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