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