Add "const" qualifier to "char *pager_program".
[git/git.git] / config.c
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
11 #define MAXNAME (256)
12
13 static FILE *config_file;
14 static const char *config_file_name;
15 static int config_linenr;
16 static int config_file_eof;
17 static int zlib_compression_seen;
18
19 static int get_next_char(void)
20 {
21 int c;
22 FILE *f;
23
24 c = '\n';
25 if ((f = config_file) != NULL) {
26 c = fgetc(f);
27 if (c == '\r') {
28 /* DOS like systems */
29 c = fgetc(f);
30 if (c != '\n') {
31 ungetc(c, f);
32 c = '\r';
33 }
34 }
35 if (c == '\n')
36 config_linenr++;
37 if (c == EOF) {
38 config_file_eof = 1;
39 c = '\n';
40 }
41 }
42 return c;
43 }
44
45 static char *parse_value(void)
46 {
47 static char value[1024];
48 int quote = 0, comment = 0, len = 0, space = 0;
49
50 for (;;) {
51 int c = get_next_char();
52 if (len >= sizeof(value))
53 return NULL;
54 if (c == '\n') {
55 if (quote)
56 return NULL;
57 value[len] = 0;
58 return value;
59 }
60 if (comment)
61 continue;
62 if (isspace(c) && !quote) {
63 space = 1;
64 continue;
65 }
66 if (!quote) {
67 if (c == ';' || c == '#') {
68 comment = 1;
69 continue;
70 }
71 }
72 if (space) {
73 if (len)
74 value[len++] = ' ';
75 space = 0;
76 }
77 if (c == '\\') {
78 c = get_next_char();
79 switch (c) {
80 case '\n':
81 continue;
82 case 't':
83 c = '\t';
84 break;
85 case 'b':
86 c = '\b';
87 break;
88 case 'n':
89 c = '\n';
90 break;
91 /* Some characters escape as themselves */
92 case '\\': case '"':
93 break;
94 /* Reject unknown escape sequences */
95 default:
96 return NULL;
97 }
98 value[len++] = c;
99 continue;
100 }
101 if (c == '"') {
102 quote = 1-quote;
103 continue;
104 }
105 value[len++] = c;
106 }
107 }
108
109 static inline int iskeychar(int c)
110 {
111 return isalnum(c) || c == '-';
112 }
113
114 static int get_value(config_fn_t fn, char *name, unsigned int len)
115 {
116 int c;
117 char *value;
118
119 /* Get the full name */
120 for (;;) {
121 c = get_next_char();
122 if (config_file_eof)
123 break;
124 if (!iskeychar(c))
125 break;
126 name[len++] = tolower(c);
127 if (len >= MAXNAME)
128 return -1;
129 }
130 name[len] = 0;
131 while (c == ' ' || c == '\t')
132 c = get_next_char();
133
134 value = NULL;
135 if (c != '\n') {
136 if (c != '=')
137 return -1;
138 value = parse_value();
139 if (!value)
140 return -1;
141 }
142 return fn(name, value);
143 }
144
145 static int get_extended_base_var(char *name, int baselen, int c)
146 {
147 do {
148 if (c == '\n')
149 return -1;
150 c = get_next_char();
151 } while (isspace(c));
152
153 /* We require the format to be '[base "extension"]' */
154 if (c != '"')
155 return -1;
156 name[baselen++] = '.';
157
158 for (;;) {
159 int c = get_next_char();
160 if (c == '\n')
161 return -1;
162 if (c == '"')
163 break;
164 if (c == '\\') {
165 c = get_next_char();
166 if (c == '\n')
167 return -1;
168 }
169 name[baselen++] = c;
170 if (baselen > MAXNAME / 2)
171 return -1;
172 }
173
174 /* Final ']' */
175 if (get_next_char() != ']')
176 return -1;
177 return baselen;
178 }
179
180 static int get_base_var(char *name)
181 {
182 int baselen = 0;
183
184 for (;;) {
185 int c = get_next_char();
186 if (config_file_eof)
187 return -1;
188 if (c == ']')
189 return baselen;
190 if (isspace(c))
191 return get_extended_base_var(name, baselen, c);
192 if (!iskeychar(c) && c != '.')
193 return -1;
194 if (baselen > MAXNAME / 2)
195 return -1;
196 name[baselen++] = tolower(c);
197 }
198 }
199
200 static int git_parse_file(config_fn_t fn)
201 {
202 int comment = 0;
203 int baselen = 0;
204 static char var[MAXNAME];
205
206 for (;;) {
207 int c = get_next_char();
208 if (c == '\n') {
209 if (config_file_eof)
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 }
236
237 static 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 }
255
256 int 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 }
269
270 int 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 }
282
283 int 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 }
290
291 unsigned 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 }
298
299 int 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 }
311
312 int git_config_string(const char **dest, const char *var, const char *value)
313 {
314 if (!value)
315 return config_error_nonbool(var);
316 *dest = xstrdup(value);
317 return 0;
318 }
319
320 int git_default_config(const char *var, const char *value)
321 {
322 /* This needs a better name */
323 if (!strcmp(var, "core.filemode")) {
324 trust_executable_bit = git_config_bool(var, value);
325 return 0;
326 }
327
328 if (!strcmp(var, "core.quotepath")) {
329 quote_path_fully = git_config_bool(var, value);
330 return 0;
331 }
332
333 if (!strcmp(var, "core.symlinks")) {
334 has_symlinks = git_config_bool(var, value);
335 return 0;
336 }
337
338 if (!strcmp(var, "core.bare")) {
339 is_bare_repository_cfg = git_config_bool(var, value);
340 return 0;
341 }
342
343 if (!strcmp(var, "core.ignorestat")) {
344 assume_unchanged = git_config_bool(var, value);
345 return 0;
346 }
347
348 if (!strcmp(var, "core.prefersymlinkrefs")) {
349 prefer_symlink_refs = git_config_bool(var, value);
350 return 0;
351 }
352
353 if (!strcmp(var, "core.logallrefupdates")) {
354 log_all_ref_updates = git_config_bool(var, value);
355 return 0;
356 }
357
358 if (!strcmp(var, "core.warnambiguousrefs")) {
359 warn_ambiguous_refs = git_config_bool(var, value);
360 return 0;
361 }
362
363 if (!strcmp(var, "core.loosecompression")) {
364 int level = git_config_int(var, value);
365 if (level == -1)
366 level = Z_DEFAULT_COMPRESSION;
367 else if (level < 0 || level > Z_BEST_COMPRESSION)
368 die("bad zlib compression level %d", level);
369 zlib_compression_level = level;
370 zlib_compression_seen = 1;
371 return 0;
372 }
373
374 if (!strcmp(var, "core.compression")) {
375 int level = git_config_int(var, value);
376 if (level == -1)
377 level = Z_DEFAULT_COMPRESSION;
378 else if (level < 0 || level > Z_BEST_COMPRESSION)
379 die("bad zlib compression level %d", level);
380 core_compression_level = level;
381 core_compression_seen = 1;
382 if (!zlib_compression_seen)
383 zlib_compression_level = level;
384 return 0;
385 }
386
387 if (!strcmp(var, "core.packedgitwindowsize")) {
388 int pgsz_x2 = getpagesize() * 2;
389 packed_git_window_size = git_config_int(var, value);
390
391 /* This value must be multiple of (pagesize * 2) */
392 packed_git_window_size /= pgsz_x2;
393 if (packed_git_window_size < 1)
394 packed_git_window_size = 1;
395 packed_git_window_size *= pgsz_x2;
396 return 0;
397 }
398
399 if (!strcmp(var, "core.packedgitlimit")) {
400 packed_git_limit = git_config_int(var, value);
401 return 0;
402 }
403
404 if (!strcmp(var, "core.deltabasecachelimit")) {
405 delta_base_cache_limit = git_config_int(var, value);
406 return 0;
407 }
408
409 if (!strcmp(var, "core.autocrlf")) {
410 if (value && !strcasecmp(value, "input")) {
411 auto_crlf = -1;
412 return 0;
413 }
414 auto_crlf = git_config_bool(var, value);
415 return 0;
416 }
417
418 if (!strcmp(var, "user.name")) {
419 if (!value)
420 return config_error_nonbool(var);
421 strlcpy(git_default_name, value, sizeof(git_default_name));
422 return 0;
423 }
424
425 if (!strcmp(var, "user.email")) {
426 if (!value)
427 return config_error_nonbool(var);
428 strlcpy(git_default_email, value, sizeof(git_default_email));
429 return 0;
430 }
431
432 if (!strcmp(var, "i18n.commitencoding"))
433 return git_config_string(&git_commit_encoding, var, value);
434
435 if (!strcmp(var, "i18n.logoutputencoding"))
436 return git_config_string(&git_log_output_encoding, var, value);
437
438 if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
439 pager_use_color = git_config_bool(var,value);
440 return 0;
441 }
442
443 if (!strcmp(var, "core.pager"))
444 return git_config_string(&pager_program, var, value);
445
446 if (!strcmp(var, "core.editor")) {
447 if (!value)
448 return config_error_nonbool(var);
449 editor_program = xstrdup(value);
450 return 0;
451 }
452
453 if (!strcmp(var, "core.excludesfile")) {
454 if (!value)
455 return config_error_nonbool(var);
456 excludes_file = xstrdup(value);
457 return 0;
458 }
459
460 if (!strcmp(var, "core.whitespace")) {
461 if (!value)
462 return config_error_nonbool(var);
463 whitespace_rule_cfg = parse_whitespace_rule(value);
464 return 0;
465 }
466
467 /* Add other config variables here and to Documentation/config.txt. */
468 return 0;
469 }
470
471 int git_config_from_file(config_fn_t fn, const char *filename)
472 {
473 int ret;
474 FILE *f = fopen(filename, "r");
475
476 ret = -1;
477 if (f) {
478 config_file = f;
479 config_file_name = filename;
480 config_linenr = 1;
481 config_file_eof = 0;
482 ret = git_parse_file(fn);
483 fclose(f);
484 config_file_name = NULL;
485 }
486 return ret;
487 }
488
489 const char *git_etc_gitconfig(void)
490 {
491 static const char *system_wide;
492 if (!system_wide) {
493 system_wide = ETC_GITCONFIG;
494 if (!is_absolute_path(system_wide)) {
495 /* interpret path relative to exec-dir */
496 const char *exec_path = git_exec_path();
497 system_wide = prefix_path(exec_path, strlen(exec_path),
498 system_wide);
499 }
500 }
501 return system_wide;
502 }
503
504 int git_config(config_fn_t fn)
505 {
506 int ret = 0;
507 char *repo_config = NULL;
508 const char *home = NULL, *filename;
509
510 /* $GIT_CONFIG makes git read _only_ the given config file,
511 * $GIT_CONFIG_LOCAL will make it process it in addition to the
512 * global config file, the same way it would the per-repository
513 * config file otherwise. */
514 filename = getenv(CONFIG_ENVIRONMENT);
515 if (!filename) {
516 if (!access(git_etc_gitconfig(), R_OK))
517 ret += git_config_from_file(fn, git_etc_gitconfig());
518 home = getenv("HOME");
519 filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
520 if (!filename)
521 filename = repo_config = xstrdup(git_path("config"));
522 }
523
524 if (home) {
525 char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
526 if (!access(user_config, R_OK))
527 ret = git_config_from_file(fn, user_config);
528 free(user_config);
529 }
530
531 ret += git_config_from_file(fn, filename);
532 free(repo_config);
533 return ret;
534 }
535
536 /*
537 * Find all the stuff for git_config_set() below.
538 */
539
540 #define MAX_MATCHES 512
541
542 static struct {
543 int baselen;
544 char* key;
545 int do_not_match;
546 regex_t* value_regex;
547 int multi_replace;
548 size_t offset[MAX_MATCHES];
549 enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
550 int seen;
551 } store;
552
553 static int matches(const char* key, const char* value)
554 {
555 return !strcmp(key, store.key) &&
556 (store.value_regex == NULL ||
557 (store.do_not_match ^
558 !regexec(store.value_regex, value, 0, NULL, 0)));
559 }
560
561 static int store_aux(const char* key, const char* value)
562 {
563 const char *ep;
564 size_t section_len;
565
566 switch (store.state) {
567 case KEY_SEEN:
568 if (matches(key, value)) {
569 if (store.seen == 1 && store.multi_replace == 0) {
570 fprintf(stderr,
571 "Warning: %s has multiple values\n",
572 key);
573 } else if (store.seen >= MAX_MATCHES) {
574 fprintf(stderr, "Too many matches\n");
575 return 1;
576 }
577
578 store.offset[store.seen] = ftell(config_file);
579 store.seen++;
580 }
581 break;
582 case SECTION_SEEN:
583 /*
584 * What we are looking for is in store.key (both
585 * section and var), and its section part is baselen
586 * long. We found key (again, both section and var).
587 * We would want to know if this key is in the same
588 * section as what we are looking for. We already
589 * know we are in the same section as what should
590 * hold store.key.
591 */
592 ep = strrchr(key, '.');
593 section_len = ep - key;
594
595 if ((section_len != store.baselen) ||
596 memcmp(key, store.key, section_len+1)) {
597 store.state = SECTION_END_SEEN;
598 break;
599 }
600
601 /*
602 * Do not increment matches: this is no match, but we
603 * just made sure we are in the desired section.
604 */
605 store.offset[store.seen] = ftell(config_file);
606 /* fallthru */
607 case SECTION_END_SEEN:
608 case START:
609 if (matches(key, value)) {
610 store.offset[store.seen] = ftell(config_file);
611 store.state = KEY_SEEN;
612 store.seen++;
613 } else {
614 if (strrchr(key, '.') - key == store.baselen &&
615 !strncmp(key, store.key, store.baselen)) {
616 store.state = SECTION_SEEN;
617 store.offset[store.seen] = ftell(config_file);
618 }
619 }
620 }
621 return 0;
622 }
623
624 static int write_error(void)
625 {
626 fprintf(stderr, "Failed to write new configuration file\n");
627
628 /* Same error code as "failed to rename". */
629 return 4;
630 }
631
632 static int store_write_section(int fd, const char* key)
633 {
634 const char *dot;
635 int i, success;
636 struct strbuf sb;
637
638 strbuf_init(&sb, 0);
639 dot = memchr(key, '.', store.baselen);
640 if (dot) {
641 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
642 for (i = dot - key + 1; i < store.baselen; i++) {
643 if (key[i] == '"')
644 strbuf_addch(&sb, '\\');
645 strbuf_addch(&sb, key[i]);
646 }
647 strbuf_addstr(&sb, "\"]\n");
648 } else {
649 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
650 }
651
652 success = write_in_full(fd, sb.buf, sb.len) == sb.len;
653 strbuf_release(&sb);
654
655 return success;
656 }
657
658 static int store_write_pair(int fd, const char* key, const char* value)
659 {
660 int i, success;
661 int length = strlen(key + store.baselen + 1);
662 const char *quote = "";
663 struct strbuf sb;
664
665 /*
666 * Check to see if the value needs to be surrounded with a dq pair.
667 * Note that problematic characters are always backslash-quoted; this
668 * check is about not losing leading or trailing SP and strings that
669 * follow beginning-of-comment characters (i.e. ';' and '#') by the
670 * configuration parser.
671 */
672 if (value[0] == ' ')
673 quote = "\"";
674 for (i = 0; value[i]; i++)
675 if (value[i] == ';' || value[i] == '#')
676 quote = "\"";
677 if (i && value[i - 1] == ' ')
678 quote = "\"";
679
680 strbuf_init(&sb, 0);
681 strbuf_addf(&sb, "\t%.*s = %s",
682 length, key + store.baselen + 1, quote);
683
684 for (i = 0; value[i]; i++)
685 switch (value[i]) {
686 case '\n':
687 strbuf_addstr(&sb, "\\n");
688 break;
689 case '\t':
690 strbuf_addstr(&sb, "\\t");
691 break;
692 case '"':
693 case '\\':
694 strbuf_addch(&sb, '\\');
695 default:
696 strbuf_addch(&sb, value[i]);
697 break;
698 }
699 strbuf_addf(&sb, "%s\n", quote);
700
701 success = write_in_full(fd, sb.buf, sb.len) == sb.len;
702 strbuf_release(&sb);
703
704 return success;
705 }
706
707 static ssize_t find_beginning_of_line(const char* contents, size_t size,
708 size_t offset_, int* found_bracket)
709 {
710 size_t equal_offset = size, bracket_offset = size;
711 ssize_t offset;
712
713 contline:
714 for (offset = offset_-2; offset > 0
715 && contents[offset] != '\n'; offset--)
716 switch (contents[offset]) {
717 case '=': equal_offset = offset; break;
718 case ']': bracket_offset = offset; break;
719 }
720 if (offset > 0 && contents[offset-1] == '\\') {
721 offset_ = offset;
722 goto contline;
723 }
724 if (bracket_offset < equal_offset) {
725 *found_bracket = 1;
726 offset = bracket_offset+1;
727 } else
728 offset++;
729
730 return offset;
731 }
732
733 int git_config_set(const char* key, const char* value)
734 {
735 return git_config_set_multivar(key, value, NULL, 0);
736 }
737
738 /*
739 * If value==NULL, unset in (remove from) config,
740 * if value_regex!=NULL, disregard key/value pairs where value does not match.
741 * if multi_replace==0, nothing, or only one matching key/value is replaced,
742 * else all matching key/values (regardless how many) are removed,
743 * before the new pair is written.
744 *
745 * Returns 0 on success.
746 *
747 * This function does this:
748 *
749 * - it locks the config file by creating ".git/config.lock"
750 *
751 * - it then parses the config using store_aux() as validator to find
752 * the position on the key/value pair to replace. If it is to be unset,
753 * it must be found exactly once.
754 *
755 * - the config file is mmap()ed and the part before the match (if any) is
756 * written to the lock file, then the changed part and the rest.
757 *
758 * - the config file is removed and the lock file rename()d to it.
759 *
760 */
761 int git_config_set_multivar(const char* key, const char* value,
762 const char* value_regex, int multi_replace)
763 {
764 int i, dot;
765 int fd = -1, in_fd;
766 int ret;
767 char* config_filename;
768 struct lock_file *lock = NULL;
769 const char* last_dot = strrchr(key, '.');
770
771 config_filename = getenv(CONFIG_ENVIRONMENT);
772 if (!config_filename) {
773 config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
774 if (!config_filename)
775 config_filename = git_path("config");
776 }
777 config_filename = xstrdup(config_filename);
778
779 /*
780 * Since "key" actually contains the section name and the real
781 * key name separated by a dot, we have to know where the dot is.
782 */
783
784 if (last_dot == NULL) {
785 fprintf(stderr, "key does not contain a section: %s\n", key);
786 ret = 2;
787 goto out_free;
788 }
789 store.baselen = last_dot - key;
790
791 store.multi_replace = multi_replace;
792
793 /*
794 * Validate the key and while at it, lower case it for matching.
795 */
796 store.key = xmalloc(strlen(key) + 1);
797 dot = 0;
798 for (i = 0; key[i]; i++) {
799 unsigned char c = key[i];
800 if (c == '.')
801 dot = 1;
802 /* Leave the extended basename untouched.. */
803 if (!dot || i > store.baselen) {
804 if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
805 fprintf(stderr, "invalid key: %s\n", key);
806 free(store.key);
807 ret = 1;
808 goto out_free;
809 }
810 c = tolower(c);
811 } else if (c == '\n') {
812 fprintf(stderr, "invalid key (newline): %s\n", key);
813 free(store.key);
814 ret = 1;
815 goto out_free;
816 }
817 store.key[i] = c;
818 }
819 store.key[i] = 0;
820
821 /*
822 * The lock serves a purpose in addition to locking: the new
823 * contents of .git/config will be written into it.
824 */
825 lock = xcalloc(sizeof(struct lock_file), 1);
826 fd = hold_lock_file_for_update(lock, config_filename, 0);
827 if (fd < 0) {
828 fprintf(stderr, "could not lock config file\n");
829 free(store.key);
830 ret = -1;
831 goto out_free;
832 }
833
834 /*
835 * If .git/config does not exist yet, write a minimal version.
836 */
837 in_fd = open(config_filename, O_RDONLY);
838 if ( in_fd < 0 ) {
839 free(store.key);
840
841 if ( ENOENT != errno ) {
842 error("opening %s: %s", config_filename,
843 strerror(errno));
844 ret = 3; /* same as "invalid config file" */
845 goto out_free;
846 }
847 /* if nothing to unset, error out */
848 if (value == NULL) {
849 ret = 5;
850 goto out_free;
851 }
852
853 store.key = (char*)key;
854 if (!store_write_section(fd, key) ||
855 !store_write_pair(fd, key, value))
856 goto write_err_out;
857 } else {
858 struct stat st;
859 char* contents;
860 size_t contents_sz, copy_begin, copy_end;
861 int i, new_line = 0;
862
863 if (value_regex == NULL)
864 store.value_regex = NULL;
865 else {
866 if (value_regex[0] == '!') {
867 store.do_not_match = 1;
868 value_regex++;
869 } else
870 store.do_not_match = 0;
871
872 store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
873 if (regcomp(store.value_regex, value_regex,
874 REG_EXTENDED)) {
875 fprintf(stderr, "Invalid pattern: %s\n",
876 value_regex);
877 free(store.value_regex);
878 ret = 6;
879 goto out_free;
880 }
881 }
882
883 store.offset[0] = 0;
884 store.state = START;
885 store.seen = 0;
886
887 /*
888 * After this, store.offset will contain the *end* offset
889 * of the last match, or remain at 0 if no match was found.
890 * As a side effect, we make sure to transform only a valid
891 * existing config file.
892 */
893 if (git_config_from_file(store_aux, config_filename)) {
894 fprintf(stderr, "invalid config file\n");
895 free(store.key);
896 if (store.value_regex != NULL) {
897 regfree(store.value_regex);
898 free(store.value_regex);
899 }
900 ret = 3;
901 goto out_free;
902 }
903
904 free(store.key);
905 if (store.value_regex != NULL) {
906 regfree(store.value_regex);
907 free(store.value_regex);
908 }
909
910 /* if nothing to unset, or too many matches, error out */
911 if ((store.seen == 0 && value == NULL) ||
912 (store.seen > 1 && multi_replace == 0)) {
913 ret = 5;
914 goto out_free;
915 }
916
917 fstat(in_fd, &st);
918 contents_sz = xsize_t(st.st_size);
919 contents = xmmap(NULL, contents_sz, PROT_READ,
920 MAP_PRIVATE, in_fd, 0);
921 close(in_fd);
922
923 if (store.seen == 0)
924 store.seen = 1;
925
926 for (i = 0, copy_begin = 0; i < store.seen; i++) {
927 if (store.offset[i] == 0) {
928 store.offset[i] = copy_end = contents_sz;
929 } else if (store.state != KEY_SEEN) {
930 copy_end = store.offset[i];
931 } else
932 copy_end = find_beginning_of_line(
933 contents, contents_sz,
934 store.offset[i]-2, &new_line);
935
936 if (copy_end > 0 && contents[copy_end-1] != '\n')
937 new_line = 1;
938
939 /* write the first part of the config */
940 if (copy_end > copy_begin) {
941 if (write_in_full(fd, contents + copy_begin,
942 copy_end - copy_begin) <
943 copy_end - copy_begin)
944 goto write_err_out;
945 if (new_line &&
946 write_in_full(fd, "\n", 1) != 1)
947 goto write_err_out;
948 }
949 copy_begin = store.offset[i];
950 }
951
952 /* write the pair (value == NULL means unset) */
953 if (value != NULL) {
954 if (store.state == START) {
955 if (!store_write_section(fd, key))
956 goto write_err_out;
957 }
958 if (!store_write_pair(fd, key, value))
959 goto write_err_out;
960 }
961
962 /* write the rest of the config */
963 if (copy_begin < contents_sz)
964 if (write_in_full(fd, contents + copy_begin,
965 contents_sz - copy_begin) <
966 contents_sz - copy_begin)
967 goto write_err_out;
968
969 munmap(contents, contents_sz);
970 }
971
972 if (commit_lock_file(lock) < 0) {
973 fprintf(stderr, "Cannot commit config file!\n");
974 ret = 4;
975 goto out_free;
976 }
977
978 /*
979 * lock is committed, so don't try to roll it back below.
980 * NOTE: Since lockfile.c keeps a linked list of all created
981 * lock_file structures, it isn't safe to free(lock). It's
982 * better to just leave it hanging around.
983 */
984 lock = NULL;
985 ret = 0;
986
987 out_free:
988 if (lock)
989 rollback_lock_file(lock);
990 free(config_filename);
991 return ret;
992
993 write_err_out:
994 ret = write_error();
995 goto out_free;
996
997 }
998
999 static int section_name_match (const char *buf, const char *name)
1000 {
1001 int i = 0, j = 0, dot = 0;
1002 for (; buf[i] && buf[i] != ']'; i++) {
1003 if (!dot && isspace(buf[i])) {
1004 dot = 1;
1005 if (name[j++] != '.')
1006 break;
1007 for (i++; isspace(buf[i]); i++)
1008 ; /* do nothing */
1009 if (buf[i] != '"')
1010 break;
1011 continue;
1012 }
1013 if (buf[i] == '\\' && dot)
1014 i++;
1015 else if (buf[i] == '"' && dot) {
1016 for (i++; isspace(buf[i]); i++)
1017 ; /* do_nothing */
1018 break;
1019 }
1020 if (buf[i] != name[j++])
1021 break;
1022 }
1023 return (buf[i] == ']' && name[j] == 0);
1024 }
1025
1026 /* if new_name == NULL, the section is removed instead */
1027 int git_config_rename_section(const char *old_name, const char *new_name)
1028 {
1029 int ret = 0, remove = 0;
1030 char *config_filename;
1031 struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1032 int out_fd;
1033 char buf[1024];
1034
1035 config_filename = getenv(CONFIG_ENVIRONMENT);
1036 if (!config_filename) {
1037 config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
1038 if (!config_filename)
1039 config_filename = git_path("config");
1040 }
1041 config_filename = xstrdup(config_filename);
1042 out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1043 if (out_fd < 0) {
1044 ret = error("Could not lock config file!");
1045 goto out;
1046 }
1047
1048 if (!(config_file = fopen(config_filename, "rb"))) {
1049 /* no config file means nothing to rename, no error */
1050 goto unlock_and_out;
1051 }
1052
1053 while (fgets(buf, sizeof(buf), config_file)) {
1054 int i;
1055 int length;
1056 for (i = 0; buf[i] && isspace(buf[i]); i++)
1057 ; /* do nothing */
1058 if (buf[i] == '[') {
1059 /* it's a section */
1060 if (section_name_match (&buf[i+1], old_name)) {
1061 ret++;
1062 if (new_name == NULL) {
1063 remove = 1;
1064 continue;
1065 }
1066 store.baselen = strlen(new_name);
1067 if (!store_write_section(out_fd, new_name)) {
1068 ret = write_error();
1069 goto out;
1070 }
1071 continue;
1072 }
1073 remove = 0;
1074 }
1075 if (remove)
1076 continue;
1077 length = strlen(buf);
1078 if (write_in_full(out_fd, buf, length) != length) {
1079 ret = write_error();
1080 goto out;
1081 }
1082 }
1083 fclose(config_file);
1084 unlock_and_out:
1085 if (commit_lock_file(lock) < 0)
1086 ret = error("Cannot commit config file!");
1087 out:
1088 free(config_filename);
1089 return ret;
1090 }
1091
1092 /*
1093 * Call this to report error for your variable that should not
1094 * get a boolean value (i.e. "[my] var" means "true").
1095 */
1096 int config_error_nonbool(const char *var)
1097 {
1098 return error("Missing value for '%s'", var);
1099 }