Andrew's git / gitweb.git / config.c
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config.con commit core.whitespace: add test for diff whitespace error highlighting (49e703a)
   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
  10#define MAXNAME (256)
  11
  12static FILE *config_file;
  13static const char *config_file_name;
  14static int config_linenr;
  15static int zlib_compression_seen;
  16
  17static int get_next_char(void)
  18{
  19        int c;
  20        FILE *f;
  21
  22        c = '\n';
  23        if ((f = config_file) != NULL) {
  24                c = fgetc(f);
  25                if (c == '\r') {
  26                        /* DOS like systems */
  27                        c = fgetc(f);
  28                        if (c != '\n') {
  29                                ungetc(c, f);
  30                                c = '\r';
  31                        }
  32                }
  33                if (c == '\n')
  34                        config_linenr++;
  35                if (c == EOF) {
  36                        config_file = NULL;
  37                        c = '\n';
  38                }
  39        }
  40        return c;
  41}
  42
  43static char *parse_value(void)
  44{
  45        static char value[1024];
  46        int quote = 0, comment = 0, len = 0, space = 0;
  47
  48        for (;;) {
  49                int c = get_next_char();
  50                if (len >= sizeof(value))
  51                        return NULL;
  52                if (c == '\n') {
  53                        if (quote)
  54                                return NULL;
  55                        value[len] = 0;
  56                        return value;
  57                }
  58                if (comment)
  59                        continue;
  60                if (isspace(c) && !quote) {
  61                        space = 1;
  62                        continue;
  63                }
  64                if (!quote) {
  65                        if (c == ';' || c == '#') {
  66                                comment = 1;
  67                                continue;
  68                        }
  69                }
  70                if (space) {
  71                        if (len)
  72                                value[len++] = ' ';
  73                        space = 0;
  74                }
  75                if (c == '\\') {
  76                        c = get_next_char();
  77                        switch (c) {
  78                        case '\n':
  79                                continue;
  80                        case 't':
  81                                c = '\t';
  82                                break;
  83                        case 'b':
  84                                c = '\b';
  85                                break;
  86                        case 'n':
  87                                c = '\n';
  88                                break;
  89                        /* Some characters escape as themselves */
  90                        case '\\': case '"':
  91                                break;
  92                        /* Reject unknown escape sequences */
  93                        default:
  94                                return NULL;
  95                        }
  96                        value[len++] = c;
  97                        continue;
  98                }
  99                if (c == '"') {
 100                        quote = 1-quote;
 101                        continue;
 102                }
 103                value[len++] = c;
 104        }
 105}
 106
 107static inline int iskeychar(int c)
 108{
 109        return isalnum(c) || c == '-';
 110}
 111
 112static int get_value(config_fn_t fn, char *name, unsigned int len)
 113{
 114        int c;
 115        char *value;
 116
 117        /* Get the full name */
 118        for (;;) {
 119                c = get_next_char();
 120                if (c == EOF)
 121                        break;
 122                if (!iskeychar(c))
 123                        break;
 124                name[len++] = tolower(c);
 125                if (len >= MAXNAME)
 126                        return -1;
 127        }
 128        name[len] = 0;
 129        while (c == ' ' || c == '\t')
 130                c = get_next_char();
 131
 132        value = NULL;
 133        if (c != '\n') {
 134                if (c != '=')
 135                        return -1;
 136                value = parse_value();
 137                if (!value)
 138                        return -1;
 139        }
 140        return fn(name, value);
 141}
 142
 143static int get_extended_base_var(char *name, int baselen, int c)
 144{
 145        do {
 146                if (c == '\n')
 147                        return -1;
 148                c = get_next_char();
 149        } while (isspace(c));
 150
 151        /* We require the format to be '[base "extension"]' */
 152        if (c != '"')
 153                return -1;
 154        name[baselen++] = '.';
 155
 156        for (;;) {
 157                int c = get_next_char();
 158                if (c == '\n')
 159                        return -1;
 160                if (c == '"')
 161                        break;
 162                if (c == '\\') {
 163                        c = get_next_char();
 164                        if (c == '\n')
 165                                return -1;
 166                }
 167                name[baselen++] = c;
 168                if (baselen > MAXNAME / 2)
 169                        return -1;
 170        }
 171
 172        /* Final ']' */
 173        if (get_next_char() != ']')
 174                return -1;
 175        return baselen;
 176}
 177
 178static int get_base_var(char *name)
 179{
 180        int baselen = 0;
 181
 182        for (;;) {
 183                int c = get_next_char();
 184                if (c == EOF)
 185                        return -1;
 186                if (c == ']')
 187                        return baselen;
 188                if (isspace(c))
 189                        return get_extended_base_var(name, baselen, c);
 190                if (!iskeychar(c) && c != '.')
 191                        return -1;
 192                if (baselen > MAXNAME / 2)
 193                        return -1;
 194                name[baselen++] = tolower(c);
 195        }
 196}
 197
 198static int git_parse_file(config_fn_t fn)
 199{
 200        int comment = 0;
 201        int baselen = 0;
 202        static char var[MAXNAME];
 203
 204        for (;;) {
 205                int c = get_next_char();
 206                if (c == '\n') {
 207                        /* EOF? */
 208                        if (!config_file)
 209                                return 0;
 210                        comment = 0;
 211                        continue;
 212                }
 213                if (comment || isspace(c))
 214                        continue;
 215                if (c == '#' || c == ';') {
 216                        comment = 1;
 217                        continue;
 218                }
 219                if (c == '[') {
 220                        baselen = get_base_var(var);
 221                        if (baselen <= 0)
 222                                break;
 223                        var[baselen++] = '.';
 224                        var[baselen] = 0;
 225                        continue;
 226                }
 227                if (!isalpha(c))
 228                        break;
 229                var[baselen] = tolower(c);
 230                if (get_value(fn, var, baselen+1) < 0)
 231                        break;
 232        }
 233        die("bad config file line %d in %s", config_linenr, config_file_name);
 234}
 235
 236static unsigned long get_unit_factor(const char *end)
 237{
 238        if (!*end)
 239                return 1;
 240        else if (!strcasecmp(end, "k"))
 241                return 1024;
 242        else if (!strcasecmp(end, "m"))
 243                return 1024 * 1024;
 244        else if (!strcasecmp(end, "g"))
 245                return 1024 * 1024 * 1024;
 246        die("unknown unit: '%s'", end);
 247}
 248
 249static struct whitespace_rule {
 250        const char *rule_name;
 251        unsigned rule_bits;
 252} whitespace_rule_names[] = {
 253        { "trailing-space", WS_TRAILING_SPACE },
 254        { "space-before-tab", WS_SPACE_BEFORE_TAB },
 255        { "indent-with-non-tab", WS_INDENT_WITH_NON_TAB },
 256};
 257
 258static unsigned parse_whitespace_rule(const char *string)
 259{
 260        unsigned rule = WS_DEFAULT_RULE;
 261
 262        while (string) {
 263                int i;
 264                size_t len;
 265                const char *ep;
 266                int negated = 0;
 267
 268                string = string + strspn(string, ", \t\n\r");
 269                ep = strchr(string, ',');
 270                if (!ep)
 271                        len = strlen(string);
 272                else
 273                        len = ep - string;
 274
 275                if (*string == '-') {
 276                        negated = 1;
 277                        string++;
 278                        len--;
 279                }
 280                if (!len)
 281                        break;
 282                for (i = 0; i < ARRAY_SIZE(whitespace_rule_names); i++) {
 283                        if (strncmp(whitespace_rule_names[i].rule_name,
 284                                    string, len))
 285                                continue;
 286                        if (negated)
 287                                rule &= ~whitespace_rule_names[i].rule_bits;
 288                        else
 289                                rule |= whitespace_rule_names[i].rule_bits;
 290                        break;
 291                }
 292                string = ep;
 293        }
 294        return rule;
 295}
 296
 297int git_parse_long(const char *value, long *ret)
 298{
 299        if (value && *value) {
 300                char *end;
 301                long val = strtol(value, &end, 0);
 302                *ret = val * get_unit_factor(end);
 303                return 1;
 304        }
 305        return 0;
 306}
 307
 308int git_parse_ulong(const char *value, unsigned long *ret)
 309{
 310        if (value && *value) {
 311                char *end;
 312                unsigned long val = strtoul(value, &end, 0);
 313                *ret = val * get_unit_factor(end);
 314                return 1;
 315        }
 316        return 0;
 317}
 318
 319int git_config_int(const char *name, const char *value)
 320{
 321        long ret;
 322        if (!git_parse_long(value, &ret))
 323                die("bad config value for '%s' in %s", name, config_file_name);
 324        return ret;
 325}
 326
 327unsigned long git_config_ulong(const char *name, const char *value)
 328{
 329        unsigned long ret;
 330        if (!git_parse_ulong(value, &ret))
 331                die("bad config value for '%s' in %s", name, config_file_name);
 332        return ret;
 333}
 334
 335int git_config_bool(const char *name, const char *value)
 336{
 337        if (!value)
 338                return 1;
 339        if (!*value)
 340                return 0;
 341        if (!strcasecmp(value, "true") || !strcasecmp(value, "yes"))
 342                return 1;
 343        if (!strcasecmp(value, "false") || !strcasecmp(value, "no"))
 344                return 0;
 345        return git_config_int(name, value) != 0;
 346}
 347
 348int git_default_config(const char *var, const char *value)
 349{
 350        /* This needs a better name */
 351        if (!strcmp(var, "core.filemode")) {
 352                trust_executable_bit = git_config_bool(var, value);
 353                return 0;
 354        }
 355
 356        if (!strcmp(var, "core.quotepath")) {
 357                quote_path_fully = git_config_bool(var, value);
 358                return 0;
 359        }
 360
 361        if (!strcmp(var, "core.symlinks")) {
 362                has_symlinks = git_config_bool(var, value);
 363                return 0;
 364        }
 365
 366        if (!strcmp(var, "core.bare")) {
 367                is_bare_repository_cfg = git_config_bool(var, value);
 368                return 0;
 369        }
 370
 371        if (!strcmp(var, "core.ignorestat")) {
 372                assume_unchanged = git_config_bool(var, value);
 373                return 0;
 374        }
 375
 376        if (!strcmp(var, "core.prefersymlinkrefs")) {
 377                prefer_symlink_refs = git_config_bool(var, value);
 378                return 0;
 379        }
 380
 381        if (!strcmp(var, "core.logallrefupdates")) {
 382                log_all_ref_updates = git_config_bool(var, value);
 383                return 0;
 384        }
 385
 386        if (!strcmp(var, "core.warnambiguousrefs")) {
 387                warn_ambiguous_refs = git_config_bool(var, value);
 388                return 0;
 389        }
 390
 391        if (!strcmp(var, "core.loosecompression")) {
 392                int level = git_config_int(var, value);
 393                if (level == -1)
 394                        level = Z_DEFAULT_COMPRESSION;
 395                else if (level < 0 || level > Z_BEST_COMPRESSION)
 396                        die("bad zlib compression level %d", level);
 397                zlib_compression_level = level;
 398                zlib_compression_seen = 1;
 399                return 0;
 400        }
 401
 402        if (!strcmp(var, "core.compression")) {
 403                int level = git_config_int(var, value);
 404                if (level == -1)
 405                        level = Z_DEFAULT_COMPRESSION;
 406                else if (level < 0 || level > Z_BEST_COMPRESSION)
 407                        die("bad zlib compression level %d", level);
 408                core_compression_level = level;
 409                core_compression_seen = 1;
 410                if (!zlib_compression_seen)
 411                        zlib_compression_level = level;
 412                return 0;
 413        }
 414
 415        if (!strcmp(var, "core.packedgitwindowsize")) {
 416                int pgsz_x2 = getpagesize() * 2;
 417                packed_git_window_size = git_config_int(var, value);
 418
 419                /* This value must be multiple of (pagesize * 2) */
 420                packed_git_window_size /= pgsz_x2;
 421                if (packed_git_window_size < 1)
 422                        packed_git_window_size = 1;
 423                packed_git_window_size *= pgsz_x2;
 424                return 0;
 425        }
 426
 427        if (!strcmp(var, "core.packedgitlimit")) {
 428                packed_git_limit = git_config_int(var, value);
 429                return 0;
 430        }
 431
 432        if (!strcmp(var, "core.deltabasecachelimit")) {
 433                delta_base_cache_limit = git_config_int(var, value);
 434                return 0;
 435        }
 436
 437        if (!strcmp(var, "core.autocrlf")) {
 438                if (value && !strcasecmp(value, "input")) {
 439                        auto_crlf = -1;
 440                        return 0;
 441                }
 442                auto_crlf = git_config_bool(var, value);
 443                return 0;
 444        }
 445
 446        if (!strcmp(var, "user.name")) {
 447                strlcpy(git_default_name, value, sizeof(git_default_name));
 448                return 0;
 449        }
 450
 451        if (!strcmp(var, "user.email")) {
 452                strlcpy(git_default_email, value, sizeof(git_default_email));
 453                return 0;
 454        }
 455
 456        if (!strcmp(var, "i18n.commitencoding")) {
 457                git_commit_encoding = xstrdup(value);
 458                return 0;
 459        }
 460
 461        if (!strcmp(var, "i18n.logoutputencoding")) {
 462                git_log_output_encoding = xstrdup(value);
 463                return 0;
 464        }
 465
 466
 467        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 468                pager_use_color = git_config_bool(var,value);
 469                return 0;
 470        }
 471
 472        if (!strcmp(var, "core.pager")) {
 473                pager_program = xstrdup(value);
 474                return 0;
 475        }
 476
 477        if (!strcmp(var, "core.editor")) {
 478                editor_program = xstrdup(value);
 479                return 0;
 480        }
 481
 482        if (!strcmp(var, "core.whitespace")) {
 483                whitespace_rule = parse_whitespace_rule(value);
 484                return 0;
 485        }
 486
 487        /* Add other config variables here and to Documentation/config.txt. */
 488        return 0;
 489}
 490
 491int git_config_from_file(config_fn_t fn, const char *filename)
 492{
 493        int ret;
 494        FILE *f = fopen(filename, "r");
 495
 496        ret = -1;
 497        if (f) {
 498                config_file = f;
 499                config_file_name = filename;
 500                config_linenr = 1;
 501                ret = git_parse_file(fn);
 502                fclose(f);
 503                config_file_name = NULL;
 504        }
 505        return ret;
 506}
 507
 508int git_config(config_fn_t fn)
 509{
 510        int ret = 0;
 511        char *repo_config = NULL;
 512        const char *home = NULL, *filename;
 513
 514        /* $GIT_CONFIG makes git read _only_ the given config file,
 515         * $GIT_CONFIG_LOCAL will make it process it in addition to the
 516         * global config file, the same way it would the per-repository
 517         * config file otherwise. */
 518        filename = getenv(CONFIG_ENVIRONMENT);
 519        if (!filename) {
 520                if (!access(ETC_GITCONFIG, R_OK))
 521                        ret += git_config_from_file(fn, ETC_GITCONFIG);
 522                home = getenv("HOME");
 523                filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
 524                if (!filename)
 525                        filename = repo_config = xstrdup(git_path("config"));
 526        }
 527
 528        if (home) {
 529                char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
 530                if (!access(user_config, R_OK))
 531                        ret = git_config_from_file(fn, user_config);
 532                free(user_config);
 533        }
 534
 535        ret += git_config_from_file(fn, filename);
 536        free(repo_config);
 537        return ret;
 538}
 539
 540/*
 541 * Find all the stuff for git_config_set() below.
 542 */
 543
 544#define MAX_MATCHES 512
 545
 546static struct {
 547        int baselen;
 548        char* key;
 549        int do_not_match;
 550        regex_t* value_regex;
 551        int multi_replace;
 552        size_t offset[MAX_MATCHES];
 553        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
 554        int seen;
 555} store;
 556
 557static int matches(const char* key, const char* value)
 558{
 559        return !strcmp(key, store.key) &&
 560                (store.value_regex == NULL ||
 561                 (store.do_not_match ^
 562                  !regexec(store.value_regex, value, 0, NULL, 0)));
 563}
 564
 565static int store_aux(const char* key, const char* value)
 566{
 567        const char *ep;
 568        size_t section_len;
 569
 570        switch (store.state) {
 571        case KEY_SEEN:
 572                if (matches(key, value)) {
 573                        if (store.seen == 1 && store.multi_replace == 0) {
 574                                fprintf(stderr,
 575                                        "Warning: %s has multiple values\n",
 576                                        key);
 577                        } else if (store.seen >= MAX_MATCHES) {
 578                                fprintf(stderr, "Too many matches\n");
 579                                return 1;
 580                        }
 581
 582                        store.offset[store.seen] = ftell(config_file);
 583                        store.seen++;
 584                }
 585                break;
 586        case SECTION_SEEN:
 587                /*
 588                 * What we are looking for is in store.key (both
 589                 * section and var), and its section part is baselen
 590                 * long.  We found key (again, both section and var).
 591                 * We would want to know if this key is in the same
 592                 * section as what we are looking for.  We already
 593                 * know we are in the same section as what should
 594                 * hold store.key.
 595                 */
 596                ep = strrchr(key, '.');
 597                section_len = ep - key;
 598
 599                if ((section_len != store.baselen) ||
 600                    memcmp(key, store.key, section_len+1)) {
 601                        store.state = SECTION_END_SEEN;
 602                        break;
 603                }
 604
 605                /*
 606                 * Do not increment matches: this is no match, but we
 607                 * just made sure we are in the desired section.
 608                 */
 609                store.offset[store.seen] = ftell(config_file);
 610                /* fallthru */
 611        case SECTION_END_SEEN:
 612        case START:
 613                if (matches(key, value)) {
 614                        store.offset[store.seen] = ftell(config_file);
 615                        store.state = KEY_SEEN;
 616                        store.seen++;
 617                } else {
 618                        if (strrchr(key, '.') - key == store.baselen &&
 619                              !strncmp(key, store.key, store.baselen)) {
 620                                        store.state = SECTION_SEEN;
 621                                        store.offset[store.seen] = ftell(config_file);
 622                        }
 623                }
 624        }
 625        return 0;
 626}
 627
 628static int write_error(void)
 629{
 630        fprintf(stderr, "Failed to write new configuration file\n");
 631
 632        /* Same error code as "failed to rename". */
 633        return 4;
 634}
 635
 636static int store_write_section(int fd, const char* key)
 637{
 638        const char *dot = strchr(key, '.');
 639        int len1 = store.baselen, len2 = -1;
 640
 641        dot = strchr(key, '.');
 642        if (dot) {
 643                int dotlen = dot - key;
 644                if (dotlen < len1) {
 645                        len2 = len1 - dotlen - 1;
 646                        len1 = dotlen;
 647                }
 648        }
 649
 650        if (write_in_full(fd, "[", 1) != 1 ||
 651            write_in_full(fd, key, len1) != len1)
 652                return 0;
 653        if (len2 >= 0) {
 654                if (write_in_full(fd, " \"", 2) != 2)
 655                        return 0;
 656                while (--len2 >= 0) {
 657                        unsigned char c = *++dot;
 658                        if (c == '"')
 659                                if (write_in_full(fd, "\\", 1) != 1)
 660                                        return 0;
 661                        if (write_in_full(fd, &c, 1) != 1)
 662                                return 0;
 663                }
 664                if (write_in_full(fd, "\"", 1) != 1)
 665                        return 0;
 666        }
 667        if (write_in_full(fd, "]\n", 2) != 2)
 668                return 0;
 669
 670        return 1;
 671}
 672
 673static int store_write_pair(int fd, const char* key, const char* value)
 674{
 675        int i;
 676        int length = strlen(key+store.baselen+1);
 677        int quote = 0;
 678
 679        /* Check to see if the value needs to be quoted. */
 680        if (value[0] == ' ')
 681                quote = 1;
 682        for (i = 0; value[i]; i++)
 683                if (value[i] == ';' || value[i] == '#')
 684                        quote = 1;
 685        if (value[i-1] == ' ')
 686                quote = 1;
 687
 688        if (write_in_full(fd, "\t", 1) != 1 ||
 689            write_in_full(fd, key+store.baselen+1, length) != length ||
 690            write_in_full(fd, " = ", 3) != 3)
 691                return 0;
 692        if (quote && write_in_full(fd, "\"", 1) != 1)
 693                return 0;
 694        for (i = 0; value[i]; i++)
 695                switch (value[i]) {
 696                case '\n':
 697                        if (write_in_full(fd, "\\n", 2) != 2)
 698                                return 0;
 699                        break;
 700                case '\t':
 701                        if (write_in_full(fd, "\\t", 2) != 2)
 702                                return 0;
 703                        break;
 704                case '"':
 705                case '\\':
 706                        if (write_in_full(fd, "\\", 1) != 1)
 707                                return 0;
 708                default:
 709                        if (write_in_full(fd, value+i, 1) != 1)
 710                                return 0;
 711                        break;
 712                }
 713        if (quote && write_in_full(fd, "\"", 1) != 1)
 714                return 0;
 715        if (write_in_full(fd, "\n", 1) != 1)
 716                return 0;
 717        return 1;
 718}
 719
 720static ssize_t find_beginning_of_line(const char* contents, size_t size,
 721        size_t offset_, int* found_bracket)
 722{
 723        size_t equal_offset = size, bracket_offset = size;
 724        ssize_t offset;
 725
 726        for (offset = offset_-2; offset > 0
 727                        && contents[offset] != '\n'; offset--)
 728                switch (contents[offset]) {
 729                        case '=': equal_offset = offset; break;
 730                        case ']': bracket_offset = offset; break;
 731                }
 732        if (bracket_offset < equal_offset) {
 733                *found_bracket = 1;
 734                offset = bracket_offset+1;
 735        } else
 736                offset++;
 737
 738        return offset;
 739}
 740
 741int git_config_set(const char* key, const char* value)
 742{
 743        return git_config_set_multivar(key, value, NULL, 0);
 744}
 745
 746/*
 747 * If value==NULL, unset in (remove from) config,
 748 * if value_regex!=NULL, disregard key/value pairs where value does not match.
 749 * if multi_replace==0, nothing, or only one matching key/value is replaced,
 750 *     else all matching key/values (regardless how many) are removed,
 751 *     before the new pair is written.
 752 *
 753 * Returns 0 on success.
 754 *
 755 * This function does this:
 756 *
 757 * - it locks the config file by creating ".git/config.lock"
 758 *
 759 * - it then parses the config using store_aux() as validator to find
 760 *   the position on the key/value pair to replace. If it is to be unset,
 761 *   it must be found exactly once.
 762 *
 763 * - the config file is mmap()ed and the part before the match (if any) is
 764 *   written to the lock file, then the changed part and the rest.
 765 *
 766 * - the config file is removed and the lock file rename()d to it.
 767 *
 768 */
 769int git_config_set_multivar(const char* key, const char* value,
 770        const char* value_regex, int multi_replace)
 771{
 772        int i, dot;
 773        int fd = -1, in_fd;
 774        int ret;
 775        char* config_filename;
 776        struct lock_file *lock = NULL;
 777        const char* last_dot = strrchr(key, '.');
 778
 779        config_filename = getenv(CONFIG_ENVIRONMENT);
 780        if (!config_filename) {
 781                config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
 782                if (!config_filename)
 783                        config_filename  = git_path("config");
 784        }
 785        config_filename = xstrdup(config_filename);
 786
 787        /*
 788         * Since "key" actually contains the section name and the real
 789         * key name separated by a dot, we have to know where the dot is.
 790         */
 791
 792        if (last_dot == NULL) {
 793                fprintf(stderr, "key does not contain a section: %s\n", key);
 794                ret = 2;
 795                goto out_free;
 796        }
 797        store.baselen = last_dot - key;
 798
 799        store.multi_replace = multi_replace;
 800
 801        /*
 802         * Validate the key and while at it, lower case it for matching.
 803         */
 804        store.key = xmalloc(strlen(key) + 1);
 805        dot = 0;
 806        for (i = 0; key[i]; i++) {
 807                unsigned char c = key[i];
 808                if (c == '.')
 809                        dot = 1;
 810                /* Leave the extended basename untouched.. */
 811                if (!dot || i > store.baselen) {
 812                        if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
 813                                fprintf(stderr, "invalid key: %s\n", key);
 814                                free(store.key);
 815                                ret = 1;
 816                                goto out_free;
 817                        }
 818                        c = tolower(c);
 819                } else if (c == '\n') {
 820                        fprintf(stderr, "invalid key (newline): %s\n", key);
 821                        free(store.key);
 822                        ret = 1;
 823                        goto out_free;
 824                }
 825                store.key[i] = c;
 826        }
 827        store.key[i] = 0;
 828
 829        /*
 830         * The lock serves a purpose in addition to locking: the new
 831         * contents of .git/config will be written into it.
 832         */
 833        lock = xcalloc(sizeof(struct lock_file), 1);
 834        fd = hold_lock_file_for_update(lock, config_filename, 0);
 835        if (fd < 0) {
 836                fprintf(stderr, "could not lock config file\n");
 837                free(store.key);
 838                ret = -1;
 839                goto out_free;
 840        }
 841
 842        /*
 843         * If .git/config does not exist yet, write a minimal version.
 844         */
 845        in_fd = open(config_filename, O_RDONLY);
 846        if ( in_fd < 0 ) {
 847                free(store.key);
 848
 849                if ( ENOENT != errno ) {
 850                        error("opening %s: %s", config_filename,
 851                              strerror(errno));
 852                        ret = 3; /* same as "invalid config file" */
 853                        goto out_free;
 854                }
 855                /* if nothing to unset, error out */
 856                if (value == NULL) {
 857                        ret = 5;
 858                        goto out_free;
 859                }
 860
 861                store.key = (char*)key;
 862                if (!store_write_section(fd, key) ||
 863                    !store_write_pair(fd, key, value))
 864                        goto write_err_out;
 865        } else {
 866                struct stat st;
 867                char* contents;
 868                size_t contents_sz, copy_begin, copy_end;
 869                int i, new_line = 0;
 870
 871                if (value_regex == NULL)
 872                        store.value_regex = NULL;
 873                else {
 874                        if (value_regex[0] == '!') {
 875                                store.do_not_match = 1;
 876                                value_regex++;
 877                        } else
 878                                store.do_not_match = 0;
 879
 880                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
 881                        if (regcomp(store.value_regex, value_regex,
 882                                        REG_EXTENDED)) {
 883                                fprintf(stderr, "Invalid pattern: %s\n",
 884                                        value_regex);
 885                                free(store.value_regex);
 886                                ret = 6;
 887                                goto out_free;
 888                        }
 889                }
 890
 891                store.offset[0] = 0;
 892                store.state = START;
 893                store.seen = 0;
 894
 895                /*
 896                 * After this, store.offset will contain the *end* offset
 897                 * of the last match, or remain at 0 if no match was found.
 898                 * As a side effect, we make sure to transform only a valid
 899                 * existing config file.
 900                 */
 901                if (git_config_from_file(store_aux, config_filename)) {
 902                        fprintf(stderr, "invalid config file\n");
 903                        free(store.key);
 904                        if (store.value_regex != NULL) {
 905                                regfree(store.value_regex);
 906                                free(store.value_regex);
 907                        }
 908                        ret = 3;
 909                        goto out_free;
 910                }
 911
 912                free(store.key);
 913                if (store.value_regex != NULL) {
 914                        regfree(store.value_regex);
 915                        free(store.value_regex);
 916                }
 917
 918                /* if nothing to unset, or too many matches, error out */
 919                if ((store.seen == 0 && value == NULL) ||
 920                                (store.seen > 1 && multi_replace == 0)) {
 921                        ret = 5;
 922                        goto out_free;
 923                }
 924
 925                fstat(in_fd, &st);
 926                contents_sz = xsize_t(st.st_size);
 927                contents = xmmap(NULL, contents_sz, PROT_READ,
 928                        MAP_PRIVATE, in_fd, 0);
 929                close(in_fd);
 930
 931                if (store.seen == 0)
 932                        store.seen = 1;
 933
 934                for (i = 0, copy_begin = 0; i < store.seen; i++) {
 935                        if (store.offset[i] == 0) {
 936                                store.offset[i] = copy_end = contents_sz;
 937                        } else if (store.state != KEY_SEEN) {
 938                                copy_end = store.offset[i];
 939                        } else
 940                                copy_end = find_beginning_of_line(
 941                                        contents, contents_sz,
 942                                        store.offset[i]-2, &new_line);
 943
 944                        /* write the first part of the config */
 945                        if (copy_end > copy_begin) {
 946                                if (write_in_full(fd, contents + copy_begin,
 947                                                  copy_end - copy_begin) <
 948                                    copy_end - copy_begin)
 949                                        goto write_err_out;
 950                                if (new_line &&
 951                                    write_in_full(fd, "\n", 1) != 1)
 952                                        goto write_err_out;
 953                        }
 954                        copy_begin = store.offset[i];
 955                }
 956
 957                /* write the pair (value == NULL means unset) */
 958                if (value != NULL) {
 959                        if (store.state == START) {
 960                                if (!store_write_section(fd, key))
 961                                        goto write_err_out;
 962                        }
 963                        if (!store_write_pair(fd, key, value))
 964                                goto write_err_out;
 965                }
 966
 967                /* write the rest of the config */
 968                if (copy_begin < contents_sz)
 969                        if (write_in_full(fd, contents + copy_begin,
 970                                          contents_sz - copy_begin) <
 971                            contents_sz - copy_begin)
 972                                goto write_err_out;
 973
 974                munmap(contents, contents_sz);
 975        }
 976
 977        if (close(fd) || commit_lock_file(lock) < 0) {
 978                fprintf(stderr, "Cannot commit config file!\n");
 979                ret = 4;
 980                goto out_free;
 981        }
 982
 983        /* fd is closed, so don't try to close it below. */
 984        fd = -1;
 985        /*
 986         * lock is committed, so don't try to roll it back below.
 987         * NOTE: Since lockfile.c keeps a linked list of all created
 988         * lock_file structures, it isn't safe to free(lock).  It's
 989         * better to just leave it hanging around.
 990         */
 991        lock = NULL;
 992        ret = 0;
 993
 994out_free:
 995        if (0 <= fd)
 996                close(fd);
 997        if (lock)
 998                rollback_lock_file(lock);
 999        free(config_filename);
1000        return ret;
1001
1002write_err_out:
1003        ret = write_error();
1004        goto out_free;
1005
1006}
1007
1008static int section_name_match (const char *buf, const char *name)
1009{
1010        int i = 0, j = 0, dot = 0;
1011        for (; buf[i] && buf[i] != ']'; i++) {
1012                if (!dot && isspace(buf[i])) {
1013                        dot = 1;
1014                        if (name[j++] != '.')
1015                                break;
1016                        for (i++; isspace(buf[i]); i++)
1017                                ; /* do nothing */
1018                        if (buf[i] != '"')
1019                                break;
1020                        continue;
1021                }
1022                if (buf[i] == '\\' && dot)
1023                        i++;
1024                else if (buf[i] == '"' && dot) {
1025                        for (i++; isspace(buf[i]); i++)
1026                                ; /* do_nothing */
1027                        break;
1028                }
1029                if (buf[i] != name[j++])
1030                        break;
1031        }
1032        return (buf[i] == ']' && name[j] == 0);
1033}
1034
1035/* if new_name == NULL, the section is removed instead */
1036int git_config_rename_section(const char *old_name, const char *new_name)
1037{
1038        int ret = 0, remove = 0;
1039        char *config_filename;
1040        struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1041        int out_fd;
1042        char buf[1024];
1043
1044        config_filename = getenv(CONFIG_ENVIRONMENT);
1045        if (!config_filename) {
1046                config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
1047                if (!config_filename)
1048                        config_filename  = git_path("config");
1049        }
1050        config_filename = xstrdup(config_filename);
1051        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1052        if (out_fd < 0) {
1053                ret = error("Could not lock config file!");
1054                goto out;
1055        }
1056
1057        if (!(config_file = fopen(config_filename, "rb"))) {
1058                /* no config file means nothing to rename, no error */
1059                goto unlock_and_out;
1060        }
1061
1062        while (fgets(buf, sizeof(buf), config_file)) {
1063                int i;
1064                int length;
1065                for (i = 0; buf[i] && isspace(buf[i]); i++)
1066                        ; /* do nothing */
1067                if (buf[i] == '[') {
1068                        /* it's a section */
1069                        if (section_name_match (&buf[i+1], old_name)) {
1070                                ret++;
1071                                if (new_name == NULL) {
1072                                        remove = 1;
1073                                        continue;
1074                                }
1075                                store.baselen = strlen(new_name);
1076                                if (!store_write_section(out_fd, new_name)) {
1077                                        ret = write_error();
1078                                        goto out;
1079                                }
1080                                continue;
1081                        }
1082                        remove = 0;
1083                }
1084                if (remove)
1085                        continue;
1086                length = strlen(buf);
1087                if (write_in_full(out_fd, buf, length) != length) {
1088                        ret = write_error();
1089                        goto out;
1090                }
1091        }
1092        fclose(config_file);
1093 unlock_and_out:
1094        if (close(out_fd) || commit_lock_file(lock) < 0)
1095                        ret = error("Cannot commit config file!");
1096 out:
1097        free(config_filename);
1098        return ret;
1099}