Andrew's git / gitweb.git / config.c
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config.con commit Merge branch 'maint' (41e98de)
   1/*
   2 * GIT - The information manager from hell
   3 *
   4 * Copyright (C) Linus Torvalds, 2005
   5 * Copyright (C) Johannes Schindelin, 2005
   6 *
   7 */
   8#include "cache.h"
   9#include "exec_cmd.h"
  10
  11#define MAXNAME (256)
  12
  13static FILE *config_file;
  14static const char *config_file_name;
  15static int config_linenr;
  16static int config_file_eof;
  17static int zlib_compression_seen;
  18
  19static int get_next_char(void)
  20{
  21        int c;
  22        FILE *f;
  23
  24        c = '\n';
  25        if ((f = config_file) != NULL) {
  26                c = fgetc(f);
  27                if (c == '\r') {
  28                        /* DOS like systems */
  29                        c = fgetc(f);
  30                        if (c != '\n') {
  31                                ungetc(c, f);
  32                                c = '\r';
  33                        }
  34                }
  35                if (c == '\n')
  36                        config_linenr++;
  37                if (c == EOF) {
  38                        config_file_eof = 1;
  39                        c = '\n';
  40                }
  41        }
  42        return c;
  43}
  44
  45static char *parse_value(void)
  46{
  47        static char value[1024];
  48        int quote = 0, comment = 0, len = 0, space = 0;
  49
  50        for (;;) {
  51                int c = get_next_char();
  52                if (len >= sizeof(value))
  53                        return NULL;
  54                if (c == '\n') {
  55                        if (quote)
  56                                return NULL;
  57                        value[len] = 0;
  58                        return value;
  59                }
  60                if (comment)
  61                        continue;
  62                if (isspace(c) && !quote) {
  63                        space = 1;
  64                        continue;
  65                }
  66                if (!quote) {
  67                        if (c == ';' || c == '#') {
  68                                comment = 1;
  69                                continue;
  70                        }
  71                }
  72                if (space) {
  73                        if (len)
  74                                value[len++] = ' ';
  75                        space = 0;
  76                }
  77                if (c == '\\') {
  78                        c = get_next_char();
  79                        switch (c) {
  80                        case '\n':
  81                                continue;
  82                        case 't':
  83                                c = '\t';
  84                                break;
  85                        case 'b':
  86                                c = '\b';
  87                                break;
  88                        case 'n':
  89                                c = '\n';
  90                                break;
  91                        /* Some characters escape as themselves */
  92                        case '\\': case '"':
  93                                break;
  94                        /* Reject unknown escape sequences */
  95                        default:
  96                                return NULL;
  97                        }
  98                        value[len++] = c;
  99                        continue;
 100                }
 101                if (c == '"') {
 102                        quote = 1-quote;
 103                        continue;
 104                }
 105                value[len++] = c;
 106        }
 107}
 108
 109static inline int iskeychar(int c)
 110{
 111        return isalnum(c) || c == '-';
 112}
 113
 114static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)
 115{
 116        int c;
 117        char *value;
 118
 119        /* Get the full name */
 120        for (;;) {
 121                c = get_next_char();
 122                if (config_file_eof)
 123                        break;
 124                if (!iskeychar(c))
 125                        break;
 126                name[len++] = tolower(c);
 127                if (len >= MAXNAME)
 128                        return -1;
 129        }
 130        name[len] = 0;
 131        while (c == ' ' || c == '\t')
 132                c = get_next_char();
 133
 134        value = NULL;
 135        if (c != '\n') {
 136                if (c != '=')
 137                        return -1;
 138                value = parse_value();
 139                if (!value)
 140                        return -1;
 141        }
 142        return fn(name, value, data);
 143}
 144
 145static int get_extended_base_var(char *name, int baselen, int c)
 146{
 147        do {
 148                if (c == '\n')
 149                        return -1;
 150                c = get_next_char();
 151        } while (isspace(c));
 152
 153        /* We require the format to be '[base "extension"]' */
 154        if (c != '"')
 155                return -1;
 156        name[baselen++] = '.';
 157
 158        for (;;) {
 159                int c = get_next_char();
 160                if (c == '\n')
 161                        return -1;
 162                if (c == '"')
 163                        break;
 164                if (c == '\\') {
 165                        c = get_next_char();
 166                        if (c == '\n')
 167                                return -1;
 168                }
 169                name[baselen++] = c;
 170                if (baselen > MAXNAME / 2)
 171                        return -1;
 172        }
 173
 174        /* Final ']' */
 175        if (get_next_char() != ']')
 176                return -1;
 177        return baselen;
 178}
 179
 180static int get_base_var(char *name)
 181{
 182        int baselen = 0;
 183
 184        for (;;) {
 185                int c = get_next_char();
 186                if (config_file_eof)
 187                        return -1;
 188                if (c == ']')
 189                        return baselen;
 190                if (isspace(c))
 191                        return get_extended_base_var(name, baselen, c);
 192                if (!iskeychar(c) && c != '.')
 193                        return -1;
 194                if (baselen > MAXNAME / 2)
 195                        return -1;
 196                name[baselen++] = tolower(c);
 197        }
 198}
 199
 200static int git_parse_file(config_fn_t fn, void *data)
 201{
 202        int comment = 0;
 203        int baselen = 0;
 204        static char var[MAXNAME];
 205
 206        for (;;) {
 207                int c = get_next_char();
 208                if (c == '\n') {
 209                        if (config_file_eof)
 210                                return 0;
 211                        comment = 0;
 212                        continue;
 213                }
 214                if (comment || isspace(c))
 215                        continue;
 216                if (c == '#' || c == ';') {
 217                        comment = 1;
 218                        continue;
 219                }
 220                if (c == '[') {
 221                        baselen = get_base_var(var);
 222                        if (baselen <= 0)
 223                                break;
 224                        var[baselen++] = '.';
 225                        var[baselen] = 0;
 226                        continue;
 227                }
 228                if (!isalpha(c))
 229                        break;
 230                var[baselen] = tolower(c);
 231                if (get_value(fn, data, var, baselen+1) < 0)
 232                        break;
 233        }
 234        die("bad config file line %d in %s", config_linenr, config_file_name);
 235}
 236
 237static int parse_unit_factor(const char *end, unsigned long *val)
 238{
 239        if (!*end)
 240                return 1;
 241        else if (!strcasecmp(end, "k")) {
 242                *val *= 1024;
 243                return 1;
 244        }
 245        else if (!strcasecmp(end, "m")) {
 246                *val *= 1024 * 1024;
 247                return 1;
 248        }
 249        else if (!strcasecmp(end, "g")) {
 250                *val *= 1024 * 1024 * 1024;
 251                return 1;
 252        }
 253        return 0;
 254}
 255
 256int git_parse_long(const char *value, long *ret)
 257{
 258        if (value && *value) {
 259                char *end;
 260                long val = strtol(value, &end, 0);
 261                unsigned long factor = 1;
 262                if (!parse_unit_factor(end, &factor))
 263                        return 0;
 264                *ret = val * factor;
 265                return 1;
 266        }
 267        return 0;
 268}
 269
 270int git_parse_ulong(const char *value, unsigned long *ret)
 271{
 272        if (value && *value) {
 273                char *end;
 274                unsigned long val = strtoul(value, &end, 0);
 275                if (!parse_unit_factor(end, &val))
 276                        return 0;
 277                *ret = val;
 278                return 1;
 279        }
 280        return 0;
 281}
 282
 283static void die_bad_config(const char *name)
 284{
 285        if (config_file_name)
 286                die("bad config value for '%s' in %s", name, config_file_name);
 287        die("bad config value for '%s'", name);
 288}
 289
 290int git_config_int(const char *name, const char *value)
 291{
 292        long ret;
 293        if (!git_parse_long(value, &ret))
 294                die_bad_config(name);
 295        return ret;
 296}
 297
 298unsigned long git_config_ulong(const char *name, const char *value)
 299{
 300        unsigned long ret;
 301        if (!git_parse_ulong(value, &ret))
 302                die_bad_config(name);
 303        return ret;
 304}
 305
 306int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 307{
 308        *is_bool = 1;
 309        if (!value)
 310                return 1;
 311        if (!*value)
 312                return 0;
 313        if (!strcasecmp(value, "true") || !strcasecmp(value, "yes"))
 314                return 1;
 315        if (!strcasecmp(value, "false") || !strcasecmp(value, "no"))
 316                return 0;
 317        *is_bool = 0;
 318        return git_config_int(name, value);
 319}
 320
 321int git_config_bool(const char *name, const char *value)
 322{
 323        int discard;
 324        return !!git_config_bool_or_int(name, value, &discard);
 325}
 326
 327int git_config_string(const char **dest, const char *var, const char *value)
 328{
 329        if (!value)
 330                return config_error_nonbool(var);
 331        *dest = xstrdup(value);
 332        return 0;
 333}
 334
 335static int git_default_core_config(const char *var, const char *value)
 336{
 337        /* This needs a better name */
 338        if (!strcmp(var, "core.filemode")) {
 339                trust_executable_bit = git_config_bool(var, value);
 340                return 0;
 341        }
 342
 343        if (!strcmp(var, "core.quotepath")) {
 344                quote_path_fully = git_config_bool(var, value);
 345                return 0;
 346        }
 347
 348        if (!strcmp(var, "core.symlinks")) {
 349                has_symlinks = git_config_bool(var, value);
 350                return 0;
 351        }
 352
 353        if (!strcmp(var, "core.ignorecase")) {
 354                ignore_case = git_config_bool(var, value);
 355                return 0;
 356        }
 357
 358        if (!strcmp(var, "core.bare")) {
 359                is_bare_repository_cfg = git_config_bool(var, value);
 360                return 0;
 361        }
 362
 363        if (!strcmp(var, "core.ignorestat")) {
 364                assume_unchanged = git_config_bool(var, value);
 365                return 0;
 366        }
 367
 368        if (!strcmp(var, "core.prefersymlinkrefs")) {
 369                prefer_symlink_refs = git_config_bool(var, value);
 370                return 0;
 371        }
 372
 373        if (!strcmp(var, "core.logallrefupdates")) {
 374                log_all_ref_updates = git_config_bool(var, value);
 375                return 0;
 376        }
 377
 378        if (!strcmp(var, "core.warnambiguousrefs")) {
 379                warn_ambiguous_refs = git_config_bool(var, value);
 380                return 0;
 381        }
 382
 383        if (!strcmp(var, "core.loosecompression")) {
 384                int level = git_config_int(var, value);
 385                if (level == -1)
 386                        level = Z_DEFAULT_COMPRESSION;
 387                else if (level < 0 || level > Z_BEST_COMPRESSION)
 388                        die("bad zlib compression level %d", level);
 389                zlib_compression_level = level;
 390                zlib_compression_seen = 1;
 391                return 0;
 392        }
 393
 394        if (!strcmp(var, "core.compression")) {
 395                int level = git_config_int(var, value);
 396                if (level == -1)
 397                        level = Z_DEFAULT_COMPRESSION;
 398                else if (level < 0 || level > Z_BEST_COMPRESSION)
 399                        die("bad zlib compression level %d", level);
 400                core_compression_level = level;
 401                core_compression_seen = 1;
 402                if (!zlib_compression_seen)
 403                        zlib_compression_level = level;
 404                return 0;
 405        }
 406
 407        if (!strcmp(var, "core.packedgitwindowsize")) {
 408                int pgsz_x2 = getpagesize() * 2;
 409                packed_git_window_size = git_config_int(var, value);
 410
 411                /* This value must be multiple of (pagesize * 2) */
 412                packed_git_window_size /= pgsz_x2;
 413                if (packed_git_window_size < 1)
 414                        packed_git_window_size = 1;
 415                packed_git_window_size *= pgsz_x2;
 416                return 0;
 417        }
 418
 419        if (!strcmp(var, "core.packedgitlimit")) {
 420                packed_git_limit = git_config_int(var, value);
 421                return 0;
 422        }
 423
 424        if (!strcmp(var, "core.deltabasecachelimit")) {
 425                delta_base_cache_limit = git_config_int(var, value);
 426                return 0;
 427        }
 428
 429        if (!strcmp(var, "core.autocrlf")) {
 430                if (value && !strcasecmp(value, "input")) {
 431                        auto_crlf = -1;
 432                        return 0;
 433                }
 434                auto_crlf = git_config_bool(var, value);
 435                return 0;
 436        }
 437
 438        if (!strcmp(var, "core.safecrlf")) {
 439                if (value && !strcasecmp(value, "warn")) {
 440                        safe_crlf = SAFE_CRLF_WARN;
 441                        return 0;
 442                }
 443                safe_crlf = git_config_bool(var, value);
 444                return 0;
 445        }
 446
 447        if (!strcmp(var, "core.pager"))
 448                return git_config_string(&pager_program, var, value);
 449
 450        if (!strcmp(var, "core.editor"))
 451                return git_config_string(&editor_program, var, value);
 452
 453        if (!strcmp(var, "core.excludesfile"))
 454                return git_config_string(&excludes_file, var, value);
 455
 456        if (!strcmp(var, "core.whitespace")) {
 457                if (!value)
 458                        return config_error_nonbool(var);
 459                whitespace_rule_cfg = parse_whitespace_rule(value);
 460                return 0;
 461        }
 462
 463        if (!strcmp(var, "core.fsyncobjectfiles")) {
 464                fsync_object_files = git_config_bool(var, value);
 465                return 0;
 466        }
 467
 468        /* Add other config variables here and to Documentation/config.txt. */
 469        return 0;
 470}
 471
 472static int git_default_user_config(const char *var, const char *value)
 473{
 474        if (!strcmp(var, "user.name")) {
 475                if (!value)
 476                        return config_error_nonbool(var);
 477                strlcpy(git_default_name, value, sizeof(git_default_name));
 478                if (git_default_email[0])
 479                        user_ident_explicitly_given = 1;
 480                return 0;
 481        }
 482
 483        if (!strcmp(var, "user.email")) {
 484                if (!value)
 485                        return config_error_nonbool(var);
 486                strlcpy(git_default_email, value, sizeof(git_default_email));
 487                if (git_default_name[0])
 488                        user_ident_explicitly_given = 1;
 489                return 0;
 490        }
 491
 492        /* Add other config variables here and to Documentation/config.txt. */
 493        return 0;
 494}
 495
 496static int git_default_i18n_config(const char *var, const char *value)
 497{
 498        if (!strcmp(var, "i18n.commitencoding"))
 499                return git_config_string(&git_commit_encoding, var, value);
 500
 501        if (!strcmp(var, "i18n.logoutputencoding"))
 502                return git_config_string(&git_log_output_encoding, var, value);
 503
 504        /* Add other config variables here and to Documentation/config.txt. */
 505        return 0;
 506}
 507
 508static int git_default_branch_config(const char *var, const char *value)
 509{
 510        if (!strcmp(var, "branch.autosetupmerge")) {
 511                if (value && !strcasecmp(value, "always")) {
 512                        git_branch_track = BRANCH_TRACK_ALWAYS;
 513                        return 0;
 514                }
 515                git_branch_track = git_config_bool(var, value);
 516                return 0;
 517        }
 518        if (!strcmp(var, "branch.autosetuprebase")) {
 519                if (!value)
 520                        return config_error_nonbool(var);
 521                else if (!strcmp(value, "never"))
 522                        autorebase = AUTOREBASE_NEVER;
 523                else if (!strcmp(value, "local"))
 524                        autorebase = AUTOREBASE_LOCAL;
 525                else if (!strcmp(value, "remote"))
 526                        autorebase = AUTOREBASE_REMOTE;
 527                else if (!strcmp(value, "always"))
 528                        autorebase = AUTOREBASE_ALWAYS;
 529                else
 530                        return error("Malformed value for %s", var);
 531                return 0;
 532        }
 533
 534        /* Add other config variables here and to Documentation/config.txt. */
 535        return 0;
 536}
 537
 538int git_default_config(const char *var, const char *value, void *dummy)
 539{
 540        if (!prefixcmp(var, "core."))
 541                return git_default_core_config(var, value);
 542
 543        if (!prefixcmp(var, "user."))
 544                return git_default_user_config(var, value);
 545
 546        if (!prefixcmp(var, "i18n."))
 547                return git_default_i18n_config(var, value);
 548
 549        if (!prefixcmp(var, "branch."))
 550                return git_default_branch_config(var, value);
 551
 552        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 553                pager_use_color = git_config_bool(var,value);
 554                return 0;
 555        }
 556
 557        /* Add other config variables here and to Documentation/config.txt. */
 558        return 0;
 559}
 560
 561int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 562{
 563        int ret;
 564        FILE *f = fopen(filename, "r");
 565
 566        ret = -1;
 567        if (f) {
 568                config_file = f;
 569                config_file_name = filename;
 570                config_linenr = 1;
 571                config_file_eof = 0;
 572                ret = git_parse_file(fn, data);
 573                fclose(f);
 574                config_file_name = NULL;
 575        }
 576        return ret;
 577}
 578
 579const char *git_etc_gitconfig(void)
 580{
 581        static const char *system_wide;
 582        if (!system_wide) {
 583                system_wide = ETC_GITCONFIG;
 584                if (!is_absolute_path(system_wide)) {
 585                        /* interpret path relative to exec-dir */
 586                        struct strbuf d = STRBUF_INIT;
 587                        strbuf_addf(&d, "%s/%s", git_exec_path(), system_wide);
 588                        system_wide = strbuf_detach(&d, NULL);
 589                }
 590        }
 591        return system_wide;
 592}
 593
 594static int git_env_bool(const char *k, int def)
 595{
 596        const char *v = getenv(k);
 597        return v ? git_config_bool(k, v) : def;
 598}
 599
 600int git_config_system(void)
 601{
 602        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 603}
 604
 605int git_config_global(void)
 606{
 607        return !git_env_bool("GIT_CONFIG_NOGLOBAL", 0);
 608}
 609
 610int git_config(config_fn_t fn, void *data)
 611{
 612        int ret = 0;
 613        char *repo_config = NULL;
 614        const char *home = NULL, *filename;
 615
 616        /* $GIT_CONFIG makes git read _only_ the given config file,
 617         * $GIT_CONFIG_LOCAL will make it process it in addition to the
 618         * global config file, the same way it would the per-repository
 619         * config file otherwise. */
 620        filename = getenv(CONFIG_ENVIRONMENT);
 621        if (!filename) {
 622                if (git_config_system() && !access(git_etc_gitconfig(), R_OK))
 623                        ret += git_config_from_file(fn, git_etc_gitconfig(),
 624                                data);
 625                home = getenv("HOME");
 626                filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
 627                if (!filename)
 628                        filename = repo_config = xstrdup(git_path("config"));
 629        }
 630
 631        if (git_config_global() && home) {
 632                char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
 633                if (!access(user_config, R_OK))
 634                        ret = git_config_from_file(fn, user_config, data);
 635                free(user_config);
 636        }
 637
 638        ret += git_config_from_file(fn, filename, data);
 639        free(repo_config);
 640        return ret;
 641}
 642
 643/*
 644 * Find all the stuff for git_config_set() below.
 645 */
 646
 647#define MAX_MATCHES 512
 648
 649static struct {
 650        int baselen;
 651        char* key;
 652        int do_not_match;
 653        regex_t* value_regex;
 654        int multi_replace;
 655        size_t offset[MAX_MATCHES];
 656        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
 657        int seen;
 658} store;
 659
 660static int matches(const char* key, const char* value)
 661{
 662        return !strcmp(key, store.key) &&
 663                (store.value_regex == NULL ||
 664                 (store.do_not_match ^
 665                  !regexec(store.value_regex, value, 0, NULL, 0)));
 666}
 667
 668static int store_aux(const char* key, const char* value, void *cb)
 669{
 670        const char *ep;
 671        size_t section_len;
 672
 673        switch (store.state) {
 674        case KEY_SEEN:
 675                if (matches(key, value)) {
 676                        if (store.seen == 1 && store.multi_replace == 0) {
 677                                warning("%s has multiple values", key);
 678                        } else if (store.seen >= MAX_MATCHES) {
 679                                error("too many matches for %s", key);
 680                                return 1;
 681                        }
 682
 683                        store.offset[store.seen] = ftell(config_file);
 684                        store.seen++;
 685                }
 686                break;
 687        case SECTION_SEEN:
 688                /*
 689                 * What we are looking for is in store.key (both
 690                 * section and var), and its section part is baselen
 691                 * long.  We found key (again, both section and var).
 692                 * We would want to know if this key is in the same
 693                 * section as what we are looking for.  We already
 694                 * know we are in the same section as what should
 695                 * hold store.key.
 696                 */
 697                ep = strrchr(key, '.');
 698                section_len = ep - key;
 699
 700                if ((section_len != store.baselen) ||
 701                    memcmp(key, store.key, section_len+1)) {
 702                        store.state = SECTION_END_SEEN;
 703                        break;
 704                }
 705
 706                /*
 707                 * Do not increment matches: this is no match, but we
 708                 * just made sure we are in the desired section.
 709                 */
 710                store.offset[store.seen] = ftell(config_file);
 711                /* fallthru */
 712        case SECTION_END_SEEN:
 713        case START:
 714                if (matches(key, value)) {
 715                        store.offset[store.seen] = ftell(config_file);
 716                        store.state = KEY_SEEN;
 717                        store.seen++;
 718                } else {
 719                        if (strrchr(key, '.') - key == store.baselen &&
 720                              !strncmp(key, store.key, store.baselen)) {
 721                                        store.state = SECTION_SEEN;
 722                                        store.offset[store.seen] = ftell(config_file);
 723                        }
 724                }
 725        }
 726        return 0;
 727}
 728
 729static int write_error(const char *filename)
 730{
 731        error("failed to write new configuration file %s", filename);
 732
 733        /* Same error code as "failed to rename". */
 734        return 4;
 735}
 736
 737static int store_write_section(int fd, const char* key)
 738{
 739        const char *dot;
 740        int i, success;
 741        struct strbuf sb;
 742
 743        strbuf_init(&sb, 0);
 744        dot = memchr(key, '.', store.baselen);
 745        if (dot) {
 746                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
 747                for (i = dot - key + 1; i < store.baselen; i++) {
 748                        if (key[i] == '"' || key[i] == '\\')
 749                                strbuf_addch(&sb, '\\');
 750                        strbuf_addch(&sb, key[i]);
 751                }
 752                strbuf_addstr(&sb, "\"]\n");
 753        } else {
 754                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
 755        }
 756
 757        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
 758        strbuf_release(&sb);
 759
 760        return success;
 761}
 762
 763static int store_write_pair(int fd, const char* key, const char* value)
 764{
 765        int i, success;
 766        int length = strlen(key + store.baselen + 1);
 767        const char *quote = "";
 768        struct strbuf sb;
 769
 770        /*
 771         * Check to see if the value needs to be surrounded with a dq pair.
 772         * Note that problematic characters are always backslash-quoted; this
 773         * check is about not losing leading or trailing SP and strings that
 774         * follow beginning-of-comment characters (i.e. ';' and '#') by the
 775         * configuration parser.
 776         */
 777        if (value[0] == ' ')
 778                quote = "\"";
 779        for (i = 0; value[i]; i++)
 780                if (value[i] == ';' || value[i] == '#')
 781                        quote = "\"";
 782        if (i && value[i - 1] == ' ')
 783                quote = "\"";
 784
 785        strbuf_init(&sb, 0);
 786        strbuf_addf(&sb, "\t%.*s = %s",
 787                    length, key + store.baselen + 1, quote);
 788
 789        for (i = 0; value[i]; i++)
 790                switch (value[i]) {
 791                case '\n':
 792                        strbuf_addstr(&sb, "\\n");
 793                        break;
 794                case '\t':
 795                        strbuf_addstr(&sb, "\\t");
 796                        break;
 797                case '"':
 798                case '\\':
 799                        strbuf_addch(&sb, '\\');
 800                default:
 801                        strbuf_addch(&sb, value[i]);
 802                        break;
 803                }
 804        strbuf_addf(&sb, "%s\n", quote);
 805
 806        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
 807        strbuf_release(&sb);
 808
 809        return success;
 810}
 811
 812static ssize_t find_beginning_of_line(const char* contents, size_t size,
 813        size_t offset_, int* found_bracket)
 814{
 815        size_t equal_offset = size, bracket_offset = size;
 816        ssize_t offset;
 817
 818contline:
 819        for (offset = offset_-2; offset > 0
 820                        && contents[offset] != '\n'; offset--)
 821                switch (contents[offset]) {
 822                        case '=': equal_offset = offset; break;
 823                        case ']': bracket_offset = offset; break;
 824                }
 825        if (offset > 0 && contents[offset-1] == '\\') {
 826                offset_ = offset;
 827                goto contline;
 828        }
 829        if (bracket_offset < equal_offset) {
 830                *found_bracket = 1;
 831                offset = bracket_offset+1;
 832        } else
 833                offset++;
 834
 835        return offset;
 836}
 837
 838int git_config_set(const char* key, const char* value)
 839{
 840        return git_config_set_multivar(key, value, NULL, 0);
 841}
 842
 843/*
 844 * If value==NULL, unset in (remove from) config,
 845 * if value_regex!=NULL, disregard key/value pairs where value does not match.
 846 * if multi_replace==0, nothing, or only one matching key/value is replaced,
 847 *     else all matching key/values (regardless how many) are removed,
 848 *     before the new pair is written.
 849 *
 850 * Returns 0 on success.
 851 *
 852 * This function does this:
 853 *
 854 * - it locks the config file by creating ".git/config.lock"
 855 *
 856 * - it then parses the config using store_aux() as validator to find
 857 *   the position on the key/value pair to replace. If it is to be unset,
 858 *   it must be found exactly once.
 859 *
 860 * - the config file is mmap()ed and the part before the match (if any) is
 861 *   written to the lock file, then the changed part and the rest.
 862 *
 863 * - the config file is removed and the lock file rename()d to it.
 864 *
 865 */
 866int git_config_set_multivar(const char* key, const char* value,
 867        const char* value_regex, int multi_replace)
 868{
 869        int i, dot;
 870        int fd = -1, in_fd;
 871        int ret;
 872        char* config_filename;
 873        struct lock_file *lock = NULL;
 874        const char* last_dot = strrchr(key, '.');
 875
 876        config_filename = getenv(CONFIG_ENVIRONMENT);
 877        if (!config_filename) {
 878                config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
 879                if (!config_filename)
 880                        config_filename  = git_path("config");
 881        }
 882        config_filename = xstrdup(config_filename);
 883
 884        /*
 885         * Since "key" actually contains the section name and the real
 886         * key name separated by a dot, we have to know where the dot is.
 887         */
 888
 889        if (last_dot == NULL) {
 890                error("key does not contain a section: %s", key);
 891                ret = 2;
 892                goto out_free;
 893        }
 894        store.baselen = last_dot - key;
 895
 896        store.multi_replace = multi_replace;
 897
 898        /*
 899         * Validate the key and while at it, lower case it for matching.
 900         */
 901        store.key = xmalloc(strlen(key) + 1);
 902        dot = 0;
 903        for (i = 0; key[i]; i++) {
 904                unsigned char c = key[i];
 905                if (c == '.')
 906                        dot = 1;
 907                /* Leave the extended basename untouched.. */
 908                if (!dot || i > store.baselen) {
 909                        if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
 910                                error("invalid key: %s", key);
 911                                free(store.key);
 912                                ret = 1;
 913                                goto out_free;
 914                        }
 915                        c = tolower(c);
 916                } else if (c == '\n') {
 917                        error("invalid key (newline): %s", key);
 918                        free(store.key);
 919                        ret = 1;
 920                        goto out_free;
 921                }
 922                store.key[i] = c;
 923        }
 924        store.key[i] = 0;
 925
 926        /*
 927         * The lock serves a purpose in addition to locking: the new
 928         * contents of .git/config will be written into it.
 929         */
 930        lock = xcalloc(sizeof(struct lock_file), 1);
 931        fd = hold_lock_file_for_update(lock, config_filename, 0);
 932        if (fd < 0) {
 933                error("could not lock config file %s", config_filename);
 934                free(store.key);
 935                ret = -1;
 936                goto out_free;
 937        }
 938
 939        /*
 940         * If .git/config does not exist yet, write a minimal version.
 941         */
 942        in_fd = open(config_filename, O_RDONLY);
 943        if ( in_fd < 0 ) {
 944                free(store.key);
 945
 946                if ( ENOENT != errno ) {
 947                        error("opening %s: %s", config_filename,
 948                              strerror(errno));
 949                        ret = 3; /* same as "invalid config file" */
 950                        goto out_free;
 951                }
 952                /* if nothing to unset, error out */
 953                if (value == NULL) {
 954                        ret = 5;
 955                        goto out_free;
 956                }
 957
 958                store.key = (char*)key;
 959                if (!store_write_section(fd, key) ||
 960                    !store_write_pair(fd, key, value))
 961                        goto write_err_out;
 962        } else {
 963                struct stat st;
 964                char* contents;
 965                size_t contents_sz, copy_begin, copy_end;
 966                int i, new_line = 0;
 967
 968                if (value_regex == NULL)
 969                        store.value_regex = NULL;
 970                else {
 971                        if (value_regex[0] == '!') {
 972                                store.do_not_match = 1;
 973                                value_regex++;
 974                        } else
 975                                store.do_not_match = 0;
 976
 977                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
 978                        if (regcomp(store.value_regex, value_regex,
 979                                        REG_EXTENDED)) {
 980                                error("invalid pattern: %s", value_regex);
 981                                free(store.value_regex);
 982                                ret = 6;
 983                                goto out_free;
 984                        }
 985                }
 986
 987                store.offset[0] = 0;
 988                store.state = START;
 989                store.seen = 0;
 990
 991                /*
 992                 * After this, store.offset will contain the *end* offset
 993                 * of the last match, or remain at 0 if no match was found.
 994                 * As a side effect, we make sure to transform only a valid
 995                 * existing config file.
 996                 */
 997                if (git_config_from_file(store_aux, config_filename, NULL)) {
 998                        error("invalid config file %s", config_filename);
 999                        free(store.key);
1000                        if (store.value_regex != NULL) {
1001                                regfree(store.value_regex);
1002                                free(store.value_regex);
1003                        }
1004                        ret = 3;
1005                        goto out_free;
1006                }
1007
1008                free(store.key);
1009                if (store.value_regex != NULL) {
1010                        regfree(store.value_regex);
1011                        free(store.value_regex);
1012                }
1013
1014                /* if nothing to unset, or too many matches, error out */
1015                if ((store.seen == 0 && value == NULL) ||
1016                                (store.seen > 1 && multi_replace == 0)) {
1017                        ret = 5;
1018                        goto out_free;
1019                }
1020
1021                fstat(in_fd, &st);
1022                contents_sz = xsize_t(st.st_size);
1023                contents = xmmap(NULL, contents_sz, PROT_READ,
1024                        MAP_PRIVATE, in_fd, 0);
1025                close(in_fd);
1026
1027                if (store.seen == 0)
1028                        store.seen = 1;
1029
1030                for (i = 0, copy_begin = 0; i < store.seen; i++) {
1031                        if (store.offset[i] == 0) {
1032                                store.offset[i] = copy_end = contents_sz;
1033                        } else if (store.state != KEY_SEEN) {
1034                                copy_end = store.offset[i];
1035                        } else
1036                                copy_end = find_beginning_of_line(
1037                                        contents, contents_sz,
1038                                        store.offset[i]-2, &new_line);
1039
1040                        if (copy_end > 0 && contents[copy_end-1] != '\n')
1041                                new_line = 1;
1042
1043                        /* write the first part of the config */
1044                        if (copy_end > copy_begin) {
1045                                if (write_in_full(fd, contents + copy_begin,
1046                                                  copy_end - copy_begin) <
1047                                    copy_end - copy_begin)
1048                                        goto write_err_out;
1049                                if (new_line &&
1050                                    write_in_full(fd, "\n", 1) != 1)
1051                                        goto write_err_out;
1052                        }
1053                        copy_begin = store.offset[i];
1054                }
1055
1056                /* write the pair (value == NULL means unset) */
1057                if (value != NULL) {
1058                        if (store.state == START) {
1059                                if (!store_write_section(fd, key))
1060                                        goto write_err_out;
1061                        }
1062                        if (!store_write_pair(fd, key, value))
1063                                goto write_err_out;
1064                }
1065
1066                /* write the rest of the config */
1067                if (copy_begin < contents_sz)
1068                        if (write_in_full(fd, contents + copy_begin,
1069                                          contents_sz - copy_begin) <
1070                            contents_sz - copy_begin)
1071                                goto write_err_out;
1072
1073                munmap(contents, contents_sz);
1074        }
1075
1076        if (commit_lock_file(lock) < 0) {
1077                error("could not commit config file %s", config_filename);
1078                ret = 4;
1079                goto out_free;
1080        }
1081
1082        /*
1083         * lock is committed, so don't try to roll it back below.
1084         * NOTE: Since lockfile.c keeps a linked list of all created
1085         * lock_file structures, it isn't safe to free(lock).  It's
1086         * better to just leave it hanging around.
1087         */
1088        lock = NULL;
1089        ret = 0;
1090
1091out_free:
1092        if (lock)
1093                rollback_lock_file(lock);
1094        free(config_filename);
1095        return ret;
1096
1097write_err_out:
1098        ret = write_error(lock->filename);
1099        goto out_free;
1100
1101}
1102
1103static int section_name_match (const char *buf, const char *name)
1104{
1105        int i = 0, j = 0, dot = 0;
1106        for (; buf[i] && buf[i] != ']'; i++) {
1107                if (!dot && isspace(buf[i])) {
1108                        dot = 1;
1109                        if (name[j++] != '.')
1110                                break;
1111                        for (i++; isspace(buf[i]); i++)
1112                                ; /* do nothing */
1113                        if (buf[i] != '"')
1114                                break;
1115                        continue;
1116                }
1117                if (buf[i] == '\\' && dot)
1118                        i++;
1119                else if (buf[i] == '"' && dot) {
1120                        for (i++; isspace(buf[i]); i++)
1121                                ; /* do_nothing */
1122                        break;
1123                }
1124                if (buf[i] != name[j++])
1125                        break;
1126        }
1127        return (buf[i] == ']' && name[j] == 0);
1128}
1129
1130/* if new_name == NULL, the section is removed instead */
1131int git_config_rename_section(const char *old_name, const char *new_name)
1132{
1133        int ret = 0, remove = 0;
1134        char *config_filename;
1135        struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1136        int out_fd;
1137        char buf[1024];
1138
1139        config_filename = getenv(CONFIG_ENVIRONMENT);
1140        if (!config_filename) {
1141                config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
1142                if (!config_filename)
1143                        config_filename  = git_path("config");
1144        }
1145        config_filename = xstrdup(config_filename);
1146        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1147        if (out_fd < 0) {
1148                ret = error("could not lock config file %s", config_filename);
1149                goto out;
1150        }
1151
1152        if (!(config_file = fopen(config_filename, "rb"))) {
1153                /* no config file means nothing to rename, no error */
1154                goto unlock_and_out;
1155        }
1156
1157        while (fgets(buf, sizeof(buf), config_file)) {
1158                int i;
1159                int length;
1160                for (i = 0; buf[i] && isspace(buf[i]); i++)
1161                        ; /* do nothing */
1162                if (buf[i] == '[') {
1163                        /* it's a section */
1164                        if (section_name_match (&buf[i+1], old_name)) {
1165                                ret++;
1166                                if (new_name == NULL) {
1167                                        remove = 1;
1168                                        continue;
1169                                }
1170                                store.baselen = strlen(new_name);
1171                                if (!store_write_section(out_fd, new_name)) {
1172                                        ret = write_error(lock->filename);
1173                                        goto out;
1174                                }
1175                                continue;
1176                        }
1177                        remove = 0;
1178                }
1179                if (remove)
1180                        continue;
1181                length = strlen(buf);
1182                if (write_in_full(out_fd, buf, length) != length) {
1183                        ret = write_error(lock->filename);
1184                        goto out;
1185                }
1186        }
1187        fclose(config_file);
1188 unlock_and_out:
1189        if (commit_lock_file(lock) < 0)
1190                ret = error("could not commit config file %s", config_filename);
1191 out:
1192        free(config_filename);
1193        return ret;
1194}
1195
1196/*
1197 * Call this to report error for your variable that should not
1198 * get a boolean value (i.e. "[my] var" means "true").
1199 */
1200int config_error_nonbool(const char *var)
1201{
1202        return error("Missing value for '%s'", var);
1203}