Merge branch 'maint'
[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 8#include "cache.h"
7f0e39fa 9#include "exec_cmd.h"
17712991
LT
10
11#define MAXNAME (256)
12
13static FILE *config_file;
0dccc7dc 14static const char *config_file_name;
17712991 15static int config_linenr;
02e5ba4a 16static int config_file_eof;
960ccca6
DH
17static int zlib_compression_seen;
18
17712991
LT
19static 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);
db2c075d
JH
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 }
17712991
LT
35 if (c == '\n')
36 config_linenr++;
37 if (c == EOF) {
02e5ba4a 38 config_file_eof = 1;
17712991
LT
39 c = '\n';
40 }
41 }
42 return c;
43}
44
45static 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 }
7ebdba61
JS
66 if (!quote) {
67 if (c == ';' || c == '#') {
68 comment = 1;
69 continue;
70 }
71 }
17712991
LT
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;
5cbb401d
LT
91 /* Some characters escape as themselves */
92 case '\\': case '"':
93 break;
94 /* Reject unknown escape sequences */
95 default:
96 return NULL;
17712991
LT
97 }
98 value[len++] = c;
99 continue;
100 }
101 if (c == '"') {
102 quote = 1-quote;
103 continue;
104 }
17712991
LT
105 value[len++] = c;
106 }
107}
108
38c5afa8
LT
109static inline int iskeychar(int c)
110{
111 return isalnum(c) || c == '-';
112}
113
17712991
LT
114static 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();
02e5ba4a 122 if (config_file_eof)
17712991 123 break;
38c5afa8 124 if (!iskeychar(c))
17712991
LT
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
d14f7764
LT
145static 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
17712991
LT
180static int get_base_var(char *name)
181{
182 int baselen = 0;
183
184 for (;;) {
185 int c = get_next_char();
02e5ba4a 186 if (config_file_eof)
17712991
LT
187 return -1;
188 if (c == ']')
189 return baselen;
d14f7764
LT
190 if (isspace(c))
191 return get_extended_base_var(name, baselen, c);
38c5afa8 192 if (!iskeychar(c) && c != '.')
17712991
LT
193 return -1;
194 if (baselen > MAXNAME / 2)
195 return -1;
196 name[baselen++] = tolower(c);
197 }
198}
199
200static 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') {
02e5ba4a 209 if (config_file_eof)
17712991
LT
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;
128af9d1 230 var[baselen] = tolower(c);
17712991
LT
231 if (get_value(fn, var, baselen+1) < 0)
232 break;
233 }
4f629539 234 die("bad config file line %d in %s", config_linenr, config_file_name);
17712991
LT
235}
236
c8deb5a1 237static int parse_unit_factor(const char *end, unsigned long *val)
0b87b6e0
BD
238{
239 if (!*end)
240 return 1;
c8deb5a1
SP
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;
0b87b6e0
BD
254}
255
256int git_parse_long(const char *value, long *ret)
257{
258 if (value && *value) {
259 char *end;
260 long val = strtol(value, &end, 0);
c8deb5a1
SP
261 unsigned long factor = 1;
262 if (!parse_unit_factor(end, &factor))
263 return 0;
264 *ret = val * factor;
0b87b6e0
BD
265 return 1;
266 }
267 return 0;
268}
269
270int git_parse_ulong(const char *value, unsigned long *ret)
17712991
LT
271{
272 if (value && *value) {
273 char *end;
0b87b6e0 274 unsigned long val = strtoul(value, &end, 0);
c8deb5a1
SP
275 if (!parse_unit_factor(end, &val))
276 return 0;
277 *ret = val;
0b87b6e0 278 return 1;
17712991 279 }
0b87b6e0
BD
280 return 0;
281}
282
283int 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
291unsigned 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;
17712991
LT
297}
298
299int git_config_bool(const char *name, const char *value)
300{
301 if (!value)
302 return 1;
303 if (!*value)
304 return 0;
624314fd 305 if (!strcasecmp(value, "true") || !strcasecmp(value, "yes"))
17712991 306 return 1;
624314fd 307 if (!strcasecmp(value, "false") || !strcasecmp(value, "no"))
17712991
LT
308 return 0;
309 return git_config_int(name, value) != 0;
310}
311
312int 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
9378c161
JH
320 if (!strcmp(var, "core.quotepath")) {
321 quote_path_fully = git_config_bool(var, value);
322 return 0;
323 }
324
78a8d641
JS
325 if (!strcmp(var, "core.symlinks")) {
326 has_symlinks = git_config_bool(var, value);
327 return 0;
328 }
329
7d1864ce
JH
330 if (!strcmp(var, "core.bare")) {
331 is_bare_repository_cfg = git_config_bool(var, value);
332 return 0;
333 }
334
5f73076c
JH
335 if (!strcmp(var, "core.ignorestat")) {
336 assume_unchanged = git_config_bool(var, value);
337 return 0;
338 }
339
e388c738
JH
340 if (!strcmp(var, "core.prefersymlinkrefs")) {
341 prefer_symlink_refs = git_config_bool(var, value);
f8348be3
JS
342 return 0;
343 }
344
6de08ae6
SP
345 if (!strcmp(var, "core.logallrefupdates")) {
346 log_all_ref_updates = git_config_bool(var, value);
347 return 0;
348 }
349
2f8acdb3
JH
350 if (!strcmp(var, "core.warnambiguousrefs")) {
351 warn_ambiguous_refs = git_config_bool(var, value);
352 return 0;
353 }
354
960ccca6 355 if (!strcmp(var, "core.loosecompression")) {
12f6c308
JBH
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;
960ccca6
DH
362 zlib_compression_seen = 1;
363 return 0;
364 }
365
366 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;
12f6c308
JBH
376 return 0;
377 }
378
60bb8b14 379 if (!strcmp(var, "core.packedgitwindowsize")) {
5faaf246 380 int pgsz_x2 = getpagesize() * 2;
60bb8b14 381 packed_git_window_size = git_config_int(var, value);
5faaf246
JH
382
383 /* 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;
60bb8b14
SP
388 return 0;
389 }
390
77ccc5bb
SP
391 if (!strcmp(var, "core.packedgitlimit")) {
392 packed_git_limit = git_config_int(var, value);
393 return 0;
394 }
395
18bdec11
SP
396 if (!strcmp(var, "core.deltabasecachelimit")) {
397 delta_base_cache_limit = git_config_int(var, value);
398 return 0;
399 }
400
6c510bee 401 if (!strcmp(var, "core.autocrlf")) {
d7f46334
LT
402 if (value && !strcasecmp(value, "input")) {
403 auto_crlf = -1;
404 return 0;
405 }
6c510bee
LT
406 auto_crlf = git_config_bool(var, value);
407 return 0;
408 }
409
e1b10391 410 if (!strcmp(var, "user.name")) {
817151e6 411 strlcpy(git_default_name, value, sizeof(git_default_name));
e1b10391
LT
412 return 0;
413 }
414
415 if (!strcmp(var, "user.email")) {
817151e6 416 strlcpy(git_default_email, value, sizeof(git_default_email));
e1b10391
LT
417 return 0;
418 }
419
4e72dcec 420 if (!strcmp(var, "i18n.commitencoding")) {
dbb2b41a 421 git_commit_encoding = xstrdup(value);
4e72dcec
JH
422 return 0;
423 }
424
d2c11a38 425 if (!strcmp(var, "i18n.logoutputencoding")) {
dbb2b41a 426 git_log_output_encoding = xstrdup(value);
d2c11a38
JH
427 return 0;
428 }
429
430
a159ca0c 431 if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
aa086eb8
ML
432 pager_use_color = git_config_bool(var,value);
433 return 0;
434 }
435
54adf370
BG
436 if (!strcmp(var, "core.pager")) {
437 pager_program = xstrdup(value);
438 return 0;
439 }
440
4d87b9c5
JS
441 if (!strcmp(var, "core.editor")) {
442 editor_program = xstrdup(value);
443 return 0;
444 }
445
039bc64e
JH
446 if (!strcmp(var, "core.excludesfile")) {
447 if (!value)
448 die("core.excludesfile without value");
449 excludes_file = xstrdup(value);
450 return 0;
451 }
452
a9cc857a 453 if (!strcmp(var, "core.whitespace")) {
cf1b7869 454 whitespace_rule_cfg = parse_whitespace_rule(value);
a9cc857a
JH
455 return 0;
456 }
457
1ab661dd 458 /* Add other config variables here and to Documentation/config.txt. */
17712991
LT
459 return 0;
460}
461
4f629539 462int git_config_from_file(config_fn_t fn, const char *filename)
17712991
LT
463{
464 int ret;
4f629539 465 FILE *f = fopen(filename, "r");
17712991
LT
466
467 ret = -1;
468 if (f) {
469 config_file = f;
4f629539 470 config_file_name = filename;
17712991 471 config_linenr = 1;
02e5ba4a 472 config_file_eof = 0;
17712991
LT
473 ret = git_parse_file(fn);
474 fclose(f);
4f629539 475 config_file_name = NULL;
17712991
LT
476 }
477 return ret;
478}
10bea152 479
506b17b1
JS
480const char *git_etc_gitconfig(void)
481{
7f0e39fa
JS
482 static const char *system_wide;
483 if (!system_wide) {
484 system_wide = ETC_GITCONFIG;
485 if (!is_absolute_path(system_wide)) {
486 /* interpret path relative to exec-dir */
ef5b9d6e
JS
487 struct strbuf d = STRBUF_INIT;
488 strbuf_addf(&d, "%s/%s", git_exec_path(), system_wide);
489 system_wide = strbuf_detach(&d, NULL);
7f0e39fa
JS
490 }
491 }
492 return system_wide;
506b17b1
JS
493}
494
4f629539
JH
495int git_config(config_fn_t fn)
496{
5f1a63e0
JS
497 int ret = 0;
498 char *repo_config = NULL;
499 const char *home = NULL, *filename;
500
501 /* $GIT_CONFIG makes git read _only_ the given config file,
502 * $GIT_CONFIG_LOCAL will make it process it in addition to the
503 * global config file, the same way it would the per-repository
504 * config file otherwise. */
d4ebc36c 505 filename = getenv(CONFIG_ENVIRONMENT);
5f1a63e0 506 if (!filename) {
506b17b1
JS
507 if (!access(git_etc_gitconfig(), R_OK))
508 ret += git_config_from_file(fn, git_etc_gitconfig());
5f1a63e0 509 home = getenv("HOME");
d4ebc36c 510 filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
5f1a63e0 511 if (!filename)
9befac47 512 filename = repo_config = xstrdup(git_path("config"));
7f29f7a9 513 }
5f1a63e0
JS
514
515 if (home) {
9befac47 516 char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
e33d0611 517 if (!access(user_config, R_OK))
5f1a63e0
JS
518 ret = git_config_from_file(fn, user_config);
519 free(user_config);
520 }
521
522 ret += git_config_from_file(fn, filename);
4cac42b1 523 free(repo_config);
5f1a63e0 524 return ret;
4f629539
JH
525}
526
10bea152
JS
527/*
528 * Find all the stuff for git_config_set() below.
529 */
4ddba79d
JS
530
531#define MAX_MATCHES 512
532
10bea152
JS
533static struct {
534 int baselen;
535 char* key;
f98d863d 536 int do_not_match;
10bea152 537 regex_t* value_regex;
4ddba79d 538 int multi_replace;
dc49cd76 539 size_t offset[MAX_MATCHES];
10bea152
JS
540 enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
541 int seen;
542} store;
543
f98d863d
JS
544static int matches(const char* key, const char* value)
545{
546 return !strcmp(key, store.key) &&
547 (store.value_regex == NULL ||
548 (store.do_not_match ^
549 !regexec(store.value_regex, value, 0, NULL, 0)));
550}
551
10bea152
JS
552static int store_aux(const char* key, const char* value)
553{
ae9ee41d
JH
554 const char *ep;
555 size_t section_len;
556
10bea152
JS
557 switch (store.state) {
558 case KEY_SEEN:
f98d863d 559 if (matches(key, value)) {
4ddba79d 560 if (store.seen == 1 && store.multi_replace == 0) {
10bea152
JS
561 fprintf(stderr,
562 "Warning: %s has multiple values\n",
563 key);
4ddba79d
JS
564 } else if (store.seen >= MAX_MATCHES) {
565 fprintf(stderr, "Too many matches\n");
566 return 1;
10bea152 567 }
4ddba79d
JS
568
569 store.offset[store.seen] = ftell(config_file);
10bea152
JS
570 store.seen++;
571 }
572 break;
573 case SECTION_SEEN:
ae9ee41d
JH
574 /*
575 * What we are looking for is in store.key (both
576 * section and var), and its section part is baselen
577 * long. We found key (again, both section and var).
578 * We would want to know if this key is in the same
579 * section as what we are looking for. We already
580 * know we are in the same section as what should
581 * hold store.key.
582 */
583 ep = strrchr(key, '.');
584 section_len = ep - key;
585
586 if ((section_len != store.baselen) ||
587 memcmp(key, store.key, section_len+1)) {
10bea152
JS
588 store.state = SECTION_END_SEEN;
589 break;
ae9ee41d
JH
590 }
591
592 /*
593 * Do not increment matches: this is no match, but we
594 * just made sure we are in the desired section.
595 */
596 store.offset[store.seen] = ftell(config_file);
10bea152
JS
597 /* fallthru */
598 case SECTION_END_SEEN:
599 case START:
f98d863d 600 if (matches(key, value)) {
4ddba79d 601 store.offset[store.seen] = ftell(config_file);
10bea152
JS
602 store.state = KEY_SEEN;
603 store.seen++;
d14f7764
LT
604 } else {
605 if (strrchr(key, '.') - key == store.baselen &&
bdf0ef08 606 !strncmp(key, store.key, store.baselen)) {
93ddef3e 607 store.state = SECTION_SEEN;
bdf0ef08 608 store.offset[store.seen] = ftell(config_file);
d14f7764 609 }
bdf0ef08 610 }
10bea152
JS
611 }
612 return 0;
613}
614
b79d18c9 615static int write_error(void)
480c9e52
AW
616{
617 fprintf(stderr, "Failed to write new configuration file\n");
618
619 /* Same error code as "failed to rename". */
620 return 4;
621}
622
623static int store_write_section(int fd, const char* key)
10bea152 624{
cb891a59
KH
625 const char *dot;
626 int i, success;
627 struct strbuf sb;
d14f7764 628
cb891a59
KH
629 strbuf_init(&sb, 0);
630 dot = memchr(key, '.', store.baselen);
d14f7764 631 if (dot) {
cb891a59
KH
632 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
633 for (i = dot - key + 1; i < store.baselen; i++) {
634 if (key[i] == '"')
635 strbuf_addch(&sb, '\\');
636 strbuf_addch(&sb, key[i]);
d14f7764 637 }
cb891a59
KH
638 strbuf_addstr(&sb, "\"]\n");
639 } else {
640 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
d14f7764
LT
641 }
642
cb891a59
KH
643 success = write_in_full(fd, sb.buf, sb.len) == sb.len;
644 strbuf_release(&sb);
480c9e52 645
cb891a59 646 return success;
10bea152
JS
647}
648
480c9e52 649static int store_write_pair(int fd, const char* key, const char* value)
10bea152 650{
cb891a59
KH
651 int i, success;
652 int length = strlen(key + store.baselen + 1);
653 const char *quote = "";
654 struct strbuf sb;
cdd4fb15 655
6281f394
JM
656 /*
657 * Check to see if the value needs to be surrounded with a dq pair.
658 * Note that problematic characters are always backslash-quoted; this
659 * check is about not losing leading or trailing SP and strings that
660 * follow beginning-of-comment characters (i.e. ';' and '#') by the
661 * configuration parser.
662 */
cdd4fb15 663 if (value[0] == ' ')
cb891a59 664 quote = "\"";
cdd4fb15
BG
665 for (i = 0; value[i]; i++)
666 if (value[i] == ';' || value[i] == '#')
cb891a59
KH
667 quote = "\"";
668 if (i && value[i - 1] == ' ')
669 quote = "\"";
670
671 strbuf_init(&sb, 0);
672 strbuf_addf(&sb, "\t%.*s = %s",
673 length, key + store.baselen + 1, quote);
10bea152 674
10bea152
JS
675 for (i = 0; value[i]; i++)
676 switch (value[i]) {
480c9e52 677 case '\n':
cb891a59 678 strbuf_addstr(&sb, "\\n");
480c9e52
AW
679 break;
680 case '\t':
cb891a59 681 strbuf_addstr(&sb, "\\t");
480c9e52
AW
682 break;
683 case '"':
684 case '\\':
cb891a59 685 strbuf_addch(&sb, '\\');
480c9e52 686 default:
cb891a59 687 strbuf_addch(&sb, value[i]);
480c9e52
AW
688 break;
689 }
cb891a59
KH
690 strbuf_addf(&sb, "%s\n", quote);
691
692 success = write_in_full(fd, sb.buf, sb.len) == sb.len;
693 strbuf_release(&sb);
694
695 return success;
10bea152
JS
696}
697
dc49cd76
SP
698static ssize_t find_beginning_of_line(const char* contents, size_t size,
699 size_t offset_, int* found_bracket)
4ddba79d 700{
dc49cd76
SP
701 size_t equal_offset = size, bracket_offset = size;
702 ssize_t offset;
4ddba79d 703
a6080a0a 704 for (offset = offset_-2; offset > 0
4ddba79d
JS
705 && contents[offset] != '\n'; offset--)
706 switch (contents[offset]) {
707 case '=': equal_offset = offset; break;
708 case ']': bracket_offset = offset; break;
709 }
710 if (bracket_offset < equal_offset) {
711 *found_bracket = 1;
712 offset = bracket_offset+1;
713 } else
714 offset++;
715
716 return offset;
717}
718
10bea152
JS
719int git_config_set(const char* key, const char* value)
720{
4ddba79d 721 return git_config_set_multivar(key, value, NULL, 0);
10bea152
JS
722}
723
724/*
725 * If value==NULL, unset in (remove from) config,
726 * if value_regex!=NULL, disregard key/value pairs where value does not match.
4ddba79d
JS
727 * if multi_replace==0, nothing, or only one matching key/value is replaced,
728 * else all matching key/values (regardless how many) are removed,
729 * before the new pair is written.
10bea152
JS
730 *
731 * Returns 0 on success.
732 *
733 * This function does this:
734 *
735 * - it locks the config file by creating ".git/config.lock"
736 *
737 * - it then parses the config using store_aux() as validator to find
738 * the position on the key/value pair to replace. If it is to be unset,
739 * it must be found exactly once.
740 *
741 * - the config file is mmap()ed and the part before the match (if any) is
742 * written to the lock file, then the changed part and the rest.
743 *
744 * - the config file is removed and the lock file rename()d to it.
745 *
746 */
747int git_config_set_multivar(const char* key, const char* value,
4ddba79d 748 const char* value_regex, int multi_replace)
10bea152 749{
d14f7764 750 int i, dot;
f8ba655e 751 int fd = -1, in_fd;
dafc88b1 752 int ret;
9c3796fc 753 char* config_filename;
6cbf973c 754 struct lock_file *lock = NULL;
b17e659d 755 const char* last_dot = strrchr(key, '.');
4ddba79d 756
d4ebc36c 757 config_filename = getenv(CONFIG_ENVIRONMENT);
9c3796fc 758 if (!config_filename) {
d4ebc36c 759 config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
9c3796fc
JS
760 if (!config_filename)
761 config_filename = git_path("config");
762 }
9befac47 763 config_filename = xstrdup(config_filename);
9c3796fc 764
10bea152
JS
765 /*
766 * Since "key" actually contains the section name and the real
767 * key name separated by a dot, we have to know where the dot is.
768 */
b17e659d 769
dafc88b1 770 if (last_dot == NULL) {
10bea152 771 fprintf(stderr, "key does not contain a section: %s\n", key);
dafc88b1
SH
772 ret = 2;
773 goto out_free;
10bea152 774 }
b17e659d
JS
775 store.baselen = last_dot - key;
776
777 store.multi_replace = multi_replace;
10bea152
JS
778
779 /*
780 * Validate the key and while at it, lower case it for matching.
781 */
2d7320d0 782 store.key = xmalloc(strlen(key) + 1);
d14f7764
LT
783 dot = 0;
784 for (i = 0; key[i]; i++) {
785 unsigned char c = key[i];
786 if (c == '.')
787 dot = 1;
788 /* Leave the extended basename untouched.. */
789 if (!dot || i > store.baselen) {
38c5afa8 790 if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
d14f7764
LT
791 fprintf(stderr, "invalid key: %s\n", key);
792 free(store.key);
793 ret = 1;
794 goto out_free;
795 }
796 c = tolower(c);
6f71686e
JS
797 } else if (c == '\n') {
798 fprintf(stderr, "invalid key (newline): %s\n", key);
799 free(store.key);
800 ret = 1;
801 goto out_free;
d14f7764
LT
802 }
803 store.key[i] = c;
804 }
3dd94e3b 805 store.key[i] = 0;
10bea152
JS
806
807 /*
6cbf973c 808 * The lock serves a purpose in addition to locking: the new
10bea152
JS
809 * contents of .git/config will be written into it.
810 */
6cbf973c
BS
811 lock = xcalloc(sizeof(struct lock_file), 1);
812 fd = hold_lock_file_for_update(lock, config_filename, 0);
813 if (fd < 0) {
10bea152
JS
814 fprintf(stderr, "could not lock config file\n");
815 free(store.key);
dafc88b1
SH
816 ret = -1;
817 goto out_free;
10bea152
JS
818 }
819
820 /*
821 * If .git/config does not exist yet, write a minimal version.
822 */
88fb958b
AR
823 in_fd = open(config_filename, O_RDONLY);
824 if ( in_fd < 0 ) {
10bea152
JS
825 free(store.key);
826
88fb958b
AR
827 if ( ENOENT != errno ) {
828 error("opening %s: %s", config_filename,
829 strerror(errno));
dafc88b1
SH
830 ret = 3; /* same as "invalid config file" */
831 goto out_free;
88fb958b 832 }
10bea152
JS
833 /* if nothing to unset, error out */
834 if (value == NULL) {
dafc88b1
SH
835 ret = 5;
836 goto out_free;
10bea152
JS
837 }
838
839 store.key = (char*)key;
480c9e52 840 if (!store_write_section(fd, key) ||
93c1e079
JH
841 !store_write_pair(fd, key, value))
842 goto write_err_out;
843 } else {
88fb958b 844 struct stat st;
10bea152 845 char* contents;
dc49cd76
SP
846 size_t contents_sz, copy_begin, copy_end;
847 int i, new_line = 0;
10bea152
JS
848
849 if (value_regex == NULL)
850 store.value_regex = NULL;
851 else {
f98d863d
JS
852 if (value_regex[0] == '!') {
853 store.do_not_match = 1;
854 value_regex++;
855 } else
856 store.do_not_match = 0;
857
2d7320d0 858 store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
10bea152
JS
859 if (regcomp(store.value_regex, value_regex,
860 REG_EXTENDED)) {
7246ed43 861 fprintf(stderr, "Invalid pattern: %s\n",
10bea152
JS
862 value_regex);
863 free(store.value_regex);
dafc88b1
SH
864 ret = 6;
865 goto out_free;
10bea152
JS
866 }
867 }
868
4ddba79d 869 store.offset[0] = 0;
10bea152
JS
870 store.state = START;
871 store.seen = 0;
872
873 /*
874 * After this, store.offset will contain the *end* offset
875 * of the last match, or remain at 0 if no match was found.
876 * As a side effect, we make sure to transform only a valid
877 * existing config file.
878 */
9c3796fc 879 if (git_config_from_file(store_aux, config_filename)) {
10bea152
JS
880 fprintf(stderr, "invalid config file\n");
881 free(store.key);
882 if (store.value_regex != NULL) {
883 regfree(store.value_regex);
884 free(store.value_regex);
885 }
dafc88b1
SH
886 ret = 3;
887 goto out_free;
10bea152
JS
888 }
889
890 free(store.key);
891 if (store.value_regex != NULL) {
892 regfree(store.value_regex);
893 free(store.value_regex);
894 }
895
4ddba79d
JS
896 /* if nothing to unset, or too many matches, error out */
897 if ((store.seen == 0 && value == NULL) ||
898 (store.seen > 1 && multi_replace == 0)) {
dafc88b1
SH
899 ret = 5;
900 goto out_free;
10bea152
JS
901 }
902
88fb958b 903 fstat(in_fd, &st);
dc49cd76
SP
904 contents_sz = xsize_t(st.st_size);
905 contents = xmmap(NULL, contents_sz, PROT_READ,
10bea152
JS
906 MAP_PRIVATE, in_fd, 0);
907 close(in_fd);
908
4ddba79d
JS
909 if (store.seen == 0)
910 store.seen = 1;
911
912 for (i = 0, copy_begin = 0; i < store.seen; i++) {
913 if (store.offset[i] == 0) {
dc49cd76 914 store.offset[i] = copy_end = contents_sz;
4ddba79d
JS
915 } else if (store.state != KEY_SEEN) {
916 copy_end = store.offset[i];
10bea152 917 } else
4ddba79d 918 copy_end = find_beginning_of_line(
dc49cd76 919 contents, contents_sz,
4ddba79d
JS
920 store.offset[i]-2, &new_line);
921
02e5ba4a
JK
922 if (copy_end > 0 && contents[copy_end-1] != '\n')
923 new_line = 1;
924
4ddba79d
JS
925 /* write the first part of the config */
926 if (copy_end > copy_begin) {
93c1e079
JH
927 if (write_in_full(fd, contents + copy_begin,
928 copy_end - copy_begin) <
929 copy_end - copy_begin)
930 goto write_err_out;
931 if (new_line &&
932 write_in_full(fd, "\n", 1) != 1)
933 goto write_err_out;
4ddba79d
JS
934 }
935 copy_begin = store.offset[i];
10bea152
JS
936 }
937
10bea152
JS
938 /* write the pair (value == NULL means unset) */
939 if (value != NULL) {
93c1e079
JH
940 if (store.state == START) {
941 if (!store_write_section(fd, key))
942 goto write_err_out;
480c9e52 943 }
93c1e079
JH
944 if (!store_write_pair(fd, key, value))
945 goto write_err_out;
10bea152
JS
946 }
947
948 /* write the rest of the config */
dc49cd76 949 if (copy_begin < contents_sz)
93c1e079 950 if (write_in_full(fd, contents + copy_begin,
dc49cd76
SP
951 contents_sz - copy_begin) <
952 contents_sz - copy_begin)
93c1e079 953 goto write_err_out;
10bea152 954
dc49cd76 955 munmap(contents, contents_sz);
10bea152
JS
956 }
957
4ed7cd3a 958 if (commit_lock_file(lock) < 0) {
6cbf973c 959 fprintf(stderr, "Cannot commit config file!\n");
dafc88b1
SH
960 ret = 4;
961 goto out_free;
10bea152
JS
962 }
963
6cbf973c
BS
964 /*
965 * lock is committed, so don't try to roll it back below.
966 * NOTE: Since lockfile.c keeps a linked list of all created
967 * lock_file structures, it isn't safe to free(lock). It's
968 * better to just leave it hanging around.
969 */
970 lock = NULL;
dafc88b1
SH
971 ret = 0;
972
973out_free:
6cbf973c
BS
974 if (lock)
975 rollback_lock_file(lock);
4cac42b1 976 free(config_filename);
dafc88b1 977 return ret;
93c1e079
JH
978
979write_err_out:
980 ret = write_error();
981 goto out_free;
982
10bea152
JS
983}
984
118f8b24
PB
985static 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
1012/* if new_name == NULL, the section is removed instead */
0667fcfb
JS
1013int git_config_rename_section(const char *old_name, const char *new_name)
1014{
118f8b24 1015 int ret = 0, remove = 0;
fc1905bb 1016 char *config_filename;
0667fcfb
JS
1017 struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1018 int out_fd;
1019 char buf[1024];
1020
d4ebc36c 1021 config_filename = getenv(CONFIG_ENVIRONMENT);
0667fcfb 1022 if (!config_filename) {
d4ebc36c 1023 config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
0667fcfb
JS
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);
fc1905bb
JH
1029 if (out_fd < 0) {
1030 ret = error("Could not lock config file!");
1031 goto out;
1032 }
0667fcfb 1033
fc1905bb 1034 if (!(config_file = fopen(config_filename, "rb"))) {
01ebb9dc
GB
1035 /* no config file means nothing to rename, no error */
1036 goto unlock_and_out;
fc1905bb 1037 }
0667fcfb
JS
1038
1039 while (fgets(buf, sizeof(buf), config_file)) {
1040 int i;
480c9e52 1041 int length;
0667fcfb
JS
1042 for (i = 0; buf[i] && isspace(buf[i]); i++)
1043 ; /* do nothing */
1044 if (buf[i] == '[') {
1045 /* it's a section */
118f8b24
PB
1046 if (section_name_match (&buf[i+1], old_name)) {
1047 ret++;
1048 if (new_name == NULL) {
1049 remove = 1;
0667fcfb
JS
1050 continue;
1051 }
0667fcfb 1052 store.baselen = strlen(new_name);
480c9e52
AW
1053 if (!store_write_section(out_fd, new_name)) {
1054 ret = write_error();
1055 goto out;
1056 }
0667fcfb
JS
1057 continue;
1058 }
118f8b24 1059 remove = 0;
0667fcfb 1060 }
118f8b24
PB
1061 if (remove)
1062 continue;
480c9e52
AW
1063 length = strlen(buf);
1064 if (write_in_full(out_fd, buf, length) != length) {
1065 ret = write_error();
1066 goto out;
1067 }
0667fcfb 1068 }
fc1905bb 1069 fclose(config_file);
01ebb9dc 1070 unlock_and_out:
4ed7cd3a 1071 if (commit_lock_file(lock) < 0)
480c9e52 1072 ret = error("Cannot commit config file!");
fc1905bb
JH
1073 out:
1074 free(config_filename);
0667fcfb
JS
1075 return ret;
1076}