Code

Makefile: install 'git' in execdir
[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 "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)
22 {
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;
45 }
47 static char *parse_value(void)
48 {
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                         space = 1;
66                         continue;
67                 }
68                 if (!quote) {
69                         if (c == ';' || c == '#') {
70                                 comment = 1;
71                                 continue;
72                         }
73                 }
74                 if (space) {
75                         if (len)
76                                 value[len++] = ' ';
77                         space = 0;
78                 }
79                 if (c == '\\') {
80                         c = get_next_char();
81                         switch (c) {
82                         case '\n':
83                                 continue;
84                         case 't':
85                                 c = '\t';
86                                 break;
87                         case 'b':
88                                 c = '\b';
89                                 break;
90                         case 'n':
91                                 c = '\n';
92                                 break;
93                         /* Some characters escape as themselves */
94                         case '\\': case '"':
95                                 break;
96                         /* Reject unknown escape sequences */
97                         default:
98                                 return NULL;
99                         }
100                         value[len++] = c;
101                         continue;
102                 }
103                 if (c == '"') {
104                         quote = 1-quote;
105                         continue;
106                 }
107                 value[len++] = c;
108         }
111 static inline int iskeychar(int c)
113         return isalnum(c) || c == '-';
116 static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)
118         int c;
119         char *value;
121         /* Get the full name */
122         for (;;) {
123                 c = get_next_char();
124                 if (config_file_eof)
125                         break;
126                 if (!iskeychar(c))
127                         break;
128                 name[len++] = tolower(c);
129                 if (len >= MAXNAME)
130                         return -1;
131         }
132         name[len] = 0;
133         while (c == ' ' || c == '\t')
134                 c = get_next_char();
136         value = NULL;
137         if (c != '\n') {
138                 if (c != '=')
139                         return -1;
140                 value = parse_value();
141                 if (!value)
142                         return -1;
143         }
144         return fn(name, value, data);
147 static int get_extended_base_var(char *name, int baselen, int c)
149         do {
150                 if (c == '\n')
151                         return -1;
152                 c = get_next_char();
153         } while (isspace(c));
155         /* We require the format to be '[base "extension"]' */
156         if (c != '"')
157                 return -1;
158         name[baselen++] = '.';
160         for (;;) {
161                 int c = get_next_char();
162                 if (c == '\n')
163                         return -1;
164                 if (c == '"')
165                         break;
166                 if (c == '\\') {
167                         c = get_next_char();
168                         if (c == '\n')
169                                 return -1;
170                 }
171                 name[baselen++] = c;
172                 if (baselen > MAXNAME / 2)
173                         return -1;
174         }
176         /* Final ']' */
177         if (get_next_char() != ']')
178                 return -1;
179         return baselen;
182 static int get_base_var(char *name)
184         int baselen = 0;
186         for (;;) {
187                 int c = get_next_char();
188                 if (config_file_eof)
189                         return -1;
190                 if (c == ']')
191                         return baselen;
192                 if (isspace(c))
193                         return get_extended_base_var(name, baselen, c);
194                 if (!iskeychar(c) && c != '.')
195                         return -1;
196                 if (baselen > MAXNAME / 2)
197                         return -1;
198                 name[baselen++] = tolower(c);
199         }
202 static int git_parse_file(config_fn_t fn, void *data)
204         int comment = 0;
205         int baselen = 0;
206         static char var[MAXNAME];
208         /* U+FEFF Byte Order Mark in UTF8 */
209         static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
210         const unsigned char *bomptr = utf8_bom;
212         for (;;) {
213                 int c = get_next_char();
214                 if (bomptr && *bomptr) {
215                         /* We are at the file beginning; skip UTF8-encoded BOM
216                          * if present. Sane editors won't put this in on their
217                          * own, but e.g. Windows Notepad will do it happily. */
218                         if ((unsigned char) c == *bomptr) {
219                                 bomptr++;
220                                 continue;
221                         } else {
222                                 /* Do not tolerate partial BOM. */
223                                 if (bomptr != utf8_bom)
224                                         break;
225                                 /* No BOM at file beginning. Cool. */
226                                 bomptr = NULL;
227                         }
228                 }
229                 if (c == '\n') {
230                         if (config_file_eof)
231                                 return 0;
232                         comment = 0;
233                         continue;
234                 }
235                 if (comment || isspace(c))
236                         continue;
237                 if (c == '#' || c == ';') {
238                         comment = 1;
239                         continue;
240                 }
241                 if (c == '[') {
242                         baselen = get_base_var(var);
243                         if (baselen <= 0)
244                                 break;
245                         var[baselen++] = '.';
246                         var[baselen] = 0;
247                         continue;
248                 }
249                 if (!isalpha(c))
250                         break;
251                 var[baselen] = tolower(c);
252                 if (get_value(fn, data, var, baselen+1) < 0)
253                         break;
254         }
255         die("bad config file line %d in %s", config_linenr, config_file_name);
258 static int parse_unit_factor(const char *end, unsigned long *val)
260         if (!*end)
261                 return 1;
262         else if (!strcasecmp(end, "k")) {
263                 *val *= 1024;
264                 return 1;
265         }
266         else if (!strcasecmp(end, "m")) {
267                 *val *= 1024 * 1024;
268                 return 1;
269         }
270         else if (!strcasecmp(end, "g")) {
271                 *val *= 1024 * 1024 * 1024;
272                 return 1;
273         }
274         return 0;
277 static int git_parse_long(const char *value, long *ret)
279         if (value && *value) {
280                 char *end;
281                 long val = strtol(value, &end, 0);
282                 unsigned long factor = 1;
283                 if (!parse_unit_factor(end, &factor))
284                         return 0;
285                 *ret = val * factor;
286                 return 1;
287         }
288         return 0;
291 int git_parse_ulong(const char *value, unsigned long *ret)
293         if (value && *value) {
294                 char *end;
295                 unsigned long val = strtoul(value, &end, 0);
296                 if (!parse_unit_factor(end, &val))
297                         return 0;
298                 *ret = val;
299                 return 1;
300         }
301         return 0;
304 static void die_bad_config(const char *name)
306         if (config_file_name)
307                 die("bad config value for '%s' in %s", name, config_file_name);
308         die("bad config value for '%s'", name);
311 int git_config_int(const char *name, const char *value)
313         long ret = 0;
314         if (!git_parse_long(value, &ret))
315                 die_bad_config(name);
316         return ret;
319 unsigned long git_config_ulong(const char *name, const char *value)
321         unsigned long ret;
322         if (!git_parse_ulong(value, &ret))
323                 die_bad_config(name);
324         return ret;
327 int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
329         *is_bool = 1;
330         if (!value)
331                 return 1;
332         if (!*value)
333                 return 0;
334         if (!strcasecmp(value, "true") || !strcasecmp(value, "yes") || !strcasecmp(value, "on"))
335                 return 1;
336         if (!strcasecmp(value, "false") || !strcasecmp(value, "no") || !strcasecmp(value, "off"))
337                 return 0;
338         *is_bool = 0;
339         return git_config_int(name, value);
342 int git_config_bool(const char *name, const char *value)
344         int discard;
345         return !!git_config_bool_or_int(name, value, &discard);
348 int git_config_string(const char **dest, const char *var, const char *value)
350         if (!value)
351                 return config_error_nonbool(var);
352         *dest = xstrdup(value);
353         return 0;
356 static int git_default_core_config(const char *var, const char *value)
358         /* This needs a better name */
359         if (!strcmp(var, "core.filemode")) {
360                 trust_executable_bit = git_config_bool(var, value);
361                 return 0;
362         }
363         if (!strcmp(var, "core.trustctime")) {
364                 trust_ctime = git_config_bool(var, value);
365                 return 0;
366         }
368         if (!strcmp(var, "core.quotepath")) {
369                 quote_path_fully = git_config_bool(var, value);
370                 return 0;
371         }
373         if (!strcmp(var, "core.symlinks")) {
374                 has_symlinks = git_config_bool(var, value);
375                 return 0;
376         }
378         if (!strcmp(var, "core.ignorecase")) {
379                 ignore_case = git_config_bool(var, value);
380                 return 0;
381         }
383         if (!strcmp(var, "core.bare")) {
384                 is_bare_repository_cfg = git_config_bool(var, value);
385                 return 0;
386         }
388         if (!strcmp(var, "core.ignorestat")) {
389                 assume_unchanged = git_config_bool(var, value);
390                 return 0;
391         }
393         if (!strcmp(var, "core.prefersymlinkrefs")) {
394                 prefer_symlink_refs = git_config_bool(var, value);
395                 return 0;
396         }
398         if (!strcmp(var, "core.logallrefupdates")) {
399                 log_all_ref_updates = git_config_bool(var, value);
400                 return 0;
401         }
403         if (!strcmp(var, "core.warnambiguousrefs")) {
404                 warn_ambiguous_refs = git_config_bool(var, value);
405                 return 0;
406         }
408         if (!strcmp(var, "core.loosecompression")) {
409                 int level = git_config_int(var, value);
410                 if (level == -1)
411                         level = Z_DEFAULT_COMPRESSION;
412                 else if (level < 0 || level > Z_BEST_COMPRESSION)
413                         die("bad zlib compression level %d", level);
414                 zlib_compression_level = level;
415                 zlib_compression_seen = 1;
416                 return 0;
417         }
419         if (!strcmp(var, "core.compression")) {
420                 int level = git_config_int(var, value);
421                 if (level == -1)
422                         level = Z_DEFAULT_COMPRESSION;
423                 else if (level < 0 || level > Z_BEST_COMPRESSION)
424                         die("bad zlib compression level %d", level);
425                 core_compression_level = level;
426                 core_compression_seen = 1;
427                 if (!zlib_compression_seen)
428                         zlib_compression_level = level;
429                 return 0;
430         }
432         if (!strcmp(var, "core.packedgitwindowsize")) {
433                 int pgsz_x2 = getpagesize() * 2;
434                 packed_git_window_size = git_config_int(var, value);
436                 /* This value must be multiple of (pagesize * 2) */
437                 packed_git_window_size /= pgsz_x2;
438                 if (packed_git_window_size < 1)
439                         packed_git_window_size = 1;
440                 packed_git_window_size *= pgsz_x2;
441                 return 0;
442         }
444         if (!strcmp(var, "core.packedgitlimit")) {
445                 packed_git_limit = git_config_int(var, value);
446                 return 0;
447         }
449         if (!strcmp(var, "core.deltabasecachelimit")) {
450                 delta_base_cache_limit = git_config_int(var, value);
451                 return 0;
452         }
454         if (!strcmp(var, "core.autocrlf")) {
455                 if (value && !strcasecmp(value, "input")) {
456                         auto_crlf = -1;
457                         return 0;
458                 }
459                 auto_crlf = git_config_bool(var, value);
460                 return 0;
461         }
463         if (!strcmp(var, "core.safecrlf")) {
464                 if (value && !strcasecmp(value, "warn")) {
465                         safe_crlf = SAFE_CRLF_WARN;
466                         return 0;
467                 }
468                 safe_crlf = git_config_bool(var, value);
469                 return 0;
470         }
472         if (!strcmp(var, "core.pager"))
473                 return git_config_string(&pager_program, var, value);
475         if (!strcmp(var, "core.editor"))
476                 return git_config_string(&editor_program, var, value);
478         if (!strcmp(var, "core.excludesfile"))
479                 return git_config_string(&excludes_file, var, value);
481         if (!strcmp(var, "core.whitespace")) {
482                 if (!value)
483                         return config_error_nonbool(var);
484                 whitespace_rule_cfg = parse_whitespace_rule(value);
485                 return 0;
486         }
488         if (!strcmp(var, "core.fsyncobjectfiles")) {
489                 fsync_object_files = git_config_bool(var, value);
490                 return 0;
491         }
493         if (!strcmp(var, "core.preloadindex")) {
494                 core_preload_index = git_config_bool(var, value);
495                 return 0;
496         }
498         if (!strcmp(var, "core.createobject")) {
499                 if (!strcmp(value, "rename"))
500                         object_creation_mode = OBJECT_CREATION_USES_RENAMES;
501                 else if (!strcmp(value, "link"))
502                         object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
503                 else
504                         die("Invalid mode for object creation: %s", value);
505                 return 0;
506         }
508         /* Add other config variables here and to Documentation/config.txt. */
509         return 0;
512 static int git_default_user_config(const char *var, const char *value)
514         if (!strcmp(var, "user.name")) {
515                 if (!value)
516                         return config_error_nonbool(var);
517                 strlcpy(git_default_name, value, sizeof(git_default_name));
518                 if (git_default_email[0])
519                         user_ident_explicitly_given = 1;
520                 return 0;
521         }
523         if (!strcmp(var, "user.email")) {
524                 if (!value)
525                         return config_error_nonbool(var);
526                 strlcpy(git_default_email, value, sizeof(git_default_email));
527                 if (git_default_name[0])
528                         user_ident_explicitly_given = 1;
529                 return 0;
530         }
532         /* Add other config variables here and to Documentation/config.txt. */
533         return 0;
536 static int git_default_i18n_config(const char *var, const char *value)
538         if (!strcmp(var, "i18n.commitencoding"))
539                 return git_config_string(&git_commit_encoding, var, value);
541         if (!strcmp(var, "i18n.logoutputencoding"))
542                 return git_config_string(&git_log_output_encoding, var, value);
544         /* Add other config variables here and to Documentation/config.txt. */
545         return 0;
548 static int git_default_branch_config(const char *var, const char *value)
550         if (!strcmp(var, "branch.autosetupmerge")) {
551                 if (value && !strcasecmp(value, "always")) {
552                         git_branch_track = BRANCH_TRACK_ALWAYS;
553                         return 0;
554                 }
555                 git_branch_track = git_config_bool(var, value);
556                 return 0;
557         }
558         if (!strcmp(var, "branch.autosetuprebase")) {
559                 if (!value)
560                         return config_error_nonbool(var);
561                 else if (!strcmp(value, "never"))
562                         autorebase = AUTOREBASE_NEVER;
563                 else if (!strcmp(value, "local"))
564                         autorebase = AUTOREBASE_LOCAL;
565                 else if (!strcmp(value, "remote"))
566                         autorebase = AUTOREBASE_REMOTE;
567                 else if (!strcmp(value, "always"))
568                         autorebase = AUTOREBASE_ALWAYS;
569                 else
570                         return error("Malformed value for %s", var);
571                 return 0;
572         }
574         /* Add other config variables here and to Documentation/config.txt. */
575         return 0;
578 static int git_default_push_config(const char *var, const char *value)
580         if (!strcmp(var, "push.default")) {
581                 if (!value)
582                         return config_error_nonbool(var);
583                 else if (!strcmp(value, "nothing"))
584                         push_default = PUSH_DEFAULT_NOTHING;
585                 else if (!strcmp(value, "matching"))
586                         push_default = PUSH_DEFAULT_MATCHING;
587                 else if (!strcmp(value, "tracking"))
588                         push_default = PUSH_DEFAULT_TRACKING;
589                 else if (!strcmp(value, "current"))
590                         push_default = PUSH_DEFAULT_CURRENT;
591                 else {
592                         error("Malformed value for %s: %s", var, value);
593                         return error("Must be one of nothing, matching, "
594                                      "tracking or current.");
595                 }
596                 return 0;
597         }
599         /* Add other config variables here and to Documentation/config.txt. */
600         return 0;
603 static int git_default_mailmap_config(const char *var, const char *value)
605         if (!strcmp(var, "mailmap.file"))
606                 return git_config_string(&git_mailmap_file, var, value);
608         /* Add other config variables here and to Documentation/config.txt. */
609         return 0;
612 int git_default_config(const char *var, const char *value, void *dummy)
614         if (!prefixcmp(var, "core."))
615                 return git_default_core_config(var, value);
617         if (!prefixcmp(var, "user."))
618                 return git_default_user_config(var, value);
620         if (!prefixcmp(var, "i18n."))
621                 return git_default_i18n_config(var, value);
623         if (!prefixcmp(var, "branch."))
624                 return git_default_branch_config(var, value);
626         if (!prefixcmp(var, "push."))
627                 return git_default_push_config(var, value);
629         if (!prefixcmp(var, "mailmap."))
630                 return git_default_mailmap_config(var, value);
632         if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
633                 pager_use_color = git_config_bool(var,value);
634                 return 0;
635         }
637         /* Add other config variables here and to Documentation/config.txt. */
638         return 0;
641 int git_config_from_file(config_fn_t fn, const char *filename, void *data)
643         int ret;
644         FILE *f = fopen(filename, "r");
646         ret = -1;
647         if (f) {
648                 config_file = f;
649                 config_file_name = filename;
650                 config_linenr = 1;
651                 config_file_eof = 0;
652                 ret = git_parse_file(fn, data);
653                 fclose(f);
654                 config_file_name = NULL;
655         }
656         return ret;
659 const char *git_etc_gitconfig(void)
661         static const char *system_wide;
662         if (!system_wide)
663                 system_wide = system_path(ETC_GITCONFIG);
664         return system_wide;
667 static int git_env_bool(const char *k, int def)
669         const char *v = getenv(k);
670         return v ? git_config_bool(k, v) : def;
673 int git_config_system(void)
675         return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
678 int git_config_global(void)
680         return !git_env_bool("GIT_CONFIG_NOGLOBAL", 0);
683 int git_config(config_fn_t fn, void *data)
685         int ret = 0, found = 0;
686         char *repo_config = NULL;
687         const char *home = NULL;
689         /* Setting $GIT_CONFIG makes git read _only_ the given config file. */
690         if (config_exclusive_filename)
691                 return git_config_from_file(fn, config_exclusive_filename, data);
692         if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
693                 ret += git_config_from_file(fn, git_etc_gitconfig(),
694                                             data);
695                 found += 1;
696         }
698         home = getenv("HOME");
699         if (git_config_global() && home) {
700                 char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
701                 if (!access(user_config, R_OK)) {
702                         ret += git_config_from_file(fn, user_config, data);
703                         found += 1;
704                 }
705                 free(user_config);
706         }
708         repo_config = git_pathdup("config");
709         if (!access(repo_config, R_OK)) {
710                 ret += git_config_from_file(fn, repo_config, data);
711                 found += 1;
712         }
713         free(repo_config);
714         if (found == 0)
715                 return -1;
716         return ret;
719 /*
720  * Find all the stuff for git_config_set() below.
721  */
723 #define MAX_MATCHES 512
725 static struct {
726         int baselen;
727         char *key;
728         int do_not_match;
729         regex_t *value_regex;
730         int multi_replace;
731         size_t offset[MAX_MATCHES];
732         enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
733         int seen;
734 } store;
736 static int matches(const char *key, const char *value)
738         return !strcmp(key, store.key) &&
739                 (store.value_regex == NULL ||
740                  (store.do_not_match ^
741                   !regexec(store.value_regex, value, 0, NULL, 0)));
744 static int store_aux(const char *key, const char *value, void *cb)
746         const char *ep;
747         size_t section_len;
749         switch (store.state) {
750         case KEY_SEEN:
751                 if (matches(key, value)) {
752                         if (store.seen == 1 && store.multi_replace == 0) {
753                                 warning("%s has multiple values", key);
754                         } else if (store.seen >= MAX_MATCHES) {
755                                 error("too many matches for %s", key);
756                                 return 1;
757                         }
759                         store.offset[store.seen] = ftell(config_file);
760                         store.seen++;
761                 }
762                 break;
763         case SECTION_SEEN:
764                 /*
765                  * What we are looking for is in store.key (both
766                  * section and var), and its section part is baselen
767                  * long.  We found key (again, both section and var).
768                  * We would want to know if this key is in the same
769                  * section as what we are looking for.  We already
770                  * know we are in the same section as what should
771                  * hold store.key.
772                  */
773                 ep = strrchr(key, '.');
774                 section_len = ep - key;
776                 if ((section_len != store.baselen) ||
777                     memcmp(key, store.key, section_len+1)) {
778                         store.state = SECTION_END_SEEN;
779                         break;
780                 }
782                 /*
783                  * Do not increment matches: this is no match, but we
784                  * just made sure we are in the desired section.
785                  */
786                 store.offset[store.seen] = ftell(config_file);
787                 /* fallthru */
788         case SECTION_END_SEEN:
789         case START:
790                 if (matches(key, value)) {
791                         store.offset[store.seen] = ftell(config_file);
792                         store.state = KEY_SEEN;
793                         store.seen++;
794                 } else {
795                         if (strrchr(key, '.') - key == store.baselen &&
796                               !strncmp(key, store.key, store.baselen)) {
797                                         store.state = SECTION_SEEN;
798                                         store.offset[store.seen] = ftell(config_file);
799                         }
800                 }
801         }
802         return 0;
805 static int write_error(const char *filename)
807         error("failed to write new configuration file %s", filename);
809         /* Same error code as "failed to rename". */
810         return 4;
813 static int store_write_section(int fd, const char *key)
815         const char *dot;
816         int i, success;
817         struct strbuf sb = STRBUF_INIT;
819         dot = memchr(key, '.', store.baselen);
820         if (dot) {
821                 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
822                 for (i = dot - key + 1; i < store.baselen; i++) {
823                         if (key[i] == '"' || key[i] == '\\')
824                                 strbuf_addch(&sb, '\\');
825                         strbuf_addch(&sb, key[i]);
826                 }
827                 strbuf_addstr(&sb, "\"]\n");
828         } else {
829                 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
830         }
832         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
833         strbuf_release(&sb);
835         return success;
838 static int store_write_pair(int fd, const char *key, const char *value)
840         int i, success;
841         int length = strlen(key + store.baselen + 1);
842         const char *quote = "";
843         struct strbuf sb = STRBUF_INIT;
845         /*
846          * Check to see if the value needs to be surrounded with a dq pair.
847          * Note that problematic characters are always backslash-quoted; this
848          * check is about not losing leading or trailing SP and strings that
849          * follow beginning-of-comment characters (i.e. ';' and '#') by the
850          * configuration parser.
851          */
852         if (value[0] == ' ')
853                 quote = "\"";
854         for (i = 0; value[i]; i++)
855                 if (value[i] == ';' || value[i] == '#')
856                         quote = "\"";
857         if (i && value[i - 1] == ' ')
858                 quote = "\"";
860         strbuf_addf(&sb, "\t%.*s = %s",
861                     length, key + store.baselen + 1, quote);
863         for (i = 0; value[i]; i++)
864                 switch (value[i]) {
865                 case '\n':
866                         strbuf_addstr(&sb, "\\n");
867                         break;
868                 case '\t':
869                         strbuf_addstr(&sb, "\\t");
870                         break;
871                 case '"':
872                 case '\\':
873                         strbuf_addch(&sb, '\\');
874                 default:
875                         strbuf_addch(&sb, value[i]);
876                         break;
877                 }
878         strbuf_addf(&sb, "%s\n", quote);
880         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
881         strbuf_release(&sb);
883         return success;
886 static ssize_t find_beginning_of_line(const char *contents, size_t size,
887         size_t offset_, int *found_bracket)
889         size_t equal_offset = size, bracket_offset = size;
890         ssize_t offset;
892 contline:
893         for (offset = offset_-2; offset > 0
894                         && contents[offset] != '\n'; offset--)
895                 switch (contents[offset]) {
896                         case '=': equal_offset = offset; break;
897                         case ']': bracket_offset = offset; break;
898                 }
899         if (offset > 0 && contents[offset-1] == '\\') {
900                 offset_ = offset;
901                 goto contline;
902         }
903         if (bracket_offset < equal_offset) {
904                 *found_bracket = 1;
905                 offset = bracket_offset+1;
906         } else
907                 offset++;
909         return offset;
912 int git_config_set(const char *key, const char *value)
914         return git_config_set_multivar(key, value, NULL, 0);
917 /*
918  * If value==NULL, unset in (remove from) config,
919  * if value_regex!=NULL, disregard key/value pairs where value does not match.
920  * if multi_replace==0, nothing, or only one matching key/value is replaced,
921  *     else all matching key/values (regardless how many) are removed,
922  *     before the new pair is written.
923  *
924  * Returns 0 on success.
925  *
926  * This function does this:
927  *
928  * - it locks the config file by creating ".git/config.lock"
929  *
930  * - it then parses the config using store_aux() as validator to find
931  *   the position on the key/value pair to replace. If it is to be unset,
932  *   it must be found exactly once.
933  *
934  * - the config file is mmap()ed and the part before the match (if any) is
935  *   written to the lock file, then the changed part and the rest.
936  *
937  * - the config file is removed and the lock file rename()d to it.
938  *
939  */
940 int git_config_set_multivar(const char *key, const char *value,
941         const char *value_regex, int multi_replace)
943         int i, dot;
944         int fd = -1, in_fd;
945         int ret;
946         char *config_filename;
947         struct lock_file *lock = NULL;
948         const char *last_dot = strrchr(key, '.');
950         if (config_exclusive_filename)
951                 config_filename = xstrdup(config_exclusive_filename);
952         else
953                 config_filename = git_pathdup("config");
955         /*
956          * Since "key" actually contains the section name and the real
957          * key name separated by a dot, we have to know where the dot is.
958          */
960         if (last_dot == NULL) {
961                 error("key does not contain a section: %s", key);
962                 ret = 2;
963                 goto out_free;
964         }
965         store.baselen = last_dot - key;
967         store.multi_replace = multi_replace;
969         /*
970          * Validate the key and while at it, lower case it for matching.
971          */
972         store.key = xmalloc(strlen(key) + 1);
973         dot = 0;
974         for (i = 0; key[i]; i++) {
975                 unsigned char c = key[i];
976                 if (c == '.')
977                         dot = 1;
978                 /* Leave the extended basename untouched.. */
979                 if (!dot || i > store.baselen) {
980                         if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
981                                 error("invalid key: %s", key);
982                                 free(store.key);
983                                 ret = 1;
984                                 goto out_free;
985                         }
986                         c = tolower(c);
987                 } else if (c == '\n') {
988                         error("invalid key (newline): %s", key);
989                         free(store.key);
990                         ret = 1;
991                         goto out_free;
992                 }
993                 store.key[i] = c;
994         }
995         store.key[i] = 0;
997         /*
998          * The lock serves a purpose in addition to locking: the new
999          * contents of .git/config will be written into it.
1000          */
1001         lock = xcalloc(sizeof(struct lock_file), 1);
1002         fd = hold_lock_file_for_update(lock, config_filename, 0);
1003         if (fd < 0) {
1004                 error("could not lock config file %s: %s", config_filename, strerror(errno));
1005                 free(store.key);
1006                 ret = -1;
1007                 goto out_free;
1008         }
1010         /*
1011          * If .git/config does not exist yet, write a minimal version.
1012          */
1013         in_fd = open(config_filename, O_RDONLY);
1014         if ( in_fd < 0 ) {
1015                 free(store.key);
1017                 if ( ENOENT != errno ) {
1018                         error("opening %s: %s", config_filename,
1019                               strerror(errno));
1020                         ret = 3; /* same as "invalid config file" */
1021                         goto out_free;
1022                 }
1023                 /* if nothing to unset, error out */
1024                 if (value == NULL) {
1025                         ret = 5;
1026                         goto out_free;
1027                 }
1029                 store.key = (char *)key;
1030                 if (!store_write_section(fd, key) ||
1031                     !store_write_pair(fd, key, value))
1032                         goto write_err_out;
1033         } else {
1034                 struct stat st;
1035                 char *contents;
1036                 size_t contents_sz, copy_begin, copy_end;
1037                 int i, new_line = 0;
1039                 if (value_regex == NULL)
1040                         store.value_regex = NULL;
1041                 else {
1042                         if (value_regex[0] == '!') {
1043                                 store.do_not_match = 1;
1044                                 value_regex++;
1045                         } else
1046                                 store.do_not_match = 0;
1048                         store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1049                         if (regcomp(store.value_regex, value_regex,
1050                                         REG_EXTENDED)) {
1051                                 error("invalid pattern: %s", value_regex);
1052                                 free(store.value_regex);
1053                                 ret = 6;
1054                                 goto out_free;
1055                         }
1056                 }
1058                 store.offset[0] = 0;
1059                 store.state = START;
1060                 store.seen = 0;
1062                 /*
1063                  * After this, store.offset will contain the *end* offset
1064                  * of the last match, or remain at 0 if no match was found.
1065                  * As a side effect, we make sure to transform only a valid
1066                  * existing config file.
1067                  */
1068                 if (git_config_from_file(store_aux, config_filename, NULL)) {
1069                         error("invalid config file %s", config_filename);
1070                         free(store.key);
1071                         if (store.value_regex != NULL) {
1072                                 regfree(store.value_regex);
1073                                 free(store.value_regex);
1074                         }
1075                         ret = 3;
1076                         goto out_free;
1077                 }
1079                 free(store.key);
1080                 if (store.value_regex != NULL) {
1081                         regfree(store.value_regex);
1082                         free(store.value_regex);
1083                 }
1085                 /* if nothing to unset, or too many matches, error out */
1086                 if ((store.seen == 0 && value == NULL) ||
1087                                 (store.seen > 1 && multi_replace == 0)) {
1088                         ret = 5;
1089                         goto out_free;
1090                 }
1092                 fstat(in_fd, &st);
1093                 contents_sz = xsize_t(st.st_size);
1094                 contents = xmmap(NULL, contents_sz, PROT_READ,
1095                         MAP_PRIVATE, in_fd, 0);
1096                 close(in_fd);
1098                 if (store.seen == 0)
1099                         store.seen = 1;
1101                 for (i = 0, copy_begin = 0; i < store.seen; i++) {
1102                         if (store.offset[i] == 0) {
1103                                 store.offset[i] = copy_end = contents_sz;
1104                         } else if (store.state != KEY_SEEN) {
1105                                 copy_end = store.offset[i];
1106                         } else
1107                                 copy_end = find_beginning_of_line(
1108                                         contents, contents_sz,
1109                                         store.offset[i]-2, &new_line);
1111                         if (copy_end > 0 && contents[copy_end-1] != '\n')
1112                                 new_line = 1;
1114                         /* write the first part of the config */
1115                         if (copy_end > copy_begin) {
1116                                 if (write_in_full(fd, contents + copy_begin,
1117                                                   copy_end - copy_begin) <
1118                                     copy_end - copy_begin)
1119                                         goto write_err_out;
1120                                 if (new_line &&
1121                                     write_in_full(fd, "\n", 1) != 1)
1122                                         goto write_err_out;
1123                         }
1124                         copy_begin = store.offset[i];
1125                 }
1127                 /* write the pair (value == NULL means unset) */
1128                 if (value != NULL) {
1129                         if (store.state == START) {
1130                                 if (!store_write_section(fd, key))
1131                                         goto write_err_out;
1132                         }
1133                         if (!store_write_pair(fd, key, value))
1134                                 goto write_err_out;
1135                 }
1137                 /* write the rest of the config */
1138                 if (copy_begin < contents_sz)
1139                         if (write_in_full(fd, contents + copy_begin,
1140                                           contents_sz - copy_begin) <
1141                             contents_sz - copy_begin)
1142                                 goto write_err_out;
1144                 munmap(contents, contents_sz);
1145         }
1147         if (commit_lock_file(lock) < 0) {
1148                 error("could not commit config file %s", config_filename);
1149                 ret = 4;
1150                 goto out_free;
1151         }
1153         /*
1154          * lock is committed, so don't try to roll it back below.
1155          * NOTE: Since lockfile.c keeps a linked list of all created
1156          * lock_file structures, it isn't safe to free(lock).  It's
1157          * better to just leave it hanging around.
1158          */
1159         lock = NULL;
1160         ret = 0;
1162 out_free:
1163         if (lock)
1164                 rollback_lock_file(lock);
1165         free(config_filename);
1166         return ret;
1168 write_err_out:
1169         ret = write_error(lock->filename);
1170         goto out_free;
1174 static int section_name_match (const char *buf, const char *name)
1176         int i = 0, j = 0, dot = 0;
1177         for (; buf[i] && buf[i] != ']'; i++) {
1178                 if (!dot && isspace(buf[i])) {
1179                         dot = 1;
1180                         if (name[j++] != '.')
1181                                 break;
1182                         for (i++; isspace(buf[i]); i++)
1183                                 ; /* do nothing */
1184                         if (buf[i] != '"')
1185                                 break;
1186                         continue;
1187                 }
1188                 if (buf[i] == '\\' && dot)
1189                         i++;
1190                 else if (buf[i] == '"' && dot) {
1191                         for (i++; isspace(buf[i]); i++)
1192                                 ; /* do_nothing */
1193                         break;
1194                 }
1195                 if (buf[i] != name[j++])
1196                         break;
1197         }
1198         return (buf[i] == ']' && name[j] == 0);
1201 /* if new_name == NULL, the section is removed instead */
1202 int git_config_rename_section(const char *old_name, const char *new_name)
1204         int ret = 0, remove = 0;
1205         char *config_filename;
1206         struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1207         int out_fd;
1208         char buf[1024];
1210         if (config_exclusive_filename)
1211                 config_filename = xstrdup(config_exclusive_filename);
1212         else
1213                 config_filename = git_pathdup("config");
1214         out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1215         if (out_fd < 0) {
1216                 ret = error("could not lock config file %s", config_filename);
1217                 goto out;
1218         }
1220         if (!(config_file = fopen(config_filename, "rb"))) {
1221                 /* no config file means nothing to rename, no error */
1222                 goto unlock_and_out;
1223         }
1225         while (fgets(buf, sizeof(buf), config_file)) {
1226                 int i;
1227                 int length;
1228                 for (i = 0; buf[i] && isspace(buf[i]); i++)
1229                         ; /* do nothing */
1230                 if (buf[i] == '[') {
1231                         /* it's a section */
1232                         if (section_name_match (&buf[i+1], old_name)) {
1233                                 ret++;
1234                                 if (new_name == NULL) {
1235                                         remove = 1;
1236                                         continue;
1237                                 }
1238                                 store.baselen = strlen(new_name);
1239                                 if (!store_write_section(out_fd, new_name)) {
1240                                         ret = write_error(lock->filename);
1241                                         goto out;
1242                                 }
1243                                 continue;
1244                         }
1245                         remove = 0;
1246                 }
1247                 if (remove)
1248                         continue;
1249                 length = strlen(buf);
1250                 if (write_in_full(out_fd, buf, length) != length) {
1251                         ret = write_error(lock->filename);
1252                         goto out;
1253                 }
1254         }
1255         fclose(config_file);
1256  unlock_and_out:
1257         if (commit_lock_file(lock) < 0)
1258                 ret = error("could not commit config file %s", config_filename);
1259  out:
1260         free(config_filename);
1261         return ret;
1264 /*
1265  * Call this to report error for your variable that should not
1266  * get a boolean value (i.e. "[my] var" means "true").
1267  */
1268 int config_error_nonbool(const char *var)
1270         return error("Missing value for '%s'", var);