builtin/fetch.c

   1 /*
   2  * "git fetch"
   3  */
   4 #include "cache.h"
   5 #include "refs.h"
   6 #include "commit.h"
   7 #include "builtin.h"
   8 #include "string-list.h"
   9 #include "remote.h"
  10 #include "transport.h"
  11 #include "run-command.h"
  12 #include "parse-options.h"
  13 #include "sigchain.h"
  14 #include "transport.h"
  15 #include "submodule.h"
  16 #include "connected.h"
  17 #include "argv-array.h"
  18
  19 static const char * const builtin_fetch_usage[] = {
  20         N_("git fetch [<options>] [<repository> [<refspec>...]]"),
  21         N_("git fetch [<options>] <group>"),
  22         N_("git fetch --multiple [<options>] [(<repository> | <group>)...]"),
  23         N_("git fetch --all [<options>]"),
  24         NULL
  25 };
  26
  27 enum {
  28         TAGS_UNSET = 0,
  29         TAGS_DEFAULT = 1,
  30         TAGS_SET = 2
  31 };
  32
  33 static int fetch_prune_config = -1; /* unspecified */
  34 static int prune = -1; /* unspecified */
  35 #define PRUNE_BY_DEFAULT 0 /* do we prune by default? */
  36
  37 static int all, append, dry_run, force, keep, multiple, update_head_ok, verbosity;
  38 static int progress = -1, recurse_submodules = RECURSE_SUBMODULES_DEFAULT;
  39 static int tags = TAGS_DEFAULT, unshallow, update_shallow;
  40 static const char *depth;
  41 static const char *upload_pack;
  42 static struct strbuf default_rla = STRBUF_INIT;
  43 static struct transport *gtransport;
  44 static struct transport *gsecondary;
  45 static const char *submodule_prefix = "";
  46 static const char *recurse_submodules_default;
  47 static int shown_url = 0;
  48
  49 static int option_parse_recurse_submodules(const struct option *opt,
  50                                    const char *arg, int unset)
  51 {
  52         if (unset) {
  53                 recurse_submodules = RECURSE_SUBMODULES_OFF;
  54         } else {
  55                 if (arg)
  56                         recurse_submodules = parse_fetch_recurse_submodules_arg(opt->long_name, arg);
  57                 else
  58                         recurse_submodules = RECURSE_SUBMODULES_ON;
  59         }
  60         return 0;
  61 }
  62
  63 static int git_fetch_config(const char *k, const char *v, void *cb)
  64 {
  65         if (!strcmp(k, "fetch.prune")) {
  66                 fetch_prune_config = git_config_bool(k, v);
  67                 return 0;
  68         }
  69         return 0;
  70 }
  71
  72 static struct option builtin_fetch_options[] = {
  73         OPT__VERBOSITY(&verbosity),
  74         OPT_BOOL(0, "all", &all,
  75                  N_("fetch from all remotes")),
  76         OPT_BOOL('a', "append", &append,
  77                  N_("append to .git/FETCH_HEAD instead of overwriting")),
  78         OPT_STRING(0, "upload-pack", &upload_pack, N_("path"),
  79                    N_("path to upload pack on remote end")),
  80         OPT__FORCE(&force, N_("force overwrite of local branch")),
  81         OPT_BOOL('m', "multiple", &multiple,
  82                  N_("fetch from multiple remotes")),
  83         OPT_SET_INT('t', "tags", &tags,
  84                     N_("fetch all tags and associated objects"), TAGS_SET),
  85         OPT_SET_INT('n', NULL, &tags,
  86                     N_("do not fetch all tags (--no-tags)"), TAGS_UNSET),
  87         OPT_BOOL('p', "prune", &prune,
  88                  N_("prune remote-tracking branches no longer on remote")),
  89         { OPTION_CALLBACK, 0, "recurse-submodules", NULL, N_("on-demand"),
  90                     N_("control recursive fetching of submodules"),
  91                     PARSE_OPT_OPTARG, option_parse_recurse_submodules },
  92         OPT_BOOL(0, "dry-run", &dry_run,
  93                  N_("dry run")),
  94         OPT_BOOL('k', "keep", &keep, N_("keep downloaded pack")),
  95         OPT_BOOL('u', "update-head-ok", &update_head_ok,
  96                     N_("allow updating of HEAD ref")),
  97         OPT_BOOL(0, "progress", &progress, N_("force progress reporting")),
  98         OPT_STRING(0, "depth", &depth, N_("depth"),
  99                    N_("deepen history of shallow clone")),
 100         { OPTION_SET_INT, 0, "unshallow", &unshallow, NULL,
 101                    N_("convert to a complete repository"),
 102                    PARSE_OPT_NONEG | PARSE_OPT_NOARG, NULL, 1 },
 103         { OPTION_STRING, 0, "submodule-prefix", &submodule_prefix, N_("dir"),
 104                    N_("prepend this to submodule path output"), PARSE_OPT_HIDDEN },
 105         { OPTION_STRING, 0, "recurse-submodules-default",
 106                    &recurse_submodules_default, NULL,
 107                    N_("default mode for recursion"), PARSE_OPT_HIDDEN },
 108         OPT_BOOL(0, "update-shallow", &update_shallow,
 109                  N_("accept refs that update .git/shallow")),
 110         OPT_END()
 111 };
 112
 113 static void unlock_pack(void)
 114 {
 115         if (gtransport)
 116                 transport_unlock_pack(gtransport);
 117         if (gsecondary)
 118                 transport_unlock_pack(gsecondary);
 119 }
 120
 121 static void unlock_pack_on_signal(int signo)
 122 {
 123         unlock_pack();
 124         sigchain_pop(signo);
 125         raise(signo);
 126 }
 127
 128 static void add_merge_config(struct ref **head,
 129                            const struct ref *remote_refs,
 130                            struct branch *branch,
 131                            struct ref ***tail)
 132 {
 133         int i;
 134
 135         for (i = 0; i < branch->merge_nr; i++) {
 136                 struct ref *rm, **old_tail = *tail;
 137                 struct refspec refspec;
 138
 139                 for (rm = *head; rm; rm = rm->next) {
 140                         if (branch_merge_matches(branch, i, rm->name)) {
 141                                 rm->fetch_head_status = FETCH_HEAD_MERGE;
 142                                 break;
 143                         }
 144                 }
 145                 if (rm)
 146                         continue;
 147
 148                 /*
 149                  * Not fetched to a remote-tracking branch?  We need to fetch
 150                  * it anyway to allow this branch's "branch.$name.merge"
 151                  * to be honored by 'git pull', but we do not have to
 152                  * fail if branch.$name.merge is misconfigured to point
 153                  * at a nonexisting branch.  If we were indeed called by
 154                  * 'git pull', it will notice the misconfiguration because
 155                  * there is no entry in the resulting FETCH_HEAD marked
 156                  * for merging.
 157                  */
 158                 memset(&refspec, 0, sizeof(refspec));
 159                 refspec.src = branch->merge[i]->src;
 160                 get_fetch_map(remote_refs, &refspec, tail, 1);
 161                 for (rm = *old_tail; rm; rm = rm->next)
 162                         rm->fetch_head_status = FETCH_HEAD_MERGE;
 163         }
 164 }
 165
 166 static int add_existing(const char *refname, const unsigned char *sha1,
 167                         int flag, void *cbdata)
 168 {
 169         struct string_list *list = (struct string_list *)cbdata;
 170         struct string_list_item *item = string_list_insert(list, refname);
 171         item->util = xmalloc(20);
 172         hashcpy(item->util, sha1);
 173         return 0;
 174 }
 175
 176 static int will_fetch(struct ref **head, const unsigned char *sha1)
 177 {
 178         struct ref *rm = *head;
 179         while (rm) {
 180                 if (!hashcmp(rm->old_sha1, sha1))
 181                         return 1;
 182                 rm = rm->next;
 183         }
 184         return 0;
 185 }
 186
 187 static void find_non_local_tags(struct transport *transport,
 188                         struct ref **head,
 189                         struct ref ***tail)
 190 {
 191         struct string_list existing_refs = STRING_LIST_INIT_DUP;
 192         struct string_list remote_refs = STRING_LIST_INIT_NODUP;
 193         const struct ref *ref;
 194         struct string_list_item *item = NULL;
 195
 196         for_each_ref(add_existing, &existing_refs);
 197         for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
 198                 if (!starts_with(ref->name, "refs/tags/"))
 199                         continue;
 200
 201                 /*
 202                  * The peeled ref always follows the matching base
 203                  * ref, so if we see a peeled ref that we don't want
 204                  * to fetch then we can mark the ref entry in the list
 205                  * as one to ignore by setting util to NULL.
 206                  */
 207                 if (ends_with(ref->name, "^{}")) {
 208                         if (item && !has_sha1_file(ref->old_sha1) &&
 209                             !will_fetch(head, ref->old_sha1) &&
 210                             !has_sha1_file(item->util) &&
 211                             !will_fetch(head, item->util))
 212                                 item->util = NULL;
 213                         item = NULL;
 214                         continue;
 215                 }
 216
 217                 /*
 218                  * If item is non-NULL here, then we previously saw a
 219                  * ref not followed by a peeled reference, so we need
 220                  * to check if it is a lightweight tag that we want to
 221                  * fetch.
 222                  */
 223                 if (item && !has_sha1_file(item->util) &&
 224                     !will_fetch(head, item->util))
 225                         item->util = NULL;
 226
 227                 item = NULL;
 228
 229                 /* skip duplicates and refs that we already have */
 230                 if (string_list_has_string(&remote_refs, ref->name) ||
 231                     string_list_has_string(&existing_refs, ref->name))
 232                         continue;
 233
 234                 item = string_list_insert(&remote_refs, ref->name);
 235                 item->util = (void *)ref->old_sha1;
 236         }
 237         string_list_clear(&existing_refs, 1);
 238
 239         /*
 240          * We may have a final lightweight tag that needs to be
 241          * checked to see if it needs fetching.
 242          */
 243         if (item && !has_sha1_file(item->util) &&
 244             !will_fetch(head, item->util))
 245                 item->util = NULL;
 246
 247         /*
 248          * For all the tags in the remote_refs string list,
 249          * add them to the list of refs to be fetched
 250          */
 251         for_each_string_list_item(item, &remote_refs) {
 252                 /* Unless we have already decided to ignore this item... */
 253                 if (item->util)
 254                 {
 255                         struct ref *rm = alloc_ref(item->string);
 256                         rm->peer_ref = alloc_ref(item->string);
 257                         hashcpy(rm->old_sha1, item->util);
 258                         **tail = rm;
 259                         *tail = &rm->next;
 260                 }
 261         }
 262
 263         string_list_clear(&remote_refs, 0);
 264 }
 265
 266 static struct ref *get_ref_map(struct transport *transport,
 267                                struct refspec *refspecs, int refspec_count,
 268                                int tags, int *autotags)
 269 {
 270         int i;
 271         struct ref *rm;
 272         struct ref *ref_map = NULL;
 273         struct ref **tail = &ref_map;
 274
 275         /* opportunistically-updated references: */
 276         struct ref *orefs = NULL, **oref_tail = &orefs;
 277
 278         const struct ref *remote_refs = transport_get_remote_refs(transport);
 279
 280         if (refspec_count) {
 281                 for (i = 0; i < refspec_count; i++) {
 282                         get_fetch_map(remote_refs, &refspecs[i], &tail, 0);
 283                         if (refspecs[i].dst && refspecs[i].dst[0])
 284                                 *autotags = 1;
 285                 }
 286                 /* Merge everything on the command line (but not --tags) */
 287                 for (rm = ref_map; rm; rm = rm->next)
 288                         rm->fetch_head_status = FETCH_HEAD_MERGE;
 289
 290                 /*
 291                  * For any refs that we happen to be fetching via
 292                  * command-line arguments, the destination ref might
 293                  * have been missing or have been different than the
 294                  * remote-tracking ref that would be derived from the
 295                  * configured refspec.  In these cases, we want to
 296                  * take the opportunity to update their configured
 297                  * remote-tracking reference.  However, we do not want
 298                  * to mention these entries in FETCH_HEAD at all, as
 299                  * they would simply be duplicates of existing
 300                  * entries, so we set them FETCH_HEAD_IGNORE below.
 301                  *
 302                  * We compute these entries now, based only on the
 303                  * refspecs specified on the command line.  But we add
 304                  * them to the list following the refspecs resulting
 305                  * from the tags option so that one of the latter,
 306                  * which has FETCH_HEAD_NOT_FOR_MERGE, is not removed
 307                  * by ref_remove_duplicates() in favor of one of these
 308                  * opportunistic entries with FETCH_HEAD_IGNORE.
 309                  */
 310                 for (i = 0; i < transport->remote->fetch_refspec_nr; i++)
 311                         get_fetch_map(ref_map, &transport->remote->fetch[i],
 312                                       &oref_tail, 1);
 313
 314                 if (tags == TAGS_SET)
 315                         get_fetch_map(remote_refs, tag_refspec, &tail, 0);
 316         } else {
 317                 /* Use the defaults */
 318                 struct remote *remote = transport->remote;
 319                 struct branch *branch = branch_get(NULL);
 320                 int has_merge = branch_has_merge_config(branch);
 321                 if (remote &&
 322                     (remote->fetch_refspec_nr ||
 323                      /* Note: has_merge implies non-NULL branch->remote_name */
 324                      (has_merge && !strcmp(branch->remote_name, remote->name)))) {
 325                         for (i = 0; i < remote->fetch_refspec_nr; i++) {
 326                                 get_fetch_map(remote_refs, &remote->fetch[i], &tail, 0);
 327                                 if (remote->fetch[i].dst &&
 328                                     remote->fetch[i].dst[0])
 329                                         *autotags = 1;
 330                                 if (!i && !has_merge && ref_map &&
 331                                     !remote->fetch[0].pattern)
 332                                         ref_map->fetch_head_status = FETCH_HEAD_MERGE;
 333                         }
 334                         /*
 335                          * if the remote we're fetching from is the same
 336                          * as given in branch.<name>.remote, we add the
 337                          * ref given in branch.<name>.merge, too.
 338                          *
 339                          * Note: has_merge implies non-NULL branch->remote_name
 340                          */
 341                         if (has_merge &&
 342                             !strcmp(branch->remote_name, remote->name))
 343                                 add_merge_config(&ref_map, remote_refs, branch, &tail);
 344                 } else {
 345                         ref_map = get_remote_ref(remote_refs, "HEAD");
 346                         if (!ref_map)
 347                                 die(_("Couldn't find remote ref HEAD"));
 348                         ref_map->fetch_head_status = FETCH_HEAD_MERGE;
 349                         tail = &ref_map->next;
 350                 }
 351         }
 352
 353         if (tags == TAGS_SET)
 354                 /* also fetch all tags */
 355                 get_fetch_map(remote_refs, tag_refspec, &tail, 0);
 356         else if (tags == TAGS_DEFAULT && *autotags)
 357                 find_non_local_tags(transport, &ref_map, &tail);
 358
 359         /* Now append any refs to be updated opportunistically: */
 360         *tail = orefs;
 361         for (rm = orefs; rm; rm = rm->next) {
 362                 rm->fetch_head_status = FETCH_HEAD_IGNORE;
 363                 tail = &rm->next;
 364         }
 365
 366         return ref_remove_duplicates(ref_map);
 367 }
 368
 369 #define STORE_REF_ERROR_OTHER 1
 370 #define STORE_REF_ERROR_DF_CONFLICT 2
 371
 372 static int s_update_ref(const char *action,
 373                         struct ref *ref,
 374                         int check_old)
 375 {
 376         char msg[1024];
 377         char *rla = getenv("GIT_REFLOG_ACTION");
 378         static struct ref_lock *lock;
 379
 380         if (dry_run)
 381                 return 0;
 382         if (!rla)
 383                 rla = default_rla.buf;
 384         snprintf(msg, sizeof(msg), "%s: %s", rla, action);
 385         lock = lock_any_ref_for_update(ref->name,
 386                                        check_old ? ref->old_sha1 : NULL,
 387                                        0, NULL);
 388         if (!lock)
 389                 return errno == ENOTDIR ? STORE_REF_ERROR_DF_CONFLICT :
 390                                           STORE_REF_ERROR_OTHER;
 391         if (write_ref_sha1(lock, ref->new_sha1, msg) < 0)
 392                 return errno == ENOTDIR ? STORE_REF_ERROR_DF_CONFLICT :
 393                                           STORE_REF_ERROR_OTHER;
 394         return 0;
 395 }
 396
 397 #define REFCOL_WIDTH  10
 398
 399 static int update_local_ref(struct ref *ref,
 400                             const char *remote,
 401                             const struct ref *remote_ref,
 402                             struct strbuf *display)
 403 {
 404         struct commit *current = NULL, *updated;
 405         enum object_type type;
 406         struct branch *current_branch = branch_get(NULL);
 407         const char *pretty_ref = prettify_refname(ref->name);
 408
 409         type = sha1_object_info(ref->new_sha1, NULL);
 410         if (type < 0)
 411                 die(_("object %s not found"), sha1_to_hex(ref->new_sha1));
 412
 413         if (!hashcmp(ref->old_sha1, ref->new_sha1)) {
 414                 if (verbosity > 0)
 415                         strbuf_addf(display, "= %-*s %-*s -> %s",
 416                                     TRANSPORT_SUMMARY(_("[up to date]")),
 417                                     REFCOL_WIDTH, remote, pretty_ref);
 418                 return 0;
 419         }
 420
 421         if (current_branch &&
 422             !strcmp(ref->name, current_branch->name) &&
 423             !(update_head_ok || is_bare_repository()) &&
 424             !is_null_sha1(ref->old_sha1)) {
 425                 /*
 426                  * If this is the head, and it's not okay to update
 427                  * the head, and the old value of the head isn't empty...
 428                  */
 429                 strbuf_addf(display,
 430                             _("! %-*s %-*s -> %s  (can't fetch in current branch)"),
 431                             TRANSPORT_SUMMARY(_("[rejected]")),
 432                             REFCOL_WIDTH, remote, pretty_ref);
 433                 return 1;
 434         }
 435
 436         if (!is_null_sha1(ref->old_sha1) &&
 437             starts_with(ref->name, "refs/tags/")) {
 438                 int r;
 439                 r = s_update_ref("updating tag", ref, 0);
 440                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 441                             r ? '!' : '-',
 442                             TRANSPORT_SUMMARY(_("[tag update]")),
 443                             REFCOL_WIDTH, remote, pretty_ref,
 444                             r ? _("  (unable to update local ref)") : "");
 445                 return r;
 446         }
 447
 448         current = lookup_commit_reference_gently(ref->old_sha1, 1);
 449         updated = lookup_commit_reference_gently(ref->new_sha1, 1);
 450         if (!current || !updated) {
 451                 const char *msg;
 452                 const char *what;
 453                 int r;
 454                 /*
 455                  * Nicely describe the new ref we're fetching.
 456                  * Base this on the remote's ref name, as it's
 457                  * more likely to follow a standard layout.
 458                  */
 459                 const char *name = remote_ref ? remote_ref->name : "";
 460                 if (starts_with(name, "refs/tags/")) {
 461                         msg = "storing tag";
 462                         what = _("[new tag]");
 463                 } else if (starts_with(name, "refs/heads/")) {
 464                         msg = "storing head";
 465                         what = _("[new branch]");
 466                 } else {
 467                         msg = "storing ref";
 468                         what = _("[new ref]");
 469                 }
 470
 471                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 472                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 473                         check_for_new_submodule_commits(ref->new_sha1);
 474                 r = s_update_ref(msg, ref, 0);
 475                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 476                             r ? '!' : '*',
 477                             TRANSPORT_SUMMARY(what),
 478                             REFCOL_WIDTH, remote, pretty_ref,
 479                             r ? _("  (unable to update local ref)") : "");
 480                 return r;
 481         }
 482
 483         if (in_merge_bases(current, updated)) {
 484                 char quickref[83];
 485                 int r;
 486                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 487                 strcat(quickref, "..");
 488                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 489                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 490                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 491                         check_for_new_submodule_commits(ref->new_sha1);
 492                 r = s_update_ref("fast-forward", ref, 1);
 493                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 494                             r ? '!' : ' ',
 495                             TRANSPORT_SUMMARY_WIDTH, quickref,
 496                             REFCOL_WIDTH, remote, pretty_ref,
 497                             r ? _("  (unable to update local ref)") : "");
 498                 return r;
 499         } else if (force || ref->force) {
 500                 char quickref[84];
 501                 int r;
 502                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 503                 strcat(quickref, "...");
 504                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 505                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 506                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 507                         check_for_new_submodule_commits(ref->new_sha1);
 508                 r = s_update_ref("forced-update", ref, 1);
 509                 strbuf_addf(display, "%c %-*s %-*s -> %s  (%s)",
 510                             r ? '!' : '+',
 511                             TRANSPORT_SUMMARY_WIDTH, quickref,
 512                             REFCOL_WIDTH, remote, pretty_ref,
 513                             r ? _("unable to update local ref") : _("forced update"));
 514                 return r;
 515         } else {
 516                 strbuf_addf(display, "! %-*s %-*s -> %s  %s",
 517                             TRANSPORT_SUMMARY(_("[rejected]")),
 518                             REFCOL_WIDTH, remote, pretty_ref,
 519                             _("(non-fast-forward)"));
 520                 return 1;
 521         }
 522 }
 523
 524 static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
 525 {
 526         struct ref **rm = cb_data;
 527         struct ref *ref = *rm;
 528
 529         while (ref && ref->status == REF_STATUS_REJECT_SHALLOW)
 530                 ref = ref->next;
 531         if (!ref)
 532                 return -1; /* end of the list */
 533         *rm = ref->next;
 534         hashcpy(sha1, ref->old_sha1);
 535         return 0;
 536 }
 537
 538 static int store_updated_refs(const char *raw_url, const char *remote_name,
 539                 struct ref *ref_map)
 540 {
 541         FILE *fp;
 542         struct commit *commit;
 543         int url_len, i, rc = 0;
 544         struct strbuf note = STRBUF_INIT;
 545         const char *what, *kind;
 546         struct ref *rm;
 547         char *url, *filename = dry_run ? "/dev/null" : git_path("FETCH_HEAD");
 548         int want_status;
 549
 550         fp = fopen(filename, "a");
 551         if (!fp)
 552                 return error(_("cannot open %s: %s\n"), filename, strerror(errno));
 553
 554         if (raw_url)
 555                 url = transport_anonymize_url(raw_url);
 556         else
 557                 url = xstrdup("foreign");
 558
 559         rm = ref_map;
 560         if (check_everything_connected(iterate_ref_map, 0, &rm)) {
 561                 rc = error(_("%s did not send all necessary objects\n"), url);
 562                 goto abort;
 563         }
 564
 565         /*
 566          * We do a pass for each fetch_head_status type in their enum order, so
 567          * merged entries are written before not-for-merge. That lets readers
 568          * use FETCH_HEAD as a refname to refer to the ref to be merged.
 569          */
 570         for (want_status = FETCH_HEAD_MERGE;
 571              want_status <= FETCH_HEAD_IGNORE;
 572              want_status++) {
 573                 for (rm = ref_map; rm; rm = rm->next) {
 574                         struct ref *ref = NULL;
 575                         const char *merge_status_marker = "";
 576
 577                         if (rm->status == REF_STATUS_REJECT_SHALLOW) {
 578                                 if (want_status == FETCH_HEAD_MERGE)
 579                                         warning(_("reject %s because shallow roots are not allowed to be updated"),
 580                                                 rm->peer_ref ? rm->peer_ref->name : rm->name);
 581                                 continue;
 582                         }
 583
 584                         commit = lookup_commit_reference_gently(rm->old_sha1, 1);
 585                         if (!commit)
 586                                 rm->fetch_head_status = FETCH_HEAD_NOT_FOR_MERGE;
 587
 588                         if (rm->fetch_head_status != want_status)
 589                                 continue;
 590
 591                         if (rm->peer_ref) {
 592                                 ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
 593                                 strcpy(ref->name, rm->peer_ref->name);
 594                                 hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
 595                                 hashcpy(ref->new_sha1, rm->old_sha1);
 596                                 ref->force = rm->peer_ref->force;
 597                         }
 598
 599
 600                         if (!strcmp(rm->name, "HEAD")) {
 601                                 kind = "";
 602                                 what = "";
 603                         }
 604                         else if (starts_with(rm->name, "refs/heads/")) {
 605                                 kind = "branch";
 606                                 what = rm->name + 11;
 607                         }
 608                         else if (starts_with(rm->name, "refs/tags/")) {
 609                                 kind = "tag";
 610                                 what = rm->name + 10;
 611                         }
 612                         else if (starts_with(rm->name, "refs/remotes/")) {
 613                                 kind = "remote-tracking branch";
 614                                 what = rm->name + 13;
 615                         }
 616                         else {
 617                                 kind = "";
 618                                 what = rm->name;
 619                         }
 620
 621                         url_len = strlen(url);
 622                         for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 623                                 ;
 624                         url_len = i + 1;
 625                         if (4 < i && !strncmp(".git", url + i - 3, 4))
 626                                 url_len = i - 3;
 627
 628                         strbuf_reset(&note);
 629                         if (*what) {
 630                                 if (*kind)
 631                                         strbuf_addf(&note, "%s ", kind);
 632                                 strbuf_addf(&note, "'%s' of ", what);
 633                         }
 634                         switch (rm->fetch_head_status) {
 635                         case FETCH_HEAD_NOT_FOR_MERGE:
 636                                 merge_status_marker = "not-for-merge";
 637                                 /* fall-through */
 638                         case FETCH_HEAD_MERGE:
 639                                 fprintf(fp, "%s\t%s\t%s",
 640                                         sha1_to_hex(rm->old_sha1),
 641                                         merge_status_marker,
 642                                         note.buf);
 643                                 for (i = 0; i < url_len; ++i)
 644                                         if ('\n' == url[i])
 645                                                 fputs("\\n", fp);
 646                                         else
 647                                                 fputc(url[i], fp);
 648                                 fputc('\n', fp);
 649                                 break;
 650                         default:
 651                                 /* do not write anything to FETCH_HEAD */
 652                                 break;
 653                         }
 654
 655                         strbuf_reset(&note);
 656                         if (ref) {
 657                                 rc |= update_local_ref(ref, what, rm, &note);
 658                                 free(ref);
 659                         } else
 660                                 strbuf_addf(&note, "* %-*s %-*s -> FETCH_HEAD",
 661                                             TRANSPORT_SUMMARY_WIDTH,
 662                                             *kind ? kind : "branch",
 663                                             REFCOL_WIDTH,
 664                                             *what ? what : "HEAD");
 665                         if (note.len) {
 666                                 if (verbosity >= 0 && !shown_url) {
 667                                         fprintf(stderr, _("From %.*s\n"),
 668                                                         url_len, url);
 669                                         shown_url = 1;
 670                                 }
 671                                 if (verbosity >= 0)
 672                                         fprintf(stderr, " %s\n", note.buf);
 673                         }
 674                 }
 675         }
 676
 677         if (rc & STORE_REF_ERROR_DF_CONFLICT)
 678                 error(_("some local refs could not be updated; try running\n"
 679                       " 'git remote prune %s' to remove any old, conflicting "
 680                       "branches"), remote_name);
 681
 682  abort:
 683         strbuf_release(&note);
 684         free(url);
 685         fclose(fp);
 686         return rc;
 687 }
 688
 689 /*
 690  * We would want to bypass the object transfer altogether if
 691  * everything we are going to fetch already exists and is connected
 692  * locally.
 693  */
 694 static int quickfetch(struct ref *ref_map)
 695 {
 696         struct ref *rm = ref_map;
 697
 698         /*
 699          * If we are deepening a shallow clone we already have these
 700          * objects reachable.  Running rev-list here will return with
 701          * a good (0) exit status and we'll bypass the fetch that we
 702          * really need to perform.  Claiming failure now will ensure
 703          * we perform the network exchange to deepen our history.
 704          */
 705         if (depth)
 706                 return -1;
 707         return check_everything_connected(iterate_ref_map, 1, &rm);
 708 }
 709
 710 static int fetch_refs(struct transport *transport, struct ref *ref_map)
 711 {
 712         int ret = quickfetch(ref_map);
 713         if (ret)
 714                 ret = transport_fetch_refs(transport, ref_map);
 715         if (!ret)
 716                 ret |= store_updated_refs(transport->url,
 717                                 transport->remote->name,
 718                                 ref_map);
 719         transport_unlock_pack(transport);
 720         return ret;
 721 }
 722
 723 static int prune_refs(struct refspec *refs, int ref_count, struct ref *ref_map,
 724                 const char *raw_url)
 725 {
 726         int url_len, i, result = 0;
 727         struct ref *ref, *stale_refs = get_stale_heads(refs, ref_count, ref_map);
 728         char *url;
 729         const char *dangling_msg = dry_run
 730                 ? _("   (%s will become dangling)")
 731                 : _("   (%s has become dangling)");
 732
 733         if (raw_url)
 734                 url = transport_anonymize_url(raw_url);
 735         else
 736                 url = xstrdup("foreign");
 737
 738         url_len = strlen(url);
 739         for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 740                 ;
 741
 742         url_len = i + 1;
 743         if (4 < i && !strncmp(".git", url + i - 3, 4))
 744                 url_len = i - 3;
 745
 746         for (ref = stale_refs; ref; ref = ref->next) {
 747                 if (!dry_run)
 748                         result |= delete_ref(ref->name, NULL, 0);
 749                 if (verbosity >= 0 && !shown_url) {
 750                         fprintf(stderr, _("From %.*s\n"), url_len, url);
 751                         shown_url = 1;
 752                 }
 753                 if (verbosity >= 0) {
 754                         fprintf(stderr, " x %-*s %-*s -> %s\n",
 755                                 TRANSPORT_SUMMARY(_("[deleted]")),
 756                                 REFCOL_WIDTH, _("(none)"), prettify_refname(ref->name));
 757                         warn_dangling_symref(stderr, dangling_msg, ref->name);
 758                 }
 759         }
 760         free(url);
 761         free_refs(stale_refs);
 762         return result;
 763 }
 764
 765 static void check_not_current_branch(struct ref *ref_map)
 766 {
 767         struct branch *current_branch = branch_get(NULL);
 768
 769         if (is_bare_repository() || !current_branch)
 770                 return;
 771
 772         for (; ref_map; ref_map = ref_map->next)
 773                 if (ref_map->peer_ref && !strcmp(current_branch->refname,
 774                                         ref_map->peer_ref->name))
 775                         die(_("Refusing to fetch into current branch %s "
 776                             "of non-bare repository"), current_branch->refname);
 777 }
 778
 779 static int truncate_fetch_head(void)
 780 {
 781         char *filename = git_path("FETCH_HEAD");
 782         FILE *fp = fopen(filename, "w");
 783
 784         if (!fp)
 785                 return error(_("cannot open %s: %s\n"), filename, strerror(errno));
 786         fclose(fp);
 787         return 0;
 788 }
 789
 790 static void set_option(struct transport *transport, const char *name, const char *value)
 791 {
 792         int r = transport_set_option(transport, name, value);
 793         if (r < 0)
 794                 die(_("Option \"%s\" value \"%s\" is not valid for %s"),
 795                     name, value, transport->url);
 796         if (r > 0)
 797                 warning(_("Option \"%s\" is ignored for %s\n"),
 798                         name, transport->url);
 799 }
 800
 801 static struct transport *prepare_transport(struct remote *remote)
 802 {
 803         struct transport *transport;
 804         transport = transport_get(remote, NULL);
 805         transport_set_verbosity(transport, verbosity, progress);
 806         if (upload_pack)
 807                 set_option(transport, TRANS_OPT_UPLOADPACK, upload_pack);
 808         if (keep)
 809                 set_option(transport, TRANS_OPT_KEEP, "yes");
 810         if (depth)
 811                 set_option(transport, TRANS_OPT_DEPTH, depth);
 812         if (update_shallow)
 813                 set_option(transport, TRANS_OPT_UPDATE_SHALLOW, "yes");
 814         return transport;
 815 }
 816
 817 static void backfill_tags(struct transport *transport, struct ref *ref_map)
 818 {
 819         if (transport->cannot_reuse) {
 820                 gsecondary = prepare_transport(transport->remote);
 821                 transport = gsecondary;
 822         }
 823
 824         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
 825         transport_set_option(transport, TRANS_OPT_DEPTH, "0");
 826         fetch_refs(transport, ref_map);
 827
 828         if (gsecondary) {
 829                 transport_disconnect(gsecondary);
 830                 gsecondary = NULL;
 831         }
 832 }
 833
 834 static int do_fetch(struct transport *transport,
 835                     struct refspec *refs, int ref_count)
 836 {
 837         struct string_list existing_refs = STRING_LIST_INIT_DUP;
 838         struct ref *ref_map;
 839         struct ref *rm;
 840         int autotags = (transport->remote->fetch_tags == 1);
 841         int retcode = 0;
 842
 843         for_each_ref(add_existing, &existing_refs);
 844
 845         if (tags == TAGS_DEFAULT) {
 846                 if (transport->remote->fetch_tags == 2)
 847                         tags = TAGS_SET;
 848                 if (transport->remote->fetch_tags == -1)
 849                         tags = TAGS_UNSET;
 850         }
 851
 852         if (!transport->get_refs_list || !transport->fetch)
 853                 die(_("Don't know how to fetch from %s"), transport->url);
 854
 855         /* if not appending, truncate FETCH_HEAD */
 856         if (!append && !dry_run) {
 857                 retcode = truncate_fetch_head();
 858                 if (retcode)
 859                         goto cleanup;
 860         }
 861
 862         ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
 863         if (!update_head_ok)
 864                 check_not_current_branch(ref_map);
 865
 866         for (rm = ref_map; rm; rm = rm->next) {
 867                 if (rm->peer_ref) {
 868                         struct string_list_item *peer_item =
 869                                 string_list_lookup(&existing_refs,
 870                                                    rm->peer_ref->name);
 871                         if (peer_item)
 872                                 hashcpy(rm->peer_ref->old_sha1,
 873                                         peer_item->util);
 874                 }
 875         }
 876
 877         if (tags == TAGS_DEFAULT && autotags)
 878                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
 879         if (prune) {
 880                 /*
 881                  * We only prune based on refspecs specified
 882                  * explicitly (via command line or configuration); we
 883                  * don't care whether --tags was specified.
 884                  */
 885                 if (ref_count) {
 886                         prune_refs(refs, ref_count, ref_map, transport->url);
 887                 } else {
 888                         prune_refs(transport->remote->fetch,
 889                                    transport->remote->fetch_refspec_nr,
 890                                    ref_map,
 891                                    transport->url);
 892                 }
 893         }
 894         if (fetch_refs(transport, ref_map)) {
 895                 free_refs(ref_map);
 896                 retcode = 1;
 897                 goto cleanup;
 898         }
 899         free_refs(ref_map);
 900
 901         /* if neither --no-tags nor --tags was specified, do automated tag
 902          * following ... */
 903         if (tags == TAGS_DEFAULT && autotags) {
 904                 struct ref **tail = &ref_map;
 905                 ref_map = NULL;
 906                 find_non_local_tags(transport, &ref_map, &tail);
 907                 if (ref_map)
 908                         backfill_tags(transport, ref_map);
 909                 free_refs(ref_map);
 910         }
 911
 912  cleanup:
 913         string_list_clear(&existing_refs, 1);
 914         return retcode;
 915 }
 916
 917 static int get_one_remote_for_fetch(struct remote *remote, void *priv)
 918 {
 919         struct string_list *list = priv;
 920         if (!remote->skip_default_update)
 921                 string_list_append(list, remote->name);
 922         return 0;
 923 }
 924
 925 struct remote_group_data {
 926         const char *name;
 927         struct string_list *list;
 928 };
 929
 930 static int get_remote_group(const char *key, const char *value, void *priv)
 931 {
 932         struct remote_group_data *g = priv;
 933
 934         if (starts_with(key, "remotes.") &&
 935                         !strcmp(key + 8, g->name)) {
 936                 /* split list by white space */
 937                 int space = strcspn(value, " \t\n");
 938                 while (*value) {
 939                         if (space > 1) {
 940                                 string_list_append(g->list,
 941                                                    xstrndup(value, space));
 942                         }
 943                         value += space + (value[space] != '\0');
 944                         space = strcspn(value, " \t\n");
 945                 }
 946         }
 947
 948         return 0;
 949 }
 950
 951 static int add_remote_or_group(const char *name, struct string_list *list)
 952 {
 953         int prev_nr = list->nr;
 954         struct remote_group_data g;
 955         g.name = name; g.list = list;
 956
 957         git_config(get_remote_group, &g);
 958         if (list->nr == prev_nr) {
 959                 struct remote *remote;
 960                 if (!remote_is_configured(name))
 961                         return 0;
 962                 remote = remote_get(name);
 963                 string_list_append(list, remote->name);
 964         }
 965         return 1;
 966 }
 967
 968 static void add_options_to_argv(struct argv_array *argv)
 969 {
 970         if (dry_run)
 971                 argv_array_push(argv, "--dry-run");
 972         if (prune != -1)
 973                 argv_array_push(argv, prune ? "--prune" : "--no-prune");
 974         if (update_head_ok)
 975                 argv_array_push(argv, "--update-head-ok");
 976         if (force)
 977                 argv_array_push(argv, "--force");
 978         if (keep)
 979                 argv_array_push(argv, "--keep");
 980         if (recurse_submodules == RECURSE_SUBMODULES_ON)
 981                 argv_array_push(argv, "--recurse-submodules");
 982         else if (recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND)
 983                 argv_array_push(argv, "--recurse-submodules=on-demand");
 984         if (tags == TAGS_SET)
 985                 argv_array_push(argv, "--tags");
 986         else if (tags == TAGS_UNSET)
 987                 argv_array_push(argv, "--no-tags");
 988         if (verbosity >= 2)
 989                 argv_array_push(argv, "-v");
 990         if (verbosity >= 1)
 991                 argv_array_push(argv, "-v");
 992         else if (verbosity < 0)
 993                 argv_array_push(argv, "-q");
 994
 995 }
 996
 997 static int fetch_multiple(struct string_list *list)
 998 {
 999         int i, result = 0;
1000         struct argv_array argv = ARGV_ARRAY_INIT;
1001
1002         if (!append && !dry_run) {
1003                 int errcode = truncate_fetch_head();
1004                 if (errcode)
1005                         return errcode;
1006         }
1007
1008         argv_array_pushl(&argv, "fetch", "--append", NULL);
1009         add_options_to_argv(&argv);
1010
1011         for (i = 0; i < list->nr; i++) {
1012                 const char *name = list->items[i].string;
1013                 argv_array_push(&argv, name);
1014                 if (verbosity >= 0)
1015                         printf(_("Fetching %s\n"), name);
1016                 if (run_command_v_opt(argv.argv, RUN_GIT_CMD)) {
1017                         error(_("Could not fetch %s"), name);
1018                         result = 1;
1019                 }
1020                 argv_array_pop(&argv);
1021         }
1022
1023         argv_array_clear(&argv);
1024         return result;
1025 }
1026
1027 static int fetch_one(struct remote *remote, int argc, const char **argv)
1028 {
1029         static const char **refs = NULL;
1030         struct refspec *refspec;
1031         int ref_nr = 0;
1032         int exit_code;
1033
1034         if (!remote)
1035                 die(_("No remote repository specified.  Please, specify either a URL or a\n"
1036                     "remote name from which new revisions should be fetched."));
1037
1038         gtransport = prepare_transport(remote);
1039
1040         if (prune < 0) {
1041                 /* no command line request */
1042                 if (0 <= gtransport->remote->prune)
1043                         prune = gtransport->remote->prune;
1044                 else if (0 <= fetch_prune_config)
1045                         prune = fetch_prune_config;
1046                 else
1047                         prune = PRUNE_BY_DEFAULT;
1048         }
1049
1050         if (argc > 0) {
1051                 int j = 0;
1052                 int i;
1053                 refs = xcalloc(argc + 1, sizeof(const char *));
1054                 for (i = 0; i < argc; i++) {
1055                         if (!strcmp(argv[i], "tag")) {
1056                                 char *ref;
1057                                 i++;
1058                                 if (i >= argc)
1059                                         die(_("You need to specify a tag name."));
1060                                 ref = xmalloc(strlen(argv[i]) * 2 + 22);
1061                                 strcpy(ref, "refs/tags/");
1062                                 strcat(ref, argv[i]);
1063                                 strcat(ref, ":refs/tags/");
1064                                 strcat(ref, argv[i]);
1065                                 refs[j++] = ref;
1066                         } else
1067                                 refs[j++] = argv[i];
1068                 }
1069                 refs[j] = NULL;
1070                 ref_nr = j;
1071         }
1072
1073         sigchain_push_common(unlock_pack_on_signal);
1074         atexit(unlock_pack);
1075         refspec = parse_fetch_refspec(ref_nr, refs);
1076         exit_code = do_fetch(gtransport, refspec, ref_nr);
1077         free_refspec(ref_nr, refspec);
1078         transport_disconnect(gtransport);
1079         gtransport = NULL;
1080         return exit_code;
1081 }
1082
1083 int cmd_fetch(int argc, const char **argv, const char *prefix)
1084 {
1085         int i;
1086         struct string_list list = STRING_LIST_INIT_NODUP;
1087         struct remote *remote;
1088         int result = 0;
1089         static const char *argv_gc_auto[] = {
1090                 "gc", "--auto", NULL,
1091         };
1092
1093         packet_trace_identity("fetch");
1094
1095         /* Record the command line for the reflog */
1096         strbuf_addstr(&default_rla, "fetch");
1097         for (i = 1; i < argc; i++)
1098                 strbuf_addf(&default_rla, " %s", argv[i]);
1099
1100         git_config(git_fetch_config, NULL);
1101
1102         argc = parse_options(argc, argv, prefix,
1103                              builtin_fetch_options, builtin_fetch_usage, 0);
1104
1105         if (unshallow) {
1106                 if (depth)
1107                         die(_("--depth and --unshallow cannot be used together"));
1108                 else if (!is_repository_shallow())
1109                         die(_("--unshallow on a complete repository does not make sense"));
1110                 else {
1111                         static char inf_depth[12];
1112                         sprintf(inf_depth, "%d", INFINITE_DEPTH);
1113                         depth = inf_depth;
1114                 }
1115         }
1116
1117         /* no need to be strict, transport_set_option() will validate it again */
1118         if (depth && atoi(depth) < 1)
1119                 die(_("depth %s is not a positive number"), depth);
1120
1121         if (recurse_submodules != RECURSE_SUBMODULES_OFF) {
1122                 if (recurse_submodules_default) {
1123                         int arg = parse_fetch_recurse_submodules_arg("--recurse-submodules-default", recurse_submodules_default);
1124                         set_config_fetch_recurse_submodules(arg);
1125                 }
1126                 gitmodules_config();
1127                 git_config(submodule_config, NULL);
1128         }
1129
1130         if (all) {
1131                 if (argc == 1)
1132                         die(_("fetch --all does not take a repository argument"));
1133                 else if (argc > 1)
1134                         die(_("fetch --all does not make sense with refspecs"));
1135                 (void) for_each_remote(get_one_remote_for_fetch, &list);
1136                 result = fetch_multiple(&list);
1137         } else if (argc == 0) {
1138                 /* No arguments -- use default remote */
1139                 remote = remote_get(NULL);
1140                 result = fetch_one(remote, argc, argv);
1141         } else if (multiple) {
1142                 /* All arguments are assumed to be remotes or groups */
1143                 for (i = 0; i < argc; i++)
1144                         if (!add_remote_or_group(argv[i], &list))
1145                                 die(_("No such remote or remote group: %s"), argv[i]);
1146                 result = fetch_multiple(&list);
1147         } else {
1148                 /* Single remote or group */
1149                 (void) add_remote_or_group(argv[0], &list);
1150                 if (list.nr > 1) {
1151                         /* More than one remote */
1152                         if (argc > 1)
1153                                 die(_("Fetching a group and specifying refspecs does not make sense"));
1154                         result = fetch_multiple(&list);
1155                 } else {
1156                         /* Zero or one remotes */
1157                         remote = remote_get(argv[0]);
1158                         result = fetch_one(remote, argc-1, argv+1);
1159                 }
1160         }
1161
1162         if (!result && (recurse_submodules != RECURSE_SUBMODULES_OFF)) {
1163                 struct argv_array options = ARGV_ARRAY_INIT;
1164
1165                 add_options_to_argv(&options);
1166                 result = fetch_populated_submodules(&options,
1167                                                     submodule_prefix,
1168                                                     recurse_submodules,
1169                                                     verbosity < 0);
1170                 argv_array_clear(&options);
1171         }
1172
1173         /* All names were strdup()ed or strndup()ed */
1174         list.strdup_strings = 1;
1175         string_list_clear(&list, 0);
1176
1177         run_command_v_opt(argv_gc_auto, RUN_GIT_CMD);
1178
1179         return result;
1180 }