builtin/fetch.c

   1 /*
   2  * "git fetch"
   3  */
   4 #include "cache.h"
   5 #include "refs.h"
   6 #include "commit.h"
   7 #include "builtin.h"
   8 #include "string-list.h"
   9 #include "remote.h"
  10 #include "transport.h"
  11 #include "run-command.h"
  12 #include "parse-options.h"
  13 #include "sigchain.h"
  14 #include "submodule-config.h"
  15 #include "submodule.h"
  16 #include "connected.h"
  17 #include "argv-array.h"
  18
  19 static const char * const builtin_fetch_usage[] = {
  20         N_("git fetch [<options>] [<repository> [<refspec>...]]"),
  21         N_("git fetch [<options>] <group>"),
  22         N_("git fetch --multiple [<options>] [(<repository> | <group>)...]"),
  23         N_("git fetch --all [<options>]"),
  24         NULL
  25 };
  26
  27 enum {
  28         TAGS_UNSET = 0,
  29         TAGS_DEFAULT = 1,
  30         TAGS_SET = 2
  31 };
  32
  33 static int fetch_prune_config = -1; /* unspecified */
  34 static int prune = -1; /* unspecified */
  35 #define PRUNE_BY_DEFAULT 0 /* do we prune by default? */
  36
  37 static int all, append, dry_run, force, keep, multiple, update_head_ok, verbosity;
  38 static int progress = -1, recurse_submodules = RECURSE_SUBMODULES_DEFAULT;
  39 static int tags = TAGS_DEFAULT, unshallow, update_shallow;
  40 static 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,
 420                                    ref->new_sha1,
 421                                    check_old ? ref->old_sha1 : NULL,
 422                                    0, msg, &err))
 423                 goto fail;
 424
 425         ret = ref_transaction_commit(transaction, &err);
 426         if (ret) {
 427                 df_conflict = (ret == TRANSACTION_NAME_CONFLICT);
 428                 goto fail;
 429         }
 430
 431         ref_transaction_free(transaction);
 432         strbuf_release(&err);
 433         return 0;
 434 fail:
 435         ref_transaction_free(transaction);
 436         error("%s", err.buf);
 437         strbuf_release(&err);
 438         return df_conflict ? STORE_REF_ERROR_DF_CONFLICT
 439                            : STORE_REF_ERROR_OTHER;
 440 }
 441
 442 #define REFCOL_WIDTH  10
 443
 444 static int update_local_ref(struct ref *ref,
 445                             const char *remote,
 446                             const struct ref *remote_ref,
 447                             struct strbuf *display)
 448 {
 449         struct commit *current = NULL, *updated;
 450         enum object_type type;
 451         struct branch *current_branch = branch_get(NULL);
 452         const char *pretty_ref = prettify_refname(ref->name);
 453
 454         type = sha1_object_info(ref->new_sha1, NULL);
 455         if (type < 0)
 456                 die(_("object %s not found"), sha1_to_hex(ref->new_sha1));
 457
 458         if (!hashcmp(ref->old_sha1, ref->new_sha1)) {
 459                 if (verbosity > 0)
 460                         strbuf_addf(display, "= %-*s %-*s -> %s",
 461                                     TRANSPORT_SUMMARY(_("[up to date]")),
 462                                     REFCOL_WIDTH, remote, pretty_ref);
 463                 return 0;
 464         }
 465
 466         if (current_branch &&
 467             !strcmp(ref->name, current_branch->name) &&
 468             !(update_head_ok || is_bare_repository()) &&
 469             !is_null_sha1(ref->old_sha1)) {
 470                 /*
 471                  * If this is the head, and it's not okay to update
 472                  * the head, and the old value of the head isn't empty...
 473                  */
 474                 strbuf_addf(display,
 475                             _("! %-*s %-*s -> %s  (can't fetch in current branch)"),
 476                             TRANSPORT_SUMMARY(_("[rejected]")),
 477                             REFCOL_WIDTH, remote, pretty_ref);
 478                 return 1;
 479         }
 480
 481         if (!is_null_sha1(ref->old_sha1) &&
 482             starts_with(ref->name, "refs/tags/")) {
 483                 int r;
 484                 r = s_update_ref("updating tag", ref, 0);
 485                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 486                             r ? '!' : '-',
 487                             TRANSPORT_SUMMARY(_("[tag update]")),
 488                             REFCOL_WIDTH, remote, pretty_ref,
 489                             r ? _("  (unable to update local ref)") : "");
 490                 return r;
 491         }
 492
 493         current = lookup_commit_reference_gently(ref->old_sha1, 1);
 494         updated = lookup_commit_reference_gently(ref->new_sha1, 1);
 495         if (!current || !updated) {
 496                 const char *msg;
 497                 const char *what;
 498                 int r;
 499                 /*
 500                  * Nicely describe the new ref we're fetching.
 501                  * Base this on the remote's ref name, as it's
 502                  * more likely to follow a standard layout.
 503                  */
 504                 const char *name = remote_ref ? remote_ref->name : "";
 505                 if (starts_with(name, "refs/tags/")) {
 506                         msg = "storing tag";
 507                         what = _("[new tag]");
 508                 } else if (starts_with(name, "refs/heads/")) {
 509                         msg = "storing head";
 510                         what = _("[new branch]");
 511                 } else {
 512                         msg = "storing ref";
 513                         what = _("[new ref]");
 514                 }
 515
 516                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 517                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 518                         check_for_new_submodule_commits(ref->new_sha1);
 519                 r = s_update_ref(msg, ref, 0);
 520                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 521                             r ? '!' : '*',
 522                             TRANSPORT_SUMMARY(what),
 523                             REFCOL_WIDTH, remote, pretty_ref,
 524                             r ? _("  (unable to update local ref)") : "");
 525                 return r;
 526         }
 527
 528         if (in_merge_bases(current, updated)) {
 529                 char quickref[83];
 530                 int r;
 531                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 532                 strcat(quickref, "..");
 533                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 534                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 535                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 536                         check_for_new_submodule_commits(ref->new_sha1);
 537                 r = s_update_ref("fast-forward", ref, 1);
 538                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 539                             r ? '!' : ' ',
 540                             TRANSPORT_SUMMARY_WIDTH, quickref,
 541                             REFCOL_WIDTH, remote, pretty_ref,
 542                             r ? _("  (unable to update local ref)") : "");
 543                 return r;
 544         } else if (force || ref->force) {
 545                 char quickref[84];
 546                 int r;
 547                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 548                 strcat(quickref, "...");
 549                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 550                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 551                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 552                         check_for_new_submodule_commits(ref->new_sha1);
 553                 r = s_update_ref("forced-update", ref, 1);
 554                 strbuf_addf(display, "%c %-*s %-*s -> %s  (%s)",
 555                             r ? '!' : '+',
 556                             TRANSPORT_SUMMARY_WIDTH, quickref,
 557                             REFCOL_WIDTH, remote, pretty_ref,
 558                             r ? _("unable to update local ref") : _("forced update"));
 559                 return r;
 560         } else {
 561                 strbuf_addf(display, "! %-*s %-*s -> %s  %s",
 562                             TRANSPORT_SUMMARY(_("[rejected]")),
 563                             REFCOL_WIDTH, remote, pretty_ref,
 564                             _("(non-fast-forward)"));
 565                 return 1;
 566         }
 567 }
 568
 569 static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
 570 {
 571         struct ref **rm = cb_data;
 572         struct ref *ref = *rm;
 573
 574         while (ref && ref->status == REF_STATUS_REJECT_SHALLOW)
 575                 ref = ref->next;
 576         if (!ref)
 577                 return -1; /* end of the list */
 578         *rm = ref->next;
 579         hashcpy(sha1, ref->old_sha1);
 580         return 0;
 581 }
 582
 583 static int store_updated_refs(const char *raw_url, const char *remote_name,
 584                 struct ref *ref_map)
 585 {
 586         FILE *fp;
 587         struct commit *commit;
 588         int url_len, i, rc = 0;
 589         struct strbuf note = STRBUF_INIT;
 590         const char *what, *kind;
 591         struct ref *rm;
 592         char *url;
 593         const char *filename = dry_run ? "/dev/null" : git_path("FETCH_HEAD");
 594         int want_status;
 595
 596         fp = fopen(filename, "a");
 597         if (!fp)
 598                 return error(_("cannot open %s: %s\n"), filename, strerror(errno));
 599
 600         if (raw_url)
 601                 url = transport_anonymize_url(raw_url);
 602         else
 603                 url = xstrdup("foreign");
 604
 605         rm = ref_map;
 606         if (check_everything_connected(iterate_ref_map, 0, &rm)) {
 607                 rc = error(_("%s did not send all necessary objects\n"), url);
 608                 goto abort;
 609         }
 610
 611         /*
 612          * We do a pass for each fetch_head_status type in their enum order, so
 613          * merged entries are written before not-for-merge. That lets readers
 614          * use FETCH_HEAD as a refname to refer to the ref to be merged.
 615          */
 616         for (want_status = FETCH_HEAD_MERGE;
 617              want_status <= FETCH_HEAD_IGNORE;
 618              want_status++) {
 619                 for (rm = ref_map; rm; rm = rm->next) {
 620                         struct ref *ref = NULL;
 621                         const char *merge_status_marker = "";
 622
 623                         if (rm->status == REF_STATUS_REJECT_SHALLOW) {
 624                                 if (want_status == FETCH_HEAD_MERGE)
 625                                         warning(_("reject %s because shallow roots are not allowed to be updated"),
 626                                                 rm->peer_ref ? rm->peer_ref->name : rm->name);
 627                                 continue;
 628                         }
 629
 630                         commit = lookup_commit_reference_gently(rm->old_sha1, 1);
 631                         if (!commit)
 632                                 rm->fetch_head_status = FETCH_HEAD_NOT_FOR_MERGE;
 633
 634                         if (rm->fetch_head_status != want_status)
 635                                 continue;
 636
 637                         if (rm->peer_ref) {
 638                                 ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
 639                                 strcpy(ref->name, rm->peer_ref->name);
 640                                 hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
 641                                 hashcpy(ref->new_sha1, rm->old_sha1);
 642                                 ref->force = rm->peer_ref->force;
 643                         }
 644
 645
 646                         if (!strcmp(rm->name, "HEAD")) {
 647                                 kind = "";
 648                                 what = "";
 649                         }
 650                         else if (starts_with(rm->name, "refs/heads/")) {
 651                                 kind = "branch";
 652                                 what = rm->name + 11;
 653                         }
 654                         else if (starts_with(rm->name, "refs/tags/")) {
 655                                 kind = "tag";
 656                                 what = rm->name + 10;
 657                         }
 658                         else if (starts_with(rm->name, "refs/remotes/")) {
 659                                 kind = "remote-tracking branch";
 660                                 what = rm->name + 13;
 661                         }
 662                         else {
 663                                 kind = "";
 664                                 what = rm->name;
 665                         }
 666
 667                         url_len = strlen(url);
 668                         for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 669                                 ;
 670                         url_len = i + 1;
 671                         if (4 < i && !strncmp(".git", url + i - 3, 4))
 672                                 url_len = i - 3;
 673
 674                         strbuf_reset(&note);
 675                         if (*what) {
 676                                 if (*kind)
 677                                         strbuf_addf(&note, "%s ", kind);
 678                                 strbuf_addf(&note, "'%s' of ", what);
 679                         }
 680                         switch (rm->fetch_head_status) {
 681                         case FETCH_HEAD_NOT_FOR_MERGE:
 682                                 merge_status_marker = "not-for-merge";
 683                                 /* fall-through */
 684                         case FETCH_HEAD_MERGE:
 685                                 fprintf(fp, "%s\t%s\t%s",
 686                                         sha1_to_hex(rm->old_sha1),
 687                                         merge_status_marker,
 688                                         note.buf);
 689                                 for (i = 0; i < url_len; ++i)
 690                                         if ('\n' == url[i])
 691                                                 fputs("\\n", fp);
 692                                         else
 693                                                 fputc(url[i], fp);
 694                                 fputc('\n', fp);
 695                                 break;
 696                         default:
 697                                 /* do not write anything to FETCH_HEAD */
 698                                 break;
 699                         }
 700
 701                         strbuf_reset(&note);
 702                         if (ref) {
 703                                 rc |= update_local_ref(ref, what, rm, &note);
 704                                 free(ref);
 705                         } else
 706                                 strbuf_addf(&note, "* %-*s %-*s -> FETCH_HEAD",
 707                                             TRANSPORT_SUMMARY_WIDTH,
 708                                             *kind ? kind : "branch",
 709                                             REFCOL_WIDTH,
 710                                             *what ? what : "HEAD");
 711                         if (note.len) {
 712                                 if (verbosity >= 0 && !shown_url) {
 713                                         fprintf(stderr, _("From %.*s\n"),
 714                                                         url_len, url);
 715                                         shown_url = 1;
 716                                 }
 717                                 if (verbosity >= 0)
 718                                         fprintf(stderr, " %s\n", note.buf);
 719                         }
 720                 }
 721         }
 722
 723         if (rc & STORE_REF_ERROR_DF_CONFLICT)
 724                 error(_("some local refs could not be updated; try running\n"
 725                       " 'git remote prune %s' to remove any old, conflicting "
 726                       "branches"), remote_name);
 727
 728  abort:
 729         strbuf_release(&note);
 730         free(url);
 731         fclose(fp);
 732         return rc;
 733 }
 734
 735 /*
 736  * We would want to bypass the object transfer altogether if
 737  * everything we are going to fetch already exists and is connected
 738  * locally.
 739  */
 740 static int quickfetch(struct ref *ref_map)
 741 {
 742         struct ref *rm = ref_map;
 743
 744         /*
 745          * If we are deepening a shallow clone we already have these
 746          * objects reachable.  Running rev-list here will return with
 747          * a good (0) exit status and we'll bypass the fetch that we
 748          * really need to perform.  Claiming failure now will ensure
 749          * we perform the network exchange to deepen our history.
 750          */
 751         if (depth)
 752                 return -1;
 753         return check_everything_connected(iterate_ref_map, 1, &rm);
 754 }
 755
 756 static int fetch_refs(struct transport *transport, struct ref *ref_map)
 757 {
 758         int ret = quickfetch(ref_map);
 759         if (ret)
 760                 ret = transport_fetch_refs(transport, ref_map);
 761         if (!ret)
 762                 ret |= store_updated_refs(transport->url,
 763                                 transport->remote->name,
 764                                 ref_map);
 765         transport_unlock_pack(transport);
 766         return ret;
 767 }
 768
 769 static int prune_refs(struct refspec *refs, int ref_count, struct ref *ref_map,
 770                 const char *raw_url)
 771 {
 772         int url_len, i, result = 0;
 773         struct ref *ref, *stale_refs = get_stale_heads(refs, ref_count, ref_map);
 774         char *url;
 775         const char *dangling_msg = dry_run
 776                 ? _("   (%s will become dangling)")
 777                 : _("   (%s has become dangling)");
 778
 779         if (raw_url)
 780                 url = transport_anonymize_url(raw_url);
 781         else
 782                 url = xstrdup("foreign");
 783
 784         url_len = strlen(url);
 785         for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 786                 ;
 787
 788         url_len = i + 1;
 789         if (4 < i && !strncmp(".git", url + i - 3, 4))
 790                 url_len = i - 3;
 791
 792         for (ref = stale_refs; ref; ref = ref->next) {
 793                 if (!dry_run)
 794                         result |= delete_ref(ref->name, NULL, 0);
 795                 if (verbosity >= 0 && !shown_url) {
 796                         fprintf(stderr, _("From %.*s\n"), url_len, url);
 797                         shown_url = 1;
 798                 }
 799                 if (verbosity >= 0) {
 800                         fprintf(stderr, " x %-*s %-*s -> %s\n",
 801                                 TRANSPORT_SUMMARY(_("[deleted]")),
 802                                 REFCOL_WIDTH, _("(none)"), prettify_refname(ref->name));
 803                         warn_dangling_symref(stderr, dangling_msg, ref->name);
 804                 }
 805         }
 806         free(url);
 807         free_refs(stale_refs);
 808         return result;
 809 }
 810
 811 static void check_not_current_branch(struct ref *ref_map)
 812 {
 813         struct branch *current_branch = branch_get(NULL);
 814
 815         if (is_bare_repository() || !current_branch)
 816                 return;
 817
 818         for (; ref_map; ref_map = ref_map->next)
 819                 if (ref_map->peer_ref && !strcmp(current_branch->refname,
 820                                         ref_map->peer_ref->name))
 821                         die(_("Refusing to fetch into current branch %s "
 822                             "of non-bare repository"), current_branch->refname);
 823 }
 824
 825 static int truncate_fetch_head(void)
 826 {
 827         const char *filename = git_path("FETCH_HEAD");
 828         FILE *fp = fopen(filename, "w");
 829
 830         if (!fp)
 831                 return error(_("cannot open %s: %s\n"), filename, strerror(errno));
 832         fclose(fp);
 833         return 0;
 834 }
 835
 836 static void set_option(struct transport *transport, const char *name, const char *value)
 837 {
 838         int r = transport_set_option(transport, name, value);
 839         if (r < 0)
 840                 die(_("Option \"%s\" value \"%s\" is not valid for %s"),
 841                     name, value, transport->url);
 842         if (r > 0)
 843                 warning(_("Option \"%s\" is ignored for %s\n"),
 844                         name, transport->url);
 845 }
 846
 847 static struct transport *prepare_transport(struct remote *remote)
 848 {
 849         struct transport *transport;
 850         transport = transport_get(remote, NULL);
 851         transport_set_verbosity(transport, verbosity, progress);
 852         if (upload_pack)
 853                 set_option(transport, TRANS_OPT_UPLOADPACK, upload_pack);
 854         if (keep)
 855                 set_option(transport, TRANS_OPT_KEEP, "yes");
 856         if (depth)
 857                 set_option(transport, TRANS_OPT_DEPTH, depth);
 858         if (update_shallow)
 859                 set_option(transport, TRANS_OPT_UPDATE_SHALLOW, "yes");
 860         return transport;
 861 }
 862
 863 static void backfill_tags(struct transport *transport, struct ref *ref_map)
 864 {
 865         if (transport->cannot_reuse) {
 866                 gsecondary = prepare_transport(transport->remote);
 867                 transport = gsecondary;
 868         }
 869
 870         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
 871         transport_set_option(transport, TRANS_OPT_DEPTH, "0");
 872         fetch_refs(transport, ref_map);
 873
 874         if (gsecondary) {
 875                 transport_disconnect(gsecondary);
 876                 gsecondary = NULL;
 877         }
 878 }
 879
 880 static int do_fetch(struct transport *transport,
 881                     struct refspec *refs, int ref_count)
 882 {
 883         struct string_list existing_refs = STRING_LIST_INIT_DUP;
 884         struct ref *ref_map;
 885         struct ref *rm;
 886         int autotags = (transport->remote->fetch_tags == 1);
 887         int retcode = 0;
 888
 889         for_each_ref(add_existing, &existing_refs);
 890
 891         if (tags == TAGS_DEFAULT) {
 892                 if (transport->remote->fetch_tags == 2)
 893                         tags = TAGS_SET;
 894                 if (transport->remote->fetch_tags == -1)
 895                         tags = TAGS_UNSET;
 896         }
 897
 898         if (!transport->get_refs_list || !transport->fetch)
 899                 die(_("Don't know how to fetch from %s"), transport->url);
 900
 901         /* if not appending, truncate FETCH_HEAD */
 902         if (!append && !dry_run) {
 903                 retcode = truncate_fetch_head();
 904                 if (retcode)
 905                         goto cleanup;
 906         }
 907
 908         ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
 909         if (!update_head_ok)
 910                 check_not_current_branch(ref_map);
 911
 912         for (rm = ref_map; rm; rm = rm->next) {
 913                 if (rm->peer_ref) {
 914                         struct string_list_item *peer_item =
 915                                 string_list_lookup(&existing_refs,
 916                                                    rm->peer_ref->name);
 917                         if (peer_item)
 918                                 hashcpy(rm->peer_ref->old_sha1,
 919                                         peer_item->util);
 920                 }
 921         }
 922
 923         if (tags == TAGS_DEFAULT && autotags)
 924                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
 925         if (prune) {
 926                 /*
 927                  * We only prune based on refspecs specified
 928                  * explicitly (via command line or configuration); we
 929                  * don't care whether --tags was specified.
 930                  */
 931                 if (ref_count) {
 932                         prune_refs(refs, ref_count, ref_map, transport->url);
 933                 } else {
 934                         prune_refs(transport->remote->fetch,
 935                                    transport->remote->fetch_refspec_nr,
 936                                    ref_map,
 937                                    transport->url);
 938                 }
 939         }
 940         if (fetch_refs(transport, ref_map)) {
 941                 free_refs(ref_map);
 942                 retcode = 1;
 943                 goto cleanup;
 944         }
 945         free_refs(ref_map);
 946
 947         /* if neither --no-tags nor --tags was specified, do automated tag
 948          * following ... */
 949         if (tags == TAGS_DEFAULT && autotags) {
 950                 struct ref **tail = &ref_map;
 951                 ref_map = NULL;
 952                 find_non_local_tags(transport, &ref_map, &tail);
 953                 if (ref_map)
 954                         backfill_tags(transport, ref_map);
 955                 free_refs(ref_map);
 956         }
 957
 958  cleanup:
 959         string_list_clear(&existing_refs, 1);
 960         return retcode;
 961 }
 962
 963 static int get_one_remote_for_fetch(struct remote *remote, void *priv)
 964 {
 965         struct string_list *list = priv;
 966         if (!remote->skip_default_update)
 967                 string_list_append(list, remote->name);
 968         return 0;
 969 }
 970
 971 struct remote_group_data {
 972         const char *name;
 973         struct string_list *list;
 974 };
 975
 976 static int get_remote_group(const char *key, const char *value, void *priv)
 977 {
 978         struct remote_group_data *g = priv;
 979
 980         if (starts_with(key, "remotes.") &&
 981                         !strcmp(key + 8, g->name)) {
 982                 /* split list by white space */
 983                 int space = strcspn(value, " \t\n");
 984                 while (*value) {
 985                         if (space > 1) {
 986                                 string_list_append(g->list,
 987                                                    xstrndup(value, space));
 988                         }
 989                         value += space + (value[space] != '\0');
 990                         space = strcspn(value, " \t\n");
 991                 }
 992         }
 993
 994         return 0;
 995 }
 996
 997 static int add_remote_or_group(const char *name, struct string_list *list)
 998 {
 999         int prev_nr = list->nr;
1000         struct remote_group_data g;
1001         g.name = name; g.list = list;
1002
1003         git_config(get_remote_group, &g);
1004         if (list->nr == prev_nr) {
1005                 struct remote *remote;
1006                 if (!remote_is_configured(name))
1007                         return 0;
1008                 remote = remote_get(name);
1009                 string_list_append(list, remote->name);
1010         }
1011         return 1;
1012 }
1013
1014 static void add_options_to_argv(struct argv_array *argv)
1015 {
1016         if (dry_run)
1017                 argv_array_push(argv, "--dry-run");
1018         if (prune != -1)
1019                 argv_array_push(argv, prune ? "--prune" : "--no-prune");
1020         if (update_head_ok)
1021                 argv_array_push(argv, "--update-head-ok");
1022         if (force)
1023                 argv_array_push(argv, "--force");
1024         if (keep)
1025                 argv_array_push(argv, "--keep");
1026         if (recurse_submodules == RECURSE_SUBMODULES_ON)
1027                 argv_array_push(argv, "--recurse-submodules");
1028         else if (recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND)
1029                 argv_array_push(argv, "--recurse-submodules=on-demand");
1030         if (tags == TAGS_SET)
1031                 argv_array_push(argv, "--tags");
1032         else if (tags == TAGS_UNSET)
1033                 argv_array_push(argv, "--no-tags");
1034         if (verbosity >= 2)
1035                 argv_array_push(argv, "-v");
1036         if (verbosity >= 1)
1037                 argv_array_push(argv, "-v");
1038         else if (verbosity < 0)
1039                 argv_array_push(argv, "-q");
1040
1041 }
1042
1043 static int fetch_multiple(struct string_list *list)
1044 {
1045         int i, result = 0;
1046         struct argv_array argv = ARGV_ARRAY_INIT;
1047
1048         if (!append && !dry_run) {
1049                 int errcode = truncate_fetch_head();
1050                 if (errcode)
1051                         return errcode;
1052         }
1053
1054         argv_array_pushl(&argv, "fetch", "--append", NULL);
1055         add_options_to_argv(&argv);
1056
1057         for (i = 0; i < list->nr; i++) {
1058                 const char *name = list->items[i].string;
1059                 argv_array_push(&argv, name);
1060                 if (verbosity >= 0)
1061                         printf(_("Fetching %s\n"), name);
1062                 if (run_command_v_opt(argv.argv, RUN_GIT_CMD)) {
1063                         error(_("Could not fetch %s"), name);
1064                         result = 1;
1065                 }
1066                 argv_array_pop(&argv);
1067         }
1068
1069         argv_array_clear(&argv);
1070         return result;
1071 }
1072
1073 static int fetch_one(struct remote *remote, int argc, const char **argv)
1074 {
1075         static const char **refs = NULL;
1076         struct refspec *refspec;
1077         int ref_nr = 0;
1078         int exit_code;
1079
1080         if (!remote)
1081                 die(_("No remote repository specified.  Please, specify either a URL or a\n"
1082                     "remote name from which new revisions should be fetched."));
1083
1084         gtransport = prepare_transport(remote);
1085
1086         if (prune < 0) {
1087                 /* no command line request */
1088                 if (0 <= gtransport->remote->prune)
1089                         prune = gtransport->remote->prune;
1090                 else if (0 <= fetch_prune_config)
1091                         prune = fetch_prune_config;
1092                 else
1093                         prune = PRUNE_BY_DEFAULT;
1094         }
1095
1096         if (argc > 0) {
1097                 int j = 0;
1098                 int i;
1099                 refs = xcalloc(argc + 1, sizeof(const char *));
1100                 for (i = 0; i < argc; i++) {
1101                         if (!strcmp(argv[i], "tag")) {
1102                                 i++;
1103                                 if (i >= argc)
1104                                         die(_("You need to specify a tag name."));
1105                                 refs[j++] = xstrfmt("refs/tags/%s:refs/tags/%s",
1106                                                     argv[i], argv[i]);
1107                         } else
1108                                 refs[j++] = argv[i];
1109                 }
1110                 refs[j] = NULL;
1111                 ref_nr = j;
1112         }
1113
1114         sigchain_push_common(unlock_pack_on_signal);
1115         atexit(unlock_pack);
1116         refspec = parse_fetch_refspec(ref_nr, refs);
1117         exit_code = do_fetch(gtransport, refspec, ref_nr);
1118         free_refspec(ref_nr, refspec);
1119         transport_disconnect(gtransport);
1120         gtransport = NULL;
1121         return exit_code;
1122 }
1123
1124 int cmd_fetch(int argc, const char **argv, const char *prefix)
1125 {
1126         int i;
1127         struct string_list list = STRING_LIST_INIT_NODUP;
1128         struct remote *remote;
1129         int result = 0;
1130         struct argv_array argv_gc_auto = ARGV_ARRAY_INIT;
1131
1132         packet_trace_identity("fetch");
1133
1134         /* Record the command line for the reflog */
1135         strbuf_addstr(&default_rla, "fetch");
1136         for (i = 1; i < argc; i++)
1137                 strbuf_addf(&default_rla, " %s", argv[i]);
1138
1139         git_config(git_fetch_config, NULL);
1140
1141         argc = parse_options(argc, argv, prefix,
1142                              builtin_fetch_options, builtin_fetch_usage, 0);
1143
1144         if (unshallow) {
1145                 if (depth)
1146                         die(_("--depth and --unshallow cannot be used together"));
1147                 else if (!is_repository_shallow())
1148                         die(_("--unshallow on a complete repository does not make sense"));
1149                 else {
1150                         static char inf_depth[12];
1151                         sprintf(inf_depth, "%d", INFINITE_DEPTH);
1152                         depth = inf_depth;
1153                 }
1154         }
1155
1156         /* no need to be strict, transport_set_option() will validate it again */
1157         if (depth && atoi(depth) < 1)
1158                 die(_("depth %s is not a positive number"), depth);
1159
1160         if (recurse_submodules != RECURSE_SUBMODULES_OFF) {
1161                 if (recurse_submodules_default) {
1162                         int arg = parse_fetch_recurse_submodules_arg("--recurse-submodules-default", recurse_submodules_default);
1163                         set_config_fetch_recurse_submodules(arg);
1164                 }
1165                 gitmodules_config();
1166                 git_config(submodule_config, NULL);
1167         }
1168
1169         if (all) {
1170                 if (argc == 1)
1171                         die(_("fetch --all does not take a repository argument"));
1172                 else if (argc > 1)
1173                         die(_("fetch --all does not make sense with refspecs"));
1174                 (void) for_each_remote(get_one_remote_for_fetch, &list);
1175                 result = fetch_multiple(&list);
1176         } else if (argc == 0) {
1177                 /* No arguments -- use default remote */
1178                 remote = remote_get(NULL);
1179                 result = fetch_one(remote, argc, argv);
1180         } else if (multiple) {
1181                 /* All arguments are assumed to be remotes or groups */
1182                 for (i = 0; i < argc; i++)
1183                         if (!add_remote_or_group(argv[i], &list))
1184                                 die(_("No such remote or remote group: %s"), argv[i]);
1185                 result = fetch_multiple(&list);
1186         } else {
1187                 /* Single remote or group */
1188                 (void) add_remote_or_group(argv[0], &list);
1189                 if (list.nr > 1) {
1190                         /* More than one remote */
1191                         if (argc > 1)
1192                                 die(_("Fetching a group and specifying refspecs does not make sense"));
1193                         result = fetch_multiple(&list);
1194                 } else {
1195                         /* Zero or one remotes */
1196                         remote = remote_get(argv[0]);
1197                         result = fetch_one(remote, argc-1, argv+1);
1198                 }
1199         }
1200
1201         if (!result && (recurse_submodules != RECURSE_SUBMODULES_OFF)) {
1202                 struct argv_array options = ARGV_ARRAY_INIT;
1203
1204                 add_options_to_argv(&options);
1205                 result = fetch_populated_submodules(&options,
1206                                                     submodule_prefix,
1207                                                     recurse_submodules,
1208                                                     verbosity < 0);
1209                 argv_array_clear(&options);
1210         }
1211
1212         /* All names were strdup()ed or strndup()ed */
1213         list.strdup_strings = 1;
1214         string_list_clear(&list, 0);
1215
1216         argv_array_pushl(&argv_gc_auto, "gc", "--auto", NULL);
1217         if (verbosity < 0)
1218                 argv_array_push(&argv_gc_auto, "--quiet");
1219         run_command_v_opt(argv_gc_auto.argv, RUN_GIT_CMD);
1220         argv_array_clear(&argv_gc_auto);
1221
1222         return result;
1223 }