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