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         struct each_ref_fn_sha1_adapter wrapped_add_existing =
 212                 {add_existing, &existing_refs};
 213
 214         for_each_ref(each_ref_fn_adapter, &wrapped_add_existing);
 215         for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
 216                 if (!starts_with(ref->name, "refs/tags/"))
 217                         continue;
 218
 219                 /*
 220                  * The peeled ref always follows the matching base
 221                  * ref, so if we see a peeled ref that we don't want
 222                  * to fetch then we can mark the ref entry in the list
 223                  * as one to ignore by setting util to NULL.
 224                  */
 225                 if (ends_with(ref->name, "^{}")) {
 226                         if (item && !has_sha1_file(ref->old_sha1) &&
 227                             !will_fetch(head, ref->old_sha1) &&
 228                             !has_sha1_file(item->util) &&
 229                             !will_fetch(head, item->util))
 230                                 item->util = NULL;
 231                         item = NULL;
 232                         continue;
 233                 }
 234
 235                 /*
 236                  * If item is non-NULL here, then we previously saw a
 237                  * ref not followed by a peeled reference, so we need
 238                  * to check if it is a lightweight tag that we want to
 239                  * fetch.
 240                  */
 241                 if (item && !has_sha1_file(item->util) &&
 242                     !will_fetch(head, item->util))
 243                         item->util = NULL;
 244
 245                 item = NULL;
 246
 247                 /* skip duplicates and refs that we already have */
 248                 if (string_list_has_string(&remote_refs, ref->name) ||
 249                     string_list_has_string(&existing_refs, ref->name))
 250                         continue;
 251
 252                 item = string_list_insert(&remote_refs, ref->name);
 253                 item->util = (void *)ref->old_sha1;
 254         }
 255         string_list_clear(&existing_refs, 1);
 256
 257         /*
 258          * We may have a final lightweight tag that needs to be
 259          * checked to see if it needs fetching.
 260          */
 261         if (item && !has_sha1_file(item->util) &&
 262             !will_fetch(head, item->util))
 263                 item->util = NULL;
 264
 265         /*
 266          * For all the tags in the remote_refs string list,
 267          * add them to the list of refs to be fetched
 268          */
 269         for_each_string_list_item(item, &remote_refs) {
 270                 /* Unless we have already decided to ignore this item... */
 271                 if (item->util)
 272                 {
 273                         struct ref *rm = alloc_ref(item->string);
 274                         rm->peer_ref = alloc_ref(item->string);
 275                         hashcpy(rm->old_sha1, item->util);
 276                         **tail = rm;
 277                         *tail = &rm->next;
 278                 }
 279         }
 280
 281         string_list_clear(&remote_refs, 0);
 282 }
 283
 284 static struct ref *get_ref_map(struct transport *transport,
 285                                struct refspec *refspecs, int refspec_count,
 286                                int tags, int *autotags)
 287 {
 288         int i;
 289         struct ref *rm;
 290         struct ref *ref_map = NULL;
 291         struct ref **tail = &ref_map;
 292
 293         /* opportunistically-updated references: */
 294         struct ref *orefs = NULL, **oref_tail = &orefs;
 295
 296         const struct ref *remote_refs = transport_get_remote_refs(transport);
 297
 298         if (refspec_count) {
 299                 struct refspec *fetch_refspec;
 300                 int fetch_refspec_nr;
 301
 302                 for (i = 0; i < refspec_count; i++) {
 303                         get_fetch_map(remote_refs, &refspecs[i], &tail, 0);
 304                         if (refspecs[i].dst && refspecs[i].dst[0])
 305                                 *autotags = 1;
 306                 }
 307                 /* Merge everything on the command line (but not --tags) */
 308                 for (rm = ref_map; rm; rm = rm->next)
 309                         rm->fetch_head_status = FETCH_HEAD_MERGE;
 310
 311                 /*
 312                  * For any refs that we happen to be fetching via
 313                  * command-line arguments, the destination ref might
 314                  * have been missing or have been different than the
 315                  * remote-tracking ref that would be derived from the
 316                  * configured refspec.  In these cases, we want to
 317                  * take the opportunity to update their configured
 318                  * remote-tracking reference.  However, we do not want
 319                  * to mention these entries in FETCH_HEAD at all, as
 320                  * they would simply be duplicates of existing
 321                  * entries, so we set them FETCH_HEAD_IGNORE below.
 322                  *
 323                  * We compute these entries now, based only on the
 324                  * refspecs specified on the command line.  But we add
 325                  * them to the list following the refspecs resulting
 326                  * from the tags option so that one of the latter,
 327                  * which has FETCH_HEAD_NOT_FOR_MERGE, is not removed
 328                  * by ref_remove_duplicates() in favor of one of these
 329                  * opportunistic entries with FETCH_HEAD_IGNORE.
 330                  */
 331                 if (refmap_array) {
 332                         fetch_refspec = parse_fetch_refspec(refmap_nr, refmap_array);
 333                         fetch_refspec_nr = refmap_nr;
 334                 } else {
 335                         fetch_refspec = transport->remote->fetch;
 336                         fetch_refspec_nr = transport->remote->fetch_refspec_nr;
 337                 }
 338
 339                 for (i = 0; i < fetch_refspec_nr; i++)
 340                         get_fetch_map(ref_map, &fetch_refspec[i], &oref_tail, 1);
 341
 342                 if (tags == TAGS_SET)
 343                         get_fetch_map(remote_refs, tag_refspec, &tail, 0);
 344         } else if (refmap_array) {
 345                 die("--refmap option is only meaningful with command-line refspec(s).");
 346         } else {
 347                 /* Use the defaults */
 348                 struct remote *remote = transport->remote;
 349                 struct branch *branch = branch_get(NULL);
 350                 int has_merge = branch_has_merge_config(branch);
 351                 if (remote &&
 352                     (remote->fetch_refspec_nr ||
 353                      /* Note: has_merge implies non-NULL branch->remote_name */
 354                      (has_merge && !strcmp(branch->remote_name, remote->name)))) {
 355                         for (i = 0; i < remote->fetch_refspec_nr; i++) {
 356                                 get_fetch_map(remote_refs, &remote->fetch[i], &tail, 0);
 357                                 if (remote->fetch[i].dst &&
 358                                     remote->fetch[i].dst[0])
 359                                         *autotags = 1;
 360                                 if (!i && !has_merge && ref_map &&
 361                                     !remote->fetch[0].pattern)
 362                                         ref_map->fetch_head_status = FETCH_HEAD_MERGE;
 363                         }
 364                         /*
 365                          * if the remote we're fetching from is the same
 366                          * as given in branch.<name>.remote, we add the
 367                          * ref given in branch.<name>.merge, too.
 368                          *
 369                          * Note: has_merge implies non-NULL branch->remote_name
 370                          */
 371                         if (has_merge &&
 372                             !strcmp(branch->remote_name, remote->name))
 373                                 add_merge_config(&ref_map, remote_refs, branch, &tail);
 374                 } else {
 375                         ref_map = get_remote_ref(remote_refs, "HEAD");
 376                         if (!ref_map)
 377                                 die(_("Couldn't find remote ref HEAD"));
 378                         ref_map->fetch_head_status = FETCH_HEAD_MERGE;
 379                         tail = &ref_map->next;
 380                 }
 381         }
 382
 383         if (tags == TAGS_SET)
 384                 /* also fetch all tags */
 385                 get_fetch_map(remote_refs, tag_refspec, &tail, 0);
 386         else if (tags == TAGS_DEFAULT && *autotags)
 387                 find_non_local_tags(transport, &ref_map, &tail);
 388
 389         /* Now append any refs to be updated opportunistically: */
 390         *tail = orefs;
 391         for (rm = orefs; rm; rm = rm->next) {
 392                 rm->fetch_head_status = FETCH_HEAD_IGNORE;
 393                 tail = &rm->next;
 394         }
 395
 396         return ref_remove_duplicates(ref_map);
 397 }
 398
 399 #define STORE_REF_ERROR_OTHER 1
 400 #define STORE_REF_ERROR_DF_CONFLICT 2
 401
 402 static int s_update_ref(const char *action,
 403                         struct ref *ref,
 404                         int check_old)
 405 {
 406         char msg[1024];
 407         char *rla = getenv("GIT_REFLOG_ACTION");
 408         struct ref_transaction *transaction;
 409         struct strbuf err = STRBUF_INIT;
 410         int ret, df_conflict = 0;
 411
 412         if (dry_run)
 413                 return 0;
 414         if (!rla)
 415                 rla = default_rla.buf;
 416         snprintf(msg, sizeof(msg), "%s: %s", rla, action);
 417
 418         transaction = ref_transaction_begin(&err);
 419         if (!transaction ||
 420             ref_transaction_update(transaction, ref->name,
 421                                    ref->new_sha1,
 422                                    check_old ? ref->old_sha1 : NULL,
 423                                    0, msg, &err))
 424                 goto fail;
 425
 426         ret = ref_transaction_commit(transaction, &err);
 427         if (ret) {
 428                 df_conflict = (ret == TRANSACTION_NAME_CONFLICT);
 429                 goto fail;
 430         }
 431
 432         ref_transaction_free(transaction);
 433         strbuf_release(&err);
 434         return 0;
 435 fail:
 436         ref_transaction_free(transaction);
 437         error("%s", err.buf);
 438         strbuf_release(&err);
 439         return df_conflict ? STORE_REF_ERROR_DF_CONFLICT
 440                            : STORE_REF_ERROR_OTHER;
 441 }
 442
 443 #define REFCOL_WIDTH  10
 444
 445 static int update_local_ref(struct ref *ref,
 446                             const char *remote,
 447                             const struct ref *remote_ref,
 448                             struct strbuf *display)
 449 {
 450         struct commit *current = NULL, *updated;
 451         enum object_type type;
 452         struct branch *current_branch = branch_get(NULL);
 453         const char *pretty_ref = prettify_refname(ref->name);
 454
 455         type = sha1_object_info(ref->new_sha1, NULL);
 456         if (type < 0)
 457                 die(_("object %s not found"), sha1_to_hex(ref->new_sha1));
 458
 459         if (!hashcmp(ref->old_sha1, ref->new_sha1)) {
 460                 if (verbosity > 0)
 461                         strbuf_addf(display, "= %-*s %-*s -> %s",
 462                                     TRANSPORT_SUMMARY(_("[up to date]")),
 463                                     REFCOL_WIDTH, remote, pretty_ref);
 464                 return 0;
 465         }
 466
 467         if (current_branch &&
 468             !strcmp(ref->name, current_branch->name) &&
 469             !(update_head_ok || is_bare_repository()) &&
 470             !is_null_sha1(ref->old_sha1)) {
 471                 /*
 472                  * If this is the head, and it's not okay to update
 473                  * the head, and the old value of the head isn't empty...
 474                  */
 475                 strbuf_addf(display,
 476                             _("! %-*s %-*s -> %s  (can't fetch in current branch)"),
 477                             TRANSPORT_SUMMARY(_("[rejected]")),
 478                             REFCOL_WIDTH, remote, pretty_ref);
 479                 return 1;
 480         }
 481
 482         if (!is_null_sha1(ref->old_sha1) &&
 483             starts_with(ref->name, "refs/tags/")) {
 484                 int r;
 485                 r = s_update_ref("updating tag", ref, 0);
 486                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 487                             r ? '!' : '-',
 488                             TRANSPORT_SUMMARY(_("[tag update]")),
 489                             REFCOL_WIDTH, remote, pretty_ref,
 490                             r ? _("  (unable to update local ref)") : "");
 491                 return r;
 492         }
 493
 494         current = lookup_commit_reference_gently(ref->old_sha1, 1);
 495         updated = lookup_commit_reference_gently(ref->new_sha1, 1);
 496         if (!current || !updated) {
 497                 const char *msg;
 498                 const char *what;
 499                 int r;
 500                 /*
 501                  * Nicely describe the new ref we're fetching.
 502                  * Base this on the remote's ref name, as it's
 503                  * more likely to follow a standard layout.
 504                  */
 505                 const char *name = remote_ref ? remote_ref->name : "";
 506                 if (starts_with(name, "refs/tags/")) {
 507                         msg = "storing tag";
 508                         what = _("[new tag]");
 509                 } else if (starts_with(name, "refs/heads/")) {
 510                         msg = "storing head";
 511                         what = _("[new branch]");
 512                 } else {
 513                         msg = "storing ref";
 514                         what = _("[new ref]");
 515                 }
 516
 517                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 518                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 519                         check_for_new_submodule_commits(ref->new_sha1);
 520                 r = s_update_ref(msg, ref, 0);
 521                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 522                             r ? '!' : '*',
 523                             TRANSPORT_SUMMARY(what),
 524                             REFCOL_WIDTH, remote, pretty_ref,
 525                             r ? _("  (unable to update local ref)") : "");
 526                 return r;
 527         }
 528
 529         if (in_merge_bases(current, updated)) {
 530                 char quickref[83];
 531                 int r;
 532                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 533                 strcat(quickref, "..");
 534                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 535                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 536                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 537                         check_for_new_submodule_commits(ref->new_sha1);
 538                 r = s_update_ref("fast-forward", ref, 1);
 539                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 540                             r ? '!' : ' ',
 541                             TRANSPORT_SUMMARY_WIDTH, quickref,
 542                             REFCOL_WIDTH, remote, pretty_ref,
 543                             r ? _("  (unable to update local ref)") : "");
 544                 return r;
 545         } else if (force || ref->force) {
 546                 char quickref[84];
 547                 int r;
 548                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 549                 strcat(quickref, "...");
 550                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 551                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 552                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 553                         check_for_new_submodule_commits(ref->new_sha1);
 554                 r = s_update_ref("forced-update", ref, 1);
 555                 strbuf_addf(display, "%c %-*s %-*s -> %s  (%s)",
 556                             r ? '!' : '+',
 557                             TRANSPORT_SUMMARY_WIDTH, quickref,
 558                             REFCOL_WIDTH, remote, pretty_ref,
 559                             r ? _("unable to update local ref") : _("forced update"));
 560                 return r;
 561         } else {
 562                 strbuf_addf(display, "! %-*s %-*s -> %s  %s",
 563                             TRANSPORT_SUMMARY(_("[rejected]")),
 564                             REFCOL_WIDTH, remote, pretty_ref,
 565                             _("(non-fast-forward)"));
 566                 return 1;
 567         }
 568 }
 569
 570 static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
 571 {
 572         struct ref **rm = cb_data;
 573         struct ref *ref = *rm;
 574
 575         while (ref && ref->status == REF_STATUS_REJECT_SHALLOW)
 576                 ref = ref->next;
 577         if (!ref)
 578                 return -1; /* end of the list */
 579         *rm = ref->next;
 580         hashcpy(sha1, ref->old_sha1);
 581         return 0;
 582 }
 583
 584 static int store_updated_refs(const char *raw_url, const char *remote_name,
 585                 struct ref *ref_map)
 586 {
 587         FILE *fp;
 588         struct commit *commit;
 589         int url_len, i, rc = 0;
 590         struct strbuf note = STRBUF_INIT;
 591         const char *what, *kind;
 592         struct ref *rm;
 593         char *url;
 594         const char *filename = dry_run ? "/dev/null" : git_path("FETCH_HEAD");
 595         int want_status;
 596
 597         fp = fopen(filename, "a");
 598         if (!fp)
 599                 return error(_("cannot open %s: %s\n"), filename, strerror(errno));
 600
 601         if (raw_url)
 602                 url = transport_anonymize_url(raw_url);
 603         else
 604                 url = xstrdup("foreign");
 605
 606         rm = ref_map;
 607         if (check_everything_connected(iterate_ref_map, 0, &rm)) {
 608                 rc = error(_("%s did not send all necessary objects\n"), url);
 609                 goto abort;
 610         }
 611
 612         /*
 613          * We do a pass for each fetch_head_status type in their enum order, so
 614          * merged entries are written before not-for-merge. That lets readers
 615          * use FETCH_HEAD as a refname to refer to the ref to be merged.
 616          */
 617         for (want_status = FETCH_HEAD_MERGE;
 618              want_status <= FETCH_HEAD_IGNORE;
 619              want_status++) {
 620                 for (rm = ref_map; rm; rm = rm->next) {
 621                         struct ref *ref = NULL;
 622                         const char *merge_status_marker = "";
 623
 624                         if (rm->status == REF_STATUS_REJECT_SHALLOW) {
 625                                 if (want_status == FETCH_HEAD_MERGE)
 626                                         warning(_("reject %s because shallow roots are not allowed to be updated"),
 627                                                 rm->peer_ref ? rm->peer_ref->name : rm->name);
 628                                 continue;
 629                         }
 630
 631                         commit = lookup_commit_reference_gently(rm->old_sha1, 1);
 632                         if (!commit)
 633                                 rm->fetch_head_status = FETCH_HEAD_NOT_FOR_MERGE;
 634
 635                         if (rm->fetch_head_status != want_status)
 636                                 continue;
 637
 638                         if (rm->peer_ref) {
 639                                 ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
 640                                 strcpy(ref->name, rm->peer_ref->name);
 641                                 hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
 642                                 hashcpy(ref->new_sha1, rm->old_sha1);
 643                                 ref->force = rm->peer_ref->force;
 644                         }
 645
 646
 647                         if (!strcmp(rm->name, "HEAD")) {
 648                                 kind = "";
 649                                 what = "";
 650                         }
 651                         else if (starts_with(rm->name, "refs/heads/")) {
 652                                 kind = "branch";
 653                                 what = rm->name + 11;
 654                         }
 655                         else if (starts_with(rm->name, "refs/tags/")) {
 656                                 kind = "tag";
 657                                 what = rm->name + 10;
 658                         }
 659                         else if (starts_with(rm->name, "refs/remotes/")) {
 660                                 kind = "remote-tracking branch";
 661                                 what = rm->name + 13;
 662                         }
 663                         else {
 664                                 kind = "";
 665                                 what = rm->name;
 666                         }
 667
 668                         url_len = strlen(url);
 669                         for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 670                                 ;
 671                         url_len = i + 1;
 672                         if (4 < i && !strncmp(".git", url + i - 3, 4))
 673                                 url_len = i - 3;
 674
 675                         strbuf_reset(&note);
 676                         if (*what) {
 677                                 if (*kind)
 678                                         strbuf_addf(&note, "%s ", kind);
 679                                 strbuf_addf(&note, "'%s' of ", what);
 680                         }
 681                         switch (rm->fetch_head_status) {
 682                         case FETCH_HEAD_NOT_FOR_MERGE:
 683                                 merge_status_marker = "not-for-merge";
 684                                 /* fall-through */
 685                         case FETCH_HEAD_MERGE:
 686                                 fprintf(fp, "%s\t%s\t%s",
 687                                         sha1_to_hex(rm->old_sha1),
 688                                         merge_status_marker,
 689                                         note.buf);
 690                                 for (i = 0; i < url_len; ++i)
 691                                         if ('\n' == url[i])
 692                                                 fputs("\\n", fp);
 693                                         else
 694                                                 fputc(url[i], fp);
 695                                 fputc('\n', fp);
 696                                 break;
 697                         default:
 698                                 /* do not write anything to FETCH_HEAD */
 699                                 break;
 700                         }
 701
 702                         strbuf_reset(&note);
 703                         if (ref) {
 704                                 rc |= update_local_ref(ref, what, rm, &note);
 705                                 free(ref);
 706                         } else
 707                                 strbuf_addf(&note, "* %-*s %-*s -> FETCH_HEAD",
 708                                             TRANSPORT_SUMMARY_WIDTH,
 709                                             *kind ? kind : "branch",
 710                                             REFCOL_WIDTH,
 711                                             *what ? what : "HEAD");
 712                         if (note.len) {
 713                                 if (verbosity >= 0 && !shown_url) {
 714                                         fprintf(stderr, _("From %.*s\n"),
 715                                                         url_len, url);
 716                                         shown_url = 1;
 717                                 }
 718                                 if (verbosity >= 0)
 719                                         fprintf(stderr, " %s\n", note.buf);
 720                         }
 721                 }
 722         }
 723
 724         if (rc & STORE_REF_ERROR_DF_CONFLICT)
 725                 error(_("some local refs could not be updated; try running\n"
 726                       " 'git remote prune %s' to remove any old, conflicting "
 727                       "branches"), remote_name);
 728
 729  abort:
 730         strbuf_release(&note);
 731         free(url);
 732         fclose(fp);
 733         return rc;
 734 }
 735
 736 /*
 737  * We would want to bypass the object transfer altogether if
 738  * everything we are going to fetch already exists and is connected
 739  * locally.
 740  */
 741 static int quickfetch(struct ref *ref_map)
 742 {
 743         struct ref *rm = ref_map;
 744
 745         /*
 746          * If we are deepening a shallow clone we already have these
 747          * objects reachable.  Running rev-list here will return with
 748          * a good (0) exit status and we'll bypass the fetch that we
 749          * really need to perform.  Claiming failure now will ensure
 750          * we perform the network exchange to deepen our history.
 751          */
 752         if (depth)
 753                 return -1;
 754         return check_everything_connected(iterate_ref_map, 1, &rm);
 755 }
 756
 757 static int fetch_refs(struct transport *transport, struct ref *ref_map)
 758 {
 759         int ret = quickfetch(ref_map);
 760         if (ret)
 761                 ret = transport_fetch_refs(transport, ref_map);
 762         if (!ret)
 763                 ret |= store_updated_refs(transport->url,
 764                                 transport->remote->name,
 765                                 ref_map);
 766         transport_unlock_pack(transport);
 767         return ret;
 768 }
 769
 770 static int prune_refs(struct refspec *refs, int ref_count, struct ref *ref_map,
 771                 const char *raw_url)
 772 {
 773         int url_len, i, result = 0;
 774         struct ref *ref, *stale_refs = get_stale_heads(refs, ref_count, ref_map);
 775         char *url;
 776         const char *dangling_msg = dry_run
 777                 ? _("   (%s will become dangling)")
 778                 : _("   (%s has become dangling)");
 779
 780         if (raw_url)
 781                 url = transport_anonymize_url(raw_url);
 782         else
 783                 url = xstrdup("foreign");
 784
 785         url_len = strlen(url);
 786         for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 787                 ;
 788
 789         url_len = i + 1;
 790         if (4 < i && !strncmp(".git", url + i - 3, 4))
 791                 url_len = i - 3;
 792
 793         for (ref = stale_refs; ref; ref = ref->next) {
 794                 if (!dry_run)
 795                         result |= delete_ref(ref->name, NULL, 0);
 796                 if (verbosity >= 0 && !shown_url) {
 797                         fprintf(stderr, _("From %.*s\n"), url_len, url);
 798                         shown_url = 1;
 799                 }
 800                 if (verbosity >= 0) {
 801                         fprintf(stderr, " x %-*s %-*s -> %s\n",
 802                                 TRANSPORT_SUMMARY(_("[deleted]")),
 803                                 REFCOL_WIDTH, _("(none)"), prettify_refname(ref->name));
 804                         warn_dangling_symref(stderr, dangling_msg, ref->name);
 805                 }
 806         }
 807         free(url);
 808         free_refs(stale_refs);
 809         return result;
 810 }
 811
 812 static void check_not_current_branch(struct ref *ref_map)
 813 {
 814         struct branch *current_branch = branch_get(NULL);
 815
 816         if (is_bare_repository() || !current_branch)
 817                 return;
 818
 819         for (; ref_map; ref_map = ref_map->next)
 820                 if (ref_map->peer_ref && !strcmp(current_branch->refname,
 821                                         ref_map->peer_ref->name))
 822                         die(_("Refusing to fetch into current branch %s "
 823                             "of non-bare repository"), current_branch->refname);
 824 }
 825
 826 static int truncate_fetch_head(void)
 827 {
 828         const char *filename = git_path("FETCH_HEAD");
 829         FILE *fp = fopen(filename, "w");
 830
 831         if (!fp)
 832                 return error(_("cannot open %s: %s\n"), filename, strerror(errno));
 833         fclose(fp);
 834         return 0;
 835 }
 836
 837 static void set_option(struct transport *transport, const char *name, const char *value)
 838 {
 839         int r = transport_set_option(transport, name, value);
 840         if (r < 0)
 841                 die(_("Option \"%s\" value \"%s\" is not valid for %s"),
 842                     name, value, transport->url);
 843         if (r > 0)
 844                 warning(_("Option \"%s\" is ignored for %s\n"),
 845                         name, transport->url);
 846 }
 847
 848 static struct transport *prepare_transport(struct remote *remote)
 849 {
 850         struct transport *transport;
 851         transport = transport_get(remote, NULL);
 852         transport_set_verbosity(transport, verbosity, progress);
 853         if (upload_pack)
 854                 set_option(transport, TRANS_OPT_UPLOADPACK, upload_pack);
 855         if (keep)
 856                 set_option(transport, TRANS_OPT_KEEP, "yes");
 857         if (depth)
 858                 set_option(transport, TRANS_OPT_DEPTH, depth);
 859         if (update_shallow)
 860                 set_option(transport, TRANS_OPT_UPDATE_SHALLOW, "yes");
 861         return transport;
 862 }
 863
 864 static void backfill_tags(struct transport *transport, struct ref *ref_map)
 865 {
 866         if (transport->cannot_reuse) {
 867                 gsecondary = prepare_transport(transport->remote);
 868                 transport = gsecondary;
 869         }
 870
 871         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
 872         transport_set_option(transport, TRANS_OPT_DEPTH, "0");
 873         fetch_refs(transport, ref_map);
 874
 875         if (gsecondary) {
 876                 transport_disconnect(gsecondary);
 877                 gsecondary = NULL;
 878         }
 879 }
 880
 881 static int do_fetch(struct transport *transport,
 882                     struct refspec *refs, int ref_count)
 883 {
 884         struct string_list existing_refs = STRING_LIST_INIT_DUP;
 885         struct ref *ref_map;
 886         struct ref *rm;
 887         int autotags = (transport->remote->fetch_tags == 1);
 888         int retcode = 0;
 889         struct each_ref_fn_sha1_adapter wrapped_add_existing =
 890                 {add_existing, &existing_refs};
 891
 892         for_each_ref(each_ref_fn_adapter, &wrapped_add_existing);
 893
 894         if (tags == TAGS_DEFAULT) {
 895                 if (transport->remote->fetch_tags == 2)
 896                         tags = TAGS_SET;
 897                 if (transport->remote->fetch_tags == -1)
 898                         tags = TAGS_UNSET;
 899         }
 900
 901         if (!transport->get_refs_list || !transport->fetch)
 902                 die(_("Don't know how to fetch from %s"), transport->url);
 903
 904         /* if not appending, truncate FETCH_HEAD */
 905         if (!append && !dry_run) {
 906                 retcode = truncate_fetch_head();
 907                 if (retcode)
 908                         goto cleanup;
 909         }
 910
 911         ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
 912         if (!update_head_ok)
 913                 check_not_current_branch(ref_map);
 914
 915         for (rm = ref_map; rm; rm = rm->next) {
 916                 if (rm->peer_ref) {
 917                         struct string_list_item *peer_item =
 918                                 string_list_lookup(&existing_refs,
 919                                                    rm->peer_ref->name);
 920                         if (peer_item)
 921                                 hashcpy(rm->peer_ref->old_sha1,
 922                                         peer_item->util);
 923                 }
 924         }
 925
 926         if (tags == TAGS_DEFAULT && autotags)
 927                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
 928         if (prune) {
 929                 /*
 930                  * We only prune based on refspecs specified
 931                  * explicitly (via command line or configuration); we
 932                  * don't care whether --tags was specified.
 933                  */
 934                 if (ref_count) {
 935                         prune_refs(refs, ref_count, ref_map, transport->url);
 936                 } else {
 937                         prune_refs(transport->remote->fetch,
 938                                    transport->remote->fetch_refspec_nr,
 939                                    ref_map,
 940                                    transport->url);
 941                 }
 942         }
 943         if (fetch_refs(transport, ref_map)) {
 944                 free_refs(ref_map);
 945                 retcode = 1;
 946                 goto cleanup;
 947         }
 948         free_refs(ref_map);
 949
 950         /* if neither --no-tags nor --tags was specified, do automated tag
 951          * following ... */
 952         if (tags == TAGS_DEFAULT && autotags) {
 953                 struct ref **tail = &ref_map;
 954                 ref_map = NULL;
 955                 find_non_local_tags(transport, &ref_map, &tail);
 956                 if (ref_map)
 957                         backfill_tags(transport, ref_map);
 958                 free_refs(ref_map);
 959         }
 960
 961  cleanup:
 962         string_list_clear(&existing_refs, 1);
 963         return retcode;
 964 }
 965
 966 static int get_one_remote_for_fetch(struct remote *remote, void *priv)
 967 {
 968         struct string_list *list = priv;
 969         if (!remote->skip_default_update)
 970                 string_list_append(list, remote->name);
 971         return 0;
 972 }
 973
 974 struct remote_group_data {
 975         const char *name;
 976         struct string_list *list;
 977 };
 978
 979 static int get_remote_group(const char *key, const char *value, void *priv)
 980 {
 981         struct remote_group_data *g = priv;
 982
 983         if (starts_with(key, "remotes.") &&
 984                         !strcmp(key + 8, g->name)) {
 985                 /* split list by white space */
 986                 int space = strcspn(value, " \t\n");
 987                 while (*value) {
 988                         if (space > 1) {
 989                                 string_list_append(g->list,
 990                                                    xstrndup(value, space));
 991                         }
 992                         value += space + (value[space] != '\0');
 993                         space = strcspn(value, " \t\n");
 994                 }
 995         }
 996
 997         return 0;
 998 }
 999
1000 static int add_remote_or_group(const char *name, struct string_list *list)
1001 {
1002         int prev_nr = list->nr;
1003         struct remote_group_data g;
1004         g.name = name; g.list = list;
1005
1006         git_config(get_remote_group, &g);
1007         if (list->nr == prev_nr) {
1008                 struct remote *remote;
1009                 if (!remote_is_configured(name))
1010                         return 0;
1011                 remote = remote_get(name);
1012                 string_list_append(list, remote->name);
1013         }
1014         return 1;
1015 }
1016
1017 static void add_options_to_argv(struct argv_array *argv)
1018 {
1019         if (dry_run)
1020                 argv_array_push(argv, "--dry-run");
1021         if (prune != -1)
1022                 argv_array_push(argv, prune ? "--prune" : "--no-prune");
1023         if (update_head_ok)
1024                 argv_array_push(argv, "--update-head-ok");
1025         if (force)
1026                 argv_array_push(argv, "--force");
1027         if (keep)
1028                 argv_array_push(argv, "--keep");
1029         if (recurse_submodules == RECURSE_SUBMODULES_ON)
1030                 argv_array_push(argv, "--recurse-submodules");
1031         else if (recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND)
1032                 argv_array_push(argv, "--recurse-submodules=on-demand");
1033         if (tags == TAGS_SET)
1034                 argv_array_push(argv, "--tags");
1035         else if (tags == TAGS_UNSET)
1036                 argv_array_push(argv, "--no-tags");
1037         if (verbosity >= 2)
1038                 argv_array_push(argv, "-v");
1039         if (verbosity >= 1)
1040                 argv_array_push(argv, "-v");
1041         else if (verbosity < 0)
1042                 argv_array_push(argv, "-q");
1043
1044 }
1045
1046 static int fetch_multiple(struct string_list *list)
1047 {
1048         int i, result = 0;
1049         struct argv_array argv = ARGV_ARRAY_INIT;
1050
1051         if (!append && !dry_run) {
1052                 int errcode = truncate_fetch_head();
1053                 if (errcode)
1054                         return errcode;
1055         }
1056
1057         argv_array_pushl(&argv, "fetch", "--append", NULL);
1058         add_options_to_argv(&argv);
1059
1060         for (i = 0; i < list->nr; i++) {
1061                 const char *name = list->items[i].string;
1062                 argv_array_push(&argv, name);
1063                 if (verbosity >= 0)
1064                         printf(_("Fetching %s\n"), name);
1065                 if (run_command_v_opt(argv.argv, RUN_GIT_CMD)) {
1066                         error(_("Could not fetch %s"), name);
1067                         result = 1;
1068                 }
1069                 argv_array_pop(&argv);
1070         }
1071
1072         argv_array_clear(&argv);
1073         return result;
1074 }
1075
1076 static int fetch_one(struct remote *remote, int argc, const char **argv)
1077 {
1078         static const char **refs = NULL;
1079         struct refspec *refspec;
1080         int ref_nr = 0;
1081         int exit_code;
1082
1083         if (!remote)
1084                 die(_("No remote repository specified.  Please, specify either a URL or a\n"
1085                     "remote name from which new revisions should be fetched."));
1086
1087         gtransport = prepare_transport(remote);
1088
1089         if (prune < 0) {
1090                 /* no command line request */
1091                 if (0 <= gtransport->remote->prune)
1092                         prune = gtransport->remote->prune;
1093                 else if (0 <= fetch_prune_config)
1094                         prune = fetch_prune_config;
1095                 else
1096                         prune = PRUNE_BY_DEFAULT;
1097         }
1098
1099         if (argc > 0) {
1100                 int j = 0;
1101                 int i;
1102                 refs = xcalloc(argc + 1, sizeof(const char *));
1103                 for (i = 0; i < argc; i++) {
1104                         if (!strcmp(argv[i], "tag")) {
1105                                 i++;
1106                                 if (i >= argc)
1107                                         die(_("You need to specify a tag name."));
1108                                 refs[j++] = xstrfmt("refs/tags/%s:refs/tags/%s",
1109                                                     argv[i], argv[i]);
1110                         } else
1111                                 refs[j++] = argv[i];
1112                 }
1113                 refs[j] = NULL;
1114                 ref_nr = j;
1115         }
1116
1117         sigchain_push_common(unlock_pack_on_signal);
1118         atexit(unlock_pack);
1119         refspec = parse_fetch_refspec(ref_nr, refs);
1120         exit_code = do_fetch(gtransport, refspec, ref_nr);
1121         free_refspec(ref_nr, refspec);
1122         transport_disconnect(gtransport);
1123         gtransport = NULL;
1124         return exit_code;
1125 }
1126
1127 int cmd_fetch(int argc, const char **argv, const char *prefix)
1128 {
1129         int i;
1130         struct string_list list = STRING_LIST_INIT_NODUP;
1131         struct remote *remote;
1132         int result = 0;
1133         struct argv_array argv_gc_auto = ARGV_ARRAY_INIT;
1134
1135         packet_trace_identity("fetch");
1136
1137         /* Record the command line for the reflog */
1138         strbuf_addstr(&default_rla, "fetch");
1139         for (i = 1; i < argc; i++)
1140                 strbuf_addf(&default_rla, " %s", argv[i]);
1141
1142         git_config(git_fetch_config, NULL);
1143
1144         argc = parse_options(argc, argv, prefix,
1145                              builtin_fetch_options, builtin_fetch_usage, 0);
1146
1147         if (unshallow) {
1148                 if (depth)
1149                         die(_("--depth and --unshallow cannot be used together"));
1150                 else if (!is_repository_shallow())
1151                         die(_("--unshallow on a complete repository does not make sense"));
1152                 else {
1153                         static char inf_depth[12];
1154                         sprintf(inf_depth, "%d", INFINITE_DEPTH);
1155                         depth = inf_depth;
1156                 }
1157         }
1158
1159         /* no need to be strict, transport_set_option() will validate it again */
1160         if (depth && atoi(depth) < 1)
1161                 die(_("depth %s is not a positive number"), depth);
1162
1163         if (recurse_submodules != RECURSE_SUBMODULES_OFF) {
1164                 if (recurse_submodules_default) {
1165                         int arg = parse_fetch_recurse_submodules_arg("--recurse-submodules-default", recurse_submodules_default);
1166                         set_config_fetch_recurse_submodules(arg);
1167                 }
1168                 gitmodules_config();
1169                 git_config(submodule_config, NULL);
1170         }
1171
1172         if (all) {
1173                 if (argc == 1)
1174                         die(_("fetch --all does not take a repository argument"));
1175                 else if (argc > 1)
1176                         die(_("fetch --all does not make sense with refspecs"));
1177                 (void) for_each_remote(get_one_remote_for_fetch, &list);
1178                 result = fetch_multiple(&list);
1179         } else if (argc == 0) {
1180                 /* No arguments -- use default remote */
1181                 remote = remote_get(NULL);
1182                 result = fetch_one(remote, argc, argv);
1183         } else if (multiple) {
1184                 /* All arguments are assumed to be remotes or groups */
1185                 for (i = 0; i < argc; i++)
1186                         if (!add_remote_or_group(argv[i], &list))
1187                                 die(_("No such remote or remote group: %s"), argv[i]);
1188                 result = fetch_multiple(&list);
1189         } else {
1190                 /* Single remote or group */
1191                 (void) add_remote_or_group(argv[0], &list);
1192                 if (list.nr > 1) {
1193                         /* More than one remote */
1194                         if (argc > 1)
1195                                 die(_("Fetching a group and specifying refspecs does not make sense"));
1196                         result = fetch_multiple(&list);
1197                 } else {
1198                         /* Zero or one remotes */
1199                         remote = remote_get(argv[0]);
1200                         result = fetch_one(remote, argc-1, argv+1);
1201                 }
1202         }
1203
1204         if (!result && (recurse_submodules != RECURSE_SUBMODULES_OFF)) {
1205                 struct argv_array options = ARGV_ARRAY_INIT;
1206
1207                 add_options_to_argv(&options);
1208                 result = fetch_populated_submodules(&options,
1209                                                     submodule_prefix,
1210                                                     recurse_submodules,
1211                                                     verbosity < 0);
1212                 argv_array_clear(&options);
1213         }
1214
1215         /* All names were strdup()ed or strndup()ed */
1216         list.strdup_strings = 1;
1217         string_list_clear(&list, 0);
1218
1219         argv_array_pushl(&argv_gc_auto, "gc", "--auto", NULL);
1220         if (verbosity < 0)
1221                 argv_array_push(&argv_gc_auto, "--quiet");
1222         run_command_v_opt(argv_gc_auto.argv, RUN_GIT_CMD);
1223         argv_array_clear(&argv_gc_auto);
1224
1225         return result;
1226 }