builtin/fetch.c

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