Code

Merge branch 'lt/diff' 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_extended_base_var(char *name, int baselen, int c)
139         do {
140                 if (c == '\n')
141                         return -1;
142                 c = get_next_char();
143         } while (isspace(c));
145         /* We require the format to be '[base "extension"]' */
146         if (c != '"')
147                 return -1;
148         name[baselen++] = '.';
150         for (;;) {
151                 int c = get_next_char();
152                 if (c == '\n')
153                         return -1;
154                 if (c == '"')
155                         break;
156                 if (c == '\\') {
157                         c = get_next_char();
158                         if (c == '\n')
159                                 return -1;
160                 }
161                 name[baselen++] = c;
162                 if (baselen > MAXNAME / 2)
163                         return -1;
164         }
166         /* Final ']' */
167         if (get_next_char() != ']')
168                 return -1;
169         return baselen;
172 static int get_base_var(char *name)
174         int baselen = 0;
176         for (;;) {
177                 int c = get_next_char();
178                 if (c == EOF)
179                         return -1;
180                 if (c == ']')
181                         return baselen;
182                 if (isspace(c))
183                         return get_extended_base_var(name, baselen, c);
184                 if (!isalnum(c) && c != '.')
185                         return -1;
186                 if (baselen > MAXNAME / 2)
187                         return -1;
188                 name[baselen++] = tolower(c);
189         }
192 static int git_parse_file(config_fn_t fn)
194         int comment = 0;
195         int baselen = 0;
196         static char var[MAXNAME];
198         for (;;) {
199                 int c = get_next_char();
200                 if (c == '\n') {
201                         /* EOF? */
202                         if (!config_file)
203                                 return 0;
204                         comment = 0;
205                         continue;
206                 }
207                 if (comment || isspace(c))
208                         continue;
209                 if (c == '#' || c == ';') {
210                         comment = 1;
211                         continue;
212                 }
213                 if (c == '[') {
214                         baselen = get_base_var(var);
215                         if (baselen <= 0)
216                                 break;
217                         var[baselen++] = '.';
218                         var[baselen] = 0;
219                         continue;
220                 }
221                 if (!isalpha(c))
222                         break;
223                 var[baselen] = tolower(c);
224                 if (get_value(fn, var, baselen+1) < 0)
225                         break;
226         }
227         die("bad config file line %d in %s", config_linenr, config_file_name);
230 int git_config_int(const char *name, const char *value)
232         if (value && *value) {
233                 char *end;
234                 int val = strtol(value, &end, 0);
235                 if (!*end)
236                         return val;
237         }
238         die("bad config value for '%s' in %s", name, config_file_name);
241 int git_config_bool(const char *name, const char *value)
243         if (!value)
244                 return 1;
245         if (!*value)
246                 return 0;
247         if (!strcasecmp(value, "true"))
248                 return 1;
249         if (!strcasecmp(value, "false"))
250                 return 0;
251         return git_config_int(name, value) != 0;
254 int git_default_config(const char *var, const char *value)
256         /* This needs a better name */
257         if (!strcmp(var, "core.filemode")) {
258                 trust_executable_bit = git_config_bool(var, value);
259                 return 0;
260         }
262         if (!strcmp(var, "core.ignorestat")) {
263                 assume_unchanged = git_config_bool(var, value);
264                 return 0;
265         }
267         if (!strcmp(var, "core.prefersymlinkrefs")) {
268                 prefer_symlink_refs = git_config_bool(var, value);
269                 return 0;
270         }
272         if (!strcmp(var, "core.warnambiguousrefs")) {
273                 warn_ambiguous_refs = git_config_bool(var, value);
274                 return 0;
275         }
277         if (!strcmp(var, "user.name")) {
278                 strncpy(git_default_name, value, sizeof(git_default_name));
279                 return 0;
280         }
282         if (!strcmp(var, "user.email")) {
283                 strncpy(git_default_email, value, sizeof(git_default_email));
284                 return 0;
285         }
287         if (!strcmp(var, "i18n.commitencoding")) {
288                 strncpy(git_commit_encoding, value, sizeof(git_commit_encoding));
289                 return 0;
290         }
292         /* Add other config variables here and to Documentation/config.txt. */
293         return 0;
296 int git_config_from_file(config_fn_t fn, const char *filename)
298         int ret;
299         FILE *f = fopen(filename, "r");
301         ret = -1;
302         if (f) {
303                 config_file = f;
304                 config_file_name = filename;
305                 config_linenr = 1;
306                 ret = git_parse_file(fn);
307                 fclose(f);
308                 config_file_name = NULL;
309         }
310         return ret;
313 int git_config(config_fn_t fn)
315         return git_config_from_file(fn, git_path("config"));
318 /*
319  * Find all the stuff for git_config_set() below.
320  */
322 #define MAX_MATCHES 512
324 static struct {
325         int baselen;
326         char* key;
327         int do_not_match;
328         regex_t* value_regex;
329         int multi_replace;
330         off_t offset[MAX_MATCHES];
331         enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
332         int seen;
333 } store;
335 static int matches(const char* key, const char* value)
337         return !strcmp(key, store.key) &&
338                 (store.value_regex == NULL ||
339                  (store.do_not_match ^
340                   !regexec(store.value_regex, value, 0, NULL, 0)));
343 static int store_aux(const char* key, const char* value)
345         switch (store.state) {
346         case KEY_SEEN:
347                 if (matches(key, value)) {
348                         if (store.seen == 1 && store.multi_replace == 0) {
349                                 fprintf(stderr,
350                                         "Warning: %s has multiple values\n",
351                                         key);
352                         } else if (store.seen >= MAX_MATCHES) {
353                                 fprintf(stderr, "Too many matches\n");
354                                 return 1;
355                         }
357                         store.offset[store.seen] = ftell(config_file);
358                         store.seen++;
359                 }
360                 break;
361         case SECTION_SEEN:
362                 if (strncmp(key, store.key, store.baselen+1)) {
363                         store.state = SECTION_END_SEEN;
364                         break;
365                 } else
366                         /* do not increment matches: this is no match */
367                         store.offset[store.seen] = ftell(config_file);
368                 /* fallthru */
369         case SECTION_END_SEEN:
370         case START:
371                 if (matches(key, value)) {
372                         store.offset[store.seen] = ftell(config_file);
373                         store.state = KEY_SEEN;
374                         store.seen++;
375                 } else {
376                         if (strrchr(key, '.') - key == store.baselen &&
377                               !strncmp(key, store.key, store.baselen)) {
378                                         store.state = SECTION_SEEN;
379                                         store.offset[store.seen] = ftell(config_file);
380                         }
381                 }
382         }
383         return 0;
386 static void store_write_section(int fd, const char* key)
388         const char *dot = strchr(key, '.');
389         int len1 = store.baselen, len2 = -1;
391         dot = strchr(key, '.');
392         if (dot) {
393                 int dotlen = dot - key;
394                 if (dotlen < len1) {
395                         len2 = len1 - dotlen - 1;
396                         len1 = dotlen;
397                 }
398         }
400         write(fd, "[", 1);
401         write(fd, key, len1);
402         if (len2 >= 0) {
403                 write(fd, " \"", 2);
404                 while (--len2 >= 0) {
405                         unsigned char c = *++dot;
406                         if (c == '"')
407                                 write(fd, "\\", 1);
408                         write(fd, &c, 1);
409                 }
410                 write(fd, "\"", 1);
411         }
412         write(fd, "]\n", 2);
415 static void store_write_pair(int fd, const char* key, const char* value)
417         int i;
419         write(fd, "\t", 1);
420         write(fd, key+store.baselen+1,
421                 strlen(key+store.baselen+1));
422         write(fd, " = ", 3);
423         for (i = 0; value[i]; i++)
424                 switch (value[i]) {
425                 case '\n': write(fd, "\\n", 2); break;
426                 case '\t': write(fd, "\\t", 2); break;
427                 case '"': case '\\': write(fd, "\\", 1);
428                 default: write(fd, value+i, 1);
429         }
430         write(fd, "\n", 1);
433 static int find_beginning_of_line(const char* contents, int size,
434         int offset_, int* found_bracket)
436         int equal_offset = size, bracket_offset = size;
437         int offset;
439         for (offset = offset_-2; offset > 0 
440                         && contents[offset] != '\n'; offset--)
441                 switch (contents[offset]) {
442                         case '=': equal_offset = offset; break;
443                         case ']': bracket_offset = offset; break;
444                 }
445         if (bracket_offset < equal_offset) {
446                 *found_bracket = 1;
447                 offset = bracket_offset+1;
448         } else
449                 offset++;
451         return offset;
454 int git_config_set(const char* key, const char* value)
456         return git_config_set_multivar(key, value, NULL, 0);
459 /*
460  * If value==NULL, unset in (remove from) config,
461  * if value_regex!=NULL, disregard key/value pairs where value does not match.
462  * if multi_replace==0, nothing, or only one matching key/value is replaced,
463  *     else all matching key/values (regardless how many) are removed,
464  *     before the new pair is written.
465  *
466  * Returns 0 on success.
467  *
468  * This function does this:
469  *
470  * - it locks the config file by creating ".git/config.lock"
471  *
472  * - it then parses the config using store_aux() as validator to find
473  *   the position on the key/value pair to replace. If it is to be unset,
474  *   it must be found exactly once.
475  *
476  * - the config file is mmap()ed and the part before the match (if any) is
477  *   written to the lock file, then the changed part and the rest.
478  *
479  * - the config file is removed and the lock file rename()d to it.
480  *
481  */
482 int git_config_set_multivar(const char* key, const char* value,
483         const char* value_regex, int multi_replace)
485         int i, dot;
486         int fd = -1, in_fd;
487         int ret;
488         char* config_filename = strdup(git_path("config"));
489         char* lock_file = strdup(git_path("config.lock"));
490         const char* last_dot = strrchr(key, '.');
492         /*
493          * Since "key" actually contains the section name and the real
494          * key name separated by a dot, we have to know where the dot is.
495          */
497         if (last_dot == NULL) {
498                 fprintf(stderr, "key does not contain a section: %s\n", key);
499                 ret = 2;
500                 goto out_free;
501         }
502         store.baselen = last_dot - key;
504         store.multi_replace = multi_replace;
506         /*
507          * Validate the key and while at it, lower case it for matching.
508          */
509         store.key = (char*)malloc(strlen(key)+1);
510         dot = 0;
511         for (i = 0; key[i]; i++) {
512                 unsigned char c = key[i];
513                 if (c == '.')
514                         dot = 1;
515                 /* Leave the extended basename untouched.. */
516                 if (!dot || i > store.baselen) {
517                         if (!isalnum(c) || (i == store.baselen+1 && !isalpha(c))) {
518                                 fprintf(stderr, "invalid key: %s\n", key);
519                                 free(store.key);
520                                 ret = 1;
521                                 goto out_free;
522                         }
523                         c = tolower(c);
524                 }
525                 store.key[i] = c;
526         }
527         store.key[i] = 0;
529         /*
530          * The lock_file serves a purpose in addition to locking: the new
531          * contents of .git/config will be written into it.
532          */
533         fd = open(lock_file, O_WRONLY | O_CREAT | O_EXCL, 0666);
534         if (fd < 0) {
535                 fprintf(stderr, "could not lock config file\n");
536                 free(store.key);
537                 ret = -1;
538                 goto out_free;
539         }
541         /*
542          * If .git/config does not exist yet, write a minimal version.
543          */
544         in_fd = open(config_filename, O_RDONLY);
545         if ( in_fd < 0 ) {
546                 free(store.key);
548                 if ( ENOENT != errno ) {
549                         error("opening %s: %s", config_filename,
550                               strerror(errno));
551                         ret = 3; /* same as "invalid config file" */
552                         goto out_free;
553                 }
554                 /* if nothing to unset, error out */
555                 if (value == NULL) {
556                         ret = 5;
557                         goto out_free;
558                 }
560                 store.key = (char*)key;
561                 store_write_section(fd, key);
562                 store_write_pair(fd, key, value);
563         } else{
564                 struct stat st;
565                 char* contents;
566                 int i, copy_begin, copy_end, new_line = 0;
568                 if (value_regex == NULL)
569                         store.value_regex = NULL;
570                 else {
571                         if (value_regex[0] == '!') {
572                                 store.do_not_match = 1;
573                                 value_regex++;
574                         } else
575                                 store.do_not_match = 0;
577                         store.value_regex = (regex_t*)malloc(sizeof(regex_t));
578                         if (regcomp(store.value_regex, value_regex,
579                                         REG_EXTENDED)) {
580                                 fprintf(stderr, "Invalid pattern: %s\n",
581                                         value_regex);
582                                 free(store.value_regex);
583                                 ret = 6;
584                                 goto out_free;
585                         }
586                 }
588                 store.offset[0] = 0;
589                 store.state = START;
590                 store.seen = 0;
592                 /*
593                  * After this, store.offset will contain the *end* offset
594                  * of the last match, or remain at 0 if no match was found.
595                  * As a side effect, we make sure to transform only a valid
596                  * existing config file.
597                  */
598                 if (git_config(store_aux)) {
599                         fprintf(stderr, "invalid config file\n");
600                         free(store.key);
601                         if (store.value_regex != NULL) {
602                                 regfree(store.value_regex);
603                                 free(store.value_regex);
604                         }
605                         ret = 3;
606                         goto out_free;
607                 }
609                 free(store.key);
610                 if (store.value_regex != NULL) {
611                         regfree(store.value_regex);
612                         free(store.value_regex);
613                 }
615                 /* if nothing to unset, or too many matches, error out */
616                 if ((store.seen == 0 && value == NULL) ||
617                                 (store.seen > 1 && multi_replace == 0)) {
618                         ret = 5;
619                         goto out_free;
620                 }
622                 fstat(in_fd, &st);
623                 contents = mmap(NULL, st.st_size, PROT_READ,
624                         MAP_PRIVATE, in_fd, 0);
625                 close(in_fd);
627                 if (store.seen == 0)
628                         store.seen = 1;
630                 for (i = 0, copy_begin = 0; i < store.seen; i++) {
631                         if (store.offset[i] == 0) {
632                                 store.offset[i] = copy_end = st.st_size;
633                         } else if (store.state != KEY_SEEN) {
634                                 copy_end = store.offset[i];
635                         } else
636                                 copy_end = find_beginning_of_line(
637                                         contents, st.st_size,
638                                         store.offset[i]-2, &new_line);
640                         /* write the first part of the config */
641                         if (copy_end > copy_begin) {
642                                 write(fd, contents + copy_begin,
643                                 copy_end - copy_begin);
644                                 if (new_line)
645                                         write(fd, "\n", 1);
646                         }
647                         copy_begin = store.offset[i];
648                 }
650                 /* write the pair (value == NULL means unset) */
651                 if (value != NULL) {
652                         if (store.state == START)
653                                 store_write_section(fd, key);
654                         store_write_pair(fd, key, value);
655                 }
657                 /* write the rest of the config */
658                 if (copy_begin < st.st_size)
659                         write(fd, contents + copy_begin,
660                                 st.st_size - copy_begin);
662                 munmap(contents, st.st_size);
663                 unlink(config_filename);
664         }
666         if (rename(lock_file, config_filename) < 0) {
667                 fprintf(stderr, "Could not rename the lock file?\n");
668                 ret = 4;
669                 goto out_free;
670         }
672         ret = 0;
674 out_free:
675         if (0 <= fd)
676                 close(fd);
677         if (config_filename)
678                 free(config_filename);
679         if (lock_file) {
680                 unlink(lock_file);
681                 free(lock_file);
682         }
683         return ret;