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