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