config.con commit Merge branch 'sb/wt-status-cleanup' (8a3ff85)
   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 "lockfile.h"
  10#include "exec_cmd.h"
  11#include "strbuf.h"
  12#include "quote.h"
  13#include "hashmap.h"
  14#include "string-list.h"
  15#include "utf8.h"
  16#include "dir.h"
  17
  18struct config_source {
  19        struct config_source *prev;
  20        union {
  21                FILE *file;
  22                struct config_buf {
  23                        const char *buf;
  24                        size_t len;
  25                        size_t pos;
  26                } buf;
  27        } u;
  28        enum config_origin_type origin_type;
  29        const char *name;
  30        const char *path;
  31        int die_on_error;
  32        int linenr;
  33        int eof;
  34        struct strbuf value;
  35        struct strbuf var;
  36
  37        int (*do_fgetc)(struct config_source *c);
  38        int (*do_ungetc)(int c, struct config_source *conf);
  39        long (*do_ftell)(struct config_source *c);
  40};
  41
  42/*
  43 * These variables record the "current" config source, which
  44 * can be accessed by parsing callbacks.
  45 *
  46 * The "cf" variable will be non-NULL only when we are actually parsing a real
  47 * config source (file, blob, cmdline, etc).
  48 *
  49 * The "current_config_kvi" variable will be non-NULL only when we are feeding
  50 * cached config from a configset into a callback.
  51 *
  52 * They should generally never be non-NULL at the same time. If they are both
  53 * NULL, then we aren't parsing anything (and depending on the function looking
  54 * at the variables, it's either a bug for it to be called in the first place,
  55 * or it's a function which can be reused for non-config purposes, and should
  56 * fall back to some sane behavior).
  57 */
  58static struct config_source *cf;
  59static struct key_value_info *current_config_kvi;
  60
  61/*
  62 * Similar to the variables above, this gives access to the "scope" of the
  63 * current value (repo, global, etc). For cached values, it can be found via
  64 * the current_config_kvi as above. During parsing, the current value can be
  65 * found in this variable. It's not part of "cf" because it transcends a single
  66 * file (i.e., a file included from .git/config is still in "repo" scope).
  67 */
  68static enum config_scope current_parsing_scope;
  69
  70static int core_compression_seen;
  71static int pack_compression_seen;
  72static int zlib_compression_seen;
  73
  74/*
  75 * Default config_set that contains key-value pairs from the usual set of config
  76 * config files (i.e repo specific .git/config, user wide ~/.gitconfig, XDG
  77 * config file and the global /etc/gitconfig)
  78 */
  79static struct config_set the_config_set;
  80
  81static int config_file_fgetc(struct config_source *conf)
  82{
  83        return getc_unlocked(conf->u.file);
  84}
  85
  86static int config_file_ungetc(int c, struct config_source *conf)
  87{
  88        return ungetc(c, conf->u.file);
  89}
  90
  91static long config_file_ftell(struct config_source *conf)
  92{
  93        return ftell(conf->u.file);
  94}
  95
  96
  97static int config_buf_fgetc(struct config_source *conf)
  98{
  99        if (conf->u.buf.pos < conf->u.buf.len)
 100                return conf->u.buf.buf[conf->u.buf.pos++];
 101
 102        return EOF;
 103}
 104
 105static int config_buf_ungetc(int c, struct config_source *conf)
 106{
 107        if (conf->u.buf.pos > 0) {
 108                conf->u.buf.pos--;
 109                if (conf->u.buf.buf[conf->u.buf.pos] != c)
 110                        die("BUG: config_buf can only ungetc the same character");
 111                return c;
 112        }
 113
 114        return EOF;
 115}
 116
 117static long config_buf_ftell(struct config_source *conf)
 118{
 119        return conf->u.buf.pos;
 120}
 121
 122#define MAX_INCLUDE_DEPTH 10
 123static const char include_depth_advice[] =
 124"exceeded maximum include depth (%d) while including\n"
 125"       %s\n"
 126"from\n"
 127"       %s\n"
 128"Do you have circular includes?";
 129static int handle_path_include(const char *path, struct config_include_data *inc)
 130{
 131        int ret = 0;
 132        struct strbuf buf = STRBUF_INIT;
 133        char *expanded;
 134
 135        if (!path)
 136                return config_error_nonbool("include.path");
 137
 138        expanded = expand_user_path(path);
 139        if (!expanded)
 140                return error("could not expand include path '%s'", path);
 141        path = expanded;
 142
 143        /*
 144         * Use an absolute path as-is, but interpret relative paths
 145         * based on the including config file.
 146         */
 147        if (!is_absolute_path(path)) {
 148                char *slash;
 149
 150                if (!cf || !cf->path)
 151                        return error("relative config includes must come from files");
 152
 153                slash = find_last_dir_sep(cf->path);
 154                if (slash)
 155                        strbuf_add(&buf, cf->path, slash - cf->path + 1);
 156                strbuf_addstr(&buf, path);
 157                path = buf.buf;
 158        }
 159
 160        if (!access_or_die(path, R_OK, 0)) {
 161                if (++inc->depth > MAX_INCLUDE_DEPTH)
 162                        die(include_depth_advice, MAX_INCLUDE_DEPTH, path,
 163                            !cf ? "<unknown>" :
 164                            cf->name ? cf->name :
 165                            "the command line");
 166                ret = git_config_from_file(git_config_include, path, inc);
 167                inc->depth--;
 168        }
 169        strbuf_release(&buf);
 170        free(expanded);
 171        return ret;
 172}
 173
 174static int prepare_include_condition_pattern(struct strbuf *pat)
 175{
 176        struct strbuf path = STRBUF_INIT;
 177        char *expanded;
 178        int prefix = 0;
 179
 180        expanded = expand_user_path(pat->buf);
 181        if (expanded) {
 182                strbuf_reset(pat);
 183                strbuf_addstr(pat, expanded);
 184                free(expanded);
 185        }
 186
 187        if (pat->buf[0] == '.' && is_dir_sep(pat->buf[1])) {
 188                const char *slash;
 189
 190                if (!cf || !cf->path)
 191                        return error(_("relative config include "
 192                                       "conditionals must come from files"));
 193
 194                strbuf_add_absolute_path(&path, cf->path);
 195                slash = find_last_dir_sep(path.buf);
 196                if (!slash)
 197                        die("BUG: how is this possible?");
 198                strbuf_splice(pat, 0, 1, path.buf, slash - path.buf);
 199                prefix = slash - path.buf + 1 /* slash */;
 200        } else if (!is_absolute_path(pat->buf))
 201                strbuf_insert(pat, 0, "**/", 3);
 202
 203        if (pat->len && is_dir_sep(pat->buf[pat->len - 1]))
 204                strbuf_addstr(pat, "**");
 205
 206        strbuf_release(&path);
 207        return prefix;
 208}
 209
 210static int include_by_gitdir(const char *cond, size_t cond_len, int icase)
 211{
 212        struct strbuf text = STRBUF_INIT;
 213        struct strbuf pattern = STRBUF_INIT;
 214        int ret = 0, prefix;
 215
 216        strbuf_add_absolute_path(&text, get_git_dir());
 217        strbuf_add(&pattern, cond, cond_len);
 218        prefix = prepare_include_condition_pattern(&pattern);
 219
 220        if (prefix < 0)
 221                goto done;
 222
 223        if (prefix > 0) {
 224                /*
 225                 * perform literal matching on the prefix part so that
 226                 * any wildcard character in it can't create side effects.
 227                 */
 228                if (text.len < prefix)
 229                        goto done;
 230                if (!icase && strncmp(pattern.buf, text.buf, prefix))
 231                        goto done;
 232                if (icase && strncasecmp(pattern.buf, text.buf, prefix))
 233                        goto done;
 234        }
 235
 236        ret = !wildmatch(pattern.buf + prefix, text.buf + prefix,
 237                         icase ? WM_CASEFOLD : 0, NULL);
 238
 239done:
 240        strbuf_release(&pattern);
 241        strbuf_release(&text);
 242        return ret;
 243}
 244
 245static int include_condition_is_true(const char *cond, size_t cond_len)
 246{
 247
 248        if (skip_prefix_mem(cond, cond_len, "gitdir:", &cond, &cond_len))
 249                return include_by_gitdir(cond, cond_len, 0);
 250        else if (skip_prefix_mem(cond, cond_len, "gitdir/i:", &cond, &cond_len))
 251                return include_by_gitdir(cond, cond_len, 1);
 252
 253        /* unknown conditionals are always false */
 254        return 0;
 255}
 256
 257int git_config_include(const char *var, const char *value, void *data)
 258{
 259        struct config_include_data *inc = data;
 260        const char *cond, *key;
 261        int cond_len;
 262        int ret;
 263
 264        /*
 265         * Pass along all values, including "include" directives; this makes it
 266         * possible to query information on the includes themselves.
 267         */
 268        ret = inc->fn(var, value, inc->data);
 269        if (ret < 0)
 270                return ret;
 271
 272        if (!strcmp(var, "include.path"))
 273                ret = handle_path_include(value, inc);
 274
 275        if (!parse_config_key(var, "includeif", &cond, &cond_len, &key) &&
 276            (cond && include_condition_is_true(cond, cond_len)) &&
 277            !strcmp(key, "path"))
 278                ret = handle_path_include(value, inc);
 279
 280        return ret;
 281}
 282
 283void git_config_push_parameter(const char *text)
 284{
 285        struct strbuf env = STRBUF_INIT;
 286        const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
 287        if (old && *old) {
 288                strbuf_addstr(&env, old);
 289                strbuf_addch(&env, ' ');
 290        }
 291        sq_quote_buf(&env, text);
 292        setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
 293        strbuf_release(&env);
 294}
 295
 296static inline int iskeychar(int c)
 297{
 298        return isalnum(c) || c == '-';
 299}
 300
 301/*
 302 * Auxiliary function to sanity-check and split the key into the section
 303 * identifier and variable name.
 304 *
 305 * Returns 0 on success, -1 when there is an invalid character in the key and
 306 * -2 if there is no section name in the key.
 307 *
 308 * store_key - pointer to char* which will hold a copy of the key with
 309 *             lowercase section and variable name
 310 * baselen - pointer to int which will hold the length of the
 311 *           section + subsection part, can be NULL
 312 */
 313static int git_config_parse_key_1(const char *key, char **store_key, int *baselen_, int quiet)
 314{
 315        int i, dot, baselen;
 316        const char *last_dot = strrchr(key, '.');
 317
 318        /*
 319         * Since "key" actually contains the section name and the real
 320         * key name separated by a dot, we have to know where the dot is.
 321         */
 322
 323        if (last_dot == NULL || last_dot == key) {
 324                if (!quiet)
 325                        error("key does not contain a section: %s", key);
 326                return -CONFIG_NO_SECTION_OR_NAME;
 327        }
 328
 329        if (!last_dot[1]) {
 330                if (!quiet)
 331                        error("key does not contain variable name: %s", key);
 332                return -CONFIG_NO_SECTION_OR_NAME;
 333        }
 334
 335        baselen = last_dot - key;
 336        if (baselen_)
 337                *baselen_ = baselen;
 338
 339        /*
 340         * Validate the key and while at it, lower case it for matching.
 341         */
 342        if (store_key)
 343                *store_key = xmallocz(strlen(key));
 344
 345        dot = 0;
 346        for (i = 0; key[i]; i++) {
 347                unsigned char c = key[i];
 348                if (c == '.')
 349                        dot = 1;
 350                /* Leave the extended basename untouched.. */
 351                if (!dot || i > baselen) {
 352                        if (!iskeychar(c) ||
 353                            (i == baselen + 1 && !isalpha(c))) {
 354                                if (!quiet)
 355                                        error("invalid key: %s", key);
 356                                goto out_free_ret_1;
 357                        }
 358                        c = tolower(c);
 359                } else if (c == '\n') {
 360                        if (!quiet)
 361                                error("invalid key (newline): %s", key);
 362                        goto out_free_ret_1;
 363                }
 364                if (store_key)
 365                        (*store_key)[i] = c;
 366        }
 367
 368        return 0;
 369
 370out_free_ret_1:
 371        if (store_key) {
 372                free(*store_key);
 373                *store_key = NULL;
 374        }
 375        return -CONFIG_INVALID_KEY;
 376}
 377
 378int git_config_parse_key(const char *key, char **store_key, int *baselen)
 379{
 380        return git_config_parse_key_1(key, store_key, baselen, 0);
 381}
 382
 383int git_config_key_is_valid(const char *key)
 384{
 385        return !git_config_parse_key_1(key, NULL, NULL, 1);
 386}
 387
 388int git_config_parse_parameter(const char *text,
 389                               config_fn_t fn, void *data)
 390{
 391        const char *value;
 392        char *canonical_name;
 393        struct strbuf **pair;
 394        int ret;
 395
 396        pair = strbuf_split_str(text, '=', 2);
 397        if (!pair[0])
 398                return error("bogus config parameter: %s", text);
 399
 400        if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=') {
 401                strbuf_setlen(pair[0], pair[0]->len - 1);
 402                value = pair[1] ? pair[1]->buf : "";
 403        } else {
 404                value = NULL;
 405        }
 406
 407        strbuf_trim(pair[0]);
 408        if (!pair[0]->len) {
 409                strbuf_list_free(pair);
 410                return error("bogus config parameter: %s", text);
 411        }
 412
 413        if (git_config_parse_key(pair[0]->buf, &canonical_name, NULL)) {
 414                ret = -1;
 415        } else {
 416                ret = (fn(canonical_name, value, data) < 0) ? -1 : 0;
 417                free(canonical_name);
 418        }
 419        strbuf_list_free(pair);
 420        return ret;
 421}
 422
 423int git_config_from_parameters(config_fn_t fn, void *data)
 424{
 425        const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
 426        int ret = 0;
 427        char *envw;
 428        const char **argv = NULL;
 429        int nr = 0, alloc = 0;
 430        int i;
 431        struct config_source source;
 432
 433        if (!env)
 434                return 0;
 435
 436        memset(&source, 0, sizeof(source));
 437        source.prev = cf;
 438        source.origin_type = CONFIG_ORIGIN_CMDLINE;
 439        cf = &source;
 440
 441        /* sq_dequote will write over it */
 442        envw = xstrdup(env);
 443
 444        if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
 445                ret = error("bogus format in " CONFIG_DATA_ENVIRONMENT);
 446                goto out;
 447        }
 448
 449        for (i = 0; i < nr; i++) {
 450                if (git_config_parse_parameter(argv[i], fn, data) < 0) {
 451                        ret = -1;
 452                        goto out;
 453                }
 454        }
 455
 456out:
 457        free(argv);
 458        free(envw);
 459        cf = source.prev;
 460        return ret;
 461}
 462
 463static int get_next_char(void)
 464{
 465        int c = cf->do_fgetc(cf);
 466
 467        if (c == '\r') {
 468                /* DOS like systems */
 469                c = cf->do_fgetc(cf);
 470                if (c != '\n') {
 471                        if (c != EOF)
 472                                cf->do_ungetc(c, cf);
 473                        c = '\r';
 474                }
 475        }
 476        if (c == '\n')
 477                cf->linenr++;
 478        if (c == EOF) {
 479                cf->eof = 1;
 480                cf->linenr++;
 481                c = '\n';
 482        }
 483        return c;
 484}
 485
 486static char *parse_value(void)
 487{
 488        int quote = 0, comment = 0, space = 0;
 489
 490        strbuf_reset(&cf->value);
 491        for (;;) {
 492                int c = get_next_char();
 493                if (c == '\n') {
 494                        if (quote) {
 495                                cf->linenr--;
 496                                return NULL;
 497                        }
 498                        return cf->value.buf;
 499                }
 500                if (comment)
 501                        continue;
 502                if (isspace(c) && !quote) {
 503                        if (cf->value.len)
 504                                space++;
 505                        continue;
 506                }
 507                if (!quote) {
 508                        if (c == ';' || c == '#') {
 509                                comment = 1;
 510                                continue;
 511                        }
 512                }
 513                for (; space; space--)
 514                        strbuf_addch(&cf->value, ' ');
 515                if (c == '\\') {
 516                        c = get_next_char();
 517                        switch (c) {
 518                        case '\n':
 519                                continue;
 520                        case 't':
 521                                c = '\t';
 522                                break;
 523                        case 'b':
 524                                c = '\b';
 525                                break;
 526                        case 'n':
 527                                c = '\n';
 528                                break;
 529                        /* Some characters escape as themselves */
 530                        case '\\': case '"':
 531                                break;
 532                        /* Reject unknown escape sequences */
 533                        default:
 534                                return NULL;
 535                        }
 536                        strbuf_addch(&cf->value, c);
 537                        continue;
 538                }
 539                if (c == '"') {
 540                        quote = 1-quote;
 541                        continue;
 542                }
 543                strbuf_addch(&cf->value, c);
 544        }
 545}
 546
 547static int get_value(config_fn_t fn, void *data, struct strbuf *name)
 548{
 549        int c;
 550        char *value;
 551        int ret;
 552
 553        /* Get the full name */
 554        for (;;) {
 555                c = get_next_char();
 556                if (cf->eof)
 557                        break;
 558                if (!iskeychar(c))
 559                        break;
 560                strbuf_addch(name, tolower(c));
 561        }
 562
 563        while (c == ' ' || c == '\t')
 564                c = get_next_char();
 565
 566        value = NULL;
 567        if (c != '\n') {
 568                if (c != '=')
 569                        return -1;
 570                value = parse_value();
 571                if (!value)
 572                        return -1;
 573        }
 574        /*
 575         * We already consumed the \n, but we need linenr to point to
 576         * the line we just parsed during the call to fn to get
 577         * accurate line number in error messages.
 578         */
 579        cf->linenr--;
 580        ret = fn(name->buf, value, data);
 581        cf->linenr++;
 582        return ret;
 583}
 584
 585static int get_extended_base_var(struct strbuf *name, int c)
 586{
 587        do {
 588                if (c == '\n')
 589                        goto error_incomplete_line;
 590                c = get_next_char();
 591        } while (isspace(c));
 592
 593        /* We require the format to be '[base "extension"]' */
 594        if (c != '"')
 595                return -1;
 596        strbuf_addch(name, '.');
 597
 598        for (;;) {
 599                int c = get_next_char();
 600                if (c == '\n')
 601                        goto error_incomplete_line;
 602                if (c == '"')
 603                        break;
 604                if (c == '\\') {
 605                        c = get_next_char();
 606                        if (c == '\n')
 607                                goto error_incomplete_line;
 608                }
 609                strbuf_addch(name, c);
 610        }
 611
 612        /* Final ']' */
 613        if (get_next_char() != ']')
 614                return -1;
 615        return 0;
 616error_incomplete_line:
 617        cf->linenr--;
 618        return -1;
 619}
 620
 621static int get_base_var(struct strbuf *name)
 622{
 623        for (;;) {
 624                int c = get_next_char();
 625                if (cf->eof)
 626                        return -1;
 627                if (c == ']')
 628                        return 0;
 629                if (isspace(c))
 630                        return get_extended_base_var(name, c);
 631                if (!iskeychar(c) && c != '.')
 632                        return -1;
 633                strbuf_addch(name, tolower(c));
 634        }
 635}
 636
 637static int git_parse_source(config_fn_t fn, void *data)
 638{
 639        int comment = 0;
 640        int baselen = 0;
 641        struct strbuf *var = &cf->var;
 642        int error_return = 0;
 643        char *error_msg = NULL;
 644
 645        /* U+FEFF Byte Order Mark in UTF8 */
 646        const char *bomptr = utf8_bom;
 647
 648        for (;;) {
 649                int c = get_next_char();
 650                if (bomptr && *bomptr) {
 651                        /* We are at the file beginning; skip UTF8-encoded BOM
 652                         * if present. Sane editors won't put this in on their
 653                         * own, but e.g. Windows Notepad will do it happily. */
 654                        if (c == (*bomptr & 0377)) {
 655                                bomptr++;
 656                                continue;
 657                        } else {
 658                                /* Do not tolerate partial BOM. */
 659                                if (bomptr != utf8_bom)
 660                                        break;
 661                                /* No BOM at file beginning. Cool. */
 662                                bomptr = NULL;
 663                        }
 664                }
 665                if (c == '\n') {
 666                        if (cf->eof)
 667                                return 0;
 668                        comment = 0;
 669                        continue;
 670                }
 671                if (comment || isspace(c))
 672                        continue;
 673                if (c == '#' || c == ';') {
 674                        comment = 1;
 675                        continue;
 676                }
 677                if (c == '[') {
 678                        /* Reset prior to determining a new stem */
 679                        strbuf_reset(var);
 680                        if (get_base_var(var) < 0 || var->len < 1)
 681                                break;
 682                        strbuf_addch(var, '.');
 683                        baselen = var->len;
 684                        continue;
 685                }
 686                if (!isalpha(c))
 687                        break;
 688                /*
 689                 * Truncate the var name back to the section header
 690                 * stem prior to grabbing the suffix part of the name
 691                 * and the value.
 692                 */
 693                strbuf_setlen(var, baselen);
 694                strbuf_addch(var, tolower(c));
 695                if (get_value(fn, data, var) < 0)
 696                        break;
 697        }
 698
 699        switch (cf->origin_type) {
 700        case CONFIG_ORIGIN_BLOB:
 701                error_msg = xstrfmt(_("bad config line %d in blob %s"),
 702                                      cf->linenr, cf->name);
 703                break;
 704        case CONFIG_ORIGIN_FILE:
 705                error_msg = xstrfmt(_("bad config line %d in file %s"),
 706                                      cf->linenr, cf->name);
 707                break;
 708        case CONFIG_ORIGIN_STDIN:
 709                error_msg = xstrfmt(_("bad config line %d in standard input"),
 710                                      cf->linenr);
 711                break;
 712        case CONFIG_ORIGIN_SUBMODULE_BLOB:
 713                error_msg = xstrfmt(_("bad config line %d in submodule-blob %s"),
 714                                       cf->linenr, cf->name);
 715                break;
 716        case CONFIG_ORIGIN_CMDLINE:
 717                error_msg = xstrfmt(_("bad config line %d in command line %s"),
 718                                       cf->linenr, cf->name);
 719                break;
 720        default:
 721                error_msg = xstrfmt(_("bad config line %d in %s"),
 722                                      cf->linenr, cf->name);
 723        }
 724
 725        if (cf->die_on_error)
 726                die("%s", error_msg);
 727        else
 728                error_return = error("%s", error_msg);
 729
 730        free(error_msg);
 731        return error_return;
 732}
 733
 734static int parse_unit_factor(const char *end, uintmax_t *val)
 735{
 736        if (!*end)
 737                return 1;
 738        else if (!strcasecmp(end, "k")) {
 739                *val *= 1024;
 740                return 1;
 741        }
 742        else if (!strcasecmp(end, "m")) {
 743                *val *= 1024 * 1024;
 744                return 1;
 745        }
 746        else if (!strcasecmp(end, "g")) {
 747                *val *= 1024 * 1024 * 1024;
 748                return 1;
 749        }
 750        return 0;
 751}
 752
 753static int git_parse_signed(const char *value, intmax_t *ret, intmax_t max)
 754{
 755        if (value && *value) {
 756                char *end;
 757                intmax_t val;
 758                uintmax_t uval;
 759                uintmax_t factor = 1;
 760
 761                errno = 0;
 762                val = strtoimax(value, &end, 0);
 763                if (errno == ERANGE)
 764                        return 0;
 765                if (!parse_unit_factor(end, &factor)) {
 766                        errno = EINVAL;
 767                        return 0;
 768                }
 769                uval = labs(val);
 770                uval *= factor;
 771                if (uval > max || labs(val) > uval) {
 772                        errno = ERANGE;
 773                        return 0;
 774                }
 775                val *= factor;
 776                *ret = val;
 777                return 1;
 778        }
 779        errno = EINVAL;
 780        return 0;
 781}
 782
 783static int git_parse_unsigned(const char *value, uintmax_t *ret, uintmax_t max)
 784{
 785        if (value && *value) {
 786                char *end;
 787                uintmax_t val;
 788                uintmax_t oldval;
 789
 790                errno = 0;
 791                val = strtoumax(value, &end, 0);
 792                if (errno == ERANGE)
 793                        return 0;
 794                oldval = val;
 795                if (!parse_unit_factor(end, &val)) {
 796                        errno = EINVAL;
 797                        return 0;
 798                }
 799                if (val > max || oldval > val) {
 800                        errno = ERANGE;
 801                        return 0;
 802                }
 803                *ret = val;
 804                return 1;
 805        }
 806        errno = EINVAL;
 807        return 0;
 808}
 809
 810static int git_parse_int(const char *value, int *ret)
 811{
 812        intmax_t tmp;
 813        if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int)))
 814                return 0;
 815        *ret = tmp;
 816        return 1;
 817}
 818
 819static int git_parse_int64(const char *value, int64_t *ret)
 820{
 821        intmax_t tmp;
 822        if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int64_t)))
 823                return 0;
 824        *ret = tmp;
 825        return 1;
 826}
 827
 828int git_parse_ulong(const char *value, unsigned long *ret)
 829{
 830        uintmax_t tmp;
 831        if (!git_parse_unsigned(value, &tmp, maximum_unsigned_value_of_type(long)))
 832                return 0;
 833        *ret = tmp;
 834        return 1;
 835}
 836
 837NORETURN
 838static void die_bad_number(const char *name, const char *value)
 839{
 840        const char * error_type = (errno == ERANGE)? _("out of range"):_("invalid unit");
 841
 842        if (!value)
 843                value = "";
 844
 845        if (!(cf && cf->name))
 846                die(_("bad numeric config value '%s' for '%s': %s"),
 847                    value, name, error_type);
 848
 849        switch (cf->origin_type) {
 850        case CONFIG_ORIGIN_BLOB:
 851                die(_("bad numeric config value '%s' for '%s' in blob %s: %s"),
 852                    value, name, cf->name, error_type);
 853        case CONFIG_ORIGIN_FILE:
 854                die(_("bad numeric config value '%s' for '%s' in file %s: %s"),
 855                    value, name, cf->name, error_type);
 856        case CONFIG_ORIGIN_STDIN:
 857                die(_("bad numeric config value '%s' for '%s' in standard input: %s"),
 858                    value, name, error_type);
 859        case CONFIG_ORIGIN_SUBMODULE_BLOB:
 860                die(_("bad numeric config value '%s' for '%s' in submodule-blob %s: %s"),
 861                    value, name, cf->name, error_type);
 862        case CONFIG_ORIGIN_CMDLINE:
 863                die(_("bad numeric config value '%s' for '%s' in command line %s: %s"),
 864                    value, name, cf->name, error_type);
 865        default:
 866                die(_("bad numeric config value '%s' for '%s' in %s: %s"),
 867                    value, name, cf->name, error_type);
 868        }
 869}
 870
 871int git_config_int(const char *name, const char *value)
 872{
 873        int ret;
 874        if (!git_parse_int(value, &ret))
 875                die_bad_number(name, value);
 876        return ret;
 877}
 878
 879int64_t git_config_int64(const char *name, const char *value)
 880{
 881        int64_t ret;
 882        if (!git_parse_int64(value, &ret))
 883                die_bad_number(name, value);
 884        return ret;
 885}
 886
 887unsigned long git_config_ulong(const char *name, const char *value)
 888{
 889        unsigned long ret;
 890        if (!git_parse_ulong(value, &ret))
 891                die_bad_number(name, value);
 892        return ret;
 893}
 894
 895int git_parse_maybe_bool(const char *value)
 896{
 897        if (!value)
 898                return 1;
 899        if (!*value)
 900                return 0;
 901        if (!strcasecmp(value, "true")
 902            || !strcasecmp(value, "yes")
 903            || !strcasecmp(value, "on"))
 904                return 1;
 905        if (!strcasecmp(value, "false")
 906            || !strcasecmp(value, "no")
 907            || !strcasecmp(value, "off"))
 908                return 0;
 909        return -1;
 910}
 911
 912int git_config_maybe_bool(const char *name, const char *value)
 913{
 914        int v = git_parse_maybe_bool(value);
 915        if (0 <= v)
 916                return v;
 917        if (git_parse_int(value, &v))
 918                return !!v;
 919        return -1;
 920}
 921
 922int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 923{
 924        int v = git_parse_maybe_bool(value);
 925        if (0 <= v) {
 926                *is_bool = 1;
 927                return v;
 928        }
 929        *is_bool = 0;
 930        return git_config_int(name, value);
 931}
 932
 933int git_config_bool(const char *name, const char *value)
 934{
 935        int discard;
 936        return !!git_config_bool_or_int(name, value, &discard);
 937}
 938
 939int git_config_string(const char **dest, const char *var, const char *value)
 940{
 941        if (!value)
 942                return config_error_nonbool(var);
 943        *dest = xstrdup(value);
 944        return 0;
 945}
 946
 947int git_config_pathname(const char **dest, const char *var, const char *value)
 948{
 949        if (!value)
 950                return config_error_nonbool(var);
 951        *dest = expand_user_path(value);
 952        if (!*dest)
 953                die(_("failed to expand user dir in: '%s'"), value);
 954        return 0;
 955}
 956
 957static int git_default_core_config(const char *var, const char *value)
 958{
 959        /* This needs a better name */
 960        if (!strcmp(var, "core.filemode")) {
 961                trust_executable_bit = git_config_bool(var, value);
 962                return 0;
 963        }
 964        if (!strcmp(var, "core.trustctime")) {
 965                trust_ctime = git_config_bool(var, value);
 966                return 0;
 967        }
 968        if (!strcmp(var, "core.checkstat")) {
 969                if (!strcasecmp(value, "default"))
 970                        check_stat = 1;
 971                else if (!strcasecmp(value, "minimal"))
 972                        check_stat = 0;
 973        }
 974
 975        if (!strcmp(var, "core.quotepath")) {
 976                quote_path_fully = git_config_bool(var, value);
 977                return 0;
 978        }
 979
 980        if (!strcmp(var, "core.symlinks")) {
 981                has_symlinks = git_config_bool(var, value);
 982                return 0;
 983        }
 984
 985        if (!strcmp(var, "core.ignorecase")) {
 986                ignore_case = git_config_bool(var, value);
 987                return 0;
 988        }
 989
 990        if (!strcmp(var, "core.attributesfile"))
 991                return git_config_pathname(&git_attributes_file, var, value);
 992
 993        if (!strcmp(var, "core.hookspath"))
 994                return git_config_pathname(&git_hooks_path, var, value);
 995
 996        if (!strcmp(var, "core.bare")) {
 997                is_bare_repository_cfg = git_config_bool(var, value);
 998                return 0;
 999        }
1000
1001        if (!strcmp(var, "core.ignorestat")) {
1002                assume_unchanged = git_config_bool(var, value);
1003                return 0;
1004        }
1005
1006        if (!strcmp(var, "core.prefersymlinkrefs")) {
1007                prefer_symlink_refs = git_config_bool(var, value);
1008                return 0;
1009        }
1010
1011        if (!strcmp(var, "core.logallrefupdates")) {
1012                if (value && !strcasecmp(value, "always"))
1013                        log_all_ref_updates = LOG_REFS_ALWAYS;
1014                else if (git_config_bool(var, value))
1015                        log_all_ref_updates = LOG_REFS_NORMAL;
1016                else
1017                        log_all_ref_updates = LOG_REFS_NONE;
1018                return 0;
1019        }
1020
1021        if (!strcmp(var, "core.warnambiguousrefs")) {
1022                warn_ambiguous_refs = git_config_bool(var, value);
1023                return 0;
1024        }
1025
1026        if (!strcmp(var, "core.abbrev")) {
1027                if (!value)
1028                        return config_error_nonbool(var);
1029                if (!strcasecmp(value, "auto"))
1030                        default_abbrev = -1;
1031                else {
1032                        int abbrev = git_config_int(var, value);
1033                        if (abbrev < minimum_abbrev || abbrev > 40)
1034                                return error("abbrev length out of range: %d", abbrev);
1035                        default_abbrev = abbrev;
1036                }
1037                return 0;
1038        }
1039
1040        if (!strcmp(var, "core.disambiguate"))
1041                return set_disambiguate_hint_config(var, value);
1042
1043        if (!strcmp(var, "core.loosecompression")) {
1044                int level = git_config_int(var, value);
1045                if (level == -1)
1046                        level = Z_DEFAULT_COMPRESSION;
1047                else if (level < 0 || level > Z_BEST_COMPRESSION)
1048                        die(_("bad zlib compression level %d"), level);
1049                zlib_compression_level = level;
1050                zlib_compression_seen = 1;
1051                return 0;
1052        }
1053
1054        if (!strcmp(var, "core.compression")) {
1055                int level = git_config_int(var, value);
1056                if (level == -1)
1057                        level = Z_DEFAULT_COMPRESSION;
1058                else if (level < 0 || level > Z_BEST_COMPRESSION)
1059                        die(_("bad zlib compression level %d"), level);
1060                core_compression_level = level;
1061                core_compression_seen = 1;
1062                if (!zlib_compression_seen)
1063                        zlib_compression_level = level;
1064                if (!pack_compression_seen)
1065                        pack_compression_level = level;
1066                return 0;
1067        }
1068
1069        if (!strcmp(var, "core.packedgitwindowsize")) {
1070                int pgsz_x2 = getpagesize() * 2;
1071                packed_git_window_size = git_config_ulong(var, value);
1072
1073                /* This value must be multiple of (pagesize * 2) */
1074                packed_git_window_size /= pgsz_x2;
1075                if (packed_git_window_size < 1)
1076                        packed_git_window_size = 1;
1077                packed_git_window_size *= pgsz_x2;
1078                return 0;
1079        }
1080
1081        if (!strcmp(var, "core.bigfilethreshold")) {
1082                big_file_threshold = git_config_ulong(var, value);
1083                return 0;
1084        }
1085
1086        if (!strcmp(var, "core.packedgitlimit")) {
1087                packed_git_limit = git_config_ulong(var, value);
1088                return 0;
1089        }
1090
1091        if (!strcmp(var, "core.deltabasecachelimit")) {
1092                delta_base_cache_limit = git_config_ulong(var, value);
1093                return 0;
1094        }
1095
1096        if (!strcmp(var, "core.autocrlf")) {
1097                if (value && !strcasecmp(value, "input")) {
1098                        auto_crlf = AUTO_CRLF_INPUT;
1099                        return 0;
1100                }
1101                auto_crlf = git_config_bool(var, value);
1102                return 0;
1103        }
1104
1105        if (!strcmp(var, "core.safecrlf")) {
1106                if (value && !strcasecmp(value, "warn")) {
1107                        safe_crlf = SAFE_CRLF_WARN;
1108                        return 0;
1109                }
1110                safe_crlf = git_config_bool(var, value);
1111                return 0;
1112        }
1113
1114        if (!strcmp(var, "core.eol")) {
1115                if (value && !strcasecmp(value, "lf"))
1116                        core_eol = EOL_LF;
1117                else if (value && !strcasecmp(value, "crlf"))
1118                        core_eol = EOL_CRLF;
1119                else if (value && !strcasecmp(value, "native"))
1120                        core_eol = EOL_NATIVE;
1121                else
1122                        core_eol = EOL_UNSET;
1123                return 0;
1124        }
1125
1126        if (!strcmp(var, "core.notesref")) {
1127                notes_ref_name = xstrdup(value);
1128                return 0;
1129        }
1130
1131        if (!strcmp(var, "core.editor"))
1132                return git_config_string(&editor_program, var, value);
1133
1134        if (!strcmp(var, "core.commentchar")) {
1135                if (!value)
1136                        return config_error_nonbool(var);
1137                else if (!strcasecmp(value, "auto"))
1138                        auto_comment_line_char = 1;
1139                else if (value[0] && !value[1]) {
1140                        comment_line_char = value[0];
1141                        auto_comment_line_char = 0;
1142                } else
1143                        return error("core.commentChar should only be one character");
1144                return 0;
1145        }
1146
1147        if (!strcmp(var, "core.askpass"))
1148                return git_config_string(&askpass_program, var, value);
1149
1150        if (!strcmp(var, "core.excludesfile"))
1151                return git_config_pathname(&excludes_file, var, value);
1152
1153        if (!strcmp(var, "core.whitespace")) {
1154                if (!value)
1155                        return config_error_nonbool(var);
1156                whitespace_rule_cfg = parse_whitespace_rule(value);
1157                return 0;
1158        }
1159
1160        if (!strcmp(var, "core.fsyncobjectfiles")) {
1161                fsync_object_files = git_config_bool(var, value);
1162                return 0;
1163        }
1164
1165        if (!strcmp(var, "core.preloadindex")) {
1166                core_preload_index = git_config_bool(var, value);
1167                return 0;
1168        }
1169
1170        if (!strcmp(var, "core.createobject")) {
1171                if (!strcmp(value, "rename"))
1172                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
1173                else if (!strcmp(value, "link"))
1174                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
1175                else
1176                        die(_("invalid mode for object creation: %s"), value);
1177                return 0;
1178        }
1179
1180        if (!strcmp(var, "core.sparsecheckout")) {
1181                core_apply_sparse_checkout = git_config_bool(var, value);
1182                return 0;
1183        }
1184
1185        if (!strcmp(var, "core.precomposeunicode")) {
1186                precomposed_unicode = git_config_bool(var, value);
1187                return 0;
1188        }
1189
1190        if (!strcmp(var, "core.protecthfs")) {
1191                protect_hfs = git_config_bool(var, value);
1192                return 0;
1193        }
1194
1195        if (!strcmp(var, "core.protectntfs")) {
1196                protect_ntfs = git_config_bool(var, value);
1197                return 0;
1198        }
1199
1200        if (!strcmp(var, "core.hidedotfiles")) {
1201                if (value && !strcasecmp(value, "dotgitonly"))
1202                        hide_dotfiles = HIDE_DOTFILES_DOTGITONLY;
1203                else
1204                        hide_dotfiles = git_config_bool(var, value);
1205                return 0;
1206        }
1207
1208        /* Add other config variables here and to Documentation/config.txt. */
1209        return 0;
1210}
1211
1212static int git_default_i18n_config(const char *var, const char *value)
1213{
1214        if (!strcmp(var, "i18n.commitencoding"))
1215                return git_config_string(&git_commit_encoding, var, value);
1216
1217        if (!strcmp(var, "i18n.logoutputencoding"))
1218                return git_config_string(&git_log_output_encoding, var, value);
1219
1220        /* Add other config variables here and to Documentation/config.txt. */
1221        return 0;
1222}
1223
1224static int git_default_branch_config(const char *var, const char *value)
1225{
1226        if (!strcmp(var, "branch.autosetupmerge")) {
1227                if (value && !strcasecmp(value, "always")) {
1228                        git_branch_track = BRANCH_TRACK_ALWAYS;
1229                        return 0;
1230                }
1231                git_branch_track = git_config_bool(var, value);
1232                return 0;
1233        }
1234        if (!strcmp(var, "branch.autosetuprebase")) {
1235                if (!value)
1236                        return config_error_nonbool(var);
1237                else if (!strcmp(value, "never"))
1238                        autorebase = AUTOREBASE_NEVER;
1239                else if (!strcmp(value, "local"))
1240                        autorebase = AUTOREBASE_LOCAL;
1241                else if (!strcmp(value, "remote"))
1242                        autorebase = AUTOREBASE_REMOTE;
1243                else if (!strcmp(value, "always"))
1244                        autorebase = AUTOREBASE_ALWAYS;
1245                else
1246                        return error("malformed value for %s", var);
1247                return 0;
1248        }
1249
1250        /* Add other config variables here and to Documentation/config.txt. */
1251        return 0;
1252}
1253
1254static int git_default_push_config(const char *var, const char *value)
1255{
1256        if (!strcmp(var, "push.default")) {
1257                if (!value)
1258                        return config_error_nonbool(var);
1259                else if (!strcmp(value, "nothing"))
1260                        push_default = PUSH_DEFAULT_NOTHING;
1261                else if (!strcmp(value, "matching"))
1262                        push_default = PUSH_DEFAULT_MATCHING;
1263                else if (!strcmp(value, "simple"))
1264                        push_default = PUSH_DEFAULT_SIMPLE;
1265                else if (!strcmp(value, "upstream"))
1266                        push_default = PUSH_DEFAULT_UPSTREAM;
1267                else if (!strcmp(value, "tracking")) /* deprecated */
1268                        push_default = PUSH_DEFAULT_UPSTREAM;
1269                else if (!strcmp(value, "current"))
1270                        push_default = PUSH_DEFAULT_CURRENT;
1271                else {
1272                        error("malformed value for %s: %s", var, value);
1273                        return error("Must be one of nothing, matching, simple, "
1274                                     "upstream or current.");
1275                }
1276                return 0;
1277        }
1278
1279        /* Add other config variables here and to Documentation/config.txt. */
1280        return 0;
1281}
1282
1283static int git_default_mailmap_config(const char *var, const char *value)
1284{
1285        if (!strcmp(var, "mailmap.file"))
1286                return git_config_pathname(&git_mailmap_file, var, value);
1287        if (!strcmp(var, "mailmap.blob"))
1288                return git_config_string(&git_mailmap_blob, var, value);
1289
1290        /* Add other config variables here and to Documentation/config.txt. */
1291        return 0;
1292}
1293
1294int git_default_config(const char *var, const char *value, void *dummy)
1295{
1296        if (starts_with(var, "core."))
1297                return git_default_core_config(var, value);
1298
1299        if (starts_with(var, "user."))
1300                return git_ident_config(var, value, dummy);
1301
1302        if (starts_with(var, "i18n."))
1303                return git_default_i18n_config(var, value);
1304
1305        if (starts_with(var, "branch."))
1306                return git_default_branch_config(var, value);
1307
1308        if (starts_with(var, "push."))
1309                return git_default_push_config(var, value);
1310
1311        if (starts_with(var, "mailmap."))
1312                return git_default_mailmap_config(var, value);
1313
1314        if (starts_with(var, "advice."))
1315                return git_default_advice_config(var, value);
1316
1317        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
1318                pager_use_color = git_config_bool(var,value);
1319                return 0;
1320        }
1321
1322        if (!strcmp(var, "pack.packsizelimit")) {
1323                pack_size_limit_cfg = git_config_ulong(var, value);
1324                return 0;
1325        }
1326
1327        if (!strcmp(var, "pack.compression")) {
1328                int level = git_config_int(var, value);
1329                if (level == -1)
1330                        level = Z_DEFAULT_COMPRESSION;
1331                else if (level < 0 || level > Z_BEST_COMPRESSION)
1332                        die(_("bad pack compression level %d"), level);
1333                pack_compression_level = level;
1334                pack_compression_seen = 1;
1335                return 0;
1336        }
1337
1338        /* Add other config variables here and to Documentation/config.txt. */
1339        return 0;
1340}
1341
1342/*
1343 * All source specific fields in the union, die_on_error, name and the callbacks
1344 * fgetc, ungetc, ftell of top need to be initialized before calling
1345 * this function.
1346 */
1347static int do_config_from(struct config_source *top, config_fn_t fn, void *data)
1348{
1349        int ret;
1350
1351        /* push config-file parsing state stack */
1352        top->prev = cf;
1353        top->linenr = 1;
1354        top->eof = 0;
1355        strbuf_init(&top->value, 1024);
1356        strbuf_init(&top->var, 1024);
1357        cf = top;
1358
1359        ret = git_parse_source(fn, data);
1360
1361        /* pop config-file parsing state stack */
1362        strbuf_release(&top->value);
1363        strbuf_release(&top->var);
1364        cf = top->prev;
1365
1366        return ret;
1367}
1368
1369static int do_config_from_file(config_fn_t fn,
1370                const enum config_origin_type origin_type,
1371                const char *name, const char *path, FILE *f,
1372                void *data)
1373{
1374        struct config_source top;
1375
1376        top.u.file = f;
1377        top.origin_type = origin_type;
1378        top.name = name;
1379        top.path = path;
1380        top.die_on_error = 1;
1381        top.do_fgetc = config_file_fgetc;
1382        top.do_ungetc = config_file_ungetc;
1383        top.do_ftell = config_file_ftell;
1384
1385        return do_config_from(&top, fn, data);
1386}
1387
1388static int git_config_from_stdin(config_fn_t fn, void *data)
1389{
1390        return do_config_from_file(fn, CONFIG_ORIGIN_STDIN, "", NULL, stdin, data);
1391}
1392
1393int git_config_from_file(config_fn_t fn, const char *filename, void *data)
1394{
1395        int ret = -1;
1396        FILE *f;
1397
1398        f = fopen(filename, "r");
1399        if (f) {
1400                flockfile(f);
1401                ret = do_config_from_file(fn, CONFIG_ORIGIN_FILE, filename, filename, f, data);
1402                funlockfile(f);
1403                fclose(f);
1404        }
1405        return ret;
1406}
1407
1408int git_config_from_mem(config_fn_t fn, const enum config_origin_type origin_type,
1409                        const char *name, const char *buf, size_t len, void *data)
1410{
1411        struct config_source top;
1412
1413        top.u.buf.buf = buf;
1414        top.u.buf.len = len;
1415        top.u.buf.pos = 0;
1416        top.origin_type = origin_type;
1417        top.name = name;
1418        top.path = NULL;
1419        top.die_on_error = 0;
1420        top.do_fgetc = config_buf_fgetc;
1421        top.do_ungetc = config_buf_ungetc;
1422        top.do_ftell = config_buf_ftell;
1423
1424        return do_config_from(&top, fn, data);
1425}
1426
1427int git_config_from_blob_sha1(config_fn_t fn,
1428                              const char *name,
1429                              const unsigned char *sha1,
1430                              void *data)
1431{
1432        enum object_type type;
1433        char *buf;
1434        unsigned long size;
1435        int ret;
1436
1437        buf = read_sha1_file(sha1, &type, &size);
1438        if (!buf)
1439                return error("unable to load config blob object '%s'", name);
1440        if (type != OBJ_BLOB) {
1441                free(buf);
1442                return error("reference '%s' does not point to a blob", name);
1443        }
1444
1445        ret = git_config_from_mem(fn, CONFIG_ORIGIN_BLOB, name, buf, size, data);
1446        free(buf);
1447
1448        return ret;
1449}
1450
1451static int git_config_from_blob_ref(config_fn_t fn,
1452                                    const char *name,
1453                                    void *data)
1454{
1455        unsigned char sha1[20];
1456
1457        if (get_sha1(name, sha1) < 0)
1458                return error("unable to resolve config blob '%s'", name);
1459        return git_config_from_blob_sha1(fn, name, sha1, data);
1460}
1461
1462const char *git_etc_gitconfig(void)
1463{
1464        static const char *system_wide;
1465        if (!system_wide)
1466                system_wide = system_path(ETC_GITCONFIG);
1467        return system_wide;
1468}
1469
1470/*
1471 * Parse environment variable 'k' as a boolean (in various
1472 * possible spellings); if missing, use the default value 'def'.
1473 */
1474int git_env_bool(const char *k, int def)
1475{
1476        const char *v = getenv(k);
1477        return v ? git_config_bool(k, v) : def;
1478}
1479
1480/*
1481 * Parse environment variable 'k' as ulong with possibly a unit
1482 * suffix; if missing, use the default value 'val'.
1483 */
1484unsigned long git_env_ulong(const char *k, unsigned long val)
1485{
1486        const char *v = getenv(k);
1487        if (v && !git_parse_ulong(v, &val))
1488                die("failed to parse %s", k);
1489        return val;
1490}
1491
1492int git_config_system(void)
1493{
1494        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
1495}
1496
1497static int do_git_config_sequence(config_fn_t fn, void *data)
1498{
1499        int ret = 0;
1500        char *xdg_config = xdg_config_home("config");
1501        char *user_config = expand_user_path("~/.gitconfig");
1502        char *repo_config = have_git_dir() ? git_pathdup("config") : NULL;
1503
1504        current_parsing_scope = CONFIG_SCOPE_SYSTEM;
1505        if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK, 0))
1506                ret += git_config_from_file(fn, git_etc_gitconfig(),
1507                                            data);
1508
1509        current_parsing_scope = CONFIG_SCOPE_GLOBAL;
1510        if (xdg_config && !access_or_die(xdg_config, R_OK, ACCESS_EACCES_OK))
1511                ret += git_config_from_file(fn, xdg_config, data);
1512
1513        if (user_config && !access_or_die(user_config, R_OK, ACCESS_EACCES_OK))
1514                ret += git_config_from_file(fn, user_config, data);
1515
1516        current_parsing_scope = CONFIG_SCOPE_REPO;
1517        if (repo_config && !access_or_die(repo_config, R_OK, 0))
1518                ret += git_config_from_file(fn, repo_config, data);
1519
1520        current_parsing_scope = CONFIG_SCOPE_CMDLINE;
1521        if (git_config_from_parameters(fn, data) < 0)
1522                die(_("unable to parse command-line config"));
1523
1524        current_parsing_scope = CONFIG_SCOPE_UNKNOWN;
1525        free(xdg_config);
1526        free(user_config);
1527        free(repo_config);
1528        return ret;
1529}
1530
1531int git_config_with_options(config_fn_t fn, void *data,
1532                            struct git_config_source *config_source,
1533                            int respect_includes)
1534{
1535        struct config_include_data inc = CONFIG_INCLUDE_INIT;
1536
1537        if (respect_includes) {
1538                inc.fn = fn;
1539                inc.data = data;
1540                fn = git_config_include;
1541                data = &inc;
1542        }
1543
1544        /*
1545         * If we have a specific filename, use it. Otherwise, follow the
1546         * regular lookup sequence.
1547         */
1548        if (config_source && config_source->use_stdin)
1549                return git_config_from_stdin(fn, data);
1550        else if (config_source && config_source->file)
1551                return git_config_from_file(fn, config_source->file, data);
1552        else if (config_source && config_source->blob)
1553                return git_config_from_blob_ref(fn, config_source->blob, data);
1554
1555        return do_git_config_sequence(fn, data);
1556}
1557
1558static void git_config_raw(config_fn_t fn, void *data)
1559{
1560        if (git_config_with_options(fn, data, NULL, 1) < 0)
1561                /*
1562                 * git_config_with_options() normally returns only
1563                 * zero, as most errors are fatal, and
1564                 * non-fatal potential errors are guarded by "if"
1565                 * statements that are entered only when no error is
1566                 * possible.
1567                 *
1568                 * If we ever encounter a non-fatal error, it means
1569                 * something went really wrong and we should stop
1570                 * immediately.
1571                 */
1572                die(_("unknown error occurred while reading the configuration files"));
1573}
1574
1575static void configset_iter(struct config_set *cs, config_fn_t fn, void *data)
1576{
1577        int i, value_index;
1578        struct string_list *values;
1579        struct config_set_element *entry;
1580        struct configset_list *list = &cs->list;
1581
1582        for (i = 0; i < list->nr; i++) {
1583                entry = list->items[i].e;
1584                value_index = list->items[i].value_index;
1585                values = &entry->value_list;
1586
1587                current_config_kvi = values->items[value_index].util;
1588
1589                if (fn(entry->key, values->items[value_index].string, data) < 0)
1590                        git_die_config_linenr(entry->key,
1591                                              current_config_kvi->filename,
1592                                              current_config_kvi->linenr);
1593
1594                current_config_kvi = NULL;
1595        }
1596}
1597
1598void read_early_config(config_fn_t cb, void *data)
1599{
1600        struct strbuf buf = STRBUF_INIT;
1601
1602        git_config_with_options(cb, data, NULL, 1);
1603
1604        /*
1605         * When setup_git_directory() was not yet asked to discover the
1606         * GIT_DIR, we ask discover_git_directory() to figure out whether there
1607         * is any repository config we should use (but unlike
1608         * setup_git_directory_gently(), no global state is changed, most
1609         * notably, the current working directory is still the same after the
1610         * call).
1611         */
1612        if (!have_git_dir() && discover_git_directory(&buf)) {
1613                struct git_config_source repo_config;
1614
1615                memset(&repo_config, 0, sizeof(repo_config));
1616                strbuf_addstr(&buf, "/config");
1617                repo_config.file = buf.buf;
1618                git_config_with_options(cb, data, &repo_config, 1);
1619        }
1620        strbuf_release(&buf);
1621}
1622
1623static void git_config_check_init(void);
1624
1625void git_config(config_fn_t fn, void *data)
1626{
1627        git_config_check_init();
1628        configset_iter(&the_config_set, fn, data);
1629}
1630
1631static struct config_set_element *configset_find_element(struct config_set *cs, const char *key)
1632{
1633        struct config_set_element k;
1634        struct config_set_element *found_entry;
1635        char *normalized_key;
1636        /*
1637         * `key` may come from the user, so normalize it before using it
1638         * for querying entries from the hashmap.
1639         */
1640        if (git_config_parse_key(key, &normalized_key, NULL))
1641                return NULL;
1642
1643        hashmap_entry_init(&k, strhash(normalized_key));
1644        k.key = normalized_key;
1645        found_entry = hashmap_get(&cs->config_hash, &k, NULL);
1646        free(normalized_key);
1647        return found_entry;
1648}
1649
1650static int configset_add_value(struct config_set *cs, const char *key, const char *value)
1651{
1652        struct config_set_element *e;
1653        struct string_list_item *si;
1654        struct configset_list_item *l_item;
1655        struct key_value_info *kv_info = xmalloc(sizeof(*kv_info));
1656
1657        e = configset_find_element(cs, key);
1658        /*
1659         * Since the keys are being fed by git_config*() callback mechanism, they
1660         * are already normalized. So simply add them without any further munging.
1661         */
1662        if (!e) {
1663                e = xmalloc(sizeof(*e));
1664                hashmap_entry_init(e, strhash(key));
1665                e->key = xstrdup(key);
1666                string_list_init(&e->value_list, 1);
1667                hashmap_add(&cs->config_hash, e);
1668        }
1669        si = string_list_append_nodup(&e->value_list, xstrdup_or_null(value));
1670
1671        ALLOC_GROW(cs->list.items, cs->list.nr + 1, cs->list.alloc);
1672        l_item = &cs->list.items[cs->list.nr++];
1673        l_item->e = e;
1674        l_item->value_index = e->value_list.nr - 1;
1675
1676        if (!cf)
1677                die("BUG: configset_add_value has no source");
1678        if (cf->name) {
1679                kv_info->filename = strintern(cf->name);
1680                kv_info->linenr = cf->linenr;
1681                kv_info->origin_type = cf->origin_type;
1682        } else {
1683                /* for values read from `git_config_from_parameters()` */
1684                kv_info->filename = NULL;
1685                kv_info->linenr = -1;
1686                kv_info->origin_type = CONFIG_ORIGIN_CMDLINE;
1687        }
1688        kv_info->scope = current_parsing_scope;
1689        si->util = kv_info;
1690
1691        return 0;
1692}
1693
1694static int config_set_element_cmp(const struct config_set_element *e1,
1695                                 const struct config_set_element *e2, const void *unused)
1696{
1697        return strcmp(e1->key, e2->key);
1698}
1699
1700void git_configset_init(struct config_set *cs)
1701{
1702        hashmap_init(&cs->config_hash, (hashmap_cmp_fn)config_set_element_cmp, 0);
1703        cs->hash_initialized = 1;
1704        cs->list.nr = 0;
1705        cs->list.alloc = 0;
1706        cs->list.items = NULL;
1707}
1708
1709void git_configset_clear(struct config_set *cs)
1710{
1711        struct config_set_element *entry;
1712        struct hashmap_iter iter;
1713        if (!cs->hash_initialized)
1714                return;
1715
1716        hashmap_iter_init(&cs->config_hash, &iter);
1717        while ((entry = hashmap_iter_next(&iter))) {
1718                free(entry->key);
1719                string_list_clear(&entry->value_list, 1);
1720        }
1721        hashmap_free(&cs->config_hash, 1);
1722        cs->hash_initialized = 0;
1723        free(cs->list.items);
1724        cs->list.nr = 0;
1725        cs->list.alloc = 0;
1726        cs->list.items = NULL;
1727}
1728
1729static int config_set_callback(const char *key, const char *value, void *cb)
1730{
1731        struct config_set *cs = cb;
1732        configset_add_value(cs, key, value);
1733        return 0;
1734}
1735
1736int git_configset_add_file(struct config_set *cs, const char *filename)
1737{
1738        return git_config_from_file(config_set_callback, filename, cs);
1739}
1740
1741int git_configset_get_value(struct config_set *cs, const char *key, const char **value)
1742{
1743        const struct string_list *values = NULL;
1744        /*
1745         * Follows "last one wins" semantic, i.e., if there are multiple matches for the
1746         * queried key in the files of the configset, the value returned will be the last
1747         * value in the value list for that key.
1748         */
1749        values = git_configset_get_value_multi(cs, key);
1750
1751        if (!values)
1752                return 1;
1753        assert(values->nr > 0);
1754        *value = values->items[values->nr - 1].string;
1755        return 0;
1756}
1757
1758const struct string_list *git_configset_get_value_multi(struct config_set *cs, const char *key)
1759{
1760        struct config_set_element *e = configset_find_element(cs, key);
1761        return e ? &e->value_list : NULL;
1762}
1763
1764int git_configset_get_string_const(struct config_set *cs, const char *key, const char **dest)
1765{
1766        const char *value;
1767        if (!git_configset_get_value(cs, key, &value))
1768                return git_config_string(dest, key, value);
1769        else
1770                return 1;
1771}
1772
1773int git_configset_get_string(struct config_set *cs, const char *key, char **dest)
1774{
1775        return git_configset_get_string_const(cs, key, (const char **)dest);
1776}
1777
1778int git_configset_get_int(struct config_set *cs, const char *key, int *dest)
1779{
1780        const char *value;
1781        if (!git_configset_get_value(cs, key, &value)) {
1782                *dest = git_config_int(key, value);
1783                return 0;
1784        } else
1785                return 1;
1786}
1787
1788int git_configset_get_ulong(struct config_set *cs, const char *key, unsigned long *dest)
1789{
1790        const char *value;
1791        if (!git_configset_get_value(cs, key, &value)) {
1792                *dest = git_config_ulong(key, value);
1793                return 0;
1794        } else
1795                return 1;
1796}
1797
1798int git_configset_get_bool(struct config_set *cs, const char *key, int *dest)
1799{
1800        const char *value;
1801        if (!git_configset_get_value(cs, key, &value)) {
1802                *dest = git_config_bool(key, value);
1803                return 0;
1804        } else
1805                return 1;
1806}
1807
1808int git_configset_get_bool_or_int(struct config_set *cs, const char *key,
1809                                int *is_bool, int *dest)
1810{
1811        const char *value;
1812        if (!git_configset_get_value(cs, key, &value)) {
1813                *dest = git_config_bool_or_int(key, value, is_bool);
1814                return 0;
1815        } else
1816                return 1;
1817}
1818
1819int git_configset_get_maybe_bool(struct config_set *cs, const char *key, int *dest)
1820{
1821        const char *value;
1822        if (!git_configset_get_value(cs, key, &value)) {
1823                *dest = git_config_maybe_bool(key, value);
1824                if (*dest == -1)
1825                        return -1;
1826                return 0;
1827        } else
1828                return 1;
1829}
1830
1831int git_configset_get_pathname(struct config_set *cs, const char *key, const char **dest)
1832{
1833        const char *value;
1834        if (!git_configset_get_value(cs, key, &value))
1835                return git_config_pathname(dest, key, value);
1836        else
1837                return 1;
1838}
1839
1840static void git_config_check_init(void)
1841{
1842        if (the_config_set.hash_initialized)
1843                return;
1844        git_configset_init(&the_config_set);
1845        git_config_raw(config_set_callback, &the_config_set);
1846}
1847
1848void git_config_clear(void)
1849{
1850        if (!the_config_set.hash_initialized)
1851                return;
1852        git_configset_clear(&the_config_set);
1853}
1854
1855int git_config_get_value(const char *key, const char **value)
1856{
1857        git_config_check_init();
1858        return git_configset_get_value(&the_config_set, key, value);
1859}
1860
1861const struct string_list *git_config_get_value_multi(const char *key)
1862{
1863        git_config_check_init();
1864        return git_configset_get_value_multi(&the_config_set, key);
1865}
1866
1867int git_config_get_string_const(const char *key, const char **dest)
1868{
1869        int ret;
1870        git_config_check_init();
1871        ret = git_configset_get_string_const(&the_config_set, key, dest);
1872        if (ret < 0)
1873                git_die_config(key, NULL);
1874        return ret;
1875}
1876
1877int git_config_get_string(const char *key, char **dest)
1878{
1879        git_config_check_init();
1880        return git_config_get_string_const(key, (const char **)dest);
1881}
1882
1883int git_config_get_int(const char *key, int *dest)
1884{
1885        git_config_check_init();
1886        return git_configset_get_int(&the_config_set, key, dest);
1887}
1888
1889int git_config_get_ulong(const char *key, unsigned long *dest)
1890{
1891        git_config_check_init();
1892        return git_configset_get_ulong(&the_config_set, key, dest);
1893}
1894
1895int git_config_get_bool(const char *key, int *dest)
1896{
1897        git_config_check_init();
1898        return git_configset_get_bool(&the_config_set, key, dest);
1899}
1900
1901int git_config_get_bool_or_int(const char *key, int *is_bool, int *dest)
1902{
1903        git_config_check_init();
1904        return git_configset_get_bool_or_int(&the_config_set, key, is_bool, dest);
1905}
1906
1907int git_config_get_maybe_bool(const char *key, int *dest)
1908{
1909        git_config_check_init();
1910        return git_configset_get_maybe_bool(&the_config_set, key, dest);
1911}
1912
1913int git_config_get_pathname(const char *key, const char **dest)
1914{
1915        int ret;
1916        git_config_check_init();
1917        ret = git_configset_get_pathname(&the_config_set, key, dest);
1918        if (ret < 0)
1919                git_die_config(key, NULL);
1920        return ret;
1921}
1922
1923int git_config_get_expiry(const char *key, const char **output)
1924{
1925        int ret = git_config_get_string_const(key, output);
1926        if (ret)
1927                return ret;
1928        if (strcmp(*output, "now")) {
1929                unsigned long now = approxidate("now");
1930                if (approxidate(*output) >= now)
1931                        git_die_config(key, _("Invalid %s: '%s'"), key, *output);
1932        }
1933        return ret;
1934}
1935
1936int git_config_get_untracked_cache(void)
1937{
1938        int val = -1;
1939        const char *v;
1940
1941        /* Hack for test programs like test-dump-untracked-cache */
1942        if (ignore_untracked_cache_config)
1943                return -1;
1944
1945        if (!git_config_get_maybe_bool("core.untrackedcache", &val))
1946                return val;
1947
1948        if (!git_config_get_value("core.untrackedcache", &v)) {
1949                if (!strcasecmp(v, "keep"))
1950                        return -1;
1951
1952                error(_("unknown core.untrackedCache value '%s'; "
1953                        "using 'keep' default value"), v);
1954                return -1;
1955        }
1956
1957        return -1; /* default value */
1958}
1959
1960int git_config_get_split_index(void)
1961{
1962        int val;
1963
1964        if (!git_config_get_maybe_bool("core.splitindex", &val))
1965                return val;
1966
1967        return -1; /* default value */
1968}
1969
1970int git_config_get_max_percent_split_change(void)
1971{
1972        int val = -1;
1973
1974        if (!git_config_get_int("splitindex.maxpercentchange", &val)) {
1975                if (0 <= val && val <= 100)
1976                        return val;
1977
1978                return error(_("splitIndex.maxPercentChange value '%d' "
1979                               "should be between 0 and 100"), val);
1980        }
1981
1982        return -1; /* default value */
1983}
1984
1985NORETURN
1986void git_die_config_linenr(const char *key, const char *filename, int linenr)
1987{
1988        if (!filename)
1989                die(_("unable to parse '%s' from command-line config"), key);
1990        else
1991                die(_("bad config variable '%s' in file '%s' at line %d"),
1992                    key, filename, linenr);
1993}
1994
1995NORETURN __attribute__((format(printf, 2, 3)))
1996void git_die_config(const char *key, const char *err, ...)
1997{
1998        const struct string_list *values;
1999        struct key_value_info *kv_info;
2000
2001        if (err) {
2002                va_list params;
2003                va_start(params, err);
2004                vreportf("error: ", err, params);
2005                va_end(params);
2006        }
2007        values = git_config_get_value_multi(key);
2008        kv_info = values->items[values->nr - 1].util;
2009        git_die_config_linenr(key, kv_info->filename, kv_info->linenr);
2010}
2011
2012/*
2013 * Find all the stuff for git_config_set() below.
2014 */
2015
2016static struct {
2017        int baselen;
2018        char *key;
2019        int do_not_match;
2020        regex_t *value_regex;
2021        int multi_replace;
2022        size_t *offset;
2023        unsigned int offset_alloc;
2024        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
2025        int seen;
2026} store;
2027
2028static int matches(const char *key, const char *value)
2029{
2030        if (strcmp(key, store.key))
2031                return 0; /* not ours */
2032        if (!store.value_regex)
2033                return 1; /* always matches */
2034        if (store.value_regex == CONFIG_REGEX_NONE)
2035                return 0; /* never matches */
2036
2037        return store.do_not_match ^
2038                (value && !regexec(store.value_regex, value, 0, NULL, 0));
2039}
2040
2041static int store_aux(const char *key, const char *value, void *cb)
2042{
2043        const char *ep;
2044        size_t section_len;
2045
2046        switch (store.state) {
2047        case KEY_SEEN:
2048                if (matches(key, value)) {
2049                        if (store.seen == 1 && store.multi_replace == 0) {
2050                                warning(_("%s has multiple values"), key);
2051                        }
2052
2053                        ALLOC_GROW(store.offset, store.seen + 1,
2054                                   store.offset_alloc);
2055
2056                        store.offset[store.seen] = cf->do_ftell(cf);
2057                        store.seen++;
2058                }
2059                break;
2060        case SECTION_SEEN:
2061                /*
2062                 * What we are looking for is in store.key (both
2063                 * section and var), and its section part is baselen
2064                 * long.  We found key (again, both section and var).
2065                 * We would want to know if this key is in the same
2066                 * section as what we are looking for.  We already
2067                 * know we are in the same section as what should
2068                 * hold store.key.
2069                 */
2070                ep = strrchr(key, '.');
2071                section_len = ep - key;
2072
2073                if ((section_len != store.baselen) ||
2074                    memcmp(key, store.key, section_len+1)) {
2075                        store.state = SECTION_END_SEEN;
2076                        break;
2077                }
2078
2079                /*
2080                 * Do not increment matches: this is no match, but we
2081                 * just made sure we are in the desired section.
2082                 */
2083                ALLOC_GROW(store.offset, store.seen + 1,
2084                           store.offset_alloc);
2085                store.offset[store.seen] = cf->do_ftell(cf);
2086                /* fallthru */
2087        case SECTION_END_SEEN:
2088        case START:
2089                if (matches(key, value)) {
2090                        ALLOC_GROW(store.offset, store.seen + 1,
2091                                   store.offset_alloc);
2092                        store.offset[store.seen] = cf->do_ftell(cf);
2093                        store.state = KEY_SEEN;
2094                        store.seen++;
2095                } else {
2096                        if (strrchr(key, '.') - key == store.baselen &&
2097                              !strncmp(key, store.key, store.baselen)) {
2098                                        store.state = SECTION_SEEN;
2099                                        ALLOC_GROW(store.offset,
2100                                                   store.seen + 1,
2101                                                   store.offset_alloc);
2102                                        store.offset[store.seen] = cf->do_ftell(cf);
2103                        }
2104                }
2105        }
2106        return 0;
2107}
2108
2109static int write_error(const char *filename)
2110{
2111        error("failed to write new configuration file %s", filename);
2112
2113        /* Same error code as "failed to rename". */
2114        return 4;
2115}
2116
2117static int store_write_section(int fd, const char *key)
2118{
2119        const char *dot;
2120        int i, success;
2121        struct strbuf sb = STRBUF_INIT;
2122
2123        dot = memchr(key, '.', store.baselen);
2124        if (dot) {
2125                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
2126                for (i = dot - key + 1; i < store.baselen; i++) {
2127                        if (key[i] == '"' || key[i] == '\\')
2128                                strbuf_addch(&sb, '\\');
2129                        strbuf_addch(&sb, key[i]);
2130                }
2131                strbuf_addstr(&sb, "\"]\n");
2132        } else {
2133                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
2134        }
2135
2136        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
2137        strbuf_release(&sb);
2138
2139        return success;
2140}
2141
2142static int store_write_pair(int fd, const char *key, const char *value)
2143{
2144        int i, success;
2145        int length = strlen(key + store.baselen + 1);
2146        const char *quote = "";
2147        struct strbuf sb = STRBUF_INIT;
2148
2149        /*
2150         * Check to see if the value needs to be surrounded with a dq pair.
2151         * Note that problematic characters are always backslash-quoted; this
2152         * check is about not losing leading or trailing SP and strings that
2153         * follow beginning-of-comment characters (i.e. ';' and '#') by the
2154         * configuration parser.
2155         */
2156        if (value[0] == ' ')
2157                quote = "\"";
2158        for (i = 0; value[i]; i++)
2159                if (value[i] == ';' || value[i] == '#')
2160                        quote = "\"";
2161        if (i && value[i - 1] == ' ')
2162                quote = "\"";
2163
2164        strbuf_addf(&sb, "\t%.*s = %s",
2165                    length, key + store.baselen + 1, quote);
2166
2167        for (i = 0; value[i]; i++)
2168                switch (value[i]) {
2169                case '\n':
2170                        strbuf_addstr(&sb, "\\n");
2171                        break;
2172                case '\t':
2173                        strbuf_addstr(&sb, "\\t");
2174                        break;
2175                case '"':
2176                case '\\':
2177                        strbuf_addch(&sb, '\\');
2178                default:
2179                        strbuf_addch(&sb, value[i]);
2180                        break;
2181                }
2182        strbuf_addf(&sb, "%s\n", quote);
2183
2184        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
2185        strbuf_release(&sb);
2186
2187        return success;
2188}
2189
2190static ssize_t find_beginning_of_line(const char *contents, size_t size,
2191        size_t offset_, int *found_bracket)
2192{
2193        size_t equal_offset = size, bracket_offset = size;
2194        ssize_t offset;
2195
2196contline:
2197        for (offset = offset_-2; offset > 0
2198                        && contents[offset] != '\n'; offset--)
2199                switch (contents[offset]) {
2200                        case '=': equal_offset = offset; break;
2201                        case ']': bracket_offset = offset; break;
2202                }
2203        if (offset > 0 && contents[offset-1] == '\\') {
2204                offset_ = offset;
2205                goto contline;
2206        }
2207        if (bracket_offset < equal_offset) {
2208                *found_bracket = 1;
2209                offset = bracket_offset+1;
2210        } else
2211                offset++;
2212
2213        return offset;
2214}
2215
2216int git_config_set_in_file_gently(const char *config_filename,
2217                                  const char *key, const char *value)
2218{
2219        return git_config_set_multivar_in_file_gently(config_filename, key, value, NULL, 0);
2220}
2221
2222void git_config_set_in_file(const char *config_filename,
2223                            const char *key, const char *value)
2224{
2225        git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
2226}
2227
2228int git_config_set_gently(const char *key, const char *value)
2229{
2230        return git_config_set_multivar_gently(key, value, NULL, 0);
2231}
2232
2233void git_config_set(const char *key, const char *value)
2234{
2235        git_config_set_multivar(key, value, NULL, 0);
2236}
2237
2238/*
2239 * If value==NULL, unset in (remove from) config,
2240 * if value_regex!=NULL, disregard key/value pairs where value does not match.
2241 * if value_regex==CONFIG_REGEX_NONE, do not match any existing values
2242 *     (only add a new one)
2243 * if multi_replace==0, nothing, or only one matching key/value is replaced,
2244 *     else all matching key/values (regardless how many) are removed,
2245 *     before the new pair is written.
2246 *
2247 * Returns 0 on success.
2248 *
2249 * This function does this:
2250 *
2251 * - it locks the config file by creating ".git/config.lock"
2252 *
2253 * - it then parses the config using store_aux() as validator to find
2254 *   the position on the key/value pair to replace. If it is to be unset,
2255 *   it must be found exactly once.
2256 *
2257 * - the config file is mmap()ed and the part before the match (if any) is
2258 *   written to the lock file, then the changed part and the rest.
2259 *
2260 * - the config file is removed and the lock file rename()d to it.
2261 *
2262 */
2263int git_config_set_multivar_in_file_gently(const char *config_filename,
2264                                           const char *key, const char *value,
2265                                           const char *value_regex,
2266                                           int multi_replace)
2267{
2268        int fd = -1, in_fd = -1;
2269        int ret;
2270        struct lock_file *lock = NULL;
2271        char *filename_buf = NULL;
2272        char *contents = NULL;
2273        size_t contents_sz;
2274
2275        /* parse-key returns negative; flip the sign to feed exit(3) */
2276        ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
2277        if (ret)
2278                goto out_free;
2279
2280        store.multi_replace = multi_replace;
2281
2282        if (!config_filename)
2283                config_filename = filename_buf = git_pathdup("config");
2284
2285        /*
2286         * The lock serves a purpose in addition to locking: the new
2287         * contents of .git/config will be written into it.
2288         */
2289        lock = xcalloc(1, sizeof(struct lock_file));
2290        fd = hold_lock_file_for_update(lock, config_filename, 0);
2291        if (fd < 0) {
2292                error_errno("could not lock config file %s", config_filename);
2293                free(store.key);
2294                ret = CONFIG_NO_LOCK;
2295                goto out_free;
2296        }
2297
2298        /*
2299         * If .git/config does not exist yet, write a minimal version.
2300         */
2301        in_fd = open(config_filename, O_RDONLY);
2302        if ( in_fd < 0 ) {
2303                free(store.key);
2304
2305                if ( ENOENT != errno ) {
2306                        error_errno("opening %s", config_filename);
2307                        ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
2308                        goto out_free;
2309                }
2310                /* if nothing to unset, error out */
2311                if (value == NULL) {
2312                        ret = CONFIG_NOTHING_SET;
2313                        goto out_free;
2314                }
2315
2316                store.key = (char *)key;
2317                if (!store_write_section(fd, key) ||
2318                    !store_write_pair(fd, key, value))
2319                        goto write_err_out;
2320        } else {
2321                struct stat st;
2322                size_t copy_begin, copy_end;
2323                int i, new_line = 0;
2324
2325                if (value_regex == NULL)
2326                        store.value_regex = NULL;
2327                else if (value_regex == CONFIG_REGEX_NONE)
2328                        store.value_regex = CONFIG_REGEX_NONE;
2329                else {
2330                        if (value_regex[0] == '!') {
2331                                store.do_not_match = 1;
2332                                value_regex++;
2333                        } else
2334                                store.do_not_match = 0;
2335
2336                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
2337                        if (regcomp(store.value_regex, value_regex,
2338                                        REG_EXTENDED)) {
2339                                error("invalid pattern: %s", value_regex);
2340                                free(store.value_regex);
2341                                ret = CONFIG_INVALID_PATTERN;
2342                                goto out_free;
2343                        }
2344                }
2345
2346                ALLOC_GROW(store.offset, 1, store.offset_alloc);
2347                store.offset[0] = 0;
2348                store.state = START;
2349                store.seen = 0;
2350
2351                /*
2352                 * After this, store.offset will contain the *end* offset
2353                 * of the last match, or remain at 0 if no match was found.
2354                 * As a side effect, we make sure to transform only a valid
2355                 * existing config file.
2356                 */
2357                if (git_config_from_file(store_aux, config_filename, NULL)) {
2358                        error("invalid config file %s", config_filename);
2359                        free(store.key);
2360                        if (store.value_regex != NULL &&
2361                            store.value_regex != CONFIG_REGEX_NONE) {
2362                                regfree(store.value_regex);
2363                                free(store.value_regex);
2364                        }
2365                        ret = CONFIG_INVALID_FILE;
2366                        goto out_free;
2367                }
2368
2369                free(store.key);
2370                if (store.value_regex != NULL &&
2371                    store.value_regex != CONFIG_REGEX_NONE) {
2372                        regfree(store.value_regex);
2373                        free(store.value_regex);
2374                }
2375
2376                /* if nothing to unset, or too many matches, error out */
2377                if ((store.seen == 0 && value == NULL) ||
2378                                (store.seen > 1 && multi_replace == 0)) {
2379                        ret = CONFIG_NOTHING_SET;
2380                        goto out_free;
2381                }
2382
2383                if (fstat(in_fd, &st) == -1) {
2384                        error_errno(_("fstat on %s failed"), config_filename);
2385                        ret = CONFIG_INVALID_FILE;
2386                        goto out_free;
2387                }
2388
2389                contents_sz = xsize_t(st.st_size);
2390                contents = xmmap_gently(NULL, contents_sz, PROT_READ,
2391                                        MAP_PRIVATE, in_fd, 0);
2392                if (contents == MAP_FAILED) {
2393                        if (errno == ENODEV && S_ISDIR(st.st_mode))
2394                                errno = EISDIR;
2395                        error_errno("unable to mmap '%s'", config_filename);
2396                        ret = CONFIG_INVALID_FILE;
2397                        contents = NULL;
2398                        goto out_free;
2399                }
2400                close(in_fd);
2401                in_fd = -1;
2402
2403                if (chmod(get_lock_file_path(lock), st.st_mode & 07777) < 0) {
2404                        error_errno("chmod on %s failed", get_lock_file_path(lock));
2405                        ret = CONFIG_NO_WRITE;
2406                        goto out_free;
2407                }
2408
2409                if (store.seen == 0)
2410                        store.seen = 1;
2411
2412                for (i = 0, copy_begin = 0; i < store.seen; i++) {
2413                        if (store.offset[i] == 0) {
2414                                store.offset[i] = copy_end = contents_sz;
2415                        } else if (store.state != KEY_SEEN) {
2416                                copy_end = store.offset[i];
2417                        } else
2418                                copy_end = find_beginning_of_line(
2419                                        contents, contents_sz,
2420                                        store.offset[i]-2, &new_line);
2421
2422                        if (copy_end > 0 && contents[copy_end-1] != '\n')
2423                                new_line = 1;
2424
2425                        /* write the first part of the config */
2426                        if (copy_end > copy_begin) {
2427                                if (write_in_full(fd, contents + copy_begin,
2428                                                  copy_end - copy_begin) <
2429                                    copy_end - copy_begin)
2430                                        goto write_err_out;
2431                                if (new_line &&
2432                                    write_str_in_full(fd, "\n") != 1)
2433                                        goto write_err_out;
2434                        }
2435                        copy_begin = store.offset[i];
2436                }
2437
2438                /* write the pair (value == NULL means unset) */
2439                if (value != NULL) {
2440                        if (store.state == START) {
2441                                if (!store_write_section(fd, key))
2442                                        goto write_err_out;
2443                        }
2444                        if (!store_write_pair(fd, key, value))
2445                                goto write_err_out;
2446                }
2447
2448                /* write the rest of the config */
2449                if (copy_begin < contents_sz)
2450                        if (write_in_full(fd, contents + copy_begin,
2451                                          contents_sz - copy_begin) <
2452                            contents_sz - copy_begin)
2453                                goto write_err_out;
2454
2455                munmap(contents, contents_sz);
2456                contents = NULL;
2457        }
2458
2459        if (commit_lock_file(lock) < 0) {
2460                error_errno("could not write config file %s", config_filename);
2461                ret = CONFIG_NO_WRITE;
2462                lock = NULL;
2463                goto out_free;
2464        }
2465
2466        /*
2467         * lock is committed, so don't try to roll it back below.
2468         * NOTE: Since lockfile.c keeps a linked list of all created
2469         * lock_file structures, it isn't safe to free(lock).  It's
2470         * better to just leave it hanging around.
2471         */
2472        lock = NULL;
2473        ret = 0;
2474
2475        /* Invalidate the config cache */
2476        git_config_clear();
2477
2478out_free:
2479        if (lock)
2480                rollback_lock_file(lock);
2481        free(filename_buf);
2482        if (contents)
2483                munmap(contents, contents_sz);
2484        if (in_fd >= 0)
2485                close(in_fd);
2486        return ret;
2487
2488write_err_out:
2489        ret = write_error(get_lock_file_path(lock));
2490        goto out_free;
2491
2492}
2493
2494void git_config_set_multivar_in_file(const char *config_filename,
2495                                     const char *key, const char *value,
2496                                     const char *value_regex, int multi_replace)
2497{
2498        if (!git_config_set_multivar_in_file_gently(config_filename, key, value,
2499                                                    value_regex, multi_replace))
2500                return;
2501        if (value)
2502                die(_("could not set '%s' to '%s'"), key, value);
2503        else
2504                die(_("could not unset '%s'"), key);
2505}
2506
2507int git_config_set_multivar_gently(const char *key, const char *value,
2508                                   const char *value_regex, int multi_replace)
2509{
2510        return git_config_set_multivar_in_file_gently(NULL, key, value, value_regex,
2511                                                      multi_replace);
2512}
2513
2514void git_config_set_multivar(const char *key, const char *value,
2515                             const char *value_regex, int multi_replace)
2516{
2517        git_config_set_multivar_in_file(NULL, key, value, value_regex,
2518                                        multi_replace);
2519}
2520
2521static int section_name_match (const char *buf, const char *name)
2522{
2523        int i = 0, j = 0, dot = 0;
2524        if (buf[i] != '[')
2525                return 0;
2526        for (i = 1; buf[i] && buf[i] != ']'; i++) {
2527                if (!dot && isspace(buf[i])) {
2528                        dot = 1;
2529                        if (name[j++] != '.')
2530                                break;
2531                        for (i++; isspace(buf[i]); i++)
2532                                ; /* do nothing */
2533                        if (buf[i] != '"')
2534                                break;
2535                        continue;
2536                }
2537                if (buf[i] == '\\' && dot)
2538                        i++;
2539                else if (buf[i] == '"' && dot) {
2540                        for (i++; isspace(buf[i]); i++)
2541                                ; /* do_nothing */
2542                        break;
2543                }
2544                if (buf[i] != name[j++])
2545                        break;
2546        }
2547        if (buf[i] == ']' && name[j] == 0) {
2548                /*
2549                 * We match, now just find the right length offset by
2550                 * gobbling up any whitespace after it, as well
2551                 */
2552                i++;
2553                for (; buf[i] && isspace(buf[i]); i++)
2554                        ; /* do nothing */
2555                return i;
2556        }
2557        return 0;
2558}
2559
2560static int section_name_is_ok(const char *name)
2561{
2562        /* Empty section names are bogus. */
2563        if (!*name)
2564                return 0;
2565
2566        /*
2567         * Before a dot, we must be alphanumeric or dash. After the first dot,
2568         * anything goes, so we can stop checking.
2569         */
2570        for (; *name && *name != '.'; name++)
2571                if (*name != '-' && !isalnum(*name))
2572                        return 0;
2573        return 1;
2574}
2575
2576/* if new_name == NULL, the section is removed instead */
2577int git_config_rename_section_in_file(const char *config_filename,
2578                                      const char *old_name, const char *new_name)
2579{
2580        int ret = 0, remove = 0;
2581        char *filename_buf = NULL;
2582        struct lock_file *lock;
2583        int out_fd;
2584        char buf[1024];
2585        FILE *config_file;
2586        struct stat st;
2587
2588        if (new_name && !section_name_is_ok(new_name)) {
2589                ret = error("invalid section name: %s", new_name);
2590                goto out_no_rollback;
2591        }
2592
2593        if (!config_filename)
2594                config_filename = filename_buf = git_pathdup("config");
2595
2596        lock = xcalloc(1, sizeof(struct lock_file));
2597        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
2598        if (out_fd < 0) {
2599                ret = error("could not lock config file %s", config_filename);
2600                goto out;
2601        }
2602
2603        if (!(config_file = fopen(config_filename, "rb"))) {
2604                /* no config file means nothing to rename, no error */
2605                goto commit_and_out;
2606        }
2607
2608        if (fstat(fileno(config_file), &st) == -1) {
2609                ret = error_errno(_("fstat on %s failed"), config_filename);
2610                goto out;
2611        }
2612
2613        if (chmod(get_lock_file_path(lock), st.st_mode & 07777) < 0) {
2614                ret = error_errno("chmod on %s failed",
2615                                  get_lock_file_path(lock));
2616                goto out;
2617        }
2618
2619        while (fgets(buf, sizeof(buf), config_file)) {
2620                int i;
2621                int length;
2622                char *output = buf;
2623                for (i = 0; buf[i] && isspace(buf[i]); i++)
2624                        ; /* do nothing */
2625                if (buf[i] == '[') {
2626                        /* it's a section */
2627                        int offset = section_name_match(&buf[i], old_name);
2628                        if (offset > 0) {
2629                                ret++;
2630                                if (new_name == NULL) {
2631                                        remove = 1;
2632                                        continue;
2633                                }
2634                                store.baselen = strlen(new_name);
2635                                if (!store_write_section(out_fd, new_name)) {
2636                                        ret = write_error(get_lock_file_path(lock));
2637                                        goto out;
2638                                }
2639                                /*
2640                                 * We wrote out the new section, with
2641                                 * a newline, now skip the old
2642                                 * section's length
2643                                 */
2644                                output += offset + i;
2645                                if (strlen(output) > 0) {
2646                                        /*
2647                                         * More content means there's
2648                                         * a declaration to put on the
2649                                         * next line; indent with a
2650                                         * tab
2651                                         */
2652                                        output -= 1;
2653                                        output[0] = '\t';
2654                                }
2655                        }
2656                        remove = 0;
2657                }
2658                if (remove)
2659                        continue;
2660                length = strlen(output);
2661                if (write_in_full(out_fd, output, length) != length) {
2662                        ret = write_error(get_lock_file_path(lock));
2663                        goto out;
2664                }
2665        }
2666        fclose(config_file);
2667commit_and_out:
2668        if (commit_lock_file(lock) < 0)
2669                ret = error_errno("could not write config file %s",
2670                                  config_filename);
2671out:
2672        rollback_lock_file(lock);
2673out_no_rollback:
2674        free(filename_buf);
2675        return ret;
2676}
2677
2678int git_config_rename_section(const char *old_name, const char *new_name)
2679{
2680        return git_config_rename_section_in_file(NULL, old_name, new_name);
2681}
2682
2683/*
2684 * Call this to report error for your variable that should not
2685 * get a boolean value (i.e. "[my] var" means "true").
2686 */
2687#undef config_error_nonbool
2688int config_error_nonbool(const char *var)
2689{
2690        return error("missing value for '%s'", var);
2691}
2692
2693int parse_config_key(const char *var,
2694                     const char *section,
2695                     const char **subsection, int *subsection_len,
2696                     const char **key)
2697{
2698        const char *dot;
2699
2700        /* Does it start with "section." ? */
2701        if (!skip_prefix(var, section, &var) || *var != '.')
2702                return -1;
2703
2704        /*
2705         * Find the key; we don't know yet if we have a subsection, but we must
2706         * parse backwards from the end, since the subsection may have dots in
2707         * it, too.
2708         */
2709        dot = strrchr(var, '.');
2710        *key = dot + 1;
2711
2712        /* Did we have a subsection at all? */
2713        if (dot == var) {
2714                if (subsection) {
2715                        *subsection = NULL;
2716                        *subsection_len = 0;
2717                }
2718        }
2719        else {
2720                if (!subsection)
2721                        return -1;
2722                *subsection = var + 1;
2723                *subsection_len = dot - *subsection;
2724        }
2725
2726        return 0;
2727}
2728
2729const char *current_config_origin_type(void)
2730{
2731        int type;
2732        if (current_config_kvi)
2733                type = current_config_kvi->origin_type;
2734        else if(cf)
2735                type = cf->origin_type;
2736        else
2737                die("BUG: current_config_origin_type called outside config callback");
2738
2739        switch (type) {
2740        case CONFIG_ORIGIN_BLOB:
2741                return "blob";
2742        case CONFIG_ORIGIN_FILE:
2743                return "file";
2744        case CONFIG_ORIGIN_STDIN:
2745                return "standard input";
2746        case CONFIG_ORIGIN_SUBMODULE_BLOB:
2747                return "submodule-blob";
2748        case CONFIG_ORIGIN_CMDLINE:
2749                return "command line";
2750        default:
2751                die("BUG: unknown config origin type");
2752        }
2753}
2754
2755const char *current_config_name(void)
2756{
2757        const char *name;
2758        if (current_config_kvi)
2759                name = current_config_kvi->filename;
2760        else if (cf)
2761                name = cf->name;
2762        else
2763                die("BUG: current_config_name called outside config callback");
2764        return name ? name : "";
2765}
2766
2767enum config_scope current_config_scope(void)
2768{
2769        if (current_config_kvi)
2770                return current_config_kvi->scope;
2771        else
2772                return current_parsing_scope;
2773}