Code

Merge branch 'jc/grep' into next
[git.git] / config.c
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 <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)
17 {
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';
30                         }
31                 }
32                 if (c == '\n')
33                         config_linenr++;
34                 if (c == EOF) {
35                         config_file = NULL;
36                         c = '\n';
37                 }
38         }
39         return c;
40 }
42 static char *parse_value(void)
43 {
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;
56                 }
57                 if (comment)
58                         continue;
59                 if (isspace(c) && !quote) {
60                         space = 1;
61                         continue;
62                 }
63                 if (!quote) {
64                         if (c == ';' || c == '#') {
65                                 comment = 1;
66                                 continue;
67                         }
68                 }
69                 if (space) {
70                         if (len)
71                                 value[len++] = ' ';
72                         space = 0;
73                 }
74                 if (c == '\\') {
75                         c = get_next_char();
76                         switch (c) {
77                         case '\n':
78                                 continue;
79                         case 't':
80                                 c = '\t';
81                                 break;
82                         case 'b':
83                                 c = '\b';
84                                 break;
85                         case 'n':
86                                 c = '\n';
87                                 break;
88                         /* Some characters escape as themselves */
89                         case '\\': case '"':
90                                 break;
91                         /* Reject unknown escape sequences */
92                         default:
93                                 return NULL;
94                         }
95                         value[len++] = c;
96                         continue;
97                 }
98                 if (c == '"') {
99                         quote = 1-quote;
100                         continue;
101                 }
102                 value[len++] = c;
103         }
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;
121         }
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;
133         }
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);
152         }
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;
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;
186                 var[baselen] = tolower(c);
187                 if (get_value(fn, var, baselen+1) < 0)
188                         break;
189         }
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;
200         }
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;
223         }
225         if (!strcmp(var, "core.ignorestat")) {
226                 assume_unchanged = git_config_bool(var, value);
227                 return 0;
228         }
230         if (!strcmp(var, "core.prefersymlinkrefs")) {
231                 prefer_symlink_refs = git_config_bool(var, value);
232                 return 0;
233         }
235         if (!strcmp(var, "core.warnambiguousrefs")) {
236                 warn_ambiguous_refs = git_config_bool(var, value);
237                 return 0;
238         }
240         if (!strcmp(var, "user.name")) {
241                 strncpy(git_default_name, value, sizeof(git_default_name));
242                 return 0;
243         }
245         if (!strcmp(var, "user.email")) {
246                 strncpy(git_default_email, value, sizeof(git_default_email));
247                 return 0;
248         }
250         if (!strcmp(var, "i18n.commitencoding")) {
251                 strncpy(git_commit_encoding, value, sizeof(git_commit_encoding));
252                 return 0;
253         }
255         /* Add other config variables here and to Documentation/config.txt. */
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;
272         }
273         return ret;
276 int git_config(config_fn_t fn)
278         return git_config_from_file(fn, git_path("config"));
281 /*
282  * Find all the stuff for git_config_set() below.
283  */
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;
318                         }
320                         store.offset[store.seen] = ftell(config_file);
321                         store.seen++;
322                 }
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 (strrchr(key, '.') - key == store.baselen &&
339                               !strncmp(key, store.key, store.baselen)) {
340                                         store.state = SECTION_SEEN;
341                                         store.offset[store.seen] = ftell(config_file);
342                 }
343         }
344         return 0;
347 static void store_write_section(int fd, const char* key)
349         write(fd, "[", 1);
350         write(fd, key, store.baselen);
351         write(fd, "]\n", 2);
354 static void store_write_pair(int fd, const char* key, const char* value)
356         int i;
358         write(fd, "\t", 1);
359         write(fd, key+store.baselen+1,
360                 strlen(key+store.baselen+1));
361         write(fd, " = ", 3);
362         for (i = 0; value[i]; i++)
363                 switch (value[i]) {
364                 case '\n': write(fd, "\\n", 2); break;
365                 case '\t': write(fd, "\\t", 2); break;
366                 case '"': case '\\': write(fd, "\\", 1);
367                 default: write(fd, value+i, 1);
368         }
369         write(fd, "\n", 1);
372 static int find_beginning_of_line(const char* contents, int size,
373         int offset_, int* found_bracket)
375         int equal_offset = size, bracket_offset = size;
376         int offset;
378         for (offset = offset_-2; offset > 0 
379                         && contents[offset] != '\n'; offset--)
380                 switch (contents[offset]) {
381                         case '=': equal_offset = offset; break;
382                         case ']': bracket_offset = offset; break;
383                 }
384         if (bracket_offset < equal_offset) {
385                 *found_bracket = 1;
386                 offset = bracket_offset+1;
387         } else
388                 offset++;
390         return offset;
393 int git_config_set(const char* key, const char* value)
395         return git_config_set_multivar(key, value, NULL, 0);
398 /*
399  * If value==NULL, unset in (remove from) config,
400  * if value_regex!=NULL, disregard key/value pairs where value does not match.
401  * if multi_replace==0, nothing, or only one matching key/value is replaced,
402  *     else all matching key/values (regardless how many) are removed,
403  *     before the new pair is written.
404  *
405  * Returns 0 on success.
406  *
407  * This function does this:
408  *
409  * - it locks the config file by creating ".git/config.lock"
410  *
411  * - it then parses the config using store_aux() as validator to find
412  *   the position on the key/value pair to replace. If it is to be unset,
413  *   it must be found exactly once.
414  *
415  * - the config file is mmap()ed and the part before the match (if any) is
416  *   written to the lock file, then the changed part and the rest.
417  *
418  * - the config file is removed and the lock file rename()d to it.
419  *
420  */
421 int git_config_set_multivar(const char* key, const char* value,
422         const char* value_regex, int multi_replace)
424         int i;
425         int fd = -1, in_fd;
426         int ret;
427         char* config_filename = strdup(git_path("config"));
428         char* lock_file = strdup(git_path("config.lock"));
429         const char* last_dot = strrchr(key, '.');
431         /*
432          * Since "key" actually contains the section name and the real
433          * key name separated by a dot, we have to know where the dot is.
434          */
436         if (last_dot == NULL) {
437                 fprintf(stderr, "key does not contain a section: %s\n", key);
438                 ret = 2;
439                 goto out_free;
440         }
441         store.baselen = last_dot - key;
443         store.multi_replace = multi_replace;
445         /*
446          * Validate the key and while at it, lower case it for matching.
447          */
448         store.key = (char*)malloc(strlen(key)+1);
449         for (i = 0; key[i]; i++)
450                 if (i != store.baselen &&
451                                 ((!isalnum(key[i]) && key[i] != '.') ||
452                                  (i == store.baselen+1 && !isalpha(key[i])))) {
453                         fprintf(stderr, "invalid key: %s\n", key);
454                         free(store.key);
455                         ret = 1;
456                         goto out_free;
457                 } else
458                         store.key[i] = tolower(key[i]);
459         store.key[i] = 0;
461         /*
462          * The lock_file serves a purpose in addition to locking: the new
463          * contents of .git/config will be written into it.
464          */
465         fd = open(lock_file, O_WRONLY | O_CREAT | O_EXCL, 0666);
466         if (fd < 0) {
467                 fprintf(stderr, "could not lock config file\n");
468                 free(store.key);
469                 ret = -1;
470                 goto out_free;
471         }
473         /*
474          * If .git/config does not exist yet, write a minimal version.
475          */
476         in_fd = open(config_filename, O_RDONLY);
477         if ( in_fd < 0 ) {
478                 free(store.key);
480                 if ( ENOENT != errno ) {
481                         error("opening %s: %s", config_filename,
482                               strerror(errno));
483                         ret = 3; /* same as "invalid config file" */
484                         goto out_free;
485                 }
486                 /* if nothing to unset, error out */
487                 if (value == NULL) {
488                         ret = 5;
489                         goto out_free;
490                 }
492                 store.key = (char*)key;
493                 store_write_section(fd, key);
494                 store_write_pair(fd, key, value);
495         } else{
496                 struct stat st;
497                 char* contents;
498                 int i, copy_begin, copy_end, new_line = 0;
500                 if (value_regex == NULL)
501                         store.value_regex = NULL;
502                 else {
503                         if (value_regex[0] == '!') {
504                                 store.do_not_match = 1;
505                                 value_regex++;
506                         } else
507                                 store.do_not_match = 0;
509                         store.value_regex = (regex_t*)malloc(sizeof(regex_t));
510                         if (regcomp(store.value_regex, value_regex,
511                                         REG_EXTENDED)) {
512                                 fprintf(stderr, "Invalid pattern: %s\n",
513                                         value_regex);
514                                 free(store.value_regex);
515                                 ret = 6;
516                                 goto out_free;
517                         }
518                 }
520                 store.offset[0] = 0;
521                 store.state = START;
522                 store.seen = 0;
524                 /*
525                  * After this, store.offset will contain the *end* offset
526                  * of the last match, or remain at 0 if no match was found.
527                  * As a side effect, we make sure to transform only a valid
528                  * existing config file.
529                  */
530                 if (git_config(store_aux)) {
531                         fprintf(stderr, "invalid config file\n");
532                         free(store.key);
533                         if (store.value_regex != NULL) {
534                                 regfree(store.value_regex);
535                                 free(store.value_regex);
536                         }
537                         ret = 3;
538                         goto out_free;
539                 }
541                 free(store.key);
542                 if (store.value_regex != NULL) {
543                         regfree(store.value_regex);
544                         free(store.value_regex);
545                 }
547                 /* if nothing to unset, or too many matches, error out */
548                 if ((store.seen == 0 && value == NULL) ||
549                                 (store.seen > 1 && multi_replace == 0)) {
550                         ret = 5;
551                         goto out_free;
552                 }
554                 fstat(in_fd, &st);
555                 contents = mmap(NULL, st.st_size, PROT_READ,
556                         MAP_PRIVATE, in_fd, 0);
557                 close(in_fd);
559                 if (store.seen == 0)
560                         store.seen = 1;
562                 for (i = 0, copy_begin = 0; i < store.seen; i++) {
563                         if (store.offset[i] == 0) {
564                                 store.offset[i] = copy_end = st.st_size;
565                         } else if (store.state != KEY_SEEN) {
566                                 copy_end = store.offset[i];
567                         } else
568                                 copy_end = find_beginning_of_line(
569                                         contents, st.st_size,
570                                         store.offset[i]-2, &new_line);
572                         /* write the first part of the config */
573                         if (copy_end > copy_begin) {
574                                 write(fd, contents + copy_begin,
575                                 copy_end - copy_begin);
576                                 if (new_line)
577                                         write(fd, "\n", 1);
578                         }
579                         copy_begin = store.offset[i];
580                 }
582                 /* write the pair (value == NULL means unset) */
583                 if (value != NULL) {
584                         if (store.state == START)
585                                 store_write_section(fd, key);
586                         store_write_pair(fd, key, value);
587                 }
589                 /* write the rest of the config */
590                 if (copy_begin < st.st_size)
591                         write(fd, contents + copy_begin,
592                                 st.st_size - copy_begin);
594                 munmap(contents, st.st_size);
595                 unlink(config_filename);
596         }
598         if (rename(lock_file, config_filename) < 0) {
599                 fprintf(stderr, "Could not rename the lock file?\n");
600                 ret = 4;
601                 goto out_free;
602         }
604         ret = 0;
606 out_free:
607         if (0 <= fd)
608                 close(fd);
609         if (config_filename)
610                 free(config_filename);
611         if (lock_file) {
612                 unlink(lock_file);
613                 free(lock_file);
614         }
615         return ret;