Andrew's git / gitweb.git / config.c
?
config.con commit Merge branch 'js/maint-send-pack-stateless-rpc-deadlock-fix' into maint-1.7.4 (34df9fe)
   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        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
  37void git_config_push_parameter(const char *text)
  38{
  39        struct strbuf env = STRBUF_INIT;
  40        const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
  41        if (old) {
  42                strbuf_addstr(&env, old);
  43                strbuf_addch(&env, ' ');
  44        }
  45        sq_quote_buf(&env, text);
  46        setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
  47        strbuf_release(&env);
  48}
  49
  50int git_config_parse_parameter(const char *text)
  51{
  52        struct config_item *ct;
  53        struct strbuf tmp = STRBUF_INIT;
  54        struct strbuf **pair;
  55        strbuf_addstr(&tmp, text);
  56        pair = strbuf_split(&tmp, '=');
  57        if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=')
  58                strbuf_setlen(pair[0], pair[0]->len - 1);
  59        strbuf_trim(pair[0]);
  60        if (!pair[0]->len) {
  61                strbuf_list_free(pair);
  62                return -1;
  63        }
  64        ct = xcalloc(1, sizeof(struct config_item));
  65        ct->name = strbuf_detach(pair[0], NULL);
  66        if (pair[1]) {
  67                strbuf_trim(pair[1]);
  68                ct->value = strbuf_detach(pair[1], NULL);
  69        }
  70        strbuf_list_free(pair);
  71        lowercase(ct->name);
  72        *config_parameters_tail = ct;
  73        config_parameters_tail = &ct->next;
  74        return 0;
  75}
  76
  77int git_config_parse_environment(void) {
  78        const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
  79        char *envw;
  80        const char **argv = NULL;
  81        int nr = 0, alloc = 0;
  82        int i;
  83
  84        if (!env)
  85                return 0;
  86        /* sq_dequote will write over it */
  87        envw = xstrdup(env);
  88
  89        if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
  90                free(envw);
  91                return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
  92        }
  93
  94        for (i = 0; i < nr; i++) {
  95                if (git_config_parse_parameter(argv[i]) < 0) {
  96                        error("bogus config parameter: %s", argv[i]);
  97                        free(argv);
  98                        free(envw);
  99                        return -1;
 100                }
 101        }
 102
 103        free(argv);
 104        free(envw);
 105        return 0;
 106}
 107
 108static int get_next_char(void)
 109{
 110        int c;
 111        FILE *f;
 112
 113        c = '\n';
 114        if ((f = config_file) != NULL) {
 115                c = fgetc(f);
 116                if (c == '\r') {
 117                        /* DOS like systems */
 118                        c = fgetc(f);
 119                        if (c != '\n') {
 120                                ungetc(c, f);
 121                                c = '\r';
 122                        }
 123                }
 124                if (c == '\n')
 125                        config_linenr++;
 126                if (c == EOF) {
 127                        config_file_eof = 1;
 128                        c = '\n';
 129                }
 130        }
 131        return c;
 132}
 133
 134static char *parse_value(void)
 135{
 136        static char value[1024];
 137        int quote = 0, comment = 0, len = 0, space = 0;
 138
 139        for (;;) {
 140                int c = get_next_char();
 141                if (len >= sizeof(value) - 1)
 142                        return NULL;
 143                if (c == '\n') {
 144                        if (quote)
 145                                return NULL;
 146                        value[len] = 0;
 147                        return value;
 148                }
 149                if (comment)
 150                        continue;
 151                if (isspace(c) && !quote) {
 152                        if (len)
 153                                space++;
 154                        continue;
 155                }
 156                if (!quote) {
 157                        if (c == ';' || c == '#') {
 158                                comment = 1;
 159                                continue;
 160                        }
 161                }
 162                for (; space; space--)
 163                        value[len++] = ' ';
 164                if (c == '\\') {
 165                        c = get_next_char();
 166                        switch (c) {
 167                        case '\n':
 168                                continue;
 169                        case 't':
 170                                c = '\t';
 171                                break;
 172                        case 'b':
 173                                c = '\b';
 174                                break;
 175                        case 'n':
 176                                c = '\n';
 177                                break;
 178                        /* Some characters escape as themselves */
 179                        case '\\': case '"':
 180                                break;
 181                        /* Reject unknown escape sequences */
 182                        default:
 183                                return NULL;
 184                        }
 185                        value[len++] = c;
 186                        continue;
 187                }
 188                if (c == '"') {
 189                        quote = 1-quote;
 190                        continue;
 191                }
 192                value[len++] = c;
 193        }
 194}
 195
 196static inline int iskeychar(int c)
 197{
 198        return isalnum(c) || c == '-';
 199}
 200
 201static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)
 202{
 203        int c;
 204        char *value;
 205
 206        /* Get the full name */
 207        for (;;) {
 208                c = get_next_char();
 209                if (config_file_eof)
 210                        break;
 211                if (!iskeychar(c))
 212                        break;
 213                name[len++] = tolower(c);
 214                if (len >= MAXNAME)
 215                        return -1;
 216        }
 217        name[len] = 0;
 218        while (c == ' ' || c == '\t')
 219                c = get_next_char();
 220
 221        value = NULL;
 222        if (c != '\n') {
 223                if (c != '=')
 224                        return -1;
 225                value = parse_value();
 226                if (!value)
 227                        return -1;
 228        }
 229        return fn(name, value, data);
 230}
 231
 232static int get_extended_base_var(char *name, int baselen, int c)
 233{
 234        do {
 235                if (c == '\n')
 236                        return -1;
 237                c = get_next_char();
 238        } while (isspace(c));
 239
 240        /* We require the format to be '[base "extension"]' */
 241        if (c != '"')
 242                return -1;
 243        name[baselen++] = '.';
 244
 245        for (;;) {
 246                int c = get_next_char();
 247                if (c == '\n')
 248                        return -1;
 249                if (c == '"')
 250                        break;
 251                if (c == '\\') {
 252                        c = get_next_char();
 253                        if (c == '\n')
 254                                return -1;
 255                }
 256                name[baselen++] = c;
 257                if (baselen > MAXNAME / 2)
 258                        return -1;
 259        }
 260
 261        /* Final ']' */
 262        if (get_next_char() != ']')
 263                return -1;
 264        return baselen;
 265}
 266
 267static int get_base_var(char *name)
 268{
 269        int baselen = 0;
 270
 271        for (;;) {
 272                int c = get_next_char();
 273                if (config_file_eof)
 274                        return -1;
 275                if (c == ']')
 276                        return baselen;
 277                if (isspace(c))
 278                        return get_extended_base_var(name, baselen, c);
 279                if (!iskeychar(c) && c != '.')
 280                        return -1;
 281                if (baselen > MAXNAME / 2)
 282                        return -1;
 283                name[baselen++] = tolower(c);
 284        }
 285}
 286
 287static int git_parse_file(config_fn_t fn, void *data)
 288{
 289        int comment = 0;
 290        int baselen = 0;
 291        static char var[MAXNAME];
 292
 293        /* U+FEFF Byte Order Mark in UTF8 */
 294        static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
 295        const unsigned char *bomptr = utf8_bom;
 296
 297        for (;;) {
 298                int c = get_next_char();
 299                if (bomptr && *bomptr) {
 300                        /* We are at the file beginning; skip UTF8-encoded BOM
 301                         * if present. Sane editors won't put this in on their
 302                         * own, but e.g. Windows Notepad will do it happily. */
 303                        if ((unsigned char) c == *bomptr) {
 304                                bomptr++;
 305                                continue;
 306                        } else {
 307                                /* Do not tolerate partial BOM. */
 308                                if (bomptr != utf8_bom)
 309                                        break;
 310                                /* No BOM at file beginning. Cool. */
 311                                bomptr = NULL;
 312                        }
 313                }
 314                if (c == '\n') {
 315                        if (config_file_eof)
 316                                return 0;
 317                        comment = 0;
 318                        continue;
 319                }
 320                if (comment || isspace(c))
 321                        continue;
 322                if (c == '#' || c == ';') {
 323                        comment = 1;
 324                        continue;
 325                }
 326                if (c == '[') {
 327                        baselen = get_base_var(var);
 328                        if (baselen <= 0)
 329                                break;
 330                        var[baselen++] = '.';
 331                        var[baselen] = 0;
 332                        continue;
 333                }
 334                if (!isalpha(c))
 335                        break;
 336                var[baselen] = tolower(c);
 337                if (get_value(fn, data, var, baselen+1) < 0)
 338                        break;
 339        }
 340        die("bad config file line %d in %s", config_linenr, config_file_name);
 341}
 342
 343static int parse_unit_factor(const char *end, unsigned long *val)
 344{
 345        if (!*end)
 346                return 1;
 347        else if (!strcasecmp(end, "k")) {
 348                *val *= 1024;
 349                return 1;
 350        }
 351        else if (!strcasecmp(end, "m")) {
 352                *val *= 1024 * 1024;
 353                return 1;
 354        }
 355        else if (!strcasecmp(end, "g")) {
 356                *val *= 1024 * 1024 * 1024;
 357                return 1;
 358        }
 359        return 0;
 360}
 361
 362static int git_parse_long(const char *value, long *ret)
 363{
 364        if (value && *value) {
 365                char *end;
 366                long val = strtol(value, &end, 0);
 367                unsigned long factor = 1;
 368                if (!parse_unit_factor(end, &factor))
 369                        return 0;
 370                *ret = val * factor;
 371                return 1;
 372        }
 373        return 0;
 374}
 375
 376int git_parse_ulong(const char *value, unsigned long *ret)
 377{
 378        if (value && *value) {
 379                char *end;
 380                unsigned long val = strtoul(value, &end, 0);
 381                if (!parse_unit_factor(end, &val))
 382                        return 0;
 383                *ret = val;
 384                return 1;
 385        }
 386        return 0;
 387}
 388
 389static void die_bad_config(const char *name)
 390{
 391        if (config_file_name)
 392                die("bad config value for '%s' in %s", name, config_file_name);
 393        die("bad config value for '%s'", name);
 394}
 395
 396int git_config_int(const char *name, const char *value)
 397{
 398        long ret = 0;
 399        if (!git_parse_long(value, &ret))
 400                die_bad_config(name);
 401        return ret;
 402}
 403
 404unsigned long git_config_ulong(const char *name, const char *value)
 405{
 406        unsigned long ret;
 407        if (!git_parse_ulong(value, &ret))
 408                die_bad_config(name);
 409        return ret;
 410}
 411
 412static int git_config_maybe_bool_text(const char *name, const char *value)
 413{
 414        if (!value)
 415                return 1;
 416        if (!*value)
 417                return 0;
 418        if (!strcasecmp(value, "true")
 419            || !strcasecmp(value, "yes")
 420            || !strcasecmp(value, "on"))
 421                return 1;
 422        if (!strcasecmp(value, "false")
 423            || !strcasecmp(value, "no")
 424            || !strcasecmp(value, "off"))
 425                return 0;
 426        return -1;
 427}
 428
 429int git_config_maybe_bool(const char *name, const char *value)
 430{
 431        long v = git_config_maybe_bool_text(name, value);
 432        if (0 <= v)
 433                return v;
 434        if (git_parse_long(value, &v))
 435                return !!v;
 436        return -1;
 437}
 438
 439int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 440{
 441        int v = git_config_maybe_bool_text(name, value);
 442        if (0 <= v) {
 443                *is_bool = 1;
 444                return v;
 445        }
 446        *is_bool = 0;
 447        return git_config_int(name, value);
 448}
 449
 450int git_config_bool(const char *name, const char *value)
 451{
 452        int discard;
 453        return !!git_config_bool_or_int(name, value, &discard);
 454}
 455
 456int git_config_string(const char **dest, const char *var, const char *value)
 457{
 458        if (!value)
 459                return config_error_nonbool(var);
 460        *dest = xstrdup(value);
 461        return 0;
 462}
 463
 464int git_config_pathname(const char **dest, const char *var, const char *value)
 465{
 466        if (!value)
 467                return config_error_nonbool(var);
 468        *dest = expand_user_path(value);
 469        if (!*dest)
 470                die("Failed to expand user dir in: '%s'", value);
 471        return 0;
 472}
 473
 474static int git_default_core_config(const char *var, const char *value)
 475{
 476        /* This needs a better name */
 477        if (!strcmp(var, "core.filemode")) {
 478                trust_executable_bit = git_config_bool(var, value);
 479                return 0;
 480        }
 481        if (!strcmp(var, "core.trustctime")) {
 482                trust_ctime = git_config_bool(var, value);
 483                return 0;
 484        }
 485
 486        if (!strcmp(var, "core.quotepath")) {
 487                quote_path_fully = git_config_bool(var, value);
 488                return 0;
 489        }
 490
 491        if (!strcmp(var, "core.symlinks")) {
 492                has_symlinks = git_config_bool(var, value);
 493                return 0;
 494        }
 495
 496        if (!strcmp(var, "core.ignorecase")) {
 497                ignore_case = git_config_bool(var, value);
 498                return 0;
 499        }
 500
 501        if (!strcmp(var, "core.bare")) {
 502                is_bare_repository_cfg = git_config_bool(var, value);
 503                return 0;
 504        }
 505
 506        if (!strcmp(var, "core.ignorestat")) {
 507                assume_unchanged = git_config_bool(var, value);
 508                return 0;
 509        }
 510
 511        if (!strcmp(var, "core.prefersymlinkrefs")) {
 512                prefer_symlink_refs = git_config_bool(var, value);
 513                return 0;
 514        }
 515
 516        if (!strcmp(var, "core.logallrefupdates")) {
 517                log_all_ref_updates = git_config_bool(var, value);
 518                return 0;
 519        }
 520
 521        if (!strcmp(var, "core.warnambiguousrefs")) {
 522                warn_ambiguous_refs = git_config_bool(var, value);
 523                return 0;
 524        }
 525
 526        if (!strcmp(var, "core.abbrev")) {
 527                int abbrev = git_config_int(var, value);
 528                if (abbrev < minimum_abbrev || abbrev > 40)
 529                        return -1;
 530                default_abbrev = abbrev;
 531                return 0;
 532        }
 533
 534        if (!strcmp(var, "core.loosecompression")) {
 535                int level = git_config_int(var, value);
 536                if (level == -1)
 537                        level = Z_DEFAULT_COMPRESSION;
 538                else if (level < 0 || level > Z_BEST_COMPRESSION)
 539                        die("bad zlib compression level %d", level);
 540                zlib_compression_level = level;
 541                zlib_compression_seen = 1;
 542                return 0;
 543        }
 544
 545        if (!strcmp(var, "core.compression")) {
 546                int level = git_config_int(var, value);
 547                if (level == -1)
 548                        level = Z_DEFAULT_COMPRESSION;
 549                else if (level < 0 || level > Z_BEST_COMPRESSION)
 550                        die("bad zlib compression level %d", level);
 551                core_compression_level = level;
 552                core_compression_seen = 1;
 553                if (!zlib_compression_seen)
 554                        zlib_compression_level = level;
 555                return 0;
 556        }
 557
 558        if (!strcmp(var, "core.packedgitwindowsize")) {
 559                int pgsz_x2 = getpagesize() * 2;
 560                packed_git_window_size = git_config_int(var, value);
 561
 562                /* This value must be multiple of (pagesize * 2) */
 563                packed_git_window_size /= pgsz_x2;
 564                if (packed_git_window_size < 1)
 565                        packed_git_window_size = 1;
 566                packed_git_window_size *= pgsz_x2;
 567                return 0;
 568        }
 569
 570        if (!strcmp(var, "core.packedgitlimit")) {
 571                packed_git_limit = git_config_int(var, value);
 572                return 0;
 573        }
 574
 575        if (!strcmp(var, "core.deltabasecachelimit")) {
 576                delta_base_cache_limit = git_config_int(var, value);
 577                return 0;
 578        }
 579
 580        if (!strcmp(var, "core.autocrlf")) {
 581                if (value && !strcasecmp(value, "input")) {
 582                        if (eol == EOL_CRLF)
 583                                return error("core.autocrlf=input conflicts with core.eol=crlf");
 584                        auto_crlf = AUTO_CRLF_INPUT;
 585                        return 0;
 586                }
 587                auto_crlf = git_config_bool(var, value);
 588                return 0;
 589        }
 590
 591        if (!strcmp(var, "core.safecrlf")) {
 592                if (value && !strcasecmp(value, "warn")) {
 593                        safe_crlf = SAFE_CRLF_WARN;
 594                        return 0;
 595                }
 596                safe_crlf = git_config_bool(var, value);
 597                return 0;
 598        }
 599
 600        if (!strcmp(var, "core.eol")) {
 601                if (value && !strcasecmp(value, "lf"))
 602                        eol = EOL_LF;
 603                else if (value && !strcasecmp(value, "crlf"))
 604                        eol = EOL_CRLF;
 605                else if (value && !strcasecmp(value, "native"))
 606                        eol = EOL_NATIVE;
 607                else
 608                        eol = EOL_UNSET;
 609                if (eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 610                        return error("core.autocrlf=input conflicts with core.eol=crlf");
 611                return 0;
 612        }
 613
 614        if (!strcmp(var, "core.notesref")) {
 615                notes_ref_name = xstrdup(value);
 616                return 0;
 617        }
 618
 619        if (!strcmp(var, "core.pager"))
 620                return git_config_string(&pager_program, var, value);
 621
 622        if (!strcmp(var, "core.editor"))
 623                return git_config_string(&editor_program, var, value);
 624
 625        if (!strcmp(var, "core.askpass"))
 626                return git_config_string(&askpass_program, var, value);
 627
 628        if (!strcmp(var, "core.excludesfile"))
 629                return git_config_pathname(&excludes_file, var, value);
 630
 631        if (!strcmp(var, "core.whitespace")) {
 632                if (!value)
 633                        return config_error_nonbool(var);
 634                whitespace_rule_cfg = parse_whitespace_rule(value);
 635                return 0;
 636        }
 637
 638        if (!strcmp(var, "core.fsyncobjectfiles")) {
 639                fsync_object_files = git_config_bool(var, value);
 640                return 0;
 641        }
 642
 643        if (!strcmp(var, "core.preloadindex")) {
 644                core_preload_index = git_config_bool(var, value);
 645                return 0;
 646        }
 647
 648        if (!strcmp(var, "core.createobject")) {
 649                if (!strcmp(value, "rename"))
 650                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 651                else if (!strcmp(value, "link"))
 652                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 653                else
 654                        die("Invalid mode for object creation: %s", value);
 655                return 0;
 656        }
 657
 658        if (!strcmp(var, "core.sparsecheckout")) {
 659                core_apply_sparse_checkout = git_config_bool(var, value);
 660                return 0;
 661        }
 662
 663        /* Add other config variables here and to Documentation/config.txt. */
 664        return 0;
 665}
 666
 667static int git_default_user_config(const char *var, const char *value)
 668{
 669        if (!strcmp(var, "user.name")) {
 670                if (!value)
 671                        return config_error_nonbool(var);
 672                strlcpy(git_default_name, value, sizeof(git_default_name));
 673                user_ident_explicitly_given |= IDENT_NAME_GIVEN;
 674                return 0;
 675        }
 676
 677        if (!strcmp(var, "user.email")) {
 678                if (!value)
 679                        return config_error_nonbool(var);
 680                strlcpy(git_default_email, value, sizeof(git_default_email));
 681                user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 682                return 0;
 683        }
 684
 685        /* Add other config variables here and to Documentation/config.txt. */
 686        return 0;
 687}
 688
 689static int git_default_i18n_config(const char *var, const char *value)
 690{
 691        if (!strcmp(var, "i18n.commitencoding"))
 692                return git_config_string(&git_commit_encoding, var, value);
 693
 694        if (!strcmp(var, "i18n.logoutputencoding"))
 695                return git_config_string(&git_log_output_encoding, var, value);
 696
 697        /* Add other config variables here and to Documentation/config.txt. */
 698        return 0;
 699}
 700
 701static int git_default_branch_config(const char *var, const char *value)
 702{
 703        if (!strcmp(var, "branch.autosetupmerge")) {
 704                if (value && !strcasecmp(value, "always")) {
 705                        git_branch_track = BRANCH_TRACK_ALWAYS;
 706                        return 0;
 707                }
 708                git_branch_track = git_config_bool(var, value);
 709                return 0;
 710        }
 711        if (!strcmp(var, "branch.autosetuprebase")) {
 712                if (!value)
 713                        return config_error_nonbool(var);
 714                else if (!strcmp(value, "never"))
 715                        autorebase = AUTOREBASE_NEVER;
 716                else if (!strcmp(value, "local"))
 717                        autorebase = AUTOREBASE_LOCAL;
 718                else if (!strcmp(value, "remote"))
 719                        autorebase = AUTOREBASE_REMOTE;
 720                else if (!strcmp(value, "always"))
 721                        autorebase = AUTOREBASE_ALWAYS;
 722                else
 723                        return error("Malformed value for %s", var);
 724                return 0;
 725        }
 726
 727        /* Add other config variables here and to Documentation/config.txt. */
 728        return 0;
 729}
 730
 731static int git_default_push_config(const char *var, const char *value)
 732{
 733        if (!strcmp(var, "push.default")) {
 734                if (!value)
 735                        return config_error_nonbool(var);
 736                else if (!strcmp(value, "nothing"))
 737                        push_default = PUSH_DEFAULT_NOTHING;
 738                else if (!strcmp(value, "matching"))
 739                        push_default = PUSH_DEFAULT_MATCHING;
 740                else if (!strcmp(value, "upstream"))
 741                        push_default = PUSH_DEFAULT_UPSTREAM;
 742                else if (!strcmp(value, "tracking")) /* deprecated */
 743                        push_default = PUSH_DEFAULT_UPSTREAM;
 744                else if (!strcmp(value, "current"))
 745                        push_default = PUSH_DEFAULT_CURRENT;
 746                else {
 747                        error("Malformed value for %s: %s", var, value);
 748                        return error("Must be one of nothing, matching, "
 749                                     "tracking or current.");
 750                }
 751                return 0;
 752        }
 753
 754        /* Add other config variables here and to Documentation/config.txt. */
 755        return 0;
 756}
 757
 758static int git_default_mailmap_config(const char *var, const char *value)
 759{
 760        if (!strcmp(var, "mailmap.file"))
 761                return git_config_string(&git_mailmap_file, var, value);
 762
 763        /* Add other config variables here and to Documentation/config.txt. */
 764        return 0;
 765}
 766
 767int git_default_config(const char *var, const char *value, void *dummy)
 768{
 769        if (!prefixcmp(var, "core."))
 770                return git_default_core_config(var, value);
 771
 772        if (!prefixcmp(var, "user."))
 773                return git_default_user_config(var, value);
 774
 775        if (!prefixcmp(var, "i18n."))
 776                return git_default_i18n_config(var, value);
 777
 778        if (!prefixcmp(var, "branch."))
 779                return git_default_branch_config(var, value);
 780
 781        if (!prefixcmp(var, "push."))
 782                return git_default_push_config(var, value);
 783
 784        if (!prefixcmp(var, "mailmap."))
 785                return git_default_mailmap_config(var, value);
 786
 787        if (!prefixcmp(var, "advice."))
 788                return git_default_advice_config(var, value);
 789
 790        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 791                pager_use_color = git_config_bool(var,value);
 792                return 0;
 793        }
 794
 795        /* Add other config variables here and to Documentation/config.txt. */
 796        return 0;
 797}
 798
 799int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 800{
 801        int ret;
 802        FILE *f = fopen(filename, "r");
 803
 804        ret = -1;
 805        if (f) {
 806                config_file = f;
 807                config_file_name = filename;
 808                config_linenr = 1;
 809                config_file_eof = 0;
 810                ret = git_parse_file(fn, data);
 811                fclose(f);
 812                config_file_name = NULL;
 813        }
 814        return ret;
 815}
 816
 817const char *git_etc_gitconfig(void)
 818{
 819        static const char *system_wide;
 820        if (!system_wide)
 821                system_wide = system_path(ETC_GITCONFIG);
 822        return system_wide;
 823}
 824
 825int git_env_bool(const char *k, int def)
 826{
 827        const char *v = getenv(k);
 828        return v ? git_config_bool(k, v) : def;
 829}
 830
 831int git_config_system(void)
 832{
 833        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 834}
 835
 836int git_config_global(void)
 837{
 838        return !git_env_bool("GIT_CONFIG_NOGLOBAL", 0);
 839}
 840
 841int git_config_from_parameters(config_fn_t fn, void *data)
 842{
 843        static int loaded_environment;
 844        const struct config_item *ct;
 845
 846        if (!loaded_environment) {
 847                if (git_config_parse_environment() < 0)
 848                        return -1;
 849                loaded_environment = 1;
 850        }
 851        for (ct = config_parameters; ct; ct = ct->next)
 852                if (fn(ct->name, ct->value, data) < 0)
 853                        return -1;
 854        return 0;
 855}
 856
 857int git_config_early(config_fn_t fn, void *data, const char *repo_config)
 858{
 859        int ret = 0, found = 0;
 860        const char *home = NULL;
 861
 862        /* Setting $GIT_CONFIG makes git read _only_ the given config file. */
 863        if (config_exclusive_filename)
 864                return git_config_from_file(fn, config_exclusive_filename, data);
 865        if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
 866                ret += git_config_from_file(fn, git_etc_gitconfig(),
 867                                            data);
 868                found += 1;
 869        }
 870
 871        home = getenv("HOME");
 872        if (git_config_global() && home) {
 873                char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
 874                if (!access(user_config, R_OK)) {
 875                        ret += git_config_from_file(fn, user_config, data);
 876                        found += 1;
 877                }
 878                free(user_config);
 879        }
 880
 881        if (repo_config && !access(repo_config, R_OK)) {
 882                ret += git_config_from_file(fn, repo_config, data);
 883                found += 1;
 884        }
 885
 886        ret += git_config_from_parameters(fn, data);
 887        if (config_parameters)
 888                found += 1;
 889
 890        return ret == 0 ? found : ret;
 891}
 892
 893int git_config(config_fn_t fn, void *data)
 894{
 895        char *repo_config = NULL;
 896        int ret;
 897
 898        repo_config = git_pathdup("config");
 899        ret = git_config_early(fn, data, repo_config);
 900        if (repo_config)
 901                free(repo_config);
 902        return ret;
 903}
 904
 905/*
 906 * Find all the stuff for git_config_set() below.
 907 */
 908
 909#define MAX_MATCHES 512
 910
 911static struct {
 912        int baselen;
 913        char *key;
 914        int do_not_match;
 915        regex_t *value_regex;
 916        int multi_replace;
 917        size_t offset[MAX_MATCHES];
 918        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
 919        int seen;
 920} store;
 921
 922static int matches(const char *key, const char *value)
 923{
 924        return !strcmp(key, store.key) &&
 925                (store.value_regex == NULL ||
 926                 (store.do_not_match ^
 927                  !regexec(store.value_regex, value, 0, NULL, 0)));
 928}
 929
 930static int store_aux(const char *key, const char *value, void *cb)
 931{
 932        const char *ep;
 933        size_t section_len;
 934
 935        switch (store.state) {
 936        case KEY_SEEN:
 937                if (matches(key, value)) {
 938                        if (store.seen == 1 && store.multi_replace == 0) {
 939                                warning("%s has multiple values", key);
 940                        } else if (store.seen >= MAX_MATCHES) {
 941                                error("too many matches for %s", key);
 942                                return 1;
 943                        }
 944
 945                        store.offset[store.seen] = ftell(config_file);
 946                        store.seen++;
 947                }
 948                break;
 949        case SECTION_SEEN:
 950                /*
 951                 * What we are looking for is in store.key (both
 952                 * section and var), and its section part is baselen
 953                 * long.  We found key (again, both section and var).
 954                 * We would want to know if this key is in the same
 955                 * section as what we are looking for.  We already
 956                 * know we are in the same section as what should
 957                 * hold store.key.
 958                 */
 959                ep = strrchr(key, '.');
 960                section_len = ep - key;
 961
 962                if ((section_len != store.baselen) ||
 963                    memcmp(key, store.key, section_len+1)) {
 964                        store.state = SECTION_END_SEEN;
 965                        break;
 966                }
 967
 968                /*
 969                 * Do not increment matches: this is no match, but we
 970                 * just made sure we are in the desired section.
 971                 */
 972                store.offset[store.seen] = ftell(config_file);
 973                /* fallthru */
 974        case SECTION_END_SEEN:
 975        case START:
 976                if (matches(key, value)) {
 977                        store.offset[store.seen] = ftell(config_file);
 978                        store.state = KEY_SEEN;
 979                        store.seen++;
 980                } else {
 981                        if (strrchr(key, '.') - key == store.baselen &&
 982                              !strncmp(key, store.key, store.baselen)) {
 983                                        store.state = SECTION_SEEN;
 984                                        store.offset[store.seen] = ftell(config_file);
 985                        }
 986                }
 987        }
 988        return 0;
 989}
 990
 991static int write_error(const char *filename)
 992{
 993        error("failed to write new configuration file %s", filename);
 994
 995        /* Same error code as "failed to rename". */
 996        return 4;
 997}
 998
 999static int store_write_section(int fd, const char *key)
1000{
1001        const char *dot;
1002        int i, success;
1003        struct strbuf sb = STRBUF_INIT;
1004
1005        dot = memchr(key, '.', store.baselen);
1006        if (dot) {
1007                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1008                for (i = dot - key + 1; i < store.baselen; i++) {
1009                        if (key[i] == '"' || key[i] == '\\')
1010                                strbuf_addch(&sb, '\\');
1011                        strbuf_addch(&sb, key[i]);
1012                }
1013                strbuf_addstr(&sb, "\"]\n");
1014        } else {
1015                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1016        }
1017
1018        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1019        strbuf_release(&sb);
1020
1021        return success;
1022}
1023
1024static int store_write_pair(int fd, const char *key, const char *value)
1025{
1026        int i, success;
1027        int length = strlen(key + store.baselen + 1);
1028        const char *quote = "";
1029        struct strbuf sb = STRBUF_INIT;
1030
1031        /*
1032         * Check to see if the value needs to be surrounded with a dq pair.
1033         * Note that problematic characters are always backslash-quoted; this
1034         * check is about not losing leading or trailing SP and strings that
1035         * follow beginning-of-comment characters (i.e. ';' and '#') by the
1036         * configuration parser.
1037         */
1038        if (value[0] == ' ')
1039                quote = "\"";
1040        for (i = 0; value[i]; i++)
1041                if (value[i] == ';' || value[i] == '#')
1042                        quote = "\"";
1043        if (i && value[i - 1] == ' ')
1044                quote = "\"";
1045
1046        strbuf_addf(&sb, "\t%.*s = %s",
1047                    length, key + store.baselen + 1, quote);
1048
1049        for (i = 0; value[i]; i++)
1050                switch (value[i]) {
1051                case '\n':
1052                        strbuf_addstr(&sb, "\\n");
1053                        break;
1054                case '\t':
1055                        strbuf_addstr(&sb, "\\t");
1056                        break;
1057                case '"':
1058                case '\\':
1059                        strbuf_addch(&sb, '\\');
1060                default:
1061                        strbuf_addch(&sb, value[i]);
1062                        break;
1063                }
1064        strbuf_addf(&sb, "%s\n", quote);
1065
1066        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1067        strbuf_release(&sb);
1068
1069        return success;
1070}
1071
1072static ssize_t find_beginning_of_line(const char *contents, size_t size,
1073        size_t offset_, int *found_bracket)
1074{
1075        size_t equal_offset = size, bracket_offset = size;
1076        ssize_t offset;
1077
1078contline:
1079        for (offset = offset_-2; offset > 0
1080                        && contents[offset] != '\n'; offset--)
1081                switch (contents[offset]) {
1082                        case '=': equal_offset = offset; break;
1083                        case ']': bracket_offset = offset; break;
1084                }
1085        if (offset > 0 && contents[offset-1] == '\\') {
1086                offset_ = offset;
1087                goto contline;
1088        }
1089        if (bracket_offset < equal_offset) {
1090                *found_bracket = 1;
1091                offset = bracket_offset+1;
1092        } else
1093                offset++;
1094
1095        return offset;
1096}
1097
1098int git_config_set(const char *key, const char *value)
1099{
1100        return git_config_set_multivar(key, value, NULL, 0);
1101}
1102
1103/*
1104 * Auxiliary function to sanity-check and split the key into the section
1105 * identifier and variable name.
1106 *
1107 * Returns 0 on success, -1 when there is an invalid character in the key and
1108 * -2 if there is no section name in the key.
1109 *
1110 * store_key - pointer to char* which will hold a copy of the key with
1111 *             lowercase section and variable name
1112 * baselen - pointer to int which will hold the length of the
1113 *           section + subsection part, can be NULL
1114 */
1115int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1116{
1117        int i, dot, baselen;
1118        const char *last_dot = strrchr(key, '.');
1119
1120        /*
1121         * Since "key" actually contains the section name and the real
1122         * key name separated by a dot, we have to know where the dot is.
1123         */
1124
1125        if (last_dot == NULL || last_dot == key) {
1126                error("key does not contain a section: %s", key);
1127                return -2;
1128        }
1129
1130        if (!last_dot[1]) {
1131                error("key does not contain variable name: %s", key);
1132                return -2;
1133        }
1134
1135        baselen = last_dot - key;
1136        if (baselen_)
1137                *baselen_ = baselen;
1138
1139        /*
1140         * Validate the key and while at it, lower case it for matching.
1141         */
1142        *store_key = xmalloc(strlen(key) + 1);
1143
1144        dot = 0;
1145        for (i = 0; key[i]; i++) {
1146                unsigned char c = key[i];
1147                if (c == '.')
1148                        dot = 1;
1149                /* Leave the extended basename untouched.. */
1150                if (!dot || i > baselen) {
1151                        if (!iskeychar(c) ||
1152                            (i == baselen + 1 && !isalpha(c))) {
1153                                error("invalid key: %s", key);
1154                                goto out_free_ret_1;
1155                        }
1156                        c = tolower(c);
1157                } else if (c == '\n') {
1158                        error("invalid key (newline): %s", key);
1159                        goto out_free_ret_1;
1160                }
1161                (*store_key)[i] = c;
1162        }
1163        (*store_key)[i] = 0;
1164
1165        return 0;
1166
1167out_free_ret_1:
1168        free(*store_key);
1169        return -1;
1170}
1171
1172/*
1173 * If value==NULL, unset in (remove from) config,
1174 * if value_regex!=NULL, disregard key/value pairs where value does not match.
1175 * if multi_replace==0, nothing, or only one matching key/value is replaced,
1176 *     else all matching key/values (regardless how many) are removed,
1177 *     before the new pair is written.
1178 *
1179 * Returns 0 on success.
1180 *
1181 * This function does this:
1182 *
1183 * - it locks the config file by creating ".git/config.lock"
1184 *
1185 * - it then parses the config using store_aux() as validator to find
1186 *   the position on the key/value pair to replace. If it is to be unset,
1187 *   it must be found exactly once.
1188 *
1189 * - the config file is mmap()ed and the part before the match (if any) is
1190 *   written to the lock file, then the changed part and the rest.
1191 *
1192 * - the config file is removed and the lock file rename()d to it.
1193 *
1194 */
1195int git_config_set_multivar(const char *key, const char *value,
1196        const char *value_regex, int multi_replace)
1197{
1198        int fd = -1, in_fd;
1199        int ret;
1200        char *config_filename;
1201        struct lock_file *lock = NULL;
1202
1203        if (config_exclusive_filename)
1204                config_filename = xstrdup(config_exclusive_filename);
1205        else
1206                config_filename = git_pathdup("config");
1207
1208        /* parse-key returns negative; flip the sign to feed exit(3) */
1209        ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1210        if (ret)
1211                goto out_free;
1212
1213        store.multi_replace = multi_replace;
1214
1215
1216        /*
1217         * The lock serves a purpose in addition to locking: the new
1218         * contents of .git/config will be written into it.
1219         */
1220        lock = xcalloc(sizeof(struct lock_file), 1);
1221        fd = hold_lock_file_for_update(lock, config_filename, 0);
1222        if (fd < 0) {
1223                error("could not lock config file %s: %s", config_filename, strerror(errno));
1224                free(store.key);
1225                ret = -1;
1226                goto out_free;
1227        }
1228
1229        /*
1230         * If .git/config does not exist yet, write a minimal version.
1231         */
1232        in_fd = open(config_filename, O_RDONLY);
1233        if ( in_fd < 0 ) {
1234                free(store.key);
1235
1236                if ( ENOENT != errno ) {
1237                        error("opening %s: %s", config_filename,
1238                              strerror(errno));
1239                        ret = 3; /* same as "invalid config file" */
1240                        goto out_free;
1241                }
1242                /* if nothing to unset, error out */
1243                if (value == NULL) {
1244                        ret = 5;
1245                        goto out_free;
1246                }
1247
1248                store.key = (char *)key;
1249                if (!store_write_section(fd, key) ||
1250                    !store_write_pair(fd, key, value))
1251                        goto write_err_out;
1252        } else {
1253                struct stat st;
1254                char *contents;
1255                size_t contents_sz, copy_begin, copy_end;
1256                int i, new_line = 0;
1257
1258                if (value_regex == NULL)
1259                        store.value_regex = NULL;
1260                else {
1261                        if (value_regex[0] == '!') {
1262                                store.do_not_match = 1;
1263                                value_regex++;
1264                        } else
1265                                store.do_not_match = 0;
1266
1267                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1268                        if (regcomp(store.value_regex, value_regex,
1269                                        REG_EXTENDED)) {
1270                                error("invalid pattern: %s", value_regex);
1271                                free(store.value_regex);
1272                                ret = 6;
1273                                goto out_free;
1274                        }
1275                }
1276
1277                store.offset[0] = 0;
1278                store.state = START;
1279                store.seen = 0;
1280
1281                /*
1282                 * After this, store.offset will contain the *end* offset
1283                 * of the last match, or remain at 0 if no match was found.
1284                 * As a side effect, we make sure to transform only a valid
1285                 * existing config file.
1286                 */
1287                if (git_config_from_file(store_aux, config_filename, NULL)) {
1288                        error("invalid config file %s", config_filename);
1289                        free(store.key);
1290                        if (store.value_regex != NULL) {
1291                                regfree(store.value_regex);
1292                                free(store.value_regex);
1293                        }
1294                        ret = 3;
1295                        goto out_free;
1296                }
1297
1298                free(store.key);
1299                if (store.value_regex != NULL) {
1300                        regfree(store.value_regex);
1301                        free(store.value_regex);
1302                }
1303
1304                /* if nothing to unset, or too many matches, error out */
1305                if ((store.seen == 0 && value == NULL) ||
1306                                (store.seen > 1 && multi_replace == 0)) {
1307                        ret = 5;
1308                        goto out_free;
1309                }
1310
1311                fstat(in_fd, &st);
1312                contents_sz = xsize_t(st.st_size);
1313                contents = xmmap(NULL, contents_sz, PROT_READ,
1314                        MAP_PRIVATE, in_fd, 0);
1315                close(in_fd);
1316
1317                if (store.seen == 0)
1318                        store.seen = 1;
1319
1320                for (i = 0, copy_begin = 0; i < store.seen; i++) {
1321                        if (store.offset[i] == 0) {
1322                                store.offset[i] = copy_end = contents_sz;
1323                        } else if (store.state != KEY_SEEN) {
1324                                copy_end = store.offset[i];
1325                        } else
1326                                copy_end = find_beginning_of_line(
1327                                        contents, contents_sz,
1328                                        store.offset[i]-2, &new_line);
1329
1330                        if (copy_end > 0 && contents[copy_end-1] != '\n')
1331                                new_line = 1;
1332
1333                        /* write the first part of the config */
1334                        if (copy_end > copy_begin) {
1335                                if (write_in_full(fd, contents + copy_begin,
1336                                                  copy_end - copy_begin) <
1337                                    copy_end - copy_begin)
1338                                        goto write_err_out;
1339                                if (new_line &&
1340                                    write_str_in_full(fd, "\n") != 1)
1341                                        goto write_err_out;
1342                        }
1343                        copy_begin = store.offset[i];
1344                }
1345
1346                /* write the pair (value == NULL means unset) */
1347                if (value != NULL) {
1348                        if (store.state == START) {
1349                                if (!store_write_section(fd, key))
1350                                        goto write_err_out;
1351                        }
1352                        if (!store_write_pair(fd, key, value))
1353                                goto write_err_out;
1354                }
1355
1356                /* write the rest of the config */
1357                if (copy_begin < contents_sz)
1358                        if (write_in_full(fd, contents + copy_begin,
1359                                          contents_sz - copy_begin) <
1360                            contents_sz - copy_begin)
1361                                goto write_err_out;
1362
1363                munmap(contents, contents_sz);
1364        }
1365
1366        if (commit_lock_file(lock) < 0) {
1367                error("could not commit config file %s", config_filename);
1368                ret = 4;
1369                goto out_free;
1370        }
1371
1372        /*
1373         * lock is committed, so don't try to roll it back below.
1374         * NOTE: Since lockfile.c keeps a linked list of all created
1375         * lock_file structures, it isn't safe to free(lock).  It's
1376         * better to just leave it hanging around.
1377         */
1378        lock = NULL;
1379        ret = 0;
1380
1381out_free:
1382        if (lock)
1383                rollback_lock_file(lock);
1384        free(config_filename);
1385        return ret;
1386
1387write_err_out:
1388        ret = write_error(lock->filename);
1389        goto out_free;
1390
1391}
1392
1393static int section_name_match (const char *buf, const char *name)
1394{
1395        int i = 0, j = 0, dot = 0;
1396        if (buf[i] != '[')
1397                return 0;
1398        for (i = 1; buf[i] && buf[i] != ']'; i++) {
1399                if (!dot && isspace(buf[i])) {
1400                        dot = 1;
1401                        if (name[j++] != '.')
1402                                break;
1403                        for (i++; isspace(buf[i]); i++)
1404                                ; /* do nothing */
1405                        if (buf[i] != '"')
1406                                break;
1407                        continue;
1408                }
1409                if (buf[i] == '\\' && dot)
1410                        i++;
1411                else if (buf[i] == '"' && dot) {
1412                        for (i++; isspace(buf[i]); i++)
1413                                ; /* do_nothing */
1414                        break;
1415                }
1416                if (buf[i] != name[j++])
1417                        break;
1418        }
1419        if (buf[i] == ']' && name[j] == 0) {
1420                /*
1421                 * We match, now just find the right length offset by
1422                 * gobbling up any whitespace after it, as well
1423                 */
1424                i++;
1425                for (; buf[i] && isspace(buf[i]); i++)
1426                        ; /* do nothing */
1427                return i;
1428        }
1429        return 0;
1430}
1431
1432/* if new_name == NULL, the section is removed instead */
1433int git_config_rename_section(const char *old_name, const char *new_name)
1434{
1435        int ret = 0, remove = 0;
1436        char *config_filename;
1437        struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1438        int out_fd;
1439        char buf[1024];
1440
1441        if (config_exclusive_filename)
1442                config_filename = xstrdup(config_exclusive_filename);
1443        else
1444                config_filename = git_pathdup("config");
1445        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1446        if (out_fd < 0) {
1447                ret = error("could not lock config file %s", config_filename);
1448                goto out;
1449        }
1450
1451        if (!(config_file = fopen(config_filename, "rb"))) {
1452                /* no config file means nothing to rename, no error */
1453                goto unlock_and_out;
1454        }
1455
1456        while (fgets(buf, sizeof(buf), config_file)) {
1457                int i;
1458                int length;
1459                char *output = buf;
1460                for (i = 0; buf[i] && isspace(buf[i]); i++)
1461                        ; /* do nothing */
1462                if (buf[i] == '[') {
1463                        /* it's a section */
1464                        int offset = section_name_match(&buf[i], old_name);
1465                        if (offset > 0) {
1466                                ret++;
1467                                if (new_name == NULL) {
1468                                        remove = 1;
1469                                        continue;
1470                                }
1471                                store.baselen = strlen(new_name);
1472                                if (!store_write_section(out_fd, new_name)) {
1473                                        ret = write_error(lock->filename);
1474                                        goto out;
1475                                }
1476                                /*
1477                                 * We wrote out the new section, with
1478                                 * a newline, now skip the old
1479                                 * section's length
1480                                 */
1481                                output += offset + i;
1482                                if (strlen(output) > 0) {
1483                                        /*
1484                                         * More content means there's
1485                                         * a declaration to put on the
1486                                         * next line; indent with a
1487                                         * tab
1488                                         */
1489                                        output -= 1;
1490                                        output[0] = '\t';
1491                                }
1492                        }
1493                        remove = 0;
1494                }
1495                if (remove)
1496                        continue;
1497                length = strlen(output);
1498                if (write_in_full(out_fd, output, length) != length) {
1499                        ret = write_error(lock->filename);
1500                        goto out;
1501                }
1502        }
1503        fclose(config_file);
1504 unlock_and_out:
1505        if (commit_lock_file(lock) < 0)
1506                ret = error("could not commit config file %s", config_filename);
1507 out:
1508        free(config_filename);
1509        return ret;
1510}
1511
1512/*
1513 * Call this to report error for your variable that should not
1514 * get a boolean value (i.e. "[my] var" means "true").
1515 */
1516int config_error_nonbool(const char *var)
1517{
1518        return error("Missing value for '%s'", var);
1519}