builtin/config.c

   1 #include "builtin.h"
   2 #include "cache.h"
   3 #include "config.h"
   4 #include "color.h"
   5 #include "parse-options.h"
   6 #include "urlmatch.h"
   7 #include "quote.h"
   8 #include "worktree.h"
   9
  10 static const char *const builtin_config_usage[] = {
  11         N_("git config [<options>]"),
  12         NULL
  13 };
  14
  15 static char *key;
  16 static regex_t *key_regexp;
  17 static const char *value_pattern;
  18 static regex_t *regexp;
  19 static int show_keys;
  20 static int omit_values;
  21 static int use_key_regexp;
  22 static int do_all;
  23 static int do_not_match;
  24 static char delim = '=';
  25 static char key_delim = ' ';
  26 static char term = '\n';
  27
  28 static int use_global_config, use_system_config, use_local_config;
  29 static int use_worktree_config;
  30 static struct git_config_source given_config_source;
  31 static int actions, type;
  32 static char *default_value;
  33 static int end_nul;
  34 static int respect_includes_opt = -1;
  35 static struct config_options config_options;
  36 static int show_origin;
  37 static int show_scope;
  38 static int fixed_value;
  39
  40 #define ACTION_GET (1<<0)
  41 #define ACTION_GET_ALL (1<<1)
  42 #define ACTION_GET_REGEXP (1<<2)
  43 #define ACTION_REPLACE_ALL (1<<3)
  44 #define ACTION_ADD (1<<4)
  45 #define ACTION_UNSET (1<<5)
  46 #define ACTION_UNSET_ALL (1<<6)
  47 #define ACTION_RENAME_SECTION (1<<7)
  48 #define ACTION_REMOVE_SECTION (1<<8)
  49 #define ACTION_LIST (1<<9)
  50 #define ACTION_EDIT (1<<10)
  51 #define ACTION_SET (1<<11)
  52 #define ACTION_SET_ALL (1<<12)
  53 #define ACTION_GET_COLOR (1<<13)
  54 #define ACTION_GET_COLORBOOL (1<<14)
  55 #define ACTION_GET_URLMATCH (1<<15)
  56
  57 /*
  58  * The actions "ACTION_LIST | ACTION_GET_*" which may produce more than
  59  * one line of output and which should therefore be paged.
  60  */
  61 #define PAGING_ACTIONS (ACTION_LIST | ACTION_GET_ALL | \
  62                         ACTION_GET_REGEXP | ACTION_GET_URLMATCH)
  63
  64 #define TYPE_BOOL               1
  65 #define TYPE_INT                2
  66 #define TYPE_BOOL_OR_INT        3
  67 #define TYPE_PATH               4
  68 #define TYPE_EXPIRY_DATE        5
  69 #define TYPE_COLOR              6
  70 #define TYPE_BOOL_OR_STR        7
  71
  72 #define OPT_CALLBACK_VALUE(s, l, v, h, i) \
  73         { OPTION_CALLBACK, (s), (l), (v), NULL, (h), PARSE_OPT_NOARG | \
  74         PARSE_OPT_NONEG, option_parse_type, (i) }
  75
  76 static NORETURN void usage_builtin_config(void);
  77
  78 static int option_parse_type(const struct option *opt, const char *arg,
  79                              int unset)
  80 {
  81         int new_type, *to_type;
  82
  83         if (unset) {
  84                 *((int *) opt->value) = 0;
  85                 return 0;
  86         }
  87
  88         /*
  89          * To support '--<type>' style flags, begin with new_type equal to
  90          * opt->defval.
  91          */
  92         new_type = opt->defval;
  93         if (!new_type) {
  94                 if (!strcmp(arg, "bool"))
  95                         new_type = TYPE_BOOL;
  96                 else if (!strcmp(arg, "int"))
  97                         new_type = TYPE_INT;
  98                 else if (!strcmp(arg, "bool-or-int"))
  99                         new_type = TYPE_BOOL_OR_INT;
 100                 else if (!strcmp(arg, "bool-or-str"))
 101                         new_type = TYPE_BOOL_OR_STR;
 102                 else if (!strcmp(arg, "path"))
 103                         new_type = TYPE_PATH;
 104                 else if (!strcmp(arg, "expiry-date"))
 105                         new_type = TYPE_EXPIRY_DATE;
 106                 else if (!strcmp(arg, "color"))
 107                         new_type = TYPE_COLOR;
 108                 else
 109                         die(_("unrecognized --type argument, %s"), arg);
 110         }
 111
 112         to_type = opt->value;
 113         if (*to_type && *to_type != new_type) {
 114                 /*
 115                  * Complain when there is a new type not equal to the old type.
 116                  * This allows for combinations like '--int --type=int' and
 117                  * '--type=int --type=int', but disallows ones like '--type=bool
 118                  * --int' and '--type=bool
 119                  * --type=int'.
 120                  */
 121                 error(_("only one type at a time"));
 122                 usage_builtin_config();
 123         }
 124         *to_type = new_type;
 125
 126         return 0;
 127 }
 128
 129 static struct option builtin_config_options[] = {
 130         OPT_GROUP(N_("Config file location")),
 131         OPT_BOOL(0, "global", &use_global_config, N_("use global config file")),
 132         OPT_BOOL(0, "system", &use_system_config, N_("use system config file")),
 133         OPT_BOOL(0, "local", &use_local_config, N_("use repository config file")),
 134         OPT_BOOL(0, "worktree", &use_worktree_config, N_("use per-worktree config file")),
 135         OPT_STRING('f', "file", &given_config_source.file, N_("file"), N_("use given config file")),
 136         OPT_STRING(0, "blob", &given_config_source.blob, N_("blob-id"), N_("read config from given blob object")),
 137         OPT_GROUP(N_("Action")),
 138         OPT_BIT(0, "get", &actions, N_("get value: name [value-pattern]"), ACTION_GET),
 139         OPT_BIT(0, "get-all", &actions, N_("get all values: key [value-pattern]"), ACTION_GET_ALL),
 140         OPT_BIT(0, "get-regexp", &actions, N_("get values for regexp: name-regex [value-pattern]"), ACTION_GET_REGEXP),
 141         OPT_BIT(0, "get-urlmatch", &actions, N_("get value specific for the URL: section[.var] URL"), ACTION_GET_URLMATCH),
 142         OPT_BIT(0, "replace-all", &actions, N_("replace all matching variables: name value [value-pattern]"), ACTION_REPLACE_ALL),
 143         OPT_BIT(0, "add", &actions, N_("add a new variable: name value"), ACTION_ADD),
 144         OPT_BIT(0, "unset", &actions, N_("remove a variable: name [value-pattern]"), ACTION_UNSET),
 145         OPT_BIT(0, "unset-all", &actions, N_("remove all matches: name [value-pattern]"), ACTION_UNSET_ALL),
 146         OPT_BIT(0, "rename-section", &actions, N_("rename section: old-name new-name"), ACTION_RENAME_SECTION),
 147         OPT_BIT(0, "remove-section", &actions, N_("remove a section: name"), ACTION_REMOVE_SECTION),
 148         OPT_BIT('l', "list", &actions, N_("list all"), ACTION_LIST),
 149         OPT_BOOL(0, "fixed-value", &fixed_value, N_("use string equality when comparing values to 'value-pattern'")),
 150         OPT_BIT('e', "edit", &actions, N_("open an editor"), ACTION_EDIT),
 151         OPT_BIT(0, "get-color", &actions, N_("find the color configured: slot [default]"), ACTION_GET_COLOR),
 152         OPT_BIT(0, "get-colorbool", &actions, N_("find the color setting: slot [stdout-is-tty]"), ACTION_GET_COLORBOOL),
 153         OPT_GROUP(N_("Type")),
 154         OPT_CALLBACK('t', "type", &type, N_("type"), N_("value is given this type"), option_parse_type),
 155         OPT_CALLBACK_VALUE(0, "bool", &type, N_("value is \"true\" or \"false\""), TYPE_BOOL),
 156         OPT_CALLBACK_VALUE(0, "int", &type, N_("value is decimal number"), TYPE_INT),
 157         OPT_CALLBACK_VALUE(0, "bool-or-int", &type, N_("value is --bool or --int"), TYPE_BOOL_OR_INT),
 158         OPT_CALLBACK_VALUE(0, "bool-or-str", &type, N_("value is --bool or string"), TYPE_BOOL_OR_STR),
 159         OPT_CALLBACK_VALUE(0, "path", &type, N_("value is a path (file or directory name)"), TYPE_PATH),
 160         OPT_CALLBACK_VALUE(0, "expiry-date", &type, N_("value is an expiry date"), TYPE_EXPIRY_DATE),
 161         OPT_GROUP(N_("Other")),
 162         OPT_BOOL('z', "null", &end_nul, N_("terminate values with NUL byte")),
 163         OPT_BOOL(0, "name-only", &omit_values, N_("show variable names only")),
 164         OPT_BOOL(0, "includes", &respect_includes_opt, N_("respect include directives on lookup")),
 165         OPT_BOOL(0, "show-origin", &show_origin, N_("show origin of config (file, standard input, blob, command line)")),
 166         OPT_BOOL(0, "show-scope", &show_scope, N_("show scope of config (worktree, local, global, system, command)")),
 167         OPT_STRING(0, "default", &default_value, N_("value"), N_("with --get, use default value when missing entry")),
 168         OPT_END(),
 169 };
 170
 171 static NORETURN void usage_builtin_config(void)
 172 {
 173         usage_with_options(builtin_config_usage, builtin_config_options);
 174 }
 175
 176 static void check_argc(int argc, int min, int max)
 177 {
 178         if (argc >= min && argc <= max)
 179                 return;
 180         if (min == max)
 181                 error(_("wrong number of arguments, should be %d"), min);
 182         else
 183                 error(_("wrong number of arguments, should be from %d to %d"),
 184                       min, max);
 185         usage_builtin_config();
 186 }
 187
 188 static void show_config_origin(struct strbuf *buf)
 189 {
 190         const char term = end_nul ? '\0' : '\t';
 191
 192         strbuf_addstr(buf, current_config_origin_type());
 193         strbuf_addch(buf, ':');
 194         if (end_nul)
 195                 strbuf_addstr(buf, current_config_name());
 196         else
 197                 quote_c_style(current_config_name(), buf, NULL, 0);
 198         strbuf_addch(buf, term);
 199 }
 200
 201 static void show_config_scope(struct strbuf *buf)
 202 {
 203         const char term = end_nul ? '\0' : '\t';
 204         const char *scope = config_scope_name(current_config_scope());
 205
 206         strbuf_addstr(buf, N_(scope));
 207         strbuf_addch(buf, term);
 208 }
 209
 210 static int show_all_config(const char *key_, const char *value_,
 211                            void *cb UNUSED)
 212 {
 213         if (show_origin || show_scope) {
 214                 struct strbuf buf = STRBUF_INIT;
 215                 if (show_scope)
 216                         show_config_scope(&buf);
 217                 if (show_origin)
 218                         show_config_origin(&buf);
 219                 /* Use fwrite as "buf" can contain \0's if "end_null" is set. */
 220                 fwrite(buf.buf, 1, buf.len, stdout);
 221                 strbuf_release(&buf);
 222         }
 223         if (!omit_values && value_)
 224                 printf("%s%c%s%c", key_, delim, value_, term);
 225         else
 226                 printf("%s%c", key_, term);
 227         return 0;
 228 }
 229
 230 struct strbuf_list {
 231         struct strbuf *items;
 232         int nr;
 233         int alloc;
 234 };
 235
 236 static int format_config(struct strbuf *buf, const char *key_, const char *value_)
 237 {
 238         if (show_scope)
 239                 show_config_scope(buf);
 240         if (show_origin)
 241                 show_config_origin(buf);
 242         if (show_keys)
 243                 strbuf_addstr(buf, key_);
 244         if (!omit_values) {
 245                 if (show_keys)
 246                         strbuf_addch(buf, key_delim);
 247
 248                 if (type == TYPE_INT)
 249                         strbuf_addf(buf, "%"PRId64,
 250                                     git_config_int64(key_, value_ ? value_ : ""));
 251                 else if (type == TYPE_BOOL)
 252                         strbuf_addstr(buf, git_config_bool(key_, value_) ?
 253                                       "true" : "false");
 254                 else if (type == TYPE_BOOL_OR_INT) {
 255                         int is_bool, v;
 256                         v = git_config_bool_or_int(key_, value_, &is_bool);
 257                         if (is_bool)
 258                                 strbuf_addstr(buf, v ? "true" : "false");
 259                         else
 260                                 strbuf_addf(buf, "%d", v);
 261                 } else if (type == TYPE_BOOL_OR_STR) {
 262                         int v = git_parse_maybe_bool(value_);
 263                         if (v < 0)
 264                                 strbuf_addstr(buf, value_);
 265                         else
 266                                 strbuf_addstr(buf, v ? "true" : "false");
 267                 } else if (type == TYPE_PATH) {
 268                         const char *v;
 269                         if (git_config_pathname(&v, key_, value_) < 0)
 270                                 return -1;
 271                         strbuf_addstr(buf, v);
 272                         free((char *)v);
 273                 } else if (type == TYPE_EXPIRY_DATE) {
 274                         timestamp_t t;
 275                         if (git_config_expiry_date(&t, key_, value_) < 0)
 276                                 return -1;
 277                         strbuf_addf(buf, "%"PRItime, t);
 278                 } else if (type == TYPE_COLOR) {
 279                         char v[COLOR_MAXLEN];
 280                         if (git_config_color(v, key_, value_) < 0)
 281                                 return -1;
 282                         strbuf_addstr(buf, v);
 283                 } else if (value_) {
 284                         strbuf_addstr(buf, value_);
 285                 } else {
 286                         /* Just show the key name; back out delimiter */
 287                         if (show_keys)
 288                                 strbuf_setlen(buf, buf->len - 1);
 289                 }
 290         }
 291         strbuf_addch(buf, term);
 292         return 0;
 293 }
 294
 295 static int collect_config(const char *key_, const char *value_, void *cb)
 296 {
 297         struct strbuf_list *values = cb;
 298
 299         if (!use_key_regexp && strcmp(key_, key))
 300                 return 0;
 301         if (use_key_regexp && regexec(key_regexp, key_, 0, NULL, 0))
 302                 return 0;
 303         if (fixed_value && strcmp(value_pattern, (value_?value_:"")))
 304                 return 0;
 305         if (regexp != NULL &&
 306             (do_not_match ^ !!regexec(regexp, (value_?value_:""), 0, NULL, 0)))
 307                 return 0;
 308
 309         ALLOC_GROW(values->items, values->nr + 1, values->alloc);
 310         strbuf_init(&values->items[values->nr], 0);
 311
 312         return format_config(&values->items[values->nr++], key_, value_);
 313 }
 314
 315 static int get_value(const char *key_, const char *regex_, unsigned flags)
 316 {
 317         int ret = CONFIG_GENERIC_ERROR;
 318         struct strbuf_list values = {NULL};
 319         int i;
 320
 321         if (use_key_regexp) {
 322                 char *tl;
 323
 324                 /*
 325                  * NEEDSWORK: this naive pattern lowercasing obviously does not
 326                  * work for more complex patterns like "^[^.]*Foo.*bar".
 327                  * Perhaps we should deprecate this altogether someday.
 328                  */
 329
 330                 key = xstrdup(key_);
 331                 for (tl = key + strlen(key) - 1;
 332                      tl >= key && *tl != '.';
 333                      tl--)
 334                         *tl = tolower(*tl);
 335                 for (tl = key; *tl && *tl != '.'; tl++)
 336                         *tl = tolower(*tl);
 337
 338                 key_regexp = (regex_t*)xmalloc(sizeof(regex_t));
 339                 if (regcomp(key_regexp, key, REG_EXTENDED)) {
 340                         error(_("invalid key pattern: %s"), key_);
 341                         FREE_AND_NULL(key_regexp);
 342                         ret = CONFIG_INVALID_PATTERN;
 343                         goto free_strings;
 344                 }
 345         } else {
 346                 if (git_config_parse_key(key_, &key, NULL)) {
 347                         ret = CONFIG_INVALID_KEY;
 348                         goto free_strings;
 349                 }
 350         }
 351
 352         if (regex_ && (flags & CONFIG_FLAGS_FIXED_VALUE))
 353                 value_pattern = regex_;
 354         else if (regex_) {
 355                 if (regex_[0] == '!') {
 356                         do_not_match = 1;
 357                         regex_++;
 358                 }
 359
 360                 regexp = (regex_t*)xmalloc(sizeof(regex_t));
 361                 if (regcomp(regexp, regex_, REG_EXTENDED)) {
 362                         error(_("invalid pattern: %s"), regex_);
 363                         FREE_AND_NULL(regexp);
 364                         ret = CONFIG_INVALID_PATTERN;
 365                         goto free_strings;
 366                 }
 367         }
 368
 369         config_with_options(collect_config, &values,
 370                             &given_config_source, &config_options);
 371
 372         if (!values.nr && default_value) {
 373                 struct strbuf *item;
 374                 ALLOC_GROW(values.items, values.nr + 1, values.alloc);
 375                 item = &values.items[values.nr++];
 376                 strbuf_init(item, 0);
 377                 if (format_config(item, key_, default_value) < 0)
 378                         die(_("failed to format default config value: %s"),
 379                                 default_value);
 380         }
 381
 382         ret = !values.nr;
 383
 384         for (i = 0; i < values.nr; i++) {
 385                 struct strbuf *buf = values.items + i;
 386                 if (do_all || i == values.nr - 1)
 387                         fwrite(buf->buf, 1, buf->len, stdout);
 388                 strbuf_release(buf);
 389         }
 390         free(values.items);
 391
 392 free_strings:
 393         free(key);
 394         if (key_regexp) {
 395                 regfree(key_regexp);
 396                 free(key_regexp);
 397         }
 398         if (regexp) {
 399                 regfree(regexp);
 400                 free(regexp);
 401         }
 402
 403         return ret;
 404 }
 405
 406 static char *normalize_value(const char *key, const char *value)
 407 {
 408         if (!value)
 409                 return NULL;
 410
 411         if (type == 0 || type == TYPE_PATH || type == TYPE_EXPIRY_DATE)
 412                 /*
 413                  * We don't do normalization for TYPE_PATH here: If
 414                  * the path is like ~/foobar/, we prefer to store
 415                  * "~/foobar/" in the config file, and to expand the ~
 416                  * when retrieving the value.
 417                  * Also don't do normalization for expiry dates.
 418                  */
 419                 return xstrdup(value);
 420         if (type == TYPE_INT)
 421                 return xstrfmt("%"PRId64, git_config_int64(key, value));
 422         if (type == TYPE_BOOL)
 423                 return xstrdup(git_config_bool(key, value) ?  "true" : "false");
 424         if (type == TYPE_BOOL_OR_INT) {
 425                 int is_bool, v;
 426                 v = git_config_bool_or_int(key, value, &is_bool);
 427                 if (!is_bool)
 428                         return xstrfmt("%d", v);
 429                 else
 430                         return xstrdup(v ? "true" : "false");
 431         }
 432         if (type == TYPE_BOOL_OR_STR) {
 433                 int v = git_parse_maybe_bool(value);
 434                 if (v < 0)
 435                         return xstrdup(value);
 436                 else
 437                         return xstrdup(v ? "true" : "false");
 438         }
 439         if (type == TYPE_COLOR) {
 440                 char v[COLOR_MAXLEN];
 441                 if (git_config_color(v, key, value))
 442                         die(_("cannot parse color '%s'"), value);
 443
 444                 /*
 445                  * The contents of `v` now contain an ANSI escape
 446                  * sequence, not suitable for including within a
 447                  * configuration file. Treat the above as a
 448                  * "sanity-check", and return the given value, which we
 449                  * know is representable as valid color code.
 450                  */
 451                 return xstrdup(value);
 452         }
 453
 454         BUG("cannot normalize type %d", type);
 455 }
 456
 457 static int get_color_found;
 458 static const char *get_color_slot;
 459 static const char *get_colorbool_slot;
 460 static char parsed_color[COLOR_MAXLEN];
 461
 462 static int git_get_color_config(const char *var, const char *value,
 463                                 void *cb UNUSED)
 464 {
 465         if (!strcmp(var, get_color_slot)) {
 466                 if (!value)
 467                         config_error_nonbool(var);
 468                 if (color_parse(value, parsed_color) < 0)
 469                         return -1;
 470                 get_color_found = 1;
 471         }
 472         return 0;
 473 }
 474
 475 static void get_color(const char *var, const char *def_color)
 476 {
 477         get_color_slot = var;
 478         get_color_found = 0;
 479         parsed_color[0] = '\0';
 480         config_with_options(git_get_color_config, NULL,
 481                             &given_config_source, &config_options);
 482
 483         if (!get_color_found && def_color) {
 484                 if (color_parse(def_color, parsed_color) < 0)
 485                         die(_("unable to parse default color value"));
 486         }
 487
 488         fputs(parsed_color, stdout);
 489 }
 490
 491 static int get_colorbool_found;
 492 static int get_diff_color_found;
 493 static int get_color_ui_found;
 494 static int git_get_colorbool_config(const char *var, const char *value,
 495                                     void *data UNUSED)
 496 {
 497         if (!strcmp(var, get_colorbool_slot))
 498                 get_colorbool_found = git_config_colorbool(var, value);
 499         else if (!strcmp(var, "diff.color"))
 500                 get_diff_color_found = git_config_colorbool(var, value);
 501         else if (!strcmp(var, "color.ui"))
 502                 get_color_ui_found = git_config_colorbool(var, value);
 503         return 0;
 504 }
 505
 506 static int get_colorbool(const char *var, int print)
 507 {
 508         get_colorbool_slot = var;
 509         get_colorbool_found = -1;
 510         get_diff_color_found = -1;
 511         get_color_ui_found = -1;
 512         config_with_options(git_get_colorbool_config, NULL,
 513                             &given_config_source, &config_options);
 514
 515         if (get_colorbool_found < 0) {
 516                 if (!strcmp(get_colorbool_slot, "color.diff"))
 517                         get_colorbool_found = get_diff_color_found;
 518                 if (get_colorbool_found < 0)
 519                         get_colorbool_found = get_color_ui_found;
 520         }
 521
 522         if (get_colorbool_found < 0)
 523                 /* default value if none found in config */
 524                 get_colorbool_found = GIT_COLOR_AUTO;
 525
 526         get_colorbool_found = want_color(get_colorbool_found);
 527
 528         if (print) {
 529                 printf("%s\n", get_colorbool_found ? "true" : "false");
 530                 return 0;
 531         } else
 532                 return get_colorbool_found ? 0 : 1;
 533 }
 534
 535 static void check_write(void)
 536 {
 537         if (!given_config_source.file && !startup_info->have_repository)
 538                 die(_("not in a git directory"));
 539
 540         if (given_config_source.use_stdin)
 541                 die(_("writing to stdin is not supported"));
 542
 543         if (given_config_source.blob)
 544                 die(_("writing config blobs is not supported"));
 545 }
 546
 547 struct urlmatch_current_candidate_value {
 548         char value_is_null;
 549         struct strbuf value;
 550 };
 551
 552 static int urlmatch_collect_fn(const char *var, const char *value, void *cb)
 553 {
 554         struct string_list *values = cb;
 555         struct string_list_item *item = string_list_insert(values, var);
 556         struct urlmatch_current_candidate_value *matched = item->util;
 557
 558         if (!matched) {
 559                 matched = xmalloc(sizeof(*matched));
 560                 strbuf_init(&matched->value, 0);
 561                 item->util = matched;
 562         } else {
 563                 strbuf_reset(&matched->value);
 564         }
 565
 566         if (value) {
 567                 strbuf_addstr(&matched->value, value);
 568                 matched->value_is_null = 0;
 569         } else {
 570                 matched->value_is_null = 1;
 571         }
 572         return 0;
 573 }
 574
 575 static int get_urlmatch(const char *var, const char *url)
 576 {
 577         int ret;
 578         char *section_tail;
 579         struct string_list_item *item;
 580         struct urlmatch_config config = URLMATCH_CONFIG_INIT;
 581         struct string_list values = STRING_LIST_INIT_DUP;
 582
 583         config.collect_fn = urlmatch_collect_fn;
 584         config.cascade_fn = NULL;
 585         config.cb = &values;
 586
 587         if (!url_normalize(url, &config.url))
 588                 die("%s", config.url.err);
 589
 590         config.section = xstrdup_tolower(var);
 591         section_tail = strchr(config.section, '.');
 592         if (section_tail) {
 593                 *section_tail = '\0';
 594                 config.key = section_tail + 1;
 595                 show_keys = 0;
 596         } else {
 597                 config.key = NULL;
 598                 show_keys = 1;
 599         }
 600
 601         config_with_options(urlmatch_config_entry, &config,
 602                             &given_config_source, &config_options);
 603
 604         ret = !values.nr;
 605
 606         for_each_string_list_item(item, &values) {
 607                 struct urlmatch_current_candidate_value *matched = item->util;
 608                 struct strbuf buf = STRBUF_INIT;
 609
 610                 format_config(&buf, item->string,
 611                               matched->value_is_null ? NULL : matched->value.buf);
 612                 fwrite(buf.buf, 1, buf.len, stdout);
 613                 strbuf_release(&buf);
 614
 615                 strbuf_release(&matched->value);
 616         }
 617         urlmatch_config_release(&config);
 618         string_list_clear(&values, 1);
 619         free(config.url.url);
 620
 621         free((void *)config.section);
 622         return ret;
 623 }
 624
 625 static char *default_user_config(void)
 626 {
 627         struct strbuf buf = STRBUF_INIT;
 628         strbuf_addf(&buf,
 629                     _("# This is Git's per-user configuration file.\n"
 630                       "[user]\n"
 631                       "# Please adapt and uncomment the following lines:\n"
 632                       "#        name = %s\n"
 633                       "#        email = %s\n"),
 634                     ident_default_name(),
 635                     ident_default_email());
 636         return strbuf_detach(&buf, NULL);
 637 }
 638
 639 int cmd_config(int argc, const char **argv, const char *prefix)
 640 {
 641         int nongit = !startup_info->have_repository;
 642         char *value = NULL;
 643         int flags = 0;
 644         int ret = 0;
 645
 646         given_config_source.file = xstrdup_or_null(getenv(CONFIG_ENVIRONMENT));
 647
 648         argc = parse_options(argc, argv, prefix, builtin_config_options,
 649                              builtin_config_usage,
 650                              PARSE_OPT_STOP_AT_NON_OPTION);
 651
 652         if (use_global_config + use_system_config + use_local_config +
 653             use_worktree_config +
 654             !!given_config_source.file + !!given_config_source.blob > 1) {
 655                 error(_("only one config file at a time"));
 656                 usage_builtin_config();
 657         }
 658
 659         if (nongit) {
 660                 if (use_local_config)
 661                         die(_("--local can only be used inside a git repository"));
 662                 if (given_config_source.blob)
 663                         die(_("--blob can only be used inside a git repository"));
 664                 if (use_worktree_config)
 665                         die(_("--worktree can only be used inside a git repository"));
 666
 667         }
 668
 669         if (given_config_source.file &&
 670                         !strcmp(given_config_source.file, "-")) {
 671                 given_config_source.file = NULL;
 672                 given_config_source.use_stdin = 1;
 673                 given_config_source.scope = CONFIG_SCOPE_COMMAND;
 674         }
 675
 676         if (use_global_config) {
 677                 char *user_config, *xdg_config;
 678
 679                 git_global_config(&user_config, &xdg_config);
 680                 if (!user_config)
 681                         /*
 682                          * It is unknown if HOME/.gitconfig exists, so
 683                          * we do not know if we should write to XDG
 684                          * location; error out even if XDG_CONFIG_HOME
 685                          * is set and points at a sane location.
 686                          */
 687                         die(_("$HOME not set"));
 688
 689                 given_config_source.scope = CONFIG_SCOPE_GLOBAL;
 690
 691                 if (access_or_warn(user_config, R_OK, 0) &&
 692                     xdg_config && !access_or_warn(xdg_config, R_OK, 0)) {
 693                         given_config_source.file = xdg_config;
 694                         free(user_config);
 695                 } else {
 696                         given_config_source.file = user_config;
 697                         free(xdg_config);
 698                 }
 699         }
 700         else if (use_system_config) {
 701                 given_config_source.file = git_system_config();
 702                 given_config_source.scope = CONFIG_SCOPE_SYSTEM;
 703         } else if (use_local_config) {
 704                 given_config_source.file = git_pathdup("config");
 705                 given_config_source.scope = CONFIG_SCOPE_LOCAL;
 706         } else if (use_worktree_config) {
 707                 struct worktree **worktrees = get_worktrees();
 708                 if (repository_format_worktree_config)
 709                         given_config_source.file = git_pathdup("config.worktree");
 710                 else if (worktrees[0] && worktrees[1])
 711                         die(_("--worktree cannot be used with multiple "
 712                               "working trees unless the config\n"
 713                               "extension worktreeConfig is enabled. "
 714                               "Please read \"CONFIGURATION FILE\"\n"
 715                               "section in \"git help worktree\" for details"));
 716                 else
 717                         given_config_source.file = git_pathdup("config");
 718                 given_config_source.scope = CONFIG_SCOPE_LOCAL;
 719                 free_worktrees(worktrees);
 720         } else if (given_config_source.file) {
 721                 if (!is_absolute_path(given_config_source.file) && prefix)
 722                         given_config_source.file =
 723                                 prefix_filename(prefix, given_config_source.file);
 724                 given_config_source.scope = CONFIG_SCOPE_COMMAND;
 725         } else if (given_config_source.blob) {
 726                 given_config_source.scope = CONFIG_SCOPE_COMMAND;
 727         }
 728
 729
 730         if (respect_includes_opt == -1)
 731                 config_options.respect_includes = !given_config_source.file;
 732         else
 733                 config_options.respect_includes = respect_includes_opt;
 734         if (!nongit) {
 735                 config_options.commondir = get_git_common_dir();
 736                 config_options.git_dir = get_git_dir();
 737         }
 738
 739         if (end_nul) {
 740                 term = '\0';
 741                 delim = '\n';
 742                 key_delim = '\n';
 743         }
 744
 745         if ((actions & (ACTION_GET_COLOR|ACTION_GET_COLORBOOL)) && type) {
 746                 error(_("--get-color and variable type are incoherent"));
 747                 usage_builtin_config();
 748         }
 749
 750         if (HAS_MULTI_BITS(actions)) {
 751                 error(_("only one action at a time"));
 752                 usage_builtin_config();
 753         }
 754         if (actions == 0)
 755                 switch (argc) {
 756                 case 1: actions = ACTION_GET; break;
 757                 case 2: actions = ACTION_SET; break;
 758                 case 3: actions = ACTION_SET_ALL; break;
 759                 default:
 760                         usage_builtin_config();
 761                 }
 762         if (omit_values &&
 763             !(actions == ACTION_LIST || actions == ACTION_GET_REGEXP)) {
 764                 error(_("--name-only is only applicable to --list or --get-regexp"));
 765                 usage_builtin_config();
 766         }
 767
 768         if (show_origin && !(actions &
 769                 (ACTION_GET|ACTION_GET_ALL|ACTION_GET_REGEXP|ACTION_LIST))) {
 770                 error(_("--show-origin is only applicable to --get, --get-all, "
 771                         "--get-regexp, and --list"));
 772                 usage_builtin_config();
 773         }
 774
 775         if (default_value && !(actions & ACTION_GET)) {
 776                 error(_("--default is only applicable to --get"));
 777                 usage_builtin_config();
 778         }
 779
 780         /* check usage of --fixed-value */
 781         if (fixed_value) {
 782                 int allowed_usage = 0;
 783
 784                 switch (actions) {
 785                 /* git config --get <name> <value-pattern> */
 786                 case ACTION_GET:
 787                 /* git config --get-all <name> <value-pattern> */
 788                 case ACTION_GET_ALL:
 789                 /* git config --get-regexp <name-pattern> <value-pattern> */
 790                 case ACTION_GET_REGEXP:
 791                 /* git config --unset <name> <value-pattern> */
 792                 case ACTION_UNSET:
 793                 /* git config --unset-all <name> <value-pattern> */
 794                 case ACTION_UNSET_ALL:
 795                         allowed_usage = argc > 1 && !!argv[1];
 796                         break;
 797
 798                 /* git config <name> <value> <value-pattern> */
 799                 case ACTION_SET_ALL:
 800                 /* git config --replace-all <name> <value> <value-pattern> */
 801                 case ACTION_REPLACE_ALL:
 802                         allowed_usage = argc > 2 && !!argv[2];
 803                         break;
 804
 805                 /* other options don't allow --fixed-value */
 806                 }
 807
 808                 if (!allowed_usage) {
 809                         error(_("--fixed-value only applies with 'value-pattern'"));
 810                         usage_builtin_config();
 811                 }
 812
 813                 flags |= CONFIG_FLAGS_FIXED_VALUE;
 814         }
 815
 816         if (actions & PAGING_ACTIONS)
 817                 setup_auto_pager("config", 1);
 818
 819         if (actions == ACTION_LIST) {
 820                 check_argc(argc, 0, 0);
 821                 if (config_with_options(show_all_config, NULL,
 822                                         &given_config_source,
 823                                         &config_options) < 0) {
 824                         if (given_config_source.file)
 825                                 die_errno(_("unable to read config file '%s'"),
 826                                           given_config_source.file);
 827                         else
 828                                 die(_("error processing config file(s)"));
 829                 }
 830         }
 831         else if (actions == ACTION_EDIT) {
 832                 char *config_file;
 833
 834                 check_argc(argc, 0, 0);
 835                 if (!given_config_source.file && nongit)
 836                         die(_("not in a git directory"));
 837                 if (given_config_source.use_stdin)
 838                         die(_("editing stdin is not supported"));
 839                 if (given_config_source.blob)
 840                         die(_("editing blobs is not supported"));
 841                 git_config(git_default_config, NULL);
 842                 config_file = given_config_source.file ?
 843                                 xstrdup(given_config_source.file) :
 844                                 git_pathdup("config");
 845                 if (use_global_config) {
 846                         int fd = open(config_file, O_CREAT | O_EXCL | O_WRONLY, 0666);
 847                         if (fd >= 0) {
 848                                 char *content = default_user_config();
 849                                 write_str_in_full(fd, content);
 850                                 free(content);
 851                                 close(fd);
 852                         }
 853                         else if (errno != EEXIST)
 854                                 die_errno(_("cannot create configuration file %s"), config_file);
 855                 }
 856                 launch_editor(config_file, NULL, NULL);
 857                 free(config_file);
 858         }
 859         else if (actions == ACTION_SET) {
 860                 check_write();
 861                 check_argc(argc, 2, 2);
 862                 value = normalize_value(argv[0], argv[1]);
 863                 ret = git_config_set_in_file_gently(given_config_source.file, argv[0], value);
 864                 if (ret == CONFIG_NOTHING_SET)
 865                         error(_("cannot overwrite multiple values with a single value\n"
 866                         "       Use a regexp, --add or --replace-all to change %s."), argv[0]);
 867         }
 868         else if (actions == ACTION_SET_ALL) {
 869                 check_write();
 870                 check_argc(argc, 2, 3);
 871                 value = normalize_value(argv[0], argv[1]);
 872                 ret = git_config_set_multivar_in_file_gently(given_config_source.file,
 873                                                              argv[0], value, argv[2],
 874                                                              flags);
 875         }
 876         else if (actions == ACTION_ADD) {
 877                 check_write();
 878                 check_argc(argc, 2, 2);
 879                 value = normalize_value(argv[0], argv[1]);
 880                 ret = git_config_set_multivar_in_file_gently(given_config_source.file,
 881                                                              argv[0], value,
 882                                                              CONFIG_REGEX_NONE,
 883                                                              flags);
 884         }
 885         else if (actions == ACTION_REPLACE_ALL) {
 886                 check_write();
 887                 check_argc(argc, 2, 3);
 888                 value = normalize_value(argv[0], argv[1]);
 889                 ret = git_config_set_multivar_in_file_gently(given_config_source.file,
 890                                                              argv[0], value, argv[2],
 891                                                              flags | CONFIG_FLAGS_MULTI_REPLACE);
 892         }
 893         else if (actions == ACTION_GET) {
 894                 check_argc(argc, 1, 2);
 895                 return get_value(argv[0], argv[1], flags);
 896         }
 897         else if (actions == ACTION_GET_ALL) {
 898                 do_all = 1;
 899                 check_argc(argc, 1, 2);
 900                 return get_value(argv[0], argv[1], flags);
 901         }
 902         else if (actions == ACTION_GET_REGEXP) {
 903                 show_keys = 1;
 904                 use_key_regexp = 1;
 905                 do_all = 1;
 906                 check_argc(argc, 1, 2);
 907                 return get_value(argv[0], argv[1], flags);
 908         }
 909         else if (actions == ACTION_GET_URLMATCH) {
 910                 check_argc(argc, 2, 2);
 911                 return get_urlmatch(argv[0], argv[1]);
 912         }
 913         else if (actions == ACTION_UNSET) {
 914                 check_write();
 915                 check_argc(argc, 1, 2);
 916                 if (argc == 2)
 917                         return git_config_set_multivar_in_file_gently(given_config_source.file,
 918                                                                       argv[0], NULL, argv[1],
 919                                                                       flags);
 920                 else
 921                         return git_config_set_in_file_gently(given_config_source.file,
 922                                                              argv[0], NULL);
 923         }
 924         else if (actions == ACTION_UNSET_ALL) {
 925                 check_write();
 926                 check_argc(argc, 1, 2);
 927                 return git_config_set_multivar_in_file_gently(given_config_source.file,
 928                                                               argv[0], NULL, argv[1],
 929                                                               flags | CONFIG_FLAGS_MULTI_REPLACE);
 930         }
 931         else if (actions == ACTION_RENAME_SECTION) {
 932                 check_write();
 933                 check_argc(argc, 2, 2);
 934                 ret = git_config_rename_section_in_file(given_config_source.file,
 935                                                         argv[0], argv[1]);
 936                 if (ret < 0)
 937                         return ret;
 938                 else if (!ret)
 939                         die(_("no such section: %s"), argv[0]);
 940                 else
 941                         ret = 0;
 942         }
 943         else if (actions == ACTION_REMOVE_SECTION) {
 944                 check_write();
 945                 check_argc(argc, 1, 1);
 946                 ret = git_config_rename_section_in_file(given_config_source.file,
 947                                                         argv[0], NULL);
 948                 if (ret < 0)
 949                         return ret;
 950                 else if (!ret)
 951                         die(_("no such section: %s"), argv[0]);
 952                 else
 953                         ret = 0;
 954         }
 955         else if (actions == ACTION_GET_COLOR) {
 956                 check_argc(argc, 1, 2);
 957                 get_color(argv[0], argv[1]);
 958         }
 959         else if (actions == ACTION_GET_COLORBOOL) {
 960                 check_argc(argc, 1, 2);
 961                 if (argc == 2)
 962                         color_stdout_is_tty = git_config_bool("command line", argv[1]);
 963                 return get_colorbool(argv[0], argc == 2);
 964         }
 965
 966         free(value);
 967         return ret;
 968 }