builtin/clone.c

   1 /*
   2  * Builtin "git clone"
   3  *
   4  * Copyright (c) 2007 Kristian Høgsberg <krh@redhat.com>,
   5  *               2008 Daniel Barkalow <barkalow@iabervon.org>
   6  * Based on git-commit.sh by Junio C Hamano and Linus Torvalds
   7  *
   8  * Clone a repository into a different directory that does not yet exist.
   9  */
  10
  11 #define USE_THE_INDEX_COMPATIBILITY_MACROS
  12 #include "builtin.h"
  13 #include "config.h"
  14 #include "lockfile.h"
  15 #include "parse-options.h"
  16 #include "fetch-pack.h"
  17 #include "refs.h"
  18 #include "refspec.h"
  19 #include "object-store.h"
  20 #include "tree.h"
  21 #include "tree-walk.h"
  22 #include "unpack-trees.h"
  23 #include "transport.h"
  24 #include "strbuf.h"
  25 #include "dir.h"
  26 #include "dir-iterator.h"
  27 #include "iterator.h"
  28 #include "sigchain.h"
  29 #include "branch.h"
  30 #include "remote.h"
  31 #include "run-command.h"
  32 #include "connected.h"
  33 #include "packfile.h"
  34 #include "list-objects-filter-options.h"
  35
  36 /*
  37  * Overall FIXMEs:
  38  *  - respect DB_ENVIRONMENT for .git/objects.
  39  *
  40  * Implementation notes:
  41  *  - dropping use-separate-remote and no-separate-remote compatibility
  42  *
  43  */
  44 static const char * const builtin_clone_usage[] = {
  45         N_("git clone [<options>] [--] <repo> [<dir>]"),
  46         NULL
  47 };
  48
  49 static int option_no_checkout, option_bare, option_mirror, option_single_branch = -1;
  50 static int option_local = -1, option_no_hardlinks, option_shared;
  51 static int option_no_tags;
  52 static int option_shallow_submodules;
  53 static int option_reject_shallow = -1;    /* unspecified */
  54 static int config_reject_shallow = -1;    /* unspecified */
  55 static int deepen;
  56 static char *option_template, *option_depth, *option_since;
  57 static char *option_origin = NULL;
  58 static char *remote_name = NULL;
  59 static char *option_branch = NULL;
  60 static struct string_list option_not = STRING_LIST_INIT_NODUP;
  61 static const char *real_git_dir;
  62 static char *option_upload_pack = "git-upload-pack";
  63 static int option_verbosity;
  64 static int option_progress = -1;
  65 static int option_sparse_checkout;
  66 static enum transport_family family;
  67 static struct string_list option_config = STRING_LIST_INIT_NODUP;
  68 static struct string_list option_required_reference = STRING_LIST_INIT_NODUP;
  69 static struct string_list option_optional_reference = STRING_LIST_INIT_NODUP;
  70 static int option_dissociate;
  71 static int max_jobs = -1;
  72 static struct string_list option_recurse_submodules = STRING_LIST_INIT_NODUP;
  73 static struct list_objects_filter_options filter_options;
  74 static struct string_list server_options = STRING_LIST_INIT_NODUP;
  75 static int option_remote_submodules;
  76
  77 static int recurse_submodules_cb(const struct option *opt,
  78                                  const char *arg, int unset)
  79 {
  80         if (unset)
  81                 string_list_clear((struct string_list *)opt->value, 0);
  82         else if (arg)
  83                 string_list_append((struct string_list *)opt->value, arg);
  84         else
  85                 string_list_append((struct string_list *)opt->value,
  86                                    (const char *)opt->defval);
  87
  88         return 0;
  89 }
  90
  91 static struct option builtin_clone_options[] = {
  92         OPT__VERBOSITY(&option_verbosity),
  93         OPT_BOOL(0, "progress", &option_progress,
  94                  N_("force progress reporting")),
  95         OPT_BOOL(0, "reject-shallow", &option_reject_shallow,
  96                  N_("don't clone shallow repository")),
  97         OPT_BOOL('n', "no-checkout", &option_no_checkout,
  98                  N_("don't create a checkout")),
  99         OPT_BOOL(0, "bare", &option_bare, N_("create a bare repository")),
 100         OPT_HIDDEN_BOOL(0, "naked", &option_bare,
 101                         N_("create a bare repository")),
 102         OPT_BOOL(0, "mirror", &option_mirror,
 103                  N_("create a mirror repository (implies bare)")),
 104         OPT_BOOL('l', "local", &option_local,
 105                 N_("to clone from a local repository")),
 106         OPT_BOOL(0, "no-hardlinks", &option_no_hardlinks,
 107                     N_("don't use local hardlinks, always copy")),
 108         OPT_BOOL('s', "shared", &option_shared,
 109                     N_("setup as shared repository")),
 110         { OPTION_CALLBACK, 0, "recurse-submodules", &option_recurse_submodules,
 111           N_("pathspec"), N_("initialize submodules in the clone"),
 112           PARSE_OPT_OPTARG, recurse_submodules_cb, (intptr_t)"." },
 113         OPT_ALIAS(0, "recursive", "recurse-submodules"),
 114         OPT_INTEGER('j', "jobs", &max_jobs,
 115                     N_("number of submodules cloned in parallel")),
 116         OPT_STRING(0, "template", &option_template, N_("template-directory"),
 117                    N_("directory from which templates will be used")),
 118         OPT_STRING_LIST(0, "reference", &option_required_reference, N_("repo"),
 119                         N_("reference repository")),
 120         OPT_STRING_LIST(0, "reference-if-able", &option_optional_reference,
 121                         N_("repo"), N_("reference repository")),
 122         OPT_BOOL(0, "dissociate", &option_dissociate,
 123                  N_("use --reference only while cloning")),
 124         OPT_STRING('o', "origin", &option_origin, N_("name"),
 125                    N_("use <name> instead of 'origin' to track upstream")),
 126         OPT_STRING('b', "branch", &option_branch, N_("branch"),
 127                    N_("checkout <branch> instead of the remote's HEAD")),
 128         OPT_STRING('u', "upload-pack", &option_upload_pack, N_("path"),
 129                    N_("path to git-upload-pack on the remote")),
 130         OPT_STRING(0, "depth", &option_depth, N_("depth"),
 131                     N_("create a shallow clone of that depth")),
 132         OPT_STRING(0, "shallow-since", &option_since, N_("time"),
 133                     N_("create a shallow clone since a specific time")),
 134         OPT_STRING_LIST(0, "shallow-exclude", &option_not, N_("revision"),
 135                         N_("deepen history of shallow clone, excluding rev")),
 136         OPT_BOOL(0, "single-branch", &option_single_branch,
 137                     N_("clone only one branch, HEAD or --branch")),
 138         OPT_BOOL(0, "no-tags", &option_no_tags,
 139                  N_("don't clone any tags, and make later fetches not to follow them")),
 140         OPT_BOOL(0, "shallow-submodules", &option_shallow_submodules,
 141                     N_("any cloned submodules will be shallow")),
 142         OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
 143                    N_("separate git dir from working tree")),
 144         OPT_STRING_LIST('c', "config", &option_config, N_("key=value"),
 145                         N_("set config inside the new repository")),
 146         OPT_STRING_LIST(0, "server-option", &server_options,
 147                         N_("server-specific"), N_("option to transmit")),
 148         OPT_SET_INT('4', "ipv4", &family, N_("use IPv4 addresses only"),
 149                         TRANSPORT_FAMILY_IPV4),
 150         OPT_SET_INT('6', "ipv6", &family, N_("use IPv6 addresses only"),
 151                         TRANSPORT_FAMILY_IPV6),
 152         OPT_PARSE_LIST_OBJECTS_FILTER(&filter_options),
 153         OPT_BOOL(0, "remote-submodules", &option_remote_submodules,
 154                     N_("any cloned submodules will use their remote-tracking branch")),
 155         OPT_BOOL(0, "sparse", &option_sparse_checkout,
 156                     N_("initialize sparse-checkout file to include only files at root")),
 157         OPT_END()
 158 };
 159
 160 static const char *get_repo_path_1(struct strbuf *path, int *is_bundle)
 161 {
 162         static char *suffix[] = { "/.git", "", ".git/.git", ".git" };
 163         static char *bundle_suffix[] = { ".bundle", "" };
 164         size_t baselen = path->len;
 165         struct stat st;
 166         int i;
 167
 168         for (i = 0; i < ARRAY_SIZE(suffix); i++) {
 169                 strbuf_setlen(path, baselen);
 170                 strbuf_addstr(path, suffix[i]);
 171                 if (stat(path->buf, &st))
 172                         continue;
 173                 if (S_ISDIR(st.st_mode) && is_git_directory(path->buf)) {
 174                         *is_bundle = 0;
 175                         return path->buf;
 176                 } else if (S_ISREG(st.st_mode) && st.st_size > 8) {
 177                         /* Is it a "gitfile"? */
 178                         char signature[8];
 179                         const char *dst;
 180                         int len, fd = open(path->buf, O_RDONLY);
 181                         if (fd < 0)
 182                                 continue;
 183                         len = read_in_full(fd, signature, 8);
 184                         close(fd);
 185                         if (len != 8 || strncmp(signature, "gitdir: ", 8))
 186                                 continue;
 187                         dst = read_gitfile(path->buf);
 188                         if (dst) {
 189                                 *is_bundle = 0;
 190                                 return dst;
 191                         }
 192                 }
 193         }
 194
 195         for (i = 0; i < ARRAY_SIZE(bundle_suffix); i++) {
 196                 strbuf_setlen(path, baselen);
 197                 strbuf_addstr(path, bundle_suffix[i]);
 198                 if (!stat(path->buf, &st) && S_ISREG(st.st_mode)) {
 199                         *is_bundle = 1;
 200                         return path->buf;
 201                 }
 202         }
 203
 204         return NULL;
 205 }
 206
 207 static char *get_repo_path(const char *repo, int *is_bundle)
 208 {
 209         struct strbuf path = STRBUF_INIT;
 210         const char *raw;
 211         char *canon;
 212
 213         strbuf_addstr(&path, repo);
 214         raw = get_repo_path_1(&path, is_bundle);
 215         canon = raw ? absolute_pathdup(raw) : NULL;
 216         strbuf_release(&path);
 217         return canon;
 218 }
 219
 220 static char *guess_dir_name(const char *repo, int is_bundle, int is_bare)
 221 {
 222         const char *end = repo + strlen(repo), *start, *ptr;
 223         size_t len;
 224         char *dir;
 225
 226         /*
 227          * Skip scheme.
 228          */
 229         start = strstr(repo, "://");
 230         if (start == NULL)
 231                 start = repo;
 232         else
 233                 start += 3;
 234
 235         /*
 236          * Skip authentication data. The stripping does happen
 237          * greedily, such that we strip up to the last '@' inside
 238          * the host part.
 239          */
 240         for (ptr = start; ptr < end && !is_dir_sep(*ptr); ptr++) {
 241                 if (*ptr == '@')
 242                         start = ptr + 1;
 243         }
 244
 245         /*
 246          * Strip trailing spaces, slashes and /.git
 247          */
 248         while (start < end && (is_dir_sep(end[-1]) || isspace(end[-1])))
 249                 end--;
 250         if (end - start > 5 && is_dir_sep(end[-5]) &&
 251             !strncmp(end - 4, ".git", 4)) {
 252                 end -= 5;
 253                 while (start < end && is_dir_sep(end[-1]))
 254                         end--;
 255         }
 256
 257         /*
 258          * Strip trailing port number if we've got only a
 259          * hostname (that is, there is no dir separator but a
 260          * colon). This check is required such that we do not
 261          * strip URI's like '/foo/bar:2222.git', which should
 262          * result in a dir '2222' being guessed due to backwards
 263          * compatibility.
 264          */
 265         if (memchr(start, '/', end - start) == NULL
 266             && memchr(start, ':', end - start) != NULL) {
 267                 ptr = end;
 268                 while (start < ptr && isdigit(ptr[-1]) && ptr[-1] != ':')
 269                         ptr--;
 270                 if (start < ptr && ptr[-1] == ':')
 271                         end = ptr - 1;
 272         }
 273
 274         /*
 275          * Find last component. To remain backwards compatible we
 276          * also regard colons as path separators, such that
 277          * cloning a repository 'foo:bar.git' would result in a
 278          * directory 'bar' being guessed.
 279          */
 280         ptr = end;
 281         while (start < ptr && !is_dir_sep(ptr[-1]) && ptr[-1] != ':')
 282                 ptr--;
 283         start = ptr;
 284
 285         /*
 286          * Strip .{bundle,git}.
 287          */
 288         len = end - start;
 289         strip_suffix_mem(start, &len, is_bundle ? ".bundle" : ".git");
 290
 291         if (!len || (len == 1 && *start == '/'))
 292                 die(_("No directory name could be guessed.\n"
 293                       "Please specify a directory on the command line"));
 294
 295         if (is_bare)
 296                 dir = xstrfmt("%.*s.git", (int)len, start);
 297         else
 298                 dir = xstrndup(start, len);
 299         /*
 300          * Replace sequences of 'control' characters and whitespace
 301          * with one ascii space, remove leading and trailing spaces.
 302          */
 303         if (*dir) {
 304                 char *out = dir;
 305                 int prev_space = 1 /* strip leading whitespace */;
 306                 for (end = dir; *end; ++end) {
 307                         char ch = *end;
 308                         if ((unsigned char)ch < '\x20')
 309                                 ch = '\x20';
 310                         if (isspace(ch)) {
 311                                 if (prev_space)
 312                                         continue;
 313                                 prev_space = 1;
 314                         } else
 315                                 prev_space = 0;
 316                         *out++ = ch;
 317                 }
 318                 *out = '\0';
 319                 if (out > dir && prev_space)
 320                         out[-1] = '\0';
 321         }
 322         return dir;
 323 }
 324
 325 static void strip_trailing_slashes(char *dir)
 326 {
 327         char *end = dir + strlen(dir);
 328
 329         while (dir < end - 1 && is_dir_sep(end[-1]))
 330                 end--;
 331         *end = '\0';
 332 }
 333
 334 static int add_one_reference(struct string_list_item *item, void *cb_data)
 335 {
 336         struct strbuf err = STRBUF_INIT;
 337         int *required = cb_data;
 338         char *ref_git = compute_alternate_path(item->string, &err);
 339
 340         if (!ref_git) {
 341                 if (*required)
 342                         die("%s", err.buf);
 343                 else
 344                         fprintf(stderr,
 345                                 _("info: Could not add alternate for '%s': %s\n"),
 346                                 item->string, err.buf);
 347         } else {
 348                 struct strbuf sb = STRBUF_INIT;
 349                 strbuf_addf(&sb, "%s/objects", ref_git);
 350                 add_to_alternates_file(sb.buf);
 351                 strbuf_release(&sb);
 352         }
 353
 354         strbuf_release(&err);
 355         free(ref_git);
 356         return 0;
 357 }
 358
 359 static void setup_reference(void)
 360 {
 361         int required = 1;
 362         for_each_string_list(&option_required_reference,
 363                              add_one_reference, &required);
 364         required = 0;
 365         for_each_string_list(&option_optional_reference,
 366                              add_one_reference, &required);
 367 }
 368
 369 static void copy_alternates(struct strbuf *src, const char *src_repo)
 370 {
 371         /*
 372          * Read from the source objects/info/alternates file
 373          * and copy the entries to corresponding file in the
 374          * destination repository with add_to_alternates_file().
 375          * Both src and dst have "$path/objects/info/alternates".
 376          *
 377          * Instead of copying bit-for-bit from the original,
 378          * we need to append to existing one so that the already
 379          * created entry via "clone -s" is not lost, and also
 380          * to turn entries with paths relative to the original
 381          * absolute, so that they can be used in the new repository.
 382          */
 383         FILE *in = xfopen(src->buf, "r");
 384         struct strbuf line = STRBUF_INIT;
 385
 386         while (strbuf_getline(&line, in) != EOF) {
 387                 char *abs_path;
 388                 if (!line.len || line.buf[0] == '#')
 389                         continue;
 390                 if (is_absolute_path(line.buf)) {
 391                         add_to_alternates_file(line.buf);
 392                         continue;
 393                 }
 394                 abs_path = mkpathdup("%s/objects/%s", src_repo, line.buf);
 395                 if (!normalize_path_copy(abs_path, abs_path))
 396                         add_to_alternates_file(abs_path);
 397                 else
 398                         warning("skipping invalid relative alternate: %s/%s",
 399                                 src_repo, line.buf);
 400                 free(abs_path);
 401         }
 402         strbuf_release(&line);
 403         fclose(in);
 404 }
 405
 406 static void mkdir_if_missing(const char *pathname, mode_t mode)
 407 {
 408         struct stat st;
 409
 410         if (!mkdir(pathname, mode))
 411                 return;
 412
 413         if (errno != EEXIST)
 414                 die_errno(_("failed to create directory '%s'"), pathname);
 415         else if (stat(pathname, &st))
 416                 die_errno(_("failed to stat '%s'"), pathname);
 417         else if (!S_ISDIR(st.st_mode))
 418                 die(_("%s exists and is not a directory"), pathname);
 419 }
 420
 421 static void copy_or_link_directory(struct strbuf *src, struct strbuf *dest,
 422                                    const char *src_repo)
 423 {
 424         int src_len, dest_len;
 425         struct dir_iterator *iter;
 426         int iter_status;
 427         unsigned int flags;
 428         struct strbuf realpath = STRBUF_INIT;
 429
 430         mkdir_if_missing(dest->buf, 0777);
 431
 432         flags = DIR_ITERATOR_PEDANTIC | DIR_ITERATOR_FOLLOW_SYMLINKS;
 433         iter = dir_iterator_begin(src->buf, flags);
 434
 435         if (!iter)
 436                 die_errno(_("failed to start iterator over '%s'"), src->buf);
 437
 438         strbuf_addch(src, '/');
 439         src_len = src->len;
 440         strbuf_addch(dest, '/');
 441         dest_len = dest->len;
 442
 443         while ((iter_status = dir_iterator_advance(iter)) == ITER_OK) {
 444                 strbuf_setlen(src, src_len);
 445                 strbuf_addstr(src, iter->relative_path);
 446                 strbuf_setlen(dest, dest_len);
 447                 strbuf_addstr(dest, iter->relative_path);
 448
 449                 if (S_ISDIR(iter->st.st_mode)) {
 450                         mkdir_if_missing(dest->buf, 0777);
 451                         continue;
 452                 }
 453
 454                 /* Files that cannot be copied bit-for-bit... */
 455                 if (!fspathcmp(iter->relative_path, "info/alternates")) {
 456                         copy_alternates(src, src_repo);
 457                         continue;
 458                 }
 459
 460                 if (unlink(dest->buf) && errno != ENOENT)
 461                         die_errno(_("failed to unlink '%s'"), dest->buf);
 462                 if (!option_no_hardlinks) {
 463                         strbuf_realpath(&realpath, src->buf, 1);
 464                         if (!link(realpath.buf, dest->buf))
 465                                 continue;
 466                         if (option_local > 0)
 467                                 die_errno(_("failed to create link '%s'"), dest->buf);
 468                         option_no_hardlinks = 1;
 469                 }
 470                 if (copy_file_with_time(dest->buf, src->buf, 0666))
 471                         die_errno(_("failed to copy file to '%s'"), dest->buf);
 472         }
 473
 474         if (iter_status != ITER_DONE) {
 475                 strbuf_setlen(src, src_len);
 476                 die(_("failed to iterate over '%s'"), src->buf);
 477         }
 478
 479         strbuf_release(&realpath);
 480 }
 481
 482 static void clone_local(const char *src_repo, const char *dest_repo)
 483 {
 484         if (option_shared) {
 485                 struct strbuf alt = STRBUF_INIT;
 486                 get_common_dir(&alt, src_repo);
 487                 strbuf_addstr(&alt, "/objects");
 488                 add_to_alternates_file(alt.buf);
 489                 strbuf_release(&alt);
 490         } else {
 491                 struct strbuf src = STRBUF_INIT;
 492                 struct strbuf dest = STRBUF_INIT;
 493                 get_common_dir(&src, src_repo);
 494                 get_common_dir(&dest, dest_repo);
 495                 strbuf_addstr(&src, "/objects");
 496                 strbuf_addstr(&dest, "/objects");
 497                 copy_or_link_directory(&src, &dest, src_repo);
 498                 strbuf_release(&src);
 499                 strbuf_release(&dest);
 500         }
 501
 502         if (0 <= option_verbosity)
 503                 fprintf(stderr, _("done.\n"));
 504 }
 505
 506 static const char *junk_work_tree;
 507 static int junk_work_tree_flags;
 508 static const char *junk_git_dir;
 509 static int junk_git_dir_flags;
 510 static enum {
 511         JUNK_LEAVE_NONE,
 512         JUNK_LEAVE_REPO,
 513         JUNK_LEAVE_ALL
 514 } junk_mode = JUNK_LEAVE_NONE;
 515
 516 static const char junk_leave_repo_msg[] =
 517 N_("Clone succeeded, but checkout failed.\n"
 518    "You can inspect what was checked out with 'git status'\n"
 519    "and retry with 'git restore --source=HEAD :/'\n");
 520
 521 static void remove_junk(void)
 522 {
 523         struct strbuf sb = STRBUF_INIT;
 524
 525         switch (junk_mode) {
 526         case JUNK_LEAVE_REPO:
 527                 warning("%s", _(junk_leave_repo_msg));
 528                 /* fall-through */
 529         case JUNK_LEAVE_ALL:
 530                 return;
 531         default:
 532                 /* proceed to removal */
 533                 break;
 534         }
 535
 536         if (junk_git_dir) {
 537                 strbuf_addstr(&sb, junk_git_dir);
 538                 remove_dir_recursively(&sb, junk_git_dir_flags);
 539                 strbuf_reset(&sb);
 540         }
 541         if (junk_work_tree) {
 542                 strbuf_addstr(&sb, junk_work_tree);
 543                 remove_dir_recursively(&sb, junk_work_tree_flags);
 544         }
 545         strbuf_release(&sb);
 546 }
 547
 548 static void remove_junk_on_signal(int signo)
 549 {
 550         remove_junk();
 551         sigchain_pop(signo);
 552         raise(signo);
 553 }
 554
 555 static struct ref *find_remote_branch(const struct ref *refs, const char *branch)
 556 {
 557         struct ref *ref;
 558         struct strbuf head = STRBUF_INIT;
 559         strbuf_addstr(&head, "refs/heads/");
 560         strbuf_addstr(&head, branch);
 561         ref = find_ref_by_name(refs, head.buf);
 562         strbuf_release(&head);
 563
 564         if (ref)
 565                 return ref;
 566
 567         strbuf_addstr(&head, "refs/tags/");
 568         strbuf_addstr(&head, branch);
 569         ref = find_ref_by_name(refs, head.buf);
 570         strbuf_release(&head);
 571
 572         return ref;
 573 }
 574
 575 static struct ref *wanted_peer_refs(const struct ref *refs,
 576                 struct refspec *refspec)
 577 {
 578         struct ref *head = copy_ref(find_ref_by_name(refs, "HEAD"));
 579         struct ref *local_refs = head;
 580         struct ref **tail = head ? &head->next : &local_refs;
 581
 582         if (option_single_branch) {
 583                 struct ref *remote_head = NULL;
 584
 585                 if (!option_branch)
 586                         remote_head = guess_remote_head(head, refs, 0);
 587                 else {
 588                         local_refs = NULL;
 589                         tail = &local_refs;
 590                         remote_head = copy_ref(find_remote_branch(refs, option_branch));
 591                 }
 592
 593                 if (!remote_head && option_branch)
 594                         warning(_("Could not find remote branch %s to clone."),
 595                                 option_branch);
 596                 else {
 597                         int i;
 598                         for (i = 0; i < refspec->nr; i++)
 599                                 get_fetch_map(remote_head, &refspec->items[i],
 600                                               &tail, 0);
 601
 602                         /* if --branch=tag, pull the requested tag explicitly */
 603                         get_fetch_map(remote_head, tag_refspec, &tail, 0);
 604                 }
 605         } else {
 606                 int i;
 607                 for (i = 0; i < refspec->nr; i++)
 608                         get_fetch_map(refs, &refspec->items[i], &tail, 0);
 609         }
 610
 611         if (!option_mirror && !option_single_branch && !option_no_tags)
 612                 get_fetch_map(refs, tag_refspec, &tail, 0);
 613
 614         return local_refs;
 615 }
 616
 617 static void write_remote_refs(const struct ref *local_refs)
 618 {
 619         const struct ref *r;
 620
 621         struct ref_transaction *t;
 622         struct strbuf err = STRBUF_INIT;
 623
 624         t = ref_transaction_begin(&err);
 625         if (!t)
 626                 die("%s", err.buf);
 627
 628         for (r = local_refs; r; r = r->next) {
 629                 if (!r->peer_ref)
 630                         continue;
 631                 if (ref_transaction_create(t, r->peer_ref->name, &r->old_oid,
 632                                            0, NULL, &err))
 633                         die("%s", err.buf);
 634         }
 635
 636         if (initial_ref_transaction_commit(t, &err))
 637                 die("%s", err.buf);
 638
 639         strbuf_release(&err);
 640         ref_transaction_free(t);
 641 }
 642
 643 static void write_followtags(const struct ref *refs, const char *msg)
 644 {
 645         const struct ref *ref;
 646         for (ref = refs; ref; ref = ref->next) {
 647                 if (!starts_with(ref->name, "refs/tags/"))
 648                         continue;
 649                 if (ends_with(ref->name, "^{}"))
 650                         continue;
 651                 if (!has_object_file_with_flags(&ref->old_oid,
 652                                                 OBJECT_INFO_QUICK |
 653                                                 OBJECT_INFO_SKIP_FETCH_OBJECT))
 654                         continue;
 655                 update_ref(msg, ref->name, &ref->old_oid, NULL, 0,
 656                            UPDATE_REFS_DIE_ON_ERR);
 657         }
 658 }
 659
 660 static int iterate_ref_map(void *cb_data, struct object_id *oid)
 661 {
 662         struct ref **rm = cb_data;
 663         struct ref *ref = *rm;
 664
 665         /*
 666          * Skip anything missing a peer_ref, which we are not
 667          * actually going to write a ref for.
 668          */
 669         while (ref && !ref->peer_ref)
 670                 ref = ref->next;
 671         /* Returning -1 notes "end of list" to the caller. */
 672         if (!ref)
 673                 return -1;
 674
 675         oidcpy(oid, &ref->old_oid);
 676         *rm = ref->next;
 677         return 0;
 678 }
 679
 680 static void update_remote_refs(const struct ref *refs,
 681                                const struct ref *mapped_refs,
 682                                const struct ref *remote_head_points_at,
 683                                const char *branch_top,
 684                                const char *msg,
 685                                struct transport *transport,
 686                                int check_connectivity)
 687 {
 688         const struct ref *rm = mapped_refs;
 689
 690         if (check_connectivity) {
 691                 struct check_connected_options opt = CHECK_CONNECTED_INIT;
 692
 693                 opt.transport = transport;
 694                 opt.progress = transport->progress;
 695
 696                 if (check_connected(iterate_ref_map, &rm, &opt))
 697                         die(_("remote did not send all necessary objects"));
 698         }
 699
 700         if (refs) {
 701                 write_remote_refs(mapped_refs);
 702                 if (option_single_branch && !option_no_tags)
 703                         write_followtags(refs, msg);
 704         }
 705
 706         if (remote_head_points_at && !option_bare) {
 707                 struct strbuf head_ref = STRBUF_INIT;
 708                 strbuf_addstr(&head_ref, branch_top);
 709                 strbuf_addstr(&head_ref, "HEAD");
 710                 if (create_symref(head_ref.buf,
 711                                   remote_head_points_at->peer_ref->name,
 712                                   msg) < 0)
 713                         die(_("unable to update %s"), head_ref.buf);
 714                 strbuf_release(&head_ref);
 715         }
 716 }
 717
 718 static void update_head(const struct ref *our, const struct ref *remote,
 719                         const char *msg)
 720 {
 721         const char *head;
 722         if (our && skip_prefix(our->name, "refs/heads/", &head)) {
 723                 /* Local default branch link */
 724                 if (create_symref("HEAD", our->name, NULL) < 0)
 725                         die(_("unable to update HEAD"));
 726                 if (!option_bare) {
 727                         update_ref(msg, "HEAD", &our->old_oid, NULL, 0,
 728                                    UPDATE_REFS_DIE_ON_ERR);
 729                         install_branch_config(0, head, remote_name, our->name);
 730                 }
 731         } else if (our) {
 732                 struct commit *c = lookup_commit_reference(the_repository,
 733                                                            &our->old_oid);
 734                 /* --branch specifies a non-branch (i.e. tags), detach HEAD */
 735                 update_ref(msg, "HEAD", &c->object.oid, NULL, REF_NO_DEREF,
 736                            UPDATE_REFS_DIE_ON_ERR);
 737         } else if (remote) {
 738                 /*
 739                  * We know remote HEAD points to a non-branch, or
 740                  * HEAD points to a branch but we don't know which one.
 741                  * Detach HEAD in all these cases.
 742                  */
 743                 update_ref(msg, "HEAD", &remote->old_oid, NULL, REF_NO_DEREF,
 744                            UPDATE_REFS_DIE_ON_ERR);
 745         }
 746 }
 747
 748 static int git_sparse_checkout_init(const char *repo)
 749 {
 750         struct strvec argv = STRVEC_INIT;
 751         int result = 0;
 752         strvec_pushl(&argv, "-C", repo, "sparse-checkout", "init", NULL);
 753
 754         /*
 755          * We must apply the setting in the current process
 756          * for the later checkout to use the sparse-checkout file.
 757          */
 758         core_apply_sparse_checkout = 1;
 759
 760         if (run_command_v_opt(argv.v, RUN_GIT_CMD)) {
 761                 error(_("failed to initialize sparse-checkout"));
 762                 result = 1;
 763         }
 764
 765         strvec_clear(&argv);
 766         return result;
 767 }
 768
 769 static int checkout(int submodule_progress)
 770 {
 771         struct object_id oid;
 772         char *head;
 773         struct lock_file lock_file = LOCK_INIT;
 774         struct unpack_trees_options opts;
 775         struct tree *tree;
 776         struct tree_desc t;
 777         int err = 0;
 778
 779         if (option_no_checkout)
 780                 return 0;
 781
 782         head = resolve_refdup("HEAD", RESOLVE_REF_READING, &oid, NULL);
 783         if (!head) {
 784                 warning(_("remote HEAD refers to nonexistent ref, "
 785                           "unable to checkout.\n"));
 786                 return 0;
 787         }
 788         if (!strcmp(head, "HEAD")) {
 789                 if (advice_enabled(ADVICE_DETACHED_HEAD))
 790                         detach_advice(oid_to_hex(&oid));
 791                 FREE_AND_NULL(head);
 792         } else {
 793                 if (!starts_with(head, "refs/heads/"))
 794                         die(_("HEAD not found below refs/heads!"));
 795         }
 796
 797         /* We need to be in the new work tree for the checkout */
 798         setup_work_tree();
 799
 800         hold_locked_index(&lock_file, LOCK_DIE_ON_ERROR);
 801
 802         memset(&opts, 0, sizeof opts);
 803         opts.update = 1;
 804         opts.merge = 1;
 805         opts.clone = 1;
 806         /* FIXME: Default should be to remove ignored files */
 807         opts.preserve_ignored = 1;
 808         opts.fn = oneway_merge;
 809         opts.verbose_update = (option_verbosity >= 0);
 810         opts.src_index = &the_index;
 811         opts.dst_index = &the_index;
 812         init_checkout_metadata(&opts.meta, head, &oid, NULL);
 813
 814         tree = parse_tree_indirect(&oid);
 815         parse_tree(tree);
 816         init_tree_desc(&t, tree->buffer, tree->size);
 817         if (unpack_trees(1, &t, &opts) < 0)
 818                 die(_("unable to checkout working tree"));
 819
 820         free(head);
 821
 822         if (write_locked_index(&the_index, &lock_file, COMMIT_LOCK))
 823                 die(_("unable to write new index file"));
 824
 825         err |= run_hook_le(NULL, "post-checkout", oid_to_hex(null_oid()),
 826                            oid_to_hex(&oid), "1", NULL);
 827
 828         if (!err && (option_recurse_submodules.nr > 0)) {
 829                 struct strvec args = STRVEC_INIT;
 830                 strvec_pushl(&args, "submodule", "update", "--require-init", "--recursive", NULL);
 831
 832                 if (option_shallow_submodules == 1)
 833                         strvec_push(&args, "--depth=1");
 834
 835                 if (max_jobs != -1)
 836                         strvec_pushf(&args, "--jobs=%d", max_jobs);
 837
 838                 if (submodule_progress)
 839                         strvec_push(&args, "--progress");
 840
 841                 if (option_verbosity < 0)
 842                         strvec_push(&args, "--quiet");
 843
 844                 if (option_remote_submodules) {
 845                         strvec_push(&args, "--remote");
 846                         strvec_push(&args, "--no-fetch");
 847                 }
 848
 849                 if (option_single_branch >= 0)
 850                         strvec_push(&args, option_single_branch ?
 851                                                "--single-branch" :
 852                                                "--no-single-branch");
 853
 854                 err = run_command_v_opt(args.v, RUN_GIT_CMD);
 855                 strvec_clear(&args);
 856         }
 857
 858         return err;
 859 }
 860
 861 static int git_clone_config(const char *k, const char *v, void *cb)
 862 {
 863         if (!strcmp(k, "clone.defaultremotename")) {
 864                 free(remote_name);
 865                 remote_name = xstrdup(v);
 866         }
 867         if (!strcmp(k, "clone.rejectshallow"))
 868                 config_reject_shallow = git_config_bool(k, v);
 869
 870         return git_default_config(k, v, cb);
 871 }
 872
 873 static int write_one_config(const char *key, const char *value, void *data)
 874 {
 875         /*
 876          * give git_clone_config a chance to write config values back to the
 877          * environment, since git_config_set_multivar_gently only deals with
 878          * config-file writes
 879          */
 880         int apply_failed = git_clone_config(key, value, data);
 881         if (apply_failed)
 882                 return apply_failed;
 883
 884         return git_config_set_multivar_gently(key,
 885                                               value ? value : "true",
 886                                               CONFIG_REGEX_NONE, 0);
 887 }
 888
 889 static void write_config(struct string_list *config)
 890 {
 891         int i;
 892
 893         for (i = 0; i < config->nr; i++) {
 894                 if (git_config_parse_parameter(config->items[i].string,
 895                                                write_one_config, NULL) < 0)
 896                         die(_("unable to write parameters to config file"));
 897         }
 898 }
 899
 900 static void write_refspec_config(const char *src_ref_prefix,
 901                 const struct ref *our_head_points_at,
 902                 const struct ref *remote_head_points_at,
 903                 struct strbuf *branch_top)
 904 {
 905         struct strbuf key = STRBUF_INIT;
 906         struct strbuf value = STRBUF_INIT;
 907
 908         if (option_mirror || !option_bare) {
 909                 if (option_single_branch && !option_mirror) {
 910                         if (option_branch) {
 911                                 if (starts_with(our_head_points_at->name, "refs/tags/"))
 912                                         strbuf_addf(&value, "+%s:%s", our_head_points_at->name,
 913                                                 our_head_points_at->name);
 914                                 else
 915                                         strbuf_addf(&value, "+%s:%s%s", our_head_points_at->name,
 916                                                 branch_top->buf, option_branch);
 917                         } else if (remote_head_points_at) {
 918                                 const char *head = remote_head_points_at->name;
 919                                 if (!skip_prefix(head, "refs/heads/", &head))
 920                                         BUG("remote HEAD points at non-head?");
 921
 922                                 strbuf_addf(&value, "+%s:%s%s", remote_head_points_at->name,
 923                                                 branch_top->buf, head);
 924                         }
 925                         /*
 926                          * otherwise, the next "git fetch" will
 927                          * simply fetch from HEAD without updating
 928                          * any remote-tracking branch, which is what
 929                          * we want.
 930                          */
 931                 } else {
 932                         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top->buf);
 933                 }
 934                 /* Configure the remote */
 935                 if (value.len) {
 936                         strbuf_addf(&key, "remote.%s.fetch", remote_name);
 937                         git_config_set_multivar(key.buf, value.buf, "^$", 0);
 938                         strbuf_reset(&key);
 939
 940                         if (option_mirror) {
 941                                 strbuf_addf(&key, "remote.%s.mirror", remote_name);
 942                                 git_config_set(key.buf, "true");
 943                                 strbuf_reset(&key);
 944                         }
 945                 }
 946         }
 947
 948         strbuf_release(&key);
 949         strbuf_release(&value);
 950 }
 951
 952 static void dissociate_from_references(void)
 953 {
 954         static const char* argv[] = { "repack", "-a", "-d", NULL };
 955         char *alternates = git_pathdup("objects/info/alternates");
 956
 957         if (!access(alternates, F_OK)) {
 958                 if (run_command_v_opt(argv, RUN_GIT_CMD|RUN_COMMAND_NO_STDIN))
 959                         die(_("cannot repack to clean up"));
 960                 if (unlink(alternates) && errno != ENOENT)
 961                         die_errno(_("cannot unlink temporary alternates file"));
 962         }
 963         free(alternates);
 964 }
 965
 966 static int path_exists(const char *path)
 967 {
 968         struct stat sb;
 969         return !stat(path, &sb);
 970 }
 971
 972 int cmd_clone(int argc, const char **argv, const char *prefix)
 973 {
 974         int is_bundle = 0, is_local;
 975         int reject_shallow = 0;
 976         const char *repo_name, *repo, *work_tree, *git_dir;
 977         char *path = NULL, *dir, *display_repo = NULL;
 978         int dest_exists, real_dest_exists = 0;
 979         const struct ref *refs, *remote_head;
 980         struct ref *remote_head_points_at = NULL;
 981         const struct ref *our_head_points_at;
 982         struct ref *mapped_refs;
 983         const struct ref *ref;
 984         struct strbuf key = STRBUF_INIT;
 985         struct strbuf branch_top = STRBUF_INIT, reflog_msg = STRBUF_INIT;
 986         struct transport *transport = NULL;
 987         const char *src_ref_prefix = "refs/heads/";
 988         struct remote *remote;
 989         int err = 0, complete_refs_before_fetch = 1;
 990         int submodule_progress;
 991
 992         struct transport_ls_refs_options transport_ls_refs_options =
 993                 TRANSPORT_LS_REFS_OPTIONS_INIT;
 994
 995         packet_trace_identity("clone");
 996
 997         git_config(git_clone_config, NULL);
 998
 999         argc = parse_options(argc, argv, prefix, builtin_clone_options,
1000                              builtin_clone_usage, 0);
1001
1002         if (argc > 2)
1003                 usage_msg_opt(_("Too many arguments."),
1004                         builtin_clone_usage, builtin_clone_options);
1005
1006         if (argc == 0)
1007                 usage_msg_opt(_("You must specify a repository to clone."),
1008                         builtin_clone_usage, builtin_clone_options);
1009
1010         if (option_depth || option_since || option_not.nr)
1011                 deepen = 1;
1012         if (option_single_branch == -1)
1013                 option_single_branch = deepen ? 1 : 0;
1014
1015         if (option_mirror)
1016                 option_bare = 1;
1017
1018         if (option_bare) {
1019                 if (option_origin)
1020                         die(_("--bare and --origin %s options are incompatible."),
1021                             option_origin);
1022                 if (real_git_dir)
1023                         die(_("--bare and --separate-git-dir are incompatible."));
1024                 option_no_checkout = 1;
1025         }
1026
1027         repo_name = argv[0];
1028
1029         path = get_repo_path(repo_name, &is_bundle);
1030         if (path) {
1031                 FREE_AND_NULL(path);
1032                 repo = absolute_pathdup(repo_name);
1033         } else if (strchr(repo_name, ':')) {
1034                 repo = repo_name;
1035                 display_repo = transport_anonymize_url(repo);
1036         } else
1037                 die(_("repository '%s' does not exist"), repo_name);
1038
1039         /* no need to be strict, transport_set_option() will validate it again */
1040         if (option_depth && atoi(option_depth) < 1)
1041                 die(_("depth %s is not a positive number"), option_depth);
1042
1043         if (argc == 2)
1044                 dir = xstrdup(argv[1]);
1045         else
1046                 dir = guess_dir_name(repo_name, is_bundle, option_bare);
1047         strip_trailing_slashes(dir);
1048
1049         dest_exists = path_exists(dir);
1050         if (dest_exists && !is_empty_dir(dir))
1051                 die(_("destination path '%s' already exists and is not "
1052                         "an empty directory."), dir);
1053
1054         if (real_git_dir) {
1055                 real_dest_exists = path_exists(real_git_dir);
1056                 if (real_dest_exists && !is_empty_dir(real_git_dir))
1057                         die(_("repository path '%s' already exists and is not "
1058                                 "an empty directory."), real_git_dir);
1059         }
1060
1061
1062         strbuf_addf(&reflog_msg, "clone: from %s",
1063                     display_repo ? display_repo : repo);
1064         free(display_repo);
1065
1066         if (option_bare)
1067                 work_tree = NULL;
1068         else {
1069                 work_tree = getenv("GIT_WORK_TREE");
1070                 if (work_tree && path_exists(work_tree))
1071                         die(_("working tree '%s' already exists."), work_tree);
1072         }
1073
1074         if (option_bare || work_tree)
1075                 git_dir = xstrdup(dir);
1076         else {
1077                 work_tree = dir;
1078                 git_dir = mkpathdup("%s/.git", dir);
1079         }
1080
1081         atexit(remove_junk);
1082         sigchain_push_common(remove_junk_on_signal);
1083
1084         if (!option_bare) {
1085                 if (safe_create_leading_directories_const(work_tree) < 0)
1086                         die_errno(_("could not create leading directories of '%s'"),
1087                                   work_tree);
1088                 if (dest_exists)
1089                         junk_work_tree_flags |= REMOVE_DIR_KEEP_TOPLEVEL;
1090                 else if (mkdir(work_tree, 0777))
1091                         die_errno(_("could not create work tree dir '%s'"),
1092                                   work_tree);
1093                 junk_work_tree = work_tree;
1094                 set_git_work_tree(work_tree);
1095         }
1096
1097         if (real_git_dir) {
1098                 if (real_dest_exists)
1099                         junk_git_dir_flags |= REMOVE_DIR_KEEP_TOPLEVEL;
1100                 junk_git_dir = real_git_dir;
1101         } else {
1102                 if (dest_exists)
1103                         junk_git_dir_flags |= REMOVE_DIR_KEEP_TOPLEVEL;
1104                 junk_git_dir = git_dir;
1105         }
1106         if (safe_create_leading_directories_const(git_dir) < 0)
1107                 die(_("could not create leading directories of '%s'"), git_dir);
1108
1109         if (0 <= option_verbosity) {
1110                 if (option_bare)
1111                         fprintf(stderr, _("Cloning into bare repository '%s'...\n"), dir);
1112                 else
1113                         fprintf(stderr, _("Cloning into '%s'...\n"), dir);
1114         }
1115
1116         if (option_recurse_submodules.nr > 0) {
1117                 struct string_list_item *item;
1118                 struct strbuf sb = STRBUF_INIT;
1119                 int val;
1120
1121                 /* remove duplicates */
1122                 string_list_sort(&option_recurse_submodules);
1123                 string_list_remove_duplicates(&option_recurse_submodules, 0);
1124
1125                 /*
1126                  * NEEDSWORK: In a multi-working-tree world, this needs to be
1127                  * set in the per-worktree config.
1128                  */
1129                 for_each_string_list_item(item, &option_recurse_submodules) {
1130                         strbuf_addf(&sb, "submodule.active=%s",
1131                                     item->string);
1132                         string_list_append(&option_config,
1133                                            strbuf_detach(&sb, NULL));
1134                 }
1135
1136                 if (!git_config_get_bool("submodule.stickyRecursiveClone", &val) &&
1137                     val)
1138                         string_list_append(&option_config, "submodule.recurse=true");
1139
1140                 if (option_required_reference.nr &&
1141                     option_optional_reference.nr)
1142                         die(_("clone --recursive is not compatible with "
1143                               "both --reference and --reference-if-able"));
1144                 else if (option_required_reference.nr) {
1145                         string_list_append(&option_config,
1146                                 "submodule.alternateLocation=superproject");
1147                         string_list_append(&option_config,
1148                                 "submodule.alternateErrorStrategy=die");
1149                 } else if (option_optional_reference.nr) {
1150                         string_list_append(&option_config,
1151                                 "submodule.alternateLocation=superproject");
1152                         string_list_append(&option_config,
1153                                 "submodule.alternateErrorStrategy=info");
1154                 }
1155         }
1156
1157         init_db(git_dir, real_git_dir, option_template, GIT_HASH_UNKNOWN, NULL,
1158                 INIT_DB_QUIET);
1159
1160         if (real_git_dir)
1161                 git_dir = real_git_dir;
1162
1163         /*
1164          * additional config can be injected with -c, make sure it's included
1165          * after init_db, which clears the entire config environment.
1166          */
1167         write_config(&option_config);
1168
1169         /*
1170          * re-read config after init_db and write_config to pick up any config
1171          * injected by --template and --config, respectively.
1172          */
1173         git_config(git_clone_config, NULL);
1174
1175         /*
1176          * If option_reject_shallow is specified from CLI option,
1177          * ignore config_reject_shallow from git_clone_config.
1178          */
1179         if (config_reject_shallow != -1)
1180                 reject_shallow = config_reject_shallow;
1181         if (option_reject_shallow != -1)
1182                 reject_shallow = option_reject_shallow;
1183
1184         /*
1185          * apply the remote name provided by --origin only after this second
1186          * call to git_config, to ensure it overrides all config-based values.
1187          */
1188         if (option_origin != NULL)
1189                 remote_name = xstrdup(option_origin);
1190
1191         if (remote_name == NULL)
1192                 remote_name = xstrdup("origin");
1193
1194         if (!valid_remote_name(remote_name))
1195                 die(_("'%s' is not a valid remote name"), remote_name);
1196
1197         if (option_bare) {
1198                 if (option_mirror)
1199                         src_ref_prefix = "refs/";
1200                 strbuf_addstr(&branch_top, src_ref_prefix);
1201
1202                 git_config_set("core.bare", "true");
1203         } else {
1204                 strbuf_addf(&branch_top, "refs/remotes/%s/", remote_name);
1205         }
1206
1207         strbuf_addf(&key, "remote.%s.url", remote_name);
1208         git_config_set(key.buf, repo);
1209         strbuf_reset(&key);
1210
1211         if (option_no_tags) {
1212                 strbuf_addf(&key, "remote.%s.tagOpt", remote_name);
1213                 git_config_set(key.buf, "--no-tags");
1214                 strbuf_reset(&key);
1215         }
1216
1217         if (option_required_reference.nr || option_optional_reference.nr)
1218                 setup_reference();
1219
1220         if (option_sparse_checkout && git_sparse_checkout_init(dir))
1221                 return 1;
1222
1223         remote = remote_get(remote_name);
1224
1225         refspec_appendf(&remote->fetch, "+%s*:%s*", src_ref_prefix,
1226                         branch_top.buf);
1227
1228         transport = transport_get(remote, remote->url[0]);
1229         transport_set_verbosity(transport, option_verbosity, option_progress);
1230         transport->family = family;
1231
1232         path = get_repo_path(remote->url[0], &is_bundle);
1233         is_local = option_local != 0 && path && !is_bundle;
1234         if (is_local) {
1235                 if (option_depth)
1236                         warning(_("--depth is ignored in local clones; use file:// instead."));
1237                 if (option_since)
1238                         warning(_("--shallow-since is ignored in local clones; use file:// instead."));
1239                 if (option_not.nr)
1240                         warning(_("--shallow-exclude is ignored in local clones; use file:// instead."));
1241                 if (filter_options.choice)
1242                         warning(_("--filter is ignored in local clones; use file:// instead."));
1243                 if (!access(mkpath("%s/shallow", path), F_OK)) {
1244                         if (reject_shallow)
1245                                 die(_("source repository is shallow, reject to clone."));
1246                         if (option_local > 0)
1247                                 warning(_("source repository is shallow, ignoring --local"));
1248                         is_local = 0;
1249                 }
1250         }
1251         if (option_local > 0 && !is_local)
1252                 warning(_("--local is ignored"));
1253         transport->cloning = 1;
1254
1255         transport_set_option(transport, TRANS_OPT_KEEP, "yes");
1256
1257         if (reject_shallow)
1258                 transport_set_option(transport, TRANS_OPT_REJECT_SHALLOW, "1");
1259         if (option_depth)
1260                 transport_set_option(transport, TRANS_OPT_DEPTH,
1261                                      option_depth);
1262         if (option_since)
1263                 transport_set_option(transport, TRANS_OPT_DEEPEN_SINCE,
1264                                      option_since);
1265         if (option_not.nr)
1266                 transport_set_option(transport, TRANS_OPT_DEEPEN_NOT,
1267                                      (const char *)&option_not);
1268         if (option_single_branch)
1269                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
1270
1271         if (option_upload_pack)
1272                 transport_set_option(transport, TRANS_OPT_UPLOADPACK,
1273                                      option_upload_pack);
1274
1275         if (server_options.nr)
1276                 transport->server_options = &server_options;
1277
1278         if (filter_options.choice) {
1279                 const char *spec =
1280                         expand_list_objects_filter_spec(&filter_options);
1281                 transport_set_option(transport, TRANS_OPT_LIST_OBJECTS_FILTER,
1282                                      spec);
1283                 transport_set_option(transport, TRANS_OPT_FROM_PROMISOR, "1");
1284         }
1285
1286         if (transport->smart_options && !deepen && !filter_options.choice)
1287                 transport->smart_options->check_self_contained_and_connected = 1;
1288
1289
1290         strvec_push(&transport_ls_refs_options.ref_prefixes, "HEAD");
1291         refspec_ref_prefixes(&remote->fetch,
1292                              &transport_ls_refs_options.ref_prefixes);
1293         if (option_branch)
1294                 expand_ref_prefix(&transport_ls_refs_options.ref_prefixes,
1295                                   option_branch);
1296         if (!option_no_tags)
1297                 strvec_push(&transport_ls_refs_options.ref_prefixes,
1298                             "refs/tags/");
1299
1300         refs = transport_get_remote_refs(transport, &transport_ls_refs_options);
1301
1302         if (refs) {
1303                 int hash_algo = hash_algo_by_ptr(transport_get_hash_algo(transport));
1304
1305                 /*
1306                  * Now that we know what algorithm the remote side is using,
1307                  * let's set ours to the same thing.
1308                  */
1309                 initialize_repository_version(hash_algo, 1);
1310                 repo_set_hash_algo(the_repository, hash_algo);
1311
1312                 mapped_refs = wanted_peer_refs(refs, &remote->fetch);
1313                 /*
1314                  * transport_get_remote_refs() may return refs with null sha-1
1315                  * in mapped_refs (see struct transport->get_refs_list
1316                  * comment). In that case we need fetch it early because
1317                  * remote_head code below relies on it.
1318                  *
1319                  * for normal clones, transport_get_remote_refs() should
1320                  * return reliable ref set, we can delay cloning until after
1321                  * remote HEAD check.
1322                  */
1323                 for (ref = refs; ref; ref = ref->next)
1324                         if (is_null_oid(&ref->old_oid)) {
1325                                 complete_refs_before_fetch = 0;
1326                                 break;
1327                         }
1328
1329                 if (!is_local && !complete_refs_before_fetch) {
1330                         if (transport_fetch_refs(transport, mapped_refs))
1331                                 die(_("remote transport reported error"));
1332                 }
1333
1334                 remote_head = find_ref_by_name(refs, "HEAD");
1335                 remote_head_points_at =
1336                         guess_remote_head(remote_head, mapped_refs, 0);
1337
1338                 if (option_branch) {
1339                         our_head_points_at =
1340                                 find_remote_branch(mapped_refs, option_branch);
1341
1342                         if (!our_head_points_at)
1343                                 die(_("Remote branch %s not found in upstream %s"),
1344                                     option_branch, remote_name);
1345                 }
1346                 else
1347                         our_head_points_at = remote_head_points_at;
1348         }
1349         else {
1350                 if (option_branch)
1351                         die(_("Remote branch %s not found in upstream %s"),
1352                                         option_branch, remote_name);
1353
1354                 warning(_("You appear to have cloned an empty repository."));
1355                 mapped_refs = NULL;
1356                 our_head_points_at = NULL;
1357                 remote_head_points_at = NULL;
1358                 remote_head = NULL;
1359                 option_no_checkout = 1;
1360                 if (!option_bare) {
1361                         const char *branch;
1362                         char *ref;
1363
1364                         if (transport_ls_refs_options.unborn_head_target &&
1365                             skip_prefix(transport_ls_refs_options.unborn_head_target,
1366                                         "refs/heads/", &branch)) {
1367                                 ref = transport_ls_refs_options.unborn_head_target;
1368                                 transport_ls_refs_options.unborn_head_target = NULL;
1369                                 create_symref("HEAD", ref, reflog_msg.buf);
1370                         } else {
1371                                 branch = git_default_branch_name(0);
1372                                 ref = xstrfmt("refs/heads/%s", branch);
1373                         }
1374
1375                         install_branch_config(0, branch, remote_name, ref);
1376                         free(ref);
1377                 }
1378         }
1379
1380         write_refspec_config(src_ref_prefix, our_head_points_at,
1381                         remote_head_points_at, &branch_top);
1382
1383         if (filter_options.choice)
1384                 partial_clone_register(remote_name, &filter_options);
1385
1386         if (is_local)
1387                 clone_local(path, git_dir);
1388         else if (refs && complete_refs_before_fetch) {
1389                 if (transport_fetch_refs(transport, mapped_refs))
1390                         die(_("remote transport reported error"));
1391         }
1392
1393         update_remote_refs(refs, mapped_refs, remote_head_points_at,
1394                            branch_top.buf, reflog_msg.buf, transport,
1395                            !is_local);
1396
1397         update_head(our_head_points_at, remote_head, reflog_msg.buf);
1398
1399         /*
1400          * We want to show progress for recursive submodule clones iff
1401          * we did so for the main clone. But only the transport knows
1402          * the final decision for this flag, so we need to rescue the value
1403          * before we free the transport.
1404          */
1405         submodule_progress = transport->progress;
1406
1407         transport_unlock_pack(transport);
1408         transport_disconnect(transport);
1409
1410         if (option_dissociate) {
1411                 close_object_store(the_repository->objects);
1412                 dissociate_from_references();
1413         }
1414
1415         junk_mode = JUNK_LEAVE_REPO;
1416         err = checkout(submodule_progress);
1417
1418         free(remote_name);
1419         strbuf_release(&reflog_msg);
1420         strbuf_release(&branch_top);
1421         strbuf_release(&key);
1422         free_refs(mapped_refs);
1423         free_refs(remote_head_points_at);
1424         free(dir);
1425         free(path);
1426         UNLEAK(repo);
1427         junk_mode = JUNK_LEAVE_ALL;
1428
1429         strvec_clear(&transport_ls_refs_options.ref_prefixes);
1430         free(transport_ls_refs_options.unborn_head_target);
1431         return err;
1432 }