Andrew's git / gitweb.git / config.c
?
config.con commit Update draft release notes to 1.7.7 (50963ba)
   1/*
   2 * GIT - The information manager from hell
   3 *
   4 * Copyright (C) Linus Torvalds, 2005
   5 * Copyright (C) Johannes Schindelin, 2005
   6 *
   7 */
   8#include "cache.h"
   9#include "exec_cmd.h"
  10#include "strbuf.h"
  11#include "quote.h"
  12
  13#define MAXNAME (256)
  14
  15typedef struct config_file {
  16        struct config_file *prev;
  17        FILE *f;
  18        const char *name;
  19        int linenr;
  20        int eof;
  21        struct strbuf value;
  22        char var[MAXNAME];
  23} config_file;
  24
  25static config_file *cf;
  26
  27static int zlib_compression_seen;
  28
  29const char *config_exclusive_filename = NULL;
  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                               config_fn_t fn, void *data)
  52{
  53        struct strbuf **pair;
  54        pair = strbuf_split_str(text, '=', 2);
  55        if (!pair[0])
  56                return error("bogus config parameter: %s", text);
  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 error("bogus config parameter: %s", text);
  63        }
  64        lowercase(pair[0]->buf);
  65        if (fn(pair[0]->buf, pair[1] ? pair[1]->buf : NULL, data) < 0) {
  66                strbuf_list_free(pair);
  67                return -1;
  68        }
  69        strbuf_list_free(pair);
  70        return 0;
  71}
  72
  73int git_config_from_parameters(config_fn_t fn, void *data)
  74{
  75        const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
  76        char *envw;
  77        const char **argv = NULL;
  78        int nr = 0, alloc = 0;
  79        int i;
  80
  81        if (!env)
  82                return 0;
  83        /* sq_dequote will write over it */
  84        envw = xstrdup(env);
  85
  86        if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
  87                free(envw);
  88                return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
  89        }
  90
  91        for (i = 0; i < nr; i++) {
  92                if (git_config_parse_parameter(argv[i], fn, data) < 0) {
  93                        free(argv);
  94                        free(envw);
  95                        return -1;
  96                }
  97        }
  98
  99        free(argv);
 100        free(envw);
 101        return nr > 0;
 102}
 103
 104static int get_next_char(void)
 105{
 106        int c;
 107        FILE *f;
 108
 109        c = '\n';
 110        if (cf && ((f = cf->f) != NULL)) {
 111                c = fgetc(f);
 112                if (c == '\r') {
 113                        /* DOS like systems */
 114                        c = fgetc(f);
 115                        if (c != '\n') {
 116                                ungetc(c, f);
 117                                c = '\r';
 118                        }
 119                }
 120                if (c == '\n')
 121                        cf->linenr++;
 122                if (c == EOF) {
 123                        cf->eof = 1;
 124                        c = '\n';
 125                }
 126        }
 127        return c;
 128}
 129
 130static char *parse_value(void)
 131{
 132        int quote = 0, comment = 0, space = 0;
 133
 134        strbuf_reset(&cf->value);
 135        for (;;) {
 136                int c = get_next_char();
 137                if (c == '\n') {
 138                        if (quote)
 139                                return NULL;
 140                        return cf->value.buf;
 141                }
 142                if (comment)
 143                        continue;
 144                if (isspace(c) && !quote) {
 145                        if (cf->value.len)
 146                                space++;
 147                        continue;
 148                }
 149                if (!quote) {
 150                        if (c == ';' || c == '#') {
 151                                comment = 1;
 152                                continue;
 153                        }
 154                }
 155                for (; space; space--)
 156                        strbuf_addch(&cf->value, ' ');
 157                if (c == '\\') {
 158                        c = get_next_char();
 159                        switch (c) {
 160                        case '\n':
 161                                continue;
 162                        case 't':
 163                                c = '\t';
 164                                break;
 165                        case 'b':
 166                                c = '\b';
 167                                break;
 168                        case 'n':
 169                                c = '\n';
 170                                break;
 171                        /* Some characters escape as themselves */
 172                        case '\\': case '"':
 173                                break;
 174                        /* Reject unknown escape sequences */
 175                        default:
 176                                return NULL;
 177                        }
 178                        strbuf_addch(&cf->value, c);
 179                        continue;
 180                }
 181                if (c == '"') {
 182                        quote = 1-quote;
 183                        continue;
 184                }
 185                strbuf_addch(&cf->value, c);
 186        }
 187}
 188
 189static inline int iskeychar(int c)
 190{
 191        return isalnum(c) || c == '-';
 192}
 193
 194static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)
 195{
 196        int c;
 197        char *value;
 198
 199        /* Get the full name */
 200        for (;;) {
 201                c = get_next_char();
 202                if (cf->eof)
 203                        break;
 204                if (!iskeychar(c))
 205                        break;
 206                name[len++] = tolower(c);
 207                if (len >= MAXNAME)
 208                        return -1;
 209        }
 210        name[len] = 0;
 211        while (c == ' ' || c == '\t')
 212                c = get_next_char();
 213
 214        value = NULL;
 215        if (c != '\n') {
 216                if (c != '=')
 217                        return -1;
 218                value = parse_value();
 219                if (!value)
 220                        return -1;
 221        }
 222        return fn(name, value, data);
 223}
 224
 225static int get_extended_base_var(char *name, int baselen, int c)
 226{
 227        do {
 228                if (c == '\n')
 229                        return -1;
 230                c = get_next_char();
 231        } while (isspace(c));
 232
 233        /* We require the format to be '[base "extension"]' */
 234        if (c != '"')
 235                return -1;
 236        name[baselen++] = '.';
 237
 238        for (;;) {
 239                int c = get_next_char();
 240                if (c == '\n')
 241                        return -1;
 242                if (c == '"')
 243                        break;
 244                if (c == '\\') {
 245                        c = get_next_char();
 246                        if (c == '\n')
 247                                return -1;
 248                }
 249                name[baselen++] = c;
 250                if (baselen > MAXNAME / 2)
 251                        return -1;
 252        }
 253
 254        /* Final ']' */
 255        if (get_next_char() != ']')
 256                return -1;
 257        return baselen;
 258}
 259
 260static int get_base_var(char *name)
 261{
 262        int baselen = 0;
 263
 264        for (;;) {
 265                int c = get_next_char();
 266                if (cf->eof)
 267                        return -1;
 268                if (c == ']')
 269                        return baselen;
 270                if (isspace(c))
 271                        return get_extended_base_var(name, baselen, c);
 272                if (!iskeychar(c) && c != '.')
 273                        return -1;
 274                if (baselen > MAXNAME / 2)
 275                        return -1;
 276                name[baselen++] = tolower(c);
 277        }
 278}
 279
 280static int git_parse_file(config_fn_t fn, void *data)
 281{
 282        int comment = 0;
 283        int baselen = 0;
 284        char *var = cf->var;
 285
 286        /* U+FEFF Byte Order Mark in UTF8 */
 287        static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
 288        const unsigned char *bomptr = utf8_bom;
 289
 290        for (;;) {
 291                int c = get_next_char();
 292                if (bomptr && *bomptr) {
 293                        /* We are at the file beginning; skip UTF8-encoded BOM
 294                         * if present. Sane editors won't put this in on their
 295                         * own, but e.g. Windows Notepad will do it happily. */
 296                        if ((unsigned char) c == *bomptr) {
 297                                bomptr++;
 298                                continue;
 299                        } else {
 300                                /* Do not tolerate partial BOM. */
 301                                if (bomptr != utf8_bom)
 302                                        break;
 303                                /* No BOM at file beginning. Cool. */
 304                                bomptr = NULL;
 305                        }
 306                }
 307                if (c == '\n') {
 308                        if (cf->eof)
 309                                return 0;
 310                        comment = 0;
 311                        continue;
 312                }
 313                if (comment || isspace(c))
 314                        continue;
 315                if (c == '#' || c == ';') {
 316                        comment = 1;
 317                        continue;
 318                }
 319                if (c == '[') {
 320                        baselen = get_base_var(var);
 321                        if (baselen <= 0)
 322                                break;
 323                        var[baselen++] = '.';
 324                        var[baselen] = 0;
 325                        continue;
 326                }
 327                if (!isalpha(c))
 328                        break;
 329                var[baselen] = tolower(c);
 330                if (get_value(fn, data, var, baselen+1) < 0)
 331                        break;
 332        }
 333        die("bad config file line %d in %s", cf->linenr, cf->name);
 334}
 335
 336static int parse_unit_factor(const char *end, unsigned long *val)
 337{
 338        if (!*end)
 339                return 1;
 340        else if (!strcasecmp(end, "k")) {
 341                *val *= 1024;
 342                return 1;
 343        }
 344        else if (!strcasecmp(end, "m")) {
 345                *val *= 1024 * 1024;
 346                return 1;
 347        }
 348        else if (!strcasecmp(end, "g")) {
 349                *val *= 1024 * 1024 * 1024;
 350                return 1;
 351        }
 352        return 0;
 353}
 354
 355static int git_parse_long(const char *value, long *ret)
 356{
 357        if (value && *value) {
 358                char *end;
 359                long val = strtol(value, &end, 0);
 360                unsigned long factor = 1;
 361                if (!parse_unit_factor(end, &factor))
 362                        return 0;
 363                *ret = val * factor;
 364                return 1;
 365        }
 366        return 0;
 367}
 368
 369int git_parse_ulong(const char *value, unsigned long *ret)
 370{
 371        if (value && *value) {
 372                char *end;
 373                unsigned long val = strtoul(value, &end, 0);
 374                if (!parse_unit_factor(end, &val))
 375                        return 0;
 376                *ret = val;
 377                return 1;
 378        }
 379        return 0;
 380}
 381
 382static void die_bad_config(const char *name)
 383{
 384        if (cf && cf->name)
 385                die("bad config value for '%s' in %s", name, cf->name);
 386        die("bad config value for '%s'", name);
 387}
 388
 389int git_config_int(const char *name, const char *value)
 390{
 391        long ret = 0;
 392        if (!git_parse_long(value, &ret))
 393                die_bad_config(name);
 394        return ret;
 395}
 396
 397unsigned long git_config_ulong(const char *name, const char *value)
 398{
 399        unsigned long ret;
 400        if (!git_parse_ulong(value, &ret))
 401                die_bad_config(name);
 402        return ret;
 403}
 404
 405static int git_config_maybe_bool_text(const char *name, const char *value)
 406{
 407        if (!value)
 408                return 1;
 409        if (!*value)
 410                return 0;
 411        if (!strcasecmp(value, "true")
 412            || !strcasecmp(value, "yes")
 413            || !strcasecmp(value, "on"))
 414                return 1;
 415        if (!strcasecmp(value, "false")
 416            || !strcasecmp(value, "no")
 417            || !strcasecmp(value, "off"))
 418                return 0;
 419        return -1;
 420}
 421
 422int git_config_maybe_bool(const char *name, const char *value)
 423{
 424        long v = git_config_maybe_bool_text(name, value);
 425        if (0 <= v)
 426                return v;
 427        if (git_parse_long(value, &v))
 428                return !!v;
 429        return -1;
 430}
 431
 432int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 433{
 434        int v = git_config_maybe_bool_text(name, value);
 435        if (0 <= v) {
 436                *is_bool = 1;
 437                return v;
 438        }
 439        *is_bool = 0;
 440        return git_config_int(name, value);
 441}
 442
 443int git_config_bool(const char *name, const char *value)
 444{
 445        int discard;
 446        return !!git_config_bool_or_int(name, value, &discard);
 447}
 448
 449int git_config_string(const char **dest, const char *var, const char *value)
 450{
 451        if (!value)
 452                return config_error_nonbool(var);
 453        *dest = xstrdup(value);
 454        return 0;
 455}
 456
 457int git_config_pathname(const char **dest, const char *var, const char *value)
 458{
 459        if (!value)
 460                return config_error_nonbool(var);
 461        *dest = expand_user_path(value);
 462        if (!*dest)
 463                die("Failed to expand user dir in: '%s'", value);
 464        return 0;
 465}
 466
 467static int git_default_core_config(const char *var, const char *value)
 468{
 469        /* This needs a better name */
 470        if (!strcmp(var, "core.filemode")) {
 471                trust_executable_bit = git_config_bool(var, value);
 472                return 0;
 473        }
 474        if (!strcmp(var, "core.trustctime")) {
 475                trust_ctime = git_config_bool(var, value);
 476                return 0;
 477        }
 478
 479        if (!strcmp(var, "core.quotepath")) {
 480                quote_path_fully = git_config_bool(var, value);
 481                return 0;
 482        }
 483
 484        if (!strcmp(var, "core.symlinks")) {
 485                has_symlinks = git_config_bool(var, value);
 486                return 0;
 487        }
 488
 489        if (!strcmp(var, "core.ignorecase")) {
 490                ignore_case = git_config_bool(var, value);
 491                return 0;
 492        }
 493
 494        if (!strcmp(var, "core.bare")) {
 495                is_bare_repository_cfg = git_config_bool(var, value);
 496                return 0;
 497        }
 498
 499        if (!strcmp(var, "core.ignorestat")) {
 500                assume_unchanged = git_config_bool(var, value);
 501                return 0;
 502        }
 503
 504        if (!strcmp(var, "core.prefersymlinkrefs")) {
 505                prefer_symlink_refs = git_config_bool(var, value);
 506                return 0;
 507        }
 508
 509        if (!strcmp(var, "core.logallrefupdates")) {
 510                log_all_ref_updates = git_config_bool(var, value);
 511                return 0;
 512        }
 513
 514        if (!strcmp(var, "core.warnambiguousrefs")) {
 515                warn_ambiguous_refs = git_config_bool(var, value);
 516                return 0;
 517        }
 518
 519        if (!strcmp(var, "core.abbrev")) {
 520                int abbrev = git_config_int(var, value);
 521                if (abbrev < minimum_abbrev || abbrev > 40)
 522                        return -1;
 523                default_abbrev = abbrev;
 524                return 0;
 525        }
 526
 527        if (!strcmp(var, "core.loosecompression")) {
 528                int level = git_config_int(var, value);
 529                if (level == -1)
 530                        level = Z_DEFAULT_COMPRESSION;
 531                else if (level < 0 || level > Z_BEST_COMPRESSION)
 532                        die("bad zlib compression level %d", level);
 533                zlib_compression_level = level;
 534                zlib_compression_seen = 1;
 535                return 0;
 536        }
 537
 538        if (!strcmp(var, "core.compression")) {
 539                int level = git_config_int(var, value);
 540                if (level == -1)
 541                        level = Z_DEFAULT_COMPRESSION;
 542                else if (level < 0 || level > Z_BEST_COMPRESSION)
 543                        die("bad zlib compression level %d", level);
 544                core_compression_level = level;
 545                core_compression_seen = 1;
 546                if (!zlib_compression_seen)
 547                        zlib_compression_level = level;
 548                return 0;
 549        }
 550
 551        if (!strcmp(var, "core.packedgitwindowsize")) {
 552                int pgsz_x2 = getpagesize() * 2;
 553                packed_git_window_size = git_config_int(var, value);
 554
 555                /* This value must be multiple of (pagesize * 2) */
 556                packed_git_window_size /= pgsz_x2;
 557                if (packed_git_window_size < 1)
 558                        packed_git_window_size = 1;
 559                packed_git_window_size *= pgsz_x2;
 560                return 0;
 561        }
 562
 563        if (!strcmp(var, "core.bigfilethreshold")) {
 564                long n = git_config_int(var, value);
 565                big_file_threshold = 0 < n ? n : 0;
 566                return 0;
 567        }
 568
 569        if (!strcmp(var, "core.packedgitlimit")) {
 570                packed_git_limit = git_config_int(var, value);
 571                return 0;
 572        }
 573
 574        if (!strcmp(var, "core.deltabasecachelimit")) {
 575                delta_base_cache_limit = git_config_int(var, value);
 576                return 0;
 577        }
 578
 579        if (!strcmp(var, "core.logpackaccess"))
 580                return git_config_string(&log_pack_access, var, value);
 581
 582        if (!strcmp(var, "core.autocrlf")) {
 583                if (value && !strcasecmp(value, "input")) {
 584                        if (core_eol == EOL_CRLF)
 585                                return error("core.autocrlf=input conflicts with core.eol=crlf");
 586                        auto_crlf = AUTO_CRLF_INPUT;
 587                        return 0;
 588                }
 589                auto_crlf = git_config_bool(var, value);
 590                return 0;
 591        }
 592
 593        if (!strcmp(var, "core.safecrlf")) {
 594                if (value && !strcasecmp(value, "warn")) {
 595                        safe_crlf = SAFE_CRLF_WARN;
 596                        return 0;
 597                }
 598                safe_crlf = git_config_bool(var, value);
 599                return 0;
 600        }
 601
 602        if (!strcmp(var, "core.eol")) {
 603                if (value && !strcasecmp(value, "lf"))
 604                        core_eol = EOL_LF;
 605                else if (value && !strcasecmp(value, "crlf"))
 606                        core_eol = EOL_CRLF;
 607                else if (value && !strcasecmp(value, "native"))
 608                        core_eol = EOL_NATIVE;
 609                else
 610                        core_eol = EOL_UNSET;
 611                if (core_eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 612                        return error("core.autocrlf=input conflicts with core.eol=crlf");
 613                return 0;
 614        }
 615
 616        if (!strcmp(var, "core.notesref")) {
 617                notes_ref_name = xstrdup(value);
 618                return 0;
 619        }
 620
 621        if (!strcmp(var, "core.pager"))
 622                return git_config_string(&pager_program, var, value);
 623
 624        if (!strcmp(var, "core.editor"))
 625                return git_config_string(&editor_program, var, value);
 626
 627        if (!strcmp(var, "core.askpass"))
 628                return git_config_string(&askpass_program, var, value);
 629
 630        if (!strcmp(var, "core.excludesfile"))
 631                return git_config_pathname(&excludes_file, var, value);
 632
 633        if (!strcmp(var, "core.whitespace")) {
 634                if (!value)
 635                        return config_error_nonbool(var);
 636                whitespace_rule_cfg = parse_whitespace_rule(value);
 637                return 0;
 638        }
 639
 640        if (!strcmp(var, "core.fsyncobjectfiles")) {
 641                fsync_object_files = git_config_bool(var, value);
 642                return 0;
 643        }
 644
 645        if (!strcmp(var, "core.preloadindex")) {
 646                core_preload_index = git_config_bool(var, value);
 647                return 0;
 648        }
 649
 650        if (!strcmp(var, "core.createobject")) {
 651                if (!strcmp(value, "rename"))
 652                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 653                else if (!strcmp(value, "link"))
 654                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 655                else
 656                        die("Invalid mode for object creation: %s", value);
 657                return 0;
 658        }
 659
 660        if (!strcmp(var, "core.sparsecheckout")) {
 661                core_apply_sparse_checkout = git_config_bool(var, value);
 662                return 0;
 663        }
 664
 665        /* Add other config variables here and to Documentation/config.txt. */
 666        return 0;
 667}
 668
 669static int git_default_user_config(const char *var, const char *value)
 670{
 671        if (!strcmp(var, "user.name")) {
 672                if (!value)
 673                        return config_error_nonbool(var);
 674                strlcpy(git_default_name, value, sizeof(git_default_name));
 675                user_ident_explicitly_given |= IDENT_NAME_GIVEN;
 676                return 0;
 677        }
 678
 679        if (!strcmp(var, "user.email")) {
 680                if (!value)
 681                        return config_error_nonbool(var);
 682                strlcpy(git_default_email, value, sizeof(git_default_email));
 683                user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 684                return 0;
 685        }
 686
 687        /* Add other config variables here and to Documentation/config.txt. */
 688        return 0;
 689}
 690
 691static int git_default_i18n_config(const char *var, const char *value)
 692{
 693        if (!strcmp(var, "i18n.commitencoding"))
 694                return git_config_string(&git_commit_encoding, var, value);
 695
 696        if (!strcmp(var, "i18n.logoutputencoding"))
 697                return git_config_string(&git_log_output_encoding, var, value);
 698
 699        /* Add other config variables here and to Documentation/config.txt. */
 700        return 0;
 701}
 702
 703static int git_default_branch_config(const char *var, const char *value)
 704{
 705        if (!strcmp(var, "branch.autosetupmerge")) {
 706                if (value && !strcasecmp(value, "always")) {
 707                        git_branch_track = BRANCH_TRACK_ALWAYS;
 708                        return 0;
 709                }
 710                git_branch_track = git_config_bool(var, value);
 711                return 0;
 712        }
 713        if (!strcmp(var, "branch.autosetuprebase")) {
 714                if (!value)
 715                        return config_error_nonbool(var);
 716                else if (!strcmp(value, "never"))
 717                        autorebase = AUTOREBASE_NEVER;
 718                else if (!strcmp(value, "local"))
 719                        autorebase = AUTOREBASE_LOCAL;
 720                else if (!strcmp(value, "remote"))
 721                        autorebase = AUTOREBASE_REMOTE;
 722                else if (!strcmp(value, "always"))
 723                        autorebase = AUTOREBASE_ALWAYS;
 724                else
 725                        return error("Malformed value for %s", var);
 726                return 0;
 727        }
 728
 729        /* Add other config variables here and to Documentation/config.txt. */
 730        return 0;
 731}
 732
 733static int git_default_push_config(const char *var, const char *value)
 734{
 735        if (!strcmp(var, "push.default")) {
 736                if (!value)
 737                        return config_error_nonbool(var);
 738                else if (!strcmp(value, "nothing"))
 739                        push_default = PUSH_DEFAULT_NOTHING;
 740                else if (!strcmp(value, "matching"))
 741                        push_default = PUSH_DEFAULT_MATCHING;
 742                else if (!strcmp(value, "upstream"))
 743                        push_default = PUSH_DEFAULT_UPSTREAM;
 744                else if (!strcmp(value, "tracking")) /* deprecated */
 745                        push_default = PUSH_DEFAULT_UPSTREAM;
 746                else if (!strcmp(value, "current"))
 747                        push_default = PUSH_DEFAULT_CURRENT;
 748                else {
 749                        error("Malformed value for %s: %s", var, value);
 750                        return error("Must be one of nothing, matching, "
 751                                     "tracking or current.");
 752                }
 753                return 0;
 754        }
 755
 756        /* Add other config variables here and to Documentation/config.txt. */
 757        return 0;
 758}
 759
 760static int git_default_mailmap_config(const char *var, const char *value)
 761{
 762        if (!strcmp(var, "mailmap.file"))
 763                return git_config_string(&git_mailmap_file, var, value);
 764
 765        /* Add other config variables here and to Documentation/config.txt. */
 766        return 0;
 767}
 768
 769int git_default_config(const char *var, const char *value, void *dummy)
 770{
 771        if (!prefixcmp(var, "core."))
 772                return git_default_core_config(var, value);
 773
 774        if (!prefixcmp(var, "user."))
 775                return git_default_user_config(var, value);
 776
 777        if (!prefixcmp(var, "i18n."))
 778                return git_default_i18n_config(var, value);
 779
 780        if (!prefixcmp(var, "branch."))
 781                return git_default_branch_config(var, value);
 782
 783        if (!prefixcmp(var, "push."))
 784                return git_default_push_config(var, value);
 785
 786        if (!prefixcmp(var, "mailmap."))
 787                return git_default_mailmap_config(var, value);
 788
 789        if (!prefixcmp(var, "advice."))
 790                return git_default_advice_config(var, value);
 791
 792        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 793                pager_use_color = git_config_bool(var,value);
 794                return 0;
 795        }
 796
 797        /* Add other config variables here and to Documentation/config.txt. */
 798        return 0;
 799}
 800
 801int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 802{
 803        int ret;
 804        FILE *f = fopen(filename, "r");
 805
 806        ret = -1;
 807        if (f) {
 808                config_file top;
 809
 810                /* push config-file parsing state stack */
 811                top.prev = cf;
 812                top.f = f;
 813                top.name = filename;
 814                top.linenr = 1;
 815                top.eof = 0;
 816                strbuf_init(&top.value, 1024);
 817                cf = &top;
 818
 819                ret = git_parse_file(fn, data);
 820
 821                /* pop config-file parsing state stack */
 822                strbuf_release(&top.value);
 823                cf = top.prev;
 824
 825                fclose(f);
 826        }
 827        return ret;
 828}
 829
 830const char *git_etc_gitconfig(void)
 831{
 832        static const char *system_wide;
 833        if (!system_wide)
 834                system_wide = system_path(ETC_GITCONFIG);
 835        return system_wide;
 836}
 837
 838int git_env_bool(const char *k, int def)
 839{
 840        const char *v = getenv(k);
 841        return v ? git_config_bool(k, v) : def;
 842}
 843
 844int git_config_system(void)
 845{
 846        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 847}
 848
 849int git_config_early(config_fn_t fn, void *data, const char *repo_config)
 850{
 851        int ret = 0, found = 0;
 852        const char *home = NULL;
 853
 854        /* Setting $GIT_CONFIG makes git read _only_ the given config file. */
 855        if (config_exclusive_filename)
 856                return git_config_from_file(fn, config_exclusive_filename, data);
 857        if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
 858                ret += git_config_from_file(fn, git_etc_gitconfig(),
 859                                            data);
 860                found += 1;
 861        }
 862
 863        home = getenv("HOME");
 864        if (home) {
 865                char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
 866                if (!access(user_config, R_OK)) {
 867                        ret += git_config_from_file(fn, user_config, data);
 868                        found += 1;
 869                }
 870                free(user_config);
 871        }
 872
 873        if (repo_config && !access(repo_config, R_OK)) {
 874                ret += git_config_from_file(fn, repo_config, data);
 875                found += 1;
 876        }
 877
 878        switch (git_config_from_parameters(fn, data)) {
 879        case -1: /* error */
 880                die("unable to parse command-line config");
 881                break;
 882        case 0: /* found nothing */
 883                break;
 884        default: /* found at least one item */
 885                found++;
 886                break;
 887        }
 888
 889        return ret == 0 ? found : ret;
 890}
 891
 892int git_config(config_fn_t fn, void *data)
 893{
 894        char *repo_config = NULL;
 895        int ret;
 896
 897        repo_config = git_pathdup("config");
 898        ret = git_config_early(fn, data, repo_config);
 899        if (repo_config)
 900                free(repo_config);
 901        return ret;
 902}
 903
 904/*
 905 * Find all the stuff for git_config_set() below.
 906 */
 907
 908#define MAX_MATCHES 512
 909
 910static struct {
 911        int baselen;
 912        char *key;
 913        int do_not_match;
 914        regex_t *value_regex;
 915        int multi_replace;
 916        size_t offset[MAX_MATCHES];
 917        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
 918        int seen;
 919} store;
 920
 921static int matches(const char *key, const char *value)
 922{
 923        return !strcmp(key, store.key) &&
 924                (store.value_regex == NULL ||
 925                 (store.do_not_match ^
 926                  !regexec(store.value_regex, value, 0, NULL, 0)));
 927}
 928
 929static int store_aux(const char *key, const char *value, void *cb)
 930{
 931        const char *ep;
 932        size_t section_len;
 933        FILE *f = cf->f;
 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(f);
 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(f);
 973                /* fallthru */
 974        case SECTION_END_SEEN:
 975        case START:
 976                if (matches(key, value)) {
 977                        store.offset[store.seen] = ftell(f);
 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(f);
 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 -CONFIG_NO_SECTION_OR_NAME;
1128        }
1129
1130        if (!last_dot[1]) {
1131                error("key does not contain variable name: %s", key);
1132                return -CONFIG_NO_SECTION_OR_NAME;
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 -CONFIG_INVALID_KEY;
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 = CONFIG_NO_LOCK;
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 = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1240                        goto out_free;
1241                }
1242                /* if nothing to unset, error out */
1243                if (value == NULL) {
1244                        ret = CONFIG_NOTHING_SET;
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 = CONFIG_INVALID_PATTERN;
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 = CONFIG_INVALID_FILE;
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 = CONFIG_NOTHING_SET;
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 = CONFIG_NO_WRITE;
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        FILE *config_file;
1441
1442        if (config_exclusive_filename)
1443                config_filename = xstrdup(config_exclusive_filename);
1444        else
1445                config_filename = git_pathdup("config");
1446        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1447        if (out_fd < 0) {
1448                ret = error("could not lock config file %s", config_filename);
1449                goto out;
1450        }
1451
1452        if (!(config_file = fopen(config_filename, "rb"))) {
1453                /* no config file means nothing to rename, no error */
1454                goto unlock_and_out;
1455        }
1456
1457        while (fgets(buf, sizeof(buf), config_file)) {
1458                int i;
1459                int length;
1460                char *output = buf;
1461                for (i = 0; buf[i] && isspace(buf[i]); i++)
1462                        ; /* do nothing */
1463                if (buf[i] == '[') {
1464                        /* it's a section */
1465                        int offset = section_name_match(&buf[i], old_name);
1466                        if (offset > 0) {
1467                                ret++;
1468                                if (new_name == NULL) {
1469                                        remove = 1;
1470                                        continue;
1471                                }
1472                                store.baselen = strlen(new_name);
1473                                if (!store_write_section(out_fd, new_name)) {
1474                                        ret = write_error(lock->filename);
1475                                        goto out;
1476                                }
1477                                /*
1478                                 * We wrote out the new section, with
1479                                 * a newline, now skip the old
1480                                 * section's length
1481                                 */
1482                                output += offset + i;
1483                                if (strlen(output) > 0) {
1484                                        /*
1485                                         * More content means there's
1486                                         * a declaration to put on the
1487                                         * next line; indent with a
1488                                         * tab
1489                                         */
1490                                        output -= 1;
1491                                        output[0] = '\t';
1492                                }
1493                        }
1494                        remove = 0;
1495                }
1496                if (remove)
1497                        continue;
1498                length = strlen(output);
1499                if (write_in_full(out_fd, output, length) != length) {
1500                        ret = write_error(lock->filename);
1501                        goto out;
1502                }
1503        }
1504        fclose(config_file);
1505unlock_and_out:
1506        if (commit_lock_file(lock) < 0)
1507                ret = error("could not commit config file %s", config_filename);
1508out:
1509        free(config_filename);
1510        return ret;
1511}
1512
1513/*
1514 * Call this to report error for your variable that should not
1515 * get a boolean value (i.e. "[my] var" means "true").
1516 */
1517int config_error_nonbool(const char *var)
1518{
1519        return error("Missing value for '%s'", var);
1520}