config.con commit Merge branch 'lt/web' (efced1e)
   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 <regex.h>
  10
  11#define MAXNAME (256)
  12
  13static FILE *config_file;
  14static const char *config_file_name;
  15static int config_linenr;
  16static int get_next_char(void)
  17{
  18        int c;
  19        FILE *f;
  20
  21        c = '\n';
  22        if ((f = config_file) != NULL) {
  23                c = fgetc(f);
  24                if (c == '\r') {
  25                        /* DOS like systems */
  26                        c = fgetc(f);
  27                        if (c != '\n') {
  28                                ungetc(c, f);
  29                                c = '\r';
  30                        }
  31                }
  32                if (c == '\n')
  33                        config_linenr++;
  34                if (c == EOF) {
  35                        config_file = NULL;
  36                        c = '\n';
  37                }
  38        }
  39        return c;
  40}
  41
  42static char *parse_value(void)
  43{
  44        static char value[1024];
  45        int quote = 0, comment = 0, len = 0, space = 0;
  46
  47        for (;;) {
  48                int c = get_next_char();
  49                if (len >= sizeof(value))
  50                        return NULL;
  51                if (c == '\n') {
  52                        if (quote)
  53                                return NULL;
  54                        value[len] = 0;
  55                        return value;
  56                }
  57                if (comment)
  58                        continue;
  59                if (isspace(c) && !quote) {
  60                        space = 1;
  61                        continue;
  62                }
  63                if (!quote) {
  64                        if (c == ';' || c == '#') {
  65                                comment = 1;
  66                                continue;
  67                        }
  68                }
  69                if (space) {
  70                        if (len)
  71                                value[len++] = ' ';
  72                        space = 0;
  73                }
  74                if (c == '\\') {
  75                        c = get_next_char();
  76                        switch (c) {
  77                        case '\n':
  78                                continue;
  79                        case 't':
  80                                c = '\t';
  81                                break;
  82                        case 'b':
  83                                c = '\b';
  84                                break;
  85                        case 'n':
  86                                c = '\n';
  87                                break;
  88                        /* Some characters escape as themselves */
  89                        case '\\': case '"':
  90                                break;
  91                        /* Reject unknown escape sequences */
  92                        default:
  93                                return NULL;
  94                        }
  95                        value[len++] = c;
  96                        continue;
  97                }
  98                if (c == '"') {
  99                        quote = 1-quote;
 100                        continue;
 101                }
 102                value[len++] = c;
 103        }
 104}
 105
 106static int get_value(config_fn_t fn, char *name, unsigned int len)
 107{
 108        int c;
 109        char *value;
 110
 111        /* Get the full name */
 112        for (;;) {
 113                c = get_next_char();
 114                if (c == EOF)
 115                        break;
 116                if (!isalnum(c))
 117                        break;
 118                name[len++] = tolower(c);
 119                if (len >= MAXNAME)
 120                        return -1;
 121        }
 122        name[len] = 0;
 123        while (c == ' ' || c == '\t')
 124                c = get_next_char();
 125
 126        value = NULL;
 127        if (c != '\n') {
 128                if (c != '=')
 129                        return -1;
 130                value = parse_value();
 131                if (!value)
 132                        return -1;
 133        }
 134        return fn(name, value);
 135}
 136
 137static int get_extended_base_var(char *name, int baselen, int c)
 138{
 139        do {
 140                if (c == '\n')
 141                        return -1;
 142                c = get_next_char();
 143        } while (isspace(c));
 144
 145        /* We require the format to be '[base "extension"]' */
 146        if (c != '"')
 147                return -1;
 148        name[baselen++] = '.';
 149
 150        for (;;) {
 151                int c = get_next_char();
 152                if (c == '\n')
 153                        return -1;
 154                if (c == '"')
 155                        break;
 156                if (c == '\\') {
 157                        c = get_next_char();
 158                        if (c == '\n')
 159                                return -1;
 160                }
 161                name[baselen++] = c;
 162                if (baselen > MAXNAME / 2)
 163                        return -1;
 164        }
 165
 166        /* Final ']' */
 167        if (get_next_char() != ']')
 168                return -1;
 169        return baselen;
 170}
 171
 172static int get_base_var(char *name)
 173{
 174        int baselen = 0;
 175
 176        for (;;) {
 177                int c = get_next_char();
 178                if (c == EOF)
 179                        return -1;
 180                if (c == ']')
 181                        return baselen;
 182                if (isspace(c))
 183                        return get_extended_base_var(name, baselen, c);
 184                if (!isalnum(c) && c != '.')
 185                        return -1;
 186                if (baselen > MAXNAME / 2)
 187                        return -1;
 188                name[baselen++] = tolower(c);
 189        }
 190}
 191
 192static int git_parse_file(config_fn_t fn)
 193{
 194        int comment = 0;
 195        int baselen = 0;
 196        static char var[MAXNAME];
 197
 198        for (;;) {
 199                int c = get_next_char();
 200                if (c == '\n') {
 201                        /* EOF? */
 202                        if (!config_file)
 203                                return 0;
 204                        comment = 0;
 205                        continue;
 206                }
 207                if (comment || isspace(c))
 208                        continue;
 209                if (c == '#' || c == ';') {
 210                        comment = 1;
 211                        continue;
 212                }
 213                if (c == '[') {
 214                        baselen = get_base_var(var);
 215                        if (baselen <= 0)
 216                                break;
 217                        var[baselen++] = '.';
 218                        var[baselen] = 0;
 219                        continue;
 220                }
 221                if (!isalpha(c))
 222                        break;
 223                var[baselen] = tolower(c);
 224                if (get_value(fn, var, baselen+1) < 0)
 225                        break;
 226        }
 227        die("bad config file line %d in %s", config_linenr, config_file_name);
 228}
 229
 230int git_config_int(const char *name, const char *value)
 231{
 232        if (value && *value) {
 233                char *end;
 234                int val = strtol(value, &end, 0);
 235                if (!*end)
 236                        return val;
 237        }
 238        die("bad config value for '%s' in %s", name, config_file_name);
 239}
 240
 241int git_config_bool(const char *name, const char *value)
 242{
 243        if (!value)
 244                return 1;
 245        if (!*value)
 246                return 0;
 247        if (!strcasecmp(value, "true") || !strcasecmp(value, "yes"))
 248                return 1;
 249        if (!strcasecmp(value, "false") || !strcasecmp(value, "no"))
 250                return 0;
 251        return git_config_int(name, value) != 0;
 252}
 253
 254int git_default_config(const char *var, const char *value)
 255{
 256        /* This needs a better name */
 257        if (!strcmp(var, "core.filemode")) {
 258                trust_executable_bit = git_config_bool(var, value);
 259                return 0;
 260        }
 261
 262        if (!strcmp(var, "core.ignorestat")) {
 263                assume_unchanged = git_config_bool(var, value);
 264                return 0;
 265        }
 266
 267        if (!strcmp(var, "core.prefersymlinkrefs")) {
 268                prefer_symlink_refs = git_config_bool(var, value);
 269                return 0;
 270        }
 271
 272        if (!strcmp(var, "core.logallrefupdates")) {
 273                log_all_ref_updates = git_config_bool(var, value);
 274                return 0;
 275        }
 276
 277        if (!strcmp(var, "core.warnambiguousrefs")) {
 278                warn_ambiguous_refs = git_config_bool(var, value);
 279                return 0;
 280        }
 281
 282        if (!strcmp(var, "core.legacyheaders")) {
 283                use_legacy_headers = git_config_bool(var, value);
 284                return 0;
 285        }
 286
 287        if (!strcmp(var, "core.compression")) {
 288                int level = git_config_int(var, value);
 289                if (level == -1)
 290                        level = Z_DEFAULT_COMPRESSION;
 291                else if (level < 0 || level > Z_BEST_COMPRESSION)
 292                        die("bad zlib compression level %d", level);
 293                zlib_compression_level = level;
 294                return 0;
 295        }
 296
 297        if (!strcmp(var, "user.name")) {
 298                strlcpy(git_default_name, value, sizeof(git_default_name));
 299                return 0;
 300        }
 301
 302        if (!strcmp(var, "user.email")) {
 303                strlcpy(git_default_email, value, sizeof(git_default_email));
 304                return 0;
 305        }
 306
 307        if (!strcmp(var, "i18n.commitencoding")) {
 308                strlcpy(git_commit_encoding, value, sizeof(git_commit_encoding));
 309                return 0;
 310        }
 311
 312        if (!strcmp(var, "pager.color")) {
 313                pager_use_color = git_config_bool(var,value);
 314                return 0;
 315        }
 316
 317        /* Add other config variables here and to Documentation/config.txt. */
 318        return 0;
 319}
 320
 321int git_config_from_file(config_fn_t fn, const char *filename)
 322{
 323        int ret;
 324        FILE *f = fopen(filename, "r");
 325
 326        ret = -1;
 327        if (f) {
 328                config_file = f;
 329                config_file_name = filename;
 330                config_linenr = 1;
 331                ret = git_parse_file(fn);
 332                fclose(f);
 333                config_file_name = NULL;
 334        }
 335        return ret;
 336}
 337
 338int git_config(config_fn_t fn)
 339{
 340        int ret = 0;
 341        char *repo_config = NULL;
 342        const char *home = NULL, *filename;
 343
 344        /* $GIT_CONFIG makes git read _only_ the given config file,
 345         * $GIT_CONFIG_LOCAL will make it process it in addition to the
 346         * global config file, the same way it would the per-repository
 347         * config file otherwise. */
 348        filename = getenv("GIT_CONFIG");
 349        if (!filename) {
 350                home = getenv("HOME");
 351                filename = getenv("GIT_CONFIG_LOCAL");
 352                if (!filename)
 353                        filename = repo_config = strdup(git_path("config"));
 354        }
 355
 356        if (home) {
 357                char *user_config = strdup(mkpath("%s/.gitconfig", home));
 358                if (!access(user_config, R_OK))
 359                        ret = git_config_from_file(fn, user_config);
 360                free(user_config);
 361        }
 362
 363        ret += git_config_from_file(fn, filename);
 364        if (repo_config)
 365                free(repo_config);
 366        return ret;
 367}
 368
 369/*
 370 * Find all the stuff for git_config_set() below.
 371 */
 372
 373#define MAX_MATCHES 512
 374
 375static struct {
 376        int baselen;
 377        char* key;
 378        int do_not_match;
 379        regex_t* value_regex;
 380        int multi_replace;
 381        off_t offset[MAX_MATCHES];
 382        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
 383        int seen;
 384} store;
 385
 386static int matches(const char* key, const char* value)
 387{
 388        return !strcmp(key, store.key) &&
 389                (store.value_regex == NULL ||
 390                 (store.do_not_match ^
 391                  !regexec(store.value_regex, value, 0, NULL, 0)));
 392}
 393
 394static int store_aux(const char* key, const char* value)
 395{
 396        switch (store.state) {
 397        case KEY_SEEN:
 398                if (matches(key, value)) {
 399                        if (store.seen == 1 && store.multi_replace == 0) {
 400                                fprintf(stderr,
 401                                        "Warning: %s has multiple values\n",
 402                                        key);
 403                        } else if (store.seen >= MAX_MATCHES) {
 404                                fprintf(stderr, "Too many matches\n");
 405                                return 1;
 406                        }
 407
 408                        store.offset[store.seen] = ftell(config_file);
 409                        store.seen++;
 410                }
 411                break;
 412        case SECTION_SEEN:
 413                if (strncmp(key, store.key, store.baselen+1)) {
 414                        store.state = SECTION_END_SEEN;
 415                        break;
 416                } else
 417                        /* do not increment matches: this is no match */
 418                        store.offset[store.seen] = ftell(config_file);
 419                /* fallthru */
 420        case SECTION_END_SEEN:
 421        case START:
 422                if (matches(key, value)) {
 423                        store.offset[store.seen] = ftell(config_file);
 424                        store.state = KEY_SEEN;
 425                        store.seen++;
 426                } else {
 427                        if (strrchr(key, '.') - key == store.baselen &&
 428                              !strncmp(key, store.key, store.baselen)) {
 429                                        store.state = SECTION_SEEN;
 430                                        store.offset[store.seen] = ftell(config_file);
 431                        }
 432                }
 433        }
 434        return 0;
 435}
 436
 437static void store_write_section(int fd, const char* key)
 438{
 439        const char *dot = strchr(key, '.');
 440        int len1 = store.baselen, len2 = -1;
 441
 442        dot = strchr(key, '.');
 443        if (dot) {
 444                int dotlen = dot - key;
 445                if (dotlen < len1) {
 446                        len2 = len1 - dotlen - 1;
 447                        len1 = dotlen;
 448                }
 449        }
 450
 451        write(fd, "[", 1);
 452        write(fd, key, len1);
 453        if (len2 >= 0) {
 454                write(fd, " \"", 2);
 455                while (--len2 >= 0) {
 456                        unsigned char c = *++dot;
 457                        if (c == '"')
 458                                write(fd, "\\", 1);
 459                        write(fd, &c, 1);
 460                }
 461                write(fd, "\"", 1);
 462        }
 463        write(fd, "]\n", 2);
 464}
 465
 466static void store_write_pair(int fd, const char* key, const char* value)
 467{
 468        int i;
 469
 470        write(fd, "\t", 1);
 471        write(fd, key+store.baselen+1,
 472                strlen(key+store.baselen+1));
 473        write(fd, " = ", 3);
 474        for (i = 0; value[i]; i++)
 475                switch (value[i]) {
 476                case '\n': write(fd, "\\n", 2); break;
 477                case '\t': write(fd, "\\t", 2); break;
 478                case '"': case '\\': write(fd, "\\", 1);
 479                default: write(fd, value+i, 1);
 480        }
 481        write(fd, "\n", 1);
 482}
 483
 484static int find_beginning_of_line(const char* contents, int size,
 485        int offset_, int* found_bracket)
 486{
 487        int equal_offset = size, bracket_offset = size;
 488        int offset;
 489
 490        for (offset = offset_-2; offset > 0 
 491                        && contents[offset] != '\n'; offset--)
 492                switch (contents[offset]) {
 493                        case '=': equal_offset = offset; break;
 494                        case ']': bracket_offset = offset; break;
 495                }
 496        if (bracket_offset < equal_offset) {
 497                *found_bracket = 1;
 498                offset = bracket_offset+1;
 499        } else
 500                offset++;
 501
 502        return offset;
 503}
 504
 505int git_config_set(const char* key, const char* value)
 506{
 507        return git_config_set_multivar(key, value, NULL, 0);
 508}
 509
 510/*
 511 * If value==NULL, unset in (remove from) config,
 512 * if value_regex!=NULL, disregard key/value pairs where value does not match.
 513 * if multi_replace==0, nothing, or only one matching key/value is replaced,
 514 *     else all matching key/values (regardless how many) are removed,
 515 *     before the new pair is written.
 516 *
 517 * Returns 0 on success.
 518 *
 519 * This function does this:
 520 *
 521 * - it locks the config file by creating ".git/config.lock"
 522 *
 523 * - it then parses the config using store_aux() as validator to find
 524 *   the position on the key/value pair to replace. If it is to be unset,
 525 *   it must be found exactly once.
 526 *
 527 * - the config file is mmap()ed and the part before the match (if any) is
 528 *   written to the lock file, then the changed part and the rest.
 529 *
 530 * - the config file is removed and the lock file rename()d to it.
 531 *
 532 */
 533int git_config_set_multivar(const char* key, const char* value,
 534        const char* value_regex, int multi_replace)
 535{
 536        int i, dot;
 537        int fd = -1, in_fd;
 538        int ret;
 539        char* config_filename;
 540        char* lock_file;
 541        const char* last_dot = strrchr(key, '.');
 542
 543        config_filename = getenv("GIT_CONFIG");
 544        if (!config_filename) {
 545                config_filename = getenv("GIT_CONFIG_LOCAL");
 546                if (!config_filename)
 547                        config_filename  = git_path("config");
 548        }
 549        config_filename = strdup(config_filename);
 550        lock_file = strdup(mkpath("%s.lock", config_filename));
 551
 552        /*
 553         * Since "key" actually contains the section name and the real
 554         * key name separated by a dot, we have to know where the dot is.
 555         */
 556
 557        if (last_dot == NULL) {
 558                fprintf(stderr, "key does not contain a section: %s\n", key);
 559                ret = 2;
 560                goto out_free;
 561        }
 562        store.baselen = last_dot - key;
 563
 564        store.multi_replace = multi_replace;
 565
 566        /*
 567         * Validate the key and while at it, lower case it for matching.
 568         */
 569        store.key = (char*)malloc(strlen(key)+1);
 570        dot = 0;
 571        for (i = 0; key[i]; i++) {
 572                unsigned char c = key[i];
 573                if (c == '.')
 574                        dot = 1;
 575                /* Leave the extended basename untouched.. */
 576                if (!dot || i > store.baselen) {
 577                        if (!isalnum(c) || (i == store.baselen+1 && !isalpha(c))) {
 578                                fprintf(stderr, "invalid key: %s\n", key);
 579                                free(store.key);
 580                                ret = 1;
 581                                goto out_free;
 582                        }
 583                        c = tolower(c);
 584                }
 585                store.key[i] = c;
 586        }
 587        store.key[i] = 0;
 588
 589        /*
 590         * The lock_file serves a purpose in addition to locking: the new
 591         * contents of .git/config will be written into it.
 592         */
 593        fd = open(lock_file, O_WRONLY | O_CREAT | O_EXCL, 0666);
 594        if (fd < 0 || adjust_shared_perm(lock_file)) {
 595                fprintf(stderr, "could not lock config file\n");
 596                free(store.key);
 597                ret = -1;
 598                goto out_free;
 599        }
 600
 601        /*
 602         * If .git/config does not exist yet, write a minimal version.
 603         */
 604        in_fd = open(config_filename, O_RDONLY);
 605        if ( in_fd < 0 ) {
 606                free(store.key);
 607
 608                if ( ENOENT != errno ) {
 609                        error("opening %s: %s", config_filename,
 610                              strerror(errno));
 611                        ret = 3; /* same as "invalid config file" */
 612                        goto out_free;
 613                }
 614                /* if nothing to unset, error out */
 615                if (value == NULL) {
 616                        ret = 5;
 617                        goto out_free;
 618                }
 619
 620                store.key = (char*)key;
 621                store_write_section(fd, key);
 622                store_write_pair(fd, key, value);
 623        } else{
 624                struct stat st;
 625                char* contents;
 626                int i, copy_begin, copy_end, new_line = 0;
 627
 628                if (value_regex == NULL)
 629                        store.value_regex = NULL;
 630                else {
 631                        if (value_regex[0] == '!') {
 632                                store.do_not_match = 1;
 633                                value_regex++;
 634                        } else
 635                                store.do_not_match = 0;
 636
 637                        store.value_regex = (regex_t*)malloc(sizeof(regex_t));
 638                        if (regcomp(store.value_regex, value_regex,
 639                                        REG_EXTENDED)) {
 640                                fprintf(stderr, "Invalid pattern: %s\n",
 641                                        value_regex);
 642                                free(store.value_regex);
 643                                ret = 6;
 644                                goto out_free;
 645                        }
 646                }
 647
 648                store.offset[0] = 0;
 649                store.state = START;
 650                store.seen = 0;
 651
 652                /*
 653                 * After this, store.offset will contain the *end* offset
 654                 * of the last match, or remain at 0 if no match was found.
 655                 * As a side effect, we make sure to transform only a valid
 656                 * existing config file.
 657                 */
 658                if (git_config_from_file(store_aux, config_filename)) {
 659                        fprintf(stderr, "invalid config file\n");
 660                        free(store.key);
 661                        if (store.value_regex != NULL) {
 662                                regfree(store.value_regex);
 663                                free(store.value_regex);
 664                        }
 665                        ret = 3;
 666                        goto out_free;
 667                }
 668
 669                free(store.key);
 670                if (store.value_regex != NULL) {
 671                        regfree(store.value_regex);
 672                        free(store.value_regex);
 673                }
 674
 675                /* if nothing to unset, or too many matches, error out */
 676                if ((store.seen == 0 && value == NULL) ||
 677                                (store.seen > 1 && multi_replace == 0)) {
 678                        ret = 5;
 679                        goto out_free;
 680                }
 681
 682                fstat(in_fd, &st);
 683                contents = mmap(NULL, st.st_size, PROT_READ,
 684                        MAP_PRIVATE, in_fd, 0);
 685                close(in_fd);
 686
 687                if (store.seen == 0)
 688                        store.seen = 1;
 689
 690                for (i = 0, copy_begin = 0; i < store.seen; i++) {
 691                        if (store.offset[i] == 0) {
 692                                store.offset[i] = copy_end = st.st_size;
 693                        } else if (store.state != KEY_SEEN) {
 694                                copy_end = store.offset[i];
 695                        } else
 696                                copy_end = find_beginning_of_line(
 697                                        contents, st.st_size,
 698                                        store.offset[i]-2, &new_line);
 699
 700                        /* write the first part of the config */
 701                        if (copy_end > copy_begin) {
 702                                write(fd, contents + copy_begin,
 703                                copy_end - copy_begin);
 704                                if (new_line)
 705                                        write(fd, "\n", 1);
 706                        }
 707                        copy_begin = store.offset[i];
 708                }
 709
 710                /* write the pair (value == NULL means unset) */
 711                if (value != NULL) {
 712                        if (store.state == START)
 713                                store_write_section(fd, key);
 714                        store_write_pair(fd, key, value);
 715                }
 716
 717                /* write the rest of the config */
 718                if (copy_begin < st.st_size)
 719                        write(fd, contents + copy_begin,
 720                                st.st_size - copy_begin);
 721
 722                munmap(contents, st.st_size);
 723                unlink(config_filename);
 724        }
 725
 726        if (rename(lock_file, config_filename) < 0) {
 727                fprintf(stderr, "Could not rename the lock file?\n");
 728                ret = 4;
 729                goto out_free;
 730        }
 731
 732        ret = 0;
 733
 734out_free:
 735        if (0 <= fd)
 736                close(fd);
 737        if (config_filename)
 738                free(config_filename);
 739        if (lock_file) {
 740                unlink(lock_file);
 741                free(lock_file);
 742        }
 743        return ret;
 744}
 745
 746