builtin/fetch.c

   1 /*
   2  * "git fetch"
   3  */
   4 #include "cache.h"
   5 #include "refs.h"
   6 #include "commit.h"
   7 #include "builtin.h"
   8 #include "string-list.h"
   9 #include "remote.h"
  10 #include "transport.h"
  11 #include "run-command.h"
  12 #include "parse-options.h"
  13 #include "sigchain.h"
  14 #include "transport.h"
  15 #include "submodule.h"
  16 #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 const char *depth;
  41 static const char *upload_pack;
  42 static struct strbuf default_rla = STRBUF_INIT;
  43 static struct transport *gtransport;
  44 static struct transport *gsecondary;
  45 static const char *submodule_prefix = "";
  46 static const char *recurse_submodules_default;
  47 static int shown_url = 0;
  48 static int refmap_alloc, refmap_nr;
  49 static const char **refmap_array;
  50
  51 static int option_parse_recurse_submodules(const struct option *opt,
  52                                    const char *arg, int unset)
  53 {
  54         if (unset) {
  55                 recurse_submodules = RECURSE_SUBMODULES_OFF;
  56         } else {
  57                 if (arg)
  58                         recurse_submodules = parse_fetch_recurse_submodules_arg(opt->long_name, arg);
  59                 else
  60                         recurse_submodules = RECURSE_SUBMODULES_ON;
  61         }
  62         return 0;
  63 }
  64
  65 static int git_fetch_config(const char *k, const char *v, void *cb)
  66 {
  67         if (!strcmp(k, "fetch.prune")) {
  68                 fetch_prune_config = git_config_bool(k, v);
  69                 return 0;
  70         }
  71         return git_default_config(k, v, cb);
  72 }
  73
  74 static int parse_refmap_arg(const struct option *opt, const char *arg, int unset)
  75 {
  76         ALLOC_GROW(refmap_array, refmap_nr + 1, refmap_alloc);
  77
  78         /*
  79          * "git fetch --refmap='' origin foo"
  80          * can be used to tell the command not to store anywhere
  81          */
  82         if (*arg)
  83                 refmap_array[refmap_nr++] = arg;
  84         return 0;
  85 }
  86
  87 static struct option builtin_fetch_options[] = {
  88         OPT__VERBOSITY(&verbosity),
  89         OPT_BOOL(0, "all", &all,
  90                  N_("fetch from all remotes")),
  91         OPT_BOOL('a', "append", &append,
  92                  N_("append to .git/FETCH_HEAD instead of overwriting")),
  93         OPT_STRING(0, "upload-pack", &upload_pack, N_("path"),
  94                    N_("path to upload pack on remote end")),
  95         OPT__FORCE(&force, N_("force overwrite of local branch")),
  96         OPT_BOOL('m', "multiple", &multiple,
  97                  N_("fetch from multiple remotes")),
  98         OPT_SET_INT('t', "tags", &tags,
  99                     N_("fetch all tags and associated objects"), TAGS_SET),
 100         OPT_SET_INT('n', NULL, &tags,
 101                     N_("do not fetch all tags (--no-tags)"), TAGS_UNSET),
 102         OPT_BOOL('p', "prune", &prune,
 103                  N_("prune remote-tracking branches no longer on remote")),
 104         { OPTION_CALLBACK, 0, "recurse-submodules", NULL, N_("on-demand"),
 105                     N_("control recursive fetching of submodules"),
 106                     PARSE_OPT_OPTARG, option_parse_recurse_submodules },
 107         OPT_BOOL(0, "dry-run", &dry_run,
 108                  N_("dry run")),
 109         OPT_BOOL('k', "keep", &keep, N_("keep downloaded pack")),
 110         OPT_BOOL('u', "update-head-ok", &update_head_ok,
 111                     N_("allow updating of HEAD ref")),
 112         OPT_BOOL(0, "progress", &progress, N_("force progress reporting")),
 113         OPT_STRING(0, "depth", &depth, N_("depth"),
 114                    N_("deepen history of shallow clone")),
 115         { OPTION_SET_INT, 0, "unshallow", &unshallow, NULL,
 116                    N_("convert to a complete repository"),
 117                    PARSE_OPT_NONEG | PARSE_OPT_NOARG, NULL, 1 },
 118         { OPTION_STRING, 0, "submodule-prefix", &submodule_prefix, N_("dir"),
 119                    N_("prepend this to submodule path output"), PARSE_OPT_HIDDEN },
 120         { OPTION_STRING, 0, "recurse-submodules-default",
 121                    &recurse_submodules_default, NULL,
 122                    N_("default mode for recursion"), PARSE_OPT_HIDDEN },
 123         OPT_BOOL(0, "update-shallow", &update_shallow,
 124                  N_("accept refs that update .git/shallow")),
 125         { OPTION_CALLBACK, 0, "refmap", NULL, N_("refmap"),
 126           N_("specify fetch refmap"), PARSE_OPT_NONEG, parse_refmap_arg },
 127         OPT_END()
 128 };
 129
 130 static void unlock_pack(void)
 131 {
 132         if (gtransport)
 133                 transport_unlock_pack(gtransport);
 134         if (gsecondary)
 135                 transport_unlock_pack(gsecondary);
 136 }
 137
 138 static void unlock_pack_on_signal(int signo)
 139 {
 140         unlock_pack();
 141         sigchain_pop(signo);
 142         raise(signo);
 143 }
 144
 145 static void add_merge_config(struct ref **head,
 146                            const struct ref *remote_refs,
 147                            struct branch *branch,
 148                            struct ref ***tail)
 149 {
 150         int i;
 151
 152         for (i = 0; i < branch->merge_nr; i++) {
 153                 struct ref *rm, **old_tail = *tail;
 154                 struct refspec refspec;
 155
 156                 for (rm = *head; rm; rm = rm->next) {
 157                         if (branch_merge_matches(branch, i, rm->name)) {
 158                                 rm->fetch_head_status = FETCH_HEAD_MERGE;
 159                                 break;
 160                         }
 161                 }
 162                 if (rm)
 163                         continue;
 164
 165                 /*
 166                  * Not fetched to a remote-tracking branch?  We need to fetch
 167                  * it anyway to allow this branch's "branch.$name.merge"
 168                  * to be honored by 'git pull', but we do not have to
 169                  * fail if branch.$name.merge is misconfigured to point
 170                  * at a nonexisting branch.  If we were indeed called by
 171                  * 'git pull', it will notice the misconfiguration because
 172                  * there is no entry in the resulting FETCH_HEAD marked
 173                  * for merging.
 174                  */
 175                 memset(&refspec, 0, sizeof(refspec));
 176                 refspec.src = branch->merge[i]->src;
 177                 get_fetch_map(remote_refs, &refspec, tail, 1);
 178                 for (rm = *old_tail; rm; rm = rm->next)
 179                         rm->fetch_head_status = FETCH_HEAD_MERGE;
 180         }
 181 }
 182
 183 static int add_existing(const char *refname, const unsigned char *sha1,
 184                         int flag, void *cbdata)
 185 {
 186         struct string_list *list = (struct string_list *)cbdata;
 187         struct string_list_item *item = string_list_insert(list, refname);
 188         item->util = xmalloc(20);
 189         hashcpy(item->util, sha1);
 190         return 0;
 191 }
 192
 193 static int will_fetch(struct ref **head, const unsigned char *sha1)
 194 {
 195         struct ref *rm = *head;
 196         while (rm) {
 197                 if (!hashcmp(rm->old_sha1, sha1))
 198                         return 1;
 199                 rm = rm->next;
 200         }
 201         return 0;
 202 }
 203
 204 static void find_non_local_tags(struct transport *transport,
 205                         struct ref **head,
 206                         struct ref ***tail)
 207 {
 208         struct string_list existing_refs = STRING_LIST_INIT_DUP;
 209         struct string_list remote_refs = STRING_LIST_INIT_NODUP;
 210         const struct ref *ref;
 211         struct string_list_item *item = NULL;
 212
 213         for_each_ref(add_existing, &existing_refs);
 214         for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
 215                 if (!starts_with(ref->name, "refs/tags/"))
 216                         continue;
 217
 218                 /*
 219                  * The peeled ref always follows the matching base
 220                  * ref, so if we see a peeled ref that we don't want
 221                  * to fetch then we can mark the ref entry in the list
 222                  * as one to ignore by setting util to NULL.
 223                  */
 224                 if (ends_with(ref->name, "^{}")) {
 225                         if (item && !has_sha1_file(ref->old_sha1) &&
 226                             !will_fetch(head, ref->old_sha1) &&
 227                             !has_sha1_file(item->util) &&
 228                             !will_fetch(head, item->util))
 229                                 item->util = NULL;
 230                         item = NULL;
 231                         continue;
 232                 }
 233
 234                 /*
 235                  * If item is non-NULL here, then we previously saw a
 236                  * ref not followed by a peeled reference, so we need
 237                  * to check if it is a lightweight tag that we want to
 238                  * fetch.
 239                  */
 240                 if (item && !has_sha1_file(item->util) &&
 241                     !will_fetch(head, item->util))
 242                         item->util = NULL;
 243
 244                 item = NULL;
 245
 246                 /* skip duplicates and refs that we already have */
 247                 if (string_list_has_string(&remote_refs, ref->name) ||
 248                     string_list_has_string(&existing_refs, ref->name))
 249                         continue;
 250
 251                 item = string_list_insert(&remote_refs, ref->name);
 252                 item->util = (void *)ref->old_sha1;
 253         }
 254         string_list_clear(&existing_refs, 1);
 255
 256         /*
 257          * We may have a final lightweight tag that needs to be
 258          * checked to see if it needs fetching.
 259          */
 260         if (item && !has_sha1_file(item->util) &&
 261             !will_fetch(head, item->util))
 262                 item->util = NULL;
 263
 264         /*
 265          * For all the tags in the remote_refs string list,
 266          * add them to the list of refs to be fetched
 267          */
 268         for_each_string_list_item(item, &remote_refs) {
 269                 /* Unless we have already decided to ignore this item... */
 270                 if (item->util)
 271                 {
 272                         struct ref *rm = alloc_ref(item->string);
 273                         rm->peer_ref = alloc_ref(item->string);
 274                         hashcpy(rm->old_sha1, item->util);
 275                         **tail = rm;
 276                         *tail = &rm->next;
 277                 }
 278         }
 279
 280         string_list_clear(&remote_refs, 0);
 281 }
 282
 283 static struct ref *get_ref_map(struct transport *transport,
 284                                struct refspec *refspecs, int refspec_count,
 285                                int tags, int *autotags)
 286 {
 287         int i;
 288         struct ref *rm;
 289         struct ref *ref_map = NULL;
 290         struct ref **tail = &ref_map;
 291
 292         /* opportunistically-updated references: */
 293         struct ref *orefs = NULL, **oref_tail = &orefs;
 294
 295         const struct ref *remote_refs = transport_get_remote_refs(transport);
 296
 297         if (refspec_count) {
 298                 struct refspec *fetch_refspec;
 299                 int fetch_refspec_nr;
 300
 301                 for (i = 0; i < refspec_count; i++) {
 302                         get_fetch_map(remote_refs, &refspecs[i], &tail, 0);
 303                         if (refspecs[i].dst && refspecs[i].dst[0])
 304                                 *autotags = 1;
 305                 }
 306                 /* Merge everything on the command line (but not --tags) */
 307                 for (rm = ref_map; rm; rm = rm->next)
 308                         rm->fetch_head_status = FETCH_HEAD_MERGE;
 309
 310                 /*
 311                  * For any refs that we happen to be fetching via
 312                  * command-line arguments, the destination ref might
 313                  * have been missing or have been different than the
 314                  * remote-tracking ref that would be derived from the
 315                  * configured refspec.  In these cases, we want to
 316                  * take the opportunity to update their configured
 317                  * remote-tracking reference.  However, we do not want
 318                  * to mention these entries in FETCH_HEAD at all, as
 319                  * they would simply be duplicates of existing
 320                  * entries, so we set them FETCH_HEAD_IGNORE below.
 321                  *
 322                  * We compute these entries now, based only on the
 323                  * refspecs specified on the command line.  But we add
 324                  * them to the list following the refspecs resulting
 325                  * from the tags option so that one of the latter,
 326                  * which has FETCH_HEAD_NOT_FOR_MERGE, is not removed
 327                  * by ref_remove_duplicates() in favor of one of these
 328                  * opportunistic entries with FETCH_HEAD_IGNORE.
 329                  */
 330                 if (refmap_array) {
 331                         fetch_refspec = parse_fetch_refspec(refmap_nr, refmap_array);
 332                         fetch_refspec_nr = refmap_nr;
 333                 } else {
 334                         fetch_refspec = transport->remote->fetch;
 335                         fetch_refspec_nr = transport->remote->fetch_refspec_nr;
 336                 }
 337
 338                 for (i = 0; i < fetch_refspec_nr; i++)
 339                         get_fetch_map(ref_map, &fetch_refspec[i], &oref_tail, 1);
 340
 341                 if (tags == TAGS_SET)
 342                         get_fetch_map(remote_refs, tag_refspec, &tail, 0);
 343         } else if (refmap_array) {
 344                 die("--refmap option is only meaningful with command-line refspec(s).");
 345         } else {
 346                 /* Use the defaults */
 347                 struct remote *remote = transport->remote;
 348                 struct branch *branch = branch_get(NULL);
 349                 int has_merge = branch_has_merge_config(branch);
 350                 if (remote &&
 351                     (remote->fetch_refspec_nr ||
 352                      /* Note: has_merge implies non-NULL branch->remote_name */
 353                      (has_merge && !strcmp(branch->remote_name, remote->name)))) {
 354                         for (i = 0; i < remote->fetch_refspec_nr; i++) {
 355                                 get_fetch_map(remote_refs, &remote->fetch[i], &tail, 0);
 356                                 if (remote->fetch[i].dst &&
 357                                     remote->fetch[i].dst[0])
 358                                         *autotags = 1;
 359                                 if (!i && !has_merge && ref_map &&
 360                                     !remote->fetch[0].pattern)
 361                                         ref_map->fetch_head_status = FETCH_HEAD_MERGE;
 362                         }
 363                         /*
 364                          * if the remote we're fetching from is the same
 365                          * as given in branch.<name>.remote, we add the
 366                          * ref given in branch.<name>.merge, too.
 367                          *
 368                          * Note: has_merge implies non-NULL branch->remote_name
 369                          */
 370                         if (has_merge &&
 371                             !strcmp(branch->remote_name, remote->name))
 372                                 add_merge_config(&ref_map, remote_refs, branch, &tail);
 373                 } else {
 374                         ref_map = get_remote_ref(remote_refs, "HEAD");
 375                         if (!ref_map)
 376                                 die(_("Couldn't find remote ref HEAD"));
 377                         ref_map->fetch_head_status = FETCH_HEAD_MERGE;
 378                         tail = &ref_map->next;
 379                 }
 380         }
 381
 382         if (tags == TAGS_SET)
 383                 /* also fetch all tags */
 384                 get_fetch_map(remote_refs, tag_refspec, &tail, 0);
 385         else if (tags == TAGS_DEFAULT && *autotags)
 386                 find_non_local_tags(transport, &ref_map, &tail);
 387
 388         /* Now append any refs to be updated opportunistically: */
 389         *tail = orefs;
 390         for (rm = orefs; rm; rm = rm->next) {
 391                 rm->fetch_head_status = FETCH_HEAD_IGNORE;
 392                 tail = &rm->next;
 393         }
 394
 395         return ref_remove_duplicates(ref_map);
 396 }
 397
 398 #define STORE_REF_ERROR_OTHER 1
 399 #define STORE_REF_ERROR_DF_CONFLICT 2
 400
 401 static int s_update_ref(const char *action,
 402                         struct ref *ref,
 403                         int check_old)
 404 {
 405         char msg[1024];
 406         char *rla = getenv("GIT_REFLOG_ACTION");
 407         struct ref_transaction *transaction;
 408         struct strbuf err = STRBUF_INIT;
 409         int ret, df_conflict = 0;
 410
 411         if (dry_run)
 412                 return 0;
 413         if (!rla)
 414                 rla = default_rla.buf;
 415         snprintf(msg, sizeof(msg), "%s: %s", rla, action);
 416
 417         transaction = ref_transaction_begin(&err);
 418         if (!transaction ||
 419             ref_transaction_update(transaction, ref->name, ref->new_sha1,
 420                                    ref->old_sha1, 0, check_old, msg, &err))
 421                 goto fail;
 422
 423         ret = ref_transaction_commit(transaction, &err);
 424         if (ret) {
 425                 df_conflict = (ret == TRANSACTION_NAME_CONFLICT);
 426                 goto fail;
 427         }
 428
 429         ref_transaction_free(transaction);
 430         strbuf_release(&err);
 431         return 0;
 432 fail:
 433         ref_transaction_free(transaction);
 434         error("%s", err.buf);
 435         strbuf_release(&err);
 436         return df_conflict ? STORE_REF_ERROR_DF_CONFLICT
 437                            : STORE_REF_ERROR_OTHER;
 438 }
 439
 440 #define REFCOL_WIDTH  10
 441
 442 static int update_local_ref(struct ref *ref,
 443                             const char *remote,
 444                             const struct ref *remote_ref,
 445                             struct strbuf *display)
 446 {
 447         struct commit *current = NULL, *updated;
 448         enum object_type type;
 449         struct branch *current_branch = branch_get(NULL);
 450         const char *pretty_ref = prettify_refname(ref->name);
 451
 452         type = sha1_object_info(ref->new_sha1, NULL);
 453         if (type < 0)
 454                 die(_("object %s not found"), sha1_to_hex(ref->new_sha1));
 455
 456         if (!hashcmp(ref->old_sha1, ref->new_sha1)) {
 457                 if (verbosity > 0)
 458                         strbuf_addf(display, "= %-*s %-*s -> %s",
 459                                     TRANSPORT_SUMMARY(_("[up to date]")),
 460                                     REFCOL_WIDTH, remote, pretty_ref);
 461                 return 0;
 462         }
 463
 464         if (current_branch &&
 465             !strcmp(ref->name, current_branch->name) &&
 466             !(update_head_ok || is_bare_repository()) &&
 467             !is_null_sha1(ref->old_sha1)) {
 468                 /*
 469                  * If this is the head, and it's not okay to update
 470                  * the head, and the old value of the head isn't empty...
 471                  */
 472                 strbuf_addf(display,
 473                             _("! %-*s %-*s -> %s  (can't fetch in current branch)"),
 474                             TRANSPORT_SUMMARY(_("[rejected]")),
 475                             REFCOL_WIDTH, remote, pretty_ref);
 476                 return 1;
 477         }
 478
 479         if (!is_null_sha1(ref->old_sha1) &&
 480             starts_with(ref->name, "refs/tags/")) {
 481                 int r;
 482                 r = s_update_ref("updating tag", ref, 0);
 483                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 484                             r ? '!' : '-',
 485                             TRANSPORT_SUMMARY(_("[tag update]")),
 486                             REFCOL_WIDTH, remote, pretty_ref,
 487                             r ? _("  (unable to update local ref)") : "");
 488                 return r;
 489         }
 490
 491         current = lookup_commit_reference_gently(ref->old_sha1, 1);
 492         updated = lookup_commit_reference_gently(ref->new_sha1, 1);
 493         if (!current || !updated) {
 494                 const char *msg;
 495                 const char *what;
 496                 int r;
 497                 /*
 498                  * Nicely describe the new ref we're fetching.
 499                  * Base this on the remote's ref name, as it's
 500                  * more likely to follow a standard layout.
 501                  */
 502                 const char *name = remote_ref ? remote_ref->name : "";
 503                 if (starts_with(name, "refs/tags/")) {
 504                         msg = "storing tag";
 505                         what = _("[new tag]");
 506                 } else if (starts_with(name, "refs/heads/")) {
 507                         msg = "storing head";
 508                         what = _("[new branch]");
 509                 } else {
 510                         msg = "storing ref";
 511                         what = _("[new ref]");
 512                 }
 513
 514                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 515                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 516                         check_for_new_submodule_commits(ref->new_sha1);
 517                 r = s_update_ref(msg, ref, 0);
 518                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 519                             r ? '!' : '*',
 520                             TRANSPORT_SUMMARY(what),
 521                             REFCOL_WIDTH, remote, pretty_ref,
 522                             r ? _("  (unable to update local ref)") : "");
 523                 return r;
 524         }
 525
 526         if (in_merge_bases(current, updated)) {
 527                 char quickref[83];
 528                 int r;
 529                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 530                 strcat(quickref, "..");
 531                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 532                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 533                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 534                         check_for_new_submodule_commits(ref->new_sha1);
 535                 r = s_update_ref("fast-forward", ref, 1);
 536                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 537                             r ? '!' : ' ',
 538                             TRANSPORT_SUMMARY_WIDTH, quickref,
 539                             REFCOL_WIDTH, remote, pretty_ref,
 540                             r ? _("  (unable to update local ref)") : "");
 541                 return r;
 542         } else if (force || ref->force) {
 543                 char quickref[84];
 544                 int r;
 545                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 546                 strcat(quickref, "...");
 547                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 548                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 549                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 550                         check_for_new_submodule_commits(ref->new_sha1);
 551                 r = s_update_ref("forced-update", ref, 1);
 552                 strbuf_addf(display, "%c %-*s %-*s -> %s  (%s)",
 553                             r ? '!' : '+',
 554                             TRANSPORT_SUMMARY_WIDTH, quickref,
 555                             REFCOL_WIDTH, remote, pretty_ref,
 556                             r ? _("unable to update local ref") : _("forced update"));
 557                 return r;
 558         } else {
 559                 strbuf_addf(display, "! %-*s %-*s -> %s  %s",
 560                             TRANSPORT_SUMMARY(_("[rejected]")),
 561                             REFCOL_WIDTH, remote, pretty_ref,
 562                             _("(non-fast-forward)"));
 563                 return 1;
 564         }
 565 }
 566
 567 static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
 568 {
 569         struct ref **rm = cb_data;
 570         struct ref *ref = *rm;
 571
 572         while (ref && ref->status == REF_STATUS_REJECT_SHALLOW)
 573                 ref = ref->next;
 574         if (!ref)
 575                 return -1; /* end of the list */
 576         *rm = ref->next;
 577         hashcpy(sha1, ref->old_sha1);
 578         return 0;
 579 }
 580
 581 static int store_updated_refs(const char *raw_url, const char *remote_name,
 582                 struct ref *ref_map)
 583 {
 584         FILE *fp;
 585         struct commit *commit;
 586         int url_len, i, rc = 0;
 587         struct strbuf note = STRBUF_INIT;
 588         const char *what, *kind;
 589         struct ref *rm;
 590         char *url, *filename = dry_run ? "/dev/null" : git_path("FETCH_HEAD");
 591         int want_status;
 592
 593         fp = fopen(filename, "a");
 594         if (!fp)
 595                 return error(_("cannot open %s: %s\n"), filename, strerror(errno));
 596
 597         if (raw_url)
 598                 url = transport_anonymize_url(raw_url);
 599         else
 600                 url = xstrdup("foreign");
 601
 602         rm = ref_map;
 603         if (check_everything_connected(iterate_ref_map, 0, &rm)) {
 604                 rc = error(_("%s did not send all necessary objects\n"), url);
 605                 goto abort;
 606         }
 607
 608         /*
 609          * We do a pass for each fetch_head_status type in their enum order, so
 610          * merged entries are written before not-for-merge. That lets readers
 611          * use FETCH_HEAD as a refname to refer to the ref to be merged.
 612          */
 613         for (want_status = FETCH_HEAD_MERGE;
 614              want_status <= FETCH_HEAD_IGNORE;
 615              want_status++) {
 616                 for (rm = ref_map; rm; rm = rm->next) {
 617                         struct ref *ref = NULL;
 618                         const char *merge_status_marker = "";
 619
 620                         if (rm->status == REF_STATUS_REJECT_SHALLOW) {
 621                                 if (want_status == FETCH_HEAD_MERGE)
 622                                         warning(_("reject %s because shallow roots are not allowed to be updated"),
 623                                                 rm->peer_ref ? rm->peer_ref->name : rm->name);
 624                                 continue;
 625                         }
 626
 627                         commit = lookup_commit_reference_gently(rm->old_sha1, 1);
 628                         if (!commit)
 629                                 rm->fetch_head_status = FETCH_HEAD_NOT_FOR_MERGE;
 630
 631                         if (rm->fetch_head_status != want_status)
 632                                 continue;
 633
 634                         if (rm->peer_ref) {
 635                                 ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
 636                                 strcpy(ref->name, rm->peer_ref->name);
 637                                 hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
 638                                 hashcpy(ref->new_sha1, rm->old_sha1);
 639                                 ref->force = rm->peer_ref->force;
 640                         }
 641
 642
 643                         if (!strcmp(rm->name, "HEAD")) {
 644                                 kind = "";
 645                                 what = "";
 646                         }
 647                         else if (starts_with(rm->name, "refs/heads/")) {
 648                                 kind = "branch";
 649                                 what = rm->name + 11;
 650                         }
 651                         else if (starts_with(rm->name, "refs/tags/")) {
 652                                 kind = "tag";
 653                                 what = rm->name + 10;
 654                         }
 655                         else if (starts_with(rm->name, "refs/remotes/")) {
 656                                 kind = "remote-tracking branch";
 657                                 what = rm->name + 13;
 658                         }
 659                         else {
 660                                 kind = "";
 661                                 what = rm->name;
 662                         }
 663
 664                         url_len = strlen(url);
 665                         for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 666                                 ;
 667                         url_len = i + 1;
 668                         if (4 < i && !strncmp(".git", url + i - 3, 4))
 669                                 url_len = i - 3;
 670
 671                         strbuf_reset(&note);
 672                         if (*what) {
 673                                 if (*kind)
 674                                         strbuf_addf(&note, "%s ", kind);
 675                                 strbuf_addf(&note, "'%s' of ", what);
 676                         }
 677                         switch (rm->fetch_head_status) {
 678                         case FETCH_HEAD_NOT_FOR_MERGE:
 679                                 merge_status_marker = "not-for-merge";
 680                                 /* fall-through */
 681                         case FETCH_HEAD_MERGE:
 682                                 fprintf(fp, "%s\t%s\t%s",
 683                                         sha1_to_hex(rm->old_sha1),
 684                                         merge_status_marker,
 685                                         note.buf);
 686                                 for (i = 0; i < url_len; ++i)
 687                                         if ('\n' == url[i])
 688                                                 fputs("\\n", fp);
 689                                         else
 690                                                 fputc(url[i], fp);
 691                                 fputc('\n', fp);
 692                                 break;
 693                         default:
 694                                 /* do not write anything to FETCH_HEAD */
 695                                 break;
 696                         }
 697
 698                         strbuf_reset(&note);
 699                         if (ref) {
 700                                 rc |= update_local_ref(ref, what, rm, &note);
 701                                 free(ref);
 702                         } else
 703                                 strbuf_addf(&note, "* %-*s %-*s -> FETCH_HEAD",
 704                                             TRANSPORT_SUMMARY_WIDTH,
 705                                             *kind ? kind : "branch",
 706                                             REFCOL_WIDTH,
 707                                             *what ? what : "HEAD");
 708                         if (note.len) {
 709                                 if (verbosity >= 0 && !shown_url) {
 710                                         fprintf(stderr, _("From %.*s\n"),
 711                                                         url_len, url);
 712                                         shown_url = 1;
 713                                 }
 714                                 if (verbosity >= 0)
 715                                         fprintf(stderr, " %s\n", note.buf);
 716                         }
 717                 }
 718         }
 719
 720         if (rc & STORE_REF_ERROR_DF_CONFLICT)
 721                 error(_("some local refs could not be updated; try running\n"
 722                       " 'git remote prune %s' to remove any old, conflicting "
 723                       "branches"), remote_name);
 724
 725  abort:
 726         strbuf_release(&note);
 727         free(url);
 728         fclose(fp);
 729         return rc;
 730 }
 731
 732 /*
 733  * We would want to bypass the object transfer altogether if
 734  * everything we are going to fetch already exists and is connected
 735  * locally.
 736  */
 737 static int quickfetch(struct ref *ref_map)
 738 {
 739         struct ref *rm = ref_map;
 740
 741         /*
 742          * If we are deepening a shallow clone we already have these
 743          * objects reachable.  Running rev-list here will return with
 744          * a good (0) exit status and we'll bypass the fetch that we
 745          * really need to perform.  Claiming failure now will ensure
 746          * we perform the network exchange to deepen our history.
 747          */
 748         if (depth)
 749                 return -1;
 750         return check_everything_connected(iterate_ref_map, 1, &rm);
 751 }
 752
 753 static int fetch_refs(struct transport *transport, struct ref *ref_map)
 754 {
 755         int ret = quickfetch(ref_map);
 756         if (ret)
 757                 ret = transport_fetch_refs(transport, ref_map);
 758         if (!ret)
 759                 ret |= store_updated_refs(transport->url,
 760                                 transport->remote->name,
 761                                 ref_map);
 762         transport_unlock_pack(transport);
 763         return ret;
 764 }
 765
 766 static int prune_refs(struct refspec *refs, int ref_count, struct ref *ref_map,
 767                 const char *raw_url)
 768 {
 769         int url_len, i, result = 0;
 770         struct ref *ref, *stale_refs = get_stale_heads(refs, ref_count, ref_map);
 771         char *url;
 772         const char *dangling_msg = dry_run
 773                 ? _("   (%s will become dangling)")
 774                 : _("   (%s has become dangling)");
 775
 776         if (raw_url)
 777                 url = transport_anonymize_url(raw_url);
 778         else
 779                 url = xstrdup("foreign");
 780
 781         url_len = strlen(url);
 782         for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 783                 ;
 784
 785         url_len = i + 1;
 786         if (4 < i && !strncmp(".git", url + i - 3, 4))
 787                 url_len = i - 3;
 788
 789         for (ref = stale_refs; ref; ref = ref->next) {
 790                 if (!dry_run)
 791                         result |= delete_ref(ref->name, NULL, 0);
 792                 if (verbosity >= 0 && !shown_url) {
 793                         fprintf(stderr, _("From %.*s\n"), url_len, url);
 794                         shown_url = 1;
 795                 }
 796                 if (verbosity >= 0) {
 797                         fprintf(stderr, " x %-*s %-*s -> %s\n",
 798                                 TRANSPORT_SUMMARY(_("[deleted]")),
 799                                 REFCOL_WIDTH, _("(none)"), prettify_refname(ref->name));
 800                         warn_dangling_symref(stderr, dangling_msg, ref->name);
 801                 }
 802         }
 803         free(url);
 804         free_refs(stale_refs);
 805         return result;
 806 }
 807
 808 static void check_not_current_branch(struct ref *ref_map)
 809 {
 810         struct branch *current_branch = branch_get(NULL);
 811
 812         if (is_bare_repository() || !current_branch)
 813                 return;
 814
 815         for (; ref_map; ref_map = ref_map->next)
 816                 if (ref_map->peer_ref && !strcmp(current_branch->refname,
 817                                         ref_map->peer_ref->name))
 818                         die(_("Refusing to fetch into current branch %s "
 819                             "of non-bare repository"), current_branch->refname);
 820 }
 821
 822 static int truncate_fetch_head(void)
 823 {
 824         char *filename = git_path("FETCH_HEAD");
 825         FILE *fp = fopen(filename, "w");
 826
 827         if (!fp)
 828                 return error(_("cannot open %s: %s\n"), filename, strerror(errno));
 829         fclose(fp);
 830         return 0;
 831 }
 832
 833 static void set_option(struct transport *transport, const char *name, const char *value)
 834 {
 835         int r = transport_set_option(transport, name, value);
 836         if (r < 0)
 837                 die(_("Option \"%s\" value \"%s\" is not valid for %s"),
 838                     name, value, transport->url);
 839         if (r > 0)
 840                 warning(_("Option \"%s\" is ignored for %s\n"),
 841                         name, transport->url);
 842 }
 843
 844 static struct transport *prepare_transport(struct remote *remote)
 845 {
 846         struct transport *transport;
 847         transport = transport_get(remote, NULL);
 848         transport_set_verbosity(transport, verbosity, progress);
 849         if (upload_pack)
 850                 set_option(transport, TRANS_OPT_UPLOADPACK, upload_pack);
 851         if (keep)
 852                 set_option(transport, TRANS_OPT_KEEP, "yes");
 853         if (depth)
 854                 set_option(transport, TRANS_OPT_DEPTH, depth);
 855         if (update_shallow)
 856                 set_option(transport, TRANS_OPT_UPDATE_SHALLOW, "yes");
 857         return transport;
 858 }
 859
 860 static void backfill_tags(struct transport *transport, struct ref *ref_map)
 861 {
 862         if (transport->cannot_reuse) {
 863                 gsecondary = prepare_transport(transport->remote);
 864                 transport = gsecondary;
 865         }
 866
 867         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
 868         transport_set_option(transport, TRANS_OPT_DEPTH, "0");
 869         fetch_refs(transport, ref_map);
 870
 871         if (gsecondary) {
 872                 transport_disconnect(gsecondary);
 873                 gsecondary = NULL;
 874         }
 875 }
 876
 877 static int do_fetch(struct transport *transport,
 878                     struct refspec *refs, int ref_count)
 879 {
 880         struct string_list existing_refs = STRING_LIST_INIT_DUP;
 881         struct ref *ref_map;
 882         struct ref *rm;
 883         int autotags = (transport->remote->fetch_tags == 1);
 884         int retcode = 0;
 885
 886         for_each_ref(add_existing, &existing_refs);
 887
 888         if (tags == TAGS_DEFAULT) {
 889                 if (transport->remote->fetch_tags == 2)
 890                         tags = TAGS_SET;
 891                 if (transport->remote->fetch_tags == -1)
 892                         tags = TAGS_UNSET;
 893         }
 894
 895         if (!transport->get_refs_list || !transport->fetch)
 896                 die(_("Don't know how to fetch from %s"), transport->url);
 897
 898         /* if not appending, truncate FETCH_HEAD */
 899         if (!append && !dry_run) {
 900                 retcode = truncate_fetch_head();
 901                 if (retcode)
 902                         goto cleanup;
 903         }
 904
 905         ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
 906         if (!update_head_ok)
 907                 check_not_current_branch(ref_map);
 908
 909         for (rm = ref_map; rm; rm = rm->next) {
 910                 if (rm->peer_ref) {
 911                         struct string_list_item *peer_item =
 912                                 string_list_lookup(&existing_refs,
 913                                                    rm->peer_ref->name);
 914                         if (peer_item)
 915                                 hashcpy(rm->peer_ref->old_sha1,
 916                                         peer_item->util);
 917                 }
 918         }
 919
 920         if (tags == TAGS_DEFAULT && autotags)
 921                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
 922         if (prune) {
 923                 /*
 924                  * We only prune based on refspecs specified
 925                  * explicitly (via command line or configuration); we
 926                  * don't care whether --tags was specified.
 927                  */
 928                 if (ref_count) {
 929                         prune_refs(refs, ref_count, ref_map, transport->url);
 930                 } else {
 931                         prune_refs(transport->remote->fetch,
 932                                    transport->remote->fetch_refspec_nr,
 933                                    ref_map,
 934                                    transport->url);
 935                 }
 936         }
 937         if (fetch_refs(transport, ref_map)) {
 938                 free_refs(ref_map);
 939                 retcode = 1;
 940                 goto cleanup;
 941         }
 942         free_refs(ref_map);
 943
 944         /* if neither --no-tags nor --tags was specified, do automated tag
 945          * following ... */
 946         if (tags == TAGS_DEFAULT && autotags) {
 947                 struct ref **tail = &ref_map;
 948                 ref_map = NULL;
 949                 find_non_local_tags(transport, &ref_map, &tail);
 950                 if (ref_map)
 951                         backfill_tags(transport, ref_map);
 952                 free_refs(ref_map);
 953         }
 954
 955  cleanup:
 956         string_list_clear(&existing_refs, 1);
 957         return retcode;
 958 }
 959
 960 static int get_one_remote_for_fetch(struct remote *remote, void *priv)
 961 {
 962         struct string_list *list = priv;
 963         if (!remote->skip_default_update)
 964                 string_list_append(list, remote->name);
 965         return 0;
 966 }
 967
 968 struct remote_group_data {
 969         const char *name;
 970         struct string_list *list;
 971 };
 972
 973 static int get_remote_group(const char *key, const char *value, void *priv)
 974 {
 975         struct remote_group_data *g = priv;
 976
 977         if (starts_with(key, "remotes.") &&
 978                         !strcmp(key + 8, g->name)) {
 979                 /* split list by white space */
 980                 int space = strcspn(value, " \t\n");
 981                 while (*value) {
 982                         if (space > 1) {
 983                                 string_list_append(g->list,
 984                                                    xstrndup(value, space));
 985                         }
 986                         value += space + (value[space] != '\0');
 987                         space = strcspn(value, " \t\n");
 988                 }
 989         }
 990
 991         return 0;
 992 }
 993
 994 static int add_remote_or_group(const char *name, struct string_list *list)
 995 {
 996         int prev_nr = list->nr;
 997         struct remote_group_data g;
 998         g.name = name; g.list = list;
 999
1000         git_config(get_remote_group, &g);
1001         if (list->nr == prev_nr) {
1002                 struct remote *remote;
1003                 if (!remote_is_configured(name))
1004                         return 0;
1005                 remote = remote_get(name);
1006                 string_list_append(list, remote->name);
1007         }
1008         return 1;
1009 }
1010
1011 static void add_options_to_argv(struct argv_array *argv)
1012 {
1013         if (dry_run)
1014                 argv_array_push(argv, "--dry-run");
1015         if (prune != -1)
1016                 argv_array_push(argv, prune ? "--prune" : "--no-prune");
1017         if (update_head_ok)
1018                 argv_array_push(argv, "--update-head-ok");
1019         if (force)
1020                 argv_array_push(argv, "--force");
1021         if (keep)
1022                 argv_array_push(argv, "--keep");
1023         if (recurse_submodules == RECURSE_SUBMODULES_ON)
1024                 argv_array_push(argv, "--recurse-submodules");
1025         else if (recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND)
1026                 argv_array_push(argv, "--recurse-submodules=on-demand");
1027         if (tags == TAGS_SET)
1028                 argv_array_push(argv, "--tags");
1029         else if (tags == TAGS_UNSET)
1030                 argv_array_push(argv, "--no-tags");
1031         if (verbosity >= 2)
1032                 argv_array_push(argv, "-v");
1033         if (verbosity >= 1)
1034                 argv_array_push(argv, "-v");
1035         else if (verbosity < 0)
1036                 argv_array_push(argv, "-q");
1037
1038 }
1039
1040 static int fetch_multiple(struct string_list *list)
1041 {
1042         int i, result = 0;
1043         struct argv_array argv = ARGV_ARRAY_INIT;
1044
1045         if (!append && !dry_run) {
1046                 int errcode = truncate_fetch_head();
1047                 if (errcode)
1048                         return errcode;
1049         }
1050
1051         argv_array_pushl(&argv, "fetch", "--append", NULL);
1052         add_options_to_argv(&argv);
1053
1054         for (i = 0; i < list->nr; i++) {
1055                 const char *name = list->items[i].string;
1056                 argv_array_push(&argv, name);
1057                 if (verbosity >= 0)
1058                         printf(_("Fetching %s\n"), name);
1059                 if (run_command_v_opt(argv.argv, RUN_GIT_CMD)) {
1060                         error(_("Could not fetch %s"), name);
1061                         result = 1;
1062                 }
1063                 argv_array_pop(&argv);
1064         }
1065
1066         argv_array_clear(&argv);
1067         return result;
1068 }
1069
1070 static int fetch_one(struct remote *remote, int argc, const char **argv)
1071 {
1072         static const char **refs = NULL;
1073         struct refspec *refspec;
1074         int ref_nr = 0;
1075         int exit_code;
1076
1077         if (!remote)
1078                 die(_("No remote repository specified.  Please, specify either a URL or a\n"
1079                     "remote name from which new revisions should be fetched."));
1080
1081         gtransport = prepare_transport(remote);
1082
1083         if (prune < 0) {
1084                 /* no command line request */
1085                 if (0 <= gtransport->remote->prune)
1086                         prune = gtransport->remote->prune;
1087                 else if (0 <= fetch_prune_config)
1088                         prune = fetch_prune_config;
1089                 else
1090                         prune = PRUNE_BY_DEFAULT;
1091         }
1092
1093         if (argc > 0) {
1094                 int j = 0;
1095                 int i;
1096                 refs = xcalloc(argc + 1, sizeof(const char *));
1097                 for (i = 0; i < argc; i++) {
1098                         if (!strcmp(argv[i], "tag")) {
1099                                 i++;
1100                                 if (i >= argc)
1101                                         die(_("You need to specify a tag name."));
1102                                 refs[j++] = xstrfmt("refs/tags/%s:refs/tags/%s",
1103                                                     argv[i], argv[i]);
1104                         } else
1105                                 refs[j++] = argv[i];
1106                 }
1107                 refs[j] = NULL;
1108                 ref_nr = j;
1109         }
1110
1111         sigchain_push_common(unlock_pack_on_signal);
1112         atexit(unlock_pack);
1113         refspec = parse_fetch_refspec(ref_nr, refs);
1114         exit_code = do_fetch(gtransport, refspec, ref_nr);
1115         free_refspec(ref_nr, refspec);
1116         transport_disconnect(gtransport);
1117         gtransport = NULL;
1118         return exit_code;
1119 }
1120
1121 int cmd_fetch(int argc, const char **argv, const char *prefix)
1122 {
1123         int i;
1124         struct string_list list = STRING_LIST_INIT_NODUP;
1125         struct remote *remote;
1126         int result = 0;
1127         struct argv_array argv_gc_auto = ARGV_ARRAY_INIT;
1128
1129         packet_trace_identity("fetch");
1130
1131         /* Record the command line for the reflog */
1132         strbuf_addstr(&default_rla, "fetch");
1133         for (i = 1; i < argc; i++)
1134                 strbuf_addf(&default_rla, " %s", argv[i]);
1135
1136         git_config(git_fetch_config, NULL);
1137
1138         argc = parse_options(argc, argv, prefix,
1139                              builtin_fetch_options, builtin_fetch_usage, 0);
1140
1141         if (unshallow) {
1142                 if (depth)
1143                         die(_("--depth and --unshallow cannot be used together"));
1144                 else if (!is_repository_shallow())
1145                         die(_("--unshallow on a complete repository does not make sense"));
1146                 else {
1147                         static char inf_depth[12];
1148                         sprintf(inf_depth, "%d", INFINITE_DEPTH);
1149                         depth = inf_depth;
1150                 }
1151         }
1152
1153         /* no need to be strict, transport_set_option() will validate it again */
1154         if (depth && atoi(depth) < 1)
1155                 die(_("depth %s is not a positive number"), depth);
1156
1157         if (recurse_submodules != RECURSE_SUBMODULES_OFF) {
1158                 if (recurse_submodules_default) {
1159                         int arg = parse_fetch_recurse_submodules_arg("--recurse-submodules-default", recurse_submodules_default);
1160                         set_config_fetch_recurse_submodules(arg);
1161                 }
1162                 gitmodules_config();
1163                 git_config(submodule_config, NULL);
1164         }
1165
1166         if (all) {
1167                 if (argc == 1)
1168                         die(_("fetch --all does not take a repository argument"));
1169                 else if (argc > 1)
1170                         die(_("fetch --all does not make sense with refspecs"));
1171                 (void) for_each_remote(get_one_remote_for_fetch, &list);
1172                 result = fetch_multiple(&list);
1173         } else if (argc == 0) {
1174                 /* No arguments -- use default remote */
1175                 remote = remote_get(NULL);
1176                 result = fetch_one(remote, argc, argv);
1177         } else if (multiple) {
1178                 /* All arguments are assumed to be remotes or groups */
1179                 for (i = 0; i < argc; i++)
1180                         if (!add_remote_or_group(argv[i], &list))
1181                                 die(_("No such remote or remote group: %s"), argv[i]);
1182                 result = fetch_multiple(&list);
1183         } else {
1184                 /* Single remote or group */
1185                 (void) add_remote_or_group(argv[0], &list);
1186                 if (list.nr > 1) {
1187                         /* More than one remote */
1188                         if (argc > 1)
1189                                 die(_("Fetching a group and specifying refspecs does not make sense"));
1190                         result = fetch_multiple(&list);
1191                 } else {
1192                         /* Zero or one remotes */
1193                         remote = remote_get(argv[0]);
1194                         result = fetch_one(remote, argc-1, argv+1);
1195                 }
1196         }
1197
1198         if (!result && (recurse_submodules != RECURSE_SUBMODULES_OFF)) {
1199                 struct argv_array options = ARGV_ARRAY_INIT;
1200
1201                 add_options_to_argv(&options);
1202                 result = fetch_populated_submodules(&options,
1203                                                     submodule_prefix,
1204                                                     recurse_submodules,
1205                                                     verbosity < 0);
1206                 argv_array_clear(&options);
1207         }
1208
1209         /* All names were strdup()ed or strndup()ed */
1210         list.strdup_strings = 1;
1211         string_list_clear(&list, 0);
1212
1213         argv_array_pushl(&argv_gc_auto, "gc", "--auto", NULL);
1214         if (verbosity < 0)
1215                 argv_array_push(&argv_gc_auto, "--quiet");
1216         run_command_v_opt(argv_gc_auto.argv, RUN_GIT_CMD);
1217         argv_array_clear(&argv_gc_auto);
1218
1219         return result;
1220 }