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 #include "transport.h"
  15
  16 static const char * const builtin_fetch_usage[] = {
  17         "git fetch [<options>] [<repository> [<refspec>...]]",
  18         "git fetch [<options>] <group>",
  19         "git fetch --multiple [<options>] [<repository> | <group>]...",
  20         "git fetch --all [<options>]",
  21         NULL
  22 };
  23
  24 enum {
  25         TAGS_UNSET = 0,
  26         TAGS_DEFAULT = 1,
  27         TAGS_SET = 2
  28 };
  29
  30 static int all, append, dry_run, force, keep, multiple, prune, update_head_ok, verbosity;
  31 static int progress;
  32 static int tags = TAGS_DEFAULT;
  33 static const char *depth;
  34 static const char *upload_pack;
  35 static struct strbuf default_rla = STRBUF_INIT;
  36 static struct transport *transport;
  37
  38 static struct option builtin_fetch_options[] = {
  39         OPT__VERBOSITY(&verbosity),
  40         OPT_BOOLEAN(0, "all", &all,
  41                     "fetch from all remotes"),
  42         OPT_BOOLEAN('a', "append", &append,
  43                     "append to .git/FETCH_HEAD instead of overwriting"),
  44         OPT_STRING(0, "upload-pack", &upload_pack, "PATH",
  45                    "path to upload pack on remote end"),
  46         OPT_BOOLEAN('f', "force", &force,
  47                     "force overwrite of local branch"),
  48         OPT_BOOLEAN('m', "multiple", &multiple,
  49                     "fetch from multiple remotes"),
  50         OPT_SET_INT('t', "tags", &tags,
  51                     "fetch all tags and associated objects", TAGS_SET),
  52         OPT_SET_INT('n', NULL, &tags,
  53                     "do not fetch all tags (--no-tags)", TAGS_UNSET),
  54         OPT_BOOLEAN('p', "prune", &prune,
  55                     "prune tracking branches no longer on remote"),
  56         OPT_BOOLEAN(0, "dry-run", &dry_run,
  57                     "dry run"),
  58         OPT_BOOLEAN('k', "keep", &keep, "keep downloaded pack"),
  59         OPT_BOOLEAN('u', "update-head-ok", &update_head_ok,
  60                     "allow updating of HEAD ref"),
  61         OPT_BOOLEAN(0, "progress", &progress, "force progress reporting"),
  62         OPT_STRING(0, "depth", &depth, "DEPTH",
  63                    "deepen history of shallow clone"),
  64         OPT_END()
  65 };
  66
  67 static void unlock_pack(void)
  68 {
  69         if (transport)
  70                 transport_unlock_pack(transport);
  71 }
  72
  73 static void unlock_pack_on_signal(int signo)
  74 {
  75         unlock_pack();
  76         sigchain_pop(signo);
  77         raise(signo);
  78 }
  79
  80 static void add_merge_config(struct ref **head,
  81                            const struct ref *remote_refs,
  82                            struct branch *branch,
  83                            struct ref ***tail)
  84 {
  85         int i;
  86
  87         for (i = 0; i < branch->merge_nr; i++) {
  88                 struct ref *rm, **old_tail = *tail;
  89                 struct refspec refspec;
  90
  91                 for (rm = *head; rm; rm = rm->next) {
  92                         if (branch_merge_matches(branch, i, rm->name)) {
  93                                 rm->merge = 1;
  94                                 break;
  95                         }
  96                 }
  97                 if (rm)
  98                         continue;
  99
 100                 /*
 101                  * Not fetched to a tracking branch?  We need to fetch
 102                  * it anyway to allow this branch's "branch.$name.merge"
 103                  * to be honored by 'git pull', but we do not have to
 104                  * fail if branch.$name.merge is misconfigured to point
 105                  * at a nonexisting branch.  If we were indeed called by
 106                  * 'git pull', it will notice the misconfiguration because
 107                  * there is no entry in the resulting FETCH_HEAD marked
 108                  * for merging.
 109                  */
 110                 memset(&refspec, 0, sizeof(refspec));
 111                 refspec.src = branch->merge[i]->src;
 112                 get_fetch_map(remote_refs, &refspec, tail, 1);
 113                 for (rm = *old_tail; rm; rm = rm->next)
 114                         rm->merge = 1;
 115         }
 116 }
 117
 118 static void find_non_local_tags(struct transport *transport,
 119                         struct ref **head,
 120                         struct ref ***tail);
 121
 122 static struct ref *get_ref_map(struct transport *transport,
 123                                struct refspec *refs, int ref_count, int tags,
 124                                int *autotags)
 125 {
 126         int i;
 127         struct ref *rm;
 128         struct ref *ref_map = NULL;
 129         struct ref **tail = &ref_map;
 130
 131         const struct ref *remote_refs = transport_get_remote_refs(transport);
 132
 133         if (ref_count || tags == TAGS_SET) {
 134                 for (i = 0; i < ref_count; i++) {
 135                         get_fetch_map(remote_refs, &refs[i], &tail, 0);
 136                         if (refs[i].dst && refs[i].dst[0])
 137                                 *autotags = 1;
 138                 }
 139                 /* Merge everything on the command line, but not --tags */
 140                 for (rm = ref_map; rm; rm = rm->next)
 141                         rm->merge = 1;
 142                 if (tags == TAGS_SET)
 143                         get_fetch_map(remote_refs, tag_refspec, &tail, 0);
 144         } else {
 145                 /* Use the defaults */
 146                 struct remote *remote = transport->remote;
 147                 struct branch *branch = branch_get(NULL);
 148                 int has_merge = branch_has_merge_config(branch);
 149                 if (remote &&
 150                     (remote->fetch_refspec_nr ||
 151                      (has_merge && !strcmp(branch->remote_name, remote->name)))) {
 152                         for (i = 0; i < remote->fetch_refspec_nr; i++) {
 153                                 get_fetch_map(remote_refs, &remote->fetch[i], &tail, 0);
 154                                 if (remote->fetch[i].dst &&
 155                                     remote->fetch[i].dst[0])
 156                                         *autotags = 1;
 157                                 if (!i && !has_merge && ref_map &&
 158                                     !remote->fetch[0].pattern)
 159                                         ref_map->merge = 1;
 160                         }
 161                         /*
 162                          * if the remote we're fetching from is the same
 163                          * as given in branch.<name>.remote, we add the
 164                          * ref given in branch.<name>.merge, too.
 165                          */
 166                         if (has_merge &&
 167                             !strcmp(branch->remote_name, remote->name))
 168                                 add_merge_config(&ref_map, remote_refs, branch, &tail);
 169                 } else {
 170                         ref_map = get_remote_ref(remote_refs, "HEAD");
 171                         if (!ref_map)
 172                                 die("Couldn't find remote ref HEAD");
 173                         ref_map->merge = 1;
 174                         tail = &ref_map->next;
 175                 }
 176         }
 177         if (tags == TAGS_DEFAULT && *autotags)
 178                 find_non_local_tags(transport, &ref_map, &tail);
 179         ref_remove_duplicates(ref_map);
 180
 181         return ref_map;
 182 }
 183
 184 #define STORE_REF_ERROR_OTHER 1
 185 #define STORE_REF_ERROR_DF_CONFLICT 2
 186
 187 static int s_update_ref(const char *action,
 188                         struct ref *ref,
 189                         int check_old)
 190 {
 191         char msg[1024];
 192         char *rla = getenv("GIT_REFLOG_ACTION");
 193         static struct ref_lock *lock;
 194
 195         if (dry_run)
 196                 return 0;
 197         if (!rla)
 198                 rla = default_rla.buf;
 199         snprintf(msg, sizeof(msg), "%s: %s", rla, action);
 200         lock = lock_any_ref_for_update(ref->name,
 201                                        check_old ? ref->old_sha1 : NULL, 0);
 202         if (!lock)
 203                 return errno == ENOTDIR ? STORE_REF_ERROR_DF_CONFLICT :
 204                                           STORE_REF_ERROR_OTHER;
 205         if (write_ref_sha1(lock, ref->new_sha1, msg) < 0)
 206                 return errno == ENOTDIR ? STORE_REF_ERROR_DF_CONFLICT :
 207                                           STORE_REF_ERROR_OTHER;
 208         return 0;
 209 }
 210
 211 #define REFCOL_WIDTH  10
 212
 213 static int update_local_ref(struct ref *ref,
 214                             const char *remote,
 215                             char *display)
 216 {
 217         struct commit *current = NULL, *updated;
 218         enum object_type type;
 219         struct branch *current_branch = branch_get(NULL);
 220         const char *pretty_ref = prettify_refname(ref->name);
 221
 222         *display = 0;
 223         type = sha1_object_info(ref->new_sha1, NULL);
 224         if (type < 0)
 225                 die("object %s not found", sha1_to_hex(ref->new_sha1));
 226
 227         if (!hashcmp(ref->old_sha1, ref->new_sha1)) {
 228                 if (verbosity > 0)
 229                         sprintf(display, "= %-*s %-*s -> %s", TRANSPORT_SUMMARY_WIDTH,
 230                                 "[up to date]", REFCOL_WIDTH, remote,
 231                                 pretty_ref);
 232                 return 0;
 233         }
 234
 235         if (current_branch &&
 236             !strcmp(ref->name, current_branch->name) &&
 237             !(update_head_ok || is_bare_repository()) &&
 238             !is_null_sha1(ref->old_sha1)) {
 239                 /*
 240                  * If this is the head, and it's not okay to update
 241                  * the head, and the old value of the head isn't empty...
 242                  */
 243                 sprintf(display, "! %-*s %-*s -> %s  (can't fetch in current branch)",
 244                         TRANSPORT_SUMMARY_WIDTH, "[rejected]", REFCOL_WIDTH, remote,
 245                         pretty_ref);
 246                 return 1;
 247         }
 248
 249         if (!is_null_sha1(ref->old_sha1) &&
 250             !prefixcmp(ref->name, "refs/tags/")) {
 251                 int r;
 252                 r = s_update_ref("updating tag", ref, 0);
 253                 sprintf(display, "%c %-*s %-*s -> %s%s", r ? '!' : '-',
 254                         TRANSPORT_SUMMARY_WIDTH, "[tag update]", REFCOL_WIDTH, remote,
 255                         pretty_ref, r ? "  (unable to update local ref)" : "");
 256                 return r;
 257         }
 258
 259         current = lookup_commit_reference_gently(ref->old_sha1, 1);
 260         updated = lookup_commit_reference_gently(ref->new_sha1, 1);
 261         if (!current || !updated) {
 262                 const char *msg;
 263                 const char *what;
 264                 int r;
 265                 if (!strncmp(ref->name, "refs/tags/", 10)) {
 266                         msg = "storing tag";
 267                         what = "[new tag]";
 268                 }
 269                 else {
 270                         msg = "storing head";
 271                         what = "[new branch]";
 272                 }
 273
 274                 r = s_update_ref(msg, ref, 0);
 275                 sprintf(display, "%c %-*s %-*s -> %s%s", r ? '!' : '*',
 276                         TRANSPORT_SUMMARY_WIDTH, what, REFCOL_WIDTH, remote, pretty_ref,
 277                         r ? "  (unable to update local ref)" : "");
 278                 return r;
 279         }
 280
 281         if (in_merge_bases(current, &updated, 1)) {
 282                 char quickref[83];
 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("fast-forward", ref, 1);
 288                 sprintf(display, "%c %-*s %-*s -> %s%s", r ? '!' : ' ',
 289                         TRANSPORT_SUMMARY_WIDTH, quickref, REFCOL_WIDTH, remote,
 290                         pretty_ref, r ? "  (unable to update local ref)" : "");
 291                 return r;
 292         } else if (force || ref->force) {
 293                 char quickref[84];
 294                 int r;
 295                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 296                 strcat(quickref, "...");
 297                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 298                 r = s_update_ref("forced-update", ref, 1);
 299                 sprintf(display, "%c %-*s %-*s -> %s  (%s)", r ? '!' : '+',
 300                         TRANSPORT_SUMMARY_WIDTH, quickref, REFCOL_WIDTH, remote,
 301                         pretty_ref,
 302                         r ? "unable to update local ref" : "forced update");
 303                 return r;
 304         } else {
 305                 sprintf(display, "! %-*s %-*s -> %s  (non-fast-forward)",
 306                         TRANSPORT_SUMMARY_WIDTH, "[rejected]", REFCOL_WIDTH, remote,
 307                         pretty_ref);
 308                 return 1;
 309         }
 310 }
 311
 312 static int store_updated_refs(const char *raw_url, const char *remote_name,
 313                 struct ref *ref_map)
 314 {
 315         FILE *fp;
 316         struct commit *commit;
 317         int url_len, i, note_len, shown_url = 0, rc = 0;
 318         char note[1024];
 319         const char *what, *kind;
 320         struct ref *rm;
 321         char *url, *filename = dry_run ? "/dev/null" : git_path("FETCH_HEAD");
 322
 323         fp = fopen(filename, "a");
 324         if (!fp)
 325                 return error("cannot open %s: %s\n", filename, strerror(errno));
 326
 327         if (raw_url)
 328                 url = transport_anonymize_url(raw_url);
 329         else
 330                 url = xstrdup("foreign");
 331         for (rm = ref_map; rm; rm = rm->next) {
 332                 struct ref *ref = NULL;
 333
 334                 if (rm->peer_ref) {
 335                         ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
 336                         strcpy(ref->name, rm->peer_ref->name);
 337                         hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
 338                         hashcpy(ref->new_sha1, rm->old_sha1);
 339                         ref->force = rm->peer_ref->force;
 340                 }
 341
 342                 commit = lookup_commit_reference_gently(rm->old_sha1, 1);
 343                 if (!commit)
 344                         rm->merge = 0;
 345
 346                 if (!strcmp(rm->name, "HEAD")) {
 347                         kind = "";
 348                         what = "";
 349                 }
 350                 else if (!prefixcmp(rm->name, "refs/heads/")) {
 351                         kind = "branch";
 352                         what = rm->name + 11;
 353                 }
 354                 else if (!prefixcmp(rm->name, "refs/tags/")) {
 355                         kind = "tag";
 356                         what = rm->name + 10;
 357                 }
 358                 else if (!prefixcmp(rm->name, "refs/remotes/")) {
 359                         kind = "remote branch";
 360                         what = rm->name + 13;
 361                 }
 362                 else {
 363                         kind = "";
 364                         what = rm->name;
 365                 }
 366
 367                 url_len = strlen(url);
 368                 for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 369                         ;
 370                 url_len = i + 1;
 371                 if (4 < i && !strncmp(".git", url + i - 3, 4))
 372                         url_len = i - 3;
 373
 374                 note_len = 0;
 375                 if (*what) {
 376                         if (*kind)
 377                                 note_len += sprintf(note + note_len, "%s ",
 378                                                     kind);
 379                         note_len += sprintf(note + note_len, "'%s' of ", what);
 380                 }
 381                 note[note_len] = '\0';
 382                 fprintf(fp, "%s\t%s\t%s",
 383                         sha1_to_hex(commit ? commit->object.sha1 :
 384                                     rm->old_sha1),
 385                         rm->merge ? "" : "not-for-merge",
 386                         note);
 387                 for (i = 0; i < url_len; ++i)
 388                         if ('\n' == url[i])
 389                                 fputs("\\n", fp);
 390                         else
 391                                 fputc(url[i], fp);
 392                 fputc('\n', fp);
 393
 394                 if (ref) {
 395                         rc |= update_local_ref(ref, what, note);
 396                         free(ref);
 397                 } else
 398                         sprintf(note, "* %-*s %-*s -> FETCH_HEAD",
 399                                 TRANSPORT_SUMMARY_WIDTH, *kind ? kind : "branch",
 400                                  REFCOL_WIDTH, *what ? what : "HEAD");
 401                 if (*note) {
 402                         if (verbosity >= 0 && !shown_url) {
 403                                 fprintf(stderr, "From %.*s\n",
 404                                                 url_len, url);
 405                                 shown_url = 1;
 406                         }
 407                         if (verbosity >= 0)
 408                                 fprintf(stderr, " %s\n", note);
 409                 }
 410         }
 411         free(url);
 412         fclose(fp);
 413         if (rc & STORE_REF_ERROR_DF_CONFLICT)
 414                 error("some local refs could not be updated; try running\n"
 415                       " 'git remote prune %s' to remove any old, conflicting "
 416                       "branches", remote_name);
 417         return rc;
 418 }
 419
 420 /*
 421  * We would want to bypass the object transfer altogether if
 422  * everything we are going to fetch already exists and is connected
 423  * locally.
 424  *
 425  * The refs we are going to fetch are in ref_map.  If running
 426  *
 427  *  $ git rev-list --objects --stdin --not --all
 428  *
 429  * (feeding all the refs in ref_map on its standard input)
 430  * does not error out, that means everything reachable from the
 431  * refs we are going to fetch exists and is connected to some of
 432  * our existing refs.
 433  */
 434 static int quickfetch(struct ref *ref_map)
 435 {
 436         struct child_process revlist;
 437         struct ref *ref;
 438         int err;
 439         const char *argv[] = {"rev-list",
 440                 "--quiet", "--objects", "--stdin", "--not", "--all", NULL};
 441
 442         /*
 443          * If we are deepening a shallow clone we already have these
 444          * objects reachable.  Running rev-list here will return with
 445          * a good (0) exit status and we'll bypass the fetch that we
 446          * really need to perform.  Claiming failure now will ensure
 447          * we perform the network exchange to deepen our history.
 448          */
 449         if (depth)
 450                 return -1;
 451
 452         if (!ref_map)
 453                 return 0;
 454
 455         memset(&revlist, 0, sizeof(revlist));
 456         revlist.argv = argv;
 457         revlist.git_cmd = 1;
 458         revlist.no_stdout = 1;
 459         revlist.no_stderr = 1;
 460         revlist.in = -1;
 461
 462         err = start_command(&revlist);
 463         if (err) {
 464                 error("could not run rev-list");
 465                 return err;
 466         }
 467
 468         /*
 469          * If rev-list --stdin encounters an unknown commit, it terminates,
 470          * which will cause SIGPIPE in the write loop below.
 471          */
 472         sigchain_push(SIGPIPE, SIG_IGN);
 473
 474         for (ref = ref_map; ref; ref = ref->next) {
 475                 if (write_in_full(revlist.in, sha1_to_hex(ref->old_sha1), 40) < 0 ||
 476                     write_str_in_full(revlist.in, "\n") < 0) {
 477                         if (errno != EPIPE && errno != EINVAL)
 478                                 error("failed write to rev-list: %s", strerror(errno));
 479                         err = -1;
 480                         break;
 481                 }
 482         }
 483
 484         if (close(revlist.in)) {
 485                 error("failed to close rev-list's stdin: %s", strerror(errno));
 486                 err = -1;
 487         }
 488
 489         sigchain_pop(SIGPIPE);
 490
 491         return finish_command(&revlist) || err;
 492 }
 493
 494 static int fetch_refs(struct transport *transport, struct ref *ref_map)
 495 {
 496         int ret = quickfetch(ref_map);
 497         if (ret)
 498                 ret = transport_fetch_refs(transport, ref_map);
 499         if (!ret)
 500                 ret |= store_updated_refs(transport->url,
 501                                 transport->remote->name,
 502                                 ref_map);
 503         transport_unlock_pack(transport);
 504         return ret;
 505 }
 506
 507 static int prune_refs(struct transport *transport, struct ref *ref_map)
 508 {
 509         int result = 0;
 510         struct ref *ref, *stale_refs = get_stale_heads(transport->remote, ref_map);
 511         const char *dangling_msg = dry_run
 512                 ? "   (%s will become dangling)\n"
 513                 : "   (%s has become dangling)\n";
 514
 515         for (ref = stale_refs; ref; ref = ref->next) {
 516                 if (!dry_run)
 517                         result |= delete_ref(ref->name, NULL, 0);
 518                 if (verbosity >= 0) {
 519                         fprintf(stderr, " x %-*s %-*s -> %s\n",
 520                                 TRANSPORT_SUMMARY_WIDTH, "[deleted]",
 521                                 REFCOL_WIDTH, "(none)", prettify_refname(ref->name));
 522                         warn_dangling_symref(stderr, dangling_msg, ref->name);
 523                 }
 524         }
 525         free_refs(stale_refs);
 526         return result;
 527 }
 528
 529 static int add_existing(const char *refname, const unsigned char *sha1,
 530                         int flag, void *cbdata)
 531 {
 532         struct string_list *list = (struct string_list *)cbdata;
 533         struct string_list_item *item = string_list_insert(list, refname);
 534         item->util = (void *)sha1;
 535         return 0;
 536 }
 537
 538 static int will_fetch(struct ref **head, const unsigned char *sha1)
 539 {
 540         struct ref *rm = *head;
 541         while (rm) {
 542                 if (!hashcmp(rm->old_sha1, sha1))
 543                         return 1;
 544                 rm = rm->next;
 545         }
 546         return 0;
 547 }
 548
 549 static void find_non_local_tags(struct transport *transport,
 550                         struct ref **head,
 551                         struct ref ***tail)
 552 {
 553         struct string_list existing_refs = STRING_LIST_INIT_NODUP;
 554         struct string_list remote_refs = STRING_LIST_INIT_NODUP;
 555         const struct ref *ref;
 556         struct string_list_item *item = NULL;
 557
 558         for_each_ref(add_existing, &existing_refs);
 559         for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
 560                 if (prefixcmp(ref->name, "refs/tags"))
 561                         continue;
 562
 563                 /*
 564                  * The peeled ref always follows the matching base
 565                  * ref, so if we see a peeled ref that we don't want
 566                  * to fetch then we can mark the ref entry in the list
 567                  * as one to ignore by setting util to NULL.
 568                  */
 569                 if (!suffixcmp(ref->name, "^{}")) {
 570                         if (item && !has_sha1_file(ref->old_sha1) &&
 571                             !will_fetch(head, ref->old_sha1) &&
 572                             !has_sha1_file(item->util) &&
 573                             !will_fetch(head, item->util))
 574                                 item->util = NULL;
 575                         item = NULL;
 576                         continue;
 577                 }
 578
 579                 /*
 580                  * If item is non-NULL here, then we previously saw a
 581                  * ref not followed by a peeled reference, so we need
 582                  * to check if it is a lightweight tag that we want to
 583                  * fetch.
 584                  */
 585                 if (item && !has_sha1_file(item->util) &&
 586                     !will_fetch(head, item->util))
 587                         item->util = NULL;
 588
 589                 item = NULL;
 590
 591                 /* skip duplicates and refs that we already have */
 592                 if (string_list_has_string(&remote_refs, ref->name) ||
 593                     string_list_has_string(&existing_refs, ref->name))
 594                         continue;
 595
 596                 item = string_list_insert(&remote_refs, ref->name);
 597                 item->util = (void *)ref->old_sha1;
 598         }
 599         string_list_clear(&existing_refs, 0);
 600
 601         /*
 602          * We may have a final lightweight tag that needs to be
 603          * checked to see if it needs fetching.
 604          */
 605         if (item && !has_sha1_file(item->util) &&
 606             !will_fetch(head, item->util))
 607                 item->util = NULL;
 608
 609         /*
 610          * For all the tags in the remote_refs string list,
 611          * add them to the list of refs to be fetched
 612          */
 613         for_each_string_list_item(item, &remote_refs) {
 614                 /* Unless we have already decided to ignore this item... */
 615                 if (item->util)
 616                 {
 617                         struct ref *rm = alloc_ref(item->string);
 618                         rm->peer_ref = alloc_ref(item->string);
 619                         hashcpy(rm->old_sha1, item->util);
 620                         **tail = rm;
 621                         *tail = &rm->next;
 622                 }
 623         }
 624
 625         string_list_clear(&remote_refs, 0);
 626 }
 627
 628 static void check_not_current_branch(struct ref *ref_map)
 629 {
 630         struct branch *current_branch = branch_get(NULL);
 631
 632         if (is_bare_repository() || !current_branch)
 633                 return;
 634
 635         for (; ref_map; ref_map = ref_map->next)
 636                 if (ref_map->peer_ref && !strcmp(current_branch->refname,
 637                                         ref_map->peer_ref->name))
 638                         die("Refusing to fetch into current branch %s "
 639                             "of non-bare repository", current_branch->refname);
 640 }
 641
 642 static int truncate_fetch_head(void)
 643 {
 644         char *filename = git_path("FETCH_HEAD");
 645         FILE *fp = fopen(filename, "w");
 646
 647         if (!fp)
 648                 return error("cannot open %s: %s\n", filename, strerror(errno));
 649         fclose(fp);
 650         return 0;
 651 }
 652
 653 static int do_fetch(struct transport *transport,
 654                     struct refspec *refs, int ref_count)
 655 {
 656         struct string_list existing_refs = STRING_LIST_INIT_NODUP;
 657         struct string_list_item *peer_item = NULL;
 658         struct ref *ref_map;
 659         struct ref *rm;
 660         int autotags = (transport->remote->fetch_tags == 1);
 661
 662         for_each_ref(add_existing, &existing_refs);
 663
 664         if (tags == TAGS_DEFAULT) {
 665                 if (transport->remote->fetch_tags == 2)
 666                         tags = TAGS_SET;
 667                 if (transport->remote->fetch_tags == -1)
 668                         tags = TAGS_UNSET;
 669         }
 670
 671         if (!transport->get_refs_list || !transport->fetch)
 672                 die("Don't know how to fetch from %s", transport->url);
 673
 674         /* if not appending, truncate FETCH_HEAD */
 675         if (!append && !dry_run) {
 676                 int errcode = truncate_fetch_head();
 677                 if (errcode)
 678                         return errcode;
 679         }
 680
 681         ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
 682         if (!update_head_ok)
 683                 check_not_current_branch(ref_map);
 684
 685         for (rm = ref_map; rm; rm = rm->next) {
 686                 if (rm->peer_ref) {
 687                         peer_item = string_list_lookup(&existing_refs,
 688                                                        rm->peer_ref->name);
 689                         if (peer_item)
 690                                 hashcpy(rm->peer_ref->old_sha1,
 691                                         peer_item->util);
 692                 }
 693         }
 694
 695         if (tags == TAGS_DEFAULT && autotags)
 696                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
 697         if (fetch_refs(transport, ref_map)) {
 698                 free_refs(ref_map);
 699                 return 1;
 700         }
 701         if (prune)
 702                 prune_refs(transport, ref_map);
 703         free_refs(ref_map);
 704
 705         /* if neither --no-tags nor --tags was specified, do automated tag
 706          * following ... */
 707         if (tags == TAGS_DEFAULT && autotags) {
 708                 struct ref **tail = &ref_map;
 709                 ref_map = NULL;
 710                 find_non_local_tags(transport, &ref_map, &tail);
 711                 if (ref_map) {
 712                         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
 713                         transport_set_option(transport, TRANS_OPT_DEPTH, "0");
 714                         fetch_refs(transport, ref_map);
 715                 }
 716                 free_refs(ref_map);
 717         }
 718
 719         return 0;
 720 }
 721
 722 static void set_option(const char *name, const char *value)
 723 {
 724         int r = transport_set_option(transport, name, value);
 725         if (r < 0)
 726                 die("Option \"%s\" value \"%s\" is not valid for %s",
 727                         name, value, transport->url);
 728         if (r > 0)
 729                 warning("Option \"%s\" is ignored for %s\n",
 730                         name, transport->url);
 731 }
 732
 733 static int get_one_remote_for_fetch(struct remote *remote, void *priv)
 734 {
 735         struct string_list *list = priv;
 736         if (!remote->skip_default_update)
 737                 string_list_append(list, remote->name);
 738         return 0;
 739 }
 740
 741 struct remote_group_data {
 742         const char *name;
 743         struct string_list *list;
 744 };
 745
 746 static int get_remote_group(const char *key, const char *value, void *priv)
 747 {
 748         struct remote_group_data *g = priv;
 749
 750         if (!prefixcmp(key, "remotes.") &&
 751                         !strcmp(key + 8, g->name)) {
 752                 /* split list by white space */
 753                 int space = strcspn(value, " \t\n");
 754                 while (*value) {
 755                         if (space > 1) {
 756                                 string_list_append(g->list,
 757                                                    xstrndup(value, space));
 758                         }
 759                         value += space + (value[space] != '\0');
 760                         space = strcspn(value, " \t\n");
 761                 }
 762         }
 763
 764         return 0;
 765 }
 766
 767 static int add_remote_or_group(const char *name, struct string_list *list)
 768 {
 769         int prev_nr = list->nr;
 770         struct remote_group_data g;
 771         g.name = name; g.list = list;
 772
 773         git_config(get_remote_group, &g);
 774         if (list->nr == prev_nr) {
 775                 struct remote *remote;
 776                 if (!remote_is_configured(name))
 777                         return 0;
 778                 remote = remote_get(name);
 779                 string_list_append(list, remote->name);
 780         }
 781         return 1;
 782 }
 783
 784 static int fetch_multiple(struct string_list *list)
 785 {
 786         int i, result = 0;
 787         const char *argv[11] = { "fetch", "--append" };
 788         int argc = 2;
 789
 790         if (dry_run)
 791                 argv[argc++] = "--dry-run";
 792         if (prune)
 793                 argv[argc++] = "--prune";
 794         if (update_head_ok)
 795                 argv[argc++] = "--update-head-ok";
 796         if (force)
 797                 argv[argc++] = "--force";
 798         if (keep)
 799                 argv[argc++] = "--keep";
 800         if (verbosity >= 2)
 801                 argv[argc++] = "-v";
 802         if (verbosity >= 1)
 803                 argv[argc++] = "-v";
 804         else if (verbosity < 0)
 805                 argv[argc++] = "-q";
 806
 807         if (!append && !dry_run) {
 808                 int errcode = truncate_fetch_head();
 809                 if (errcode)
 810                         return errcode;
 811         }
 812
 813         for (i = 0; i < list->nr; i++) {
 814                 const char *name = list->items[i].string;
 815                 argv[argc] = name;
 816                 argv[argc + 1] = NULL;
 817                 if (verbosity >= 0)
 818                         printf("Fetching %s\n", name);
 819                 if (run_command_v_opt(argv, RUN_GIT_CMD)) {
 820                         error("Could not fetch %s", name);
 821                         result = 1;
 822                 }
 823         }
 824
 825         return result;
 826 }
 827
 828 static int fetch_one(struct remote *remote, int argc, const char **argv)
 829 {
 830         int i;
 831         static const char **refs = NULL;
 832         int ref_nr = 0;
 833         int exit_code;
 834
 835         if (!remote)
 836                 die("No remote repository specified.  Please, specify either a URL or a\n"
 837                     "remote name from which new revisions should be fetched.");
 838
 839         transport = transport_get(remote, NULL);
 840         transport_set_verbosity(transport, verbosity, progress);
 841         if (upload_pack)
 842                 set_option(TRANS_OPT_UPLOADPACK, upload_pack);
 843         if (keep)
 844                 set_option(TRANS_OPT_KEEP, "yes");
 845         if (depth)
 846                 set_option(TRANS_OPT_DEPTH, depth);
 847
 848         if (argc > 0) {
 849                 int j = 0;
 850                 refs = xcalloc(argc + 1, sizeof(const char *));
 851                 for (i = 0; i < argc; i++) {
 852                         if (!strcmp(argv[i], "tag")) {
 853                                 char *ref;
 854                                 i++;
 855                                 if (i >= argc)
 856                                         die("You need to specify a tag name.");
 857                                 ref = xmalloc(strlen(argv[i]) * 2 + 22);
 858                                 strcpy(ref, "refs/tags/");
 859                                 strcat(ref, argv[i]);
 860                                 strcat(ref, ":refs/tags/");
 861                                 strcat(ref, argv[i]);
 862                                 refs[j++] = ref;
 863                         } else
 864                                 refs[j++] = argv[i];
 865                 }
 866                 refs[j] = NULL;
 867                 ref_nr = j;
 868         }
 869
 870         sigchain_push_common(unlock_pack_on_signal);
 871         atexit(unlock_pack);
 872         exit_code = do_fetch(transport,
 873                         parse_fetch_refspec(ref_nr, refs), ref_nr);
 874         transport_disconnect(transport);
 875         transport = NULL;
 876         return exit_code;
 877 }
 878
 879 int cmd_fetch(int argc, const char **argv, const char *prefix)
 880 {
 881         int i;
 882         struct string_list list = STRING_LIST_INIT_NODUP;
 883         struct remote *remote;
 884         int result = 0;
 885
 886         /* Record the command line for the reflog */
 887         strbuf_addstr(&default_rla, "fetch");
 888         for (i = 1; i < argc; i++)
 889                 strbuf_addf(&default_rla, " %s", argv[i]);
 890
 891         argc = parse_options(argc, argv, prefix,
 892                              builtin_fetch_options, builtin_fetch_usage, 0);
 893
 894         if (all) {
 895                 if (argc == 1)
 896                         die("fetch --all does not take a repository argument");
 897                 else if (argc > 1)
 898                         die("fetch --all does not make sense with refspecs");
 899                 (void) for_each_remote(get_one_remote_for_fetch, &list);
 900                 result = fetch_multiple(&list);
 901         } else if (argc == 0) {
 902                 /* No arguments -- use default remote */
 903                 remote = remote_get(NULL);
 904                 result = fetch_one(remote, argc, argv);
 905         } else if (multiple) {
 906                 /* All arguments are assumed to be remotes or groups */
 907                 for (i = 0; i < argc; i++)
 908                         if (!add_remote_or_group(argv[i], &list))
 909                                 die("No such remote or remote group: %s", argv[i]);
 910                 result = fetch_multiple(&list);
 911         } else {
 912                 /* Single remote or group */
 913                 (void) add_remote_or_group(argv[0], &list);
 914                 if (list.nr > 1) {
 915                         /* More than one remote */
 916                         if (argc > 1)
 917                                 die("Fetching a group and specifying refspecs does not make sense");
 918                         result = fetch_multiple(&list);
 919                 } else {
 920                         /* Zero or one remotes */
 921                         remote = remote_get(argv[0]);
 922                         result = fetch_one(remote, argc-1, argv+1);
 923                 }
 924         }
 925
 926         /* All names were strdup()ed or strndup()ed */
 927         list.strdup_strings = 1;
 928         string_list_clear(&list, 0);
 929
 930         return result;
 931 }