value)) {
527 if (store.seen == 1 && store.multi_replace == 0) {
528 fprintf(stderr,
529 "Warning: %s has multiple values\n",
530 key);
531 } else if (store.seen >= MAX_MATCHES) {
532 fprintf(stderr, "Too many matches\n");
533 return 1;
534 }
535 store.offset[store.seen] = ftell(config_file);
537 store.seen++;
538 }
539 break;
540 case SECTION_SEEN:
541 /*
542 * What we are looking for is in store.key (both
543 * section and var), and its section part is baselen
544 * long. We found key (again, both section and var).
545 * We would want to know if this key is in the same
546 * section as what we are looking for. We already
547 * know we are in the same section as what should
548 * hold store.key.
549 */
550 ep = strrchr(key, '.');
551 section_len = ep - key;
552 if ((section_len != store.baselen) ||
554 memcmp(key, store.key, section_len+1)) {
555 store.state = SECTION_END_SEEN;
556 break;
557 }
558 /*
560 * Do not increment matches: this is no match, but we
561 * just made sure we are in the desired section.
562 */
563 store.offset[store.seen] = ftell(config_file);
564 /* fallthru */
565 case SECTION_END_SEEN:
566 case START:
567 if (matches(key, value)) {
568 store.offset[store.seen] = ftell(config_file);
569 store.state = KEY_SEEN;
570 store.seen++;
571 } else {
572 if (strrchr(key, '.') - key == store.baselen &&
573 !strncmp(key, store.key, store.baselen)) {
574 store.state = SECTION_SEEN;
575 store.offset[store.seen] = ftell(config_file);
576 }
577 }
578 }
579 return 0;
580}
581static int write_error(void)
583{
584 fprintf(stderr, "Failed to write new configuration file\n");
585 /* Same error code as "failed to rename". */
587 return 4;
588}
589static int store_write_section(int fd, const char* key)
591{
592 const char *dot = strchr(key, '.');
593 int len1 = store.baselen, len2 = -1;
594 dot = strchr(key, '.');
596 if (dot) {
597 int dotlen = dot - key;
598 if (dotlen < len1) {
599 len2 = len1 - dotlen - 1;
600 len1 = dotlen;
601 }
602 }
603 if (write_in_full(fd, "[", 1) != 1 ||
605 write_in_full(fd, key, len1) != len1)
606 return 0;
607 if (len2 >= 0) {
608 if (write_in_full(fd, " \"", 2) != 2)
609 return 0;
610 while (--len2 >= 0) {
611 unsigned char c = *++dot;
612 if (c == '"')
613 if (write_in_full(fd, "\\", 1) != 1)
614 return 0;
615 if (write_in_full(fd, &c, 1) != 1)
616 return 0;
617 }
618 if (write_in_full(fd, "\"", 1) != 1)
619 return 0;
620 }
621 if (write_in_full(fd, "]\n", 2) != 2)
622 return 0;
623 return 1;
625}
626static int store_write_pair(int fd, const char* key, const char* value)
628{
629 int i;
630 int length = strlen(key+store.baselen+1);
631 int quote = 0;
632 /* Check to see if the value needs to be quoted. */
634 if (value[0] == ' ')
635 quote = 1;
636 for (i = 0; value[i]; i++)
637 if (value[i] == ';' || value[i] == '#')
638 quote = 1;
639 if (value[i-1] == ' ')
640 quote = 1;
641 if (write_in_full(fd, "\t", 1) != 1 ||
643 write_in_full(fd, key+store.baselen+1, length) != length ||
644 write_in_full(fd, " = ", 3) != 3)
645 return 0;
646 if (quote && write_in_full(fd, "\"", 1) != 1)
647 return 0;
648 for (i = 0; value[i]; i++)
649 switch (value[i]) {
650 case '\n':
651 if (write_in_full(fd, "\\n", 2) != 2)
652 return 0;
653 break;
654 case '\t':
655 if (write_in_full(fd, "\\t", 2) != 2)
656 return 0;
657 break;
658 case '"':
659 case '\\':
660 if (write_in_full(fd, "\\", 1) != 1)
661 return 0;
662 default:
663 if (write_in_full(fd, value+i, 1) != 1)
664 return 0;
665 break;
666 }
667 if (quote && write_in_full(fd, "\"", 1) != 1)
668 return 0;
669 if (write_in_full(fd, "\n", 1) != 1)
670 return 0;
671 return 1;
672}
673static ssize_t find_beginning_of_line(const char* contents, size_t size,
675 size_t offset_, int* found_bracket)
676{
677 size_t equal_offset = size, bracket_offset = size;
678 ssize_t offset;
679 for (offset = offset_-2; offset > 0
681 && contents[offset] != '\n'; offset--)
682 switch (contents[offset]) {
683 case '=': equal_offset = offset; break;
684 case ']': bracket_offset = offset; break;
685 }
686 if (bracket_offset < equal_offset) {
687 *found_bracket = 1;
688 offset = bracket_offset+1;
689 } else
690 offset++;
691 return offset;
693}
694int git_config_set(const char* key, const char* value)
696{
697 return git_config_set_multivar(key, value, NULL, 0);
698}
699/*
701 * If value==NULL, unset in (remove from) config,
702 * if value_regex!=NULL, disregard key/value pairs where value does not match.
703 * if multi_replace==0, nothing, or only one matching key/value is replaced,
704 * else all matching key/values (regardless how many) are removed,
705 * before the new pair is written.
706 *
707 * Returns 0 on success.
708 *
709 * This function does this:
710 *
711 * - it locks the config file by creating ".git/config.lock"
712 *
713 * - it then parses the config using store_aux() as validator to find
714 * the position on the key/value pair to replace. If it is to be unset,
715 * it must be found exactly once.
716 *
717 * - the config file is mmap()ed and the part before the match (if any) is
718 * written to the lock file, then the changed part and the rest.
719 *
720 * - the config file is removed and the lock file rename()d to it.
721 *
722 */
723int git_config_set_multivar(const char* key, const char* value,
724 const char* value_regex, int multi_replace)
725{
726 int i, dot;
727 int fd = -1, in_fd;
728 int ret;
729 char* config_filename;
730 struct lock_file *lock = NULL;
731 const char* last_dot = strrchr(key, '.');
732 config_filename = getenv(CONFIG_ENVIRONMENT);
734 if (!config_filename) {
735 config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
736 if (!config_filename)
737 config_filename = git_path("config");
738 }
739 config_filename = xstrdup(config_filename);
740 /*
742 * Since "key" actually contains the section name and the real
743 * key name separated by a dot, we have to know where the dot is.
744 */
745 if (last_dot == NULL) {
747 fprintf(stderr, "key does not contain a section: %s\n", key);
748 ret = 2;
749 goto out_free;
750 }
751 store.baselen = last_dot - key;
752 store.multi_replace = multi_replace;
754 /*
756 * Validate the key and while at it, lower case it for matching.
757 */
758 store.key = xmalloc(strlen(key) + 1);
759 dot = 0;
760 for (i = 0; key[i]; i++) {
761 unsigned char c = key[i];
762 if (c == '.')
763 dot = 1;
764 /* Leave the extended basename untouched.. */
765 if (!dot || i > store.baselen) {
766 if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
767 fprintf(stderr, "invalid key: %s\n", key);
768 free(store.key);
769 ret = 1;
770 goto out_free;
771 }
772 c = tolower(c);
773 } else if (c == '\n') {
774 fprintf(stderr, "invalid key (newline): %s\n", key);
775 free(store.key);
776 ret = 1;
777 goto out_free;
778 }
779 store.key[i] = c;
780 }
781 store.key[i] = 0;
782 /*
784 * The lock serves a purpose in addition to locking: the new
785 * contents of .git/config will be written into it.
786 */
787 lock = xcalloc(sizeof(struct lock_file), 1);
788 fd = hold_lock_file_for_update(lock, config_filename, 0);
789 if (fd < 0) {
790 fprintf(stderr, "could not lock config file\n");
791 free(store.key);
792 ret = -1;
793 goto out_free;
794 }
795 /*
797 * If .git/config does not exist yet, write a minimal version.
798 */
799 in_fd = open(config_filename, O_RDONLY);
800 if ( in_fd < 0 ) {
801 free(store.key);
802 if ( ENOENT != errno ) {
804 error("opening %s: %s", config_filename,
805 strerror(errno));
806 ret = 3; /* same as "invalid config file" */
807 goto out_free;
808 }
809 /* if nothing to unset, error out */
810 if (value == NULL) {
811 ret = 5;
812 goto out_free;
813 }
814 store.key = (char*)key;
816 if (!store_write_section(fd, key) ||
817 !store_write_pair(fd, key, value))
818 goto write_err_out;
819 } else {
820 struct stat st;
821 char* contents;
822 size_t contents_sz, copy_begin, copy_end;
823 int i, new_line = 0;
824 if (value_regex == NULL)
826 store.value_regex = NULL;
827 else {
828 if (value_regex[0] == '!') {
829 store.do_not_match = 1;
830 value_regex++;
831 } else
832 store.do_not_match = 0;
833 store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
835 if (regcomp(store.value_regex, value_regex,
836 REG_EXTENDED)) {
837 fprintf(stderr, "Invalid pattern: %s\n",
838 value_regex);
839 free(store.value_regex);
840 ret = 6;
841 goto out_free;
842 }
843 }
844 store.offset[0] = 0;
846 store.state = START;
847 store.seen = 0;
848 /*
850 * After this, store.offset will contain the *end* offset
851 * of the last match, or remain at 0 if no match was found.
852 * As a side effect, we make sure to transform only a valid
853 * existing config file.
854 */
855 if (git_config_from_file(store_aux, config_filename)) {
856 fprintf(stderr, "invalid config file\n");
857 free(store.key);
858 if (store.value_regex != NULL) {
859 regfree(store.value_regex);
860 free(store.value_regex);
861 }
862 ret = 3;
863 goto out_free;
864 }
865 free(store.key);
867 if (store.value_regex != NULL) {
868 regfree(store.value_regex);
869 free(store.value_regex);
870 }
871 /* if nothing to unset, or too many matches, error out */
873 if ((store.seen == 0 && value == NULL) ||
874 (store.seen > 1 && multi_replace == 0)) {
875 ret = 5;
876 goto out_free;
877 }
878 fstat(in_fd, &st);
880 contents_sz = xsize_t(st.st_size);
881 contents = xmmap(NULL, contents_sz, PROT_READ,
882 MAP_PRIVATE, in_fd, 0);
883 close(in_fd);
884 if (store.seen == 0)
886 store.seen = 1;
887 for (i = 0, copy_begin = 0; i < store.seen; i++) {
889 if (store.offset[i] == 0) {
890 store.offset[i] = copy_end = contents_sz;
891 } else if (store.state != KEY_SEEN) {
892 copy_end = store.offset[i];
893 } else
894 copy_end = find_beginning_of_line(
895 contents, contents_sz,
896 store.offset[i]-2, &new_line);
897 /* write the first part of the config */
899 if (copy_end > copy_begin) {
900 if (write_in_full(fd, contents + copy_begin,
901 copy_end - copy_begin) <
902 copy_end - copy_begin)
903 goto write_err_out;
904 if (new_line &&
905 write_in_full(fd, "\n", 1) != 1)
906 goto write_err_out;
907 }
908 copy_begin = store.offset[i];
909 }
910 /* write the pair (value == NULL means unset) */
912 if (value != NULL) {
913 if (store.state == START) {
914 if (!store_write_section(fd, key))
915 goto write_err_out;
916 }
917 if (!store_write_pair(fd, key, value))
918 goto write_err_out;
919 }
920 /* write the rest of the config */
922 if (copy_begin < contents_sz)
923 if (write_in_full(fd, contents + copy_begin,
924 contents_sz - copy_begin) <
925 contents_sz - copy_begin)
926 goto write_err_out;
927 munmap(contents, contents_sz);
929 }
930 if (close(fd) || commit_lock_file(lock) < 0) {
932 fprintf(stderr, "Cannot commit config file!\n");
933 ret = 4;
934 goto out_free;
935 }
936 /* fd is closed, so don't try to close it below. */
938 fd = -1;
939 /*
940 * lock is committed, so don't try to roll it back below.
941 * NOTE: Since lockfile.c keeps a linked list of all created
942 * lock_file structures, it isn't safe to free(lock). It's
943 * better to just leave it hanging around.
944 */
945 lock = NULL;
946 ret = 0;
947out_free:
949 if (0 <= fd)
950 close(fd);
951 if (lock)
952 rollback_lock_file(lock);
953 free(config_filename);
954 return ret;
955write_err_out:
957 ret = write_error();
958 goto out_free;
959}
961static int section_name_match (const char *buf, const char *name)
963{
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;
975 }
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;
982 }
983 if (buf[i] != name[j++])
984 break;
985 }
986 return (buf[i] == ']' && name[j] == 0);
987}
988/* if new_name == NULL, the section is removed instead */
990int git_config_rename_section(const char *old_name, const char *new_name)
991{
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];
997 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");
1003 }
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;
1009 }
1010 if (!(config_file = fopen(config_filename, "rb"))) {
1012 /* no config file means nothing to rename, no error */
1013 goto unlock_and_out;
1014 }
1015 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;
1028 }
1029 store.baselen = strlen(new_name);
1030 if (!store_write_section(out_fd, new_name)) {
1031 ret = write_error();
1032 goto out;
1033 }
1034 continue;
1035 }
1036 remove = 0;
1037 }
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;
1044 }
1045 }
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;
1053}