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 #include "submodule.h"
  16
  17 static const char * const builtin_fetch_usage[] = {
  18         "git fetch [<options>] [<repository> [<refspec>...]]",
  19         "git fetch [<options>] <group>",
  20         "git fetch --multiple [<options>] [(<repository> | <group>)...]",
  21         "git fetch --all [<options>]",
  22         NULL
  23 };
  24
  25 enum {
  26         TAGS_UNSET = 0,
  27         TAGS_DEFAULT = 1,
  28         TAGS_SET = 2
  29 };
  30
  31 enum {
  32         RECURSE_SUBMODULES_OFF = 0,
  33         RECURSE_SUBMODULES_DEFAULT = 1,
  34         RECURSE_SUBMODULES_ON = 2
  35 };
  36
  37 static int all, append, dry_run, force, keep, multiple, prune, update_head_ok, verbosity;
  38 static int progress, recurse_submodules = RECURSE_SUBMODULES_DEFAULT;
  39 static int tags = TAGS_DEFAULT;
  40 static const char *depth;
  41 static const char *upload_pack;
  42 static struct strbuf default_rla = STRBUF_INIT;
  43 static struct transport *transport;
  44 static const char *submodule_prefix = "";
  45
  46 static struct option builtin_fetch_options[] = {
  47         OPT__VERBOSITY(&verbosity),
  48         OPT_BOOLEAN(0, "all", &all,
  49                     "fetch from all remotes"),
  50         OPT_BOOLEAN('a', "append", &append,
  51                     "append to .git/FETCH_HEAD instead of overwriting"),
  52         OPT_STRING(0, "upload-pack", &upload_pack, "path",
  53                    "path to upload pack on remote end"),
  54         OPT__FORCE(&force, "force overwrite of local branch"),
  55         OPT_BOOLEAN('m', "multiple", &multiple,
  56                     "fetch from multiple remotes"),
  57         OPT_SET_INT('t', "tags", &tags,
  58                     "fetch all tags and associated objects", TAGS_SET),
  59         OPT_SET_INT('n', NULL, &tags,
  60                     "do not fetch all tags (--no-tags)", TAGS_UNSET),
  61         OPT_BOOLEAN('p', "prune", &prune,
  62                     "prune remote-tracking branches no longer on remote"),
  63         OPT_SET_INT(0, "recurse-submodules", &recurse_submodules,
  64                     "control recursive fetching of submodules",
  65                     RECURSE_SUBMODULES_ON),
  66         OPT_BOOLEAN(0, "dry-run", &dry_run,
  67                     "dry run"),
  68         OPT_BOOLEAN('k', "keep", &keep, "keep downloaded pack"),
  69         OPT_BOOLEAN('u', "update-head-ok", &update_head_ok,
  70                     "allow updating of HEAD ref"),
  71         OPT_BOOLEAN(0, "progress", &progress, "force progress reporting"),
  72         OPT_STRING(0, "depth", &depth, "depth",
  73                    "deepen history of shallow clone"),
  74         { OPTION_STRING, 0, "submodule-prefix", &submodule_prefix, "dir",
  75                    "prepend this to submodule path output", PARSE_OPT_HIDDEN },
  76         OPT_END()
  77 };
  78
  79 static void unlock_pack(void)
  80 {
  81         if (transport)
  82                 transport_unlock_pack(transport);
  83 }
  84
  85 static void unlock_pack_on_signal(int signo)
  86 {
  87         unlock_pack();
  88         sigchain_pop(signo);
  89         raise(signo);
  90 }
  91
  92 static void add_merge_config(struct ref **head,
  93                            const struct ref *remote_refs,
  94                            struct branch *branch,
  95                            struct ref ***tail)
  96 {
  97         int i;
  98
  99         for (i = 0; i < branch->merge_nr; i++) {
 100                 struct ref *rm, **old_tail = *tail;
 101                 struct refspec refspec;
 102
 103                 for (rm = *head; rm; rm = rm->next) {
 104                         if (branch_merge_matches(branch, i, rm->name)) {
 105                                 rm->merge = 1;
 106                                 break;
 107                         }
 108                 }
 109                 if (rm)
 110                         continue;
 111
 112                 /*
 113                  * Not fetched to a remote-tracking branch?  We need to fetch
 114                  * it anyway to allow this branch's "branch.$name.merge"
 115                  * to be honored by 'git pull', but we do not have to
 116                  * fail if branch.$name.merge is misconfigured to point
 117                  * at a nonexisting branch.  If we were indeed called by
 118                  * 'git pull', it will notice the misconfiguration because
 119                  * there is no entry in the resulting FETCH_HEAD marked
 120                  * for merging.
 121                  */
 122                 memset(&refspec, 0, sizeof(refspec));
 123                 refspec.src = branch->merge[i]->src;
 124                 get_fetch_map(remote_refs, &refspec, tail, 1);
 125                 for (rm = *old_tail; rm; rm = rm->next)
 126                         rm->merge = 1;
 127         }
 128 }
 129
 130 static void find_non_local_tags(struct transport *transport,
 131                         struct ref **head,
 132                         struct ref ***tail);
 133
 134 static struct ref *get_ref_map(struct transport *transport,
 135                                struct refspec *refs, int ref_count, int tags,
 136                                int *autotags)
 137 {
 138         int i;
 139         struct ref *rm;
 140         struct ref *ref_map = NULL;
 141         struct ref **tail = &ref_map;
 142
 143         const struct ref *remote_refs = transport_get_remote_refs(transport);
 144
 145         if (ref_count || tags == TAGS_SET) {
 146                 for (i = 0; i < ref_count; i++) {
 147                         get_fetch_map(remote_refs, &refs[i], &tail, 0);
 148                         if (refs[i].dst && refs[i].dst[0])
 149                                 *autotags = 1;
 150                 }
 151                 /* Merge everything on the command line, but not --tags */
 152                 for (rm = ref_map; rm; rm = rm->next)
 153                         rm->merge = 1;
 154                 if (tags == TAGS_SET)
 155                         get_fetch_map(remote_refs, tag_refspec, &tail, 0);
 156         } else {
 157                 /* Use the defaults */
 158                 struct remote *remote = transport->remote;
 159                 struct branch *branch = branch_get(NULL);
 160                 int has_merge = branch_has_merge_config(branch);
 161                 if (remote &&
 162                     (remote->fetch_refspec_nr ||
 163                      /* Note: has_merge implies non-NULL branch->remote_name */
 164                      (has_merge && !strcmp(branch->remote_name, remote->name)))) {
 165                         for (i = 0; i < remote->fetch_refspec_nr; i++) {
 166                                 get_fetch_map(remote_refs, &remote->fetch[i], &tail, 0);
 167                                 if (remote->fetch[i].dst &&
 168                                     remote->fetch[i].dst[0])
 169                                         *autotags = 1;
 170                                 if (!i && !has_merge && ref_map &&
 171                                     !remote->fetch[0].pattern)
 172                                         ref_map->merge = 1;
 173                         }
 174                         /*
 175                          * if the remote we're fetching from is the same
 176                          * as given in branch.<name>.remote, we add the
 177                          * ref given in branch.<name>.merge, too.
 178                          *
 179                          * Note: has_merge implies non-NULL branch->remote_name
 180                          */
 181                         if (has_merge &&
 182                             !strcmp(branch->remote_name, remote->name))
 183                                 add_merge_config(&ref_map, remote_refs, branch, &tail);
 184                 } else {
 185                         ref_map = get_remote_ref(remote_refs, "HEAD");
 186                         if (!ref_map)
 187                                 die("Couldn't find remote ref HEAD");
 188                         ref_map->merge = 1;
 189                         tail = &ref_map->next;
 190                 }
 191         }
 192         if (tags == TAGS_DEFAULT && *autotags)
 193                 find_non_local_tags(transport, &ref_map, &tail);
 194         ref_remove_duplicates(ref_map);
 195
 196         return ref_map;
 197 }
 198
 199 #define STORE_REF_ERROR_OTHER 1
 200 #define STORE_REF_ERROR_DF_CONFLICT 2
 201
 202 static int s_update_ref(const char *action,
 203                         struct ref *ref,
 204                         int check_old)
 205 {
 206         char msg[1024];
 207         char *rla = getenv("GIT_REFLOG_ACTION");
 208         static struct ref_lock *lock;
 209
 210         if (dry_run)
 211                 return 0;
 212         if (!rla)
 213                 rla = default_rla.buf;
 214         snprintf(msg, sizeof(msg), "%s: %s", rla, action);
 215         lock = lock_any_ref_for_update(ref->name,
 216                                        check_old ? ref->old_sha1 : NULL, 0);
 217         if (!lock)
 218                 return errno == ENOTDIR ? STORE_REF_ERROR_DF_CONFLICT :
 219                                           STORE_REF_ERROR_OTHER;
 220         if (write_ref_sha1(lock, ref->new_sha1, msg) < 0)
 221                 return errno == ENOTDIR ? STORE_REF_ERROR_DF_CONFLICT :
 222                                           STORE_REF_ERROR_OTHER;
 223         return 0;
 224 }
 225
 226 #define REFCOL_WIDTH  10
 227
 228 static int update_local_ref(struct ref *ref,
 229                             const char *remote,
 230                             char *display)
 231 {
 232         struct commit *current = NULL, *updated;
 233         enum object_type type;
 234         struct branch *current_branch = branch_get(NULL);
 235         const char *pretty_ref = prettify_refname(ref->name);
 236
 237         *display = 0;
 238         type = sha1_object_info(ref->new_sha1, NULL);
 239         if (type < 0)
 240                 die("object %s not found", sha1_to_hex(ref->new_sha1));
 241
 242         if (!hashcmp(ref->old_sha1, ref->new_sha1)) {
 243                 if (verbosity > 0)
 244                         sprintf(display, "= %-*s %-*s -> %s", TRANSPORT_SUMMARY_WIDTH,
 245                                 "[up to date]", REFCOL_WIDTH, remote,
 246                                 pretty_ref);
 247                 return 0;
 248         }
 249
 250         if (current_branch &&
 251             !strcmp(ref->name, current_branch->name) &&
 252             !(update_head_ok || is_bare_repository()) &&
 253             !is_null_sha1(ref->old_sha1)) {
 254                 /*
 255                  * If this is the head, and it's not okay to update
 256                  * the head, and the old value of the head isn't empty...
 257                  */
 258                 sprintf(display, "! %-*s %-*s -> %s  (can't fetch in current branch)",
 259                         TRANSPORT_SUMMARY_WIDTH, "[rejected]", REFCOL_WIDTH, remote,
 260                         pretty_ref);
 261                 return 1;
 262         }
 263
 264         if (!is_null_sha1(ref->old_sha1) &&
 265             !prefixcmp(ref->name, "refs/tags/")) {
 266                 int r;
 267                 r = s_update_ref("updating tag", ref, 0);
 268                 sprintf(display, "%c %-*s %-*s -> %s%s", r ? '!' : '-',
 269                         TRANSPORT_SUMMARY_WIDTH, "[tag update]", REFCOL_WIDTH, remote,
 270                         pretty_ref, r ? "  (unable to update local ref)" : "");
 271                 return r;
 272         }
 273
 274         current = lookup_commit_reference_gently(ref->old_sha1, 1);
 275         updated = lookup_commit_reference_gently(ref->new_sha1, 1);
 276         if (!current || !updated) {
 277                 const char *msg;
 278                 const char *what;
 279                 int r;
 280                 if (!strncmp(ref->name, "refs/tags/", 10)) {
 281                         msg = "storing tag";
 282                         what = "[new tag]";
 283                 }
 284                 else {
 285                         msg = "storing head";
 286                         what = "[new branch]";
 287                 }
 288
 289                 r = s_update_ref(msg, ref, 0);
 290                 sprintf(display, "%c %-*s %-*s -> %s%s", r ? '!' : '*',
 291                         TRANSPORT_SUMMARY_WIDTH, what, REFCOL_WIDTH, remote, pretty_ref,
 292                         r ? "  (unable to update local ref)" : "");
 293                 return r;
 294         }
 295
 296         if (in_merge_bases(current, &updated, 1)) {
 297                 char quickref[83];
 298                 int r;
 299                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 300                 strcat(quickref, "..");
 301                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 302                 r = s_update_ref("fast-forward", ref, 1);
 303                 sprintf(display, "%c %-*s %-*s -> %s%s", r ? '!' : ' ',
 304                         TRANSPORT_SUMMARY_WIDTH, quickref, REFCOL_WIDTH, remote,
 305                         pretty_ref, r ? "  (unable to update local ref)" : "");
 306                 return r;
 307         } else if (force || ref->force) {
 308                 char quickref[84];
 309                 int r;
 310                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 311                 strcat(quickref, "...");
 312                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 313                 r = s_update_ref("forced-update", ref, 1);
 314                 sprintf(display, "%c %-*s %-*s -> %s  (%s)", r ? '!' : '+',
 315                         TRANSPORT_SUMMARY_WIDTH, quickref, REFCOL_WIDTH, remote,
 316                         pretty_ref,
 317                         r ? "unable to update local ref" : "forced update");
 318                 return r;
 319         } else {
 320                 sprintf(display, "! %-*s %-*s -> %s  (non-fast-forward)",
 321                         TRANSPORT_SUMMARY_WIDTH, "[rejected]", REFCOL_WIDTH, remote,
 322                         pretty_ref);
 323                 return 1;
 324         }
 325 }
 326
 327 static int store_updated_refs(const char *raw_url, const char *remote_name,
 328                 struct ref *ref_map)
 329 {
 330         FILE *fp;
 331         struct commit *commit;
 332         int url_len, i, note_len, shown_url = 0, rc = 0;
 333         char note[1024];
 334         const char *what, *kind;
 335         struct ref *rm;
 336         char *url, *filename = dry_run ? "/dev/null" : git_path("FETCH_HEAD");
 337
 338         fp = fopen(filename, "a");
 339         if (!fp)
 340                 return error("cannot open %s: %s\n", filename, strerror(errno));
 341
 342         if (raw_url)
 343                 url = transport_anonymize_url(raw_url);
 344         else
 345                 url = xstrdup("foreign");
 346         for (rm = ref_map; rm; rm = rm->next) {
 347                 struct ref *ref = NULL;
 348
 349                 if (rm->peer_ref) {
 350                         ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
 351                         strcpy(ref->name, rm->peer_ref->name);
 352                         hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
 353                         hashcpy(ref->new_sha1, rm->old_sha1);
 354                         ref->force = rm->peer_ref->force;
 355                 }
 356
 357                 commit = lookup_commit_reference_gently(rm->old_sha1, 1);
 358                 if (!commit)
 359                         rm->merge = 0;
 360
 361                 if (!strcmp(rm->name, "HEAD")) {
 362                         kind = "";
 363                         what = "";
 364                 }
 365                 else if (!prefixcmp(rm->name, "refs/heads/")) {
 366                         kind = "branch";
 367                         what = rm->name + 11;
 368                 }
 369                 else if (!prefixcmp(rm->name, "refs/tags/")) {
 370                         kind = "tag";
 371                         what = rm->name + 10;
 372                 }
 373                 else if (!prefixcmp(rm->name, "refs/remotes/")) {
 374                         kind = "remote-tracking branch";
 375                         what = rm->name + 13;
 376                 }
 377                 else {
 378                         kind = "";
 379                         what = rm->name;
 380                 }
 381
 382                 url_len = strlen(url);
 383                 for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 384                         ;
 385                 url_len = i + 1;
 386                 if (4 < i && !strncmp(".git", url + i - 3, 4))
 387                         url_len = i - 3;
 388
 389                 note_len = 0;
 390                 if (*what) {
 391                         if (*kind)
 392                                 note_len += sprintf(note + note_len, "%s ",
 393                                                     kind);
 394                         note_len += sprintf(note + note_len, "'%s' of ", what);
 395                 }
 396                 note[note_len] = '\0';
 397                 fprintf(fp, "%s\t%s\t%s",
 398                         sha1_to_hex(commit ? commit->object.sha1 :
 399                                     rm->old_sha1),
 400                         rm->merge ? "" : "not-for-merge",
 401                         note);
 402                 for (i = 0; i < url_len; ++i)
 403                         if ('\n' == url[i])
 404                                 fputs("\\n", fp);
 405                         else
 406                                 fputc(url[i], fp);
 407                 fputc('\n', fp);
 408
 409                 if (ref) {
 410                         rc |= update_local_ref(ref, what, note);
 411                         free(ref);
 412                 } else
 413                         sprintf(note, "* %-*s %-*s -> FETCH_HEAD",
 414                                 TRANSPORT_SUMMARY_WIDTH, *kind ? kind : "branch",
 415                                  REFCOL_WIDTH, *what ? what : "HEAD");
 416                 if (*note) {
 417                         if (verbosity >= 0 && !shown_url) {
 418                                 fprintf(stderr, "From %.*s\n",
 419                                                 url_len, url);
 420                                 shown_url = 1;
 421                         }
 422                         if (verbosity >= 0)
 423                                 fprintf(stderr, " %s\n", note);
 424                 }
 425         }
 426         free(url);
 427         fclose(fp);
 428         if (rc & STORE_REF_ERROR_DF_CONFLICT)
 429                 error("some local refs could not be updated; try running\n"
 430                       " 'git remote prune %s' to remove any old, conflicting "
 431                       "branches", remote_name);
 432         return rc;
 433 }
 434
 435 /*
 436  * We would want to bypass the object transfer altogether if
 437  * everything we are going to fetch already exists and is connected
 438  * locally.
 439  *
 440  * The refs we are going to fetch are in ref_map.  If running
 441  *
 442  *  $ git rev-list --objects --stdin --not --all
 443  *
 444  * (feeding all the refs in ref_map on its standard input)
 445  * does not error out, that means everything reachable from the
 446  * refs we are going to fetch exists and is connected to some of
 447  * our existing refs.
 448  */
 449 static int quickfetch(struct ref *ref_map)
 450 {
 451         struct child_process revlist;
 452         struct ref *ref;
 453         int err;
 454         const char *argv[] = {"rev-list",
 455                 "--quiet", "--objects", "--stdin", "--not", "--all", NULL};
 456
 457         /*
 458          * If we are deepening a shallow clone we already have these
 459          * objects reachable.  Running rev-list here will return with
 460          * a good (0) exit status and we'll bypass the fetch that we
 461          * really need to perform.  Claiming failure now will ensure
 462          * we perform the network exchange to deepen our history.
 463          */
 464         if (depth)
 465                 return -1;
 466
 467         if (!ref_map)
 468                 return 0;
 469
 470         memset(&revlist, 0, sizeof(revlist));
 471         revlist.argv = argv;
 472         revlist.git_cmd = 1;
 473         revlist.no_stdout = 1;
 474         revlist.no_stderr = 1;
 475         revlist.in = -1;
 476
 477         err = start_command(&revlist);
 478         if (err) {
 479                 error("could not run rev-list");
 480                 return err;
 481         }
 482
 483         /*
 484          * If rev-list --stdin encounters an unknown commit, it terminates,
 485          * which will cause SIGPIPE in the write loop below.
 486          */
 487         sigchain_push(SIGPIPE, SIG_IGN);
 488
 489         for (ref = ref_map; ref; ref = ref->next) {
 490                 if (write_in_full(revlist.in, sha1_to_hex(ref->old_sha1), 40) < 0 ||
 491                     write_str_in_full(revlist.in, "\n") < 0) {
 492                         if (errno != EPIPE && errno != EINVAL)
 493                                 error("failed write to rev-list: %s", strerror(errno));
 494                         err = -1;
 495                         break;
 496                 }
 497         }
 498
 499         if (close(revlist.in)) {
 500                 error("failed to close rev-list's stdin: %s", strerror(errno));
 501                 err = -1;
 502         }
 503
 504         sigchain_pop(SIGPIPE);
 505
 506         return finish_command(&revlist) || err;
 507 }
 508
 509 static int fetch_refs(struct transport *transport, struct ref *ref_map)
 510 {
 511         int ret = quickfetch(ref_map);
 512         if (ret)
 513                 ret = transport_fetch_refs(transport, ref_map);
 514         if (!ret)
 515                 ret |= store_updated_refs(transport->url,
 516                                 transport->remote->name,
 517                                 ref_map);
 518         transport_unlock_pack(transport);
 519         return ret;
 520 }
 521
 522 static int prune_refs(struct transport *transport, struct ref *ref_map)
 523 {
 524         int result = 0;
 525         struct ref *ref, *stale_refs = get_stale_heads(transport->remote, ref_map);
 526         const char *dangling_msg = dry_run
 527                 ? "   (%s will become dangling)\n"
 528                 : "   (%s has become dangling)\n";
 529
 530         for (ref = stale_refs; ref; ref = ref->next) {
 531                 if (!dry_run)
 532                         result |= delete_ref(ref->name, NULL, 0);
 533                 if (verbosity >= 0) {
 534                         fprintf(stderr, " x %-*s %-*s -> %s\n",
 535                                 TRANSPORT_SUMMARY_WIDTH, "[deleted]",
 536                                 REFCOL_WIDTH, "(none)", prettify_refname(ref->name));
 537                         warn_dangling_symref(stderr, dangling_msg, ref->name);
 538                 }
 539         }
 540         free_refs(stale_refs);
 541         return result;
 542 }
 543
 544 static int add_existing(const char *refname, const unsigned char *sha1,
 545                         int flag, void *cbdata)
 546 {
 547         struct string_list *list = (struct string_list *)cbdata;
 548         struct string_list_item *item = string_list_insert(list, refname);
 549         item->util = (void *)sha1;
 550         return 0;
 551 }
 552
 553 static int will_fetch(struct ref **head, const unsigned char *sha1)
 554 {
 555         struct ref *rm = *head;
 556         while (rm) {
 557                 if (!hashcmp(rm->old_sha1, sha1))
 558                         return 1;
 559                 rm = rm->next;
 560         }
 561         return 0;
 562 }
 563
 564 static void find_non_local_tags(struct transport *transport,
 565                         struct ref **head,
 566                         struct ref ***tail)
 567 {
 568         struct string_list existing_refs = STRING_LIST_INIT_NODUP;
 569         struct string_list remote_refs = STRING_LIST_INIT_NODUP;
 570         const struct ref *ref;
 571         struct string_list_item *item = NULL;
 572
 573         for_each_ref(add_existing, &existing_refs);
 574         for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
 575                 if (prefixcmp(ref->name, "refs/tags"))
 576                         continue;
 577
 578                 /*
 579                  * The peeled ref always follows the matching base
 580                  * ref, so if we see a peeled ref that we don't want
 581                  * to fetch then we can mark the ref entry in the list
 582                  * as one to ignore by setting util to NULL.
 583                  */
 584                 if (!suffixcmp(ref->name, "^{}")) {
 585                         if (item && !has_sha1_file(ref->old_sha1) &&
 586                             !will_fetch(head, ref->old_sha1) &&
 587                             !has_sha1_file(item->util) &&
 588                             !will_fetch(head, item->util))
 589                                 item->util = NULL;
 590                         item = NULL;
 591                         continue;
 592                 }
 593
 594                 /*
 595                  * If item is non-NULL here, then we previously saw a
 596                  * ref not followed by a peeled reference, so we need
 597                  * to check if it is a lightweight tag that we want to
 598                  * fetch.
 599                  */
 600                 if (item && !has_sha1_file(item->util) &&
 601                     !will_fetch(head, item->util))
 602                         item->util = NULL;
 603
 604                 item = NULL;
 605
 606                 /* skip duplicates and refs that we already have */
 607                 if (string_list_has_string(&remote_refs, ref->name) ||
 608                     string_list_has_string(&existing_refs, ref->name))
 609                         continue;
 610
 611                 item = string_list_insert(&remote_refs, ref->name);
 612                 item->util = (void *)ref->old_sha1;
 613         }
 614         string_list_clear(&existing_refs, 0);
 615
 616         /*
 617          * We may have a final lightweight tag that needs to be
 618          * checked to see if it needs fetching.
 619          */
 620         if (item && !has_sha1_file(item->util) &&
 621             !will_fetch(head, item->util))
 622                 item->util = NULL;
 623
 624         /*
 625          * For all the tags in the remote_refs string list,
 626          * add them to the list of refs to be fetched
 627          */
 628         for_each_string_list_item(item, &remote_refs) {
 629                 /* Unless we have already decided to ignore this item... */
 630                 if (item->util)
 631                 {
 632                         struct ref *rm = alloc_ref(item->string);
 633                         rm->peer_ref = alloc_ref(item->string);
 634                         hashcpy(rm->old_sha1, item->util);
 635                         **tail = rm;
 636                         *tail = &rm->next;
 637                 }
 638         }
 639
 640         string_list_clear(&remote_refs, 0);
 641 }
 642
 643 static void check_not_current_branch(struct ref *ref_map)
 644 {
 645         struct branch *current_branch = branch_get(NULL);
 646
 647         if (is_bare_repository() || !current_branch)
 648                 return;
 649
 650         for (; ref_map; ref_map = ref_map->next)
 651                 if (ref_map->peer_ref && !strcmp(current_branch->refname,
 652                                         ref_map->peer_ref->name))
 653                         die("Refusing to fetch into current branch %s "
 654                             "of non-bare repository", current_branch->refname);
 655 }
 656
 657 static int truncate_fetch_head(void)
 658 {
 659         char *filename = git_path("FETCH_HEAD");
 660         FILE *fp = fopen(filename, "w");
 661
 662         if (!fp)
 663                 return error("cannot open %s: %s\n", filename, strerror(errno));
 664         fclose(fp);
 665         return 0;
 666 }
 667
 668 static int do_fetch(struct transport *transport,
 669                     struct refspec *refs, int ref_count)
 670 {
 671         struct string_list existing_refs = STRING_LIST_INIT_NODUP;
 672         struct string_list_item *peer_item = NULL;
 673         struct ref *ref_map;
 674         struct ref *rm;
 675         int autotags = (transport->remote->fetch_tags == 1);
 676
 677         for_each_ref(add_existing, &existing_refs);
 678
 679         if (tags == TAGS_DEFAULT) {
 680                 if (transport->remote->fetch_tags == 2)
 681                         tags = TAGS_SET;
 682                 if (transport->remote->fetch_tags == -1)
 683                         tags = TAGS_UNSET;
 684         }
 685
 686         if (!transport->get_refs_list || !transport->fetch)
 687                 die("Don't know how to fetch from %s", transport->url);
 688
 689         /* if not appending, truncate FETCH_HEAD */
 690         if (!append && !dry_run) {
 691                 int errcode = truncate_fetch_head();
 692                 if (errcode)
 693                         return errcode;
 694         }
 695
 696         ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
 697         if (!update_head_ok)
 698                 check_not_current_branch(ref_map);
 699
 700         for (rm = ref_map; rm; rm = rm->next) {
 701                 if (rm->peer_ref) {
 702                         peer_item = string_list_lookup(&existing_refs,
 703                                                        rm->peer_ref->name);
 704                         if (peer_item)
 705                                 hashcpy(rm->peer_ref->old_sha1,
 706                                         peer_item->util);
 707                 }
 708         }
 709
 710         if (tags == TAGS_DEFAULT && autotags)
 711                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
 712         if (fetch_refs(transport, ref_map)) {
 713                 free_refs(ref_map);
 714                 return 1;
 715         }
 716         if (prune)
 717                 prune_refs(transport, ref_map);
 718         free_refs(ref_map);
 719
 720         /* if neither --no-tags nor --tags was specified, do automated tag
 721          * following ... */
 722         if (tags == TAGS_DEFAULT && autotags) {
 723                 struct ref **tail = &ref_map;
 724                 ref_map = NULL;
 725                 find_non_local_tags(transport, &ref_map, &tail);
 726                 if (ref_map) {
 727                         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
 728                         transport_set_option(transport, TRANS_OPT_DEPTH, "0");
 729                         fetch_refs(transport, ref_map);
 730                 }
 731                 free_refs(ref_map);
 732         }
 733
 734         return 0;
 735 }
 736
 737 static void set_option(const char *name, const char *value)
 738 {
 739         int r = transport_set_option(transport, name, value);
 740         if (r < 0)
 741                 die("Option \"%s\" value \"%s\" is not valid for %s",
 742                         name, value, transport->url);
 743         if (r > 0)
 744                 warning("Option \"%s\" is ignored for %s\n",
 745                         name, transport->url);
 746 }
 747
 748 static int get_one_remote_for_fetch(struct remote *remote, void *priv)
 749 {
 750         struct string_list *list = priv;
 751         if (!remote->skip_default_update)
 752                 string_list_append(list, remote->name);
 753         return 0;
 754 }
 755
 756 struct remote_group_data {
 757         const char *name;
 758         struct string_list *list;
 759 };
 760
 761 static int get_remote_group(const char *key, const char *value, void *priv)
 762 {
 763         struct remote_group_data *g = priv;
 764
 765         if (!prefixcmp(key, "remotes.") &&
 766                         !strcmp(key + 8, g->name)) {
 767                 /* split list by white space */
 768                 int space = strcspn(value, " \t\n");
 769                 while (*value) {
 770                         if (space > 1) {
 771                                 string_list_append(g->list,
 772                                                    xstrndup(value, space));
 773                         }
 774                         value += space + (value[space] != '\0');
 775                         space = strcspn(value, " \t\n");
 776                 }
 777         }
 778
 779         return 0;
 780 }
 781
 782 static int add_remote_or_group(const char *name, struct string_list *list)
 783 {
 784         int prev_nr = list->nr;
 785         struct remote_group_data g;
 786         g.name = name; g.list = list;
 787
 788         git_config(get_remote_group, &g);
 789         if (list->nr == prev_nr) {
 790                 struct remote *remote;
 791                 if (!remote_is_configured(name))
 792                         return 0;
 793                 remote = remote_get(name);
 794                 string_list_append(list, remote->name);
 795         }
 796         return 1;
 797 }
 798
 799 static void add_options_to_argv(int *argc, const char **argv)
 800 {
 801         if (dry_run)
 802                 argv[(*argc)++] = "--dry-run";
 803         if (prune)
 804                 argv[(*argc)++] = "--prune";
 805         if (update_head_ok)
 806                 argv[(*argc)++] = "--update-head-ok";
 807         if (force)
 808                 argv[(*argc)++] = "--force";
 809         if (keep)
 810                 argv[(*argc)++] = "--keep";
 811         if (recurse_submodules == RECURSE_SUBMODULES_ON)
 812                 argv[(*argc)++] = "--recurse-submodules";
 813         if (verbosity >= 2)
 814                 argv[(*argc)++] = "-v";
 815         if (verbosity >= 1)
 816                 argv[(*argc)++] = "-v";
 817         else if (verbosity < 0)
 818                 argv[(*argc)++] = "-q";
 819
 820 }
 821
 822 static int fetch_multiple(struct string_list *list)
 823 {
 824         int i, result = 0;
 825         const char *argv[12] = { "fetch", "--append" };
 826         int argc = 2;
 827
 828         add_options_to_argv(&argc, argv);
 829
 830         if (!append && !dry_run) {
 831                 int errcode = truncate_fetch_head();
 832                 if (errcode)
 833                         return errcode;
 834         }
 835
 836         for (i = 0; i < list->nr; i++) {
 837                 const char *name = list->items[i].string;
 838                 argv[argc] = name;
 839                 argv[argc + 1] = NULL;
 840                 if (verbosity >= 0)
 841                         printf("Fetching %s\n", name);
 842                 if (run_command_v_opt(argv, RUN_GIT_CMD)) {
 843                         error("Could not fetch %s", name);
 844                         result = 1;
 845                 }
 846         }
 847
 848         return result;
 849 }
 850
 851 static int fetch_one(struct remote *remote, int argc, const char **argv)
 852 {
 853         int i;
 854         static const char **refs = NULL;
 855         int ref_nr = 0;
 856         int exit_code;
 857
 858         if (!remote)
 859                 die("No remote repository specified.  Please, specify either a URL or a\n"
 860                     "remote name from which new revisions should be fetched.");
 861
 862         transport = transport_get(remote, NULL);
 863         transport_set_verbosity(transport, verbosity, progress);
 864         if (upload_pack)
 865                 set_option(TRANS_OPT_UPLOADPACK, upload_pack);
 866         if (keep)
 867                 set_option(TRANS_OPT_KEEP, "yes");
 868         if (depth)
 869                 set_option(TRANS_OPT_DEPTH, depth);
 870
 871         if (argc > 0) {
 872                 int j = 0;
 873                 refs = xcalloc(argc + 1, sizeof(const char *));
 874                 for (i = 0; i < argc; i++) {
 875                         if (!strcmp(argv[i], "tag")) {
 876                                 char *ref;
 877                                 i++;
 878                                 if (i >= argc)
 879                                         die("You need to specify a tag name.");
 880                                 ref = xmalloc(strlen(argv[i]) * 2 + 22);
 881                                 strcpy(ref, "refs/tags/");
 882                                 strcat(ref, argv[i]);
 883                                 strcat(ref, ":refs/tags/");
 884                                 strcat(ref, argv[i]);
 885                                 refs[j++] = ref;
 886                         } else
 887                                 refs[j++] = argv[i];
 888                 }
 889                 refs[j] = NULL;
 890                 ref_nr = j;
 891         }
 892
 893         sigchain_push_common(unlock_pack_on_signal);
 894         atexit(unlock_pack);
 895         exit_code = do_fetch(transport,
 896                         parse_fetch_refspec(ref_nr, refs), ref_nr);
 897         transport_disconnect(transport);
 898         transport = NULL;
 899         return exit_code;
 900 }
 901
 902 int cmd_fetch(int argc, const char **argv, const char *prefix)
 903 {
 904         int i;
 905         struct string_list list = STRING_LIST_INIT_NODUP;
 906         struct remote *remote;
 907         int result = 0;
 908
 909         /* Record the command line for the reflog */
 910         strbuf_addstr(&default_rla, "fetch");
 911         for (i = 1; i < argc; i++)
 912                 strbuf_addf(&default_rla, " %s", argv[i]);
 913
 914         argc = parse_options(argc, argv, prefix,
 915                              builtin_fetch_options, builtin_fetch_usage, 0);
 916
 917         if (all) {
 918                 if (argc == 1)
 919                         die("fetch --all does not take a repository argument");
 920                 else if (argc > 1)
 921                         die("fetch --all does not make sense with refspecs");
 922                 (void) for_each_remote(get_one_remote_for_fetch, &list);
 923                 result = fetch_multiple(&list);
 924         } else if (argc == 0) {
 925                 /* No arguments -- use default remote */
 926                 remote = remote_get(NULL);
 927                 result = fetch_one(remote, argc, argv);
 928         } else if (multiple) {
 929                 /* All arguments are assumed to be remotes or groups */
 930                 for (i = 0; i < argc; i++)
 931                         if (!add_remote_or_group(argv[i], &list))
 932                                 die("No such remote or remote group: %s", argv[i]);
 933                 result = fetch_multiple(&list);
 934         } else {
 935                 /* Single remote or group */
 936                 (void) add_remote_or_group(argv[0], &list);
 937                 if (list.nr > 1) {
 938                         /* More than one remote */
 939                         if (argc > 1)
 940                                 die("Fetching a group and specifying refspecs does not make sense");
 941                         result = fetch_multiple(&list);
 942                 } else {
 943                         /* Zero or one remotes */
 944                         remote = remote_get(argv[0]);
 945                         result = fetch_one(remote, argc-1, argv+1);
 946                 }
 947         }
 948
 949         if (!result && (recurse_submodules != RECURSE_SUBMODULES_OFF)) {
 950                 const char *options[10];
 951                 int num_options = 0;
 952                 /* Set recursion as default when we already are recursing */
 953                 if (submodule_prefix[0])
 954                         set_config_fetch_recurse_submodules(1);
 955                 gitmodules_config();
 956                 git_config(submodule_config, NULL);
 957                 add_options_to_argv(&num_options, options);
 958                 result = fetch_populated_submodules(num_options, options,
 959                                                     submodule_prefix,
 960                                                     recurse_submodules == RECURSE_SUBMODULES_ON,
 961                                                     verbosity < 0);
 962         }
 963
 964         /* All names were strdup()ed or strndup()ed */
 965         list.strdup_strings = 1;
 966         string_list_clear(&list, 0);
 967
 968         return result;
 969 }