Merge git://git.kernel.org/pub/scm/gitk/gitk
[git/gitweb.git] / config.c
blob95ec34923d3fcf4d2a8fa16cbab9a5cbfe8e4f6f
1 /*
2 * GIT - The information manager from hell
4 * Copyright (C) Linus Torvalds, 2005
5 * Copyright (C) Johannes Schindelin, 2005
7 */
8 #include "cache.h"
9 #include <regex.h>
11 #define MAXNAME (256)
13 static FILE *config_file;
14 static const char *config_file_name;
15 static int config_linenr;
16 static int get_next_char(void)
18 int c;
19 FILE *f;
21 c = '\n';
22 if ((f = config_file) != NULL) {
23 c = fgetc(f);
24 if (c == '\r') {
25 /* DOS like systems */
26 c = fgetc(f);
27 if (c != '\n') {
28 ungetc(c, f);
29 c = '\r';
32 if (c == '\n')
33 config_linenr++;
34 if (c == EOF) {
35 config_file = NULL;
36 c = '\n';
39 return c;
42 static char *parse_value(void)
44 static char value[1024];
45 int quote = 0, comment = 0, len = 0, space = 0;
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;
57 if (comment)
58 continue;
59 if (isspace(c) && !quote) {
60 space = 1;
61 continue;
63 if (space) {
64 if (len)
65 value[len++] = ' ';
66 space = 0;
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;
82 /* Some characters escape as themselves */
83 case '\\': case '"':
84 break;
85 /* Reject unknown escape sequences */
86 default:
87 return NULL;
89 value[len++] = c;
90 continue;
92 if (c == '"') {
93 quote = 1-quote;
94 continue;
96 if (!quote) {
97 if (c == ';' || c == '#') {
98 comment = 1;
99 continue;
102 value[len++] = c;
106 static int get_value(config_fn_t fn, char *name, unsigned int len)
108 int c;
109 char *value;
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;
122 name[len] = 0;
123 while (c == ' ' || c == '\t')
124 c = get_next_char();
126 value = NULL;
127 if (c != '\n') {
128 if (c != '=')
129 return -1;
130 value = parse_value();
131 if (!value)
132 return -1;
134 return fn(name, value);
137 static int get_base_var(char *name)
139 int baselen = 0;
141 for (;;) {
142 int c = get_next_char();
143 if (c == EOF)
144 return -1;
145 if (c == ']')
146 return baselen;
147 if (!isalnum(c) && c != '.')
148 return -1;
149 if (baselen > MAXNAME / 2)
150 return -1;
151 name[baselen++] = tolower(c);
155 static int git_parse_file(config_fn_t fn)
157 int comment = 0;
158 int baselen = 0;
159 static char var[MAXNAME];
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;
170 if (comment || isspace(c))
171 continue;
172 if (c == '#' || c == ';') {
173 comment = 1;
174 continue;
176 if (c == '[') {
177 baselen = get_base_var(var);
178 if (baselen <= 0)
179 break;
180 var[baselen++] = '.';
181 var[baselen] = 0;
182 continue;
184 if (!isalpha(c))
185 break;
186 var[baselen] = tolower(c);
187 if (get_value(fn, var, baselen+1) < 0)
188 break;
190 die("bad config file line %d in %s", config_linenr, config_file_name);
193 int git_config_int(const char *name, const char *value)
195 if (value && *value) {
196 char *end;
197 int val = strtol(value, &end, 0);
198 if (!*end)
199 return val;
201 die("bad config value for '%s' in %s", name, config_file_name);
204 int git_config_bool(const char *name, const char *value)
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;
217 int git_default_config(const char *var, const char *value)
219 /* This needs a better name */
220 if (!strcmp(var, "core.filemode")) {
221 trust_executable_bit = git_config_bool(var, value);
222 return 0;
225 if (!strcmp(var, "core.ignorestat")) {
226 assume_unchanged = git_config_bool(var, value);
227 return 0;
230 if (!strcmp(var, "core.symrefsonly")) {
231 only_use_symrefs = git_config_bool(var, value);
232 return 0;
235 if (!strcmp(var, "core.warnambiguousrefs")) {
236 warn_ambiguous_refs = git_config_bool(var, value);
237 return 0;
240 if (!strcmp(var, "user.name")) {
241 strncpy(git_default_name, value, sizeof(git_default_name));
242 return 0;
245 if (!strcmp(var, "user.email")) {
246 strncpy(git_default_email, value, sizeof(git_default_email));
247 return 0;
250 if (!strcmp(var, "i18n.commitencoding")) {
251 strncpy(git_commit_encoding, value, sizeof(git_commit_encoding));
252 return 0;
255 /* Add other config variables here.. */
256 return 0;
259 int git_config_from_file(config_fn_t fn, const char *filename)
261 int ret;
262 FILE *f = fopen(filename, "r");
264 ret = -1;
265 if (f) {
266 config_file = f;
267 config_file_name = filename;
268 config_linenr = 1;
269 ret = git_parse_file(fn);
270 fclose(f);
271 config_file_name = NULL;
273 return ret;
276 int git_config(config_fn_t fn)
278 return git_config_from_file(fn, git_path("config"));
282 * Find all the stuff for git_config_set() below.
285 #define MAX_MATCHES 512
287 static struct {
288 int baselen;
289 char* key;
290 int do_not_match;
291 regex_t* value_regex;
292 int multi_replace;
293 off_t offset[MAX_MATCHES];
294 enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
295 int seen;
296 } store;
298 static int matches(const char* key, const char* value)
300 return !strcmp(key, store.key) &&
301 (store.value_regex == NULL ||
302 (store.do_not_match ^
303 !regexec(store.value_regex, value, 0, NULL, 0)));
306 static int store_aux(const char* key, const char* value)
308 switch (store.state) {
309 case KEY_SEEN:
310 if (matches(key, value)) {
311 if (store.seen == 1 && store.multi_replace == 0) {
312 fprintf(stderr,
313 "Warning: %s has multiple values\n",
314 key);
315 } else if (store.seen >= MAX_MATCHES) {
316 fprintf(stderr, "Too many matches\n");
317 return 1;
320 store.offset[store.seen] = ftell(config_file);
321 store.seen++;
323 break;
324 case SECTION_SEEN:
325 if (strncmp(key, store.key, store.baselen+1)) {
326 store.state = SECTION_END_SEEN;
327 break;
328 } else
329 /* do not increment matches: this is no match */
330 store.offset[store.seen] = ftell(config_file);
331 /* fallthru */
332 case SECTION_END_SEEN:
333 case START:
334 if (matches(key, value)) {
335 store.offset[store.seen] = ftell(config_file);
336 store.state = KEY_SEEN;
337 store.seen++;
338 } else if(!strncmp(key, store.key, store.baselen))
339 store.state = SECTION_SEEN;
341 return 0;
344 static void store_write_section(int fd, const char* key)
346 write(fd, "[", 1);
347 write(fd, key, store.baselen);
348 write(fd, "]\n", 2);
351 static void store_write_pair(int fd, const char* key, const char* value)
353 int i;
355 write(fd, "\t", 1);
356 write(fd, key+store.baselen+1,
357 strlen(key+store.baselen+1));
358 write(fd, " = ", 3);
359 for (i = 0; value[i]; i++)
360 switch (value[i]) {
361 case '\n': write(fd, "\\n", 2); break;
362 case '\t': write(fd, "\\t", 2); break;
363 case '"': case '\\': write(fd, "\\", 1);
364 default: write(fd, value+i, 1);
366 write(fd, "\n", 1);
369 static int find_beginning_of_line(const char* contents, int size,
370 int offset_, int* found_bracket)
372 int equal_offset = size, bracket_offset = size;
373 int offset;
375 for (offset = offset_-2; offset > 0
376 && contents[offset] != '\n'; offset--)
377 switch (contents[offset]) {
378 case '=': equal_offset = offset; break;
379 case ']': bracket_offset = offset; break;
381 if (bracket_offset < equal_offset) {
382 *found_bracket = 1;
383 offset = bracket_offset+1;
384 } else
385 offset++;
387 return offset;
390 int git_config_set(const char* key, const char* value)
392 return git_config_set_multivar(key, value, NULL, 0);
396 * If value==NULL, unset in (remove from) config,
397 * if value_regex!=NULL, disregard key/value pairs where value does not match.
398 * if multi_replace==0, nothing, or only one matching key/value is replaced,
399 * else all matching key/values (regardless how many) are removed,
400 * before the new pair is written.
402 * Returns 0 on success.
404 * This function does this:
406 * - it locks the config file by creating ".git/config.lock"
408 * - it then parses the config using store_aux() as validator to find
409 * the position on the key/value pair to replace. If it is to be unset,
410 * it must be found exactly once.
412 * - the config file is mmap()ed and the part before the match (if any) is
413 * written to the lock file, then the changed part and the rest.
415 * - the config file is removed and the lock file rename()d to it.
418 int git_config_set_multivar(const char* key, const char* value,
419 const char* value_regex, int multi_replace)
421 int i;
422 int fd, in_fd;
423 char* config_filename = strdup(git_path("config"));
424 char* lock_file = strdup(git_path("config.lock"));
425 const char* last_dot = strrchr(key, '.');
428 * Since "key" actually contains the section name and the real
429 * key name separated by a dot, we have to know where the dot is.
432 if (last_dot == NULL) {
433 fprintf(stderr, "key does not contain a section: %s\n", key);
434 return 2;
436 store.baselen = last_dot - key;
438 store.multi_replace = multi_replace;
441 * Validate the key and while at it, lower case it for matching.
443 store.key = (char*)malloc(strlen(key)+1);
444 for (i = 0; key[i]; i++)
445 if (i != store.baselen &&
446 ((!isalnum(key[i]) && key[i] != '.') ||
447 (i == store.baselen+1 && !isalpha(key[i])))) {
448 fprintf(stderr, "invalid key: %s\n", key);
449 free(store.key);
450 return 1;
451 } else
452 store.key[i] = tolower(key[i]);
453 store.key[i] = 0;
456 * The lock_file serves a purpose in addition to locking: the new
457 * contents of .git/config will be written into it.
459 fd = open(lock_file, O_WRONLY | O_CREAT | O_EXCL, 0666);
460 if (fd < 0) {
461 fprintf(stderr, "could not lock config file\n");
462 free(store.key);
463 return -1;
467 * If .git/config does not exist yet, write a minimal version.
469 in_fd = open(config_filename, O_RDONLY);
470 if ( in_fd < 0 ) {
471 free(store.key);
473 if ( ENOENT != errno ) {
474 error("opening %s: %s", config_filename,
475 strerror(errno));
476 close(fd);
477 unlink(lock_file);
478 return 3; /* same as "invalid config file" */
480 /* if nothing to unset, error out */
481 if (value == NULL) {
482 close(fd);
483 unlink(lock_file);
484 return 5;
487 store.key = (char*)key;
488 store_write_section(fd, key);
489 store_write_pair(fd, key, value);
490 } else{
491 struct stat st;
492 char* contents;
493 int i, copy_begin, copy_end, new_line = 0;
495 if (value_regex == NULL)
496 store.value_regex = NULL;
497 else {
498 if (value_regex[0] == '!') {
499 store.do_not_match = 1;
500 value_regex++;
501 } else
502 store.do_not_match = 0;
504 store.value_regex = (regex_t*)malloc(sizeof(regex_t));
505 if (regcomp(store.value_regex, value_regex,
506 REG_EXTENDED)) {
507 fprintf(stderr, "Invalid pattern: %s\n",
508 value_regex);
509 free(store.value_regex);
510 return 6;
514 store.offset[0] = 0;
515 store.state = START;
516 store.seen = 0;
519 * After this, store.offset will contain the *end* offset
520 * of the last match, or remain at 0 if no match was found.
521 * As a side effect, we make sure to transform only a valid
522 * existing config file.
524 if (git_config(store_aux)) {
525 fprintf(stderr, "invalid config file\n");
526 free(store.key);
527 if (store.value_regex != NULL) {
528 regfree(store.value_regex);
529 free(store.value_regex);
531 return 3;
534 free(store.key);
535 if (store.value_regex != NULL) {
536 regfree(store.value_regex);
537 free(store.value_regex);
540 /* if nothing to unset, or too many matches, error out */
541 if ((store.seen == 0 && value == NULL) ||
542 (store.seen > 1 && multi_replace == 0)) {
543 close(fd);
544 unlink(lock_file);
545 return 5;
548 fstat(in_fd, &st);
549 contents = mmap(NULL, st.st_size, PROT_READ,
550 MAP_PRIVATE, in_fd, 0);
551 close(in_fd);
553 if (store.seen == 0)
554 store.seen = 1;
556 for (i = 0, copy_begin = 0; i < store.seen; i++) {
557 if (store.offset[i] == 0) {
558 store.offset[i] = copy_end = st.st_size;
559 } else if (store.state != KEY_SEEN) {
560 copy_end = store.offset[i];
561 } else
562 copy_end = find_beginning_of_line(
563 contents, st.st_size,
564 store.offset[i]-2, &new_line);
566 /* write the first part of the config */
567 if (copy_end > copy_begin) {
568 write(fd, contents + copy_begin,
569 copy_end - copy_begin);
570 if (new_line)
571 write(fd, "\n", 1);
573 copy_begin = store.offset[i];
576 /* write the pair (value == NULL means unset) */
577 if (value != NULL) {
578 if (store.state == START)
579 store_write_section(fd, key);
580 store_write_pair(fd, key, value);
583 /* write the rest of the config */
584 if (copy_begin < st.st_size)
585 write(fd, contents + copy_begin,
586 st.st_size - copy_begin);
588 munmap(contents, st.st_size);
589 unlink(config_filename);
592 close(fd);
594 if (rename(lock_file, config_filename) < 0) {
595 fprintf(stderr, "Could not rename the lock file?\n");
596 return 4;
599 return 0;