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

   1 /*
   2  * "git fetch"
   3  */
   4 #include "cache.h"
   5 #include "refs.h"
   6 #include "commit.h"
   7 #include "builtin.h"
   8 #include "string-list.h"
   9 #include "remote.h"
  10 #include "transport.h"
  11 #include "run-command.h"
  12 #include "parse-options.h"
  13 #include "sigchain.h"
  14 #include "transport.h"
  15 #include "submodule.h"
  16 #include "connected.h"
  17 #include "argv-array.h"
  18
  19 static const char * const builtin_fetch_usage[] = {
  20         N_("git fetch [<options>] [<repository> [<refspec>...]]"),
  21         N_("git fetch [<options>] <group>"),
  22         N_("git fetch --multiple [<options>] [(<repository> | <group>)...]"),
  23         N_("git fetch --all [<options>]"),
  24         NULL
  25 };
  26
  27 enum {
  28         TAGS_UNSET = 0,
  29         TAGS_DEFAULT = 1,
  30         TAGS_SET = 2
  31 };
  32
  33 static int fetch_prune_config = -1; /* unspecified */
  34 static int prune = -1; /* unspecified */
  35 #define PRUNE_BY_DEFAULT 0 /* do we prune by default? */
  36
  37 static int all, append, dry_run, force, keep, multiple, update_head_ok, verbosity;
  38 static int progress = -1, recurse_submodules = RECURSE_SUBMODULES_DEFAULT;
  39 static int tags = TAGS_DEFAULT, unshallow;
  40 static const char *depth;
  41 static const char *upload_pack;
  42 static struct strbuf default_rla = STRBUF_INIT;
  43 static struct transport *transport;
  44 static const char *submodule_prefix = "";
  45 static const char *recurse_submodules_default;
  46
  47 static int option_parse_recurse_submodules(const struct option *opt,
  48                                    const char *arg, int unset)
  49 {
  50         if (unset) {
  51                 recurse_submodules = RECURSE_SUBMODULES_OFF;
  52         } else {
  53                 if (arg)
  54                         recurse_submodules = parse_fetch_recurse_submodules_arg(opt->long_name, arg);
  55                 else
  56                         recurse_submodules = RECURSE_SUBMODULES_ON;
  57         }
  58         return 0;
  59 }
  60
  61 static int git_fetch_config(const char *k, const char *v, void *cb)
  62 {
  63         if (!strcmp(k, "fetch.prune")) {
  64                 fetch_prune_config = git_config_bool(k, v);
  65                 return 0;
  66         }
  67         return 0;
  68 }
  69
  70 static struct option builtin_fetch_options[] = {
  71         OPT__VERBOSITY(&verbosity),
  72         OPT_BOOLEAN(0, "all", &all,
  73                     N_("fetch from all remotes")),
  74         OPT_BOOLEAN('a', "append", &append,
  75                     N_("append to .git/FETCH_HEAD instead of overwriting")),
  76         OPT_STRING(0, "upload-pack", &upload_pack, N_("path"),
  77                    N_("path to upload pack on remote end")),
  78         OPT__FORCE(&force, N_("force overwrite of local branch")),
  79         OPT_BOOLEAN('m', "multiple", &multiple,
  80                     N_("fetch from multiple remotes")),
  81         OPT_SET_INT('t', "tags", &tags,
  82                     N_("fetch all tags and associated objects"), TAGS_SET),
  83         OPT_SET_INT('n', NULL, &tags,
  84                     N_("do not fetch all tags (--no-tags)"), TAGS_UNSET),
  85         OPT_BOOL('p', "prune", &prune,
  86                  N_("prune remote-tracking branches no longer on remote")),
  87         { OPTION_CALLBACK, 0, "recurse-submodules", NULL, N_("on-demand"),
  88                     N_("control recursive fetching of submodules"),
  89                     PARSE_OPT_OPTARG, option_parse_recurse_submodules },
  90         OPT_BOOLEAN(0, "dry-run", &dry_run,
  91                     N_("dry run")),
  92         OPT_BOOLEAN('k', "keep", &keep, N_("keep downloaded pack")),
  93         OPT_BOOLEAN('u', "update-head-ok", &update_head_ok,
  94                     N_("allow updating of HEAD ref")),
  95         OPT_BOOL(0, "progress", &progress, N_("force progress reporting")),
  96         OPT_STRING(0, "depth", &depth, N_("depth"),
  97                    N_("deepen history of shallow clone")),
  98         { OPTION_SET_INT, 0, "unshallow", &unshallow, NULL,
  99                    N_("convert to a complete repository"),
 100                    PARSE_OPT_NONEG | PARSE_OPT_NOARG, NULL, 1 },
 101         { OPTION_STRING, 0, "submodule-prefix", &submodule_prefix, N_("dir"),
 102                    N_("prepend this to submodule path output"), PARSE_OPT_HIDDEN },
 103         { OPTION_STRING, 0, "recurse-submodules-default",
 104                    &recurse_submodules_default, NULL,
 105                    N_("default mode for recursion"), PARSE_OPT_HIDDEN },
 106         OPT_END()
 107 };
 108
 109 static void unlock_pack(void)
 110 {
 111         if (transport)
 112                 transport_unlock_pack(transport);
 113 }
 114
 115 static void unlock_pack_on_signal(int signo)
 116 {
 117         unlock_pack();
 118         sigchain_pop(signo);
 119         raise(signo);
 120 }
 121
 122 static void add_merge_config(struct ref **head,
 123                            const struct ref *remote_refs,
 124                            struct branch *branch,
 125                            struct ref ***tail)
 126 {
 127         int i;
 128
 129         for (i = 0; i < branch->merge_nr; i++) {
 130                 struct ref *rm, **old_tail = *tail;
 131                 struct refspec refspec;
 132
 133                 for (rm = *head; rm; rm = rm->next) {
 134                         if (branch_merge_matches(branch, i, rm->name)) {
 135                                 rm->merge = 1;
 136                                 break;
 137                         }
 138                 }
 139                 if (rm)
 140                         continue;
 141
 142                 /*
 143                  * Not fetched to a remote-tracking branch?  We need to fetch
 144                  * it anyway to allow this branch's "branch.$name.merge"
 145                  * to be honored by 'git pull', but we do not have to
 146                  * fail if branch.$name.merge is misconfigured to point
 147                  * at a nonexisting branch.  If we were indeed called by
 148                  * 'git pull', it will notice the misconfiguration because
 149                  * there is no entry in the resulting FETCH_HEAD marked
 150                  * for merging.
 151                  */
 152                 memset(&refspec, 0, sizeof(refspec));
 153                 refspec.src = branch->merge[i]->src;
 154                 get_fetch_map(remote_refs, &refspec, tail, 1);
 155                 for (rm = *old_tail; rm; rm = rm->next)
 156                         rm->merge = 1;
 157         }
 158 }
 159
 160 static void find_non_local_tags(struct transport *transport,
 161                         struct ref **head,
 162                         struct ref ***tail);
 163
 164 static struct ref *get_ref_map(struct transport *transport,
 165                                struct refspec *refs, int ref_count, int tags,
 166                                int *autotags)
 167 {
 168         int i;
 169         struct ref *rm;
 170         struct ref *ref_map = NULL;
 171         struct ref **tail = &ref_map;
 172
 173         const struct ref *remote_refs = transport_get_remote_refs(transport);
 174
 175         if (ref_count || tags == TAGS_SET) {
 176                 for (i = 0; i < ref_count; i++) {
 177                         get_fetch_map(remote_refs, &refs[i], &tail, 0);
 178                         if (refs[i].dst && refs[i].dst[0])
 179                                 *autotags = 1;
 180                 }
 181                 /* Merge everything on the command line, but not --tags */
 182                 for (rm = ref_map; rm; rm = rm->next)
 183                         rm->merge = 1;
 184                 if (tags == TAGS_SET)
 185                         get_fetch_map(remote_refs, tag_refspec, &tail, 0);
 186         } else {
 187                 /* Use the defaults */
 188                 struct remote *remote = transport->remote;
 189                 struct branch *branch = branch_get(NULL);
 190                 int has_merge = branch_has_merge_config(branch);
 191                 if (remote &&
 192                     (remote->fetch_refspec_nr ||
 193                      /* Note: has_merge implies non-NULL branch->remote_name */
 194                      (has_merge && !strcmp(branch->remote_name, remote->name)))) {
 195                         for (i = 0; i < remote->fetch_refspec_nr; i++) {
 196                                 get_fetch_map(remote_refs, &remote->fetch[i], &tail, 0);
 197                                 if (remote->fetch[i].dst &&
 198                                     remote->fetch[i].dst[0])
 199                                         *autotags = 1;
 200                                 if (!i && !has_merge && ref_map &&
 201                                     !remote->fetch[0].pattern)
 202                                         ref_map->merge = 1;
 203                         }
 204                         /*
 205                          * if the remote we're fetching from is the same
 206                          * as given in branch.<name>.remote, we add the
 207                          * ref given in branch.<name>.merge, too.
 208                          *
 209                          * Note: has_merge implies non-NULL branch->remote_name
 210                          */
 211                         if (has_merge &&
 212                             !strcmp(branch->remote_name, remote->name))
 213                                 add_merge_config(&ref_map, remote_refs, branch, &tail);
 214                 } else {
 215                         ref_map = get_remote_ref(remote_refs, "HEAD");
 216                         if (!ref_map)
 217                                 die(_("Couldn't find remote ref HEAD"));
 218                         ref_map->merge = 1;
 219                         tail = &ref_map->next;
 220                 }
 221         }
 222         if (tags == TAGS_DEFAULT && *autotags)
 223                 find_non_local_tags(transport, &ref_map, &tail);
 224         ref_remove_duplicates(ref_map);
 225
 226         return ref_map;
 227 }
 228
 229 #define STORE_REF_ERROR_OTHER 1
 230 #define STORE_REF_ERROR_DF_CONFLICT 2
 231
 232 static int s_update_ref(const char *action,
 233                         struct ref *ref,
 234                         int check_old)
 235 {
 236         char msg[1024];
 237         char *rla = getenv("GIT_REFLOG_ACTION");
 238         static struct ref_lock *lock;
 239
 240         if (dry_run)
 241                 return 0;
 242         if (!rla)
 243                 rla = default_rla.buf;
 244         snprintf(msg, sizeof(msg), "%s: %s", rla, action);
 245         lock = lock_any_ref_for_update(ref->name,
 246                                        check_old ? ref->old_sha1 : NULL, 0);
 247         if (!lock)
 248                 return errno == ENOTDIR ? STORE_REF_ERROR_DF_CONFLICT :
 249                                           STORE_REF_ERROR_OTHER;
 250         if (write_ref_sha1(lock, ref->new_sha1, msg) < 0)
 251                 return errno == ENOTDIR ? STORE_REF_ERROR_DF_CONFLICT :
 252                                           STORE_REF_ERROR_OTHER;
 253         return 0;
 254 }
 255
 256 #define REFCOL_WIDTH  10
 257
 258 static int update_local_ref(struct ref *ref,
 259                             const char *remote,
 260                             const struct ref *remote_ref,
 261                             struct strbuf *display)
 262 {
 263         struct commit *current = NULL, *updated;
 264         enum object_type type;
 265         struct branch *current_branch = branch_get(NULL);
 266         const char *pretty_ref = prettify_refname(ref->name);
 267
 268         type = sha1_object_info(ref->new_sha1, NULL);
 269         if (type < 0)
 270                 die(_("object %s not found"), sha1_to_hex(ref->new_sha1));
 271
 272         if (!hashcmp(ref->old_sha1, ref->new_sha1)) {
 273                 if (verbosity > 0)
 274                         strbuf_addf(display, "= %-*s %-*s -> %s",
 275                                     TRANSPORT_SUMMARY(_("[up to date]")),
 276                                     REFCOL_WIDTH, remote, pretty_ref);
 277                 return 0;
 278         }
 279
 280         if (current_branch &&
 281             !strcmp(ref->name, current_branch->name) &&
 282             !(update_head_ok || is_bare_repository()) &&
 283             !is_null_sha1(ref->old_sha1)) {
 284                 /*
 285                  * If this is the head, and it's not okay to update
 286                  * the head, and the old value of the head isn't empty...
 287                  */
 288                 strbuf_addf(display,
 289                             _("! %-*s %-*s -> %s  (can't fetch in current branch)"),
 290                             TRANSPORT_SUMMARY(_("[rejected]")),
 291                             REFCOL_WIDTH, remote, pretty_ref);
 292                 return 1;
 293         }
 294
 295         if (!is_null_sha1(ref->old_sha1) &&
 296             !prefixcmp(ref->name, "refs/tags/")) {
 297                 int r;
 298                 r = s_update_ref("updating tag", ref, 0);
 299                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 300                             r ? '!' : '-',
 301                             TRANSPORT_SUMMARY(_("[tag update]")),
 302                             REFCOL_WIDTH, remote, pretty_ref,
 303                             r ? _("  (unable to update local ref)") : "");
 304                 return r;
 305         }
 306
 307         current = lookup_commit_reference_gently(ref->old_sha1, 1);
 308         updated = lookup_commit_reference_gently(ref->new_sha1, 1);
 309         if (!current || !updated) {
 310                 const char *msg;
 311                 const char *what;
 312                 int r;
 313                 /*
 314                  * Nicely describe the new ref we're fetching.
 315                  * Base this on the remote's ref name, as it's
 316                  * more likely to follow a standard layout.
 317                  */
 318                 const char *name = remote_ref ? remote_ref->name : "";
 319                 if (!prefixcmp(name, "refs/tags/")) {
 320                         msg = "storing tag";
 321                         what = _("[new tag]");
 322                 } else if (!prefixcmp(name, "refs/heads/")) {
 323                         msg = "storing head";
 324                         what = _("[new branch]");
 325                 } else {
 326                         msg = "storing ref";
 327                         what = _("[new ref]");
 328                 }
 329
 330                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 331                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 332                         check_for_new_submodule_commits(ref->new_sha1);
 333                 r = s_update_ref(msg, ref, 0);
 334                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 335                             r ? '!' : '*',
 336                             TRANSPORT_SUMMARY(what),
 337                             REFCOL_WIDTH, remote, pretty_ref,
 338                             r ? _("  (unable to update local ref)") : "");
 339                 return r;
 340         }
 341
 342         if (in_merge_bases(current, updated)) {
 343                 char quickref[83];
 344                 int r;
 345                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 346                 strcat(quickref, "..");
 347                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 348                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 349                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 350                         check_for_new_submodule_commits(ref->new_sha1);
 351                 r = s_update_ref("fast-forward", ref, 1);
 352                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 353                             r ? '!' : ' ',
 354                             TRANSPORT_SUMMARY_WIDTH, quickref,
 355                             REFCOL_WIDTH, remote, pretty_ref,
 356                             r ? _("  (unable to update local ref)") : "");
 357                 return r;
 358         } else if (force || ref->force) {
 359                 char quickref[84];
 360                 int r;
 361                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 362                 strcat(quickref, "...");
 363                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 364                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 365                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 366                         check_for_new_submodule_commits(ref->new_sha1);
 367                 r = s_update_ref("forced-update", ref, 1);
 368                 strbuf_addf(display, "%c %-*s %-*s -> %s  (%s)",
 369                             r ? '!' : '+',
 370                             TRANSPORT_SUMMARY_WIDTH, quickref,
 371                             REFCOL_WIDTH, remote, pretty_ref,
 372                             r ? _("unable to update local ref") : _("forced update"));
 373                 return r;
 374         } else {
 375                 strbuf_addf(display, "! %-*s %-*s -> %s  %s",
 376                             TRANSPORT_SUMMARY(_("[rejected]")),
 377                             REFCOL_WIDTH, remote, pretty_ref,
 378                             _("(non-fast-forward)"));
 379                 return 1;
 380         }
 381 }
 382
 383 static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
 384 {
 385         struct ref **rm = cb_data;
 386         struct ref *ref = *rm;
 387
 388         if (!ref)
 389                 return -1; /* end of the list */
 390         *rm = ref->next;
 391         hashcpy(sha1, ref->old_sha1);
 392         return 0;
 393 }
 394
 395 static int store_updated_refs(const char *raw_url, const char *remote_name,
 396                 struct ref *ref_map)
 397 {
 398         FILE *fp;
 399         struct commit *commit;
 400         int url_len, i, shown_url = 0, rc = 0;
 401         struct strbuf note = STRBUF_INIT;
 402         const char *what, *kind;
 403         struct ref *rm;
 404         char *url, *filename = dry_run ? "/dev/null" : git_path("FETCH_HEAD");
 405         int want_merge;
 406
 407         fp = fopen(filename, "a");
 408         if (!fp)
 409                 return error(_("cannot open %s: %s\n"), filename, strerror(errno));
 410
 411         if (raw_url)
 412                 url = transport_anonymize_url(raw_url);
 413         else
 414                 url = xstrdup("foreign");
 415
 416         rm = ref_map;
 417         if (check_everything_connected(iterate_ref_map, 0, &rm)) {
 418                 rc = error(_("%s did not send all necessary objects\n"), url);
 419                 goto abort;
 420         }
 421
 422         /*
 423          * The first pass writes objects to be merged and then the
 424          * second pass writes the rest, in order to allow using
 425          * FETCH_HEAD as a refname to refer to the ref to be merged.
 426          */
 427         for (want_merge = 1; 0 <= want_merge; want_merge--) {
 428                 for (rm = ref_map; rm; rm = rm->next) {
 429                         struct ref *ref = NULL;
 430
 431                         commit = lookup_commit_reference_gently(rm->old_sha1, 1);
 432                         if (!commit)
 433                                 rm->merge = 0;
 434
 435                         if (rm->merge != want_merge)
 436                                 continue;
 437
 438                         if (rm->peer_ref) {
 439                                 ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
 440                                 strcpy(ref->name, rm->peer_ref->name);
 441                                 hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
 442                                 hashcpy(ref->new_sha1, rm->old_sha1);
 443                                 ref->force = rm->peer_ref->force;
 444                         }
 445
 446
 447                         if (!strcmp(rm->name, "HEAD")) {
 448                                 kind = "";
 449                                 what = "";
 450                         }
 451                         else if (!prefixcmp(rm->name, "refs/heads/")) {
 452                                 kind = "branch";
 453                                 what = rm->name + 11;
 454                         }
 455                         else if (!prefixcmp(rm->name, "refs/tags/")) {
 456                                 kind = "tag";
 457                                 what = rm->name + 10;
 458                         }
 459                         else if (!prefixcmp(rm->name, "refs/remotes/")) {
 460                                 kind = "remote-tracking branch";
 461                                 what = rm->name + 13;
 462                         }
 463                         else {
 464                                 kind = "";
 465                                 what = rm->name;
 466                         }
 467
 468                         url_len = strlen(url);
 469                         for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 470                                 ;
 471                         url_len = i + 1;
 472                         if (4 < i && !strncmp(".git", url + i - 3, 4))
 473                                 url_len = i - 3;
 474
 475                         strbuf_reset(&note);
 476                         if (*what) {
 477                                 if (*kind)
 478                                         strbuf_addf(&note, "%s ", kind);
 479                                 strbuf_addf(&note, "'%s' of ", what);
 480                         }
 481                         fprintf(fp, "%s\t%s\t%s",
 482                                 sha1_to_hex(rm->old_sha1),
 483                                 rm->merge ? "" : "not-for-merge",
 484                                 note.buf);
 485                         for (i = 0; i < url_len; ++i)
 486                                 if ('\n' == url[i])
 487                                         fputs("\\n", fp);
 488                                 else
 489                                         fputc(url[i], fp);
 490                         fputc('\n', fp);
 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                 /*
 756                  * If --tags was specified, pretend that the user gave us
 757                  * the canonical tags refspec
 758                  */
 759                 if (tags == TAGS_SET) {
 760                         const char *tags_str = "refs/tags/*:refs/tags/*";
 761                         struct refspec *tags_refspec, *refspec;
 762
 763                         /* Copy the refspec and add the tags to it */
 764                         refspec = xcalloc(ref_count + 1, sizeof(struct refspec));
 765                         tags_refspec = parse_fetch_refspec(1, &tags_str);
 766                         memcpy(refspec, refs, ref_count * sizeof(struct refspec));
 767                         memcpy(&refspec[ref_count], tags_refspec, sizeof(struct refspec));
 768                         ref_count++;
 769
 770                         prune_refs(refspec, ref_count, ref_map);
 771
 772                         ref_count--;
 773                         /* The rest of the strings belong to fetch_one */
 774                         free_refspec(1, tags_refspec);
 775                         free(refspec);
 776                 } else if (ref_count) {
 777                         prune_refs(refs, ref_count, ref_map);
 778                 } else {
 779                         prune_refs(transport->remote->fetch, transport->remote->fetch_refspec_nr, ref_map);
 780                 }
 781         }
 782         free_refs(ref_map);
 783
 784         /* if neither --no-tags nor --tags was specified, do automated tag
 785          * following ... */
 786         if (tags == TAGS_DEFAULT && autotags) {
 787                 struct ref **tail = &ref_map;
 788                 ref_map = NULL;
 789                 find_non_local_tags(transport, &ref_map, &tail);
 790                 if (ref_map) {
 791                         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
 792                         transport_set_option(transport, TRANS_OPT_DEPTH, "0");
 793                         fetch_refs(transport, ref_map);
 794                 }
 795                 free_refs(ref_map);
 796         }
 797
 798         return 0;
 799 }
 800
 801 static void set_option(const char *name, const char *value)
 802 {
 803         int r = transport_set_option(transport, name, value);
 804         if (r < 0)
 805                 die(_("Option \"%s\" value \"%s\" is not valid for %s"),
 806                         name, value, transport->url);
 807         if (r > 0)
 808                 warning(_("Option \"%s\" is ignored for %s\n"),
 809                         name, transport->url);
 810 }
 811
 812 static int get_one_remote_for_fetch(struct remote *remote, void *priv)
 813 {
 814         struct string_list *list = priv;
 815         if (!remote->skip_default_update)
 816                 string_list_append(list, remote->name);
 817         return 0;
 818 }
 819
 820 struct remote_group_data {
 821         const char *name;
 822         struct string_list *list;
 823 };
 824
 825 static int get_remote_group(const char *key, const char *value, void *priv)
 826 {
 827         struct remote_group_data *g = priv;
 828
 829         if (!prefixcmp(key, "remotes.") &&
 830                         !strcmp(key + 8, g->name)) {
 831                 /* split list by white space */
 832                 int space = strcspn(value, " \t\n");
 833                 while (*value) {
 834                         if (space > 1) {
 835                                 string_list_append(g->list,
 836                                                    xstrndup(value, space));
 837                         }
 838                         value += space + (value[space] != '\0');
 839                         space = strcspn(value, " \t\n");
 840                 }
 841         }
 842
 843         return 0;
 844 }
 845
 846 static int add_remote_or_group(const char *name, struct string_list *list)
 847 {
 848         int prev_nr = list->nr;
 849         struct remote_group_data g;
 850         g.name = name; g.list = list;
 851
 852         git_config(get_remote_group, &g);
 853         if (list->nr == prev_nr) {
 854                 struct remote *remote;
 855                 if (!remote_is_configured(name))
 856                         return 0;
 857                 remote = remote_get(name);
 858                 string_list_append(list, remote->name);
 859         }
 860         return 1;
 861 }
 862
 863 static void add_options_to_argv(struct argv_array *argv)
 864 {
 865         if (dry_run)
 866                 argv_array_push(argv, "--dry-run");
 867         if (prune > 0)
 868                 argv_array_push(argv, "--prune");
 869         if (update_head_ok)
 870                 argv_array_push(argv, "--update-head-ok");
 871         if (force)
 872                 argv_array_push(argv, "--force");
 873         if (keep)
 874                 argv_array_push(argv, "--keep");
 875         if (recurse_submodules == RECURSE_SUBMODULES_ON)
 876                 argv_array_push(argv, "--recurse-submodules");
 877         else if (recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND)
 878                 argv_array_push(argv, "--recurse-submodules=on-demand");
 879         if (tags == TAGS_SET)
 880                 argv_array_push(argv, "--tags");
 881         else if (tags == TAGS_UNSET)
 882                 argv_array_push(argv, "--no-tags");
 883         if (verbosity >= 2)
 884                 argv_array_push(argv, "-v");
 885         if (verbosity >= 1)
 886                 argv_array_push(argv, "-v");
 887         else if (verbosity < 0)
 888                 argv_array_push(argv, "-q");
 889
 890 }
 891
 892 static int fetch_multiple(struct string_list *list)
 893 {
 894         int i, result = 0;
 895         struct argv_array argv = ARGV_ARRAY_INIT;
 896
 897         if (!append && !dry_run) {
 898                 int errcode = truncate_fetch_head();
 899                 if (errcode)
 900                         return errcode;
 901         }
 902
 903         argv_array_pushl(&argv, "fetch", "--append", NULL);
 904         add_options_to_argv(&argv);
 905
 906         for (i = 0; i < list->nr; i++) {
 907                 const char *name = list->items[i].string;
 908                 argv_array_push(&argv, name);
 909                 if (verbosity >= 0)
 910                         printf(_("Fetching %s\n"), name);
 911                 if (run_command_v_opt(argv.argv, RUN_GIT_CMD)) {
 912                         error(_("Could not fetch %s"), name);
 913                         result = 1;
 914                 }
 915                 argv_array_pop(&argv);
 916         }
 917
 918         argv_array_clear(&argv);
 919         return result;
 920 }
 921
 922 static int fetch_one(struct remote *remote, int argc, const char **argv)
 923 {
 924         int i;
 925         static const char **refs = NULL;
 926         struct refspec *refspec;
 927         int ref_nr = 0;
 928         int exit_code;
 929
 930         if (!remote)
 931                 die(_("No remote repository specified.  Please, specify either a URL or a\n"
 932                     "remote name from which new revisions should be fetched."));
 933
 934         transport = transport_get(remote, NULL);
 935
 936         if (prune < 0) {
 937                 /* no command line request */
 938                 if (0 <= transport->remote->prune)
 939                         prune = transport->remote->prune;
 940                 else if (0 <= fetch_prune_config)
 941                         prune = fetch_prune_config;
 942                 else
 943                         prune = PRUNE_BY_DEFAULT;
 944         }
 945
 946         transport_set_verbosity(transport, verbosity, progress);
 947         if (upload_pack)
 948                 set_option(TRANS_OPT_UPLOADPACK, upload_pack);
 949         if (keep)
 950                 set_option(TRANS_OPT_KEEP, "yes");
 951         if (depth)
 952                 set_option(TRANS_OPT_DEPTH, depth);
 953
 954         if (argc > 0) {
 955                 int j = 0;
 956                 refs = xcalloc(argc + 1, sizeof(const char *));
 957                 for (i = 0; i < argc; i++) {
 958                         if (!strcmp(argv[i], "tag")) {
 959                                 char *ref;
 960                                 i++;
 961                                 if (i >= argc)
 962                                         die(_("You need to specify a tag name."));
 963                                 ref = xmalloc(strlen(argv[i]) * 2 + 22);
 964                                 strcpy(ref, "refs/tags/");
 965                                 strcat(ref, argv[i]);
 966                                 strcat(ref, ":refs/tags/");
 967                                 strcat(ref, argv[i]);
 968                                 refs[j++] = ref;
 969                         } else
 970                                 refs[j++] = argv[i];
 971                 }
 972                 refs[j] = NULL;
 973                 ref_nr = j;
 974         }
 975
 976         sigchain_push_common(unlock_pack_on_signal);
 977         atexit(unlock_pack);
 978         refspec = parse_fetch_refspec(ref_nr, refs);
 979         exit_code = do_fetch(transport, refspec, ref_nr);
 980         free_refspec(ref_nr, refspec);
 981         transport_disconnect(transport);
 982         transport = NULL;
 983         return exit_code;
 984 }
 985
 986 int cmd_fetch(int argc, const char **argv, const char *prefix)
 987 {
 988         int i;
 989         struct string_list list = STRING_LIST_INIT_NODUP;
 990         struct remote *remote;
 991         int result = 0;
 992         static const char *argv_gc_auto[] = {
 993                 "gc", "--auto", NULL,
 994         };
 995
 996         packet_trace_identity("fetch");
 997
 998         /* Record the command line for the reflog */
 999         strbuf_addstr(&default_rla, "fetch");
1000         for (i = 1; i < argc; i++)
1001                 strbuf_addf(&default_rla, " %s", argv[i]);
1002
1003         git_config(git_fetch_config, NULL);
1004
1005         argc = parse_options(argc, argv, prefix,
1006                              builtin_fetch_options, builtin_fetch_usage, 0);
1007
1008         if (unshallow) {
1009                 if (depth)
1010                         die(_("--depth and --unshallow cannot be used together"));
1011                 else if (!is_repository_shallow())
1012                         die(_("--unshallow on a complete repository does not make sense"));
1013                 else {
1014                         static char inf_depth[12];
1015                         sprintf(inf_depth, "%d", INFINITE_DEPTH);
1016                         depth = inf_depth;
1017                 }
1018         }
1019
1020         if (recurse_submodules != RECURSE_SUBMODULES_OFF) {
1021                 if (recurse_submodules_default) {
1022                         int arg = parse_fetch_recurse_submodules_arg("--recurse-submodules-default", recurse_submodules_default);
1023                         set_config_fetch_recurse_submodules(arg);
1024                 }
1025                 gitmodules_config();
1026                 git_config(submodule_config, NULL);
1027         }
1028
1029         if (all) {
1030                 if (argc == 1)
1031                         die(_("fetch --all does not take a repository argument"));
1032                 else if (argc > 1)
1033                         die(_("fetch --all does not make sense with refspecs"));
1034                 (void) for_each_remote(get_one_remote_for_fetch, &list);
1035                 result = fetch_multiple(&list);
1036         } else if (argc == 0) {
1037                 /* No arguments -- use default remote */
1038                 remote = remote_get(NULL);
1039                 result = fetch_one(remote, argc, argv);
1040         } else if (multiple) {
1041                 /* All arguments are assumed to be remotes or groups */
1042                 for (i = 0; i < argc; i++)
1043                         if (!add_remote_or_group(argv[i], &list))
1044                                 die(_("No such remote or remote group: %s"), argv[i]);
1045                 result = fetch_multiple(&list);
1046         } else {
1047                 /* Single remote or group */
1048                 (void) add_remote_or_group(argv[0], &list);
1049                 if (list.nr > 1) {
1050                         /* More than one remote */
1051                         if (argc > 1)
1052                                 die(_("Fetching a group and specifying refspecs does not make sense"));
1053                         result = fetch_multiple(&list);
1054                 } else {
1055                         /* Zero or one remotes */
1056                         remote = remote_get(argv[0]);
1057                         result = fetch_one(remote, argc-1, argv+1);
1058                 }
1059         }
1060
1061         if (!result && (recurse_submodules != RECURSE_SUBMODULES_OFF)) {
1062                 struct argv_array options = ARGV_ARRAY_INIT;
1063
1064                 add_options_to_argv(&options);
1065                 result = fetch_populated_submodules(&options,
1066                                                     submodule_prefix,
1067                                                     recurse_submodules,
1068                                                     verbosity < 0);
1069                 argv_array_clear(&options);
1070         }
1071
1072         /* All names were strdup()ed or strndup()ed */
1073         list.strdup_strings = 1;
1074         string_list_clear(&list, 0);
1075
1076         run_command_v_opt(argv_gc_auto, RUN_GIT_CMD);
1077
1078         return result;
1079 }