git.oblomov.eu Git - git/blob - 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 enum transport_family family;
  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_BOOL('p', "prune", &prune,
 104                  N_("prune remote-tracking branches no longer on remote")),
 105         { OPTION_CALLBACK, 0, "recurse-submodules", NULL, N_("on-demand"),
 106                     N_("control recursive fetching of submodules"),
 107                     PARSE_OPT_OPTARG, option_parse_recurse_submodules },
 108         OPT_BOOL(0, "dry-run", &dry_run,
 109                  N_("dry run")),
 110         OPT_BOOL('k', "keep", &keep, N_("keep downloaded pack")),
 111         OPT_BOOL('u', "update-head-ok", &update_head_ok,
 112                     N_("allow updating of HEAD ref")),
 113         OPT_BOOL(0, "progress", &progress, N_("force progress reporting")),
 114         OPT_STRING(0, "depth", &depth, N_("depth"),
 115                    N_("deepen history of shallow clone")),
 116         { OPTION_SET_INT, 0, "unshallow", &unshallow, NULL,
 117                    N_("convert to a complete repository"),
 118                    PARSE_OPT_NONEG | PARSE_OPT_NOARG, NULL, 1 },
 119         { OPTION_STRING, 0, "submodule-prefix", &submodule_prefix, N_("dir"),
 120                    N_("prepend this to submodule path output"), PARSE_OPT_HIDDEN },
 121         { OPTION_STRING, 0, "recurse-submodules-default",
 122                    &recurse_submodules_default, NULL,
 123                    N_("default mode for recursion"), PARSE_OPT_HIDDEN },
 124         OPT_BOOL(0, "update-shallow", &update_shallow,
 125                  N_("accept refs that update .git/shallow")),
 126         { OPTION_CALLBACK, 0, "refmap", NULL, N_("refmap"),
 127           N_("specify fetch refmap"), PARSE_OPT_NONEG, parse_refmap_arg },
 128         OPT_SET_INT('4', "ipv4", &family, N_("use IPv4 addresses only"),
 129                         TRANSPORT_FAMILY_IPV4),
 130         OPT_SET_INT('6', "ipv6", &family, N_("use IPv6 addresses only"),
 131                         TRANSPORT_FAMILY_IPV6),
 132         OPT_END()
 133 };
 134
 135 static void unlock_pack(void)
 136 {
 137         if (gtransport)
 138                 transport_unlock_pack(gtransport);
 139         if (gsecondary)
 140                 transport_unlock_pack(gsecondary);
 141 }
 142
 143 static void unlock_pack_on_signal(int signo)
 144 {
 145         unlock_pack();
 146         sigchain_pop(signo);
 147         raise(signo);
 148 }
 149
 150 static void add_merge_config(struct ref **head,
 151                            const struct ref *remote_refs,
 152                            struct branch *branch,
 153                            struct ref ***tail)
 154 {
 155         int i;
 156
 157         for (i = 0; i < branch->merge_nr; i++) {
 158                 struct ref *rm, **old_tail = *tail;
 159                 struct refspec refspec;
 160
 161                 for (rm = *head; rm; rm = rm->next) {
 162                         if (branch_merge_matches(branch, i, rm->name)) {
 163                                 rm->fetch_head_status = FETCH_HEAD_MERGE;
 164                                 break;
 165                         }
 166                 }
 167                 if (rm)
 168                         continue;
 169
 170                 /*
 171                  * Not fetched to a remote-tracking branch?  We need to fetch
 172                  * it anyway to allow this branch's "branch.$name.merge"
 173                  * to be honored by 'git pull', but we do not have to
 174                  * fail if branch.$name.merge is misconfigured to point
 175                  * at a nonexisting branch.  If we were indeed called by
 176                  * 'git pull', it will notice the misconfiguration because
 177                  * there is no entry in the resulting FETCH_HEAD marked
 178                  * for merging.
 179                  */
 180                 memset(&refspec, 0, sizeof(refspec));
 181                 refspec.src = branch->merge[i]->src;
 182                 get_fetch_map(remote_refs, &refspec, tail, 1);
 183                 for (rm = *old_tail; rm; rm = rm->next)
 184                         rm->fetch_head_status = FETCH_HEAD_MERGE;
 185         }
 186 }
 187
 188 static int add_existing(const char *refname, const struct object_id *oid,
 189                         int flag, void *cbdata)
 190 {
 191         struct string_list *list = (struct string_list *)cbdata;
 192         struct string_list_item *item = string_list_insert(list, refname);
 193         struct object_id *old_oid = xmalloc(sizeof(*old_oid));
 194
 195         oidcpy(old_oid, oid);
 196         item->util = old_oid;
 197         return 0;
 198 }
 199
 200 static int will_fetch(struct ref **head, const unsigned char *sha1)
 201 {
 202         struct ref *rm = *head;
 203         while (rm) {
 204                 if (!hashcmp(rm->old_oid.hash, sha1))
 205                         return 1;
 206                 rm = rm->next;
 207         }
 208         return 0;
 209 }
 210
 211 static void find_non_local_tags(struct transport *transport,
 212                         struct ref **head,
 213                         struct ref ***tail)
 214 {
 215         struct string_list existing_refs = STRING_LIST_INIT_DUP;
 216         struct string_list remote_refs = STRING_LIST_INIT_NODUP;
 217         const struct ref *ref;
 218         struct string_list_item *item = NULL;
 219
 220         for_each_ref(add_existing, &existing_refs);
 221         for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
 222                 if (!starts_with(ref->name, "refs/tags/"))
 223                         continue;
 224
 225                 /*
 226                  * The peeled ref always follows the matching base
 227                  * ref, so if we see a peeled ref that we don't want
 228                  * to fetch then we can mark the ref entry in the list
 229                  * as one to ignore by setting util to NULL.
 230                  */
 231                 if (ends_with(ref->name, "^{}")) {
 232                         if (item && !has_object_file(&ref->old_oid) &&
 233                             !will_fetch(head, ref->old_oid.hash) &&
 234                             !has_sha1_file(item->util) &&
 235                             !will_fetch(head, item->util))
 236                                 item->util = NULL;
 237                         item = NULL;
 238                         continue;
 239                 }
 240
 241                 /*
 242                  * If item is non-NULL here, then we previously saw a
 243                  * ref not followed by a peeled reference, so we need
 244                  * to check if it is a lightweight tag that we want to
 245                  * fetch.
 246                  */
 247                 if (item && !has_sha1_file(item->util) &&
 248                     !will_fetch(head, item->util))
 249                         item->util = NULL;
 250
 251                 item = NULL;
 252
 253                 /* skip duplicates and refs that we already have */
 254                 if (string_list_has_string(&remote_refs, ref->name) ||
 255                     string_list_has_string(&existing_refs, ref->name))
 256                         continue;
 257
 258                 item = string_list_insert(&remote_refs, ref->name);
 259                 item->util = (void *)&ref->old_oid;
 260         }
 261         string_list_clear(&existing_refs, 1);
 262
 263         /*
 264          * We may have a final lightweight tag that needs to be
 265          * checked to see if it needs fetching.
 266          */
 267         if (item && !has_sha1_file(item->util) &&
 268             !will_fetch(head, item->util))
 269                 item->util = NULL;
 270
 271         /*
 272          * For all the tags in the remote_refs string list,
 273          * add them to the list of refs to be fetched
 274          */
 275         for_each_string_list_item(item, &remote_refs) {
 276                 /* Unless we have already decided to ignore this item... */
 277                 if (item->util)
 278                 {
 279                         struct ref *rm = alloc_ref(item->string);
 280                         rm->peer_ref = alloc_ref(item->string);
 281                         oidcpy(&rm->old_oid, item->util);
 282                         **tail = rm;
 283                         *tail = &rm->next;
 284                 }
 285         }
 286
 287         string_list_clear(&remote_refs, 0);
 288 }
 289
 290 static struct ref *get_ref_map(struct transport *transport,
 291                                struct refspec *refspecs, int refspec_count,
 292                                int tags, int *autotags)
 293 {
 294         int i;
 295         struct ref *rm;
 296         struct ref *ref_map = NULL;
 297         struct ref **tail = &ref_map;
 298
 299         /* opportunistically-updated references: */
 300         struct ref *orefs = NULL, **oref_tail = &orefs;
 301
 302         const struct ref *remote_refs = transport_get_remote_refs(transport);
 303
 304         if (refspec_count) {
 305                 struct refspec *fetch_refspec;
 306                 int fetch_refspec_nr;
 307
 308                 for (i = 0; i < refspec_count; i++) {
 309                         get_fetch_map(remote_refs, &refspecs[i], &tail, 0);
 310                         if (refspecs[i].dst && refspecs[i].dst[0])
 311                                 *autotags = 1;
 312                 }
 313                 /* Merge everything on the command line (but not --tags) */
 314                 for (rm = ref_map; rm; rm = rm->next)
 315                         rm->fetch_head_status = FETCH_HEAD_MERGE;
 316
 317                 /*
 318                  * For any refs that we happen to be fetching via
 319                  * command-line arguments, the destination ref might
 320                  * have been missing or have been different than the
 321                  * remote-tracking ref that would be derived from the
 322                  * configured refspec.  In these cases, we want to
 323                  * take the opportunity to update their configured
 324                  * remote-tracking reference.  However, we do not want
 325                  * to mention these entries in FETCH_HEAD at all, as
 326                  * they would simply be duplicates of existing
 327                  * entries, so we set them FETCH_HEAD_IGNORE below.
 328                  *
 329                  * We compute these entries now, based only on the
 330                  * refspecs specified on the command line.  But we add
 331                  * them to the list following the refspecs resulting
 332                  * from the tags option so that one of the latter,
 333                  * which has FETCH_HEAD_NOT_FOR_MERGE, is not removed
 334                  * by ref_remove_duplicates() in favor of one of these
 335                  * opportunistic entries with FETCH_HEAD_IGNORE.
 336                  */
 337                 if (refmap_array) {
 338                         fetch_refspec = parse_fetch_refspec(refmap_nr, refmap_array);
 339                         fetch_refspec_nr = refmap_nr;
 340                 } else {
 341                         fetch_refspec = transport->remote->fetch;
 342                         fetch_refspec_nr = transport->remote->fetch_refspec_nr;
 343                 }
 344
 345                 for (i = 0; i < fetch_refspec_nr; i++)
 346                         get_fetch_map(ref_map, &fetch_refspec[i], &oref_tail, 1);
 347
 348                 if (tags == TAGS_SET)
 349                         get_fetch_map(remote_refs, tag_refspec, &tail, 0);
 350         } else if (refmap_array) {
 351                 die("--refmap option is only meaningful with command-line refspec(s).");
 352         } else {
 353                 /* Use the defaults */
 354                 struct remote *remote = transport->remote;
 355                 struct branch *branch = branch_get(NULL);
 356                 int has_merge = branch_has_merge_config(branch);
 357                 if (remote &&
 358                     (remote->fetch_refspec_nr ||
 359                      /* Note: has_merge implies non-NULL branch->remote_name */
 360                      (has_merge && !strcmp(branch->remote_name, remote->name)))) {
 361                         for (i = 0; i < remote->fetch_refspec_nr; i++) {
 362                                 get_fetch_map(remote_refs, &remote->fetch[i], &tail, 0);
 363                                 if (remote->fetch[i].dst &&
 364                                     remote->fetch[i].dst[0])
 365                                         *autotags = 1;
 366                                 if (!i && !has_merge && ref_map &&
 367                                     !remote->fetch[0].pattern)
 368                                         ref_map->fetch_head_status = FETCH_HEAD_MERGE;
 369                         }
 370                         /*
 371                          * if the remote we're fetching from is the same
 372                          * as given in branch.<name>.remote, we add the
 373                          * ref given in branch.<name>.merge, too.
 374                          *
 375                          * Note: has_merge implies non-NULL branch->remote_name
 376                          */
 377                         if (has_merge &&
 378                             !strcmp(branch->remote_name, remote->name))
 379                                 add_merge_config(&ref_map, remote_refs, branch, &tail);
 380                 } else {
 381                         ref_map = get_remote_ref(remote_refs, "HEAD");
 382                         if (!ref_map)
 383                                 die(_("Couldn't find remote ref HEAD"));
 384                         ref_map->fetch_head_status = FETCH_HEAD_MERGE;
 385                         tail = &ref_map->next;
 386                 }
 387         }
 388
 389         if (tags == TAGS_SET)
 390                 /* also fetch all tags */
 391                 get_fetch_map(remote_refs, tag_refspec, &tail, 0);
 392         else if (tags == TAGS_DEFAULT && *autotags)
 393                 find_non_local_tags(transport, &ref_map, &tail);
 394
 395         /* Now append any refs to be updated opportunistically: */
 396         *tail = orefs;
 397         for (rm = orefs; rm; rm = rm->next) {
 398                 rm->fetch_head_status = FETCH_HEAD_IGNORE;
 399                 tail = &rm->next;
 400         }
 401
 402         return ref_remove_duplicates(ref_map);
 403 }
 404
 405 #define STORE_REF_ERROR_OTHER 1
 406 #define STORE_REF_ERROR_DF_CONFLICT 2
 407
 408 static int s_update_ref(const char *action,
 409                         struct ref *ref,
 410                         int check_old)
 411 {
 412         char msg[1024];
 413         char *rla = getenv("GIT_REFLOG_ACTION");
 414         struct ref_transaction *transaction;
 415         struct strbuf err = STRBUF_INIT;
 416         int ret, df_conflict = 0;
 417
 418         if (dry_run)
 419                 return 0;
 420         if (!rla)
 421                 rla = default_rla.buf;
 422         snprintf(msg, sizeof(msg), "%s: %s", rla, action);
 423
 424         transaction = ref_transaction_begin(&err);
 425         if (!transaction ||
 426             ref_transaction_update(transaction, ref->name,
 427                                    ref->new_oid.hash,
 428                                    check_old ? ref->old_oid.hash : NULL,
 429                                    0, msg, &err))
 430                 goto fail;
 431
 432         ret = ref_transaction_commit(transaction, &err);
 433         if (ret) {
 434                 df_conflict = (ret == TRANSACTION_NAME_CONFLICT);
 435                 goto fail;
 436         }
 437
 438         ref_transaction_free(transaction);
 439         strbuf_release(&err);
 440         return 0;
 441 fail:
 442         ref_transaction_free(transaction);
 443         error("%s", err.buf);
 444         strbuf_release(&err);
 445         return df_conflict ? STORE_REF_ERROR_DF_CONFLICT
 446                            : STORE_REF_ERROR_OTHER;
 447 }
 448
 449 #define REFCOL_WIDTH  10
 450
 451 static int update_local_ref(struct ref *ref,
 452                             const char *remote,
 453                             const struct ref *remote_ref,
 454                             struct strbuf *display)
 455 {
 456         struct commit *current = NULL, *updated;
 457         enum object_type type;
 458         struct branch *current_branch = branch_get(NULL);
 459         const char *pretty_ref = prettify_refname(ref->name);
 460
 461         type = sha1_object_info(ref->new_oid.hash, NULL);
 462         if (type < 0)
 463                 die(_("object %s not found"), oid_to_hex(&ref->new_oid));
 464
 465         if (!oidcmp(&ref->old_oid, &ref->new_oid)) {
 466                 if (verbosity > 0)
 467                         strbuf_addf(display, "= %-*s %-*s -> %s",
 468                                     TRANSPORT_SUMMARY(_("[up to date]")),
 469                                     REFCOL_WIDTH, remote, pretty_ref);
 470                 return 0;
 471         }
 472
 473         if (current_branch &&
 474             !strcmp(ref->name, current_branch->name) &&
 475             !(update_head_ok || is_bare_repository()) &&
 476             !is_null_oid(&ref->old_oid)) {
 477                 /*
 478                  * If this is the head, and it's not okay to update
 479                  * the head, and the old value of the head isn't empty...
 480                  */
 481                 strbuf_addf(display,
 482                             _("! %-*s %-*s -> %s  (can't fetch in current branch)"),
 483                             TRANSPORT_SUMMARY(_("[rejected]")),
 484                             REFCOL_WIDTH, remote, pretty_ref);
 485                 return 1;
 486         }
 487
 488         if (!is_null_oid(&ref->old_oid) &&
 489             starts_with(ref->name, "refs/tags/")) {
 490                 int r;
 491                 r = s_update_ref("updating tag", ref, 0);
 492                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 493                             r ? '!' : '-',
 494                             TRANSPORT_SUMMARY(_("[tag update]")),
 495                             REFCOL_WIDTH, remote, pretty_ref,
 496                             r ? _("  (unable to update local ref)") : "");
 497                 return r;
 498         }
 499
 500         current = lookup_commit_reference_gently(ref->old_oid.hash, 1);
 501         updated = lookup_commit_reference_gently(ref->new_oid.hash, 1);
 502         if (!current || !updated) {
 503                 const char *msg;
 504                 const char *what;
 505                 int r;
 506                 /*
 507                  * Nicely describe the new ref we're fetching.
 508                  * Base this on the remote's ref name, as it's
 509                  * more likely to follow a standard layout.
 510                  */
 511                 const char *name = remote_ref ? remote_ref->name : "";
 512                 if (starts_with(name, "refs/tags/")) {
 513                         msg = "storing tag";
 514                         what = _("[new tag]");
 515                 } else if (starts_with(name, "refs/heads/")) {
 516                         msg = "storing head";
 517                         what = _("[new branch]");
 518                 } else {
 519                         msg = "storing ref";
 520                         what = _("[new ref]");
 521                 }
 522
 523                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 524                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 525                         check_for_new_submodule_commits(ref->new_oid.hash);
 526                 r = s_update_ref(msg, ref, 0);
 527                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 528                             r ? '!' : '*',
 529                             TRANSPORT_SUMMARY(what),
 530                             REFCOL_WIDTH, remote, pretty_ref,
 531                             r ? _("  (unable to update local ref)") : "");
 532                 return r;
 533         }
 534
 535         if (in_merge_bases(current, updated)) {
 536                 struct strbuf quickref = STRBUF_INIT;
 537                 int r;
 538                 strbuf_add_unique_abbrev(&quickref, current->object.oid.hash, DEFAULT_ABBREV);
 539                 strbuf_addstr(&quickref, "..");
 540                 strbuf_add_unique_abbrev(&quickref, ref->new_oid.hash, DEFAULT_ABBREV);
 541                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 542                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 543                         check_for_new_submodule_commits(ref->new_oid.hash);
 544                 r = s_update_ref("fast-forward", ref, 1);
 545                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 546                             r ? '!' : ' ',
 547                             TRANSPORT_SUMMARY_WIDTH, quickref.buf,
 548                             REFCOL_WIDTH, remote, pretty_ref,
 549                             r ? _("  (unable to update local ref)") : "");
 550                 strbuf_release(&quickref);
 551                 return r;
 552         } else if (force || ref->force) {
 553                 struct strbuf quickref = STRBUF_INIT;
 554                 int r;
 555                 strbuf_add_unique_abbrev(&quickref, current->object.oid.hash, DEFAULT_ABBREV);
 556                 strbuf_addstr(&quickref, "...");
 557                 strbuf_add_unique_abbrev(&quickref, ref->new_oid.hash, DEFAULT_ABBREV);
 558                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 559                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 560                         check_for_new_submodule_commits(ref->new_oid.hash);
 561                 r = s_update_ref("forced-update", ref, 1);
 562                 strbuf_addf(display, "%c %-*s %-*s -> %s  (%s)",
 563                             r ? '!' : '+',
 564                             TRANSPORT_SUMMARY_WIDTH, quickref.buf,
 565                             REFCOL_WIDTH, remote, pretty_ref,
 566                             r ? _("unable to update local ref") : _("forced update"));
 567                 strbuf_release(&quickref);
 568                 return r;
 569         } else {
 570                 strbuf_addf(display, "! %-*s %-*s -> %s  %s",
 571                             TRANSPORT_SUMMARY(_("[rejected]")),
 572                             REFCOL_WIDTH, remote, pretty_ref,
 573                             _("(non-fast-forward)"));
 574                 return 1;
 575         }
 576 }
 577
 578 static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
 579 {
 580         struct ref **rm = cb_data;
 581         struct ref *ref = *rm;
 582
 583         while (ref && ref->status == REF_STATUS_REJECT_SHALLOW)
 584                 ref = ref->next;
 585         if (!ref)
 586                 return -1; /* end of the list */
 587         *rm = ref->next;
 588         hashcpy(sha1, ref->old_oid.hash);
 589         return 0;
 590 }
 591
 592 static int store_updated_refs(const char *raw_url, const char *remote_name,
 593                 struct ref *ref_map)
 594 {
 595         FILE *fp;
 596         struct commit *commit;
 597         int url_len, i, rc = 0;
 598         struct strbuf note = STRBUF_INIT;
 599         const char *what, *kind;
 600         struct ref *rm;
 601         char *url;
 602         const char *filename = dry_run ? "/dev/null" : git_path_fetch_head();
 603         int want_status;
 604
 605         fp = fopen(filename, "a");
 606         if (!fp)
 607                 return error(_("cannot open %s: %s\n"), filename, strerror(errno));
 608
 609         if (raw_url)
 610                 url = transport_anonymize_url(raw_url);
 611         else
 612                 url = xstrdup("foreign");
 613
 614         rm = ref_map;
 615         if (check_everything_connected(iterate_ref_map, 0, &rm)) {
 616                 rc = error(_("%s did not send all necessary objects\n"), url);
 617                 goto abort;
 618         }
 619
 620         /*
 621          * We do a pass for each fetch_head_status type in their enum order, so
 622          * merged entries are written before not-for-merge. That lets readers
 623          * use FETCH_HEAD as a refname to refer to the ref to be merged.
 624          */
 625         for (want_status = FETCH_HEAD_MERGE;
 626              want_status <= FETCH_HEAD_IGNORE;
 627              want_status++) {
 628                 for (rm = ref_map; rm; rm = rm->next) {
 629                         struct ref *ref = NULL;
 630                         const char *merge_status_marker = "";
 631
 632                         if (rm->status == REF_STATUS_REJECT_SHALLOW) {
 633                                 if (want_status == FETCH_HEAD_MERGE)
 634                                         warning(_("reject %s because shallow roots are not allowed to be updated"),
 635                                                 rm->peer_ref ? rm->peer_ref->name : rm->name);
 636                                 continue;
 637                         }
 638
 639                         commit = lookup_commit_reference_gently(rm->old_oid.hash, 1);
 640                         if (!commit)
 641                                 rm->fetch_head_status = FETCH_HEAD_NOT_FOR_MERGE;
 642
 643                         if (rm->fetch_head_status != want_status)
 644                                 continue;
 645
 646                         if (rm->peer_ref) {
 647                                 ref = alloc_ref(rm->peer_ref->name);
 648                                 oidcpy(&ref->old_oid, &rm->peer_ref->old_oid);
 649                                 oidcpy(&ref->new_oid, &rm->old_oid);
 650                                 ref->force = rm->peer_ref->force;
 651                         }
 652
 653
 654                         if (!strcmp(rm->name, "HEAD")) {
 655                                 kind = "";
 656                                 what = "";
 657                         }
 658                         else if (starts_with(rm->name, "refs/heads/")) {
 659                                 kind = "branch";
 660                                 what = rm->name + 11;
 661                         }
 662                         else if (starts_with(rm->name, "refs/tags/")) {
 663                                 kind = "tag";
 664                                 what = rm->name + 10;
 665                         }
 666                         else if (starts_with(rm->name, "refs/remotes/")) {
 667                                 kind = "remote-tracking branch";
 668                                 what = rm->name + 13;
 669                         }
 670                         else {
 671                                 kind = "";
 672                                 what = rm->name;
 673                         }
 674
 675                         url_len = strlen(url);
 676                         for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 677                                 ;
 678                         url_len = i + 1;
 679                         if (4 < i && !strncmp(".git", url + i - 3, 4))
 680                                 url_len = i - 3;
 681
 682                         strbuf_reset(&note);
 683                         if (*what) {
 684                                 if (*kind)
 685                                         strbuf_addf(&note, "%s ", kind);
 686                                 strbuf_addf(&note, "'%s' of ", what);
 687                         }
 688                         switch (rm->fetch_head_status) {
 689                         case FETCH_HEAD_NOT_FOR_MERGE:
 690                                 merge_status_marker = "not-for-merge";
 691                                 /* fall-through */
 692                         case FETCH_HEAD_MERGE:
 693                                 fprintf(fp, "%s\t%s\t%s",
 694                                         oid_to_hex(&rm->old_oid),
 695                                         merge_status_marker,
 696                                         note.buf);
 697                                 for (i = 0; i < url_len; ++i)
 698                                         if ('\n' == url[i])
 699                                                 fputs("\\n", fp);
 700                                         else
 701                                                 fputc(url[i], fp);
 702                                 fputc('\n', fp);
 703                                 break;
 704                         default:
 705                                 /* do not write anything to FETCH_HEAD */
 706                                 break;
 707                         }
 708
 709                         strbuf_reset(&note);
 710                         if (ref) {
 711                                 rc |= update_local_ref(ref, what, rm, &note);
 712                                 free(ref);
 713                         } else
 714                                 strbuf_addf(&note, "* %-*s %-*s -> FETCH_HEAD",
 715                                             TRANSPORT_SUMMARY_WIDTH,
 716                                             *kind ? kind : "branch",
 717                                             REFCOL_WIDTH,
 718                                             *what ? what : "HEAD");
 719                         if (note.len) {
 720                                 if (verbosity >= 0 && !shown_url) {
 721                                         fprintf(stderr, _("From %.*s\n"),
 722                                                         url_len, url);
 723                                         shown_url = 1;
 724                                 }
 725                                 if (verbosity >= 0)
 726                                         fprintf(stderr, " %s\n", note.buf);
 727                         }
 728                 }
 729         }
 730
 731         if (rc & STORE_REF_ERROR_DF_CONFLICT)
 732                 error(_("some local refs could not be updated; try running\n"
 733                       " 'git remote prune %s' to remove any old, conflicting "
 734                       "branches"), remote_name);
 735
 736  abort:
 737         strbuf_release(&note);
 738         free(url);
 739         fclose(fp);
 740         return rc;
 741 }
 742
 743 /*
 744  * We would want to bypass the object transfer altogether if
 745  * everything we are going to fetch already exists and is connected
 746  * locally.
 747  */
 748 static int quickfetch(struct ref *ref_map)
 749 {
 750         struct ref *rm = ref_map;
 751
 752         /*
 753          * If we are deepening a shallow clone we already have these
 754          * objects reachable.  Running rev-list here will return with
 755          * a good (0) exit status and we'll bypass the fetch that we
 756          * really need to perform.  Claiming failure now will ensure
 757          * we perform the network exchange to deepen our history.
 758          */
 759         if (depth)
 760                 return -1;
 761         return check_everything_connected(iterate_ref_map, 1, &rm);
 762 }
 763
 764 static int fetch_refs(struct transport *transport, struct ref *ref_map)
 765 {
 766         int ret = quickfetch(ref_map);
 767         if (ret)
 768                 ret = transport_fetch_refs(transport, ref_map);
 769         if (!ret)
 770                 ret |= store_updated_refs(transport->url,
 771                                 transport->remote->name,
 772                                 ref_map);
 773         transport_unlock_pack(transport);
 774         return ret;
 775 }
 776
 777 static int prune_refs(struct refspec *refs, int ref_count, struct ref *ref_map,
 778                 const char *raw_url)
 779 {
 780         int url_len, i, result = 0;
 781         struct ref *ref, *stale_refs = get_stale_heads(refs, ref_count, ref_map);
 782         char *url;
 783         const char *dangling_msg = dry_run
 784                 ? _("   (%s will become dangling)")
 785                 : _("   (%s has become dangling)");
 786
 787         if (raw_url)
 788                 url = transport_anonymize_url(raw_url);
 789         else
 790                 url = xstrdup("foreign");
 791
 792         url_len = strlen(url);
 793         for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 794                 ;
 795
 796         url_len = i + 1;
 797         if (4 < i && !strncmp(".git", url + i - 3, 4))
 798                 url_len = i - 3;
 799
 800         if (!dry_run) {
 801                 struct string_list refnames = STRING_LIST_INIT_NODUP;
 802
 803                 for (ref = stale_refs; ref; ref = ref->next)
 804                         string_list_append(&refnames, ref->name);
 805
 806                 result = delete_refs(&refnames);
 807                 string_list_clear(&refnames, 0);
 808         }
 809
 810         if (verbosity >= 0) {
 811                 for (ref = stale_refs; ref; ref = ref->next) {
 812                         if (!shown_url) {
 813                                 fprintf(stderr, _("From %.*s\n"), url_len, url);
 814                                 shown_url = 1;
 815                         }
 816                         fprintf(stderr, " x %-*s %-*s -> %s\n",
 817                                 TRANSPORT_SUMMARY(_("[deleted]")),
 818                                 REFCOL_WIDTH, _("(none)"), prettify_refname(ref->name));
 819                         warn_dangling_symref(stderr, dangling_msg, ref->name);
 820                 }
 821         }
 822
 823         free(url);
 824         free_refs(stale_refs);
 825         return result;
 826 }
 827
 828 static void check_not_current_branch(struct ref *ref_map)
 829 {
 830         struct branch *current_branch = branch_get(NULL);
 831
 832         if (is_bare_repository() || !current_branch)
 833                 return;
 834
 835         for (; ref_map; ref_map = ref_map->next)
 836                 if (ref_map->peer_ref && !strcmp(current_branch->refname,
 837                                         ref_map->peer_ref->name))
 838                         die(_("Refusing to fetch into current branch %s "
 839                             "of non-bare repository"), current_branch->refname);
 840 }
 841
 842 static int truncate_fetch_head(void)
 843 {
 844         const char *filename = git_path_fetch_head();
 845         FILE *fp = fopen(filename, "w");
 846
 847         if (!fp)
 848                 return error(_("cannot open %s: %s\n"), filename, strerror(errno));
 849         fclose(fp);
 850         return 0;
 851 }
 852
 853 static void set_option(struct transport *transport, const char *name, const char *value)
 854 {
 855         int r = transport_set_option(transport, name, value);
 856         if (r < 0)
 857                 die(_("Option \"%s\" value \"%s\" is not valid for %s"),
 858                     name, value, transport->url);
 859         if (r > 0)
 860                 warning(_("Option \"%s\" is ignored for %s\n"),
 861                         name, transport->url);
 862 }
 863
 864 static struct transport *prepare_transport(struct remote *remote)
 865 {
 866         struct transport *transport;
 867         transport = transport_get(remote, NULL);
 868         transport_set_verbosity(transport, verbosity, progress);
 869         transport->family = family;
 870         if (upload_pack)
 871                 set_option(transport, TRANS_OPT_UPLOADPACK, upload_pack);
 872         if (keep)
 873                 set_option(transport, TRANS_OPT_KEEP, "yes");
 874         if (depth)
 875                 set_option(transport, TRANS_OPT_DEPTH, depth);
 876         if (update_shallow)
 877                 set_option(transport, TRANS_OPT_UPDATE_SHALLOW, "yes");
 878         return transport;
 879 }
 880
 881 static void backfill_tags(struct transport *transport, struct ref *ref_map)
 882 {
 883         if (transport->cannot_reuse) {
 884                 gsecondary = prepare_transport(transport->remote);
 885                 transport = gsecondary;
 886         }
 887
 888         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
 889         transport_set_option(transport, TRANS_OPT_DEPTH, "0");
 890         fetch_refs(transport, ref_map);
 891
 892         if (gsecondary) {
 893                 transport_disconnect(gsecondary);
 894                 gsecondary = NULL;
 895         }
 896 }
 897
 898 static int do_fetch(struct transport *transport,
 899                     struct refspec *refs, int ref_count)
 900 {
 901         struct string_list existing_refs = STRING_LIST_INIT_DUP;
 902         struct ref *ref_map;
 903         struct ref *rm;
 904         int autotags = (transport->remote->fetch_tags == 1);
 905         int retcode = 0;
 906
 907         for_each_ref(add_existing, &existing_refs);
 908
 909         if (tags == TAGS_DEFAULT) {
 910                 if (transport->remote->fetch_tags == 2)
 911                         tags = TAGS_SET;
 912                 if (transport->remote->fetch_tags == -1)
 913                         tags = TAGS_UNSET;
 914         }
 915
 916         if (!transport->get_refs_list || !transport->fetch)
 917                 die(_("Don't know how to fetch from %s"), transport->url);
 918
 919         /* if not appending, truncate FETCH_HEAD */
 920         if (!append && !dry_run) {
 921                 retcode = truncate_fetch_head();
 922                 if (retcode)
 923                         goto cleanup;
 924         }
 925
 926         ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
 927         if (!update_head_ok)
 928                 check_not_current_branch(ref_map);
 929
 930         for (rm = ref_map; rm; rm = rm->next) {
 931                 if (rm->peer_ref) {
 932                         struct string_list_item *peer_item =
 933                                 string_list_lookup(&existing_refs,
 934                                                    rm->peer_ref->name);
 935                         if (peer_item) {
 936                                 struct object_id *old_oid = peer_item->util;
 937                                 oidcpy(&rm->peer_ref->old_oid, old_oid);
 938                         }
 939                 }
 940         }
 941
 942         if (tags == TAGS_DEFAULT && autotags)
 943                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
 944         if (prune) {
 945                 /*
 946                  * We only prune based on refspecs specified
 947                  * explicitly (via command line or configuration); we
 948                  * don't care whether --tags was specified.
 949                  */
 950                 if (ref_count) {
 951                         prune_refs(refs, ref_count, ref_map, transport->url);
 952                 } else {
 953                         prune_refs(transport->remote->fetch,
 954                                    transport->remote->fetch_refspec_nr,
 955                                    ref_map,
 956                                    transport->url);
 957                 }
 958         }
 959         if (fetch_refs(transport, ref_map)) {
 960                 free_refs(ref_map);
 961                 retcode = 1;
 962                 goto cleanup;
 963         }
 964         free_refs(ref_map);
 965
 966         /* if neither --no-tags nor --tags was specified, do automated tag
 967          * following ... */
 968         if (tags == TAGS_DEFAULT && autotags) {
 969                 struct ref **tail = &ref_map;
 970                 ref_map = NULL;
 971                 find_non_local_tags(transport, &ref_map, &tail);
 972                 if (ref_map)
 973                         backfill_tags(transport, ref_map);
 974                 free_refs(ref_map);
 975         }
 976
 977  cleanup:
 978         string_list_clear(&existing_refs, 1);
 979         return retcode;
 980 }
 981
 982 static int get_one_remote_for_fetch(struct remote *remote, void *priv)
 983 {
 984         struct string_list *list = priv;
 985         if (!remote->skip_default_update)
 986                 string_list_append(list, remote->name);
 987         return 0;
 988 }
 989
 990 struct remote_group_data {
 991         const char *name;
 992         struct string_list *list;
 993 };
 994
 995 static int get_remote_group(const char *key, const char *value, void *priv)
 996 {
 997         struct remote_group_data *g = priv;
 998
 999         if (skip_prefix(key, "remotes.", &key) && !strcmp(key, g->name)) {
1000                 /* split list by white space */
1001                 while (*value) {
1002                         size_t wordlen = strcspn(value, " \t\n");
1003
1004                         if (wordlen >= 1)
1005                                 string_list_append(g->list,
1006                                                    xstrndup(value, wordlen));
1007                         value += wordlen + (value[wordlen] != '\0');
1008                 }
1009         }
1010
1011         return 0;
1012 }
1013
1014 static int add_remote_or_group(const char *name, struct string_list *list)
1015 {
1016         int prev_nr = list->nr;
1017         struct remote_group_data g;
1018         g.name = name; g.list = list;
1019
1020         git_config(get_remote_group, &g);
1021         if (list->nr == prev_nr) {
1022                 struct remote *remote;
1023                 if (!remote_is_configured(name))
1024                         return 0;
1025                 remote = remote_get(name);
1026                 string_list_append(list, remote->name);
1027         }
1028         return 1;
1029 }
1030
1031 static void add_options_to_argv(struct argv_array *argv)
1032 {
1033         if (dry_run)
1034                 argv_array_push(argv, "--dry-run");
1035         if (prune != -1)
1036                 argv_array_push(argv, prune ? "--prune" : "--no-prune");
1037         if (update_head_ok)
1038                 argv_array_push(argv, "--update-head-ok");
1039         if (force)
1040                 argv_array_push(argv, "--force");
1041         if (keep)
1042                 argv_array_push(argv, "--keep");
1043         if (recurse_submodules == RECURSE_SUBMODULES_ON)
1044                 argv_array_push(argv, "--recurse-submodules");
1045         else if (recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND)
1046                 argv_array_push(argv, "--recurse-submodules=on-demand");
1047         if (tags == TAGS_SET)
1048                 argv_array_push(argv, "--tags");
1049         else if (tags == TAGS_UNSET)
1050                 argv_array_push(argv, "--no-tags");
1051         if (verbosity >= 2)
1052                 argv_array_push(argv, "-v");
1053         if (verbosity >= 1)
1054                 argv_array_push(argv, "-v");
1055         else if (verbosity < 0)
1056                 argv_array_push(argv, "-q");
1057
1058 }
1059
1060 static int fetch_multiple(struct string_list *list)
1061 {
1062         int i, result = 0;
1063         struct argv_array argv = ARGV_ARRAY_INIT;
1064
1065         if (!append && !dry_run) {
1066                 int errcode = truncate_fetch_head();
1067                 if (errcode)
1068                         return errcode;
1069         }
1070
1071         argv_array_pushl(&argv, "fetch", "--append", NULL);
1072         add_options_to_argv(&argv);
1073
1074         for (i = 0; i < list->nr; i++) {
1075                 const char *name = list->items[i].string;
1076                 argv_array_push(&argv, name);
1077                 if (verbosity >= 0)
1078                         printf(_("Fetching %s\n"), name);
1079                 if (run_command_v_opt(argv.argv, RUN_GIT_CMD)) {
1080                         error(_("Could not fetch %s"), name);
1081                         result = 1;
1082                 }
1083                 argv_array_pop(&argv);
1084         }
1085
1086         argv_array_clear(&argv);
1087         return result;
1088 }
1089
1090 static int fetch_one(struct remote *remote, int argc, const char **argv)
1091 {
1092         static const char **refs = NULL;
1093         struct refspec *refspec;
1094         int ref_nr = 0;
1095         int exit_code;
1096
1097         if (!remote)
1098                 die(_("No remote repository specified.  Please, specify either a URL or a\n"
1099                     "remote name from which new revisions should be fetched."));
1100
1101         gtransport = prepare_transport(remote);
1102
1103         if (prune < 0) {
1104                 /* no command line request */
1105                 if (0 <= gtransport->remote->prune)
1106                         prune = gtransport->remote->prune;
1107                 else if (0 <= fetch_prune_config)
1108                         prune = fetch_prune_config;
1109                 else
1110                         prune = PRUNE_BY_DEFAULT;
1111         }
1112
1113         if (argc > 0) {
1114                 int j = 0;
1115                 int i;
1116                 refs = xcalloc(argc + 1, sizeof(const char *));
1117                 for (i = 0; i < argc; i++) {
1118                         if (!strcmp(argv[i], "tag")) {
1119                                 i++;
1120                                 if (i >= argc)
1121                                         die(_("You need to specify a tag name."));
1122                                 refs[j++] = xstrfmt("refs/tags/%s:refs/tags/%s",
1123                                                     argv[i], argv[i]);
1124                         } else
1125                                 refs[j++] = argv[i];
1126                 }
1127                 refs[j] = NULL;
1128                 ref_nr = j;
1129         }
1130
1131         sigchain_push_common(unlock_pack_on_signal);
1132         atexit(unlock_pack);
1133         refspec = parse_fetch_refspec(ref_nr, refs);
1134         exit_code = do_fetch(gtransport, refspec, ref_nr);
1135         free_refspec(ref_nr, refspec);
1136         transport_disconnect(gtransport);
1137         gtransport = NULL;
1138         return exit_code;
1139 }
1140
1141 int cmd_fetch(int argc, const char **argv, const char *prefix)
1142 {
1143         int i;
1144         struct string_list list = STRING_LIST_INIT_NODUP;
1145         struct remote *remote;
1146         int result = 0;
1147         struct argv_array argv_gc_auto = ARGV_ARRAY_INIT;
1148
1149         packet_trace_identity("fetch");
1150
1151         /* Record the command line for the reflog */
1152         strbuf_addstr(&default_rla, "fetch");
1153         for (i = 1; i < argc; i++)
1154                 strbuf_addf(&default_rla, " %s", argv[i]);
1155
1156         git_config(git_fetch_config, NULL);
1157
1158         argc = parse_options(argc, argv, prefix,
1159                              builtin_fetch_options, builtin_fetch_usage, 0);
1160
1161         if (unshallow) {
1162                 if (depth)
1163                         die(_("--depth and --unshallow cannot be used together"));
1164                 else if (!is_repository_shallow())
1165                         die(_("--unshallow on a complete repository does not make sense"));
1166                 else
1167                         depth = xstrfmt("%d", INFINITE_DEPTH);
1168         }
1169
1170         /* no need to be strict, transport_set_option() will validate it again */
1171         if (depth && atoi(depth) < 1)
1172                 die(_("depth %s is not a positive number"), depth);
1173
1174         if (recurse_submodules != RECURSE_SUBMODULES_OFF) {
1175                 if (recurse_submodules_default) {
1176                         int arg = parse_fetch_recurse_submodules_arg("--recurse-submodules-default", recurse_submodules_default);
1177                         set_config_fetch_recurse_submodules(arg);
1178                 }
1179                 gitmodules_config();
1180                 git_config(submodule_config, NULL);
1181         }
1182
1183         if (all) {
1184                 if (argc == 1)
1185                         die(_("fetch --all does not take a repository argument"));
1186                 else if (argc > 1)
1187                         die(_("fetch --all does not make sense with refspecs"));
1188                 (void) for_each_remote(get_one_remote_for_fetch, &list);
1189                 result = fetch_multiple(&list);
1190         } else if (argc == 0) {
1191                 /* No arguments -- use default remote */
1192                 remote = remote_get(NULL);
1193                 result = fetch_one(remote, argc, argv);
1194         } else if (multiple) {
1195                 /* All arguments are assumed to be remotes or groups */
1196                 for (i = 0; i < argc; i++)
1197                         if (!add_remote_or_group(argv[i], &list))
1198                                 die(_("No such remote or remote group: %s"), argv[i]);
1199                 result = fetch_multiple(&list);
1200         } else {
1201                 /* Single remote or group */
1202                 (void) add_remote_or_group(argv[0], &list);
1203                 if (list.nr > 1) {
1204                         /* More than one remote */
1205                         if (argc > 1)
1206                                 die(_("Fetching a group and specifying refspecs does not make sense"));
1207                         result = fetch_multiple(&list);
1208                 } else {
1209                         /* Zero or one remotes */
1210                         remote = remote_get(argv[0]);
1211                         result = fetch_one(remote, argc-1, argv+1);
1212                 }
1213         }
1214
1215         if (!result && (recurse_submodules != RECURSE_SUBMODULES_OFF)) {
1216                 struct argv_array options = ARGV_ARRAY_INIT;
1217
1218                 add_options_to_argv(&options);
1219                 result = fetch_populated_submodules(&options,
1220                                                     submodule_prefix,
1221                                                     recurse_submodules,
1222                                                     verbosity < 0);
1223                 argv_array_clear(&options);
1224         }
1225
1226         /* All names were strdup()ed or strndup()ed */
1227         list.strdup_strings = 1;
1228         string_list_clear(&list, 0);
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 }