Andrew's git / gitweb.git / config.c
?
config.con commit t6038 (merge.renormalize): try checkout -m and cherry-pick (d347cee)
   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
  12#define MAXNAME (256)
  13
  14static FILE *config_file;
  15static const char *config_file_name;
  16static int config_linenr;
  17static int config_file_eof;
  18static int zlib_compression_seen;
  19
  20const char *config_exclusive_filename = NULL;
  21
  22struct config_item
  23{
  24        struct config_item *next;
  25        char *name;
  26        char *value;
  27};
  28static struct config_item *config_parameters;
  29static struct config_item **config_parameters_tail = &config_parameters;
  30
  31static void lowercase(char *p)
  32{
  33        for (; *p; p++)
  34                *p = tolower(*p);
  35}
  36
  37int git_config_parse_parameter(const char *text)
  38{
  39        struct config_item *ct;
  40        struct strbuf tmp = STRBUF_INIT;
  41        struct strbuf **pair;
  42        strbuf_addstr(&tmp, text);
  43        pair = strbuf_split(&tmp, '=');
  44        if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=')
  45                strbuf_setlen(pair[0], pair[0]->len - 1);
  46        strbuf_trim(pair[0]);
  47        if (!pair[0]->len) {
  48                strbuf_list_free(pair);
  49                return -1;
  50        }
  51        ct = xcalloc(1, sizeof(struct config_item));
  52        ct->name = strbuf_detach(pair[0], NULL);
  53        if (pair[1]) {
  54                strbuf_trim(pair[1]);
  55                ct->value = strbuf_detach(pair[1], NULL);
  56        }
  57        strbuf_list_free(pair);
  58        lowercase(ct->name);
  59        *config_parameters_tail = ct;
  60        config_parameters_tail = &ct->next;
  61        return 0;
  62}
  63
  64static int get_next_char(void)
  65{
  66        int c;
  67        FILE *f;
  68
  69        c = '\n';
  70        if ((f = config_file) != NULL) {
  71                c = fgetc(f);
  72                if (c == '\r') {
  73                        /* DOS like systems */
  74                        c = fgetc(f);
  75                        if (c != '\n') {
  76                                ungetc(c, f);
  77                                c = '\r';
  78                        }
  79                }
  80                if (c == '\n')
  81                        config_linenr++;
  82                if (c == EOF) {
  83                        config_file_eof = 1;
  84                        c = '\n';
  85                }
  86        }
  87        return c;
  88}
  89
  90static char *parse_value(void)
  91{
  92        static char value[1024];
  93        int quote = 0, comment = 0, len = 0, space = 0;
  94
  95        for (;;) {
  96                int c = get_next_char();
  97                if (len >= sizeof(value) - 1)
  98                        return NULL;
  99                if (c == '\n') {
 100                        if (quote)
 101                                return NULL;
 102                        value[len] = 0;
 103                        return value;
 104                }
 105                if (comment)
 106                        continue;
 107                if (isspace(c) && !quote) {
 108                        if (len)
 109                                space++;
 110                        continue;
 111                }
 112                if (!quote) {
 113                        if (c == ';' || c == '#') {
 114                                comment = 1;
 115                                continue;
 116                        }
 117                }
 118                for (; space; space--)
 119                        value[len++] = ' ';
 120                if (c == '\\') {
 121                        c = get_next_char();
 122                        switch (c) {
 123                        case '\n':
 124                                continue;
 125                        case 't':
 126                                c = '\t';
 127                                break;
 128                        case 'b':
 129                                c = '\b';
 130                                break;
 131                        case 'n':
 132                                c = '\n';
 133                                break;
 134                        /* Some characters escape as themselves */
 135                        case '\\': case '"':
 136                                break;
 137                        /* Reject unknown escape sequences */
 138                        default:
 139                                return NULL;
 140                        }
 141                        value[len++] = c;
 142                        continue;
 143                }
 144                if (c == '"') {
 145                        quote = 1-quote;
 146                        continue;
 147                }
 148                value[len++] = c;
 149        }
 150}
 151
 152static inline int iskeychar(int c)
 153{
 154        return isalnum(c) || c == '-';
 155}
 156
 157static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)
 158{
 159        int c;
 160        char *value;
 161
 162        /* Get the full name */
 163        for (;;) {
 164                c = get_next_char();
 165                if (config_file_eof)
 166                        break;
 167                if (!iskeychar(c))
 168                        break;
 169                name[len++] = tolower(c);
 170                if (len >= MAXNAME)
 171                        return -1;
 172        }
 173        name[len] = 0;
 174        while (c == ' ' || c == '\t')
 175                c = get_next_char();
 176
 177        value = NULL;
 178        if (c != '\n') {
 179                if (c != '=')
 180                        return -1;
 181                value = parse_value();
 182                if (!value)
 183                        return -1;
 184        }
 185        return fn(name, value, data);
 186}
 187
 188static int get_extended_base_var(char *name, int baselen, int c)
 189{
 190        do {
 191                if (c == '\n')
 192                        return -1;
 193                c = get_next_char();
 194        } while (isspace(c));
 195
 196        /* We require the format to be '[base "extension"]' */
 197        if (c != '"')
 198                return -1;
 199        name[baselen++] = '.';
 200
 201        for (;;) {
 202                int c = get_next_char();
 203                if (c == '\n')
 204                        return -1;
 205                if (c == '"')
 206                        break;
 207                if (c == '\\') {
 208                        c = get_next_char();
 209                        if (c == '\n')
 210                                return -1;
 211                }
 212                name[baselen++] = c;
 213                if (baselen > MAXNAME / 2)
 214                        return -1;
 215        }
 216
 217        /* Final ']' */
 218        if (get_next_char() != ']')
 219                return -1;
 220        return baselen;
 221}
 222
 223static int get_base_var(char *name)
 224{
 225        int baselen = 0;
 226
 227        for (;;) {
 228                int c = get_next_char();
 229                if (config_file_eof)
 230                        return -1;
 231                if (c == ']')
 232                        return baselen;
 233                if (isspace(c))
 234                        return get_extended_base_var(name, baselen, c);
 235                if (!iskeychar(c) && c != '.')
 236                        return -1;
 237                if (baselen > MAXNAME / 2)
 238                        return -1;
 239                name[baselen++] = tolower(c);
 240        }
 241}
 242
 243static int git_parse_file(config_fn_t fn, void *data)
 244{
 245        int comment = 0;
 246        int baselen = 0;
 247        static char var[MAXNAME];
 248
 249        /* U+FEFF Byte Order Mark in UTF8 */
 250        static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
 251        const unsigned char *bomptr = utf8_bom;
 252
 253        for (;;) {
 254                int c = get_next_char();
 255                if (bomptr && *bomptr) {
 256                        /* We are at the file beginning; skip UTF8-encoded BOM
 257                         * if present. Sane editors won't put this in on their
 258                         * own, but e.g. Windows Notepad will do it happily. */
 259                        if ((unsigned char) c == *bomptr) {
 260                                bomptr++;
 261                                continue;
 262                        } else {
 263                                /* Do not tolerate partial BOM. */
 264                                if (bomptr != utf8_bom)
 265                                        break;
 266                                /* No BOM at file beginning. Cool. */
 267                                bomptr = NULL;
 268                        }
 269                }
 270                if (c == '\n') {
 271                        if (config_file_eof)
 272                                return 0;
 273                        comment = 0;
 274                        continue;
 275                }
 276                if (comment || isspace(c))
 277                        continue;
 278                if (c == '#' || c == ';') {
 279                        comment = 1;
 280                        continue;
 281                }
 282                if (c == '[') {
 283                        baselen = get_base_var(var);
 284                        if (baselen <= 0)
 285                                break;
 286                        var[baselen++] = '.';
 287                        var[baselen] = 0;
 288                        continue;
 289                }
 290                if (!isalpha(c))
 291                        break;
 292                var[baselen] = tolower(c);
 293                if (get_value(fn, data, var, baselen+1) < 0)
 294                        break;
 295        }
 296        die("bad config file line %d in %s", config_linenr, config_file_name);
 297}
 298
 299static int parse_unit_factor(const char *end, unsigned long *val)
 300{
 301        if (!*end)
 302                return 1;
 303        else if (!strcasecmp(end, "k")) {
 304                *val *= 1024;
 305                return 1;
 306        }
 307        else if (!strcasecmp(end, "m")) {
 308                *val *= 1024 * 1024;
 309                return 1;
 310        }
 311        else if (!strcasecmp(end, "g")) {
 312                *val *= 1024 * 1024 * 1024;
 313                return 1;
 314        }
 315        return 0;
 316}
 317
 318static int git_parse_long(const char *value, long *ret)
 319{
 320        if (value && *value) {
 321                char *end;
 322                long val = strtol(value, &end, 0);
 323                unsigned long factor = 1;
 324                if (!parse_unit_factor(end, &factor))
 325                        return 0;
 326                *ret = val * factor;
 327                return 1;
 328        }
 329        return 0;
 330}
 331
 332int git_parse_ulong(const char *value, unsigned long *ret)
 333{
 334        if (value && *value) {
 335                char *end;
 336                unsigned long val = strtoul(value, &end, 0);
 337                if (!parse_unit_factor(end, &val))
 338                        return 0;
 339                *ret = val;
 340                return 1;
 341        }
 342        return 0;
 343}
 344
 345static void die_bad_config(const char *name)
 346{
 347        if (config_file_name)
 348                die("bad config value for '%s' in %s", name, config_file_name);
 349        die("bad config value for '%s'", name);
 350}
 351
 352int git_config_int(const char *name, const char *value)
 353{
 354        long ret = 0;
 355        if (!git_parse_long(value, &ret))
 356                die_bad_config(name);
 357        return ret;
 358}
 359
 360unsigned long git_config_ulong(const char *name, const char *value)
 361{
 362        unsigned long ret;
 363        if (!git_parse_ulong(value, &ret))
 364                die_bad_config(name);
 365        return ret;
 366}
 367
 368int git_config_maybe_bool(const char *name, const char *value)
 369{
 370        if (!value)
 371                return 1;
 372        if (!*value)
 373                return 0;
 374        if (!strcasecmp(value, "true")
 375            || !strcasecmp(value, "yes")
 376            || !strcasecmp(value, "on"))
 377                return 1;
 378        if (!strcasecmp(value, "false")
 379            || !strcasecmp(value, "no")
 380            || !strcasecmp(value, "off"))
 381                return 0;
 382        return -1;
 383}
 384
 385int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 386{
 387        int v = git_config_maybe_bool(name, value);
 388        if (0 <= v) {
 389                *is_bool = 1;
 390                return v;
 391        }
 392        *is_bool = 0;
 393        return git_config_int(name, value);
 394}
 395
 396int git_config_bool(const char *name, const char *value)
 397{
 398        int discard;
 399        return !!git_config_bool_or_int(name, value, &discard);
 400}
 401
 402int git_config_string(const char **dest, const char *var, const char *value)
 403{
 404        if (!value)
 405                return config_error_nonbool(var);
 406        *dest = xstrdup(value);
 407        return 0;
 408}
 409
 410int git_config_pathname(const char **dest, const char *var, const char *value)
 411{
 412        if (!value)
 413                return config_error_nonbool(var);
 414        *dest = expand_user_path(value);
 415        if (!*dest)
 416                die("Failed to expand user dir in: '%s'", value);
 417        return 0;
 418}
 419
 420static int git_default_core_config(const char *var, const char *value)
 421{
 422        /* This needs a better name */
 423        if (!strcmp(var, "core.filemode")) {
 424                trust_executable_bit = git_config_bool(var, value);
 425                return 0;
 426        }
 427        if (!strcmp(var, "core.trustctime")) {
 428                trust_ctime = git_config_bool(var, value);
 429                return 0;
 430        }
 431
 432        if (!strcmp(var, "core.quotepath")) {
 433                quote_path_fully = git_config_bool(var, value);
 434                return 0;
 435        }
 436
 437        if (!strcmp(var, "core.symlinks")) {
 438                has_symlinks = git_config_bool(var, value);
 439                return 0;
 440        }
 441
 442        if (!strcmp(var, "core.ignorecase")) {
 443                ignore_case = git_config_bool(var, value);
 444                return 0;
 445        }
 446
 447        if (!strcmp(var, "core.bare")) {
 448                is_bare_repository_cfg = git_config_bool(var, value);
 449                return 0;
 450        }
 451
 452        if (!strcmp(var, "core.ignorestat")) {
 453                assume_unchanged = git_config_bool(var, value);
 454                return 0;
 455        }
 456
 457        if (!strcmp(var, "core.prefersymlinkrefs")) {
 458                prefer_symlink_refs = git_config_bool(var, value);
 459                return 0;
 460        }
 461
 462        if (!strcmp(var, "core.logallrefupdates")) {
 463                log_all_ref_updates = git_config_bool(var, value);
 464                return 0;
 465        }
 466
 467        if (!strcmp(var, "core.warnambiguousrefs")) {
 468                warn_ambiguous_refs = git_config_bool(var, value);
 469                return 0;
 470        }
 471
 472        if (!strcmp(var, "core.loosecompression")) {
 473                int level = git_config_int(var, value);
 474                if (level == -1)
 475                        level = Z_DEFAULT_COMPRESSION;
 476                else if (level < 0 || level > Z_BEST_COMPRESSION)
 477                        die("bad zlib compression level %d", level);
 478                zlib_compression_level = level;
 479                zlib_compression_seen = 1;
 480                return 0;
 481        }
 482
 483        if (!strcmp(var, "core.compression")) {
 484                int level = git_config_int(var, value);
 485                if (level == -1)
 486                        level = Z_DEFAULT_COMPRESSION;
 487                else if (level < 0 || level > Z_BEST_COMPRESSION)
 488                        die("bad zlib compression level %d", level);
 489                core_compression_level = level;
 490                core_compression_seen = 1;
 491                if (!zlib_compression_seen)
 492                        zlib_compression_level = level;
 493                return 0;
 494        }
 495
 496        if (!strcmp(var, "core.packedgitwindowsize")) {
 497                int pgsz_x2 = getpagesize() * 2;
 498                packed_git_window_size = git_config_int(var, value);
 499
 500                /* This value must be multiple of (pagesize * 2) */
 501                packed_git_window_size /= pgsz_x2;
 502                if (packed_git_window_size < 1)
 503                        packed_git_window_size = 1;
 504                packed_git_window_size *= pgsz_x2;
 505                return 0;
 506        }
 507
 508        if (!strcmp(var, "core.packedgitlimit")) {
 509                packed_git_limit = git_config_int(var, value);
 510                return 0;
 511        }
 512
 513        if (!strcmp(var, "core.deltabasecachelimit")) {
 514                delta_base_cache_limit = git_config_int(var, value);
 515                return 0;
 516        }
 517
 518        if (!strcmp(var, "core.autocrlf")) {
 519                if (value && !strcasecmp(value, "input")) {
 520                        if (eol == EOL_CRLF)
 521                                return error("core.autocrlf=input conflicts with core.eol=crlf");
 522                        auto_crlf = AUTO_CRLF_INPUT;
 523                        return 0;
 524                }
 525                auto_crlf = git_config_bool(var, value);
 526                return 0;
 527        }
 528
 529        if (!strcmp(var, "core.safecrlf")) {
 530                if (value && !strcasecmp(value, "warn")) {
 531                        safe_crlf = SAFE_CRLF_WARN;
 532                        return 0;
 533                }
 534                safe_crlf = git_config_bool(var, value);
 535                return 0;
 536        }
 537
 538        if (!strcmp(var, "core.eol")) {
 539                if (value && !strcasecmp(value, "lf"))
 540                        eol = EOL_LF;
 541                else if (value && !strcasecmp(value, "crlf"))
 542                        eol = EOL_CRLF;
 543                else if (value && !strcasecmp(value, "native"))
 544                        eol = EOL_NATIVE;
 545                else
 546                        eol = EOL_UNSET;
 547                if (eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 548                        return error("core.autocrlf=input conflicts with core.eol=crlf");
 549                return 0;
 550        }
 551
 552        if (!strcmp(var, "core.notesref")) {
 553                notes_ref_name = xstrdup(value);
 554                return 0;
 555        }
 556
 557        if (!strcmp(var, "core.pager"))
 558                return git_config_string(&pager_program, var, value);
 559
 560        if (!strcmp(var, "core.editor"))
 561                return git_config_string(&editor_program, var, value);
 562
 563        if (!strcmp(var, "core.excludesfile"))
 564                return git_config_pathname(&excludes_file, var, value);
 565
 566        if (!strcmp(var, "core.whitespace")) {
 567                if (!value)
 568                        return config_error_nonbool(var);
 569                whitespace_rule_cfg = parse_whitespace_rule(value);
 570                return 0;
 571        }
 572
 573        if (!strcmp(var, "core.fsyncobjectfiles")) {
 574                fsync_object_files = git_config_bool(var, value);
 575                return 0;
 576        }
 577
 578        if (!strcmp(var, "core.preloadindex")) {
 579                core_preload_index = git_config_bool(var, value);
 580                return 0;
 581        }
 582
 583        if (!strcmp(var, "core.createobject")) {
 584                if (!strcmp(value, "rename"))
 585                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 586                else if (!strcmp(value, "link"))
 587                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 588                else
 589                        die("Invalid mode for object creation: %s", value);
 590                return 0;
 591        }
 592
 593        if (!strcmp(var, "core.sparsecheckout")) {
 594                core_apply_sparse_checkout = git_config_bool(var, value);
 595                return 0;
 596        }
 597
 598        /* Add other config variables here and to Documentation/config.txt. */
 599        return 0;
 600}
 601
 602static int git_default_user_config(const char *var, const char *value)
 603{
 604        if (!strcmp(var, "user.name")) {
 605                if (!value)
 606                        return config_error_nonbool(var);
 607                strlcpy(git_default_name, value, sizeof(git_default_name));
 608                user_ident_explicitly_given |= IDENT_NAME_GIVEN;
 609                return 0;
 610        }
 611
 612        if (!strcmp(var, "user.email")) {
 613                if (!value)
 614                        return config_error_nonbool(var);
 615                strlcpy(git_default_email, value, sizeof(git_default_email));
 616                user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 617                return 0;
 618        }
 619
 620        /* Add other config variables here and to Documentation/config.txt. */
 621        return 0;
 622}
 623
 624static int git_default_i18n_config(const char *var, const char *value)
 625{
 626        if (!strcmp(var, "i18n.commitencoding"))
 627                return git_config_string(&git_commit_encoding, var, value);
 628
 629        if (!strcmp(var, "i18n.logoutputencoding"))
 630                return git_config_string(&git_log_output_encoding, var, value);
 631
 632        /* Add other config variables here and to Documentation/config.txt. */
 633        return 0;
 634}
 635
 636static int git_default_branch_config(const char *var, const char *value)
 637{
 638        if (!strcmp(var, "branch.autosetupmerge")) {
 639                if (value && !strcasecmp(value, "always")) {
 640                        git_branch_track = BRANCH_TRACK_ALWAYS;
 641                        return 0;
 642                }
 643                git_branch_track = git_config_bool(var, value);
 644                return 0;
 645        }
 646        if (!strcmp(var, "branch.autosetuprebase")) {
 647                if (!value)
 648                        return config_error_nonbool(var);
 649                else if (!strcmp(value, "never"))
 650                        autorebase = AUTOREBASE_NEVER;
 651                else if (!strcmp(value, "local"))
 652                        autorebase = AUTOREBASE_LOCAL;
 653                else if (!strcmp(value, "remote"))
 654                        autorebase = AUTOREBASE_REMOTE;
 655                else if (!strcmp(value, "always"))
 656                        autorebase = AUTOREBASE_ALWAYS;
 657                else
 658                        return error("Malformed value for %s", var);
 659                return 0;
 660        }
 661
 662        /* Add other config variables here and to Documentation/config.txt. */
 663        return 0;
 664}
 665
 666static int git_default_push_config(const char *var, const char *value)
 667{
 668        if (!strcmp(var, "push.default")) {
 669                if (!value)
 670                        return config_error_nonbool(var);
 671                else if (!strcmp(value, "nothing"))
 672                        push_default = PUSH_DEFAULT_NOTHING;
 673                else if (!strcmp(value, "matching"))
 674                        push_default = PUSH_DEFAULT_MATCHING;
 675                else if (!strcmp(value, "tracking"))
 676                        push_default = PUSH_DEFAULT_TRACKING;
 677                else if (!strcmp(value, "current"))
 678                        push_default = PUSH_DEFAULT_CURRENT;
 679                else {
 680                        error("Malformed value for %s: %s", var, value);
 681                        return error("Must be one of nothing, matching, "
 682                                     "tracking or current.");
 683                }
 684                return 0;
 685        }
 686
 687        /* Add other config variables here and to Documentation/config.txt. */
 688        return 0;
 689}
 690
 691static int git_default_mailmap_config(const char *var, const char *value)
 692{
 693        if (!strcmp(var, "mailmap.file"))
 694                return git_config_string(&git_mailmap_file, var, value);
 695
 696        /* Add other config variables here and to Documentation/config.txt. */
 697        return 0;
 698}
 699
 700int git_default_config(const char *var, const char *value, void *dummy)
 701{
 702        if (!prefixcmp(var, "core."))
 703                return git_default_core_config(var, value);
 704
 705        if (!prefixcmp(var, "user."))
 706                return git_default_user_config(var, value);
 707
 708        if (!prefixcmp(var, "i18n."))
 709                return git_default_i18n_config(var, value);
 710
 711        if (!prefixcmp(var, "branch."))
 712                return git_default_branch_config(var, value);
 713
 714        if (!prefixcmp(var, "push."))
 715                return git_default_push_config(var, value);
 716
 717        if (!prefixcmp(var, "mailmap."))
 718                return git_default_mailmap_config(var, value);
 719
 720        if (!prefixcmp(var, "advice."))
 721                return git_default_advice_config(var, value);
 722
 723        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 724                pager_use_color = git_config_bool(var,value);
 725                return 0;
 726        }
 727
 728        /* Add other config variables here and to Documentation/config.txt. */
 729        return 0;
 730}
 731
 732int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 733{
 734        int ret;
 735        FILE *f = fopen(filename, "r");
 736
 737        ret = -1;
 738        if (f) {
 739                config_file = f;
 740                config_file_name = filename;
 741                config_linenr = 1;
 742                config_file_eof = 0;
 743                ret = git_parse_file(fn, data);
 744                fclose(f);
 745                config_file_name = NULL;
 746        }
 747        return ret;
 748}
 749
 750const char *git_etc_gitconfig(void)
 751{
 752        static const char *system_wide;
 753        if (!system_wide)
 754                system_wide = system_path(ETC_GITCONFIG);
 755        return system_wide;
 756}
 757
 758int git_env_bool(const char *k, int def)
 759{
 760        const char *v = getenv(k);
 761        return v ? git_config_bool(k, v) : def;
 762}
 763
 764int git_config_system(void)
 765{
 766        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 767}
 768
 769int git_config_global(void)
 770{
 771        return !git_env_bool("GIT_CONFIG_NOGLOBAL", 0);
 772}
 773
 774int git_config_from_parameters(config_fn_t fn, void *data)
 775{
 776        const struct config_item *ct;
 777        for (ct = config_parameters; ct; ct = ct->next)
 778                if (fn(ct->name, ct->value, data) < 0)
 779                        return -1;
 780        return 0;
 781}
 782
 783int git_config(config_fn_t fn, void *data)
 784{
 785        int ret = 0, found = 0;
 786        char *repo_config = NULL;
 787        const char *home = NULL;
 788
 789        /* Setting $GIT_CONFIG makes git read _only_ the given config file. */
 790        if (config_exclusive_filename)
 791                return git_config_from_file(fn, config_exclusive_filename, data);
 792        if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
 793                ret += git_config_from_file(fn, git_etc_gitconfig(),
 794                                            data);
 795                found += 1;
 796        }
 797
 798        home = getenv("HOME");
 799        if (git_config_global() && home) {
 800                char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
 801                if (!access(user_config, R_OK)) {
 802                        ret += git_config_from_file(fn, user_config, data);
 803                        found += 1;
 804                }
 805                free(user_config);
 806        }
 807
 808        repo_config = git_pathdup("config");
 809        if (!access(repo_config, R_OK)) {
 810                ret += git_config_from_file(fn, repo_config, data);
 811                found += 1;
 812        }
 813        free(repo_config);
 814
 815        if (config_parameters) {
 816                ret += git_config_from_parameters(fn, data);
 817                found += 1;
 818        }
 819
 820        if (found == 0)
 821                return -1;
 822        return ret;
 823}
 824
 825/*
 826 * Find all the stuff for git_config_set() below.
 827 */
 828
 829#define MAX_MATCHES 512
 830
 831static struct {
 832        int baselen;
 833        char *key;
 834        int do_not_match;
 835        regex_t *value_regex;
 836        int multi_replace;
 837        size_t offset[MAX_MATCHES];
 838        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
 839        int seen;
 840} store;
 841
 842static int matches(const char *key, const char *value)
 843{
 844        return !strcmp(key, store.key) &&
 845                (store.value_regex == NULL ||
 846                 (store.do_not_match ^
 847                  !regexec(store.value_regex, value, 0, NULL, 0)));
 848}
 849
 850static int store_aux(const char *key, const char *value, void *cb)
 851{
 852        const char *ep;
 853        size_t section_len;
 854
 855        switch (store.state) {
 856        case KEY_SEEN:
 857                if (matches(key, value)) {
 858                        if (store.seen == 1 && store.multi_replace == 0) {
 859                                warning("%s has multiple values", key);
 860                        } else if (store.seen >= MAX_MATCHES) {
 861                                error("too many matches for %s", key);
 862                                return 1;
 863                        }
 864
 865                        store.offset[store.seen] = ftell(config_file);
 866                        store.seen++;
 867                }
 868                break;
 869        case SECTION_SEEN:
 870                /*
 871                 * What we are looking for is in store.key (both
 872                 * section and var), and its section part is baselen
 873                 * long.  We found key (again, both section and var).
 874                 * We would want to know if this key is in the same
 875                 * section as what we are looking for.  We already
 876                 * know we are in the same section as what should
 877                 * hold store.key.
 878                 */
 879                ep = strrchr(key, '.');
 880                section_len = ep - key;
 881
 882                if ((section_len != store.baselen) ||
 883                    memcmp(key, store.key, section_len+1)) {
 884                        store.state = SECTION_END_SEEN;
 885                        break;
 886                }
 887
 888                /*
 889                 * Do not increment matches: this is no match, but we
 890                 * just made sure we are in the desired section.
 891                 */
 892                store.offset[store.seen] = ftell(config_file);
 893                /* fallthru */
 894        case SECTION_END_SEEN:
 895        case START:
 896                if (matches(key, value)) {
 897                        store.offset[store.seen] = ftell(config_file);
 898                        store.state = KEY_SEEN;
 899                        store.seen++;
 900                } else {
 901                        if (strrchr(key, '.') - key == store.baselen &&
 902                              !strncmp(key, store.key, store.baselen)) {
 903                                        store.state = SECTION_SEEN;
 904                                        store.offset[store.seen] = ftell(config_file);
 905                        }
 906                }
 907        }
 908        return 0;
 909}
 910
 911static int write_error(const char *filename)
 912{
 913        error("failed to write new configuration file %s", filename);
 914
 915        /* Same error code as "failed to rename". */
 916        return 4;
 917}
 918
 919static int store_write_section(int fd, const char *key)
 920{
 921        const char *dot;
 922        int i, success;
 923        struct strbuf sb = STRBUF_INIT;
 924
 925        dot = memchr(key, '.', store.baselen);
 926        if (dot) {
 927                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
 928                for (i = dot - key + 1; i < store.baselen; i++) {
 929                        if (key[i] == '"' || key[i] == '\\')
 930                                strbuf_addch(&sb, '\\');
 931                        strbuf_addch(&sb, key[i]);
 932                }
 933                strbuf_addstr(&sb, "\"]\n");
 934        } else {
 935                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
 936        }
 937
 938        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
 939        strbuf_release(&sb);
 940
 941        return success;
 942}
 943
 944static int store_write_pair(int fd, const char *key, const char *value)
 945{
 946        int i, success;
 947        int length = strlen(key + store.baselen + 1);
 948        const char *quote = "";
 949        struct strbuf sb = STRBUF_INIT;
 950
 951        /*
 952         * Check to see if the value needs to be surrounded with a dq pair.
 953         * Note that problematic characters are always backslash-quoted; this
 954         * check is about not losing leading or trailing SP and strings that
 955         * follow beginning-of-comment characters (i.e. ';' and '#') by the
 956         * configuration parser.
 957         */
 958        if (value[0] == ' ')
 959                quote = "\"";
 960        for (i = 0; value[i]; i++)
 961                if (value[i] == ';' || value[i] == '#')
 962                        quote = "\"";
 963        if (i && value[i - 1] == ' ')
 964                quote = "\"";
 965
 966        strbuf_addf(&sb, "\t%.*s = %s",
 967                    length, key + store.baselen + 1, quote);
 968
 969        for (i = 0; value[i]; i++)
 970                switch (value[i]) {
 971                case '\n':
 972                        strbuf_addstr(&sb, "\\n");
 973                        break;
 974                case '\t':
 975                        strbuf_addstr(&sb, "\\t");
 976                        break;
 977                case '"':
 978                case '\\':
 979                        strbuf_addch(&sb, '\\');
 980                default:
 981                        strbuf_addch(&sb, value[i]);
 982                        break;
 983                }
 984        strbuf_addf(&sb, "%s\n", quote);
 985
 986        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
 987        strbuf_release(&sb);
 988
 989        return success;
 990}
 991
 992static ssize_t find_beginning_of_line(const char *contents, size_t size,
 993        size_t offset_, int *found_bracket)
 994{
 995        size_t equal_offset = size, bracket_offset = size;
 996        ssize_t offset;
 997
 998contline:
 999        for (offset = offset_-2; offset > 0
1000                        && contents[offset] != '\n'; offset--)
1001                switch (contents[offset]) {
1002                        case '=': equal_offset = offset; break;
1003                        case ']': bracket_offset = offset; break;
1004                }
1005        if (offset > 0 && contents[offset-1] == '\\') {
1006                offset_ = offset;
1007                goto contline;
1008        }
1009        if (bracket_offset < equal_offset) {
1010                *found_bracket = 1;
1011                offset = bracket_offset+1;
1012        } else
1013                offset++;
1014
1015        return offset;
1016}
1017
1018int git_config_set(const char *key, const char *value)
1019{
1020        return git_config_set_multivar(key, value, NULL, 0);
1021}
1022
1023/*
1024 * If value==NULL, unset in (remove from) config,
1025 * if value_regex!=NULL, disregard key/value pairs where value does not match.
1026 * if multi_replace==0, nothing, or only one matching key/value is replaced,
1027 *     else all matching key/values (regardless how many) are removed,
1028 *     before the new pair is written.
1029 *
1030 * Returns 0 on success.
1031 *
1032 * This function does this:
1033 *
1034 * - it locks the config file by creating ".git/config.lock"
1035 *
1036 * - it then parses the config using store_aux() as validator to find
1037 *   the position on the key/value pair to replace. If it is to be unset,
1038 *   it must be found exactly once.
1039 *
1040 * - the config file is mmap()ed and the part before the match (if any) is
1041 *   written to the lock file, then the changed part and the rest.
1042 *
1043 * - the config file is removed and the lock file rename()d to it.
1044 *
1045 */
1046int git_config_set_multivar(const char *key, const char *value,
1047        const char *value_regex, int multi_replace)
1048{
1049        int i, dot;
1050        int fd = -1, in_fd;
1051        int ret;
1052        char *config_filename;
1053        struct lock_file *lock = NULL;
1054        const char *last_dot = strrchr(key, '.');
1055
1056        if (config_exclusive_filename)
1057                config_filename = xstrdup(config_exclusive_filename);
1058        else
1059                config_filename = git_pathdup("config");
1060
1061        /*
1062         * Since "key" actually contains the section name and the real
1063         * key name separated by a dot, we have to know where the dot is.
1064         */
1065
1066        if (last_dot == NULL) {
1067                error("key does not contain a section: %s", key);
1068                ret = 2;
1069                goto out_free;
1070        }
1071        store.baselen = last_dot - key;
1072
1073        store.multi_replace = multi_replace;
1074
1075        /*
1076         * Validate the key and while at it, lower case it for matching.
1077         */
1078        store.key = xmalloc(strlen(key) + 1);
1079        dot = 0;
1080        for (i = 0; key[i]; i++) {
1081                unsigned char c = key[i];
1082                if (c == '.')
1083                        dot = 1;
1084                /* Leave the extended basename untouched.. */
1085                if (!dot || i > store.baselen) {
1086                        if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
1087                                error("invalid key: %s", key);
1088                                free(store.key);
1089                                ret = 1;
1090                                goto out_free;
1091                        }
1092                        c = tolower(c);
1093                } else if (c == '\n') {
1094                        error("invalid key (newline): %s", key);
1095                        free(store.key);
1096                        ret = 1;
1097                        goto out_free;
1098                }
1099                store.key[i] = c;
1100        }
1101        store.key[i] = 0;
1102
1103        /*
1104         * The lock serves a purpose in addition to locking: the new
1105         * contents of .git/config will be written into it.
1106         */
1107        lock = xcalloc(sizeof(struct lock_file), 1);
1108        fd = hold_lock_file_for_update(lock, config_filename, 0);
1109        if (fd < 0) {
1110                error("could not lock config file %s: %s", config_filename, strerror(errno));
1111                free(store.key);
1112                ret = -1;
1113                goto out_free;
1114        }
1115
1116        /*
1117         * If .git/config does not exist yet, write a minimal version.
1118         */
1119        in_fd = open(config_filename, O_RDONLY);
1120        if ( in_fd < 0 ) {
1121                free(store.key);
1122
1123                if ( ENOENT != errno ) {
1124                        error("opening %s: %s", config_filename,
1125                              strerror(errno));
1126                        ret = 3; /* same as "invalid config file" */
1127                        goto out_free;
1128                }
1129                /* if nothing to unset, error out */
1130                if (value == NULL) {
1131                        ret = 5;
1132                        goto out_free;
1133                }
1134
1135                store.key = (char *)key;
1136                if (!store_write_section(fd, key) ||
1137                    !store_write_pair(fd, key, value))
1138                        goto write_err_out;
1139        } else {
1140                struct stat st;
1141                char *contents;
1142                size_t contents_sz, copy_begin, copy_end;
1143                int i, new_line = 0;
1144
1145                if (value_regex == NULL)
1146                        store.value_regex = NULL;
1147                else {
1148                        if (value_regex[0] == '!') {
1149                                store.do_not_match = 1;
1150                                value_regex++;
1151                        } else
1152                                store.do_not_match = 0;
1153
1154                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1155                        if (regcomp(store.value_regex, value_regex,
1156                                        REG_EXTENDED)) {
1157                                error("invalid pattern: %s", value_regex);
1158                                free(store.value_regex);
1159                                ret = 6;
1160                                goto out_free;
1161                        }
1162                }
1163
1164                store.offset[0] = 0;
1165                store.state = START;
1166                store.seen = 0;
1167
1168                /*
1169                 * After this, store.offset will contain the *end* offset
1170                 * of the last match, or remain at 0 if no match was found.
1171                 * As a side effect, we make sure to transform only a valid
1172                 * existing config file.
1173                 */
1174                if (git_config_from_file(store_aux, config_filename, NULL)) {
1175                        error("invalid config file %s", config_filename);
1176                        free(store.key);
1177                        if (store.value_regex != NULL) {
1178                                regfree(store.value_regex);
1179                                free(store.value_regex);
1180                        }
1181                        ret = 3;
1182                        goto out_free;
1183                }
1184
1185                free(store.key);
1186                if (store.value_regex != NULL) {
1187                        regfree(store.value_regex);
1188                        free(store.value_regex);
1189                }
1190
1191                /* if nothing to unset, or too many matches, error out */
1192                if ((store.seen == 0 && value == NULL) ||
1193                                (store.seen > 1 && multi_replace == 0)) {
1194                        ret = 5;
1195                        goto out_free;
1196                }
1197
1198                fstat(in_fd, &st);
1199                contents_sz = xsize_t(st.st_size);
1200                contents = xmmap(NULL, contents_sz, PROT_READ,
1201                        MAP_PRIVATE, in_fd, 0);
1202                close(in_fd);
1203
1204                if (store.seen == 0)
1205                        store.seen = 1;
1206
1207                for (i = 0, copy_begin = 0; i < store.seen; i++) {
1208                        if (store.offset[i] == 0) {
1209                                store.offset[i] = copy_end = contents_sz;
1210                        } else if (store.state != KEY_SEEN) {
1211                                copy_end = store.offset[i];
1212                        } else
1213                                copy_end = find_beginning_of_line(
1214                                        contents, contents_sz,
1215                                        store.offset[i]-2, &new_line);
1216
1217                        if (copy_end > 0 && contents[copy_end-1] != '\n')
1218                                new_line = 1;
1219
1220                        /* write the first part of the config */
1221                        if (copy_end > copy_begin) {
1222                                if (write_in_full(fd, contents + copy_begin,
1223                                                  copy_end - copy_begin) <
1224                                    copy_end - copy_begin)
1225                                        goto write_err_out;
1226                                if (new_line &&
1227                                    write_str_in_full(fd, "\n") != 1)
1228                                        goto write_err_out;
1229                        }
1230                        copy_begin = store.offset[i];
1231                }
1232
1233                /* write the pair (value == NULL means unset) */
1234                if (value != NULL) {
1235                        if (store.state == START) {
1236                                if (!store_write_section(fd, key))
1237                                        goto write_err_out;
1238                        }
1239                        if (!store_write_pair(fd, key, value))
1240                                goto write_err_out;
1241                }
1242
1243                /* write the rest of the config */
1244                if (copy_begin < contents_sz)
1245                        if (write_in_full(fd, contents + copy_begin,
1246                                          contents_sz - copy_begin) <
1247                            contents_sz - copy_begin)
1248                                goto write_err_out;
1249
1250                munmap(contents, contents_sz);
1251        }
1252
1253        if (commit_lock_file(lock) < 0) {
1254                error("could not commit config file %s", config_filename);
1255                ret = 4;
1256                goto out_free;
1257        }
1258
1259        /*
1260         * lock is committed, so don't try to roll it back below.
1261         * NOTE: Since lockfile.c keeps a linked list of all created
1262         * lock_file structures, it isn't safe to free(lock).  It's
1263         * better to just leave it hanging around.
1264         */
1265        lock = NULL;
1266        ret = 0;
1267
1268out_free:
1269        if (lock)
1270                rollback_lock_file(lock);
1271        free(config_filename);
1272        return ret;
1273
1274write_err_out:
1275        ret = write_error(lock->filename);
1276        goto out_free;
1277
1278}
1279
1280static int section_name_match (const char *buf, const char *name)
1281{
1282        int i = 0, j = 0, dot = 0;
1283        if (buf[i] != '[')
1284                return 0;
1285        for (i = 1; buf[i] && buf[i] != ']'; i++) {
1286                if (!dot && isspace(buf[i])) {
1287                        dot = 1;
1288                        if (name[j++] != '.')
1289                                break;
1290                        for (i++; isspace(buf[i]); i++)
1291                                ; /* do nothing */
1292                        if (buf[i] != '"')
1293                                break;
1294                        continue;
1295                }
1296                if (buf[i] == '\\' && dot)
1297                        i++;
1298                else if (buf[i] == '"' && dot) {
1299                        for (i++; isspace(buf[i]); i++)
1300                                ; /* do_nothing */
1301                        break;
1302                }
1303                if (buf[i] != name[j++])
1304                        break;
1305        }
1306        if (buf[i] == ']' && name[j] == 0) {
1307                /*
1308                 * We match, now just find the right length offset by
1309                 * gobbling up any whitespace after it, as well
1310                 */
1311                i++;
1312                for (; buf[i] && isspace(buf[i]); i++)
1313                        ; /* do nothing */
1314                return i;
1315        }
1316        return 0;
1317}
1318
1319/* if new_name == NULL, the section is removed instead */
1320int git_config_rename_section(const char *old_name, const char *new_name)
1321{
1322        int ret = 0, remove = 0;
1323        char *config_filename;
1324        struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1325        int out_fd;
1326        char buf[1024];
1327
1328        if (config_exclusive_filename)
1329                config_filename = xstrdup(config_exclusive_filename);
1330        else
1331                config_filename = git_pathdup("config");
1332        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1333        if (out_fd < 0) {
1334                ret = error("could not lock config file %s", config_filename);
1335                goto out;
1336        }
1337
1338        if (!(config_file = fopen(config_filename, "rb"))) {
1339                /* no config file means nothing to rename, no error */
1340                goto unlock_and_out;
1341        }
1342
1343        while (fgets(buf, sizeof(buf), config_file)) {
1344                int i;
1345                int length;
1346                char *output = buf;
1347                for (i = 0; buf[i] && isspace(buf[i]); i++)
1348                        ; /* do nothing */
1349                if (buf[i] == '[') {
1350                        /* it's a section */
1351                        int offset = section_name_match(&buf[i], old_name);
1352                        if (offset > 0) {
1353                                ret++;
1354                                if (new_name == NULL) {
1355                                        remove = 1;
1356                                        continue;
1357                                }
1358                                store.baselen = strlen(new_name);
1359                                if (!store_write_section(out_fd, new_name)) {
1360                                        ret = write_error(lock->filename);
1361                                        goto out;
1362                                }
1363                                /*
1364                                 * We wrote out the new section, with
1365                                 * a newline, now skip the old
1366                                 * section's length
1367                                 */
1368                                output += offset + i;
1369                                if (strlen(output) > 0) {
1370                                        /*
1371                                         * More content means there's
1372                                         * a declaration to put on the
1373                                         * next line; indent with a
1374                                         * tab
1375                                         */
1376                                        output -= 1;
1377                                        output[0] = '\t';
1378                                }
1379                        }
1380                        remove = 0;
1381                }
1382                if (remove)
1383                        continue;
1384                length = strlen(output);
1385                if (write_in_full(out_fd, output, length) != length) {
1386                        ret = write_error(lock->filename);
1387                        goto out;
1388                }
1389        }
1390        fclose(config_file);
1391 unlock_and_out:
1392        if (commit_lock_file(lock) < 0)
1393                ret = error("could not commit config file %s", config_filename);
1394 out:
1395        free(config_filename);
1396        return ret;
1397}
1398
1399/*
1400 * Call this to report error for your variable that should not
1401 * get a boolean value (i.e. "[my] var" means "true").
1402 */
1403int config_error_nonbool(const char *var)
1404{
1405        return error("Missing value for '%s'", var);
1406}