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.h"
  15 #include "connected.h"
  16 #include "argv-array.h"
  17
  18 static const char * const builtin_fetch_usage[] = {
  19         N_("git fetch [<options>] [<repository> [<refspec>...]]"),
  20         N_("git fetch [<options>] <group>"),
  21         N_("git fetch --multiple [<options>] [(<repository> | <group>)...]"),
  22         N_("git fetch --all [<options>]"),
  23         NULL
  24 };
  25
  26 enum {
  27         TAGS_UNSET = 0,
  28         TAGS_DEFAULT = 1,
  29         TAGS_SET = 2
  30 };
  31
  32 static int fetch_prune_config = -1; /* unspecified */
  33 static int prune = -1; /* unspecified */
  34 #define PRUNE_BY_DEFAULT 0 /* do we prune by default? */
  35
  36 static int all, append, dry_run, force, keep, multiple, update_head_ok, verbosity;
  37 static int progress = -1, recurse_submodules = RECURSE_SUBMODULES_DEFAULT;
  38 static int tags = TAGS_DEFAULT, unshallow, update_shallow;
  39 static const char *depth;
  40 static const char *upload_pack;
  41 static struct strbuf default_rla = STRBUF_INIT;
  42 static struct transport *gtransport;
  43 static struct transport *gsecondary;
  44 static const char *submodule_prefix = "";
  45 static const char *recurse_submodules_default;
  46 static int shown_url = 0;
  47 static int refmap_alloc, refmap_nr;
  48 static const char **refmap_array;
  49
  50 static int option_parse_recurse_submodules(const struct option *opt,
  51                                    const char *arg, int unset)
  52 {
  53         if (unset) {
  54                 recurse_submodules = RECURSE_SUBMODULES_OFF;
  55         } else {
  56                 if (arg)
  57                         recurse_submodules = parse_fetch_recurse_submodules_arg(opt->long_name, arg);
  58                 else
  59                         recurse_submodules = RECURSE_SUBMODULES_ON;
  60         }
  61         return 0;
  62 }
  63
  64 static int git_fetch_config(const char *k, const char *v, void *cb)
  65 {
  66         if (!strcmp(k, "fetch.prune")) {
  67                 fetch_prune_config = git_config_bool(k, v);
  68                 return 0;
  69         }
  70         return git_default_config(k, v, cb);
  71 }
  72
  73 static int parse_refmap_arg(const struct option *opt, const char *arg, int unset)
  74 {
  75         ALLOC_GROW(refmap_array, refmap_nr + 1, refmap_alloc);
  76
  77         /*
  78          * "git fetch --refmap='' origin foo"
  79          * can be used to tell the command not to store anywhere
  80          */
  81         if (*arg)
  82                 refmap_array[refmap_nr++] = arg;
  83         return 0;
  84 }
  85
  86 static struct option builtin_fetch_options[] = {
  87         OPT__VERBOSITY(&verbosity),
  88         OPT_BOOL(0, "all", &all,
  89                  N_("fetch from all remotes")),
  90         OPT_BOOL('a', "append", &append,
  91                  N_("append to .git/FETCH_HEAD instead of overwriting")),
  92         OPT_STRING(0, "upload-pack", &upload_pack, N_("path"),
  93                    N_("path to upload pack on remote end")),
  94         OPT__FORCE(&force, N_("force overwrite of local branch")),
  95         OPT_BOOL('m', "multiple", &multiple,
  96                  N_("fetch from multiple remotes")),
  97         OPT_SET_INT('t', "tags", &tags,
  98                     N_("fetch all tags and associated objects"), TAGS_SET),
  99         OPT_SET_INT('n', NULL, &tags,
 100                     N_("do not fetch all tags (--no-tags)"), TAGS_UNSET),
 101         OPT_BOOL('p', "prune", &prune,
 102                  N_("prune remote-tracking branches no longer on remote")),
 103         { OPTION_CALLBACK, 0, "recurse-submodules", NULL, N_("on-demand"),
 104                     N_("control recursive fetching of submodules"),
 105                     PARSE_OPT_OPTARG, option_parse_recurse_submodules },
 106         OPT_BOOL(0, "dry-run", &dry_run,
 107                  N_("dry run")),
 108         OPT_BOOL('k', "keep", &keep, N_("keep downloaded pack")),
 109         OPT_BOOL('u', "update-head-ok", &update_head_ok,
 110                     N_("allow updating of HEAD ref")),
 111         OPT_BOOL(0, "progress", &progress, N_("force progress reporting")),
 112         OPT_STRING(0, "depth", &depth, N_("depth"),
 113                    N_("deepen history of shallow clone")),
 114         { OPTION_SET_INT, 0, "unshallow", &unshallow, NULL,
 115                    N_("convert to a complete repository"),
 116                    PARSE_OPT_NONEG | PARSE_OPT_NOARG, NULL, 1 },
 117         { OPTION_STRING, 0, "submodule-prefix", &submodule_prefix, N_("dir"),
 118                    N_("prepend this to submodule path output"), PARSE_OPT_HIDDEN },
 119         { OPTION_STRING, 0, "recurse-submodules-default",
 120                    &recurse_submodules_default, NULL,
 121                    N_("default mode for recursion"), PARSE_OPT_HIDDEN },
 122         OPT_BOOL(0, "update-shallow", &update_shallow,
 123                  N_("accept refs that update .git/shallow")),
 124         { OPTION_CALLBACK, 0, "refmap", NULL, N_("refmap"),
 125           N_("specify fetch refmap"), PARSE_OPT_NONEG, parse_refmap_arg },
 126         OPT_END()
 127 };
 128
 129 static void unlock_pack(void)
 130 {
 131         if (gtransport)
 132                 transport_unlock_pack(gtransport);
 133         if (gsecondary)
 134                 transport_unlock_pack(gsecondary);
 135 }
 136
 137 static void unlock_pack_on_signal(int signo)
 138 {
 139         unlock_pack();
 140         sigchain_pop(signo);
 141         raise(signo);
 142 }
 143
 144 static void add_merge_config(struct ref **head,
 145                            const struct ref *remote_refs,
 146                            struct branch *branch,
 147                            struct ref ***tail)
 148 {
 149         int i;
 150
 151         for (i = 0; i < branch->merge_nr; i++) {
 152                 struct ref *rm, **old_tail = *tail;
 153                 struct refspec refspec;
 154
 155                 for (rm = *head; rm; rm = rm->next) {
 156                         if (branch_merge_matches(branch, i, rm->name)) {
 157                                 rm->fetch_head_status = FETCH_HEAD_MERGE;
 158                                 break;
 159                         }
 160                 }
 161                 if (rm)
 162                         continue;
 163
 164                 /*
 165                  * Not fetched to a remote-tracking branch?  We need to fetch
 166                  * it anyway to allow this branch's "branch.$name.merge"
 167                  * to be honored by 'git pull', but we do not have to
 168                  * fail if branch.$name.merge is misconfigured to point
 169                  * at a nonexisting branch.  If we were indeed called by
 170                  * 'git pull', it will notice the misconfiguration because
 171                  * there is no entry in the resulting FETCH_HEAD marked
 172                  * for merging.
 173                  */
 174                 memset(&refspec, 0, sizeof(refspec));
 175                 refspec.src = branch->merge[i]->src;
 176                 get_fetch_map(remote_refs, &refspec, tail, 1);
 177                 for (rm = *old_tail; rm; rm = rm->next)
 178                         rm->fetch_head_status = FETCH_HEAD_MERGE;
 179         }
 180 }
 181
 182 static int add_existing(const char *refname, const unsigned char *sha1,
 183                         int flag, void *cbdata)
 184 {
 185         struct string_list *list = (struct string_list *)cbdata;
 186         struct string_list_item *item = string_list_insert(list, refname);
 187         item->util = xmalloc(20);
 188         hashcpy(item->util, sha1);
 189         return 0;
 190 }
 191
 192 static int will_fetch(struct ref **head, const unsigned char *sha1)
 193 {
 194         struct ref *rm = *head;
 195         while (rm) {
 196                 if (!hashcmp(rm->old_sha1, sha1))
 197                         return 1;
 198                 rm = rm->next;
 199         }
 200         return 0;
 201 }
 202
 203 static void find_non_local_tags(struct transport *transport,
 204                         struct ref **head,
 205                         struct ref ***tail)
 206 {
 207         struct string_list existing_refs = STRING_LIST_INIT_DUP;
 208         struct string_list remote_refs = STRING_LIST_INIT_NODUP;
 209         const struct ref *ref;
 210         struct string_list_item *item = NULL;
 211
 212         for_each_ref(add_existing, &existing_refs);
 213         for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
 214                 if (!starts_with(ref->name, "refs/tags/"))
 215                         continue;
 216
 217                 /*
 218                  * The peeled ref always follows the matching base
 219                  * ref, so if we see a peeled ref that we don't want
 220                  * to fetch then we can mark the ref entry in the list
 221                  * as one to ignore by setting util to NULL.
 222                  */
 223                 if (ends_with(ref->name, "^{}")) {
 224                         if (item && !has_sha1_file(ref->old_sha1) &&
 225                             !will_fetch(head, ref->old_sha1) &&
 226                             !has_sha1_file(item->util) &&
 227                             !will_fetch(head, item->util))
 228                                 item->util = NULL;
 229                         item = NULL;
 230                         continue;
 231                 }
 232
 233                 /*
 234                  * If item is non-NULL here, then we previously saw a
 235                  * ref not followed by a peeled reference, so we need
 236                  * to check if it is a lightweight tag that we want to
 237                  * fetch.
 238                  */
 239                 if (item && !has_sha1_file(item->util) &&
 240                     !will_fetch(head, item->util))
 241                         item->util = NULL;
 242
 243                 item = NULL;
 244
 245                 /* skip duplicates and refs that we already have */
 246                 if (string_list_has_string(&remote_refs, ref->name) ||
 247                     string_list_has_string(&existing_refs, ref->name))
 248                         continue;
 249
 250                 item = string_list_insert(&remote_refs, ref->name);
 251                 item->util = (void *)ref->old_sha1;
 252         }
 253         string_list_clear(&existing_refs, 1);
 254
 255         /*
 256          * We may have a final lightweight tag that needs to be
 257          * checked to see if it needs fetching.
 258          */
 259         if (item && !has_sha1_file(item->util) &&
 260             !will_fetch(head, item->util))
 261                 item->util = NULL;
 262
 263         /*
 264          * For all the tags in the remote_refs string list,
 265          * add them to the list of refs to be fetched
 266          */
 267         for_each_string_list_item(item, &remote_refs) {
 268                 /* Unless we have already decided to ignore this item... */
 269                 if (item->util)
 270                 {
 271                         struct ref *rm = alloc_ref(item->string);
 272                         rm->peer_ref = alloc_ref(item->string);
 273                         hashcpy(rm->old_sha1, item->util);
 274                         **tail = rm;
 275                         *tail = &rm->next;
 276                 }
 277         }
 278
 279         string_list_clear(&remote_refs, 0);
 280 }
 281
 282 static struct ref *get_ref_map(struct transport *transport,
 283                                struct refspec *refspecs, int refspec_count,
 284                                int tags, int *autotags)
 285 {
 286         int i;
 287         struct ref *rm;
 288         struct ref *ref_map = NULL;
 289         struct ref **tail = &ref_map;
 290
 291         /* opportunistically-updated references: */
 292         struct ref *orefs = NULL, **oref_tail = &orefs;
 293
 294         const struct ref *remote_refs = transport_get_remote_refs(transport);
 295
 296         if (refspec_count) {
 297                 struct refspec *fetch_refspec;
 298                 int fetch_refspec_nr;
 299
 300                 for (i = 0; i < refspec_count; i++) {
 301                         get_fetch_map(remote_refs, &refspecs[i], &tail, 0);
 302                         if (refspecs[i].dst && refspecs[i].dst[0])
 303                                 *autotags = 1;
 304                 }
 305                 /* Merge everything on the command line (but not --tags) */
 306                 for (rm = ref_map; rm; rm = rm->next)
 307                         rm->fetch_head_status = FETCH_HEAD_MERGE;
 308
 309                 /*
 310                  * For any refs that we happen to be fetching via
 311                  * command-line arguments, the destination ref might
 312                  * have been missing or have been different than the
 313                  * remote-tracking ref that would be derived from the
 314                  * configured refspec.  In these cases, we want to
 315                  * take the opportunity to update their configured
 316                  * remote-tracking reference.  However, we do not want
 317                  * to mention these entries in FETCH_HEAD at all, as
 318                  * they would simply be duplicates of existing
 319                  * entries, so we set them FETCH_HEAD_IGNORE below.
 320                  *
 321                  * We compute these entries now, based only on the
 322                  * refspecs specified on the command line.  But we add
 323                  * them to the list following the refspecs resulting
 324                  * from the tags option so that one of the latter,
 325                  * which has FETCH_HEAD_NOT_FOR_MERGE, is not removed
 326                  * by ref_remove_duplicates() in favor of one of these
 327                  * opportunistic entries with FETCH_HEAD_IGNORE.
 328                  */
 329                 if (refmap_array) {
 330                         fetch_refspec = parse_fetch_refspec(refmap_nr, refmap_array);
 331                         fetch_refspec_nr = refmap_nr;
 332                 } else {
 333                         fetch_refspec = transport->remote->fetch;
 334                         fetch_refspec_nr = transport->remote->fetch_refspec_nr;
 335                 }
 336
 337                 for (i = 0; i < fetch_refspec_nr; i++)
 338                         get_fetch_map(ref_map, &fetch_refspec[i], &oref_tail, 1);
 339
 340                 if (tags == TAGS_SET)
 341                         get_fetch_map(remote_refs, tag_refspec, &tail, 0);
 342         } else if (refmap_array) {
 343                 die("--refmap option is only meaningful with command-line refspec(s).");
 344         } else {
 345                 /* Use the defaults */
 346                 struct remote *remote = transport->remote;
 347                 struct branch *branch = branch_get(NULL);
 348                 int has_merge = branch_has_merge_config(branch);
 349                 if (remote &&
 350                     (remote->fetch_refspec_nr ||
 351                      /* Note: has_merge implies non-NULL branch->remote_name */
 352                      (has_merge && !strcmp(branch->remote_name, remote->name)))) {
 353                         for (i = 0; i < remote->fetch_refspec_nr; i++) {
 354                                 get_fetch_map(remote_refs, &remote->fetch[i], &tail, 0);
 355                                 if (remote->fetch[i].dst &&
 356                                     remote->fetch[i].dst[0])
 357                                         *autotags = 1;
 358                                 if (!i && !has_merge && ref_map &&
 359                                     !remote->fetch[0].pattern)
 360                                         ref_map->fetch_head_status = FETCH_HEAD_MERGE;
 361                         }
 362                         /*
 363                          * if the remote we're fetching from is the same
 364                          * as given in branch.<name>.remote, we add the
 365                          * ref given in branch.<name>.merge, too.
 366                          *
 367                          * Note: has_merge implies non-NULL branch->remote_name
 368                          */
 369                         if (has_merge &&
 370                             !strcmp(branch->remote_name, remote->name))
 371                                 add_merge_config(&ref_map, remote_refs, branch, &tail);
 372                 } else {
 373                         ref_map = get_remote_ref(remote_refs, "HEAD");
 374                         if (!ref_map)
 375                                 die(_("Couldn't find remote ref HEAD"));
 376                         ref_map->fetch_head_status = FETCH_HEAD_MERGE;
 377                         tail = &ref_map->next;
 378                 }
 379         }
 380
 381         if (tags == TAGS_SET)
 382                 /* also fetch all tags */
 383                 get_fetch_map(remote_refs, tag_refspec, &tail, 0);
 384         else if (tags == TAGS_DEFAULT && *autotags)
 385                 find_non_local_tags(transport, &ref_map, &tail);
 386
 387         /* Now append any refs to be updated opportunistically: */
 388         *tail = orefs;
 389         for (rm = orefs; rm; rm = rm->next) {
 390                 rm->fetch_head_status = FETCH_HEAD_IGNORE;
 391                 tail = &rm->next;
 392         }
 393
 394         return ref_remove_duplicates(ref_map);
 395 }
 396
 397 #define STORE_REF_ERROR_OTHER 1
 398 #define STORE_REF_ERROR_DF_CONFLICT 2
 399
 400 static int s_update_ref(const char *action,
 401                         struct ref *ref,
 402                         int check_old)
 403 {
 404         char msg[1024];
 405         char *rla = getenv("GIT_REFLOG_ACTION");
 406         struct ref_transaction *transaction;
 407         struct strbuf err = STRBUF_INIT;
 408         int ret, df_conflict = 0;
 409
 410         if (dry_run)
 411                 return 0;
 412         if (!rla)
 413                 rla = default_rla.buf;
 414         snprintf(msg, sizeof(msg), "%s: %s", rla, action);
 415
 416         transaction = ref_transaction_begin(&err);
 417         if (!transaction ||
 418             ref_transaction_update(transaction, ref->name,
 419                                    ref->new_sha1,
 420                                    check_old ? ref->old_sha1 : NULL,
 421                                    0, msg, &err))
 422                 goto fail;
 423
 424         ret = ref_transaction_commit(transaction, &err);
 425         if (ret) {
 426                 df_conflict = (ret == TRANSACTION_NAME_CONFLICT);
 427                 goto fail;
 428         }
 429
 430         ref_transaction_free(transaction);
 431         strbuf_release(&err);
 432         return 0;
 433 fail:
 434         ref_transaction_free(transaction);
 435         error("%s", err.buf);
 436         strbuf_release(&err);
 437         return df_conflict ? STORE_REF_ERROR_DF_CONFLICT
 438                            : STORE_REF_ERROR_OTHER;
 439 }
 440
 441 #define REFCOL_WIDTH  10
 442
 443 static int update_local_ref(struct ref *ref,
 444                             const char *remote,
 445                             const struct ref *remote_ref,
 446                             struct strbuf *display)
 447 {
 448         struct commit *current = NULL, *updated;
 449         enum object_type type;
 450         struct branch *current_branch = branch_get(NULL);
 451         const char *pretty_ref = prettify_refname(ref->name);
 452
 453         type = sha1_object_info(ref->new_sha1, NULL);
 454         if (type < 0)
 455                 die(_("object %s not found"), sha1_to_hex(ref->new_sha1));
 456
 457         if (!hashcmp(ref->old_sha1, ref->new_sha1)) {
 458                 if (verbosity > 0)
 459                         strbuf_addf(display, "= %-*s %-*s -> %s",
 460                                     TRANSPORT_SUMMARY(_("[up to date]")),
 461                                     REFCOL_WIDTH, remote, pretty_ref);
 462                 return 0;
 463         }
 464
 465         if (current_branch &&
 466             !strcmp(ref->name, current_branch->name) &&
 467             !(update_head_ok || is_bare_repository()) &&
 468             !is_null_sha1(ref->old_sha1)) {
 469                 /*
 470                  * If this is the head, and it's not okay to update
 471                  * the head, and the old value of the head isn't empty...
 472                  */
 473                 strbuf_addf(display,
 474                             _("! %-*s %-*s -> %s  (can't fetch in current branch)"),
 475                             TRANSPORT_SUMMARY(_("[rejected]")),
 476                             REFCOL_WIDTH, remote, pretty_ref);
 477                 return 1;
 478         }
 479
 480         if (!is_null_sha1(ref->old_sha1) &&
 481             starts_with(ref->name, "refs/tags/")) {
 482                 int r;
 483                 r = s_update_ref("updating tag", ref, 0);
 484                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 485                             r ? '!' : '-',
 486                             TRANSPORT_SUMMARY(_("[tag update]")),
 487                             REFCOL_WIDTH, remote, pretty_ref,
 488                             r ? _("  (unable to update local ref)") : "");
 489                 return r;
 490         }
 491
 492         current = lookup_commit_reference_gently(ref->old_sha1, 1);
 493         updated = lookup_commit_reference_gently(ref->new_sha1, 1);
 494         if (!current || !updated) {
 495                 const char *msg;
 496                 const char *what;
 497                 int r;
 498                 /*
 499                  * Nicely describe the new ref we're fetching.
 500                  * Base this on the remote's ref name, as it's
 501                  * more likely to follow a standard layout.
 502                  */
 503                 const char *name = remote_ref ? remote_ref->name : "";
 504                 if (starts_with(name, "refs/tags/")) {
 505                         msg = "storing tag";
 506                         what = _("[new tag]");
 507                 } else if (starts_with(name, "refs/heads/")) {
 508                         msg = "storing head";
 509                         what = _("[new branch]");
 510                 } else {
 511                         msg = "storing ref";
 512                         what = _("[new ref]");
 513                 }
 514
 515                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 516                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 517                         check_for_new_submodule_commits(ref->new_sha1);
 518                 r = s_update_ref(msg, ref, 0);
 519                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 520                             r ? '!' : '*',
 521                             TRANSPORT_SUMMARY(what),
 522                             REFCOL_WIDTH, remote, pretty_ref,
 523                             r ? _("  (unable to update local ref)") : "");
 524                 return r;
 525         }
 526
 527         if (in_merge_bases(current, updated)) {
 528                 char quickref[83];
 529                 int r;
 530                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 531                 strcat(quickref, "..");
 532                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 533                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 534                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 535                         check_for_new_submodule_commits(ref->new_sha1);
 536                 r = s_update_ref("fast-forward", ref, 1);
 537                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 538                             r ? '!' : ' ',
 539                             TRANSPORT_SUMMARY_WIDTH, quickref,
 540                             REFCOL_WIDTH, remote, pretty_ref,
 541                             r ? _("  (unable to update local ref)") : "");
 542                 return r;
 543         } else if (force || ref->force) {
 544                 char quickref[84];
 545                 int r;
 546                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 547                 strcat(quickref, "...");
 548                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 549                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 550                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 551                         check_for_new_submodule_commits(ref->new_sha1);
 552                 r = s_update_ref("forced-update", ref, 1);
 553                 strbuf_addf(display, "%c %-*s %-*s -> %s  (%s)",
 554                             r ? '!' : '+',
 555                             TRANSPORT_SUMMARY_WIDTH, quickref,
 556                             REFCOL_WIDTH, remote, pretty_ref,
 557                             r ? _("unable to update local ref") : _("forced update"));
 558                 return r;
 559         } else {
 560                 strbuf_addf(display, "! %-*s %-*s -> %s  %s",
 561                             TRANSPORT_SUMMARY(_("[rejected]")),
 562                             REFCOL_WIDTH, remote, pretty_ref,
 563                             _("(non-fast-forward)"));
 564                 return 1;
 565         }
 566 }
 567
 568 static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
 569 {
 570         struct ref **rm = cb_data;
 571         struct ref *ref = *rm;
 572
 573         while (ref && ref->status == REF_STATUS_REJECT_SHALLOW)
 574                 ref = ref->next;
 575         if (!ref)
 576                 return -1; /* end of the list */
 577         *rm = ref->next;
 578         hashcpy(sha1, ref->old_sha1);
 579         return 0;
 580 }
 581
 582 static int store_updated_refs(const char *raw_url, const char *remote_name,
 583                 struct ref *ref_map)
 584 {
 585         FILE *fp;
 586         struct commit *commit;
 587         int url_len, i, rc = 0;
 588         struct strbuf note = STRBUF_INIT;
 589         const char *what, *kind;
 590         struct ref *rm;
 591         char *url;
 592         const char *filename = dry_run ? "/dev/null" : git_path("FETCH_HEAD");
 593         int want_status;
 594
 595         fp = fopen(filename, "a");
 596         if (!fp)
 597                 return error(_("cannot open %s: %s\n"), filename, strerror(errno));
 598
 599         if (raw_url)
 600                 url = transport_anonymize_url(raw_url);
 601         else
 602                 url = xstrdup("foreign");
 603
 604         rm = ref_map;
 605         if (check_everything_connected(iterate_ref_map, 0, &rm)) {
 606                 rc = error(_("%s did not send all necessary objects\n"), url);
 607                 goto abort;
 608         }
 609
 610         /*
 611          * We do a pass for each fetch_head_status type in their enum order, so
 612          * merged entries are written before not-for-merge. That lets readers
 613          * use FETCH_HEAD as a refname to refer to the ref to be merged.
 614          */
 615         for (want_status = FETCH_HEAD_MERGE;
 616              want_status <= FETCH_HEAD_IGNORE;
 617              want_status++) {
 618                 for (rm = ref_map; rm; rm = rm->next) {
 619                         struct ref *ref = NULL;
 620                         const char *merge_status_marker = "";
 621
 622                         if (rm->status == REF_STATUS_REJECT_SHALLOW) {
 623                                 if (want_status == FETCH_HEAD_MERGE)
 624                                         warning(_("reject %s because shallow roots are not allowed to be updated"),
 625                                                 rm->peer_ref ? rm->peer_ref->name : rm->name);
 626                                 continue;
 627                         }
 628
 629                         commit = lookup_commit_reference_gently(rm->old_sha1, 1);
 630                         if (!commit)
 631                                 rm->fetch_head_status = FETCH_HEAD_NOT_FOR_MERGE;
 632
 633                         if (rm->fetch_head_status != want_status)
 634                                 continue;
 635
 636                         if (rm->peer_ref) {
 637                                 ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
 638                                 strcpy(ref->name, rm->peer_ref->name);
 639                                 hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
 640                                 hashcpy(ref->new_sha1, rm->old_sha1);
 641                                 ref->force = rm->peer_ref->force;
 642                         }
 643
 644
 645                         if (!strcmp(rm->name, "HEAD")) {
 646                                 kind = "";
 647                                 what = "";
 648                         }
 649                         else if (starts_with(rm->name, "refs/heads/")) {
 650                                 kind = "branch";
 651                                 what = rm->name + 11;
 652                         }
 653                         else if (starts_with(rm->name, "refs/tags/")) {
 654                                 kind = "tag";
 655                                 what = rm->name + 10;
 656                         }
 657                         else if (starts_with(rm->name, "refs/remotes/")) {
 658                                 kind = "remote-tracking branch";
 659                                 what = rm->name + 13;
 660                         }
 661                         else {
 662                                 kind = "";
 663                                 what = rm->name;
 664                         }
 665
 666                         url_len = strlen(url);
 667                         for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 668                                 ;
 669                         url_len = i + 1;
 670                         if (4 < i && !strncmp(".git", url + i - 3, 4))
 671                                 url_len = i - 3;
 672
 673                         strbuf_reset(&note);
 674                         if (*what) {
 675                                 if (*kind)
 676                                         strbuf_addf(&note, "%s ", kind);
 677                                 strbuf_addf(&note, "'%s' of ", what);
 678                         }
 679                         switch (rm->fetch_head_status) {
 680                         case FETCH_HEAD_NOT_FOR_MERGE:
 681                                 merge_status_marker = "not-for-merge";
 682                                 /* fall-through */
 683                         case FETCH_HEAD_MERGE:
 684                                 fprintf(fp, "%s\t%s\t%s",
 685                                         sha1_to_hex(rm->old_sha1),
 686                                         merge_status_marker,
 687                                         note.buf);
 688                                 for (i = 0; i < url_len; ++i)
 689                                         if ('\n' == url[i])
 690                                                 fputs("\\n", fp);
 691                                         else
 692                                                 fputc(url[i], fp);
 693                                 fputc('\n', fp);
 694                                 break;
 695                         default:
 696                                 /* do not write anything to FETCH_HEAD */
 697                                 break;
 698                         }
 699
 700                         strbuf_reset(&note);
 701                         if (ref) {
 702                                 rc |= update_local_ref(ref, what, rm, &note);
 703                                 free(ref);
 704                         } else
 705                                 strbuf_addf(&note, "* %-*s %-*s -> FETCH_HEAD",
 706                                             TRANSPORT_SUMMARY_WIDTH,
 707                                             *kind ? kind : "branch",
 708                                             REFCOL_WIDTH,
 709                                             *what ? what : "HEAD");
 710                         if (note.len) {
 711                                 if (verbosity >= 0 && !shown_url) {
 712                                         fprintf(stderr, _("From %.*s\n"),
 713                                                         url_len, url);
 714                                         shown_url = 1;
 715                                 }
 716                                 if (verbosity >= 0)
 717                                         fprintf(stderr, " %s\n", note.buf);
 718                         }
 719                 }
 720         }
 721
 722         if (rc & STORE_REF_ERROR_DF_CONFLICT)
 723                 error(_("some local refs could not be updated; try running\n"
 724                       " 'git remote prune %s' to remove any old, conflicting "
 725                       "branches"), remote_name);
 726
 727  abort:
 728         strbuf_release(&note);
 729         free(url);
 730         fclose(fp);
 731         return rc;
 732 }
 733
 734 /*
 735  * We would want to bypass the object transfer altogether if
 736  * everything we are going to fetch already exists and is connected
 737  * locally.
 738  */
 739 static int quickfetch(struct ref *ref_map)
 740 {
 741         struct ref *rm = ref_map;
 742
 743         /*
 744          * If we are deepening a shallow clone we already have these
 745          * objects reachable.  Running rev-list here will return with
 746          * a good (0) exit status and we'll bypass the fetch that we
 747          * really need to perform.  Claiming failure now will ensure
 748          * we perform the network exchange to deepen our history.
 749          */
 750         if (depth)
 751                 return -1;
 752         return check_everything_connected(iterate_ref_map, 1, &rm);
 753 }
 754
 755 static int fetch_refs(struct transport *transport, struct ref *ref_map)
 756 {
 757         int ret = quickfetch(ref_map);
 758         if (ret)
 759                 ret = transport_fetch_refs(transport, ref_map);
 760         if (!ret)
 761                 ret |= store_updated_refs(transport->url,
 762                                 transport->remote->name,
 763                                 ref_map);
 764         transport_unlock_pack(transport);
 765         return ret;
 766 }
 767
 768 static int prune_refs(struct refspec *refs, int ref_count, struct ref *ref_map,
 769                 const char *raw_url)
 770 {
 771         int url_len, i, result = 0;
 772         struct ref *ref, *stale_refs = get_stale_heads(refs, ref_count, ref_map);
 773         char *url;
 774         const char *dangling_msg = dry_run
 775                 ? _("   (%s will become dangling)")
 776                 : _("   (%s has become dangling)");
 777
 778         if (raw_url)
 779                 url = transport_anonymize_url(raw_url);
 780         else
 781                 url = xstrdup("foreign");
 782
 783         url_len = strlen(url);
 784         for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 785                 ;
 786
 787         url_len = i + 1;
 788         if (4 < i && !strncmp(".git", url + i - 3, 4))
 789                 url_len = i - 3;
 790
 791         for (ref = stale_refs; ref; ref = ref->next) {
 792                 if (!dry_run)
 793                         result |= delete_ref(ref->name, NULL, 0);
 794                 if (verbosity >= 0 && !shown_url) {
 795                         fprintf(stderr, _("From %.*s\n"), url_len, url);
 796                         shown_url = 1;
 797                 }
 798                 if (verbosity >= 0) {
 799                         fprintf(stderr, " x %-*s %-*s -> %s\n",
 800                                 TRANSPORT_SUMMARY(_("[deleted]")),
 801                                 REFCOL_WIDTH, _("(none)"), prettify_refname(ref->name));
 802                         warn_dangling_symref(stderr, dangling_msg, ref->name);
 803                 }
 804         }
 805         free(url);
 806         free_refs(stale_refs);
 807         return result;
 808 }
 809
 810 static void check_not_current_branch(struct ref *ref_map)
 811 {
 812         struct branch *current_branch = branch_get(NULL);
 813
 814         if (is_bare_repository() || !current_branch)
 815                 return;
 816
 817         for (; ref_map; ref_map = ref_map->next)
 818                 if (ref_map->peer_ref && !strcmp(current_branch->refname,
 819                                         ref_map->peer_ref->name))
 820                         die(_("Refusing to fetch into current branch %s "
 821                             "of non-bare repository"), current_branch->refname);
 822 }
 823
 824 static int truncate_fetch_head(void)
 825 {
 826         const char *filename = git_path("FETCH_HEAD");
 827         FILE *fp = fopen(filename, "w");
 828
 829         if (!fp)
 830                 return error(_("cannot open %s: %s\n"), filename, strerror(errno));
 831         fclose(fp);
 832         return 0;
 833 }
 834
 835 static void set_option(struct transport *transport, const char *name, const char *value)
 836 {
 837         int r = transport_set_option(transport, name, value);
 838         if (r < 0)
 839                 die(_("Option \"%s\" value \"%s\" is not valid for %s"),
 840                     name, value, transport->url);
 841         if (r > 0)
 842                 warning(_("Option \"%s\" is ignored for %s\n"),
 843                         name, transport->url);
 844 }
 845
 846 static struct transport *prepare_transport(struct remote *remote)
 847 {
 848         struct transport *transport;
 849         transport = transport_get(remote, NULL);
 850         transport_set_verbosity(transport, verbosity, progress);
 851         if (upload_pack)
 852                 set_option(transport, TRANS_OPT_UPLOADPACK, upload_pack);
 853         if (keep)
 854                 set_option(transport, TRANS_OPT_KEEP, "yes");
 855         if (depth)
 856                 set_option(transport, TRANS_OPT_DEPTH, depth);
 857         if (update_shallow)
 858                 set_option(transport, TRANS_OPT_UPDATE_SHALLOW, "yes");
 859         return transport;
 860 }
 861
 862 static void backfill_tags(struct transport *transport, struct ref *ref_map)
 863 {
 864         if (transport->cannot_reuse) {
 865                 gsecondary = prepare_transport(transport->remote);
 866                 transport = gsecondary;
 867         }
 868
 869         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
 870         transport_set_option(transport, TRANS_OPT_DEPTH, "0");
 871         fetch_refs(transport, ref_map);
 872
 873         if (gsecondary) {
 874                 transport_disconnect(gsecondary);
 875                 gsecondary = NULL;
 876         }
 877 }
 878
 879 static int do_fetch(struct transport *transport,
 880                     struct refspec *refs, int ref_count)
 881 {
 882         struct string_list existing_refs = STRING_LIST_INIT_DUP;
 883         struct ref *ref_map;
 884         struct ref *rm;
 885         int autotags = (transport->remote->fetch_tags == 1);
 886         int retcode = 0;
 887
 888         for_each_ref(add_existing, &existing_refs);
 889
 890         if (tags == TAGS_DEFAULT) {
 891                 if (transport->remote->fetch_tags == 2)
 892                         tags = TAGS_SET;
 893                 if (transport->remote->fetch_tags == -1)
 894                         tags = TAGS_UNSET;
 895         }
 896
 897         if (!transport->get_refs_list || !transport->fetch)
 898                 die(_("Don't know how to fetch from %s"), transport->url);
 899
 900         /* if not appending, truncate FETCH_HEAD */
 901         if (!append && !dry_run) {
 902                 retcode = truncate_fetch_head();
 903                 if (retcode)
 904                         goto cleanup;
 905         }
 906
 907         ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
 908         if (!update_head_ok)
 909                 check_not_current_branch(ref_map);
 910
 911         for (rm = ref_map; rm; rm = rm->next) {
 912                 if (rm->peer_ref) {
 913                         struct string_list_item *peer_item =
 914                                 string_list_lookup(&existing_refs,
 915                                                    rm->peer_ref->name);
 916                         if (peer_item)
 917                                 hashcpy(rm->peer_ref->old_sha1,
 918                                         peer_item->util);
 919                 }
 920         }
 921
 922         if (tags == TAGS_DEFAULT && autotags)
 923                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
 924         if (prune) {
 925                 /*
 926                  * We only prune based on refspecs specified
 927                  * explicitly (via command line or configuration); we
 928                  * don't care whether --tags was specified.
 929                  */
 930                 if (ref_count) {
 931                         prune_refs(refs, ref_count, ref_map, transport->url);
 932                 } else {
 933                         prune_refs(transport->remote->fetch,
 934                                    transport->remote->fetch_refspec_nr,
 935                                    ref_map,
 936                                    transport->url);
 937                 }
 938         }
 939         if (fetch_refs(transport, ref_map)) {
 940                 free_refs(ref_map);
 941                 retcode = 1;
 942                 goto cleanup;
 943         }
 944         free_refs(ref_map);
 945
 946         /* if neither --no-tags nor --tags was specified, do automated tag
 947          * following ... */
 948         if (tags == TAGS_DEFAULT && autotags) {
 949                 struct ref **tail = &ref_map;
 950                 ref_map = NULL;
 951                 find_non_local_tags(transport, &ref_map, &tail);
 952                 if (ref_map)
 953                         backfill_tags(transport, ref_map);
 954                 free_refs(ref_map);
 955         }
 956
 957  cleanup:
 958         string_list_clear(&existing_refs, 1);
 959         return retcode;
 960 }
 961
 962 static int get_one_remote_for_fetch(struct remote *remote, void *priv)
 963 {
 964         struct string_list *list = priv;
 965         if (!remote->skip_default_update)
 966                 string_list_append(list, remote->name);
 967         return 0;
 968 }
 969
 970 struct remote_group_data {
 971         const char *name;
 972         struct string_list *list;
 973 };
 974
 975 static int get_remote_group(const char *key, const char *value, void *priv)
 976 {
 977         struct remote_group_data *g = priv;
 978
 979         if (starts_with(key, "remotes.") &&
 980                         !strcmp(key + 8, g->name)) {
 981                 /* split list by white space */
 982                 int space = strcspn(value, " \t\n");
 983                 while (*value) {
 984                         if (space > 1) {
 985                                 string_list_append(g->list,
 986                                                    xstrndup(value, space));
 987                         }
 988                         value += space + (value[space] != '\0');
 989                         space = strcspn(value, " \t\n");
 990                 }
 991         }
 992
 993         return 0;
 994 }
 995
 996 static int add_remote_or_group(const char *name, struct string_list *list)
 997 {
 998         int prev_nr = list->nr;
 999         struct remote_group_data g;
1000         g.name = name; g.list = list;
1001
1002         git_config(get_remote_group, &g);
1003         if (list->nr == prev_nr) {
1004                 struct remote *remote;
1005                 if (!remote_is_configured(name))
1006                         return 0;
1007                 remote = remote_get(name);
1008                 string_list_append(list, remote->name);
1009         }
1010         return 1;
1011 }
1012
1013 static void add_options_to_argv(struct argv_array *argv)
1014 {
1015         if (dry_run)
1016                 argv_array_push(argv, "--dry-run");
1017         if (prune != -1)
1018                 argv_array_push(argv, prune ? "--prune" : "--no-prune");
1019         if (update_head_ok)
1020                 argv_array_push(argv, "--update-head-ok");
1021         if (force)
1022                 argv_array_push(argv, "--force");
1023         if (keep)
1024                 argv_array_push(argv, "--keep");
1025         if (recurse_submodules == RECURSE_SUBMODULES_ON)
1026                 argv_array_push(argv, "--recurse-submodules");
1027         else if (recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND)
1028                 argv_array_push(argv, "--recurse-submodules=on-demand");
1029         if (tags == TAGS_SET)
1030                 argv_array_push(argv, "--tags");
1031         else if (tags == TAGS_UNSET)
1032                 argv_array_push(argv, "--no-tags");
1033         if (verbosity >= 2)
1034                 argv_array_push(argv, "-v");
1035         if (verbosity >= 1)
1036                 argv_array_push(argv, "-v");
1037         else if (verbosity < 0)
1038                 argv_array_push(argv, "-q");
1039
1040 }
1041
1042 static int fetch_multiple(struct string_list *list)
1043 {
1044         int i, result = 0;
1045         struct argv_array argv = ARGV_ARRAY_INIT;
1046
1047         if (!append && !dry_run) {
1048                 int errcode = truncate_fetch_head();
1049                 if (errcode)
1050                         return errcode;
1051         }
1052
1053         argv_array_pushl(&argv, "fetch", "--append", NULL);
1054         add_options_to_argv(&argv);
1055
1056         for (i = 0; i < list->nr; i++) {
1057                 const char *name = list->items[i].string;
1058                 argv_array_push(&argv, name);
1059                 if (verbosity >= 0)
1060                         printf(_("Fetching %s\n"), name);
1061                 if (run_command_v_opt(argv.argv, RUN_GIT_CMD)) {
1062                         error(_("Could not fetch %s"), name);
1063                         result = 1;
1064                 }
1065                 argv_array_pop(&argv);
1066         }
1067
1068         argv_array_clear(&argv);
1069         return result;
1070 }
1071
1072 static int fetch_one(struct remote *remote, int argc, const char **argv)
1073 {
1074         static const char **refs = NULL;
1075         struct refspec *refspec;
1076         int ref_nr = 0;
1077         int exit_code;
1078
1079         if (!remote)
1080                 die(_("No remote repository specified.  Please, specify either a URL or a\n"
1081                     "remote name from which new revisions should be fetched."));
1082
1083         gtransport = prepare_transport(remote);
1084
1085         if (prune < 0) {
1086                 /* no command line request */
1087                 if (0 <= gtransport->remote->prune)
1088                         prune = gtransport->remote->prune;
1089                 else if (0 <= fetch_prune_config)
1090                         prune = fetch_prune_config;
1091                 else
1092                         prune = PRUNE_BY_DEFAULT;
1093         }
1094
1095         if (argc > 0) {
1096                 int j = 0;
1097                 int i;
1098                 refs = xcalloc(argc + 1, sizeof(const char *));
1099                 for (i = 0; i < argc; i++) {
1100                         if (!strcmp(argv[i], "tag")) {
1101                                 i++;
1102                                 if (i >= argc)
1103                                         die(_("You need to specify a tag name."));
1104                                 refs[j++] = xstrfmt("refs/tags/%s:refs/tags/%s",
1105                                                     argv[i], argv[i]);
1106                         } else
1107                                 refs[j++] = argv[i];
1108                 }
1109                 refs[j] = NULL;
1110                 ref_nr = j;
1111         }
1112
1113         sigchain_push_common(unlock_pack_on_signal);
1114         atexit(unlock_pack);
1115         refspec = parse_fetch_refspec(ref_nr, refs);
1116         exit_code = do_fetch(gtransport, refspec, ref_nr);
1117         free_refspec(ref_nr, refspec);
1118         transport_disconnect(gtransport);
1119         gtransport = NULL;
1120         return exit_code;
1121 }
1122
1123 int cmd_fetch(int argc, const char **argv, const char *prefix)
1124 {
1125         int i;
1126         struct string_list list = STRING_LIST_INIT_NODUP;
1127         struct remote *remote;
1128         int result = 0;
1129         struct argv_array argv_gc_auto = ARGV_ARRAY_INIT;
1130
1131         packet_trace_identity("fetch");
1132
1133         /* Record the command line for the reflog */
1134         strbuf_addstr(&default_rla, "fetch");
1135         for (i = 1; i < argc; i++)
1136                 strbuf_addf(&default_rla, " %s", argv[i]);
1137
1138         git_config(git_fetch_config, NULL);
1139
1140         argc = parse_options(argc, argv, prefix,
1141                              builtin_fetch_options, builtin_fetch_usage, 0);
1142
1143         if (unshallow) {
1144                 if (depth)
1145                         die(_("--depth and --unshallow cannot be used together"));
1146                 else if (!is_repository_shallow())
1147                         die(_("--unshallow on a complete repository does not make sense"));
1148                 else {
1149                         static char inf_depth[12];
1150                         sprintf(inf_depth, "%d", INFINITE_DEPTH);
1151                         depth = inf_depth;
1152                 }
1153         }
1154
1155         /* no need to be strict, transport_set_option() will validate it again */
1156         if (depth && atoi(depth) < 1)
1157                 die(_("depth %s is not a positive number"), depth);
1158
1159         if (recurse_submodules != RECURSE_SUBMODULES_OFF) {
1160                 if (recurse_submodules_default) {
1161                         int arg = parse_fetch_recurse_submodules_arg("--recurse-submodules-default", recurse_submodules_default);
1162                         set_config_fetch_recurse_submodules(arg);
1163                 }
1164                 gitmodules_config();
1165                 git_config(submodule_config, NULL);
1166         }
1167
1168         if (all) {
1169                 if (argc == 1)
1170                         die(_("fetch --all does not take a repository argument"));
1171                 else if (argc > 1)
1172                         die(_("fetch --all does not make sense with refspecs"));
1173                 (void) for_each_remote(get_one_remote_for_fetch, &list);
1174                 result = fetch_multiple(&list);
1175         } else if (argc == 0) {
1176                 /* No arguments -- use default remote */
1177                 remote = remote_get(NULL);
1178                 result = fetch_one(remote, argc, argv);
1179         } else if (multiple) {
1180                 /* All arguments are assumed to be remotes or groups */
1181                 for (i = 0; i < argc; i++)
1182                         if (!add_remote_or_group(argv[i], &list))
1183                                 die(_("No such remote or remote group: %s"), argv[i]);
1184                 result = fetch_multiple(&list);
1185         } else {
1186                 /* Single remote or group */
1187                 (void) add_remote_or_group(argv[0], &list);
1188                 if (list.nr > 1) {
1189                         /* More than one remote */
1190                         if (argc > 1)
1191                                 die(_("Fetching a group and specifying refspecs does not make sense"));
1192                         result = fetch_multiple(&list);
1193                 } else {
1194                         /* Zero or one remotes */
1195                         remote = remote_get(argv[0]);
1196                         result = fetch_one(remote, argc-1, argv+1);
1197                 }
1198         }
1199
1200         if (!result && (recurse_submodules != RECURSE_SUBMODULES_OFF)) {
1201                 struct argv_array options = ARGV_ARRAY_INIT;
1202
1203                 add_options_to_argv(&options);
1204                 result = fetch_populated_submodules(&options,
1205                                                     submodule_prefix,
1206                                                     recurse_submodules,
1207                                                     verbosity < 0);
1208                 argv_array_clear(&options);
1209         }
1210
1211         /* All names were strdup()ed or strndup()ed */
1212         list.strdup_strings = 1;
1213         string_list_clear(&list, 0);
1214
1215         argv_array_pushl(&argv_gc_auto, "gc", "--auto", NULL);
1216         if (verbosity < 0)
1217                 argv_array_push(&argv_gc_auto, "--quiet");
1218         run_command_v_opt(argv_gc_auto.argv, RUN_GIT_CMD);
1219         argv_array_clear(&argv_gc_auto);
1220
1221         return result;
1222 }