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#include "exec_cmd.h"
10#define MAXNAME (256)
12static FILE *config_file;
14static const char *config_file_name;
15static int config_linenr;
16static int zlib_compression_seen;
17static int get_next_char(void)
19{
20 int c;
21 FILE *f;
22 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';
32 }
33 }
34 if (c == '\n')
35 config_linenr++;
36 if (c == EOF) {
37 config_file = NULL;
38 c = '\n';
39 }
40 }
41 return c;
42}
43static char *parse_value(void)
45{
46 static char value[1024];
47 int quote = 0, comment = 0, len = 0, space = 0;
48 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;
58 }
59 if (comment)
60 continue;
61 if (isspace(c) && !quote) {
62 space = 1;
63 continue;
64 }
65 if (!quote) {
66 if (c == ';' || c == '#') {
67 comment = 1;
68 continue;
69 }
70 }
71 if (space) {
72 if (len)
73 value[len++] = ' ';
74 space = 0;
75 }
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;
96 }
97 value[len++] = c;
98 continue;
99 }
100 if (c == '"') {
101 quote = 1-quote;
102 continue;
103 }
104 value[len++] = c;
105 }
106}
107static inline int iskeychar(int c)
109{
110 return isalnum(c) || c == '-';
111}
112static int get_value(config_fn_t fn, char *name, unsigned int len)
114{
115 int c;
116 char *value;
117 /* 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;
128 }
129 name[len] = 0;
130 while (c == ' ' || c == '\t')
131 c = get_next_char();
132 value = NULL;
134 if (c != '\n') {
135 if (c != '=')
136 return -1;
137 value = parse_value();
138 if (!value)
139 return -1;
140 }
141 return fn(name, value);
142}
143static int get_extended_base_var(char *name, int baselen, int c)
145{
146 do {
147 if (c == '\n')
148 return -1;
149 c = get_next_char();
150 } while (isspace(c));
151 /* We require the format to be '[base "extension"]' */
153 if (c != '"')
154 return -1;
155 name[baselen++] = '.';
156 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;
167 }
168 name[baselen++] = c;
169 if (baselen > MAXNAME / 2)
170 return -1;
171 }
172 /* Final ']' */
174 if (get_next_char() != ']')
175 return -1;
176 return baselen;
177}
178static int get_base_var(char *name)
180{
181 int baselen = 0;
182 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);
196 }
197}
198static int git_parse_file(config_fn_t fn)
200{
201 int comment = 0;
202 int baselen = 0;
203 static char var[MAXNAME];
204 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;
213 }
214 if (comment || isspace(c))
215 continue;
216 if (c == '#' || c == ';') {
217 comment = 1;
218 continue;
219 }
220 if (c == '[') {
221 baselen = get_base_var(var);
222 if (baselen <= 0)
223 break;
224 var[baselen++] = '.';
225 var[baselen] = 0;
226 continue;
227 }
228 if (!isalpha(c))
229 break;
230 var[baselen] = tolower(c);
231 if (get_value(fn, var, baselen+1) < 0)
232 break;
233 }
234 die("bad config file line %d in %s", config_linenr, config_file_name);
235}
236static unsigned long get_unit_factor(const char *end)
238{
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);
248}
249int git_parse_long(const char *value, long *ret)
251{
252 if (value && *value) {
253 char *end;
254 long val = strtol(value, &end, 0);
255 *ret = val * get_unit_factor(end);
256 return 1;
257 }
258 return 0;
259}
260int git_parse_ulong(const char *value, unsigned long *ret)
262{
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;
268 }
269 return 0;
270}
271int git_config_int(const char *name, const char *value)
273{
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;
278}
279unsigned long git_config_ulong(const char *name, const char *value)
281{
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;
286}
287int git_config_bool(const char *name, const char *value)
289{
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;
299}
300int git_default_config(const char *var, const char *value)
302{
303 /* This needs a better name */
304 if (!strcmp(var, "core.filemode")) {
305 trust_executable_bit = git_config_bool(var, value);
306 return 0;
307 }
308 if (!strcmp(var, "core.quotepath")) {
310 quote_path_fully = git_config_bool(var, value);
311 return 0;
312 }
313 if (!strcmp(var, "core.symlinks")) {
315 has_symlinks = git_config_bool(var, value);
316 return 0;
317 }
318 if (!strcmp(var, "core.bare")) {
320 is_bare_repository_cfg = git_config_bool(var, value);
321 return 0;
322 }
323 if (!strcmp(var, "core.ignorestat")) {
325 assume_unchanged = git_config_bool(var, value);
326 return 0;
327 }
328 if (!strcmp(var, "core.prefersymlinkrefs")) {
330 prefer_symlink_refs = git_config_bool(var, value);
331 return 0;
332 }
333 if (!strcmp(var, "core.logallrefupdates")) {
335 log_all_ref_updates = git_config_bool(var, value);
336 return 0;
337 }
338 if (!strcmp(var, "core.warnambiguousrefs")) {
340 warn_ambiguous_refs = git_config_bool(var, value);
341 return 0;
342 }
343 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;
353 }
354 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;
366 }
367 if (!strcmp(var, "core.packedgitwindowsize")) {
369 int pgsz_x2 = getpagesize() * 2;
370 packed_git_window_size = git_config_int(var, value);
371 /* 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;
378 }
379 if (!strcmp(var, "core.packedgitlimit")) {
381 packed_git_limit = git_config_int(var, value);
382 return 0;
383 }
384 if (!strcmp(var, "core.deltabasecachelimit")) {
386 delta_base_cache_limit = git_config_int(var, value);
387 return 0;
388 }
389 if (!strcmp(var, "core.autocrlf")) {
391 if (value && !strcasecmp(value, "input")) {
392 auto_crlf = -1;
393 return 0;
394 }
395 auto_crlf = git_config_bool(var, value);
396 return 0;
397 }
398 if (!strcmp(var, "user.name")) {
400 strlcpy(git_default_name, value, sizeof(git_default_name));
401 return 0;
402 }
403 if (!strcmp(var, "user.email")) {
405 strlcpy(git_default_email, value, sizeof(git_default_email));
406 return 0;
407 }
408 if (!strcmp(var, "i18n.commitencoding")) {
410 git_commit_encoding = xstrdup(value);
411 return 0;
412 }
413 if (!strcmp(var, "i18n.logoutputencoding")) {
415 git_log_output_encoding = xstrdup(value);
416 return 0;
417 }
418 if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
421 pager_use_color = git_config_bool(var,value);
422 return 0;
423 }
424 if (!strcmp(var, "core.pager")) {
426 pager_program = xstrdup(value);
427 return 0;
428 }
429 if (!strcmp(var, "core.editor")) {
431 editor_program = xstrdup(value);
432 return 0;
433 }
434 if (!strcmp(var, "core.excludesfile")) {
436 if (!value)
437 die("core.excludesfile without value");
438 excludes_file = xstrdup(value);
439 return 0;
440 }
441 if (!strcmp(var, "core.whitespace")) {
443 whitespace_rule_cfg = parse_whitespace_rule(value);
444 return 0;
445 }
446 /* Add other config variables here and to Documentation/config.txt. */
448 return 0;
449}
450int git_config_from_file(config_fn_t fn, const char *filename)
452{
453 int ret;
454 FILE *f = fopen(filename, "r");
455 ret = -1;
457 if (f) {
458 config_file = f;
459 config_file_name = filename;
460 config_linenr = 1;
461 ret = git_parse_file(fn);
462 fclose(f);
463 config_file_name = NULL;
464 }
465 return ret;
466}
467const char *git_etc_gitconfig(void)
469{
470 static const char *system_wide;
471 if (!system_wide) {
472 system_wide = ETC_GITCONFIG;
473 if (!is_absolute_path(system_wide)) {
474 /* interpret path relative to exec-dir */
475 const char *exec_path = git_exec_path();
476 system_wide = prefix_path(exec_path, strlen(exec_path),
477 system_wide);
478 }
479 }
480 return system_wide;
481}
482int git_config(config_fn_t fn)
484{
485 int ret = 0;
486 char *repo_config = NULL;
487 const char *home = NULL, *filename;
488 /* $GIT_CONFIG makes git read _only_ the given config file,
490 * $GIT_CONFIG_LOCAL will make it process it in addition to the
491 * global config file, the same way it would the per-repository
492 * config file otherwise. */
493 filename = getenv(CONFIG_ENVIRONMENT);
494 if (!filename) {
495 if (!access(git_etc_gitconfig(), R_OK))
496 ret += git_config_from_file(fn, git_etc_gitconfig());
497 home = getenv("HOME");
498 filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
499 if (!filename)
500 filename = repo_config = xstrdup(git_path("config"));
501 }
502 if (home) {
504 char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
505 if (!access(user_config, R_OK))
506 ret = git_config_from_file(fn, user_config);
507 free(user_config);
508 }
509 ret += git_config_from_file(fn, filename);
511 free(repo_config);
512 return ret;
513}
514/*
516 * Find all the stuff for git_config_set() below.
517 */
518#define MAX_MATCHES 512
520static struct {
522 int baselen;
523 char* key;
524 int do_not_match;
525 regex_t* value_regex;
526 int multi_replace;
527 size_t offset[MAX_MATCHES];
528 enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
529 int seen;
530} store;
531static int matches(const char* key, const char* value)
533{
534 return !strcmp(key, store.key) &&
535 (store.value_regex == NULL ||
536 (store.do_not_match ^
537 !regexec(store.value_regex, value, 0, NULL, 0)));
538}
539static int store_aux(const char* key, const char* value)
541{
542 const char *ep;
543 size_t section_len;
544 switch (store.state) {
546 case KEY_SEEN:
547 if (matches(key, value)) {
548 if (store.seen == 1 && store.multi_replace == 0) {
549 fprintf(stderr,
550 "Warning: %s has multiple values\n",
551 key);
552 } else if (store.seen >= MAX_MATCHES) {
553 fprintf(stderr, "Too many matches\n");
554 return 1;
555 }
556 store.offset[store.seen] = ftell(config_file);
558 store.seen++;
559 }
560 break;
561 case SECTION_SEEN:
562 /*
563 * What we are looking for is in store.key (both
564 * section and var), and its section part is baselen
565 * long. We found key (again, both section and var).
566 * We would want to know if this key is in the same
567 * section as what we are looking for. We already
568 * know we are in the same section as what should
569 * hold store.key.
570 */
571 ep = strrchr(key, '.');
572 section_len = ep - key;
573 if ((section_len != store.baselen) ||
575 memcmp(key, store.key, section_len+1)) {
576 store.state = SECTION_END_SEEN;
577 break;
578 }
579 /*
581 * Do not increment matches: this is no match, but we
582 * just made sure we are in the desired section.
583 */
584 store.offset[store.seen] = ftell(config_file);
585 /* fallthru */
586 case SECTION_END_SEEN:
587 case START:
588 if (matches(key, value)) {
589 store.offset[store.seen] = ftell(config_file);
590 store.state = KEY_SEEN;
591 store.seen++;
592 } else {
593 if (strrchr(key, '.') - key == store.baselen &&
594 !strncmp(key, store.key, store.baselen)) {
595 store.state = SECTION_SEEN;
596 store.offset[store.seen] = ftell(config_file);
597 }
598 }
599 }
600 return 0;
601}
602static int write_error(void)
604{
605 fprintf(stderr, "Failed to write new configuration file\n");
606 /* Same error code as "failed to rename". */
608 return 4;
609}
610static int store_write_section(int fd, const char* key)
612{
613 const char *dot;
614 int i, success;
615 struct strbuf sb;
616 strbuf_init(&sb, 0);
618 dot = memchr(key, '.', store.baselen);
619 if (dot) {
620 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
621 for (i = dot - key + 1; i < store.baselen; i++) {
622 if (key[i] == '"')
623 strbuf_addch(&sb, '\\');
624 strbuf_addch(&sb, key[i]);
625 }
626 strbuf_addstr(&sb, "\"]\n");
627 } else {
628 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
629 }
630 success = write_in_full(fd, sb.buf, sb.len) == sb.len;
632 strbuf_release(&sb);
633 return success;
635}
636static int store_write_pair(int fd, const char* key, const char* value)
638{
639 int i, success;
640 int length = strlen(key + store.baselen + 1);
641 const char *quote = "";
642 struct strbuf sb;
643 /*
645 * Check to see if the value needs to be surrounded with a dq pair.
646 * Note that problematic characters are always backslash-quoted; this
647 * check is about not losing leading or trailing SP and strings that
648 * follow beginning-of-comment characters (i.e. ';' and '#') by the
649 * configuration parser.
650 */
651 if (value[0] == ' ')
652 quote = "\"";
653 for (i = 0; value[i]; i++)
654 if (value[i] == ';' || value[i] == '#')
655 quote = "\"";
656 if (i && value[i - 1] == ' ')
657 quote = "\"";
658 strbuf_init(&sb, 0);
660 strbuf_addf(&sb, "\t%.*s = %s",
661 length, key + store.baselen + 1, quote);
662 for (i = 0; value[i]; i++)
664 switch (value[i]) {
665 case '\n':
666 strbuf_addstr(&sb, "\\n");
667 break;
668 case '\t':
669 strbuf_addstr(&sb, "\\t");
670 break;
671 case '"':
672 case '\\':
673 strbuf_addch(&sb, '\\');
674 default:
675 strbuf_addch(&sb, value[i]);
676 break;
677 }
678 strbuf_addf(&sb, "%s\n", quote);
679 success = write_in_full(fd, sb.buf, sb.len) == sb.len;
681 strbuf_release(&sb);
682 return success;
684}
685static ssize_t find_beginning_of_line(const char* contents, size_t size,
687 size_t offset_, int* found_bracket)
688{
689 size_t equal_offset = size, bracket_offset = size;
690 ssize_t offset;
691 for (offset = offset_-2; offset > 0
693 && contents[offset] != '\n'; offset--)
694 switch (contents[offset]) {
695 case '=': equal_offset = offset; break;
696 case ']': bracket_offset = offset; break;
697 }
698 if (bracket_offset < equal_offset) {
699 *found_bracket = 1;
700 offset = bracket_offset+1;
701 } else
702 offset++;
703 return offset;
705}
706int git_config_set(const char* key, const char* value)
708{
709 return git_config_set_multivar(key, value, NULL, 0);
710}
711/*
713 * If value==NULL, unset in (remove from) config,
714 * if value_regex!=NULL, disregard key/value pairs where value does not match.
715 * if multi_replace==0, nothing, or only one matching key/value is replaced,
716 * else all matching key/values (regardless how many) are removed,
717 * before the new pair is written.
718 *
719 * Returns 0 on success.
720 *
721 * This function does this:
722 *
723 * - it locks the config file by creating ".git/config.lock"
724 *
725 * - it then parses the config using store_aux() as validator to find
726 * the position on the key/value pair to replace. If it is to be unset,
727 * it must be found exactly once.
728 *
729 * - the config file is mmap()ed and the part before the match (if any) is
730 * written to the lock file, then the changed part and the rest.
731 *
732 * - the config file is removed and the lock file rename()d to it.
733 *
734 */
735int git_config_set_multivar(const char* key, const char* value,
736 const char* value_regex, int multi_replace)
737{
738 int i, dot;
739 int fd = -1, in_fd;
740 int ret;
741 char* config_filename;
742 struct lock_file *lock = NULL;
743 const char* last_dot = strrchr(key, '.');
744 config_filename = getenv(CONFIG_ENVIRONMENT);
746 if (!config_filename) {
747 config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
748 if (!config_filename)
749 config_filename = git_path("config");
750 }
751 config_filename = xstrdup(config_filename);
752 /*
754 * Since "key" actually contains the section name and the real
755 * key name separated by a dot, we have to know where the dot is.
756 */
757 if (last_dot == NULL) {
759 fprintf(stderr, "key does not contain a section: %s\n", key);
760 ret = 2;
761 goto out_free;
762 }
763 store.baselen = last_dot - key;
764 store.multi_replace = multi_replace;
766 /*
768 * Validate the key and while at it, lower case it for matching.
769 */
770 store.key = xmalloc(strlen(key) + 1);
771 dot = 0;
772 for (i = 0; key[i]; i++) {
773 unsigned char c = key[i];
774 if (c == '.')
775 dot = 1;
776 /* Leave the extended basename untouched.. */
777 if (!dot || i > store.baselen) {
778 if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
779 fprintf(stderr, "invalid key: %s\n", key);
780 free(store.key);
781 ret = 1;
782 goto out_free;
783 }
784 c = tolower(c);
785 } else if (c == '\n') {
786 fprintf(stderr, "invalid key (newline): %s\n", key);
787 free(store.key);
788 ret = 1;
789 goto out_free;
790 }
791 store.key[i] = c;
792 }
793 store.key[i] = 0;
794 /*
796 * The lock serves a purpose in addition to locking: the new
797 * contents of .git/config will be written into it.
798 */
799 lock = xcalloc(sizeof(struct lock_file), 1);
800 fd = hold_lock_file_for_update(lock, config_filename, 0);
801 if (fd < 0) {
802 fprintf(stderr, "could not lock config file\n");
803 free(store.key);
804 ret = -1;
805 goto out_free;
806 }
807 /*
809 * If .git/config does not exist yet, write a minimal version.
810 */
811 in_fd = open(config_filename, O_RDONLY);
812 if ( in_fd < 0 ) {
813 free(store.key);
814 if ( ENOENT != errno ) {
816 error("opening %s: %s", config_filename,
817 strerror(errno));
818 ret = 3; /* same as "invalid config file" */
819 goto out_free;
820 }
821 /* if nothing to unset, error out */
822 if (value == NULL) {
823 ret = 5;
824 goto out_free;
825 }
826 store.key = (char*)key;
828 if (!store_write_section(fd, key) ||
829 !store_write_pair(fd, key, value))
830 goto write_err_out;
831 } else {
832 struct stat st;
833 char* contents;
834 size_t contents_sz, copy_begin, copy_end;
835 int i, new_line = 0;
836 if (value_regex == NULL)
838 store.value_regex = NULL;
839 else {
840 if (value_regex[0] == '!') {
841 store.do_not_match = 1;
842 value_regex++;
843 } else
844 store.do_not_match = 0;
845 store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
847 if (regcomp(store.value_regex, value_regex,
848 REG_EXTENDED)) {
849 fprintf(stderr, "Invalid pattern: %s\n",
850 value_regex);
851 free(store.value_regex);
852 ret = 6;
853 goto out_free;
854 }
855 }
856 store.offset[0] = 0;
858 store.state = START;
859 store.seen = 0;
860 /*
862 * After this, store.offset will contain the *end* offset
863 * of the last match, or remain at 0 if no match was found.
864 * As a side effect, we make sure to transform only a valid
865 * existing config file.
866 */
867 if (git_config_from_file(store_aux, config_filename)) {
868 fprintf(stderr, "invalid config file\n");
869 free(store.key);
870 if (store.value_regex != NULL) {
871 regfree(store.value_regex);
872 free(store.value_regex);
873 }
874 ret = 3;
875 goto out_free;
876 }
877 free(store.key);
879 if (store.value_regex != NULL) {
880 regfree(store.value_regex);
881 free(store.value_regex);
882 }
883 /* if nothing to unset, or too many matches, error out */
885 if ((store.seen == 0 && value == NULL) ||
886 (store.seen > 1 && multi_replace == 0)) {
887 ret = 5;
888 goto out_free;
889 }
890 fstat(in_fd, &st);
892 contents_sz = xsize_t(st.st_size);
893 contents = xmmap(NULL, contents_sz, PROT_READ,
894 MAP_PRIVATE, in_fd, 0);
895 close(in_fd);
896 if (store.seen == 0)
898 store.seen = 1;
899 for (i = 0, copy_begin = 0; i < store.seen; i++) {
901 if (store.offset[i] == 0) {
902 store.offset[i] = copy_end = contents_sz;
903 } else if (store.state != KEY_SEEN) {
904 copy_end = store.offset[i];
905 } else
906 copy_end = find_beginning_of_line(
907 contents, contents_sz,
908 store.offset[i]-2, &new_line);
909 /* write the first part of the config */
911 if (copy_end > copy_begin) {
912 if (write_in_full(fd, contents + copy_begin,
913 copy_end - copy_begin) <
914 copy_end - copy_begin)
915 goto write_err_out;
916 if (new_line &&
917 write_in_full(fd, "\n", 1) != 1)
918 goto write_err_out;
919 }
920 copy_begin = store.offset[i];
921 }
922 /* write the pair (value == NULL means unset) */
924 if (value != NULL) {
925 if (store.state == START) {
926 if (!store_write_section(fd, key))
927 goto write_err_out;
928 }
929 if (!store_write_pair(fd, key, value))
930 goto write_err_out;
931 }
932 /* write the rest of the config */
934 if (copy_begin < contents_sz)
935 if (write_in_full(fd, contents + copy_begin,
936 contents_sz - copy_begin) <
937 contents_sz - copy_begin)
938 goto write_err_out;
939 munmap(contents, contents_sz);
941 }
942 if (close(fd) || commit_lock_file(lock) < 0) {
944 fprintf(stderr, "Cannot commit config file!\n");
945 ret = 4;
946 goto out_free;
947 }
948 /* fd is closed, so don't try to close it below. */
950 fd = -1;
951 /*
952 * lock is committed, so don't try to roll it back below.
953 * NOTE: Since lockfile.c keeps a linked list of all created
954 * lock_file structures, it isn't safe to free(lock). It's
955 * better to just leave it hanging around.
956 */
957 lock = NULL;
958 ret = 0;
959out_free:
961 if (0 <= fd)
962 close(fd);
963 if (lock)
964 rollback_lock_file(lock);
965 free(config_filename);
966 return ret;
967write_err_out:
969 ret = write_error();
970 goto out_free;
971}
973static int section_name_match (const char *buf, const char *name)
975{
976 int i = 0, j = 0, dot = 0;
977 for (; buf[i] && buf[i] != ']'; i++) {
978 if (!dot && isspace(buf[i])) {
979 dot = 1;
980 if (name[j++] != '.')
981 break;
982 for (i++; isspace(buf[i]); i++)
983 ; /* do nothing */
984 if (buf[i] != '"')
985 break;
986 continue;
987 }
988 if (buf[i] == '\\' && dot)
989 i++;
990 else if (buf[i] == '"' && dot) {
991 for (i++; isspace(buf[i]); i++)
992 ; /* do_nothing */
993 break;
994 }
995 if (buf[i] != name[j++])
996 break;
997 }
998 return (buf[i] == ']' && name[j] == 0);
999}
1000/* if new_name == NULL, the section is removed instead */
1002int git_config_rename_section(const char *old_name, const char *new_name)
1003{
1004 int ret = 0, remove = 0;
1005 char *config_filename;
1006 struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1007 int out_fd;
1008 char buf[1024];
1009 config_filename = getenv(CONFIG_ENVIRONMENT);
1011 if (!config_filename) {
1012 config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
1013 if (!config_filename)
1014 config_filename = git_path("config");
1015 }
1016 config_filename = xstrdup(config_filename);
1017 out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1018 if (out_fd < 0) {
1019 ret = error("Could not lock config file!");
1020 goto out;
1021 }
1022 if (!(config_file = fopen(config_filename, "rb"))) {
1024 /* no config file means nothing to rename, no error */
1025 goto unlock_and_out;
1026 }
1027 while (fgets(buf, sizeof(buf), config_file)) {
1029 int i;
1030 int length;
1031 for (i = 0; buf[i] && isspace(buf[i]); i++)
1032 ; /* do nothing */
1033 if (buf[i] == '[') {
1034 /* it's a section */
1035 if (section_name_match (&buf[i+1], old_name)) {
1036 ret++;
1037 if (new_name == NULL) {
1038 remove = 1;
1039 continue;
1040 }
1041 store.baselen = strlen(new_name);
1042 if (!store_write_section(out_fd, new_name)) {
1043 ret = write_error();
1044 goto out;
1045 }
1046 continue;
1047 }
1048 remove = 0;
1049 }
1050 if (remove)
1051 continue;
1052 length = strlen(buf);
1053 if (write_in_full(out_fd, buf, length) != length) {
1054 ret = write_error();
1055 goto out;
1056 }
1057 }
1058 fclose(config_file);
1059 unlock_and_out:
1060 if (close(out_fd) || commit_lock_file(lock) < 0)
1061 ret = error("Cannot commit config file!");
1062 out:
1063 free(config_filename);
1064 return ret;
1065}