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.autocrlf")) {
 679                 if (value && !strcasecmp(value, "input")) {
 680                         if (core_eol == EOL_CRLF)
 681                                 return error("core.autocrlf=input conflicts with core.eol=crlf");
 682                         auto_crlf = AUTO_CRLF_INPUT;
 683                         return 0;
 684                 }
 685                 auto_crlf = git_config_bool(var, value);
 686                 return 0;
 687         }
 688
 689         if (!strcmp(var, "core.safecrlf")) {
 690                 if (value && !strcasecmp(value, "warn")) {
 691                         safe_crlf = SAFE_CRLF_WARN;
 692                         return 0;
 693                 }
 694                 safe_crlf = git_config_bool(var, value);
 695                 return 0;
 696         }
 697
 698         if (!strcmp(var, "core.eol")) {
 699                 if (value && !strcasecmp(value, "lf"))
 700                         core_eol = EOL_LF;
 701                 else if (value && !strcasecmp(value, "crlf"))
 702                         core_eol = EOL_CRLF;
 703                 else if (value && !strcasecmp(value, "native"))
 704                         core_eol = EOL_NATIVE;
 705                 else
 706                         core_eol = EOL_UNSET;
 707                 if (core_eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 708                         return error("core.autocrlf=input conflicts with core.eol=crlf");
 709                 return 0;
 710         }
 711
 712         if (!strcmp(var, "core.notesref")) {
 713                 notes_ref_name = xstrdup(value);
 714                 return 0;
 715         }
 716
 717         if (!strcmp(var, "core.pager"))
 718                 return git_config_string(&pager_program, var, value);
 719
 720         if (!strcmp(var, "core.editor"))
 721                 return git_config_string(&editor_program, var, value);
 722
 723         if (!strcmp(var, "core.commentchar")) {
 724                 const char *comment;
 725                 int ret = git_config_string(&comment, var, value);
 726                 if (!ret)
 727                         comment_line_char = comment[0];
 728                 return ret;
 729         }
 730
 731         if (!strcmp(var, "core.askpass"))
 732                 return git_config_string(&askpass_program, var, value);
 733
 734         if (!strcmp(var, "core.excludesfile"))
 735                 return git_config_pathname(&excludes_file, var, value);
 736
 737         if (!strcmp(var, "core.whitespace")) {
 738                 if (!value)
 739                         return config_error_nonbool(var);
 740                 whitespace_rule_cfg = parse_whitespace_rule(value);
 741                 return 0;
 742         }
 743
 744         if (!strcmp(var, "core.fsyncobjectfiles")) {
 745                 fsync_object_files = git_config_bool(var, value);
 746                 return 0;
 747         }
 748
 749         if (!strcmp(var, "core.preloadindex")) {
 750                 core_preload_index = git_config_bool(var, value);
 751                 return 0;
 752         }
 753
 754         if (!strcmp(var, "core.createobject")) {
 755                 if (!strcmp(value, "rename"))
 756                         object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 757                 else if (!strcmp(value, "link"))
 758                         object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 759                 else
 760                         die("Invalid mode for object creation: %s", value);
 761                 return 0;
 762         }
 763
 764         if (!strcmp(var, "core.sparsecheckout")) {
 765                 core_apply_sparse_checkout = git_config_bool(var, value);
 766                 return 0;
 767         }
 768
 769         if (!strcmp(var, "core.precomposeunicode")) {
 770                 precomposed_unicode = git_config_bool(var, value);
 771                 return 0;
 772         }
 773
 774         /* Add other config variables here and to Documentation/config.txt. */
 775         return 0;
 776 }
 777
 778 static int git_default_i18n_config(const char *var, const char *value)
 779 {
 780         if (!strcmp(var, "i18n.commitencoding"))
 781                 return git_config_string(&git_commit_encoding, var, value);
 782
 783         if (!strcmp(var, "i18n.logoutputencoding"))
 784                 return git_config_string(&git_log_output_encoding, var, value);
 785
 786         /* Add other config variables here and to Documentation/config.txt. */
 787         return 0;
 788 }
 789
 790 static int git_default_branch_config(const char *var, const char *value)
 791 {
 792         if (!strcmp(var, "branch.autosetupmerge")) {
 793                 if (value && !strcasecmp(value, "always")) {
 794                         git_branch_track = BRANCH_TRACK_ALWAYS;
 795                         return 0;
 796                 }
 797                 git_branch_track = git_config_bool(var, value);
 798                 return 0;
 799         }
 800         if (!strcmp(var, "branch.autosetuprebase")) {
 801                 if (!value)
 802                         return config_error_nonbool(var);
 803                 else if (!strcmp(value, "never"))
 804                         autorebase = AUTOREBASE_NEVER;
 805                 else if (!strcmp(value, "local"))
 806                         autorebase = AUTOREBASE_LOCAL;
 807                 else if (!strcmp(value, "remote"))
 808                         autorebase = AUTOREBASE_REMOTE;
 809                 else if (!strcmp(value, "always"))
 810                         autorebase = AUTOREBASE_ALWAYS;
 811                 else
 812                         return error("Malformed value for %s", var);
 813                 return 0;
 814         }
 815
 816         /* Add other config variables here and to Documentation/config.txt. */
 817         return 0;
 818 }
 819
 820 static int git_default_push_config(const char *var, const char *value)
 821 {
 822         if (!strcmp(var, "push.default")) {
 823                 if (!value)
 824                         return config_error_nonbool(var);
 825                 else if (!strcmp(value, "nothing"))
 826                         push_default = PUSH_DEFAULT_NOTHING;
 827                 else if (!strcmp(value, "matching"))
 828                         push_default = PUSH_DEFAULT_MATCHING;
 829                 else if (!strcmp(value, "simple"))
 830                         push_default = PUSH_DEFAULT_SIMPLE;
 831                 else if (!strcmp(value, "upstream"))
 832                         push_default = PUSH_DEFAULT_UPSTREAM;
 833                 else if (!strcmp(value, "tracking")) /* deprecated */
 834                         push_default = PUSH_DEFAULT_UPSTREAM;
 835                 else if (!strcmp(value, "current"))
 836                         push_default = PUSH_DEFAULT_CURRENT;
 837                 else {
 838                         error("Malformed value for %s: %s", var, value);
 839                         return error("Must be one of nothing, matching, simple, "
 840                                      "upstream or current.");
 841                 }
 842                 return 0;
 843         }
 844
 845         /* Add other config variables here and to Documentation/config.txt. */
 846         return 0;
 847 }
 848
 849 static int git_default_mailmap_config(const char *var, const char *value)
 850 {
 851         if (!strcmp(var, "mailmap.file"))
 852                 return git_config_string(&git_mailmap_file, var, value);
 853         if (!strcmp(var, "mailmap.blob"))
 854                 return git_config_string(&git_mailmap_blob, var, value);
 855
 856         /* Add other config variables here and to Documentation/config.txt. */
 857         return 0;
 858 }
 859
 860 int git_default_config(const char *var, const char *value, void *dummy)
 861 {
 862         if (!prefixcmp(var, "core."))
 863                 return git_default_core_config(var, value);
 864
 865         if (!prefixcmp(var, "user."))
 866                 return git_ident_config(var, value, dummy);
 867
 868         if (!prefixcmp(var, "i18n."))
 869                 return git_default_i18n_config(var, value);
 870
 871         if (!prefixcmp(var, "branch."))
 872                 return git_default_branch_config(var, value);
 873
 874         if (!prefixcmp(var, "push."))
 875                 return git_default_push_config(var, value);
 876
 877         if (!prefixcmp(var, "mailmap."))
 878                 return git_default_mailmap_config(var, value);
 879
 880         if (!prefixcmp(var, "advice."))
 881                 return git_default_advice_config(var, value);
 882
 883         if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 884                 pager_use_color = git_config_bool(var,value);
 885                 return 0;
 886         }
 887
 888         if (!strcmp(var, "pack.packsizelimit")) {
 889                 pack_size_limit_cfg = git_config_ulong(var, value);
 890                 return 0;
 891         }
 892         /* Add other config variables here and to Documentation/config.txt. */
 893         return 0;
 894 }
 895
 896 int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 897 {
 898         int ret;
 899         FILE *f = fopen(filename, "r");
 900
 901         ret = -1;
 902         if (f) {
 903                 config_file top;
 904
 905                 /* push config-file parsing state stack */
 906                 top.prev = cf;
 907                 top.f = f;
 908                 top.name = filename;
 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                 fclose(f);
 923         }
 924         return ret;
 925 }
 926
 927 const char *git_etc_gitconfig(void)
 928 {
 929         static const char *system_wide;
 930         if (!system_wide)
 931                 system_wide = system_path(ETC_GITCONFIG);
 932         return system_wide;
 933 }
 934
 935 int git_env_bool(const char *k, int def)
 936 {
 937         const char *v = getenv(k);
 938         return v ? git_config_bool(k, v) : def;
 939 }
 940
 941 int git_config_system(void)
 942 {
 943         return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 944 }
 945
 946 int git_config_early(config_fn_t fn, void *data, const char *repo_config)
 947 {
 948         int ret = 0, found = 0;
 949         char *xdg_config = NULL;
 950         char *user_config = NULL;
 951
 952         home_config_paths(&user_config, &xdg_config, "config");
 953
 954         if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK)) {
 955                 ret += git_config_from_file(fn, git_etc_gitconfig(),
 956                                             data);
 957                 found += 1;
 958         }
 959
 960         if (xdg_config && !access_or_die(xdg_config, R_OK)) {
 961                 ret += git_config_from_file(fn, xdg_config, data);
 962                 found += 1;
 963         }
 964
 965         if (user_config && !access_or_die(user_config, R_OK)) {
 966                 ret += git_config_from_file(fn, user_config, data);
 967                 found += 1;
 968         }
 969
 970         if (repo_config && !access_or_die(repo_config, R_OK)) {
 971                 ret += git_config_from_file(fn, repo_config, data);
 972                 found += 1;
 973         }
 974
 975         switch (git_config_from_parameters(fn, data)) {
 976         case -1: /* error */
 977                 die("unable to parse command-line config");
 978                 break;
 979         case 0: /* found nothing */
 980                 break;
 981         default: /* found at least one item */
 982                 found++;
 983                 break;
 984         }
 985
 986         free(xdg_config);
 987         free(user_config);
 988         return ret == 0 ? found : ret;
 989 }
 990
 991 int git_config_with_options(config_fn_t fn, void *data,
 992                             const char *filename, int respect_includes)
 993 {
 994         char *repo_config = NULL;
 995         int ret;
 996         struct config_include_data inc = CONFIG_INCLUDE_INIT;
 997
 998         if (respect_includes) {
 999                 inc.fn = fn;
1000                 inc.data = data;
1001                 fn = git_config_include;
1002                 data = &inc;
1003         }
1004
1005         /*
1006          * If we have a specific filename, use it. Otherwise, follow the
1007          * regular lookup sequence.
1008          */
1009         if (filename)
1010                 return git_config_from_file(fn, filename, data);
1011
1012         repo_config = git_pathdup("config");
1013         ret = git_config_early(fn, data, repo_config);
1014         if (repo_config)
1015                 free(repo_config);
1016         return ret;
1017 }
1018
1019 int git_config(config_fn_t fn, void *data)
1020 {
1021         return git_config_with_options(fn, data, NULL, 1);
1022 }
1023
1024 /*
1025  * Find all the stuff for git_config_set() below.
1026  */
1027
1028 #define MAX_MATCHES 512
1029
1030 static struct {
1031         int baselen;
1032         char *key;
1033         int do_not_match;
1034         regex_t *value_regex;
1035         int multi_replace;
1036         size_t offset[MAX_MATCHES];
1037         enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
1038         int seen;
1039 } store;
1040
1041 static int matches(const char *key, const char *value)
1042 {
1043         return !strcmp(key, store.key) &&
1044                 (store.value_regex == NULL ||
1045                  (store.do_not_match ^
1046                   !regexec(store.value_regex, value, 0, NULL, 0)));
1047 }
1048
1049 static int store_aux(const char *key, const char *value, void *cb)
1050 {
1051         const char *ep;
1052         size_t section_len;
1053         FILE *f = cf->f;
1054
1055         switch (store.state) {
1056         case KEY_SEEN:
1057                 if (matches(key, value)) {
1058                         if (store.seen == 1 && store.multi_replace == 0) {
1059                                 warning("%s has multiple values", key);
1060                         } else if (store.seen >= MAX_MATCHES) {
1061                                 error("too many matches for %s", key);
1062                                 return 1;
1063                         }
1064
1065                         store.offset[store.seen] = ftell(f);
1066                         store.seen++;
1067                 }
1068                 break;
1069         case SECTION_SEEN:
1070                 /*
1071                  * What we are looking for is in store.key (both
1072                  * section and var), and its section part is baselen
1073                  * long.  We found key (again, both section and var).
1074                  * We would want to know if this key is in the same
1075                  * section as what we are looking for.  We already
1076                  * know we are in the same section as what should
1077                  * hold store.key.
1078                  */
1079                 ep = strrchr(key, '.');
1080                 section_len = ep - key;
1081
1082                 if ((section_len != store.baselen) ||
1083                     memcmp(key, store.key, section_len+1)) {
1084                         store.state = SECTION_END_SEEN;
1085                         break;
1086                 }
1087
1088                 /*
1089                  * Do not increment matches: this is no match, but we
1090                  * just made sure we are in the desired section.
1091                  */
1092                 store.offset[store.seen] = ftell(f);
1093                 /* fallthru */
1094         case SECTION_END_SEEN:
1095         case START:
1096                 if (matches(key, value)) {
1097                         store.offset[store.seen] = ftell(f);
1098                         store.state = KEY_SEEN;
1099                         store.seen++;
1100                 } else {
1101                         if (strrchr(key, '.') - key == store.baselen &&
1102                               !strncmp(key, store.key, store.baselen)) {
1103                                         store.state = SECTION_SEEN;
1104                                         store.offset[store.seen] = ftell(f);
1105                         }
1106                 }
1107         }
1108         return 0;
1109 }
1110
1111 static int write_error(const char *filename)
1112 {
1113         error("failed to write new configuration file %s", filename);
1114
1115         /* Same error code as "failed to rename". */
1116         return 4;
1117 }
1118
1119 static int store_write_section(int fd, const char *key)
1120 {
1121         const char *dot;
1122         int i, success;
1123         struct strbuf sb = STRBUF_INIT;
1124
1125         dot = memchr(key, '.', store.baselen);
1126         if (dot) {
1127                 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1128                 for (i = dot - key + 1; i < store.baselen; i++) {
1129                         if (key[i] == '"' || key[i] == '\\')
1130                                 strbuf_addch(&sb, '\\');
1131                         strbuf_addch(&sb, key[i]);
1132                 }
1133                 strbuf_addstr(&sb, "\"]\n");
1134         } else {
1135                 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1136         }
1137
1138         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1139         strbuf_release(&sb);
1140
1141         return success;
1142 }
1143
1144 static int store_write_pair(int fd, const char *key, const char *value)
1145 {
1146         int i, success;
1147         int length = strlen(key + store.baselen + 1);
1148         const char *quote = "";
1149         struct strbuf sb = STRBUF_INIT;
1150
1151         /*
1152          * Check to see if the value needs to be surrounded with a dq pair.
1153          * Note that problematic characters are always backslash-quoted; this
1154          * check is about not losing leading or trailing SP and strings that
1155          * follow beginning-of-comment characters (i.e. ';' and '#') by the
1156          * configuration parser.
1157          */
1158         if (value[0] == ' ')
1159                 quote = "\"";
1160         for (i = 0; value[i]; i++)
1161                 if (value[i] == ';' || value[i] == '#')
1162                         quote = "\"";
1163         if (i && value[i - 1] == ' ')
1164                 quote = "\"";
1165
1166         strbuf_addf(&sb, "\t%.*s = %s",
1167                     length, key + store.baselen + 1, quote);
1168
1169         for (i = 0; value[i]; i++)
1170                 switch (value[i]) {
1171                 case '\n':
1172                         strbuf_addstr(&sb, "\\n");
1173                         break;
1174                 case '\t':
1175                         strbuf_addstr(&sb, "\\t");
1176                         break;
1177                 case '"':
1178                 case '\\':
1179                         strbuf_addch(&sb, '\\');
1180                 default:
1181                         strbuf_addch(&sb, value[i]);
1182                         break;
1183                 }
1184         strbuf_addf(&sb, "%s\n", quote);
1185
1186         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1187         strbuf_release(&sb);
1188
1189         return success;
1190 }
1191
1192 static ssize_t find_beginning_of_line(const char *contents, size_t size,
1193         size_t offset_, int *found_bracket)
1194 {
1195         size_t equal_offset = size, bracket_offset = size;
1196         ssize_t offset;
1197
1198 contline:
1199         for (offset = offset_-2; offset > 0
1200                         && contents[offset] != '\n'; offset--)
1201                 switch (contents[offset]) {
1202                         case '=': equal_offset = offset; break;
1203                         case ']': bracket_offset = offset; break;
1204                 }
1205         if (offset > 0 && contents[offset-1] == '\\') {
1206                 offset_ = offset;
1207                 goto contline;
1208         }
1209         if (bracket_offset < equal_offset) {
1210                 *found_bracket = 1;
1211                 offset = bracket_offset+1;
1212         } else
1213                 offset++;
1214
1215         return offset;
1216 }
1217
1218 int git_config_set_in_file(const char *config_filename,
1219                         const char *key, const char *value)
1220 {
1221         return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1222 }
1223
1224 int git_config_set(const char *key, const char *value)
1225 {
1226         return git_config_set_multivar(key, value, NULL, 0);
1227 }
1228
1229 /*
1230  * Auxiliary function to sanity-check and split the key into the section
1231  * identifier and variable name.
1232  *
1233  * Returns 0 on success, -1 when there is an invalid character in the key and
1234  * -2 if there is no section name in the key.
1235  *
1236  * store_key - pointer to char* which will hold a copy of the key with
1237  *             lowercase section and variable name
1238  * baselen - pointer to int which will hold the length of the
1239  *           section + subsection part, can be NULL
1240  */
1241 int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1242 {
1243         int i, dot, baselen;
1244         const char *last_dot = strrchr(key, '.');
1245
1246         /*
1247          * Since "key" actually contains the section name and the real
1248          * key name separated by a dot, we have to know where the dot is.
1249          */
1250
1251         if (last_dot == NULL || last_dot == key) {
1252                 error("key does not contain a section: %s", key);
1253                 return -CONFIG_NO_SECTION_OR_NAME;
1254         }
1255
1256         if (!last_dot[1]) {
1257                 error("key does not contain variable name: %s", key);
1258                 return -CONFIG_NO_SECTION_OR_NAME;
1259         }
1260
1261         baselen = last_dot - key;
1262         if (baselen_)
1263                 *baselen_ = baselen;
1264
1265         /*
1266          * Validate the key and while at it, lower case it for matching.
1267          */
1268         *store_key = xmalloc(strlen(key) + 1);
1269
1270         dot = 0;
1271         for (i = 0; key[i]; i++) {
1272                 unsigned char c = key[i];
1273                 if (c == '.')
1274                         dot = 1;
1275                 /* Leave the extended basename untouched.. */
1276                 if (!dot || i > baselen) {
1277                         if (!iskeychar(c) ||
1278                             (i == baselen + 1 && !isalpha(c))) {
1279                                 error("invalid key: %s", key);
1280                                 goto out_free_ret_1;
1281                         }
1282                         c = tolower(c);
1283                 } else if (c == '\n') {
1284                         error("invalid key (newline): %s", key);
1285                         goto out_free_ret_1;
1286                 }
1287                 (*store_key)[i] = c;
1288         }
1289         (*store_key)[i] = 0;
1290
1291         return 0;
1292
1293 out_free_ret_1:
1294         free(*store_key);
1295         *store_key = NULL;
1296         return -CONFIG_INVALID_KEY;
1297 }
1298
1299 /*
1300  * If value==NULL, unset in (remove from) config,
1301  * if value_regex!=NULL, disregard key/value pairs where value does not match.
1302  * if multi_replace==0, nothing, or only one matching key/value is replaced,
1303  *     else all matching key/values (regardless how many) are removed,
1304  *     before the new pair is written.
1305  *
1306  * Returns 0 on success.
1307  *
1308  * This function does this:
1309  *
1310  * - it locks the config file by creating ".git/config.lock"
1311  *
1312  * - it then parses the config using store_aux() as validator to find
1313  *   the position on the key/value pair to replace. If it is to be unset,
1314  *   it must be found exactly once.
1315  *
1316  * - the config file is mmap()ed and the part before the match (if any) is
1317  *   written to the lock file, then the changed part and the rest.
1318  *
1319  * - the config file is removed and the lock file rename()d to it.
1320  *
1321  */
1322 int git_config_set_multivar_in_file(const char *config_filename,
1323                                 const char *key, const char *value,
1324                                 const char *value_regex, int multi_replace)
1325 {
1326         int fd = -1, in_fd;
1327         int ret;
1328         struct lock_file *lock = NULL;
1329         char *filename_buf = NULL;
1330
1331         /* parse-key returns negative; flip the sign to feed exit(3) */
1332         ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1333         if (ret)
1334                 goto out_free;
1335
1336         store.multi_replace = multi_replace;
1337
1338         if (!config_filename)
1339                 config_filename = filename_buf = git_pathdup("config");
1340
1341         /*
1342          * The lock serves a purpose in addition to locking: the new
1343          * contents of .git/config will be written into it.
1344          */
1345         lock = xcalloc(sizeof(struct lock_file), 1);
1346         fd = hold_lock_file_for_update(lock, config_filename, 0);
1347         if (fd < 0) {
1348                 error("could not lock config file %s: %s", config_filename, strerror(errno));
1349                 free(store.key);
1350                 ret = CONFIG_NO_LOCK;
1351                 goto out_free;
1352         }
1353
1354         /*
1355          * If .git/config does not exist yet, write a minimal version.
1356          */
1357         in_fd = open(config_filename, O_RDONLY);
1358         if ( in_fd < 0 ) {
1359                 free(store.key);
1360
1361                 if ( ENOENT != errno ) {
1362                         error("opening %s: %s", config_filename,
1363                               strerror(errno));
1364                         ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1365                         goto out_free;
1366                 }
1367                 /* if nothing to unset, error out */
1368                 if (value == NULL) {
1369                         ret = CONFIG_NOTHING_SET;
1370                         goto out_free;
1371                 }
1372
1373                 store.key = (char *)key;
1374                 if (!store_write_section(fd, key) ||
1375                     !store_write_pair(fd, key, value))
1376                         goto write_err_out;
1377         } else {
1378                 struct stat st;
1379                 char *contents;
1380                 size_t contents_sz, copy_begin, copy_end;
1381                 int i, new_line = 0;
1382
1383                 if (value_regex == NULL)
1384                         store.value_regex = NULL;
1385                 else {
1386                         if (value_regex[0] == '!') {
1387                                 store.do_not_match = 1;
1388                                 value_regex++;
1389                         } else
1390                                 store.do_not_match = 0;
1391
1392                         store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1393                         if (regcomp(store.value_regex, value_regex,
1394                                         REG_EXTENDED)) {
1395                                 error("invalid pattern: %s", value_regex);
1396                                 free(store.value_regex);
1397                                 ret = CONFIG_INVALID_PATTERN;
1398                                 goto out_free;
1399                         }
1400                 }
1401
1402                 store.offset[0] = 0;
1403                 store.state = START;
1404                 store.seen = 0;
1405
1406                 /*
1407                  * After this, store.offset will contain the *end* offset
1408                  * of the last match, or remain at 0 if no match was found.
1409                  * As a side effect, we make sure to transform only a valid
1410                  * existing config file.
1411                  */
1412                 if (git_config_from_file(store_aux, config_filename, NULL)) {
1413                         error("invalid config file %s", config_filename);
1414                         free(store.key);
1415                         if (store.value_regex != NULL) {
1416                                 regfree(store.value_regex);
1417                                 free(store.value_regex);
1418                         }
1419                         ret = CONFIG_INVALID_FILE;
1420                         goto out_free;
1421                 }
1422
1423                 free(store.key);
1424                 if (store.value_regex != NULL) {
1425                         regfree(store.value_regex);
1426                         free(store.value_regex);
1427                 }
1428
1429                 /* if nothing to unset, or too many matches, error out */
1430                 if ((store.seen == 0 && value == NULL) ||
1431                                 (store.seen > 1 && multi_replace == 0)) {
1432                         ret = CONFIG_NOTHING_SET;
1433                         goto out_free;
1434                 }
1435
1436                 fstat(in_fd, &st);
1437                 contents_sz = xsize_t(st.st_size);
1438                 contents = xmmap(NULL, contents_sz, PROT_READ,
1439                         MAP_PRIVATE, in_fd, 0);
1440                 close(in_fd);
1441
1442                 if (store.seen == 0)
1443                         store.seen = 1;
1444
1445                 for (i = 0, copy_begin = 0; i < store.seen; i++) {
1446                         if (store.offset[i] == 0) {
1447                                 store.offset[i] = copy_end = contents_sz;
1448                         } else if (store.state != KEY_SEEN) {
1449                                 copy_end = store.offset[i];
1450                         } else
1451                                 copy_end = find_beginning_of_line(
1452                                         contents, contents_sz,
1453                                         store.offset[i]-2, &new_line);
1454
1455                         if (copy_end > 0 && contents[copy_end-1] != '\n')
1456                                 new_line = 1;
1457
1458                         /* write the first part of the config */
1459                         if (copy_end > copy_begin) {
1460                                 if (write_in_full(fd, contents + copy_begin,
1461                                                   copy_end - copy_begin) <
1462                                     copy_end - copy_begin)
1463                                         goto write_err_out;
1464                                 if (new_line &&
1465                                     write_str_in_full(fd, "\n") != 1)
1466                                         goto write_err_out;
1467                         }
1468                         copy_begin = store.offset[i];
1469                 }
1470
1471                 /* write the pair (value == NULL means unset) */
1472                 if (value != NULL) {
1473                         if (store.state == START) {
1474                                 if (!store_write_section(fd, key))
1475                                         goto write_err_out;
1476                         }
1477                         if (!store_write_pair(fd, key, value))
1478                                 goto write_err_out;
1479                 }
1480
1481                 /* write the rest of the config */
1482                 if (copy_begin < contents_sz)
1483                         if (write_in_full(fd, contents + copy_begin,
1484                                           contents_sz - copy_begin) <
1485                             contents_sz - copy_begin)
1486                                 goto write_err_out;
1487
1488                 munmap(contents, contents_sz);
1489         }
1490
1491         if (commit_lock_file(lock) < 0) {
1492                 error("could not commit config file %s", config_filename);
1493                 ret = CONFIG_NO_WRITE;
1494                 goto out_free;
1495         }
1496
1497         /*
1498          * lock is committed, so don't try to roll it back below.
1499          * NOTE: Since lockfile.c keeps a linked list of all created
1500          * lock_file structures, it isn't safe to free(lock).  It's
1501          * better to just leave it hanging around.
1502          */
1503         lock = NULL;
1504         ret = 0;
1505
1506 out_free:
1507         if (lock)
1508                 rollback_lock_file(lock);
1509         free(filename_buf);
1510         return ret;
1511
1512 write_err_out:
1513         ret = write_error(lock->filename);
1514         goto out_free;
1515
1516 }
1517
1518 int git_config_set_multivar(const char *key, const char *value,
1519                         const char *value_regex, int multi_replace)
1520 {
1521         return git_config_set_multivar_in_file(NULL, key, value, value_regex,
1522                                                multi_replace);
1523 }
1524
1525 static int section_name_match (const char *buf, const char *name)
1526 {
1527         int i = 0, j = 0, dot = 0;
1528         if (buf[i] != '[')
1529                 return 0;
1530         for (i = 1; buf[i] && buf[i] != ']'; i++) {
1531                 if (!dot && isspace(buf[i])) {
1532                         dot = 1;
1533                         if (name[j++] != '.')
1534                                 break;
1535                         for (i++; isspace(buf[i]); i++)
1536                                 ; /* do nothing */
1537                         if (buf[i] != '"')
1538                                 break;
1539                         continue;
1540                 }
1541                 if (buf[i] == '\\' && dot)
1542                         i++;
1543                 else if (buf[i] == '"' && dot) {
1544                         for (i++; isspace(buf[i]); i++)
1545                                 ; /* do_nothing */
1546                         break;
1547                 }
1548                 if (buf[i] != name[j++])
1549                         break;
1550         }
1551         if (buf[i] == ']' && name[j] == 0) {
1552                 /*
1553                  * We match, now just find the right length offset by
1554                  * gobbling up any whitespace after it, as well
1555                  */
1556                 i++;
1557                 for (; buf[i] && isspace(buf[i]); i++)
1558                         ; /* do nothing */
1559                 return i;
1560         }
1561         return 0;
1562 }
1563
1564 static int section_name_is_ok(const char *name)
1565 {
1566         /* Empty section names are bogus. */
1567         if (!*name)
1568                 return 0;
1569
1570         /*
1571          * Before a dot, we must be alphanumeric or dash. After the first dot,
1572          * anything goes, so we can stop checking.
1573          */
1574         for (; *name && *name != '.'; name++)
1575                 if (*name != '-' && !isalnum(*name))
1576                         return 0;
1577         return 1;
1578 }
1579
1580 /* if new_name == NULL, the section is removed instead */
1581 int git_config_rename_section_in_file(const char *config_filename,
1582                                       const char *old_name, const char *new_name)
1583 {
1584         int ret = 0, remove = 0;
1585         char *filename_buf = NULL;
1586         struct lock_file *lock;
1587         int out_fd;
1588         char buf[1024];
1589         FILE *config_file;
1590
1591         if (new_name && !section_name_is_ok(new_name)) {
1592                 ret = error("invalid section name: %s", new_name);
1593                 goto out;
1594         }
1595
1596         if (!config_filename)
1597                 config_filename = filename_buf = git_pathdup("config");
1598
1599         lock = xcalloc(sizeof(struct lock_file), 1);
1600         out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1601         if (out_fd < 0) {
1602                 ret = error("could not lock config file %s", config_filename);
1603                 goto out;
1604         }
1605
1606         if (!(config_file = fopen(config_filename, "rb"))) {
1607                 /* no config file means nothing to rename, no error */
1608                 goto unlock_and_out;
1609         }
1610
1611         while (fgets(buf, sizeof(buf), config_file)) {
1612                 int i;
1613                 int length;
1614                 char *output = buf;
1615                 for (i = 0; buf[i] && isspace(buf[i]); i++)
1616                         ; /* do nothing */
1617                 if (buf[i] == '[') {
1618                         /* it's a section */
1619                         int offset = section_name_match(&buf[i], old_name);
1620                         if (offset > 0) {
1621                                 ret++;
1622                                 if (new_name == NULL) {
1623                                         remove = 1;
1624                                         continue;
1625                                 }
1626                                 store.baselen = strlen(new_name);
1627                                 if (!store_write_section(out_fd, new_name)) {
1628                                         ret = write_error(lock->filename);
1629                                         goto out;
1630                                 }
1631                                 /*
1632                                  * We wrote out the new section, with
1633                                  * a newline, now skip the old
1634                                  * section's length
1635                                  */
1636                                 output += offset + i;
1637                                 if (strlen(output) > 0) {
1638                                         /*
1639                                          * More content means there's
1640                                          * a declaration to put on the
1641                                          * next line; indent with a
1642                                          * tab
1643                                          */
1644                                         output -= 1;
1645                                         output[0] = '\t';
1646                                 }
1647                         }
1648                         remove = 0;
1649                 }
1650                 if (remove)
1651                         continue;
1652                 length = strlen(output);
1653                 if (write_in_full(out_fd, output, length) != length) {
1654                         ret = write_error(lock->filename);
1655                         goto out;
1656                 }
1657         }
1658         fclose(config_file);
1659 unlock_and_out:
1660         if (commit_lock_file(lock) < 0)
1661                 ret = error("could not commit config file %s", config_filename);
1662 out:
1663         free(filename_buf);
1664         return ret;
1665 }
1666
1667 int git_config_rename_section(const char *old_name, const char *new_name)
1668 {
1669         return git_config_rename_section_in_file(NULL, old_name, new_name);
1670 }
1671
1672 /*
1673  * Call this to report error for your variable that should not
1674  * get a boolean value (i.e. "[my] var" means "true").
1675  */
1676 #undef config_error_nonbool
1677 int config_error_nonbool(const char *var)
1678 {
1679         return error("Missing value for '%s'", var);
1680 }
1681
1682 int parse_config_key(const char *var,
1683                      const char *section,
1684                      const char **subsection, int *subsection_len,
1685                      const char **key)
1686 {
1687         int section_len = strlen(section);
1688         const char *dot;
1689
1690         /* Does it start with "section." ? */
1691         if (prefixcmp(var, section) || var[section_len] != '.')
1692                 return -1;
1693
1694         /*
1695          * Find the key; we don't know yet if we have a subsection, but we must
1696          * parse backwards from the end, since the subsection may have dots in
1697          * it, too.
1698          */
1699         dot = strrchr(var, '.');
1700         *key = dot + 1;
1701
1702         /* Did we have a subsection at all? */
1703         if (dot == var + section_len) {
1704                 *subsection = NULL;
1705                 *subsection_len = 0;
1706         }
1707         else {
1708                 *subsection = var + section_len + 1;
1709                 *subsection_len = dot - *subsection;
1710         }
1711
1712         return 0;
1713 }