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 int parse_unit_factor(const char *end, unsigned long *val)
238{
239 if (!*end)
240 return 1;
241 else if (!strcasecmp(end, "k")) {
242 *val *= 1024;
243 return 1;
244 }
245 else if (!strcasecmp(end, "m")) {
246 *val *= 1024 * 1024;
247 return 1;
248 }
249 else if (!strcasecmp(end, "g")) {
250 *val *= 1024 * 1024 * 1024;
251 return 1;
252 }
253 return 0;
254}
255int git_parse_long(const char *value, long *ret)
257{
258 if (value && *value) {
259 char *end;
260 long val = strtol(value, &end, 0);
261 unsigned long factor = 1;
262 if (!parse_unit_factor(end, &factor))
263 return 0;
264 *ret = val * factor;
265 return 1;
266 }
267 return 0;
268}
269int git_parse_ulong(const char *value, unsigned long *ret)
271{
272 if (value && *value) {
273 char *end;
274 unsigned long val = strtoul(value, &end, 0);
275 if (!parse_unit_factor(end, &val))
276 return 0;
277 *ret = val;
278 return 1;
279 }
280 return 0;
281}
282int git_config_int(const char *name, const char *value)
284{
285 long ret;
286 if (!git_parse_long(value, &ret))
287 die("bad config value for '%s' in %s", name, config_file_name);
288 return ret;
289}
290unsigned long git_config_ulong(const char *name, const char *value)
292{
293 unsigned long ret;
294 if (!git_parse_ulong(value, &ret))
295 die("bad config value for '%s' in %s", name, config_file_name);
296 return ret;
297}
298int git_config_bool(const char *name, const char *value)
300{
301 if (!value)
302 return 1;
303 if (!*value)
304 return 0;
305 if (!strcasecmp(value, "true") || !strcasecmp(value, "yes"))
306 return 1;
307 if (!strcasecmp(value, "false") || !strcasecmp(value, "no"))
308 return 0;
309 return git_config_int(name, value) != 0;
310}
311int git_default_config(const char *var, const char *value)
313{
314 /* This needs a better name */
315 if (!strcmp(var, "core.filemode")) {
316 trust_executable_bit = git_config_bool(var, value);
317 return 0;
318 }
319 if (!strcmp(var, "core.quotepath")) {
321 quote_path_fully = git_config_bool(var, value);
322 return 0;
323 }
324 if (!strcmp(var, "core.symlinks")) {
326 has_symlinks = git_config_bool(var, value);
327 return 0;
328 }
329 if (!strcmp(var, "core.bare")) {
331 is_bare_repository_cfg = git_config_bool(var, value);
332 return 0;
333 }
334 if (!strcmp(var, "core.ignorestat")) {
336 assume_unchanged = git_config_bool(var, value);
337 return 0;
338 }
339 if (!strcmp(var, "core.prefersymlinkrefs")) {
341 prefer_symlink_refs = git_config_bool(var, value);
342 return 0;
343 }
344 if (!strcmp(var, "core.logallrefupdates")) {
346 log_all_ref_updates = git_config_bool(var, value);
347 return 0;
348 }
349 if (!strcmp(var, "core.warnambiguousrefs")) {
351 warn_ambiguous_refs = git_config_bool(var, value);
352 return 0;
353 }
354 if (!strcmp(var, "core.loosecompression")) {
356 int level = git_config_int(var, value);
357 if (level == -1)
358 level = Z_DEFAULT_COMPRESSION;
359 else if (level < 0 || level > Z_BEST_COMPRESSION)
360 die("bad zlib compression level %d", level);
361 zlib_compression_level = level;
362 zlib_compression_seen = 1;
363 return 0;
364 }
365 if (!strcmp(var, "core.compression")) {
367 int level = git_config_int(var, value);
368 if (level == -1)
369 level = Z_DEFAULT_COMPRESSION;
370 else if (level < 0 || level > Z_BEST_COMPRESSION)
371 die("bad zlib compression level %d", level);
372 core_compression_level = level;
373 core_compression_seen = 1;
374 if (!zlib_compression_seen)
375 zlib_compression_level = level;
376 return 0;
377 }
378 if (!strcmp(var, "core.packedgitwindowsize")) {
380 int pgsz_x2 = getpagesize() * 2;
381 packed_git_window_size = git_config_int(var, value);
382 /* This value must be multiple of (pagesize * 2) */
384 packed_git_window_size /= pgsz_x2;
385 if (packed_git_window_size < 1)
386 packed_git_window_size = 1;
387 packed_git_window_size *= pgsz_x2;
388 return 0;
389 }
390 if (!strcmp(var, "core.packedgitlimit")) {
392 packed_git_limit = git_config_int(var, value);
393 return 0;
394 }
395 if (!strcmp(var, "core.deltabasecachelimit")) {
397 delta_base_cache_limit = git_config_int(var, value);
398 return 0;
399 }
400 if (!strcmp(var, "core.autocrlf")) {
402 if (value && !strcasecmp(value, "input")) {
403 auto_crlf = -1;
404 return 0;
405 }
406 auto_crlf = git_config_bool(var, value);
407 return 0;
408 }
409 if (!strcmp(var, "user.name")) {
411 strlcpy(git_default_name, value, sizeof(git_default_name));
412 return 0;
413 }
414 if (!strcmp(var, "user.email")) {
416 strlcpy(git_default_email, value, sizeof(git_default_email));
417 return 0;
418 }
419 if (!strcmp(var, "i18n.commitencoding")) {
421 git_commit_encoding = xstrdup(value);
422 return 0;
423 }
424 if (!strcmp(var, "i18n.logoutputencoding")) {
426 git_log_output_encoding = xstrdup(value);
427 return 0;
428 }
429 if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
432 pager_use_color = git_config_bool(var,value);
433 return 0;
434 }
435 if (!strcmp(var, "core.pager")) {
437 pager_program = xstrdup(value);
438 return 0;
439 }
440 if (!strcmp(var, "core.editor")) {
442 editor_program = xstrdup(value);
443 return 0;
444 }
445 if (!strcmp(var, "core.excludesfile")) {
447 if (!value)
448 die("core.excludesfile without value");
449 excludes_file = xstrdup(value);
450 return 0;
451 }
452 if (!strcmp(var, "core.whitespace")) {
454 whitespace_rule_cfg = parse_whitespace_rule(value);
455 return 0;
456 }
457 /* Add other config variables here and to Documentation/config.txt. */
459 return 0;
460}
461int git_config_from_file(config_fn_t fn, const char *filename)
463{
464 int ret;
465 FILE *f = fopen(filename, "r");
466 ret = -1;
468 if (f) {
469 config_file = f;
470 config_file_name = filename;
471 config_linenr = 1;
472 ret = git_parse_file(fn);
473 fclose(f);
474 config_file_name = NULL;
475 }
476 return ret;
477}
478const char *git_etc_gitconfig(void)
480{
481 static const char *system_wide;
482 if (!system_wide) {
483 system_wide = ETC_GITCONFIG;
484 if (!is_absolute_path(system_wide)) {
485 /* interpret path relative to exec-dir */
486 const char *exec_path = git_exec_path();
487 system_wide = prefix_path(exec_path, strlen(exec_path),
488 system_wide);
489 }
490 }
491 return system_wide;
492}
493int git_config(config_fn_t fn)
495{
496 int ret = 0;
497 char *repo_config = NULL;
498 const char *home = NULL, *filename;
499 /* $GIT_CONFIG makes git read _only_ the given config file,
501 * $GIT_CONFIG_LOCAL will make it process it in addition to the
502 * global config file, the same way it would the per-repository
503 * config file otherwise. */
504 filename = getenv(CONFIG_ENVIRONMENT);
505 if (!filename) {
506 if (!access(git_etc_gitconfig(), R_OK))
507 ret += git_config_from_file(fn, git_etc_gitconfig());
508 home = getenv("HOME");
509 filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
510 if (!filename)
511 filename = repo_config = xstrdup(git_path("config"));
512 }
513 if (home) {
515 char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
516 if (!access(user_config, R_OK))
517 ret = git_config_from_file(fn, user_config);
518 free(user_config);
519 }
520 ret += git_config_from_file(fn, filename);
522 free(repo_config);
523 return ret;
524}
525/*
527 * Find all the stuff for git_config_set() below.
528 */
529#define MAX_MATCHES 512
531static struct {
533 int baselen;
534 char* key;
535 int do_not_match;
536 regex_t* value_regex;
537 int multi_replace;
538 size_t offset[MAX_MATCHES];
539 enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
540 int seen;
541} store;
542static int matches(const char* key, const char* value)
544{
545 return !strcmp(key, store.key) &&
546 (store.value_regex == NULL ||
547 (store.do_not_match ^
548 !regexec(store.value_regex, value, 0, NULL, 0)));
549}
550static int store_aux(const char* key, const char* value)
552{
553 const char *ep;
554 size_t section_len;
555 switch (store.state) {
557 case KEY_SEEN:
558 if (matches(key, value)) {
559 if (store.seen == 1 && store.multi_replace == 0) {
560 fprintf(stderr,
561 "Warning: %s has multiple values\n",
562 key);
563 } else if (store.seen >= MAX_MATCHES) {
564 fprintf(stderr, "Too many matches\n");
565 return 1;
566 }
567 store.offset[store.seen] = ftell(config_file);
569 store.seen++;
570 }
571 break;
572 case SECTION_SEEN:
573 /*
574 * What we are looking for is in store.key (both
575 * section and var), and its section part is baselen
576 * long. We found key (again, both section and var).
577 * We would want to know if this key is in the same
578 * section as what we are looking for. We already
579 * know we are in the same section as what should
580 * hold store.key.
581 */
582 ep = strrchr(key, '.');
583 section_len = ep - key;
584 if ((section_len != store.baselen) ||
586 memcmp(key, store.key, section_len+1)) {
587 store.state = SECTION_END_SEEN;
588 break;
589 }
590 /*
592 * Do not increment matches: this is no match, but we
593 * just made sure we are in the desired section.
594 */
595 store.offset[store.seen] = ftell(config_file);
596 /* fallthru */
597 case SECTION_END_SEEN:
598 case START:
599 if (matches(key, value)) {
600 store.offset[store.seen] = ftell(config_file);
601 store.state = KEY_SEEN;
602 store.seen++;
603 } else {
604 if (strrchr(key, '.') - key == store.baselen &&
605 !strncmp(key, store.key, store.baselen)) {
606 store.state = SECTION_SEEN;
607 store.offset[store.seen] = ftell(config_file);
608 }
609 }
610 }
611 return 0;
612}
613static int write_error(void)
615{
616 fprintf(stderr, "Failed to write new configuration file\n");
617 /* Same error code as "failed to rename". */
619 return 4;
620}
621static int store_write_section(int fd, const char* key)
623{
624 const char *dot;
625 int i, success;
626 struct strbuf sb;
627 strbuf_init(&sb, 0);
629 dot = memchr(key, '.', store.baselen);
630 if (dot) {
631 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
632 for (i = dot - key + 1; i < store.baselen; i++) {
633 if (key[i] == '"')
634 strbuf_addch(&sb, '\\');
635 strbuf_addch(&sb, key[i]);
636 }
637 strbuf_addstr(&sb, "\"]\n");
638 } else {
639 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
640 }
641 success = write_in_full(fd, sb.buf, sb.len) == sb.len;
643 strbuf_release(&sb);
644 return success;
646}
647static int store_write_pair(int fd, const char* key, const char* value)
649{
650 int i, success;
651 int length = strlen(key + store.baselen + 1);
652 const char *quote = "";
653 struct strbuf sb;
654 /*
656 * Check to see if the value needs to be surrounded with a dq pair.
657 * Note that problematic characters are always backslash-quoted; this
658 * check is about not losing leading or trailing SP and strings that
659 * follow beginning-of-comment characters (i.e. ';' and '#') by the
660 * configuration parser.
661 */
662 if (value[0] == ' ')
663 quote = "\"";
664 for (i = 0; value[i]; i++)
665 if (value[i] == ';' || value[i] == '#')
666 quote = "\"";
667 if (i && value[i - 1] == ' ')
668 quote = "\"";
669 strbuf_init(&sb, 0);
671 strbuf_addf(&sb, "\t%.*s = %s",
672 length, key + store.baselen + 1, quote);
673 for (i = 0; value[i]; i++)
675 switch (value[i]) {
676 case '\n':
677 strbuf_addstr(&sb, "\\n");
678 break;
679 case '\t':
680 strbuf_addstr(&sb, "\\t");
681 break;
682 case '"':
683 case '\\':
684 strbuf_addch(&sb, '\\');
685 default:
686 strbuf_addch(&sb, value[i]);
687 break;
688 }
689 strbuf_addf(&sb, "%s\n", quote);
690 success = write_in_full(fd, sb.buf, sb.len) == sb.len;
692 strbuf_release(&sb);
693 return success;
695}
696static ssize_t find_beginning_of_line(const char* contents, size_t size,
698 size_t offset_, int* found_bracket)
699{
700 size_t equal_offset = size, bracket_offset = size;
701 ssize_t offset;
702 for (offset = offset_-2; offset > 0
704 && contents[offset] != '\n'; offset--)
705 switch (contents[offset]) {
706 case '=': equal_offset = offset; break;
707 case ']': bracket_offset = offset; break;
708 }
709 if (bracket_offset < equal_offset) {
710 *found_bracket = 1;
711 offset = bracket_offset+1;
712 } else
713 offset++;
714 return offset;
716}
717int git_config_set(const char* key, const char* value)
719{
720 return git_config_set_multivar(key, value, NULL, 0);
721}
722/*
724 * If value==NULL, unset in (remove from) config,
725 * if value_regex!=NULL, disregard key/value pairs where value does not match.
726 * if multi_replace==0, nothing, or only one matching key/value is replaced,
727 * else all matching key/values (regardless how many) are removed,
728 * before the new pair is written.
729 *
730 * Returns 0 on success.
731 *
732 * This function does this:
733 *
734 * - it locks the config file by creating ".git/config.lock"
735 *
736 * - it then parses the config using store_aux() as validator to find
737 * the position on the key/value pair to replace. If it is to be unset,
738 * it must be found exactly once.
739 *
740 * - the config file is mmap()ed and the part before the match (if any) is
741 * written to the lock file, then the changed part and the rest.
742 *
743 * - the config file is removed and the lock file rename()d to it.
744 *
745 */
746int git_config_set_multivar(const char* key, const char* value,
747 const char* value_regex, int multi_replace)
748{
749 int i, dot;
750 int fd = -1, in_fd;
751 int ret;
752 char* config_filename;
753 struct lock_file *lock = NULL;
754 const char* last_dot = strrchr(key, '.');
755 config_filename = getenv(CONFIG_ENVIRONMENT);
757 if (!config_filename) {
758 config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
759 if (!config_filename)
760 config_filename = git_path("config");
761 }
762 config_filename = xstrdup(config_filename);
763 /*
765 * Since "key" actually contains the section name and the real
766 * key name separated by a dot, we have to know where the dot is.
767 */
768 if (last_dot == NULL) {
770 fprintf(stderr, "key does not contain a section: %s\n", key);
771 ret = 2;
772 goto out_free;
773 }
774 store.baselen = last_dot - key;
775 store.multi_replace = multi_replace;
777 /*
779 * Validate the key and while at it, lower case it for matching.
780 */
781 store.key = xmalloc(strlen(key) + 1);
782 dot = 0;
783 for (i = 0; key[i]; i++) {
784 unsigned char c = key[i];
785 if (c == '.')
786 dot = 1;
787 /* Leave the extended basename untouched.. */
788 if (!dot || i > store.baselen) {
789 if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
790 fprintf(stderr, "invalid key: %s\n", key);
791 free(store.key);
792 ret = 1;
793 goto out_free;
794 }
795 c = tolower(c);
796 } else if (c == '\n') {
797 fprintf(stderr, "invalid key (newline): %s\n", key);
798 free(store.key);
799 ret = 1;
800 goto out_free;
801 }
802 store.key[i] = c;
803 }
804 store.key[i] = 0;
805 /*
807 * The lock serves a purpose in addition to locking: the new
808 * contents of .git/config will be written into it.
809 */
810 lock = xcalloc(sizeof(struct lock_file), 1);
811 fd = hold_lock_file_for_update(lock, config_filename, 0);
812 if (fd < 0) {
813 fprintf(stderr, "could not lock config file\n");
814 free(store.key);
815 ret = -1;
816 goto out_free;
817 }
818 /*
820 * If .git/config does not exist yet, write a minimal version.
821 */
822 in_fd = open(config_filename, O_RDONLY);
823 if ( in_fd < 0 ) {
824 free(store.key);
825 if ( ENOENT != errno ) {
827 error("opening %s: %s", config_filename,
828 strerror(errno));
829 ret = 3; /* same as "invalid config file" */
830 goto out_free;
831 }
832 /* if nothing to unset, error out */
833 if (value == NULL) {
834 ret = 5;
835 goto out_free;
836 }
837 store.key = (char*)key;
839 if (!store_write_section(fd, key) ||
840 !store_write_pair(fd, key, value))
841 goto write_err_out;
842 } else {
843 struct stat st;
844 char* contents;
845 size_t contents_sz, copy_begin, copy_end;
846 int i, new_line = 0;
847 if (value_regex == NULL)
849 store.value_regex = NULL;
850 else {
851 if (value_regex[0] == '!') {
852 store.do_not_match = 1;
853 value_regex++;
854 } else
855 store.do_not_match = 0;
856 store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
858 if (regcomp(store.value_regex, value_regex,
859 REG_EXTENDED)) {
860 fprintf(stderr, "Invalid pattern: %s\n",
861 value_regex);
862 free(store.value_regex);
863 ret = 6;
864 goto out_free;
865 }
866 }
867 store.offset[0] = 0;
869 store.state = START;
870 store.seen = 0;
871 /*
873 * After this, store.offset will contain the *end* offset
874 * of the last match, or remain at 0 if no match was found.
875 * As a side effect, we make sure to transform only a valid
876 * existing config file.
877 */
878 if (git_config_from_file(store_aux, config_filename)) {
879 fprintf(stderr, "invalid config file\n");
880 free(store.key);
881 if (store.value_regex != NULL) {
882 regfree(store.value_regex);
883 free(store.value_regex);
884 }
885 ret = 3;
886 goto out_free;
887 }
888 free(store.key);
890 if (store.value_regex != NULL) {
891 regfree(store.value_regex);
892 free(store.value_regex);
893 }
894 /* if nothing to unset, or too many matches, error out */
896 if ((store.seen == 0 && value == NULL) ||
897 (store.seen > 1 && multi_replace == 0)) {
898 ret = 5;
899 goto out_free;
900 }
901 fstat(in_fd, &st);
903 contents_sz = xsize_t(st.st_size);
904 contents = xmmap(NULL, contents_sz, PROT_READ,
905 MAP_PRIVATE, in_fd, 0);
906 close(in_fd);
907 if (store.seen == 0)
909 store.seen = 1;
910 for (i = 0, copy_begin = 0; i < store.seen; i++) {
912 if (store.offset[i] == 0) {
913 store.offset[i] = copy_end = contents_sz;
914 } else if (store.state != KEY_SEEN) {
915 copy_end = store.offset[i];
916 } else
917 copy_end = find_beginning_of_line(
918 contents, contents_sz,
919 store.offset[i]-2, &new_line);
920 /* write the first part of the config */
922 if (copy_end > copy_begin) {
923 if (write_in_full(fd, contents + copy_begin,
924 copy_end - copy_begin) <
925 copy_end - copy_begin)
926 goto write_err_out;
927 if (new_line &&
928 write_in_full(fd, "\n", 1) != 1)
929 goto write_err_out;
930 }
931 copy_begin = store.offset[i];
932 }
933 /* write the pair (value == NULL means unset) */
935 if (value != NULL) {
936 if (store.state == START) {
937 if (!store_write_section(fd, key))
938 goto write_err_out;
939 }
940 if (!store_write_pair(fd, key, value))
941 goto write_err_out;
942 }
943 /* write the rest of the config */
945 if (copy_begin < contents_sz)
946 if (write_in_full(fd, contents + copy_begin,
947 contents_sz - copy_begin) <
948 contents_sz - copy_begin)
949 goto write_err_out;
950 munmap(contents, contents_sz);
952 }
953 if (close(fd) || commit_lock_file(lock) < 0) {
955 fprintf(stderr, "Cannot commit config file!\n");
956 ret = 4;
957 goto out_free;
958 }
959 /* fd is closed, so don't try to close it below. */
961 fd = -1;
962 /*
963 * lock is committed, so don't try to roll it back below.
964 * NOTE: Since lockfile.c keeps a linked list of all created
965 * lock_file structures, it isn't safe to free(lock). It's
966 * better to just leave it hanging around.
967 */
968 lock = NULL;
969 ret = 0;
970out_free:
972 if (0 <= fd)
973 close(fd);
974 if (lock)
975 rollback_lock_file(lock);
976 free(config_filename);
977 return ret;
978write_err_out:
980 ret = write_error();
981 goto out_free;
982}
984static int section_name_match (const char *buf, const char *name)
986{
987 int i = 0, j = 0, dot = 0;
988 for (; buf[i] && buf[i] != ']'; i++) {
989 if (!dot && isspace(buf[i])) {
990 dot = 1;
991 if (name[j++] != '.')
992 break;
993 for (i++; isspace(buf[i]); i++)
994 ; /* do nothing */
995 if (buf[i] != '"')
996 break;
997 continue;
998 }
999 if (buf[i] == '\\' && dot)
1000 i++;
1001 else if (buf[i] == '"' && dot) {
1002 for (i++; isspace(buf[i]); i++)
1003 ; /* do_nothing */
1004 break;
1005 }
1006 if (buf[i] != name[j++])
1007 break;
1008 }
1009 return (buf[i] == ']' && name[j] == 0);
1010}
1011/* if new_name == NULL, the section is removed instead */
1013int git_config_rename_section(const char *old_name, const char *new_name)
1014{
1015 int ret = 0, remove = 0;
1016 char *config_filename;
1017 struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1018 int out_fd;
1019 char buf[1024];
1020 config_filename = getenv(CONFIG_ENVIRONMENT);
1022 if (!config_filename) {
1023 config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
1024 if (!config_filename)
1025 config_filename = git_path("config");
1026 }
1027 config_filename = xstrdup(config_filename);
1028 out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1029 if (out_fd < 0) {
1030 ret = error("Could not lock config file!");
1031 goto out;
1032 }
1033 if (!(config_file = fopen(config_filename, "rb"))) {
1035 /* no config file means nothing to rename, no error */
1036 goto unlock_and_out;
1037 }
1038 while (fgets(buf, sizeof(buf), config_file)) {
1040 int i;
1041 int length;
1042 for (i = 0; buf[i] && isspace(buf[i]); i++)
1043 ; /* do nothing */
1044 if (buf[i] == '[') {
1045 /* it's a section */
1046 if (section_name_match (&buf[i+1], old_name)) {
1047 ret++;
1048 if (new_name == NULL) {
1049 remove = 1;
1050 continue;
1051 }
1052 store.baselen = strlen(new_name);
1053 if (!store_write_section(out_fd, new_name)) {
1054 ret = write_error();
1055 goto out;
1056 }
1057 continue;
1058 }
1059 remove = 0;
1060 }
1061 if (remove)
1062 continue;
1063 length = strlen(buf);
1064 if (write_in_full(out_fd, buf, length) != length) {
1065 ret = write_error();
1066 goto out;
1067 }
1068 }
1069 fclose(config_file);
1070 unlock_and_out:
1071 if (close(out_fd) || commit_lock_file(lock) < 0)
1072 ret = error("Cannot commit config file!");
1073 out:
1074 free(config_filename);
1075 return ret;
1076}