Andrew's git - gitweb.git/blob

c3597e0432f5ffd7c5e73f2fd71cedb7793b9b5e
   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
  11#define MAXNAME (256)
  12
  13static FILE *config_file;
  14static const char *config_file_name;
  15static int config_linenr;
  16static int config_file_eof;
  17static int zlib_compression_seen;
  18
  19static int get_next_char(void)
  20{
  21        int c;
  22        FILE *f;
  23
  24        c = '\n';
  25        if ((f = config_file) != NULL) {
  26                c = fgetc(f);
  27                if (c == '\r') {
  28                        /* DOS like systems */
  29                        c = fgetc(f);
  30                        if (c != '\n') {
  31                                ungetc(c, f);
  32                                c = '\r';
  33                        }
  34                }
  35                if (c == '\n')
  36                        config_linenr++;
  37                if (c == EOF) {
  38                        config_file_eof = 1;
  39                        c = '\n';
  40                }
  41        }
  42        return c;
  43}
  44
  45static char *parse_value(void)
  46{
  47        static char value[1024];
  48        int quote = 0, comment = 0, len = 0, space = 0;
  49
  50        for (;;) {
  51                int c = get_next_char();
  52                if (len >= sizeof(value))
  53                        return NULL;
  54                if (c == '\n') {
  55                        if (quote)
  56                                return NULL;
  57                        value[len] = 0;
  58                        return value;
  59                }
  60                if (comment)
  61                        continue;
  62                if (isspace(c) && !quote) {
  63                        space = 1;
  64                        continue;
  65                }
  66                if (!quote) {
  67                        if (c == ';' || c == '#') {
  68                                comment = 1;
  69                                continue;
  70                        }
  71                }
  72                if (space) {
  73                        if (len)
  74                                value[len++] = ' ';
  75                        space = 0;
  76                }
  77                if (c == '\\') {
  78                        c = get_next_char();
  79                        switch (c) {
  80                        case '\n':
  81                                continue;
  82                        case 't':
  83                                c = '\t';
  84                                break;
  85                        case 'b':
  86                                c = '\b';
  87                                break;
  88                        case 'n':
  89                                c = '\n';
  90                                break;
  91                        /* Some characters escape as themselves */
  92                        case '\\': case '"':
  93                                break;
  94                        /* Reject unknown escape sequences */
  95                        default:
  96                                return NULL;
  97                        }
  98                        value[len++] = c;
  99                        continue;
 100                }
 101                if (c == '"') {
 102                        quote = 1-quote;
 103                        continue;
 104                }
 105                value[len++] = c;
 106        }
 107}
 108
 109static inline int iskeychar(int c)
 110{
 111        return isalnum(c) || c == '-';
 112}
 113
 114static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)
 115{
 116        int c;
 117        char *value;
 118
 119        /* Get the full name */
 120        for (;;) {
 121                c = get_next_char();
 122                if (config_file_eof)
 123                        break;
 124                if (!iskeychar(c))
 125                        break;
 126                name[len++] = tolower(c);
 127                if (len >= MAXNAME)
 128                        return -1;
 129        }
 130        name[len] = 0;
 131        while (c == ' ' || c == '\t')
 132                c = get_next_char();
 133
 134        value = NULL;
 135        if (c != '\n') {
 136                if (c != '=')
 137                        return -1;
 138                value = parse_value();
 139                if (!value)
 140                        return -1;
 141        }
 142        return fn(name, value, data);
 143}
 144
 145static int get_extended_base_var(char *name, int baselen, int c)
 146{
 147        do {
 148                if (c == '\n')
 149                        return -1;
 150                c = get_next_char();
 151        } while (isspace(c));
 152
 153        /* We require the format to be '[base "extension"]' */
 154        if (c != '"')
 155                return -1;
 156        name[baselen++] = '.';
 157
 158        for (;;) {
 159                int c = get_next_char();
 160                if (c == '\n')
 161                        return -1;
 162                if (c == '"')
 163                        break;
 164                if (c == '\\') {
 165                        c = get_next_char();
 166                        if (c == '\n')
 167                                return -1;
 168                }
 169                name[baselen++] = c;
 170                if (baselen > MAXNAME / 2)
 171                        return -1;
 172        }
 173
 174        /* Final ']' */
 175        if (get_next_char() != ']')
 176                return -1;
 177        return baselen;
 178}
 179
 180static int get_base_var(char *name)
 181{
 182        int baselen = 0;
 183
 184        for (;;) {
 185                int c = get_next_char();
 186                if (config_file_eof)
 187                        return -1;
 188                if (c == ']')
 189                        return baselen;
 190                if (isspace(c))
 191                        return get_extended_base_var(name, baselen, c);
 192                if (!iskeychar(c) && c != '.')
 193                        return -1;
 194                if (baselen > MAXNAME / 2)
 195                        return -1;
 196                name[baselen++] = tolower(c);
 197        }
 198}
 199
 200static int git_parse_file(config_fn_t fn, void *data)
 201{
 202        int comment = 0;
 203        int baselen = 0;
 204        static char var[MAXNAME];
 205
 206        for (;;) {
 207                int c = get_next_char();
 208                if (c == '\n') {
 209                        if (config_file_eof)
 210                                return 0;
 211                        comment = 0;
 212                        continue;
 213                }
 214                if (comment || isspace(c))
 215                        continue;
 216                if (c == '#' || c == ';') {
 217                        comment = 1;
 218                        continue;
 219                }
 220                if (c == '[') {
 221                        baselen = get_base_var(var);
 222                        if (baselen <= 0)
 223                                break;
 224                        var[baselen++] = '.';
 225                        var[baselen] = 0;
 226                        continue;
 227                }
 228                if (!isalpha(c))
 229                        break;
 230                var[baselen] = tolower(c);
 231                if (get_value(fn, data, var, baselen+1) < 0)
 232                        break;
 233        }
 234        die("bad config file line %d in %s", config_linenr, config_file_name);
 235}
 236
 237static int parse_unit_factor(const char *end, unsigned long *val)
 238{
 239        if (!*end)
 240                return 1;
 241        else if (!strcasecmp(end, "k")) {
 242                *val *= 1024;
 243                return 1;
 244        }
 245        else if (!strcasecmp(end, "m")) {
 246                *val *= 1024 * 1024;
 247                return 1;
 248        }
 249        else if (!strcasecmp(end, "g")) {
 250                *val *= 1024 * 1024 * 1024;
 251                return 1;
 252        }
 253        return 0;
 254}
 255
 256int git_parse_long(const char *value, long *ret)
 257{
 258        if (value && *value) {
 259                char *end;
 260                long val = strtol(value, &end, 0);
 261                unsigned long factor = 1;
 262                if (!parse_unit_factor(end, &factor))
 263                        return 0;
 264                *ret = val * factor;
 265                return 1;
 266        }
 267        return 0;
 268}
 269
 270int git_parse_ulong(const char *value, unsigned long *ret)
 271{
 272        if (value && *value) {
 273                char *end;
 274                unsigned long val = strtoul(value, &end, 0);
 275                if (!parse_unit_factor(end, &val))
 276                        return 0;
 277                *ret = val;
 278                return 1;
 279        }
 280        return 0;
 281}
 282
 283static void die_bad_config(const char *name)
 284{
 285        if (config_file_name)
 286                die("bad config value for '%s' in %s", name, config_file_name);
 287        die("bad config value for '%s'", name);
 288}
 289
 290int git_config_int(const char *name, const char *value)
 291{
 292        long ret;
 293        if (!git_parse_long(value, &ret))
 294                die_bad_config(name);
 295        return ret;
 296}
 297
 298unsigned long git_config_ulong(const char *name, const char *value)
 299{
 300        unsigned long ret;
 301        if (!git_parse_ulong(value, &ret))
 302                die_bad_config(name);
 303        return ret;
 304}
 305
 306int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 307{
 308        *is_bool = 1;
 309        if (!value)
 310                return 1;
 311        if (!*value)
 312                return 0;
 313        if (!strcasecmp(value, "true") || !strcasecmp(value, "yes"))
 314                return 1;
 315        if (!strcasecmp(value, "false") || !strcasecmp(value, "no"))
 316                return 0;
 317        *is_bool = 0;
 318        return git_config_int(name, value);
 319}
 320
 321int git_config_bool(const char *name, const char *value)
 322{
 323        int discard;
 324        return !!git_config_bool_or_int(name, value, &discard);
 325}
 326
 327int git_config_string(const char **dest, const char *var, const char *value)
 328{
 329        if (!value)
 330                return config_error_nonbool(var);
 331        *dest = xstrdup(value);
 332        return 0;
 333}
 334
 335static int git_default_core_config(const char *var, const char *value)
 336{
 337        /* This needs a better name */
 338        if (!strcmp(var, "core.filemode")) {
 339                trust_executable_bit = git_config_bool(var, value);
 340                return 0;
 341        }
 342
 343        if (!strcmp(var, "core.quotepath")) {
 344                quote_path_fully = git_config_bool(var, value);
 345                return 0;
 346        }
 347
 348        if (!strcmp(var, "core.symlinks")) {
 349                has_symlinks = git_config_bool(var, value);
 350                return 0;
 351        }
 352
 353        if (!strcmp(var, "core.ignorecase")) {
 354                ignore_case = git_config_bool(var, value);
 355                return 0;
 356        }
 357
 358        if (!strcmp(var, "core.bare")) {
 359                is_bare_repository_cfg = git_config_bool(var, value);
 360                return 0;
 361        }
 362
 363        if (!strcmp(var, "core.ignorestat")) {
 364                assume_unchanged = git_config_bool(var, value);
 365                return 0;
 366        }
 367
 368        if (!strcmp(var, "core.prefersymlinkrefs")) {
 369                prefer_symlink_refs = git_config_bool(var, value);
 370                return 0;
 371        }
 372
 373        if (!strcmp(var, "core.logallrefupdates")) {
 374                log_all_ref_updates = git_config_bool(var, value);
 375                return 0;
 376        }
 377
 378        if (!strcmp(var, "core.warnambiguousrefs")) {
 379                warn_ambiguous_refs = git_config_bool(var, value);
 380                return 0;
 381        }
 382
 383        if (!strcmp(var, "core.loosecompression")) {
 384                int level = git_config_int(var, value);
 385                if (level == -1)
 386                        level = Z_DEFAULT_COMPRESSION;
 387                else if (level < 0 || level > Z_BEST_COMPRESSION)
 388                        die("bad zlib compression level %d", level);
 389                zlib_compression_level = level;
 390                zlib_compression_seen = 1;
 391                return 0;
 392        }
 393
 394        if (!strcmp(var, "core.compression")) {
 395                int level = git_config_int(var, value);
 396                if (level == -1)
 397                        level = Z_DEFAULT_COMPRESSION;
 398                else if (level < 0 || level > Z_BEST_COMPRESSION)
 399                        die("bad zlib compression level %d", level);
 400                core_compression_level = level;
 401                core_compression_seen = 1;
 402                if (!zlib_compression_seen)
 403                        zlib_compression_level = level;
 404                return 0;
 405        }
 406
 407        if (!strcmp(var, "core.packedgitwindowsize")) {
 408                int pgsz_x2 = getpagesize() * 2;
 409                packed_git_window_size = git_config_int(var, value);
 410
 411                /* This value must be multiple of (pagesize * 2) */
 412                packed_git_window_size /= pgsz_x2;
 413                if (packed_git_window_size < 1)
 414                        packed_git_window_size = 1;
 415                packed_git_window_size *= pgsz_x2;
 416                return 0;
 417        }
 418
 419        if (!strcmp(var, "core.packedgitlimit")) {
 420                packed_git_limit = git_config_int(var, value);
 421                return 0;
 422        }
 423
 424        if (!strcmp(var, "core.deltabasecachelimit")) {
 425                delta_base_cache_limit = git_config_int(var, value);
 426                return 0;
 427        }
 428
 429        if (!strcmp(var, "core.autocrlf")) {
 430                if (value && !strcasecmp(value, "input")) {
 431                        auto_crlf = -1;
 432                        return 0;
 433                }
 434                auto_crlf = git_config_bool(var, value);
 435                return 0;
 436        }
 437
 438        if (!strcmp(var, "core.safecrlf")) {
 439                if (value && !strcasecmp(value, "warn")) {
 440                        safe_crlf = SAFE_CRLF_WARN;
 441                        return 0;
 442                }
 443                safe_crlf = git_config_bool(var, value);
 444                return 0;
 445        }
 446
 447        if (!strcmp(var, "core.pager"))
 448                return git_config_string(&pager_program, var, value);
 449
 450        if (!strcmp(var, "core.editor"))
 451                return git_config_string(&editor_program, var, value);
 452
 453        if (!strcmp(var, "core.excludesfile"))
 454                return git_config_string(&excludes_file, var, value);
 455
 456        if (!strcmp(var, "core.whitespace")) {
 457                if (!value)
 458                        return config_error_nonbool(var);
 459                whitespace_rule_cfg = parse_whitespace_rule(value);
 460                return 0;
 461        }
 462
 463        /* Add other config variables here and to Documentation/config.txt. */
 464        return 0;
 465}
 466
 467int git_default_config(const char *var, const char *value, void *dummy)
 468{
 469        if (!prefixcmp(var, "core."))
 470                return git_default_core_config(var, value);
 471
 472        if (!strcmp(var, "user.name")) {
 473                if (!value)
 474                        return config_error_nonbool(var);
 475                strlcpy(git_default_name, value, sizeof(git_default_name));
 476                if (git_default_email[0])
 477                        user_ident_explicitly_given = 1;
 478                return 0;
 479        }
 480
 481        if (!strcmp(var, "user.email")) {
 482                if (!value)
 483                        return config_error_nonbool(var);
 484                strlcpy(git_default_email, value, sizeof(git_default_email));
 485                if (git_default_name[0])
 486                        user_ident_explicitly_given = 1;
 487                return 0;
 488        }
 489
 490        if (!strcmp(var, "i18n.commitencoding"))
 491                return git_config_string(&git_commit_encoding, var, value);
 492
 493        if (!strcmp(var, "i18n.logoutputencoding"))
 494                return git_config_string(&git_log_output_encoding, var, value);
 495
 496        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 497                pager_use_color = git_config_bool(var,value);
 498                return 0;
 499        }
 500
 501        if (!strcmp(var, "branch.autosetupmerge")) {
 502                if (value && !strcasecmp(value, "always")) {
 503                        git_branch_track = BRANCH_TRACK_ALWAYS;
 504                        return 0;
 505                }
 506                git_branch_track = git_config_bool(var, value);
 507                return 0;
 508        }
 509        if (!strcmp(var, "branch.autosetuprebase")) {
 510                if (!value)
 511                        return config_error_nonbool(var);
 512                else if (!strcmp(value, "never"))
 513                        autorebase = AUTOREBASE_NEVER;
 514                else if (!strcmp(value, "local"))
 515                        autorebase = AUTOREBASE_LOCAL;
 516                else if (!strcmp(value, "remote"))
 517                        autorebase = AUTOREBASE_REMOTE;
 518                else if (!strcmp(value, "always"))
 519                        autorebase = AUTOREBASE_ALWAYS;
 520                else
 521                        return error("Malformed value for %s", var);
 522                return 0;
 523        }
 524
 525        /* Add other config variables here and to Documentation/config.txt. */
 526        return 0;
 527}
 528
 529int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 530{
 531        int ret;
 532        FILE *f = fopen(filename, "r");
 533
 534        ret = -1;
 535        if (f) {
 536                config_file = f;
 537                config_file_name = filename;
 538                config_linenr = 1;
 539                config_file_eof = 0;
 540                ret = git_parse_file(fn, data);
 541                fclose(f);
 542                config_file_name = NULL;
 543        }
 544        return ret;
 545}
 546
 547const char *git_etc_gitconfig(void)
 548{
 549        static const char *system_wide;
 550        if (!system_wide) {
 551                system_wide = ETC_GITCONFIG;
 552                if (!is_absolute_path(system_wide)) {
 553                        /* interpret path relative to exec-dir */
 554                        struct strbuf d = STRBUF_INIT;
 555                        strbuf_addf(&d, "%s/%s", git_exec_path(), system_wide);
 556                        system_wide = strbuf_detach(&d, NULL);
 557                }
 558        }
 559        return system_wide;
 560}
 561
 562int git_env_bool(const char *k, int def)
 563{
 564        const char *v = getenv(k);
 565        return v ? git_config_bool(k, v) : def;
 566}
 567
 568int git_config_system(void)
 569{
 570        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 571}
 572
 573int git_config_global(void)
 574{
 575        return !git_env_bool("GIT_CONFIG_NOGLOBAL", 0);
 576}
 577
 578int git_config(config_fn_t fn, void *data)
 579{
 580        int ret = 0;
 581        char *repo_config = NULL;
 582        const char *home = NULL, *filename;
 583
 584        /* $GIT_CONFIG makes git read _only_ the given config file,
 585         * $GIT_CONFIG_LOCAL will make it process it in addition to the
 586         * global config file, the same way it would the per-repository
 587         * config file otherwise. */
 588        filename = getenv(CONFIG_ENVIRONMENT);
 589        if (!filename) {
 590                if (git_config_system() && !access(git_etc_gitconfig(), R_OK))
 591                        ret += git_config_from_file(fn, git_etc_gitconfig(),
 592                                data);
 593                home = getenv("HOME");
 594                filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
 595                if (!filename)
 596                        filename = repo_config = xstrdup(git_path("config"));
 597        }
 598
 599        if (git_config_global() && home) {
 600                char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
 601                if (!access(user_config, R_OK))
 602                        ret = git_config_from_file(fn, user_config, data);
 603                free(user_config);
 604        }
 605
 606        ret += git_config_from_file(fn, filename, data);
 607        free(repo_config);
 608        return ret;
 609}
 610
 611/*
 612 * Find all the stuff for git_config_set() below.
 613 */
 614
 615#define MAX_MATCHES 512
 616
 617static struct {
 618        int baselen;
 619        char* key;
 620        int do_not_match;
 621        regex_t* value_regex;
 622        int multi_replace;
 623        size_t offset[MAX_MATCHES];
 624        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
 625        int seen;
 626} store;
 627
 628static int matches(const char* key, const char* value)
 629{
 630        return !strcmp(key, store.key) &&
 631                (store.value_regex == NULL ||
 632                 (store.do_not_match ^
 633                  !regexec(store.value_regex, value, 0, NULL, 0)));
 634}
 635
 636static int store_aux(const char* key, const char* value, void *cb)
 637{
 638        const char *ep;
 639        size_t section_len;
 640
 641        switch (store.state) {
 642        case KEY_SEEN:
 643                if (matches(key, value)) {
 644                        if (store.seen == 1 && store.multi_replace == 0) {
 645                                warning("%s has multiple values", key);
 646                        } else if (store.seen >= MAX_MATCHES) {
 647                                error("too many matches for %s", key);
 648                                return 1;
 649                        }
 650
 651                        store.offset[store.seen] = ftell(config_file);
 652                        store.seen++;
 653                }
 654                break;
 655        case SECTION_SEEN:
 656                /*
 657                 * What we are looking for is in store.key (both
 658                 * section and var), and its section part is baselen
 659                 * long.  We found key (again, both section and var).
 660                 * We would want to know if this key is in the same
 661                 * section as what we are looking for.  We already
 662                 * know we are in the same section as what should
 663                 * hold store.key.
 664                 */
 665                ep = strrchr(key, '.');
 666                section_len = ep - key;
 667
 668                if ((section_len != store.baselen) ||
 669                    memcmp(key, store.key, section_len+1)) {
 670                        store.state = SECTION_END_SEEN;
 671                        break;
 672                }
 673
 674                /*
 675                 * Do not increment matches: this is no match, but we
 676                 * just made sure we are in the desired section.
 677                 */
 678                store.offset[store.seen] = ftell(config_file);
 679                /* fallthru */
 680        case SECTION_END_SEEN:
 681        case START:
 682                if (matches(key, value)) {
 683                        store.offset[store.seen] = ftell(config_file);
 684                        store.state = KEY_SEEN;
 685                        store.seen++;
 686                } else {
 687                        if (strrchr(key, '.') - key == store.baselen &&
 688                              !strncmp(key, store.key, store.baselen)) {
 689                                        store.state = SECTION_SEEN;
 690                                        store.offset[store.seen] = ftell(config_file);
 691                        }
 692                }
 693        }
 694        return 0;
 695}
 696
 697static int write_error(const char *filename)
 698{
 699        error("failed to write new configuration file %s", filename);
 700
 701        /* Same error code as "failed to rename". */
 702        return 4;
 703}
 704
 705static int store_write_section(int fd, const char* key)
 706{
 707        const char *dot;
 708        int i, success;
 709        struct strbuf sb;
 710
 711        strbuf_init(&sb, 0);
 712        dot = memchr(key, '.', store.baselen);
 713        if (dot) {
 714                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
 715                for (i = dot - key + 1; i < store.baselen; i++) {
 716                        if (key[i] == '"' || key[i] == '\\')
 717                                strbuf_addch(&sb, '\\');
 718                        strbuf_addch(&sb, key[i]);
 719                }
 720                strbuf_addstr(&sb, "\"]\n");
 721        } else {
 722                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
 723        }
 724
 725        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
 726        strbuf_release(&sb);
 727
 728        return success;
 729}
 730
 731static int store_write_pair(int fd, const char* key, const char* value)
 732{
 733        int i, success;
 734        int length = strlen(key + store.baselen + 1);
 735        const char *quote = "";
 736        struct strbuf sb;
 737
 738        /*
 739         * Check to see if the value needs to be surrounded with a dq pair.
 740         * Note that problematic characters are always backslash-quoted; this
 741         * check is about not losing leading or trailing SP and strings that
 742         * follow beginning-of-comment characters (i.e. ';' and '#') by the
 743         * configuration parser.
 744         */
 745        if (value[0] == ' ')
 746                quote = "\"";
 747        for (i = 0; value[i]; i++)
 748                if (value[i] == ';' || value[i] == '#')
 749                        quote = "\"";
 750        if (i && value[i - 1] == ' ')
 751                quote = "\"";
 752
 753        strbuf_init(&sb, 0);
 754        strbuf_addf(&sb, "\t%.*s = %s",
 755                    length, key + store.baselen + 1, quote);
 756
 757        for (i = 0; value[i]; i++)
 758                switch (value[i]) {
 759                case '\n':
 760                        strbuf_addstr(&sb, "\\n");
 761                        break;
 762                case '\t':
 763                        strbuf_addstr(&sb, "\\t");
 764                        break;
 765                case '"':
 766                case '\\':
 767                        strbuf_addch(&sb, '\\');
 768                default:
 769                        strbuf_addch(&sb, value[i]);
 770                        break;
 771                }
 772        strbuf_addf(&sb, "%s\n", quote);
 773
 774        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
 775        strbuf_release(&sb);
 776
 777        return success;
 778}
 779
 780static ssize_t find_beginning_of_line(const char* contents, size_t size,
 781        size_t offset_, int* found_bracket)
 782{
 783        size_t equal_offset = size, bracket_offset = size;
 784        ssize_t offset;
 785
 786contline:
 787        for (offset = offset_-2; offset > 0
 788                        && contents[offset] != '\n'; offset--)
 789                switch (contents[offset]) {
 790                        case '=': equal_offset = offset; break;
 791                        case ']': bracket_offset = offset; break;
 792                }
 793        if (offset > 0 && contents[offset-1] == '\\') {
 794                offset_ = offset;
 795                goto contline;
 796        }
 797        if (bracket_offset < equal_offset) {
 798                *found_bracket = 1;
 799                offset = bracket_offset+1;
 800        } else
 801                offset++;
 802
 803        return offset;
 804}
 805
 806int git_config_set(const char* key, const char* value)
 807{
 808        return git_config_set_multivar(key, value, NULL, 0);
 809}
 810
 811/*
 812 * If value==NULL, unset in (remove from) config,
 813 * if value_regex!=NULL, disregard key/value pairs where value does not match.
 814 * if multi_replace==0, nothing, or only one matching key/value is replaced,
 815 *     else all matching key/values (regardless how many) are removed,
 816 *     before the new pair is written.
 817 *
 818 * Returns 0 on success.
 819 *
 820 * This function does this:
 821 *
 822 * - it locks the config file by creating ".git/config.lock"
 823 *
 824 * - it then parses the config using store_aux() as validator to find
 825 *   the position on the key/value pair to replace. If it is to be unset,
 826 *   it must be found exactly once.
 827 *
 828 * - the config file is mmap()ed and the part before the match (if any) is
 829 *   written to the lock file, then the changed part and the rest.
 830 *
 831 * - the config file is removed and the lock file rename()d to it.
 832 *
 833 */
 834int git_config_set_multivar(const char* key, const char* value,
 835        const char* value_regex, int multi_replace)
 836{
 837        int i, dot;
 838        int fd = -1, in_fd;
 839        int ret;
 840        char* config_filename;
 841        struct lock_file *lock = NULL;
 842        const char* last_dot = strrchr(key, '.');
 843
 844        config_filename = getenv(CONFIG_ENVIRONMENT);
 845        if (!config_filename) {
 846                config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
 847                if (!config_filename)
 848                        config_filename  = git_path("config");
 849        }
 850        config_filename = xstrdup(config_filename);
 851
 852        /*
 853         * Since "key" actually contains the section name and the real
 854         * key name separated by a dot, we have to know where the dot is.
 855         */
 856
 857        if (last_dot == NULL) {
 858                error("key does not contain a section: %s", key);
 859                ret = 2;
 860                goto out_free;
 861        }
 862        store.baselen = last_dot - key;
 863
 864        store.multi_replace = multi_replace;
 865
 866        /*
 867         * Validate the key and while at it, lower case it for matching.
 868         */
 869        store.key = xmalloc(strlen(key) + 1);
 870        dot = 0;
 871        for (i = 0; key[i]; i++) {
 872                unsigned char c = key[i];
 873                if (c == '.')
 874                        dot = 1;
 875                /* Leave the extended basename untouched.. */
 876                if (!dot || i > store.baselen) {
 877                        if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
 878                                error("invalid key: %s", key);
 879                                free(store.key);
 880                                ret = 1;
 881                                goto out_free;
 882                        }
 883                        c = tolower(c);
 884                } else if (c == '\n') {
 885                        error("invalid key (newline): %s", key);
 886                        free(store.key);
 887                        ret = 1;
 888                        goto out_free;
 889                }
 890                store.key[i] = c;
 891        }
 892        store.key[i] = 0;
 893
 894        /*
 895         * The lock serves a purpose in addition to locking: the new
 896         * contents of .git/config will be written into it.
 897         */
 898        lock = xcalloc(sizeof(struct lock_file), 1);
 899        fd = hold_lock_file_for_update(lock, config_filename, 0);
 900        if (fd < 0) {
 901                error("could not lock config file %s", config_filename);
 902                free(store.key);
 903                ret = -1;
 904                goto out_free;
 905        }
 906
 907        /*
 908         * If .git/config does not exist yet, write a minimal version.
 909         */
 910        in_fd = open(config_filename, O_RDONLY);
 911        if ( in_fd < 0 ) {
 912                free(store.key);
 913
 914                if ( ENOENT != errno ) {
 915                        error("opening %s: %s", config_filename,
 916                              strerror(errno));
 917                        ret = 3; /* same as "invalid config file" */
 918                        goto out_free;
 919                }
 920                /* if nothing to unset, error out */
 921                if (value == NULL) {
 922                        ret = 5;
 923                        goto out_free;
 924                }
 925
 926                store.key = (char*)key;
 927                if (!store_write_section(fd, key) ||
 928                    !store_write_pair(fd, key, value))
 929                        goto write_err_out;
 930        } else {
 931                struct stat st;
 932                char* contents;
 933                size_t contents_sz, copy_begin, copy_end;
 934                int i, new_line = 0;
 935
 936                if (value_regex == NULL)
 937                        store.value_regex = NULL;
 938                else {
 939                        if (value_regex[0] == '!') {
 940                                store.do_not_match = 1;
 941                                value_regex++;
 942                        } else
 943                                store.do_not_match = 0;
 944
 945                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
 946                        if (regcomp(store.value_regex, value_regex,
 947                                        REG_EXTENDED)) {
 948                                error("invalid pattern: %s", value_regex);
 949                                free(store.value_regex);
 950                                ret = 6;
 951                                goto out_free;
 952                        }
 953                }
 954
 955                store.offset[0] = 0;
 956                store.state = START;
 957                store.seen = 0;
 958
 959                /*
 960                 * After this, store.offset will contain the *end* offset
 961                 * of the last match, or remain at 0 if no match was found.
 962                 * As a side effect, we make sure to transform only a valid
 963                 * existing config file.
 964                 */
 965                if (git_config_from_file(store_aux, config_filename, NULL)) {
 966                        error("invalid config file %s", config_filename);
 967                        free(store.key);
 968                        if (store.value_regex != NULL) {
 969                                regfree(store.value_regex);
 970                                free(store.value_regex);
 971                        }
 972                        ret = 3;
 973                        goto out_free;
 974                }
 975
 976                free(store.key);
 977                if (store.value_regex != NULL) {
 978                        regfree(store.value_regex);
 979                        free(store.value_regex);
 980                }
 981
 982                /* if nothing to unset, or too many matches, error out */
 983                if ((store.seen == 0 && value == NULL) ||
 984                                (store.seen > 1 && multi_replace == 0)) {
 985                        ret = 5;
 986                        goto out_free;
 987                }
 988
 989                fstat(in_fd, &st);
 990                contents_sz = xsize_t(st.st_size);
 991                contents = xmmap(NULL, contents_sz, PROT_READ,
 992                        MAP_PRIVATE, in_fd, 0);
 993                close(in_fd);
 994
 995                if (store.seen == 0)
 996                        store.seen = 1;
 997
 998                for (i = 0, copy_begin = 0; i < store.seen; i++) {
 999                        if (store.offset[i] == 0) {
1000                                store.offset[i] = copy_end = contents_sz;
1001                        } else if (store.state != KEY_SEEN) {
1002                                copy_end = store.offset[i];
1003                        } else
1004                                copy_end = find_beginning_of_line(
1005                                        contents, contents_sz,
1006                                        store.offset[i]-2, &new_line);
1007
1008                        if (copy_end > 0 && contents[copy_end-1] != '\n')
1009                                new_line = 1;
1010
1011                        /* write the first part of the config */
1012                        if (copy_end > copy_begin) {
1013                                if (write_in_full(fd, contents + copy_begin,
1014                                                  copy_end - copy_begin) <
1015                                    copy_end - copy_begin)
1016                                        goto write_err_out;
1017                                if (new_line &&
1018                                    write_in_full(fd, "\n", 1) != 1)
1019                                        goto write_err_out;
1020                        }
1021                        copy_begin = store.offset[i];
1022                }
1023
1024                /* write the pair (value == NULL means unset) */
1025                if (value != NULL) {
1026                        if (store.state == START) {
1027                                if (!store_write_section(fd, key))
1028                                        goto write_err_out;
1029                        }
1030                        if (!store_write_pair(fd, key, value))
1031                                goto write_err_out;
1032                }
1033
1034                /* write the rest of the config */
1035                if (copy_begin < contents_sz)
1036                        if (write_in_full(fd, contents + copy_begin,
1037                                          contents_sz - copy_begin) <
1038                            contents_sz - copy_begin)
1039                                goto write_err_out;
1040
1041                munmap(contents, contents_sz);
1042        }
1043
1044        if (commit_lock_file(lock) < 0) {
1045                error("could not commit config file %s", config_filename);
1046                ret = 4;
1047                goto out_free;
1048        }
1049
1050        /*
1051         * lock is committed, so don't try to roll it back below.
1052         * NOTE: Since lockfile.c keeps a linked list of all created
1053         * lock_file structures, it isn't safe to free(lock).  It's
1054         * better to just leave it hanging around.
1055         */
1056        lock = NULL;
1057        ret = 0;
1058
1059out_free:
1060        if (lock)
1061                rollback_lock_file(lock);
1062        free(config_filename);
1063        return ret;
1064
1065write_err_out:
1066        ret = write_error(lock->filename);
1067        goto out_free;
1068
1069}
1070
1071static int section_name_match (const char *buf, const char *name)
1072{
1073        int i = 0, j = 0, dot = 0;
1074        for (; buf[i] && buf[i] != ']'; i++) {
1075                if (!dot && isspace(buf[i])) {
1076                        dot = 1;
1077                        if (name[j++] != '.')
1078                                break;
1079                        for (i++; isspace(buf[i]); i++)
1080                                ; /* do nothing */
1081                        if (buf[i] != '"')
1082                                break;
1083                        continue;
1084                }
1085                if (buf[i] == '\\' && dot)
1086                        i++;
1087                else if (buf[i] == '"' && dot) {
1088                        for (i++; isspace(buf[i]); i++)
1089                                ; /* do_nothing */
1090                        break;
1091                }
1092                if (buf[i] != name[j++])
1093                        break;
1094        }
1095        return (buf[i] == ']' && name[j] == 0);
1096}
1097
1098/* if new_name == NULL, the section is removed instead */
1099int git_config_rename_section(const char *old_name, const char *new_name)
1100{
1101        int ret = 0, remove = 0;
1102        char *config_filename;
1103        struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1104        int out_fd;
1105        char buf[1024];
1106
1107        config_filename = getenv(CONFIG_ENVIRONMENT);
1108        if (!config_filename) {
1109                config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
1110                if (!config_filename)
1111                        config_filename  = git_path("config");
1112        }
1113        config_filename = xstrdup(config_filename);
1114        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1115        if (out_fd < 0) {
1116                ret = error("could not lock config file %s", config_filename);
1117                goto out;
1118        }
1119
1120        if (!(config_file = fopen(config_filename, "rb"))) {
1121                /* no config file means nothing to rename, no error */
1122                goto unlock_and_out;
1123        }
1124
1125        while (fgets(buf, sizeof(buf), config_file)) {
1126                int i;
1127                int length;
1128                for (i = 0; buf[i] && isspace(buf[i]); i++)
1129                        ; /* do nothing */
1130                if (buf[i] == '[') {
1131                        /* it's a section */
1132                        if (section_name_match (&buf[i+1], old_name)) {
1133                                ret++;
1134                                if (new_name == NULL) {
1135                                        remove = 1;
1136                                        continue;
1137                                }
1138                                store.baselen = strlen(new_name);
1139                                if (!store_write_section(out_fd, new_name)) {
1140                                        ret = write_error(lock->filename);
1141                                        goto out;
1142                                }
1143                                continue;
1144                        }
1145                        remove = 0;
1146                }
1147                if (remove)
1148                        continue;
1149                length = strlen(buf);
1150                if (write_in_full(out_fd, buf, length) != length) {
1151                        ret = write_error(lock->filename);
1152                        goto out;
1153                }
1154        }
1155        fclose(config_file);
1156 unlock_and_out:
1157        if (commit_lock_file(lock) < 0)
1158                ret = error("could not commit config file %s", config_filename);
1159 out:
1160        free(config_filename);
1161        return ret;
1162}
1163
1164/*
1165 * Call this to report error for your variable that should not
1166 * get a boolean value (i.e. "[my] var" means "true").
1167 */
1168int config_error_nonbool(const char *var)
1169{
1170        return error("Missing value for '%s'", var);
1171}