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 *gtransport;
  44 static struct transport *gsecondary;
  45 static const char *submodule_prefix = "";
  46 static const char *recurse_submodules_default;
  47
  48 static int option_parse_recurse_submodules(const struct option *opt,
  49                                    const char *arg, int unset)
  50 {
  51         if (unset) {
  52                 recurse_submodules = RECURSE_SUBMODULES_OFF;
  53         } else {
  54                 if (arg)
  55                         recurse_submodules = parse_fetch_recurse_submodules_arg(opt->long_name, arg);
  56                 else
  57                         recurse_submodules = RECURSE_SUBMODULES_ON;
  58         }
  59         return 0;
  60 }
  61
  62 static int git_fetch_config(const char *k, const char *v, void *cb)
  63 {
  64         if (!strcmp(k, "fetch.prune")) {
  65                 fetch_prune_config = git_config_bool(k, v);
  66                 return 0;
  67         }
  68         return 0;
  69 }
  70
  71 static struct option builtin_fetch_options[] = {
  72         OPT__VERBOSITY(&verbosity),
  73         OPT_BOOL(0, "all", &all,
  74                  N_("fetch from all remotes")),
  75         OPT_BOOL('a', "append", &append,
  76                  N_("append to .git/FETCH_HEAD instead of overwriting")),
  77         OPT_STRING(0, "upload-pack", &upload_pack, N_("path"),
  78                    N_("path to upload pack on remote end")),
  79         OPT__FORCE(&force, N_("force overwrite of local branch")),
  80         OPT_BOOL('m', "multiple", &multiple,
  81                  N_("fetch from multiple remotes")),
  82         OPT_SET_INT('t', "tags", &tags,
  83                     N_("fetch all tags and associated objects"), TAGS_SET),
  84         OPT_SET_INT('n', NULL, &tags,
  85                     N_("do not fetch all tags (--no-tags)"), TAGS_UNSET),
  86         OPT_BOOL('p', "prune", &prune,
  87                  N_("prune remote-tracking branches no longer on remote")),
  88         { OPTION_CALLBACK, 0, "recurse-submodules", NULL, N_("on-demand"),
  89                     N_("control recursive fetching of submodules"),
  90                     PARSE_OPT_OPTARG, option_parse_recurse_submodules },
  91         OPT_BOOL(0, "dry-run", &dry_run,
  92                  N_("dry run")),
  93         OPT_BOOL('k', "keep", &keep, N_("keep downloaded pack")),
  94         OPT_BOOL('u', "update-head-ok", &update_head_ok,
  95                     N_("allow updating of HEAD ref")),
  96         OPT_BOOL(0, "progress", &progress, N_("force progress reporting")),
  97         OPT_STRING(0, "depth", &depth, N_("depth"),
  98                    N_("deepen history of shallow clone")),
  99         { OPTION_SET_INT, 0, "unshallow", &unshallow, NULL,
 100                    N_("convert to a complete repository"),
 101                    PARSE_OPT_NONEG | PARSE_OPT_NOARG, NULL, 1 },
 102         { OPTION_STRING, 0, "submodule-prefix", &submodule_prefix, N_("dir"),
 103                    N_("prepend this to submodule path output"), PARSE_OPT_HIDDEN },
 104         { OPTION_STRING, 0, "recurse-submodules-default",
 105                    &recurse_submodules_default, NULL,
 106                    N_("default mode for recursion"), PARSE_OPT_HIDDEN },
 107         OPT_END()
 108 };
 109
 110 static void unlock_pack(void)
 111 {
 112         if (gtransport)
 113                 transport_unlock_pack(gtransport);
 114         if (gsecondary)
 115                 transport_unlock_pack(gsecondary);
 116 }
 117
 118 static void unlock_pack_on_signal(int signo)
 119 {
 120         unlock_pack();
 121         sigchain_pop(signo);
 122         raise(signo);
 123 }
 124
 125 static void add_merge_config(struct ref **head,
 126                            const struct ref *remote_refs,
 127                            struct branch *branch,
 128                            struct ref ***tail)
 129 {
 130         int i;
 131
 132         for (i = 0; i < branch->merge_nr; i++) {
 133                 struct ref *rm, **old_tail = *tail;
 134                 struct refspec refspec;
 135
 136                 for (rm = *head; rm; rm = rm->next) {
 137                         if (branch_merge_matches(branch, i, rm->name)) {
 138                                 rm->fetch_head_status = FETCH_HEAD_MERGE;
 139                                 break;
 140                         }
 141                 }
 142                 if (rm)
 143                         continue;
 144
 145                 /*
 146                  * Not fetched to a remote-tracking branch?  We need to fetch
 147                  * it anyway to allow this branch's "branch.$name.merge"
 148                  * to be honored by 'git pull', but we do not have to
 149                  * fail if branch.$name.merge is misconfigured to point
 150                  * at a nonexisting branch.  If we were indeed called by
 151                  * 'git pull', it will notice the misconfiguration because
 152                  * there is no entry in the resulting FETCH_HEAD marked
 153                  * for merging.
 154                  */
 155                 memset(&refspec, 0, sizeof(refspec));
 156                 refspec.src = branch->merge[i]->src;
 157                 get_fetch_map(remote_refs, &refspec, tail, 1);
 158                 for (rm = *old_tail; rm; rm = rm->next)
 159                         rm->fetch_head_status = FETCH_HEAD_MERGE;
 160         }
 161 }
 162
 163 static void find_non_local_tags(struct transport *transport,
 164                         struct ref **head,
 165                         struct ref ***tail);
 166
 167 static struct ref *get_ref_map(struct transport *transport,
 168                                struct refspec *refs, int ref_count, int tags,
 169                                int *autotags)
 170 {
 171         int i;
 172         struct ref *rm;
 173         struct ref *ref_map = NULL;
 174         struct ref **tail = &ref_map;
 175
 176         const struct ref *remote_refs = transport_get_remote_refs(transport);
 177
 178         if (ref_count || tags == TAGS_SET) {
 179                 struct ref **old_tail;
 180
 181                 for (i = 0; i < ref_count; i++) {
 182                         get_fetch_map(remote_refs, &refs[i], &tail, 0);
 183                         if (refs[i].dst && refs[i].dst[0])
 184                                 *autotags = 1;
 185                 }
 186                 /* Merge everything on the command line, but not --tags */
 187                 for (rm = ref_map; rm; rm = rm->next)
 188                         rm->fetch_head_status = FETCH_HEAD_MERGE;
 189                 if (tags == TAGS_SET)
 190                         get_fetch_map(remote_refs, tag_refspec, &tail, 0);
 191
 192                 /*
 193                  * For any refs that we happen to be fetching via command-line
 194                  * arguments, take the opportunity to update their configured
 195                  * counterparts. However, we do not want to mention these
 196                  * entries in FETCH_HEAD at all, as they would simply be
 197                  * duplicates of existing entries.
 198                  */
 199                 old_tail = tail;
 200                 for (i = 0; i < transport->remote->fetch_refspec_nr; i++)
 201                         get_fetch_map(ref_map, &transport->remote->fetch[i],
 202                                       &tail, 1);
 203                 for (rm = *old_tail; rm; rm = rm->next)
 204                         rm->fetch_head_status = FETCH_HEAD_IGNORE;
 205         } else {
 206                 /* Use the defaults */
 207                 struct remote *remote = transport->remote;
 208                 struct branch *branch = branch_get(NULL);
 209                 int has_merge = branch_has_merge_config(branch);
 210                 if (remote &&
 211                     (remote->fetch_refspec_nr ||
 212                      /* Note: has_merge implies non-NULL branch->remote_name */
 213                      (has_merge && !strcmp(branch->remote_name, remote->name)))) {
 214                         for (i = 0; i < remote->fetch_refspec_nr; i++) {
 215                                 get_fetch_map(remote_refs, &remote->fetch[i], &tail, 0);
 216                                 if (remote->fetch[i].dst &&
 217                                     remote->fetch[i].dst[0])
 218                                         *autotags = 1;
 219                                 if (!i && !has_merge && ref_map &&
 220                                     !remote->fetch[0].pattern)
 221                                         ref_map->fetch_head_status = FETCH_HEAD_MERGE;
 222                         }
 223                         /*
 224                          * if the remote we're fetching from is the same
 225                          * as given in branch.<name>.remote, we add the
 226                          * ref given in branch.<name>.merge, too.
 227                          *
 228                          * Note: has_merge implies non-NULL branch->remote_name
 229                          */
 230                         if (has_merge &&
 231                             !strcmp(branch->remote_name, remote->name))
 232                                 add_merge_config(&ref_map, remote_refs, branch, &tail);
 233                 } else {
 234                         ref_map = get_remote_ref(remote_refs, "HEAD");
 235                         if (!ref_map)
 236                                 die(_("Couldn't find remote ref HEAD"));
 237                         ref_map->fetch_head_status = FETCH_HEAD_MERGE;
 238                         tail = &ref_map->next;
 239                 }
 240         }
 241         if (tags == TAGS_DEFAULT && *autotags)
 242                 find_non_local_tags(transport, &ref_map, &tail);
 243         ref_remove_duplicates(ref_map);
 244
 245         return ref_map;
 246 }
 247
 248 #define STORE_REF_ERROR_OTHER 1
 249 #define STORE_REF_ERROR_DF_CONFLICT 2
 250
 251 static int s_update_ref(const char *action,
 252                         struct ref *ref,
 253                         int check_old)
 254 {
 255         char msg[1024];
 256         char *rla = getenv("GIT_REFLOG_ACTION");
 257         static struct ref_lock *lock;
 258
 259         if (dry_run)
 260                 return 0;
 261         if (!rla)
 262                 rla = default_rla.buf;
 263         snprintf(msg, sizeof(msg), "%s: %s", rla, action);
 264         lock = lock_any_ref_for_update(ref->name,
 265                                        check_old ? ref->old_sha1 : NULL, 0);
 266         if (!lock)
 267                 return errno == ENOTDIR ? STORE_REF_ERROR_DF_CONFLICT :
 268                                           STORE_REF_ERROR_OTHER;
 269         if (write_ref_sha1(lock, ref->new_sha1, msg) < 0)
 270                 return errno == ENOTDIR ? STORE_REF_ERROR_DF_CONFLICT :
 271                                           STORE_REF_ERROR_OTHER;
 272         return 0;
 273 }
 274
 275 #define REFCOL_WIDTH  10
 276
 277 static int update_local_ref(struct ref *ref,
 278                             const char *remote,
 279                             const struct ref *remote_ref,
 280                             struct strbuf *display)
 281 {
 282         struct commit *current = NULL, *updated;
 283         enum object_type type;
 284         struct branch *current_branch = branch_get(NULL);
 285         const char *pretty_ref = prettify_refname(ref->name);
 286
 287         type = sha1_object_info(ref->new_sha1, NULL);
 288         if (type < 0)
 289                 die(_("object %s not found"), sha1_to_hex(ref->new_sha1));
 290
 291         if (!hashcmp(ref->old_sha1, ref->new_sha1)) {
 292                 if (verbosity > 0)
 293                         strbuf_addf(display, "= %-*s %-*s -> %s",
 294                                     TRANSPORT_SUMMARY(_("[up to date]")),
 295                                     REFCOL_WIDTH, remote, pretty_ref);
 296                 return 0;
 297         }
 298
 299         if (current_branch &&
 300             !strcmp(ref->name, current_branch->name) &&
 301             !(update_head_ok || is_bare_repository()) &&
 302             !is_null_sha1(ref->old_sha1)) {
 303                 /*
 304                  * If this is the head, and it's not okay to update
 305                  * the head, and the old value of the head isn't empty...
 306                  */
 307                 strbuf_addf(display,
 308                             _("! %-*s %-*s -> %s  (can't fetch in current branch)"),
 309                             TRANSPORT_SUMMARY(_("[rejected]")),
 310                             REFCOL_WIDTH, remote, pretty_ref);
 311                 return 1;
 312         }
 313
 314         if (!is_null_sha1(ref->old_sha1) &&
 315             !prefixcmp(ref->name, "refs/tags/")) {
 316                 int r;
 317                 r = s_update_ref("updating tag", ref, 0);
 318                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 319                             r ? '!' : '-',
 320                             TRANSPORT_SUMMARY(_("[tag update]")),
 321                             REFCOL_WIDTH, remote, pretty_ref,
 322                             r ? _("  (unable to update local ref)") : "");
 323                 return r;
 324         }
 325
 326         current = lookup_commit_reference_gently(ref->old_sha1, 1);
 327         updated = lookup_commit_reference_gently(ref->new_sha1, 1);
 328         if (!current || !updated) {
 329                 const char *msg;
 330                 const char *what;
 331                 int r;
 332                 /*
 333                  * Nicely describe the new ref we're fetching.
 334                  * Base this on the remote's ref name, as it's
 335                  * more likely to follow a standard layout.
 336                  */
 337                 const char *name = remote_ref ? remote_ref->name : "";
 338                 if (!prefixcmp(name, "refs/tags/")) {
 339                         msg = "storing tag";
 340                         what = _("[new tag]");
 341                 } else if (!prefixcmp(name, "refs/heads/")) {
 342                         msg = "storing head";
 343                         what = _("[new branch]");
 344                 } else {
 345                         msg = "storing ref";
 346                         what = _("[new ref]");
 347                 }
 348
 349                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 350                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 351                         check_for_new_submodule_commits(ref->new_sha1);
 352                 r = s_update_ref(msg, ref, 0);
 353                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 354                             r ? '!' : '*',
 355                             TRANSPORT_SUMMARY(what),
 356                             REFCOL_WIDTH, remote, pretty_ref,
 357                             r ? _("  (unable to update local ref)") : "");
 358                 return r;
 359         }
 360
 361         if (in_merge_bases(current, updated)) {
 362                 char quickref[83];
 363                 int r;
 364                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 365                 strcat(quickref, "..");
 366                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 367                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 368                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 369                         check_for_new_submodule_commits(ref->new_sha1);
 370                 r = s_update_ref("fast-forward", ref, 1);
 371                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 372                             r ? '!' : ' ',
 373                             TRANSPORT_SUMMARY_WIDTH, quickref,
 374                             REFCOL_WIDTH, remote, pretty_ref,
 375                             r ? _("  (unable to update local ref)") : "");
 376                 return r;
 377         } else if (force || ref->force) {
 378                 char quickref[84];
 379                 int r;
 380                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 381                 strcat(quickref, "...");
 382                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 383                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 384                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 385                         check_for_new_submodule_commits(ref->new_sha1);
 386                 r = s_update_ref("forced-update", ref, 1);
 387                 strbuf_addf(display, "%c %-*s %-*s -> %s  (%s)",
 388                             r ? '!' : '+',
 389                             TRANSPORT_SUMMARY_WIDTH, quickref,
 390                             REFCOL_WIDTH, remote, pretty_ref,
 391                             r ? _("unable to update local ref") : _("forced update"));
 392                 return r;
 393         } else {
 394                 strbuf_addf(display, "! %-*s %-*s -> %s  %s",
 395                             TRANSPORT_SUMMARY(_("[rejected]")),
 396                             REFCOL_WIDTH, remote, pretty_ref,
 397                             _("(non-fast-forward)"));
 398                 return 1;
 399         }
 400 }
 401
 402 static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
 403 {
 404         struct ref **rm = cb_data;
 405         struct ref *ref = *rm;
 406
 407         if (!ref)
 408                 return -1; /* end of the list */
 409         *rm = ref->next;
 410         hashcpy(sha1, ref->old_sha1);
 411         return 0;
 412 }
 413
 414 static int store_updated_refs(const char *raw_url, const char *remote_name,
 415                 struct ref *ref_map)
 416 {
 417         FILE *fp;
 418         struct commit *commit;
 419         int url_len, i, shown_url = 0, rc = 0;
 420         struct strbuf note = STRBUF_INIT;
 421         const char *what, *kind;
 422         struct ref *rm;
 423         char *url, *filename = dry_run ? "/dev/null" : git_path("FETCH_HEAD");
 424         int want_status;
 425
 426         fp = fopen(filename, "a");
 427         if (!fp)
 428                 return error(_("cannot open %s: %s\n"), filename, strerror(errno));
 429
 430         if (raw_url)
 431                 url = transport_anonymize_url(raw_url);
 432         else
 433                 url = xstrdup("foreign");
 434
 435         rm = ref_map;
 436         if (check_everything_connected(iterate_ref_map, 0, &rm)) {
 437                 rc = error(_("%s did not send all necessary objects\n"), url);
 438                 goto abort;
 439         }
 440
 441         /*
 442          * We do a pass for each fetch_head_status type in their enum order, so
 443          * merged entries are written before not-for-merge. That lets readers
 444          * use FETCH_HEAD as a refname to refer to the ref to be merged.
 445          */
 446         for (want_status = FETCH_HEAD_MERGE;
 447              want_status <= FETCH_HEAD_IGNORE;
 448              want_status++) {
 449                 for (rm = ref_map; rm; rm = rm->next) {
 450                         struct ref *ref = NULL;
 451                         const char *merge_status_marker = "";
 452
 453                         commit = lookup_commit_reference_gently(rm->old_sha1, 1);
 454                         if (!commit)
 455                                 rm->fetch_head_status = FETCH_HEAD_NOT_FOR_MERGE;
 456
 457                         if (rm->fetch_head_status != want_status)
 458                                 continue;
 459
 460                         if (rm->peer_ref) {
 461                                 ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
 462                                 strcpy(ref->name, rm->peer_ref->name);
 463                                 hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
 464                                 hashcpy(ref->new_sha1, rm->old_sha1);
 465                                 ref->force = rm->peer_ref->force;
 466                         }
 467
 468
 469                         if (!strcmp(rm->name, "HEAD")) {
 470                                 kind = "";
 471                                 what = "";
 472                         }
 473                         else if (!prefixcmp(rm->name, "refs/heads/")) {
 474                                 kind = "branch";
 475                                 what = rm->name + 11;
 476                         }
 477                         else if (!prefixcmp(rm->name, "refs/tags/")) {
 478                                 kind = "tag";
 479                                 what = rm->name + 10;
 480                         }
 481                         else if (!prefixcmp(rm->name, "refs/remotes/")) {
 482                                 kind = "remote-tracking branch";
 483                                 what = rm->name + 13;
 484                         }
 485                         else {
 486                                 kind = "";
 487                                 what = rm->name;
 488                         }
 489
 490                         url_len = strlen(url);
 491                         for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 492                                 ;
 493                         url_len = i + 1;
 494                         if (4 < i && !strncmp(".git", url + i - 3, 4))
 495                                 url_len = i - 3;
 496
 497                         strbuf_reset(&note);
 498                         if (*what) {
 499                                 if (*kind)
 500                                         strbuf_addf(&note, "%s ", kind);
 501                                 strbuf_addf(&note, "'%s' of ", what);
 502                         }
 503                         switch (rm->fetch_head_status) {
 504                         case FETCH_HEAD_NOT_FOR_MERGE:
 505                                 merge_status_marker = "not-for-merge";
 506                                 /* fall-through */
 507                         case FETCH_HEAD_MERGE:
 508                                 fprintf(fp, "%s\t%s\t%s",
 509                                         sha1_to_hex(rm->old_sha1),
 510                                         merge_status_marker,
 511                                         note.buf);
 512                                 for (i = 0; i < url_len; ++i)
 513                                         if ('\n' == url[i])
 514                                                 fputs("\\n", fp);
 515                                         else
 516                                                 fputc(url[i], fp);
 517                                 fputc('\n', fp);
 518                                 break;
 519                         default:
 520                                 /* do not write anything to FETCH_HEAD */
 521                                 break;
 522                         }
 523
 524                         strbuf_reset(&note);
 525                         if (ref) {
 526                                 rc |= update_local_ref(ref, what, rm, &note);
 527                                 free(ref);
 528                         } else
 529                                 strbuf_addf(&note, "* %-*s %-*s -> FETCH_HEAD",
 530                                             TRANSPORT_SUMMARY_WIDTH,
 531                                             *kind ? kind : "branch",
 532                                             REFCOL_WIDTH,
 533                                             *what ? what : "HEAD");
 534                         if (note.len) {
 535                                 if (verbosity >= 0 && !shown_url) {
 536                                         fprintf(stderr, _("From %.*s\n"),
 537                                                         url_len, url);
 538                                         shown_url = 1;
 539                                 }
 540                                 if (verbosity >= 0)
 541                                         fprintf(stderr, " %s\n", note.buf);
 542                         }
 543                 }
 544         }
 545
 546         if (rc & STORE_REF_ERROR_DF_CONFLICT)
 547                 error(_("some local refs could not be updated; try running\n"
 548                       " 'git remote prune %s' to remove any old, conflicting "
 549                       "branches"), remote_name);
 550
 551  abort:
 552         strbuf_release(&note);
 553         free(url);
 554         fclose(fp);
 555         return rc;
 556 }
 557
 558 /*
 559  * We would want to bypass the object transfer altogether if
 560  * everything we are going to fetch already exists and is connected
 561  * locally.
 562  */
 563 static int quickfetch(struct ref *ref_map)
 564 {
 565         struct ref *rm = ref_map;
 566
 567         /*
 568          * If we are deepening a shallow clone we already have these
 569          * objects reachable.  Running rev-list here will return with
 570          * a good (0) exit status and we'll bypass the fetch that we
 571          * really need to perform.  Claiming failure now will ensure
 572          * we perform the network exchange to deepen our history.
 573          */
 574         if (depth)
 575                 return -1;
 576         return check_everything_connected(iterate_ref_map, 1, &rm);
 577 }
 578
 579 static int fetch_refs(struct transport *transport, struct ref *ref_map)
 580 {
 581         int ret = quickfetch(ref_map);
 582         if (ret)
 583                 ret = transport_fetch_refs(transport, ref_map);
 584         if (!ret)
 585                 ret |= store_updated_refs(transport->url,
 586                                 transport->remote->name,
 587                                 ref_map);
 588         transport_unlock_pack(transport);
 589         return ret;
 590 }
 591
 592 static int prune_refs(struct refspec *refs, int ref_count, struct ref *ref_map)
 593 {
 594         int result = 0;
 595         struct ref *ref, *stale_refs = get_stale_heads(refs, ref_count, ref_map);
 596         const char *dangling_msg = dry_run
 597                 ? _("   (%s will become dangling)")
 598                 : _("   (%s has become dangling)");
 599
 600         for (ref = stale_refs; ref; ref = ref->next) {
 601                 if (!dry_run)
 602                         result |= delete_ref(ref->name, NULL, 0);
 603                 if (verbosity >= 0) {
 604                         fprintf(stderr, " x %-*s %-*s -> %s\n",
 605                                 TRANSPORT_SUMMARY(_("[deleted]")),
 606                                 REFCOL_WIDTH, _("(none)"), prettify_refname(ref->name));
 607                         warn_dangling_symref(stderr, dangling_msg, ref->name);
 608                 }
 609         }
 610         free_refs(stale_refs);
 611         return result;
 612 }
 613
 614 static int add_existing(const char *refname, const unsigned char *sha1,
 615                         int flag, void *cbdata)
 616 {
 617         struct string_list *list = (struct string_list *)cbdata;
 618         struct string_list_item *item = string_list_insert(list, refname);
 619         item->util = xmalloc(20);
 620         hashcpy(item->util, sha1);
 621         return 0;
 622 }
 623
 624 static int will_fetch(struct ref **head, const unsigned char *sha1)
 625 {
 626         struct ref *rm = *head;
 627         while (rm) {
 628                 if (!hashcmp(rm->old_sha1, sha1))
 629                         return 1;
 630                 rm = rm->next;
 631         }
 632         return 0;
 633 }
 634
 635 static void find_non_local_tags(struct transport *transport,
 636                         struct ref **head,
 637                         struct ref ***tail)
 638 {
 639         struct string_list existing_refs = STRING_LIST_INIT_DUP;
 640         struct string_list remote_refs = STRING_LIST_INIT_NODUP;
 641         const struct ref *ref;
 642         struct string_list_item *item = NULL;
 643
 644         for_each_ref(add_existing, &existing_refs);
 645         for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
 646                 if (prefixcmp(ref->name, "refs/tags/"))
 647                         continue;
 648
 649                 /*
 650                  * The peeled ref always follows the matching base
 651                  * ref, so if we see a peeled ref that we don't want
 652                  * to fetch then we can mark the ref entry in the list
 653                  * as one to ignore by setting util to NULL.
 654                  */
 655                 if (!suffixcmp(ref->name, "^{}")) {
 656                         if (item && !has_sha1_file(ref->old_sha1) &&
 657                             !will_fetch(head, ref->old_sha1) &&
 658                             !has_sha1_file(item->util) &&
 659                             !will_fetch(head, item->util))
 660                                 item->util = NULL;
 661                         item = NULL;
 662                         continue;
 663                 }
 664
 665                 /*
 666                  * If item is non-NULL here, then we previously saw a
 667                  * ref not followed by a peeled reference, so we need
 668                  * to check if it is a lightweight tag that we want to
 669                  * fetch.
 670                  */
 671                 if (item && !has_sha1_file(item->util) &&
 672                     !will_fetch(head, item->util))
 673                         item->util = NULL;
 674
 675                 item = NULL;
 676
 677                 /* skip duplicates and refs that we already have */
 678                 if (string_list_has_string(&remote_refs, ref->name) ||
 679                     string_list_has_string(&existing_refs, ref->name))
 680                         continue;
 681
 682                 item = string_list_insert(&remote_refs, ref->name);
 683                 item->util = (void *)ref->old_sha1;
 684         }
 685         string_list_clear(&existing_refs, 1);
 686
 687         /*
 688          * We may have a final lightweight tag that needs to be
 689          * checked to see if it needs fetching.
 690          */
 691         if (item && !has_sha1_file(item->util) &&
 692             !will_fetch(head, item->util))
 693                 item->util = NULL;
 694
 695         /*
 696          * For all the tags in the remote_refs string list,
 697          * add them to the list of refs to be fetched
 698          */
 699         for_each_string_list_item(item, &remote_refs) {
 700                 /* Unless we have already decided to ignore this item... */
 701                 if (item->util)
 702                 {
 703                         struct ref *rm = alloc_ref(item->string);
 704                         rm->peer_ref = alloc_ref(item->string);
 705                         hashcpy(rm->old_sha1, item->util);
 706                         **tail = rm;
 707                         *tail = &rm->next;
 708                 }
 709         }
 710
 711         string_list_clear(&remote_refs, 0);
 712 }
 713
 714 static void check_not_current_branch(struct ref *ref_map)
 715 {
 716         struct branch *current_branch = branch_get(NULL);
 717
 718         if (is_bare_repository() || !current_branch)
 719                 return;
 720
 721         for (; ref_map; ref_map = ref_map->next)
 722                 if (ref_map->peer_ref && !strcmp(current_branch->refname,
 723                                         ref_map->peer_ref->name))
 724                         die(_("Refusing to fetch into current branch %s "
 725                             "of non-bare repository"), current_branch->refname);
 726 }
 727
 728 static int truncate_fetch_head(void)
 729 {
 730         char *filename = git_path("FETCH_HEAD");
 731         FILE *fp = fopen(filename, "w");
 732
 733         if (!fp)
 734                 return error(_("cannot open %s: %s\n"), filename, strerror(errno));
 735         fclose(fp);
 736         return 0;
 737 }
 738
 739 static void set_option(struct transport *transport, const char *name, const char *value)
 740 {
 741         int r = transport_set_option(transport, name, value);
 742         if (r < 0)
 743                 die(_("Option \"%s\" value \"%s\" is not valid for %s"),
 744                     name, value, transport->url);
 745         if (r > 0)
 746                 warning(_("Option \"%s\" is ignored for %s\n"),
 747                         name, transport->url);
 748 }
 749
 750 static struct transport *prepare_transport(struct remote *remote)
 751 {
 752         struct transport *transport;
 753         transport = transport_get(remote, NULL);
 754         transport_set_verbosity(transport, verbosity, progress);
 755         if (upload_pack)
 756                 set_option(transport, TRANS_OPT_UPLOADPACK, upload_pack);
 757         if (keep)
 758                 set_option(transport, TRANS_OPT_KEEP, "yes");
 759         if (depth)
 760                 set_option(transport, TRANS_OPT_DEPTH, depth);
 761         return transport;
 762 }
 763
 764 static void backfill_tags(struct transport *transport, struct ref *ref_map)
 765 {
 766         if (transport->cannot_reuse) {
 767                 gsecondary = prepare_transport(transport->remote);
 768                 transport = gsecondary;
 769         }
 770
 771         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
 772         transport_set_option(transport, TRANS_OPT_DEPTH, "0");
 773         fetch_refs(transport, ref_map);
 774
 775         if (gsecondary) {
 776                 transport_disconnect(gsecondary);
 777                 gsecondary = NULL;
 778         }
 779 }
 780
 781 static int do_fetch(struct transport *transport,
 782                     struct refspec *refs, int ref_count)
 783 {
 784         struct string_list existing_refs = STRING_LIST_INIT_DUP;
 785         struct ref *ref_map;
 786         struct ref *rm;
 787         int autotags = (transport->remote->fetch_tags == 1);
 788         int retcode = 0;
 789
 790         for_each_ref(add_existing, &existing_refs);
 791
 792         if (tags == TAGS_DEFAULT) {
 793                 if (transport->remote->fetch_tags == 2)
 794                         tags = TAGS_SET;
 795                 if (transport->remote->fetch_tags == -1)
 796                         tags = TAGS_UNSET;
 797         }
 798
 799         if (!transport->get_refs_list || !transport->fetch)
 800                 die(_("Don't know how to fetch from %s"), transport->url);
 801
 802         /* if not appending, truncate FETCH_HEAD */
 803         if (!append && !dry_run) {
 804                 retcode = truncate_fetch_head();
 805                 if (retcode)
 806                         goto cleanup;
 807         }
 808
 809         ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
 810         if (!update_head_ok)
 811                 check_not_current_branch(ref_map);
 812
 813         for (rm = ref_map; rm; rm = rm->next) {
 814                 if (rm->peer_ref) {
 815                         struct string_list_item *peer_item =
 816                                 string_list_lookup(&existing_refs,
 817                                                    rm->peer_ref->name);
 818                         if (peer_item)
 819                                 hashcpy(rm->peer_ref->old_sha1,
 820                                         peer_item->util);
 821                 }
 822         }
 823
 824         if (tags == TAGS_DEFAULT && autotags)
 825                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
 826         if (fetch_refs(transport, ref_map)) {
 827                 free_refs(ref_map);
 828                 retcode = 1;
 829                 goto cleanup;
 830         }
 831         if (prune) {
 832                 /*
 833                  * If --tags was specified, pretend that the user gave us
 834                  * the canonical tags refspec
 835                  */
 836                 if (tags == TAGS_SET) {
 837                         const char *tags_str = "refs/tags/*:refs/tags/*";
 838                         struct refspec *tags_refspec, *refspec;
 839
 840                         /* Copy the refspec and add the tags to it */
 841                         refspec = xcalloc(ref_count + 1, sizeof(struct refspec));
 842                         tags_refspec = parse_fetch_refspec(1, &tags_str);
 843                         memcpy(refspec, refs, ref_count * sizeof(struct refspec));
 844                         memcpy(&refspec[ref_count], tags_refspec, sizeof(struct refspec));
 845                         ref_count++;
 846
 847                         prune_refs(refspec, ref_count, ref_map);
 848
 849                         ref_count--;
 850                         /* The rest of the strings belong to fetch_one */
 851                         free_refspec(1, tags_refspec);
 852                         free(refspec);
 853                 } else if (ref_count) {
 854                         prune_refs(refs, ref_count, ref_map);
 855                 } else {
 856                         prune_refs(transport->remote->fetch, transport->remote->fetch_refspec_nr, ref_map);
 857                 }
 858         }
 859         free_refs(ref_map);
 860
 861         /* if neither --no-tags nor --tags was specified, do automated tag
 862          * following ... */
 863         if (tags == TAGS_DEFAULT && autotags) {
 864                 struct ref **tail = &ref_map;
 865                 ref_map = NULL;
 866                 find_non_local_tags(transport, &ref_map, &tail);
 867                 if (ref_map)
 868                         backfill_tags(transport, ref_map);
 869                 free_refs(ref_map);
 870         }
 871
 872  cleanup:
 873         string_list_clear(&existing_refs, 1);
 874         return retcode;
 875 }
 876
 877 static int get_one_remote_for_fetch(struct remote *remote, void *priv)
 878 {
 879         struct string_list *list = priv;
 880         if (!remote->skip_default_update)
 881                 string_list_append(list, remote->name);
 882         return 0;
 883 }
 884
 885 struct remote_group_data {
 886         const char *name;
 887         struct string_list *list;
 888 };
 889
 890 static int get_remote_group(const char *key, const char *value, void *priv)
 891 {
 892         struct remote_group_data *g = priv;
 893
 894         if (!prefixcmp(key, "remotes.") &&
 895                         !strcmp(key + 8, g->name)) {
 896                 /* split list by white space */
 897                 int space = strcspn(value, " \t\n");
 898                 while (*value) {
 899                         if (space > 1) {
 900                                 string_list_append(g->list,
 901                                                    xstrndup(value, space));
 902                         }
 903                         value += space + (value[space] != '\0');
 904                         space = strcspn(value, " \t\n");
 905                 }
 906         }
 907
 908         return 0;
 909 }
 910
 911 static int add_remote_or_group(const char *name, struct string_list *list)
 912 {
 913         int prev_nr = list->nr;
 914         struct remote_group_data g;
 915         g.name = name; g.list = list;
 916
 917         git_config(get_remote_group, &g);
 918         if (list->nr == prev_nr) {
 919                 struct remote *remote;
 920                 if (!remote_is_configured(name))
 921                         return 0;
 922                 remote = remote_get(name);
 923                 string_list_append(list, remote->name);
 924         }
 925         return 1;
 926 }
 927
 928 static void add_options_to_argv(struct argv_array *argv)
 929 {
 930         if (dry_run)
 931                 argv_array_push(argv, "--dry-run");
 932         if (prune > 0)
 933                 argv_array_push(argv, "--prune");
 934         if (update_head_ok)
 935                 argv_array_push(argv, "--update-head-ok");
 936         if (force)
 937                 argv_array_push(argv, "--force");
 938         if (keep)
 939                 argv_array_push(argv, "--keep");
 940         if (recurse_submodules == RECURSE_SUBMODULES_ON)
 941                 argv_array_push(argv, "--recurse-submodules");
 942         else if (recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND)
 943                 argv_array_push(argv, "--recurse-submodules=on-demand");
 944         if (tags == TAGS_SET)
 945                 argv_array_push(argv, "--tags");
 946         else if (tags == TAGS_UNSET)
 947                 argv_array_push(argv, "--no-tags");
 948         if (verbosity >= 2)
 949                 argv_array_push(argv, "-v");
 950         if (verbosity >= 1)
 951                 argv_array_push(argv, "-v");
 952         else if (verbosity < 0)
 953                 argv_array_push(argv, "-q");
 954
 955 }
 956
 957 static int fetch_multiple(struct string_list *list)
 958 {
 959         int i, result = 0;
 960         struct argv_array argv = ARGV_ARRAY_INIT;
 961
 962         if (!append && !dry_run) {
 963                 int errcode = truncate_fetch_head();
 964                 if (errcode)
 965                         return errcode;
 966         }
 967
 968         argv_array_pushl(&argv, "fetch", "--append", NULL);
 969         add_options_to_argv(&argv);
 970
 971         for (i = 0; i < list->nr; i++) {
 972                 const char *name = list->items[i].string;
 973                 argv_array_push(&argv, name);
 974                 if (verbosity >= 0)
 975                         printf(_("Fetching %s\n"), name);
 976                 if (run_command_v_opt(argv.argv, RUN_GIT_CMD)) {
 977                         error(_("Could not fetch %s"), name);
 978                         result = 1;
 979                 }
 980                 argv_array_pop(&argv);
 981         }
 982
 983         argv_array_clear(&argv);
 984         return result;
 985 }
 986
 987 static int fetch_one(struct remote *remote, int argc, const char **argv)
 988 {
 989         int i;
 990         static const char **refs = NULL;
 991         struct refspec *refspec;
 992         int ref_nr = 0;
 993         int exit_code;
 994
 995         if (!remote)
 996                 die(_("No remote repository specified.  Please, specify either a URL or a\n"
 997                     "remote name from which new revisions should be fetched."));
 998
 999         gtransport = prepare_transport(remote);
1000
1001         if (prune < 0) {
1002                 /* no command line request */
1003                 if (0 <= gtransport->remote->prune)
1004                         prune = gtransport->remote->prune;
1005                 else if (0 <= fetch_prune_config)
1006                         prune = fetch_prune_config;
1007                 else
1008                         prune = PRUNE_BY_DEFAULT;
1009         }
1010
1011         if (argc > 0) {
1012                 int j = 0;
1013                 refs = xcalloc(argc + 1, sizeof(const char *));
1014                 for (i = 0; i < argc; i++) {
1015                         if (!strcmp(argv[i], "tag")) {
1016                                 char *ref;
1017                                 i++;
1018                                 if (i >= argc)
1019                                         die(_("You need to specify a tag name."));
1020                                 ref = xmalloc(strlen(argv[i]) * 2 + 22);
1021                                 strcpy(ref, "refs/tags/");
1022                                 strcat(ref, argv[i]);
1023                                 strcat(ref, ":refs/tags/");
1024                                 strcat(ref, argv[i]);
1025                                 refs[j++] = ref;
1026                         } else
1027                                 refs[j++] = argv[i];
1028                 }
1029                 refs[j] = NULL;
1030                 ref_nr = j;
1031         }
1032
1033         sigchain_push_common(unlock_pack_on_signal);
1034         atexit(unlock_pack);
1035         refspec = parse_fetch_refspec(ref_nr, refs);
1036         exit_code = do_fetch(gtransport, refspec, ref_nr);
1037         free_refspec(ref_nr, refspec);
1038         transport_disconnect(gtransport);
1039         gtransport = NULL;
1040         return exit_code;
1041 }
1042
1043 int cmd_fetch(int argc, const char **argv, const char *prefix)
1044 {
1045         int i;
1046         struct string_list list = STRING_LIST_INIT_NODUP;
1047         struct remote *remote;
1048         int result = 0;
1049         static const char *argv_gc_auto[] = {
1050                 "gc", "--auto", NULL,
1051         };
1052
1053         packet_trace_identity("fetch");
1054
1055         /* Record the command line for the reflog */
1056         strbuf_addstr(&default_rla, "fetch");
1057         for (i = 1; i < argc; i++)
1058                 strbuf_addf(&default_rla, " %s", argv[i]);
1059
1060         git_config(git_fetch_config, NULL);
1061
1062         argc = parse_options(argc, argv, prefix,
1063                              builtin_fetch_options, builtin_fetch_usage, 0);
1064
1065         if (unshallow) {
1066                 if (depth)
1067                         die(_("--depth and --unshallow cannot be used together"));
1068                 else if (!is_repository_shallow())
1069                         die(_("--unshallow on a complete repository does not make sense"));
1070                 else {
1071                         static char inf_depth[12];
1072                         sprintf(inf_depth, "%d", INFINITE_DEPTH);
1073                         depth = inf_depth;
1074                 }
1075         }
1076
1077         if (recurse_submodules != RECURSE_SUBMODULES_OFF) {
1078                 if (recurse_submodules_default) {
1079                         int arg = parse_fetch_recurse_submodules_arg("--recurse-submodules-default", recurse_submodules_default);
1080                         set_config_fetch_recurse_submodules(arg);
1081                 }
1082                 gitmodules_config();
1083                 git_config(submodule_config, NULL);
1084         }
1085
1086         if (all) {
1087                 if (argc == 1)
1088                         die(_("fetch --all does not take a repository argument"));
1089                 else if (argc > 1)
1090                         die(_("fetch --all does not make sense with refspecs"));
1091                 (void) for_each_remote(get_one_remote_for_fetch, &list);
1092                 result = fetch_multiple(&list);
1093         } else if (argc == 0) {
1094                 /* No arguments -- use default remote */
1095                 remote = remote_get(NULL);
1096                 result = fetch_one(remote, argc, argv);
1097         } else if (multiple) {
1098                 /* All arguments are assumed to be remotes or groups */
1099                 for (i = 0; i < argc; i++)
1100                         if (!add_remote_or_group(argv[i], &list))
1101                                 die(_("No such remote or remote group: %s"), argv[i]);
1102                 result = fetch_multiple(&list);
1103         } else {
1104                 /* Single remote or group */
1105                 (void) add_remote_or_group(argv[0], &list);
1106                 if (list.nr > 1) {
1107                         /* More than one remote */
1108                         if (argc > 1)
1109                                 die(_("Fetching a group and specifying refspecs does not make sense"));
1110                         result = fetch_multiple(&list);
1111                 } else {
1112                         /* Zero or one remotes */
1113                         remote = remote_get(argv[0]);
1114                         result = fetch_one(remote, argc-1, argv+1);
1115                 }
1116         }
1117
1118         if (!result && (recurse_submodules != RECURSE_SUBMODULES_OFF)) {
1119                 struct argv_array options = ARGV_ARRAY_INIT;
1120
1121                 add_options_to_argv(&options);
1122                 result = fetch_populated_submodules(&options,
1123                                                     submodule_prefix,
1124                                                     recurse_submodules,
1125                                                     verbosity < 0);
1126                 argv_array_clear(&options);
1127         }
1128
1129         /* All names were strdup()ed or strndup()ed */
1130         list.strdup_strings = 1;
1131         string_list_clear(&list, 0);
1132
1133         run_command_v_opt(argv_gc_auto, RUN_GIT_CMD);
1134
1135         return result;
1136 }