Andrew's git / gitweb.git / config.c
?
config.con commit Allow custom "comment char" (eff80a9)
   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.commentchar")) {
 721                const char *comment;
 722                int ret = git_config_string(&comment, var, value);
 723                if (!ret)
 724                        comment_line_char = comment[0];
 725                return ret;
 726        }
 727
 728        if (!strcmp(var, "core.askpass"))
 729                return git_config_string(&askpass_program, var, value);
 730
 731        if (!strcmp(var, "core.excludesfile"))
 732                return git_config_pathname(&excludes_file, var, value);
 733
 734        if (!strcmp(var, "core.whitespace")) {
 735                if (!value)
 736                        return config_error_nonbool(var);
 737                whitespace_rule_cfg = parse_whitespace_rule(value);
 738                return 0;
 739        }
 740
 741        if (!strcmp(var, "core.fsyncobjectfiles")) {
 742                fsync_object_files = git_config_bool(var, value);
 743                return 0;
 744        }
 745
 746        if (!strcmp(var, "core.preloadindex")) {
 747                core_preload_index = git_config_bool(var, value);
 748                return 0;
 749        }
 750
 751        if (!strcmp(var, "core.createobject")) {
 752                if (!strcmp(value, "rename"))
 753                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 754                else if (!strcmp(value, "link"))
 755                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 756                else
 757                        die("Invalid mode for object creation: %s", value);
 758                return 0;
 759        }
 760
 761        if (!strcmp(var, "core.sparsecheckout")) {
 762                core_apply_sparse_checkout = git_config_bool(var, value);
 763                return 0;
 764        }
 765
 766        if (!strcmp(var, "core.precomposeunicode")) {
 767                precomposed_unicode = git_config_bool(var, value);
 768                return 0;
 769        }
 770
 771        /* Add other config variables here and to Documentation/config.txt. */
 772        return 0;
 773}
 774
 775static int git_default_i18n_config(const char *var, const char *value)
 776{
 777        if (!strcmp(var, "i18n.commitencoding"))
 778                return git_config_string(&git_commit_encoding, var, value);
 779
 780        if (!strcmp(var, "i18n.logoutputencoding"))
 781                return git_config_string(&git_log_output_encoding, var, value);
 782
 783        /* Add other config variables here and to Documentation/config.txt. */
 784        return 0;
 785}
 786
 787static int git_default_branch_config(const char *var, const char *value)
 788{
 789        if (!strcmp(var, "branch.autosetupmerge")) {
 790                if (value && !strcasecmp(value, "always")) {
 791                        git_branch_track = BRANCH_TRACK_ALWAYS;
 792                        return 0;
 793                }
 794                git_branch_track = git_config_bool(var, value);
 795                return 0;
 796        }
 797        if (!strcmp(var, "branch.autosetuprebase")) {
 798                if (!value)
 799                        return config_error_nonbool(var);
 800                else if (!strcmp(value, "never"))
 801                        autorebase = AUTOREBASE_NEVER;
 802                else if (!strcmp(value, "local"))
 803                        autorebase = AUTOREBASE_LOCAL;
 804                else if (!strcmp(value, "remote"))
 805                        autorebase = AUTOREBASE_REMOTE;
 806                else if (!strcmp(value, "always"))
 807                        autorebase = AUTOREBASE_ALWAYS;
 808                else
 809                        return error("Malformed value for %s", var);
 810                return 0;
 811        }
 812
 813        /* Add other config variables here and to Documentation/config.txt. */
 814        return 0;
 815}
 816
 817static int git_default_push_config(const char *var, const char *value)
 818{
 819        if (!strcmp(var, "push.default")) {
 820                if (!value)
 821                        return config_error_nonbool(var);
 822                else if (!strcmp(value, "nothing"))
 823                        push_default = PUSH_DEFAULT_NOTHING;
 824                else if (!strcmp(value, "matching"))
 825                        push_default = PUSH_DEFAULT_MATCHING;
 826                else if (!strcmp(value, "simple"))
 827                        push_default = PUSH_DEFAULT_SIMPLE;
 828                else if (!strcmp(value, "upstream"))
 829                        push_default = PUSH_DEFAULT_UPSTREAM;
 830                else if (!strcmp(value, "tracking")) /* deprecated */
 831                        push_default = PUSH_DEFAULT_UPSTREAM;
 832                else if (!strcmp(value, "current"))
 833                        push_default = PUSH_DEFAULT_CURRENT;
 834                else {
 835                        error("Malformed value for %s: %s", var, value);
 836                        return error("Must be one of nothing, matching, simple, "
 837                                     "upstream or current.");
 838                }
 839                return 0;
 840        }
 841
 842        /* Add other config variables here and to Documentation/config.txt. */
 843        return 0;
 844}
 845
 846static int git_default_mailmap_config(const char *var, const char *value)
 847{
 848        if (!strcmp(var, "mailmap.file"))
 849                return git_config_string(&git_mailmap_file, var, value);
 850        if (!strcmp(var, "mailmap.blob"))
 851                return git_config_string(&git_mailmap_blob, var, value);
 852
 853        /* Add other config variables here and to Documentation/config.txt. */
 854        return 0;
 855}
 856
 857int git_default_config(const char *var, const char *value, void *dummy)
 858{
 859        if (!prefixcmp(var, "core."))
 860                return git_default_core_config(var, value);
 861
 862        if (!prefixcmp(var, "user."))
 863                return git_ident_config(var, value, dummy);
 864
 865        if (!prefixcmp(var, "i18n."))
 866                return git_default_i18n_config(var, value);
 867
 868        if (!prefixcmp(var, "branch."))
 869                return git_default_branch_config(var, value);
 870
 871        if (!prefixcmp(var, "push."))
 872                return git_default_push_config(var, value);
 873
 874        if (!prefixcmp(var, "mailmap."))
 875                return git_default_mailmap_config(var, value);
 876
 877        if (!prefixcmp(var, "advice."))
 878                return git_default_advice_config(var, value);
 879
 880        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 881                pager_use_color = git_config_bool(var,value);
 882                return 0;
 883        }
 884
 885        if (!strcmp(var, "pack.packsizelimit")) {
 886                pack_size_limit_cfg = git_config_ulong(var, value);
 887                return 0;
 888        }
 889        /* Add other config variables here and to Documentation/config.txt. */
 890        return 0;
 891}
 892
 893int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 894{
 895        int ret;
 896        FILE *f = fopen(filename, "r");
 897
 898        ret = -1;
 899        if (f) {
 900                config_file top;
 901
 902                /* push config-file parsing state stack */
 903                top.prev = cf;
 904                top.f = f;
 905                top.name = filename;
 906                top.linenr = 1;
 907                top.eof = 0;
 908                strbuf_init(&top.value, 1024);
 909                strbuf_init(&top.var, 1024);
 910                cf = &top;
 911
 912                ret = git_parse_file(fn, data);
 913
 914                /* pop config-file parsing state stack */
 915                strbuf_release(&top.value);
 916                strbuf_release(&top.var);
 917                cf = top.prev;
 918
 919                fclose(f);
 920        }
 921        return ret;
 922}
 923
 924const char *git_etc_gitconfig(void)
 925{
 926        static const char *system_wide;
 927        if (!system_wide)
 928                system_wide = system_path(ETC_GITCONFIG);
 929        return system_wide;
 930}
 931
 932int git_env_bool(const char *k, int def)
 933{
 934        const char *v = getenv(k);
 935        return v ? git_config_bool(k, v) : def;
 936}
 937
 938int git_config_system(void)
 939{
 940        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 941}
 942
 943int git_config_early(config_fn_t fn, void *data, const char *repo_config)
 944{
 945        int ret = 0, found = 0;
 946        char *xdg_config = NULL;
 947        char *user_config = NULL;
 948
 949        home_config_paths(&user_config, &xdg_config, "config");
 950
 951        if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK)) {
 952                ret += git_config_from_file(fn, git_etc_gitconfig(),
 953                                            data);
 954                found += 1;
 955        }
 956
 957        if (xdg_config && !access_or_die(xdg_config, R_OK)) {
 958                ret += git_config_from_file(fn, xdg_config, data);
 959                found += 1;
 960        }
 961
 962        if (user_config && !access_or_die(user_config, R_OK)) {
 963                ret += git_config_from_file(fn, user_config, data);
 964                found += 1;
 965        }
 966
 967        if (repo_config && !access_or_die(repo_config, R_OK)) {
 968                ret += git_config_from_file(fn, repo_config, data);
 969                found += 1;
 970        }
 971
 972        switch (git_config_from_parameters(fn, data)) {
 973        case -1: /* error */
 974                die("unable to parse command-line config");
 975                break;
 976        case 0: /* found nothing */
 977                break;
 978        default: /* found at least one item */
 979                found++;
 980                break;
 981        }
 982
 983        free(xdg_config);
 984        free(user_config);
 985        return ret == 0 ? found : ret;
 986}
 987
 988int git_config_with_options(config_fn_t fn, void *data,
 989                            const char *filename, int respect_includes)
 990{
 991        char *repo_config = NULL;
 992        int ret;
 993        struct config_include_data inc = CONFIG_INCLUDE_INIT;
 994
 995        if (respect_includes) {
 996                inc.fn = fn;
 997                inc.data = data;
 998                fn = git_config_include;
 999                data = &inc;
1000        }
1001
1002        /*
1003         * If we have a specific filename, use it. Otherwise, follow the
1004         * regular lookup sequence.
1005         */
1006        if (filename)
1007                return git_config_from_file(fn, filename, data);
1008
1009        repo_config = git_pathdup("config");
1010        ret = git_config_early(fn, data, repo_config);
1011        if (repo_config)
1012                free(repo_config);
1013        return ret;
1014}
1015
1016int git_config(config_fn_t fn, void *data)
1017{
1018        return git_config_with_options(fn, data, NULL, 1);
1019}
1020
1021/*
1022 * Find all the stuff for git_config_set() below.
1023 */
1024
1025#define MAX_MATCHES 512
1026
1027static struct {
1028        int baselen;
1029        char *key;
1030        int do_not_match;
1031        regex_t *value_regex;
1032        int multi_replace;
1033        size_t offset[MAX_MATCHES];
1034        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
1035        int seen;
1036} store;
1037
1038static int matches(const char *key, const char *value)
1039{
1040        return !strcmp(key, store.key) &&
1041                (store.value_regex == NULL ||
1042                 (store.do_not_match ^
1043                  !regexec(store.value_regex, value, 0, NULL, 0)));
1044}
1045
1046static int store_aux(const char *key, const char *value, void *cb)
1047{
1048        const char *ep;
1049        size_t section_len;
1050        FILE *f = cf->f;
1051
1052        switch (store.state) {
1053        case KEY_SEEN:
1054                if (matches(key, value)) {
1055                        if (store.seen == 1 && store.multi_replace == 0) {
1056                                warning("%s has multiple values", key);
1057                        } else if (store.seen >= MAX_MATCHES) {
1058                                error("too many matches for %s", key);
1059                                return 1;
1060                        }
1061
1062                        store.offset[store.seen] = ftell(f);
1063                        store.seen++;
1064                }
1065                break;
1066        case SECTION_SEEN:
1067                /*
1068                 * What we are looking for is in store.key (both
1069                 * section and var), and its section part is baselen
1070                 * long.  We found key (again, both section and var).
1071                 * We would want to know if this key is in the same
1072                 * section as what we are looking for.  We already
1073                 * know we are in the same section as what should
1074                 * hold store.key.
1075                 */
1076                ep = strrchr(key, '.');
1077                section_len = ep - key;
1078
1079                if ((section_len != store.baselen) ||
1080                    memcmp(key, store.key, section_len+1)) {
1081                        store.state = SECTION_END_SEEN;
1082                        break;
1083                }
1084
1085                /*
1086                 * Do not increment matches: this is no match, but we
1087                 * just made sure we are in the desired section.
1088                 */
1089                store.offset[store.seen] = ftell(f);
1090                /* fallthru */
1091        case SECTION_END_SEEN:
1092        case START:
1093                if (matches(key, value)) {
1094                        store.offset[store.seen] = ftell(f);
1095                        store.state = KEY_SEEN;
1096                        store.seen++;
1097                } else {
1098                        if (strrchr(key, '.') - key == store.baselen &&
1099                              !strncmp(key, store.key, store.baselen)) {
1100                                        store.state = SECTION_SEEN;
1101                                        store.offset[store.seen] = ftell(f);
1102                        }
1103                }
1104        }
1105        return 0;
1106}
1107
1108static int write_error(const char *filename)
1109{
1110        error("failed to write new configuration file %s", filename);
1111
1112        /* Same error code as "failed to rename". */
1113        return 4;
1114}
1115
1116static int store_write_section(int fd, const char *key)
1117{
1118        const char *dot;
1119        int i, success;
1120        struct strbuf sb = STRBUF_INIT;
1121
1122        dot = memchr(key, '.', store.baselen);
1123        if (dot) {
1124                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1125                for (i = dot - key + 1; i < store.baselen; i++) {
1126                        if (key[i] == '"' || key[i] == '\\')
1127                                strbuf_addch(&sb, '\\');
1128                        strbuf_addch(&sb, key[i]);
1129                }
1130                strbuf_addstr(&sb, "\"]\n");
1131        } else {
1132                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1133        }
1134
1135        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1136        strbuf_release(&sb);
1137
1138        return success;
1139}
1140
1141static int store_write_pair(int fd, const char *key, const char *value)
1142{
1143        int i, success;
1144        int length = strlen(key + store.baselen + 1);
1145        const char *quote = "";
1146        struct strbuf sb = STRBUF_INIT;
1147
1148        /*
1149         * Check to see if the value needs to be surrounded with a dq pair.
1150         * Note that problematic characters are always backslash-quoted; this
1151         * check is about not losing leading or trailing SP and strings that
1152         * follow beginning-of-comment characters (i.e. ';' and '#') by the
1153         * configuration parser.
1154         */
1155        if (value[0] == ' ')
1156                quote = "\"";
1157        for (i = 0; value[i]; i++)
1158                if (value[i] == ';' || value[i] == '#')
1159                        quote = "\"";
1160        if (i && value[i - 1] == ' ')
1161                quote = "\"";
1162
1163        strbuf_addf(&sb, "\t%.*s = %s",
1164                    length, key + store.baselen + 1, quote);
1165
1166        for (i = 0; value[i]; i++)
1167                switch (value[i]) {
1168                case '\n':
1169                        strbuf_addstr(&sb, "\\n");
1170                        break;
1171                case '\t':
1172                        strbuf_addstr(&sb, "\\t");
1173                        break;
1174                case '"':
1175                case '\\':
1176                        strbuf_addch(&sb, '\\');
1177                default:
1178                        strbuf_addch(&sb, value[i]);
1179                        break;
1180                }
1181        strbuf_addf(&sb, "%s\n", quote);
1182
1183        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1184        strbuf_release(&sb);
1185
1186        return success;
1187}
1188
1189static ssize_t find_beginning_of_line(const char *contents, size_t size,
1190        size_t offset_, int *found_bracket)
1191{
1192        size_t equal_offset = size, bracket_offset = size;
1193        ssize_t offset;
1194
1195contline:
1196        for (offset = offset_-2; offset > 0
1197                        && contents[offset] != '\n'; offset--)
1198                switch (contents[offset]) {
1199                        case '=': equal_offset = offset; break;
1200                        case ']': bracket_offset = offset; break;
1201                }
1202        if (offset > 0 && contents[offset-1] == '\\') {
1203                offset_ = offset;
1204                goto contline;
1205        }
1206        if (bracket_offset < equal_offset) {
1207                *found_bracket = 1;
1208                offset = bracket_offset+1;
1209        } else
1210                offset++;
1211
1212        return offset;
1213}
1214
1215int git_config_set_in_file(const char *config_filename,
1216                        const char *key, const char *value)
1217{
1218        return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1219}
1220
1221int git_config_set(const char *key, const char *value)
1222{
1223        return git_config_set_multivar(key, value, NULL, 0);
1224}
1225
1226/*
1227 * Auxiliary function to sanity-check and split the key into the section
1228 * identifier and variable name.
1229 *
1230 * Returns 0 on success, -1 when there is an invalid character in the key and
1231 * -2 if there is no section name in the key.
1232 *
1233 * store_key - pointer to char* which will hold a copy of the key with
1234 *             lowercase section and variable name
1235 * baselen - pointer to int which will hold the length of the
1236 *           section + subsection part, can be NULL
1237 */
1238int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1239{
1240        int i, dot, baselen;
1241        const char *last_dot = strrchr(key, '.');
1242
1243        /*
1244         * Since "key" actually contains the section name and the real
1245         * key name separated by a dot, we have to know where the dot is.
1246         */
1247
1248        if (last_dot == NULL || last_dot == key) {
1249                error("key does not contain a section: %s", key);
1250                return -CONFIG_NO_SECTION_OR_NAME;
1251        }
1252
1253        if (!last_dot[1]) {
1254                error("key does not contain variable name: %s", key);
1255                return -CONFIG_NO_SECTION_OR_NAME;
1256        }
1257
1258        baselen = last_dot - key;
1259        if (baselen_)
1260                *baselen_ = baselen;
1261
1262        /*
1263         * Validate the key and while at it, lower case it for matching.
1264         */
1265        *store_key = xmalloc(strlen(key) + 1);
1266
1267        dot = 0;
1268        for (i = 0; key[i]; i++) {
1269                unsigned char c = key[i];
1270                if (c == '.')
1271                        dot = 1;
1272                /* Leave the extended basename untouched.. */
1273                if (!dot || i > baselen) {
1274                        if (!iskeychar(c) ||
1275                            (i == baselen + 1 && !isalpha(c))) {
1276                                error("invalid key: %s", key);
1277                                goto out_free_ret_1;
1278                        }
1279                        c = tolower(c);
1280                } else if (c == '\n') {
1281                        error("invalid key (newline): %s", key);
1282                        goto out_free_ret_1;
1283                }
1284                (*store_key)[i] = c;
1285        }
1286        (*store_key)[i] = 0;
1287
1288        return 0;
1289
1290out_free_ret_1:
1291        free(*store_key);
1292        *store_key = NULL;
1293        return -CONFIG_INVALID_KEY;
1294}
1295
1296/*
1297 * If value==NULL, unset in (remove from) config,
1298 * if value_regex!=NULL, disregard key/value pairs where value does not match.
1299 * if multi_replace==0, nothing, or only one matching key/value is replaced,
1300 *     else all matching key/values (regardless how many) are removed,
1301 *     before the new pair is written.
1302 *
1303 * Returns 0 on success.
1304 *
1305 * This function does this:
1306 *
1307 * - it locks the config file by creating ".git/config.lock"
1308 *
1309 * - it then parses the config using store_aux() as validator to find
1310 *   the position on the key/value pair to replace. If it is to be unset,
1311 *   it must be found exactly once.
1312 *
1313 * - the config file is mmap()ed and the part before the match (if any) is
1314 *   written to the lock file, then the changed part and the rest.
1315 *
1316 * - the config file is removed and the lock file rename()d to it.
1317 *
1318 */
1319int git_config_set_multivar_in_file(const char *config_filename,
1320                                const char *key, const char *value,
1321                                const char *value_regex, int multi_replace)
1322{
1323        int fd = -1, in_fd;
1324        int ret;
1325        struct lock_file *lock = NULL;
1326        char *filename_buf = NULL;
1327
1328        /* parse-key returns negative; flip the sign to feed exit(3) */
1329        ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1330        if (ret)
1331                goto out_free;
1332
1333        store.multi_replace = multi_replace;
1334
1335        if (!config_filename)
1336                config_filename = filename_buf = git_pathdup("config");
1337
1338        /*
1339         * The lock serves a purpose in addition to locking: the new
1340         * contents of .git/config will be written into it.
1341         */
1342        lock = xcalloc(sizeof(struct lock_file), 1);
1343        fd = hold_lock_file_for_update(lock, config_filename, 0);
1344        if (fd < 0) {
1345                error("could not lock config file %s: %s", config_filename, strerror(errno));
1346                free(store.key);
1347                ret = CONFIG_NO_LOCK;
1348                goto out_free;
1349        }
1350
1351        /*
1352         * If .git/config does not exist yet, write a minimal version.
1353         */
1354        in_fd = open(config_filename, O_RDONLY);
1355        if ( in_fd < 0 ) {
1356                free(store.key);
1357
1358                if ( ENOENT != errno ) {
1359                        error("opening %s: %s", config_filename,
1360                              strerror(errno));
1361                        ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1362                        goto out_free;
1363                }
1364                /* if nothing to unset, error out */
1365                if (value == NULL) {
1366                        ret = CONFIG_NOTHING_SET;
1367                        goto out_free;
1368                }
1369
1370                store.key = (char *)key;
1371                if (!store_write_section(fd, key) ||
1372                    !store_write_pair(fd, key, value))
1373                        goto write_err_out;
1374        } else {
1375                struct stat st;
1376                char *contents;
1377                size_t contents_sz, copy_begin, copy_end;
1378                int i, new_line = 0;
1379
1380                if (value_regex == NULL)
1381                        store.value_regex = NULL;
1382                else {
1383                        if (value_regex[0] == '!') {
1384                                store.do_not_match = 1;
1385                                value_regex++;
1386                        } else
1387                                store.do_not_match = 0;
1388
1389                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1390                        if (regcomp(store.value_regex, value_regex,
1391                                        REG_EXTENDED)) {
1392                                error("invalid pattern: %s", value_regex);
1393                                free(store.value_regex);
1394                                ret = CONFIG_INVALID_PATTERN;
1395                                goto out_free;
1396                        }
1397                }
1398
1399                store.offset[0] = 0;
1400                store.state = START;
1401                store.seen = 0;
1402
1403                /*
1404                 * After this, store.offset will contain the *end* offset
1405                 * of the last match, or remain at 0 if no match was found.
1406                 * As a side effect, we make sure to transform only a valid
1407                 * existing config file.
1408                 */
1409                if (git_config_from_file(store_aux, config_filename, NULL)) {
1410                        error("invalid config file %s", config_filename);
1411                        free(store.key);
1412                        if (store.value_regex != NULL) {
1413                                regfree(store.value_regex);
1414                                free(store.value_regex);
1415                        }
1416                        ret = CONFIG_INVALID_FILE;
1417                        goto out_free;
1418                }
1419
1420                free(store.key);
1421                if (store.value_regex != NULL) {
1422                        regfree(store.value_regex);
1423                        free(store.value_regex);
1424                }
1425
1426                /* if nothing to unset, or too many matches, error out */
1427                if ((store.seen == 0 && value == NULL) ||
1428                                (store.seen > 1 && multi_replace == 0)) {
1429                        ret = CONFIG_NOTHING_SET;
1430                        goto out_free;
1431                }
1432
1433                fstat(in_fd, &st);
1434                contents_sz = xsize_t(st.st_size);
1435                contents = xmmap(NULL, contents_sz, PROT_READ,
1436                        MAP_PRIVATE, in_fd, 0);
1437                close(in_fd);
1438
1439                if (store.seen == 0)
1440                        store.seen = 1;
1441
1442                for (i = 0, copy_begin = 0; i < store.seen; i++) {
1443                        if (store.offset[i] == 0) {
1444                                store.offset[i] = copy_end = contents_sz;
1445                        } else if (store.state != KEY_SEEN) {
1446                                copy_end = store.offset[i];
1447                        } else
1448                                copy_end = find_beginning_of_line(
1449                                        contents, contents_sz,
1450                                        store.offset[i]-2, &new_line);
1451
1452                        if (copy_end > 0 && contents[copy_end-1] != '\n')
1453                                new_line = 1;
1454
1455                        /* write the first part of the config */
1456                        if (copy_end > copy_begin) {
1457                                if (write_in_full(fd, contents + copy_begin,
1458                                                  copy_end - copy_begin) <
1459                                    copy_end - copy_begin)
1460                                        goto write_err_out;
1461                                if (new_line &&
1462                                    write_str_in_full(fd, "\n") != 1)
1463                                        goto write_err_out;
1464                        }
1465                        copy_begin = store.offset[i];
1466                }
1467
1468                /* write the pair (value == NULL means unset) */
1469                if (value != NULL) {
1470                        if (store.state == START) {
1471                                if (!store_write_section(fd, key))
1472                                        goto write_err_out;
1473                        }
1474                        if (!store_write_pair(fd, key, value))
1475                                goto write_err_out;
1476                }
1477
1478                /* write the rest of the config */
1479                if (copy_begin < contents_sz)
1480                        if (write_in_full(fd, contents + copy_begin,
1481                                          contents_sz - copy_begin) <
1482                            contents_sz - copy_begin)
1483                                goto write_err_out;
1484
1485                munmap(contents, contents_sz);
1486        }
1487
1488        if (commit_lock_file(lock) < 0) {
1489                error("could not commit config file %s", config_filename);
1490                ret = CONFIG_NO_WRITE;
1491                goto out_free;
1492        }
1493
1494        /*
1495         * lock is committed, so don't try to roll it back below.
1496         * NOTE: Since lockfile.c keeps a linked list of all created
1497         * lock_file structures, it isn't safe to free(lock).  It's
1498         * better to just leave it hanging around.
1499         */
1500        lock = NULL;
1501        ret = 0;
1502
1503out_free:
1504        if (lock)
1505                rollback_lock_file(lock);
1506        free(filename_buf);
1507        return ret;
1508
1509write_err_out:
1510        ret = write_error(lock->filename);
1511        goto out_free;
1512
1513}
1514
1515int git_config_set_multivar(const char *key, const char *value,
1516                        const char *value_regex, int multi_replace)
1517{
1518        return git_config_set_multivar_in_file(NULL, key, value, value_regex,
1519                                               multi_replace);
1520}
1521
1522static int section_name_match (const char *buf, const char *name)
1523{
1524        int i = 0, j = 0, dot = 0;
1525        if (buf[i] != '[')
1526                return 0;
1527        for (i = 1; buf[i] && buf[i] != ']'; i++) {
1528                if (!dot && isspace(buf[i])) {
1529                        dot = 1;
1530                        if (name[j++] != '.')
1531                                break;
1532                        for (i++; isspace(buf[i]); i++)
1533                                ; /* do nothing */
1534                        if (buf[i] != '"')
1535                                break;
1536                        continue;
1537                }
1538                if (buf[i] == '\\' && dot)
1539                        i++;
1540                else if (buf[i] == '"' && dot) {
1541                        for (i++; isspace(buf[i]); i++)
1542                                ; /* do_nothing */
1543                        break;
1544                }
1545                if (buf[i] != name[j++])
1546                        break;
1547        }
1548        if (buf[i] == ']' && name[j] == 0) {
1549                /*
1550                 * We match, now just find the right length offset by
1551                 * gobbling up any whitespace after it, as well
1552                 */
1553                i++;
1554                for (; buf[i] && isspace(buf[i]); i++)
1555                        ; /* do nothing */
1556                return i;
1557        }
1558        return 0;
1559}
1560
1561static int section_name_is_ok(const char *name)
1562{
1563        /* Empty section names are bogus. */
1564        if (!*name)
1565                return 0;
1566
1567        /*
1568         * Before a dot, we must be alphanumeric or dash. After the first dot,
1569         * anything goes, so we can stop checking.
1570         */
1571        for (; *name && *name != '.'; name++)
1572                if (*name != '-' && !isalnum(*name))
1573                        return 0;
1574        return 1;
1575}
1576
1577/* if new_name == NULL, the section is removed instead */
1578int git_config_rename_section_in_file(const char *config_filename,
1579                                      const char *old_name, const char *new_name)
1580{
1581        int ret = 0, remove = 0;
1582        char *filename_buf = NULL;
1583        struct lock_file *lock;
1584        int out_fd;
1585        char buf[1024];
1586        FILE *config_file;
1587
1588        if (new_name && !section_name_is_ok(new_name)) {
1589                ret = error("invalid section name: %s", new_name);
1590                goto out;
1591        }
1592
1593        if (!config_filename)
1594                config_filename = filename_buf = git_pathdup("config");
1595
1596        lock = xcalloc(sizeof(struct lock_file), 1);
1597        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1598        if (out_fd < 0) {
1599                ret = error("could not lock config file %s", config_filename);
1600                goto out;
1601        }
1602
1603        if (!(config_file = fopen(config_filename, "rb"))) {
1604                /* no config file means nothing to rename, no error */
1605                goto unlock_and_out;
1606        }
1607
1608        while (fgets(buf, sizeof(buf), config_file)) {
1609                int i;
1610                int length;
1611                char *output = buf;
1612                for (i = 0; buf[i] && isspace(buf[i]); i++)
1613                        ; /* do nothing */
1614                if (buf[i] == '[') {
1615                        /* it's a section */
1616                        int offset = section_name_match(&buf[i], old_name);
1617                        if (offset > 0) {
1618                                ret++;
1619                                if (new_name == NULL) {
1620                                        remove = 1;
1621                                        continue;
1622                                }
1623                                store.baselen = strlen(new_name);
1624                                if (!store_write_section(out_fd, new_name)) {
1625                                        ret = write_error(lock->filename);
1626                                        goto out;
1627                                }
1628                                /*
1629                                 * We wrote out the new section, with
1630                                 * a newline, now skip the old
1631                                 * section's length
1632                                 */
1633                                output += offset + i;
1634                                if (strlen(output) > 0) {
1635                                        /*
1636                                         * More content means there's
1637                                         * a declaration to put on the
1638                                         * next line; indent with a
1639                                         * tab
1640                                         */
1641                                        output -= 1;
1642                                        output[0] = '\t';
1643                                }
1644                        }
1645                        remove = 0;
1646                }
1647                if (remove)
1648                        continue;
1649                length = strlen(output);
1650                if (write_in_full(out_fd, output, length) != length) {
1651                        ret = write_error(lock->filename);
1652                        goto out;
1653                }
1654        }
1655        fclose(config_file);
1656unlock_and_out:
1657        if (commit_lock_file(lock) < 0)
1658                ret = error("could not commit config file %s", config_filename);
1659out:
1660        free(filename_buf);
1661        return ret;
1662}
1663
1664int git_config_rename_section(const char *old_name, const char *new_name)
1665{
1666        return git_config_rename_section_in_file(NULL, old_name, new_name);
1667}
1668
1669/*
1670 * Call this to report error for your variable that should not
1671 * get a boolean value (i.e. "[my] var" means "true").
1672 */
1673#undef config_error_nonbool
1674int config_error_nonbool(const char *var)
1675{
1676        return error("Missing value for '%s'", var);
1677}