Windows: boost startup by avoiding a static dependency on shell32.dll
[git/dscho.git] / config.c
blobf4f2c59a34cd9fc70db940871caaf00b94a6ef2e
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 "exec_cmd.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 config_file_eof;
17 static int zlib_compression_seen;
19 const char *config_exclusive_filename = NULL;
21 static int get_next_char(void)
23         int c;
24         FILE *f;
26         c = '\n';
27         if ((f = config_file) != NULL) {
28                 c = fgetc(f);
29                 if (c == '\r') {
30                         /* DOS like systems */
31                         c = fgetc(f);
32                         if (c != '\n') {
33                                 ungetc(c, f);
34                                 c = '\r';
35                         }
36                 }
37                 if (c == '\n')
38                         config_linenr++;
39                 if (c == EOF) {
40                         config_file_eof = 1;
41                         c = '\n';
42                 }
43         }
44         return c;
47 static char *parse_value(void)
49         static char value[1024];
50         int quote = 0, comment = 0, len = 0, space = 0;
52         for (;;) {
53                 int c = get_next_char();
54                 if (len >= sizeof(value) - 1)
55                         return NULL;
56                 if (c == '\n') {
57                         if (quote)
58                                 return NULL;
59                         value[len] = 0;
60                         return value;
61                 }
62                 if (comment)
63                         continue;
64                 if (isspace(c) && !quote) {
65                         if (len)
66                                 space++;
67                         continue;
68                 }
69                 if (!quote) {
70                         if (c == ';' || c == '#') {
71                                 comment = 1;
72                                 continue;
73                         }
74                 }
75                 for (; space; space--)
76                         value[len++] = ' ';
77                 if (c == '\\') {
78                         c = get_next_char();
79                         switch (c) {
80                         case '\n':
81                                 continue;
82                         case 't':
83                                 c = '\t';
84                                 break;
85                         case 'b':
86                                 c = '\b';
87                                 break;
88                         case 'n':
89                                 c = '\n';
90                                 break;
91                         /* Some characters escape as themselves */
92                         case '\\': case '"':
93                                 break;
94                         /* Reject unknown escape sequences */
95                         default:
96                                 return NULL;
97                         }
98                         value[len++] = c;
99                         continue;
100                 }
101                 if (c == '"') {
102                         quote = 1-quote;
103                         continue;
104                 }
105                 value[len++] = c;
106         }
109 static inline int iskeychar(int c)
111         return isalnum(c) || c == '-';
114 static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)
116         int c;
117         char *value;
119         /* Get the full name */
120         for (;;) {
121                 c = get_next_char();
122                 if (config_file_eof)
123                         break;
124                 if (!iskeychar(c))
125                         break;
126                 name[len++] = tolower(c);
127                 if (len >= MAXNAME)
128                         return -1;
129         }
130         name[len] = 0;
131         while (c == ' ' || c == '\t')
132                 c = get_next_char();
134         value = NULL;
135         if (c != '\n') {
136                 if (c != '=')
137                         return -1;
138                 value = parse_value();
139                 if (!value)
140                         return -1;
141         }
142         return fn(name, value, data);
145 static int get_extended_base_var(char *name, int baselen, int c)
147         do {
148                 if (c == '\n')
149                         return -1;
150                 c = get_next_char();
151         } while (isspace(c));
153         /* We require the format to be '[base "extension"]' */
154         if (c != '"')
155                 return -1;
156         name[baselen++] = '.';
158         for (;;) {
159                 int c = get_next_char();
160                 if (c == '\n')
161                         return -1;
162                 if (c == '"')
163                         break;
164                 if (c == '\\') {
165                         c = get_next_char();
166                         if (c == '\n')
167                                 return -1;
168                 }
169                 name[baselen++] = c;
170                 if (baselen > MAXNAME / 2)
171                         return -1;
172         }
174         /* Final ']' */
175         if (get_next_char() != ']')
176                 return -1;
177         return baselen;
180 static int get_base_var(char *name)
182         int baselen = 0;
184         for (;;) {
185                 int c = get_next_char();
186                 if (config_file_eof)
187                         return -1;
188                 if (c == ']')
189                         return baselen;
190                 if (isspace(c))
191                         return get_extended_base_var(name, baselen, c);
192                 if (!iskeychar(c) && c != '.')
193                         return -1;
194                 if (baselen > MAXNAME / 2)
195                         return -1;
196                 name[baselen++] = tolower(c);
197         }
200 static int git_parse_file(config_fn_t fn, void *data)
202         int comment = 0;
203         int baselen = 0;
204         static char var[MAXNAME];
206         /* U+FEFF Byte Order Mark in UTF8 */
207         static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
208         const unsigned char *bomptr = utf8_bom;
210         for (;;) {
211                 int c = get_next_char();
212                 if (bomptr && *bomptr) {
213                         /* We are at the file beginning; skip UTF8-encoded BOM
214                          * if present. Sane editors won't put this in on their
215                          * own, but e.g. Windows Notepad will do it happily. */
216                         if ((unsigned char) c == *bomptr) {
217                                 bomptr++;
218                                 continue;
219                         } else {
220                                 /* Do not tolerate partial BOM. */
221                                 if (bomptr != utf8_bom)
222                                         break;
223                                 /* No BOM at file beginning. Cool. */
224                                 bomptr = NULL;
225                         }
226                 }
227                 if (c == '\n') {
228                         if (config_file_eof)
229                                 return 0;
230                         comment = 0;
231                         continue;
232                 }
233                 if (comment || isspace(c))
234                         continue;
235                 if (c == '#' || c == ';') {
236                         comment = 1;
237                         continue;
238                 }
239                 if (c == '[') {
240                         baselen = get_base_var(var);
241                         if (baselen <= 0)
242                                 break;
243                         var[baselen++] = '.';
244                         var[baselen] = 0;
245                         continue;
246                 }
247                 if (!isalpha(c))
248                         break;
249                 var[baselen] = tolower(c);
250                 if (get_value(fn, data, var, baselen+1) < 0)
251                         break;
252         }
253         die("bad config file line %d in %s", config_linenr, config_file_name);
256 static int parse_unit_factor(const char *end, unsigned long *val)
258         if (!*end)
259                 return 1;
260         else if (!strcasecmp(end, "k")) {
261                 *val *= 1024;
262                 return 1;
263         }
264         else if (!strcasecmp(end, "m")) {
265                 *val *= 1024 * 1024;
266                 return 1;
267         }
268         else if (!strcasecmp(end, "g")) {
269                 *val *= 1024 * 1024 * 1024;
270                 return 1;
271         }
272         return 0;
275 static int git_parse_long(const char *value, long *ret)
277         if (value && *value) {
278                 char *end;
279                 long val = strtol(value, &end, 0);
280                 unsigned long factor = 1;
281                 if (!parse_unit_factor(end, &factor))
282                         return 0;
283                 *ret = val * factor;
284                 return 1;
285         }
286         return 0;
289 int git_parse_ulong(const char *value, unsigned long *ret)
291         if (value && *value) {
292                 char *end;
293                 unsigned long val = strtoul(value, &end, 0);
294                 if (!parse_unit_factor(end, &val))
295                         return 0;
296                 *ret = val;
297                 return 1;
298         }
299         return 0;
302 static void die_bad_config(const char *name)
304         if (config_file_name)
305                 die("bad config value for '%s' in %s", name, config_file_name);
306         die("bad config value for '%s'", name);
309 int git_config_int(const char *name, const char *value)
311         long ret = 0;
312         if (!git_parse_long(value, &ret))
313                 die_bad_config(name);
314         return ret;
317 unsigned long git_config_ulong(const char *name, const char *value)
319         unsigned long ret;
320         if (!git_parse_ulong(value, &ret))
321                 die_bad_config(name);
322         return ret;
325 int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
327         *is_bool = 1;
328         if (!value)
329                 return 1;
330         if (!*value)
331                 return 0;
332         if (!strcasecmp(value, "true") || !strcasecmp(value, "yes") || !strcasecmp(value, "on"))
333                 return 1;
334         if (!strcasecmp(value, "false") || !strcasecmp(value, "no") || !strcasecmp(value, "off"))
335                 return 0;
336         *is_bool = 0;
337         return git_config_int(name, value);
340 int git_config_bool(const char *name, const char *value)
342         int discard;
343         return !!git_config_bool_or_int(name, value, &discard);
346 int git_config_string(const char **dest, const char *var, const char *value)
348         if (!value)
349                 return config_error_nonbool(var);
350         *dest = xstrdup(value);
351         return 0;
354 int git_config_pathname(const char **dest, const char *var, const char *value)
356         if (!value)
357                 return config_error_nonbool(var);
358         *dest = expand_user_path(value);
359         if (!*dest)
360                 die("Failed to expand user dir in: '%s'", value);
361         return 0;
364 static int git_default_core_config(const char *var, const char *value)
366         /* This needs a better name */
367         if (!strcmp(var, "core.filemode")) {
368                 trust_executable_bit = git_config_bool(var, value);
369                 return 0;
370         }
371         if (!strcmp(var, "core.trustctime")) {
372                 trust_ctime = git_config_bool(var, value);
373                 return 0;
374         }
376         if (!strcmp(var, "core.quotepath")) {
377                 quote_path_fully = git_config_bool(var, value);
378                 return 0;
379         }
381         if (!strcmp(var, "core.symlinks")) {
382                 has_symlinks = git_config_bool(var, value);
383                 return 0;
384         }
386         if (!strcmp(var, "core.ignorecase")) {
387                 ignore_case = git_config_bool(var, value);
388                 return 0;
389         }
391         if (!strcmp(var, "core.bare")) {
392                 is_bare_repository_cfg = git_config_bool(var, value);
393                 return 0;
394         }
396         if (!strcmp(var, "core.ignorestat")) {
397                 assume_unchanged = git_config_bool(var, value);
398                 return 0;
399         }
401         if (!strcmp(var, "core.prefersymlinkrefs")) {
402                 prefer_symlink_refs = git_config_bool(var, value);
403                 return 0;
404         }
406         if (!strcmp(var, "core.logallrefupdates")) {
407                 log_all_ref_updates = git_config_bool(var, value);
408                 return 0;
409         }
411         if (!strcmp(var, "core.warnambiguousrefs")) {
412                 warn_ambiguous_refs = git_config_bool(var, value);
413                 return 0;
414         }
416         if (!strcmp(var, "core.loosecompression")) {
417                 int level = git_config_int(var, value);
418                 if (level == -1)
419                         level = Z_DEFAULT_COMPRESSION;
420                 else if (level < 0 || level > Z_BEST_COMPRESSION)
421                         die("bad zlib compression level %d", level);
422                 zlib_compression_level = level;
423                 zlib_compression_seen = 1;
424                 return 0;
425         }
427         if (!strcmp(var, "core.compression")) {
428                 int level = git_config_int(var, value);
429                 if (level == -1)
430                         level = Z_DEFAULT_COMPRESSION;
431                 else if (level < 0 || level > Z_BEST_COMPRESSION)
432                         die("bad zlib compression level %d", level);
433                 core_compression_level = level;
434                 core_compression_seen = 1;
435                 if (!zlib_compression_seen)
436                         zlib_compression_level = level;
437                 return 0;
438         }
440         if (!strcmp(var, "core.packedgitwindowsize")) {
441                 int pgsz_x2 = getpagesize() * 2;
442                 packed_git_window_size = git_config_int(var, value);
444                 /* This value must be multiple of (pagesize * 2) */
445                 packed_git_window_size /= pgsz_x2;
446                 if (packed_git_window_size < 1)
447                         packed_git_window_size = 1;
448                 packed_git_window_size *= pgsz_x2;
449                 return 0;
450         }
452         if (!strcmp(var, "core.packedgitlimit")) {
453                 packed_git_limit = git_config_int(var, value);
454                 return 0;
455         }
457         if (!strcmp(var, "core.deltabasecachelimit")) {
458                 delta_base_cache_limit = git_config_int(var, value);
459                 return 0;
460         }
462         if (!strcmp(var, "core.autocrlf")) {
463                 if (value && !strcasecmp(value, "input")) {
464                         auto_crlf = -1;
465                         return 0;
466                 }
467                 auto_crlf = git_config_bool(var, value);
468                 return 0;
469         }
471         if (!strcmp(var, "core.safecrlf")) {
472                 if (value && !strcasecmp(value, "warn")) {
473                         safe_crlf = SAFE_CRLF_WARN;
474                         return 0;
475                 }
476                 safe_crlf = git_config_bool(var, value);
477                 return 0;
478         }
480         if (!strcmp(var, "core.notesref")) {
481                 notes_ref_name = xstrdup(value);
482                 return 0;
483         }
485         if (!strcmp(var, "core.pager"))
486                 return git_config_string(&pager_program, var, value);
488         if (!strcmp(var, "core.editor"))
489                 return git_config_string(&editor_program, var, value);
491         if (!strcmp(var, "core.excludesfile"))
492                 return git_config_pathname(&excludes_file, var, value);
494         if (!strcmp(var, "core.whitespace")) {
495                 if (!value)
496                         return config_error_nonbool(var);
497                 whitespace_rule_cfg = parse_whitespace_rule(value);
498                 return 0;
499         }
501         if (!strcmp(var, "core.fsyncobjectfiles")) {
502                 fsync_object_files = git_config_bool(var, value);
503                 return 0;
504         }
506         if (!strcmp(var, "core.preloadindex")) {
507                 core_preload_index = git_config_bool(var, value);
508                 return 0;
509         }
511         if (!strcmp(var, "core.createobject")) {
512                 if (!strcmp(value, "rename"))
513                         object_creation_mode = OBJECT_CREATION_USES_RENAMES;
514                 else if (!strcmp(value, "link"))
515                         object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
516                 else
517                         die("Invalid mode for object creation: %s", value);
518                 return 0;
519         }
521         if (!strcmp(var, "core.sparsecheckout")) {
522                 core_apply_sparse_checkout = git_config_bool(var, value);
523                 return 0;
524         }
526         /* Add other config variables here and to Documentation/config.txt. */
527         return 0;
530 static int git_default_user_config(const char *var, const char *value)
532         if (!strcmp(var, "user.name")) {
533                 if (!value)
534                         return config_error_nonbool(var);
535                 strlcpy(git_default_name, value, sizeof(git_default_name));
536                 if (git_default_email[0])
537                         user_ident_explicitly_given = 1;
538                 return 0;
539         }
541         if (!strcmp(var, "user.email")) {
542                 if (!value)
543                         return config_error_nonbool(var);
544                 strlcpy(git_default_email, value, sizeof(git_default_email));
545                 if (git_default_name[0])
546                         user_ident_explicitly_given = 1;
547                 return 0;
548         }
550         /* Add other config variables here and to Documentation/config.txt. */
551         return 0;
554 static int git_default_i18n_config(const char *var, const char *value)
556         if (!strcmp(var, "i18n.commitencoding"))
557                 return git_config_string(&git_commit_encoding, var, value);
559         if (!strcmp(var, "i18n.logoutputencoding"))
560                 return git_config_string(&git_log_output_encoding, var, value);
562         /* Add other config variables here and to Documentation/config.txt. */
563         return 0;
566 static int git_default_branch_config(const char *var, const char *value)
568         if (!strcmp(var, "branch.autosetupmerge")) {
569                 if (value && !strcasecmp(value, "always")) {
570                         git_branch_track = BRANCH_TRACK_ALWAYS;
571                         return 0;
572                 }
573                 git_branch_track = git_config_bool(var, value);
574                 return 0;
575         }
576         if (!strcmp(var, "branch.autosetuprebase")) {
577                 if (!value)
578                         return config_error_nonbool(var);
579                 else if (!strcmp(value, "never"))
580                         autorebase = AUTOREBASE_NEVER;
581                 else if (!strcmp(value, "local"))
582                         autorebase = AUTOREBASE_LOCAL;
583                 else if (!strcmp(value, "remote"))
584                         autorebase = AUTOREBASE_REMOTE;
585                 else if (!strcmp(value, "always"))
586                         autorebase = AUTOREBASE_ALWAYS;
587                 else
588                         return error("Malformed value for %s", var);
589                 return 0;
590         }
592         /* Add other config variables here and to Documentation/config.txt. */
593         return 0;
596 static int git_default_push_config(const char *var, const char *value)
598         if (!strcmp(var, "push.default")) {
599                 if (!value)
600                         return config_error_nonbool(var);
601                 else if (!strcmp(value, "nothing"))
602                         push_default = PUSH_DEFAULT_NOTHING;
603                 else if (!strcmp(value, "matching"))
604                         push_default = PUSH_DEFAULT_MATCHING;
605                 else if (!strcmp(value, "tracking"))
606                         push_default = PUSH_DEFAULT_TRACKING;
607                 else if (!strcmp(value, "current"))
608                         push_default = PUSH_DEFAULT_CURRENT;
609                 else {
610                         error("Malformed value for %s: %s", var, value);
611                         return error("Must be one of nothing, matching, "
612                                      "tracking or current.");
613                 }
614                 return 0;
615         }
617         /* Add other config variables here and to Documentation/config.txt. */
618         return 0;
621 static int git_default_mailmap_config(const char *var, const char *value)
623         if (!strcmp(var, "mailmap.file"))
624                 return git_config_string(&git_mailmap_file, var, value);
626         /* Add other config variables here and to Documentation/config.txt. */
627         return 0;
630 int git_default_config(const char *var, const char *value, void *dummy)
632         if (!prefixcmp(var, "core."))
633                 return git_default_core_config(var, value);
635         if (!prefixcmp(var, "user."))
636                 return git_default_user_config(var, value);
638         if (!prefixcmp(var, "i18n."))
639                 return git_default_i18n_config(var, value);
641         if (!prefixcmp(var, "branch."))
642                 return git_default_branch_config(var, value);
644         if (!prefixcmp(var, "push."))
645                 return git_default_push_config(var, value);
647         if (!prefixcmp(var, "mailmap."))
648                 return git_default_mailmap_config(var, value);
650         if (!prefixcmp(var, "advice."))
651                 return git_default_advice_config(var, value);
653         if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
654                 pager_use_color = git_config_bool(var,value);
655                 return 0;
656         }
658         /* Add other config variables here and to Documentation/config.txt. */
659         return 0;
662 int git_config_from_file(config_fn_t fn, const char *filename, void *data)
664         int ret;
665         FILE *f = fopen(filename, "r");
667         ret = -1;
668         if (f) {
669                 config_file = f;
670                 config_file_name = filename;
671                 config_linenr = 1;
672                 config_file_eof = 0;
673                 ret = git_parse_file(fn, data);
674                 fclose(f);
675                 config_file_name = NULL;
676         }
677         return ret;
680 const char *git_etc_gitconfig(void)
682         static const char *system_wide;
683         if (!system_wide)
684                 system_wide = system_path(ETC_GITCONFIG);
685         return system_wide;
688 static int git_env_bool(const char *k, int def)
690         const char *v = getenv(k);
691         return v ? git_config_bool(k, v) : def;
694 int git_config_system(void)
696         return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
699 int git_config_global(void)
701         return !git_env_bool("GIT_CONFIG_NOGLOBAL", 0);
704 int git_config(config_fn_t fn, void *data)
706         int ret = 0, found = 0;
707         char *repo_config = NULL;
708         const char *home = NULL;
710         /* Setting $GIT_CONFIG makes git read _only_ the given config file. */
711         if (config_exclusive_filename)
712                 return git_config_from_file(fn, config_exclusive_filename, data);
713         if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
714                 ret += git_config_from_file(fn, git_etc_gitconfig(),
715                                             data);
716                 found += 1;
717         }
719         home = getenv("HOME");
720         if (git_config_global() && home) {
721                 char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
722                 if (!access(user_config, R_OK)) {
723                         ret += git_config_from_file(fn, user_config, data);
724                         found += 1;
725                 }
726                 free(user_config);
727         }
729         repo_config = git_pathdup("config");
730         if (!access(repo_config, R_OK)) {
731                 ret += git_config_from_file(fn, repo_config, data);
732                 found += 1;
733         }
734         free(repo_config);
735         if (found == 0)
736                 return -1;
737         return ret;
741  * Find all the stuff for git_config_set() below.
742  */
744 #define MAX_MATCHES 512
746 static struct {
747         int baselen;
748         char *key;
749         int do_not_match;
750         regex_t *value_regex;
751         int multi_replace;
752         size_t offset[MAX_MATCHES];
753         enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
754         int seen;
755 } store;
757 static int matches(const char *key, const char *value)
759         return !strcmp(key, store.key) &&
760                 (store.value_regex == NULL ||
761                  (store.do_not_match ^
762                   !regexec(store.value_regex, value, 0, NULL, 0)));
765 static int store_aux(const char *key, const char *value, void *cb)
767         const char *ep;
768         size_t section_len;
770         switch (store.state) {
771         case KEY_SEEN:
772                 if (matches(key, value)) {
773                         if (store.seen == 1 && store.multi_replace == 0) {
774                                 warning("%s has multiple values", key);
775                         } else if (store.seen >= MAX_MATCHES) {
776                                 error("too many matches for %s", key);
777                                 return 1;
778                         }
780                         store.offset[store.seen] = ftell(config_file);
781                         store.seen++;
782                 }
783                 break;
784         case SECTION_SEEN:
785                 /*
786                  * What we are looking for is in store.key (both
787                  * section and var), and its section part is baselen
788                  * long.  We found key (again, both section and var).
789                  * We would want to know if this key is in the same
790                  * section as what we are looking for.  We already
791                  * know we are in the same section as what should
792                  * hold store.key.
793                  */
794                 ep = strrchr(key, '.');
795                 section_len = ep - key;
797                 if ((section_len != store.baselen) ||
798                     memcmp(key, store.key, section_len+1)) {
799                         store.state = SECTION_END_SEEN;
800                         break;
801                 }
803                 /*
804                  * Do not increment matches: this is no match, but we
805                  * just made sure we are in the desired section.
806                  */
807                 store.offset[store.seen] = ftell(config_file);
808                 /* fallthru */
809         case SECTION_END_SEEN:
810         case START:
811                 if (matches(key, value)) {
812                         store.offset[store.seen] = ftell(config_file);
813                         store.state = KEY_SEEN;
814                         store.seen++;
815                 } else {
816                         if (strrchr(key, '.') - key == store.baselen &&
817                               !strncmp(key, store.key, store.baselen)) {
818                                         store.state = SECTION_SEEN;
819                                         store.offset[store.seen] = ftell(config_file);
820                         }
821                 }
822         }
823         return 0;
826 static int write_error(const char *filename)
828         error("failed to write new configuration file %s", filename);
830         /* Same error code as "failed to rename". */
831         return 4;
834 static int store_write_section(int fd, const char *key)
836         const char *dot;
837         int i, success;
838         struct strbuf sb = STRBUF_INIT;
840         dot = memchr(key, '.', store.baselen);
841         if (dot) {
842                 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
843                 for (i = dot - key + 1; i < store.baselen; i++) {
844                         if (key[i] == '"' || key[i] == '\\')
845                                 strbuf_addch(&sb, '\\');
846                         strbuf_addch(&sb, key[i]);
847                 }
848                 strbuf_addstr(&sb, "\"]\n");
849         } else {
850                 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
851         }
853         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
854         strbuf_release(&sb);
856         return success;
859 static int store_write_pair(int fd, const char *key, const char *value)
861         int i, success;
862         int length = strlen(key + store.baselen + 1);
863         const char *quote = "";
864         struct strbuf sb = STRBUF_INIT;
866         /*
867          * Check to see if the value needs to be surrounded with a dq pair.
868          * Note that problematic characters are always backslash-quoted; this
869          * check is about not losing leading or trailing SP and strings that
870          * follow beginning-of-comment characters (i.e. ';' and '#') by the
871          * configuration parser.
872          */
873         if (value[0] == ' ')
874                 quote = "\"";
875         for (i = 0; value[i]; i++)
876                 if (value[i] == ';' || value[i] == '#')
877                         quote = "\"";
878         if (i && value[i - 1] == ' ')
879                 quote = "\"";
881         strbuf_addf(&sb, "\t%.*s = %s",
882                     length, key + store.baselen + 1, quote);
884         for (i = 0; value[i]; i++)
885                 switch (value[i]) {
886                 case '\n':
887                         strbuf_addstr(&sb, "\\n");
888                         break;
889                 case '\t':
890                         strbuf_addstr(&sb, "\\t");
891                         break;
892                 case '"':
893                 case '\\':
894                         strbuf_addch(&sb, '\\');
895                 default:
896                         strbuf_addch(&sb, value[i]);
897                         break;
898                 }
899         strbuf_addf(&sb, "%s\n", quote);
901         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
902         strbuf_release(&sb);
904         return success;
907 static ssize_t find_beginning_of_line(const char *contents, size_t size,
908         size_t offset_, int *found_bracket)
910         size_t equal_offset = size, bracket_offset = size;
911         ssize_t offset;
913 contline:
914         for (offset = offset_-2; offset > 0
915                         && contents[offset] != '\n'; offset--)
916                 switch (contents[offset]) {
917                         case '=': equal_offset = offset; break;
918                         case ']': bracket_offset = offset; break;
919                 }
920         if (offset > 0 && contents[offset-1] == '\\') {
921                 offset_ = offset;
922                 goto contline;
923         }
924         if (bracket_offset < equal_offset) {
925                 *found_bracket = 1;
926                 offset = bracket_offset+1;
927         } else
928                 offset++;
930         return offset;
933 int git_config_set(const char *key, const char *value)
935         return git_config_set_multivar(key, value, NULL, 0);
939  * If value==NULL, unset in (remove from) config,
940  * if value_regex!=NULL, disregard key/value pairs where value does not match.
941  * if multi_replace==0, nothing, or only one matching key/value is replaced,
942  *     else all matching key/values (regardless how many) are removed,
943  *     before the new pair is written.
945  * Returns 0 on success.
947  * This function does this:
949  * - it locks the config file by creating ".git/config.lock"
951  * - it then parses the config using store_aux() as validator to find
952  *   the position on the key/value pair to replace. If it is to be unset,
953  *   it must be found exactly once.
955  * - the config file is mmap()ed and the part before the match (if any) is
956  *   written to the lock file, then the changed part and the rest.
958  * - the config file is removed and the lock file rename()d to it.
960  */
961 int git_config_set_multivar(const char *key, const char *value,
962         const char *value_regex, int multi_replace)
964         int i, dot;
965         int fd = -1, in_fd;
966         int ret;
967         char *config_filename;
968         struct lock_file *lock = NULL;
969         const char *last_dot = strrchr(key, '.');
971         if (config_exclusive_filename)
972                 config_filename = xstrdup(config_exclusive_filename);
973         else
974                 config_filename = git_pathdup("config");
976         /*
977          * Since "key" actually contains the section name and the real
978          * key name separated by a dot, we have to know where the dot is.
979          */
981         if (last_dot == NULL) {
982                 error("key does not contain a section: %s", key);
983                 ret = 2;
984                 goto out_free;
985         }
986         store.baselen = last_dot - key;
988         store.multi_replace = multi_replace;
990         /*
991          * Validate the key and while at it, lower case it for matching.
992          */
993         store.key = xmalloc(strlen(key) + 1);
994         dot = 0;
995         for (i = 0; key[i]; i++) {
996                 unsigned char c = key[i];
997                 if (c == '.')
998                         dot = 1;
999                 /* Leave the extended basename untouched.. */
1000                 if (!dot || i > store.baselen) {
1001                         if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
1002                                 error("invalid key: %s", key);
1003                                 free(store.key);
1004                                 ret = 1;
1005                                 goto out_free;
1006                         }
1007                         c = tolower(c);
1008                 } else if (c == '\n') {
1009                         error("invalid key (newline): %s", key);
1010                         free(store.key);
1011                         ret = 1;
1012                         goto out_free;
1013                 }
1014                 store.key[i] = c;
1015         }
1016         store.key[i] = 0;
1018         /*
1019          * The lock serves a purpose in addition to locking: the new
1020          * contents of .git/config will be written into it.
1021          */
1022         lock = xcalloc(sizeof(struct lock_file), 1);
1023         fd = hold_lock_file_for_update(lock, config_filename, 0);
1024         if (fd < 0) {
1025                 error("could not lock config file %s: %s", config_filename, strerror(errno));
1026                 free(store.key);
1027                 ret = -1;
1028                 goto out_free;
1029         }
1031         /*
1032          * If .git/config does not exist yet, write a minimal version.
1033          */
1034         in_fd = open(config_filename, O_RDONLY);
1035         if ( in_fd < 0 ) {
1036                 free(store.key);
1038                 if ( ENOENT != errno ) {
1039                         error("opening %s: %s", config_filename,
1040                               strerror(errno));
1041                         ret = 3; /* same as "invalid config file" */
1042                         goto out_free;
1043                 }
1044                 /* if nothing to unset, error out */
1045                 if (value == NULL) {
1046                         ret = 5;
1047                         goto out_free;
1048                 }
1050                 store.key = (char *)key;
1051                 if (!store_write_section(fd, key) ||
1052                     !store_write_pair(fd, key, value))
1053                         goto write_err_out;
1054         } else {
1055                 struct stat st;
1056                 char *contents;
1057                 size_t contents_sz, copy_begin, copy_end;
1058                 int i, new_line = 0;
1060                 if (value_regex == NULL)
1061                         store.value_regex = NULL;
1062                 else {
1063                         if (value_regex[0] == '!') {
1064                                 store.do_not_match = 1;
1065                                 value_regex++;
1066                         } else
1067                                 store.do_not_match = 0;
1069                         store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1070                         if (regcomp(store.value_regex, value_regex,
1071                                         REG_EXTENDED)) {
1072                                 error("invalid pattern: %s", value_regex);
1073                                 free(store.value_regex);
1074                                 ret = 6;
1075                                 goto out_free;
1076                         }
1077                 }
1079                 store.offset[0] = 0;
1080                 store.state = START;
1081                 store.seen = 0;
1083                 /*
1084                  * After this, store.offset will contain the *end* offset
1085                  * of the last match, or remain at 0 if no match was found.
1086                  * As a side effect, we make sure to transform only a valid
1087                  * existing config file.
1088                  */
1089                 if (git_config_from_file(store_aux, config_filename, NULL)) {
1090                         error("invalid config file %s", config_filename);
1091                         free(store.key);
1092                         if (store.value_regex != NULL) {
1093                                 regfree(store.value_regex);
1094                                 free(store.value_regex);
1095                         }
1096                         ret = 3;
1097                         goto out_free;
1098                 }
1100                 free(store.key);
1101                 if (store.value_regex != NULL) {
1102                         regfree(store.value_regex);
1103                         free(store.value_regex);
1104                 }
1106                 /* if nothing to unset, or too many matches, error out */
1107                 if ((store.seen == 0 && value == NULL) ||
1108                                 (store.seen > 1 && multi_replace == 0)) {
1109                         ret = 5;
1110                         goto out_free;
1111                 }
1113                 fstat(in_fd, &st);
1114                 contents_sz = xsize_t(st.st_size);
1115                 contents = xmmap(NULL, contents_sz, PROT_READ,
1116                         MAP_PRIVATE, in_fd, 0);
1117                 close(in_fd);
1119                 if (store.seen == 0)
1120                         store.seen = 1;
1122                 for (i = 0, copy_begin = 0; i < store.seen; i++) {
1123                         if (store.offset[i] == 0) {
1124                                 store.offset[i] = copy_end = contents_sz;
1125                         } else if (store.state != KEY_SEEN) {
1126                                 copy_end = store.offset[i];
1127                         } else
1128                                 copy_end = find_beginning_of_line(
1129                                         contents, contents_sz,
1130                                         store.offset[i]-2, &new_line);
1132                         if (copy_end > 0 && contents[copy_end-1] != '\n')
1133                                 new_line = 1;
1135                         /* write the first part of the config */
1136                         if (copy_end > copy_begin) {
1137                                 if (write_in_full(fd, contents + copy_begin,
1138                                                   copy_end - copy_begin) <
1139                                     copy_end - copy_begin)
1140                                         goto write_err_out;
1141                                 if (new_line &&
1142                                     write_str_in_full(fd, "\n") != 1)
1143                                         goto write_err_out;
1144                         }
1145                         copy_begin = store.offset[i];
1146                 }
1148                 /* write the pair (value == NULL means unset) */
1149                 if (value != NULL) {
1150                         if (store.state == START) {
1151                                 if (!store_write_section(fd, key))
1152                                         goto write_err_out;
1153                         }
1154                         if (!store_write_pair(fd, key, value))
1155                                 goto write_err_out;
1156                 }
1158                 /* write the rest of the config */
1159                 if (copy_begin < contents_sz)
1160                         if (write_in_full(fd, contents + copy_begin,
1161                                           contents_sz - copy_begin) <
1162                             contents_sz - copy_begin)
1163                                 goto write_err_out;
1165                 munmap(contents, contents_sz);
1166         }
1168         if (commit_lock_file(lock) < 0) {
1169                 error("could not commit config file %s", config_filename);
1170                 ret = 4;
1171                 goto out_free;
1172         }
1174         /*
1175          * lock is committed, so don't try to roll it back below.
1176          * NOTE: Since lockfile.c keeps a linked list of all created
1177          * lock_file structures, it isn't safe to free(lock).  It's
1178          * better to just leave it hanging around.
1179          */
1180         lock = NULL;
1181         ret = 0;
1183 out_free:
1184         if (lock)
1185                 rollback_lock_file(lock);
1186         free(config_filename);
1187         return ret;
1189 write_err_out:
1190         ret = write_error(lock->filename);
1191         goto out_free;
1195 static int section_name_match (const char *buf, const char *name)
1197         int i = 0, j = 0, dot = 0;
1198         if (buf[i] != '[')
1199                 return 0;
1200         for (i = 1; buf[i] && buf[i] != ']'; i++) {
1201                 if (!dot && isspace(buf[i])) {
1202                         dot = 1;
1203                         if (name[j++] != '.')
1204                                 break;
1205                         for (i++; isspace(buf[i]); i++)
1206                                 ; /* do nothing */
1207                         if (buf[i] != '"')
1208                                 break;
1209                         continue;
1210                 }
1211                 if (buf[i] == '\\' && dot)
1212                         i++;
1213                 else if (buf[i] == '"' && dot) {
1214                         for (i++; isspace(buf[i]); i++)
1215                                 ; /* do_nothing */
1216                         break;
1217                 }
1218                 if (buf[i] != name[j++])
1219                         break;
1220         }
1221         if (buf[i] == ']' && name[j] == 0) {
1222                 /*
1223                  * We match, now just find the right length offset by
1224                  * gobbling up any whitespace after it, as well
1225                  */
1226                 i++;
1227                 for (; buf[i] && isspace(buf[i]); i++)
1228                         ; /* do nothing */
1229                 return i;
1230         }
1231         return 0;
1234 /* if new_name == NULL, the section is removed instead */
1235 int git_config_rename_section(const char *old_name, const char *new_name)
1237         int ret = 0, remove = 0;
1238         char *config_filename;
1239         struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1240         int out_fd;
1241         char buf[1024];
1243         if (config_exclusive_filename)
1244                 config_filename = xstrdup(config_exclusive_filename);
1245         else
1246                 config_filename = git_pathdup("config");
1247         out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1248         if (out_fd < 0) {
1249                 ret = error("could not lock config file %s", config_filename);
1250                 goto out;
1251         }
1253         if (!(config_file = fopen(config_filename, "rb"))) {
1254                 /* no config file means nothing to rename, no error */
1255                 goto unlock_and_out;
1256         }
1258         while (fgets(buf, sizeof(buf), config_file)) {
1259                 int i;
1260                 int length;
1261                 char *output = buf;
1262                 for (i = 0; buf[i] && isspace(buf[i]); i++)
1263                         ; /* do nothing */
1264                 if (buf[i] == '[') {
1265                         /* it's a section */
1266                         int offset = section_name_match(&buf[i], old_name);
1267                         if (offset > 0) {
1268                                 ret++;
1269                                 if (new_name == NULL) {
1270                                         remove = 1;
1271                                         continue;
1272                                 }
1273                                 store.baselen = strlen(new_name);
1274                                 if (!store_write_section(out_fd, new_name)) {
1275                                         ret = write_error(lock->filename);
1276                                         goto out;
1277                                 }
1278                                 /*
1279                                  * We wrote out the new section, with
1280                                  * a newline, now skip the old
1281                                  * section's length
1282                                  */
1283                                 output += offset + i;
1284                                 if (strlen(output) > 0) {
1285                                         /*
1286                                          * More content means there's
1287                                          * a declaration to put on the
1288                                          * next line; indent with a
1289                                          * tab
1290                                          */
1291                                         output -= 1;
1292                                         output[0] = '\t';
1293                                 }
1294                         }
1295                         remove = 0;
1296                 }
1297                 if (remove)
1298                         continue;
1299                 length = strlen(output);
1300                 if (write_in_full(out_fd, output, length) != length) {
1301                         ret = write_error(lock->filename);
1302                         goto out;
1303                 }
1304         }
1305         fclose(config_file);
1306  unlock_and_out:
1307         if (commit_lock_file(lock) < 0)
1308                 ret = error("could not commit config file %s", config_filename);
1309  out:
1310         free(config_filename);
1311         return ret;
1315  * Call this to report error for your variable that should not
1316  * get a boolean value (i.e. "[my] var" means "true").
1317  */
1318 int config_error_nonbool(const char *var)
1320         return error("Missing value for '%s'", var);