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[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") || !strcasecmp(value, "yes"))
248                 return 1;
249         if (!strcasecmp(value, "false") || !strcasecmp(value, "no"))
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.logallrefupdates")) {
273                 log_all_ref_updates = git_config_bool(var, value);
274                 return 0;
275         }
277         if (!strcmp(var, "core.warnambiguousrefs")) {
278                 warn_ambiguous_refs = git_config_bool(var, value);
279                 return 0;
280         }
282         if (!strcmp(var, "core.legacyheaders")) {
283                 use_legacy_headers = git_config_bool(var, value);
284                 return 0;
285         }
287         if (!strcmp(var, "core.compression")) {
288                 int level = git_config_int(var, value);
289                 if (level == -1)
290                         level = Z_DEFAULT_COMPRESSION;
291                 else if (level < 0 || level > Z_BEST_COMPRESSION)
292                         die("bad zlib compression level %d", level);
293                 zlib_compression_level = level;
294                 return 0;
295         }
297         if (!strcmp(var, "user.name")) {
298                 strlcpy(git_default_name, value, sizeof(git_default_name));
299                 return 0;
300         }
302         if (!strcmp(var, "user.email")) {
303                 strlcpy(git_default_email, value, sizeof(git_default_email));
304                 return 0;
305         }
307         if (!strcmp(var, "i18n.commitencoding")) {
308                 strlcpy(git_commit_encoding, value, sizeof(git_commit_encoding));
309                 return 0;
310         }
312         /* Add other config variables here and to Documentation/config.txt. */
313         return 0;
316 int git_config_from_file(config_fn_t fn, const char *filename)
318         int ret;
319         FILE *f = fopen(filename, "r");
321         ret = -1;
322         if (f) {
323                 config_file = f;
324                 config_file_name = filename;
325                 config_linenr = 1;
326                 ret = git_parse_file(fn);
327                 fclose(f);
328                 config_file_name = NULL;
329         }
330         return ret;
333 int git_config(config_fn_t fn)
335         int ret = 0;
336         char *repo_config = NULL;
337         const char *home = NULL, *filename;
339         /* $GIT_CONFIG makes git read _only_ the given config file,
340          * $GIT_CONFIG_LOCAL will make it process it in addition to the
341          * global config file, the same way it would the per-repository
342          * config file otherwise. */
343         filename = getenv("GIT_CONFIG");
344         if (!filename) {
345                 home = getenv("HOME");
346                 filename = getenv("GIT_CONFIG_LOCAL");
347                 if (!filename)
348                         filename = repo_config = strdup(git_path("config"));
349         }
351         if (home) {
352                 char *user_config = strdup(mkpath("%s/.gitconfig", home));
353                 if (!access(user_config, R_OK))
354                         ret = git_config_from_file(fn, user_config);
355                 free(user_config);
356         }
358         ret += git_config_from_file(fn, filename);
359         if (repo_config)
360                 free(repo_config);
361         return ret;
364 /*
365  * Find all the stuff for git_config_set() below.
366  */
368 #define MAX_MATCHES 512
370 static struct {
371         int baselen;
372         char* key;
373         int do_not_match;
374         regex_t* value_regex;
375         int multi_replace;
376         off_t offset[MAX_MATCHES];
377         enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
378         int seen;
379 } store;
381 static int matches(const char* key, const char* value)
383         return !strcmp(key, store.key) &&
384                 (store.value_regex == NULL ||
385                  (store.do_not_match ^
386                   !regexec(store.value_regex, value, 0, NULL, 0)));
389 static int store_aux(const char* key, const char* value)
391         switch (store.state) {
392         case KEY_SEEN:
393                 if (matches(key, value)) {
394                         if (store.seen == 1 && store.multi_replace == 0) {
395                                 fprintf(stderr,
396                                         "Warning: %s has multiple values\n",
397                                         key);
398                         } else if (store.seen >= MAX_MATCHES) {
399                                 fprintf(stderr, "Too many matches\n");
400                                 return 1;
401                         }
403                         store.offset[store.seen] = ftell(config_file);
404                         store.seen++;
405                 }
406                 break;
407         case SECTION_SEEN:
408                 if (strncmp(key, store.key, store.baselen+1)) {
409                         store.state = SECTION_END_SEEN;
410                         break;
411                 } else
412                         /* do not increment matches: this is no match */
413                         store.offset[store.seen] = ftell(config_file);
414                 /* fallthru */
415         case SECTION_END_SEEN:
416         case START:
417                 if (matches(key, value)) {
418                         store.offset[store.seen] = ftell(config_file);
419                         store.state = KEY_SEEN;
420                         store.seen++;
421                 } else {
422                         if (strrchr(key, '.') - key == store.baselen &&
423                               !strncmp(key, store.key, store.baselen)) {
424                                         store.state = SECTION_SEEN;
425                                         store.offset[store.seen] = ftell(config_file);
426                         }
427                 }
428         }
429         return 0;
432 static void store_write_section(int fd, const char* key)
434         const char *dot = strchr(key, '.');
435         int len1 = store.baselen, len2 = -1;
437         dot = strchr(key, '.');
438         if (dot) {
439                 int dotlen = dot - key;
440                 if (dotlen < len1) {
441                         len2 = len1 - dotlen - 1;
442                         len1 = dotlen;
443                 }
444         }
446         write(fd, "[", 1);
447         write(fd, key, len1);
448         if (len2 >= 0) {
449                 write(fd, " \"", 2);
450                 while (--len2 >= 0) {
451                         unsigned char c = *++dot;
452                         if (c == '"')
453                                 write(fd, "\\", 1);
454                         write(fd, &c, 1);
455                 }
456                 write(fd, "\"", 1);
457         }
458         write(fd, "]\n", 2);
461 static void store_write_pair(int fd, const char* key, const char* value)
463         int i;
465         write(fd, "\t", 1);
466         write(fd, key+store.baselen+1,
467                 strlen(key+store.baselen+1));
468         write(fd, " = ", 3);
469         for (i = 0; value[i]; i++)
470                 switch (value[i]) {
471                 case '\n': write(fd, "\\n", 2); break;
472                 case '\t': write(fd, "\\t", 2); break;
473                 case '"': case '\\': write(fd, "\\", 1);
474                 default: write(fd, value+i, 1);
475         }
476         write(fd, "\n", 1);
479 static int find_beginning_of_line(const char* contents, int size,
480         int offset_, int* found_bracket)
482         int equal_offset = size, bracket_offset = size;
483         int offset;
485         for (offset = offset_-2; offset > 0 
486                         && contents[offset] != '\n'; offset--)
487                 switch (contents[offset]) {
488                         case '=': equal_offset = offset; break;
489                         case ']': bracket_offset = offset; break;
490                 }
491         if (bracket_offset < equal_offset) {
492                 *found_bracket = 1;
493                 offset = bracket_offset+1;
494         } else
495                 offset++;
497         return offset;
500 int git_config_set(const char* key, const char* value)
502         return git_config_set_multivar(key, value, NULL, 0);
505 /*
506  * If value==NULL, unset in (remove from) config,
507  * if value_regex!=NULL, disregard key/value pairs where value does not match.
508  * if multi_replace==0, nothing, or only one matching key/value is replaced,
509  *     else all matching key/values (regardless how many) are removed,
510  *     before the new pair is written.
511  *
512  * Returns 0 on success.
513  *
514  * This function does this:
515  *
516  * - it locks the config file by creating ".git/config.lock"
517  *
518  * - it then parses the config using store_aux() as validator to find
519  *   the position on the key/value pair to replace. If it is to be unset,
520  *   it must be found exactly once.
521  *
522  * - the config file is mmap()ed and the part before the match (if any) is
523  *   written to the lock file, then the changed part and the rest.
524  *
525  * - the config file is removed and the lock file rename()d to it.
526  *
527  */
528 int git_config_set_multivar(const char* key, const char* value,
529         const char* value_regex, int multi_replace)
531         int i, dot;
532         int fd = -1, in_fd;
533         int ret;
534         char* config_filename;
535         char* lock_file;
536         const char* last_dot = strrchr(key, '.');
538         config_filename = getenv("GIT_CONFIG");
539         if (!config_filename) {
540                 config_filename = getenv("GIT_CONFIG_LOCAL");
541                 if (!config_filename)
542                         config_filename  = git_path("config");
543         }
544         config_filename = strdup(config_filename);
545         lock_file = strdup(mkpath("%s.lock", config_filename));
547         /*
548          * Since "key" actually contains the section name and the real
549          * key name separated by a dot, we have to know where the dot is.
550          */
552         if (last_dot == NULL) {
553                 fprintf(stderr, "key does not contain a section: %s\n", key);
554                 ret = 2;
555                 goto out_free;
556         }
557         store.baselen = last_dot - key;
559         store.multi_replace = multi_replace;
561         /*
562          * Validate the key and while at it, lower case it for matching.
563          */
564         store.key = (char*)malloc(strlen(key)+1);
565         dot = 0;
566         for (i = 0; key[i]; i++) {
567                 unsigned char c = key[i];
568                 if (c == '.')
569                         dot = 1;
570                 /* Leave the extended basename untouched.. */
571                 if (!dot || i > store.baselen) {
572                         if (!isalnum(c) || (i == store.baselen+1 && !isalpha(c))) {
573                                 fprintf(stderr, "invalid key: %s\n", key);
574                                 free(store.key);
575                                 ret = 1;
576                                 goto out_free;
577                         }
578                         c = tolower(c);
579                 }
580                 store.key[i] = c;
581         }
582         store.key[i] = 0;
584         /*
585          * The lock_file serves a purpose in addition to locking: the new
586          * contents of .git/config will be written into it.
587          */
588         fd = open(lock_file, O_WRONLY | O_CREAT | O_EXCL, 0666);
589         if (fd < 0 || adjust_shared_perm(lock_file)) {
590                 fprintf(stderr, "could not lock config file\n");
591                 free(store.key);
592                 ret = -1;
593                 goto out_free;
594         }
596         /*
597          * If .git/config does not exist yet, write a minimal version.
598          */
599         in_fd = open(config_filename, O_RDONLY);
600         if ( in_fd < 0 ) {
601                 free(store.key);
603                 if ( ENOENT != errno ) {
604                         error("opening %s: %s", config_filename,
605                               strerror(errno));
606                         ret = 3; /* same as "invalid config file" */
607                         goto out_free;
608                 }
609                 /* if nothing to unset, error out */
610                 if (value == NULL) {
611                         ret = 5;
612                         goto out_free;
613                 }
615                 store.key = (char*)key;
616                 store_write_section(fd, key);
617                 store_write_pair(fd, key, value);
618         } else{
619                 struct stat st;
620                 char* contents;
621                 int i, copy_begin, copy_end, new_line = 0;
623                 if (value_regex == NULL)
624                         store.value_regex = NULL;
625                 else {
626                         if (value_regex[0] == '!') {
627                                 store.do_not_match = 1;
628                                 value_regex++;
629                         } else
630                                 store.do_not_match = 0;
632                         store.value_regex = (regex_t*)malloc(sizeof(regex_t));
633                         if (regcomp(store.value_regex, value_regex,
634                                         REG_EXTENDED)) {
635                                 fprintf(stderr, "Invalid pattern: %s\n",
636                                         value_regex);
637                                 free(store.value_regex);
638                                 ret = 6;
639                                 goto out_free;
640                         }
641                 }
643                 store.offset[0] = 0;
644                 store.state = START;
645                 store.seen = 0;
647                 /*
648                  * After this, store.offset will contain the *end* offset
649                  * of the last match, or remain at 0 if no match was found.
650                  * As a side effect, we make sure to transform only a valid
651                  * existing config file.
652                  */
653                 if (git_config_from_file(store_aux, config_filename)) {
654                         fprintf(stderr, "invalid config file\n");
655                         free(store.key);
656                         if (store.value_regex != NULL) {
657                                 regfree(store.value_regex);
658                                 free(store.value_regex);
659                         }
660                         ret = 3;
661                         goto out_free;
662                 }
664                 free(store.key);
665                 if (store.value_regex != NULL) {
666                         regfree(store.value_regex);
667                         free(store.value_regex);
668                 }
670                 /* if nothing to unset, or too many matches, error out */
671                 if ((store.seen == 0 && value == NULL) ||
672                                 (store.seen > 1 && multi_replace == 0)) {
673                         ret = 5;
674                         goto out_free;
675                 }
677                 fstat(in_fd, &st);
678                 contents = mmap(NULL, st.st_size, PROT_READ,
679                         MAP_PRIVATE, in_fd, 0);
680                 close(in_fd);
682                 if (store.seen == 0)
683                         store.seen = 1;
685                 for (i = 0, copy_begin = 0; i < store.seen; i++) {
686                         if (store.offset[i] == 0) {
687                                 store.offset[i] = copy_end = st.st_size;
688                         } else if (store.state != KEY_SEEN) {
689                                 copy_end = store.offset[i];
690                         } else
691                                 copy_end = find_beginning_of_line(
692                                         contents, st.st_size,
693                                         store.offset[i]-2, &new_line);
695                         /* write the first part of the config */
696                         if (copy_end > copy_begin) {
697                                 write(fd, contents + copy_begin,
698                                 copy_end - copy_begin);
699                                 if (new_line)
700                                         write(fd, "\n", 1);
701                         }
702                         copy_begin = store.offset[i];
703                 }
705                 /* write the pair (value == NULL means unset) */
706                 if (value != NULL) {
707                         if (store.state == START)
708                                 store_write_section(fd, key);
709                         store_write_pair(fd, key, value);
710                 }
712                 /* write the rest of the config */
713                 if (copy_begin < st.st_size)
714                         write(fd, contents + copy_begin,
715                                 st.st_size - copy_begin);
717                 munmap(contents, st.st_size);
718                 unlink(config_filename);
719         }
721         if (rename(lock_file, config_filename) < 0) {
722                 fprintf(stderr, "Could not rename the lock file?\n");
723                 ret = 4;
724                 goto out_free;
725         }
727         ret = 0;
729 out_free:
730         if (0 <= fd)
731                 close(fd);
732         if (config_filename)
733                 free(config_filename);
734         if (lock_file) {
735                 unlink(lock_file);
736                 free(lock_file);
737         }
738         return ret;