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