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"
  10 #include "strbuf.h"
  11 #include "quote.h"
  12
  13 typedef struct config_file {
  14         struct config_file *prev;
  15         FILE *f;
  16         const char *name;
  17         int linenr;
  18         int eof;
  19         struct strbuf value;
  20         struct strbuf var;
  21 } config_file;
  22
  23 static config_file *cf;
  24
  25 static int zlib_compression_seen;
  26
  27 #define MAX_INCLUDE_DEPTH 10
  28 static const char include_depth_advice[] =
  29 "exceeded maximum include depth (%d) while including\n"
  30 "       %s\n"
  31 "from\n"
  32 "       %s\n"
  33 "Do you have circular includes?";
  34 static int handle_path_include(const char *path, struct config_include_data *inc)
  35 {
  36         int ret = 0;
  37         struct strbuf buf = STRBUF_INIT;
  38         char *expanded = expand_user_path(path);
  39
  40         if (!expanded)
  41                 return error("Could not expand include path '%s'", path);
  42         path = expanded;
  43
  44         /*
  45          * Use an absolute path as-is, but interpret relative paths
  46          * based on the including config file.
  47          */
  48         if (!is_absolute_path(path)) {
  49                 char *slash;
  50
  51                 if (!cf || !cf->name)
  52                         return error("relative config includes must come from files");
  53
  54                 slash = find_last_dir_sep(cf->name);
  55                 if (slash)
  56                         strbuf_add(&buf, cf->name, slash - cf->name + 1);
  57                 strbuf_addstr(&buf, path);
  58                 path = buf.buf;
  59         }
  60
  61         if (!access_or_die(path, R_OK)) {
  62                 if (++inc->depth > MAX_INCLUDE_DEPTH)
  63                         die(include_depth_advice, MAX_INCLUDE_DEPTH, path,
  64                             cf && cf->name ? cf->name : "the command line");
  65                 ret = git_config_from_file(git_config_include, path, inc);
  66                 inc->depth--;
  67         }
  68         strbuf_release(&buf);
  69         free(expanded);
  70         return ret;
  71 }
  72
  73 int git_config_include(const char *var, const char *value, void *data)
  74 {
  75         struct config_include_data *inc = data;
  76         const char *type;
  77         int ret;
  78
  79         /*
  80          * Pass along all values, including "include" directives; this makes it
  81          * possible to query information on the includes themselves.
  82          */
  83         ret = inc->fn(var, value, inc->data);
  84         if (ret < 0)
  85                 return ret;
  86
  87         type = skip_prefix(var, "include.");
  88         if (!type)
  89                 return ret;
  90
  91         if (!strcmp(type, "path"))
  92                 ret = handle_path_include(value, inc);
  93         return ret;
  94 }
  95
  96 static void lowercase(char *p)
  97 {
  98         for (; *p; p++)
  99                 *p = tolower(*p);
 100 }
 101
 102 void git_config_push_parameter(const char *text)
 103 {
 104         struct strbuf env = STRBUF_INIT;
 105         const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
 106         if (old) {
 107                 strbuf_addstr(&env, old);
 108                 strbuf_addch(&env, ' ');
 109         }
 110         sq_quote_buf(&env, text);
 111         setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
 112         strbuf_release(&env);
 113 }
 114
 115 int git_config_parse_parameter(const char *text,
 116                                config_fn_t fn, void *data)
 117 {
 118         struct strbuf **pair;
 119         pair = strbuf_split_str(text, '=', 2);
 120         if (!pair[0])
 121                 return error("bogus config parameter: %s", text);
 122         if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=')
 123                 strbuf_setlen(pair[0], pair[0]->len - 1);
 124         strbuf_trim(pair[0]);
 125         if (!pair[0]->len) {
 126                 strbuf_list_free(pair);
 127                 return error("bogus config parameter: %s", text);
 128         }
 129         lowercase(pair[0]->buf);
 130         if (fn(pair[0]->buf, pair[1] ? pair[1]->buf : NULL, data) < 0) {
 131                 strbuf_list_free(pair);
 132                 return -1;
 133         }
 134         strbuf_list_free(pair);
 135         return 0;
 136 }
 137
 138 int git_config_from_parameters(config_fn_t fn, void *data)
 139 {
 140         const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
 141         char *envw;
 142         const char **argv = NULL;
 143         int nr = 0, alloc = 0;
 144         int i;
 145
 146         if (!env)
 147                 return 0;
 148         /* sq_dequote will write over it */
 149         envw = xstrdup(env);
 150
 151         if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
 152                 free(envw);
 153                 return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
 154         }
 155
 156         for (i = 0; i < nr; i++) {
 157                 if (git_config_parse_parameter(argv[i], fn, data) < 0) {
 158                         free(argv);
 159                         free(envw);
 160                         return -1;
 161                 }
 162         }
 163
 164         free(argv);
 165         free(envw);
 166         return nr > 0;
 167 }
 168
 169 static int get_next_char(void)
 170 {
 171         int c;
 172         FILE *f;
 173
 174         c = '\n';
 175         if (cf && ((f = cf->f) != NULL)) {
 176                 c = fgetc(f);
 177                 if (c == '\r') {
 178                         /* DOS like systems */
 179                         c = fgetc(f);
 180                         if (c != '\n') {
 181                                 ungetc(c, f);
 182                                 c = '\r';
 183                         }
 184                 }
 185                 if (c == '\n')
 186                         cf->linenr++;
 187                 if (c == EOF) {
 188                         cf->eof = 1;
 189                         c = '\n';
 190                 }
 191         }
 192         return c;
 193 }
 194
 195 static char *parse_value(void)
 196 {
 197         int quote = 0, comment = 0, space = 0;
 198
 199         strbuf_reset(&cf->value);
 200         for (;;) {
 201                 int c = get_next_char();
 202                 if (c == '\n') {
 203                         if (quote) {
 204                                 cf->linenr--;
 205                                 return NULL;
 206                         }
 207                         return cf->value.buf;
 208                 }
 209                 if (comment)
 210                         continue;
 211                 if (isspace(c) && !quote) {
 212                         if (cf->value.len)
 213                                 space++;
 214                         continue;
 215                 }
 216                 if (!quote) {
 217                         if (c == ';' || c == '#') {
 218                                 comment = 1;
 219                                 continue;
 220                         }
 221                 }
 222                 for (; space; space--)
 223                         strbuf_addch(&cf->value, ' ');
 224                 if (c == '\\') {
 225                         c = get_next_char();
 226                         switch (c) {
 227                         case '\n':
 228                                 continue;
 229                         case 't':
 230                                 c = '\t';
 231                                 break;
 232                         case 'b':
 233                                 c = '\b';
 234                                 break;
 235                         case 'n':
 236                                 c = '\n';
 237                                 break;
 238                         /* Some characters escape as themselves */
 239                         case '\\': case '"':
 240                                 break;
 241                         /* Reject unknown escape sequences */
 242                         default:
 243                                 return NULL;
 244                         }
 245                         strbuf_addch(&cf->value, c);
 246                         continue;
 247                 }
 248                 if (c == '"') {
 249                         quote = 1-quote;
 250                         continue;
 251                 }
 252                 strbuf_addch(&cf->value, c);
 253         }
 254 }
 255
 256 static inline int iskeychar(int c)
 257 {
 258         return isalnum(c) || c == '-';
 259 }
 260
 261 static int get_value(config_fn_t fn, void *data, struct strbuf *name)
 262 {
 263         int c;
 264         char *value;
 265
 266         /* Get the full name */
 267         for (;;) {
 268                 c = get_next_char();
 269                 if (cf->eof)
 270                         break;
 271                 if (!iskeychar(c))
 272                         break;
 273                 strbuf_addch(name, tolower(c));
 274         }
 275
 276         while (c == ' ' || c == '\t')
 277                 c = get_next_char();
 278
 279         value = NULL;
 280         if (c != '\n') {
 281                 if (c != '=')
 282                         return -1;
 283                 value = parse_value();
 284                 if (!value)
 285                         return -1;
 286         }
 287         return fn(name->buf, value, data);
 288 }
 289
 290 static int get_extended_base_var(struct strbuf *name, int c)
 291 {
 292         do {
 293                 if (c == '\n')
 294                         goto error_incomplete_line;
 295                 c = get_next_char();
 296         } while (isspace(c));
 297
 298         /* We require the format to be '[base "extension"]' */
 299         if (c != '"')
 300                 return -1;
 301         strbuf_addch(name, '.');
 302
 303         for (;;) {
 304                 int c = get_next_char();
 305                 if (c == '\n')
 306                         goto error_incomplete_line;
 307                 if (c == '"')
 308                         break;
 309                 if (c == '\\') {
 310                         c = get_next_char();
 311                         if (c == '\n')
 312                                 goto error_incomplete_line;
 313                 }
 314                 strbuf_addch(name, c);
 315         }
 316
 317         /* Final ']' */
 318         if (get_next_char() != ']')
 319                 return -1;
 320         return 0;
 321 error_incomplete_line:
 322         cf->linenr--;
 323         return -1;
 324 }
 325
 326 static int get_base_var(struct strbuf *name)
 327 {
 328         for (;;) {
 329                 int c = get_next_char();
 330                 if (cf->eof)
 331                         return -1;
 332                 if (c == ']')
 333                         return 0;
 334                 if (isspace(c))
 335                         return get_extended_base_var(name, c);
 336                 if (!iskeychar(c) && c != '.')
 337                         return -1;
 338                 strbuf_addch(name, tolower(c));
 339         }
 340 }
 341
 342 static int git_parse_file(config_fn_t fn, void *data)
 343 {
 344         int comment = 0;
 345         int baselen = 0;
 346         struct strbuf *var = &cf->var;
 347
 348         /* U+FEFF Byte Order Mark in UTF8 */
 349         static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
 350         const unsigned char *bomptr = utf8_bom;
 351
 352         for (;;) {
 353                 int c = get_next_char();
 354                 if (bomptr && *bomptr) {
 355                         /* We are at the file beginning; skip UTF8-encoded BOM
 356                          * if present. Sane editors won't put this in on their
 357                          * own, but e.g. Windows Notepad will do it happily. */
 358                         if ((unsigned char) c == *bomptr) {
 359                                 bomptr++;
 360                                 continue;
 361                         } else {
 362                                 /* Do not tolerate partial BOM. */
 363                                 if (bomptr != utf8_bom)
 364                                         break;
 365                                 /* No BOM at file beginning. Cool. */
 366                                 bomptr = NULL;
 367                         }
 368                 }
 369                 if (c == '\n') {
 370                         if (cf->eof)
 371                                 return 0;
 372                         comment = 0;
 373                         continue;
 374                 }
 375                 if (comment || isspace(c))
 376                         continue;
 377                 if (c == '#' || c == ';') {
 378                         comment = 1;
 379                         continue;
 380                 }
 381                 if (c == '[') {
 382                         /* Reset prior to determining a new stem */
 383                         strbuf_reset(var);
 384                         if (get_base_var(var) < 0 || var->len < 1)
 385                                 break;
 386                         strbuf_addch(var, '.');
 387                         baselen = var->len;
 388                         continue;
 389                 }
 390                 if (!isalpha(c))
 391                         break;
 392                 /*
 393                  * Truncate the var name back to the section header
 394                  * stem prior to grabbing the suffix part of the name
 395                  * and the value.
 396                  */
 397                 strbuf_setlen(var, baselen);
 398                 strbuf_addch(var, tolower(c));
 399                 if (get_value(fn, data, var) < 0)
 400                         break;
 401         }
 402         die("bad config file line %d in %s", cf->linenr, cf->name);
 403 }
 404
 405 static int parse_unit_factor(const char *end, uintmax_t *val)
 406 {
 407         if (!*end)
 408                 return 1;
 409         else if (!strcasecmp(end, "k")) {
 410                 *val *= 1024;
 411                 return 1;
 412         }
 413         else if (!strcasecmp(end, "m")) {
 414                 *val *= 1024 * 1024;
 415                 return 1;
 416         }
 417         else if (!strcasecmp(end, "g")) {
 418                 *val *= 1024 * 1024 * 1024;
 419                 return 1;
 420         }
 421         return 0;
 422 }
 423
 424 static int git_parse_long(const char *value, long *ret)
 425 {
 426         if (value && *value) {
 427                 char *end;
 428                 intmax_t val;
 429                 uintmax_t uval;
 430                 uintmax_t factor = 1;
 431
 432                 errno = 0;
 433                 val = strtoimax(value, &end, 0);
 434                 if (errno == ERANGE)
 435                         return 0;
 436                 if (!parse_unit_factor(end, &factor))
 437                         return 0;
 438                 uval = abs(val);
 439                 uval *= factor;
 440                 if ((uval > maximum_signed_value_of_type(long)) ||
 441                     (abs(val) > uval))
 442                         return 0;
 443                 val *= factor;
 444                 *ret = val;
 445                 return 1;
 446         }
 447         return 0;
 448 }
 449
 450 int git_parse_ulong(const char *value, unsigned long *ret)
 451 {
 452         if (value && *value) {
 453                 char *end;
 454                 uintmax_t val;
 455                 uintmax_t oldval;
 456
 457                 errno = 0;
 458                 val = strtoumax(value, &end, 0);
 459                 if (errno == ERANGE)
 460                         return 0;
 461                 oldval = val;
 462                 if (!parse_unit_factor(end, &val))
 463                         return 0;
 464                 if ((val > maximum_unsigned_value_of_type(long)) ||
 465                     (oldval > val))
 466                         return 0;
 467                 *ret = val;
 468                 return 1;
 469         }
 470         return 0;
 471 }
 472
 473 static void die_bad_config(const char *name)
 474 {
 475         if (cf && cf->name)
 476                 die("bad config value for '%s' in %s", name, cf->name);
 477         die("bad config value for '%s'", name);
 478 }
 479
 480 int git_config_int(const char *name, const char *value)
 481 {
 482         long ret = 0;
 483         if (!git_parse_long(value, &ret))
 484                 die_bad_config(name);
 485         return ret;
 486 }
 487
 488 unsigned long git_config_ulong(const char *name, const char *value)
 489 {
 490         unsigned long ret;
 491         if (!git_parse_ulong(value, &ret))
 492                 die_bad_config(name);
 493         return ret;
 494 }
 495
 496 static int git_config_maybe_bool_text(const char *name, const char *value)
 497 {
 498         if (!value)
 499                 return 1;
 500         if (!*value)
 501                 return 0;
 502         if (!strcasecmp(value, "true")
 503             || !strcasecmp(value, "yes")
 504             || !strcasecmp(value, "on"))
 505                 return 1;
 506         if (!strcasecmp(value, "false")
 507             || !strcasecmp(value, "no")
 508             || !strcasecmp(value, "off"))
 509                 return 0;
 510         return -1;
 511 }
 512
 513 int git_config_maybe_bool(const char *name, const char *value)
 514 {
 515         long v = git_config_maybe_bool_text(name, value);
 516         if (0 <= v)
 517                 return v;
 518         if (git_parse_long(value, &v))
 519                 return !!v;
 520         return -1;
 521 }
 522
 523 int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 524 {
 525         int v = git_config_maybe_bool_text(name, value);
 526         if (0 <= v) {
 527                 *is_bool = 1;
 528                 return v;
 529         }
 530         *is_bool = 0;
 531         return git_config_int(name, value);
 532 }
 533
 534 int git_config_bool(const char *name, const char *value)
 535 {
 536         int discard;
 537         return !!git_config_bool_or_int(name, value, &discard);
 538 }
 539
 540 int git_config_string(const char **dest, const char *var, const char *value)
 541 {
 542         if (!value)
 543                 return config_error_nonbool(var);
 544         *dest = xstrdup(value);
 545         return 0;
 546 }
 547
 548 int git_config_pathname(const char **dest, const char *var, const char *value)
 549 {
 550         if (!value)
 551                 return config_error_nonbool(var);
 552         *dest = expand_user_path(value);
 553         if (!*dest)
 554                 die("Failed to expand user dir in: '%s'", value);
 555         return 0;
 556 }
 557
 558 static int git_default_core_config(const char *var, const char *value)
 559 {
 560         /* This needs a better name */
 561         if (!strcmp(var, "core.filemode")) {
 562                 trust_executable_bit = git_config_bool(var, value);
 563                 return 0;
 564         }
 565         if (!strcmp(var, "core.trustctime")) {
 566                 trust_ctime = git_config_bool(var, value);
 567                 return 0;
 568         }
 569         if (!strcmp(var, "core.statinfo")) {
 570                 if (!strcasecmp(value, "default"))
 571                         check_stat = 1;
 572                 else if (!strcasecmp(value, "minimal"))
 573                         check_stat = 0;
 574         }
 575
 576         if (!strcmp(var, "core.quotepath")) {
 577                 quote_path_fully = git_config_bool(var, value);
 578                 return 0;
 579         }
 580
 581         if (!strcmp(var, "core.symlinks")) {
 582                 has_symlinks = git_config_bool(var, value);
 583                 return 0;
 584         }
 585
 586         if (!strcmp(var, "core.ignorecase")) {
 587                 ignore_case = git_config_bool(var, value);
 588                 return 0;
 589         }
 590
 591         if (!strcmp(var, "core.attributesfile"))
 592                 return git_config_pathname(&git_attributes_file, var, value);
 593
 594         if (!strcmp(var, "core.bare")) {
 595                 is_bare_repository_cfg = git_config_bool(var, value);
 596                 return 0;
 597         }
 598
 599         if (!strcmp(var, "core.ignorestat")) {
 600                 assume_unchanged = git_config_bool(var, value);
 601                 return 0;
 602         }
 603
 604         if (!strcmp(var, "core.prefersymlinkrefs")) {
 605                 prefer_symlink_refs = git_config_bool(var, value);
 606                 return 0;
 607         }
 608
 609         if (!strcmp(var, "core.logallrefupdates")) {
 610                 log_all_ref_updates = git_config_bool(var, value);
 611                 return 0;
 612         }
 613
 614         if (!strcmp(var, "core.warnambiguousrefs")) {
 615                 warn_ambiguous_refs = git_config_bool(var, value);
 616                 return 0;
 617         }
 618
 619         if (!strcmp(var, "core.abbrev")) {
 620                 int abbrev = git_config_int(var, value);
 621                 if (abbrev < minimum_abbrev || abbrev > 40)
 622                         return -1;
 623                 default_abbrev = abbrev;
 624                 return 0;
 625         }
 626
 627         if (!strcmp(var, "core.loosecompression")) {
 628                 int level = git_config_int(var, value);
 629                 if (level == -1)
 630                         level = Z_DEFAULT_COMPRESSION;
 631                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 632                         die("bad zlib compression level %d", level);
 633                 zlib_compression_level = level;
 634                 zlib_compression_seen = 1;
 635                 return 0;
 636         }
 637
 638         if (!strcmp(var, "core.compression")) {
 639                 int level = git_config_int(var, value);
 640                 if (level == -1)
 641                         level = Z_DEFAULT_COMPRESSION;
 642                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 643                         die("bad zlib compression level %d", level);
 644                 core_compression_level = level;
 645                 core_compression_seen = 1;
 646                 if (!zlib_compression_seen)
 647                         zlib_compression_level = level;
 648                 return 0;
 649         }
 650
 651         if (!strcmp(var, "core.packedgitwindowsize")) {
 652                 int pgsz_x2 = getpagesize() * 2;
 653                 packed_git_window_size = git_config_ulong(var, value);
 654
 655                 /* This value must be multiple of (pagesize * 2) */
 656                 packed_git_window_size /= pgsz_x2;
 657                 if (packed_git_window_size < 1)
 658                         packed_git_window_size = 1;
 659                 packed_git_window_size *= pgsz_x2;
 660                 return 0;
 661         }
 662
 663         if (!strcmp(var, "core.bigfilethreshold")) {
 664                 big_file_threshold = git_config_ulong(var, value);
 665                 return 0;
 666         }
 667
 668         if (!strcmp(var, "core.packedgitlimit")) {
 669                 packed_git_limit = git_config_ulong(var, value);
 670                 return 0;
 671         }
 672
 673         if (!strcmp(var, "core.deltabasecachelimit")) {
 674                 delta_base_cache_limit = git_config_ulong(var, value);
 675                 return 0;
 676         }
 677
 678         if (!strcmp(var, "core.logpackaccess"))
 679                 return git_config_string(&log_pack_access, var, value);
 680
 681         if (!strcmp(var, "core.autocrlf")) {
 682                 if (value && !strcasecmp(value, "input")) {
 683                         if (core_eol == EOL_CRLF)
 684                                 return error("core.autocrlf=input conflicts with core.eol=crlf");
 685                         auto_crlf = AUTO_CRLF_INPUT;
 686                         return 0;
 687                 }
 688                 auto_crlf = git_config_bool(var, value);
 689                 return 0;
 690         }
 691
 692         if (!strcmp(var, "core.safecrlf")) {
 693                 if (value && !strcasecmp(value, "warn")) {
 694                         safe_crlf = SAFE_CRLF_WARN;
 695                         return 0;
 696                 }
 697                 safe_crlf = git_config_bool(var, value);
 698                 return 0;
 699         }
 700
 701         if (!strcmp(var, "core.eol")) {
 702                 if (value && !strcasecmp(value, "lf"))
 703                         core_eol = EOL_LF;
 704                 else if (value && !strcasecmp(value, "crlf"))
 705                         core_eol = EOL_CRLF;
 706                 else if (value && !strcasecmp(value, "native"))
 707                         core_eol = EOL_NATIVE;
 708                 else
 709                         core_eol = EOL_UNSET;
 710                 if (core_eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 711                         return error("core.autocrlf=input conflicts with core.eol=crlf");
 712                 return 0;
 713         }
 714
 715         if (!strcmp(var, "core.notesref")) {
 716                 notes_ref_name = xstrdup(value);
 717                 return 0;
 718         }
 719
 720         if (!strcmp(var, "core.pager"))
 721                 return git_config_string(&pager_program, var, value);
 722
 723         if (!strcmp(var, "core.editor"))
 724                 return git_config_string(&editor_program, var, value);
 725
 726         if (!strcmp(var, "core.commentchar")) {
 727                 const char *comment;
 728                 int ret = git_config_string(&comment, var, value);
 729                 if (!ret)
 730                         comment_line_char = comment[0];
 731                 return ret;
 732         }
 733
 734         if (!strcmp(var, "core.askpass"))
 735                 return git_config_string(&askpass_program, var, value);
 736
 737         if (!strcmp(var, "core.excludesfile"))
 738                 return git_config_pathname(&excludes_file, var, value);
 739
 740         if (!strcmp(var, "core.whitespace")) {
 741                 if (!value)
 742                         return config_error_nonbool(var);
 743                 whitespace_rule_cfg = parse_whitespace_rule(value);
 744                 return 0;
 745         }
 746
 747         if (!strcmp(var, "core.fsyncobjectfiles")) {
 748                 fsync_object_files = git_config_bool(var, value);
 749                 return 0;
 750         }
 751
 752         if (!strcmp(var, "core.preloadindex")) {
 753                 core_preload_index = git_config_bool(var, value);
 754                 return 0;
 755         }
 756
 757         if (!strcmp(var, "core.createobject")) {
 758                 if (!strcmp(value, "rename"))
 759                         object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 760                 else if (!strcmp(value, "link"))
 761                         object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 762                 else
 763                         die("Invalid mode for object creation: %s", value);
 764                 return 0;
 765         }
 766
 767         if (!strcmp(var, "core.sparsecheckout")) {
 768                 core_apply_sparse_checkout = git_config_bool(var, value);
 769                 return 0;
 770         }
 771
 772         if (!strcmp(var, "core.precomposeunicode")) {
 773                 precomposed_unicode = git_config_bool(var, value);
 774                 return 0;
 775         }
 776
 777         /* Add other config variables here and to Documentation/config.txt. */
 778         return 0;
 779 }
 780
 781 static int git_default_i18n_config(const char *var, const char *value)
 782 {
 783         if (!strcmp(var, "i18n.commitencoding"))
 784                 return git_config_string(&git_commit_encoding, var, value);
 785
 786         if (!strcmp(var, "i18n.logoutputencoding"))
 787                 return git_config_string(&git_log_output_encoding, var, value);
 788
 789         /* Add other config variables here and to Documentation/config.txt. */
 790         return 0;
 791 }
 792
 793 static int git_default_branch_config(const char *var, const char *value)
 794 {
 795         if (!strcmp(var, "branch.autosetupmerge")) {
 796                 if (value && !strcasecmp(value, "always")) {
 797                         git_branch_track = BRANCH_TRACK_ALWAYS;
 798                         return 0;
 799                 }
 800                 git_branch_track = git_config_bool(var, value);
 801                 return 0;
 802         }
 803         if (!strcmp(var, "branch.autosetuprebase")) {
 804                 if (!value)
 805                         return config_error_nonbool(var);
 806                 else if (!strcmp(value, "never"))
 807                         autorebase = AUTOREBASE_NEVER;
 808                 else if (!strcmp(value, "local"))
 809                         autorebase = AUTOREBASE_LOCAL;
 810                 else if (!strcmp(value, "remote"))
 811                         autorebase = AUTOREBASE_REMOTE;
 812                 else if (!strcmp(value, "always"))
 813                         autorebase = AUTOREBASE_ALWAYS;
 814                 else
 815                         return error("Malformed value for %s", var);
 816                 return 0;
 817         }
 818
 819         /* Add other config variables here and to Documentation/config.txt. */
 820         return 0;
 821 }
 822
 823 static int git_default_push_config(const char *var, const char *value)
 824 {
 825         if (!strcmp(var, "push.default")) {
 826                 if (!value)
 827                         return config_error_nonbool(var);
 828                 else if (!strcmp(value, "nothing"))
 829                         push_default = PUSH_DEFAULT_NOTHING;
 830                 else if (!strcmp(value, "matching"))
 831                         push_default = PUSH_DEFAULT_MATCHING;
 832                 else if (!strcmp(value, "simple"))
 833                         push_default = PUSH_DEFAULT_SIMPLE;
 834                 else if (!strcmp(value, "upstream"))
 835                         push_default = PUSH_DEFAULT_UPSTREAM;
 836                 else if (!strcmp(value, "tracking")) /* deprecated */
 837                         push_default = PUSH_DEFAULT_UPSTREAM;
 838                 else if (!strcmp(value, "current"))
 839                         push_default = PUSH_DEFAULT_CURRENT;
 840                 else {
 841                         error("Malformed value for %s: %s", var, value);
 842                         return error("Must be one of nothing, matching, simple, "
 843                                      "upstream or current.");
 844                 }
 845                 return 0;
 846         }
 847
 848         /* Add other config variables here and to Documentation/config.txt. */
 849         return 0;
 850 }
 851
 852 static int git_default_mailmap_config(const char *var, const char *value)
 853 {
 854         if (!strcmp(var, "mailmap.file"))
 855                 return git_config_string(&git_mailmap_file, var, value);
 856         if (!strcmp(var, "mailmap.blob"))
 857                 return git_config_string(&git_mailmap_blob, var, value);
 858
 859         /* Add other config variables here and to Documentation/config.txt. */
 860         return 0;
 861 }
 862
 863 int git_default_config(const char *var, const char *value, void *dummy)
 864 {
 865         if (!prefixcmp(var, "core."))
 866                 return git_default_core_config(var, value);
 867
 868         if (!prefixcmp(var, "user."))
 869                 return git_ident_config(var, value, dummy);
 870
 871         if (!prefixcmp(var, "i18n."))
 872                 return git_default_i18n_config(var, value);
 873
 874         if (!prefixcmp(var, "branch."))
 875                 return git_default_branch_config(var, value);
 876
 877         if (!prefixcmp(var, "push."))
 878                 return git_default_push_config(var, value);
 879
 880         if (!prefixcmp(var, "mailmap."))
 881                 return git_default_mailmap_config(var, value);
 882
 883         if (!prefixcmp(var, "advice."))
 884                 return git_default_advice_config(var, value);
 885
 886         if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 887                 pager_use_color = git_config_bool(var,value);
 888                 return 0;
 889         }
 890
 891         if (!strcmp(var, "pack.packsizelimit")) {
 892                 pack_size_limit_cfg = git_config_ulong(var, value);
 893                 return 0;
 894         }
 895         /* Add other config variables here and to Documentation/config.txt. */
 896         return 0;
 897 }
 898
 899 /*
 900  * The fields f and name of top need to be initialized before calling
 901  * this function.
 902  */
 903 static int do_config_from(struct config_file *top, config_fn_t fn, void *data)
 904 {
 905         int ret;
 906
 907         /* push config-file parsing state stack */
 908         top->prev = cf;
 909         top->linenr = 1;
 910         top->eof = 0;
 911         strbuf_init(&top->value, 1024);
 912         strbuf_init(&top->var, 1024);
 913         cf = top;
 914
 915         ret = git_parse_file(fn, data);
 916
 917         /* pop config-file parsing state stack */
 918         strbuf_release(&top->value);
 919         strbuf_release(&top->var);
 920         cf = top->prev;
 921
 922         return ret;
 923 }
 924
 925 int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 926 {
 927         int ret;
 928         FILE *f = fopen(filename, "r");
 929
 930         ret = -1;
 931         if (f) {
 932                 config_file top;
 933
 934                 top.f = f;
 935                 top.name = filename;
 936
 937                 ret = do_config_from(&top, fn, data);
 938
 939                 fclose(f);
 940         }
 941         return ret;
 942 }
 943
 944 const char *git_etc_gitconfig(void)
 945 {
 946         static const char *system_wide;
 947         if (!system_wide)
 948                 system_wide = system_path(ETC_GITCONFIG);
 949         return system_wide;
 950 }
 951
 952 int git_env_bool(const char *k, int def)
 953 {
 954         const char *v = getenv(k);
 955         return v ? git_config_bool(k, v) : def;
 956 }
 957
 958 int git_config_system(void)
 959 {
 960         return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 961 }
 962
 963 int git_config_early(config_fn_t fn, void *data, const char *repo_config)
 964 {
 965         int ret = 0, found = 0;
 966         char *xdg_config = NULL;
 967         char *user_config = NULL;
 968
 969         home_config_paths(&user_config, &xdg_config, "config");
 970
 971         if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK)) {
 972                 ret += git_config_from_file(fn, git_etc_gitconfig(),
 973                                             data);
 974                 found += 1;
 975         }
 976
 977         if (xdg_config && !access_or_die(xdg_config, R_OK)) {
 978                 ret += git_config_from_file(fn, xdg_config, data);
 979                 found += 1;
 980         }
 981
 982         if (user_config && !access_or_die(user_config, R_OK)) {
 983                 ret += git_config_from_file(fn, user_config, data);
 984                 found += 1;
 985         }
 986
 987         if (repo_config && !access_or_die(repo_config, R_OK)) {
 988                 ret += git_config_from_file(fn, repo_config, data);
 989                 found += 1;
 990         }
 991
 992         switch (git_config_from_parameters(fn, data)) {
 993         case -1: /* error */
 994                 die("unable to parse command-line config");
 995                 break;
 996         case 0: /* found nothing */
 997                 break;
 998         default: /* found at least one item */
 999                 found++;
1000                 break;
1001         }
1002
1003         free(xdg_config);
1004         free(user_config);
1005         return ret == 0 ? found : ret;
1006 }
1007
1008 int git_config_with_options(config_fn_t fn, void *data,
1009                             const char *filename, int respect_includes)
1010 {
1011         char *repo_config = NULL;
1012         int ret;
1013         struct config_include_data inc = CONFIG_INCLUDE_INIT;
1014
1015         if (respect_includes) {
1016                 inc.fn = fn;
1017                 inc.data = data;
1018                 fn = git_config_include;
1019                 data = &inc;
1020         }
1021
1022         /*
1023          * If we have a specific filename, use it. Otherwise, follow the
1024          * regular lookup sequence.
1025          */
1026         if (filename)
1027                 return git_config_from_file(fn, filename, data);
1028
1029         repo_config = git_pathdup("config");
1030         ret = git_config_early(fn, data, repo_config);
1031         if (repo_config)
1032                 free(repo_config);
1033         return ret;
1034 }
1035
1036 int git_config(config_fn_t fn, void *data)
1037 {
1038         return git_config_with_options(fn, data, NULL, 1);
1039 }
1040
1041 /*
1042  * Find all the stuff for git_config_set() below.
1043  */
1044
1045 #define MAX_MATCHES 512
1046
1047 static struct {
1048         int baselen;
1049         char *key;
1050         int do_not_match;
1051         regex_t *value_regex;
1052         int multi_replace;
1053         size_t offset[MAX_MATCHES];
1054         enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
1055         int seen;
1056 } store;
1057
1058 static int matches(const char *key, const char *value)
1059 {
1060         return !strcmp(key, store.key) &&
1061                 (store.value_regex == NULL ||
1062                  (store.do_not_match ^
1063                   !regexec(store.value_regex, value, 0, NULL, 0)));
1064 }
1065
1066 static int store_aux(const char *key, const char *value, void *cb)
1067 {
1068         const char *ep;
1069         size_t section_len;
1070         FILE *f = cf->f;
1071
1072         switch (store.state) {
1073         case KEY_SEEN:
1074                 if (matches(key, value)) {
1075                         if (store.seen == 1 && store.multi_replace == 0) {
1076                                 warning("%s has multiple values", key);
1077                         } else if (store.seen >= MAX_MATCHES) {
1078                                 error("too many matches for %s", key);
1079                                 return 1;
1080                         }
1081
1082                         store.offset[store.seen] = ftell(f);
1083                         store.seen++;
1084                 }
1085                 break;
1086         case SECTION_SEEN:
1087                 /*
1088                  * What we are looking for is in store.key (both
1089                  * section and var), and its section part is baselen
1090                  * long.  We found key (again, both section and var).
1091                  * We would want to know if this key is in the same
1092                  * section as what we are looking for.  We already
1093                  * know we are in the same section as what should
1094                  * hold store.key.
1095                  */
1096                 ep = strrchr(key, '.');
1097                 section_len = ep - key;
1098
1099                 if ((section_len != store.baselen) ||
1100                     memcmp(key, store.key, section_len+1)) {
1101                         store.state = SECTION_END_SEEN;
1102                         break;
1103                 }
1104
1105                 /*
1106                  * Do not increment matches: this is no match, but we
1107                  * just made sure we are in the desired section.
1108                  */
1109                 store.offset[store.seen] = ftell(f);
1110                 /* fallthru */
1111         case SECTION_END_SEEN:
1112         case START:
1113                 if (matches(key, value)) {
1114                         store.offset[store.seen] = ftell(f);
1115                         store.state = KEY_SEEN;
1116                         store.seen++;
1117                 } else {
1118                         if (strrchr(key, '.') - key == store.baselen &&
1119                               !strncmp(key, store.key, store.baselen)) {
1120                                         store.state = SECTION_SEEN;
1121                                         store.offset[store.seen] = ftell(f);
1122                         }
1123                 }
1124         }
1125         return 0;
1126 }
1127
1128 static int write_error(const char *filename)
1129 {
1130         error("failed to write new configuration file %s", filename);
1131
1132         /* Same error code as "failed to rename". */
1133         return 4;
1134 }
1135
1136 static int store_write_section(int fd, const char *key)
1137 {
1138         const char *dot;
1139         int i, success;
1140         struct strbuf sb = STRBUF_INIT;
1141
1142         dot = memchr(key, '.', store.baselen);
1143         if (dot) {
1144                 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1145                 for (i = dot - key + 1; i < store.baselen; i++) {
1146                         if (key[i] == '"' || key[i] == '\\')
1147                                 strbuf_addch(&sb, '\\');
1148                         strbuf_addch(&sb, key[i]);
1149                 }
1150                 strbuf_addstr(&sb, "\"]\n");
1151         } else {
1152                 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1153         }
1154
1155         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1156         strbuf_release(&sb);
1157
1158         return success;
1159 }
1160
1161 static int store_write_pair(int fd, const char *key, const char *value)
1162 {
1163         int i, success;
1164         int length = strlen(key + store.baselen + 1);
1165         const char *quote = "";
1166         struct strbuf sb = STRBUF_INIT;
1167
1168         /*
1169          * Check to see if the value needs to be surrounded with a dq pair.
1170          * Note that problematic characters are always backslash-quoted; this
1171          * check is about not losing leading or trailing SP and strings that
1172          * follow beginning-of-comment characters (i.e. ';' and '#') by the
1173          * configuration parser.
1174          */
1175         if (value[0] == ' ')
1176                 quote = "\"";
1177         for (i = 0; value[i]; i++)
1178                 if (value[i] == ';' || value[i] == '#')
1179                         quote = "\"";
1180         if (i && value[i - 1] == ' ')
1181                 quote = "\"";
1182
1183         strbuf_addf(&sb, "\t%.*s = %s",
1184                     length, key + store.baselen + 1, quote);
1185
1186         for (i = 0; value[i]; i++)
1187                 switch (value[i]) {
1188                 case '\n':
1189                         strbuf_addstr(&sb, "\\n");
1190                         break;
1191                 case '\t':
1192                         strbuf_addstr(&sb, "\\t");
1193                         break;
1194                 case '"':
1195                 case '\\':
1196                         strbuf_addch(&sb, '\\');
1197                 default:
1198                         strbuf_addch(&sb, value[i]);
1199                         break;
1200                 }
1201         strbuf_addf(&sb, "%s\n", quote);
1202
1203         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1204         strbuf_release(&sb);
1205
1206         return success;
1207 }
1208
1209 static ssize_t find_beginning_of_line(const char *contents, size_t size,
1210         size_t offset_, int *found_bracket)
1211 {
1212         size_t equal_offset = size, bracket_offset = size;
1213         ssize_t offset;
1214
1215 contline:
1216         for (offset = offset_-2; offset > 0
1217                         && contents[offset] != '\n'; offset--)
1218                 switch (contents[offset]) {
1219                         case '=': equal_offset = offset; break;
1220                         case ']': bracket_offset = offset; break;
1221                 }
1222         if (offset > 0 && contents[offset-1] == '\\') {
1223                 offset_ = offset;
1224                 goto contline;
1225         }
1226         if (bracket_offset < equal_offset) {
1227                 *found_bracket = 1;
1228                 offset = bracket_offset+1;
1229         } else
1230                 offset++;
1231
1232         return offset;
1233 }
1234
1235 int git_config_set_in_file(const char *config_filename,
1236                         const char *key, const char *value)
1237 {
1238         return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1239 }
1240
1241 int git_config_set(const char *key, const char *value)
1242 {
1243         return git_config_set_multivar(key, value, NULL, 0);
1244 }
1245
1246 /*
1247  * Auxiliary function to sanity-check and split the key into the section
1248  * identifier and variable name.
1249  *
1250  * Returns 0 on success, -1 when there is an invalid character in the key and
1251  * -2 if there is no section name in the key.
1252  *
1253  * store_key - pointer to char* which will hold a copy of the key with
1254  *             lowercase section and variable name
1255  * baselen - pointer to int which will hold the length of the
1256  *           section + subsection part, can be NULL
1257  */
1258 int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1259 {
1260         int i, dot, baselen;
1261         const char *last_dot = strrchr(key, '.');
1262
1263         /*
1264          * Since "key" actually contains the section name and the real
1265          * key name separated by a dot, we have to know where the dot is.
1266          */
1267
1268         if (last_dot == NULL || last_dot == key) {
1269                 error("key does not contain a section: %s", key);
1270                 return -CONFIG_NO_SECTION_OR_NAME;
1271         }
1272
1273         if (!last_dot[1]) {
1274                 error("key does not contain variable name: %s", key);
1275                 return -CONFIG_NO_SECTION_OR_NAME;
1276         }
1277
1278         baselen = last_dot - key;
1279         if (baselen_)
1280                 *baselen_ = baselen;
1281
1282         /*
1283          * Validate the key and while at it, lower case it for matching.
1284          */
1285         *store_key = xmalloc(strlen(key) + 1);
1286
1287         dot = 0;
1288         for (i = 0; key[i]; i++) {
1289                 unsigned char c = key[i];
1290                 if (c == '.')
1291                         dot = 1;
1292                 /* Leave the extended basename untouched.. */
1293                 if (!dot || i > baselen) {
1294                         if (!iskeychar(c) ||
1295                             (i == baselen + 1 && !isalpha(c))) {
1296                                 error("invalid key: %s", key);
1297                                 goto out_free_ret_1;
1298                         }
1299                         c = tolower(c);
1300                 } else if (c == '\n') {
1301                         error("invalid key (newline): %s", key);
1302                         goto out_free_ret_1;
1303                 }
1304                 (*store_key)[i] = c;
1305         }
1306         (*store_key)[i] = 0;
1307
1308         return 0;
1309
1310 out_free_ret_1:
1311         free(*store_key);
1312         *store_key = NULL;
1313         return -CONFIG_INVALID_KEY;
1314 }
1315
1316 /*
1317  * If value==NULL, unset in (remove from) config,
1318  * if value_regex!=NULL, disregard key/value pairs where value does not match.
1319  * if multi_replace==0, nothing, or only one matching key/value is replaced,
1320  *     else all matching key/values (regardless how many) are removed,
1321  *     before the new pair is written.
1322  *
1323  * Returns 0 on success.
1324  *
1325  * This function does this:
1326  *
1327  * - it locks the config file by creating ".git/config.lock"
1328  *
1329  * - it then parses the config using store_aux() as validator to find
1330  *   the position on the key/value pair to replace. If it is to be unset,
1331  *   it must be found exactly once.
1332  *
1333  * - the config file is mmap()ed and the part before the match (if any) is
1334  *   written to the lock file, then the changed part and the rest.
1335  *
1336  * - the config file is removed and the lock file rename()d to it.
1337  *
1338  */
1339 int git_config_set_multivar_in_file(const char *config_filename,
1340                                 const char *key, const char *value,
1341                                 const char *value_regex, int multi_replace)
1342 {
1343         int fd = -1, in_fd;
1344         int ret;
1345         struct lock_file *lock = NULL;
1346         char *filename_buf = NULL;
1347
1348         /* parse-key returns negative; flip the sign to feed exit(3) */
1349         ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1350         if (ret)
1351                 goto out_free;
1352
1353         store.multi_replace = multi_replace;
1354
1355         if (!config_filename)
1356                 config_filename = filename_buf = git_pathdup("config");
1357
1358         /*
1359          * The lock serves a purpose in addition to locking: the new
1360          * contents of .git/config will be written into it.
1361          */
1362         lock = xcalloc(sizeof(struct lock_file), 1);
1363         fd = hold_lock_file_for_update(lock, config_filename, 0);
1364         if (fd < 0) {
1365                 error("could not lock config file %s: %s", config_filename, strerror(errno));
1366                 free(store.key);
1367                 ret = CONFIG_NO_LOCK;
1368                 goto out_free;
1369         }
1370
1371         /*
1372          * If .git/config does not exist yet, write a minimal version.
1373          */
1374         in_fd = open(config_filename, O_RDONLY);
1375         if ( in_fd < 0 ) {
1376                 free(store.key);
1377
1378                 if ( ENOENT != errno ) {
1379                         error("opening %s: %s", config_filename,
1380                               strerror(errno));
1381                         ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1382                         goto out_free;
1383                 }
1384                 /* if nothing to unset, error out */
1385                 if (value == NULL) {
1386                         ret = CONFIG_NOTHING_SET;
1387                         goto out_free;
1388                 }
1389
1390                 store.key = (char *)key;
1391                 if (!store_write_section(fd, key) ||
1392                     !store_write_pair(fd, key, value))
1393                         goto write_err_out;
1394         } else {
1395                 struct stat st;
1396                 char *contents;
1397                 size_t contents_sz, copy_begin, copy_end;
1398                 int i, new_line = 0;
1399
1400                 if (value_regex == NULL)
1401                         store.value_regex = NULL;
1402                 else {
1403                         if (value_regex[0] == '!') {
1404                                 store.do_not_match = 1;
1405                                 value_regex++;
1406                         } else
1407                                 store.do_not_match = 0;
1408
1409                         store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1410                         if (regcomp(store.value_regex, value_regex,
1411                                         REG_EXTENDED)) {
1412                                 error("invalid pattern: %s", value_regex);
1413                                 free(store.value_regex);
1414                                 ret = CONFIG_INVALID_PATTERN;
1415                                 goto out_free;
1416                         }
1417                 }
1418
1419                 store.offset[0] = 0;
1420                 store.state = START;
1421                 store.seen = 0;
1422
1423                 /*
1424                  * After this, store.offset will contain the *end* offset
1425                  * of the last match, or remain at 0 if no match was found.
1426                  * As a side effect, we make sure to transform only a valid
1427                  * existing config file.
1428                  */
1429                 if (git_config_from_file(store_aux, config_filename, NULL)) {
1430                         error("invalid config file %s", config_filename);
1431                         free(store.key);
1432                         if (store.value_regex != NULL) {
1433                                 regfree(store.value_regex);
1434                                 free(store.value_regex);
1435                         }
1436                         ret = CONFIG_INVALID_FILE;
1437                         goto out_free;
1438                 }
1439
1440                 free(store.key);
1441                 if (store.value_regex != NULL) {
1442                         regfree(store.value_regex);
1443                         free(store.value_regex);
1444                 }
1445
1446                 /* if nothing to unset, or too many matches, error out */
1447                 if ((store.seen == 0 && value == NULL) ||
1448                                 (store.seen > 1 && multi_replace == 0)) {
1449                         ret = CONFIG_NOTHING_SET;
1450                         goto out_free;
1451                 }
1452
1453                 fstat(in_fd, &st);
1454                 contents_sz = xsize_t(st.st_size);
1455                 contents = xmmap(NULL, contents_sz, PROT_READ,
1456                         MAP_PRIVATE, in_fd, 0);
1457                 close(in_fd);
1458
1459                 if (store.seen == 0)
1460                         store.seen = 1;
1461
1462                 for (i = 0, copy_begin = 0; i < store.seen; i++) {
1463                         if (store.offset[i] == 0) {
1464                                 store.offset[i] = copy_end = contents_sz;
1465                         } else if (store.state != KEY_SEEN) {
1466                                 copy_end = store.offset[i];
1467                         } else
1468                                 copy_end = find_beginning_of_line(
1469                                         contents, contents_sz,
1470                                         store.offset[i]-2, &new_line);
1471
1472                         if (copy_end > 0 && contents[copy_end-1] != '\n')
1473                                 new_line = 1;
1474
1475                         /* write the first part of the config */
1476                         if (copy_end > copy_begin) {
1477                                 if (write_in_full(fd, contents + copy_begin,
1478                                                   copy_end - copy_begin) <
1479                                     copy_end - copy_begin)
1480                                         goto write_err_out;
1481                                 if (new_line &&
1482                                     write_str_in_full(fd, "\n") != 1)
1483                                         goto write_err_out;
1484                         }
1485                         copy_begin = store.offset[i];
1486                 }
1487
1488                 /* write the pair (value == NULL means unset) */
1489                 if (value != NULL) {
1490                         if (store.state == START) {
1491                                 if (!store_write_section(fd, key))
1492                                         goto write_err_out;
1493                         }
1494                         if (!store_write_pair(fd, key, value))
1495                                 goto write_err_out;
1496                 }
1497
1498                 /* write the rest of the config */
1499                 if (copy_begin < contents_sz)
1500                         if (write_in_full(fd, contents + copy_begin,
1501                                           contents_sz - copy_begin) <
1502                             contents_sz - copy_begin)
1503                                 goto write_err_out;
1504
1505                 munmap(contents, contents_sz);
1506         }
1507
1508         if (commit_lock_file(lock) < 0) {
1509                 error("could not commit config file %s", config_filename);
1510                 ret = CONFIG_NO_WRITE;
1511                 goto out_free;
1512         }
1513
1514         /*
1515          * lock is committed, so don't try to roll it back below.
1516          * NOTE: Since lockfile.c keeps a linked list of all created
1517          * lock_file structures, it isn't safe to free(lock).  It's
1518          * better to just leave it hanging around.
1519          */
1520         lock = NULL;
1521         ret = 0;
1522
1523 out_free:
1524         if (lock)
1525                 rollback_lock_file(lock);
1526         free(filename_buf);
1527         return ret;
1528
1529 write_err_out:
1530         ret = write_error(lock->filename);
1531         goto out_free;
1532
1533 }
1534
1535 int git_config_set_multivar(const char *key, const char *value,
1536                         const char *value_regex, int multi_replace)
1537 {
1538         return git_config_set_multivar_in_file(NULL, key, value, value_regex,
1539                                                multi_replace);
1540 }
1541
1542 static int section_name_match (const char *buf, const char *name)
1543 {
1544         int i = 0, j = 0, dot = 0;
1545         if (buf[i] != '[')
1546                 return 0;
1547         for (i = 1; buf[i] && buf[i] != ']'; i++) {
1548                 if (!dot && isspace(buf[i])) {
1549                         dot = 1;
1550                         if (name[j++] != '.')
1551                                 break;
1552                         for (i++; isspace(buf[i]); i++)
1553                                 ; /* do nothing */
1554                         if (buf[i] != '"')
1555                                 break;
1556                         continue;
1557                 }
1558                 if (buf[i] == '\\' && dot)
1559                         i++;
1560                 else if (buf[i] == '"' && dot) {
1561                         for (i++; isspace(buf[i]); i++)
1562                                 ; /* do_nothing */
1563                         break;
1564                 }
1565                 if (buf[i] != name[j++])
1566                         break;
1567         }
1568         if (buf[i] == ']' && name[j] == 0) {
1569                 /*
1570                  * We match, now just find the right length offset by
1571                  * gobbling up any whitespace after it, as well
1572                  */
1573                 i++;
1574                 for (; buf[i] && isspace(buf[i]); i++)
1575                         ; /* do nothing */
1576                 return i;
1577         }
1578         return 0;
1579 }
1580
1581 static int section_name_is_ok(const char *name)
1582 {
1583         /* Empty section names are bogus. */
1584         if (!*name)
1585                 return 0;
1586
1587         /*
1588          * Before a dot, we must be alphanumeric or dash. After the first dot,
1589          * anything goes, so we can stop checking.
1590          */
1591         for (; *name && *name != '.'; name++)
1592                 if (*name != '-' && !isalnum(*name))
1593                         return 0;
1594         return 1;
1595 }
1596
1597 /* if new_name == NULL, the section is removed instead */
1598 int git_config_rename_section_in_file(const char *config_filename,
1599                                       const char *old_name, const char *new_name)
1600 {
1601         int ret = 0, remove = 0;
1602         char *filename_buf = NULL;
1603         struct lock_file *lock;
1604         int out_fd;
1605         char buf[1024];
1606         FILE *config_file;
1607
1608         if (new_name && !section_name_is_ok(new_name)) {
1609                 ret = error("invalid section name: %s", new_name);
1610                 goto out;
1611         }
1612
1613         if (!config_filename)
1614                 config_filename = filename_buf = git_pathdup("config");
1615
1616         lock = xcalloc(sizeof(struct lock_file), 1);
1617         out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1618         if (out_fd < 0) {
1619                 ret = error("could not lock config file %s", config_filename);
1620                 goto out;
1621         }
1622
1623         if (!(config_file = fopen(config_filename, "rb"))) {
1624                 /* no config file means nothing to rename, no error */
1625                 goto unlock_and_out;
1626         }
1627
1628         while (fgets(buf, sizeof(buf), config_file)) {
1629                 int i;
1630                 int length;
1631                 char *output = buf;
1632                 for (i = 0; buf[i] && isspace(buf[i]); i++)
1633                         ; /* do nothing */
1634                 if (buf[i] == '[') {
1635                         /* it's a section */
1636                         int offset = section_name_match(&buf[i], old_name);
1637                         if (offset > 0) {
1638                                 ret++;
1639                                 if (new_name == NULL) {
1640                                         remove = 1;
1641                                         continue;
1642                                 }
1643                                 store.baselen = strlen(new_name);
1644                                 if (!store_write_section(out_fd, new_name)) {
1645                                         ret = write_error(lock->filename);
1646                                         goto out;
1647                                 }
1648                                 /*
1649                                  * We wrote out the new section, with
1650                                  * a newline, now skip the old
1651                                  * section's length
1652                                  */
1653                                 output += offset + i;
1654                                 if (strlen(output) > 0) {
1655                                         /*
1656                                          * More content means there's
1657                                          * a declaration to put on the
1658                                          * next line; indent with a
1659                                          * tab
1660                                          */
1661                                         output -= 1;
1662                                         output[0] = '\t';
1663                                 }
1664                         }
1665                         remove = 0;
1666                 }
1667                 if (remove)
1668                         continue;
1669                 length = strlen(output);
1670                 if (write_in_full(out_fd, output, length) != length) {
1671                         ret = write_error(lock->filename);
1672                         goto out;
1673                 }
1674         }
1675         fclose(config_file);
1676 unlock_and_out:
1677         if (commit_lock_file(lock) < 0)
1678                 ret = error("could not commit config file %s", config_filename);
1679 out:
1680         free(filename_buf);
1681         return ret;
1682 }
1683
1684 int git_config_rename_section(const char *old_name, const char *new_name)
1685 {
1686         return git_config_rename_section_in_file(NULL, old_name, new_name);
1687 }
1688
1689 /*
1690  * Call this to report error for your variable that should not
1691  * get a boolean value (i.e. "[my] var" means "true").
1692  */
1693 #undef config_error_nonbool
1694 int config_error_nonbool(const char *var)
1695 {
1696         return error("Missing value for '%s'", var);
1697 }
1698
1699 int parse_config_key(const char *var,
1700                      const char *section,
1701                      const char **subsection, int *subsection_len,
1702                      const char **key)
1703 {
1704         int section_len = strlen(section);
1705         const char *dot;
1706
1707         /* Does it start with "section." ? */
1708         if (prefixcmp(var, section) || var[section_len] != '.')
1709                 return -1;
1710
1711         /*
1712          * Find the key; we don't know yet if we have a subsection, but we must
1713          * parse backwards from the end, since the subsection may have dots in
1714          * it, too.
1715          */
1716         dot = strrchr(var, '.');
1717         *key = dot + 1;
1718
1719         /* Did we have a subsection at all? */
1720         if (dot == var + section_len) {
1721                 *subsection = NULL;
1722                 *subsection_len = 0;
1723         }
1724         else {
1725                 *subsection = var + section_len + 1;
1726                 *subsection_len = dot - *subsection;
1727         }
1728
1729         return 0;
1730 }