Code

am: Fix launching of pager
[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                         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                 user_ident_explicitly_given |= IDENT_NAME_GIVEN;
537                 return 0;
538         }
540         if (!strcmp(var, "user.email")) {
541                 if (!value)
542                         return config_error_nonbool(var);
543                 strlcpy(git_default_email, value, sizeof(git_default_email));
544                 user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
545                 return 0;
546         }
548         /* Add other config variables here and to Documentation/config.txt. */
549         return 0;
552 static int git_default_i18n_config(const char *var, const char *value)
554         if (!strcmp(var, "i18n.commitencoding"))
555                 return git_config_string(&git_commit_encoding, var, value);
557         if (!strcmp(var, "i18n.logoutputencoding"))
558                 return git_config_string(&git_log_output_encoding, var, value);
560         /* Add other config variables here and to Documentation/config.txt. */
561         return 0;
564 static int git_default_branch_config(const char *var, const char *value)
566         if (!strcmp(var, "branch.autosetupmerge")) {
567                 if (value && !strcasecmp(value, "always")) {
568                         git_branch_track = BRANCH_TRACK_ALWAYS;
569                         return 0;
570                 }
571                 git_branch_track = git_config_bool(var, value);
572                 return 0;
573         }
574         if (!strcmp(var, "branch.autosetuprebase")) {
575                 if (!value)
576                         return config_error_nonbool(var);
577                 else if (!strcmp(value, "never"))
578                         autorebase = AUTOREBASE_NEVER;
579                 else if (!strcmp(value, "local"))
580                         autorebase = AUTOREBASE_LOCAL;
581                 else if (!strcmp(value, "remote"))
582                         autorebase = AUTOREBASE_REMOTE;
583                 else if (!strcmp(value, "always"))
584                         autorebase = AUTOREBASE_ALWAYS;
585                 else
586                         return error("Malformed value for %s", var);
587                 return 0;
588         }
590         /* Add other config variables here and to Documentation/config.txt. */
591         return 0;
594 static int git_default_push_config(const char *var, const char *value)
596         if (!strcmp(var, "push.default")) {
597                 if (!value)
598                         return config_error_nonbool(var);
599                 else if (!strcmp(value, "nothing"))
600                         push_default = PUSH_DEFAULT_NOTHING;
601                 else if (!strcmp(value, "matching"))
602                         push_default = PUSH_DEFAULT_MATCHING;
603                 else if (!strcmp(value, "tracking"))
604                         push_default = PUSH_DEFAULT_TRACKING;
605                 else if (!strcmp(value, "current"))
606                         push_default = PUSH_DEFAULT_CURRENT;
607                 else {
608                         error("Malformed value for %s: %s", var, value);
609                         return error("Must be one of nothing, matching, "
610                                      "tracking or current.");
611                 }
612                 return 0;
613         }
615         /* Add other config variables here and to Documentation/config.txt. */
616         return 0;
619 static int git_default_mailmap_config(const char *var, const char *value)
621         if (!strcmp(var, "mailmap.file"))
622                 return git_config_string(&git_mailmap_file, var, value);
624         /* Add other config variables here and to Documentation/config.txt. */
625         return 0;
628 int git_default_config(const char *var, const char *value, void *dummy)
630         if (!prefixcmp(var, "core."))
631                 return git_default_core_config(var, value);
633         if (!prefixcmp(var, "user."))
634                 return git_default_user_config(var, value);
636         if (!prefixcmp(var, "i18n."))
637                 return git_default_i18n_config(var, value);
639         if (!prefixcmp(var, "branch."))
640                 return git_default_branch_config(var, value);
642         if (!prefixcmp(var, "push."))
643                 return git_default_push_config(var, value);
645         if (!prefixcmp(var, "mailmap."))
646                 return git_default_mailmap_config(var, value);
648         if (!prefixcmp(var, "advice."))
649                 return git_default_advice_config(var, value);
651         if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
652                 pager_use_color = git_config_bool(var,value);
653                 return 0;
654         }
656         /* Add other config variables here and to Documentation/config.txt. */
657         return 0;
660 int git_config_from_file(config_fn_t fn, const char *filename, void *data)
662         int ret;
663         FILE *f = fopen(filename, "r");
665         ret = -1;
666         if (f) {
667                 config_file = f;
668                 config_file_name = filename;
669                 config_linenr = 1;
670                 config_file_eof = 0;
671                 ret = git_parse_file(fn, data);
672                 fclose(f);
673                 config_file_name = NULL;
674         }
675         return ret;
678 const char *git_etc_gitconfig(void)
680         static const char *system_wide;
681         if (!system_wide)
682                 system_wide = system_path(ETC_GITCONFIG);
683         return system_wide;
686 static int git_env_bool(const char *k, int def)
688         const char *v = getenv(k);
689         return v ? git_config_bool(k, v) : def;
692 int git_config_system(void)
694         return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
697 int git_config_global(void)
699         return !git_env_bool("GIT_CONFIG_NOGLOBAL", 0);
702 int git_config(config_fn_t fn, void *data)
704         int ret = 0, found = 0;
705         char *repo_config = NULL;
706         const char *home = NULL;
708         /* Setting $GIT_CONFIG makes git read _only_ the given config file. */
709         if (config_exclusive_filename)
710                 return git_config_from_file(fn, config_exclusive_filename, data);
711         if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
712                 ret += git_config_from_file(fn, git_etc_gitconfig(),
713                                             data);
714                 found += 1;
715         }
717         home = getenv("HOME");
718         if (git_config_global() && home) {
719                 char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
720                 if (!access(user_config, R_OK)) {
721                         ret += git_config_from_file(fn, user_config, data);
722                         found += 1;
723                 }
724                 free(user_config);
725         }
727         repo_config = git_pathdup("config");
728         if (!access(repo_config, R_OK)) {
729                 ret += git_config_from_file(fn, repo_config, data);
730                 found += 1;
731         }
732         free(repo_config);
733         if (found == 0)
734                 return -1;
735         return ret;
738 /*
739  * Find all the stuff for git_config_set() below.
740  */
742 #define MAX_MATCHES 512
744 static struct {
745         int baselen;
746         char *key;
747         int do_not_match;
748         regex_t *value_regex;
749         int multi_replace;
750         size_t offset[MAX_MATCHES];
751         enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
752         int seen;
753 } store;
755 static int matches(const char *key, const char *value)
757         return !strcmp(key, store.key) &&
758                 (store.value_regex == NULL ||
759                  (store.do_not_match ^
760                   !regexec(store.value_regex, value, 0, NULL, 0)));
763 static int store_aux(const char *key, const char *value, void *cb)
765         const char *ep;
766         size_t section_len;
768         switch (store.state) {
769         case KEY_SEEN:
770                 if (matches(key, value)) {
771                         if (store.seen == 1 && store.multi_replace == 0) {
772                                 warning("%s has multiple values", key);
773                         } else if (store.seen >= MAX_MATCHES) {
774                                 error("too many matches for %s", key);
775                                 return 1;
776                         }
778                         store.offset[store.seen] = ftell(config_file);
779                         store.seen++;
780                 }
781                 break;
782         case SECTION_SEEN:
783                 /*
784                  * What we are looking for is in store.key (both
785                  * section and var), and its section part is baselen
786                  * long.  We found key (again, both section and var).
787                  * We would want to know if this key is in the same
788                  * section as what we are looking for.  We already
789                  * know we are in the same section as what should
790                  * hold store.key.
791                  */
792                 ep = strrchr(key, '.');
793                 section_len = ep - key;
795                 if ((section_len != store.baselen) ||
796                     memcmp(key, store.key, section_len+1)) {
797                         store.state = SECTION_END_SEEN;
798                         break;
799                 }
801                 /*
802                  * Do not increment matches: this is no match, but we
803                  * just made sure we are in the desired section.
804                  */
805                 store.offset[store.seen] = ftell(config_file);
806                 /* fallthru */
807         case SECTION_END_SEEN:
808         case START:
809                 if (matches(key, value)) {
810                         store.offset[store.seen] = ftell(config_file);
811                         store.state = KEY_SEEN;
812                         store.seen++;
813                 } else {
814                         if (strrchr(key, '.') - key == store.baselen &&
815                               !strncmp(key, store.key, store.baselen)) {
816                                         store.state = SECTION_SEEN;
817                                         store.offset[store.seen] = ftell(config_file);
818                         }
819                 }
820         }
821         return 0;
824 static int write_error(const char *filename)
826         error("failed to write new configuration file %s", filename);
828         /* Same error code as "failed to rename". */
829         return 4;
832 static int store_write_section(int fd, const char *key)
834         const char *dot;
835         int i, success;
836         struct strbuf sb = STRBUF_INIT;
838         dot = memchr(key, '.', store.baselen);
839         if (dot) {
840                 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
841                 for (i = dot - key + 1; i < store.baselen; i++) {
842                         if (key[i] == '"' || key[i] == '\\')
843                                 strbuf_addch(&sb, '\\');
844                         strbuf_addch(&sb, key[i]);
845                 }
846                 strbuf_addstr(&sb, "\"]\n");
847         } else {
848                 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
849         }
851         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
852         strbuf_release(&sb);
854         return success;
857 static int store_write_pair(int fd, const char *key, const char *value)
859         int i, success;
860         int length = strlen(key + store.baselen + 1);
861         const char *quote = "";
862         struct strbuf sb = STRBUF_INIT;
864         /*
865          * Check to see if the value needs to be surrounded with a dq pair.
866          * Note that problematic characters are always backslash-quoted; this
867          * check is about not losing leading or trailing SP and strings that
868          * follow beginning-of-comment characters (i.e. ';' and '#') by the
869          * configuration parser.
870          */
871         if (value[0] == ' ')
872                 quote = "\"";
873         for (i = 0; value[i]; i++)
874                 if (value[i] == ';' || value[i] == '#')
875                         quote = "\"";
876         if (i && value[i - 1] == ' ')
877                 quote = "\"";
879         strbuf_addf(&sb, "\t%.*s = %s",
880                     length, key + store.baselen + 1, quote);
882         for (i = 0; value[i]; i++)
883                 switch (value[i]) {
884                 case '\n':
885                         strbuf_addstr(&sb, "\\n");
886                         break;
887                 case '\t':
888                         strbuf_addstr(&sb, "\\t");
889                         break;
890                 case '"':
891                 case '\\':
892                         strbuf_addch(&sb, '\\');
893                 default:
894                         strbuf_addch(&sb, value[i]);
895                         break;
896                 }
897         strbuf_addf(&sb, "%s\n", quote);
899         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
900         strbuf_release(&sb);
902         return success;
905 static ssize_t find_beginning_of_line(const char *contents, size_t size,
906         size_t offset_, int *found_bracket)
908         size_t equal_offset = size, bracket_offset = size;
909         ssize_t offset;
911 contline:
912         for (offset = offset_-2; offset > 0
913                         && contents[offset] != '\n'; offset--)
914                 switch (contents[offset]) {
915                         case '=': equal_offset = offset; break;
916                         case ']': bracket_offset = offset; break;
917                 }
918         if (offset > 0 && contents[offset-1] == '\\') {
919                 offset_ = offset;
920                 goto contline;
921         }
922         if (bracket_offset < equal_offset) {
923                 *found_bracket = 1;
924                 offset = bracket_offset+1;
925         } else
926                 offset++;
928         return offset;
931 int git_config_set(const char *key, const char *value)
933         return git_config_set_multivar(key, value, NULL, 0);
936 /*
937  * If value==NULL, unset in (remove from) config,
938  * if value_regex!=NULL, disregard key/value pairs where value does not match.
939  * if multi_replace==0, nothing, or only one matching key/value is replaced,
940  *     else all matching key/values (regardless how many) are removed,
941  *     before the new pair is written.
942  *
943  * Returns 0 on success.
944  *
945  * This function does this:
946  *
947  * - it locks the config file by creating ".git/config.lock"
948  *
949  * - it then parses the config using store_aux() as validator to find
950  *   the position on the key/value pair to replace. If it is to be unset,
951  *   it must be found exactly once.
952  *
953  * - the config file is mmap()ed and the part before the match (if any) is
954  *   written to the lock file, then the changed part and the rest.
955  *
956  * - the config file is removed and the lock file rename()d to it.
957  *
958  */
959 int git_config_set_multivar(const char *key, const char *value,
960         const char *value_regex, int multi_replace)
962         int i, dot;
963         int fd = -1, in_fd;
964         int ret;
965         char *config_filename;
966         struct lock_file *lock = NULL;
967         const char *last_dot = strrchr(key, '.');
969         if (config_exclusive_filename)
970                 config_filename = xstrdup(config_exclusive_filename);
971         else
972                 config_filename = git_pathdup("config");
974         /*
975          * Since "key" actually contains the section name and the real
976          * key name separated by a dot, we have to know where the dot is.
977          */
979         if (last_dot == NULL) {
980                 error("key does not contain a section: %s", key);
981                 ret = 2;
982                 goto out_free;
983         }
984         store.baselen = last_dot - key;
986         store.multi_replace = multi_replace;
988         /*
989          * Validate the key and while at it, lower case it for matching.
990          */
991         store.key = xmalloc(strlen(key) + 1);
992         dot = 0;
993         for (i = 0; key[i]; i++) {
994                 unsigned char c = key[i];
995                 if (c == '.')
996                         dot = 1;
997                 /* Leave the extended basename untouched.. */
998                 if (!dot || i > store.baselen) {
999                         if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
1000                                 error("invalid key: %s", key);
1001                                 free(store.key);
1002                                 ret = 1;
1003                                 goto out_free;
1004                         }
1005                         c = tolower(c);
1006                 } else if (c == '\n') {
1007                         error("invalid key (newline): %s", key);
1008                         free(store.key);
1009                         ret = 1;
1010                         goto out_free;
1011                 }
1012                 store.key[i] = c;
1013         }
1014         store.key[i] = 0;
1016         /*
1017          * The lock serves a purpose in addition to locking: the new
1018          * contents of .git/config will be written into it.
1019          */
1020         lock = xcalloc(sizeof(struct lock_file), 1);
1021         fd = hold_lock_file_for_update(lock, config_filename, 0);
1022         if (fd < 0) {
1023                 error("could not lock config file %s: %s", config_filename, strerror(errno));
1024                 free(store.key);
1025                 ret = -1;
1026                 goto out_free;
1027         }
1029         /*
1030          * If .git/config does not exist yet, write a minimal version.
1031          */
1032         in_fd = open(config_filename, O_RDONLY);
1033         if ( in_fd < 0 ) {
1034                 free(store.key);
1036                 if ( ENOENT != errno ) {
1037                         error("opening %s: %s", config_filename,
1038                               strerror(errno));
1039                         ret = 3; /* same as "invalid config file" */
1040                         goto out_free;
1041                 }
1042                 /* if nothing to unset, error out */
1043                 if (value == NULL) {
1044                         ret = 5;
1045                         goto out_free;
1046                 }
1048                 store.key = (char *)key;
1049                 if (!store_write_section(fd, key) ||
1050                     !store_write_pair(fd, key, value))
1051                         goto write_err_out;
1052         } else {
1053                 struct stat st;
1054                 char *contents;
1055                 size_t contents_sz, copy_begin, copy_end;
1056                 int i, new_line = 0;
1058                 if (value_regex == NULL)
1059                         store.value_regex = NULL;
1060                 else {
1061                         if (value_regex[0] == '!') {
1062                                 store.do_not_match = 1;
1063                                 value_regex++;
1064                         } else
1065                                 store.do_not_match = 0;
1067                         store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1068                         if (regcomp(store.value_regex, value_regex,
1069                                         REG_EXTENDED)) {
1070                                 error("invalid pattern: %s", value_regex);
1071                                 free(store.value_regex);
1072                                 ret = 6;
1073                                 goto out_free;
1074                         }
1075                 }
1077                 store.offset[0] = 0;
1078                 store.state = START;
1079                 store.seen = 0;
1081                 /*
1082                  * After this, store.offset will contain the *end* offset
1083                  * of the last match, or remain at 0 if no match was found.
1084                  * As a side effect, we make sure to transform only a valid
1085                  * existing config file.
1086                  */
1087                 if (git_config_from_file(store_aux, config_filename, NULL)) {
1088                         error("invalid config file %s", config_filename);
1089                         free(store.key);
1090                         if (store.value_regex != NULL) {
1091                                 regfree(store.value_regex);
1092                                 free(store.value_regex);
1093                         }
1094                         ret = 3;
1095                         goto out_free;
1096                 }
1098                 free(store.key);
1099                 if (store.value_regex != NULL) {
1100                         regfree(store.value_regex);
1101                         free(store.value_regex);
1102                 }
1104                 /* if nothing to unset, or too many matches, error out */
1105                 if ((store.seen == 0 && value == NULL) ||
1106                                 (store.seen > 1 && multi_replace == 0)) {
1107                         ret = 5;
1108                         goto out_free;
1109                 }
1111                 fstat(in_fd, &st);
1112                 contents_sz = xsize_t(st.st_size);
1113                 contents = xmmap(NULL, contents_sz, PROT_READ,
1114                         MAP_PRIVATE, in_fd, 0);
1115                 close(in_fd);
1117                 if (store.seen == 0)
1118                         store.seen = 1;
1120                 for (i = 0, copy_begin = 0; i < store.seen; i++) {
1121                         if (store.offset[i] == 0) {
1122                                 store.offset[i] = copy_end = contents_sz;
1123                         } else if (store.state != KEY_SEEN) {
1124                                 copy_end = store.offset[i];
1125                         } else
1126                                 copy_end = find_beginning_of_line(
1127                                         contents, contents_sz,
1128                                         store.offset[i]-2, &new_line);
1130                         if (copy_end > 0 && contents[copy_end-1] != '\n')
1131                                 new_line = 1;
1133                         /* write the first part of the config */
1134                         if (copy_end > copy_begin) {
1135                                 if (write_in_full(fd, contents + copy_begin,
1136                                                   copy_end - copy_begin) <
1137                                     copy_end - copy_begin)
1138                                         goto write_err_out;
1139                                 if (new_line &&
1140                                     write_str_in_full(fd, "\n") != 1)
1141                                         goto write_err_out;
1142                         }
1143                         copy_begin = store.offset[i];
1144                 }
1146                 /* write the pair (value == NULL means unset) */
1147                 if (value != NULL) {
1148                         if (store.state == START) {
1149                                 if (!store_write_section(fd, key))
1150                                         goto write_err_out;
1151                         }
1152                         if (!store_write_pair(fd, key, value))
1153                                 goto write_err_out;
1154                 }
1156                 /* write the rest of the config */
1157                 if (copy_begin < contents_sz)
1158                         if (write_in_full(fd, contents + copy_begin,
1159                                           contents_sz - copy_begin) <
1160                             contents_sz - copy_begin)
1161                                 goto write_err_out;
1163                 munmap(contents, contents_sz);
1164         }
1166         if (commit_lock_file(lock) < 0) {
1167                 error("could not commit config file %s", config_filename);
1168                 ret = 4;
1169                 goto out_free;
1170         }
1172         /*
1173          * lock is committed, so don't try to roll it back below.
1174          * NOTE: Since lockfile.c keeps a linked list of all created
1175          * lock_file structures, it isn't safe to free(lock).  It's
1176          * better to just leave it hanging around.
1177          */
1178         lock = NULL;
1179         ret = 0;
1181 out_free:
1182         if (lock)
1183                 rollback_lock_file(lock);
1184         free(config_filename);
1185         return ret;
1187 write_err_out:
1188         ret = write_error(lock->filename);
1189         goto out_free;
1193 static int section_name_match (const char *buf, const char *name)
1195         int i = 0, j = 0, dot = 0;
1196         if (buf[i] != '[')
1197                 return 0;
1198         for (i = 1; buf[i] && buf[i] != ']'; i++) {
1199                 if (!dot && isspace(buf[i])) {
1200                         dot = 1;
1201                         if (name[j++] != '.')
1202                                 break;
1203                         for (i++; isspace(buf[i]); i++)
1204                                 ; /* do nothing */
1205                         if (buf[i] != '"')
1206                                 break;
1207                         continue;
1208                 }
1209                 if (buf[i] == '\\' && dot)
1210                         i++;
1211                 else if (buf[i] == '"' && dot) {
1212                         for (i++; isspace(buf[i]); i++)
1213                                 ; /* do_nothing */
1214                         break;
1215                 }
1216                 if (buf[i] != name[j++])
1217                         break;
1218         }
1219         if (buf[i] == ']' && name[j] == 0) {
1220                 /*
1221                  * We match, now just find the right length offset by
1222                  * gobbling up any whitespace after it, as well
1223                  */
1224                 i++;
1225                 for (; buf[i] && isspace(buf[i]); i++)
1226                         ; /* do nothing */
1227                 return i;
1228         }
1229         return 0;
1232 /* if new_name == NULL, the section is removed instead */
1233 int git_config_rename_section(const char *old_name, const char *new_name)
1235         int ret = 0, remove = 0;
1236         char *config_filename;
1237         struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1238         int out_fd;
1239         char buf[1024];
1241         if (config_exclusive_filename)
1242                 config_filename = xstrdup(config_exclusive_filename);
1243         else
1244                 config_filename = git_pathdup("config");
1245         out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1246         if (out_fd < 0) {
1247                 ret = error("could not lock config file %s", config_filename);
1248                 goto out;
1249         }
1251         if (!(config_file = fopen(config_filename, "rb"))) {
1252                 /* no config file means nothing to rename, no error */
1253                 goto unlock_and_out;
1254         }
1256         while (fgets(buf, sizeof(buf), config_file)) {
1257                 int i;
1258                 int length;
1259                 char *output = buf;
1260                 for (i = 0; buf[i] && isspace(buf[i]); i++)
1261                         ; /* do nothing */
1262                 if (buf[i] == '[') {
1263                         /* it's a section */
1264                         int offset = section_name_match(&buf[i], old_name);
1265                         if (offset > 0) {
1266                                 ret++;
1267                                 if (new_name == NULL) {
1268                                         remove = 1;
1269                                         continue;
1270                                 }
1271                                 store.baselen = strlen(new_name);
1272                                 if (!store_write_section(out_fd, new_name)) {
1273                                         ret = write_error(lock->filename);
1274                                         goto out;
1275                                 }
1276                                 /*
1277                                  * We wrote out the new section, with
1278                                  * a newline, now skip the old
1279                                  * section's length
1280                                  */
1281                                 output += offset + i;
1282                                 if (strlen(output) > 0) {
1283                                         /*
1284                                          * More content means there's
1285                                          * a declaration to put on the
1286                                          * next line; indent with a
1287                                          * tab
1288                                          */
1289                                         output -= 1;
1290                                         output[0] = '\t';
1291                                 }
1292                         }
1293                         remove = 0;
1294                 }
1295                 if (remove)
1296                         continue;
1297                 length = strlen(output);
1298                 if (write_in_full(out_fd, output, length) != length) {
1299                         ret = write_error(lock->filename);
1300                         goto out;
1301                 }
1302         }
1303         fclose(config_file);
1304  unlock_and_out:
1305         if (commit_lock_file(lock) < 0)
1306                 ret = error("could not commit config file %s", config_filename);
1307  out:
1308         free(config_filename);
1309         return ret;
1312 /*
1313  * Call this to report error for your variable that should not
1314  * get a boolean value (i.e. "[my] var" means "true").
1315  */
1316 int config_error_nonbool(const char *var)
1318         return error("Missing value for '%s'", var);