Fix gitk this->selected diffs
[git/git.git] / config.c
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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"
10bea152 9#include <regex.h>
17712991
LT
10
11#define MAXNAME (256)
12
13static FILE *config_file;
4f629539 14static char *config_file_name;
17712991
LT
15static int config_linenr;
16static int get_next_char(void)
17{
18 int c;
19 FILE *f;
20
21 c = '\n';
22 if ((f = config_file) != NULL) {
23 c = fgetc(f);
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24 if (c == '\r') {
25 /* DOS like systems */
26 c = fgetc(f);
27 if (c != '\n') {
28 ungetc(c, f);
29 c = '\r';
30 }
31 }
17712991
LT
32 if (c == '\n')
33 config_linenr++;
34 if (c == EOF) {
35 config_file = NULL;
36 c = '\n';
37 }
38 }
39 return c;
40}
41
42static char *parse_value(void)
43{
44 static char value[1024];
45 int quote = 0, comment = 0, len = 0, space = 0;
46
47 for (;;) {
48 int c = get_next_char();
49 if (len >= sizeof(value))
50 return NULL;
51 if (c == '\n') {
52 if (quote)
53 return NULL;
54 value[len] = 0;
55 return value;
56 }
57 if (comment)
58 continue;
59 if (isspace(c) && !quote) {
60 space = 1;
61 continue;
62 }
63 if (space) {
64 if (len)
65 value[len++] = ' ';
66 space = 0;
67 }
68 if (c == '\\') {
69 c = get_next_char();
70 switch (c) {
71 case '\n':
72 continue;
73 case 't':
74 c = '\t';
75 break;
76 case 'b':
77 c = '\b';
78 break;
79 case 'n':
80 c = '\n';
81 break;
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LT
82 /* Some characters escape as themselves */
83 case '\\': case '"':
84 break;
85 /* Reject unknown escape sequences */
86 default:
87 return NULL;
17712991
LT
88 }
89 value[len++] = c;
90 continue;
91 }
92 if (c == '"') {
93 quote = 1-quote;
94 continue;
95 }
96 if (!quote) {
97 if (c == ';' || c == '#') {
98 comment = 1;
99 continue;
100 }
101 }
102 value[len++] = c;
103 }
104}
105
106static int get_value(config_fn_t fn, char *name, unsigned int len)
107{
108 int c;
109 char *value;
110
111 /* Get the full name */
112 for (;;) {
113 c = get_next_char();
114 if (c == EOF)
115 break;
116 if (!isalnum(c))
117 break;
118 name[len++] = tolower(c);
119 if (len >= MAXNAME)
120 return -1;
121 }
122 name[len] = 0;
123 while (c == ' ' || c == '\t')
124 c = get_next_char();
125
126 value = NULL;
127 if (c != '\n') {
128 if (c != '=')
129 return -1;
130 value = parse_value();
131 if (!value)
132 return -1;
133 }
134 return fn(name, value);
135}
136
137static int get_base_var(char *name)
138{
139 int baselen = 0;
140
141 for (;;) {
142 int c = get_next_char();
143 if (c == EOF)
144 return -1;
145 if (c == ']')
146 return baselen;
b17e659d 147 if (!isalnum(c) && c != '.')
17712991
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148 return -1;
149 if (baselen > MAXNAME / 2)
150 return -1;
151 name[baselen++] = tolower(c);
152 }
153}
154
155static int git_parse_file(config_fn_t fn)
156{
157 int comment = 0;
158 int baselen = 0;
159 static char var[MAXNAME];
160
161 for (;;) {
162 int c = get_next_char();
163 if (c == '\n') {
164 /* EOF? */
165 if (!config_file)
166 return 0;
167 comment = 0;
168 continue;
169 }
170 if (comment || isspace(c))
171 continue;
172 if (c == '#' || c == ';') {
173 comment = 1;
174 continue;
175 }
176 if (c == '[') {
177 baselen = get_base_var(var);
178 if (baselen <= 0)
179 break;
180 var[baselen++] = '.';
181 var[baselen] = 0;
182 continue;
183 }
184 if (!isalpha(c))
185 break;
128af9d1 186 var[baselen] = tolower(c);
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187 if (get_value(fn, var, baselen+1) < 0)
188 break;
189 }
4f629539 190 die("bad config file line %d in %s", config_linenr, config_file_name);
17712991
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191}
192
193int git_config_int(const char *name, const char *value)
194{
195 if (value && *value) {
196 char *end;
197 int val = strtol(value, &end, 0);
198 if (!*end)
199 return val;
200 }
4f629539 201 die("bad config value for '%s' in %s", name, config_file_name);
17712991
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202}
203
204int git_config_bool(const char *name, const char *value)
205{
206 if (!value)
207 return 1;
208 if (!*value)
209 return 0;
210 if (!strcasecmp(value, "true"))
211 return 1;
212 if (!strcasecmp(value, "false"))
213 return 0;
214 return git_config_int(name, value) != 0;
215}
216
217int git_default_config(const char *var, const char *value)
218{
219 /* This needs a better name */
220 if (!strcmp(var, "core.filemode")) {
221 trust_executable_bit = git_config_bool(var, value);
222 return 0;
223 }
224
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225 if (!strcmp(var, "core.symrefsonly")) {
226 only_use_symrefs = git_config_bool(var, value);
227 return 0;
228 }
229
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230 if (!strcmp(var, "user.name")) {
231 strncpy(git_default_name, value, sizeof(git_default_name));
232 return 0;
233 }
234
235 if (!strcmp(var, "user.email")) {
236 strncpy(git_default_email, value, sizeof(git_default_email));
237 return 0;
238 }
239
17712991
LT
240 /* Add other config variables here.. */
241 return 0;
242}
243
4f629539 244int git_config_from_file(config_fn_t fn, const char *filename)
17712991
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245{
246 int ret;
4f629539 247 FILE *f = fopen(filename, "r");
17712991
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248
249 ret = -1;
250 if (f) {
251 config_file = f;
4f629539 252 config_file_name = filename;
17712991
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253 config_linenr = 1;
254 ret = git_parse_file(fn);
255 fclose(f);
4f629539 256 config_file_name = NULL;
17712991
LT
257 }
258 return ret;
259}
10bea152 260
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261int git_config(config_fn_t fn)
262{
263 return git_config_from_file(fn, git_path("config"));
264}
265
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266/*
267 * Find all the stuff for git_config_set() below.
268 */
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269
270#define MAX_MATCHES 512
271
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272static struct {
273 int baselen;
274 char* key;
f98d863d 275 int do_not_match;
10bea152 276 regex_t* value_regex;
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277 int multi_replace;
278 off_t offset[MAX_MATCHES];
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279 enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
280 int seen;
281} store;
282
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283static int matches(const char* key, const char* value)
284{
285 return !strcmp(key, store.key) &&
286 (store.value_regex == NULL ||
287 (store.do_not_match ^
288 !regexec(store.value_regex, value, 0, NULL, 0)));
289}
290
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291static int store_aux(const char* key, const char* value)
292{
293 switch (store.state) {
294 case KEY_SEEN:
f98d863d 295 if (matches(key, value)) {
4ddba79d 296 if (store.seen == 1 && store.multi_replace == 0) {
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297 fprintf(stderr,
298 "Warning: %s has multiple values\n",
299 key);
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300 } else if (store.seen >= MAX_MATCHES) {
301 fprintf(stderr, "Too many matches\n");
302 return 1;
10bea152 303 }
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304
305 store.offset[store.seen] = ftell(config_file);
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306 store.seen++;
307 }
308 break;
309 case SECTION_SEEN:
310 if (strncmp(key, store.key, store.baselen+1)) {
311 store.state = SECTION_END_SEEN;
312 break;
313 } else
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314 /* do not increment matches: this is no match */
315 store.offset[store.seen] = ftell(config_file);
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316 /* fallthru */
317 case SECTION_END_SEEN:
318 case START:
f98d863d 319 if (matches(key, value)) {
4ddba79d 320 store.offset[store.seen] = ftell(config_file);
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321 store.state = KEY_SEEN;
322 store.seen++;
323 } else if(!strncmp(key, store.key, store.baselen))
324 store.state = SECTION_SEEN;
325 }
326 return 0;
327}
328
329static void store_write_section(int fd, const char* key)
330{
331 write(fd, "[", 1);
332 write(fd, key, store.baselen);
333 write(fd, "]\n", 2);
334}
335
336static void store_write_pair(int fd, const char* key, const char* value)
337{
338 int i;
339
340 write(fd, "\t", 1);
341 write(fd, key+store.baselen+1,
342 strlen(key+store.baselen+1));
343 write(fd, " = ", 3);
344 for (i = 0; value[i]; i++)
345 switch (value[i]) {
346 case '\n': write(fd, "\\n", 2); break;
347 case '\t': write(fd, "\\t", 2); break;
348 case '"': case '\\': write(fd, "\\", 1);
349 default: write(fd, value+i, 1);
350 }
351 write(fd, "\n", 1);
352}
353
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354static int find_beginning_of_line(const char* contents, int size,
355 int offset_, int* found_bracket)
356{
357 int equal_offset = size, bracket_offset = size;
358 int offset;
359
360 for (offset = offset_-2; offset > 0
361 && contents[offset] != '\n'; offset--)
362 switch (contents[offset]) {
363 case '=': equal_offset = offset; break;
364 case ']': bracket_offset = offset; break;
365 }
366 if (bracket_offset < equal_offset) {
367 *found_bracket = 1;
368 offset = bracket_offset+1;
369 } else
370 offset++;
371
372 return offset;
373}
374
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375int git_config_set(const char* key, const char* value)
376{
4ddba79d 377 return git_config_set_multivar(key, value, NULL, 0);
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378}
379
380/*
381 * If value==NULL, unset in (remove from) config,
382 * if value_regex!=NULL, disregard key/value pairs where value does not match.
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383 * if multi_replace==0, nothing, or only one matching key/value is replaced,
384 * else all matching key/values (regardless how many) are removed,
385 * before the new pair is written.
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386 *
387 * Returns 0 on success.
388 *
389 * This function does this:
390 *
391 * - it locks the config file by creating ".git/config.lock"
392 *
393 * - it then parses the config using store_aux() as validator to find
394 * the position on the key/value pair to replace. If it is to be unset,
395 * it must be found exactly once.
396 *
397 * - the config file is mmap()ed and the part before the match (if any) is
398 * written to the lock file, then the changed part and the rest.
399 *
400 * - the config file is removed and the lock file rename()d to it.
401 *
402 */
403int git_config_set_multivar(const char* key, const char* value,
4ddba79d 404 const char* value_regex, int multi_replace)
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405{
406 int i;
407 struct stat st;
408 int fd;
3a2f2bb3 409 char* config_filename = strdup(git_path("config"));
10bea152 410 char* lock_file = strdup(git_path("config.lock"));
b17e659d 411 const char* last_dot = strrchr(key, '.');
4ddba79d 412
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413 /*
414 * Since "key" actually contains the section name and the real
415 * key name separated by a dot, we have to know where the dot is.
416 */
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417
418 if (last_dot == NULL) {
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419 fprintf(stderr, "key does not contain a section: %s\n", key);
420 return 2;
421 }
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422 store.baselen = last_dot - key;
423
424 store.multi_replace = multi_replace;
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425
426 /*
427 * Validate the key and while at it, lower case it for matching.
428 */
429 store.key = (char*)malloc(strlen(key)+1);
430 for (i = 0; key[i]; i++)
b17e659d
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431 if (i != store.baselen &&
432 ((!isalnum(key[i]) && key[i] != '.') ||
433 (i == store.baselen+1 && !isalpha(key[i])))) {
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434 fprintf(stderr, "invalid key: %s\n", key);
435 free(store.key);
436 return 1;
437 } else
438 store.key[i] = tolower(key[i]);
3dd94e3b 439 store.key[i] = 0;
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440
441 /*
442 * The lock_file serves a purpose in addition to locking: the new
443 * contents of .git/config will be written into it.
444 */
445 fd = open(lock_file, O_WRONLY | O_CREAT | O_EXCL, 0666);
446 if (fd < 0) {
447 fprintf(stderr, "could not lock config file\n");
448 free(store.key);
449 return -1;
450 }
451
452 /*
453 * If .git/config does not exist yet, write a minimal version.
454 */
3a2f2bb3 455 if (stat(config_filename, &st)) {
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456 static const char contents[] =
457 "#\n"
458 "# This is the config file\n"
459 "#\n"
460 "\n";
461
462 free(store.key);
463
464 /* if nothing to unset, error out */
465 if (value == NULL) {
466 close(fd);
467 unlink(lock_file);
468 return 5;
469 }
470
471 store.key = (char*)key;
472
473 write(fd, contents, sizeof(contents)-1);
474 store_write_section(fd, key);
475 store_write_pair(fd, key, value);
476 } else{
477 int in_fd;
478 char* contents;
4ddba79d 479 int i, copy_begin, copy_end, new_line = 0;
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480
481 if (value_regex == NULL)
482 store.value_regex = NULL;
483 else {
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484 if (value_regex[0] == '!') {
485 store.do_not_match = 1;
486 value_regex++;
487 } else
488 store.do_not_match = 0;
489
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490 store.value_regex = (regex_t*)malloc(sizeof(regex_t));
491 if (regcomp(store.value_regex, value_regex,
492 REG_EXTENDED)) {
493 fprintf(stderr, "Invalid pattern: %s",
494 value_regex);
495 free(store.value_regex);
496 return 6;
497 }
498 }
499
4ddba79d 500 store.offset[0] = 0;
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501 store.state = START;
502 store.seen = 0;
503
504 /*
505 * After this, store.offset will contain the *end* offset
506 * of the last match, or remain at 0 if no match was found.
507 * As a side effect, we make sure to transform only a valid
508 * existing config file.
509 */
510 if (git_config(store_aux)) {
511 fprintf(stderr, "invalid config file\n");
512 free(store.key);
513 if (store.value_regex != NULL) {
514 regfree(store.value_regex);
515 free(store.value_regex);
516 }
517 return 3;
518 }
519
520 free(store.key);
521 if (store.value_regex != NULL) {
522 regfree(store.value_regex);
523 free(store.value_regex);
524 }
525
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526 /* if nothing to unset, or too many matches, error out */
527 if ((store.seen == 0 && value == NULL) ||
528 (store.seen > 1 && multi_replace == 0)) {
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529 close(fd);
530 unlink(lock_file);
531 return 5;
532 }
533
3a2f2bb3 534 in_fd = open(config_filename, O_RDONLY, 0666);
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535 contents = mmap(NULL, st.st_size, PROT_READ,
536 MAP_PRIVATE, in_fd, 0);
537 close(in_fd);
538
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539 if (store.seen == 0)
540 store.seen = 1;
541
542 for (i = 0, copy_begin = 0; i < store.seen; i++) {
543 if (store.offset[i] == 0) {
544 store.offset[i] = copy_end = st.st_size;
545 } else if (store.state != KEY_SEEN) {
546 copy_end = store.offset[i];
10bea152 547 } else
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548 copy_end = find_beginning_of_line(
549 contents, st.st_size,
550 store.offset[i]-2, &new_line);
551
552 /* write the first part of the config */
553 if (copy_end > copy_begin) {
554 write(fd, contents + copy_begin,
555 copy_end - copy_begin);
556 if (new_line)
557 write(fd, "\n", 1);
558 }
559 copy_begin = store.offset[i];
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560 }
561
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562 /* write the pair (value == NULL means unset) */
563 if (value != NULL) {
564 if (store.state == START)
565 store_write_section(fd, key);
566 store_write_pair(fd, key, value);
567 }
568
569 /* write the rest of the config */
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570 if (copy_begin < st.st_size)
571 write(fd, contents + copy_begin,
572 st.st_size - copy_begin);
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573
574 munmap(contents, st.st_size);
3a2f2bb3 575 unlink(config_filename);
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576 }
577
578 close(fd);
579
3a2f2bb3 580 if (rename(lock_file, config_filename) < 0) {
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581 fprintf(stderr, "Could not rename the lock file?\n");
582 return 4;
583 }
584
585 return 0;
586}
587
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