Andrew's git / gitweb.git / config.c
?
config.con commit Merge branch 'jc/maint-diff-q-filter' (7d0cf35)
   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.loosecompression")) {
 527                int level = git_config_int(var, value);
 528                if (level == -1)
 529                        level = Z_DEFAULT_COMPRESSION;
 530                else if (level < 0 || level > Z_BEST_COMPRESSION)
 531                        die("bad zlib compression level %d", level);
 532                zlib_compression_level = level;
 533                zlib_compression_seen = 1;
 534                return 0;
 535        }
 536
 537        if (!strcmp(var, "core.compression")) {
 538                int level = git_config_int(var, value);
 539                if (level == -1)
 540                        level = Z_DEFAULT_COMPRESSION;
 541                else if (level < 0 || level > Z_BEST_COMPRESSION)
 542                        die("bad zlib compression level %d", level);
 543                core_compression_level = level;
 544                core_compression_seen = 1;
 545                if (!zlib_compression_seen)
 546                        zlib_compression_level = level;
 547                return 0;
 548        }
 549
 550        if (!strcmp(var, "core.packedgitwindowsize")) {
 551                int pgsz_x2 = getpagesize() * 2;
 552                packed_git_window_size = git_config_int(var, value);
 553
 554                /* This value must be multiple of (pagesize * 2) */
 555                packed_git_window_size /= pgsz_x2;
 556                if (packed_git_window_size < 1)
 557                        packed_git_window_size = 1;
 558                packed_git_window_size *= pgsz_x2;
 559                return 0;
 560        }
 561
 562        if (!strcmp(var, "core.packedgitlimit")) {
 563                packed_git_limit = git_config_int(var, value);
 564                return 0;
 565        }
 566
 567        if (!strcmp(var, "core.deltabasecachelimit")) {
 568                delta_base_cache_limit = git_config_int(var, value);
 569                return 0;
 570        }
 571
 572        if (!strcmp(var, "core.autocrlf")) {
 573                if (value && !strcasecmp(value, "input")) {
 574                        if (eol == EOL_CRLF)
 575                                return error("core.autocrlf=input conflicts with core.eol=crlf");
 576                        auto_crlf = AUTO_CRLF_INPUT;
 577                        return 0;
 578                }
 579                auto_crlf = git_config_bool(var, value);
 580                return 0;
 581        }
 582
 583        if (!strcmp(var, "core.safecrlf")) {
 584                if (value && !strcasecmp(value, "warn")) {
 585                        safe_crlf = SAFE_CRLF_WARN;
 586                        return 0;
 587                }
 588                safe_crlf = git_config_bool(var, value);
 589                return 0;
 590        }
 591
 592        if (!strcmp(var, "core.eol")) {
 593                if (value && !strcasecmp(value, "lf"))
 594                        eol = EOL_LF;
 595                else if (value && !strcasecmp(value, "crlf"))
 596                        eol = EOL_CRLF;
 597                else if (value && !strcasecmp(value, "native"))
 598                        eol = EOL_NATIVE;
 599                else
 600                        eol = EOL_UNSET;
 601                if (eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 602                        return error("core.autocrlf=input conflicts with core.eol=crlf");
 603                return 0;
 604        }
 605
 606        if (!strcmp(var, "core.notesref")) {
 607                notes_ref_name = xstrdup(value);
 608                return 0;
 609        }
 610
 611        if (!strcmp(var, "core.pager"))
 612                return git_config_string(&pager_program, var, value);
 613
 614        if (!strcmp(var, "core.editor"))
 615                return git_config_string(&editor_program, var, value);
 616
 617        if (!strcmp(var, "core.askpass"))
 618                return git_config_string(&askpass_program, var, value);
 619
 620        if (!strcmp(var, "core.excludesfile"))
 621                return git_config_pathname(&excludes_file, var, value);
 622
 623        if (!strcmp(var, "core.whitespace")) {
 624                if (!value)
 625                        return config_error_nonbool(var);
 626                whitespace_rule_cfg = parse_whitespace_rule(value);
 627                return 0;
 628        }
 629
 630        if (!strcmp(var, "core.fsyncobjectfiles")) {
 631                fsync_object_files = git_config_bool(var, value);
 632                return 0;
 633        }
 634
 635        if (!strcmp(var, "core.preloadindex")) {
 636                core_preload_index = git_config_bool(var, value);
 637                return 0;
 638        }
 639
 640        if (!strcmp(var, "core.createobject")) {
 641                if (!strcmp(value, "rename"))
 642                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 643                else if (!strcmp(value, "link"))
 644                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 645                else
 646                        die("Invalid mode for object creation: %s", value);
 647                return 0;
 648        }
 649
 650        if (!strcmp(var, "core.sparsecheckout")) {
 651                core_apply_sparse_checkout = git_config_bool(var, value);
 652                return 0;
 653        }
 654
 655        /* Add other config variables here and to Documentation/config.txt. */
 656        return 0;
 657}
 658
 659static int git_default_user_config(const char *var, const char *value)
 660{
 661        if (!strcmp(var, "user.name")) {
 662                if (!value)
 663                        return config_error_nonbool(var);
 664                strlcpy(git_default_name, value, sizeof(git_default_name));
 665                user_ident_explicitly_given |= IDENT_NAME_GIVEN;
 666                return 0;
 667        }
 668
 669        if (!strcmp(var, "user.email")) {
 670                if (!value)
 671                        return config_error_nonbool(var);
 672                strlcpy(git_default_email, value, sizeof(git_default_email));
 673                user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 674                return 0;
 675        }
 676
 677        /* Add other config variables here and to Documentation/config.txt. */
 678        return 0;
 679}
 680
 681static int git_default_i18n_config(const char *var, const char *value)
 682{
 683        if (!strcmp(var, "i18n.commitencoding"))
 684                return git_config_string(&git_commit_encoding, var, value);
 685
 686        if (!strcmp(var, "i18n.logoutputencoding"))
 687                return git_config_string(&git_log_output_encoding, var, value);
 688
 689        /* Add other config variables here and to Documentation/config.txt. */
 690        return 0;
 691}
 692
 693static int git_default_branch_config(const char *var, const char *value)
 694{
 695        if (!strcmp(var, "branch.autosetupmerge")) {
 696                if (value && !strcasecmp(value, "always")) {
 697                        git_branch_track = BRANCH_TRACK_ALWAYS;
 698                        return 0;
 699                }
 700                git_branch_track = git_config_bool(var, value);
 701                return 0;
 702        }
 703        if (!strcmp(var, "branch.autosetuprebase")) {
 704                if (!value)
 705                        return config_error_nonbool(var);
 706                else if (!strcmp(value, "never"))
 707                        autorebase = AUTOREBASE_NEVER;
 708                else if (!strcmp(value, "local"))
 709                        autorebase = AUTOREBASE_LOCAL;
 710                else if (!strcmp(value, "remote"))
 711                        autorebase = AUTOREBASE_REMOTE;
 712                else if (!strcmp(value, "always"))
 713                        autorebase = AUTOREBASE_ALWAYS;
 714                else
 715                        return error("Malformed value for %s", var);
 716                return 0;
 717        }
 718
 719        /* Add other config variables here and to Documentation/config.txt. */
 720        return 0;
 721}
 722
 723static int git_default_push_config(const char *var, const char *value)
 724{
 725        if (!strcmp(var, "push.default")) {
 726                if (!value)
 727                        return config_error_nonbool(var);
 728                else if (!strcmp(value, "nothing"))
 729                        push_default = PUSH_DEFAULT_NOTHING;
 730                else if (!strcmp(value, "matching"))
 731                        push_default = PUSH_DEFAULT_MATCHING;
 732                else if (!strcmp(value, "upstream"))
 733                        push_default = PUSH_DEFAULT_UPSTREAM;
 734                else if (!strcmp(value, "tracking")) /* deprecated */
 735                        push_default = PUSH_DEFAULT_UPSTREAM;
 736                else if (!strcmp(value, "current"))
 737                        push_default = PUSH_DEFAULT_CURRENT;
 738                else {
 739                        error("Malformed value for %s: %s", var, value);
 740                        return error("Must be one of nothing, matching, "
 741                                     "tracking or current.");
 742                }
 743                return 0;
 744        }
 745
 746        /* Add other config variables here and to Documentation/config.txt. */
 747        return 0;
 748}
 749
 750static int git_default_mailmap_config(const char *var, const char *value)
 751{
 752        if (!strcmp(var, "mailmap.file"))
 753                return git_config_string(&git_mailmap_file, var, value);
 754
 755        /* Add other config variables here and to Documentation/config.txt. */
 756        return 0;
 757}
 758
 759int git_default_config(const char *var, const char *value, void *dummy)
 760{
 761        if (!prefixcmp(var, "core."))
 762                return git_default_core_config(var, value);
 763
 764        if (!prefixcmp(var, "user."))
 765                return git_default_user_config(var, value);
 766
 767        if (!prefixcmp(var, "i18n."))
 768                return git_default_i18n_config(var, value);
 769
 770        if (!prefixcmp(var, "branch."))
 771                return git_default_branch_config(var, value);
 772
 773        if (!prefixcmp(var, "push."))
 774                return git_default_push_config(var, value);
 775
 776        if (!prefixcmp(var, "mailmap."))
 777                return git_default_mailmap_config(var, value);
 778
 779        if (!prefixcmp(var, "advice."))
 780                return git_default_advice_config(var, value);
 781
 782        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 783                pager_use_color = git_config_bool(var,value);
 784                return 0;
 785        }
 786
 787        /* Add other config variables here and to Documentation/config.txt. */
 788        return 0;
 789}
 790
 791int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 792{
 793        int ret;
 794        FILE *f = fopen(filename, "r");
 795
 796        ret = -1;
 797        if (f) {
 798                config_file = f;
 799                config_file_name = filename;
 800                config_linenr = 1;
 801                config_file_eof = 0;
 802                ret = git_parse_file(fn, data);
 803                fclose(f);
 804                config_file_name = NULL;
 805        }
 806        return ret;
 807}
 808
 809const char *git_etc_gitconfig(void)
 810{
 811        static const char *system_wide;
 812        if (!system_wide)
 813                system_wide = system_path(ETC_GITCONFIG);
 814        return system_wide;
 815}
 816
 817int git_env_bool(const char *k, int def)
 818{
 819        const char *v = getenv(k);
 820        return v ? git_config_bool(k, v) : def;
 821}
 822
 823int git_config_system(void)
 824{
 825        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 826}
 827
 828int git_config_from_parameters(config_fn_t fn, void *data)
 829{
 830        static int loaded_environment;
 831        const struct config_item *ct;
 832
 833        if (!loaded_environment) {
 834                if (git_config_parse_environment() < 0)
 835                        return -1;
 836                loaded_environment = 1;
 837        }
 838        for (ct = config_parameters; ct; ct = ct->next)
 839                if (fn(ct->name, ct->value, data) < 0)
 840                        return -1;
 841        return 0;
 842}
 843
 844int git_config_early(config_fn_t fn, void *data, const char *repo_config)
 845{
 846        int ret = 0, found = 0;
 847        const char *home = NULL;
 848
 849        /* Setting $GIT_CONFIG makes git read _only_ the given config file. */
 850        if (config_exclusive_filename)
 851                return git_config_from_file(fn, config_exclusive_filename, data);
 852        if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
 853                ret += git_config_from_file(fn, git_etc_gitconfig(),
 854                                            data);
 855                found += 1;
 856        }
 857
 858        home = getenv("HOME");
 859        if (home) {
 860                char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
 861                if (!access(user_config, R_OK)) {
 862                        ret += git_config_from_file(fn, user_config, data);
 863                        found += 1;
 864                }
 865                free(user_config);
 866        }
 867
 868        if (repo_config && !access(repo_config, R_OK)) {
 869                ret += git_config_from_file(fn, repo_config, data);
 870                found += 1;
 871        }
 872
 873        ret += git_config_from_parameters(fn, data);
 874        if (config_parameters)
 875                found += 1;
 876
 877        return ret == 0 ? found : ret;
 878}
 879
 880int git_config(config_fn_t fn, void *data)
 881{
 882        char *repo_config = NULL;
 883        int ret;
 884
 885        repo_config = git_pathdup("config");
 886        ret = git_config_early(fn, data, repo_config);
 887        if (repo_config)
 888                free(repo_config);
 889        return ret;
 890}
 891
 892/*
 893 * Find all the stuff for git_config_set() below.
 894 */
 895
 896#define MAX_MATCHES 512
 897
 898static struct {
 899        int baselen;
 900        char *key;
 901        int do_not_match;
 902        regex_t *value_regex;
 903        int multi_replace;
 904        size_t offset[MAX_MATCHES];
 905        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
 906        int seen;
 907} store;
 908
 909static int matches(const char *key, const char *value)
 910{
 911        return !strcmp(key, store.key) &&
 912                (store.value_regex == NULL ||
 913                 (store.do_not_match ^
 914                  !regexec(store.value_regex, value, 0, NULL, 0)));
 915}
 916
 917static int store_aux(const char *key, const char *value, void *cb)
 918{
 919        const char *ep;
 920        size_t section_len;
 921
 922        switch (store.state) {
 923        case KEY_SEEN:
 924                if (matches(key, value)) {
 925                        if (store.seen == 1 && store.multi_replace == 0) {
 926                                warning("%s has multiple values", key);
 927                        } else if (store.seen >= MAX_MATCHES) {
 928                                error("too many matches for %s", key);
 929                                return 1;
 930                        }
 931
 932                        store.offset[store.seen] = ftell(config_file);
 933                        store.seen++;
 934                }
 935                break;
 936        case SECTION_SEEN:
 937                /*
 938                 * What we are looking for is in store.key (both
 939                 * section and var), and its section part is baselen
 940                 * long.  We found key (again, both section and var).
 941                 * We would want to know if this key is in the same
 942                 * section as what we are looking for.  We already
 943                 * know we are in the same section as what should
 944                 * hold store.key.
 945                 */
 946                ep = strrchr(key, '.');
 947                section_len = ep - key;
 948
 949                if ((section_len != store.baselen) ||
 950                    memcmp(key, store.key, section_len+1)) {
 951                        store.state = SECTION_END_SEEN;
 952                        break;
 953                }
 954
 955                /*
 956                 * Do not increment matches: this is no match, but we
 957                 * just made sure we are in the desired section.
 958                 */
 959                store.offset[store.seen] = ftell(config_file);
 960                /* fallthru */
 961        case SECTION_END_SEEN:
 962        case START:
 963                if (matches(key, value)) {
 964                        store.offset[store.seen] = ftell(config_file);
 965                        store.state = KEY_SEEN;
 966                        store.seen++;
 967                } else {
 968                        if (strrchr(key, '.') - key == store.baselen &&
 969                              !strncmp(key, store.key, store.baselen)) {
 970                                        store.state = SECTION_SEEN;
 971                                        store.offset[store.seen] = ftell(config_file);
 972                        }
 973                }
 974        }
 975        return 0;
 976}
 977
 978static int write_error(const char *filename)
 979{
 980        error("failed to write new configuration file %s", filename);
 981
 982        /* Same error code as "failed to rename". */
 983        return 4;
 984}
 985
 986static int store_write_section(int fd, const char *key)
 987{
 988        const char *dot;
 989        int i, success;
 990        struct strbuf sb = STRBUF_INIT;
 991
 992        dot = memchr(key, '.', store.baselen);
 993        if (dot) {
 994                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
 995                for (i = dot - key + 1; i < store.baselen; i++) {
 996                        if (key[i] == '"' || key[i] == '\\')
 997                                strbuf_addch(&sb, '\\');
 998                        strbuf_addch(&sb, key[i]);
 999                }
1000                strbuf_addstr(&sb, "\"]\n");
1001        } else {
1002                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1003        }
1004
1005        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1006        strbuf_release(&sb);
1007
1008        return success;
1009}
1010
1011static int store_write_pair(int fd, const char *key, const char *value)
1012{
1013        int i, success;
1014        int length = strlen(key + store.baselen + 1);
1015        const char *quote = "";
1016        struct strbuf sb = STRBUF_INIT;
1017
1018        /*
1019         * Check to see if the value needs to be surrounded with a dq pair.
1020         * Note that problematic characters are always backslash-quoted; this
1021         * check is about not losing leading or trailing SP and strings that
1022         * follow beginning-of-comment characters (i.e. ';' and '#') by the
1023         * configuration parser.
1024         */
1025        if (value[0] == ' ')
1026                quote = "\"";
1027        for (i = 0; value[i]; i++)
1028                if (value[i] == ';' || value[i] == '#')
1029                        quote = "\"";
1030        if (i && value[i - 1] == ' ')
1031                quote = "\"";
1032
1033        strbuf_addf(&sb, "\t%.*s = %s",
1034                    length, key + store.baselen + 1, quote);
1035
1036        for (i = 0; value[i]; i++)
1037                switch (value[i]) {
1038                case '\n':
1039                        strbuf_addstr(&sb, "\\n");
1040                        break;
1041                case '\t':
1042                        strbuf_addstr(&sb, "\\t");
1043                        break;
1044                case '"':
1045                case '\\':
1046                        strbuf_addch(&sb, '\\');
1047                default:
1048                        strbuf_addch(&sb, value[i]);
1049                        break;
1050                }
1051        strbuf_addf(&sb, "%s\n", quote);
1052
1053        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1054        strbuf_release(&sb);
1055
1056        return success;
1057}
1058
1059static ssize_t find_beginning_of_line(const char *contents, size_t size,
1060        size_t offset_, int *found_bracket)
1061{
1062        size_t equal_offset = size, bracket_offset = size;
1063        ssize_t offset;
1064
1065contline:
1066        for (offset = offset_-2; offset > 0
1067                        && contents[offset] != '\n'; offset--)
1068                switch (contents[offset]) {
1069                        case '=': equal_offset = offset; break;
1070                        case ']': bracket_offset = offset; break;
1071                }
1072        if (offset > 0 && contents[offset-1] == '\\') {
1073                offset_ = offset;
1074                goto contline;
1075        }
1076        if (bracket_offset < equal_offset) {
1077                *found_bracket = 1;
1078                offset = bracket_offset+1;
1079        } else
1080                offset++;
1081
1082        return offset;
1083}
1084
1085int git_config_set(const char *key, const char *value)
1086{
1087        return git_config_set_multivar(key, value, NULL, 0);
1088}
1089
1090/*
1091 * Auxiliary function to sanity-check and split the key into the section
1092 * identifier and variable name.
1093 *
1094 * Returns 0 on success, -1 when there is an invalid character in the key and
1095 * -2 if there is no section name in the key.
1096 *
1097 * store_key - pointer to char* which will hold a copy of the key with
1098 *             lowercase section and variable name
1099 * baselen - pointer to int which will hold the length of the
1100 *           section + subsection part, can be NULL
1101 */
1102int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1103{
1104        int i, dot, baselen;
1105        const char *last_dot = strrchr(key, '.');
1106
1107        /*
1108         * Since "key" actually contains the section name and the real
1109         * key name separated by a dot, we have to know where the dot is.
1110         */
1111
1112        if (last_dot == NULL || last_dot == key) {
1113                error("key does not contain a section: %s", key);
1114                return -2;
1115        }
1116
1117        if (!last_dot[1]) {
1118                error("key does not contain variable name: %s", key);
1119                return -2;
1120        }
1121
1122        baselen = last_dot - key;
1123        if (baselen_)
1124                *baselen_ = baselen;
1125
1126        /*
1127         * Validate the key and while at it, lower case it for matching.
1128         */
1129        *store_key = xmalloc(strlen(key) + 1);
1130
1131        dot = 0;
1132        for (i = 0; key[i]; i++) {
1133                unsigned char c = key[i];
1134                if (c == '.')
1135                        dot = 1;
1136                /* Leave the extended basename untouched.. */
1137                if (!dot || i > baselen) {
1138                        if (!iskeychar(c) ||
1139                            (i == baselen + 1 && !isalpha(c))) {
1140                                error("invalid key: %s", key);
1141                                goto out_free_ret_1;
1142                        }
1143                        c = tolower(c);
1144                } else if (c == '\n') {
1145                        error("invalid key (newline): %s", key);
1146                        goto out_free_ret_1;
1147                }
1148                (*store_key)[i] = c;
1149        }
1150        (*store_key)[i] = 0;
1151
1152        return 0;
1153
1154out_free_ret_1:
1155        free(*store_key);
1156        return -1;
1157}
1158
1159/*
1160 * If value==NULL, unset in (remove from) config,
1161 * if value_regex!=NULL, disregard key/value pairs where value does not match.
1162 * if multi_replace==0, nothing, or only one matching key/value is replaced,
1163 *     else all matching key/values (regardless how many) are removed,
1164 *     before the new pair is written.
1165 *
1166 * Returns 0 on success.
1167 *
1168 * This function does this:
1169 *
1170 * - it locks the config file by creating ".git/config.lock"
1171 *
1172 * - it then parses the config using store_aux() as validator to find
1173 *   the position on the key/value pair to replace. If it is to be unset,
1174 *   it must be found exactly once.
1175 *
1176 * - the config file is mmap()ed and the part before the match (if any) is
1177 *   written to the lock file, then the changed part and the rest.
1178 *
1179 * - the config file is removed and the lock file rename()d to it.
1180 *
1181 */
1182int git_config_set_multivar(const char *key, const char *value,
1183        const char *value_regex, int multi_replace)
1184{
1185        int fd = -1, in_fd;
1186        int ret;
1187        char *config_filename;
1188        struct lock_file *lock = NULL;
1189
1190        if (config_exclusive_filename)
1191                config_filename = xstrdup(config_exclusive_filename);
1192        else
1193                config_filename = git_pathdup("config");
1194
1195        /* parse-key returns negative; flip the sign to feed exit(3) */
1196        ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1197        if (ret)
1198                goto out_free;
1199
1200        store.multi_replace = multi_replace;
1201
1202
1203        /*
1204         * The lock serves a purpose in addition to locking: the new
1205         * contents of .git/config will be written into it.
1206         */
1207        lock = xcalloc(sizeof(struct lock_file), 1);
1208        fd = hold_lock_file_for_update(lock, config_filename, 0);
1209        if (fd < 0) {
1210                error("could not lock config file %s: %s", config_filename, strerror(errno));
1211                free(store.key);
1212                ret = -1;
1213                goto out_free;
1214        }
1215
1216        /*
1217         * If .git/config does not exist yet, write a minimal version.
1218         */
1219        in_fd = open(config_filename, O_RDONLY);
1220        if ( in_fd < 0 ) {
1221                free(store.key);
1222
1223                if ( ENOENT != errno ) {
1224                        error("opening %s: %s", config_filename,
1225                              strerror(errno));
1226                        ret = 3; /* same as "invalid config file" */
1227                        goto out_free;
1228                }
1229                /* if nothing to unset, error out */
1230                if (value == NULL) {
1231                        ret = 5;
1232                        goto out_free;
1233                }
1234
1235                store.key = (char *)key;
1236                if (!store_write_section(fd, key) ||
1237                    !store_write_pair(fd, key, value))
1238                        goto write_err_out;
1239        } else {
1240                struct stat st;
1241                char *contents;
1242                size_t contents_sz, copy_begin, copy_end;
1243                int i, new_line = 0;
1244
1245                if (value_regex == NULL)
1246                        store.value_regex = NULL;
1247                else {
1248                        if (value_regex[0] == '!') {
1249                                store.do_not_match = 1;
1250                                value_regex++;
1251                        } else
1252                                store.do_not_match = 0;
1253
1254                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1255                        if (regcomp(store.value_regex, value_regex,
1256                                        REG_EXTENDED)) {
1257                                error("invalid pattern: %s", value_regex);
1258                                free(store.value_regex);
1259                                ret = 6;
1260                                goto out_free;
1261                        }
1262                }
1263
1264                store.offset[0] = 0;
1265                store.state = START;
1266                store.seen = 0;
1267
1268                /*
1269                 * After this, store.offset will contain the *end* offset
1270                 * of the last match, or remain at 0 if no match was found.
1271                 * As a side effect, we make sure to transform only a valid
1272                 * existing config file.
1273                 */
1274                if (git_config_from_file(store_aux, config_filename, NULL)) {
1275                        error("invalid config file %s", config_filename);
1276                        free(store.key);
1277                        if (store.value_regex != NULL) {
1278                                regfree(store.value_regex);
1279                                free(store.value_regex);
1280                        }
1281                        ret = 3;
1282                        goto out_free;
1283                }
1284
1285                free(store.key);
1286                if (store.value_regex != NULL) {
1287                        regfree(store.value_regex);
1288                        free(store.value_regex);
1289                }
1290
1291                /* if nothing to unset, or too many matches, error out */
1292                if ((store.seen == 0 && value == NULL) ||
1293                                (store.seen > 1 && multi_replace == 0)) {
1294                        ret = 5;
1295                        goto out_free;
1296                }
1297
1298                fstat(in_fd, &st);
1299                contents_sz = xsize_t(st.st_size);
1300                contents = xmmap(NULL, contents_sz, PROT_READ,
1301                        MAP_PRIVATE, in_fd, 0);
1302                close(in_fd);
1303
1304                if (store.seen == 0)
1305                        store.seen = 1;
1306
1307                for (i = 0, copy_begin = 0; i < store.seen; i++) {
1308                        if (store.offset[i] == 0) {
1309                                store.offset[i] = copy_end = contents_sz;
1310                        } else if (store.state != KEY_SEEN) {
1311                                copy_end = store.offset[i];
1312                        } else
1313                                copy_end = find_beginning_of_line(
1314                                        contents, contents_sz,
1315                                        store.offset[i]-2, &new_line);
1316
1317                        if (copy_end > 0 && contents[copy_end-1] != '\n')
1318                                new_line = 1;
1319
1320                        /* write the first part of the config */
1321                        if (copy_end > copy_begin) {
1322                                if (write_in_full(fd, contents + copy_begin,
1323                                                  copy_end - copy_begin) <
1324                                    copy_end - copy_begin)
1325                                        goto write_err_out;
1326                                if (new_line &&
1327                                    write_str_in_full(fd, "\n") != 1)
1328                                        goto write_err_out;
1329                        }
1330                        copy_begin = store.offset[i];
1331                }
1332
1333                /* write the pair (value == NULL means unset) */
1334                if (value != NULL) {
1335                        if (store.state == START) {
1336                                if (!store_write_section(fd, key))
1337                                        goto write_err_out;
1338                        }
1339                        if (!store_write_pair(fd, key, value))
1340                                goto write_err_out;
1341                }
1342
1343                /* write the rest of the config */
1344                if (copy_begin < contents_sz)
1345                        if (write_in_full(fd, contents + copy_begin,
1346                                          contents_sz - copy_begin) <
1347                            contents_sz - copy_begin)
1348                                goto write_err_out;
1349
1350                munmap(contents, contents_sz);
1351        }
1352
1353        if (commit_lock_file(lock) < 0) {
1354                error("could not commit config file %s", config_filename);
1355                ret = 4;
1356                goto out_free;
1357        }
1358
1359        /*
1360         * lock is committed, so don't try to roll it back below.
1361         * NOTE: Since lockfile.c keeps a linked list of all created
1362         * lock_file structures, it isn't safe to free(lock).  It's
1363         * better to just leave it hanging around.
1364         */
1365        lock = NULL;
1366        ret = 0;
1367
1368out_free:
1369        if (lock)
1370                rollback_lock_file(lock);
1371        free(config_filename);
1372        return ret;
1373
1374write_err_out:
1375        ret = write_error(lock->filename);
1376        goto out_free;
1377
1378}
1379
1380static int section_name_match (const char *buf, const char *name)
1381{
1382        int i = 0, j = 0, dot = 0;
1383        if (buf[i] != '[')
1384                return 0;
1385        for (i = 1; buf[i] && buf[i] != ']'; i++) {
1386                if (!dot && isspace(buf[i])) {
1387                        dot = 1;
1388                        if (name[j++] != '.')
1389                                break;
1390                        for (i++; isspace(buf[i]); i++)
1391                                ; /* do nothing */
1392                        if (buf[i] != '"')
1393                                break;
1394                        continue;
1395                }
1396                if (buf[i] == '\\' && dot)
1397                        i++;
1398                else if (buf[i] == '"' && dot) {
1399                        for (i++; isspace(buf[i]); i++)
1400                                ; /* do_nothing */
1401                        break;
1402                }
1403                if (buf[i] != name[j++])
1404                        break;
1405        }
1406        if (buf[i] == ']' && name[j] == 0) {
1407                /*
1408                 * We match, now just find the right length offset by
1409                 * gobbling up any whitespace after it, as well
1410                 */
1411                i++;
1412                for (; buf[i] && isspace(buf[i]); i++)
1413                        ; /* do nothing */
1414                return i;
1415        }
1416        return 0;
1417}
1418
1419/* if new_name == NULL, the section is removed instead */
1420int git_config_rename_section(const char *old_name, const char *new_name)
1421{
1422        int ret = 0, remove = 0;
1423        char *config_filename;
1424        struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1425        int out_fd;
1426        char buf[1024];
1427
1428        if (config_exclusive_filename)
1429                config_filename = xstrdup(config_exclusive_filename);
1430        else
1431                config_filename = git_pathdup("config");
1432        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1433        if (out_fd < 0) {
1434                ret = error("could not lock config file %s", config_filename);
1435                goto out;
1436        }
1437
1438        if (!(config_file = fopen(config_filename, "rb"))) {
1439                /* no config file means nothing to rename, no error */
1440                goto unlock_and_out;
1441        }
1442
1443        while (fgets(buf, sizeof(buf), config_file)) {
1444                int i;
1445                int length;
1446                char *output = buf;
1447                for (i = 0; buf[i] && isspace(buf[i]); i++)
1448                        ; /* do nothing */
1449                if (buf[i] == '[') {
1450                        /* it's a section */
1451                        int offset = section_name_match(&buf[i], old_name);
1452                        if (offset > 0) {
1453                                ret++;
1454                                if (new_name == NULL) {
1455                                        remove = 1;
1456                                        continue;
1457                                }
1458                                store.baselen = strlen(new_name);
1459                                if (!store_write_section(out_fd, new_name)) {
1460                                        ret = write_error(lock->filename);
1461                                        goto out;
1462                                }
1463                                /*
1464                                 * We wrote out the new section, with
1465                                 * a newline, now skip the old
1466                                 * section's length
1467                                 */
1468                                output += offset + i;
1469                                if (strlen(output) > 0) {
1470                                        /*
1471                                         * More content means there's
1472                                         * a declaration to put on the
1473                                         * next line; indent with a
1474                                         * tab
1475                                         */
1476                                        output -= 1;
1477                                        output[0] = '\t';
1478                                }
1479                        }
1480                        remove = 0;
1481                }
1482                if (remove)
1483                        continue;
1484                length = strlen(output);
1485                if (write_in_full(out_fd, output, length) != length) {
1486                        ret = write_error(lock->filename);
1487                        goto out;
1488                }
1489        }
1490        fclose(config_file);
1491 unlock_and_out:
1492        if (commit_lock_file(lock) < 0)
1493                ret = error("could not commit config file %s", config_filename);
1494 out:
1495        free(config_filename);
1496        return ret;
1497}
1498
1499/*
1500 * Call this to report error for your variable that should not
1501 * get a boolean value (i.e. "[my] var" means "true").
1502 */
1503int config_error_nonbool(const char *var)
1504{
1505        return error("Missing value for '%s'", var);
1506}