Andrew's git / gitweb.git / config.c
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config.con commit unpack-trees: handle lstat failure for existing file (a93e530)
   1/*
   2 * GIT - The information manager from hell
   3 *
   4 * Copyright (C) Linus Torvalds, 2005
   5 * Copyright (C) Johannes Schindelin, 2005
   6 *
   7 */
   8#include "cache.h"
   9#include "exec_cmd.h"
  10#include "strbuf.h"
  11#include "quote.h"
  12
  13#define MAXNAME (256)
  14
  15static FILE *config_file;
  16static const char *config_file_name;
  17static int config_linenr;
  18static int config_file_eof;
  19static int zlib_compression_seen;
  20
  21const char *config_exclusive_filename = NULL;
  22
  23struct config_item
  24{
  25        struct config_item *next;
  26        char *name;
  27        char *value;
  28};
  29static struct config_item *config_parameters;
  30static struct config_item **config_parameters_tail = &config_parameters;
  31
  32static void lowercase(char *p)
  33{
  34        for (; *p; p++)
  35                *p = tolower(*p);
  36}
  37
  38void git_config_push_parameter(const char *text)
  39{
  40        struct strbuf env = STRBUF_INIT;
  41        const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
  42        if (old) {
  43                strbuf_addstr(&env, old);
  44                strbuf_addch(&env, ' ');
  45        }
  46        sq_quote_buf(&env, text);
  47        setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
  48        strbuf_release(&env);
  49}
  50
  51int git_config_parse_parameter(const char *text)
  52{
  53        struct config_item *ct;
  54        struct strbuf tmp = STRBUF_INIT;
  55        struct strbuf **pair;
  56        strbuf_addstr(&tmp, text);
  57        pair = strbuf_split(&tmp, '=');
  58        if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=')
  59                strbuf_setlen(pair[0], pair[0]->len - 1);
  60        strbuf_trim(pair[0]);
  61        if (!pair[0]->len) {
  62                strbuf_list_free(pair);
  63                return -1;
  64        }
  65        ct = xcalloc(1, sizeof(struct config_item));
  66        ct->name = strbuf_detach(pair[0], NULL);
  67        if (pair[1]) {
  68                strbuf_trim(pair[1]);
  69                ct->value = strbuf_detach(pair[1], NULL);
  70        }
  71        strbuf_list_free(pair);
  72        lowercase(ct->name);
  73        *config_parameters_tail = ct;
  74        config_parameters_tail = &ct->next;
  75        return 0;
  76}
  77
  78int git_config_parse_environment(void) {
  79        const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
  80        char *envw;
  81        const char **argv = NULL;
  82        int nr = 0, alloc = 0;
  83        int i;
  84
  85        if (!env)
  86                return 0;
  87        /* sq_dequote will write over it */
  88        envw = xstrdup(env);
  89
  90        if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
  91                free(envw);
  92                return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
  93        }
  94
  95        for (i = 0; i < nr; i++) {
  96                if (git_config_parse_parameter(argv[i]) < 0) {
  97                        error("bogus config parameter: %s", argv[i]);
  98                        free(argv);
  99                        free(envw);
 100                        return -1;
 101                }
 102        }
 103
 104        free(argv);
 105        free(envw);
 106        return 0;
 107}
 108
 109static int get_next_char(void)
 110{
 111        int c;
 112        FILE *f;
 113
 114        c = '\n';
 115        if ((f = config_file) != NULL) {
 116                c = fgetc(f);
 117                if (c == '\r') {
 118                        /* DOS like systems */
 119                        c = fgetc(f);
 120                        if (c != '\n') {
 121                                ungetc(c, f);
 122                                c = '\r';
 123                        }
 124                }
 125                if (c == '\n')
 126                        config_linenr++;
 127                if (c == EOF) {
 128                        config_file_eof = 1;
 129                        c = '\n';
 130                }
 131        }
 132        return c;
 133}
 134
 135static char *parse_value(void)
 136{
 137        static char value[1024];
 138        int quote = 0, comment = 0, len = 0, space = 0;
 139
 140        for (;;) {
 141                int c = get_next_char();
 142                if (len >= sizeof(value) - 1)
 143                        return NULL;
 144                if (c == '\n') {
 145                        if (quote)
 146                                return NULL;
 147                        value[len] = 0;
 148                        return value;
 149                }
 150                if (comment)
 151                        continue;
 152                if (isspace(c) && !quote) {
 153                        if (len)
 154                                space++;
 155                        continue;
 156                }
 157                if (!quote) {
 158                        if (c == ';' || c == '#') {
 159                                comment = 1;
 160                                continue;
 161                        }
 162                }
 163                for (; space; space--)
 164                        value[len++] = ' ';
 165                if (c == '\\') {
 166                        c = get_next_char();
 167                        switch (c) {
 168                        case '\n':
 169                                continue;
 170                        case 't':
 171                                c = '\t';
 172                                break;
 173                        case 'b':
 174                                c = '\b';
 175                                break;
 176                        case 'n':
 177                                c = '\n';
 178                                break;
 179                        /* Some characters escape as themselves */
 180                        case '\\': case '"':
 181                                break;
 182                        /* Reject unknown escape sequences */
 183                        default:
 184                                return NULL;
 185                        }
 186                        value[len++] = c;
 187                        continue;
 188                }
 189                if (c == '"') {
 190                        quote = 1-quote;
 191                        continue;
 192                }
 193                value[len++] = c;
 194        }
 195}
 196
 197static inline int iskeychar(int c)
 198{
 199        return isalnum(c) || c == '-';
 200}
 201
 202static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)
 203{
 204        int c;
 205        char *value;
 206
 207        /* Get the full name */
 208        for (;;) {
 209                c = get_next_char();
 210                if (config_file_eof)
 211                        break;
 212                if (!iskeychar(c))
 213                        break;
 214                name[len++] = tolower(c);
 215                if (len >= MAXNAME)
 216                        return -1;
 217        }
 218        name[len] = 0;
 219        while (c == ' ' || c == '\t')
 220                c = get_next_char();
 221
 222        value = NULL;
 223        if (c != '\n') {
 224                if (c != '=')
 225                        return -1;
 226                value = parse_value();
 227                if (!value)
 228                        return -1;
 229        }
 230        return fn(name, value, data);
 231}
 232
 233static int get_extended_base_var(char *name, int baselen, int c)
 234{
 235        do {
 236                if (c == '\n')
 237                        return -1;
 238                c = get_next_char();
 239        } while (isspace(c));
 240
 241        /* We require the format to be '[base "extension"]' */
 242        if (c != '"')
 243                return -1;
 244        name[baselen++] = '.';
 245
 246        for (;;) {
 247                int c = get_next_char();
 248                if (c == '\n')
 249                        return -1;
 250                if (c == '"')
 251                        break;
 252                if (c == '\\') {
 253                        c = get_next_char();
 254                        if (c == '\n')
 255                                return -1;
 256                }
 257                name[baselen++] = c;
 258                if (baselen > MAXNAME / 2)
 259                        return -1;
 260        }
 261
 262        /* Final ']' */
 263        if (get_next_char() != ']')
 264                return -1;
 265        return baselen;
 266}
 267
 268static int get_base_var(char *name)
 269{
 270        int baselen = 0;
 271
 272        for (;;) {
 273                int c = get_next_char();
 274                if (config_file_eof)
 275                        return -1;
 276                if (c == ']')
 277                        return baselen;
 278                if (isspace(c))
 279                        return get_extended_base_var(name, baselen, c);
 280                if (!iskeychar(c) && c != '.')
 281                        return -1;
 282                if (baselen > MAXNAME / 2)
 283                        return -1;
 284                name[baselen++] = tolower(c);
 285        }
 286}
 287
 288static int git_parse_file(config_fn_t fn, void *data)
 289{
 290        int comment = 0;
 291        int baselen = 0;
 292        static char var[MAXNAME];
 293
 294        /* U+FEFF Byte Order Mark in UTF8 */
 295        static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
 296        const unsigned char *bomptr = utf8_bom;
 297
 298        for (;;) {
 299                int c = get_next_char();
 300                if (bomptr && *bomptr) {
 301                        /* We are at the file beginning; skip UTF8-encoded BOM
 302                         * if present. Sane editors won't put this in on their
 303                         * own, but e.g. Windows Notepad will do it happily. */
 304                        if ((unsigned char) c == *bomptr) {
 305                                bomptr++;
 306                                continue;
 307                        } else {
 308                                /* Do not tolerate partial BOM. */
 309                                if (bomptr != utf8_bom)
 310                                        break;
 311                                /* No BOM at file beginning. Cool. */
 312                                bomptr = NULL;
 313                        }
 314                }
 315                if (c == '\n') {
 316                        if (config_file_eof)
 317                                return 0;
 318                        comment = 0;
 319                        continue;
 320                }
 321                if (comment || isspace(c))
 322                        continue;
 323                if (c == '#' || c == ';') {
 324                        comment = 1;
 325                        continue;
 326                }
 327                if (c == '[') {
 328                        baselen = get_base_var(var);
 329                        if (baselen <= 0)
 330                                break;
 331                        var[baselen++] = '.';
 332                        var[baselen] = 0;
 333                        continue;
 334                }
 335                if (!isalpha(c))
 336                        break;
 337                var[baselen] = tolower(c);
 338                if (get_value(fn, data, var, baselen+1) < 0)
 339                        break;
 340        }
 341        die("bad config file line %d in %s", config_linenr, config_file_name);
 342}
 343
 344static int parse_unit_factor(const char *end, unsigned long *val)
 345{
 346        if (!*end)
 347                return 1;
 348        else if (!strcasecmp(end, "k")) {
 349                *val *= 1024;
 350                return 1;
 351        }
 352        else if (!strcasecmp(end, "m")) {
 353                *val *= 1024 * 1024;
 354                return 1;
 355        }
 356        else if (!strcasecmp(end, "g")) {
 357                *val *= 1024 * 1024 * 1024;
 358                return 1;
 359        }
 360        return 0;
 361}
 362
 363static int git_parse_long(const char *value, long *ret)
 364{
 365        if (value && *value) {
 366                char *end;
 367                long val = strtol(value, &end, 0);
 368                unsigned long factor = 1;
 369                if (!parse_unit_factor(end, &factor))
 370                        return 0;
 371                *ret = val * factor;
 372                return 1;
 373        }
 374        return 0;
 375}
 376
 377int git_parse_ulong(const char *value, unsigned long *ret)
 378{
 379        if (value && *value) {
 380                char *end;
 381                unsigned long val = strtoul(value, &end, 0);
 382                if (!parse_unit_factor(end, &val))
 383                        return 0;
 384                *ret = val;
 385                return 1;
 386        }
 387        return 0;
 388}
 389
 390static void die_bad_config(const char *name)
 391{
 392        if (config_file_name)
 393                die("bad config value for '%s' in %s", name, config_file_name);
 394        die("bad config value for '%s'", name);
 395}
 396
 397int git_config_int(const char *name, const char *value)
 398{
 399        long ret = 0;
 400        if (!git_parse_long(value, &ret))
 401                die_bad_config(name);
 402        return ret;
 403}
 404
 405unsigned long git_config_ulong(const char *name, const char *value)
 406{
 407        unsigned long ret;
 408        if (!git_parse_ulong(value, &ret))
 409                die_bad_config(name);
 410        return ret;
 411}
 412
 413static int git_config_maybe_bool_text(const char *name, const char *value)
 414{
 415        if (!value)
 416                return 1;
 417        if (!*value)
 418                return 0;
 419        if (!strcasecmp(value, "true")
 420            || !strcasecmp(value, "yes")
 421            || !strcasecmp(value, "on"))
 422                return 1;
 423        if (!strcasecmp(value, "false")
 424            || !strcasecmp(value, "no")
 425            || !strcasecmp(value, "off"))
 426                return 0;
 427        return -1;
 428}
 429
 430int git_config_maybe_bool(const char *name, const char *value)
 431{
 432        int v = git_config_maybe_bool_text(name, value);
 433        if (0 <= v)
 434                return v;
 435        if (!strcmp(value, "0"))
 436                return 0;
 437        if (!strcmp(value, "1"))
 438                return 1;
 439        return -1;
 440}
 441
 442int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 443{
 444        int v = git_config_maybe_bool_text(name, value);
 445        if (0 <= v) {
 446                *is_bool = 1;
 447                return v;
 448        }
 449        *is_bool = 0;
 450        return git_config_int(name, value);
 451}
 452
 453int git_config_bool(const char *name, const char *value)
 454{
 455        int discard;
 456        return !!git_config_bool_or_int(name, value, &discard);
 457}
 458
 459int git_config_string(const char **dest, const char *var, const char *value)
 460{
 461        if (!value)
 462                return config_error_nonbool(var);
 463        *dest = xstrdup(value);
 464        return 0;
 465}
 466
 467int git_config_pathname(const char **dest, const char *var, const char *value)
 468{
 469        if (!value)
 470                return config_error_nonbool(var);
 471        *dest = expand_user_path(value);
 472        if (!*dest)
 473                die("Failed to expand user dir in: '%s'", value);
 474        return 0;
 475}
 476
 477static int git_default_core_config(const char *var, const char *value)
 478{
 479        /* This needs a better name */
 480        if (!strcmp(var, "core.filemode")) {
 481                trust_executable_bit = git_config_bool(var, value);
 482                return 0;
 483        }
 484        if (!strcmp(var, "core.trustctime")) {
 485                trust_ctime = git_config_bool(var, value);
 486                return 0;
 487        }
 488
 489        if (!strcmp(var, "core.quotepath")) {
 490                quote_path_fully = git_config_bool(var, value);
 491                return 0;
 492        }
 493
 494        if (!strcmp(var, "core.symlinks")) {
 495                has_symlinks = git_config_bool(var, value);
 496                return 0;
 497        }
 498
 499        if (!strcmp(var, "core.ignorecase")) {
 500                ignore_case = git_config_bool(var, value);
 501                return 0;
 502        }
 503
 504        if (!strcmp(var, "core.bare")) {
 505                is_bare_repository_cfg = git_config_bool(var, value);
 506                return 0;
 507        }
 508
 509        if (!strcmp(var, "core.ignorestat")) {
 510                assume_unchanged = git_config_bool(var, value);
 511                return 0;
 512        }
 513
 514        if (!strcmp(var, "core.prefersymlinkrefs")) {
 515                prefer_symlink_refs = git_config_bool(var, value);
 516                return 0;
 517        }
 518
 519        if (!strcmp(var, "core.logallrefupdates")) {
 520                log_all_ref_updates = git_config_bool(var, value);
 521                return 0;
 522        }
 523
 524        if (!strcmp(var, "core.warnambiguousrefs")) {
 525                warn_ambiguous_refs = git_config_bool(var, value);
 526                return 0;
 527        }
 528
 529        if (!strcmp(var, "core.loosecompression")) {
 530                int level = git_config_int(var, value);
 531                if (level == -1)
 532                        level = Z_DEFAULT_COMPRESSION;
 533                else if (level < 0 || level > Z_BEST_COMPRESSION)
 534                        die("bad zlib compression level %d", level);
 535                zlib_compression_level = level;
 536                zlib_compression_seen = 1;
 537                return 0;
 538        }
 539
 540        if (!strcmp(var, "core.compression")) {
 541                int level = git_config_int(var, value);
 542                if (level == -1)
 543                        level = Z_DEFAULT_COMPRESSION;
 544                else if (level < 0 || level > Z_BEST_COMPRESSION)
 545                        die("bad zlib compression level %d", level);
 546                core_compression_level = level;
 547                core_compression_seen = 1;
 548                if (!zlib_compression_seen)
 549                        zlib_compression_level = level;
 550                return 0;
 551        }
 552
 553        if (!strcmp(var, "core.packedgitwindowsize")) {
 554                int pgsz_x2 = getpagesize() * 2;
 555                packed_git_window_size = git_config_int(var, value);
 556
 557                /* This value must be multiple of (pagesize * 2) */
 558                packed_git_window_size /= pgsz_x2;
 559                if (packed_git_window_size < 1)
 560                        packed_git_window_size = 1;
 561                packed_git_window_size *= pgsz_x2;
 562                return 0;
 563        }
 564
 565        if (!strcmp(var, "core.packedgitlimit")) {
 566                packed_git_limit = git_config_int(var, value);
 567                return 0;
 568        }
 569
 570        if (!strcmp(var, "core.deltabasecachelimit")) {
 571                delta_base_cache_limit = git_config_int(var, value);
 572                return 0;
 573        }
 574
 575        if (!strcmp(var, "core.autocrlf")) {
 576                if (value && !strcasecmp(value, "input")) {
 577                        if (eol == EOL_CRLF)
 578                                return error("core.autocrlf=input conflicts with core.eol=crlf");
 579                        auto_crlf = AUTO_CRLF_INPUT;
 580                        return 0;
 581                }
 582                auto_crlf = git_config_bool(var, value);
 583                return 0;
 584        }
 585
 586        if (!strcmp(var, "core.safecrlf")) {
 587                if (value && !strcasecmp(value, "warn")) {
 588                        safe_crlf = SAFE_CRLF_WARN;
 589                        return 0;
 590                }
 591                safe_crlf = git_config_bool(var, value);
 592                return 0;
 593        }
 594
 595        if (!strcmp(var, "core.eol")) {
 596                if (value && !strcasecmp(value, "lf"))
 597                        eol = EOL_LF;
 598                else if (value && !strcasecmp(value, "crlf"))
 599                        eol = EOL_CRLF;
 600                else if (value && !strcasecmp(value, "native"))
 601                        eol = EOL_NATIVE;
 602                else
 603                        eol = EOL_UNSET;
 604                if (eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 605                        return error("core.autocrlf=input conflicts with core.eol=crlf");
 606                return 0;
 607        }
 608
 609        if (!strcmp(var, "core.notesref")) {
 610                notes_ref_name = xstrdup(value);
 611                return 0;
 612        }
 613
 614        if (!strcmp(var, "core.pager"))
 615                return git_config_string(&pager_program, var, value);
 616
 617        if (!strcmp(var, "core.editor"))
 618                return git_config_string(&editor_program, var, value);
 619
 620        if (!strcmp(var, "core.askpass"))
 621                return git_config_string(&askpass_program, var, value);
 622
 623        if (!strcmp(var, "core.excludesfile"))
 624                return git_config_pathname(&excludes_file, var, value);
 625
 626        if (!strcmp(var, "core.whitespace")) {
 627                if (!value)
 628                        return config_error_nonbool(var);
 629                whitespace_rule_cfg = parse_whitespace_rule(value);
 630                return 0;
 631        }
 632
 633        if (!strcmp(var, "core.fsyncobjectfiles")) {
 634                fsync_object_files = git_config_bool(var, value);
 635                return 0;
 636        }
 637
 638        if (!strcmp(var, "core.preloadindex")) {
 639                core_preload_index = git_config_bool(var, value);
 640                return 0;
 641        }
 642
 643        if (!strcmp(var, "core.createobject")) {
 644                if (!strcmp(value, "rename"))
 645                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 646                else if (!strcmp(value, "link"))
 647                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 648                else
 649                        die("Invalid mode for object creation: %s", value);
 650                return 0;
 651        }
 652
 653        if (!strcmp(var, "core.sparsecheckout")) {
 654                core_apply_sparse_checkout = git_config_bool(var, value);
 655                return 0;
 656        }
 657
 658        /* Add other config variables here and to Documentation/config.txt. */
 659        return 0;
 660}
 661
 662static int git_default_user_config(const char *var, const char *value)
 663{
 664        if (!strcmp(var, "user.name")) {
 665                if (!value)
 666                        return config_error_nonbool(var);
 667                strlcpy(git_default_name, value, sizeof(git_default_name));
 668                user_ident_explicitly_given |= IDENT_NAME_GIVEN;
 669                return 0;
 670        }
 671
 672        if (!strcmp(var, "user.email")) {
 673                if (!value)
 674                        return config_error_nonbool(var);
 675                strlcpy(git_default_email, value, sizeof(git_default_email));
 676                user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 677                return 0;
 678        }
 679
 680        /* Add other config variables here and to Documentation/config.txt. */
 681        return 0;
 682}
 683
 684static int git_default_i18n_config(const char *var, const char *value)
 685{
 686        if (!strcmp(var, "i18n.commitencoding"))
 687                return git_config_string(&git_commit_encoding, var, value);
 688
 689        if (!strcmp(var, "i18n.logoutputencoding"))
 690                return git_config_string(&git_log_output_encoding, var, value);
 691
 692        /* Add other config variables here and to Documentation/config.txt. */
 693        return 0;
 694}
 695
 696static int git_default_branch_config(const char *var, const char *value)
 697{
 698        if (!strcmp(var, "branch.autosetupmerge")) {
 699                if (value && !strcasecmp(value, "always")) {
 700                        git_branch_track = BRANCH_TRACK_ALWAYS;
 701                        return 0;
 702                }
 703                git_branch_track = git_config_bool(var, value);
 704                return 0;
 705        }
 706        if (!strcmp(var, "branch.autosetuprebase")) {
 707                if (!value)
 708                        return config_error_nonbool(var);
 709                else if (!strcmp(value, "never"))
 710                        autorebase = AUTOREBASE_NEVER;
 711                else if (!strcmp(value, "local"))
 712                        autorebase = AUTOREBASE_LOCAL;
 713                else if (!strcmp(value, "remote"))
 714                        autorebase = AUTOREBASE_REMOTE;
 715                else if (!strcmp(value, "always"))
 716                        autorebase = AUTOREBASE_ALWAYS;
 717                else
 718                        return error("Malformed value for %s", var);
 719                return 0;
 720        }
 721
 722        /* Add other config variables here and to Documentation/config.txt. */
 723        return 0;
 724}
 725
 726static int git_default_push_config(const char *var, const char *value)
 727{
 728        if (!strcmp(var, "push.default")) {
 729                if (!value)
 730                        return config_error_nonbool(var);
 731                else if (!strcmp(value, "nothing"))
 732                        push_default = PUSH_DEFAULT_NOTHING;
 733                else if (!strcmp(value, "matching"))
 734                        push_default = PUSH_DEFAULT_MATCHING;
 735                else if (!strcmp(value, "tracking"))
 736                        push_default = PUSH_DEFAULT_TRACKING;
 737                else if (!strcmp(value, "current"))
 738                        push_default = PUSH_DEFAULT_CURRENT;
 739                else {
 740                        error("Malformed value for %s: %s", var, value);
 741                        return error("Must be one of nothing, matching, "
 742                                     "tracking or current.");
 743                }
 744                return 0;
 745        }
 746
 747        /* Add other config variables here and to Documentation/config.txt. */
 748        return 0;
 749}
 750
 751static int git_default_mailmap_config(const char *var, const char *value)
 752{
 753        if (!strcmp(var, "mailmap.file"))
 754                return git_config_string(&git_mailmap_file, var, value);
 755
 756        /* Add other config variables here and to Documentation/config.txt. */
 757        return 0;
 758}
 759
 760int git_default_config(const char *var, const char *value, void *dummy)
 761{
 762        if (!prefixcmp(var, "core."))
 763                return git_default_core_config(var, value);
 764
 765        if (!prefixcmp(var, "user."))
 766                return git_default_user_config(var, value);
 767
 768        if (!prefixcmp(var, "i18n."))
 769                return git_default_i18n_config(var, value);
 770
 771        if (!prefixcmp(var, "branch."))
 772                return git_default_branch_config(var, value);
 773
 774        if (!prefixcmp(var, "push."))
 775                return git_default_push_config(var, value);
 776
 777        if (!prefixcmp(var, "mailmap."))
 778                return git_default_mailmap_config(var, value);
 779
 780        if (!prefixcmp(var, "advice."))
 781                return git_default_advice_config(var, value);
 782
 783        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 784                pager_use_color = git_config_bool(var,value);
 785                return 0;
 786        }
 787
 788        /* Add other config variables here and to Documentation/config.txt. */
 789        return 0;
 790}
 791
 792int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 793{
 794        int ret;
 795        FILE *f = fopen(filename, "r");
 796
 797        ret = -1;
 798        if (f) {
 799                config_file = f;
 800                config_file_name = filename;
 801                config_linenr = 1;
 802                config_file_eof = 0;
 803                ret = git_parse_file(fn, data);
 804                fclose(f);
 805                config_file_name = NULL;
 806        }
 807        return ret;
 808}
 809
 810const char *git_etc_gitconfig(void)
 811{
 812        static const char *system_wide;
 813        if (!system_wide)
 814                system_wide = system_path(ETC_GITCONFIG);
 815        return system_wide;
 816}
 817
 818int git_env_bool(const char *k, int def)
 819{
 820        const char *v = getenv(k);
 821        return v ? git_config_bool(k, v) : def;
 822}
 823
 824int git_config_system(void)
 825{
 826        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 827}
 828
 829int git_config_global(void)
 830{
 831        return !git_env_bool("GIT_CONFIG_NOGLOBAL", 0);
 832}
 833
 834int git_config_from_parameters(config_fn_t fn, void *data)
 835{
 836        static int loaded_environment;
 837        const struct config_item *ct;
 838
 839        if (!loaded_environment) {
 840                if (git_config_parse_environment() < 0)
 841                        return -1;
 842                loaded_environment = 1;
 843        }
 844        for (ct = config_parameters; ct; ct = ct->next)
 845                if (fn(ct->name, ct->value, data) < 0)
 846                        return -1;
 847        return 0;
 848}
 849
 850int git_config(config_fn_t fn, void *data)
 851{
 852        int ret = 0, found = 0;
 853        char *repo_config = NULL;
 854        const char *home = NULL;
 855
 856        /* Setting $GIT_CONFIG makes git read _only_ the given config file. */
 857        if (config_exclusive_filename)
 858                return git_config_from_file(fn, config_exclusive_filename, data);
 859        if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
 860                ret += git_config_from_file(fn, git_etc_gitconfig(),
 861                                            data);
 862                found += 1;
 863        }
 864
 865        home = getenv("HOME");
 866        if (git_config_global() && home) {
 867                char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
 868                if (!access(user_config, R_OK)) {
 869                        ret += git_config_from_file(fn, user_config, data);
 870                        found += 1;
 871                }
 872                free(user_config);
 873        }
 874
 875        repo_config = git_pathdup("config");
 876        if (!access(repo_config, R_OK)) {
 877                ret += git_config_from_file(fn, repo_config, data);
 878                found += 1;
 879        }
 880        free(repo_config);
 881
 882        ret += git_config_from_parameters(fn, data);
 883        if (config_parameters)
 884                found += 1;
 885
 886        if (found == 0)
 887                return -1;
 888        return ret;
 889}
 890
 891/*
 892 * Find all the stuff for git_config_set() below.
 893 */
 894
 895#define MAX_MATCHES 512
 896
 897static struct {
 898        int baselen;
 899        char *key;
 900        int do_not_match;
 901        regex_t *value_regex;
 902        int multi_replace;
 903        size_t offset[MAX_MATCHES];
 904        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
 905        int seen;
 906} store;
 907
 908static int matches(const char *key, const char *value)
 909{
 910        return !strcmp(key, store.key) &&
 911                (store.value_regex == NULL ||
 912                 (store.do_not_match ^
 913                  !regexec(store.value_regex, value, 0, NULL, 0)));
 914}
 915
 916static int store_aux(const char *key, const char *value, void *cb)
 917{
 918        const char *ep;
 919        size_t section_len;
 920
 921        switch (store.state) {
 922        case KEY_SEEN:
 923                if (matches(key, value)) {
 924                        if (store.seen == 1 && store.multi_replace == 0) {
 925                                warning("%s has multiple values", key);
 926                        } else if (store.seen >= MAX_MATCHES) {
 927                                error("too many matches for %s", key);
 928                                return 1;
 929                        }
 930
 931                        store.offset[store.seen] = ftell(config_file);
 932                        store.seen++;
 933                }
 934                break;
 935        case SECTION_SEEN:
 936                /*
 937                 * What we are looking for is in store.key (both
 938                 * section and var), and its section part is baselen
 939                 * long.  We found key (again, both section and var).
 940                 * We would want to know if this key is in the same
 941                 * section as what we are looking for.  We already
 942                 * know we are in the same section as what should
 943                 * hold store.key.
 944                 */
 945                ep = strrchr(key, '.');
 946                section_len = ep - key;
 947
 948                if ((section_len != store.baselen) ||
 949                    memcmp(key, store.key, section_len+1)) {
 950                        store.state = SECTION_END_SEEN;
 951                        break;
 952                }
 953
 954                /*
 955                 * Do not increment matches: this is no match, but we
 956                 * just made sure we are in the desired section.
 957                 */
 958                store.offset[store.seen] = ftell(config_file);
 959                /* fallthru */
 960        case SECTION_END_SEEN:
 961        case START:
 962                if (matches(key, value)) {
 963                        store.offset[store.seen] = ftell(config_file);
 964                        store.state = KEY_SEEN;
 965                        store.seen++;
 966                } else {
 967                        if (strrchr(key, '.') - key == store.baselen &&
 968                              !strncmp(key, store.key, store.baselen)) {
 969                                        store.state = SECTION_SEEN;
 970                                        store.offset[store.seen] = ftell(config_file);
 971                        }
 972                }
 973        }
 974        return 0;
 975}
 976
 977static int write_error(const char *filename)
 978{
 979        error("failed to write new configuration file %s", filename);
 980
 981        /* Same error code as "failed to rename". */
 982        return 4;
 983}
 984
 985static int store_write_section(int fd, const char *key)
 986{
 987        const char *dot;
 988        int i, success;
 989        struct strbuf sb = STRBUF_INIT;
 990
 991        dot = memchr(key, '.', store.baselen);
 992        if (dot) {
 993                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
 994                for (i = dot - key + 1; i < store.baselen; i++) {
 995                        if (key[i] == '"' || key[i] == '\\')
 996                                strbuf_addch(&sb, '\\');
 997                        strbuf_addch(&sb, key[i]);
 998                }
 999                strbuf_addstr(&sb, "\"]\n");
1000        } else {
1001                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1002        }
1003
1004        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1005        strbuf_release(&sb);
1006
1007        return success;
1008}
1009
1010static int store_write_pair(int fd, const char *key, const char *value)
1011{
1012        int i, success;
1013        int length = strlen(key + store.baselen + 1);
1014        const char *quote = "";
1015        struct strbuf sb = STRBUF_INIT;
1016
1017        /*
1018         * Check to see if the value needs to be surrounded with a dq pair.
1019         * Note that problematic characters are always backslash-quoted; this
1020         * check is about not losing leading or trailing SP and strings that
1021         * follow beginning-of-comment characters (i.e. ';' and '#') by the
1022         * configuration parser.
1023         */
1024        if (value[0] == ' ')
1025                quote = "\"";
1026        for (i = 0; value[i]; i++)
1027                if (value[i] == ';' || value[i] == '#')
1028                        quote = "\"";
1029        if (i && value[i - 1] == ' ')
1030                quote = "\"";
1031
1032        strbuf_addf(&sb, "\t%.*s = %s",
1033                    length, key + store.baselen + 1, quote);
1034
1035        for (i = 0; value[i]; i++)
1036                switch (value[i]) {
1037                case '\n':
1038                        strbuf_addstr(&sb, "\\n");
1039                        break;
1040                case '\t':
1041                        strbuf_addstr(&sb, "\\t");
1042                        break;
1043                case '"':
1044                case '\\':
1045                        strbuf_addch(&sb, '\\');
1046                default:
1047                        strbuf_addch(&sb, value[i]);
1048                        break;
1049                }
1050        strbuf_addf(&sb, "%s\n", quote);
1051
1052        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1053        strbuf_release(&sb);
1054
1055        return success;
1056}
1057
1058static ssize_t find_beginning_of_line(const char *contents, size_t size,
1059        size_t offset_, int *found_bracket)
1060{
1061        size_t equal_offset = size, bracket_offset = size;
1062        ssize_t offset;
1063
1064contline:
1065        for (offset = offset_-2; offset > 0
1066                        && contents[offset] != '\n'; offset--)
1067                switch (contents[offset]) {
1068                        case '=': equal_offset = offset; break;
1069                        case ']': bracket_offset = offset; break;
1070                }
1071        if (offset > 0 && contents[offset-1] == '\\') {
1072                offset_ = offset;
1073                goto contline;
1074        }
1075        if (bracket_offset < equal_offset) {
1076                *found_bracket = 1;
1077                offset = bracket_offset+1;
1078        } else
1079                offset++;
1080
1081        return offset;
1082}
1083
1084int git_config_set(const char *key, const char *value)
1085{
1086        return git_config_set_multivar(key, value, NULL, 0);
1087}
1088
1089/*
1090 * If value==NULL, unset in (remove from) config,
1091 * if value_regex!=NULL, disregard key/value pairs where value does not match.
1092 * if multi_replace==0, nothing, or only one matching key/value is replaced,
1093 *     else all matching key/values (regardless how many) are removed,
1094 *     before the new pair is written.
1095 *
1096 * Returns 0 on success.
1097 *
1098 * This function does this:
1099 *
1100 * - it locks the config file by creating ".git/config.lock"
1101 *
1102 * - it then parses the config using store_aux() as validator to find
1103 *   the position on the key/value pair to replace. If it is to be unset,
1104 *   it must be found exactly once.
1105 *
1106 * - the config file is mmap()ed and the part before the match (if any) is
1107 *   written to the lock file, then the changed part and the rest.
1108 *
1109 * - the config file is removed and the lock file rename()d to it.
1110 *
1111 */
1112int git_config_set_multivar(const char *key, const char *value,
1113        const char *value_regex, int multi_replace)
1114{
1115        int i, dot;
1116        int fd = -1, in_fd;
1117        int ret;
1118        char *config_filename;
1119        struct lock_file *lock = NULL;
1120        const char *last_dot = strrchr(key, '.');
1121
1122        if (config_exclusive_filename)
1123                config_filename = xstrdup(config_exclusive_filename);
1124        else
1125                config_filename = git_pathdup("config");
1126
1127        /*
1128         * Since "key" actually contains the section name and the real
1129         * key name separated by a dot, we have to know where the dot is.
1130         */
1131
1132        if (last_dot == NULL) {
1133                error("key does not contain a section: %s", key);
1134                ret = 2;
1135                goto out_free;
1136        }
1137        store.baselen = last_dot - key;
1138
1139        store.multi_replace = multi_replace;
1140
1141        /*
1142         * Validate the key and while at it, lower case it for matching.
1143         */
1144        store.key = xmalloc(strlen(key) + 1);
1145        dot = 0;
1146        for (i = 0; key[i]; i++) {
1147                unsigned char c = key[i];
1148                if (c == '.')
1149                        dot = 1;
1150                /* Leave the extended basename untouched.. */
1151                if (!dot || i > store.baselen) {
1152                        if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
1153                                error("invalid key: %s", key);
1154                                free(store.key);
1155                                ret = 1;
1156                                goto out_free;
1157                        }
1158                        c = tolower(c);
1159                } else if (c == '\n') {
1160                        error("invalid key (newline): %s", key);
1161                        free(store.key);
1162                        ret = 1;
1163                        goto out_free;
1164                }
1165                store.key[i] = c;
1166        }
1167        store.key[i] = 0;
1168
1169        /*
1170         * The lock serves a purpose in addition to locking: the new
1171         * contents of .git/config will be written into it.
1172         */
1173        lock = xcalloc(sizeof(struct lock_file), 1);
1174        fd = hold_lock_file_for_update(lock, config_filename, 0);
1175        if (fd < 0) {
1176                error("could not lock config file %s: %s", config_filename, strerror(errno));
1177                free(store.key);
1178                ret = -1;
1179                goto out_free;
1180        }
1181
1182        /*
1183         * If .git/config does not exist yet, write a minimal version.
1184         */
1185        in_fd = open(config_filename, O_RDONLY);
1186        if ( in_fd < 0 ) {
1187                free(store.key);
1188
1189                if ( ENOENT != errno ) {
1190                        error("opening %s: %s", config_filename,
1191                              strerror(errno));
1192                        ret = 3; /* same as "invalid config file" */
1193                        goto out_free;
1194                }
1195                /* if nothing to unset, error out */
1196                if (value == NULL) {
1197                        ret = 5;
1198                        goto out_free;
1199                }
1200
1201                store.key = (char *)key;
1202                if (!store_write_section(fd, key) ||
1203                    !store_write_pair(fd, key, value))
1204                        goto write_err_out;
1205        } else {
1206                struct stat st;
1207                char *contents;
1208                size_t contents_sz, copy_begin, copy_end;
1209                int i, new_line = 0;
1210
1211                if (value_regex == NULL)
1212                        store.value_regex = NULL;
1213                else {
1214                        if (value_regex[0] == '!') {
1215                                store.do_not_match = 1;
1216                                value_regex++;
1217                        } else
1218                                store.do_not_match = 0;
1219
1220                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1221                        if (regcomp(store.value_regex, value_regex,
1222                                        REG_EXTENDED)) {
1223                                error("invalid pattern: %s", value_regex);
1224                                free(store.value_regex);
1225                                ret = 6;
1226                                goto out_free;
1227                        }
1228                }
1229
1230                store.offset[0] = 0;
1231                store.state = START;
1232                store.seen = 0;
1233
1234                /*
1235                 * After this, store.offset will contain the *end* offset
1236                 * of the last match, or remain at 0 if no match was found.
1237                 * As a side effect, we make sure to transform only a valid
1238                 * existing config file.
1239                 */
1240                if (git_config_from_file(store_aux, config_filename, NULL)) {
1241                        error("invalid config file %s", config_filename);
1242                        free(store.key);
1243                        if (store.value_regex != NULL) {
1244                                regfree(store.value_regex);
1245                                free(store.value_regex);
1246                        }
1247                        ret = 3;
1248                        goto out_free;
1249                }
1250
1251                free(store.key);
1252                if (store.value_regex != NULL) {
1253                        regfree(store.value_regex);
1254                        free(store.value_regex);
1255                }
1256
1257                /* if nothing to unset, or too many matches, error out */
1258                if ((store.seen == 0 && value == NULL) ||
1259                                (store.seen > 1 && multi_replace == 0)) {
1260                        ret = 5;
1261                        goto out_free;
1262                }
1263
1264                fstat(in_fd, &st);
1265                contents_sz = xsize_t(st.st_size);
1266                contents = xmmap(NULL, contents_sz, PROT_READ,
1267                        MAP_PRIVATE, in_fd, 0);
1268                close(in_fd);
1269
1270                if (store.seen == 0)
1271                        store.seen = 1;
1272
1273                for (i = 0, copy_begin = 0; i < store.seen; i++) {
1274                        if (store.offset[i] == 0) {
1275                                store.offset[i] = copy_end = contents_sz;
1276                        } else if (store.state != KEY_SEEN) {
1277                                copy_end = store.offset[i];
1278                        } else
1279                                copy_end = find_beginning_of_line(
1280                                        contents, contents_sz,
1281                                        store.offset[i]-2, &new_line);
1282
1283                        if (copy_end > 0 && contents[copy_end-1] != '\n')
1284                                new_line = 1;
1285
1286                        /* write the first part of the config */
1287                        if (copy_end > copy_begin) {
1288                                if (write_in_full(fd, contents + copy_begin,
1289                                                  copy_end - copy_begin) <
1290                                    copy_end - copy_begin)
1291                                        goto write_err_out;
1292                                if (new_line &&
1293                                    write_str_in_full(fd, "\n") != 1)
1294                                        goto write_err_out;
1295                        }
1296                        copy_begin = store.offset[i];
1297                }
1298
1299                /* write the pair (value == NULL means unset) */
1300                if (value != NULL) {
1301                        if (store.state == START) {
1302                                if (!store_write_section(fd, key))
1303                                        goto write_err_out;
1304                        }
1305                        if (!store_write_pair(fd, key, value))
1306                                goto write_err_out;
1307                }
1308
1309                /* write the rest of the config */
1310                if (copy_begin < contents_sz)
1311                        if (write_in_full(fd, contents + copy_begin,
1312                                          contents_sz - copy_begin) <
1313                            contents_sz - copy_begin)
1314                                goto write_err_out;
1315
1316                munmap(contents, contents_sz);
1317        }
1318
1319        if (commit_lock_file(lock) < 0) {
1320                error("could not commit config file %s", config_filename);
1321                ret = 4;
1322                goto out_free;
1323        }
1324
1325        /*
1326         * lock is committed, so don't try to roll it back below.
1327         * NOTE: Since lockfile.c keeps a linked list of all created
1328         * lock_file structures, it isn't safe to free(lock).  It's
1329         * better to just leave it hanging around.
1330         */
1331        lock = NULL;
1332        ret = 0;
1333
1334out_free:
1335        if (lock)
1336                rollback_lock_file(lock);
1337        free(config_filename);
1338        return ret;
1339
1340write_err_out:
1341        ret = write_error(lock->filename);
1342        goto out_free;
1343
1344}
1345
1346static int section_name_match (const char *buf, const char *name)
1347{
1348        int i = 0, j = 0, dot = 0;
1349        if (buf[i] != '[')
1350                return 0;
1351        for (i = 1; buf[i] && buf[i] != ']'; i++) {
1352                if (!dot && isspace(buf[i])) {
1353                        dot = 1;
1354                        if (name[j++] != '.')
1355                                break;
1356                        for (i++; isspace(buf[i]); i++)
1357                                ; /* do nothing */
1358                        if (buf[i] != '"')
1359                                break;
1360                        continue;
1361                }
1362                if (buf[i] == '\\' && dot)
1363                        i++;
1364                else if (buf[i] == '"' && dot) {
1365                        for (i++; isspace(buf[i]); i++)
1366                                ; /* do_nothing */
1367                        break;
1368                }
1369                if (buf[i] != name[j++])
1370                        break;
1371        }
1372        if (buf[i] == ']' && name[j] == 0) {
1373                /*
1374                 * We match, now just find the right length offset by
1375                 * gobbling up any whitespace after it, as well
1376                 */
1377                i++;
1378                for (; buf[i] && isspace(buf[i]); i++)
1379                        ; /* do nothing */
1380                return i;
1381        }
1382        return 0;
1383}
1384
1385/* if new_name == NULL, the section is removed instead */
1386int git_config_rename_section(const char *old_name, const char *new_name)
1387{
1388        int ret = 0, remove = 0;
1389        char *config_filename;
1390        struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1391        int out_fd;
1392        char buf[1024];
1393
1394        if (config_exclusive_filename)
1395                config_filename = xstrdup(config_exclusive_filename);
1396        else
1397                config_filename = git_pathdup("config");
1398        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1399        if (out_fd < 0) {
1400                ret = error("could not lock config file %s", config_filename);
1401                goto out;
1402        }
1403
1404        if (!(config_file = fopen(config_filename, "rb"))) {
1405                /* no config file means nothing to rename, no error */
1406                goto unlock_and_out;
1407        }
1408
1409        while (fgets(buf, sizeof(buf), config_file)) {
1410                int i;
1411                int length;
1412                char *output = buf;
1413                for (i = 0; buf[i] && isspace(buf[i]); i++)
1414                        ; /* do nothing */
1415                if (buf[i] == '[') {
1416                        /* it's a section */
1417                        int offset = section_name_match(&buf[i], old_name);
1418                        if (offset > 0) {
1419                                ret++;
1420                                if (new_name == NULL) {
1421                                        remove = 1;
1422                                        continue;
1423                                }
1424                                store.baselen = strlen(new_name);
1425                                if (!store_write_section(out_fd, new_name)) {
1426                                        ret = write_error(lock->filename);
1427                                        goto out;
1428                                }
1429                                /*
1430                                 * We wrote out the new section, with
1431                                 * a newline, now skip the old
1432                                 * section's length
1433                                 */
1434                                output += offset + i;
1435                                if (strlen(output) > 0) {
1436                                        /*
1437                                         * More content means there's
1438                                         * a declaration to put on the
1439                                         * next line; indent with a
1440                                         * tab
1441                                         */
1442                                        output -= 1;
1443                                        output[0] = '\t';
1444                                }
1445                        }
1446                        remove = 0;
1447                }
1448                if (remove)
1449                        continue;
1450                length = strlen(output);
1451                if (write_in_full(out_fd, output, length) != length) {
1452                        ret = write_error(lock->filename);
1453                        goto out;
1454                }
1455        }
1456        fclose(config_file);
1457 unlock_and_out:
1458        if (commit_lock_file(lock) < 0)
1459                ret = error("could not commit config file %s", config_filename);
1460 out:
1461        free(config_filename);
1462        return ret;
1463}
1464
1465/*
1466 * Call this to report error for your variable that should not
1467 * get a boolean value (i.e. "[my] var" means "true").
1468 */
1469int config_error_nonbool(const char *var)
1470{
1471        return error("Missing value for '%s'", var);
1472}