git.oblomov.eu Git - git/blob - builtin/fetch.c

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