Andrew's git / gitweb.git / config.c
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config.con commit config: always parse GIT_CONFIG_PARAMETERS during git_config (06eb708)
   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
  23static void lowercase(char *p)
  24{
  25        for (; *p; p++)
  26                *p = tolower(*p);
  27}
  28
  29void git_config_push_parameter(const char *text)
  30{
  31        struct strbuf env = STRBUF_INIT;
  32        const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
  33        if (old) {
  34                strbuf_addstr(&env, old);
  35                strbuf_addch(&env, ' ');
  36        }
  37        sq_quote_buf(&env, text);
  38        setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
  39        strbuf_release(&env);
  40}
  41
  42static int git_config_parse_parameter(const char *text,
  43                                      config_fn_t fn, void *data)
  44{
  45        struct strbuf tmp = STRBUF_INIT;
  46        struct strbuf **pair;
  47        strbuf_addstr(&tmp, text);
  48        pair = strbuf_split(&tmp, '=');
  49        if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=')
  50                strbuf_setlen(pair[0], pair[0]->len - 1);
  51        strbuf_trim(pair[0]);
  52        if (!pair[0]->len) {
  53                strbuf_list_free(pair);
  54                return error("bogus config parameter: %s", text);
  55        }
  56        lowercase(pair[0]->buf);
  57        if (fn(pair[0]->buf, pair[1] ? pair[1]->buf : NULL, data) < 0) {
  58                strbuf_list_free(pair);
  59                return -1;
  60        }
  61        strbuf_list_free(pair);
  62        return 0;
  63}
  64
  65int git_config_from_parameters(config_fn_t fn, void *data)
  66{
  67        const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
  68        char *envw;
  69        const char **argv = NULL;
  70        int nr = 0, alloc = 0;
  71        int i;
  72
  73        if (!env)
  74                return 0;
  75        /* sq_dequote will write over it */
  76        envw = xstrdup(env);
  77
  78        if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
  79                free(envw);
  80                return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
  81        }
  82
  83        for (i = 0; i < nr; i++) {
  84                if (git_config_parse_parameter(argv[i], fn, data) < 0) {
  85                        free(argv);
  86                        free(envw);
  87                        return -1;
  88                }
  89        }
  90
  91        free(argv);
  92        free(envw);
  93        return nr > 0;
  94}
  95
  96static int get_next_char(void)
  97{
  98        int c;
  99        FILE *f;
 100
 101        c = '\n';
 102        if ((f = config_file) != NULL) {
 103                c = fgetc(f);
 104                if (c == '\r') {
 105                        /* DOS like systems */
 106                        c = fgetc(f);
 107                        if (c != '\n') {
 108                                ungetc(c, f);
 109                                c = '\r';
 110                        }
 111                }
 112                if (c == '\n')
 113                        config_linenr++;
 114                if (c == EOF) {
 115                        config_file_eof = 1;
 116                        c = '\n';
 117                }
 118        }
 119        return c;
 120}
 121
 122static char *parse_value(void)
 123{
 124        static char value[1024];
 125        int quote = 0, comment = 0, len = 0, space = 0;
 126
 127        for (;;) {
 128                int c = get_next_char();
 129                if (len >= sizeof(value) - 1)
 130                        return NULL;
 131                if (c == '\n') {
 132                        if (quote)
 133                                return NULL;
 134                        value[len] = 0;
 135                        return value;
 136                }
 137                if (comment)
 138                        continue;
 139                if (isspace(c) && !quote) {
 140                        if (len)
 141                                space++;
 142                        continue;
 143                }
 144                if (!quote) {
 145                        if (c == ';' || c == '#') {
 146                                comment = 1;
 147                                continue;
 148                        }
 149                }
 150                for (; space; space--)
 151                        value[len++] = ' ';
 152                if (c == '\\') {
 153                        c = get_next_char();
 154                        switch (c) {
 155                        case '\n':
 156                                continue;
 157                        case 't':
 158                                c = '\t';
 159                                break;
 160                        case 'b':
 161                                c = '\b';
 162                                break;
 163                        case 'n':
 164                                c = '\n';
 165                                break;
 166                        /* Some characters escape as themselves */
 167                        case '\\': case '"':
 168                                break;
 169                        /* Reject unknown escape sequences */
 170                        default:
 171                                return NULL;
 172                        }
 173                        value[len++] = c;
 174                        continue;
 175                }
 176                if (c == '"') {
 177                        quote = 1-quote;
 178                        continue;
 179                }
 180                value[len++] = c;
 181        }
 182}
 183
 184static inline int iskeychar(int c)
 185{
 186        return isalnum(c) || c == '-';
 187}
 188
 189static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)
 190{
 191        int c;
 192        char *value;
 193
 194        /* Get the full name */
 195        for (;;) {
 196                c = get_next_char();
 197                if (config_file_eof)
 198                        break;
 199                if (!iskeychar(c))
 200                        break;
 201                name[len++] = tolower(c);
 202                if (len >= MAXNAME)
 203                        return -1;
 204        }
 205        name[len] = 0;
 206        while (c == ' ' || c == '\t')
 207                c = get_next_char();
 208
 209        value = NULL;
 210        if (c != '\n') {
 211                if (c != '=')
 212                        return -1;
 213                value = parse_value();
 214                if (!value)
 215                        return -1;
 216        }
 217        return fn(name, value, data);
 218}
 219
 220static int get_extended_base_var(char *name, int baselen, int c)
 221{
 222        do {
 223                if (c == '\n')
 224                        return -1;
 225                c = get_next_char();
 226        } while (isspace(c));
 227
 228        /* We require the format to be '[base "extension"]' */
 229        if (c != '"')
 230                return -1;
 231        name[baselen++] = '.';
 232
 233        for (;;) {
 234                int c = get_next_char();
 235                if (c == '\n')
 236                        return -1;
 237                if (c == '"')
 238                        break;
 239                if (c == '\\') {
 240                        c = get_next_char();
 241                        if (c == '\n')
 242                                return -1;
 243                }
 244                name[baselen++] = c;
 245                if (baselen > MAXNAME / 2)
 246                        return -1;
 247        }
 248
 249        /* Final ']' */
 250        if (get_next_char() != ']')
 251                return -1;
 252        return baselen;
 253}
 254
 255static int get_base_var(char *name)
 256{
 257        int baselen = 0;
 258
 259        for (;;) {
 260                int c = get_next_char();
 261                if (config_file_eof)
 262                        return -1;
 263                if (c == ']')
 264                        return baselen;
 265                if (isspace(c))
 266                        return get_extended_base_var(name, baselen, c);
 267                if (!iskeychar(c) && c != '.')
 268                        return -1;
 269                if (baselen > MAXNAME / 2)
 270                        return -1;
 271                name[baselen++] = tolower(c);
 272        }
 273}
 274
 275static int git_parse_file(config_fn_t fn, void *data)
 276{
 277        int comment = 0;
 278        int baselen = 0;
 279        static char var[MAXNAME];
 280
 281        /* U+FEFF Byte Order Mark in UTF8 */
 282        static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
 283        const unsigned char *bomptr = utf8_bom;
 284
 285        for (;;) {
 286                int c = get_next_char();
 287                if (bomptr && *bomptr) {
 288                        /* We are at the file beginning; skip UTF8-encoded BOM
 289                         * if present. Sane editors won't put this in on their
 290                         * own, but e.g. Windows Notepad will do it happily. */
 291                        if ((unsigned char) c == *bomptr) {
 292                                bomptr++;
 293                                continue;
 294                        } else {
 295                                /* Do not tolerate partial BOM. */
 296                                if (bomptr != utf8_bom)
 297                                        break;
 298                                /* No BOM at file beginning. Cool. */
 299                                bomptr = NULL;
 300                        }
 301                }
 302                if (c == '\n') {
 303                        if (config_file_eof)
 304                                return 0;
 305                        comment = 0;
 306                        continue;
 307                }
 308                if (comment || isspace(c))
 309                        continue;
 310                if (c == '#' || c == ';') {
 311                        comment = 1;
 312                        continue;
 313                }
 314                if (c == '[') {
 315                        baselen = get_base_var(var);
 316                        if (baselen <= 0)
 317                                break;
 318                        var[baselen++] = '.';
 319                        var[baselen] = 0;
 320                        continue;
 321                }
 322                if (!isalpha(c))
 323                        break;
 324                var[baselen] = tolower(c);
 325                if (get_value(fn, data, var, baselen+1) < 0)
 326                        break;
 327        }
 328        die("bad config file line %d in %s", config_linenr, config_file_name);
 329}
 330
 331static int parse_unit_factor(const char *end, unsigned long *val)
 332{
 333        if (!*end)
 334                return 1;
 335        else if (!strcasecmp(end, "k")) {
 336                *val *= 1024;
 337                return 1;
 338        }
 339        else if (!strcasecmp(end, "m")) {
 340                *val *= 1024 * 1024;
 341                return 1;
 342        }
 343        else if (!strcasecmp(end, "g")) {
 344                *val *= 1024 * 1024 * 1024;
 345                return 1;
 346        }
 347        return 0;
 348}
 349
 350static int git_parse_long(const char *value, long *ret)
 351{
 352        if (value && *value) {
 353                char *end;
 354                long val = strtol(value, &end, 0);
 355                unsigned long factor = 1;
 356                if (!parse_unit_factor(end, &factor))
 357                        return 0;
 358                *ret = val * factor;
 359                return 1;
 360        }
 361        return 0;
 362}
 363
 364int git_parse_ulong(const char *value, unsigned long *ret)
 365{
 366        if (value && *value) {
 367                char *end;
 368                unsigned long val = strtoul(value, &end, 0);
 369                if (!parse_unit_factor(end, &val))
 370                        return 0;
 371                *ret = val;
 372                return 1;
 373        }
 374        return 0;
 375}
 376
 377static void die_bad_config(const char *name)
 378{
 379        if (config_file_name)
 380                die("bad config value for '%s' in %s", name, config_file_name);
 381        die("bad config value for '%s'", name);
 382}
 383
 384int git_config_int(const char *name, const char *value)
 385{
 386        long ret = 0;
 387        if (!git_parse_long(value, &ret))
 388                die_bad_config(name);
 389        return ret;
 390}
 391
 392unsigned long git_config_ulong(const char *name, const char *value)
 393{
 394        unsigned long ret;
 395        if (!git_parse_ulong(value, &ret))
 396                die_bad_config(name);
 397        return ret;
 398}
 399
 400int git_config_maybe_bool(const char *name, const char *value)
 401{
 402        if (!value)
 403                return 1;
 404        if (!*value)
 405                return 0;
 406        if (!strcasecmp(value, "true")
 407            || !strcasecmp(value, "yes")
 408            || !strcasecmp(value, "on"))
 409                return 1;
 410        if (!strcasecmp(value, "false")
 411            || !strcasecmp(value, "no")
 412            || !strcasecmp(value, "off"))
 413                return 0;
 414        return -1;
 415}
 416
 417int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 418{
 419        int v = git_config_maybe_bool(name, value);
 420        if (0 <= v) {
 421                *is_bool = 1;
 422                return v;
 423        }
 424        *is_bool = 0;
 425        return git_config_int(name, value);
 426}
 427
 428int git_config_bool(const char *name, const char *value)
 429{
 430        int discard;
 431        return !!git_config_bool_or_int(name, value, &discard);
 432}
 433
 434int git_config_string(const char **dest, const char *var, const char *value)
 435{
 436        if (!value)
 437                return config_error_nonbool(var);
 438        *dest = xstrdup(value);
 439        return 0;
 440}
 441
 442int git_config_pathname(const char **dest, const char *var, const char *value)
 443{
 444        if (!value)
 445                return config_error_nonbool(var);
 446        *dest = expand_user_path(value);
 447        if (!*dest)
 448                die("Failed to expand user dir in: '%s'", value);
 449        return 0;
 450}
 451
 452static int git_default_core_config(const char *var, const char *value)
 453{
 454        /* This needs a better name */
 455        if (!strcmp(var, "core.filemode")) {
 456                trust_executable_bit = git_config_bool(var, value);
 457                return 0;
 458        }
 459        if (!strcmp(var, "core.trustctime")) {
 460                trust_ctime = git_config_bool(var, value);
 461                return 0;
 462        }
 463
 464        if (!strcmp(var, "core.quotepath")) {
 465                quote_path_fully = git_config_bool(var, value);
 466                return 0;
 467        }
 468
 469        if (!strcmp(var, "core.symlinks")) {
 470                has_symlinks = git_config_bool(var, value);
 471                return 0;
 472        }
 473
 474        if (!strcmp(var, "core.ignorecase")) {
 475                ignore_case = git_config_bool(var, value);
 476                return 0;
 477        }
 478
 479        if (!strcmp(var, "core.bare")) {
 480                is_bare_repository_cfg = git_config_bool(var, value);
 481                return 0;
 482        }
 483
 484        if (!strcmp(var, "core.ignorestat")) {
 485                assume_unchanged = git_config_bool(var, value);
 486                return 0;
 487        }
 488
 489        if (!strcmp(var, "core.prefersymlinkrefs")) {
 490                prefer_symlink_refs = git_config_bool(var, value);
 491                return 0;
 492        }
 493
 494        if (!strcmp(var, "core.logallrefupdates")) {
 495                log_all_ref_updates = git_config_bool(var, value);
 496                return 0;
 497        }
 498
 499        if (!strcmp(var, "core.warnambiguousrefs")) {
 500                warn_ambiguous_refs = git_config_bool(var, value);
 501                return 0;
 502        }
 503
 504        if (!strcmp(var, "core.loosecompression")) {
 505                int level = git_config_int(var, value);
 506                if (level == -1)
 507                        level = Z_DEFAULT_COMPRESSION;
 508                else if (level < 0 || level > Z_BEST_COMPRESSION)
 509                        die("bad zlib compression level %d", level);
 510                zlib_compression_level = level;
 511                zlib_compression_seen = 1;
 512                return 0;
 513        }
 514
 515        if (!strcmp(var, "core.compression")) {
 516                int level = git_config_int(var, value);
 517                if (level == -1)
 518                        level = Z_DEFAULT_COMPRESSION;
 519                else if (level < 0 || level > Z_BEST_COMPRESSION)
 520                        die("bad zlib compression level %d", level);
 521                core_compression_level = level;
 522                core_compression_seen = 1;
 523                if (!zlib_compression_seen)
 524                        zlib_compression_level = level;
 525                return 0;
 526        }
 527
 528        if (!strcmp(var, "core.packedgitwindowsize")) {
 529                int pgsz_x2 = getpagesize() * 2;
 530                packed_git_window_size = git_config_int(var, value);
 531
 532                /* This value must be multiple of (pagesize * 2) */
 533                packed_git_window_size /= pgsz_x2;
 534                if (packed_git_window_size < 1)
 535                        packed_git_window_size = 1;
 536                packed_git_window_size *= pgsz_x2;
 537                return 0;
 538        }
 539
 540        if (!strcmp(var, "core.packedgitlimit")) {
 541                packed_git_limit = git_config_int(var, value);
 542                return 0;
 543        }
 544
 545        if (!strcmp(var, "core.deltabasecachelimit")) {
 546                delta_base_cache_limit = git_config_int(var, value);
 547                return 0;
 548        }
 549
 550        if (!strcmp(var, "core.autocrlf")) {
 551                if (value && !strcasecmp(value, "input")) {
 552                        if (eol == EOL_CRLF)
 553                                return error("core.autocrlf=input conflicts with core.eol=crlf");
 554                        auto_crlf = AUTO_CRLF_INPUT;
 555                        return 0;
 556                }
 557                auto_crlf = git_config_bool(var, value);
 558                return 0;
 559        }
 560
 561        if (!strcmp(var, "core.safecrlf")) {
 562                if (value && !strcasecmp(value, "warn")) {
 563                        safe_crlf = SAFE_CRLF_WARN;
 564                        return 0;
 565                }
 566                safe_crlf = git_config_bool(var, value);
 567                return 0;
 568        }
 569
 570        if (!strcmp(var, "core.eol")) {
 571                if (value && !strcasecmp(value, "lf"))
 572                        eol = EOL_LF;
 573                else if (value && !strcasecmp(value, "crlf"))
 574                        eol = EOL_CRLF;
 575                else if (value && !strcasecmp(value, "native"))
 576                        eol = EOL_NATIVE;
 577                else
 578                        eol = EOL_UNSET;
 579                if (eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 580                        return error("core.autocrlf=input conflicts with core.eol=crlf");
 581                return 0;
 582        }
 583
 584        if (!strcmp(var, "core.notesref")) {
 585                notes_ref_name = xstrdup(value);
 586                return 0;
 587        }
 588
 589        if (!strcmp(var, "core.pager"))
 590                return git_config_string(&pager_program, var, value);
 591
 592        if (!strcmp(var, "core.editor"))
 593                return git_config_string(&editor_program, var, value);
 594
 595        if (!strcmp(var, "core.askpass"))
 596                return git_config_string(&askpass_program, var, value);
 597
 598        if (!strcmp(var, "core.excludesfile"))
 599                return git_config_pathname(&excludes_file, var, value);
 600
 601        if (!strcmp(var, "core.whitespace")) {
 602                if (!value)
 603                        return config_error_nonbool(var);
 604                whitespace_rule_cfg = parse_whitespace_rule(value);
 605                return 0;
 606        }
 607
 608        if (!strcmp(var, "core.fsyncobjectfiles")) {
 609                fsync_object_files = git_config_bool(var, value);
 610                return 0;
 611        }
 612
 613        if (!strcmp(var, "core.preloadindex")) {
 614                core_preload_index = git_config_bool(var, value);
 615                return 0;
 616        }
 617
 618        if (!strcmp(var, "core.createobject")) {
 619                if (!strcmp(value, "rename"))
 620                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 621                else if (!strcmp(value, "link"))
 622                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 623                else
 624                        die("Invalid mode for object creation: %s", value);
 625                return 0;
 626        }
 627
 628        if (!strcmp(var, "core.sparsecheckout")) {
 629                core_apply_sparse_checkout = git_config_bool(var, value);
 630                return 0;
 631        }
 632
 633        /* Add other config variables here and to Documentation/config.txt. */
 634        return 0;
 635}
 636
 637static int git_default_user_config(const char *var, const char *value)
 638{
 639        if (!strcmp(var, "user.name")) {
 640                if (!value)
 641                        return config_error_nonbool(var);
 642                strlcpy(git_default_name, value, sizeof(git_default_name));
 643                user_ident_explicitly_given |= IDENT_NAME_GIVEN;
 644                return 0;
 645        }
 646
 647        if (!strcmp(var, "user.email")) {
 648                if (!value)
 649                        return config_error_nonbool(var);
 650                strlcpy(git_default_email, value, sizeof(git_default_email));
 651                user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 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_i18n_config(const char *var, const char *value)
 660{
 661        if (!strcmp(var, "i18n.commitencoding"))
 662                return git_config_string(&git_commit_encoding, var, value);
 663
 664        if (!strcmp(var, "i18n.logoutputencoding"))
 665                return git_config_string(&git_log_output_encoding, var, value);
 666
 667        /* Add other config variables here and to Documentation/config.txt. */
 668        return 0;
 669}
 670
 671static int git_default_branch_config(const char *var, const char *value)
 672{
 673        if (!strcmp(var, "branch.autosetupmerge")) {
 674                if (value && !strcasecmp(value, "always")) {
 675                        git_branch_track = BRANCH_TRACK_ALWAYS;
 676                        return 0;
 677                }
 678                git_branch_track = git_config_bool(var, value);
 679                return 0;
 680        }
 681        if (!strcmp(var, "branch.autosetuprebase")) {
 682                if (!value)
 683                        return config_error_nonbool(var);
 684                else if (!strcmp(value, "never"))
 685                        autorebase = AUTOREBASE_NEVER;
 686                else if (!strcmp(value, "local"))
 687                        autorebase = AUTOREBASE_LOCAL;
 688                else if (!strcmp(value, "remote"))
 689                        autorebase = AUTOREBASE_REMOTE;
 690                else if (!strcmp(value, "always"))
 691                        autorebase = AUTOREBASE_ALWAYS;
 692                else
 693                        return error("Malformed value for %s", var);
 694                return 0;
 695        }
 696
 697        /* Add other config variables here and to Documentation/config.txt. */
 698        return 0;
 699}
 700
 701static int git_default_push_config(const char *var, const char *value)
 702{
 703        if (!strcmp(var, "push.default")) {
 704                if (!value)
 705                        return config_error_nonbool(var);
 706                else if (!strcmp(value, "nothing"))
 707                        push_default = PUSH_DEFAULT_NOTHING;
 708                else if (!strcmp(value, "matching"))
 709                        push_default = PUSH_DEFAULT_MATCHING;
 710                else if (!strcmp(value, "tracking"))
 711                        push_default = PUSH_DEFAULT_TRACKING;
 712                else if (!strcmp(value, "current"))
 713                        push_default = PUSH_DEFAULT_CURRENT;
 714                else {
 715                        error("Malformed value for %s: %s", var, value);
 716                        return error("Must be one of nothing, matching, "
 717                                     "tracking or current.");
 718                }
 719                return 0;
 720        }
 721
 722        /* Add other config variables here and to Documentation/config.txt. */
 723        return 0;
 724}
 725
 726static int git_default_mailmap_config(const char *var, const char *value)
 727{
 728        if (!strcmp(var, "mailmap.file"))
 729                return git_config_string(&git_mailmap_file, var, value);
 730
 731        /* Add other config variables here and to Documentation/config.txt. */
 732        return 0;
 733}
 734
 735int git_default_config(const char *var, const char *value, void *dummy)
 736{
 737        if (!prefixcmp(var, "core."))
 738                return git_default_core_config(var, value);
 739
 740        if (!prefixcmp(var, "user."))
 741                return git_default_user_config(var, value);
 742
 743        if (!prefixcmp(var, "i18n."))
 744                return git_default_i18n_config(var, value);
 745
 746        if (!prefixcmp(var, "branch."))
 747                return git_default_branch_config(var, value);
 748
 749        if (!prefixcmp(var, "push."))
 750                return git_default_push_config(var, value);
 751
 752        if (!prefixcmp(var, "mailmap."))
 753                return git_default_mailmap_config(var, value);
 754
 755        if (!prefixcmp(var, "advice."))
 756                return git_default_advice_config(var, value);
 757
 758        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 759                pager_use_color = git_config_bool(var,value);
 760                return 0;
 761        }
 762
 763        /* Add other config variables here and to Documentation/config.txt. */
 764        return 0;
 765}
 766
 767int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 768{
 769        int ret;
 770        FILE *f = fopen(filename, "r");
 771
 772        ret = -1;
 773        if (f) {
 774                config_file = f;
 775                config_file_name = filename;
 776                config_linenr = 1;
 777                config_file_eof = 0;
 778                ret = git_parse_file(fn, data);
 779                fclose(f);
 780                config_file_name = NULL;
 781        }
 782        return ret;
 783}
 784
 785const char *git_etc_gitconfig(void)
 786{
 787        static const char *system_wide;
 788        if (!system_wide)
 789                system_wide = system_path(ETC_GITCONFIG);
 790        return system_wide;
 791}
 792
 793int git_env_bool(const char *k, int def)
 794{
 795        const char *v = getenv(k);
 796        return v ? git_config_bool(k, v) : def;
 797}
 798
 799int git_config_system(void)
 800{
 801        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 802}
 803
 804int git_config_global(void)
 805{
 806        return !git_env_bool("GIT_CONFIG_NOGLOBAL", 0);
 807}
 808
 809int git_config_early(config_fn_t fn, void *data, const char *repo_config)
 810{
 811        int ret = 0, found = 0;
 812        const char *home = NULL;
 813
 814        /* Setting $GIT_CONFIG makes git read _only_ the given config file. */
 815        if (config_exclusive_filename)
 816                return git_config_from_file(fn, config_exclusive_filename, data);
 817        if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
 818                ret += git_config_from_file(fn, git_etc_gitconfig(),
 819                                            data);
 820                found += 1;
 821        }
 822
 823        home = getenv("HOME");
 824        if (git_config_global() && home) {
 825                char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
 826                if (!access(user_config, R_OK)) {
 827                        ret += git_config_from_file(fn, user_config, data);
 828                        found += 1;
 829                }
 830                free(user_config);
 831        }
 832
 833        if (repo_config && !access(repo_config, R_OK)) {
 834                ret += git_config_from_file(fn, repo_config, data);
 835                found += 1;
 836        }
 837
 838        switch (git_config_from_parameters(fn, data)) {
 839        case -1: /* error */
 840                ret--;
 841                break;
 842        case 0: /* found nothing */
 843                break;
 844        default: /* found at least one item */
 845                found++;
 846                break;
 847        }
 848
 849        if (found == 0)
 850                return -1;
 851        return ret;
 852}
 853
 854int git_config(config_fn_t fn, void *data)
 855{
 856        char *repo_config = NULL;
 857        int ret;
 858
 859        repo_config = git_pathdup("config");
 860        ret = git_config_early(fn, data, repo_config);
 861        if (repo_config)
 862                free(repo_config);
 863        return ret;
 864}
 865
 866/*
 867 * Find all the stuff for git_config_set() below.
 868 */
 869
 870#define MAX_MATCHES 512
 871
 872static struct {
 873        int baselen;
 874        char *key;
 875        int do_not_match;
 876        regex_t *value_regex;
 877        int multi_replace;
 878        size_t offset[MAX_MATCHES];
 879        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
 880        int seen;
 881} store;
 882
 883static int matches(const char *key, const char *value)
 884{
 885        return !strcmp(key, store.key) &&
 886                (store.value_regex == NULL ||
 887                 (store.do_not_match ^
 888                  !regexec(store.value_regex, value, 0, NULL, 0)));
 889}
 890
 891static int store_aux(const char *key, const char *value, void *cb)
 892{
 893        const char *ep;
 894        size_t section_len;
 895
 896        switch (store.state) {
 897        case KEY_SEEN:
 898                if (matches(key, value)) {
 899                        if (store.seen == 1 && store.multi_replace == 0) {
 900                                warning("%s has multiple values", key);
 901                        } else if (store.seen >= MAX_MATCHES) {
 902                                error("too many matches for %s", key);
 903                                return 1;
 904                        }
 905
 906                        store.offset[store.seen] = ftell(config_file);
 907                        store.seen++;
 908                }
 909                break;
 910        case SECTION_SEEN:
 911                /*
 912                 * What we are looking for is in store.key (both
 913                 * section and var), and its section part is baselen
 914                 * long.  We found key (again, both section and var).
 915                 * We would want to know if this key is in the same
 916                 * section as what we are looking for.  We already
 917                 * know we are in the same section as what should
 918                 * hold store.key.
 919                 */
 920                ep = strrchr(key, '.');
 921                section_len = ep - key;
 922
 923                if ((section_len != store.baselen) ||
 924                    memcmp(key, store.key, section_len+1)) {
 925                        store.state = SECTION_END_SEEN;
 926                        break;
 927                }
 928
 929                /*
 930                 * Do not increment matches: this is no match, but we
 931                 * just made sure we are in the desired section.
 932                 */
 933                store.offset[store.seen] = ftell(config_file);
 934                /* fallthru */
 935        case SECTION_END_SEEN:
 936        case START:
 937                if (matches(key, value)) {
 938                        store.offset[store.seen] = ftell(config_file);
 939                        store.state = KEY_SEEN;
 940                        store.seen++;
 941                } else {
 942                        if (strrchr(key, '.') - key == store.baselen &&
 943                              !strncmp(key, store.key, store.baselen)) {
 944                                        store.state = SECTION_SEEN;
 945                                        store.offset[store.seen] = ftell(config_file);
 946                        }
 947                }
 948        }
 949        return 0;
 950}
 951
 952static int write_error(const char *filename)
 953{
 954        error("failed to write new configuration file %s", filename);
 955
 956        /* Same error code as "failed to rename". */
 957        return 4;
 958}
 959
 960static int store_write_section(int fd, const char *key)
 961{
 962        const char *dot;
 963        int i, success;
 964        struct strbuf sb = STRBUF_INIT;
 965
 966        dot = memchr(key, '.', store.baselen);
 967        if (dot) {
 968                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
 969                for (i = dot - key + 1; i < store.baselen; i++) {
 970                        if (key[i] == '"' || key[i] == '\\')
 971                                strbuf_addch(&sb, '\\');
 972                        strbuf_addch(&sb, key[i]);
 973                }
 974                strbuf_addstr(&sb, "\"]\n");
 975        } else {
 976                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
 977        }
 978
 979        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
 980        strbuf_release(&sb);
 981
 982        return success;
 983}
 984
 985static int store_write_pair(int fd, const char *key, const char *value)
 986{
 987        int i, success;
 988        int length = strlen(key + store.baselen + 1);
 989        const char *quote = "";
 990        struct strbuf sb = STRBUF_INIT;
 991
 992        /*
 993         * Check to see if the value needs to be surrounded with a dq pair.
 994         * Note that problematic characters are always backslash-quoted; this
 995         * check is about not losing leading or trailing SP and strings that
 996         * follow beginning-of-comment characters (i.e. ';' and '#') by the
 997         * configuration parser.
 998         */
 999        if (value[0] == ' ')
1000                quote = "\"";
1001        for (i = 0; value[i]; i++)
1002                if (value[i] == ';' || value[i] == '#')
1003                        quote = "\"";
1004        if (i && value[i - 1] == ' ')
1005                quote = "\"";
1006
1007        strbuf_addf(&sb, "\t%.*s = %s",
1008                    length, key + store.baselen + 1, quote);
1009
1010        for (i = 0; value[i]; i++)
1011                switch (value[i]) {
1012                case '\n':
1013                        strbuf_addstr(&sb, "\\n");
1014                        break;
1015                case '\t':
1016                        strbuf_addstr(&sb, "\\t");
1017                        break;
1018                case '"':
1019                case '\\':
1020                        strbuf_addch(&sb, '\\');
1021                default:
1022                        strbuf_addch(&sb, value[i]);
1023                        break;
1024                }
1025        strbuf_addf(&sb, "%s\n", quote);
1026
1027        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1028        strbuf_release(&sb);
1029
1030        return success;
1031}
1032
1033static ssize_t find_beginning_of_line(const char *contents, size_t size,
1034        size_t offset_, int *found_bracket)
1035{
1036        size_t equal_offset = size, bracket_offset = size;
1037        ssize_t offset;
1038
1039contline:
1040        for (offset = offset_-2; offset > 0
1041                        && contents[offset] != '\n'; offset--)
1042                switch (contents[offset]) {
1043                        case '=': equal_offset = offset; break;
1044                        case ']': bracket_offset = offset; break;
1045                }
1046        if (offset > 0 && contents[offset-1] == '\\') {
1047                offset_ = offset;
1048                goto contline;
1049        }
1050        if (bracket_offset < equal_offset) {
1051                *found_bracket = 1;
1052                offset = bracket_offset+1;
1053        } else
1054                offset++;
1055
1056        return offset;
1057}
1058
1059int git_config_set(const char *key, const char *value)
1060{
1061        return git_config_set_multivar(key, value, NULL, 0);
1062}
1063
1064/*
1065 * If value==NULL, unset in (remove from) config,
1066 * if value_regex!=NULL, disregard key/value pairs where value does not match.
1067 * if multi_replace==0, nothing, or only one matching key/value is replaced,
1068 *     else all matching key/values (regardless how many) are removed,
1069 *     before the new pair is written.
1070 *
1071 * Returns 0 on success.
1072 *
1073 * This function does this:
1074 *
1075 * - it locks the config file by creating ".git/config.lock"
1076 *
1077 * - it then parses the config using store_aux() as validator to find
1078 *   the position on the key/value pair to replace. If it is to be unset,
1079 *   it must be found exactly once.
1080 *
1081 * - the config file is mmap()ed and the part before the match (if any) is
1082 *   written to the lock file, then the changed part and the rest.
1083 *
1084 * - the config file is removed and the lock file rename()d to it.
1085 *
1086 */
1087int git_config_set_multivar(const char *key, const char *value,
1088        const char *value_regex, int multi_replace)
1089{
1090        int i, dot;
1091        int fd = -1, in_fd;
1092        int ret;
1093        char *config_filename;
1094        struct lock_file *lock = NULL;
1095        const char *last_dot = strrchr(key, '.');
1096
1097        if (config_exclusive_filename)
1098                config_filename = xstrdup(config_exclusive_filename);
1099        else
1100                config_filename = git_pathdup("config");
1101
1102        /*
1103         * Since "key" actually contains the section name and the real
1104         * key name separated by a dot, we have to know where the dot is.
1105         */
1106
1107        if (last_dot == NULL) {
1108                error("key does not contain a section: %s", key);
1109                ret = 2;
1110                goto out_free;
1111        }
1112        store.baselen = last_dot - key;
1113
1114        store.multi_replace = multi_replace;
1115
1116        /*
1117         * Validate the key and while at it, lower case it for matching.
1118         */
1119        store.key = xmalloc(strlen(key) + 1);
1120        dot = 0;
1121        for (i = 0; key[i]; i++) {
1122                unsigned char c = key[i];
1123                if (c == '.')
1124                        dot = 1;
1125                /* Leave the extended basename untouched.. */
1126                if (!dot || i > store.baselen) {
1127                        if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
1128                                error("invalid key: %s", key);
1129                                free(store.key);
1130                                ret = 1;
1131                                goto out_free;
1132                        }
1133                        c = tolower(c);
1134                } else if (c == '\n') {
1135                        error("invalid key (newline): %s", key);
1136                        free(store.key);
1137                        ret = 1;
1138                        goto out_free;
1139                }
1140                store.key[i] = c;
1141        }
1142        store.key[i] = 0;
1143
1144        /*
1145         * The lock serves a purpose in addition to locking: the new
1146         * contents of .git/config will be written into it.
1147         */
1148        lock = xcalloc(sizeof(struct lock_file), 1);
1149        fd = hold_lock_file_for_update(lock, config_filename, 0);
1150        if (fd < 0) {
1151                error("could not lock config file %s: %s", config_filename, strerror(errno));
1152                free(store.key);
1153                ret = -1;
1154                goto out_free;
1155        }
1156
1157        /*
1158         * If .git/config does not exist yet, write a minimal version.
1159         */
1160        in_fd = open(config_filename, O_RDONLY);
1161        if ( in_fd < 0 ) {
1162                free(store.key);
1163
1164                if ( ENOENT != errno ) {
1165                        error("opening %s: %s", config_filename,
1166                              strerror(errno));
1167                        ret = 3; /* same as "invalid config file" */
1168                        goto out_free;
1169                }
1170                /* if nothing to unset, error out */
1171                if (value == NULL) {
1172                        ret = 5;
1173                        goto out_free;
1174                }
1175
1176                store.key = (char *)key;
1177                if (!store_write_section(fd, key) ||
1178                    !store_write_pair(fd, key, value))
1179                        goto write_err_out;
1180        } else {
1181                struct stat st;
1182                char *contents;
1183                size_t contents_sz, copy_begin, copy_end;
1184                int i, new_line = 0;
1185
1186                if (value_regex == NULL)
1187                        store.value_regex = NULL;
1188                else {
1189                        if (value_regex[0] == '!') {
1190                                store.do_not_match = 1;
1191                                value_regex++;
1192                        } else
1193                                store.do_not_match = 0;
1194
1195                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1196                        if (regcomp(store.value_regex, value_regex,
1197                                        REG_EXTENDED)) {
1198                                error("invalid pattern: %s", value_regex);
1199                                free(store.value_regex);
1200                                ret = 6;
1201                                goto out_free;
1202                        }
1203                }
1204
1205                store.offset[0] = 0;
1206                store.state = START;
1207                store.seen = 0;
1208
1209                /*
1210                 * After this, store.offset will contain the *end* offset
1211                 * of the last match, or remain at 0 if no match was found.
1212                 * As a side effect, we make sure to transform only a valid
1213                 * existing config file.
1214                 */
1215                if (git_config_from_file(store_aux, config_filename, NULL)) {
1216                        error("invalid config file %s", config_filename);
1217                        free(store.key);
1218                        if (store.value_regex != NULL) {
1219                                regfree(store.value_regex);
1220                                free(store.value_regex);
1221                        }
1222                        ret = 3;
1223                        goto out_free;
1224                }
1225
1226                free(store.key);
1227                if (store.value_regex != NULL) {
1228                        regfree(store.value_regex);
1229                        free(store.value_regex);
1230                }
1231
1232                /* if nothing to unset, or too many matches, error out */
1233                if ((store.seen == 0 && value == NULL) ||
1234                                (store.seen > 1 && multi_replace == 0)) {
1235                        ret = 5;
1236                        goto out_free;
1237                }
1238
1239                fstat(in_fd, &st);
1240                contents_sz = xsize_t(st.st_size);
1241                contents = xmmap(NULL, contents_sz, PROT_READ,
1242                        MAP_PRIVATE, in_fd, 0);
1243                close(in_fd);
1244
1245                if (store.seen == 0)
1246                        store.seen = 1;
1247
1248                for (i = 0, copy_begin = 0; i < store.seen; i++) {
1249                        if (store.offset[i] == 0) {
1250                                store.offset[i] = copy_end = contents_sz;
1251                        } else if (store.state != KEY_SEEN) {
1252                                copy_end = store.offset[i];
1253                        } else
1254                                copy_end = find_beginning_of_line(
1255                                        contents, contents_sz,
1256                                        store.offset[i]-2, &new_line);
1257
1258                        if (copy_end > 0 && contents[copy_end-1] != '\n')
1259                                new_line = 1;
1260
1261                        /* write the first part of the config */
1262                        if (copy_end > copy_begin) {
1263                                if (write_in_full(fd, contents + copy_begin,
1264                                                  copy_end - copy_begin) <
1265                                    copy_end - copy_begin)
1266                                        goto write_err_out;
1267                                if (new_line &&
1268                                    write_str_in_full(fd, "\n") != 1)
1269                                        goto write_err_out;
1270                        }
1271                        copy_begin = store.offset[i];
1272                }
1273
1274                /* write the pair (value == NULL means unset) */
1275                if (value != NULL) {
1276                        if (store.state == START) {
1277                                if (!store_write_section(fd, key))
1278                                        goto write_err_out;
1279                        }
1280                        if (!store_write_pair(fd, key, value))
1281                                goto write_err_out;
1282                }
1283
1284                /* write the rest of the config */
1285                if (copy_begin < contents_sz)
1286                        if (write_in_full(fd, contents + copy_begin,
1287                                          contents_sz - copy_begin) <
1288                            contents_sz - copy_begin)
1289                                goto write_err_out;
1290
1291                munmap(contents, contents_sz);
1292        }
1293
1294        if (commit_lock_file(lock) < 0) {
1295                error("could not commit config file %s", config_filename);
1296                ret = 4;
1297                goto out_free;
1298        }
1299
1300        /*
1301         * lock is committed, so don't try to roll it back below.
1302         * NOTE: Since lockfile.c keeps a linked list of all created
1303         * lock_file structures, it isn't safe to free(lock).  It's
1304         * better to just leave it hanging around.
1305         */
1306        lock = NULL;
1307        ret = 0;
1308
1309out_free:
1310        if (lock)
1311                rollback_lock_file(lock);
1312        free(config_filename);
1313        return ret;
1314
1315write_err_out:
1316        ret = write_error(lock->filename);
1317        goto out_free;
1318
1319}
1320
1321static int section_name_match (const char *buf, const char *name)
1322{
1323        int i = 0, j = 0, dot = 0;
1324        if (buf[i] != '[')
1325                return 0;
1326        for (i = 1; buf[i] && buf[i] != ']'; i++) {
1327                if (!dot && isspace(buf[i])) {
1328                        dot = 1;
1329                        if (name[j++] != '.')
1330                                break;
1331                        for (i++; isspace(buf[i]); i++)
1332                                ; /* do nothing */
1333                        if (buf[i] != '"')
1334                                break;
1335                        continue;
1336                }
1337                if (buf[i] == '\\' && dot)
1338                        i++;
1339                else if (buf[i] == '"' && dot) {
1340                        for (i++; isspace(buf[i]); i++)
1341                                ; /* do_nothing */
1342                        break;
1343                }
1344                if (buf[i] != name[j++])
1345                        break;
1346        }
1347        if (buf[i] == ']' && name[j] == 0) {
1348                /*
1349                 * We match, now just find the right length offset by
1350                 * gobbling up any whitespace after it, as well
1351                 */
1352                i++;
1353                for (; buf[i] && isspace(buf[i]); i++)
1354                        ; /* do nothing */
1355                return i;
1356        }
1357        return 0;
1358}
1359
1360/* if new_name == NULL, the section is removed instead */
1361int git_config_rename_section(const char *old_name, const char *new_name)
1362{
1363        int ret = 0, remove = 0;
1364        char *config_filename;
1365        struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1366        int out_fd;
1367        char buf[1024];
1368
1369        if (config_exclusive_filename)
1370                config_filename = xstrdup(config_exclusive_filename);
1371        else
1372                config_filename = git_pathdup("config");
1373        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1374        if (out_fd < 0) {
1375                ret = error("could not lock config file %s", config_filename);
1376                goto out;
1377        }
1378
1379        if (!(config_file = fopen(config_filename, "rb"))) {
1380                /* no config file means nothing to rename, no error */
1381                goto unlock_and_out;
1382        }
1383
1384        while (fgets(buf, sizeof(buf), config_file)) {
1385                int i;
1386                int length;
1387                char *output = buf;
1388                for (i = 0; buf[i] && isspace(buf[i]); i++)
1389                        ; /* do nothing */
1390                if (buf[i] == '[') {
1391                        /* it's a section */
1392                        int offset = section_name_match(&buf[i], old_name);
1393                        if (offset > 0) {
1394                                ret++;
1395                                if (new_name == NULL) {
1396                                        remove = 1;
1397                                        continue;
1398                                }
1399                                store.baselen = strlen(new_name);
1400                                if (!store_write_section(out_fd, new_name)) {
1401                                        ret = write_error(lock->filename);
1402                                        goto out;
1403                                }
1404                                /*
1405                                 * We wrote out the new section, with
1406                                 * a newline, now skip the old
1407                                 * section's length
1408                                 */
1409                                output += offset + i;
1410                                if (strlen(output) > 0) {
1411                                        /*
1412                                         * More content means there's
1413                                         * a declaration to put on the
1414                                         * next line; indent with a
1415                                         * tab
1416                                         */
1417                                        output -= 1;
1418                                        output[0] = '\t';
1419                                }
1420                        }
1421                        remove = 0;
1422                }
1423                if (remove)
1424                        continue;
1425                length = strlen(output);
1426                if (write_in_full(out_fd, output, length) != length) {
1427                        ret = write_error(lock->filename);
1428                        goto out;
1429                }
1430        }
1431        fclose(config_file);
1432 unlock_and_out:
1433        if (commit_lock_file(lock) < 0)
1434                ret = error("could not commit config file %s", config_filename);
1435 out:
1436        free(config_filename);
1437        return ret;
1438}
1439
1440/*
1441 * Call this to report error for your variable that should not
1442 * get a boolean value (i.e. "[my] var" means "true").
1443 */
1444int config_error_nonbool(const char *var)
1445{
1446        return error("Missing value for '%s'", var);
1447}