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, dry_run, force, keep, multiple, prune, 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('p', "prune", &prune,
  53                     "prune tracking branches no longer on remote"),
  54         OPT_BOOLEAN(0, "dry-run", &dry_run,
  55                     "dry run"),
  56         OPT_BOOLEAN('k', "keep", &keep, "keep downloaded pack"),
  57         OPT_BOOLEAN('u', "update-head-ok", &update_head_ok,
  58                     "allow updating of HEAD ref"),
  59         OPT_STRING(0, "depth", &depth, "DEPTH",
  60                    "deepen history of shallow clone"),
  61         OPT_END()
  62 };
  63
  64 static void unlock_pack(void)
  65 {
  66         if (transport)
  67                 transport_unlock_pack(transport);
  68 }
  69
  70 static void unlock_pack_on_signal(int signo)
  71 {
  72         unlock_pack();
  73         sigchain_pop(signo);
  74         raise(signo);
  75 }
  76
  77 static void add_merge_config(struct ref **head,
  78                            const struct ref *remote_refs,
  79                            struct branch *branch,
  80                            struct ref ***tail)
  81 {
  82         int i;
  83
  84         for (i = 0; i < branch->merge_nr; i++) {
  85                 struct ref *rm, **old_tail = *tail;
  86                 struct refspec refspec;
  87
  88                 for (rm = *head; rm; rm = rm->next) {
  89                         if (branch_merge_matches(branch, i, rm->name)) {
  90                                 rm->merge = 1;
  91                                 break;
  92                         }
  93                 }
  94                 if (rm)
  95                         continue;
  96
  97                 /*
  98                  * Not fetched to a tracking branch?  We need to fetch
  99                  * it anyway to allow this branch's "branch.$name.merge"
 100                  * to be honored by 'git pull', but we do not have to
 101                  * fail if branch.$name.merge is misconfigured to point
 102                  * at a nonexisting branch.  If we were indeed called by
 103                  * 'git pull', it will notice the misconfiguration because
 104                  * there is no entry in the resulting FETCH_HEAD marked
 105                  * for merging.
 106                  */
 107                 refspec.src = branch->merge[i]->src;
 108                 refspec.dst = NULL;
 109                 refspec.pattern = 0;
 110                 refspec.force = 0;
 111                 get_fetch_map(remote_refs, &refspec, tail, 1);
 112                 for (rm = *old_tail; rm; rm = rm->next)
 113                         rm->merge = 1;
 114         }
 115 }
 116
 117 static void find_non_local_tags(struct transport *transport,
 118                         struct ref **head,
 119                         struct ref ***tail);
 120
 121 static struct ref *get_ref_map(struct transport *transport,
 122                                struct refspec *refs, int ref_count, int tags,
 123                                int *autotags)
 124 {
 125         int i;
 126         struct ref *rm;
 127         struct ref *ref_map = NULL;
 128         struct ref **tail = &ref_map;
 129
 130         const struct ref *remote_refs = transport_get_remote_refs(transport);
 131
 132         if (ref_count || tags == TAGS_SET) {
 133                 for (i = 0; i < ref_count; i++) {
 134                         get_fetch_map(remote_refs, &refs[i], &tail, 0);
 135                         if (refs[i].dst && refs[i].dst[0])
 136                                 *autotags = 1;
 137                 }
 138                 /* Merge everything on the command line, but not --tags */
 139                 for (rm = ref_map; rm; rm = rm->next)
 140                         rm->merge = 1;
 141                 if (tags == TAGS_SET)
 142                         get_fetch_map(remote_refs, tag_refspec, &tail, 0);
 143         } else {
 144                 /* Use the defaults */
 145                 struct remote *remote = transport->remote;
 146                 struct branch *branch = branch_get(NULL);
 147                 int has_merge = branch_has_merge_config(branch);
 148                 if (remote && (remote->fetch_refspec_nr || has_merge)) {
 149                         for (i = 0; i < remote->fetch_refspec_nr; i++) {
 150                                 get_fetch_map(remote_refs, &remote->fetch[i], &tail, 0);
 151                                 if (remote->fetch[i].dst &&
 152                                     remote->fetch[i].dst[0])
 153                                         *autotags = 1;
 154                                 if (!i && !has_merge && ref_map &&
 155                                     !remote->fetch[0].pattern)
 156                                         ref_map->merge = 1;
 157                         }
 158                         /*
 159                          * if the remote we're fetching from is the same
 160                          * as given in branch.<name>.remote, we add the
 161                          * ref given in branch.<name>.merge, too.
 162                          */
 163                         if (has_merge &&
 164                             !strcmp(branch->remote_name, remote->name))
 165                                 add_merge_config(&ref_map, remote_refs, branch, &tail);
 166                 } else {
 167                         ref_map = get_remote_ref(remote_refs, "HEAD");
 168                         if (!ref_map)
 169                                 die("Couldn't find remote ref HEAD");
 170                         ref_map->merge = 1;
 171                         tail = &ref_map->next;
 172                 }
 173         }
 174         if (tags == TAGS_DEFAULT && *autotags)
 175                 find_non_local_tags(transport, &ref_map, &tail);
 176         ref_remove_duplicates(ref_map);
 177
 178         return ref_map;
 179 }
 180
 181 #define STORE_REF_ERROR_OTHER 1
 182 #define STORE_REF_ERROR_DF_CONFLICT 2
 183
 184 static int s_update_ref(const char *action,
 185                         struct ref *ref,
 186                         int check_old)
 187 {
 188         char msg[1024];
 189         char *rla = getenv("GIT_REFLOG_ACTION");
 190         static struct ref_lock *lock;
 191
 192         if (dry_run)
 193                 return 0;
 194         if (!rla)
 195                 rla = default_rla.buf;
 196         snprintf(msg, sizeof(msg), "%s: %s", rla, action);
 197         lock = lock_any_ref_for_update(ref->name,
 198                                        check_old ? ref->old_sha1 : NULL, 0);
 199         if (!lock)
 200                 return errno == ENOTDIR ? STORE_REF_ERROR_DF_CONFLICT :
 201                                           STORE_REF_ERROR_OTHER;
 202         if (write_ref_sha1(lock, ref->new_sha1, msg) < 0)
 203                 return errno == ENOTDIR ? STORE_REF_ERROR_DF_CONFLICT :
 204                                           STORE_REF_ERROR_OTHER;
 205         return 0;
 206 }
 207
 208 #define SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3)
 209 #define REFCOL_WIDTH  10
 210
 211 static int update_local_ref(struct ref *ref,
 212                             const char *remote,
 213                             char *display)
 214 {
 215         struct commit *current = NULL, *updated;
 216         enum object_type type;
 217         struct branch *current_branch = branch_get(NULL);
 218         const char *pretty_ref = prettify_refname(ref->name);
 219
 220         *display = 0;
 221         type = sha1_object_info(ref->new_sha1, NULL);
 222         if (type < 0)
 223                 die("object %s not found", sha1_to_hex(ref->new_sha1));
 224
 225         if (!hashcmp(ref->old_sha1, ref->new_sha1)) {
 226                 if (verbosity > 0)
 227                         sprintf(display, "= %-*s %-*s -> %s", SUMMARY_WIDTH,
 228                                 "[up to date]", REFCOL_WIDTH, remote,
 229                                 pretty_ref);
 230                 return 0;
 231         }
 232
 233         if (current_branch &&
 234             !strcmp(ref->name, current_branch->name) &&
 235             !(update_head_ok || is_bare_repository()) &&
 236             !is_null_sha1(ref->old_sha1)) {
 237                 /*
 238                  * If this is the head, and it's not okay to update
 239                  * the head, and the old value of the head isn't empty...
 240                  */
 241                 sprintf(display, "! %-*s %-*s -> %s  (can't fetch in current branch)",
 242                         SUMMARY_WIDTH, "[rejected]", REFCOL_WIDTH, remote,
 243                         pretty_ref);
 244                 return 1;
 245         }
 246
 247         if (!is_null_sha1(ref->old_sha1) &&
 248             !prefixcmp(ref->name, "refs/tags/")) {
 249                 int r;
 250                 r = s_update_ref("updating tag", ref, 0);
 251                 sprintf(display, "%c %-*s %-*s -> %s%s", r ? '!' : '-',
 252                         SUMMARY_WIDTH, "[tag update]", REFCOL_WIDTH, remote,
 253                         pretty_ref, r ? "  (unable to update local ref)" : "");
 254                 return r;
 255         }
 256
 257         current = lookup_commit_reference_gently(ref->old_sha1, 1);
 258         updated = lookup_commit_reference_gently(ref->new_sha1, 1);
 259         if (!current || !updated) {
 260                 const char *msg;
 261                 const char *what;
 262                 int r;
 263                 if (!strncmp(ref->name, "refs/tags/", 10)) {
 264                         msg = "storing tag";
 265                         what = "[new tag]";
 266                 }
 267                 else {
 268                         msg = "storing head";
 269                         what = "[new branch]";
 270                 }
 271
 272                 r = s_update_ref(msg, ref, 0);
 273                 sprintf(display, "%c %-*s %-*s -> %s%s", r ? '!' : '*',
 274                         SUMMARY_WIDTH, what, REFCOL_WIDTH, remote, pretty_ref,
 275                         r ? "  (unable to update local ref)" : "");
 276                 return r;
 277         }
 278
 279         if (in_merge_bases(current, &updated, 1)) {
 280                 char quickref[83];
 281                 int r;
 282                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 283                 strcat(quickref, "..");
 284                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 285                 r = s_update_ref("fast-forward", ref, 1);
 286                 sprintf(display, "%c %-*s %-*s -> %s%s", r ? '!' : ' ',
 287                         SUMMARY_WIDTH, quickref, REFCOL_WIDTH, remote,
 288                         pretty_ref, r ? "  (unable to update local ref)" : "");
 289                 return r;
 290         } else if (force || ref->force) {
 291                 char quickref[84];
 292                 int r;
 293                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 294                 strcat(quickref, "...");
 295                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 296                 r = s_update_ref("forced-update", ref, 1);
 297                 sprintf(display, "%c %-*s %-*s -> %s  (%s)", r ? '!' : '+',
 298                         SUMMARY_WIDTH, quickref, REFCOL_WIDTH, remote,
 299                         pretty_ref,
 300                         r ? "unable to update local ref" : "forced update");
 301                 return r;
 302         } else {
 303                 sprintf(display, "! %-*s %-*s -> %s  (non-fast-forward)",
 304                         SUMMARY_WIDTH, "[rejected]", REFCOL_WIDTH, remote,
 305                         pretty_ref);
 306                 return 1;
 307         }
 308 }
 309
 310 static int store_updated_refs(const char *raw_url, const char *remote_name,
 311                 struct ref *ref_map)
 312 {
 313         FILE *fp;
 314         struct commit *commit;
 315         int url_len, i, note_len, shown_url = 0, rc = 0;
 316         char note[1024];
 317         const char *what, *kind;
 318         struct ref *rm;
 319         char *url, *filename = dry_run ? "/dev/null" : git_path("FETCH_HEAD");
 320
 321         fp = fopen(filename, "a");
 322         if (!fp)
 323                 return error("cannot open %s: %s\n", filename, strerror(errno));
 324
 325         url = transport_anonymize_url(raw_url);
 326         for (rm = ref_map; rm; rm = rm->next) {
 327                 struct ref *ref = NULL;
 328
 329                 if (rm->peer_ref) {
 330                         ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
 331                         strcpy(ref->name, rm->peer_ref->name);
 332                         hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
 333                         hashcpy(ref->new_sha1, rm->old_sha1);
 334                         ref->force = rm->peer_ref->force;
 335                 }
 336
 337                 commit = lookup_commit_reference_gently(rm->old_sha1, 1);
 338                 if (!commit)
 339                         rm->merge = 0;
 340
 341                 if (!strcmp(rm->name, "HEAD")) {
 342                         kind = "";
 343                         what = "";
 344                 }
 345                 else if (!prefixcmp(rm->name, "refs/heads/")) {
 346                         kind = "branch";
 347                         what = rm->name + 11;
 348                 }
 349                 else if (!prefixcmp(rm->name, "refs/tags/")) {
 350                         kind = "tag";
 351                         what = rm->name + 10;
 352                 }
 353                 else if (!prefixcmp(rm->name, "refs/remotes/")) {
 354                         kind = "remote branch";
 355                         what = rm->name + 13;
 356                 }
 357                 else {
 358                         kind = "";
 359                         what = rm->name;
 360                 }
 361
 362                 url_len = strlen(url);
 363                 for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 364                         ;
 365                 url_len = i + 1;
 366                 if (4 < i && !strncmp(".git", url + i - 3, 4))
 367                         url_len = i - 3;
 368
 369                 note_len = 0;
 370                 if (*what) {
 371                         if (*kind)
 372                                 note_len += sprintf(note + note_len, "%s ",
 373                                                     kind);
 374                         note_len += sprintf(note + note_len, "'%s' of ", what);
 375                 }
 376                 note[note_len] = '\0';
 377                 fprintf(fp, "%s\t%s\t%s",
 378                         sha1_to_hex(commit ? commit->object.sha1 :
 379                                     rm->old_sha1),
 380                         rm->merge ? "" : "not-for-merge",
 381                         note);
 382                 for (i = 0; i < url_len; ++i)
 383                         if ('\n' == url[i])
 384                                 fputs("\\n", fp);
 385                         else
 386                                 fputc(url[i], fp);
 387                 fputc('\n', fp);
 388
 389                 if (ref)
 390                         rc |= update_local_ref(ref, what, note);
 391                 else
 392                         sprintf(note, "* %-*s %-*s -> FETCH_HEAD",
 393                                 SUMMARY_WIDTH, *kind ? kind : "branch",
 394                                  REFCOL_WIDTH, *what ? what : "HEAD");
 395                 if (*note) {
 396                         if (verbosity >= 0 && !shown_url) {
 397                                 fprintf(stderr, "From %.*s\n",
 398                                                 url_len, url);
 399                                 shown_url = 1;
 400                         }
 401                         if (verbosity >= 0)
 402                                 fprintf(stderr, " %s\n", note);
 403                 }
 404         }
 405         free(url);
 406         fclose(fp);
 407         if (rc & STORE_REF_ERROR_DF_CONFLICT)
 408                 error("some local refs could not be updated; try running\n"
 409                       " 'git remote prune %s' to remove any old, conflicting "
 410                       "branches", remote_name);
 411         return rc;
 412 }
 413
 414 /*
 415  * We would want to bypass the object transfer altogether if
 416  * everything we are going to fetch already exists and is connected
 417  * locally.
 418  *
 419  * The refs we are going to fetch are in ref_map.  If running
 420  *
 421  *  $ git rev-list --objects --stdin --not --all
 422  *
 423  * (feeding all the refs in ref_map on its standard input)
 424  * does not error out, that means everything reachable from the
 425  * refs we are going to fetch exists and is connected to some of
 426  * our existing refs.
 427  */
 428 static int quickfetch(struct ref *ref_map)
 429 {
 430         struct child_process revlist;
 431         struct ref *ref;
 432         int err;
 433         const char *argv[] = {"rev-list",
 434                 "--quiet", "--objects", "--stdin", "--not", "--all", NULL};
 435
 436         /*
 437          * If we are deepening a shallow clone we already have these
 438          * objects reachable.  Running rev-list here will return with
 439          * a good (0) exit status and we'll bypass the fetch that we
 440          * really need to perform.  Claiming failure now will ensure
 441          * we perform the network exchange to deepen our history.
 442          */
 443         if (depth)
 444                 return -1;
 445
 446         if (!ref_map)
 447                 return 0;
 448
 449         memset(&revlist, 0, sizeof(revlist));
 450         revlist.argv = argv;
 451         revlist.git_cmd = 1;
 452         revlist.no_stdout = 1;
 453         revlist.no_stderr = 1;
 454         revlist.in = -1;
 455
 456         err = start_command(&revlist);
 457         if (err) {
 458                 error("could not run rev-list");
 459                 return err;
 460         }
 461
 462         /*
 463          * If rev-list --stdin encounters an unknown commit, it terminates,
 464          * which will cause SIGPIPE in the write loop below.
 465          */
 466         sigchain_push(SIGPIPE, SIG_IGN);
 467
 468         for (ref = ref_map; ref; ref = ref->next) {
 469                 if (write_in_full(revlist.in, sha1_to_hex(ref->old_sha1), 40) < 0 ||
 470                     write_str_in_full(revlist.in, "\n") < 0) {
 471                         if (errno != EPIPE && errno != EINVAL)
 472                                 error("failed write to rev-list: %s", strerror(errno));
 473                         err = -1;
 474                         break;
 475                 }
 476         }
 477
 478         if (close(revlist.in)) {
 479                 error("failed to close rev-list's stdin: %s", strerror(errno));
 480                 err = -1;
 481         }
 482
 483         sigchain_pop(SIGPIPE);
 484
 485         return finish_command(&revlist) || err;
 486 }
 487
 488 static int fetch_refs(struct transport *transport, struct ref *ref_map)
 489 {
 490         int ret = quickfetch(ref_map);
 491         if (ret)
 492                 ret = transport_fetch_refs(transport, ref_map);
 493         if (!ret)
 494                 ret |= store_updated_refs(transport->url,
 495                                 transport->remote->name,
 496                                 ref_map);
 497         transport_unlock_pack(transport);
 498         return ret;
 499 }
 500
 501 static int prune_refs(struct transport *transport, struct ref *ref_map)
 502 {
 503         int result = 0;
 504         struct ref *ref, *stale_refs = get_stale_heads(transport->remote, ref_map);
 505         const char *dangling_msg = dry_run
 506                 ? "   (%s will become dangling)\n"
 507                 : "   (%s has become dangling)\n";
 508
 509         for (ref = stale_refs; ref; ref = ref->next) {
 510                 if (!dry_run)
 511                         result |= delete_ref(ref->name, NULL, 0);
 512                 if (verbosity >= 0) {
 513                         fprintf(stderr, " x %-*s %-*s -> %s\n",
 514                                 SUMMARY_WIDTH, "[deleted]",
 515                                 REFCOL_WIDTH, "(none)", prettify_refname(ref->name));
 516                         warn_dangling_symref(stderr, dangling_msg, ref->name);
 517                 }
 518         }
 519         free_refs(stale_refs);
 520         return result;
 521 }
 522
 523 static int add_existing(const char *refname, const unsigned char *sha1,
 524                         int flag, void *cbdata)
 525 {
 526         struct string_list *list = (struct string_list *)cbdata;
 527         struct string_list_item *item = string_list_insert(refname, list);
 528         item->util = (void *)sha1;
 529         return 0;
 530 }
 531
 532 static int will_fetch(struct ref **head, const unsigned char *sha1)
 533 {
 534         struct ref *rm = *head;
 535         while (rm) {
 536                 if (!hashcmp(rm->old_sha1, sha1))
 537                         return 1;
 538                 rm = rm->next;
 539         }
 540         return 0;
 541 }
 542
 543 struct tag_data {
 544         struct ref **head;
 545         struct ref ***tail;
 546 };
 547
 548 static int add_to_tail(struct string_list_item *item, void *cb_data)
 549 {
 550         struct tag_data *data = (struct tag_data *)cb_data;
 551         struct ref *rm = NULL;
 552
 553         /* We have already decided to ignore this item */
 554         if (!item->util)
 555                 return 0;
 556
 557         rm = alloc_ref(item->string);
 558         rm->peer_ref = alloc_ref(item->string);
 559         hashcpy(rm->old_sha1, item->util);
 560
 561         **data->tail = rm;
 562         *data->tail = &rm->next;
 563
 564         return 0;
 565 }
 566
 567 static void find_non_local_tags(struct transport *transport,
 568                         struct ref **head,
 569                         struct ref ***tail)
 570 {
 571         struct string_list existing_refs = { NULL, 0, 0, 0 };
 572         struct string_list remote_refs = { NULL, 0, 0, 0 };
 573         struct tag_data data = {head, tail};
 574         const struct ref *ref;
 575         struct string_list_item *item = NULL;
 576
 577         for_each_ref(add_existing, &existing_refs);
 578         for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
 579                 if (prefixcmp(ref->name, "refs/tags"))
 580                         continue;
 581
 582                 /*
 583                  * The peeled ref always follows the matching base
 584                  * ref, so if we see a peeled ref that we don't want
 585                  * to fetch then we can mark the ref entry in the list
 586                  * as one to ignore by setting util to NULL.
 587                  */
 588                 if (!strcmp(ref->name + strlen(ref->name) - 3, "^{}")) {
 589                         if (item && !has_sha1_file(ref->old_sha1) &&
 590                             !will_fetch(head, ref->old_sha1) &&
 591                             !has_sha1_file(item->util) &&
 592                             !will_fetch(head, item->util))
 593                                 item->util = NULL;
 594                         item = NULL;
 595                         continue;
 596                 }
 597
 598                 /*
 599                  * If item is non-NULL here, then we previously saw a
 600                  * ref not followed by a peeled reference, so we need
 601                  * to check if it is a lightweight tag that we want to
 602                  * fetch.
 603                  */
 604                 if (item && !has_sha1_file(item->util) &&
 605                     !will_fetch(head, item->util))
 606                         item->util = NULL;
 607
 608                 item = NULL;
 609
 610                 /* skip duplicates and refs that we already have */
 611                 if (string_list_has_string(&remote_refs, ref->name) ||
 612                     string_list_has_string(&existing_refs, ref->name))
 613                         continue;
 614
 615                 item = string_list_insert(ref->name, &remote_refs);
 616                 item->util = (void *)ref->old_sha1;
 617         }
 618         string_list_clear(&existing_refs, 0);
 619
 620         /*
 621          * We may have a final lightweight tag that needs to be
 622          * checked to see if it needs fetching.
 623          */
 624         if (item && !has_sha1_file(item->util) &&
 625             !will_fetch(head, item->util))
 626                 item->util = NULL;
 627
 628         /*
 629          * For all the tags in the remote_refs string list, call
 630          * add_to_tail to add them to the list of refs to be fetched
 631          */
 632         for_each_string_list(add_to_tail, &remote_refs, &data);
 633
 634         string_list_clear(&remote_refs, 0);
 635 }
 636
 637 static void check_not_current_branch(struct ref *ref_map)
 638 {
 639         struct branch *current_branch = branch_get(NULL);
 640
 641         if (is_bare_repository() || !current_branch)
 642                 return;
 643
 644         for (; ref_map; ref_map = ref_map->next)
 645                 if (ref_map->peer_ref && !strcmp(current_branch->refname,
 646                                         ref_map->peer_ref->name))
 647                         die("Refusing to fetch into current branch %s "
 648                             "of non-bare repository", current_branch->refname);
 649 }
 650
 651 static int do_fetch(struct transport *transport,
 652                     struct refspec *refs, int ref_count)
 653 {
 654         struct string_list existing_refs = { NULL, 0, 0, 0 };
 655         struct string_list_item *peer_item = NULL;
 656         struct ref *ref_map;
 657         struct ref *rm;
 658         int autotags = (transport->remote->fetch_tags == 1);
 659
 660         for_each_ref(add_existing, &existing_refs);
 661
 662         if (transport->remote->fetch_tags == 2 && tags != TAGS_UNSET)
 663                 tags = TAGS_SET;
 664         if (transport->remote->fetch_tags == -1)
 665                 tags = TAGS_UNSET;
 666
 667         if (!transport->get_refs_list || !transport->fetch)
 668                 die("Don't know how to fetch from %s", transport->url);
 669
 670         /* if not appending, truncate FETCH_HEAD */
 671         if (!append && !dry_run) {
 672                 char *filename = git_path("FETCH_HEAD");
 673                 FILE *fp = fopen(filename, "w");
 674                 if (!fp)
 675                         return error("cannot open %s: %s\n", filename, strerror(errno));
 676                 fclose(fp);
 677         }
 678
 679         ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
 680         if (!update_head_ok)
 681                 check_not_current_branch(ref_map);
 682
 683         for (rm = ref_map; rm; rm = rm->next) {
 684                 if (rm->peer_ref) {
 685                         peer_item = string_list_lookup(rm->peer_ref->name,
 686                                                        &existing_refs);
 687                         if (peer_item)
 688                                 hashcpy(rm->peer_ref->old_sha1,
 689                                         peer_item->util);
 690                 }
 691         }
 692
 693         if (tags == TAGS_DEFAULT && autotags)
 694                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
 695         if (fetch_refs(transport, ref_map)) {
 696                 free_refs(ref_map);
 697                 return 1;
 698         }
 699         if (prune)
 700                 prune_refs(transport, ref_map);
 701         free_refs(ref_map);
 702
 703         /* if neither --no-tags nor --tags was specified, do automated tag
 704          * following ... */
 705         if (tags == TAGS_DEFAULT && autotags) {
 706                 struct ref **tail = &ref_map;
 707                 ref_map = NULL;
 708                 find_non_local_tags(transport, &ref_map, &tail);
 709                 if (ref_map) {
 710                         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
 711                         transport_set_option(transport, TRANS_OPT_DEPTH, "0");
 712                         fetch_refs(transport, ref_map);
 713                 }
 714                 free_refs(ref_map);
 715         }
 716
 717         return 0;
 718 }
 719
 720 static void set_option(const char *name, const char *value)
 721 {
 722         int r = transport_set_option(transport, name, value);
 723         if (r < 0)
 724                 die("Option \"%s\" value \"%s\" is not valid for %s",
 725                         name, value, transport->url);
 726         if (r > 0)
 727                 warning("Option \"%s\" is ignored for %s\n",
 728                         name, transport->url);
 729 }
 730
 731 static int get_one_remote_for_fetch(struct remote *remote, void *priv)
 732 {
 733         struct string_list *list = priv;
 734         if (!remote->skip_default_update)
 735                 string_list_append(remote->name, list);
 736         return 0;
 737 }
 738
 739 struct remote_group_data {
 740         const char *name;
 741         struct string_list *list;
 742 };
 743
 744 static int get_remote_group(const char *key, const char *value, void *priv)
 745 {
 746         struct remote_group_data *g = priv;
 747
 748         if (!prefixcmp(key, "remotes.") &&
 749                         !strcmp(key + 8, g->name)) {
 750                 /* split list by white space */
 751                 int space = strcspn(value, " \t\n");
 752                 while (*value) {
 753                         if (space > 1) {
 754                                 string_list_append(xstrndup(value, space),
 755                                                    g->list);
 756                         }
 757                         value += space + (value[space] != '\0');
 758                         space = strcspn(value, " \t\n");
 759                 }
 760         }
 761
 762         return 0;
 763 }
 764
 765 static int add_remote_or_group(const char *name, struct string_list *list)
 766 {
 767         int prev_nr = list->nr;
 768         struct remote_group_data g = { name, list };
 769
 770         git_config(get_remote_group, &g);
 771         if (list->nr == prev_nr) {
 772                 struct remote *remote;
 773                 if (!remote_is_configured(name))
 774                         return 0;
 775                 remote = remote_get(name);
 776                 string_list_append(remote->name, list);
 777         }
 778         return 1;
 779 }
 780
 781 static int fetch_multiple(struct string_list *list)
 782 {
 783         int i, result = 0;
 784         const char *argv[] = { "fetch", NULL, NULL, NULL, NULL, NULL, NULL };
 785         int argc = 1;
 786
 787         if (dry_run)
 788                 argv[argc++] = "--dry-run";
 789         if (prune)
 790                 argv[argc++] = "--prune";
 791         if (verbosity >= 2)
 792                 argv[argc++] = "-v";
 793         if (verbosity >= 1)
 794                 argv[argc++] = "-v";
 795         else if (verbosity < 0)
 796                 argv[argc++] = "-q";
 797
 798         for (i = 0; i < list->nr; i++) {
 799                 const char *name = list->items[i].string;
 800                 argv[argc] = name;
 801                 if (verbosity >= 0)
 802                         printf("Fetching %s\n", name);
 803                 if (run_command_v_opt(argv, RUN_GIT_CMD)) {
 804                         error("Could not fetch %s", name);
 805                         result = 1;
 806                 }
 807         }
 808
 809         return result;
 810 }
 811
 812 static int fetch_one(struct remote *remote, int argc, const char **argv)
 813 {
 814         int i;
 815         static const char **refs = NULL;
 816         int ref_nr = 0;
 817         int exit_code;
 818
 819         if (!remote)
 820                 die("Where do you want to fetch from today?");
 821
 822         transport = transport_get(remote, remote->url[0]);
 823         if (verbosity >= 2)
 824                 transport->verbose = verbosity <= 3 ? verbosity : 3;
 825         if (verbosity < 0)
 826                 transport->verbose = -1;
 827         if (upload_pack)
 828                 set_option(TRANS_OPT_UPLOADPACK, upload_pack);
 829         if (keep)
 830                 set_option(TRANS_OPT_KEEP, "yes");
 831         if (depth)
 832                 set_option(TRANS_OPT_DEPTH, depth);
 833
 834         if (argc > 0) {
 835                 int j = 0;
 836                 refs = xcalloc(argc + 1, sizeof(const char *));
 837                 for (i = 0; i < argc; i++) {
 838                         if (!strcmp(argv[i], "tag")) {
 839                                 char *ref;
 840                                 i++;
 841                                 if (i >= argc)
 842                                         die("You need to specify a tag name.");
 843                                 ref = xmalloc(strlen(argv[i]) * 2 + 22);
 844                                 strcpy(ref, "refs/tags/");
 845                                 strcat(ref, argv[i]);
 846                                 strcat(ref, ":refs/tags/");
 847                                 strcat(ref, argv[i]);
 848                                 refs[j++] = ref;
 849                         } else
 850                                 refs[j++] = argv[i];
 851                 }
 852                 refs[j] = NULL;
 853                 ref_nr = j;
 854         }
 855
 856         sigchain_push_common(unlock_pack_on_signal);
 857         atexit(unlock_pack);
 858         exit_code = do_fetch(transport,
 859                         parse_fetch_refspec(ref_nr, refs), ref_nr);
 860         transport_disconnect(transport);
 861         transport = NULL;
 862         return exit_code;
 863 }
 864
 865 int cmd_fetch(int argc, const char **argv, const char *prefix)
 866 {
 867         int i;
 868         struct string_list list = { NULL, 0, 0, 0 };
 869         struct remote *remote;
 870         int result = 0;
 871
 872         /* Record the command line for the reflog */
 873         strbuf_addstr(&default_rla, "fetch");
 874         for (i = 1; i < argc; i++)
 875                 strbuf_addf(&default_rla, " %s", argv[i]);
 876
 877         argc = parse_options(argc, argv, prefix,
 878                              builtin_fetch_options, builtin_fetch_usage, 0);
 879
 880         if (all) {
 881                 if (argc == 1)
 882                         die("fetch --all does not take a repository argument");
 883                 else if (argc > 1)
 884                         die("fetch --all does not make sense with refspecs");
 885                 (void) for_each_remote(get_one_remote_for_fetch, &list);
 886                 result = fetch_multiple(&list);
 887         } else if (argc == 0) {
 888                 /* No arguments -- use default remote */
 889                 remote = remote_get(NULL);
 890                 result = fetch_one(remote, argc, argv);
 891         } else if (multiple) {
 892                 /* All arguments are assumed to be remotes or groups */
 893                 for (i = 0; i < argc; i++)
 894                         if (!add_remote_or_group(argv[i], &list))
 895                                 die("No such remote or remote group: %s", argv[i]);
 896                 result = fetch_multiple(&list);
 897         } else {
 898                 /* Single remote or group */
 899                 (void) add_remote_or_group(argv[0], &list);
 900                 if (list.nr > 1) {
 901                         /* More than one remote */
 902                         if (argc > 1)
 903                                 die("Fetching a group and specifying refspecs does not make sense");
 904                         result = fetch_multiple(&list);
 905                 } else {
 906                         /* Zero or one remotes */
 907                         remote = remote_get(argv[0]);
 908                         result = fetch_one(remote, argc-1, argv+1);
 909                 }
 910         }
 911
 912         /* All names were strdup()ed or strndup()ed */
 913         list.strdup_strings = 1;
 914         string_list_clear(&list, 0);
 915
 916         return result;
 917 }