Pileus Git - ~andy/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, update_shallow;
  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_BOOL(0, "update-shallow", &update_shallow,
 108                  N_("accept refs that update .git/shallow")),
 109         OPT_END()
 110 };
 111
 112 static void unlock_pack(void)
 113 {
 114         if (gtransport)
 115                 transport_unlock_pack(gtransport);
 116         if (gsecondary)
 117                 transport_unlock_pack(gsecondary);
 118 }
 119
 120 static void unlock_pack_on_signal(int signo)
 121 {
 122         unlock_pack();
 123         sigchain_pop(signo);
 124         raise(signo);
 125 }
 126
 127 static void add_merge_config(struct ref **head,
 128                            const struct ref *remote_refs,
 129                            struct branch *branch,
 130                            struct ref ***tail)
 131 {
 132         int i;
 133
 134         for (i = 0; i < branch->merge_nr; i++) {
 135                 struct ref *rm, **old_tail = *tail;
 136                 struct refspec refspec;
 137
 138                 for (rm = *head; rm; rm = rm->next) {
 139                         if (branch_merge_matches(branch, i, rm->name)) {
 140                                 rm->fetch_head_status = FETCH_HEAD_MERGE;
 141                                 break;
 142                         }
 143                 }
 144                 if (rm)
 145                         continue;
 146
 147                 /*
 148                  * Not fetched to a remote-tracking branch?  We need to fetch
 149                  * it anyway to allow this branch's "branch.$name.merge"
 150                  * to be honored by 'git pull', but we do not have to
 151                  * fail if branch.$name.merge is misconfigured to point
 152                  * at a nonexisting branch.  If we were indeed called by
 153                  * 'git pull', it will notice the misconfiguration because
 154                  * there is no entry in the resulting FETCH_HEAD marked
 155                  * for merging.
 156                  */
 157                 memset(&refspec, 0, sizeof(refspec));
 158                 refspec.src = branch->merge[i]->src;
 159                 get_fetch_map(remote_refs, &refspec, tail, 1);
 160                 for (rm = *old_tail; rm; rm = rm->next)
 161                         rm->fetch_head_status = FETCH_HEAD_MERGE;
 162         }
 163 }
 164
 165 static void find_non_local_tags(struct transport *transport,
 166                         struct ref **head,
 167                         struct ref ***tail);
 168
 169 static struct ref *get_ref_map(struct transport *transport,
 170                                struct refspec *refs, int ref_count, int tags,
 171                                int *autotags)
 172 {
 173         int i;
 174         struct ref *rm;
 175         struct ref *ref_map = NULL;
 176         struct ref **tail = &ref_map;
 177
 178         const struct ref *remote_refs = transport_get_remote_refs(transport);
 179
 180         if (ref_count || tags == TAGS_SET) {
 181                 struct ref **old_tail;
 182
 183                 for (i = 0; i < ref_count; i++) {
 184                         get_fetch_map(remote_refs, &refs[i], &tail, 0);
 185                         if (refs[i].dst && refs[i].dst[0])
 186                                 *autotags = 1;
 187                 }
 188                 /* Merge everything on the command line, but not --tags */
 189                 for (rm = ref_map; rm; rm = rm->next)
 190                         rm->fetch_head_status = FETCH_HEAD_MERGE;
 191                 if (tags == TAGS_SET)
 192                         get_fetch_map(remote_refs, tag_refspec, &tail, 0);
 193
 194                 /*
 195                  * For any refs that we happen to be fetching via command-line
 196                  * arguments, take the opportunity to update their configured
 197                  * counterparts. However, we do not want to mention these
 198                  * entries in FETCH_HEAD at all, as they would simply be
 199                  * duplicates of existing entries.
 200                  */
 201                 old_tail = tail;
 202                 for (i = 0; i < transport->remote->fetch_refspec_nr; i++)
 203                         get_fetch_map(ref_map, &transport->remote->fetch[i],
 204                                       &tail, 1);
 205                 for (rm = *old_tail; rm; rm = rm->next)
 206                         rm->fetch_head_status = FETCH_HEAD_IGNORE;
 207         } else {
 208                 /* Use the defaults */
 209                 struct remote *remote = transport->remote;
 210                 struct branch *branch = branch_get(NULL);
 211                 int has_merge = branch_has_merge_config(branch);
 212                 if (remote &&
 213                     (remote->fetch_refspec_nr ||
 214                      /* Note: has_merge implies non-NULL branch->remote_name */
 215                      (has_merge && !strcmp(branch->remote_name, remote->name)))) {
 216                         for (i = 0; i < remote->fetch_refspec_nr; i++) {
 217                                 get_fetch_map(remote_refs, &remote->fetch[i], &tail, 0);
 218                                 if (remote->fetch[i].dst &&
 219                                     remote->fetch[i].dst[0])
 220                                         *autotags = 1;
 221                                 if (!i && !has_merge && ref_map &&
 222                                     !remote->fetch[0].pattern)
 223                                         ref_map->fetch_head_status = FETCH_HEAD_MERGE;
 224                         }
 225                         /*
 226                          * if the remote we're fetching from is the same
 227                          * as given in branch.<name>.remote, we add the
 228                          * ref given in branch.<name>.merge, too.
 229                          *
 230                          * Note: has_merge implies non-NULL branch->remote_name
 231                          */
 232                         if (has_merge &&
 233                             !strcmp(branch->remote_name, remote->name))
 234                                 add_merge_config(&ref_map, remote_refs, branch, &tail);
 235                 } else {
 236                         ref_map = get_remote_ref(remote_refs, "HEAD");
 237                         if (!ref_map)
 238                                 die(_("Couldn't find remote ref HEAD"));
 239                         ref_map->fetch_head_status = FETCH_HEAD_MERGE;
 240                         tail = &ref_map->next;
 241                 }
 242         }
 243         if (tags == TAGS_DEFAULT && *autotags)
 244                 find_non_local_tags(transport, &ref_map, &tail);
 245         ref_remove_duplicates(ref_map);
 246
 247         return ref_map;
 248 }
 249
 250 #define STORE_REF_ERROR_OTHER 1
 251 #define STORE_REF_ERROR_DF_CONFLICT 2
 252
 253 static int s_update_ref(const char *action,
 254                         struct ref *ref,
 255                         int check_old)
 256 {
 257         char msg[1024];
 258         char *rla = getenv("GIT_REFLOG_ACTION");
 259         static struct ref_lock *lock;
 260
 261         if (dry_run)
 262                 return 0;
 263         if (!rla)
 264                 rla = default_rla.buf;
 265         snprintf(msg, sizeof(msg), "%s: %s", rla, action);
 266         lock = lock_any_ref_for_update(ref->name,
 267                                        check_old ? ref->old_sha1 : NULL,
 268                                        0, NULL);
 269         if (!lock)
 270                 return errno == ENOTDIR ? STORE_REF_ERROR_DF_CONFLICT :
 271                                           STORE_REF_ERROR_OTHER;
 272         if (write_ref_sha1(lock, ref->new_sha1, msg) < 0)
 273                 return errno == ENOTDIR ? STORE_REF_ERROR_DF_CONFLICT :
 274                                           STORE_REF_ERROR_OTHER;
 275         return 0;
 276 }
 277
 278 #define REFCOL_WIDTH  10
 279
 280 static int update_local_ref(struct ref *ref,
 281                             const char *remote,
 282                             const struct ref *remote_ref,
 283                             struct strbuf *display)
 284 {
 285         struct commit *current = NULL, *updated;
 286         enum object_type type;
 287         struct branch *current_branch = branch_get(NULL);
 288         const char *pretty_ref = prettify_refname(ref->name);
 289
 290         type = sha1_object_info(ref->new_sha1, NULL);
 291         if (type < 0)
 292                 die(_("object %s not found"), sha1_to_hex(ref->new_sha1));
 293
 294         if (!hashcmp(ref->old_sha1, ref->new_sha1)) {
 295                 if (verbosity > 0)
 296                         strbuf_addf(display, "= %-*s %-*s -> %s",
 297                                     TRANSPORT_SUMMARY(_("[up to date]")),
 298                                     REFCOL_WIDTH, remote, pretty_ref);
 299                 return 0;
 300         }
 301
 302         if (current_branch &&
 303             !strcmp(ref->name, current_branch->name) &&
 304             !(update_head_ok || is_bare_repository()) &&
 305             !is_null_sha1(ref->old_sha1)) {
 306                 /*
 307                  * If this is the head, and it's not okay to update
 308                  * the head, and the old value of the head isn't empty...
 309                  */
 310                 strbuf_addf(display,
 311                             _("! %-*s %-*s -> %s  (can't fetch in current branch)"),
 312                             TRANSPORT_SUMMARY(_("[rejected]")),
 313                             REFCOL_WIDTH, remote, pretty_ref);
 314                 return 1;
 315         }
 316
 317         if (!is_null_sha1(ref->old_sha1) &&
 318             !prefixcmp(ref->name, "refs/tags/")) {
 319                 int r;
 320                 r = s_update_ref("updating tag", ref, 0);
 321                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 322                             r ? '!' : '-',
 323                             TRANSPORT_SUMMARY(_("[tag update]")),
 324                             REFCOL_WIDTH, remote, pretty_ref,
 325                             r ? _("  (unable to update local ref)") : "");
 326                 return r;
 327         }
 328
 329         current = lookup_commit_reference_gently(ref->old_sha1, 1);
 330         updated = lookup_commit_reference_gently(ref->new_sha1, 1);
 331         if (!current || !updated) {
 332                 const char *msg;
 333                 const char *what;
 334                 int r;
 335                 /*
 336                  * Nicely describe the new ref we're fetching.
 337                  * Base this on the remote's ref name, as it's
 338                  * more likely to follow a standard layout.
 339                  */
 340                 const char *name = remote_ref ? remote_ref->name : "";
 341                 if (!prefixcmp(name, "refs/tags/")) {
 342                         msg = "storing tag";
 343                         what = _("[new tag]");
 344                 } else if (!prefixcmp(name, "refs/heads/")) {
 345                         msg = "storing head";
 346                         what = _("[new branch]");
 347                 } else {
 348                         msg = "storing ref";
 349                         what = _("[new ref]");
 350                 }
 351
 352                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 353                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 354                         check_for_new_submodule_commits(ref->new_sha1);
 355                 r = s_update_ref(msg, ref, 0);
 356                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 357                             r ? '!' : '*',
 358                             TRANSPORT_SUMMARY(what),
 359                             REFCOL_WIDTH, remote, pretty_ref,
 360                             r ? _("  (unable to update local ref)") : "");
 361                 return r;
 362         }
 363
 364         if (in_merge_bases(current, updated)) {
 365                 char quickref[83];
 366                 int r;
 367                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 368                 strcat(quickref, "..");
 369                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 370                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 371                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 372                         check_for_new_submodule_commits(ref->new_sha1);
 373                 r = s_update_ref("fast-forward", ref, 1);
 374                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 375                             r ? '!' : ' ',
 376                             TRANSPORT_SUMMARY_WIDTH, quickref,
 377                             REFCOL_WIDTH, remote, pretty_ref,
 378                             r ? _("  (unable to update local ref)") : "");
 379                 return r;
 380         } else if (force || ref->force) {
 381                 char quickref[84];
 382                 int r;
 383                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 384                 strcat(quickref, "...");
 385                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 386                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 387                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 388                         check_for_new_submodule_commits(ref->new_sha1);
 389                 r = s_update_ref("forced-update", ref, 1);
 390                 strbuf_addf(display, "%c %-*s %-*s -> %s  (%s)",
 391                             r ? '!' : '+',
 392                             TRANSPORT_SUMMARY_WIDTH, quickref,
 393                             REFCOL_WIDTH, remote, pretty_ref,
 394                             r ? _("unable to update local ref") : _("forced update"));
 395                 return r;
 396         } else {
 397                 strbuf_addf(display, "! %-*s %-*s -> %s  %s",
 398                             TRANSPORT_SUMMARY(_("[rejected]")),
 399                             REFCOL_WIDTH, remote, pretty_ref,
 400                             _("(non-fast-forward)"));
 401                 return 1;
 402         }
 403 }
 404
 405 static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
 406 {
 407         struct ref **rm = cb_data;
 408         struct ref *ref = *rm;
 409
 410         while (ref && ref->status == REF_STATUS_REJECT_SHALLOW)
 411                 ref = ref->next;
 412         if (!ref)
 413                 return -1; /* end of the list */
 414         *rm = ref->next;
 415         hashcpy(sha1, ref->old_sha1);
 416         return 0;
 417 }
 418
 419 static int store_updated_refs(const char *raw_url, const char *remote_name,
 420                 struct ref *ref_map)
 421 {
 422         FILE *fp;
 423         struct commit *commit;
 424         int url_len, i, shown_url = 0, rc = 0;
 425         struct strbuf note = STRBUF_INIT;
 426         const char *what, *kind;
 427         struct ref *rm;
 428         char *url, *filename = dry_run ? "/dev/null" : git_path("FETCH_HEAD");
 429         int want_status;
 430
 431         fp = fopen(filename, "a");
 432         if (!fp)
 433                 return error(_("cannot open %s: %s\n"), filename, strerror(errno));
 434
 435         if (raw_url)
 436                 url = transport_anonymize_url(raw_url);
 437         else
 438                 url = xstrdup("foreign");
 439
 440         rm = ref_map;
 441         if (check_everything_connected(iterate_ref_map, 0, &rm)) {
 442                 rc = error(_("%s did not send all necessary objects\n"), url);
 443                 goto abort;
 444         }
 445
 446         /*
 447          * We do a pass for each fetch_head_status type in their enum order, so
 448          * merged entries are written before not-for-merge. That lets readers
 449          * use FETCH_HEAD as a refname to refer to the ref to be merged.
 450          */
 451         for (want_status = FETCH_HEAD_MERGE;
 452              want_status <= FETCH_HEAD_IGNORE;
 453              want_status++) {
 454                 for (rm = ref_map; rm; rm = rm->next) {
 455                         struct ref *ref = NULL;
 456                         const char *merge_status_marker = "";
 457
 458                         if (rm->status == REF_STATUS_REJECT_SHALLOW) {
 459                                 if (want_status == FETCH_HEAD_MERGE)
 460                                         warning(_("reject %s because shallow roots are not allowed to be updated"),
 461                                                 rm->peer_ref ? rm->peer_ref->name : rm->name);
 462                                 continue;
 463                         }
 464
 465                         commit = lookup_commit_reference_gently(rm->old_sha1, 1);
 466                         if (!commit)
 467                                 rm->fetch_head_status = FETCH_HEAD_NOT_FOR_MERGE;
 468
 469                         if (rm->fetch_head_status != want_status)
 470                                 continue;
 471
 472                         if (rm->peer_ref) {
 473                                 ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
 474                                 strcpy(ref->name, rm->peer_ref->name);
 475                                 hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
 476                                 hashcpy(ref->new_sha1, rm->old_sha1);
 477                                 ref->force = rm->peer_ref->force;
 478                         }
 479
 480
 481                         if (!strcmp(rm->name, "HEAD")) {
 482                                 kind = "";
 483                                 what = "";
 484                         }
 485                         else if (!prefixcmp(rm->name, "refs/heads/")) {
 486                                 kind = "branch";
 487                                 what = rm->name + 11;
 488                         }
 489                         else if (!prefixcmp(rm->name, "refs/tags/")) {
 490                                 kind = "tag";
 491                                 what = rm->name + 10;
 492                         }
 493                         else if (!prefixcmp(rm->name, "refs/remotes/")) {
 494                                 kind = "remote-tracking branch";
 495                                 what = rm->name + 13;
 496                         }
 497                         else {
 498                                 kind = "";
 499                                 what = rm->name;
 500                         }
 501
 502                         url_len = strlen(url);
 503                         for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 504                                 ;
 505                         url_len = i + 1;
 506                         if (4 < i && !strncmp(".git", url + i - 3, 4))
 507                                 url_len = i - 3;
 508
 509                         strbuf_reset(&note);
 510                         if (*what) {
 511                                 if (*kind)
 512                                         strbuf_addf(&note, "%s ", kind);
 513                                 strbuf_addf(&note, "'%s' of ", what);
 514                         }
 515                         switch (rm->fetch_head_status) {
 516                         case FETCH_HEAD_NOT_FOR_MERGE:
 517                                 merge_status_marker = "not-for-merge";
 518                                 /* fall-through */
 519                         case FETCH_HEAD_MERGE:
 520                                 fprintf(fp, "%s\t%s\t%s",
 521                                         sha1_to_hex(rm->old_sha1),
 522                                         merge_status_marker,
 523                                         note.buf);
 524                                 for (i = 0; i < url_len; ++i)
 525                                         if ('\n' == url[i])
 526                                                 fputs("\\n", fp);
 527                                         else
 528                                                 fputc(url[i], fp);
 529                                 fputc('\n', fp);
 530                                 break;
 531                         default:
 532                                 /* do not write anything to FETCH_HEAD */
 533                                 break;
 534                         }
 535
 536                         strbuf_reset(&note);
 537                         if (ref) {
 538                                 rc |= update_local_ref(ref, what, rm, &note);
 539                                 free(ref);
 540                         } else
 541                                 strbuf_addf(&note, "* %-*s %-*s -> FETCH_HEAD",
 542                                             TRANSPORT_SUMMARY_WIDTH,
 543                                             *kind ? kind : "branch",
 544                                             REFCOL_WIDTH,
 545                                             *what ? what : "HEAD");
 546                         if (note.len) {
 547                                 if (verbosity >= 0 && !shown_url) {
 548                                         fprintf(stderr, _("From %.*s\n"),
 549                                                         url_len, url);
 550                                         shown_url = 1;
 551                                 }
 552                                 if (verbosity >= 0)
 553                                         fprintf(stderr, " %s\n", note.buf);
 554                         }
 555                 }
 556         }
 557
 558         if (rc & STORE_REF_ERROR_DF_CONFLICT)
 559                 error(_("some local refs could not be updated; try running\n"
 560                       " 'git remote prune %s' to remove any old, conflicting "
 561                       "branches"), remote_name);
 562
 563  abort:
 564         strbuf_release(&note);
 565         free(url);
 566         fclose(fp);
 567         return rc;
 568 }
 569
 570 /*
 571  * We would want to bypass the object transfer altogether if
 572  * everything we are going to fetch already exists and is connected
 573  * locally.
 574  */
 575 static int quickfetch(struct ref *ref_map)
 576 {
 577         struct ref *rm = ref_map;
 578
 579         /*
 580          * If we are deepening a shallow clone we already have these
 581          * objects reachable.  Running rev-list here will return with
 582          * a good (0) exit status and we'll bypass the fetch that we
 583          * really need to perform.  Claiming failure now will ensure
 584          * we perform the network exchange to deepen our history.
 585          */
 586         if (depth)
 587                 return -1;
 588         return check_everything_connected(iterate_ref_map, 1, &rm);
 589 }
 590
 591 static int fetch_refs(struct transport *transport, struct ref *ref_map)
 592 {
 593         int ret = quickfetch(ref_map);
 594         if (ret)
 595                 ret = transport_fetch_refs(transport, ref_map);
 596         if (!ret)
 597                 ret |= store_updated_refs(transport->url,
 598                                 transport->remote->name,
 599                                 ref_map);
 600         transport_unlock_pack(transport);
 601         return ret;
 602 }
 603
 604 static int prune_refs(struct refspec *refs, int ref_count, struct ref *ref_map)
 605 {
 606         int result = 0;
 607         struct ref *ref, *stale_refs = get_stale_heads(refs, ref_count, ref_map);
 608         const char *dangling_msg = dry_run
 609                 ? _("   (%s will become dangling)")
 610                 : _("   (%s has become dangling)");
 611
 612         for (ref = stale_refs; ref; ref = ref->next) {
 613                 if (!dry_run)
 614                         result |= delete_ref(ref->name, NULL, 0);
 615                 if (verbosity >= 0) {
 616                         fprintf(stderr, " x %-*s %-*s -> %s\n",
 617                                 TRANSPORT_SUMMARY(_("[deleted]")),
 618                                 REFCOL_WIDTH, _("(none)"), prettify_refname(ref->name));
 619                         warn_dangling_symref(stderr, dangling_msg, ref->name);
 620                 }
 621         }
 622         free_refs(stale_refs);
 623         return result;
 624 }
 625
 626 static int add_existing(const char *refname, const unsigned char *sha1,
 627                         int flag, void *cbdata)
 628 {
 629         struct string_list *list = (struct string_list *)cbdata;
 630         struct string_list_item *item = string_list_insert(list, refname);
 631         item->util = xmalloc(20);
 632         hashcpy(item->util, sha1);
 633         return 0;
 634 }
 635
 636 static int will_fetch(struct ref **head, const unsigned char *sha1)
 637 {
 638         struct ref *rm = *head;
 639         while (rm) {
 640                 if (!hashcmp(rm->old_sha1, sha1))
 641                         return 1;
 642                 rm = rm->next;
 643         }
 644         return 0;
 645 }
 646
 647 static void find_non_local_tags(struct transport *transport,
 648                         struct ref **head,
 649                         struct ref ***tail)
 650 {
 651         struct string_list existing_refs = STRING_LIST_INIT_DUP;
 652         struct string_list remote_refs = STRING_LIST_INIT_NODUP;
 653         const struct ref *ref;
 654         struct string_list_item *item = NULL;
 655
 656         for_each_ref(add_existing, &existing_refs);
 657         for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
 658                 if (prefixcmp(ref->name, "refs/tags/"))
 659                         continue;
 660
 661                 /*
 662                  * The peeled ref always follows the matching base
 663                  * ref, so if we see a peeled ref that we don't want
 664                  * to fetch then we can mark the ref entry in the list
 665                  * as one to ignore by setting util to NULL.
 666                  */
 667                 if (!suffixcmp(ref->name, "^{}")) {
 668                         if (item && !has_sha1_file(ref->old_sha1) &&
 669                             !will_fetch(head, ref->old_sha1) &&
 670                             !has_sha1_file(item->util) &&
 671                             !will_fetch(head, item->util))
 672                                 item->util = NULL;
 673                         item = NULL;
 674                         continue;
 675                 }
 676
 677                 /*
 678                  * If item is non-NULL here, then we previously saw a
 679                  * ref not followed by a peeled reference, so we need
 680                  * to check if it is a lightweight tag that we want to
 681                  * fetch.
 682                  */
 683                 if (item && !has_sha1_file(item->util) &&
 684                     !will_fetch(head, item->util))
 685                         item->util = NULL;
 686
 687                 item = NULL;
 688
 689                 /* skip duplicates and refs that we already have */
 690                 if (string_list_has_string(&remote_refs, ref->name) ||
 691                     string_list_has_string(&existing_refs, ref->name))
 692                         continue;
 693
 694                 item = string_list_insert(&remote_refs, ref->name);
 695                 item->util = (void *)ref->old_sha1;
 696         }
 697         string_list_clear(&existing_refs, 1);
 698
 699         /*
 700          * We may have a final lightweight tag that needs to be
 701          * checked to see if it needs fetching.
 702          */
 703         if (item && !has_sha1_file(item->util) &&
 704             !will_fetch(head, item->util))
 705                 item->util = NULL;
 706
 707         /*
 708          * For all the tags in the remote_refs string list,
 709          * add them to the list of refs to be fetched
 710          */
 711         for_each_string_list_item(item, &remote_refs) {
 712                 /* Unless we have already decided to ignore this item... */
 713                 if (item->util)
 714                 {
 715                         struct ref *rm = alloc_ref(item->string);
 716                         rm->peer_ref = alloc_ref(item->string);
 717                         hashcpy(rm->old_sha1, item->util);
 718                         **tail = rm;
 719                         *tail = &rm->next;
 720                 }
 721         }
 722
 723         string_list_clear(&remote_refs, 0);
 724 }
 725
 726 static void check_not_current_branch(struct ref *ref_map)
 727 {
 728         struct branch *current_branch = branch_get(NULL);
 729
 730         if (is_bare_repository() || !current_branch)
 731                 return;
 732
 733         for (; ref_map; ref_map = ref_map->next)
 734                 if (ref_map->peer_ref && !strcmp(current_branch->refname,
 735                                         ref_map->peer_ref->name))
 736                         die(_("Refusing to fetch into current branch %s "
 737                             "of non-bare repository"), current_branch->refname);
 738 }
 739
 740 static int truncate_fetch_head(void)
 741 {
 742         char *filename = git_path("FETCH_HEAD");
 743         FILE *fp = fopen(filename, "w");
 744
 745         if (!fp)
 746                 return error(_("cannot open %s: %s\n"), filename, strerror(errno));
 747         fclose(fp);
 748         return 0;
 749 }
 750
 751 static void set_option(struct transport *transport, const char *name, const char *value)
 752 {
 753         int r = transport_set_option(transport, name, value);
 754         if (r < 0)
 755                 die(_("Option \"%s\" value \"%s\" is not valid for %s"),
 756                     name, value, transport->url);
 757         if (r > 0)
 758                 warning(_("Option \"%s\" is ignored for %s\n"),
 759                         name, transport->url);
 760 }
 761
 762 static struct transport *prepare_transport(struct remote *remote)
 763 {
 764         struct transport *transport;
 765         transport = transport_get(remote, NULL);
 766         transport_set_verbosity(transport, verbosity, progress);
 767         if (upload_pack)
 768                 set_option(transport, TRANS_OPT_UPLOADPACK, upload_pack);
 769         if (keep)
 770                 set_option(transport, TRANS_OPT_KEEP, "yes");
 771         if (depth)
 772                 set_option(transport, TRANS_OPT_DEPTH, depth);
 773         if (update_shallow)
 774                 set_option(transport, TRANS_OPT_UPDATE_SHALLOW, "yes");
 775         return transport;
 776 }
 777
 778 static void backfill_tags(struct transport *transport, struct ref *ref_map)
 779 {
 780         if (transport->cannot_reuse) {
 781                 gsecondary = prepare_transport(transport->remote);
 782                 transport = gsecondary;
 783         }
 784
 785         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
 786         transport_set_option(transport, TRANS_OPT_DEPTH, "0");
 787         fetch_refs(transport, ref_map);
 788
 789         if (gsecondary) {
 790                 transport_disconnect(gsecondary);
 791                 gsecondary = NULL;
 792         }
 793 }
 794
 795 static int do_fetch(struct transport *transport,
 796                     struct refspec *refs, int ref_count)
 797 {
 798         struct string_list existing_refs = STRING_LIST_INIT_DUP;
 799         struct ref *ref_map;
 800         struct ref *rm;
 801         int autotags = (transport->remote->fetch_tags == 1);
 802         int retcode = 0;
 803
 804         for_each_ref(add_existing, &existing_refs);
 805
 806         if (tags == TAGS_DEFAULT) {
 807                 if (transport->remote->fetch_tags == 2)
 808                         tags = TAGS_SET;
 809                 if (transport->remote->fetch_tags == -1)
 810                         tags = TAGS_UNSET;
 811         }
 812
 813         if (!transport->get_refs_list || !transport->fetch)
 814                 die(_("Don't know how to fetch from %s"), transport->url);
 815
 816         /* if not appending, truncate FETCH_HEAD */
 817         if (!append && !dry_run) {
 818                 retcode = truncate_fetch_head();
 819                 if (retcode)
 820                         goto cleanup;
 821         }
 822
 823         ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
 824         if (!update_head_ok)
 825                 check_not_current_branch(ref_map);
 826
 827         for (rm = ref_map; rm; rm = rm->next) {
 828                 if (rm->peer_ref) {
 829                         struct string_list_item *peer_item =
 830                                 string_list_lookup(&existing_refs,
 831                                                    rm->peer_ref->name);
 832                         if (peer_item)
 833                                 hashcpy(rm->peer_ref->old_sha1,
 834                                         peer_item->util);
 835                 }
 836         }
 837
 838         if (tags == TAGS_DEFAULT && autotags)
 839                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
 840         if (fetch_refs(transport, ref_map)) {
 841                 free_refs(ref_map);
 842                 retcode = 1;
 843                 goto cleanup;
 844         }
 845         if (prune) {
 846                 /*
 847                  * If --tags was specified, pretend that the user gave us
 848                  * the canonical tags refspec
 849                  */
 850                 if (tags == TAGS_SET) {
 851                         const char *tags_str = "refs/tags/*:refs/tags/*";
 852                         struct refspec *tags_refspec, *refspec;
 853
 854                         /* Copy the refspec and add the tags to it */
 855                         refspec = xcalloc(ref_count + 1, sizeof(struct refspec));
 856                         tags_refspec = parse_fetch_refspec(1, &tags_str);
 857                         memcpy(refspec, refs, ref_count * sizeof(struct refspec));
 858                         memcpy(&refspec[ref_count], tags_refspec, sizeof(struct refspec));
 859                         ref_count++;
 860
 861                         prune_refs(refspec, ref_count, ref_map);
 862
 863                         ref_count--;
 864                         /* The rest of the strings belong to fetch_one */
 865                         free_refspec(1, tags_refspec);
 866                         free(refspec);
 867                 } else if (ref_count) {
 868                         prune_refs(refs, ref_count, ref_map);
 869                 } else {
 870                         prune_refs(transport->remote->fetch, transport->remote->fetch_refspec_nr, ref_map);
 871                 }
 872         }
 873         free_refs(ref_map);
 874
 875         /* if neither --no-tags nor --tags was specified, do automated tag
 876          * following ... */
 877         if (tags == TAGS_DEFAULT && autotags) {
 878                 struct ref **tail = &ref_map;
 879                 ref_map = NULL;
 880                 find_non_local_tags(transport, &ref_map, &tail);
 881                 if (ref_map)
 882                         backfill_tags(transport, ref_map);
 883                 free_refs(ref_map);
 884         }
 885
 886  cleanup:
 887         string_list_clear(&existing_refs, 1);
 888         return retcode;
 889 }
 890
 891 static int get_one_remote_for_fetch(struct remote *remote, void *priv)
 892 {
 893         struct string_list *list = priv;
 894         if (!remote->skip_default_update)
 895                 string_list_append(list, remote->name);
 896         return 0;
 897 }
 898
 899 struct remote_group_data {
 900         const char *name;
 901         struct string_list *list;
 902 };
 903
 904 static int get_remote_group(const char *key, const char *value, void *priv)
 905 {
 906         struct remote_group_data *g = priv;
 907
 908         if (!prefixcmp(key, "remotes.") &&
 909                         !strcmp(key + 8, g->name)) {
 910                 /* split list by white space */
 911                 int space = strcspn(value, " \t\n");
 912                 while (*value) {
 913                         if (space > 1) {
 914                                 string_list_append(g->list,
 915                                                    xstrndup(value, space));
 916                         }
 917                         value += space + (value[space] != '\0');
 918                         space = strcspn(value, " \t\n");
 919                 }
 920         }
 921
 922         return 0;
 923 }
 924
 925 static int add_remote_or_group(const char *name, struct string_list *list)
 926 {
 927         int prev_nr = list->nr;
 928         struct remote_group_data g;
 929         g.name = name; g.list = list;
 930
 931         git_config(get_remote_group, &g);
 932         if (list->nr == prev_nr) {
 933                 struct remote *remote;
 934                 if (!remote_is_configured(name))
 935                         return 0;
 936                 remote = remote_get(name);
 937                 string_list_append(list, remote->name);
 938         }
 939         return 1;
 940 }
 941
 942 static void add_options_to_argv(struct argv_array *argv)
 943 {
 944         if (dry_run)
 945                 argv_array_push(argv, "--dry-run");
 946         if (prune > 0)
 947                 argv_array_push(argv, "--prune");
 948         if (update_head_ok)
 949                 argv_array_push(argv, "--update-head-ok");
 950         if (force)
 951                 argv_array_push(argv, "--force");
 952         if (keep)
 953                 argv_array_push(argv, "--keep");
 954         if (recurse_submodules == RECURSE_SUBMODULES_ON)
 955                 argv_array_push(argv, "--recurse-submodules");
 956         else if (recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND)
 957                 argv_array_push(argv, "--recurse-submodules=on-demand");
 958         if (tags == TAGS_SET)
 959                 argv_array_push(argv, "--tags");
 960         else if (tags == TAGS_UNSET)
 961                 argv_array_push(argv, "--no-tags");
 962         if (verbosity >= 2)
 963                 argv_array_push(argv, "-v");
 964         if (verbosity >= 1)
 965                 argv_array_push(argv, "-v");
 966         else if (verbosity < 0)
 967                 argv_array_push(argv, "-q");
 968
 969 }
 970
 971 static int fetch_multiple(struct string_list *list)
 972 {
 973         int i, result = 0;
 974         struct argv_array argv = ARGV_ARRAY_INIT;
 975
 976         if (!append && !dry_run) {
 977                 int errcode = truncate_fetch_head();
 978                 if (errcode)
 979                         return errcode;
 980         }
 981
 982         argv_array_pushl(&argv, "fetch", "--append", NULL);
 983         add_options_to_argv(&argv);
 984
 985         for (i = 0; i < list->nr; i++) {
 986                 const char *name = list->items[i].string;
 987                 argv_array_push(&argv, name);
 988                 if (verbosity >= 0)
 989                         printf(_("Fetching %s\n"), name);
 990                 if (run_command_v_opt(argv.argv, RUN_GIT_CMD)) {
 991                         error(_("Could not fetch %s"), name);
 992                         result = 1;
 993                 }
 994                 argv_array_pop(&argv);
 995         }
 996
 997         argv_array_clear(&argv);
 998         return result;
 999 }
1000
1001 static int fetch_one(struct remote *remote, int argc, const char **argv)
1002 {
1003         int i;
1004         static const char **refs = NULL;
1005         struct refspec *refspec;
1006         int ref_nr = 0;
1007         int exit_code;
1008
1009         if (!remote)
1010                 die(_("No remote repository specified.  Please, specify either a URL or a\n"
1011                     "remote name from which new revisions should be fetched."));
1012
1013         gtransport = prepare_transport(remote);
1014
1015         if (prune < 0) {
1016                 /* no command line request */
1017                 if (0 <= gtransport->remote->prune)
1018                         prune = gtransport->remote->prune;
1019                 else if (0 <= fetch_prune_config)
1020                         prune = fetch_prune_config;
1021                 else
1022                         prune = PRUNE_BY_DEFAULT;
1023         }
1024
1025         if (argc > 0) {
1026                 int j = 0;
1027                 refs = xcalloc(argc + 1, sizeof(const char *));
1028                 for (i = 0; i < argc; i++) {
1029                         if (!strcmp(argv[i], "tag")) {
1030                                 char *ref;
1031                                 i++;
1032                                 if (i >= argc)
1033                                         die(_("You need to specify a tag name."));
1034                                 ref = xmalloc(strlen(argv[i]) * 2 + 22);
1035                                 strcpy(ref, "refs/tags/");
1036                                 strcat(ref, argv[i]);
1037                                 strcat(ref, ":refs/tags/");
1038                                 strcat(ref, argv[i]);
1039                                 refs[j++] = ref;
1040                         } else
1041                                 refs[j++] = argv[i];
1042                 }
1043                 refs[j] = NULL;
1044                 ref_nr = j;
1045         }
1046
1047         sigchain_push_common(unlock_pack_on_signal);
1048         atexit(unlock_pack);
1049         refspec = parse_fetch_refspec(ref_nr, refs);
1050         exit_code = do_fetch(gtransport, refspec, ref_nr);
1051         free_refspec(ref_nr, refspec);
1052         transport_disconnect(gtransport);
1053         gtransport = NULL;
1054         return exit_code;
1055 }
1056
1057 int cmd_fetch(int argc, const char **argv, const char *prefix)
1058 {
1059         int i;
1060         struct string_list list = STRING_LIST_INIT_NODUP;
1061         struct remote *remote;
1062         int result = 0;
1063         static const char *argv_gc_auto[] = {
1064                 "gc", "--auto", NULL,
1065         };
1066
1067         packet_trace_identity("fetch");
1068
1069         /* Record the command line for the reflog */
1070         strbuf_addstr(&default_rla, "fetch");
1071         for (i = 1; i < argc; i++)
1072                 strbuf_addf(&default_rla, " %s", argv[i]);
1073
1074         git_config(git_fetch_config, NULL);
1075
1076         argc = parse_options(argc, argv, prefix,
1077                              builtin_fetch_options, builtin_fetch_usage, 0);
1078
1079         if (unshallow) {
1080                 if (depth)
1081                         die(_("--depth and --unshallow cannot be used together"));
1082                 else if (!is_repository_shallow())
1083                         die(_("--unshallow on a complete repository does not make sense"));
1084                 else {
1085                         static char inf_depth[12];
1086                         sprintf(inf_depth, "%d", INFINITE_DEPTH);
1087                         depth = inf_depth;
1088                 }
1089         }
1090
1091         if (recurse_submodules != RECURSE_SUBMODULES_OFF) {
1092                 if (recurse_submodules_default) {
1093                         int arg = parse_fetch_recurse_submodules_arg("--recurse-submodules-default", recurse_submodules_default);
1094                         set_config_fetch_recurse_submodules(arg);
1095                 }
1096                 gitmodules_config();
1097                 git_config(submodule_config, NULL);
1098         }
1099
1100         if (all) {
1101                 if (argc == 1)
1102                         die(_("fetch --all does not take a repository argument"));
1103                 else if (argc > 1)
1104                         die(_("fetch --all does not make sense with refspecs"));
1105                 (void) for_each_remote(get_one_remote_for_fetch, &list);
1106                 result = fetch_multiple(&list);
1107         } else if (argc == 0) {
1108                 /* No arguments -- use default remote */
1109                 remote = remote_get(NULL);
1110                 result = fetch_one(remote, argc, argv);
1111         } else if (multiple) {
1112                 /* All arguments are assumed to be remotes or groups */
1113                 for (i = 0; i < argc; i++)
1114                         if (!add_remote_or_group(argv[i], &list))
1115                                 die(_("No such remote or remote group: %s"), argv[i]);
1116                 result = fetch_multiple(&list);
1117         } else {
1118                 /* Single remote or group */
1119                 (void) add_remote_or_group(argv[0], &list);
1120                 if (list.nr > 1) {
1121                         /* More than one remote */
1122                         if (argc > 1)
1123                                 die(_("Fetching a group and specifying refspecs does not make sense"));
1124                         result = fetch_multiple(&list);
1125                 } else {
1126                         /* Zero or one remotes */
1127                         remote = remote_get(argv[0]);
1128                         result = fetch_one(remote, argc-1, argv+1);
1129                 }
1130         }
1131
1132         if (!result && (recurse_submodules != RECURSE_SUBMODULES_OFF)) {
1133                 struct argv_array options = ARGV_ARRAY_INIT;
1134
1135                 add_options_to_argv(&options);
1136                 result = fetch_populated_submodules(&options,
1137                                                     submodule_prefix,
1138                                                     recurse_submodules,
1139                                                     verbosity < 0);
1140                 argv_array_clear(&options);
1141         }
1142
1143         /* All names were strdup()ed or strndup()ed */
1144         list.strdup_strings = 1;
1145         string_list_clear(&list, 0);
1146
1147         run_command_v_opt(argv_gc_auto, RUN_GIT_CMD);
1148
1149         return result;
1150 }