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