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