Andrew's git / gitweb.git / config.c
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config.con commit Merge branch 'jc/merge-blobs' (9591fcc)
   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
  13typedef 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
  23static config_file *cf;
  24
  25static int zlib_compression_seen;
  26
  27#define MAX_INCLUDE_DEPTH 10
  28static 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?";
  34static 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
  73int 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
  96static void lowercase(char *p)
  97{
  98        for (; *p; p++)
  99                *p = tolower(*p);
 100}
 101
 102void 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
 115int 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
 138int 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
 169static 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
 195static 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
 256static inline int iskeychar(int c)
 257{
 258        return isalnum(c) || c == '-';
 259}
 260
 261static 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
 290static 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;
 321error_incomplete_line:
 322        cf->linenr--;
 323        return -1;
 324}
 325
 326static 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
 342static 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
 405static 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
 424static 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
 450int 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
 473static 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
 480int 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
 488unsigned 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
 496static 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
 513int 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
 523int 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
 534int 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
 540int 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
 548int 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
 558static 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
 570        if (!strcmp(var, "core.quotepath")) {
 571                quote_path_fully = git_config_bool(var, value);
 572                return 0;
 573        }
 574
 575        if (!strcmp(var, "core.symlinks")) {
 576                has_symlinks = git_config_bool(var, value);
 577                return 0;
 578        }
 579
 580        if (!strcmp(var, "core.ignorecase")) {
 581                ignore_case = git_config_bool(var, value);
 582                return 0;
 583        }
 584
 585        if (!strcmp(var, "core.attributesfile"))
 586                return git_config_pathname(&git_attributes_file, var, value);
 587
 588        if (!strcmp(var, "core.bare")) {
 589                is_bare_repository_cfg = git_config_bool(var, value);
 590                return 0;
 591        }
 592
 593        if (!strcmp(var, "core.ignorestat")) {
 594                assume_unchanged = git_config_bool(var, value);
 595                return 0;
 596        }
 597
 598        if (!strcmp(var, "core.prefersymlinkrefs")) {
 599                prefer_symlink_refs = git_config_bool(var, value);
 600                return 0;
 601        }
 602
 603        if (!strcmp(var, "core.logallrefupdates")) {
 604                log_all_ref_updates = git_config_bool(var, value);
 605                return 0;
 606        }
 607
 608        if (!strcmp(var, "core.warnambiguousrefs")) {
 609                warn_ambiguous_refs = git_config_bool(var, value);
 610                return 0;
 611        }
 612
 613        if (!strcmp(var, "core.abbrev")) {
 614                int abbrev = git_config_int(var, value);
 615                if (abbrev < minimum_abbrev || abbrev > 40)
 616                        return -1;
 617                default_abbrev = abbrev;
 618                return 0;
 619        }
 620
 621        if (!strcmp(var, "core.loosecompression")) {
 622                int level = git_config_int(var, value);
 623                if (level == -1)
 624                        level = Z_DEFAULT_COMPRESSION;
 625                else if (level < 0 || level > Z_BEST_COMPRESSION)
 626                        die("bad zlib compression level %d", level);
 627                zlib_compression_level = level;
 628                zlib_compression_seen = 1;
 629                return 0;
 630        }
 631
 632        if (!strcmp(var, "core.compression")) {
 633                int level = git_config_int(var, value);
 634                if (level == -1)
 635                        level = Z_DEFAULT_COMPRESSION;
 636                else if (level < 0 || level > Z_BEST_COMPRESSION)
 637                        die("bad zlib compression level %d", level);
 638                core_compression_level = level;
 639                core_compression_seen = 1;
 640                if (!zlib_compression_seen)
 641                        zlib_compression_level = level;
 642                return 0;
 643        }
 644
 645        if (!strcmp(var, "core.packedgitwindowsize")) {
 646                int pgsz_x2 = getpagesize() * 2;
 647                packed_git_window_size = git_config_ulong(var, value);
 648
 649                /* This value must be multiple of (pagesize * 2) */
 650                packed_git_window_size /= pgsz_x2;
 651                if (packed_git_window_size < 1)
 652                        packed_git_window_size = 1;
 653                packed_git_window_size *= pgsz_x2;
 654                return 0;
 655        }
 656
 657        if (!strcmp(var, "core.bigfilethreshold")) {
 658                big_file_threshold = git_config_ulong(var, value);
 659                return 0;
 660        }
 661
 662        if (!strcmp(var, "core.packedgitlimit")) {
 663                packed_git_limit = git_config_ulong(var, value);
 664                return 0;
 665        }
 666
 667        if (!strcmp(var, "core.deltabasecachelimit")) {
 668                delta_base_cache_limit = git_config_ulong(var, value);
 669                return 0;
 670        }
 671
 672        if (!strcmp(var, "core.logpackaccess"))
 673                return git_config_string(&log_pack_access, var, value);
 674
 675        if (!strcmp(var, "core.autocrlf")) {
 676                if (value && !strcasecmp(value, "input")) {
 677                        if (core_eol == EOL_CRLF)
 678                                return error("core.autocrlf=input conflicts with core.eol=crlf");
 679                        auto_crlf = AUTO_CRLF_INPUT;
 680                        return 0;
 681                }
 682                auto_crlf = git_config_bool(var, value);
 683                return 0;
 684        }
 685
 686        if (!strcmp(var, "core.safecrlf")) {
 687                if (value && !strcasecmp(value, "warn")) {
 688                        safe_crlf = SAFE_CRLF_WARN;
 689                        return 0;
 690                }
 691                safe_crlf = git_config_bool(var, value);
 692                return 0;
 693        }
 694
 695        if (!strcmp(var, "core.eol")) {
 696                if (value && !strcasecmp(value, "lf"))
 697                        core_eol = EOL_LF;
 698                else if (value && !strcasecmp(value, "crlf"))
 699                        core_eol = EOL_CRLF;
 700                else if (value && !strcasecmp(value, "native"))
 701                        core_eol = EOL_NATIVE;
 702                else
 703                        core_eol = EOL_UNSET;
 704                if (core_eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 705                        return error("core.autocrlf=input conflicts with core.eol=crlf");
 706                return 0;
 707        }
 708
 709        if (!strcmp(var, "core.notesref")) {
 710                notes_ref_name = xstrdup(value);
 711                return 0;
 712        }
 713
 714        if (!strcmp(var, "core.pager"))
 715                return git_config_string(&pager_program, var, value);
 716
 717        if (!strcmp(var, "core.editor"))
 718                return git_config_string(&editor_program, var, value);
 719
 720        if (!strcmp(var, "core.askpass"))
 721                return git_config_string(&askpass_program, var, value);
 722
 723        if (!strcmp(var, "core.excludesfile"))
 724                return git_config_pathname(&excludes_file, var, value);
 725
 726        if (!strcmp(var, "core.whitespace")) {
 727                if (!value)
 728                        return config_error_nonbool(var);
 729                whitespace_rule_cfg = parse_whitespace_rule(value);
 730                return 0;
 731        }
 732
 733        if (!strcmp(var, "core.fsyncobjectfiles")) {
 734                fsync_object_files = git_config_bool(var, value);
 735                return 0;
 736        }
 737
 738        if (!strcmp(var, "core.preloadindex")) {
 739                core_preload_index = git_config_bool(var, value);
 740                return 0;
 741        }
 742
 743        if (!strcmp(var, "core.createobject")) {
 744                if (!strcmp(value, "rename"))
 745                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 746                else if (!strcmp(value, "link"))
 747                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 748                else
 749                        die("Invalid mode for object creation: %s", value);
 750                return 0;
 751        }
 752
 753        if (!strcmp(var, "core.sparsecheckout")) {
 754                core_apply_sparse_checkout = git_config_bool(var, value);
 755                return 0;
 756        }
 757
 758        if (!strcmp(var, "core.precomposeunicode")) {
 759                precomposed_unicode = git_config_bool(var, value);
 760                return 0;
 761        }
 762
 763        /* Add other config variables here and to Documentation/config.txt. */
 764        return 0;
 765}
 766
 767static int git_default_i18n_config(const char *var, const char *value)
 768{
 769        if (!strcmp(var, "i18n.commitencoding"))
 770                return git_config_string(&git_commit_encoding, var, value);
 771
 772        if (!strcmp(var, "i18n.logoutputencoding"))
 773                return git_config_string(&git_log_output_encoding, var, value);
 774
 775        /* Add other config variables here and to Documentation/config.txt. */
 776        return 0;
 777}
 778
 779static int git_default_branch_config(const char *var, const char *value)
 780{
 781        if (!strcmp(var, "branch.autosetupmerge")) {
 782                if (value && !strcasecmp(value, "always")) {
 783                        git_branch_track = BRANCH_TRACK_ALWAYS;
 784                        return 0;
 785                }
 786                git_branch_track = git_config_bool(var, value);
 787                return 0;
 788        }
 789        if (!strcmp(var, "branch.autosetuprebase")) {
 790                if (!value)
 791                        return config_error_nonbool(var);
 792                else if (!strcmp(value, "never"))
 793                        autorebase = AUTOREBASE_NEVER;
 794                else if (!strcmp(value, "local"))
 795                        autorebase = AUTOREBASE_LOCAL;
 796                else if (!strcmp(value, "remote"))
 797                        autorebase = AUTOREBASE_REMOTE;
 798                else if (!strcmp(value, "always"))
 799                        autorebase = AUTOREBASE_ALWAYS;
 800                else
 801                        return error("Malformed value for %s", var);
 802                return 0;
 803        }
 804
 805        /* Add other config variables here and to Documentation/config.txt. */
 806        return 0;
 807}
 808
 809static int git_default_push_config(const char *var, const char *value)
 810{
 811        if (!strcmp(var, "push.default")) {
 812                if (!value)
 813                        return config_error_nonbool(var);
 814                else if (!strcmp(value, "nothing"))
 815                        push_default = PUSH_DEFAULT_NOTHING;
 816                else if (!strcmp(value, "matching"))
 817                        push_default = PUSH_DEFAULT_MATCHING;
 818                else if (!strcmp(value, "simple"))
 819                        push_default = PUSH_DEFAULT_SIMPLE;
 820                else if (!strcmp(value, "upstream"))
 821                        push_default = PUSH_DEFAULT_UPSTREAM;
 822                else if (!strcmp(value, "tracking")) /* deprecated */
 823                        push_default = PUSH_DEFAULT_UPSTREAM;
 824                else if (!strcmp(value, "current"))
 825                        push_default = PUSH_DEFAULT_CURRENT;
 826                else {
 827                        error("Malformed value for %s: %s", var, value);
 828                        return error("Must be one of nothing, matching, simple, "
 829                                     "upstream or current.");
 830                }
 831                return 0;
 832        }
 833
 834        /* Add other config variables here and to Documentation/config.txt. */
 835        return 0;
 836}
 837
 838static int git_default_mailmap_config(const char *var, const char *value)
 839{
 840        if (!strcmp(var, "mailmap.file"))
 841                return git_config_string(&git_mailmap_file, var, value);
 842        if (!strcmp(var, "mailmap.blob"))
 843                return git_config_string(&git_mailmap_blob, var, value);
 844
 845        /* Add other config variables here and to Documentation/config.txt. */
 846        return 0;
 847}
 848
 849int git_default_config(const char *var, const char *value, void *dummy)
 850{
 851        if (!prefixcmp(var, "core."))
 852                return git_default_core_config(var, value);
 853
 854        if (!prefixcmp(var, "user."))
 855                return git_ident_config(var, value, dummy);
 856
 857        if (!prefixcmp(var, "i18n."))
 858                return git_default_i18n_config(var, value);
 859
 860        if (!prefixcmp(var, "branch."))
 861                return git_default_branch_config(var, value);
 862
 863        if (!prefixcmp(var, "push."))
 864                return git_default_push_config(var, value);
 865
 866        if (!prefixcmp(var, "mailmap."))
 867                return git_default_mailmap_config(var, value);
 868
 869        if (!prefixcmp(var, "advice."))
 870                return git_default_advice_config(var, value);
 871
 872        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 873                pager_use_color = git_config_bool(var,value);
 874                return 0;
 875        }
 876
 877        if (!strcmp(var, "pack.packsizelimit")) {
 878                pack_size_limit_cfg = git_config_ulong(var, value);
 879                return 0;
 880        }
 881        /* Add other config variables here and to Documentation/config.txt. */
 882        return 0;
 883}
 884
 885int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 886{
 887        int ret;
 888        FILE *f = fopen(filename, "r");
 889
 890        ret = -1;
 891        if (f) {
 892                config_file top;
 893
 894                /* push config-file parsing state stack */
 895                top.prev = cf;
 896                top.f = f;
 897                top.name = filename;
 898                top.linenr = 1;
 899                top.eof = 0;
 900                strbuf_init(&top.value, 1024);
 901                strbuf_init(&top.var, 1024);
 902                cf = &top;
 903
 904                ret = git_parse_file(fn, data);
 905
 906                /* pop config-file parsing state stack */
 907                strbuf_release(&top.value);
 908                strbuf_release(&top.var);
 909                cf = top.prev;
 910
 911                fclose(f);
 912        }
 913        return ret;
 914}
 915
 916const char *git_etc_gitconfig(void)
 917{
 918        static const char *system_wide;
 919        if (!system_wide)
 920                system_wide = system_path(ETC_GITCONFIG);
 921        return system_wide;
 922}
 923
 924int git_env_bool(const char *k, int def)
 925{
 926        const char *v = getenv(k);
 927        return v ? git_config_bool(k, v) : def;
 928}
 929
 930int git_config_system(void)
 931{
 932        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 933}
 934
 935int git_config_early(config_fn_t fn, void *data, const char *repo_config)
 936{
 937        int ret = 0, found = 0;
 938        char *xdg_config = NULL;
 939        char *user_config = NULL;
 940
 941        home_config_paths(&user_config, &xdg_config, "config");
 942
 943        if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK)) {
 944                ret += git_config_from_file(fn, git_etc_gitconfig(),
 945                                            data);
 946                found += 1;
 947        }
 948
 949        if (xdg_config && !access_or_die(xdg_config, R_OK)) {
 950                ret += git_config_from_file(fn, xdg_config, data);
 951                found += 1;
 952        }
 953
 954        if (user_config && !access_or_die(user_config, R_OK)) {
 955                ret += git_config_from_file(fn, user_config, data);
 956                found += 1;
 957        }
 958
 959        if (repo_config && !access_or_die(repo_config, R_OK)) {
 960                ret += git_config_from_file(fn, repo_config, data);
 961                found += 1;
 962        }
 963
 964        switch (git_config_from_parameters(fn, data)) {
 965        case -1: /* error */
 966                die("unable to parse command-line config");
 967                break;
 968        case 0: /* found nothing */
 969                break;
 970        default: /* found at least one item */
 971                found++;
 972                break;
 973        }
 974
 975        free(xdg_config);
 976        free(user_config);
 977        return ret == 0 ? found : ret;
 978}
 979
 980int git_config_with_options(config_fn_t fn, void *data,
 981                            const char *filename, int respect_includes)
 982{
 983        char *repo_config = NULL;
 984        int ret;
 985        struct config_include_data inc = CONFIG_INCLUDE_INIT;
 986
 987        if (respect_includes) {
 988                inc.fn = fn;
 989                inc.data = data;
 990                fn = git_config_include;
 991                data = &inc;
 992        }
 993
 994        /*
 995         * If we have a specific filename, use it. Otherwise, follow the
 996         * regular lookup sequence.
 997         */
 998        if (filename)
 999                return git_config_from_file(fn, filename, data);
1000
1001        repo_config = git_pathdup("config");
1002        ret = git_config_early(fn, data, repo_config);
1003        if (repo_config)
1004                free(repo_config);
1005        return ret;
1006}
1007
1008int git_config(config_fn_t fn, void *data)
1009{
1010        return git_config_with_options(fn, data, NULL, 1);
1011}
1012
1013/*
1014 * Find all the stuff for git_config_set() below.
1015 */
1016
1017#define MAX_MATCHES 512
1018
1019static struct {
1020        int baselen;
1021        char *key;
1022        int do_not_match;
1023        regex_t *value_regex;
1024        int multi_replace;
1025        size_t offset[MAX_MATCHES];
1026        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
1027        int seen;
1028} store;
1029
1030static int matches(const char *key, const char *value)
1031{
1032        return !strcmp(key, store.key) &&
1033                (store.value_regex == NULL ||
1034                 (store.do_not_match ^
1035                  !regexec(store.value_regex, value, 0, NULL, 0)));
1036}
1037
1038static int store_aux(const char *key, const char *value, void *cb)
1039{
1040        const char *ep;
1041        size_t section_len;
1042        FILE *f = cf->f;
1043
1044        switch (store.state) {
1045        case KEY_SEEN:
1046                if (matches(key, value)) {
1047                        if (store.seen == 1 && store.multi_replace == 0) {
1048                                warning("%s has multiple values", key);
1049                        } else if (store.seen >= MAX_MATCHES) {
1050                                error("too many matches for %s", key);
1051                                return 1;
1052                        }
1053
1054                        store.offset[store.seen] = ftell(f);
1055                        store.seen++;
1056                }
1057                break;
1058        case SECTION_SEEN:
1059                /*
1060                 * What we are looking for is in store.key (both
1061                 * section and var), and its section part is baselen
1062                 * long.  We found key (again, both section and var).
1063                 * We would want to know if this key is in the same
1064                 * section as what we are looking for.  We already
1065                 * know we are in the same section as what should
1066                 * hold store.key.
1067                 */
1068                ep = strrchr(key, '.');
1069                section_len = ep - key;
1070
1071                if ((section_len != store.baselen) ||
1072                    memcmp(key, store.key, section_len+1)) {
1073                        store.state = SECTION_END_SEEN;
1074                        break;
1075                }
1076
1077                /*
1078                 * Do not increment matches: this is no match, but we
1079                 * just made sure we are in the desired section.
1080                 */
1081                store.offset[store.seen] = ftell(f);
1082                /* fallthru */
1083        case SECTION_END_SEEN:
1084        case START:
1085                if (matches(key, value)) {
1086                        store.offset[store.seen] = ftell(f);
1087                        store.state = KEY_SEEN;
1088                        store.seen++;
1089                } else {
1090                        if (strrchr(key, '.') - key == store.baselen &&
1091                              !strncmp(key, store.key, store.baselen)) {
1092                                        store.state = SECTION_SEEN;
1093                                        store.offset[store.seen] = ftell(f);
1094                        }
1095                }
1096        }
1097        return 0;
1098}
1099
1100static int write_error(const char *filename)
1101{
1102        error("failed to write new configuration file %s", filename);
1103
1104        /* Same error code as "failed to rename". */
1105        return 4;
1106}
1107
1108static int store_write_section(int fd, const char *key)
1109{
1110        const char *dot;
1111        int i, success;
1112        struct strbuf sb = STRBUF_INIT;
1113
1114        dot = memchr(key, '.', store.baselen);
1115        if (dot) {
1116                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1117                for (i = dot - key + 1; i < store.baselen; i++) {
1118                        if (key[i] == '"' || key[i] == '\\')
1119                                strbuf_addch(&sb, '\\');
1120                        strbuf_addch(&sb, key[i]);
1121                }
1122                strbuf_addstr(&sb, "\"]\n");
1123        } else {
1124                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1125        }
1126
1127        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1128        strbuf_release(&sb);
1129
1130        return success;
1131}
1132
1133static int store_write_pair(int fd, const char *key, const char *value)
1134{
1135        int i, success;
1136        int length = strlen(key + store.baselen + 1);
1137        const char *quote = "";
1138        struct strbuf sb = STRBUF_INIT;
1139
1140        /*
1141         * Check to see if the value needs to be surrounded with a dq pair.
1142         * Note that problematic characters are always backslash-quoted; this
1143         * check is about not losing leading or trailing SP and strings that
1144         * follow beginning-of-comment characters (i.e. ';' and '#') by the
1145         * configuration parser.
1146         */
1147        if (value[0] == ' ')
1148                quote = "\"";
1149        for (i = 0; value[i]; i++)
1150                if (value[i] == ';' || value[i] == '#')
1151                        quote = "\"";
1152        if (i && value[i - 1] == ' ')
1153                quote = "\"";
1154
1155        strbuf_addf(&sb, "\t%.*s = %s",
1156                    length, key + store.baselen + 1, quote);
1157
1158        for (i = 0; value[i]; i++)
1159                switch (value[i]) {
1160                case '\n':
1161                        strbuf_addstr(&sb, "\\n");
1162                        break;
1163                case '\t':
1164                        strbuf_addstr(&sb, "\\t");
1165                        break;
1166                case '"':
1167                case '\\':
1168                        strbuf_addch(&sb, '\\');
1169                default:
1170                        strbuf_addch(&sb, value[i]);
1171                        break;
1172                }
1173        strbuf_addf(&sb, "%s\n", quote);
1174
1175        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1176        strbuf_release(&sb);
1177
1178        return success;
1179}
1180
1181static ssize_t find_beginning_of_line(const char *contents, size_t size,
1182        size_t offset_, int *found_bracket)
1183{
1184        size_t equal_offset = size, bracket_offset = size;
1185        ssize_t offset;
1186
1187contline:
1188        for (offset = offset_-2; offset > 0
1189                        && contents[offset] != '\n'; offset--)
1190                switch (contents[offset]) {
1191                        case '=': equal_offset = offset; break;
1192                        case ']': bracket_offset = offset; break;
1193                }
1194        if (offset > 0 && contents[offset-1] == '\\') {
1195                offset_ = offset;
1196                goto contline;
1197        }
1198        if (bracket_offset < equal_offset) {
1199                *found_bracket = 1;
1200                offset = bracket_offset+1;
1201        } else
1202                offset++;
1203
1204        return offset;
1205}
1206
1207int git_config_set_in_file(const char *config_filename,
1208                        const char *key, const char *value)
1209{
1210        return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1211}
1212
1213int git_config_set(const char *key, const char *value)
1214{
1215        return git_config_set_multivar(key, value, NULL, 0);
1216}
1217
1218/*
1219 * Auxiliary function to sanity-check and split the key into the section
1220 * identifier and variable name.
1221 *
1222 * Returns 0 on success, -1 when there is an invalid character in the key and
1223 * -2 if there is no section name in the key.
1224 *
1225 * store_key - pointer to char* which will hold a copy of the key with
1226 *             lowercase section and variable name
1227 * baselen - pointer to int which will hold the length of the
1228 *           section + subsection part, can be NULL
1229 */
1230int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1231{
1232        int i, dot, baselen;
1233        const char *last_dot = strrchr(key, '.');
1234
1235        /*
1236         * Since "key" actually contains the section name and the real
1237         * key name separated by a dot, we have to know where the dot is.
1238         */
1239
1240        if (last_dot == NULL || last_dot == key) {
1241                error("key does not contain a section: %s", key);
1242                return -CONFIG_NO_SECTION_OR_NAME;
1243        }
1244
1245        if (!last_dot[1]) {
1246                error("key does not contain variable name: %s", key);
1247                return -CONFIG_NO_SECTION_OR_NAME;
1248        }
1249
1250        baselen = last_dot - key;
1251        if (baselen_)
1252                *baselen_ = baselen;
1253
1254        /*
1255         * Validate the key and while at it, lower case it for matching.
1256         */
1257        *store_key = xmalloc(strlen(key) + 1);
1258
1259        dot = 0;
1260        for (i = 0; key[i]; i++) {
1261                unsigned char c = key[i];
1262                if (c == '.')
1263                        dot = 1;
1264                /* Leave the extended basename untouched.. */
1265                if (!dot || i > baselen) {
1266                        if (!iskeychar(c) ||
1267                            (i == baselen + 1 && !isalpha(c))) {
1268                                error("invalid key: %s", key);
1269                                goto out_free_ret_1;
1270                        }
1271                        c = tolower(c);
1272                } else if (c == '\n') {
1273                        error("invalid key (newline): %s", key);
1274                        goto out_free_ret_1;
1275                }
1276                (*store_key)[i] = c;
1277        }
1278        (*store_key)[i] = 0;
1279
1280        return 0;
1281
1282out_free_ret_1:
1283        free(*store_key);
1284        *store_key = NULL;
1285        return -CONFIG_INVALID_KEY;
1286}
1287
1288/*
1289 * If value==NULL, unset in (remove from) config,
1290 * if value_regex!=NULL, disregard key/value pairs where value does not match.
1291 * if multi_replace==0, nothing, or only one matching key/value is replaced,
1292 *     else all matching key/values (regardless how many) are removed,
1293 *     before the new pair is written.
1294 *
1295 * Returns 0 on success.
1296 *
1297 * This function does this:
1298 *
1299 * - it locks the config file by creating ".git/config.lock"
1300 *
1301 * - it then parses the config using store_aux() as validator to find
1302 *   the position on the key/value pair to replace. If it is to be unset,
1303 *   it must be found exactly once.
1304 *
1305 * - the config file is mmap()ed and the part before the match (if any) is
1306 *   written to the lock file, then the changed part and the rest.
1307 *
1308 * - the config file is removed and the lock file rename()d to it.
1309 *
1310 */
1311int git_config_set_multivar_in_file(const char *config_filename,
1312                                const char *key, const char *value,
1313                                const char *value_regex, int multi_replace)
1314{
1315        int fd = -1, in_fd;
1316        int ret;
1317        struct lock_file *lock = NULL;
1318        char *filename_buf = NULL;
1319
1320        /* parse-key returns negative; flip the sign to feed exit(3) */
1321        ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1322        if (ret)
1323                goto out_free;
1324
1325        store.multi_replace = multi_replace;
1326
1327        if (!config_filename)
1328                config_filename = filename_buf = git_pathdup("config");
1329
1330        /*
1331         * The lock serves a purpose in addition to locking: the new
1332         * contents of .git/config will be written into it.
1333         */
1334        lock = xcalloc(sizeof(struct lock_file), 1);
1335        fd = hold_lock_file_for_update(lock, config_filename, 0);
1336        if (fd < 0) {
1337                error("could not lock config file %s: %s", config_filename, strerror(errno));
1338                free(store.key);
1339                ret = CONFIG_NO_LOCK;
1340                goto out_free;
1341        }
1342
1343        /*
1344         * If .git/config does not exist yet, write a minimal version.
1345         */
1346        in_fd = open(config_filename, O_RDONLY);
1347        if ( in_fd < 0 ) {
1348                free(store.key);
1349
1350                if ( ENOENT != errno ) {
1351                        error("opening %s: %s", config_filename,
1352                              strerror(errno));
1353                        ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1354                        goto out_free;
1355                }
1356                /* if nothing to unset, error out */
1357                if (value == NULL) {
1358                        ret = CONFIG_NOTHING_SET;
1359                        goto out_free;
1360                }
1361
1362                store.key = (char *)key;
1363                if (!store_write_section(fd, key) ||
1364                    !store_write_pair(fd, key, value))
1365                        goto write_err_out;
1366        } else {
1367                struct stat st;
1368                char *contents;
1369                size_t contents_sz, copy_begin, copy_end;
1370                int i, new_line = 0;
1371
1372                if (value_regex == NULL)
1373                        store.value_regex = NULL;
1374                else {
1375                        if (value_regex[0] == '!') {
1376                                store.do_not_match = 1;
1377                                value_regex++;
1378                        } else
1379                                store.do_not_match = 0;
1380
1381                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1382                        if (regcomp(store.value_regex, value_regex,
1383                                        REG_EXTENDED)) {
1384                                error("invalid pattern: %s", value_regex);
1385                                free(store.value_regex);
1386                                ret = CONFIG_INVALID_PATTERN;
1387                                goto out_free;
1388                        }
1389                }
1390
1391                store.offset[0] = 0;
1392                store.state = START;
1393                store.seen = 0;
1394
1395                /*
1396                 * After this, store.offset will contain the *end* offset
1397                 * of the last match, or remain at 0 if no match was found.
1398                 * As a side effect, we make sure to transform only a valid
1399                 * existing config file.
1400                 */
1401                if (git_config_from_file(store_aux, config_filename, NULL)) {
1402                        error("invalid config file %s", config_filename);
1403                        free(store.key);
1404                        if (store.value_regex != NULL) {
1405                                regfree(store.value_regex);
1406                                free(store.value_regex);
1407                        }
1408                        ret = CONFIG_INVALID_FILE;
1409                        goto out_free;
1410                }
1411
1412                free(store.key);
1413                if (store.value_regex != NULL) {
1414                        regfree(store.value_regex);
1415                        free(store.value_regex);
1416                }
1417
1418                /* if nothing to unset, or too many matches, error out */
1419                if ((store.seen == 0 && value == NULL) ||
1420                                (store.seen > 1 && multi_replace == 0)) {
1421                        ret = CONFIG_NOTHING_SET;
1422                        goto out_free;
1423                }
1424
1425                fstat(in_fd, &st);
1426                contents_sz = xsize_t(st.st_size);
1427                contents = xmmap(NULL, contents_sz, PROT_READ,
1428                        MAP_PRIVATE, in_fd, 0);
1429                close(in_fd);
1430
1431                if (store.seen == 0)
1432                        store.seen = 1;
1433
1434                for (i = 0, copy_begin = 0; i < store.seen; i++) {
1435                        if (store.offset[i] == 0) {
1436                                store.offset[i] = copy_end = contents_sz;
1437                        } else if (store.state != KEY_SEEN) {
1438                                copy_end = store.offset[i];
1439                        } else
1440                                copy_end = find_beginning_of_line(
1441                                        contents, contents_sz,
1442                                        store.offset[i]-2, &new_line);
1443
1444                        if (copy_end > 0 && contents[copy_end-1] != '\n')
1445                                new_line = 1;
1446
1447                        /* write the first part of the config */
1448                        if (copy_end > copy_begin) {
1449                                if (write_in_full(fd, contents + copy_begin,
1450                                                  copy_end - copy_begin) <
1451                                    copy_end - copy_begin)
1452                                        goto write_err_out;
1453                                if (new_line &&
1454                                    write_str_in_full(fd, "\n") != 1)
1455                                        goto write_err_out;
1456                        }
1457                        copy_begin = store.offset[i];
1458                }
1459
1460                /* write the pair (value == NULL means unset) */
1461                if (value != NULL) {
1462                        if (store.state == START) {
1463                                if (!store_write_section(fd, key))
1464                                        goto write_err_out;
1465                        }
1466                        if (!store_write_pair(fd, key, value))
1467                                goto write_err_out;
1468                }
1469
1470                /* write the rest of the config */
1471                if (copy_begin < contents_sz)
1472                        if (write_in_full(fd, contents + copy_begin,
1473                                          contents_sz - copy_begin) <
1474                            contents_sz - copy_begin)
1475                                goto write_err_out;
1476
1477                munmap(contents, contents_sz);
1478        }
1479
1480        if (commit_lock_file(lock) < 0) {
1481                error("could not commit config file %s", config_filename);
1482                ret = CONFIG_NO_WRITE;
1483                goto out_free;
1484        }
1485
1486        /*
1487         * lock is committed, so don't try to roll it back below.
1488         * NOTE: Since lockfile.c keeps a linked list of all created
1489         * lock_file structures, it isn't safe to free(lock).  It's
1490         * better to just leave it hanging around.
1491         */
1492        lock = NULL;
1493        ret = 0;
1494
1495out_free:
1496        if (lock)
1497                rollback_lock_file(lock);
1498        free(filename_buf);
1499        return ret;
1500
1501write_err_out:
1502        ret = write_error(lock->filename);
1503        goto out_free;
1504
1505}
1506
1507int git_config_set_multivar(const char *key, const char *value,
1508                        const char *value_regex, int multi_replace)
1509{
1510        return git_config_set_multivar_in_file(NULL, key, value, value_regex,
1511                                               multi_replace);
1512}
1513
1514static int section_name_match (const char *buf, const char *name)
1515{
1516        int i = 0, j = 0, dot = 0;
1517        if (buf[i] != '[')
1518                return 0;
1519        for (i = 1; buf[i] && buf[i] != ']'; i++) {
1520                if (!dot && isspace(buf[i])) {
1521                        dot = 1;
1522                        if (name[j++] != '.')
1523                                break;
1524                        for (i++; isspace(buf[i]); i++)
1525                                ; /* do nothing */
1526                        if (buf[i] != '"')
1527                                break;
1528                        continue;
1529                }
1530                if (buf[i] == '\\' && dot)
1531                        i++;
1532                else if (buf[i] == '"' && dot) {
1533                        for (i++; isspace(buf[i]); i++)
1534                                ; /* do_nothing */
1535                        break;
1536                }
1537                if (buf[i] != name[j++])
1538                        break;
1539        }
1540        if (buf[i] == ']' && name[j] == 0) {
1541                /*
1542                 * We match, now just find the right length offset by
1543                 * gobbling up any whitespace after it, as well
1544                 */
1545                i++;
1546                for (; buf[i] && isspace(buf[i]); i++)
1547                        ; /* do nothing */
1548                return i;
1549        }
1550        return 0;
1551}
1552
1553static int section_name_is_ok(const char *name)
1554{
1555        /* Empty section names are bogus. */
1556        if (!*name)
1557                return 0;
1558
1559        /*
1560         * Before a dot, we must be alphanumeric or dash. After the first dot,
1561         * anything goes, so we can stop checking.
1562         */
1563        for (; *name && *name != '.'; name++)
1564                if (*name != '-' && !isalnum(*name))
1565                        return 0;
1566        return 1;
1567}
1568
1569/* if new_name == NULL, the section is removed instead */
1570int git_config_rename_section_in_file(const char *config_filename,
1571                                      const char *old_name, const char *new_name)
1572{
1573        int ret = 0, remove = 0;
1574        char *filename_buf = NULL;
1575        struct lock_file *lock;
1576        int out_fd;
1577        char buf[1024];
1578        FILE *config_file;
1579
1580        if (new_name && !section_name_is_ok(new_name)) {
1581                ret = error("invalid section name: %s", new_name);
1582                goto out;
1583        }
1584
1585        if (!config_filename)
1586                config_filename = filename_buf = git_pathdup("config");
1587
1588        lock = xcalloc(sizeof(struct lock_file), 1);
1589        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1590        if (out_fd < 0) {
1591                ret = error("could not lock config file %s", config_filename);
1592                goto out;
1593        }
1594
1595        if (!(config_file = fopen(config_filename, "rb"))) {
1596                /* no config file means nothing to rename, no error */
1597                goto unlock_and_out;
1598        }
1599
1600        while (fgets(buf, sizeof(buf), config_file)) {
1601                int i;
1602                int length;
1603                char *output = buf;
1604                for (i = 0; buf[i] && isspace(buf[i]); i++)
1605                        ; /* do nothing */
1606                if (buf[i] == '[') {
1607                        /* it's a section */
1608                        int offset = section_name_match(&buf[i], old_name);
1609                        if (offset > 0) {
1610                                ret++;
1611                                if (new_name == NULL) {
1612                                        remove = 1;
1613                                        continue;
1614                                }
1615                                store.baselen = strlen(new_name);
1616                                if (!store_write_section(out_fd, new_name)) {
1617                                        ret = write_error(lock->filename);
1618                                        goto out;
1619                                }
1620                                /*
1621                                 * We wrote out the new section, with
1622                                 * a newline, now skip the old
1623                                 * section's length
1624                                 */
1625                                output += offset + i;
1626                                if (strlen(output) > 0) {
1627                                        /*
1628                                         * More content means there's
1629                                         * a declaration to put on the
1630                                         * next line; indent with a
1631                                         * tab
1632                                         */
1633                                        output -= 1;
1634                                        output[0] = '\t';
1635                                }
1636                        }
1637                        remove = 0;
1638                }
1639                if (remove)
1640                        continue;
1641                length = strlen(output);
1642                if (write_in_full(out_fd, output, length) != length) {
1643                        ret = write_error(lock->filename);
1644                        goto out;
1645                }
1646        }
1647        fclose(config_file);
1648unlock_and_out:
1649        if (commit_lock_file(lock) < 0)
1650                ret = error("could not commit config file %s", config_filename);
1651out:
1652        free(filename_buf);
1653        return ret;
1654}
1655
1656int git_config_rename_section(const char *old_name, const char *new_name)
1657{
1658        return git_config_rename_section_in_file(NULL, old_name, new_name);
1659}
1660
1661/*
1662 * Call this to report error for your variable that should not
1663 * get a boolean value (i.e. "[my] var" means "true").
1664 */
1665#undef config_error_nonbool
1666int config_error_nonbool(const char *var)
1667{
1668        return error("Missing value for '%s'", var);
1669}