git.oblomov.eu Git - git/blob - builtin-fetch.c

   1 /*
   2  * "git fetch"
   3  */
   4 #include "cache.h"
   5 #include "refs.h"
   6 #include "commit.h"
   7 #include "builtin.h"
   8 #include "string-list.h"
   9 #include "remote.h"
  10 #include "transport.h"
  11 #include "run-command.h"
  12 #include "parse-options.h"
  13 #include "sigchain.h"
  14
  15 static const char * const builtin_fetch_usage[] = {
  16         "git fetch [options] [<repository> <refspec>...]",
  17         "git fetch [options] <group>",
  18         "git fetch --multiple [options] [<repository> | <group>]...",
  19         "git fetch --all [options]",
  20         NULL
  21 };
  22
  23 enum {
  24         TAGS_UNSET = 0,
  25         TAGS_DEFAULT = 1,
  26         TAGS_SET = 2
  27 };
  28
  29 static int all, append, force, keep, multiple, update_head_ok, verbosity;
  30 static int tags = TAGS_DEFAULT;
  31 static const char *depth;
  32 static const char *upload_pack;
  33 static struct strbuf default_rla = STRBUF_INIT;
  34 static struct transport *transport;
  35
  36 static struct option builtin_fetch_options[] = {
  37         OPT__VERBOSITY(&verbosity),
  38         OPT_BOOLEAN(0, "all", &all,
  39                     "fetch from all remotes"),
  40         OPT_BOOLEAN('a', "append", &append,
  41                     "append to .git/FETCH_HEAD instead of overwriting"),
  42         OPT_STRING(0, "upload-pack", &upload_pack, "PATH",
  43                    "path to upload pack on remote end"),
  44         OPT_BOOLEAN('f', "force", &force,
  45                     "force overwrite of local branch"),
  46         OPT_BOOLEAN('m', "multiple", &multiple,
  47                     "fetch from multiple remotes"),
  48         OPT_SET_INT('t', "tags", &tags,
  49                     "fetch all tags and associated objects", TAGS_SET),
  50         OPT_SET_INT('n', NULL, &tags,
  51                     "do not fetch all tags (--no-tags)", TAGS_UNSET),
  52         OPT_BOOLEAN('k', "keep", &keep, "keep downloaded pack"),
  53         OPT_BOOLEAN('u', "update-head-ok", &update_head_ok,
  54                     "allow updating of HEAD ref"),
  55         OPT_STRING(0, "depth", &depth, "DEPTH",
  56                    "deepen history of shallow clone"),
  57         OPT_END()
  58 };
  59
  60 static void unlock_pack(void)
  61 {
  62         if (transport)
  63                 transport_unlock_pack(transport);
  64 }
  65
  66 static void unlock_pack_on_signal(int signo)
  67 {
  68         unlock_pack();
  69         sigchain_pop(signo);
  70         raise(signo);
  71 }
  72
  73 static void add_merge_config(struct ref **head,
  74                            const struct ref *remote_refs,
  75                            struct branch *branch,
  76                            struct ref ***tail)
  77 {
  78         int i;
  79
  80         for (i = 0; i < branch->merge_nr; i++) {
  81                 struct ref *rm, **old_tail = *tail;
  82                 struct refspec refspec;
  83
  84                 for (rm = *head; rm; rm = rm->next) {
  85                         if (branch_merge_matches(branch, i, rm->name)) {
  86                                 rm->merge = 1;
  87                                 break;
  88                         }
  89                 }
  90                 if (rm)
  91                         continue;
  92
  93                 /*
  94                  * Not fetched to a tracking branch?  We need to fetch
  95                  * it anyway to allow this branch's "branch.$name.merge"
  96                  * to be honored by 'git pull', but we do not have to
  97                  * fail if branch.$name.merge is misconfigured to point
  98                  * at a nonexisting branch.  If we were indeed called by
  99                  * 'git pull', it will notice the misconfiguration because
 100                  * there is no entry in the resulting FETCH_HEAD marked
 101                  * for merging.
 102                  */
 103                 refspec.src = branch->merge[i]->src;
 104                 refspec.dst = NULL;
 105                 refspec.pattern = 0;
 106                 refspec.force = 0;
 107                 get_fetch_map(remote_refs, &refspec, tail, 1);
 108                 for (rm = *old_tail; rm; rm = rm->next)
 109                         rm->merge = 1;
 110         }
 111 }
 112
 113 static void find_non_local_tags(struct transport *transport,
 114                         struct ref **head,
 115                         struct ref ***tail);
 116
 117 static struct ref *get_ref_map(struct transport *transport,
 118                                struct refspec *refs, int ref_count, int tags,
 119                                int *autotags)
 120 {
 121         int i;
 122         struct ref *rm;
 123         struct ref *ref_map = NULL;
 124         struct ref **tail = &ref_map;
 125
 126         const struct ref *remote_refs = transport_get_remote_refs(transport);
 127
 128         if (ref_count || tags == TAGS_SET) {
 129                 for (i = 0; i < ref_count; i++) {
 130                         get_fetch_map(remote_refs, &refs[i], &tail, 0);
 131                         if (refs[i].dst && refs[i].dst[0])
 132                                 *autotags = 1;
 133                 }
 134                 /* Merge everything on the command line, but not --tags */
 135                 for (rm = ref_map; rm; rm = rm->next)
 136                         rm->merge = 1;
 137                 if (tags == TAGS_SET)
 138                         get_fetch_map(remote_refs, tag_refspec, &tail, 0);
 139         } else {
 140                 /* Use the defaults */
 141                 struct remote *remote = transport->remote;
 142                 struct branch *branch = branch_get(NULL);
 143                 int has_merge = branch_has_merge_config(branch);
 144                 if (remote && (remote->fetch_refspec_nr || has_merge)) {
 145                         for (i = 0; i < remote->fetch_refspec_nr; i++) {
 146                                 get_fetch_map(remote_refs, &remote->fetch[i], &tail, 0);
 147                                 if (remote->fetch[i].dst &&
 148                                     remote->fetch[i].dst[0])
 149                                         *autotags = 1;
 150                                 if (!i && !has_merge && ref_map &&
 151                                     !remote->fetch[0].pattern)
 152                                         ref_map->merge = 1;
 153                         }
 154                         /*
 155                          * if the remote we're fetching from is the same
 156                          * as given in branch.<name>.remote, we add the
 157                          * ref given in branch.<name>.merge, too.
 158                          */
 159                         if (has_merge &&
 160                             !strcmp(branch->remote_name, remote->name))
 161                                 add_merge_config(&ref_map, remote_refs, branch, &tail);
 162                 } else {
 163                         ref_map = get_remote_ref(remote_refs, "HEAD");
 164                         if (!ref_map)
 165                                 die("Couldn't find remote ref HEAD");
 166                         ref_map->merge = 1;
 167                         tail = &ref_map->next;
 168                 }
 169         }
 170         if (tags == TAGS_DEFAULT && *autotags)
 171                 find_non_local_tags(transport, &ref_map, &tail);
 172         ref_remove_duplicates(ref_map);
 173
 174         return ref_map;
 175 }
 176
 177 #define STORE_REF_ERROR_OTHER 1
 178 #define STORE_REF_ERROR_DF_CONFLICT 2
 179
 180 static int s_update_ref(const char *action,
 181                         struct ref *ref,
 182                         int check_old)
 183 {
 184         char msg[1024];
 185         char *rla = getenv("GIT_REFLOG_ACTION");
 186         static struct ref_lock *lock;
 187
 188         if (!rla)
 189                 rla = default_rla.buf;
 190         snprintf(msg, sizeof(msg), "%s: %s", rla, action);
 191         lock = lock_any_ref_for_update(ref->name,
 192                                        check_old ? ref->old_sha1 : NULL, 0);
 193         if (!lock)
 194                 return errno == ENOTDIR ? STORE_REF_ERROR_DF_CONFLICT :
 195                                           STORE_REF_ERROR_OTHER;
 196         if (write_ref_sha1(lock, ref->new_sha1, msg) < 0)
 197                 return errno == ENOTDIR ? STORE_REF_ERROR_DF_CONFLICT :
 198                                           STORE_REF_ERROR_OTHER;
 199         return 0;
 200 }
 201
 202 #define SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3)
 203 #define REFCOL_WIDTH  10
 204
 205 static int update_local_ref(struct ref *ref,
 206                             const char *remote,
 207                             char *display)
 208 {
 209         struct commit *current = NULL, *updated;
 210         enum object_type type;
 211         struct branch *current_branch = branch_get(NULL);
 212         const char *pretty_ref = prettify_refname(ref->name);
 213
 214         *display = 0;
 215         type = sha1_object_info(ref->new_sha1, NULL);
 216         if (type < 0)
 217                 die("object %s not found", sha1_to_hex(ref->new_sha1));
 218
 219         if (!hashcmp(ref->old_sha1, ref->new_sha1)) {
 220                 if (verbosity > 0)
 221                         sprintf(display, "= %-*s %-*s -> %s", SUMMARY_WIDTH,
 222                                 "[up to date]", REFCOL_WIDTH, remote,
 223                                 pretty_ref);
 224                 return 0;
 225         }
 226
 227         if (current_branch &&
 228             !strcmp(ref->name, current_branch->name) &&
 229             !(update_head_ok || is_bare_repository()) &&
 230             !is_null_sha1(ref->old_sha1)) {
 231                 /*
 232                  * If this is the head, and it's not okay to update
 233                  * the head, and the old value of the head isn't empty...
 234                  */
 235                 sprintf(display, "! %-*s %-*s -> %s  (can't fetch in current branch)",
 236                         SUMMARY_WIDTH, "[rejected]", REFCOL_WIDTH, remote,
 237                         pretty_ref);
 238                 return 1;
 239         }
 240
 241         if (!is_null_sha1(ref->old_sha1) &&
 242             !prefixcmp(ref->name, "refs/tags/")) {
 243                 int r;
 244                 r = s_update_ref("updating tag", ref, 0);
 245                 sprintf(display, "%c %-*s %-*s -> %s%s", r ? '!' : '-',
 246                         SUMMARY_WIDTH, "[tag update]", REFCOL_WIDTH, remote,
 247                         pretty_ref, r ? "  (unable to update local ref)" : "");
 248                 return r;
 249         }
 250
 251         current = lookup_commit_reference_gently(ref->old_sha1, 1);
 252         updated = lookup_commit_reference_gently(ref->new_sha1, 1);
 253         if (!current || !updated) {
 254                 const char *msg;
 255                 const char *what;
 256                 int r;
 257                 if (!strncmp(ref->name, "refs/tags/", 10)) {
 258                         msg = "storing tag";
 259                         what = "[new tag]";
 260                 }
 261                 else {
 262                         msg = "storing head";
 263                         what = "[new branch]";
 264                 }
 265
 266                 r = s_update_ref(msg, ref, 0);
 267                 sprintf(display, "%c %-*s %-*s -> %s%s", r ? '!' : '*',
 268                         SUMMARY_WIDTH, what, REFCOL_WIDTH, remote, pretty_ref,
 269                         r ? "  (unable to update local ref)" : "");
 270                 return r;
 271         }
 272
 273         if (in_merge_bases(current, &updated, 1)) {
 274                 char quickref[83];
 275                 int r;
 276                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 277                 strcat(quickref, "..");
 278                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 279                 r = s_update_ref("fast forward", ref, 1);
 280                 sprintf(display, "%c %-*s %-*s -> %s%s", r ? '!' : ' ',
 281                         SUMMARY_WIDTH, quickref, REFCOL_WIDTH, remote,
 282                         pretty_ref, r ? "  (unable to update local ref)" : "");
 283                 return r;
 284         } else if (force || ref->force) {
 285                 char quickref[84];
 286                 int r;
 287                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 288                 strcat(quickref, "...");
 289                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 290                 r = s_update_ref("forced-update", ref, 1);
 291                 sprintf(display, "%c %-*s %-*s -> %s  (%s)", r ? '!' : '+',
 292                         SUMMARY_WIDTH, quickref, REFCOL_WIDTH, remote,
 293                         pretty_ref,
 294                         r ? "unable to update local ref" : "forced update");
 295                 return r;
 296         } else {
 297                 sprintf(display, "! %-*s %-*s -> %s  (non fast forward)",
 298                         SUMMARY_WIDTH, "[rejected]", REFCOL_WIDTH, remote,
 299                         pretty_ref);
 300                 return 1;
 301         }
 302 }
 303
 304 static int store_updated_refs(const char *raw_url, const char *remote_name,
 305                 struct ref *ref_map)
 306 {
 307         FILE *fp;
 308         struct commit *commit;
 309         int url_len, i, note_len, shown_url = 0, rc = 0;
 310         char note[1024];
 311         const char *what, *kind;
 312         struct ref *rm;
 313         char *url, *filename = git_path("FETCH_HEAD");
 314
 315         fp = fopen(filename, "a");
 316         if (!fp)
 317                 return error("cannot open %s: %s\n", filename, strerror(errno));
 318
 319         url = transport_anonymize_url(raw_url);
 320         for (rm = ref_map; rm; rm = rm->next) {
 321                 struct ref *ref = NULL;
 322
 323                 if (rm->peer_ref) {
 324                         ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
 325                         strcpy(ref->name, rm->peer_ref->name);
 326                         hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
 327                         hashcpy(ref->new_sha1, rm->old_sha1);
 328                         ref->force = rm->peer_ref->force;
 329                 }
 330
 331                 commit = lookup_commit_reference_gently(rm->old_sha1, 1);
 332                 if (!commit)
 333                         rm->merge = 0;
 334
 335                 if (!strcmp(rm->name, "HEAD")) {
 336                         kind = "";
 337                         what = "";
 338                 }
 339                 else if (!prefixcmp(rm->name, "refs/heads/")) {
 340                         kind = "branch";
 341                         what = rm->name + 11;
 342                 }
 343                 else if (!prefixcmp(rm->name, "refs/tags/")) {
 344                         kind = "tag";
 345                         what = rm->name + 10;
 346                 }
 347                 else if (!prefixcmp(rm->name, "refs/remotes/")) {
 348                         kind = "remote branch";
 349                         what = rm->name + 13;
 350                 }
 351                 else {
 352                         kind = "";
 353                         what = rm->name;
 354                 }
 355
 356                 url_len = strlen(url);
 357                 for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 358                         ;
 359                 url_len = i + 1;
 360                 if (4 < i && !strncmp(".git", url + i - 3, 4))
 361                         url_len = i - 3;
 362
 363                 note_len = 0;
 364                 if (*what) {
 365                         if (*kind)
 366                                 note_len += sprintf(note + note_len, "%s ",
 367                                                     kind);
 368                         note_len += sprintf(note + note_len, "'%s' of ", what);
 369                 }
 370                 note[note_len] = '\0';
 371                 fprintf(fp, "%s\t%s\t%s",
 372                         sha1_to_hex(commit ? commit->object.sha1 :
 373                                     rm->old_sha1),
 374                         rm->merge ? "" : "not-for-merge",
 375                         note);
 376                 for (i = 0; i < url_len; ++i)
 377                         if ('\n' == url[i])
 378                                 fputs("\\n", fp);
 379                         else
 380                                 fputc(url[i], fp);
 381                 fputc('\n', fp);
 382
 383                 if (ref)
 384                         rc |= update_local_ref(ref, what, note);
 385                 else
 386                         sprintf(note, "* %-*s %-*s -> FETCH_HEAD",
 387                                 SUMMARY_WIDTH, *kind ? kind : "branch",
 388                                  REFCOL_WIDTH, *what ? what : "HEAD");
 389                 if (*note) {
 390                         if (verbosity >= 0 && !shown_url) {
 391                                 fprintf(stderr, "From %.*s\n",
 392                                                 url_len, url);
 393                                 shown_url = 1;
 394                         }
 395                         if (verbosity >= 0)
 396                                 fprintf(stderr, " %s\n", note);
 397                 }
 398         }
 399         free(url);
 400         fclose(fp);
 401         if (rc & STORE_REF_ERROR_DF_CONFLICT)
 402                 error("some local refs could not be updated; try running\n"
 403                       " 'git remote prune %s' to remove any old, conflicting "
 404                       "branches", remote_name);
 405         return rc;
 406 }
 407
 408 /*
 409  * We would want to bypass the object transfer altogether if
 410  * everything we are going to fetch already exists and is connected
 411  * locally.
 412  *
 413  * The refs we are going to fetch are in ref_map.  If running
 414  *
 415  *  $ git rev-list --objects --stdin --not --all
 416  *
 417  * (feeding all the refs in ref_map on its standard input)
 418  * does not error out, that means everything reachable from the
 419  * refs we are going to fetch exists and is connected to some of
 420  * our existing refs.
 421  */
 422 static int quickfetch(struct ref *ref_map)
 423 {
 424         struct child_process revlist;
 425         struct ref *ref;
 426         int err;
 427         const char *argv[] = {"rev-list",
 428                 "--quiet", "--objects", "--stdin", "--not", "--all", NULL};
 429
 430         /*
 431          * If we are deepening a shallow clone we already have these
 432          * objects reachable.  Running rev-list here will return with
 433          * a good (0) exit status and we'll bypass the fetch that we
 434          * really need to perform.  Claiming failure now will ensure
 435          * we perform the network exchange to deepen our history.
 436          */
 437         if (depth)
 438                 return -1;
 439
 440         if (!ref_map)
 441                 return 0;
 442
 443         memset(&revlist, 0, sizeof(revlist));
 444         revlist.argv = argv;
 445         revlist.git_cmd = 1;
 446         revlist.no_stdout = 1;
 447         revlist.no_stderr = 1;
 448         revlist.in = -1;
 449
 450         err = start_command(&revlist);
 451         if (err) {
 452                 error("could not run rev-list");
 453                 return err;
 454         }
 455
 456         /*
 457          * If rev-list --stdin encounters an unknown commit, it terminates,
 458          * which will cause SIGPIPE in the write loop below.
 459          */
 460         sigchain_push(SIGPIPE, SIG_IGN);
 461
 462         for (ref = ref_map; ref; ref = ref->next) {
 463                 if (write_in_full(revlist.in, sha1_to_hex(ref->old_sha1), 40) < 0 ||
 464                     write_str_in_full(revlist.in, "\n") < 0) {
 465                         if (errno != EPIPE && errno != EINVAL)
 466                                 error("failed write to rev-list: %s", strerror(errno));
 467                         err = -1;
 468                         break;
 469                 }
 470         }
 471
 472         if (close(revlist.in)) {
 473                 error("failed to close rev-list's stdin: %s", strerror(errno));
 474                 err = -1;
 475         }
 476
 477         sigchain_pop(SIGPIPE);
 478
 479         return finish_command(&revlist) || err;
 480 }
 481
 482 static int fetch_refs(struct transport *transport, struct ref *ref_map)
 483 {
 484         int ret = quickfetch(ref_map);
 485         if (ret)
 486                 ret = transport_fetch_refs(transport, ref_map);
 487         if (!ret)
 488                 ret |= store_updated_refs(transport->url,
 489                                 transport->remote->name,
 490                                 ref_map);
 491         transport_unlock_pack(transport);
 492         return ret;
 493 }
 494
 495 static int add_existing(const char *refname, const unsigned char *sha1,
 496                         int flag, void *cbdata)
 497 {
 498         struct string_list *list = (struct string_list *)cbdata;
 499         string_list_insert(refname, list);
 500         return 0;
 501 }
 502
 503 static int will_fetch(struct ref **head, const unsigned char *sha1)
 504 {
 505         struct ref *rm = *head;
 506         while (rm) {
 507                 if (!hashcmp(rm->old_sha1, sha1))
 508                         return 1;
 509                 rm = rm->next;
 510         }
 511         return 0;
 512 }
 513
 514 static void find_non_local_tags(struct transport *transport,
 515                         struct ref **head,
 516                         struct ref ***tail)
 517 {
 518         struct string_list existing_refs = { NULL, 0, 0, 0 };
 519         struct string_list new_refs = { NULL, 0, 0, 1 };
 520         char *ref_name;
 521         int ref_name_len;
 522         const unsigned char *ref_sha1;
 523         const struct ref *tag_ref;
 524         struct ref *rm = NULL;
 525         const struct ref *ref;
 526
 527         for_each_ref(add_existing, &existing_refs);
 528         for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
 529                 if (prefixcmp(ref->name, "refs/tags"))
 530                         continue;
 531
 532                 ref_name = xstrdup(ref->name);
 533                 ref_name_len = strlen(ref_name);
 534                 ref_sha1 = ref->old_sha1;
 535
 536                 if (!strcmp(ref_name + ref_name_len - 3, "^{}")) {
 537                         ref_name[ref_name_len - 3] = 0;
 538                         tag_ref = transport_get_remote_refs(transport);
 539                         while (tag_ref) {
 540                                 if (!strcmp(tag_ref->name, ref_name)) {
 541                                         ref_sha1 = tag_ref->old_sha1;
 542                                         break;
 543                                 }
 544                                 tag_ref = tag_ref->next;
 545                         }
 546                 }
 547
 548                 if (!string_list_has_string(&existing_refs, ref_name) &&
 549                     !string_list_has_string(&new_refs, ref_name) &&
 550                     (has_sha1_file(ref->old_sha1) ||
 551                      will_fetch(head, ref->old_sha1))) {
 552                         string_list_insert(ref_name, &new_refs);
 553
 554                         rm = alloc_ref(ref_name);
 555                         rm->peer_ref = alloc_ref(ref_name);
 556                         hashcpy(rm->old_sha1, ref_sha1);
 557
 558                         **tail = rm;
 559                         *tail = &rm->next;
 560                 }
 561                 free(ref_name);
 562         }
 563         string_list_clear(&existing_refs, 0);
 564         string_list_clear(&new_refs, 0);
 565 }
 566
 567 static void check_not_current_branch(struct ref *ref_map)
 568 {
 569         struct branch *current_branch = branch_get(NULL);
 570
 571         if (is_bare_repository() || !current_branch)
 572                 return;
 573
 574         for (; ref_map; ref_map = ref_map->next)
 575                 if (ref_map->peer_ref && !strcmp(current_branch->refname,
 576                                         ref_map->peer_ref->name))
 577                         die("Refusing to fetch into current branch %s "
 578                             "of non-bare repository", current_branch->refname);
 579 }
 580
 581 static int do_fetch(struct transport *transport,
 582                     struct refspec *refs, int ref_count)
 583 {
 584         struct ref *ref_map;
 585         struct ref *rm;
 586         int autotags = (transport->remote->fetch_tags == 1);
 587         if (transport->remote->fetch_tags == 2 && tags != TAGS_UNSET)
 588                 tags = TAGS_SET;
 589         if (transport->remote->fetch_tags == -1)
 590                 tags = TAGS_UNSET;
 591
 592         if (!transport->get_refs_list || !transport->fetch)
 593                 die("Don't know how to fetch from %s", transport->url);
 594
 595         /* if not appending, truncate FETCH_HEAD */
 596         if (!append) {
 597                 char *filename = git_path("FETCH_HEAD");
 598                 FILE *fp = fopen(filename, "w");
 599                 if (!fp)
 600                         return error("cannot open %s: %s\n", filename, strerror(errno));
 601                 fclose(fp);
 602         }
 603
 604         ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
 605         if (!update_head_ok)
 606                 check_not_current_branch(ref_map);
 607
 608         for (rm = ref_map; rm; rm = rm->next) {
 609                 if (rm->peer_ref)
 610                         read_ref(rm->peer_ref->name, rm->peer_ref->old_sha1);
 611         }
 612
 613         if (tags == TAGS_DEFAULT && autotags)
 614                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
 615         if (fetch_refs(transport, ref_map)) {
 616                 free_refs(ref_map);
 617                 return 1;
 618         }
 619         free_refs(ref_map);
 620
 621         /* if neither --no-tags nor --tags was specified, do automated tag
 622          * following ... */
 623         if (tags == TAGS_DEFAULT && autotags) {
 624                 struct ref **tail = &ref_map;
 625                 ref_map = NULL;
 626                 find_non_local_tags(transport, &ref_map, &tail);
 627                 if (ref_map) {
 628                         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
 629                         transport_set_option(transport, TRANS_OPT_DEPTH, "0");
 630                         fetch_refs(transport, ref_map);
 631                 }
 632                 free_refs(ref_map);
 633         }
 634
 635         return 0;
 636 }
 637
 638 static void set_option(const char *name, const char *value)
 639 {
 640         int r = transport_set_option(transport, name, value);
 641         if (r < 0)
 642                 die("Option \"%s\" value \"%s\" is not valid for %s",
 643                         name, value, transport->url);
 644         if (r > 0)
 645                 warning("Option \"%s\" is ignored for %s\n",
 646                         name, transport->url);
 647 }
 648
 649 static int get_one_remote_for_fetch(struct remote *remote, void *priv)
 650 {
 651         struct string_list *list = priv;
 652         string_list_append(remote->name, list);
 653         return 0;
 654 }
 655
 656 struct remote_group_data {
 657         const char *name;
 658         struct string_list *list;
 659 };
 660
 661 static int get_remote_group(const char *key, const char *value, void *priv)
 662 {
 663         struct remote_group_data *g = priv;
 664
 665         if (!prefixcmp(key, "remotes.") &&
 666                         !strcmp(key + 8, g->name)) {
 667                 /* split list by white space */
 668                 int space = strcspn(value, " \t\n");
 669                 while (*value) {
 670                         if (space > 1) {
 671                                 string_list_append(xstrndup(value, space),
 672                                                    g->list);
 673                         }
 674                         value += space + (value[space] != '\0');
 675                         space = strcspn(value, " \t\n");
 676                 }
 677         }
 678
 679         return 0;
 680 }
 681
 682 static int add_remote_or_group(const char *name, struct string_list *list)
 683 {
 684         int prev_nr = list->nr;
 685         struct remote_group_data g = { name, list };
 686
 687         git_config(get_remote_group, &g);
 688         if (list->nr == prev_nr) {
 689                 struct remote *remote;
 690                 if (!remote_is_configured(name))
 691                         return 0;
 692                 remote = remote_get(name);
 693                 string_list_append(remote->name, list);
 694         }
 695         return 1;
 696 }
 697
 698 static int fetch_multiple(struct string_list *list)
 699 {
 700         int i, result = 0;
 701         const char *argv[] = { "fetch", NULL, NULL, NULL, NULL };
 702         int argc = 1;
 703
 704         if (verbosity >= 2)
 705                 argv[argc++] = "-v";
 706         if (verbosity >= 1)
 707                 argv[argc++] = "-v";
 708         else if (verbosity < 0)
 709                 argv[argc++] = "-q";
 710
 711         for (i = 0; i < list->nr; i++) {
 712                 const char *name = list->items[i].string;
 713                 argv[argc] = name;
 714                 if (verbosity >= 0)
 715                         printf("Fetching %s\n", name);
 716                 if (run_command_v_opt(argv, RUN_GIT_CMD)) {
 717                         error("Could not fetch %s", name);
 718                         result = 1;
 719                 }
 720         }
 721
 722         return result;
 723 }
 724
 725 static int fetch_one(struct remote *remote, int argc, const char **argv)
 726 {
 727         int i;
 728         static const char **refs = NULL;
 729         int ref_nr = 0;
 730         int exit_code;
 731
 732         if (!remote)
 733                 die("Where do you want to fetch from today?");
 734
 735         transport = transport_get(remote, remote->url[0]);
 736         if (verbosity >= 2)
 737                 transport->verbose = 1;
 738         if (verbosity < 0)
 739                 transport->verbose = -1;
 740         if (upload_pack)
 741                 set_option(TRANS_OPT_UPLOADPACK, upload_pack);
 742         if (keep)
 743                 set_option(TRANS_OPT_KEEP, "yes");
 744         if (depth)
 745                 set_option(TRANS_OPT_DEPTH, depth);
 746
 747         if (argc > 0) {
 748                 int j = 0;
 749                 refs = xcalloc(argc + 1, sizeof(const char *));
 750                 for (i = 0; i < argc; i++) {
 751                         if (!strcmp(argv[i], "tag")) {
 752                                 char *ref;
 753                                 i++;
 754                                 if (i >= argc)
 755                                         die("You need to specify a tag name.");
 756                                 ref = xmalloc(strlen(argv[i]) * 2 + 22);
 757                                 strcpy(ref, "refs/tags/");
 758                                 strcat(ref, argv[i]);
 759                                 strcat(ref, ":refs/tags/");
 760                                 strcat(ref, argv[i]);
 761                                 refs[j++] = ref;
 762                         } else
 763                                 refs[j++] = argv[i];
 764                 }
 765                 refs[j] = NULL;
 766                 ref_nr = j;
 767         }
 768
 769         sigchain_push_common(unlock_pack_on_signal);
 770         atexit(unlock_pack);
 771         exit_code = do_fetch(transport,
 772                         parse_fetch_refspec(ref_nr, refs), ref_nr);
 773         transport_disconnect(transport);
 774         transport = NULL;
 775         return exit_code;
 776 }
 777
 778 int cmd_fetch(int argc, const char **argv, const char *prefix)
 779 {
 780         int i;
 781         struct string_list list = { NULL, 0, 0, 0 };
 782         struct remote *remote;
 783         int result = 0;
 784
 785         /* Record the command line for the reflog */
 786         strbuf_addstr(&default_rla, "fetch");
 787         for (i = 1; i < argc; i++)
 788                 strbuf_addf(&default_rla, " %s", argv[i]);
 789
 790         argc = parse_options(argc, argv, prefix,
 791                              builtin_fetch_options, builtin_fetch_usage, 0);
 792
 793         if (all) {
 794                 if (argc == 1)
 795                         die("fetch --all does not take a repository argument");
 796                 else if (argc > 1)
 797                         die("fetch --all does not make sense with refspecs");
 798                 (void) for_each_remote(get_one_remote_for_fetch, &list);
 799                 result = fetch_multiple(&list);
 800         } else if (argc == 0) {
 801                 /* No arguments -- use default remote */
 802                 remote = remote_get(NULL);
 803                 result = fetch_one(remote, argc, argv);
 804         } else if (multiple) {
 805                 /* All arguments are assumed to be remotes or groups */
 806                 for (i = 0; i < argc; i++)
 807                         if (!add_remote_or_group(argv[i], &list))
 808                                 die("No such remote or remote group: %s", argv[i]);
 809                 result = fetch_multiple(&list);
 810         } else {
 811                 /* Single remote or group */
 812                 (void) add_remote_or_group(argv[0], &list);
 813                 if (list.nr > 1) {
 814                         /* More than one remote */
 815                         if (argc > 1)
 816                                 die("Fetching a group and specifying refspecs does not make sense");
 817                         result = fetch_multiple(&list);
 818                 } else {
 819                         /* Zero or one remotes */
 820                         remote = remote_get(argv[0]);
 821                         result = fetch_one(remote, argc-1, argv+1);
 822                 }
 823         }
 824
 825         /* All names were strdup()ed or strndup()ed */
 826         list.strdup_strings = 1;
 827         string_list_clear(&list, 0);
 828
 829         return result;
 830 }