builtin/fetch.c

   1 /*
   2  * "git fetch"
   3  */
   4 #include "cache.h"
   5 #include "refs.h"
   6 #include "commit.h"
   7 #include "builtin.h"
   8 #include "string-list.h"
   9 #include "remote.h"
  10 #include "transport.h"
  11 #include "run-command.h"
  12 #include "parse-options.h"
  13 #include "sigchain.h"
  14 #include "submodule-config.h"
  15 #include "submodule.h"
  16 #include "connected.h"
  17 #include "argv-array.h"
  18
  19 static const char * const builtin_fetch_usage[] = {
  20         N_("git fetch [<options>] [<repository> [<refspec>...]]"),
  21         N_("git fetch [<options>] <group>"),
  22         N_("git fetch --multiple [<options>] [(<repository> | <group>)...]"),
  23         N_("git fetch --all [<options>]"),
  24         NULL
  25 };
  26
  27 enum {
  28         TAGS_UNSET = 0,
  29         TAGS_DEFAULT = 1,
  30         TAGS_SET = 2
  31 };
  32
  33 static int fetch_prune_config = -1; /* unspecified */
  34 static int prune = -1; /* unspecified */
  35 #define PRUNE_BY_DEFAULT 0 /* do we prune by default? */
  36
  37 static int all, append, dry_run, force, keep, multiple, update_head_ok, verbosity;
  38 static int progress = -1, recurse_submodules = RECURSE_SUBMODULES_DEFAULT;
  39 static int tags = TAGS_DEFAULT, unshallow, update_shallow;
  40 static int max_children = -1;
  41 static enum transport_family family;
  42 static const char *depth;
  43 static const char *upload_pack;
  44 static struct strbuf default_rla = STRBUF_INIT;
  45 static struct transport *gtransport;
  46 static struct transport *gsecondary;
  47 static const char *submodule_prefix = "";
  48 static const char *recurse_submodules_default;
  49 static int shown_url = 0;
  50 static int refmap_alloc, refmap_nr;
  51 static const char **refmap_array;
  52
  53 static int option_parse_recurse_submodules(const struct option *opt,
  54                                    const char *arg, int unset)
  55 {
  56         if (unset) {
  57                 recurse_submodules = RECURSE_SUBMODULES_OFF;
  58         } else {
  59                 if (arg)
  60                         recurse_submodules = parse_fetch_recurse_submodules_arg(opt->long_name, arg);
  61                 else
  62                         recurse_submodules = RECURSE_SUBMODULES_ON;
  63         }
  64         return 0;
  65 }
  66
  67 static int git_fetch_config(const char *k, const char *v, void *cb)
  68 {
  69         if (!strcmp(k, "fetch.prune")) {
  70                 fetch_prune_config = git_config_bool(k, v);
  71                 return 0;
  72         }
  73         return git_default_config(k, v, cb);
  74 }
  75
  76 static int parse_refmap_arg(const struct option *opt, const char *arg, int unset)
  77 {
  78         ALLOC_GROW(refmap_array, refmap_nr + 1, refmap_alloc);
  79
  80         /*
  81          * "git fetch --refmap='' origin foo"
  82          * can be used to tell the command not to store anywhere
  83          */
  84         if (*arg)
  85                 refmap_array[refmap_nr++] = arg;
  86         return 0;
  87 }
  88
  89 static struct option builtin_fetch_options[] = {
  90         OPT__VERBOSITY(&verbosity),
  91         OPT_BOOL(0, "all", &all,
  92                  N_("fetch from all remotes")),
  93         OPT_BOOL('a', "append", &append,
  94                  N_("append to .git/FETCH_HEAD instead of overwriting")),
  95         OPT_STRING(0, "upload-pack", &upload_pack, N_("path"),
  96                    N_("path to upload pack on remote end")),
  97         OPT__FORCE(&force, N_("force overwrite of local branch")),
  98         OPT_BOOL('m', "multiple", &multiple,
  99                  N_("fetch from multiple remotes")),
 100         OPT_SET_INT('t', "tags", &tags,
 101                     N_("fetch all tags and associated objects"), TAGS_SET),
 102         OPT_SET_INT('n', NULL, &tags,
 103                     N_("do not fetch all tags (--no-tags)"), TAGS_UNSET),
 104         OPT_INTEGER('j', "jobs", &max_children,
 105                     N_("number of submodules fetched in parallel")),
 106         OPT_BOOL('p', "prune", &prune,
 107                  N_("prune remote-tracking branches no longer on remote")),
 108         { OPTION_CALLBACK, 0, "recurse-submodules", NULL, N_("on-demand"),
 109                     N_("control recursive fetching of submodules"),
 110                     PARSE_OPT_OPTARG, option_parse_recurse_submodules },
 111         OPT_BOOL(0, "dry-run", &dry_run,
 112                  N_("dry run")),
 113         OPT_BOOL('k', "keep", &keep, N_("keep downloaded pack")),
 114         OPT_BOOL('u', "update-head-ok", &update_head_ok,
 115                     N_("allow updating of HEAD ref")),
 116         OPT_BOOL(0, "progress", &progress, N_("force progress reporting")),
 117         OPT_STRING(0, "depth", &depth, N_("depth"),
 118                    N_("deepen history of shallow clone")),
 119         { OPTION_SET_INT, 0, "unshallow", &unshallow, NULL,
 120                    N_("convert to a complete repository"),
 121                    PARSE_OPT_NONEG | PARSE_OPT_NOARG, NULL, 1 },
 122         { OPTION_STRING, 0, "submodule-prefix", &submodule_prefix, N_("dir"),
 123                    N_("prepend this to submodule path output"), PARSE_OPT_HIDDEN },
 124         { OPTION_STRING, 0, "recurse-submodules-default",
 125                    &recurse_submodules_default, NULL,
 126                    N_("default mode for recursion"), PARSE_OPT_HIDDEN },
 127         OPT_BOOL(0, "update-shallow", &update_shallow,
 128                  N_("accept refs that update .git/shallow")),
 129         { OPTION_CALLBACK, 0, "refmap", NULL, N_("refmap"),
 130           N_("specify fetch refmap"), PARSE_OPT_NONEG, parse_refmap_arg },
 131         OPT_SET_INT('4', "ipv4", &family, N_("use IPv4 addresses only"),
 132                         TRANSPORT_FAMILY_IPV4),
 133         OPT_SET_INT('6', "ipv6", &family, N_("use IPv6 addresses only"),
 134                         TRANSPORT_FAMILY_IPV6),
 135         OPT_END()
 136 };
 137
 138 static void unlock_pack(void)
 139 {
 140         if (gtransport)
 141                 transport_unlock_pack(gtransport);
 142         if (gsecondary)
 143                 transport_unlock_pack(gsecondary);
 144 }
 145
 146 static void unlock_pack_on_signal(int signo)
 147 {
 148         unlock_pack();
 149         sigchain_pop(signo);
 150         raise(signo);
 151 }
 152
 153 static void add_merge_config(struct ref **head,
 154                            const struct ref *remote_refs,
 155                            struct branch *branch,
 156                            struct ref ***tail)
 157 {
 158         int i;
 159
 160         for (i = 0; i < branch->merge_nr; i++) {
 161                 struct ref *rm, **old_tail = *tail;
 162                 struct refspec refspec;
 163
 164                 for (rm = *head; rm; rm = rm->next) {
 165                         if (branch_merge_matches(branch, i, rm->name)) {
 166                                 rm->fetch_head_status = FETCH_HEAD_MERGE;
 167                                 break;
 168                         }
 169                 }
 170                 if (rm)
 171                         continue;
 172
 173                 /*
 174                  * Not fetched to a remote-tracking branch?  We need to fetch
 175                  * it anyway to allow this branch's "branch.$name.merge"
 176                  * to be honored by 'git pull', but we do not have to
 177                  * fail if branch.$name.merge is misconfigured to point
 178                  * at a nonexisting branch.  If we were indeed called by
 179                  * 'git pull', it will notice the misconfiguration because
 180                  * there is no entry in the resulting FETCH_HEAD marked
 181                  * for merging.
 182                  */
 183                 memset(&refspec, 0, sizeof(refspec));
 184                 refspec.src = branch->merge[i]->src;
 185                 get_fetch_map(remote_refs, &refspec, tail, 1);
 186                 for (rm = *old_tail; rm; rm = rm->next)
 187                         rm->fetch_head_status = FETCH_HEAD_MERGE;
 188         }
 189 }
 190
 191 static int add_existing(const char *refname, const struct object_id *oid,
 192                         int flag, void *cbdata)
 193 {
 194         struct string_list *list = (struct string_list *)cbdata;
 195         struct string_list_item *item = string_list_insert(list, refname);
 196         struct object_id *old_oid = xmalloc(sizeof(*old_oid));
 197
 198         oidcpy(old_oid, oid);
 199         item->util = old_oid;
 200         return 0;
 201 }
 202
 203 static int will_fetch(struct ref **head, const unsigned char *sha1)
 204 {
 205         struct ref *rm = *head;
 206         while (rm) {
 207                 if (!hashcmp(rm->old_oid.hash, sha1))
 208                         return 1;
 209                 rm = rm->next;
 210         }
 211         return 0;
 212 }
 213
 214 static void find_non_local_tags(struct transport *transport,
 215                         struct ref **head,
 216                         struct ref ***tail)
 217 {
 218         struct string_list existing_refs = STRING_LIST_INIT_DUP;
 219         struct string_list remote_refs = STRING_LIST_INIT_NODUP;
 220         const struct ref *ref;
 221         struct string_list_item *item = NULL;
 222
 223         for_each_ref(add_existing, &existing_refs);
 224         for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
 225                 if (!starts_with(ref->name, "refs/tags/"))
 226                         continue;
 227
 228                 /*
 229                  * The peeled ref always follows the matching base
 230                  * ref, so if we see a peeled ref that we don't want
 231                  * to fetch then we can mark the ref entry in the list
 232                  * as one to ignore by setting util to NULL.
 233                  */
 234                 if (ends_with(ref->name, "^{}")) {
 235                         if (item && !has_object_file(&ref->old_oid) &&
 236                             !will_fetch(head, ref->old_oid.hash) &&
 237                             !has_sha1_file(item->util) &&
 238                             !will_fetch(head, item->util))
 239                                 item->util = NULL;
 240                         item = NULL;
 241                         continue;
 242                 }
 243
 244                 /*
 245                  * If item is non-NULL here, then we previously saw a
 246                  * ref not followed by a peeled reference, so we need
 247                  * to check if it is a lightweight tag that we want to
 248                  * fetch.
 249                  */
 250                 if (item && !has_sha1_file(item->util) &&
 251                     !will_fetch(head, item->util))
 252                         item->util = NULL;
 253
 254                 item = NULL;
 255
 256                 /* skip duplicates and refs that we already have */
 257                 if (string_list_has_string(&remote_refs, ref->name) ||
 258                     string_list_has_string(&existing_refs, ref->name))
 259                         continue;
 260
 261                 item = string_list_insert(&remote_refs, ref->name);
 262                 item->util = (void *)&ref->old_oid;
 263         }
 264         string_list_clear(&existing_refs, 1);
 265
 266         /*
 267          * We may have a final lightweight tag that needs to be
 268          * checked to see if it needs fetching.
 269          */
 270         if (item && !has_sha1_file(item->util) &&
 271             !will_fetch(head, item->util))
 272                 item->util = NULL;
 273
 274         /*
 275          * For all the tags in the remote_refs string list,
 276          * add them to the list of refs to be fetched
 277          */
 278         for_each_string_list_item(item, &remote_refs) {
 279                 /* Unless we have already decided to ignore this item... */
 280                 if (item->util)
 281                 {
 282                         struct ref *rm = alloc_ref(item->string);
 283                         rm->peer_ref = alloc_ref(item->string);
 284                         oidcpy(&rm->old_oid, item->util);
 285                         **tail = rm;
 286                         *tail = &rm->next;
 287                 }
 288         }
 289
 290         string_list_clear(&remote_refs, 0);
 291 }
 292
 293 static struct ref *get_ref_map(struct transport *transport,
 294                                struct refspec *refspecs, int refspec_count,
 295                                int tags, int *autotags)
 296 {
 297         int i;
 298         struct ref *rm;
 299         struct ref *ref_map = NULL;
 300         struct ref **tail = &ref_map;
 301
 302         /* opportunistically-updated references: */
 303         struct ref *orefs = NULL, **oref_tail = &orefs;
 304
 305         const struct ref *remote_refs = transport_get_remote_refs(transport);
 306
 307         if (refspec_count) {
 308                 struct refspec *fetch_refspec;
 309                 int fetch_refspec_nr;
 310
 311                 for (i = 0; i < refspec_count; i++) {
 312                         get_fetch_map(remote_refs, &refspecs[i], &tail, 0);
 313                         if (refspecs[i].dst && refspecs[i].dst[0])
 314                                 *autotags = 1;
 315                 }
 316                 /* Merge everything on the command line (but not --tags) */
 317                 for (rm = ref_map; rm; rm = rm->next)
 318                         rm->fetch_head_status = FETCH_HEAD_MERGE;
 319
 320                 /*
 321                  * For any refs that we happen to be fetching via
 322                  * command-line arguments, the destination ref might
 323                  * have been missing or have been different than the
 324                  * remote-tracking ref that would be derived from the
 325                  * configured refspec.  In these cases, we want to
 326                  * take the opportunity to update their configured
 327                  * remote-tracking reference.  However, we do not want
 328                  * to mention these entries in FETCH_HEAD at all, as
 329                  * they would simply be duplicates of existing
 330                  * entries, so we set them FETCH_HEAD_IGNORE below.
 331                  *
 332                  * We compute these entries now, based only on the
 333                  * refspecs specified on the command line.  But we add
 334                  * them to the list following the refspecs resulting
 335                  * from the tags option so that one of the latter,
 336                  * which has FETCH_HEAD_NOT_FOR_MERGE, is not removed
 337                  * by ref_remove_duplicates() in favor of one of these
 338                  * opportunistic entries with FETCH_HEAD_IGNORE.
 339                  */
 340                 if (refmap_array) {
 341                         fetch_refspec = parse_fetch_refspec(refmap_nr, refmap_array);
 342                         fetch_refspec_nr = refmap_nr;
 343                 } else {
 344                         fetch_refspec = transport->remote->fetch;
 345                         fetch_refspec_nr = transport->remote->fetch_refspec_nr;
 346                 }
 347
 348                 for (i = 0; i < fetch_refspec_nr; i++)
 349                         get_fetch_map(ref_map, &fetch_refspec[i], &oref_tail, 1);
 350
 351                 if (tags == TAGS_SET)
 352                         get_fetch_map(remote_refs, tag_refspec, &tail, 0);
 353         } else if (refmap_array) {
 354                 die("--refmap option is only meaningful with command-line refspec(s).");
 355         } else {
 356                 /* Use the defaults */
 357                 struct remote *remote = transport->remote;
 358                 struct branch *branch = branch_get(NULL);
 359                 int has_merge = branch_has_merge_config(branch);
 360                 if (remote &&
 361                     (remote->fetch_refspec_nr ||
 362                      /* Note: has_merge implies non-NULL branch->remote_name */
 363                      (has_merge && !strcmp(branch->remote_name, remote->name)))) {
 364                         for (i = 0; i < remote->fetch_refspec_nr; i++) {
 365                                 get_fetch_map(remote_refs, &remote->fetch[i], &tail, 0);
 366                                 if (remote->fetch[i].dst &&
 367                                     remote->fetch[i].dst[0])
 368                                         *autotags = 1;
 369                                 if (!i && !has_merge && ref_map &&
 370                                     !remote->fetch[0].pattern)
 371                                         ref_map->fetch_head_status = FETCH_HEAD_MERGE;
 372                         }
 373                         /*
 374                          * if the remote we're fetching from is the same
 375                          * as given in branch.<name>.remote, we add the
 376                          * ref given in branch.<name>.merge, too.
 377                          *
 378                          * Note: has_merge implies non-NULL branch->remote_name
 379                          */
 380                         if (has_merge &&
 381                             !strcmp(branch->remote_name, remote->name))
 382                                 add_merge_config(&ref_map, remote_refs, branch, &tail);
 383                 } else {
 384                         ref_map = get_remote_ref(remote_refs, "HEAD");
 385                         if (!ref_map)
 386                                 die(_("Couldn't find remote ref HEAD"));
 387                         ref_map->fetch_head_status = FETCH_HEAD_MERGE;
 388                         tail = &ref_map->next;
 389                 }
 390         }
 391
 392         if (tags == TAGS_SET)
 393                 /* also fetch all tags */
 394                 get_fetch_map(remote_refs, tag_refspec, &tail, 0);
 395         else if (tags == TAGS_DEFAULT && *autotags)
 396                 find_non_local_tags(transport, &ref_map, &tail);
 397
 398         /* Now append any refs to be updated opportunistically: */
 399         *tail = orefs;
 400         for (rm = orefs; rm; rm = rm->next) {
 401                 rm->fetch_head_status = FETCH_HEAD_IGNORE;
 402                 tail = &rm->next;
 403         }
 404
 405         return ref_remove_duplicates(ref_map);
 406 }
 407
 408 #define STORE_REF_ERROR_OTHER 1
 409 #define STORE_REF_ERROR_DF_CONFLICT 2
 410
 411 static int s_update_ref(const char *action,
 412                         struct ref *ref,
 413                         int check_old)
 414 {
 415         char msg[1024];
 416         char *rla = getenv("GIT_REFLOG_ACTION");
 417         struct ref_transaction *transaction;
 418         struct strbuf err = STRBUF_INIT;
 419         int ret, df_conflict = 0;
 420
 421         if (dry_run)
 422                 return 0;
 423         if (!rla)
 424                 rla = default_rla.buf;
 425         snprintf(msg, sizeof(msg), "%s: %s", rla, action);
 426
 427         transaction = ref_transaction_begin(&err);
 428         if (!transaction ||
 429             ref_transaction_update(transaction, ref->name,
 430                                    ref->new_oid.hash,
 431                                    check_old ? ref->old_oid.hash : NULL,
 432                                    0, msg, &err))
 433                 goto fail;
 434
 435         ret = ref_transaction_commit(transaction, &err);
 436         if (ret) {
 437                 df_conflict = (ret == TRANSACTION_NAME_CONFLICT);
 438                 goto fail;
 439         }
 440
 441         ref_transaction_free(transaction);
 442         strbuf_release(&err);
 443         return 0;
 444 fail:
 445         ref_transaction_free(transaction);
 446         error("%s", err.buf);
 447         strbuf_release(&err);
 448         return df_conflict ? STORE_REF_ERROR_DF_CONFLICT
 449                            : STORE_REF_ERROR_OTHER;
 450 }
 451
 452 #define REFCOL_WIDTH  10
 453
 454 static int update_local_ref(struct ref *ref,
 455                             const char *remote,
 456                             const struct ref *remote_ref,
 457                             struct strbuf *display)
 458 {
 459         struct commit *current = NULL, *updated;
 460         enum object_type type;
 461         struct branch *current_branch = branch_get(NULL);
 462         const char *pretty_ref = prettify_refname(ref->name);
 463
 464         type = sha1_object_info(ref->new_oid.hash, NULL);
 465         if (type < 0)
 466                 die(_("object %s not found"), oid_to_hex(&ref->new_oid));
 467
 468         if (!oidcmp(&ref->old_oid, &ref->new_oid)) {
 469                 if (verbosity > 0)
 470                         strbuf_addf(display, "= %-*s %-*s -> %s",
 471                                     TRANSPORT_SUMMARY(_("[up to date]")),
 472                                     REFCOL_WIDTH, remote, pretty_ref);
 473                 return 0;
 474         }
 475
 476         if (current_branch &&
 477             !strcmp(ref->name, current_branch->name) &&
 478             !(update_head_ok || is_bare_repository()) &&
 479             !is_null_oid(&ref->old_oid)) {
 480                 /*
 481                  * If this is the head, and it's not okay to update
 482                  * the head, and the old value of the head isn't empty...
 483                  */
 484                 strbuf_addf(display,
 485                             _("! %-*s %-*s -> %s  (can't fetch in current branch)"),
 486                             TRANSPORT_SUMMARY(_("[rejected]")),
 487                             REFCOL_WIDTH, remote, pretty_ref);
 488                 return 1;
 489         }
 490
 491         if (!is_null_oid(&ref->old_oid) &&
 492             starts_with(ref->name, "refs/tags/")) {
 493                 int r;
 494                 r = s_update_ref("updating tag", ref, 0);
 495                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 496                             r ? '!' : '-',
 497                             TRANSPORT_SUMMARY(_("[tag update]")),
 498                             REFCOL_WIDTH, remote, pretty_ref,
 499                             r ? _("  (unable to update local ref)") : "");
 500                 return r;
 501         }
 502
 503         current = lookup_commit_reference_gently(ref->old_oid.hash, 1);
 504         updated = lookup_commit_reference_gently(ref->new_oid.hash, 1);
 505         if (!current || !updated) {
 506                 const char *msg;
 507                 const char *what;
 508                 int r;
 509                 /*
 510                  * Nicely describe the new ref we're fetching.
 511                  * Base this on the remote's ref name, as it's
 512                  * more likely to follow a standard layout.
 513                  */
 514                 const char *name = remote_ref ? remote_ref->name : "";
 515                 if (starts_with(name, "refs/tags/")) {
 516                         msg = "storing tag";
 517                         what = _("[new tag]");
 518                 } else if (starts_with(name, "refs/heads/")) {
 519                         msg = "storing head";
 520                         what = _("[new branch]");
 521                 } else {
 522                         msg = "storing ref";
 523                         what = _("[new ref]");
 524                 }
 525
 526                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 527                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 528                         check_for_new_submodule_commits(ref->new_oid.hash);
 529                 r = s_update_ref(msg, ref, 0);
 530                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 531                             r ? '!' : '*',
 532                             TRANSPORT_SUMMARY(what),
 533                             REFCOL_WIDTH, remote, pretty_ref,
 534                             r ? _("  (unable to update local ref)") : "");
 535                 return r;
 536         }
 537
 538         if (in_merge_bases(current, updated)) {
 539                 struct strbuf quickref = STRBUF_INIT;
 540                 int r;
 541                 strbuf_add_unique_abbrev(&quickref, current->object.oid.hash, DEFAULT_ABBREV);
 542                 strbuf_addstr(&quickref, "..");
 543                 strbuf_add_unique_abbrev(&quickref, ref->new_oid.hash, DEFAULT_ABBREV);
 544                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 545                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 546                         check_for_new_submodule_commits(ref->new_oid.hash);
 547                 r = s_update_ref("fast-forward", ref, 1);
 548                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 549                             r ? '!' : ' ',
 550                             TRANSPORT_SUMMARY_WIDTH, quickref.buf,
 551                             REFCOL_WIDTH, remote, pretty_ref,
 552                             r ? _("  (unable to update local ref)") : "");
 553                 strbuf_release(&quickref);
 554                 return r;
 555         } else if (force || ref->force) {
 556                 struct strbuf quickref = STRBUF_INIT;
 557                 int r;
 558                 strbuf_add_unique_abbrev(&quickref, current->object.oid.hash, DEFAULT_ABBREV);
 559                 strbuf_addstr(&quickref, "...");
 560                 strbuf_add_unique_abbrev(&quickref, ref->new_oid.hash, DEFAULT_ABBREV);
 561                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 562                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 563                         check_for_new_submodule_commits(ref->new_oid.hash);
 564                 r = s_update_ref("forced-update", ref, 1);
 565                 strbuf_addf(display, "%c %-*s %-*s -> %s  (%s)",
 566                             r ? '!' : '+',
 567                             TRANSPORT_SUMMARY_WIDTH, quickref.buf,
 568                             REFCOL_WIDTH, remote, pretty_ref,
 569                             r ? _("unable to update local ref") : _("forced update"));
 570                 strbuf_release(&quickref);
 571                 return r;
 572         } else {
 573                 strbuf_addf(display, "! %-*s %-*s -> %s  %s",
 574                             TRANSPORT_SUMMARY(_("[rejected]")),
 575                             REFCOL_WIDTH, remote, pretty_ref,
 576                             _("(non-fast-forward)"));
 577                 return 1;
 578         }
 579 }
 580
 581 static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
 582 {
 583         struct ref **rm = cb_data;
 584         struct ref *ref = *rm;
 585
 586         while (ref && ref->status == REF_STATUS_REJECT_SHALLOW)
 587                 ref = ref->next;
 588         if (!ref)
 589                 return -1; /* end of the list */
 590         *rm = ref->next;
 591         hashcpy(sha1, ref->old_oid.hash);
 592         return 0;
 593 }
 594
 595 static int store_updated_refs(const char *raw_url, const char *remote_name,
 596                 struct ref *ref_map)
 597 {
 598         FILE *fp;
 599         struct commit *commit;
 600         int url_len, i, rc = 0;
 601         struct strbuf note = STRBUF_INIT;
 602         const char *what, *kind;
 603         struct ref *rm;
 604         char *url;
 605         const char *filename = dry_run ? "/dev/null" : git_path_fetch_head();
 606         int want_status;
 607
 608         fp = fopen(filename, "a");
 609         if (!fp)
 610                 return error_errno(_("cannot open %s"), filename);
 611
 612         if (raw_url)
 613                 url = transport_anonymize_url(raw_url);
 614         else
 615                 url = xstrdup("foreign");
 616
 617         rm = ref_map;
 618         if (check_everything_connected(iterate_ref_map, 0, &rm)) {
 619                 rc = error(_("%s did not send all necessary objects\n"), url);
 620                 goto abort;
 621         }
 622
 623         /*
 624          * We do a pass for each fetch_head_status type in their enum order, so
 625          * merged entries are written before not-for-merge. That lets readers
 626          * use FETCH_HEAD as a refname to refer to the ref to be merged.
 627          */
 628         for (want_status = FETCH_HEAD_MERGE;
 629              want_status <= FETCH_HEAD_IGNORE;
 630              want_status++) {
 631                 for (rm = ref_map; rm; rm = rm->next) {
 632                         struct ref *ref = NULL;
 633                         const char *merge_status_marker = "";
 634
 635                         if (rm->status == REF_STATUS_REJECT_SHALLOW) {
 636                                 if (want_status == FETCH_HEAD_MERGE)
 637                                         warning(_("reject %s because shallow roots are not allowed to be updated"),
 638                                                 rm->peer_ref ? rm->peer_ref->name : rm->name);
 639                                 continue;
 640                         }
 641
 642                         commit = lookup_commit_reference_gently(rm->old_oid.hash, 1);
 643                         if (!commit)
 644                                 rm->fetch_head_status = FETCH_HEAD_NOT_FOR_MERGE;
 645
 646                         if (rm->fetch_head_status != want_status)
 647                                 continue;
 648
 649                         if (rm->peer_ref) {
 650                                 ref = alloc_ref(rm->peer_ref->name);
 651                                 oidcpy(&ref->old_oid, &rm->peer_ref->old_oid);
 652                                 oidcpy(&ref->new_oid, &rm->old_oid);
 653                                 ref->force = rm->peer_ref->force;
 654                         }
 655
 656
 657                         if (!strcmp(rm->name, "HEAD")) {
 658                                 kind = "";
 659                                 what = "";
 660                         }
 661                         else if (starts_with(rm->name, "refs/heads/")) {
 662                                 kind = "branch";
 663                                 what = rm->name + 11;
 664                         }
 665                         else if (starts_with(rm->name, "refs/tags/")) {
 666                                 kind = "tag";
 667                                 what = rm->name + 10;
 668                         }
 669                         else if (starts_with(rm->name, "refs/remotes/")) {
 670                                 kind = "remote-tracking branch";
 671                                 what = rm->name + 13;
 672                         }
 673                         else {
 674                                 kind = "";
 675                                 what = rm->name;
 676                         }
 677
 678                         url_len = strlen(url);
 679                         for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 680                                 ;
 681                         url_len = i + 1;
 682                         if (4 < i && !strncmp(".git", url + i - 3, 4))
 683                                 url_len = i - 3;
 684
 685                         strbuf_reset(&note);
 686                         if (*what) {
 687                                 if (*kind)
 688                                         strbuf_addf(&note, "%s ", kind);
 689                                 strbuf_addf(&note, "'%s' of ", what);
 690                         }
 691                         switch (rm->fetch_head_status) {
 692                         case FETCH_HEAD_NOT_FOR_MERGE:
 693                                 merge_status_marker = "not-for-merge";
 694                                 /* fall-through */
 695                         case FETCH_HEAD_MERGE:
 696                                 fprintf(fp, "%s\t%s\t%s",
 697                                         oid_to_hex(&rm->old_oid),
 698                                         merge_status_marker,
 699                                         note.buf);
 700                                 for (i = 0; i < url_len; ++i)
 701                                         if ('\n' == url[i])
 702                                                 fputs("\\n", fp);
 703                                         else
 704                                                 fputc(url[i], fp);
 705                                 fputc('\n', fp);
 706                                 break;
 707                         default:
 708                                 /* do not write anything to FETCH_HEAD */
 709                                 break;
 710                         }
 711
 712                         strbuf_reset(&note);
 713                         if (ref) {
 714                                 rc |= update_local_ref(ref, what, rm, &note);
 715                                 free(ref);
 716                         } else
 717                                 strbuf_addf(&note, "* %-*s %-*s -> FETCH_HEAD",
 718                                             TRANSPORT_SUMMARY_WIDTH,
 719                                             *kind ? kind : "branch",
 720                                             REFCOL_WIDTH,
 721                                             *what ? what : "HEAD");
 722                         if (note.len) {
 723                                 if (verbosity >= 0 && !shown_url) {
 724                                         fprintf(stderr, _("From %.*s\n"),
 725                                                         url_len, url);
 726                                         shown_url = 1;
 727                                 }
 728                                 if (verbosity >= 0)
 729                                         fprintf(stderr, " %s\n", note.buf);
 730                         }
 731                 }
 732         }
 733
 734         if (rc & STORE_REF_ERROR_DF_CONFLICT)
 735                 error(_("some local refs could not be updated; try running\n"
 736                       " 'git remote prune %s' to remove any old, conflicting "
 737                       "branches"), remote_name);
 738
 739  abort:
 740         strbuf_release(&note);
 741         free(url);
 742         fclose(fp);
 743         return rc;
 744 }
 745
 746 /*
 747  * We would want to bypass the object transfer altogether if
 748  * everything we are going to fetch already exists and is connected
 749  * locally.
 750  */
 751 static int quickfetch(struct ref *ref_map)
 752 {
 753         struct ref *rm = ref_map;
 754
 755         /*
 756          * If we are deepening a shallow clone we already have these
 757          * objects reachable.  Running rev-list here will return with
 758          * a good (0) exit status and we'll bypass the fetch that we
 759          * really need to perform.  Claiming failure now will ensure
 760          * we perform the network exchange to deepen our history.
 761          */
 762         if (depth)
 763                 return -1;
 764         return check_everything_connected(iterate_ref_map, 1, &rm);
 765 }
 766
 767 static int fetch_refs(struct transport *transport, struct ref *ref_map)
 768 {
 769         int ret = quickfetch(ref_map);
 770         if (ret)
 771                 ret = transport_fetch_refs(transport, ref_map);
 772         if (!ret)
 773                 ret |= store_updated_refs(transport->url,
 774                                 transport->remote->name,
 775                                 ref_map);
 776         transport_unlock_pack(transport);
 777         return ret;
 778 }
 779
 780 static int prune_refs(struct refspec *refs, int ref_count, struct ref *ref_map,
 781                 const char *raw_url)
 782 {
 783         int url_len, i, result = 0;
 784         struct ref *ref, *stale_refs = get_stale_heads(refs, ref_count, ref_map);
 785         char *url;
 786         const char *dangling_msg = dry_run
 787                 ? _("   (%s will become dangling)")
 788                 : _("   (%s has become dangling)");
 789
 790         if (raw_url)
 791                 url = transport_anonymize_url(raw_url);
 792         else
 793                 url = xstrdup("foreign");
 794
 795         url_len = strlen(url);
 796         for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 797                 ;
 798
 799         url_len = i + 1;
 800         if (4 < i && !strncmp(".git", url + i - 3, 4))
 801                 url_len = i - 3;
 802
 803         if (!dry_run) {
 804                 struct string_list refnames = STRING_LIST_INIT_NODUP;
 805
 806                 for (ref = stale_refs; ref; ref = ref->next)
 807                         string_list_append(&refnames, ref->name);
 808
 809                 result = delete_refs(&refnames);
 810                 string_list_clear(&refnames, 0);
 811         }
 812
 813         if (verbosity >= 0) {
 814                 for (ref = stale_refs; ref; ref = ref->next) {
 815                         if (!shown_url) {
 816                                 fprintf(stderr, _("From %.*s\n"), url_len, url);
 817                                 shown_url = 1;
 818                         }
 819                         fprintf(stderr, " x %-*s %-*s -> %s\n",
 820                                 TRANSPORT_SUMMARY(_("[deleted]")),
 821                                 REFCOL_WIDTH, _("(none)"), prettify_refname(ref->name));
 822                         warn_dangling_symref(stderr, dangling_msg, ref->name);
 823                 }
 824         }
 825
 826         free(url);
 827         free_refs(stale_refs);
 828         return result;
 829 }
 830
 831 static void check_not_current_branch(struct ref *ref_map)
 832 {
 833         struct branch *current_branch = branch_get(NULL);
 834
 835         if (is_bare_repository() || !current_branch)
 836                 return;
 837
 838         for (; ref_map; ref_map = ref_map->next)
 839                 if (ref_map->peer_ref && !strcmp(current_branch->refname,
 840                                         ref_map->peer_ref->name))
 841                         die(_("Refusing to fetch into current branch %s "
 842                             "of non-bare repository"), current_branch->refname);
 843 }
 844
 845 static int truncate_fetch_head(void)
 846 {
 847         const char *filename = git_path_fetch_head();
 848         FILE *fp = fopen_for_writing(filename);
 849
 850         if (!fp)
 851                 return error_errno(_("cannot open %s"), filename);
 852         fclose(fp);
 853         return 0;
 854 }
 855
 856 static void set_option(struct transport *transport, const char *name, const char *value)
 857 {
 858         int r = transport_set_option(transport, name, value);
 859         if (r < 0)
 860                 die(_("Option \"%s\" value \"%s\" is not valid for %s"),
 861                     name, value, transport->url);
 862         if (r > 0)
 863                 warning(_("Option \"%s\" is ignored for %s\n"),
 864                         name, transport->url);
 865 }
 866
 867 static struct transport *prepare_transport(struct remote *remote)
 868 {
 869         struct transport *transport;
 870         transport = transport_get(remote, NULL);
 871         transport_set_verbosity(transport, verbosity, progress);
 872         transport->family = family;
 873         if (upload_pack)
 874                 set_option(transport, TRANS_OPT_UPLOADPACK, upload_pack);
 875         if (keep)
 876                 set_option(transport, TRANS_OPT_KEEP, "yes");
 877         if (depth)
 878                 set_option(transport, TRANS_OPT_DEPTH, depth);
 879         if (update_shallow)
 880                 set_option(transport, TRANS_OPT_UPDATE_SHALLOW, "yes");
 881         return transport;
 882 }
 883
 884 static void backfill_tags(struct transport *transport, struct ref *ref_map)
 885 {
 886         if (transport->cannot_reuse) {
 887                 gsecondary = prepare_transport(transport->remote);
 888                 transport = gsecondary;
 889         }
 890
 891         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
 892         transport_set_option(transport, TRANS_OPT_DEPTH, "0");
 893         fetch_refs(transport, ref_map);
 894
 895         if (gsecondary) {
 896                 transport_disconnect(gsecondary);
 897                 gsecondary = NULL;
 898         }
 899 }
 900
 901 static int do_fetch(struct transport *transport,
 902                     struct refspec *refs, int ref_count)
 903 {
 904         struct string_list existing_refs = STRING_LIST_INIT_DUP;
 905         struct ref *ref_map;
 906         struct ref *rm;
 907         int autotags = (transport->remote->fetch_tags == 1);
 908         int retcode = 0;
 909
 910         for_each_ref(add_existing, &existing_refs);
 911
 912         if (tags == TAGS_DEFAULT) {
 913                 if (transport->remote->fetch_tags == 2)
 914                         tags = TAGS_SET;
 915                 if (transport->remote->fetch_tags == -1)
 916                         tags = TAGS_UNSET;
 917         }
 918
 919         if (!transport->get_refs_list || !transport->fetch)
 920                 die(_("Don't know how to fetch from %s"), transport->url);
 921
 922         /* if not appending, truncate FETCH_HEAD */
 923         if (!append && !dry_run) {
 924                 retcode = truncate_fetch_head();
 925                 if (retcode)
 926                         goto cleanup;
 927         }
 928
 929         ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
 930         if (!update_head_ok)
 931                 check_not_current_branch(ref_map);
 932
 933         for (rm = ref_map; rm; rm = rm->next) {
 934                 if (rm->peer_ref) {
 935                         struct string_list_item *peer_item =
 936                                 string_list_lookup(&existing_refs,
 937                                                    rm->peer_ref->name);
 938                         if (peer_item) {
 939                                 struct object_id *old_oid = peer_item->util;
 940                                 oidcpy(&rm->peer_ref->old_oid, old_oid);
 941                         }
 942                 }
 943         }
 944
 945         if (tags == TAGS_DEFAULT && autotags)
 946                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
 947         if (prune) {
 948                 /*
 949                  * We only prune based on refspecs specified
 950                  * explicitly (via command line or configuration); we
 951                  * don't care whether --tags was specified.
 952                  */
 953                 if (ref_count) {
 954                         prune_refs(refs, ref_count, ref_map, transport->url);
 955                 } else {
 956                         prune_refs(transport->remote->fetch,
 957                                    transport->remote->fetch_refspec_nr,
 958                                    ref_map,
 959                                    transport->url);
 960                 }
 961         }
 962         if (fetch_refs(transport, ref_map)) {
 963                 free_refs(ref_map);
 964                 retcode = 1;
 965                 goto cleanup;
 966         }
 967         free_refs(ref_map);
 968
 969         /* if neither --no-tags nor --tags was specified, do automated tag
 970          * following ... */
 971         if (tags == TAGS_DEFAULT && autotags) {
 972                 struct ref **tail = &ref_map;
 973                 ref_map = NULL;
 974                 find_non_local_tags(transport, &ref_map, &tail);
 975                 if (ref_map)
 976                         backfill_tags(transport, ref_map);
 977                 free_refs(ref_map);
 978         }
 979
 980  cleanup:
 981         string_list_clear(&existing_refs, 1);
 982         return retcode;
 983 }
 984
 985 static int get_one_remote_for_fetch(struct remote *remote, void *priv)
 986 {
 987         struct string_list *list = priv;
 988         if (!remote->skip_default_update)
 989                 string_list_append(list, remote->name);
 990         return 0;
 991 }
 992
 993 struct remote_group_data {
 994         const char *name;
 995         struct string_list *list;
 996 };
 997
 998 static int get_remote_group(const char *key, const char *value, void *priv)
 999 {
1000         struct remote_group_data *g = priv;
1001
1002         if (skip_prefix(key, "remotes.", &key) && !strcmp(key, g->name)) {
1003                 /* split list by white space */
1004                 while (*value) {
1005                         size_t wordlen = strcspn(value, " \t\n");
1006
1007                         if (wordlen >= 1)
1008                                 string_list_append_nodup(g->list,
1009                                                    xstrndup(value, wordlen));
1010                         value += wordlen + (value[wordlen] != '\0');
1011                 }
1012         }
1013
1014         return 0;
1015 }
1016
1017 static int add_remote_or_group(const char *name, struct string_list *list)
1018 {
1019         int prev_nr = list->nr;
1020         struct remote_group_data g;
1021         g.name = name; g.list = list;
1022
1023         git_config(get_remote_group, &g);
1024         if (list->nr == prev_nr) {
1025                 struct remote *remote = remote_get(name);
1026                 if (!remote_is_configured(remote))
1027                         return 0;
1028                 string_list_append(list, remote->name);
1029         }
1030         return 1;
1031 }
1032
1033 static void add_options_to_argv(struct argv_array *argv)
1034 {
1035         if (dry_run)
1036                 argv_array_push(argv, "--dry-run");
1037         if (prune != -1)
1038                 argv_array_push(argv, prune ? "--prune" : "--no-prune");
1039         if (update_head_ok)
1040                 argv_array_push(argv, "--update-head-ok");
1041         if (force)
1042                 argv_array_push(argv, "--force");
1043         if (keep)
1044                 argv_array_push(argv, "--keep");
1045         if (recurse_submodules == RECURSE_SUBMODULES_ON)
1046                 argv_array_push(argv, "--recurse-submodules");
1047         else if (recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND)
1048                 argv_array_push(argv, "--recurse-submodules=on-demand");
1049         if (tags == TAGS_SET)
1050                 argv_array_push(argv, "--tags");
1051         else if (tags == TAGS_UNSET)
1052                 argv_array_push(argv, "--no-tags");
1053         if (verbosity >= 2)
1054                 argv_array_push(argv, "-v");
1055         if (verbosity >= 1)
1056                 argv_array_push(argv, "-v");
1057         else if (verbosity < 0)
1058                 argv_array_push(argv, "-q");
1059
1060 }
1061
1062 static int fetch_multiple(struct string_list *list)
1063 {
1064         int i, result = 0;
1065         struct argv_array argv = ARGV_ARRAY_INIT;
1066
1067         if (!append && !dry_run) {
1068                 int errcode = truncate_fetch_head();
1069                 if (errcode)
1070                         return errcode;
1071         }
1072
1073         argv_array_pushl(&argv, "fetch", "--append", NULL);
1074         add_options_to_argv(&argv);
1075
1076         for (i = 0; i < list->nr; i++) {
1077                 const char *name = list->items[i].string;
1078                 argv_array_push(&argv, name);
1079                 if (verbosity >= 0)
1080                         printf(_("Fetching %s\n"), name);
1081                 if (run_command_v_opt(argv.argv, RUN_GIT_CMD)) {
1082                         error(_("Could not fetch %s"), name);
1083                         result = 1;
1084                 }
1085                 argv_array_pop(&argv);
1086         }
1087
1088         argv_array_clear(&argv);
1089         return result;
1090 }
1091
1092 static int fetch_one(struct remote *remote, int argc, const char **argv)
1093 {
1094         static const char **refs = NULL;
1095         struct refspec *refspec;
1096         int ref_nr = 0;
1097         int exit_code;
1098
1099         if (!remote)
1100                 die(_("No remote repository specified.  Please, specify either a URL or a\n"
1101                     "remote name from which new revisions should be fetched."));
1102
1103         gtransport = prepare_transport(remote);
1104
1105         if (prune < 0) {
1106                 /* no command line request */
1107                 if (0 <= gtransport->remote->prune)
1108                         prune = gtransport->remote->prune;
1109                 else if (0 <= fetch_prune_config)
1110                         prune = fetch_prune_config;
1111                 else
1112                         prune = PRUNE_BY_DEFAULT;
1113         }
1114
1115         if (argc > 0) {
1116                 int j = 0;
1117                 int i;
1118                 refs = xcalloc(st_add(argc, 1), sizeof(const char *));
1119                 for (i = 0; i < argc; i++) {
1120                         if (!strcmp(argv[i], "tag")) {
1121                                 i++;
1122                                 if (i >= argc)
1123                                         die(_("You need to specify a tag name."));
1124                                 refs[j++] = xstrfmt("refs/tags/%s:refs/tags/%s",
1125                                                     argv[i], argv[i]);
1126                         } else
1127                                 refs[j++] = argv[i];
1128                 }
1129                 refs[j] = NULL;
1130                 ref_nr = j;
1131         }
1132
1133         sigchain_push_common(unlock_pack_on_signal);
1134         atexit(unlock_pack);
1135         refspec = parse_fetch_refspec(ref_nr, refs);
1136         exit_code = do_fetch(gtransport, refspec, ref_nr);
1137         free_refspec(ref_nr, refspec);
1138         transport_disconnect(gtransport);
1139         gtransport = NULL;
1140         return exit_code;
1141 }
1142
1143 int cmd_fetch(int argc, const char **argv, const char *prefix)
1144 {
1145         int i;
1146         struct string_list list = STRING_LIST_INIT_DUP;
1147         struct remote *remote;
1148         int result = 0;
1149         struct argv_array argv_gc_auto = ARGV_ARRAY_INIT;
1150
1151         packet_trace_identity("fetch");
1152
1153         /* Record the command line for the reflog */
1154         strbuf_addstr(&default_rla, "fetch");
1155         for (i = 1; i < argc; i++)
1156                 strbuf_addf(&default_rla, " %s", argv[i]);
1157
1158         git_config(git_fetch_config, NULL);
1159
1160         argc = parse_options(argc, argv, prefix,
1161                              builtin_fetch_options, builtin_fetch_usage, 0);
1162
1163         if (unshallow) {
1164                 if (depth)
1165                         die(_("--depth and --unshallow cannot be used together"));
1166                 else if (!is_repository_shallow())
1167                         die(_("--unshallow on a complete repository does not make sense"));
1168                 else
1169                         depth = xstrfmt("%d", INFINITE_DEPTH);
1170         }
1171
1172         /* no need to be strict, transport_set_option() will validate it again */
1173         if (depth && atoi(depth) < 1)
1174                 die(_("depth %s is not a positive number"), depth);
1175
1176         if (recurse_submodules != RECURSE_SUBMODULES_OFF) {
1177                 if (recurse_submodules_default) {
1178                         int arg = parse_fetch_recurse_submodules_arg("--recurse-submodules-default", recurse_submodules_default);
1179                         set_config_fetch_recurse_submodules(arg);
1180                 }
1181                 gitmodules_config();
1182                 git_config(submodule_config, NULL);
1183         }
1184
1185         if (all) {
1186                 if (argc == 1)
1187                         die(_("fetch --all does not take a repository argument"));
1188                 else if (argc > 1)
1189                         die(_("fetch --all does not make sense with refspecs"));
1190                 (void) for_each_remote(get_one_remote_for_fetch, &list);
1191                 result = fetch_multiple(&list);
1192         } else if (argc == 0) {
1193                 /* No arguments -- use default remote */
1194                 remote = remote_get(NULL);
1195                 result = fetch_one(remote, argc, argv);
1196         } else if (multiple) {
1197                 /* All arguments are assumed to be remotes or groups */
1198                 for (i = 0; i < argc; i++)
1199                         if (!add_remote_or_group(argv[i], &list))
1200                                 die(_("No such remote or remote group: %s"), argv[i]);
1201                 result = fetch_multiple(&list);
1202         } else {
1203                 /* Single remote or group */
1204                 (void) add_remote_or_group(argv[0], &list);
1205                 if (list.nr > 1) {
1206                         /* More than one remote */
1207                         if (argc > 1)
1208                                 die(_("Fetching a group and specifying refspecs does not make sense"));
1209                         result = fetch_multiple(&list);
1210                 } else {
1211                         /* Zero or one remotes */
1212                         remote = remote_get(argv[0]);
1213                         result = fetch_one(remote, argc-1, argv+1);
1214                 }
1215         }
1216
1217         if (!result && (recurse_submodules != RECURSE_SUBMODULES_OFF)) {
1218                 struct argv_array options = ARGV_ARRAY_INIT;
1219
1220                 add_options_to_argv(&options);
1221                 result = fetch_populated_submodules(&options,
1222                                                     submodule_prefix,
1223                                                     recurse_submodules,
1224                                                     verbosity < 0,
1225                                                     max_children);
1226                 argv_array_clear(&options);
1227         }
1228
1229         string_list_clear(&list, 0);
1230
1231         close_all_packs();
1232
1233         argv_array_pushl(&argv_gc_auto, "gc", "--auto", NULL);
1234         if (verbosity < 0)
1235                 argv_array_push(&argv_gc_auto, "--quiet");
1236         run_command_v_opt(argv_gc_auto.argv, RUN_GIT_CMD);
1237         argv_array_clear(&argv_gc_auto);
1238
1239         return result;
1240 }