Andrew's git / gitweb.git / config.c
?
config.con commit Allow tracking branches to set up rebase by default. (c998ae9)
   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, 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);
 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)
 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, 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
 335int git_default_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.bare")) {
 354                is_bare_repository_cfg = git_config_bool(var, value);
 355                return 0;
 356        }
 357
 358        if (!strcmp(var, "core.ignorestat")) {
 359                assume_unchanged = git_config_bool(var, value);
 360                return 0;
 361        }
 362
 363        if (!strcmp(var, "core.prefersymlinkrefs")) {
 364                prefer_symlink_refs = git_config_bool(var, value);
 365                return 0;
 366        }
 367
 368        if (!strcmp(var, "core.logallrefupdates")) {
 369                log_all_ref_updates = git_config_bool(var, value);
 370                return 0;
 371        }
 372
 373        if (!strcmp(var, "core.warnambiguousrefs")) {
 374                warn_ambiguous_refs = git_config_bool(var, value);
 375                return 0;
 376        }
 377
 378        if (!strcmp(var, "core.loosecompression")) {
 379                int level = git_config_int(var, value);
 380                if (level == -1)
 381                        level = Z_DEFAULT_COMPRESSION;
 382                else if (level < 0 || level > Z_BEST_COMPRESSION)
 383                        die("bad zlib compression level %d", level);
 384                zlib_compression_level = level;
 385                zlib_compression_seen = 1;
 386                return 0;
 387        }
 388
 389        if (!strcmp(var, "core.compression")) {
 390                int level = git_config_int(var, value);
 391                if (level == -1)
 392                        level = Z_DEFAULT_COMPRESSION;
 393                else if (level < 0 || level > Z_BEST_COMPRESSION)
 394                        die("bad zlib compression level %d", level);
 395                core_compression_level = level;
 396                core_compression_seen = 1;
 397                if (!zlib_compression_seen)
 398                        zlib_compression_level = level;
 399                return 0;
 400        }
 401
 402        if (!strcmp(var, "core.packedgitwindowsize")) {
 403                int pgsz_x2 = getpagesize() * 2;
 404                packed_git_window_size = git_config_int(var, value);
 405
 406                /* This value must be multiple of (pagesize * 2) */
 407                packed_git_window_size /= pgsz_x2;
 408                if (packed_git_window_size < 1)
 409                        packed_git_window_size = 1;
 410                packed_git_window_size *= pgsz_x2;
 411                return 0;
 412        }
 413
 414        if (!strcmp(var, "core.packedgitlimit")) {
 415                packed_git_limit = git_config_int(var, value);
 416                return 0;
 417        }
 418
 419        if (!strcmp(var, "core.deltabasecachelimit")) {
 420                delta_base_cache_limit = git_config_int(var, value);
 421                return 0;
 422        }
 423
 424        if (!strcmp(var, "core.autocrlf")) {
 425                if (value && !strcasecmp(value, "input")) {
 426                        auto_crlf = -1;
 427                        return 0;
 428                }
 429                auto_crlf = git_config_bool(var, value);
 430                return 0;
 431        }
 432
 433        if (!strcmp(var, "core.safecrlf")) {
 434                if (value && !strcasecmp(value, "warn")) {
 435                        safe_crlf = SAFE_CRLF_WARN;
 436                        return 0;
 437                }
 438                safe_crlf = git_config_bool(var, value);
 439                return 0;
 440        }
 441
 442        if (!strcmp(var, "user.name")) {
 443                if (!value)
 444                        return config_error_nonbool(var);
 445                strlcpy(git_default_name, value, sizeof(git_default_name));
 446                return 0;
 447        }
 448
 449        if (!strcmp(var, "user.email")) {
 450                if (!value)
 451                        return config_error_nonbool(var);
 452                strlcpy(git_default_email, value, sizeof(git_default_email));
 453                return 0;
 454        }
 455
 456        if (!strcmp(var, "i18n.commitencoding"))
 457                return git_config_string(&git_commit_encoding, var, value);
 458
 459        if (!strcmp(var, "i18n.logoutputencoding"))
 460                return git_config_string(&git_log_output_encoding, var, value);
 461
 462        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 463                pager_use_color = git_config_bool(var,value);
 464                return 0;
 465        }
 466
 467        if (!strcmp(var, "core.pager"))
 468                return git_config_string(&pager_program, var, value);
 469
 470        if (!strcmp(var, "core.editor"))
 471                return git_config_string(&editor_program, var, value);
 472
 473        if (!strcmp(var, "core.excludesfile"))
 474                return git_config_string(&excludes_file, var, value);
 475
 476        if (!strcmp(var, "core.whitespace")) {
 477                if (!value)
 478                        return config_error_nonbool(var);
 479                whitespace_rule_cfg = parse_whitespace_rule(value);
 480                return 0;
 481        }
 482        if (!strcmp(var, "branch.autosetupmerge")) {
 483                if (value && !strcasecmp(value, "always")) {
 484                        git_branch_track = BRANCH_TRACK_ALWAYS;
 485                        return 0;
 486                }
 487                git_branch_track = git_config_bool(var, value);
 488                return 0;
 489        }
 490        if (!strcmp(var, "branch.autosetuprebase")) {
 491                if (!value)
 492                        return config_error_nonbool(var);
 493                else if (!strcmp(value, "never"))
 494                        autorebase = AUTOREBASE_NEVER;
 495                else if (!strcmp(value, "local"))
 496                        autorebase = AUTOREBASE_LOCAL;
 497                else if (!strcmp(value, "remote"))
 498                        autorebase = AUTOREBASE_REMOTE;
 499                else if (!strcmp(value, "always"))
 500                        autorebase = AUTOREBASE_ALWAYS;
 501                else
 502                        return error("Malformed value for %s", var);
 503                return 0;
 504        }
 505
 506        /* Add other config variables here and to Documentation/config.txt. */
 507        return 0;
 508}
 509
 510int git_config_from_file(config_fn_t fn, const char *filename)
 511{
 512        int ret;
 513        FILE *f = fopen(filename, "r");
 514
 515        ret = -1;
 516        if (f) {
 517                config_file = f;
 518                config_file_name = filename;
 519                config_linenr = 1;
 520                config_file_eof = 0;
 521                ret = git_parse_file(fn);
 522                fclose(f);
 523                config_file_name = NULL;
 524        }
 525        return ret;
 526}
 527
 528const char *git_etc_gitconfig(void)
 529{
 530        static const char *system_wide;
 531        if (!system_wide) {
 532                system_wide = ETC_GITCONFIG;
 533                if (!is_absolute_path(system_wide)) {
 534                        /* interpret path relative to exec-dir */
 535                        struct strbuf d = STRBUF_INIT;
 536                        strbuf_addf(&d, "%s/%s", git_exec_path(), system_wide);
 537                        system_wide = strbuf_detach(&d, NULL);
 538                }
 539        }
 540        return system_wide;
 541}
 542
 543int git_env_bool(const char *k, int def)
 544{
 545        const char *v = getenv(k);
 546        return v ? git_config_bool(k, v) : def;
 547}
 548
 549int git_config_system(void)
 550{
 551        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 552}
 553
 554int git_config_global(void)
 555{
 556        return !git_env_bool("GIT_CONFIG_NOGLOBAL", 0);
 557}
 558
 559int git_config(config_fn_t fn)
 560{
 561        int ret = 0;
 562        char *repo_config = NULL;
 563        const char *home = NULL, *filename;
 564
 565        /* $GIT_CONFIG makes git read _only_ the given config file,
 566         * $GIT_CONFIG_LOCAL will make it process it in addition to the
 567         * global config file, the same way it would the per-repository
 568         * config file otherwise. */
 569        filename = getenv(CONFIG_ENVIRONMENT);
 570        if (!filename) {
 571                if (git_config_system() && !access(git_etc_gitconfig(), R_OK))
 572                        ret += git_config_from_file(fn, git_etc_gitconfig());
 573                home = getenv("HOME");
 574                filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
 575                if (!filename)
 576                        filename = repo_config = xstrdup(git_path("config"));
 577        }
 578
 579        if (git_config_global() && home) {
 580                char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
 581                if (!access(user_config, R_OK))
 582                        ret = git_config_from_file(fn, user_config);
 583                free(user_config);
 584        }
 585
 586        ret += git_config_from_file(fn, filename);
 587        free(repo_config);
 588        return ret;
 589}
 590
 591/*
 592 * Find all the stuff for git_config_set() below.
 593 */
 594
 595#define MAX_MATCHES 512
 596
 597static struct {
 598        int baselen;
 599        char* key;
 600        int do_not_match;
 601        regex_t* value_regex;
 602        int multi_replace;
 603        size_t offset[MAX_MATCHES];
 604        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
 605        int seen;
 606} store;
 607
 608static int matches(const char* key, const char* value)
 609{
 610        return !strcmp(key, store.key) &&
 611                (store.value_regex == NULL ||
 612                 (store.do_not_match ^
 613                  !regexec(store.value_regex, value, 0, NULL, 0)));
 614}
 615
 616static int store_aux(const char* key, const char* value)
 617{
 618        const char *ep;
 619        size_t section_len;
 620
 621        switch (store.state) {
 622        case KEY_SEEN:
 623                if (matches(key, value)) {
 624                        if (store.seen == 1 && store.multi_replace == 0) {
 625                                fprintf(stderr,
 626                                        "Warning: %s has multiple values\n",
 627                                        key);
 628                        } else if (store.seen >= MAX_MATCHES) {
 629                                fprintf(stderr, "Too many matches\n");
 630                                return 1;
 631                        }
 632
 633                        store.offset[store.seen] = ftell(config_file);
 634                        store.seen++;
 635                }
 636                break;
 637        case SECTION_SEEN:
 638                /*
 639                 * What we are looking for is in store.key (both
 640                 * section and var), and its section part is baselen
 641                 * long.  We found key (again, both section and var).
 642                 * We would want to know if this key is in the same
 643                 * section as what we are looking for.  We already
 644                 * know we are in the same section as what should
 645                 * hold store.key.
 646                 */
 647                ep = strrchr(key, '.');
 648                section_len = ep - key;
 649
 650                if ((section_len != store.baselen) ||
 651                    memcmp(key, store.key, section_len+1)) {
 652                        store.state = SECTION_END_SEEN;
 653                        break;
 654                }
 655
 656                /*
 657                 * Do not increment matches: this is no match, but we
 658                 * just made sure we are in the desired section.
 659                 */
 660                store.offset[store.seen] = ftell(config_file);
 661                /* fallthru */
 662        case SECTION_END_SEEN:
 663        case START:
 664                if (matches(key, value)) {
 665                        store.offset[store.seen] = ftell(config_file);
 666                        store.state = KEY_SEEN;
 667                        store.seen++;
 668                } else {
 669                        if (strrchr(key, '.') - key == store.baselen &&
 670                              !strncmp(key, store.key, store.baselen)) {
 671                                        store.state = SECTION_SEEN;
 672                                        store.offset[store.seen] = ftell(config_file);
 673                        }
 674                }
 675        }
 676        return 0;
 677}
 678
 679static int write_error(void)
 680{
 681        fprintf(stderr, "Failed to write new configuration file\n");
 682
 683        /* Same error code as "failed to rename". */
 684        return 4;
 685}
 686
 687static int store_write_section(int fd, const char* key)
 688{
 689        const char *dot;
 690        int i, success;
 691        struct strbuf sb;
 692
 693        strbuf_init(&sb, 0);
 694        dot = memchr(key, '.', store.baselen);
 695        if (dot) {
 696                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
 697                for (i = dot - key + 1; i < store.baselen; i++) {
 698                        if (key[i] == '"')
 699                                strbuf_addch(&sb, '\\');
 700                        strbuf_addch(&sb, key[i]);
 701                }
 702                strbuf_addstr(&sb, "\"]\n");
 703        } else {
 704                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
 705        }
 706
 707        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
 708        strbuf_release(&sb);
 709
 710        return success;
 711}
 712
 713static int store_write_pair(int fd, const char* key, const char* value)
 714{
 715        int i, success;
 716        int length = strlen(key + store.baselen + 1);
 717        const char *quote = "";
 718        struct strbuf sb;
 719
 720        /*
 721         * Check to see if the value needs to be surrounded with a dq pair.
 722         * Note that problematic characters are always backslash-quoted; this
 723         * check is about not losing leading or trailing SP and strings that
 724         * follow beginning-of-comment characters (i.e. ';' and '#') by the
 725         * configuration parser.
 726         */
 727        if (value[0] == ' ')
 728                quote = "\"";
 729        for (i = 0; value[i]; i++)
 730                if (value[i] == ';' || value[i] == '#')
 731                        quote = "\"";
 732        if (i && value[i - 1] == ' ')
 733                quote = "\"";
 734
 735        strbuf_init(&sb, 0);
 736        strbuf_addf(&sb, "\t%.*s = %s",
 737                    length, key + store.baselen + 1, quote);
 738
 739        for (i = 0; value[i]; i++)
 740                switch (value[i]) {
 741                case '\n':
 742                        strbuf_addstr(&sb, "\\n");
 743                        break;
 744                case '\t':
 745                        strbuf_addstr(&sb, "\\t");
 746                        break;
 747                case '"':
 748                case '\\':
 749                        strbuf_addch(&sb, '\\');
 750                default:
 751                        strbuf_addch(&sb, value[i]);
 752                        break;
 753                }
 754        strbuf_addf(&sb, "%s\n", quote);
 755
 756        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
 757        strbuf_release(&sb);
 758
 759        return success;
 760}
 761
 762static ssize_t find_beginning_of_line(const char* contents, size_t size,
 763        size_t offset_, int* found_bracket)
 764{
 765        size_t equal_offset = size, bracket_offset = size;
 766        ssize_t offset;
 767
 768contline:
 769        for (offset = offset_-2; offset > 0
 770                        && contents[offset] != '\n'; offset--)
 771                switch (contents[offset]) {
 772                        case '=': equal_offset = offset; break;
 773                        case ']': bracket_offset = offset; break;
 774                }
 775        if (offset > 0 && contents[offset-1] == '\\') {
 776                offset_ = offset;
 777                goto contline;
 778        }
 779        if (bracket_offset < equal_offset) {
 780                *found_bracket = 1;
 781                offset = bracket_offset+1;
 782        } else
 783                offset++;
 784
 785        return offset;
 786}
 787
 788int git_config_set(const char* key, const char* value)
 789{
 790        return git_config_set_multivar(key, value, NULL, 0);
 791}
 792
 793/*
 794 * If value==NULL, unset in (remove from) config,
 795 * if value_regex!=NULL, disregard key/value pairs where value does not match.
 796 * if multi_replace==0, nothing, or only one matching key/value is replaced,
 797 *     else all matching key/values (regardless how many) are removed,
 798 *     before the new pair is written.
 799 *
 800 * Returns 0 on success.
 801 *
 802 * This function does this:
 803 *
 804 * - it locks the config file by creating ".git/config.lock"
 805 *
 806 * - it then parses the config using store_aux() as validator to find
 807 *   the position on the key/value pair to replace. If it is to be unset,
 808 *   it must be found exactly once.
 809 *
 810 * - the config file is mmap()ed and the part before the match (if any) is
 811 *   written to the lock file, then the changed part and the rest.
 812 *
 813 * - the config file is removed and the lock file rename()d to it.
 814 *
 815 */
 816int git_config_set_multivar(const char* key, const char* value,
 817        const char* value_regex, int multi_replace)
 818{
 819        int i, dot;
 820        int fd = -1, in_fd;
 821        int ret;
 822        char* config_filename;
 823        struct lock_file *lock = NULL;
 824        const char* last_dot = strrchr(key, '.');
 825
 826        config_filename = getenv(CONFIG_ENVIRONMENT);
 827        if (!config_filename) {
 828                config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
 829                if (!config_filename)
 830                        config_filename  = git_path("config");
 831        }
 832        config_filename = xstrdup(config_filename);
 833
 834        /*
 835         * Since "key" actually contains the section name and the real
 836         * key name separated by a dot, we have to know where the dot is.
 837         */
 838
 839        if (last_dot == NULL) {
 840                fprintf(stderr, "key does not contain a section: %s\n", key);
 841                ret = 2;
 842                goto out_free;
 843        }
 844        store.baselen = last_dot - key;
 845
 846        store.multi_replace = multi_replace;
 847
 848        /*
 849         * Validate the key and while at it, lower case it for matching.
 850         */
 851        store.key = xmalloc(strlen(key) + 1);
 852        dot = 0;
 853        for (i = 0; key[i]; i++) {
 854                unsigned char c = key[i];
 855                if (c == '.')
 856                        dot = 1;
 857                /* Leave the extended basename untouched.. */
 858                if (!dot || i > store.baselen) {
 859                        if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
 860                                fprintf(stderr, "invalid key: %s\n", key);
 861                                free(store.key);
 862                                ret = 1;
 863                                goto out_free;
 864                        }
 865                        c = tolower(c);
 866                } else if (c == '\n') {
 867                        fprintf(stderr, "invalid key (newline): %s\n", key);
 868                        free(store.key);
 869                        ret = 1;
 870                        goto out_free;
 871                }
 872                store.key[i] = c;
 873        }
 874        store.key[i] = 0;
 875
 876        /*
 877         * The lock serves a purpose in addition to locking: the new
 878         * contents of .git/config will be written into it.
 879         */
 880        lock = xcalloc(sizeof(struct lock_file), 1);
 881        fd = hold_lock_file_for_update(lock, config_filename, 0);
 882        if (fd < 0) {
 883                fprintf(stderr, "could not lock config file\n");
 884                free(store.key);
 885                ret = -1;
 886                goto out_free;
 887        }
 888
 889        /*
 890         * If .git/config does not exist yet, write a minimal version.
 891         */
 892        in_fd = open(config_filename, O_RDONLY);
 893        if ( in_fd < 0 ) {
 894                free(store.key);
 895
 896                if ( ENOENT != errno ) {
 897                        error("opening %s: %s", config_filename,
 898                              strerror(errno));
 899                        ret = 3; /* same as "invalid config file" */
 900                        goto out_free;
 901                }
 902                /* if nothing to unset, error out */
 903                if (value == NULL) {
 904                        ret = 5;
 905                        goto out_free;
 906                }
 907
 908                store.key = (char*)key;
 909                if (!store_write_section(fd, key) ||
 910                    !store_write_pair(fd, key, value))
 911                        goto write_err_out;
 912        } else {
 913                struct stat st;
 914                char* contents;
 915                size_t contents_sz, copy_begin, copy_end;
 916                int i, new_line = 0;
 917
 918                if (value_regex == NULL)
 919                        store.value_regex = NULL;
 920                else {
 921                        if (value_regex[0] == '!') {
 922                                store.do_not_match = 1;
 923                                value_regex++;
 924                        } else
 925                                store.do_not_match = 0;
 926
 927                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
 928                        if (regcomp(store.value_regex, value_regex,
 929                                        REG_EXTENDED)) {
 930                                fprintf(stderr, "Invalid pattern: %s\n",
 931                                        value_regex);
 932                                free(store.value_regex);
 933                                ret = 6;
 934                                goto out_free;
 935                        }
 936                }
 937
 938                store.offset[0] = 0;
 939                store.state = START;
 940                store.seen = 0;
 941
 942                /*
 943                 * After this, store.offset will contain the *end* offset
 944                 * of the last match, or remain at 0 if no match was found.
 945                 * As a side effect, we make sure to transform only a valid
 946                 * existing config file.
 947                 */
 948                if (git_config_from_file(store_aux, config_filename)) {
 949                        fprintf(stderr, "invalid config file\n");
 950                        free(store.key);
 951                        if (store.value_regex != NULL) {
 952                                regfree(store.value_regex);
 953                                free(store.value_regex);
 954                        }
 955                        ret = 3;
 956                        goto out_free;
 957                }
 958
 959                free(store.key);
 960                if (store.value_regex != NULL) {
 961                        regfree(store.value_regex);
 962                        free(store.value_regex);
 963                }
 964
 965                /* if nothing to unset, or too many matches, error out */
 966                if ((store.seen == 0 && value == NULL) ||
 967                                (store.seen > 1 && multi_replace == 0)) {
 968                        ret = 5;
 969                        goto out_free;
 970                }
 971
 972                fstat(in_fd, &st);
 973                contents_sz = xsize_t(st.st_size);
 974                contents = xmmap(NULL, contents_sz, PROT_READ,
 975                        MAP_PRIVATE, in_fd, 0);
 976                close(in_fd);
 977
 978                if (store.seen == 0)
 979                        store.seen = 1;
 980
 981                for (i = 0, copy_begin = 0; i < store.seen; i++) {
 982                        if (store.offset[i] == 0) {
 983                                store.offset[i] = copy_end = contents_sz;
 984                        } else if (store.state != KEY_SEEN) {
 985                                copy_end = store.offset[i];
 986                        } else
 987                                copy_end = find_beginning_of_line(
 988                                        contents, contents_sz,
 989                                        store.offset[i]-2, &new_line);
 990
 991                        if (copy_end > 0 && contents[copy_end-1] != '\n')
 992                                new_line = 1;
 993
 994                        /* write the first part of the config */
 995                        if (copy_end > copy_begin) {
 996                                if (write_in_full(fd, contents + copy_begin,
 997                                                  copy_end - copy_begin) <
 998                                    copy_end - copy_begin)
 999                                        goto write_err_out;
1000                                if (new_line &&
1001                                    write_in_full(fd, "\n", 1) != 1)
1002                                        goto write_err_out;
1003                        }
1004                        copy_begin = store.offset[i];
1005                }
1006
1007                /* write the pair (value == NULL means unset) */
1008                if (value != NULL) {
1009                        if (store.state == START) {
1010                                if (!store_write_section(fd, key))
1011                                        goto write_err_out;
1012                        }
1013                        if (!store_write_pair(fd, key, value))
1014                                goto write_err_out;
1015                }
1016
1017                /* write the rest of the config */
1018                if (copy_begin < contents_sz)
1019                        if (write_in_full(fd, contents + copy_begin,
1020                                          contents_sz - copy_begin) <
1021                            contents_sz - copy_begin)
1022                                goto write_err_out;
1023
1024                munmap(contents, contents_sz);
1025        }
1026
1027        if (commit_lock_file(lock) < 0) {
1028                fprintf(stderr, "Cannot commit config file!\n");
1029                ret = 4;
1030                goto out_free;
1031        }
1032
1033        /*
1034         * lock is committed, so don't try to roll it back below.
1035         * NOTE: Since lockfile.c keeps a linked list of all created
1036         * lock_file structures, it isn't safe to free(lock).  It's
1037         * better to just leave it hanging around.
1038         */
1039        lock = NULL;
1040        ret = 0;
1041
1042out_free:
1043        if (lock)
1044                rollback_lock_file(lock);
1045        free(config_filename);
1046        return ret;
1047
1048write_err_out:
1049        ret = write_error();
1050        goto out_free;
1051
1052}
1053
1054static int section_name_match (const char *buf, const char *name)
1055{
1056        int i = 0, j = 0, dot = 0;
1057        for (; buf[i] && buf[i] != ']'; i++) {
1058                if (!dot && isspace(buf[i])) {
1059                        dot = 1;
1060                        if (name[j++] != '.')
1061                                break;
1062                        for (i++; isspace(buf[i]); i++)
1063                                ; /* do nothing */
1064                        if (buf[i] != '"')
1065                                break;
1066                        continue;
1067                }
1068                if (buf[i] == '\\' && dot)
1069                        i++;
1070                else if (buf[i] == '"' && dot) {
1071                        for (i++; isspace(buf[i]); i++)
1072                                ; /* do_nothing */
1073                        break;
1074                }
1075                if (buf[i] != name[j++])
1076                        break;
1077        }
1078        return (buf[i] == ']' && name[j] == 0);
1079}
1080
1081/* if new_name == NULL, the section is removed instead */
1082int git_config_rename_section(const char *old_name, const char *new_name)
1083{
1084        int ret = 0, remove = 0;
1085        char *config_filename;
1086        struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1087        int out_fd;
1088        char buf[1024];
1089
1090        config_filename = getenv(CONFIG_ENVIRONMENT);
1091        if (!config_filename) {
1092                config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
1093                if (!config_filename)
1094                        config_filename  = git_path("config");
1095        }
1096        config_filename = xstrdup(config_filename);
1097        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1098        if (out_fd < 0) {
1099                ret = error("Could not lock config file!");
1100                goto out;
1101        }
1102
1103        if (!(config_file = fopen(config_filename, "rb"))) {
1104                /* no config file means nothing to rename, no error */
1105                goto unlock_and_out;
1106        }
1107
1108        while (fgets(buf, sizeof(buf), config_file)) {
1109                int i;
1110                int length;
1111                for (i = 0; buf[i] && isspace(buf[i]); i++)
1112                        ; /* do nothing */
1113                if (buf[i] == '[') {
1114                        /* it's a section */
1115                        if (section_name_match (&buf[i+1], old_name)) {
1116                                ret++;
1117                                if (new_name == NULL) {
1118                                        remove = 1;
1119                                        continue;
1120                                }
1121                                store.baselen = strlen(new_name);
1122                                if (!store_write_section(out_fd, new_name)) {
1123                                        ret = write_error();
1124                                        goto out;
1125                                }
1126                                continue;
1127                        }
1128                        remove = 0;
1129                }
1130                if (remove)
1131                        continue;
1132                length = strlen(buf);
1133                if (write_in_full(out_fd, buf, length) != length) {
1134                        ret = write_error();
1135                        goto out;
1136                }
1137        }
1138        fclose(config_file);
1139 unlock_and_out:
1140        if (commit_lock_file(lock) < 0)
1141                        ret = error("Cannot commit config file!");
1142 out:
1143        free(config_filename);
1144        return ret;
1145}
1146
1147/*
1148 * Call this to report error for your variable that should not
1149 * get a boolean value (i.e. "[my] var" means "true").
1150 */
1151int config_error_nonbool(const char *var)
1152{
1153        return error("Missing value for '%s'", var);
1154}