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_, void *cb)
 211 {
 212         if (show_origin || show_scope) {
 213                 struct strbuf buf = STRBUF_INIT;
 214                 if (show_scope)
 215                         show_config_scope(&buf);
 216                 if (show_origin)
 217                         show_config_origin(&buf);
 218                 /* Use fwrite as "buf" can contain \0's if "end_null" is set. */
 219                 fwrite(buf.buf, 1, buf.len, stdout);
 220                 strbuf_release(&buf);
 221         }
 222         if (!omit_values && value_)
 223                 printf("%s%c%s%c", key_, delim, value_, term);
 224         else
 225                 printf("%s%c", key_, term);
 226         return 0;
 227 }
 228
 229 struct strbuf_list {
 230         struct strbuf *items;
 231         int nr;
 232         int alloc;
 233 };
 234
 235 static int format_config(struct strbuf *buf, const char *key_, const char *value_)
 236 {
 237         if (show_scope)
 238                 show_config_scope(buf);
 239         if (show_origin)
 240                 show_config_origin(buf);
 241         if (show_keys)
 242                 strbuf_addstr(buf, key_);
 243         if (!omit_values) {
 244                 if (show_keys)
 245                         strbuf_addch(buf, key_delim);
 246
 247                 if (type == TYPE_INT)
 248                         strbuf_addf(buf, "%"PRId64,
 249                                     git_config_int64(key_, value_ ? value_ : ""));
 250                 else if (type == TYPE_BOOL)
 251                         strbuf_addstr(buf, git_config_bool(key_, value_) ?
 252                                       "true" : "false");
 253                 else if (type == TYPE_BOOL_OR_INT) {
 254                         int is_bool, v;
 255                         v = git_config_bool_or_int(key_, value_, &is_bool);
 256                         if (is_bool)
 257                                 strbuf_addstr(buf, v ? "true" : "false");
 258                         else
 259                                 strbuf_addf(buf, "%d", v);
 260                 } else if (type == TYPE_BOOL_OR_STR) {
 261                         int v = git_parse_maybe_bool(value_);
 262                         if (v < 0)
 263                                 strbuf_addstr(buf, value_);
 264                         else
 265                                 strbuf_addstr(buf, v ? "true" : "false");
 266                 } else if (type == TYPE_PATH) {
 267                         const char *v;
 268                         if (git_config_pathname(&v, key_, value_) < 0)
 269                                 return -1;
 270                         strbuf_addstr(buf, v);
 271                         free((char *)v);
 272                 } else if (type == TYPE_EXPIRY_DATE) {
 273                         timestamp_t t;
 274                         if (git_config_expiry_date(&t, key_, value_) < 0)
 275                                 return -1;
 276                         strbuf_addf(buf, "%"PRItime, t);
 277                 } else if (type == TYPE_COLOR) {
 278                         char v[COLOR_MAXLEN];
 279                         if (git_config_color(v, key_, value_) < 0)
 280                                 return -1;
 281                         strbuf_addstr(buf, v);
 282                 } else if (value_) {
 283                         strbuf_addstr(buf, value_);
 284                 } else {
 285                         /* Just show the key name; back out delimiter */
 286                         if (show_keys)
 287                                 strbuf_setlen(buf, buf->len - 1);
 288                 }
 289         }
 290         strbuf_addch(buf, term);
 291         return 0;
 292 }
 293
 294 static int collect_config(const char *key_, const char *value_, void *cb)
 295 {
 296         struct strbuf_list *values = cb;
 297
 298         if (!use_key_regexp && strcmp(key_, key))
 299                 return 0;
 300         if (use_key_regexp && regexec(key_regexp, key_, 0, NULL, 0))
 301                 return 0;
 302         if (fixed_value && strcmp(value_pattern, (value_?value_:"")))
 303                 return 0;
 304         if (regexp != NULL &&
 305             (do_not_match ^ !!regexec(regexp, (value_?value_:""), 0, NULL, 0)))
 306                 return 0;
 307
 308         ALLOC_GROW(values->items, values->nr + 1, values->alloc);
 309         strbuf_init(&values->items[values->nr], 0);
 310
 311         return format_config(&values->items[values->nr++], key_, value_);
 312 }
 313
 314 static int get_value(const char *key_, const char *regex_, unsigned flags)
 315 {
 316         int ret = CONFIG_GENERIC_ERROR;
 317         struct strbuf_list values = {NULL};
 318         int i;
 319
 320         if (use_key_regexp) {
 321                 char *tl;
 322
 323                 /*
 324                  * NEEDSWORK: this naive pattern lowercasing obviously does not
 325                  * work for more complex patterns like "^[^.]*Foo.*bar".
 326                  * Perhaps we should deprecate this altogether someday.
 327                  */
 328
 329                 key = xstrdup(key_);
 330                 for (tl = key + strlen(key) - 1;
 331                      tl >= key && *tl != '.';
 332                      tl--)
 333                         *tl = tolower(*tl);
 334                 for (tl = key; *tl && *tl != '.'; tl++)
 335                         *tl = tolower(*tl);
 336
 337                 key_regexp = (regex_t*)xmalloc(sizeof(regex_t));
 338                 if (regcomp(key_regexp, key, REG_EXTENDED)) {
 339                         error(_("invalid key pattern: %s"), key_);
 340                         FREE_AND_NULL(key_regexp);
 341                         ret = CONFIG_INVALID_PATTERN;
 342                         goto free_strings;
 343                 }
 344         } else {
 345                 if (git_config_parse_key(key_, &key, NULL)) {
 346                         ret = CONFIG_INVALID_KEY;
 347                         goto free_strings;
 348                 }
 349         }
 350
 351         if (regex_ && (flags & CONFIG_FLAGS_FIXED_VALUE))
 352                 value_pattern = regex_;
 353         else if (regex_) {
 354                 if (regex_[0] == '!') {
 355                         do_not_match = 1;
 356                         regex_++;
 357                 }
 358
 359                 regexp = (regex_t*)xmalloc(sizeof(regex_t));
 360                 if (regcomp(regexp, regex_, REG_EXTENDED)) {
 361                         error(_("invalid pattern: %s"), regex_);
 362                         FREE_AND_NULL(regexp);
 363                         ret = CONFIG_INVALID_PATTERN;
 364                         goto free_strings;
 365                 }
 366         }
 367
 368         config_with_options(collect_config, &values,
 369                             &given_config_source, &config_options);
 370
 371         if (!values.nr && default_value) {
 372                 struct strbuf *item;
 373                 ALLOC_GROW(values.items, values.nr + 1, values.alloc);
 374                 item = &values.items[values.nr++];
 375                 strbuf_init(item, 0);
 376                 if (format_config(item, key_, default_value) < 0)
 377                         die(_("failed to format default config value: %s"),
 378                                 default_value);
 379         }
 380
 381         ret = !values.nr;
 382
 383         for (i = 0; i < values.nr; i++) {
 384                 struct strbuf *buf = values.items + i;
 385                 if (do_all || i == values.nr - 1)
 386                         fwrite(buf->buf, 1, buf->len, stdout);
 387                 strbuf_release(buf);
 388         }
 389         free(values.items);
 390
 391 free_strings:
 392         free(key);
 393         if (key_regexp) {
 394                 regfree(key_regexp);
 395                 free(key_regexp);
 396         }
 397         if (regexp) {
 398                 regfree(regexp);
 399                 free(regexp);
 400         }
 401
 402         return ret;
 403 }
 404
 405 static char *normalize_value(const char *key, const char *value)
 406 {
 407         if (!value)
 408                 return NULL;
 409
 410         if (type == 0 || type == TYPE_PATH || type == TYPE_EXPIRY_DATE)
 411                 /*
 412                  * We don't do normalization for TYPE_PATH here: If
 413                  * the path is like ~/foobar/, we prefer to store
 414                  * "~/foobar/" in the config file, and to expand the ~
 415                  * when retrieving the value.
 416                  * Also don't do normalization for expiry dates.
 417                  */
 418                 return xstrdup(value);
 419         if (type == TYPE_INT)
 420                 return xstrfmt("%"PRId64, git_config_int64(key, value));
 421         if (type == TYPE_BOOL)
 422                 return xstrdup(git_config_bool(key, value) ?  "true" : "false");
 423         if (type == TYPE_BOOL_OR_INT) {
 424                 int is_bool, v;
 425                 v = git_config_bool_or_int(key, value, &is_bool);
 426                 if (!is_bool)
 427                         return xstrfmt("%d", v);
 428                 else
 429                         return xstrdup(v ? "true" : "false");
 430         }
 431         if (type == TYPE_BOOL_OR_STR) {
 432                 int v = git_parse_maybe_bool(value);
 433                 if (v < 0)
 434                         return xstrdup(value);
 435                 else
 436                         return xstrdup(v ? "true" : "false");
 437         }
 438         if (type == TYPE_COLOR) {
 439                 char v[COLOR_MAXLEN];
 440                 if (git_config_color(v, key, value))
 441                         die(_("cannot parse color '%s'"), value);
 442
 443                 /*
 444                  * The contents of `v` now contain an ANSI escape
 445                  * sequence, not suitable for including within a
 446                  * configuration file. Treat the above as a
 447                  * "sanity-check", and return the given value, which we
 448                  * know is representable as valid color code.
 449                  */
 450                 return xstrdup(value);
 451         }
 452
 453         BUG("cannot normalize type %d", type);
 454 }
 455
 456 static int get_color_found;
 457 static const char *get_color_slot;
 458 static const char *get_colorbool_slot;
 459 static char parsed_color[COLOR_MAXLEN];
 460
 461 static int git_get_color_config(const char *var, const char *value, void *cb)
 462 {
 463         if (!strcmp(var, get_color_slot)) {
 464                 if (!value)
 465                         config_error_nonbool(var);
 466                 if (color_parse(value, parsed_color) < 0)
 467                         return -1;
 468                 get_color_found = 1;
 469         }
 470         return 0;
 471 }
 472
 473 static void get_color(const char *var, const char *def_color)
 474 {
 475         get_color_slot = var;
 476         get_color_found = 0;
 477         parsed_color[0] = '\0';
 478         config_with_options(git_get_color_config, NULL,
 479                             &given_config_source, &config_options);
 480
 481         if (!get_color_found && def_color) {
 482                 if (color_parse(def_color, parsed_color) < 0)
 483                         die(_("unable to parse default color value"));
 484         }
 485
 486         fputs(parsed_color, stdout);
 487 }
 488
 489 static int get_colorbool_found;
 490 static int get_diff_color_found;
 491 static int get_color_ui_found;
 492 static int git_get_colorbool_config(const char *var, const char *value,
 493                 void *cb)
 494 {
 495         if (!strcmp(var, get_colorbool_slot))
 496                 get_colorbool_found = git_config_colorbool(var, value);
 497         else if (!strcmp(var, "diff.color"))
 498                 get_diff_color_found = git_config_colorbool(var, value);
 499         else if (!strcmp(var, "color.ui"))
 500                 get_color_ui_found = git_config_colorbool(var, value);
 501         return 0;
 502 }
 503
 504 static int get_colorbool(const char *var, int print)
 505 {
 506         get_colorbool_slot = var;
 507         get_colorbool_found = -1;
 508         get_diff_color_found = -1;
 509         get_color_ui_found = -1;
 510         config_with_options(git_get_colorbool_config, NULL,
 511                             &given_config_source, &config_options);
 512
 513         if (get_colorbool_found < 0) {
 514                 if (!strcmp(get_colorbool_slot, "color.diff"))
 515                         get_colorbool_found = get_diff_color_found;
 516                 if (get_colorbool_found < 0)
 517                         get_colorbool_found = get_color_ui_found;
 518         }
 519
 520         if (get_colorbool_found < 0)
 521                 /* default value if none found in config */
 522                 get_colorbool_found = GIT_COLOR_AUTO;
 523
 524         get_colorbool_found = want_color(get_colorbool_found);
 525
 526         if (print) {
 527                 printf("%s\n", get_colorbool_found ? "true" : "false");
 528                 return 0;
 529         } else
 530                 return get_colorbool_found ? 0 : 1;
 531 }
 532
 533 static void check_write(void)
 534 {
 535         if (!given_config_source.file && !startup_info->have_repository)
 536                 die(_("not in a git directory"));
 537
 538         if (given_config_source.use_stdin)
 539                 die(_("writing to stdin is not supported"));
 540
 541         if (given_config_source.blob)
 542                 die(_("writing config blobs is not supported"));
 543 }
 544
 545 struct urlmatch_current_candidate_value {
 546         char value_is_null;
 547         struct strbuf value;
 548 };
 549
 550 static int urlmatch_collect_fn(const char *var, const char *value, void *cb)
 551 {
 552         struct string_list *values = cb;
 553         struct string_list_item *item = string_list_insert(values, var);
 554         struct urlmatch_current_candidate_value *matched = item->util;
 555
 556         if (!matched) {
 557                 matched = xmalloc(sizeof(*matched));
 558                 strbuf_init(&matched->value, 0);
 559                 item->util = matched;
 560         } else {
 561                 strbuf_reset(&matched->value);
 562         }
 563
 564         if (value) {
 565                 strbuf_addstr(&matched->value, value);
 566                 matched->value_is_null = 0;
 567         } else {
 568                 matched->value_is_null = 1;
 569         }
 570         return 0;
 571 }
 572
 573 static int get_urlmatch(const char *var, const char *url)
 574 {
 575         int ret;
 576         char *section_tail;
 577         struct string_list_item *item;
 578         struct urlmatch_config config = URLMATCH_CONFIG_INIT;
 579         struct string_list values = STRING_LIST_INIT_DUP;
 580
 581         config.collect_fn = urlmatch_collect_fn;
 582         config.cascade_fn = NULL;
 583         config.cb = &values;
 584
 585         if (!url_normalize(url, &config.url))
 586                 die("%s", config.url.err);
 587
 588         config.section = xstrdup_tolower(var);
 589         section_tail = strchr(config.section, '.');
 590         if (section_tail) {
 591                 *section_tail = '\0';
 592                 config.key = section_tail + 1;
 593                 show_keys = 0;
 594         } else {
 595                 config.key = NULL;
 596                 show_keys = 1;
 597         }
 598
 599         config_with_options(urlmatch_config_entry, &config,
 600                             &given_config_source, &config_options);
 601
 602         ret = !values.nr;
 603
 604         for_each_string_list_item(item, &values) {
 605                 struct urlmatch_current_candidate_value *matched = item->util;
 606                 struct strbuf buf = STRBUF_INIT;
 607
 608                 format_config(&buf, item->string,
 609                               matched->value_is_null ? NULL : matched->value.buf);
 610                 fwrite(buf.buf, 1, buf.len, stdout);
 611                 strbuf_release(&buf);
 612
 613                 strbuf_release(&matched->value);
 614         }
 615         urlmatch_config_release(&config);
 616         string_list_clear(&values, 1);
 617         free(config.url.url);
 618
 619         free((void *)config.section);
 620         return ret;
 621 }
 622
 623 static char *default_user_config(void)
 624 {
 625         struct strbuf buf = STRBUF_INIT;
 626         strbuf_addf(&buf,
 627                     _("# This is Git's per-user configuration file.\n"
 628                       "[user]\n"
 629                       "# Please adapt and uncomment the following lines:\n"
 630                       "#        name = %s\n"
 631                       "#        email = %s\n"),
 632                     ident_default_name(),
 633                     ident_default_email());
 634         return strbuf_detach(&buf, NULL);
 635 }
 636
 637 int cmd_config(int argc, const char **argv, const char *prefix)
 638 {
 639         int nongit = !startup_info->have_repository;
 640         char *value;
 641         int flags = 0;
 642
 643         given_config_source.file = xstrdup_or_null(getenv(CONFIG_ENVIRONMENT));
 644
 645         argc = parse_options(argc, argv, prefix, builtin_config_options,
 646                              builtin_config_usage,
 647                              PARSE_OPT_STOP_AT_NON_OPTION);
 648
 649         if (use_global_config + use_system_config + use_local_config +
 650             use_worktree_config +
 651             !!given_config_source.file + !!given_config_source.blob > 1) {
 652                 error(_("only one config file at a time"));
 653                 usage_builtin_config();
 654         }
 655
 656         if (nongit) {
 657                 if (use_local_config)
 658                         die(_("--local can only be used inside a git repository"));
 659                 if (given_config_source.blob)
 660                         die(_("--blob can only be used inside a git repository"));
 661                 if (use_worktree_config)
 662                         die(_("--worktree can only be used inside a git repository"));
 663
 664         }
 665
 666         if (given_config_source.file &&
 667                         !strcmp(given_config_source.file, "-")) {
 668                 given_config_source.file = NULL;
 669                 given_config_source.use_stdin = 1;
 670                 given_config_source.scope = CONFIG_SCOPE_COMMAND;
 671         }
 672
 673         if (use_global_config) {
 674                 char *user_config, *xdg_config;
 675
 676                 git_global_config(&user_config, &xdg_config);
 677                 if (!user_config)
 678                         /*
 679                          * It is unknown if HOME/.gitconfig exists, so
 680                          * we do not know if we should write to XDG
 681                          * location; error out even if XDG_CONFIG_HOME
 682                          * is set and points at a sane location.
 683                          */
 684                         die(_("$HOME not set"));
 685
 686                 given_config_source.scope = CONFIG_SCOPE_GLOBAL;
 687
 688                 if (access_or_warn(user_config, R_OK, 0) &&
 689                     xdg_config && !access_or_warn(xdg_config, R_OK, 0)) {
 690                         given_config_source.file = xdg_config;
 691                         free(user_config);
 692                 } else {
 693                         given_config_source.file = user_config;
 694                         free(xdg_config);
 695                 }
 696         }
 697         else if (use_system_config) {
 698                 given_config_source.file = git_system_config();
 699                 given_config_source.scope = CONFIG_SCOPE_SYSTEM;
 700         } else if (use_local_config) {
 701                 given_config_source.file = git_pathdup("config");
 702                 given_config_source.scope = CONFIG_SCOPE_LOCAL;
 703         } else if (use_worktree_config) {
 704                 struct worktree **worktrees = get_worktrees();
 705                 if (repository_format_worktree_config)
 706                         given_config_source.file = git_pathdup("config.worktree");
 707                 else if (worktrees[0] && worktrees[1])
 708                         die(_("--worktree cannot be used with multiple "
 709                               "working trees unless the config\n"
 710                               "extension worktreeConfig is enabled. "
 711                               "Please read \"CONFIGURATION FILE\"\n"
 712                               "section in \"git help worktree\" for details"));
 713                 else
 714                         given_config_source.file = git_pathdup("config");
 715                 given_config_source.scope = CONFIG_SCOPE_LOCAL;
 716                 free_worktrees(worktrees);
 717         } else if (given_config_source.file) {
 718                 if (!is_absolute_path(given_config_source.file) && prefix)
 719                         given_config_source.file =
 720                                 prefix_filename(prefix, given_config_source.file);
 721                 given_config_source.scope = CONFIG_SCOPE_COMMAND;
 722         } else if (given_config_source.blob) {
 723                 given_config_source.scope = CONFIG_SCOPE_COMMAND;
 724         }
 725
 726
 727         if (respect_includes_opt == -1)
 728                 config_options.respect_includes = !given_config_source.file;
 729         else
 730                 config_options.respect_includes = respect_includes_opt;
 731         if (!nongit) {
 732                 config_options.commondir = get_git_common_dir();
 733                 config_options.git_dir = get_git_dir();
 734         }
 735
 736         if (end_nul) {
 737                 term = '\0';
 738                 delim = '\n';
 739                 key_delim = '\n';
 740         }
 741
 742         if ((actions & (ACTION_GET_COLOR|ACTION_GET_COLORBOOL)) && type) {
 743                 error(_("--get-color and variable type are incoherent"));
 744                 usage_builtin_config();
 745         }
 746
 747         if (HAS_MULTI_BITS(actions)) {
 748                 error(_("only one action at a time"));
 749                 usage_builtin_config();
 750         }
 751         if (actions == 0)
 752                 switch (argc) {
 753                 case 1: actions = ACTION_GET; break;
 754                 case 2: actions = ACTION_SET; break;
 755                 case 3: actions = ACTION_SET_ALL; break;
 756                 default:
 757                         usage_builtin_config();
 758                 }
 759         if (omit_values &&
 760             !(actions == ACTION_LIST || actions == ACTION_GET_REGEXP)) {
 761                 error(_("--name-only is only applicable to --list or --get-regexp"));
 762                 usage_builtin_config();
 763         }
 764
 765         if (show_origin && !(actions &
 766                 (ACTION_GET|ACTION_GET_ALL|ACTION_GET_REGEXP|ACTION_LIST))) {
 767                 error(_("--show-origin is only applicable to --get, --get-all, "
 768                         "--get-regexp, and --list"));
 769                 usage_builtin_config();
 770         }
 771
 772         if (default_value && !(actions & ACTION_GET)) {
 773                 error(_("--default is only applicable to --get"));
 774                 usage_builtin_config();
 775         }
 776
 777         /* check usage of --fixed-value */
 778         if (fixed_value) {
 779                 int allowed_usage = 0;
 780
 781                 switch (actions) {
 782                 /* git config --get <name> <value-pattern> */
 783                 case ACTION_GET:
 784                 /* git config --get-all <name> <value-pattern> */
 785                 case ACTION_GET_ALL:
 786                 /* git config --get-regexp <name-pattern> <value-pattern> */
 787                 case ACTION_GET_REGEXP:
 788                 /* git config --unset <name> <value-pattern> */
 789                 case ACTION_UNSET:
 790                 /* git config --unset-all <name> <value-pattern> */
 791                 case ACTION_UNSET_ALL:
 792                         allowed_usage = argc > 1 && !!argv[1];
 793                         break;
 794
 795                 /* git config <name> <value> <value-pattern> */
 796                 case ACTION_SET_ALL:
 797                 /* git config --replace-all <name> <value> <value-pattern> */
 798                 case ACTION_REPLACE_ALL:
 799                         allowed_usage = argc > 2 && !!argv[2];
 800                         break;
 801
 802                 /* other options don't allow --fixed-value */
 803                 }
 804
 805                 if (!allowed_usage) {
 806                         error(_("--fixed-value only applies with 'value-pattern'"));
 807                         usage_builtin_config();
 808                 }
 809
 810                 flags |= CONFIG_FLAGS_FIXED_VALUE;
 811         }
 812
 813         if (actions & PAGING_ACTIONS)
 814                 setup_auto_pager("config", 1);
 815
 816         if (actions == ACTION_LIST) {
 817                 check_argc(argc, 0, 0);
 818                 if (config_with_options(show_all_config, NULL,
 819                                         &given_config_source,
 820                                         &config_options) < 0) {
 821                         if (given_config_source.file)
 822                                 die_errno(_("unable to read config file '%s'"),
 823                                           given_config_source.file);
 824                         else
 825                                 die(_("error processing config file(s)"));
 826                 }
 827         }
 828         else if (actions == ACTION_EDIT) {
 829                 char *config_file;
 830
 831                 check_argc(argc, 0, 0);
 832                 if (!given_config_source.file && nongit)
 833                         die(_("not in a git directory"));
 834                 if (given_config_source.use_stdin)
 835                         die(_("editing stdin is not supported"));
 836                 if (given_config_source.blob)
 837                         die(_("editing blobs is not supported"));
 838                 git_config(git_default_config, NULL);
 839                 config_file = given_config_source.file ?
 840                                 xstrdup(given_config_source.file) :
 841                                 git_pathdup("config");
 842                 if (use_global_config) {
 843                         int fd = open(config_file, O_CREAT | O_EXCL | O_WRONLY, 0666);
 844                         if (fd >= 0) {
 845                                 char *content = default_user_config();
 846                                 write_str_in_full(fd, content);
 847                                 free(content);
 848                                 close(fd);
 849                         }
 850                         else if (errno != EEXIST)
 851                                 die_errno(_("cannot create configuration file %s"), config_file);
 852                 }
 853                 launch_editor(config_file, NULL, NULL);
 854                 free(config_file);
 855         }
 856         else if (actions == ACTION_SET) {
 857                 int ret;
 858                 check_write();
 859                 check_argc(argc, 2, 2);
 860                 value = normalize_value(argv[0], argv[1]);
 861                 UNLEAK(value);
 862                 ret = git_config_set_in_file_gently(given_config_source.file, argv[0], value);
 863                 if (ret == CONFIG_NOTHING_SET)
 864                         error(_("cannot overwrite multiple values with a single value\n"
 865                         "       Use a regexp, --add or --replace-all to change %s."), argv[0]);
 866                 return ret;
 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                 UNLEAK(value);
 873                 return git_config_set_multivar_in_file_gently(given_config_source.file,
 874                                                               argv[0], value, argv[2],
 875                                                               flags);
 876         }
 877         else if (actions == ACTION_ADD) {
 878                 check_write();
 879                 check_argc(argc, 2, 2);
 880                 value = normalize_value(argv[0], argv[1]);
 881                 UNLEAK(value);
 882                 return git_config_set_multivar_in_file_gently(given_config_source.file,
 883                                                               argv[0], value,
 884                                                               CONFIG_REGEX_NONE,
 885                                                               flags);
 886         }
 887         else if (actions == ACTION_REPLACE_ALL) {
 888                 check_write();
 889                 check_argc(argc, 2, 3);
 890                 value = normalize_value(argv[0], argv[1]);
 891                 UNLEAK(value);
 892                 return git_config_set_multivar_in_file_gently(given_config_source.file,
 893                                                               argv[0], value, argv[2],
 894                                                               flags | CONFIG_FLAGS_MULTI_REPLACE);
 895         }
 896         else if (actions == ACTION_GET) {
 897                 check_argc(argc, 1, 2);
 898                 return get_value(argv[0], argv[1], flags);
 899         }
 900         else if (actions == ACTION_GET_ALL) {
 901                 do_all = 1;
 902                 check_argc(argc, 1, 2);
 903                 return get_value(argv[0], argv[1], flags);
 904         }
 905         else if (actions == ACTION_GET_REGEXP) {
 906                 show_keys = 1;
 907                 use_key_regexp = 1;
 908                 do_all = 1;
 909                 check_argc(argc, 1, 2);
 910                 return get_value(argv[0], argv[1], flags);
 911         }
 912         else if (actions == ACTION_GET_URLMATCH) {
 913                 check_argc(argc, 2, 2);
 914                 return get_urlmatch(argv[0], argv[1]);
 915         }
 916         else if (actions == ACTION_UNSET) {
 917                 check_write();
 918                 check_argc(argc, 1, 2);
 919                 if (argc == 2)
 920                         return git_config_set_multivar_in_file_gently(given_config_source.file,
 921                                                                       argv[0], NULL, argv[1],
 922                                                                       flags);
 923                 else
 924                         return git_config_set_in_file_gently(given_config_source.file,
 925                                                              argv[0], NULL);
 926         }
 927         else if (actions == ACTION_UNSET_ALL) {
 928                 check_write();
 929                 check_argc(argc, 1, 2);
 930                 return git_config_set_multivar_in_file_gently(given_config_source.file,
 931                                                               argv[0], NULL, argv[1],
 932                                                               flags | CONFIG_FLAGS_MULTI_REPLACE);
 933         }
 934         else if (actions == ACTION_RENAME_SECTION) {
 935                 int ret;
 936                 check_write();
 937                 check_argc(argc, 2, 2);
 938                 ret = git_config_rename_section_in_file(given_config_source.file,
 939                                                         argv[0], argv[1]);
 940                 if (ret < 0)
 941                         return ret;
 942                 if (ret == 0)
 943                         die(_("no such section: %s"), argv[0]);
 944         }
 945         else if (actions == ACTION_REMOVE_SECTION) {
 946                 int ret;
 947                 check_write();
 948                 check_argc(argc, 1, 1);
 949                 ret = git_config_rename_section_in_file(given_config_source.file,
 950                                                         argv[0], NULL);
 951                 if (ret < 0)
 952                         return ret;
 953                 if (ret == 0)
 954                         die(_("no such section: %s"), argv[0]);
 955         }
 956         else if (actions == ACTION_GET_COLOR) {
 957                 check_argc(argc, 1, 2);
 958                 get_color(argv[0], argv[1]);
 959         }
 960         else if (actions == ACTION_GET_COLORBOOL) {
 961                 check_argc(argc, 1, 2);
 962                 if (argc == 2)
 963                         color_stdout_is_tty = git_config_bool("command line", argv[1]);
 964                 return get_colorbool(argv[0], argc == 2);
 965         }
 966
 967         return 0;
 968 }