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 "submodule-config.h"
  15 #include "submodule.h"
  16 #include "connected.h"
  17 #include "argv-array.h"
  18
  19 static const char * const builtin_fetch_usage[] = {
  20         N_("git fetch [<options>] [<repository> [<refspec>...]]"),
  21         N_("git fetch [<options>] <group>"),
  22         N_("git fetch --multiple [<options>] [(<repository> | <group>)...]"),
  23         N_("git fetch --all [<options>]"),
  24         NULL
  25 };
  26
  27 enum {
  28         TAGS_UNSET = 0,
  29         TAGS_DEFAULT = 1,
  30         TAGS_SET = 2
  31 };
  32
  33 static int fetch_prune_config = -1; /* unspecified */
  34 static int prune = -1; /* unspecified */
  35 #define PRUNE_BY_DEFAULT 0 /* do we prune by default? */
  36
  37 static int all, append, dry_run, force, keep, multiple, update_head_ok, verbosity;
  38 static int progress = -1, recurse_submodules = RECURSE_SUBMODULES_DEFAULT;
  39 static int tags = TAGS_DEFAULT, unshallow, update_shallow;
  40 static int max_children = 1;
  41 static const char *depth;
  42 static const char *upload_pack;
  43 static struct strbuf default_rla = STRBUF_INIT;
  44 static struct transport *gtransport;
  45 static struct transport *gsecondary;
  46 static const char *submodule_prefix = "";
  47 static const char *recurse_submodules_default;
  48 static int shown_url = 0;
  49 static int refmap_alloc, refmap_nr;
  50 static const char **refmap_array;
  51
  52 static int option_parse_recurse_submodules(const struct option *opt,
  53                                    const char *arg, int unset)
  54 {
  55         if (unset) {
  56                 recurse_submodules = RECURSE_SUBMODULES_OFF;
  57         } else {
  58                 if (arg)
  59                         recurse_submodules = parse_fetch_recurse_submodules_arg(opt->long_name, arg);
  60                 else
  61                         recurse_submodules = RECURSE_SUBMODULES_ON;
  62         }
  63         return 0;
  64 }
  65
  66 static int git_fetch_config(const char *k, const char *v, void *cb)
  67 {
  68         if (!strcmp(k, "fetch.prune")) {
  69                 fetch_prune_config = git_config_bool(k, v);
  70                 return 0;
  71         }
  72         return git_default_config(k, v, cb);
  73 }
  74
  75 static int parse_refmap_arg(const struct option *opt, const char *arg, int unset)
  76 {
  77         ALLOC_GROW(refmap_array, refmap_nr + 1, refmap_alloc);
  78
  79         /*
  80          * "git fetch --refmap='' origin foo"
  81          * can be used to tell the command not to store anywhere
  82          */
  83         if (*arg)
  84                 refmap_array[refmap_nr++] = arg;
  85         return 0;
  86 }
  87
  88 static struct option builtin_fetch_options[] = {
  89         OPT__VERBOSITY(&verbosity),
  90         OPT_BOOL(0, "all", &all,
  91                  N_("fetch from all remotes")),
  92         OPT_BOOL('a', "append", &append,
  93                  N_("append to .git/FETCH_HEAD instead of overwriting")),
  94         OPT_STRING(0, "upload-pack", &upload_pack, N_("path"),
  95                    N_("path to upload pack on remote end")),
  96         OPT__FORCE(&force, N_("force overwrite of local branch")),
  97         OPT_BOOL('m', "multiple", &multiple,
  98                  N_("fetch from multiple remotes")),
  99         OPT_SET_INT('t', "tags", &tags,
 100                     N_("fetch all tags and associated objects"), TAGS_SET),
 101         OPT_SET_INT('n', NULL, &tags,
 102                     N_("do not fetch all tags (--no-tags)"), TAGS_UNSET),
 103         OPT_INTEGER('j', "jobs", &max_children,
 104                     N_("number of submodules fetched in parallel")),
 105         OPT_BOOL('p', "prune", &prune,
 106                  N_("prune remote-tracking branches no longer on remote")),
 107         { OPTION_CALLBACK, 0, "recurse-submodules", NULL, N_("on-demand"),
 108                     N_("control recursive fetching of submodules"),
 109                     PARSE_OPT_OPTARG, option_parse_recurse_submodules },
 110         OPT_BOOL(0, "dry-run", &dry_run,
 111                  N_("dry run")),
 112         OPT_BOOL('k', "keep", &keep, N_("keep downloaded pack")),
 113         OPT_BOOL('u', "update-head-ok", &update_head_ok,
 114                     N_("allow updating of HEAD ref")),
 115         OPT_BOOL(0, "progress", &progress, N_("force progress reporting")),
 116         OPT_STRING(0, "depth", &depth, N_("depth"),
 117                    N_("deepen history of shallow clone")),
 118         { OPTION_SET_INT, 0, "unshallow", &unshallow, NULL,
 119                    N_("convert to a complete repository"),
 120                    PARSE_OPT_NONEG | PARSE_OPT_NOARG, NULL, 1 },
 121         { OPTION_STRING, 0, "submodule-prefix", &submodule_prefix, N_("dir"),
 122                    N_("prepend this to submodule path output"), PARSE_OPT_HIDDEN },
 123         { OPTION_STRING, 0, "recurse-submodules-default",
 124                    &recurse_submodules_default, NULL,
 125                    N_("default mode for recursion"), PARSE_OPT_HIDDEN },
 126         OPT_BOOL(0, "update-shallow", &update_shallow,
 127                  N_("accept refs that update .git/shallow")),
 128         { OPTION_CALLBACK, 0, "refmap", NULL, N_("refmap"),
 129           N_("specify fetch refmap"), PARSE_OPT_NONEG, parse_refmap_arg },
 130         OPT_END()
 131 };
 132
 133 static void unlock_pack(void)
 134 {
 135         if (gtransport)
 136                 transport_unlock_pack(gtransport);
 137         if (gsecondary)
 138                 transport_unlock_pack(gsecondary);
 139 }
 140
 141 static void unlock_pack_on_signal(int signo)
 142 {
 143         unlock_pack();
 144         sigchain_pop(signo);
 145         raise(signo);
 146 }
 147
 148 static void add_merge_config(struct ref **head,
 149                            const struct ref *remote_refs,
 150                            struct branch *branch,
 151                            struct ref ***tail)
 152 {
 153         int i;
 154
 155         for (i = 0; i < branch->merge_nr; i++) {
 156                 struct ref *rm, **old_tail = *tail;
 157                 struct refspec refspec;
 158
 159                 for (rm = *head; rm; rm = rm->next) {
 160                         if (branch_merge_matches(branch, i, rm->name)) {
 161                                 rm->fetch_head_status = FETCH_HEAD_MERGE;
 162                                 break;
 163                         }
 164                 }
 165                 if (rm)
 166                         continue;
 167
 168                 /*
 169                  * Not fetched to a remote-tracking branch?  We need to fetch
 170                  * it anyway to allow this branch's "branch.$name.merge"
 171                  * to be honored by 'git pull', but we do not have to
 172                  * fail if branch.$name.merge is misconfigured to point
 173                  * at a nonexisting branch.  If we were indeed called by
 174                  * 'git pull', it will notice the misconfiguration because
 175                  * there is no entry in the resulting FETCH_HEAD marked
 176                  * for merging.
 177                  */
 178                 memset(&refspec, 0, sizeof(refspec));
 179                 refspec.src = branch->merge[i]->src;
 180                 get_fetch_map(remote_refs, &refspec, tail, 1);
 181                 for (rm = *old_tail; rm; rm = rm->next)
 182                         rm->fetch_head_status = FETCH_HEAD_MERGE;
 183         }
 184 }
 185
 186 static int add_existing(const char *refname, const struct object_id *oid,
 187                         int flag, void *cbdata)
 188 {
 189         struct string_list *list = (struct string_list *)cbdata;
 190         struct string_list_item *item = string_list_insert(list, refname);
 191         struct object_id *old_oid = xmalloc(sizeof(*old_oid));
 192
 193         oidcpy(old_oid, oid);
 194         item->util = old_oid;
 195         return 0;
 196 }
 197
 198 static int will_fetch(struct ref **head, const unsigned char *sha1)
 199 {
 200         struct ref *rm = *head;
 201         while (rm) {
 202                 if (!hashcmp(rm->old_oid.hash, sha1))
 203                         return 1;
 204                 rm = rm->next;
 205         }
 206         return 0;
 207 }
 208
 209 static void find_non_local_tags(struct transport *transport,
 210                         struct ref **head,
 211                         struct ref ***tail)
 212 {
 213         struct string_list existing_refs = STRING_LIST_INIT_DUP;
 214         struct string_list remote_refs = STRING_LIST_INIT_NODUP;
 215         const struct ref *ref;
 216         struct string_list_item *item = NULL;
 217
 218         for_each_ref(add_existing, &existing_refs);
 219         for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
 220                 if (!starts_with(ref->name, "refs/tags/"))
 221                         continue;
 222
 223                 /*
 224                  * The peeled ref always follows the matching base
 225                  * ref, so if we see a peeled ref that we don't want
 226                  * to fetch then we can mark the ref entry in the list
 227                  * as one to ignore by setting util to NULL.
 228                  */
 229                 if (ends_with(ref->name, "^{}")) {
 230                         if (item && !has_object_file(&ref->old_oid) &&
 231                             !will_fetch(head, ref->old_oid.hash) &&
 232                             !has_sha1_file(item->util) &&
 233                             !will_fetch(head, item->util))
 234                                 item->util = NULL;
 235                         item = NULL;
 236                         continue;
 237                 }
 238
 239                 /*
 240                  * If item is non-NULL here, then we previously saw a
 241                  * ref not followed by a peeled reference, so we need
 242                  * to check if it is a lightweight tag that we want to
 243                  * fetch.
 244                  */
 245                 if (item && !has_sha1_file(item->util) &&
 246                     !will_fetch(head, item->util))
 247                         item->util = NULL;
 248
 249                 item = NULL;
 250
 251                 /* skip duplicates and refs that we already have */
 252                 if (string_list_has_string(&remote_refs, ref->name) ||
 253                     string_list_has_string(&existing_refs, ref->name))
 254                         continue;
 255
 256                 item = string_list_insert(&remote_refs, ref->name);
 257                 item->util = (void *)&ref->old_oid;
 258         }
 259         string_list_clear(&existing_refs, 1);
 260
 261         /*
 262          * We may have a final lightweight tag that needs to be
 263          * checked to see if it needs fetching.
 264          */
 265         if (item && !has_sha1_file(item->util) &&
 266             !will_fetch(head, item->util))
 267                 item->util = NULL;
 268
 269         /*
 270          * For all the tags in the remote_refs string list,
 271          * add them to the list of refs to be fetched
 272          */
 273         for_each_string_list_item(item, &remote_refs) {
 274                 /* Unless we have already decided to ignore this item... */
 275                 if (item->util)
 276                 {
 277                         struct ref *rm = alloc_ref(item->string);
 278                         rm->peer_ref = alloc_ref(item->string);
 279                         oidcpy(&rm->old_oid, item->util);
 280                         **tail = rm;
 281                         *tail = &rm->next;
 282                 }
 283         }
 284
 285         string_list_clear(&remote_refs, 0);
 286 }
 287
 288 static struct ref *get_ref_map(struct transport *transport,
 289                                struct refspec *refspecs, int refspec_count,
 290                                int tags, int *autotags)
 291 {
 292         int i;
 293         struct ref *rm;
 294         struct ref *ref_map = NULL;
 295         struct ref **tail = &ref_map;
 296
 297         /* opportunistically-updated references: */
 298         struct ref *orefs = NULL, **oref_tail = &orefs;
 299
 300         const struct ref *remote_refs = transport_get_remote_refs(transport);
 301
 302         if (refspec_count) {
 303                 struct refspec *fetch_refspec;
 304                 int fetch_refspec_nr;
 305
 306                 for (i = 0; i < refspec_count; i++) {
 307                         get_fetch_map(remote_refs, &refspecs[i], &tail, 0);
 308                         if (refspecs[i].dst && refspecs[i].dst[0])
 309                                 *autotags = 1;
 310                 }
 311                 /* Merge everything on the command line (but not --tags) */
 312                 for (rm = ref_map; rm; rm = rm->next)
 313                         rm->fetch_head_status = FETCH_HEAD_MERGE;
 314
 315                 /*
 316                  * For any refs that we happen to be fetching via
 317                  * command-line arguments, the destination ref might
 318                  * have been missing or have been different than the
 319                  * remote-tracking ref that would be derived from the
 320                  * configured refspec.  In these cases, we want to
 321                  * take the opportunity to update their configured
 322                  * remote-tracking reference.  However, we do not want
 323                  * to mention these entries in FETCH_HEAD at all, as
 324                  * they would simply be duplicates of existing
 325                  * entries, so we set them FETCH_HEAD_IGNORE below.
 326                  *
 327                  * We compute these entries now, based only on the
 328                  * refspecs specified on the command line.  But we add
 329                  * them to the list following the refspecs resulting
 330                  * from the tags option so that one of the latter,
 331                  * which has FETCH_HEAD_NOT_FOR_MERGE, is not removed
 332                  * by ref_remove_duplicates() in favor of one of these
 333                  * opportunistic entries with FETCH_HEAD_IGNORE.
 334                  */
 335                 if (refmap_array) {
 336                         fetch_refspec = parse_fetch_refspec(refmap_nr, refmap_array);
 337                         fetch_refspec_nr = refmap_nr;
 338                 } else {
 339                         fetch_refspec = transport->remote->fetch;
 340                         fetch_refspec_nr = transport->remote->fetch_refspec_nr;
 341                 }
 342
 343                 for (i = 0; i < fetch_refspec_nr; i++)
 344                         get_fetch_map(ref_map, &fetch_refspec[i], &oref_tail, 1);
 345
 346                 if (tags == TAGS_SET)
 347                         get_fetch_map(remote_refs, tag_refspec, &tail, 0);
 348         } else if (refmap_array) {
 349                 die("--refmap option is only meaningful with command-line refspec(s).");
 350         } else {
 351                 /* Use the defaults */
 352                 struct remote *remote = transport->remote;
 353                 struct branch *branch = branch_get(NULL);
 354                 int has_merge = branch_has_merge_config(branch);
 355                 if (remote &&
 356                     (remote->fetch_refspec_nr ||
 357                      /* Note: has_merge implies non-NULL branch->remote_name */
 358                      (has_merge && !strcmp(branch->remote_name, remote->name)))) {
 359                         for (i = 0; i < remote->fetch_refspec_nr; i++) {
 360                                 get_fetch_map(remote_refs, &remote->fetch[i], &tail, 0);
 361                                 if (remote->fetch[i].dst &&
 362                                     remote->fetch[i].dst[0])
 363                                         *autotags = 1;
 364                                 if (!i && !has_merge && ref_map &&
 365                                     !remote->fetch[0].pattern)
 366                                         ref_map->fetch_head_status = FETCH_HEAD_MERGE;
 367                         }
 368                         /*
 369                          * if the remote we're fetching from is the same
 370                          * as given in branch.<name>.remote, we add the
 371                          * ref given in branch.<name>.merge, too.
 372                          *
 373                          * Note: has_merge implies non-NULL branch->remote_name
 374                          */
 375                         if (has_merge &&
 376                             !strcmp(branch->remote_name, remote->name))
 377                                 add_merge_config(&ref_map, remote_refs, branch, &tail);
 378                 } else {
 379                         ref_map = get_remote_ref(remote_refs, "HEAD");
 380                         if (!ref_map)
 381                                 die(_("Couldn't find remote ref HEAD"));
 382                         ref_map->fetch_head_status = FETCH_HEAD_MERGE;
 383                         tail = &ref_map->next;
 384                 }
 385         }
 386
 387         if (tags == TAGS_SET)
 388                 /* also fetch all tags */
 389                 get_fetch_map(remote_refs, tag_refspec, &tail, 0);
 390         else if (tags == TAGS_DEFAULT && *autotags)
 391                 find_non_local_tags(transport, &ref_map, &tail);
 392
 393         /* Now append any refs to be updated opportunistically: */
 394         *tail = orefs;
 395         for (rm = orefs; rm; rm = rm->next) {
 396                 rm->fetch_head_status = FETCH_HEAD_IGNORE;
 397                 tail = &rm->next;
 398         }
 399
 400         return ref_remove_duplicates(ref_map);
 401 }
 402
 403 #define STORE_REF_ERROR_OTHER 1
 404 #define STORE_REF_ERROR_DF_CONFLICT 2
 405
 406 static int s_update_ref(const char *action,
 407                         struct ref *ref,
 408                         int check_old)
 409 {
 410         char msg[1024];
 411         char *rla = getenv("GIT_REFLOG_ACTION");
 412         struct ref_transaction *transaction;
 413         struct strbuf err = STRBUF_INIT;
 414         int ret, df_conflict = 0;
 415
 416         if (dry_run)
 417                 return 0;
 418         if (!rla)
 419                 rla = default_rla.buf;
 420         snprintf(msg, sizeof(msg), "%s: %s", rla, action);
 421
 422         transaction = ref_transaction_begin(&err);
 423         if (!transaction ||
 424             ref_transaction_update(transaction, ref->name,
 425                                    ref->new_oid.hash,
 426                                    check_old ? ref->old_oid.hash : NULL,
 427                                    0, msg, &err))
 428                 goto fail;
 429
 430         ret = ref_transaction_commit(transaction, &err);
 431         if (ret) {
 432                 df_conflict = (ret == TRANSACTION_NAME_CONFLICT);
 433                 goto fail;
 434         }
 435
 436         ref_transaction_free(transaction);
 437         strbuf_release(&err);
 438         return 0;
 439 fail:
 440         ref_transaction_free(transaction);
 441         error("%s", err.buf);
 442         strbuf_release(&err);
 443         return df_conflict ? STORE_REF_ERROR_DF_CONFLICT
 444                            : STORE_REF_ERROR_OTHER;
 445 }
 446
 447 #define REFCOL_WIDTH  10
 448
 449 static int update_local_ref(struct ref *ref,
 450                             const char *remote,
 451                             const struct ref *remote_ref,
 452                             struct strbuf *display)
 453 {
 454         struct commit *current = NULL, *updated;
 455         enum object_type type;
 456         struct branch *current_branch = branch_get(NULL);
 457         const char *pretty_ref = prettify_refname(ref->name);
 458
 459         type = sha1_object_info(ref->new_oid.hash, NULL);
 460         if (type < 0)
 461                 die(_("object %s not found"), oid_to_hex(&ref->new_oid));
 462
 463         if (!oidcmp(&ref->old_oid, &ref->new_oid)) {
 464                 if (verbosity > 0)
 465                         strbuf_addf(display, "= %-*s %-*s -> %s",
 466                                     TRANSPORT_SUMMARY(_("[up to date]")),
 467                                     REFCOL_WIDTH, remote, pretty_ref);
 468                 return 0;
 469         }
 470
 471         if (current_branch &&
 472             !strcmp(ref->name, current_branch->name) &&
 473             !(update_head_ok || is_bare_repository()) &&
 474             !is_null_oid(&ref->old_oid)) {
 475                 /*
 476                  * If this is the head, and it's not okay to update
 477                  * the head, and the old value of the head isn't empty...
 478                  */
 479                 strbuf_addf(display,
 480                             _("! %-*s %-*s -> %s  (can't fetch in current branch)"),
 481                             TRANSPORT_SUMMARY(_("[rejected]")),
 482                             REFCOL_WIDTH, remote, pretty_ref);
 483                 return 1;
 484         }
 485
 486         if (!is_null_oid(&ref->old_oid) &&
 487             starts_with(ref->name, "refs/tags/")) {
 488                 int r;
 489                 r = s_update_ref("updating tag", ref, 0);
 490                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 491                             r ? '!' : '-',
 492                             TRANSPORT_SUMMARY(_("[tag update]")),
 493                             REFCOL_WIDTH, remote, pretty_ref,
 494                             r ? _("  (unable to update local ref)") : "");
 495                 return r;
 496         }
 497
 498         current = lookup_commit_reference_gently(ref->old_oid.hash, 1);
 499         updated = lookup_commit_reference_gently(ref->new_oid.hash, 1);
 500         if (!current || !updated) {
 501                 const char *msg;
 502                 const char *what;
 503                 int r;
 504                 /*
 505                  * Nicely describe the new ref we're fetching.
 506                  * Base this on the remote's ref name, as it's
 507                  * more likely to follow a standard layout.
 508                  */
 509                 const char *name = remote_ref ? remote_ref->name : "";
 510                 if (starts_with(name, "refs/tags/")) {
 511                         msg = "storing tag";
 512                         what = _("[new tag]");
 513                 } else if (starts_with(name, "refs/heads/")) {
 514                         msg = "storing head";
 515                         what = _("[new branch]");
 516                 } else {
 517                         msg = "storing ref";
 518                         what = _("[new ref]");
 519                 }
 520
 521                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 522                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 523                         check_for_new_submodule_commits(ref->new_oid.hash);
 524                 r = s_update_ref(msg, ref, 0);
 525                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 526                             r ? '!' : '*',
 527                             TRANSPORT_SUMMARY(what),
 528                             REFCOL_WIDTH, remote, pretty_ref,
 529                             r ? _("  (unable to update local ref)") : "");
 530                 return r;
 531         }
 532
 533         if (in_merge_bases(current, updated)) {
 534                 struct strbuf quickref = STRBUF_INIT;
 535                 int r;
 536                 strbuf_add_unique_abbrev(&quickref, current->object.oid.hash, DEFAULT_ABBREV);
 537                 strbuf_addstr(&quickref, "..");
 538                 strbuf_add_unique_abbrev(&quickref, ref->new_oid.hash, DEFAULT_ABBREV);
 539                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 540                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 541                         check_for_new_submodule_commits(ref->new_oid.hash);
 542                 r = s_update_ref("fast-forward", ref, 1);
 543                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 544                             r ? '!' : ' ',
 545                             TRANSPORT_SUMMARY_WIDTH, quickref.buf,
 546                             REFCOL_WIDTH, remote, pretty_ref,
 547                             r ? _("  (unable to update local ref)") : "");
 548                 strbuf_release(&quickref);
 549                 return r;
 550         } else if (force || ref->force) {
 551                 struct strbuf quickref = STRBUF_INIT;
 552                 int r;
 553                 strbuf_add_unique_abbrev(&quickref, current->object.oid.hash, DEFAULT_ABBREV);
 554                 strbuf_addstr(&quickref, "...");
 555                 strbuf_add_unique_abbrev(&quickref, ref->new_oid.hash, DEFAULT_ABBREV);
 556                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 557                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 558                         check_for_new_submodule_commits(ref->new_oid.hash);
 559                 r = s_update_ref("forced-update", ref, 1);
 560                 strbuf_addf(display, "%c %-*s %-*s -> %s  (%s)",
 561                             r ? '!' : '+',
 562                             TRANSPORT_SUMMARY_WIDTH, quickref.buf,
 563                             REFCOL_WIDTH, remote, pretty_ref,
 564                             r ? _("unable to update local ref") : _("forced update"));
 565                 strbuf_release(&quickref);
 566                 return r;
 567         } else {
 568                 strbuf_addf(display, "! %-*s %-*s -> %s  %s",
 569                             TRANSPORT_SUMMARY(_("[rejected]")),
 570                             REFCOL_WIDTH, remote, pretty_ref,
 571                             _("(non-fast-forward)"));
 572                 return 1;
 573         }
 574 }
 575
 576 static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
 577 {
 578         struct ref **rm = cb_data;
 579         struct ref *ref = *rm;
 580
 581         while (ref && ref->status == REF_STATUS_REJECT_SHALLOW)
 582                 ref = ref->next;
 583         if (!ref)
 584                 return -1; /* end of the list */
 585         *rm = ref->next;
 586         hashcpy(sha1, ref->old_oid.hash);
 587         return 0;
 588 }
 589
 590 static int store_updated_refs(const char *raw_url, const char *remote_name,
 591                 struct ref *ref_map)
 592 {
 593         FILE *fp;
 594         struct commit *commit;
 595         int url_len, i, rc = 0;
 596         struct strbuf note = STRBUF_INIT;
 597         const char *what, *kind;
 598         struct ref *rm;
 599         char *url;
 600         const char *filename = dry_run ? "/dev/null" : git_path_fetch_head();
 601         int want_status;
 602
 603         fp = fopen(filename, "a");
 604         if (!fp)
 605                 return error(_("cannot open %s: %s\n"), filename, strerror(errno));
 606
 607         if (raw_url)
 608                 url = transport_anonymize_url(raw_url);
 609         else
 610                 url = xstrdup("foreign");
 611
 612         rm = ref_map;
 613         if (check_everything_connected(iterate_ref_map, 0, &rm)) {
 614                 rc = error(_("%s did not send all necessary objects\n"), url);
 615                 goto abort;
 616         }
 617
 618         /*
 619          * We do a pass for each fetch_head_status type in their enum order, so
 620          * merged entries are written before not-for-merge. That lets readers
 621          * use FETCH_HEAD as a refname to refer to the ref to be merged.
 622          */
 623         for (want_status = FETCH_HEAD_MERGE;
 624              want_status <= FETCH_HEAD_IGNORE;
 625              want_status++) {
 626                 for (rm = ref_map; rm; rm = rm->next) {
 627                         struct ref *ref = NULL;
 628                         const char *merge_status_marker = "";
 629
 630                         if (rm->status == REF_STATUS_REJECT_SHALLOW) {
 631                                 if (want_status == FETCH_HEAD_MERGE)
 632                                         warning(_("reject %s because shallow roots are not allowed to be updated"),
 633                                                 rm->peer_ref ? rm->peer_ref->name : rm->name);
 634                                 continue;
 635                         }
 636
 637                         commit = lookup_commit_reference_gently(rm->old_oid.hash, 1);
 638                         if (!commit)
 639                                 rm->fetch_head_status = FETCH_HEAD_NOT_FOR_MERGE;
 640
 641                         if (rm->fetch_head_status != want_status)
 642                                 continue;
 643
 644                         if (rm->peer_ref) {
 645                                 ref = alloc_ref(rm->peer_ref->name);
 646                                 oidcpy(&ref->old_oid, &rm->peer_ref->old_oid);
 647                                 oidcpy(&ref->new_oid, &rm->old_oid);
 648                                 ref->force = rm->peer_ref->force;
 649                         }
 650
 651
 652                         if (!strcmp(rm->name, "HEAD")) {
 653                                 kind = "";
 654                                 what = "";
 655                         }
 656                         else if (starts_with(rm->name, "refs/heads/")) {
 657                                 kind = "branch";
 658                                 what = rm->name + 11;
 659                         }
 660                         else if (starts_with(rm->name, "refs/tags/")) {
 661                                 kind = "tag";
 662                                 what = rm->name + 10;
 663                         }
 664                         else if (starts_with(rm->name, "refs/remotes/")) {
 665                                 kind = "remote-tracking branch";
 666                                 what = rm->name + 13;
 667                         }
 668                         else {
 669                                 kind = "";
 670                                 what = rm->name;
 671                         }
 672
 673                         url_len = strlen(url);
 674                         for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 675                                 ;
 676                         url_len = i + 1;
 677                         if (4 < i && !strncmp(".git", url + i - 3, 4))
 678                                 url_len = i - 3;
 679
 680                         strbuf_reset(&note);
 681                         if (*what) {
 682                                 if (*kind)
 683                                         strbuf_addf(&note, "%s ", kind);
 684                                 strbuf_addf(&note, "'%s' of ", what);
 685                         }
 686                         switch (rm->fetch_head_status) {
 687                         case FETCH_HEAD_NOT_FOR_MERGE:
 688                                 merge_status_marker = "not-for-merge";
 689                                 /* fall-through */
 690                         case FETCH_HEAD_MERGE:
 691                                 fprintf(fp, "%s\t%s\t%s",
 692                                         oid_to_hex(&rm->old_oid),
 693                                         merge_status_marker,
 694                                         note.buf);
 695                                 for (i = 0; i < url_len; ++i)
 696                                         if ('\n' == url[i])
 697                                                 fputs("\\n", fp);
 698                                         else
 699                                                 fputc(url[i], fp);
 700                                 fputc('\n', fp);
 701                                 break;
 702                         default:
 703                                 /* do not write anything to FETCH_HEAD */
 704                                 break;
 705                         }
 706
 707                         strbuf_reset(&note);
 708                         if (ref) {
 709                                 rc |= update_local_ref(ref, what, rm, &note);
 710                                 free(ref);
 711                         } else
 712                                 strbuf_addf(&note, "* %-*s %-*s -> FETCH_HEAD",
 713                                             TRANSPORT_SUMMARY_WIDTH,
 714                                             *kind ? kind : "branch",
 715                                             REFCOL_WIDTH,
 716                                             *what ? what : "HEAD");
 717                         if (note.len) {
 718                                 if (verbosity >= 0 && !shown_url) {
 719                                         fprintf(stderr, _("From %.*s\n"),
 720                                                         url_len, url);
 721                                         shown_url = 1;
 722                                 }
 723                                 if (verbosity >= 0)
 724                                         fprintf(stderr, " %s\n", note.buf);
 725                         }
 726                 }
 727         }
 728
 729         if (rc & STORE_REF_ERROR_DF_CONFLICT)
 730                 error(_("some local refs could not be updated; try running\n"
 731                       " 'git remote prune %s' to remove any old, conflicting "
 732                       "branches"), remote_name);
 733
 734  abort:
 735         strbuf_release(&note);
 736         free(url);
 737         fclose(fp);
 738         return rc;
 739 }
 740
 741 /*
 742  * We would want to bypass the object transfer altogether if
 743  * everything we are going to fetch already exists and is connected
 744  * locally.
 745  */
 746 static int quickfetch(struct ref *ref_map)
 747 {
 748         struct ref *rm = ref_map;
 749
 750         /*
 751          * If we are deepening a shallow clone we already have these
 752          * objects reachable.  Running rev-list here will return with
 753          * a good (0) exit status and we'll bypass the fetch that we
 754          * really need to perform.  Claiming failure now will ensure
 755          * we perform the network exchange to deepen our history.
 756          */
 757         if (depth)
 758                 return -1;
 759         return check_everything_connected(iterate_ref_map, 1, &rm);
 760 }
 761
 762 static int fetch_refs(struct transport *transport, struct ref *ref_map)
 763 {
 764         int ret = quickfetch(ref_map);
 765         if (ret)
 766                 ret = transport_fetch_refs(transport, ref_map);
 767         if (!ret)
 768                 ret |= store_updated_refs(transport->url,
 769                                 transport->remote->name,
 770                                 ref_map);
 771         transport_unlock_pack(transport);
 772         return ret;
 773 }
 774
 775 static int prune_refs(struct refspec *refs, int ref_count, struct ref *ref_map,
 776                 const char *raw_url)
 777 {
 778         int url_len, i, result = 0;
 779         struct ref *ref, *stale_refs = get_stale_heads(refs, ref_count, ref_map);
 780         char *url;
 781         const char *dangling_msg = dry_run
 782                 ? _("   (%s will become dangling)")
 783                 : _("   (%s has become dangling)");
 784
 785         if (raw_url)
 786                 url = transport_anonymize_url(raw_url);
 787         else
 788                 url = xstrdup("foreign");
 789
 790         url_len = strlen(url);
 791         for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 792                 ;
 793
 794         url_len = i + 1;
 795         if (4 < i && !strncmp(".git", url + i - 3, 4))
 796                 url_len = i - 3;
 797
 798         if (!dry_run) {
 799                 struct string_list refnames = STRING_LIST_INIT_NODUP;
 800
 801                 for (ref = stale_refs; ref; ref = ref->next)
 802                         string_list_append(&refnames, ref->name);
 803
 804                 result = delete_refs(&refnames);
 805                 string_list_clear(&refnames, 0);
 806         }
 807
 808         if (verbosity >= 0) {
 809                 for (ref = stale_refs; ref; ref = ref->next) {
 810                         if (!shown_url) {
 811                                 fprintf(stderr, _("From %.*s\n"), url_len, url);
 812                                 shown_url = 1;
 813                         }
 814                         fprintf(stderr, " x %-*s %-*s -> %s\n",
 815                                 TRANSPORT_SUMMARY(_("[deleted]")),
 816                                 REFCOL_WIDTH, _("(none)"), prettify_refname(ref->name));
 817                         warn_dangling_symref(stderr, dangling_msg, ref->name);
 818                 }
 819         }
 820
 821         free(url);
 822         free_refs(stale_refs);
 823         return result;
 824 }
 825
 826 static void check_not_current_branch(struct ref *ref_map)
 827 {
 828         struct branch *current_branch = branch_get(NULL);
 829
 830         if (is_bare_repository() || !current_branch)
 831                 return;
 832
 833         for (; ref_map; ref_map = ref_map->next)
 834                 if (ref_map->peer_ref && !strcmp(current_branch->refname,
 835                                         ref_map->peer_ref->name))
 836                         die(_("Refusing to fetch into current branch %s "
 837                             "of non-bare repository"), current_branch->refname);
 838 }
 839
 840 static int truncate_fetch_head(void)
 841 {
 842         const char *filename = git_path_fetch_head();
 843         FILE *fp = fopen_for_writing(filename);
 844
 845         if (!fp)
 846                 return error(_("cannot open %s: %s\n"), filename, strerror(errno));
 847         fclose(fp);
 848         return 0;
 849 }
 850
 851 static void set_option(struct transport *transport, const char *name, const char *value)
 852 {
 853         int r = transport_set_option(transport, name, value);
 854         if (r < 0)
 855                 die(_("Option \"%s\" value \"%s\" is not valid for %s"),
 856                     name, value, transport->url);
 857         if (r > 0)
 858                 warning(_("Option \"%s\" is ignored for %s\n"),
 859                         name, transport->url);
 860 }
 861
 862 static struct transport *prepare_transport(struct remote *remote)
 863 {
 864         struct transport *transport;
 865         transport = transport_get(remote, NULL);
 866         transport_set_verbosity(transport, verbosity, progress);
 867         if (upload_pack)
 868                 set_option(transport, TRANS_OPT_UPLOADPACK, upload_pack);
 869         if (keep)
 870                 set_option(transport, TRANS_OPT_KEEP, "yes");
 871         if (depth)
 872                 set_option(transport, TRANS_OPT_DEPTH, depth);
 873         if (update_shallow)
 874                 set_option(transport, TRANS_OPT_UPDATE_SHALLOW, "yes");
 875         return transport;
 876 }
 877
 878 static void backfill_tags(struct transport *transport, struct ref *ref_map)
 879 {
 880         if (transport->cannot_reuse) {
 881                 gsecondary = prepare_transport(transport->remote);
 882                 transport = gsecondary;
 883         }
 884
 885         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
 886         transport_set_option(transport, TRANS_OPT_DEPTH, "0");
 887         fetch_refs(transport, ref_map);
 888
 889         if (gsecondary) {
 890                 transport_disconnect(gsecondary);
 891                 gsecondary = NULL;
 892         }
 893 }
 894
 895 static int do_fetch(struct transport *transport,
 896                     struct refspec *refs, int ref_count)
 897 {
 898         struct string_list existing_refs = STRING_LIST_INIT_DUP;
 899         struct ref *ref_map;
 900         struct ref *rm;
 901         int autotags = (transport->remote->fetch_tags == 1);
 902         int retcode = 0;
 903
 904         for_each_ref(add_existing, &existing_refs);
 905
 906         if (tags == TAGS_DEFAULT) {
 907                 if (transport->remote->fetch_tags == 2)
 908                         tags = TAGS_SET;
 909                 if (transport->remote->fetch_tags == -1)
 910                         tags = TAGS_UNSET;
 911         }
 912
 913         if (!transport->get_refs_list || !transport->fetch)
 914                 die(_("Don't know how to fetch from %s"), transport->url);
 915
 916         /* if not appending, truncate FETCH_HEAD */
 917         if (!append && !dry_run) {
 918                 retcode = truncate_fetch_head();
 919                 if (retcode)
 920                         goto cleanup;
 921         }
 922
 923         ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
 924         if (!update_head_ok)
 925                 check_not_current_branch(ref_map);
 926
 927         for (rm = ref_map; rm; rm = rm->next) {
 928                 if (rm->peer_ref) {
 929                         struct string_list_item *peer_item =
 930                                 string_list_lookup(&existing_refs,
 931                                                    rm->peer_ref->name);
 932                         if (peer_item) {
 933                                 struct object_id *old_oid = peer_item->util;
 934                                 oidcpy(&rm->peer_ref->old_oid, old_oid);
 935                         }
 936                 }
 937         }
 938
 939         if (tags == TAGS_DEFAULT && autotags)
 940                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
 941         if (prune) {
 942                 /*
 943                  * We only prune based on refspecs specified
 944                  * explicitly (via command line or configuration); we
 945                  * don't care whether --tags was specified.
 946                  */
 947                 if (ref_count) {
 948                         prune_refs(refs, ref_count, ref_map, transport->url);
 949                 } else {
 950                         prune_refs(transport->remote->fetch,
 951                                    transport->remote->fetch_refspec_nr,
 952                                    ref_map,
 953                                    transport->url);
 954                 }
 955         }
 956         if (fetch_refs(transport, ref_map)) {
 957                 free_refs(ref_map);
 958                 retcode = 1;
 959                 goto cleanup;
 960         }
 961         free_refs(ref_map);
 962
 963         /* if neither --no-tags nor --tags was specified, do automated tag
 964          * following ... */
 965         if (tags == TAGS_DEFAULT && autotags) {
 966                 struct ref **tail = &ref_map;
 967                 ref_map = NULL;
 968                 find_non_local_tags(transport, &ref_map, &tail);
 969                 if (ref_map)
 970                         backfill_tags(transport, ref_map);
 971                 free_refs(ref_map);
 972         }
 973
 974  cleanup:
 975         string_list_clear(&existing_refs, 1);
 976         return retcode;
 977 }
 978
 979 static int get_one_remote_for_fetch(struct remote *remote, void *priv)
 980 {
 981         struct string_list *list = priv;
 982         if (!remote->skip_default_update)
 983                 string_list_append(list, remote->name);
 984         return 0;
 985 }
 986
 987 struct remote_group_data {
 988         const char *name;
 989         struct string_list *list;
 990 };
 991
 992 static int get_remote_group(const char *key, const char *value, void *priv)
 993 {
 994         struct remote_group_data *g = priv;
 995
 996         if (skip_prefix(key, "remotes.", &key) && !strcmp(key, g->name)) {
 997                 /* split list by white space */
 998                 while (*value) {
 999                         size_t wordlen = strcspn(value, " \t\n");
1000
1001                         if (wordlen >= 1)
1002                                 string_list_append(g->list,
1003                                                    xstrndup(value, wordlen));
1004                         value += wordlen + (value[wordlen] != '\0');
1005                 }
1006         }
1007
1008         return 0;
1009 }
1010
1011 static int add_remote_or_group(const char *name, struct string_list *list)
1012 {
1013         int prev_nr = list->nr;
1014         struct remote_group_data g;
1015         g.name = name; g.list = list;
1016
1017         git_config(get_remote_group, &g);
1018         if (list->nr == prev_nr) {
1019                 struct remote *remote;
1020                 if (!remote_is_configured(name))
1021                         return 0;
1022                 remote = remote_get(name);
1023                 string_list_append(list, remote->name);
1024         }
1025         return 1;
1026 }
1027
1028 static void add_options_to_argv(struct argv_array *argv)
1029 {
1030         if (dry_run)
1031                 argv_array_push(argv, "--dry-run");
1032         if (prune != -1)
1033                 argv_array_push(argv, prune ? "--prune" : "--no-prune");
1034         if (update_head_ok)
1035                 argv_array_push(argv, "--update-head-ok");
1036         if (force)
1037                 argv_array_push(argv, "--force");
1038         if (keep)
1039                 argv_array_push(argv, "--keep");
1040         if (recurse_submodules == RECURSE_SUBMODULES_ON)
1041                 argv_array_push(argv, "--recurse-submodules");
1042         else if (recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND)
1043                 argv_array_push(argv, "--recurse-submodules=on-demand");
1044         if (tags == TAGS_SET)
1045                 argv_array_push(argv, "--tags");
1046         else if (tags == TAGS_UNSET)
1047                 argv_array_push(argv, "--no-tags");
1048         if (verbosity >= 2)
1049                 argv_array_push(argv, "-v");
1050         if (verbosity >= 1)
1051                 argv_array_push(argv, "-v");
1052         else if (verbosity < 0)
1053                 argv_array_push(argv, "-q");
1054
1055 }
1056
1057 static int fetch_multiple(struct string_list *list)
1058 {
1059         int i, result = 0;
1060         struct argv_array argv = ARGV_ARRAY_INIT;
1061
1062         if (!append && !dry_run) {
1063                 int errcode = truncate_fetch_head();
1064                 if (errcode)
1065                         return errcode;
1066         }
1067
1068         argv_array_pushl(&argv, "fetch", "--append", NULL);
1069         add_options_to_argv(&argv);
1070
1071         for (i = 0; i < list->nr; i++) {
1072                 const char *name = list->items[i].string;
1073                 argv_array_push(&argv, name);
1074                 if (verbosity >= 0)
1075                         printf(_("Fetching %s\n"), name);
1076                 if (run_command_v_opt(argv.argv, RUN_GIT_CMD)) {
1077                         error(_("Could not fetch %s"), name);
1078                         result = 1;
1079                 }
1080                 argv_array_pop(&argv);
1081         }
1082
1083         argv_array_clear(&argv);
1084         return result;
1085 }
1086
1087 static int fetch_one(struct remote *remote, int argc, const char **argv)
1088 {
1089         static const char **refs = NULL;
1090         struct refspec *refspec;
1091         int ref_nr = 0;
1092         int exit_code;
1093
1094         if (!remote)
1095                 die(_("No remote repository specified.  Please, specify either a URL or a\n"
1096                     "remote name from which new revisions should be fetched."));
1097
1098         gtransport = prepare_transport(remote);
1099
1100         if (prune < 0) {
1101                 /* no command line request */
1102                 if (0 <= gtransport->remote->prune)
1103                         prune = gtransport->remote->prune;
1104                 else if (0 <= fetch_prune_config)
1105                         prune = fetch_prune_config;
1106                 else
1107                         prune = PRUNE_BY_DEFAULT;
1108         }
1109
1110         if (argc > 0) {
1111                 int j = 0;
1112                 int i;
1113                 refs = xcalloc(argc + 1, sizeof(const char *));
1114                 for (i = 0; i < argc; i++) {
1115                         if (!strcmp(argv[i], "tag")) {
1116                                 i++;
1117                                 if (i >= argc)
1118                                         die(_("You need to specify a tag name."));
1119                                 refs[j++] = xstrfmt("refs/tags/%s:refs/tags/%s",
1120                                                     argv[i], argv[i]);
1121                         } else
1122                                 refs[j++] = argv[i];
1123                 }
1124                 refs[j] = NULL;
1125                 ref_nr = j;
1126         }
1127
1128         sigchain_push_common(unlock_pack_on_signal);
1129         atexit(unlock_pack);
1130         refspec = parse_fetch_refspec(ref_nr, refs);
1131         exit_code = do_fetch(gtransport, refspec, ref_nr);
1132         free_refspec(ref_nr, refspec);
1133         transport_disconnect(gtransport);
1134         gtransport = NULL;
1135         return exit_code;
1136 }
1137
1138 int cmd_fetch(int argc, const char **argv, const char *prefix)
1139 {
1140         int i;
1141         struct string_list list = STRING_LIST_INIT_NODUP;
1142         struct remote *remote;
1143         int result = 0;
1144         struct argv_array argv_gc_auto = ARGV_ARRAY_INIT;
1145
1146         packet_trace_identity("fetch");
1147
1148         /* Record the command line for the reflog */
1149         strbuf_addstr(&default_rla, "fetch");
1150         for (i = 1; i < argc; i++)
1151                 strbuf_addf(&default_rla, " %s", argv[i]);
1152
1153         git_config(git_fetch_config, NULL);
1154
1155         argc = parse_options(argc, argv, prefix,
1156                              builtin_fetch_options, builtin_fetch_usage, 0);
1157
1158         if (unshallow) {
1159                 if (depth)
1160                         die(_("--depth and --unshallow cannot be used together"));
1161                 else if (!is_repository_shallow())
1162                         die(_("--unshallow on a complete repository does not make sense"));
1163                 else
1164                         depth = xstrfmt("%d", INFINITE_DEPTH);
1165         }
1166
1167         /* no need to be strict, transport_set_option() will validate it again */
1168         if (depth && atoi(depth) < 1)
1169                 die(_("depth %s is not a positive number"), depth);
1170
1171         if (recurse_submodules != RECURSE_SUBMODULES_OFF) {
1172                 if (recurse_submodules_default) {
1173                         int arg = parse_fetch_recurse_submodules_arg("--recurse-submodules-default", recurse_submodules_default);
1174                         set_config_fetch_recurse_submodules(arg);
1175                 }
1176                 gitmodules_config();
1177                 git_config(submodule_config, NULL);
1178         }
1179
1180         if (all) {
1181                 if (argc == 1)
1182                         die(_("fetch --all does not take a repository argument"));
1183                 else if (argc > 1)
1184                         die(_("fetch --all does not make sense with refspecs"));
1185                 (void) for_each_remote(get_one_remote_for_fetch, &list);
1186                 result = fetch_multiple(&list);
1187         } else if (argc == 0) {
1188                 /* No arguments -- use default remote */
1189                 remote = remote_get(NULL);
1190                 result = fetch_one(remote, argc, argv);
1191         } else if (multiple) {
1192                 /* All arguments are assumed to be remotes or groups */
1193                 for (i = 0; i < argc; i++)
1194                         if (!add_remote_or_group(argv[i], &list))
1195                                 die(_("No such remote or remote group: %s"), argv[i]);
1196                 result = fetch_multiple(&list);
1197         } else {
1198                 /* Single remote or group */
1199                 (void) add_remote_or_group(argv[0], &list);
1200                 if (list.nr > 1) {
1201                         /* More than one remote */
1202                         if (argc > 1)
1203                                 die(_("Fetching a group and specifying refspecs does not make sense"));
1204                         result = fetch_multiple(&list);
1205                 } else {
1206                         /* Zero or one remotes */
1207                         remote = remote_get(argv[0]);
1208                         result = fetch_one(remote, argc-1, argv+1);
1209                 }
1210         }
1211
1212         if (!result && (recurse_submodules != RECURSE_SUBMODULES_OFF)) {
1213                 struct argv_array options = ARGV_ARRAY_INIT;
1214
1215                 add_options_to_argv(&options);
1216                 result = fetch_populated_submodules(&options,
1217                                                     submodule_prefix,
1218                                                     recurse_submodules,
1219                                                     verbosity < 0,
1220                                                     max_children);
1221                 argv_array_clear(&options);
1222         }
1223
1224         /* All names were strdup()ed or strndup()ed */
1225         list.strdup_strings = 1;
1226         string_list_clear(&list, 0);
1227
1228         close_all_packs();
1229
1230         argv_array_pushl(&argv_gc_auto, "gc", "--auto", NULL);
1231         if (verbosity < 0)
1232                 argv_array_push(&argv_gc_auto, "--quiet");
1233         run_command_v_opt(argv_gc_auto.argv, RUN_GIT_CMD);
1234         argv_array_clear(&argv_gc_auto);
1235
1236         return result;
1237 }