703c2085a5d7745c06633e534e445926dfdc3185
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 config_file_eof;
17static int zlib_compression_seen;
18static int get_next_char(void)
20{
21 int c;
22 FILE *f;
23 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}
44static char *parse_value(void)
46{
47 static char value[1024];
48 int quote = 0, comment = 0, len = 0, space = 0;
49 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}
108static inline int iskeychar(int c)
110{
111 return isalnum(c) || c == '-';
112}
113static int get_value(config_fn_t fn, char *name, unsigned int len)
115{
116 int c;
117 char *value;
118 /* 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 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}
144static 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 /* We require the format to be '[base "extension"]' */
154 if (c != '"')
155 return -1;
156 name[baselen++] = '.';
157 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 /* Final ']' */
175 if (get_next_char() != ']')
176 return -1;
177 return baselen;
178}
179static int get_base_var(char *name)
181{
182 int baselen = 0;
183 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}
199static int git_parse_file(config_fn_t fn)
201{
202 int comment = 0;
203 int baselen = 0;
204 static char var[MAXNAME];
205 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}
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_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}
319int 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 if (!strcmp(var, "core.quotepath")) {
329 quote_path_fully = git_config_bool(var, value);
330 return 0;
331 }
332 if (!strcmp(var, "core.symlinks")) {
334 has_symlinks = git_config_bool(var, value);
335 return 0;
336 }
337 if (!strcmp(var, "core.bare")) {
339 is_bare_repository_cfg = git_config_bool(var, value);
340 return 0;
341 }
342 if (!strcmp(var, "core.ignorestat")) {
344 assume_unchanged = git_config_bool(var, value);
345 return 0;
346 }
347 if (!strcmp(var, "core.prefersymlinkrefs")) {
349 prefer_symlink_refs = git_config_bool(var, value);
350 return 0;
351 }
352 if (!strcmp(var, "core.logallrefupdates")) {
354 log_all_ref_updates = git_config_bool(var, value);
355 return 0;
356 }
357 if (!strcmp(var, "core.warnambiguousrefs")) {
359 warn_ambiguous_refs = git_config_bool(var, value);
360 return 0;
361 }
362 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 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 if (!strcmp(var, "core.packedgitwindowsize")) {
388 int pgsz_x2 = getpagesize() * 2;
389 packed_git_window_size = git_config_int(var, value);
390 /* 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 if (!strcmp(var, "core.packedgitlimit")) {
400 packed_git_limit = git_config_int(var, value);
401 return 0;
402 }
403 if (!strcmp(var, "core.deltabasecachelimit")) {
405 delta_base_cache_limit = git_config_int(var, value);
406 return 0;
407 }
408 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 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 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 if (!strcmp(var, "i18n.commitencoding"))
433 return git_config_string(&git_commit_encoding, var, value);
434 if (!strcmp(var, "i18n.logoutputencoding"))
436 return git_config_string(&git_log_output_encoding, var, value);
437 if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
439 pager_use_color = git_config_bool(var,value);
440 return 0;
441 }
442 if (!strcmp(var, "core.pager"))
444 return git_config_string(&pager_program, var, value);
445 if (!strcmp(var, "core.editor"))
447 return git_config_string(&editor_program, var, value);
448 if (!strcmp(var, "core.excludesfile")) {
450 if (!value)
451 return config_error_nonbool(var);
452 excludes_file = xstrdup(value);
453 return 0;
454 }
455 if (!strcmp(var, "core.whitespace")) {
457 if (!value)
458 return config_error_nonbool(var);
459 whitespace_rule_cfg = parse_whitespace_rule(value);
460 return 0;
461 }
462 /* Add other config variables here and to Documentation/config.txt. */
464 return 0;
465}
466int git_config_from_file(config_fn_t fn, const char *filename)
468{
469 int ret;
470 FILE *f = fopen(filename, "r");
471 ret = -1;
473 if (f) {
474 config_file = f;
475 config_file_name = filename;
476 config_linenr = 1;
477 config_file_eof = 0;
478 ret = git_parse_file(fn);
479 fclose(f);
480 config_file_name = NULL;
481 }
482 return ret;
483}
484const char *git_etc_gitconfig(void)
486{
487 static const char *system_wide;
488 if (!system_wide) {
489 system_wide = ETC_GITCONFIG;
490 if (!is_absolute_path(system_wide)) {
491 /* interpret path relative to exec-dir */
492 const char *exec_path = git_exec_path();
493 system_wide = prefix_path(exec_path, strlen(exec_path),
494 system_wide);
495 }
496 }
497 return system_wide;
498}
499int git_config(config_fn_t fn)
501{
502 int ret = 0;
503 char *repo_config = NULL;
504 const char *home = NULL, *filename;
505 /* $GIT_CONFIG makes git read _only_ the given config file,
507 * $GIT_CONFIG_LOCAL will make it process it in addition to the
508 * global config file, the same way it would the per-repository
509 * config file otherwise. */
510 filename = getenv(CONFIG_ENVIRONMENT);
511 if (!filename) {
512 if (!access(git_etc_gitconfig(), R_OK))
513 ret += git_config_from_file(fn, git_etc_gitconfig());
514 home = getenv("HOME");
515 filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
516 if (!filename)
517 filename = repo_config = xstrdup(git_path("config"));
518 }
519 if (home) {
521 char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
522 if (!access(user_config, R_OK))
523 ret = git_config_from_file(fn, user_config);
524 free(user_config);
525 }
526 ret += git_config_from_file(fn, filename);
528 free(repo_config);
529 return ret;
530}
531/*
533 * Find all the stuff for git_config_set() below.
534 */
535#define MAX_MATCHES 512
537static struct {
539 int baselen;
540 char* key;
541 int do_not_match;
542 regex_t* value_regex;
543 int multi_replace;
544 size_t offset[MAX_MATCHES];
545 enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
546 int seen;
547} store;
548static int matches(const char* key, const char* value)
550{
551 return !strcmp(key, store.key) &&
552 (store.value_regex == NULL ||
553 (store.do_not_match ^
554 !regexec(store.value_regex, value, 0, NULL, 0)));
555}
556static int store_aux(const char* key, const char* value)
558{
559 const char *ep;
560 size_t section_len;
561 switch (store.state) {
563 case KEY_SEEN:
564 if (matches(key, value)) {
565 if (store.seen == 1 && store.multi_replace == 0) {
566 fprintf(stderr,
567 "Warning: %s has multiple values\n",
568 key);
569 } else if (store.seen >= MAX_MATCHES) {
570 fprintf(stderr, "Too many matches\n");
571 return 1;
572 }
573 store.offset[store.seen] = ftell(config_file);
575 store.seen++;
576 }
577 break;
578 case SECTION_SEEN:
579 /*
580 * What we are looking for is in store.key (both
581 * section and var), and its section part is baselen
582 * long. We found key (again, both section and var).
583 * We would want to know if this key is in the same
584 * section as what we are looking for. We already
585 * know we are in the same section as what should
586 * hold store.key.
587 */
588 ep = strrchr(key, '.');
589 section_len = ep - key;
590 if ((section_len != store.baselen) ||
592 memcmp(key, store.key, section_len+1)) {
593 store.state = SECTION_END_SEEN;
594 break;
595 }
596 /*
598 * Do not increment matches: this is no match, but we
599 * just made sure we are in the desired section.
600 */
601 store.offset[store.seen] = ftell(config_file);
602 /* fallthru */
603 case SECTION_END_SEEN:
604 case START:
605 if (matches(key, value)) {
606 store.offset[store.seen] = ftell(config_file);
607 store.state = KEY_SEEN;
608 store.seen++;
609 } else {
610 if (strrchr(key, '.') - key == store.baselen &&
611 !strncmp(key, store.key, store.baselen)) {
612 store.state = SECTION_SEEN;
613 store.offset[store.seen] = ftell(config_file);
614 }
615 }
616 }
617 return 0;
618}
619static int write_error(void)
621{
622 fprintf(stderr, "Failed to write new configuration file\n");
623 /* Same error code as "failed to rename". */
625 return 4;
626}
627static int store_write_section(int fd, const char* key)
629{
630 const char *dot;
631 int i, success;
632 struct strbuf sb;
633 strbuf_init(&sb, 0);
635 dot = memchr(key, '.', store.baselen);
636 if (dot) {
637 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
638 for (i = dot - key + 1; i < store.baselen; i++) {
639 if (key[i] == '"')
640 strbuf_addch(&sb, '\\');
641 strbuf_addch(&sb, key[i]);
642 }
643 strbuf_addstr(&sb, "\"]\n");
644 } else {
645 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
646 }
647 success = write_in_full(fd, sb.buf, sb.len) == sb.len;
649 strbuf_release(&sb);
650 return success;
652}
653static int store_write_pair(int fd, const char* key, const char* value)
655{
656 int i, success;
657 int length = strlen(key + store.baselen + 1);
658 const char *quote = "";
659 struct strbuf sb;
660 /*
662 * Check to see if the value needs to be surrounded with a dq pair.
663 * Note that problematic characters are always backslash-quoted; this
664 * check is about not losing leading or trailing SP and strings that
665 * follow beginning-of-comment characters (i.e. ';' and '#') by the
666 * configuration parser.
667 */
668 if (value[0] == ' ')
669 quote = "\"";
670 for (i = 0; value[i]; i++)
671 if (value[i] == ';' || value[i] == '#')
672 quote = "\"";
673 if (i && value[i - 1] == ' ')
674 quote = "\"";
675 strbuf_init(&sb, 0);
677 strbuf_addf(&sb, "\t%.*s = %s",
678 length, key + store.baselen + 1, quote);
679 for (i = 0; value[i]; i++)
681 switch (value[i]) {
682 case '\n':
683 strbuf_addstr(&sb, "\\n");
684 break;
685 case '\t':
686 strbuf_addstr(&sb, "\\t");
687 break;
688 case '"':
689 case '\\':
690 strbuf_addch(&sb, '\\');
691 default:
692 strbuf_addch(&sb, value[i]);
693 break;
694 }
695 strbuf_addf(&sb, "%s\n", quote);
696 success = write_in_full(fd, sb.buf, sb.len) == sb.len;
698 strbuf_release(&sb);
699 return success;
701}
702static ssize_t find_beginning_of_line(const char* contents, size_t size,
704 size_t offset_, int* found_bracket)
705{
706 size_t equal_offset = size, bracket_offset = size;
707 ssize_t offset;
708contline:
710 for (offset = offset_-2; offset > 0
711 && contents[offset] != '\n'; offset--)
712 switch (contents[offset]) {
713 case '=': equal_offset = offset; break;
714 case ']': bracket_offset = offset; break;
715 }
716 if (offset > 0 && contents[offset-1] == '\\') {
717 offset_ = offset;
718 goto contline;
719 }
720 if (bracket_offset < equal_offset) {
721 *found_bracket = 1;
722 offset = bracket_offset+1;
723 } else
724 offset++;
725 return offset;
727}
728int git_config_set(const char* key, const char* value)
730{
731 return git_config_set_multivar(key, value, NULL, 0);
732}
733/*
735 * If value==NULL, unset in (remove from) config,
736 * if value_regex!=NULL, disregard key/value pairs where value does not match.
737 * if multi_replace==0, nothing, or only one matching key/value is replaced,
738 * else all matching key/values (regardless how many) are removed,
739 * before the new pair is written.
740 *
741 * Returns 0 on success.
742 *
743 * This function does this:
744 *
745 * - it locks the config file by creating ".git/config.lock"
746 *
747 * - it then parses the config using store_aux() as validator to find
748 * the position on the key/value pair to replace. If it is to be unset,
749 * it must be found exactly once.
750 *
751 * - the config file is mmap()ed and the part before the match (if any) is
752 * written to the lock file, then the changed part and the rest.
753 *
754 * - the config file is removed and the lock file rename()d to it.
755 *
756 */
757int git_config_set_multivar(const char* key, const char* value,
758 const char* value_regex, int multi_replace)
759{
760 int i, dot;
761 int fd = -1, in_fd;
762 int ret;
763 char* config_filename;
764 struct lock_file *lock = NULL;
765 const char* last_dot = strrchr(key, '.');
766 config_filename = getenv(CONFIG_ENVIRONMENT);
768 if (!config_filename) {
769 config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
770 if (!config_filename)
771 config_filename = git_path("config");
772 }
773 config_filename = xstrdup(config_filename);
774 /*
776 * Since "key" actually contains the section name and the real
777 * key name separated by a dot, we have to know where the dot is.
778 */
779 if (last_dot == NULL) {
781 fprintf(stderr, "key does not contain a section: %s\n", key);
782 ret = 2;
783 goto out_free;
784 }
785 store.baselen = last_dot - key;
786 store.multi_replace = multi_replace;
788 /*
790 * Validate the key and while at it, lower case it for matching.
791 */
792 store.key = xmalloc(strlen(key) + 1);
793 dot = 0;
794 for (i = 0; key[i]; i++) {
795 unsigned char c = key[i];
796 if (c == '.')
797 dot = 1;
798 /* Leave the extended basename untouched.. */
799 if (!dot || i > store.baselen) {
800 if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
801 fprintf(stderr, "invalid key: %s\n", key);
802 free(store.key);
803 ret = 1;
804 goto out_free;
805 }
806 c = tolower(c);
807 } else if (c == '\n') {
808 fprintf(stderr, "invalid key (newline): %s\n", key);
809 free(store.key);
810 ret = 1;
811 goto out_free;
812 }
813 store.key[i] = c;
814 }
815 store.key[i] = 0;
816 /*
818 * The lock serves a purpose in addition to locking: the new
819 * contents of .git/config will be written into it.
820 */
821 lock = xcalloc(sizeof(struct lock_file), 1);
822 fd = hold_lock_file_for_update(lock, config_filename, 0);
823 if (fd < 0) {
824 fprintf(stderr, "could not lock config file\n");
825 free(store.key);
826 ret = -1;
827 goto out_free;
828 }
829 /*
831 * If .git/config does not exist yet, write a minimal version.
832 */
833 in_fd = open(config_filename, O_RDONLY);
834 if ( in_fd < 0 ) {
835 free(store.key);
836 if ( ENOENT != errno ) {
838 error("opening %s: %s", config_filename,
839 strerror(errno));
840 ret = 3; /* same as "invalid config file" */
841 goto out_free;
842 }
843 /* if nothing to unset, error out */
844 if (value == NULL) {
845 ret = 5;
846 goto out_free;
847 }
848 store.key = (char*)key;
850 if (!store_write_section(fd, key) ||
851 !store_write_pair(fd, key, value))
852 goto write_err_out;
853 } else {
854 struct stat st;
855 char* contents;
856 size_t contents_sz, copy_begin, copy_end;
857 int i, new_line = 0;
858 if (value_regex == NULL)
860 store.value_regex = NULL;
861 else {
862 if (value_regex[0] == '!') {
863 store.do_not_match = 1;
864 value_regex++;
865 } else
866 store.do_not_match = 0;
867 store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
869 if (regcomp(store.value_regex, value_regex,
870 REG_EXTENDED)) {
871 fprintf(stderr, "Invalid pattern: %s\n",
872 value_regex);
873 free(store.value_regex);
874 ret = 6;
875 goto out_free;
876 }
877 }
878 store.offset[0] = 0;
880 store.state = START;
881 store.seen = 0;
882 /*
884 * After this, store.offset will contain the *end* offset
885 * of the last match, or remain at 0 if no match was found.
886 * As a side effect, we make sure to transform only a valid
887 * existing config file.
888 */
889 if (git_config_from_file(store_aux, config_filename)) {
890 fprintf(stderr, "invalid config file\n");
891 free(store.key);
892 if (store.value_regex != NULL) {
893 regfree(store.value_regex);
894 free(store.value_regex);
895 }
896 ret = 3;
897 goto out_free;
898 }
899 free(store.key);
901 if (store.value_regex != NULL) {
902 regfree(store.value_regex);
903 free(store.value_regex);
904 }
905 /* if nothing to unset, or too many matches, error out */
907 if ((store.seen == 0 && value == NULL) ||
908 (store.seen > 1 && multi_replace == 0)) {
909 ret = 5;
910 goto out_free;
911 }
912 fstat(in_fd, &st);
914 contents_sz = xsize_t(st.st_size);
915 contents = xmmap(NULL, contents_sz, PROT_READ,
916 MAP_PRIVATE, in_fd, 0);
917 close(in_fd);
918 if (store.seen == 0)
920 store.seen = 1;
921 for (i = 0, copy_begin = 0; i < store.seen; i++) {
923 if (store.offset[i] == 0) {
924 store.offset[i] = copy_end = contents_sz;
925 } else if (store.state != KEY_SEEN) {
926 copy_end = store.offset[i];
927 } else
928 copy_end = find_beginning_of_line(
929 contents, contents_sz,
930 store.offset[i]-2, &new_line);
931 if (copy_end > 0 && contents[copy_end-1] != '\n')
933 new_line = 1;
934 /* write the first part of the config */
936 if (copy_end > copy_begin) {
937 if (write_in_full(fd, contents + copy_begin,
938 copy_end - copy_begin) <
939 copy_end - copy_begin)
940 goto write_err_out;
941 if (new_line &&
942 write_in_full(fd, "\n", 1) != 1)
943 goto write_err_out;
944 }
945 copy_begin = store.offset[i];
946 }
947 /* write the pair (value == NULL means unset) */
949 if (value != NULL) {
950 if (store.state == START) {
951 if (!store_write_section(fd, key))
952 goto write_err_out;
953 }
954 if (!store_write_pair(fd, key, value))
955 goto write_err_out;
956 }
957 /* write the rest of the config */
959 if (copy_begin < contents_sz)
960 if (write_in_full(fd, contents + copy_begin,
961 contents_sz - copy_begin) <
962 contents_sz - copy_begin)
963 goto write_err_out;
964 munmap(contents, contents_sz);
966 }
967 if (commit_lock_file(lock) < 0) {
969 fprintf(stderr, "Cannot commit config file!\n");
970 ret = 4;
971 goto out_free;
972 }
973 /*
975 * lock is committed, so don't try to roll it back below.
976 * NOTE: Since lockfile.c keeps a linked list of all created
977 * lock_file structures, it isn't safe to free(lock). It's
978 * better to just leave it hanging around.
979 */
980 lock = NULL;
981 ret = 0;
982out_free:
984 if (lock)
985 rollback_lock_file(lock);
986 free(config_filename);
987 return ret;
988write_err_out:
990 ret = write_error();
991 goto out_free;
992}
994static int section_name_match (const char *buf, const char *name)
996{
997 int i = 0, j = 0, dot = 0;
998 for (; buf[i] && buf[i] != ']'; i++) {
999 if (!dot && isspace(buf[i])) {
1000 dot = 1;
1001 if (name[j++] != '.')
1002 break;
1003 for (i++; isspace(buf[i]); i++)
1004 ; /* do nothing */
1005 if (buf[i] != '"')
1006 break;
1007 continue;
1008 }
1009 if (buf[i] == '\\' && dot)
1010 i++;
1011 else if (buf[i] == '"' && dot) {
1012 for (i++; isspace(buf[i]); i++)
1013 ; /* do_nothing */
1014 break;
1015 }
1016 if (buf[i] != name[j++])
1017 break;
1018 }
1019 return (buf[i] == ']' && name[j] == 0);
1020}
1021/* if new_name == NULL, the section is removed instead */
1023int git_config_rename_section(const char *old_name, const char *new_name)
1024{
1025 int ret = 0, remove = 0;
1026 char *config_filename;
1027 struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1028 int out_fd;
1029 char buf[1024];
1030 config_filename = getenv(CONFIG_ENVIRONMENT);
1032 if (!config_filename) {
1033 config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
1034 if (!config_filename)
1035 config_filename = git_path("config");
1036 }
1037 config_filename = xstrdup(config_filename);
1038 out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1039 if (out_fd < 0) {
1040 ret = error("Could not lock config file!");
1041 goto out;
1042 }
1043 if (!(config_file = fopen(config_filename, "rb"))) {
1045 /* no config file means nothing to rename, no error */
1046 goto unlock_and_out;
1047 }
1048 while (fgets(buf, sizeof(buf), config_file)) {
1050 int i;
1051 int length;
1052 for (i = 0; buf[i] && isspace(buf[i]); i++)
1053 ; /* do nothing */
1054 if (buf[i] == '[') {
1055 /* it's a section */
1056 if (section_name_match (&buf[i+1], old_name)) {
1057 ret++;
1058 if (new_name == NULL) {
1059 remove = 1;
1060 continue;
1061 }
1062 store.baselen = strlen(new_name);
1063 if (!store_write_section(out_fd, new_name)) {
1064 ret = write_error();
1065 goto out;
1066 }
1067 continue;
1068 }
1069 remove = 0;
1070 }
1071 if (remove)
1072 continue;
1073 length = strlen(buf);
1074 if (write_in_full(out_fd, buf, length) != length) {
1075 ret = write_error();
1076 goto out;
1077 }
1078 }
1079 fclose(config_file);
1080 unlock_and_out:
1081 if (commit_lock_file(lock) < 0)
1082 ret = error("Cannot commit config file!");
1083 out:
1084 free(config_filename);
1085 return ret;
1086}
1087/*
1089 * Call this to report error for your variable that should not
1090 * get a boolean value (i.e. "[my] var" means "true").
1091 */
1092int config_error_nonbool(const char *var)
1093{
1094 return error("Missing value for '%s'", var);
1095}