Andrew's git / gitweb.git / config.c
?
config.con commit handle_path_include: don't look at NULL value (67beb60)
   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#define MAXNAME (256)
  14
  15typedef struct config_file {
  16        struct config_file *prev;
  17        FILE *f;
  18        const char *name;
  19        int linenr;
  20        int eof;
  21        struct strbuf value;
  22        char var[MAXNAME];
  23} config_file;
  24
  25static config_file *cf;
  26
  27static int zlib_compression_seen;
  28
  29#define MAX_INCLUDE_DEPTH 10
  30static const char include_depth_advice[] =
  31"exceeded maximum include depth (%d) while including\n"
  32"       %s\n"
  33"from\n"
  34"       %s\n"
  35"Do you have circular includes?";
  36static int handle_path_include(const char *path, struct config_include_data *inc)
  37{
  38        int ret = 0;
  39        struct strbuf buf = STRBUF_INIT;
  40        char *expanded;
  41
  42        if (!path)
  43                return config_error_nonbool("include.path");
  44
  45        expanded = expand_user_path(path);
  46        if (!expanded)
  47                return error("Could not expand include path '%s'", path);
  48        path = expanded;
  49
  50        /*
  51         * Use an absolute path as-is, but interpret relative paths
  52         * based on the including config file.
  53         */
  54        if (!is_absolute_path(path)) {
  55                char *slash;
  56
  57                if (!cf || !cf->name)
  58                        return error("relative config includes must come from files");
  59
  60                slash = find_last_dir_sep(cf->name);
  61                if (slash)
  62                        strbuf_add(&buf, cf->name, slash - cf->name + 1);
  63                strbuf_addstr(&buf, path);
  64                path = buf.buf;
  65        }
  66
  67        if (!access(path, R_OK)) {
  68                if (++inc->depth > MAX_INCLUDE_DEPTH)
  69                        die(include_depth_advice, MAX_INCLUDE_DEPTH, path,
  70                            cf && cf->name ? cf->name : "the command line");
  71                ret = git_config_from_file(git_config_include, path, inc);
  72                inc->depth--;
  73        }
  74        strbuf_release(&buf);
  75        free(expanded);
  76        return ret;
  77}
  78
  79int git_config_include(const char *var, const char *value, void *data)
  80{
  81        struct config_include_data *inc = data;
  82        const char *type;
  83        int ret;
  84
  85        /*
  86         * Pass along all values, including "include" directives; this makes it
  87         * possible to query information on the includes themselves.
  88         */
  89        ret = inc->fn(var, value, inc->data);
  90        if (ret < 0)
  91                return ret;
  92
  93        type = skip_prefix(var, "include.");
  94        if (!type)
  95                return ret;
  96
  97        if (!strcmp(type, "path"))
  98                ret = handle_path_include(value, inc);
  99        return ret;
 100}
 101
 102static void lowercase(char *p)
 103{
 104        for (; *p; p++)
 105                *p = tolower(*p);
 106}
 107
 108void git_config_push_parameter(const char *text)
 109{
 110        struct strbuf env = STRBUF_INIT;
 111        const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
 112        if (old) {
 113                strbuf_addstr(&env, old);
 114                strbuf_addch(&env, ' ');
 115        }
 116        sq_quote_buf(&env, text);
 117        setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
 118        strbuf_release(&env);
 119}
 120
 121int git_config_parse_parameter(const char *text,
 122                               config_fn_t fn, void *data)
 123{
 124        struct strbuf **pair;
 125        pair = strbuf_split_str(text, '=', 2);
 126        if (!pair[0])
 127                return error("bogus config parameter: %s", text);
 128        if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=')
 129                strbuf_setlen(pair[0], pair[0]->len - 1);
 130        strbuf_trim(pair[0]);
 131        if (!pair[0]->len) {
 132                strbuf_list_free(pair);
 133                return error("bogus config parameter: %s", text);
 134        }
 135        lowercase(pair[0]->buf);
 136        if (fn(pair[0]->buf, pair[1] ? pair[1]->buf : NULL, data) < 0) {
 137                strbuf_list_free(pair);
 138                return -1;
 139        }
 140        strbuf_list_free(pair);
 141        return 0;
 142}
 143
 144int git_config_from_parameters(config_fn_t fn, void *data)
 145{
 146        const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
 147        char *envw;
 148        const char **argv = NULL;
 149        int nr = 0, alloc = 0;
 150        int i;
 151
 152        if (!env)
 153                return 0;
 154        /* sq_dequote will write over it */
 155        envw = xstrdup(env);
 156
 157        if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
 158                free(envw);
 159                return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
 160        }
 161
 162        for (i = 0; i < nr; i++) {
 163                if (git_config_parse_parameter(argv[i], fn, data) < 0) {
 164                        free(argv);
 165                        free(envw);
 166                        return -1;
 167                }
 168        }
 169
 170        free(argv);
 171        free(envw);
 172        return nr > 0;
 173}
 174
 175static int get_next_char(void)
 176{
 177        int c;
 178        FILE *f;
 179
 180        c = '\n';
 181        if (cf && ((f = cf->f) != NULL)) {
 182                c = fgetc(f);
 183                if (c == '\r') {
 184                        /* DOS like systems */
 185                        c = fgetc(f);
 186                        if (c != '\n') {
 187                                ungetc(c, f);
 188                                c = '\r';
 189                        }
 190                }
 191                if (c == '\n')
 192                        cf->linenr++;
 193                if (c == EOF) {
 194                        cf->eof = 1;
 195                        c = '\n';
 196                }
 197        }
 198        return c;
 199}
 200
 201static char *parse_value(void)
 202{
 203        int quote = 0, comment = 0, space = 0;
 204
 205        strbuf_reset(&cf->value);
 206        for (;;) {
 207                int c = get_next_char();
 208                if (c == '\n') {
 209                        if (quote) {
 210                                cf->linenr--;
 211                                return NULL;
 212                        }
 213                        return cf->value.buf;
 214                }
 215                if (comment)
 216                        continue;
 217                if (isspace(c) && !quote) {
 218                        if (cf->value.len)
 219                                space++;
 220                        continue;
 221                }
 222                if (!quote) {
 223                        if (c == ';' || c == '#') {
 224                                comment = 1;
 225                                continue;
 226                        }
 227                }
 228                for (; space; space--)
 229                        strbuf_addch(&cf->value, ' ');
 230                if (c == '\\') {
 231                        c = get_next_char();
 232                        switch (c) {
 233                        case '\n':
 234                                continue;
 235                        case 't':
 236                                c = '\t';
 237                                break;
 238                        case 'b':
 239                                c = '\b';
 240                                break;
 241                        case 'n':
 242                                c = '\n';
 243                                break;
 244                        /* Some characters escape as themselves */
 245                        case '\\': case '"':
 246                                break;
 247                        /* Reject unknown escape sequences */
 248                        default:
 249                                return NULL;
 250                        }
 251                        strbuf_addch(&cf->value, c);
 252                        continue;
 253                }
 254                if (c == '"') {
 255                        quote = 1-quote;
 256                        continue;
 257                }
 258                strbuf_addch(&cf->value, c);
 259        }
 260}
 261
 262static inline int iskeychar(int c)
 263{
 264        return isalnum(c) || c == '-';
 265}
 266
 267static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)
 268{
 269        int c;
 270        char *value;
 271
 272        /* Get the full name */
 273        for (;;) {
 274                c = get_next_char();
 275                if (cf->eof)
 276                        break;
 277                if (!iskeychar(c))
 278                        break;
 279                name[len++] = tolower(c);
 280                if (len >= MAXNAME)
 281                        return -1;
 282        }
 283        name[len] = 0;
 284        while (c == ' ' || c == '\t')
 285                c = get_next_char();
 286
 287        value = NULL;
 288        if (c != '\n') {
 289                if (c != '=')
 290                        return -1;
 291                value = parse_value();
 292                if (!value)
 293                        return -1;
 294        }
 295        return fn(name, value, data);
 296}
 297
 298static int get_extended_base_var(char *name, int baselen, int c)
 299{
 300        do {
 301                if (c == '\n')
 302                        goto error_incomplete_line;
 303                c = get_next_char();
 304        } while (isspace(c));
 305
 306        /* We require the format to be '[base "extension"]' */
 307        if (c != '"')
 308                return -1;
 309        name[baselen++] = '.';
 310
 311        for (;;) {
 312                int c = get_next_char();
 313                if (c == '\n')
 314                        goto error_incomplete_line;
 315                if (c == '"')
 316                        break;
 317                if (c == '\\') {
 318                        c = get_next_char();
 319                        if (c == '\n')
 320                                goto error_incomplete_line;
 321                }
 322                name[baselen++] = c;
 323                if (baselen > MAXNAME / 2)
 324                        return -1;
 325        }
 326
 327        /* Final ']' */
 328        if (get_next_char() != ']')
 329                return -1;
 330        return baselen;
 331error_incomplete_line:
 332        cf->linenr--;
 333        return -1;
 334}
 335
 336static int get_base_var(char *name)
 337{
 338        int baselen = 0;
 339
 340        for (;;) {
 341                int c = get_next_char();
 342                if (cf->eof)
 343                        return -1;
 344                if (c == ']')
 345                        return baselen;
 346                if (isspace(c))
 347                        return get_extended_base_var(name, baselen, c);
 348                if (!iskeychar(c) && c != '.')
 349                        return -1;
 350                if (baselen > MAXNAME / 2)
 351                        return -1;
 352                name[baselen++] = tolower(c);
 353        }
 354}
 355
 356static int git_parse_file(config_fn_t fn, void *data)
 357{
 358        int comment = 0;
 359        int baselen = 0;
 360        char *var = cf->var;
 361
 362        /* U+FEFF Byte Order Mark in UTF8 */
 363        static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
 364        const unsigned char *bomptr = utf8_bom;
 365
 366        for (;;) {
 367                int c = get_next_char();
 368                if (bomptr && *bomptr) {
 369                        /* We are at the file beginning; skip UTF8-encoded BOM
 370                         * if present. Sane editors won't put this in on their
 371                         * own, but e.g. Windows Notepad will do it happily. */
 372                        if ((unsigned char) c == *bomptr) {
 373                                bomptr++;
 374                                continue;
 375                        } else {
 376                                /* Do not tolerate partial BOM. */
 377                                if (bomptr != utf8_bom)
 378                                        break;
 379                                /* No BOM at file beginning. Cool. */
 380                                bomptr = NULL;
 381                        }
 382                }
 383                if (c == '\n') {
 384                        if (cf->eof)
 385                                return 0;
 386                        comment = 0;
 387                        continue;
 388                }
 389                if (comment || isspace(c))
 390                        continue;
 391                if (c == '#' || c == ';') {
 392                        comment = 1;
 393                        continue;
 394                }
 395                if (c == '[') {
 396                        baselen = get_base_var(var);
 397                        if (baselen <= 0)
 398                                break;
 399                        var[baselen++] = '.';
 400                        var[baselen] = 0;
 401                        continue;
 402                }
 403                if (!isalpha(c))
 404                        break;
 405                var[baselen] = tolower(c);
 406                if (get_value(fn, data, var, baselen+1) < 0)
 407                        break;
 408        }
 409        die("bad config file line %d in %s", cf->linenr, cf->name);
 410}
 411
 412static int parse_unit_factor(const char *end, uintmax_t *val)
 413{
 414        if (!*end)
 415                return 1;
 416        else if (!strcasecmp(end, "k")) {
 417                *val *= 1024;
 418                return 1;
 419        }
 420        else if (!strcasecmp(end, "m")) {
 421                *val *= 1024 * 1024;
 422                return 1;
 423        }
 424        else if (!strcasecmp(end, "g")) {
 425                *val *= 1024 * 1024 * 1024;
 426                return 1;
 427        }
 428        return 0;
 429}
 430
 431static int git_parse_long(const char *value, long *ret)
 432{
 433        if (value && *value) {
 434                char *end;
 435                intmax_t val;
 436                uintmax_t uval;
 437                uintmax_t factor = 1;
 438
 439                errno = 0;
 440                val = strtoimax(value, &end, 0);
 441                if (errno == ERANGE)
 442                        return 0;
 443                if (!parse_unit_factor(end, &factor))
 444                        return 0;
 445                uval = abs(val);
 446                uval *= factor;
 447                if ((uval > maximum_signed_value_of_type(long)) ||
 448                    (abs(val) > uval))
 449                        return 0;
 450                val *= factor;
 451                *ret = val;
 452                return 1;
 453        }
 454        return 0;
 455}
 456
 457int git_parse_ulong(const char *value, unsigned long *ret)
 458{
 459        if (value && *value) {
 460                char *end;
 461                uintmax_t val;
 462                uintmax_t oldval;
 463
 464                errno = 0;
 465                val = strtoumax(value, &end, 0);
 466                if (errno == ERANGE)
 467                        return 0;
 468                oldval = val;
 469                if (!parse_unit_factor(end, &val))
 470                        return 0;
 471                if ((val > maximum_unsigned_value_of_type(long)) ||
 472                    (oldval > val))
 473                        return 0;
 474                *ret = val;
 475                return 1;
 476        }
 477        return 0;
 478}
 479
 480static void die_bad_config(const char *name)
 481{
 482        if (cf && cf->name)
 483                die("bad config value for '%s' in %s", name, cf->name);
 484        die("bad config value for '%s'", name);
 485}
 486
 487int git_config_int(const char *name, const char *value)
 488{
 489        long ret = 0;
 490        if (!git_parse_long(value, &ret))
 491                die_bad_config(name);
 492        return ret;
 493}
 494
 495unsigned long git_config_ulong(const char *name, const char *value)
 496{
 497        unsigned long ret;
 498        if (!git_parse_ulong(value, &ret))
 499                die_bad_config(name);
 500        return ret;
 501}
 502
 503static int git_config_maybe_bool_text(const char *name, const char *value)
 504{
 505        if (!value)
 506                return 1;
 507        if (!*value)
 508                return 0;
 509        if (!strcasecmp(value, "true")
 510            || !strcasecmp(value, "yes")
 511            || !strcasecmp(value, "on"))
 512                return 1;
 513        if (!strcasecmp(value, "false")
 514            || !strcasecmp(value, "no")
 515            || !strcasecmp(value, "off"))
 516                return 0;
 517        return -1;
 518}
 519
 520int git_config_maybe_bool(const char *name, const char *value)
 521{
 522        long v = git_config_maybe_bool_text(name, value);
 523        if (0 <= v)
 524                return v;
 525        if (git_parse_long(value, &v))
 526                return !!v;
 527        return -1;
 528}
 529
 530int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 531{
 532        int v = git_config_maybe_bool_text(name, value);
 533        if (0 <= v) {
 534                *is_bool = 1;
 535                return v;
 536        }
 537        *is_bool = 0;
 538        return git_config_int(name, value);
 539}
 540
 541int git_config_bool(const char *name, const char *value)
 542{
 543        int discard;
 544        return !!git_config_bool_or_int(name, value, &discard);
 545}
 546
 547int git_config_string(const char **dest, const char *var, const char *value)
 548{
 549        if (!value)
 550                return config_error_nonbool(var);
 551        *dest = xstrdup(value);
 552        return 0;
 553}
 554
 555int git_config_pathname(const char **dest, const char *var, const char *value)
 556{
 557        if (!value)
 558                return config_error_nonbool(var);
 559        *dest = expand_user_path(value);
 560        if (!*dest)
 561                die("Failed to expand user dir in: '%s'", value);
 562        return 0;
 563}
 564
 565static int git_default_core_config(const char *var, const char *value)
 566{
 567        /* This needs a better name */
 568        if (!strcmp(var, "core.filemode")) {
 569                trust_executable_bit = git_config_bool(var, value);
 570                return 0;
 571        }
 572        if (!strcmp(var, "core.trustctime")) {
 573                trust_ctime = git_config_bool(var, value);
 574                return 0;
 575        }
 576
 577        if (!strcmp(var, "core.quotepath")) {
 578                quote_path_fully = git_config_bool(var, value);
 579                return 0;
 580        }
 581
 582        if (!strcmp(var, "core.symlinks")) {
 583                has_symlinks = git_config_bool(var, value);
 584                return 0;
 585        }
 586
 587        if (!strcmp(var, "core.ignorecase")) {
 588                ignore_case = git_config_bool(var, value);
 589                return 0;
 590        }
 591
 592        if (!strcmp(var, "core.attributesfile"))
 593                return git_config_pathname(&git_attributes_file, var, value);
 594
 595        if (!strcmp(var, "core.bare")) {
 596                is_bare_repository_cfg = git_config_bool(var, value);
 597                return 0;
 598        }
 599
 600        if (!strcmp(var, "core.ignorestat")) {
 601                assume_unchanged = git_config_bool(var, value);
 602                return 0;
 603        }
 604
 605        if (!strcmp(var, "core.prefersymlinkrefs")) {
 606                prefer_symlink_refs = git_config_bool(var, value);
 607                return 0;
 608        }
 609
 610        if (!strcmp(var, "core.logallrefupdates")) {
 611                log_all_ref_updates = git_config_bool(var, value);
 612                return 0;
 613        }
 614
 615        if (!strcmp(var, "core.warnambiguousrefs")) {
 616                warn_ambiguous_refs = git_config_bool(var, value);
 617                return 0;
 618        }
 619
 620        if (!strcmp(var, "core.abbrev")) {
 621                int abbrev = git_config_int(var, value);
 622                if (abbrev < minimum_abbrev || abbrev > 40)
 623                        return -1;
 624                default_abbrev = abbrev;
 625                return 0;
 626        }
 627
 628        if (!strcmp(var, "core.loosecompression")) {
 629                int level = git_config_int(var, value);
 630                if (level == -1)
 631                        level = Z_DEFAULT_COMPRESSION;
 632                else if (level < 0 || level > Z_BEST_COMPRESSION)
 633                        die("bad zlib compression level %d", level);
 634                zlib_compression_level = level;
 635                zlib_compression_seen = 1;
 636                return 0;
 637        }
 638
 639        if (!strcmp(var, "core.compression")) {
 640                int level = git_config_int(var, value);
 641                if (level == -1)
 642                        level = Z_DEFAULT_COMPRESSION;
 643                else if (level < 0 || level > Z_BEST_COMPRESSION)
 644                        die("bad zlib compression level %d", level);
 645                core_compression_level = level;
 646                core_compression_seen = 1;
 647                if (!zlib_compression_seen)
 648                        zlib_compression_level = level;
 649                return 0;
 650        }
 651
 652        if (!strcmp(var, "core.packedgitwindowsize")) {
 653                int pgsz_x2 = getpagesize() * 2;
 654                packed_git_window_size = git_config_ulong(var, value);
 655
 656                /* This value must be multiple of (pagesize * 2) */
 657                packed_git_window_size /= pgsz_x2;
 658                if (packed_git_window_size < 1)
 659                        packed_git_window_size = 1;
 660                packed_git_window_size *= pgsz_x2;
 661                return 0;
 662        }
 663
 664        if (!strcmp(var, "core.bigfilethreshold")) {
 665                big_file_threshold = git_config_ulong(var, value);
 666                return 0;
 667        }
 668
 669        if (!strcmp(var, "core.packedgitlimit")) {
 670                packed_git_limit = git_config_ulong(var, value);
 671                return 0;
 672        }
 673
 674        if (!strcmp(var, "core.deltabasecachelimit")) {
 675                delta_base_cache_limit = git_config_ulong(var, value);
 676                return 0;
 677        }
 678
 679        if (!strcmp(var, "core.logpackaccess"))
 680                return git_config_string(&log_pack_access, var, value);
 681
 682        if (!strcmp(var, "core.autocrlf")) {
 683                if (value && !strcasecmp(value, "input")) {
 684                        if (core_eol == EOL_CRLF)
 685                                return error("core.autocrlf=input conflicts with core.eol=crlf");
 686                        auto_crlf = AUTO_CRLF_INPUT;
 687                        return 0;
 688                }
 689                auto_crlf = git_config_bool(var, value);
 690                return 0;
 691        }
 692
 693        if (!strcmp(var, "core.safecrlf")) {
 694                if (value && !strcasecmp(value, "warn")) {
 695                        safe_crlf = SAFE_CRLF_WARN;
 696                        return 0;
 697                }
 698                safe_crlf = git_config_bool(var, value);
 699                return 0;
 700        }
 701
 702        if (!strcmp(var, "core.eol")) {
 703                if (value && !strcasecmp(value, "lf"))
 704                        core_eol = EOL_LF;
 705                else if (value && !strcasecmp(value, "crlf"))
 706                        core_eol = EOL_CRLF;
 707                else if (value && !strcasecmp(value, "native"))
 708                        core_eol = EOL_NATIVE;
 709                else
 710                        core_eol = EOL_UNSET;
 711                if (core_eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 712                        return error("core.autocrlf=input conflicts with core.eol=crlf");
 713                return 0;
 714        }
 715
 716        if (!strcmp(var, "core.notesref")) {
 717                notes_ref_name = xstrdup(value);
 718                return 0;
 719        }
 720
 721        if (!strcmp(var, "core.pager"))
 722                return git_config_string(&pager_program, var, value);
 723
 724        if (!strcmp(var, "core.editor"))
 725                return git_config_string(&editor_program, var, value);
 726
 727        if (!strcmp(var, "core.askpass"))
 728                return git_config_string(&askpass_program, var, value);
 729
 730        if (!strcmp(var, "core.excludesfile"))
 731                return git_config_pathname(&excludes_file, var, value);
 732
 733        if (!strcmp(var, "core.whitespace")) {
 734                if (!value)
 735                        return config_error_nonbool(var);
 736                whitespace_rule_cfg = parse_whitespace_rule(value);
 737                return 0;
 738        }
 739
 740        if (!strcmp(var, "core.fsyncobjectfiles")) {
 741                fsync_object_files = git_config_bool(var, value);
 742                return 0;
 743        }
 744
 745        if (!strcmp(var, "core.preloadindex")) {
 746                core_preload_index = git_config_bool(var, value);
 747                return 0;
 748        }
 749
 750        if (!strcmp(var, "core.createobject")) {
 751                if (!strcmp(value, "rename"))
 752                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 753                else if (!strcmp(value, "link"))
 754                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 755                else
 756                        die("Invalid mode for object creation: %s", value);
 757                return 0;
 758        }
 759
 760        if (!strcmp(var, "core.sparsecheckout")) {
 761                core_apply_sparse_checkout = git_config_bool(var, value);
 762                return 0;
 763        }
 764
 765        /* Add other config variables here and to Documentation/config.txt. */
 766        return 0;
 767}
 768
 769static int git_default_user_config(const char *var, const char *value)
 770{
 771        if (!strcmp(var, "user.name")) {
 772                if (!value)
 773                        return config_error_nonbool(var);
 774                strlcpy(git_default_name, value, sizeof(git_default_name));
 775                user_ident_explicitly_given |= IDENT_NAME_GIVEN;
 776                return 0;
 777        }
 778
 779        if (!strcmp(var, "user.email")) {
 780                if (!value)
 781                        return config_error_nonbool(var);
 782                strlcpy(git_default_email, value, sizeof(git_default_email));
 783                user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 784                return 0;
 785        }
 786
 787        /* Add other config variables here and to Documentation/config.txt. */
 788        return 0;
 789}
 790
 791static int git_default_i18n_config(const char *var, const char *value)
 792{
 793        if (!strcmp(var, "i18n.commitencoding"))
 794                return git_config_string(&git_commit_encoding, var, value);
 795
 796        if (!strcmp(var, "i18n.logoutputencoding"))
 797                return git_config_string(&git_log_output_encoding, var, value);
 798
 799        /* Add other config variables here and to Documentation/config.txt. */
 800        return 0;
 801}
 802
 803static int git_default_branch_config(const char *var, const char *value)
 804{
 805        if (!strcmp(var, "branch.autosetupmerge")) {
 806                if (value && !strcasecmp(value, "always")) {
 807                        git_branch_track = BRANCH_TRACK_ALWAYS;
 808                        return 0;
 809                }
 810                git_branch_track = git_config_bool(var, value);
 811                return 0;
 812        }
 813        if (!strcmp(var, "branch.autosetuprebase")) {
 814                if (!value)
 815                        return config_error_nonbool(var);
 816                else if (!strcmp(value, "never"))
 817                        autorebase = AUTOREBASE_NEVER;
 818                else if (!strcmp(value, "local"))
 819                        autorebase = AUTOREBASE_LOCAL;
 820                else if (!strcmp(value, "remote"))
 821                        autorebase = AUTOREBASE_REMOTE;
 822                else if (!strcmp(value, "always"))
 823                        autorebase = AUTOREBASE_ALWAYS;
 824                else
 825                        return error("Malformed value for %s", var);
 826                return 0;
 827        }
 828
 829        /* Add other config variables here and to Documentation/config.txt. */
 830        return 0;
 831}
 832
 833static int git_default_push_config(const char *var, const char *value)
 834{
 835        if (!strcmp(var, "push.default")) {
 836                if (!value)
 837                        return config_error_nonbool(var);
 838                else if (!strcmp(value, "nothing"))
 839                        push_default = PUSH_DEFAULT_NOTHING;
 840                else if (!strcmp(value, "matching"))
 841                        push_default = PUSH_DEFAULT_MATCHING;
 842                else if (!strcmp(value, "upstream"))
 843                        push_default = PUSH_DEFAULT_UPSTREAM;
 844                else if (!strcmp(value, "tracking")) /* deprecated */
 845                        push_default = PUSH_DEFAULT_UPSTREAM;
 846                else if (!strcmp(value, "current"))
 847                        push_default = PUSH_DEFAULT_CURRENT;
 848                else {
 849                        error("Malformed value for %s: %s", var, value);
 850                        return error("Must be one of nothing, matching, "
 851                                     "tracking or current.");
 852                }
 853                return 0;
 854        }
 855
 856        /* Add other config variables here and to Documentation/config.txt. */
 857        return 0;
 858}
 859
 860static int git_default_mailmap_config(const char *var, const char *value)
 861{
 862        if (!strcmp(var, "mailmap.file"))
 863                return git_config_string(&git_mailmap_file, var, value);
 864
 865        /* Add other config variables here and to Documentation/config.txt. */
 866        return 0;
 867}
 868
 869int git_default_config(const char *var, const char *value, void *dummy)
 870{
 871        if (!prefixcmp(var, "core."))
 872                return git_default_core_config(var, value);
 873
 874        if (!prefixcmp(var, "user."))
 875                return git_default_user_config(var, value);
 876
 877        if (!prefixcmp(var, "i18n."))
 878                return git_default_i18n_config(var, value);
 879
 880        if (!prefixcmp(var, "branch."))
 881                return git_default_branch_config(var, value);
 882
 883        if (!prefixcmp(var, "push."))
 884                return git_default_push_config(var, value);
 885
 886        if (!prefixcmp(var, "mailmap."))
 887                return git_default_mailmap_config(var, value);
 888
 889        if (!prefixcmp(var, "advice."))
 890                return git_default_advice_config(var, value);
 891
 892        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 893                pager_use_color = git_config_bool(var,value);
 894                return 0;
 895        }
 896
 897        if (!strcmp(var, "pack.packsizelimit")) {
 898                pack_size_limit_cfg = git_config_ulong(var, value);
 899                return 0;
 900        }
 901        /* Add other config variables here and to Documentation/config.txt. */
 902        return 0;
 903}
 904
 905int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 906{
 907        int ret;
 908        FILE *f = fopen(filename, "r");
 909
 910        ret = -1;
 911        if (f) {
 912                config_file top;
 913
 914                /* push config-file parsing state stack */
 915                top.prev = cf;
 916                top.f = f;
 917                top.name = filename;
 918                top.linenr = 1;
 919                top.eof = 0;
 920                strbuf_init(&top.value, 1024);
 921                cf = &top;
 922
 923                ret = git_parse_file(fn, data);
 924
 925                /* pop config-file parsing state stack */
 926                strbuf_release(&top.value);
 927                cf = top.prev;
 928
 929                fclose(f);
 930        }
 931        return ret;
 932}
 933
 934const char *git_etc_gitconfig(void)
 935{
 936        static const char *system_wide;
 937        if (!system_wide)
 938                system_wide = system_path(ETC_GITCONFIG);
 939        return system_wide;
 940}
 941
 942int git_env_bool(const char *k, int def)
 943{
 944        const char *v = getenv(k);
 945        return v ? git_config_bool(k, v) : def;
 946}
 947
 948int git_config_system(void)
 949{
 950        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 951}
 952
 953int git_config_early(config_fn_t fn, void *data, const char *repo_config)
 954{
 955        int ret = 0, found = 0;
 956        const char *home = NULL;
 957
 958        if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
 959                ret += git_config_from_file(fn, git_etc_gitconfig(),
 960                                            data);
 961                found += 1;
 962        }
 963
 964        home = getenv("HOME");
 965        if (home) {
 966                char buf[PATH_MAX];
 967                char *user_config = mksnpath(buf, sizeof(buf), "%s/.gitconfig", home);
 968                if (!access(user_config, R_OK)) {
 969                        ret += git_config_from_file(fn, user_config, data);
 970                        found += 1;
 971                }
 972        }
 973
 974        if (repo_config && !access(repo_config, R_OK)) {
 975                ret += git_config_from_file(fn, repo_config, data);
 976                found += 1;
 977        }
 978
 979        switch (git_config_from_parameters(fn, data)) {
 980        case -1: /* error */
 981                die("unable to parse command-line config");
 982                break;
 983        case 0: /* found nothing */
 984                break;
 985        default: /* found at least one item */
 986                found++;
 987                break;
 988        }
 989
 990        return ret == 0 ? found : ret;
 991}
 992
 993int git_config_with_options(config_fn_t fn, void *data,
 994                            const char *filename, int respect_includes)
 995{
 996        char *repo_config = NULL;
 997        int ret;
 998        struct config_include_data inc = CONFIG_INCLUDE_INIT;
 999
1000        if (respect_includes) {
1001                inc.fn = fn;
1002                inc.data = data;
1003                fn = git_config_include;
1004                data = &inc;
1005        }
1006
1007        /*
1008         * If we have a specific filename, use it. Otherwise, follow the
1009         * regular lookup sequence.
1010         */
1011        if (filename)
1012                return git_config_from_file(fn, filename, data);
1013
1014        repo_config = git_pathdup("config");
1015        ret = git_config_early(fn, data, repo_config);
1016        if (repo_config)
1017                free(repo_config);
1018        return ret;
1019}
1020
1021int git_config(config_fn_t fn, void *data)
1022{
1023        return git_config_with_options(fn, data, NULL, 1);
1024}
1025
1026/*
1027 * Find all the stuff for git_config_set() below.
1028 */
1029
1030#define MAX_MATCHES 512
1031
1032static struct {
1033        int baselen;
1034        char *key;
1035        int do_not_match;
1036        regex_t *value_regex;
1037        int multi_replace;
1038        size_t offset[MAX_MATCHES];
1039        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
1040        int seen;
1041} store;
1042
1043static int matches(const char *key, const char *value)
1044{
1045        return !strcmp(key, store.key) &&
1046                (store.value_regex == NULL ||
1047                 (store.do_not_match ^
1048                  !regexec(store.value_regex, value, 0, NULL, 0)));
1049}
1050
1051static int store_aux(const char *key, const char *value, void *cb)
1052{
1053        const char *ep;
1054        size_t section_len;
1055        FILE *f = cf->f;
1056
1057        switch (store.state) {
1058        case KEY_SEEN:
1059                if (matches(key, value)) {
1060                        if (store.seen == 1 && store.multi_replace == 0) {
1061                                warning("%s has multiple values", key);
1062                        } else if (store.seen >= MAX_MATCHES) {
1063                                error("too many matches for %s", key);
1064                                return 1;
1065                        }
1066
1067                        store.offset[store.seen] = ftell(f);
1068                        store.seen++;
1069                }
1070                break;
1071        case SECTION_SEEN:
1072                /*
1073                 * What we are looking for is in store.key (both
1074                 * section and var), and its section part is baselen
1075                 * long.  We found key (again, both section and var).
1076                 * We would want to know if this key is in the same
1077                 * section as what we are looking for.  We already
1078                 * know we are in the same section as what should
1079                 * hold store.key.
1080                 */
1081                ep = strrchr(key, '.');
1082                section_len = ep - key;
1083
1084                if ((section_len != store.baselen) ||
1085                    memcmp(key, store.key, section_len+1)) {
1086                        store.state = SECTION_END_SEEN;
1087                        break;
1088                }
1089
1090                /*
1091                 * Do not increment matches: this is no match, but we
1092                 * just made sure we are in the desired section.
1093                 */
1094                store.offset[store.seen] = ftell(f);
1095                /* fallthru */
1096        case SECTION_END_SEEN:
1097        case START:
1098                if (matches(key, value)) {
1099                        store.offset[store.seen] = ftell(f);
1100                        store.state = KEY_SEEN;
1101                        store.seen++;
1102                } else {
1103                        if (strrchr(key, '.') - key == store.baselen &&
1104                              !strncmp(key, store.key, store.baselen)) {
1105                                        store.state = SECTION_SEEN;
1106                                        store.offset[store.seen] = ftell(f);
1107                        }
1108                }
1109        }
1110        return 0;
1111}
1112
1113static int write_error(const char *filename)
1114{
1115        error("failed to write new configuration file %s", filename);
1116
1117        /* Same error code as "failed to rename". */
1118        return 4;
1119}
1120
1121static int store_write_section(int fd, const char *key)
1122{
1123        const char *dot;
1124        int i, success;
1125        struct strbuf sb = STRBUF_INIT;
1126
1127        dot = memchr(key, '.', store.baselen);
1128        if (dot) {
1129                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1130                for (i = dot - key + 1; i < store.baselen; i++) {
1131                        if (key[i] == '"' || key[i] == '\\')
1132                                strbuf_addch(&sb, '\\');
1133                        strbuf_addch(&sb, key[i]);
1134                }
1135                strbuf_addstr(&sb, "\"]\n");
1136        } else {
1137                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1138        }
1139
1140        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1141        strbuf_release(&sb);
1142
1143        return success;
1144}
1145
1146static int store_write_pair(int fd, const char *key, const char *value)
1147{
1148        int i, success;
1149        int length = strlen(key + store.baselen + 1);
1150        const char *quote = "";
1151        struct strbuf sb = STRBUF_INIT;
1152
1153        /*
1154         * Check to see if the value needs to be surrounded with a dq pair.
1155         * Note that problematic characters are always backslash-quoted; this
1156         * check is about not losing leading or trailing SP and strings that
1157         * follow beginning-of-comment characters (i.e. ';' and '#') by the
1158         * configuration parser.
1159         */
1160        if (value[0] == ' ')
1161                quote = "\"";
1162        for (i = 0; value[i]; i++)
1163                if (value[i] == ';' || value[i] == '#')
1164                        quote = "\"";
1165        if (i && value[i - 1] == ' ')
1166                quote = "\"";
1167
1168        strbuf_addf(&sb, "\t%.*s = %s",
1169                    length, key + store.baselen + 1, quote);
1170
1171        for (i = 0; value[i]; i++)
1172                switch (value[i]) {
1173                case '\n':
1174                        strbuf_addstr(&sb, "\\n");
1175                        break;
1176                case '\t':
1177                        strbuf_addstr(&sb, "\\t");
1178                        break;
1179                case '"':
1180                case '\\':
1181                        strbuf_addch(&sb, '\\');
1182                default:
1183                        strbuf_addch(&sb, value[i]);
1184                        break;
1185                }
1186        strbuf_addf(&sb, "%s\n", quote);
1187
1188        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1189        strbuf_release(&sb);
1190
1191        return success;
1192}
1193
1194static ssize_t find_beginning_of_line(const char *contents, size_t size,
1195        size_t offset_, int *found_bracket)
1196{
1197        size_t equal_offset = size, bracket_offset = size;
1198        ssize_t offset;
1199
1200contline:
1201        for (offset = offset_-2; offset > 0
1202                        && contents[offset] != '\n'; offset--)
1203                switch (contents[offset]) {
1204                        case '=': equal_offset = offset; break;
1205                        case ']': bracket_offset = offset; break;
1206                }
1207        if (offset > 0 && contents[offset-1] == '\\') {
1208                offset_ = offset;
1209                goto contline;
1210        }
1211        if (bracket_offset < equal_offset) {
1212                *found_bracket = 1;
1213                offset = bracket_offset+1;
1214        } else
1215                offset++;
1216
1217        return offset;
1218}
1219
1220int git_config_set_in_file(const char *config_filename,
1221                        const char *key, const char *value)
1222{
1223        return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1224}
1225
1226int git_config_set(const char *key, const char *value)
1227{
1228        return git_config_set_multivar(key, value, NULL, 0);
1229}
1230
1231/*
1232 * Auxiliary function to sanity-check and split the key into the section
1233 * identifier and variable name.
1234 *
1235 * Returns 0 on success, -1 when there is an invalid character in the key and
1236 * -2 if there is no section name in the key.
1237 *
1238 * store_key - pointer to char* which will hold a copy of the key with
1239 *             lowercase section and variable name
1240 * baselen - pointer to int which will hold the length of the
1241 *           section + subsection part, can be NULL
1242 */
1243int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1244{
1245        int i, dot, baselen;
1246        const char *last_dot = strrchr(key, '.');
1247
1248        /*
1249         * Since "key" actually contains the section name and the real
1250         * key name separated by a dot, we have to know where the dot is.
1251         */
1252
1253        if (last_dot == NULL || last_dot == key) {
1254                error("key does not contain a section: %s", key);
1255                return -CONFIG_NO_SECTION_OR_NAME;
1256        }
1257
1258        if (!last_dot[1]) {
1259                error("key does not contain variable name: %s", key);
1260                return -CONFIG_NO_SECTION_OR_NAME;
1261        }
1262
1263        baselen = last_dot - key;
1264        if (baselen_)
1265                *baselen_ = baselen;
1266
1267        /*
1268         * Validate the key and while at it, lower case it for matching.
1269         */
1270        *store_key = xmalloc(strlen(key) + 1);
1271
1272        dot = 0;
1273        for (i = 0; key[i]; i++) {
1274                unsigned char c = key[i];
1275                if (c == '.')
1276                        dot = 1;
1277                /* Leave the extended basename untouched.. */
1278                if (!dot || i > baselen) {
1279                        if (!iskeychar(c) ||
1280                            (i == baselen + 1 && !isalpha(c))) {
1281                                error("invalid key: %s", key);
1282                                goto out_free_ret_1;
1283                        }
1284                        c = tolower(c);
1285                } else if (c == '\n') {
1286                        error("invalid key (newline): %s", key);
1287                        goto out_free_ret_1;
1288                }
1289                (*store_key)[i] = c;
1290        }
1291        (*store_key)[i] = 0;
1292
1293        return 0;
1294
1295out_free_ret_1:
1296        free(*store_key);
1297        return -CONFIG_INVALID_KEY;
1298}
1299
1300/*
1301 * If value==NULL, unset in (remove from) config,
1302 * if value_regex!=NULL, disregard key/value pairs where value does not match.
1303 * if multi_replace==0, nothing, or only one matching key/value is replaced,
1304 *     else all matching key/values (regardless how many) are removed,
1305 *     before the new pair is written.
1306 *
1307 * Returns 0 on success.
1308 *
1309 * This function does this:
1310 *
1311 * - it locks the config file by creating ".git/config.lock"
1312 *
1313 * - it then parses the config using store_aux() as validator to find
1314 *   the position on the key/value pair to replace. If it is to be unset,
1315 *   it must be found exactly once.
1316 *
1317 * - the config file is mmap()ed and the part before the match (if any) is
1318 *   written to the lock file, then the changed part and the rest.
1319 *
1320 * - the config file is removed and the lock file rename()d to it.
1321 *
1322 */
1323int git_config_set_multivar_in_file(const char *config_filename,
1324                                const char *key, const char *value,
1325                                const char *value_regex, int multi_replace)
1326{
1327        int fd = -1, in_fd;
1328        int ret;
1329        struct lock_file *lock = NULL;
1330        char *filename_buf = NULL;
1331
1332        /* parse-key returns negative; flip the sign to feed exit(3) */
1333        ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1334        if (ret)
1335                goto out_free;
1336
1337        store.multi_replace = multi_replace;
1338
1339        if (!config_filename)
1340                config_filename = filename_buf = git_pathdup("config");
1341
1342        /*
1343         * The lock serves a purpose in addition to locking: the new
1344         * contents of .git/config will be written into it.
1345         */
1346        lock = xcalloc(sizeof(struct lock_file), 1);
1347        fd = hold_lock_file_for_update(lock, config_filename, 0);
1348        if (fd < 0) {
1349                error("could not lock config file %s: %s", config_filename, strerror(errno));
1350                free(store.key);
1351                ret = CONFIG_NO_LOCK;
1352                goto out_free;
1353        }
1354
1355        /*
1356         * If .git/config does not exist yet, write a minimal version.
1357         */
1358        in_fd = open(config_filename, O_RDONLY);
1359        if ( in_fd < 0 ) {
1360                free(store.key);
1361
1362                if ( ENOENT != errno ) {
1363                        error("opening %s: %s", config_filename,
1364                              strerror(errno));
1365                        ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1366                        goto out_free;
1367                }
1368                /* if nothing to unset, error out */
1369                if (value == NULL) {
1370                        ret = CONFIG_NOTHING_SET;
1371                        goto out_free;
1372                }
1373
1374                store.key = (char *)key;
1375                if (!store_write_section(fd, key) ||
1376                    !store_write_pair(fd, key, value))
1377                        goto write_err_out;
1378        } else {
1379                struct stat st;
1380                char *contents;
1381                size_t contents_sz, copy_begin, copy_end;
1382                int i, new_line = 0;
1383
1384                if (value_regex == NULL)
1385                        store.value_regex = NULL;
1386                else {
1387                        if (value_regex[0] == '!') {
1388                                store.do_not_match = 1;
1389                                value_regex++;
1390                        } else
1391                                store.do_not_match = 0;
1392
1393                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1394                        if (regcomp(store.value_regex, value_regex,
1395                                        REG_EXTENDED)) {
1396                                error("invalid pattern: %s", value_regex);
1397                                free(store.value_regex);
1398                                ret = CONFIG_INVALID_PATTERN;
1399                                goto out_free;
1400                        }
1401                }
1402
1403                store.offset[0] = 0;
1404                store.state = START;
1405                store.seen = 0;
1406
1407                /*
1408                 * After this, store.offset will contain the *end* offset
1409                 * of the last match, or remain at 0 if no match was found.
1410                 * As a side effect, we make sure to transform only a valid
1411                 * existing config file.
1412                 */
1413                if (git_config_from_file(store_aux, config_filename, NULL)) {
1414                        error("invalid config file %s", config_filename);
1415                        free(store.key);
1416                        if (store.value_regex != NULL) {
1417                                regfree(store.value_regex);
1418                                free(store.value_regex);
1419                        }
1420                        ret = CONFIG_INVALID_FILE;
1421                        goto out_free;
1422                }
1423
1424                free(store.key);
1425                if (store.value_regex != NULL) {
1426                        regfree(store.value_regex);
1427                        free(store.value_regex);
1428                }
1429
1430                /* if nothing to unset, or too many matches, error out */
1431                if ((store.seen == 0 && value == NULL) ||
1432                                (store.seen > 1 && multi_replace == 0)) {
1433                        ret = CONFIG_NOTHING_SET;
1434                        goto out_free;
1435                }
1436
1437                fstat(in_fd, &st);
1438                contents_sz = xsize_t(st.st_size);
1439                contents = xmmap(NULL, contents_sz, PROT_READ,
1440                        MAP_PRIVATE, in_fd, 0);
1441                close(in_fd);
1442
1443                if (store.seen == 0)
1444                        store.seen = 1;
1445
1446                for (i = 0, copy_begin = 0; i < store.seen; i++) {
1447                        if (store.offset[i] == 0) {
1448                                store.offset[i] = copy_end = contents_sz;
1449                        } else if (store.state != KEY_SEEN) {
1450                                copy_end = store.offset[i];
1451                        } else
1452                                copy_end = find_beginning_of_line(
1453                                        contents, contents_sz,
1454                                        store.offset[i]-2, &new_line);
1455
1456                        if (copy_end > 0 && contents[copy_end-1] != '\n')
1457                                new_line = 1;
1458
1459                        /* write the first part of the config */
1460                        if (copy_end > copy_begin) {
1461                                if (write_in_full(fd, contents + copy_begin,
1462                                                  copy_end - copy_begin) <
1463                                    copy_end - copy_begin)
1464                                        goto write_err_out;
1465                                if (new_line &&
1466                                    write_str_in_full(fd, "\n") != 1)
1467                                        goto write_err_out;
1468                        }
1469                        copy_begin = store.offset[i];
1470                }
1471
1472                /* write the pair (value == NULL means unset) */
1473                if (value != NULL) {
1474                        if (store.state == START) {
1475                                if (!store_write_section(fd, key))
1476                                        goto write_err_out;
1477                        }
1478                        if (!store_write_pair(fd, key, value))
1479                                goto write_err_out;
1480                }
1481
1482                /* write the rest of the config */
1483                if (copy_begin < contents_sz)
1484                        if (write_in_full(fd, contents + copy_begin,
1485                                          contents_sz - copy_begin) <
1486                            contents_sz - copy_begin)
1487                                goto write_err_out;
1488
1489                munmap(contents, contents_sz);
1490        }
1491
1492        if (commit_lock_file(lock) < 0) {
1493                error("could not commit config file %s", config_filename);
1494                ret = CONFIG_NO_WRITE;
1495                goto out_free;
1496        }
1497
1498        /*
1499         * lock is committed, so don't try to roll it back below.
1500         * NOTE: Since lockfile.c keeps a linked list of all created
1501         * lock_file structures, it isn't safe to free(lock).  It's
1502         * better to just leave it hanging around.
1503         */
1504        lock = NULL;
1505        ret = 0;
1506
1507out_free:
1508        if (lock)
1509                rollback_lock_file(lock);
1510        free(filename_buf);
1511        return ret;
1512
1513write_err_out:
1514        ret = write_error(lock->filename);
1515        goto out_free;
1516
1517}
1518
1519int git_config_set_multivar(const char *key, const char *value,
1520                        const char *value_regex, int multi_replace)
1521{
1522        return git_config_set_multivar_in_file(NULL, key, value, value_regex,
1523                                               multi_replace);
1524}
1525
1526static int section_name_match (const char *buf, const char *name)
1527{
1528        int i = 0, j = 0, dot = 0;
1529        if (buf[i] != '[')
1530                return 0;
1531        for (i = 1; buf[i] && buf[i] != ']'; i++) {
1532                if (!dot && isspace(buf[i])) {
1533                        dot = 1;
1534                        if (name[j++] != '.')
1535                                break;
1536                        for (i++; isspace(buf[i]); i++)
1537                                ; /* do nothing */
1538                        if (buf[i] != '"')
1539                                break;
1540                        continue;
1541                }
1542                if (buf[i] == '\\' && dot)
1543                        i++;
1544                else if (buf[i] == '"' && dot) {
1545                        for (i++; isspace(buf[i]); i++)
1546                                ; /* do_nothing */
1547                        break;
1548                }
1549                if (buf[i] != name[j++])
1550                        break;
1551        }
1552        if (buf[i] == ']' && name[j] == 0) {
1553                /*
1554                 * We match, now just find the right length offset by
1555                 * gobbling up any whitespace after it, as well
1556                 */
1557                i++;
1558                for (; buf[i] && isspace(buf[i]); i++)
1559                        ; /* do nothing */
1560                return i;
1561        }
1562        return 0;
1563}
1564
1565/* if new_name == NULL, the section is removed instead */
1566int git_config_rename_section_in_file(const char *config_filename,
1567                                      const char *old_name, const char *new_name)
1568{
1569        int ret = 0, remove = 0;
1570        char *filename_buf = NULL;
1571        struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1572        int out_fd;
1573        char buf[1024];
1574        FILE *config_file;
1575
1576        if (!config_filename)
1577                config_filename = filename_buf = git_pathdup("config");
1578
1579        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1580        if (out_fd < 0) {
1581                ret = error("could not lock config file %s", config_filename);
1582                goto out;
1583        }
1584
1585        if (!(config_file = fopen(config_filename, "rb"))) {
1586                /* no config file means nothing to rename, no error */
1587                goto unlock_and_out;
1588        }
1589
1590        while (fgets(buf, sizeof(buf), config_file)) {
1591                int i;
1592                int length;
1593                char *output = buf;
1594                for (i = 0; buf[i] && isspace(buf[i]); i++)
1595                        ; /* do nothing */
1596                if (buf[i] == '[') {
1597                        /* it's a section */
1598                        int offset = section_name_match(&buf[i], old_name);
1599                        if (offset > 0) {
1600                                ret++;
1601                                if (new_name == NULL) {
1602                                        remove = 1;
1603                                        continue;
1604                                }
1605                                store.baselen = strlen(new_name);
1606                                if (!store_write_section(out_fd, new_name)) {
1607                                        ret = write_error(lock->filename);
1608                                        goto out;
1609                                }
1610                                /*
1611                                 * We wrote out the new section, with
1612                                 * a newline, now skip the old
1613                                 * section's length
1614                                 */
1615                                output += offset + i;
1616                                if (strlen(output) > 0) {
1617                                        /*
1618                                         * More content means there's
1619                                         * a declaration to put on the
1620                                         * next line; indent with a
1621                                         * tab
1622                                         */
1623                                        output -= 1;
1624                                        output[0] = '\t';
1625                                }
1626                        }
1627                        remove = 0;
1628                }
1629                if (remove)
1630                        continue;
1631                length = strlen(output);
1632                if (write_in_full(out_fd, output, length) != length) {
1633                        ret = write_error(lock->filename);
1634                        goto out;
1635                }
1636        }
1637        fclose(config_file);
1638unlock_and_out:
1639        if (commit_lock_file(lock) < 0)
1640                ret = error("could not commit config file %s", config_filename);
1641out:
1642        free(filename_buf);
1643        return ret;
1644}
1645
1646int git_config_rename_section(const char *old_name, const char *new_name)
1647{
1648        return git_config_rename_section_in_file(NULL, old_name, new_name);
1649}
1650
1651/*
1652 * Call this to report error for your variable that should not
1653 * get a boolean value (i.e. "[my] var" means "true").
1654 */
1655int config_error_nonbool(const char *var)
1656{
1657        return error("Missing value for '%s'", var);
1658}