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