Support fetching the memory usage of a delta index
[git/git.git] / config.c
CommitLineData
10bea152
JS
1/*
2 * GIT - The information manager from hell
3 *
4 * Copyright (C) Linus Torvalds, 2005
5 * Copyright (C) Johannes Schindelin, 2005
6 *
7 */
17712991
LT
8#include "cache.h"
9
10#define MAXNAME (256)
11
12static FILE *config_file;
0dccc7dc 13static const char *config_file_name;
17712991 14static int config_linenr;
960ccca6
DH
15static int zlib_compression_seen;
16
17712991
LT
17static int get_next_char(void)
18{
19 int c;
20 FILE *f;
21
22 c = '\n';
23 if ((f = config_file) != NULL) {
24 c = fgetc(f);
db2c075d
JH
25 if (c == '\r') {
26 /* DOS like systems */
27 c = fgetc(f);
28 if (c != '\n') {
29 ungetc(c, f);
30 c = '\r';
31 }
32 }
17712991
LT
33 if (c == '\n')
34 config_linenr++;
35 if (c == EOF) {
36 config_file = NULL;
37 c = '\n';
38 }
39 }
40 return c;
41}
42
43static char *parse_value(void)
44{
45 static char value[1024];
46 int quote = 0, comment = 0, len = 0, space = 0;
47
48 for (;;) {
49 int c = get_next_char();
50 if (len >= sizeof(value))
51 return NULL;
52 if (c == '\n') {
53 if (quote)
54 return NULL;
55 value[len] = 0;
56 return value;
57 }
58 if (comment)
59 continue;
60 if (isspace(c) && !quote) {
61 space = 1;
62 continue;
63 }
7ebdba61
JS
64 if (!quote) {
65 if (c == ';' || c == '#') {
66 comment = 1;
67 continue;
68 }
69 }
17712991
LT
70 if (space) {
71 if (len)
72 value[len++] = ' ';
73 space = 0;
74 }
75 if (c == '\\') {
76 c = get_next_char();
77 switch (c) {
78 case '\n':
79 continue;
80 case 't':
81 c = '\t';
82 break;
83 case 'b':
84 c = '\b';
85 break;
86 case 'n':
87 c = '\n';
88 break;
5cbb401d
LT
89 /* Some characters escape as themselves */
90 case '\\': case '"':
91 break;
92 /* Reject unknown escape sequences */
93 default:
94 return NULL;
17712991
LT
95 }
96 value[len++] = c;
97 continue;
98 }
99 if (c == '"') {
100 quote = 1-quote;
101 continue;
102 }
17712991
LT
103 value[len++] = c;
104 }
105}
106
38c5afa8
LT
107static inline int iskeychar(int c)
108{
109 return isalnum(c) || c == '-';
110}
111
17712991
LT
112static int get_value(config_fn_t fn, char *name, unsigned int len)
113{
114 int c;
115 char *value;
116
117 /* Get the full name */
118 for (;;) {
119 c = get_next_char();
120 if (c == EOF)
121 break;
38c5afa8 122 if (!iskeychar(c))
17712991
LT
123 break;
124 name[len++] = tolower(c);
125 if (len >= MAXNAME)
126 return -1;
127 }
128 name[len] = 0;
129 while (c == ' ' || c == '\t')
130 c = get_next_char();
131
132 value = NULL;
133 if (c != '\n') {
134 if (c != '=')
135 return -1;
136 value = parse_value();
137 if (!value)
138 return -1;
139 }
140 return fn(name, value);
141}
142
d14f7764
LT
143static int get_extended_base_var(char *name, int baselen, int c)
144{
145 do {
146 if (c == '\n')
147 return -1;
148 c = get_next_char();
149 } while (isspace(c));
150
151 /* We require the format to be '[base "extension"]' */
152 if (c != '"')
153 return -1;
154 name[baselen++] = '.';
155
156 for (;;) {
157 int c = get_next_char();
158 if (c == '\n')
159 return -1;
160 if (c == '"')
161 break;
162 if (c == '\\') {
163 c = get_next_char();
164 if (c == '\n')
165 return -1;
166 }
167 name[baselen++] = c;
168 if (baselen > MAXNAME / 2)
169 return -1;
170 }
171
172 /* Final ']' */
173 if (get_next_char() != ']')
174 return -1;
175 return baselen;
176}
177
17712991
LT
178static int get_base_var(char *name)
179{
180 int baselen = 0;
181
182 for (;;) {
183 int c = get_next_char();
184 if (c == EOF)
185 return -1;
186 if (c == ']')
187 return baselen;
d14f7764
LT
188 if (isspace(c))
189 return get_extended_base_var(name, baselen, c);
38c5afa8 190 if (!iskeychar(c) && c != '.')
17712991
LT
191 return -1;
192 if (baselen > MAXNAME / 2)
193 return -1;
194 name[baselen++] = tolower(c);
195 }
196}
197
198static int git_parse_file(config_fn_t fn)
199{
200 int comment = 0;
201 int baselen = 0;
202 static char var[MAXNAME];
203
204 for (;;) {
205 int c = get_next_char();
206 if (c == '\n') {
207 /* EOF? */
208 if (!config_file)
209 return 0;
210 comment = 0;
211 continue;
212 }
213 if (comment || isspace(c))
214 continue;
215 if (c == '#' || c == ';') {
216 comment = 1;
217 continue;
218 }
219 if (c == '[') {
220 baselen = get_base_var(var);
221 if (baselen <= 0)
222 break;
223 var[baselen++] = '.';
224 var[baselen] = 0;
225 continue;
226 }
227 if (!isalpha(c))
228 break;
128af9d1 229 var[baselen] = tolower(c);
17712991
LT
230 if (get_value(fn, var, baselen+1) < 0)
231 break;
232 }
4f629539 233 die("bad config file line %d in %s", config_linenr, config_file_name);
17712991
LT
234}
235
236int git_config_int(const char *name, const char *value)
237{
238 if (value && *value) {
239 char *end;
240 int val = strtol(value, &end, 0);
241 if (!*end)
242 return val;
d77a64d3
SP
243 if (!strcasecmp(end, "k"))
244 return val * 1024;
245 if (!strcasecmp(end, "m"))
246 return val * 1024 * 1024;
247 if (!strcasecmp(end, "g"))
248 return val * 1024 * 1024 * 1024;
17712991 249 }
4f629539 250 die("bad config value for '%s' in %s", name, config_file_name);
17712991
LT
251}
252
253int git_config_bool(const char *name, const char *value)
254{
255 if (!value)
256 return 1;
257 if (!*value)
258 return 0;
624314fd 259 if (!strcasecmp(value, "true") || !strcasecmp(value, "yes"))
17712991 260 return 1;
624314fd 261 if (!strcasecmp(value, "false") || !strcasecmp(value, "no"))
17712991
LT
262 return 0;
263 return git_config_int(name, value) != 0;
264}
265
266int git_default_config(const char *var, const char *value)
267{
268 /* This needs a better name */
269 if (!strcmp(var, "core.filemode")) {
270 trust_executable_bit = git_config_bool(var, value);
271 return 0;
272 }
273
9378c161
JH
274 if (!strcmp(var, "core.quotepath")) {
275 quote_path_fully = git_config_bool(var, value);
276 return 0;
277 }
278
78a8d641
JS
279 if (!strcmp(var, "core.symlinks")) {
280 has_symlinks = git_config_bool(var, value);
281 return 0;
282 }
283
7d1864ce
JH
284 if (!strcmp(var, "core.bare")) {
285 is_bare_repository_cfg = git_config_bool(var, value);
286 return 0;
287 }
288
5f73076c
JH
289 if (!strcmp(var, "core.ignorestat")) {
290 assume_unchanged = git_config_bool(var, value);
291 return 0;
292 }
293
e388c738
JH
294 if (!strcmp(var, "core.prefersymlinkrefs")) {
295 prefer_symlink_refs = git_config_bool(var, value);
f8348be3
JS
296 return 0;
297 }
298
6de08ae6
SP
299 if (!strcmp(var, "core.logallrefupdates")) {
300 log_all_ref_updates = git_config_bool(var, value);
301 return 0;
302 }
303
2f8acdb3
JH
304 if (!strcmp(var, "core.warnambiguousrefs")) {
305 warn_ambiguous_refs = git_config_bool(var, value);
306 return 0;
307 }
308
960ccca6 309 if (!strcmp(var, "core.loosecompression")) {
12f6c308
JBH
310 int level = git_config_int(var, value);
311 if (level == -1)
312 level = Z_DEFAULT_COMPRESSION;
313 else if (level < 0 || level > Z_BEST_COMPRESSION)
314 die("bad zlib compression level %d", level);
315 zlib_compression_level = level;
960ccca6
DH
316 zlib_compression_seen = 1;
317 return 0;
318 }
319
320 if (!strcmp(var, "core.compression")) {
321 int level = git_config_int(var, value);
322 if (level == -1)
323 level = Z_DEFAULT_COMPRESSION;
324 else if (level < 0 || level > Z_BEST_COMPRESSION)
325 die("bad zlib compression level %d", level);
326 core_compression_level = level;
327 core_compression_seen = 1;
328 if (!zlib_compression_seen)
329 zlib_compression_level = level;
12f6c308
JBH
330 return 0;
331 }
332
60bb8b14 333 if (!strcmp(var, "core.packedgitwindowsize")) {
5faaf246 334 int pgsz_x2 = getpagesize() * 2;
60bb8b14 335 packed_git_window_size = git_config_int(var, value);
5faaf246
JH
336
337 /* This value must be multiple of (pagesize * 2) */
338 packed_git_window_size /= pgsz_x2;
339 if (packed_git_window_size < 1)
340 packed_git_window_size = 1;
341 packed_git_window_size *= pgsz_x2;
60bb8b14
SP
342 return 0;
343 }
344
77ccc5bb
SP
345 if (!strcmp(var, "core.packedgitlimit")) {
346 packed_git_limit = git_config_int(var, value);
347 return 0;
348 }
349
18bdec11
SP
350 if (!strcmp(var, "core.deltabasecachelimit")) {
351 delta_base_cache_limit = git_config_int(var, value);
352 return 0;
353 }
354
6c510bee 355 if (!strcmp(var, "core.autocrlf")) {
d7f46334
LT
356 if (value && !strcasecmp(value, "input")) {
357 auto_crlf = -1;
358 return 0;
359 }
6c510bee
LT
360 auto_crlf = git_config_bool(var, value);
361 return 0;
362 }
363
e1b10391 364 if (!strcmp(var, "user.name")) {
817151e6 365 strlcpy(git_default_name, value, sizeof(git_default_name));
e1b10391
LT
366 return 0;
367 }
368
369 if (!strcmp(var, "user.email")) {
817151e6 370 strlcpy(git_default_email, value, sizeof(git_default_email));
e1b10391
LT
371 return 0;
372 }
373
4e72dcec 374 if (!strcmp(var, "i18n.commitencoding")) {
dbb2b41a 375 git_commit_encoding = xstrdup(value);
4e72dcec
JH
376 return 0;
377 }
378
d2c11a38 379 if (!strcmp(var, "i18n.logoutputencoding")) {
dbb2b41a 380 git_log_output_encoding = xstrdup(value);
d2c11a38
JH
381 return 0;
382 }
383
384
a159ca0c 385 if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
aa086eb8
ML
386 pager_use_color = git_config_bool(var,value);
387 return 0;
388 }
389
54adf370
BG
390 if (!strcmp(var, "core.pager")) {
391 pager_program = xstrdup(value);
392 return 0;
393 }
394
1ab661dd 395 /* Add other config variables here and to Documentation/config.txt. */
17712991
LT
396 return 0;
397}
398
4f629539 399int git_config_from_file(config_fn_t fn, const char *filename)
17712991
LT
400{
401 int ret;
4f629539 402 FILE *f = fopen(filename, "r");
17712991
LT
403
404 ret = -1;
405 if (f) {
406 config_file = f;
4f629539 407 config_file_name = filename;
17712991
LT
408 config_linenr = 1;
409 ret = git_parse_file(fn);
410 fclose(f);
4f629539 411 config_file_name = NULL;
17712991
LT
412 }
413 return ret;
414}
10bea152 415
4f629539
JH
416int git_config(config_fn_t fn)
417{
5f1a63e0
JS
418 int ret = 0;
419 char *repo_config = NULL;
420 const char *home = NULL, *filename;
421
422 /* $GIT_CONFIG makes git read _only_ the given config file,
423 * $GIT_CONFIG_LOCAL will make it process it in addition to the
424 * global config file, the same way it would the per-repository
425 * config file otherwise. */
d4ebc36c 426 filename = getenv(CONFIG_ENVIRONMENT);
5f1a63e0 427 if (!filename) {
32043c9f
JS
428 if (!access(ETC_GITCONFIG, R_OK))
429 ret += git_config_from_file(fn, ETC_GITCONFIG);
5f1a63e0 430 home = getenv("HOME");
d4ebc36c 431 filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
5f1a63e0 432 if (!filename)
9befac47 433 filename = repo_config = xstrdup(git_path("config"));
7f29f7a9 434 }
5f1a63e0
JS
435
436 if (home) {
9befac47 437 char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
e33d0611 438 if (!access(user_config, R_OK))
5f1a63e0
JS
439 ret = git_config_from_file(fn, user_config);
440 free(user_config);
441 }
442
443 ret += git_config_from_file(fn, filename);
4cac42b1 444 free(repo_config);
5f1a63e0 445 return ret;
4f629539
JH
446}
447
10bea152
JS
448/*
449 * Find all the stuff for git_config_set() below.
450 */
4ddba79d
JS
451
452#define MAX_MATCHES 512
453
10bea152
JS
454static struct {
455 int baselen;
456 char* key;
f98d863d 457 int do_not_match;
10bea152 458 regex_t* value_regex;
4ddba79d 459 int multi_replace;
dc49cd76 460 size_t offset[MAX_MATCHES];
10bea152
JS
461 enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
462 int seen;
463} store;
464
f98d863d
JS
465static int matches(const char* key, const char* value)
466{
467 return !strcmp(key, store.key) &&
468 (store.value_regex == NULL ||
469 (store.do_not_match ^
470 !regexec(store.value_regex, value, 0, NULL, 0)));
471}
472
10bea152
JS
473static int store_aux(const char* key, const char* value)
474{
ae9ee41d
JH
475 const char *ep;
476 size_t section_len;
477
10bea152
JS
478 switch (store.state) {
479 case KEY_SEEN:
f98d863d 480 if (matches(key, value)) {
4ddba79d 481 if (store.seen == 1 && store.multi_replace == 0) {
10bea152
JS
482 fprintf(stderr,
483 "Warning: %s has multiple values\n",
484 key);
4ddba79d
JS
485 } else if (store.seen >= MAX_MATCHES) {
486 fprintf(stderr, "Too many matches\n");
487 return 1;
10bea152 488 }
4ddba79d
JS
489
490 store.offset[store.seen] = ftell(config_file);
10bea152
JS
491 store.seen++;
492 }
493 break;
494 case SECTION_SEEN:
ae9ee41d
JH
495 /*
496 * What we are looking for is in store.key (both
497 * section and var), and its section part is baselen
498 * long. We found key (again, both section and var).
499 * We would want to know if this key is in the same
500 * section as what we are looking for. We already
501 * know we are in the same section as what should
502 * hold store.key.
503 */
504 ep = strrchr(key, '.');
505 section_len = ep - key;
506
507 if ((section_len != store.baselen) ||
508 memcmp(key, store.key, section_len+1)) {
10bea152
JS
509 store.state = SECTION_END_SEEN;
510 break;
ae9ee41d
JH
511 }
512
513 /*
514 * Do not increment matches: this is no match, but we
515 * just made sure we are in the desired section.
516 */
517 store.offset[store.seen] = ftell(config_file);
10bea152
JS
518 /* fallthru */
519 case SECTION_END_SEEN:
520 case START:
f98d863d 521 if (matches(key, value)) {
4ddba79d 522 store.offset[store.seen] = ftell(config_file);
10bea152
JS
523 store.state = KEY_SEEN;
524 store.seen++;
d14f7764
LT
525 } else {
526 if (strrchr(key, '.') - key == store.baselen &&
bdf0ef08 527 !strncmp(key, store.key, store.baselen)) {
93ddef3e 528 store.state = SECTION_SEEN;
bdf0ef08 529 store.offset[store.seen] = ftell(config_file);
d14f7764 530 }
bdf0ef08 531 }
10bea152
JS
532 }
533 return 0;
534}
535
b79d18c9 536static int write_error(void)
480c9e52
AW
537{
538 fprintf(stderr, "Failed to write new configuration file\n");
539
540 /* Same error code as "failed to rename". */
541 return 4;
542}
543
544static int store_write_section(int fd, const char* key)
10bea152 545{
d14f7764
LT
546 const char *dot = strchr(key, '.');
547 int len1 = store.baselen, len2 = -1;
548
549 dot = strchr(key, '.');
550 if (dot) {
551 int dotlen = dot - key;
552 if (dotlen < len1) {
553 len2 = len1 - dotlen - 1;
554 len1 = dotlen;
555 }
556 }
557
480c9e52
AW
558 if (write_in_full(fd, "[", 1) != 1 ||
559 write_in_full(fd, key, len1) != len1)
560 return 0;
d14f7764 561 if (len2 >= 0) {
480c9e52
AW
562 if (write_in_full(fd, " \"", 2) != 2)
563 return 0;
d14f7764
LT
564 while (--len2 >= 0) {
565 unsigned char c = *++dot;
566 if (c == '"')
480c9e52
AW
567 if (write_in_full(fd, "\\", 1) != 1)
568 return 0;
569 if (write_in_full(fd, &c, 1) != 1)
570 return 0;
d14f7764 571 }
480c9e52
AW
572 if (write_in_full(fd, "\"", 1) != 1)
573 return 0;
d14f7764 574 }
480c9e52
AW
575 if (write_in_full(fd, "]\n", 2) != 2)
576 return 0;
577
578 return 1;
10bea152
JS
579}
580
480c9e52 581static int store_write_pair(int fd, const char* key, const char* value)
10bea152
JS
582{
583 int i;
480c9e52 584 int length = strlen(key+store.baselen+1);
cdd4fb15
BG
585 int quote = 0;
586
587 /* Check to see if the value needs to be quoted. */
588 if (value[0] == ' ')
589 quote = 1;
590 for (i = 0; value[i]; i++)
591 if (value[i] == ';' || value[i] == '#')
592 quote = 1;
593 if (value[i-1] == ' ')
594 quote = 1;
10bea152 595
480c9e52
AW
596 if (write_in_full(fd, "\t", 1) != 1 ||
597 write_in_full(fd, key+store.baselen+1, length) != length ||
598 write_in_full(fd, " = ", 3) != 3)
599 return 0;
cdd4fb15
BG
600 if (quote && write_in_full(fd, "\"", 1) != 1)
601 return 0;
10bea152
JS
602 for (i = 0; value[i]; i++)
603 switch (value[i]) {
480c9e52
AW
604 case '\n':
605 if (write_in_full(fd, "\\n", 2) != 2)
606 return 0;
607 break;
608 case '\t':
609 if (write_in_full(fd, "\\t", 2) != 2)
610 return 0;
611 break;
612 case '"':
613 case '\\':
614 if (write_in_full(fd, "\\", 1) != 1)
615 return 0;
616 default:
617 if (write_in_full(fd, value+i, 1) != 1)
618 return 0;
619 break;
620 }
cdd4fb15
BG
621 if (quote && write_in_full(fd, "\"", 1) != 1)
622 return 0;
480c9e52
AW
623 if (write_in_full(fd, "\n", 1) != 1)
624 return 0;
625 return 1;
10bea152
JS
626}
627
dc49cd76
SP
628static ssize_t find_beginning_of_line(const char* contents, size_t size,
629 size_t offset_, int* found_bracket)
4ddba79d 630{
dc49cd76
SP
631 size_t equal_offset = size, bracket_offset = size;
632 ssize_t offset;
4ddba79d 633
a6080a0a 634 for (offset = offset_-2; offset > 0
4ddba79d
JS
635 && contents[offset] != '\n'; offset--)
636 switch (contents[offset]) {
637 case '=': equal_offset = offset; break;
638 case ']': bracket_offset = offset; break;
639 }
640 if (bracket_offset < equal_offset) {
641 *found_bracket = 1;
642 offset = bracket_offset+1;
643 } else
644 offset++;
645
646 return offset;
647}
648
10bea152
JS
649int git_config_set(const char* key, const char* value)
650{
4ddba79d 651 return git_config_set_multivar(key, value, NULL, 0);
10bea152
JS
652}
653
654/*
655 * If value==NULL, unset in (remove from) config,
656 * if value_regex!=NULL, disregard key/value pairs where value does not match.
4ddba79d
JS
657 * if multi_replace==0, nothing, or only one matching key/value is replaced,
658 * else all matching key/values (regardless how many) are removed,
659 * before the new pair is written.
10bea152
JS
660 *
661 * Returns 0 on success.
662 *
663 * This function does this:
664 *
665 * - it locks the config file by creating ".git/config.lock"
666 *
667 * - it then parses the config using store_aux() as validator to find
668 * the position on the key/value pair to replace. If it is to be unset,
669 * it must be found exactly once.
670 *
671 * - the config file is mmap()ed and the part before the match (if any) is
672 * written to the lock file, then the changed part and the rest.
673 *
674 * - the config file is removed and the lock file rename()d to it.
675 *
676 */
677int git_config_set_multivar(const char* key, const char* value,
4ddba79d 678 const char* value_regex, int multi_replace)
10bea152 679{
d14f7764 680 int i, dot;
f8ba655e 681 int fd = -1, in_fd;
dafc88b1 682 int ret;
9c3796fc
JS
683 char* config_filename;
684 char* lock_file;
b17e659d 685 const char* last_dot = strrchr(key, '.');
4ddba79d 686
d4ebc36c 687 config_filename = getenv(CONFIG_ENVIRONMENT);
9c3796fc 688 if (!config_filename) {
d4ebc36c 689 config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
9c3796fc
JS
690 if (!config_filename)
691 config_filename = git_path("config");
692 }
9befac47
SP
693 config_filename = xstrdup(config_filename);
694 lock_file = xstrdup(mkpath("%s.lock", config_filename));
9c3796fc 695
10bea152
JS
696 /*
697 * Since "key" actually contains the section name and the real
698 * key name separated by a dot, we have to know where the dot is.
699 */
b17e659d 700
dafc88b1 701 if (last_dot == NULL) {
10bea152 702 fprintf(stderr, "key does not contain a section: %s\n", key);
dafc88b1
SH
703 ret = 2;
704 goto out_free;
10bea152 705 }
b17e659d
JS
706 store.baselen = last_dot - key;
707
708 store.multi_replace = multi_replace;
10bea152
JS
709
710 /*
711 * Validate the key and while at it, lower case it for matching.
712 */
2d7320d0 713 store.key = xmalloc(strlen(key) + 1);
d14f7764
LT
714 dot = 0;
715 for (i = 0; key[i]; i++) {
716 unsigned char c = key[i];
717 if (c == '.')
718 dot = 1;
719 /* Leave the extended basename untouched.. */
720 if (!dot || i > store.baselen) {
38c5afa8 721 if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
d14f7764
LT
722 fprintf(stderr, "invalid key: %s\n", key);
723 free(store.key);
724 ret = 1;
725 goto out_free;
726 }
727 c = tolower(c);
6f71686e
JS
728 } else if (c == '\n') {
729 fprintf(stderr, "invalid key (newline): %s\n", key);
730 free(store.key);
731 ret = 1;
732 goto out_free;
d14f7764
LT
733 }
734 store.key[i] = c;
735 }
3dd94e3b 736 store.key[i] = 0;
10bea152
JS
737
738 /*
739 * The lock_file serves a purpose in addition to locking: the new
740 * contents of .git/config will be written into it.
741 */
742 fd = open(lock_file, O_WRONLY | O_CREAT | O_EXCL, 0666);
138086a7 743 if (fd < 0 || adjust_shared_perm(lock_file)) {
10bea152
JS
744 fprintf(stderr, "could not lock config file\n");
745 free(store.key);
dafc88b1
SH
746 ret = -1;
747 goto out_free;
10bea152
JS
748 }
749
750 /*
751 * If .git/config does not exist yet, write a minimal version.
752 */
88fb958b
AR
753 in_fd = open(config_filename, O_RDONLY);
754 if ( in_fd < 0 ) {
10bea152
JS
755 free(store.key);
756
88fb958b
AR
757 if ( ENOENT != errno ) {
758 error("opening %s: %s", config_filename,
759 strerror(errno));
dafc88b1
SH
760 ret = 3; /* same as "invalid config file" */
761 goto out_free;
88fb958b 762 }
10bea152
JS
763 /* if nothing to unset, error out */
764 if (value == NULL) {
dafc88b1
SH
765 ret = 5;
766 goto out_free;
10bea152
JS
767 }
768
769 store.key = (char*)key;
480c9e52 770 if (!store_write_section(fd, key) ||
93c1e079
JH
771 !store_write_pair(fd, key, value))
772 goto write_err_out;
773 } else {
88fb958b 774 struct stat st;
10bea152 775 char* contents;
dc49cd76
SP
776 size_t contents_sz, copy_begin, copy_end;
777 int i, new_line = 0;
10bea152
JS
778
779 if (value_regex == NULL)
780 store.value_regex = NULL;
781 else {
f98d863d
JS
782 if (value_regex[0] == '!') {
783 store.do_not_match = 1;
784 value_regex++;
785 } else
786 store.do_not_match = 0;
787
2d7320d0 788 store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
10bea152
JS
789 if (regcomp(store.value_regex, value_regex,
790 REG_EXTENDED)) {
7246ed43 791 fprintf(stderr, "Invalid pattern: %s\n",
10bea152
JS
792 value_regex);
793 free(store.value_regex);
dafc88b1
SH
794 ret = 6;
795 goto out_free;
10bea152
JS
796 }
797 }
798
4ddba79d 799 store.offset[0] = 0;
10bea152
JS
800 store.state = START;
801 store.seen = 0;
802
803 /*
804 * After this, store.offset will contain the *end* offset
805 * of the last match, or remain at 0 if no match was found.
806 * As a side effect, we make sure to transform only a valid
807 * existing config file.
808 */
9c3796fc 809 if (git_config_from_file(store_aux, config_filename)) {
10bea152
JS
810 fprintf(stderr, "invalid config file\n");
811 free(store.key);
812 if (store.value_regex != NULL) {
813 regfree(store.value_regex);
814 free(store.value_regex);
815 }
dafc88b1
SH
816 ret = 3;
817 goto out_free;
10bea152
JS
818 }
819
820 free(store.key);
821 if (store.value_regex != NULL) {
822 regfree(store.value_regex);
823 free(store.value_regex);
824 }
825
4ddba79d
JS
826 /* if nothing to unset, or too many matches, error out */
827 if ((store.seen == 0 && value == NULL) ||
828 (store.seen > 1 && multi_replace == 0)) {
dafc88b1
SH
829 ret = 5;
830 goto out_free;
10bea152
JS
831 }
832
88fb958b 833 fstat(in_fd, &st);
dc49cd76
SP
834 contents_sz = xsize_t(st.st_size);
835 contents = xmmap(NULL, contents_sz, PROT_READ,
10bea152
JS
836 MAP_PRIVATE, in_fd, 0);
837 close(in_fd);
838
4ddba79d
JS
839 if (store.seen == 0)
840 store.seen = 1;
841
842 for (i = 0, copy_begin = 0; i < store.seen; i++) {
843 if (store.offset[i] == 0) {
dc49cd76 844 store.offset[i] = copy_end = contents_sz;
4ddba79d
JS
845 } else if (store.state != KEY_SEEN) {
846 copy_end = store.offset[i];
10bea152 847 } else
4ddba79d 848 copy_end = find_beginning_of_line(
dc49cd76 849 contents, contents_sz,
4ddba79d
JS
850 store.offset[i]-2, &new_line);
851
852 /* write the first part of the config */
853 if (copy_end > copy_begin) {
93c1e079
JH
854 if (write_in_full(fd, contents + copy_begin,
855 copy_end - copy_begin) <
856 copy_end - copy_begin)
857 goto write_err_out;
858 if (new_line &&
859 write_in_full(fd, "\n", 1) != 1)
860 goto write_err_out;
4ddba79d
JS
861 }
862 copy_begin = store.offset[i];
10bea152
JS
863 }
864
10bea152
JS
865 /* write the pair (value == NULL means unset) */
866 if (value != NULL) {
93c1e079
JH
867 if (store.state == START) {
868 if (!store_write_section(fd, key))
869 goto write_err_out;
480c9e52 870 }
93c1e079
JH
871 if (!store_write_pair(fd, key, value))
872 goto write_err_out;
10bea152
JS
873 }
874
875 /* write the rest of the config */
dc49cd76 876 if (copy_begin < contents_sz)
93c1e079 877 if (write_in_full(fd, contents + copy_begin,
dc49cd76
SP
878 contents_sz - copy_begin) <
879 contents_sz - copy_begin)
93c1e079 880 goto write_err_out;
10bea152 881
dc49cd76 882 munmap(contents, contents_sz);
3a2f2bb3 883 unlink(config_filename);
10bea152
JS
884 }
885
3a2f2bb3 886 if (rename(lock_file, config_filename) < 0) {
10bea152 887 fprintf(stderr, "Could not rename the lock file?\n");
dafc88b1
SH
888 ret = 4;
889 goto out_free;
10bea152
JS
890 }
891
dafc88b1
SH
892 ret = 0;
893
894out_free:
f8ba655e
JH
895 if (0 <= fd)
896 close(fd);
4cac42b1 897 free(config_filename);
f8ba655e
JH
898 if (lock_file) {
899 unlink(lock_file);
dafc88b1 900 free(lock_file);
f8ba655e 901 }
dafc88b1 902 return ret;
93c1e079
JH
903
904write_err_out:
905 ret = write_error();
906 goto out_free;
907
10bea152
JS
908}
909
118f8b24
PB
910static int section_name_match (const char *buf, const char *name)
911{
912 int i = 0, j = 0, dot = 0;
913 for (; buf[i] && buf[i] != ']'; i++) {
914 if (!dot && isspace(buf[i])) {
915 dot = 1;
916 if (name[j++] != '.')
917 break;
918 for (i++; isspace(buf[i]); i++)
919 ; /* do nothing */
920 if (buf[i] != '"')
921 break;
922 continue;
923 }
924 if (buf[i] == '\\' && dot)
925 i++;
926 else if (buf[i] == '"' && dot) {
927 for (i++; isspace(buf[i]); i++)
928 ; /* do_nothing */
929 break;
930 }
931 if (buf[i] != name[j++])
932 break;
933 }
934 return (buf[i] == ']' && name[j] == 0);
935}
936
937/* if new_name == NULL, the section is removed instead */
0667fcfb
JS
938int git_config_rename_section(const char *old_name, const char *new_name)
939{
118f8b24 940 int ret = 0, remove = 0;
fc1905bb 941 char *config_filename;
0667fcfb
JS
942 struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
943 int out_fd;
944 char buf[1024];
945
d4ebc36c 946 config_filename = getenv(CONFIG_ENVIRONMENT);
0667fcfb 947 if (!config_filename) {
d4ebc36c 948 config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
0667fcfb
JS
949 if (!config_filename)
950 config_filename = git_path("config");
951 }
952 config_filename = xstrdup(config_filename);
953 out_fd = hold_lock_file_for_update(lock, config_filename, 0);
fc1905bb
JH
954 if (out_fd < 0) {
955 ret = error("Could not lock config file!");
956 goto out;
957 }
0667fcfb 958
fc1905bb 959 if (!(config_file = fopen(config_filename, "rb"))) {
01ebb9dc
GB
960 /* no config file means nothing to rename, no error */
961 goto unlock_and_out;
fc1905bb 962 }
0667fcfb
JS
963
964 while (fgets(buf, sizeof(buf), config_file)) {
965 int i;
480c9e52 966 int length;
0667fcfb
JS
967 for (i = 0; buf[i] && isspace(buf[i]); i++)
968 ; /* do nothing */
969 if (buf[i] == '[') {
970 /* it's a section */
118f8b24
PB
971 if (section_name_match (&buf[i+1], old_name)) {
972 ret++;
973 if (new_name == NULL) {
974 remove = 1;
0667fcfb
JS
975 continue;
976 }
0667fcfb 977 store.baselen = strlen(new_name);
480c9e52
AW
978 if (!store_write_section(out_fd, new_name)) {
979 ret = write_error();
980 goto out;
981 }
0667fcfb
JS
982 continue;
983 }
118f8b24 984 remove = 0;
0667fcfb 985 }
118f8b24
PB
986 if (remove)
987 continue;
480c9e52
AW
988 length = strlen(buf);
989 if (write_in_full(out_fd, buf, length) != length) {
990 ret = write_error();
991 goto out;
992 }
0667fcfb 993 }
fc1905bb 994 fclose(config_file);
01ebb9dc 995 unlock_and_out:
0667fcfb 996 if (close(out_fd) || commit_lock_file(lock) < 0)
480c9e52 997 ret = error("Cannot commit config file!");
fc1905bb
JH
998 out:
999 free(config_filename);
0667fcfb
JS
1000 return ret;
1001}