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 #include "builtin.h"
  12 #include "lockfile.h"
  13 #include "parse-options.h"
  14 #include "fetch-pack.h"
  15 #include "refs.h"
  16 #include "tree.h"
  17 #include "tree-walk.h"
  18 #include "unpack-trees.h"
  19 #include "transport.h"
  20 #include "strbuf.h"
  21 #include "dir.h"
  22 #include "sigchain.h"
  23 #include "branch.h"
  24 #include "remote.h"
  25 #include "run-command.h"
  26 #include "connected.h"
  27
  28 /*
  29  * Overall FIXMEs:
  30  *  - respect DB_ENVIRONMENT for .git/objects.
  31  *
  32  * Implementation notes:
  33  *  - dropping use-separate-remote and no-separate-remote compatibility
  34  *
  35  */
  36 static const char * const builtin_clone_usage[] = {
  37         N_("git clone [<options>] [--] <repo> [<dir>]"),
  38         NULL
  39 };
  40
  41 static int option_no_checkout, option_bare, option_mirror, option_single_branch = -1;
  42 static int option_local = -1, option_no_hardlinks, option_shared;
  43 static int option_shallow_submodules;
  44 static int deepen;
  45 static char *option_template, *option_depth, *option_since;
  46 static char *option_origin = NULL;
  47 static char *option_branch = NULL;
  48 static struct string_list option_not = STRING_LIST_INIT_NODUP;
  49 static const char *real_git_dir;
  50 static char *option_upload_pack = "git-upload-pack";
  51 static int option_verbosity;
  52 static int option_progress = -1;
  53 static enum transport_family family;
  54 static struct string_list option_config = STRING_LIST_INIT_NODUP;
  55 static struct string_list option_required_reference = STRING_LIST_INIT_NODUP;
  56 static struct string_list option_optional_reference = STRING_LIST_INIT_NODUP;
  57 static int option_dissociate;
  58 static int max_jobs = -1;
  59 static struct string_list option_recurse_submodules = STRING_LIST_INIT_NODUP;
  60
  61 static int recurse_submodules_cb(const struct option *opt,
  62                                  const char *arg, int unset)
  63 {
  64         if (unset)
  65                 string_list_clear((struct string_list *)opt->value, 0);
  66         else if (arg)
  67                 string_list_append((struct string_list *)opt->value, arg);
  68         else
  69                 string_list_append((struct string_list *)opt->value,
  70                                    (const char *)opt->defval);
  71
  72         return 0;
  73 }
  74
  75 static struct option builtin_clone_options[] = {
  76         OPT__VERBOSITY(&option_verbosity),
  77         OPT_BOOL(0, "progress", &option_progress,
  78                  N_("force progress reporting")),
  79         OPT_BOOL('n', "no-checkout", &option_no_checkout,
  80                  N_("don't create a checkout")),
  81         OPT_BOOL(0, "bare", &option_bare, N_("create a bare repository")),
  82         OPT_HIDDEN_BOOL(0, "naked", &option_bare,
  83                         N_("create a bare repository")),
  84         OPT_BOOL(0, "mirror", &option_mirror,
  85                  N_("create a mirror repository (implies bare)")),
  86         OPT_BOOL('l', "local", &option_local,
  87                 N_("to clone from a local repository")),
  88         OPT_BOOL(0, "no-hardlinks", &option_no_hardlinks,
  89                     N_("don't use local hardlinks, always copy")),
  90         OPT_BOOL('s', "shared", &option_shared,
  91                     N_("setup as shared repository")),
  92         { OPTION_CALLBACK, 0, "recursive", &option_recurse_submodules,
  93           N_("pathspec"), N_("initialize submodules in the clone"),
  94           PARSE_OPT_OPTARG | PARSE_OPT_HIDDEN, recurse_submodules_cb,
  95           (intptr_t)"." },
  96         { OPTION_CALLBACK, 0, "recurse-submodules", &option_recurse_submodules,
  97           N_("pathspec"), N_("initialize submodules in the clone"),
  98           PARSE_OPT_OPTARG, recurse_submodules_cb, (intptr_t)"." },
  99         OPT_INTEGER('j', "jobs", &max_jobs,
 100                     N_("number of submodules cloned in parallel")),
 101         OPT_STRING(0, "template", &option_template, N_("template-directory"),
 102                    N_("directory from which templates will be used")),
 103         OPT_STRING_LIST(0, "reference", &option_required_reference, N_("repo"),
 104                         N_("reference repository")),
 105         OPT_STRING_LIST(0, "reference-if-able", &option_optional_reference,
 106                         N_("repo"), N_("reference repository")),
 107         OPT_BOOL(0, "dissociate", &option_dissociate,
 108                  N_("use --reference only while cloning")),
 109         OPT_STRING('o', "origin", &option_origin, N_("name"),
 110                    N_("use <name> instead of 'origin' to track upstream")),
 111         OPT_STRING('b', "branch", &option_branch, N_("branch"),
 112                    N_("checkout <branch> instead of the remote's HEAD")),
 113         OPT_STRING('u', "upload-pack", &option_upload_pack, N_("path"),
 114                    N_("path to git-upload-pack on the remote")),
 115         OPT_STRING(0, "depth", &option_depth, N_("depth"),
 116                     N_("create a shallow clone of that depth")),
 117         OPT_STRING(0, "shallow-since", &option_since, N_("time"),
 118                     N_("create a shallow clone since a specific time")),
 119         OPT_STRING_LIST(0, "shallow-exclude", &option_not, N_("revision"),
 120                         N_("deepen history of shallow clone, excluding rev")),
 121         OPT_BOOL(0, "single-branch", &option_single_branch,
 122                     N_("clone only one branch, HEAD or --branch")),
 123         OPT_BOOL(0, "shallow-submodules", &option_shallow_submodules,
 124                     N_("any cloned submodules will be shallow")),
 125         OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
 126                    N_("separate git dir from working tree")),
 127         OPT_STRING_LIST('c', "config", &option_config, N_("key=value"),
 128                         N_("set config inside the new repository")),
 129         OPT_SET_INT('4', "ipv4", &family, N_("use IPv4 addresses only"),
 130                         TRANSPORT_FAMILY_IPV4),
 131         OPT_SET_INT('6', "ipv6", &family, N_("use IPv6 addresses only"),
 132                         TRANSPORT_FAMILY_IPV6),
 133         OPT_END()
 134 };
 135
 136 static const char *get_repo_path_1(struct strbuf *path, int *is_bundle)
 137 {
 138         static char *suffix[] = { "/.git", "", ".git/.git", ".git" };
 139         static char *bundle_suffix[] = { ".bundle", "" };
 140         size_t baselen = path->len;
 141         struct stat st;
 142         int i;
 143
 144         for (i = 0; i < ARRAY_SIZE(suffix); i++) {
 145                 strbuf_setlen(path, baselen);
 146                 strbuf_addstr(path, suffix[i]);
 147                 if (stat(path->buf, &st))
 148                         continue;
 149                 if (S_ISDIR(st.st_mode) && is_git_directory(path->buf)) {
 150                         *is_bundle = 0;
 151                         return path->buf;
 152                 } else if (S_ISREG(st.st_mode) && st.st_size > 8) {
 153                         /* Is it a "gitfile"? */
 154                         char signature[8];
 155                         const char *dst;
 156                         int len, fd = open(path->buf, O_RDONLY);
 157                         if (fd < 0)
 158                                 continue;
 159                         len = read_in_full(fd, signature, 8);
 160                         close(fd);
 161                         if (len != 8 || strncmp(signature, "gitdir: ", 8))
 162                                 continue;
 163                         dst = read_gitfile(path->buf);
 164                         if (dst) {
 165                                 *is_bundle = 0;
 166                                 return dst;
 167                         }
 168                 }
 169         }
 170
 171         for (i = 0; i < ARRAY_SIZE(bundle_suffix); i++) {
 172                 strbuf_setlen(path, baselen);
 173                 strbuf_addstr(path, bundle_suffix[i]);
 174                 if (!stat(path->buf, &st) && S_ISREG(st.st_mode)) {
 175                         *is_bundle = 1;
 176                         return path->buf;
 177                 }
 178         }
 179
 180         return NULL;
 181 }
 182
 183 static char *get_repo_path(const char *repo, int *is_bundle)
 184 {
 185         struct strbuf path = STRBUF_INIT;
 186         const char *raw;
 187         char *canon;
 188
 189         strbuf_addstr(&path, repo);
 190         raw = get_repo_path_1(&path, is_bundle);
 191         canon = raw ? absolute_pathdup(raw) : NULL;
 192         strbuf_release(&path);
 193         return canon;
 194 }
 195
 196 static char *guess_dir_name(const char *repo, int is_bundle, int is_bare)
 197 {
 198         const char *end = repo + strlen(repo), *start, *ptr;
 199         size_t len;
 200         char *dir;
 201
 202         /*
 203          * Skip scheme.
 204          */
 205         start = strstr(repo, "://");
 206         if (start == NULL)
 207                 start = repo;
 208         else
 209                 start += 3;
 210
 211         /*
 212          * Skip authentication data. The stripping does happen
 213          * greedily, such that we strip up to the last '@' inside
 214          * the host part.
 215          */
 216         for (ptr = start; ptr < end && !is_dir_sep(*ptr); ptr++) {
 217                 if (*ptr == '@')
 218                         start = ptr + 1;
 219         }
 220
 221         /*
 222          * Strip trailing spaces, slashes and /.git
 223          */
 224         while (start < end && (is_dir_sep(end[-1]) || isspace(end[-1])))
 225                 end--;
 226         if (end - start > 5 && is_dir_sep(end[-5]) &&
 227             !strncmp(end - 4, ".git", 4)) {
 228                 end -= 5;
 229                 while (start < end && is_dir_sep(end[-1]))
 230                         end--;
 231         }
 232
 233         /*
 234          * Strip trailing port number if we've got only a
 235          * hostname (that is, there is no dir separator but a
 236          * colon). This check is required such that we do not
 237          * strip URI's like '/foo/bar:2222.git', which should
 238          * result in a dir '2222' being guessed due to backwards
 239          * compatibility.
 240          */
 241         if (memchr(start, '/', end - start) == NULL
 242             && memchr(start, ':', end - start) != NULL) {
 243                 ptr = end;
 244                 while (start < ptr && isdigit(ptr[-1]) && ptr[-1] != ':')
 245                         ptr--;
 246                 if (start < ptr && ptr[-1] == ':')
 247                         end = ptr - 1;
 248         }
 249
 250         /*
 251          * Find last component. To remain backwards compatible we
 252          * also regard colons as path separators, such that
 253          * cloning a repository 'foo:bar.git' would result in a
 254          * directory 'bar' being guessed.
 255          */
 256         ptr = end;
 257         while (start < ptr && !is_dir_sep(ptr[-1]) && ptr[-1] != ':')
 258                 ptr--;
 259         start = ptr;
 260
 261         /*
 262          * Strip .{bundle,git}.
 263          */
 264         len = end - start;
 265         strip_suffix_mem(start, &len, is_bundle ? ".bundle" : ".git");
 266
 267         if (!len || (len == 1 && *start == '/'))
 268                 die(_("No directory name could be guessed.\n"
 269                       "Please specify a directory on the command line"));
 270
 271         if (is_bare)
 272                 dir = xstrfmt("%.*s.git", (int)len, start);
 273         else
 274                 dir = xstrndup(start, len);
 275         /*
 276          * Replace sequences of 'control' characters and whitespace
 277          * with one ascii space, remove leading and trailing spaces.
 278          */
 279         if (*dir) {
 280                 char *out = dir;
 281                 int prev_space = 1 /* strip leading whitespace */;
 282                 for (end = dir; *end; ++end) {
 283                         char ch = *end;
 284                         if ((unsigned char)ch < '\x20')
 285                                 ch = '\x20';
 286                         if (isspace(ch)) {
 287                                 if (prev_space)
 288                                         continue;
 289                                 prev_space = 1;
 290                         } else
 291                                 prev_space = 0;
 292                         *out++ = ch;
 293                 }
 294                 *out = '\0';
 295                 if (out > dir && prev_space)
 296                         out[-1] = '\0';
 297         }
 298         return dir;
 299 }
 300
 301 static void strip_trailing_slashes(char *dir)
 302 {
 303         char *end = dir + strlen(dir);
 304
 305         while (dir < end - 1 && is_dir_sep(end[-1]))
 306                 end--;
 307         *end = '\0';
 308 }
 309
 310 static int add_one_reference(struct string_list_item *item, void *cb_data)
 311 {
 312         struct strbuf err = STRBUF_INIT;
 313         int *required = cb_data;
 314         char *ref_git = compute_alternate_path(item->string, &err);
 315
 316         if (!ref_git) {
 317                 if (*required)
 318                         die("%s", err.buf);
 319                 else
 320                         fprintf(stderr,
 321                                 _("info: Could not add alternate for '%s': %s\n"),
 322                                 item->string, err.buf);
 323         } else {
 324                 struct strbuf sb = STRBUF_INIT;
 325                 strbuf_addf(&sb, "%s/objects", ref_git);
 326                 add_to_alternates_file(sb.buf);
 327                 strbuf_release(&sb);
 328         }
 329
 330         strbuf_release(&err);
 331         free(ref_git);
 332         return 0;
 333 }
 334
 335 static void setup_reference(void)
 336 {
 337         int required = 1;
 338         for_each_string_list(&option_required_reference,
 339                              add_one_reference, &required);
 340         required = 0;
 341         for_each_string_list(&option_optional_reference,
 342                              add_one_reference, &required);
 343 }
 344
 345 static void copy_alternates(struct strbuf *src, struct strbuf *dst,
 346                             const char *src_repo)
 347 {
 348         /*
 349          * Read from the source objects/info/alternates file
 350          * and copy the entries to corresponding file in the
 351          * destination repository with add_to_alternates_file().
 352          * Both src and dst have "$path/objects/info/alternates".
 353          *
 354          * Instead of copying bit-for-bit from the original,
 355          * we need to append to existing one so that the already
 356          * created entry via "clone -s" is not lost, and also
 357          * to turn entries with paths relative to the original
 358          * absolute, so that they can be used in the new repository.
 359          */
 360         FILE *in = fopen(src->buf, "r");
 361         struct strbuf line = STRBUF_INIT;
 362
 363         while (strbuf_getline(&line, in) != EOF) {
 364                 char *abs_path;
 365                 if (!line.len || line.buf[0] == '#')
 366                         continue;
 367                 if (is_absolute_path(line.buf)) {
 368                         add_to_alternates_file(line.buf);
 369                         continue;
 370                 }
 371                 abs_path = mkpathdup("%s/objects/%s", src_repo, line.buf);
 372                 if (!normalize_path_copy(abs_path, abs_path))
 373                         add_to_alternates_file(abs_path);
 374                 else
 375                         warning("skipping invalid relative alternate: %s/%s",
 376                                 src_repo, line.buf);
 377                 free(abs_path);
 378         }
 379         strbuf_release(&line);
 380         fclose(in);
 381 }
 382
 383 static void copy_or_link_directory(struct strbuf *src, struct strbuf *dest,
 384                                    const char *src_repo, int src_baselen)
 385 {
 386         struct dirent *de;
 387         struct stat buf;
 388         int src_len, dest_len;
 389         DIR *dir;
 390
 391         dir = opendir(src->buf);
 392         if (!dir)
 393                 die_errno(_("failed to open '%s'"), src->buf);
 394
 395         if (mkdir(dest->buf, 0777)) {
 396                 if (errno != EEXIST)
 397                         die_errno(_("failed to create directory '%s'"), dest->buf);
 398                 else if (stat(dest->buf, &buf))
 399                         die_errno(_("failed to stat '%s'"), dest->buf);
 400                 else if (!S_ISDIR(buf.st_mode))
 401                         die(_("%s exists and is not a directory"), dest->buf);
 402         }
 403
 404         strbuf_addch(src, '/');
 405         src_len = src->len;
 406         strbuf_addch(dest, '/');
 407         dest_len = dest->len;
 408
 409         while ((de = readdir(dir)) != NULL) {
 410                 strbuf_setlen(src, src_len);
 411                 strbuf_addstr(src, de->d_name);
 412                 strbuf_setlen(dest, dest_len);
 413                 strbuf_addstr(dest, de->d_name);
 414                 if (stat(src->buf, &buf)) {
 415                         warning (_("failed to stat %s\n"), src->buf);
 416                         continue;
 417                 }
 418                 if (S_ISDIR(buf.st_mode)) {
 419                         if (de->d_name[0] != '.')
 420                                 copy_or_link_directory(src, dest,
 421                                                        src_repo, src_baselen);
 422                         continue;
 423                 }
 424
 425                 /* Files that cannot be copied bit-for-bit... */
 426                 if (!strcmp(src->buf + src_baselen, "/info/alternates")) {
 427                         copy_alternates(src, dest, src_repo);
 428                         continue;
 429                 }
 430
 431                 if (unlink(dest->buf) && errno != ENOENT)
 432                         die_errno(_("failed to unlink '%s'"), dest->buf);
 433                 if (!option_no_hardlinks) {
 434                         if (!link(src->buf, dest->buf))
 435                                 continue;
 436                         if (option_local > 0)
 437                                 die_errno(_("failed to create link '%s'"), dest->buf);
 438                         option_no_hardlinks = 1;
 439                 }
 440                 if (copy_file_with_time(dest->buf, src->buf, 0666))
 441                         die_errno(_("failed to copy file to '%s'"), dest->buf);
 442         }
 443         closedir(dir);
 444 }
 445
 446 static void clone_local(const char *src_repo, const char *dest_repo)
 447 {
 448         if (option_shared) {
 449                 struct strbuf alt = STRBUF_INIT;
 450                 strbuf_addf(&alt, "%s/objects", src_repo);
 451                 add_to_alternates_file(alt.buf);
 452                 strbuf_release(&alt);
 453         } else {
 454                 struct strbuf src = STRBUF_INIT;
 455                 struct strbuf dest = STRBUF_INIT;
 456                 get_common_dir(&src, src_repo);
 457                 get_common_dir(&dest, dest_repo);
 458                 strbuf_addstr(&src, "/objects");
 459                 strbuf_addstr(&dest, "/objects");
 460                 copy_or_link_directory(&src, &dest, src_repo, src.len);
 461                 strbuf_release(&src);
 462                 strbuf_release(&dest);
 463         }
 464
 465         if (0 <= option_verbosity)
 466                 fprintf(stderr, _("done.\n"));
 467 }
 468
 469 static const char *junk_work_tree;
 470 static const char *junk_git_dir;
 471 static enum {
 472         JUNK_LEAVE_NONE,
 473         JUNK_LEAVE_REPO,
 474         JUNK_LEAVE_ALL
 475 } junk_mode = JUNK_LEAVE_NONE;
 476
 477 static const char junk_leave_repo_msg[] =
 478 N_("Clone succeeded, but checkout failed.\n"
 479    "You can inspect what was checked out with 'git status'\n"
 480    "and retry the checkout with 'git checkout -f HEAD'\n");
 481
 482 static void remove_junk(void)
 483 {
 484         struct strbuf sb = STRBUF_INIT;
 485
 486         switch (junk_mode) {
 487         case JUNK_LEAVE_REPO:
 488                 warning("%s", _(junk_leave_repo_msg));
 489                 /* fall-through */
 490         case JUNK_LEAVE_ALL:
 491                 return;
 492         default:
 493                 /* proceed to removal */
 494                 break;
 495         }
 496
 497         if (junk_git_dir) {
 498                 strbuf_addstr(&sb, junk_git_dir);
 499                 remove_dir_recursively(&sb, 0);
 500                 strbuf_reset(&sb);
 501         }
 502         if (junk_work_tree) {
 503                 strbuf_addstr(&sb, junk_work_tree);
 504                 remove_dir_recursively(&sb, 0);
 505                 strbuf_reset(&sb);
 506         }
 507 }
 508
 509 static void remove_junk_on_signal(int signo)
 510 {
 511         remove_junk();
 512         sigchain_pop(signo);
 513         raise(signo);
 514 }
 515
 516 static struct ref *find_remote_branch(const struct ref *refs, const char *branch)
 517 {
 518         struct ref *ref;
 519         struct strbuf head = STRBUF_INIT;
 520         strbuf_addstr(&head, "refs/heads/");
 521         strbuf_addstr(&head, branch);
 522         ref = find_ref_by_name(refs, head.buf);
 523         strbuf_release(&head);
 524
 525         if (ref)
 526                 return ref;
 527
 528         strbuf_addstr(&head, "refs/tags/");
 529         strbuf_addstr(&head, branch);
 530         ref = find_ref_by_name(refs, head.buf);
 531         strbuf_release(&head);
 532
 533         return ref;
 534 }
 535
 536 static struct ref *wanted_peer_refs(const struct ref *refs,
 537                 struct refspec *refspec)
 538 {
 539         struct ref *head = copy_ref(find_ref_by_name(refs, "HEAD"));
 540         struct ref *local_refs = head;
 541         struct ref **tail = head ? &head->next : &local_refs;
 542
 543         if (option_single_branch) {
 544                 struct ref *remote_head = NULL;
 545
 546                 if (!option_branch)
 547                         remote_head = guess_remote_head(head, refs, 0);
 548                 else {
 549                         local_refs = NULL;
 550                         tail = &local_refs;
 551                         remote_head = copy_ref(find_remote_branch(refs, option_branch));
 552                 }
 553
 554                 if (!remote_head && option_branch)
 555                         warning(_("Could not find remote branch %s to clone."),
 556                                 option_branch);
 557                 else {
 558                         get_fetch_map(remote_head, refspec, &tail, 0);
 559
 560                         /* if --branch=tag, pull the requested tag explicitly */
 561                         get_fetch_map(remote_head, tag_refspec, &tail, 0);
 562                 }
 563         } else
 564                 get_fetch_map(refs, refspec, &tail, 0);
 565
 566         if (!option_mirror && !option_single_branch)
 567                 get_fetch_map(refs, tag_refspec, &tail, 0);
 568
 569         return local_refs;
 570 }
 571
 572 static void write_remote_refs(const struct ref *local_refs)
 573 {
 574         const struct ref *r;
 575
 576         struct ref_transaction *t;
 577         struct strbuf err = STRBUF_INIT;
 578
 579         t = ref_transaction_begin(&err);
 580         if (!t)
 581                 die("%s", err.buf);
 582
 583         for (r = local_refs; r; r = r->next) {
 584                 if (!r->peer_ref)
 585                         continue;
 586                 if (ref_transaction_create(t, r->peer_ref->name, r->old_oid.hash,
 587                                            0, NULL, &err))
 588                         die("%s", err.buf);
 589         }
 590
 591         if (initial_ref_transaction_commit(t, &err))
 592                 die("%s", err.buf);
 593
 594         strbuf_release(&err);
 595         ref_transaction_free(t);
 596 }
 597
 598 static void write_followtags(const struct ref *refs, const char *msg)
 599 {
 600         const struct ref *ref;
 601         for (ref = refs; ref; ref = ref->next) {
 602                 if (!starts_with(ref->name, "refs/tags/"))
 603                         continue;
 604                 if (ends_with(ref->name, "^{}"))
 605                         continue;
 606                 if (!has_object_file(&ref->old_oid))
 607                         continue;
 608                 update_ref(msg, ref->name, ref->old_oid.hash,
 609                            NULL, 0, UPDATE_REFS_DIE_ON_ERR);
 610         }
 611 }
 612
 613 static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
 614 {
 615         struct ref **rm = cb_data;
 616         struct ref *ref = *rm;
 617
 618         /*
 619          * Skip anything missing a peer_ref, which we are not
 620          * actually going to write a ref for.
 621          */
 622         while (ref && !ref->peer_ref)
 623                 ref = ref->next;
 624         /* Returning -1 notes "end of list" to the caller. */
 625         if (!ref)
 626                 return -1;
 627
 628         hashcpy(sha1, ref->old_oid.hash);
 629         *rm = ref->next;
 630         return 0;
 631 }
 632
 633 static void update_remote_refs(const struct ref *refs,
 634                                const struct ref *mapped_refs,
 635                                const struct ref *remote_head_points_at,
 636                                const char *branch_top,
 637                                const char *msg,
 638                                struct transport *transport,
 639                                int check_connectivity)
 640 {
 641         const struct ref *rm = mapped_refs;
 642
 643         if (check_connectivity) {
 644                 struct check_connected_options opt = CHECK_CONNECTED_INIT;
 645
 646                 opt.transport = transport;
 647                 opt.progress = transport->progress;
 648
 649                 if (check_connected(iterate_ref_map, &rm, &opt))
 650                         die(_("remote did not send all necessary objects"));
 651         }
 652
 653         if (refs) {
 654                 write_remote_refs(mapped_refs);
 655                 if (option_single_branch)
 656                         write_followtags(refs, msg);
 657         }
 658
 659         if (remote_head_points_at && !option_bare) {
 660                 struct strbuf head_ref = STRBUF_INIT;
 661                 strbuf_addstr(&head_ref, branch_top);
 662                 strbuf_addstr(&head_ref, "HEAD");
 663                 if (create_symref(head_ref.buf,
 664                                   remote_head_points_at->peer_ref->name,
 665                                   msg) < 0)
 666                         die(_("unable to update %s"), head_ref.buf);
 667                 strbuf_release(&head_ref);
 668         }
 669 }
 670
 671 static void update_head(const struct ref *our, const struct ref *remote,
 672                         const char *msg)
 673 {
 674         const char *head;
 675         if (our && skip_prefix(our->name, "refs/heads/", &head)) {
 676                 /* Local default branch link */
 677                 if (create_symref("HEAD", our->name, NULL) < 0)
 678                         die(_("unable to update HEAD"));
 679                 if (!option_bare) {
 680                         update_ref(msg, "HEAD", our->old_oid.hash, NULL, 0,
 681                                    UPDATE_REFS_DIE_ON_ERR);
 682                         install_branch_config(0, head, option_origin, our->name);
 683                 }
 684         } else if (our) {
 685                 struct commit *c = lookup_commit_reference(our->old_oid.hash);
 686                 /* --branch specifies a non-branch (i.e. tags), detach HEAD */
 687                 update_ref(msg, "HEAD", c->object.oid.hash,
 688                            NULL, REF_NODEREF, UPDATE_REFS_DIE_ON_ERR);
 689         } else if (remote) {
 690                 /*
 691                  * We know remote HEAD points to a non-branch, or
 692                  * HEAD points to a branch but we don't know which one.
 693                  * Detach HEAD in all these cases.
 694                  */
 695                 update_ref(msg, "HEAD", remote->old_oid.hash,
 696                            NULL, REF_NODEREF, UPDATE_REFS_DIE_ON_ERR);
 697         }
 698 }
 699
 700 static int checkout(int submodule_progress)
 701 {
 702         struct object_id oid;
 703         char *head;
 704         struct lock_file *lock_file;
 705         struct unpack_trees_options opts;
 706         struct tree *tree;
 707         struct tree_desc t;
 708         int err = 0;
 709
 710         if (option_no_checkout)
 711                 return 0;
 712
 713         head = resolve_refdup("HEAD", RESOLVE_REF_READING, oid.hash, NULL);
 714         if (!head) {
 715                 warning(_("remote HEAD refers to nonexistent ref, "
 716                           "unable to checkout.\n"));
 717                 return 0;
 718         }
 719         if (!strcmp(head, "HEAD")) {
 720                 if (advice_detached_head)
 721                         detach_advice(oid_to_hex(&oid));
 722         } else {
 723                 if (!starts_with(head, "refs/heads/"))
 724                         die(_("HEAD not found below refs/heads!"));
 725         }
 726         free(head);
 727
 728         /* We need to be in the new work tree for the checkout */
 729         setup_work_tree();
 730
 731         lock_file = xcalloc(1, sizeof(struct lock_file));
 732         hold_locked_index(lock_file, LOCK_DIE_ON_ERROR);
 733
 734         memset(&opts, 0, sizeof opts);
 735         opts.update = 1;
 736         opts.merge = 1;
 737         opts.fn = oneway_merge;
 738         opts.verbose_update = (option_verbosity >= 0);
 739         opts.src_index = &the_index;
 740         opts.dst_index = &the_index;
 741
 742         tree = parse_tree_indirect(oid.hash);
 743         parse_tree(tree);
 744         init_tree_desc(&t, tree->buffer, tree->size);
 745         if (unpack_trees(1, &t, &opts) < 0)
 746                 die(_("unable to checkout working tree"));
 747
 748         if (write_locked_index(&the_index, lock_file, COMMIT_LOCK))
 749                 die(_("unable to write new index file"));
 750
 751         err |= run_hook_le(NULL, "post-checkout", sha1_to_hex(null_sha1),
 752                            oid_to_hex(&oid), "1", NULL);
 753
 754         if (!err && (option_recurse_submodules.nr > 0)) {
 755                 struct argv_array args = ARGV_ARRAY_INIT;
 756                 argv_array_pushl(&args, "submodule", "update", "--init", "--recursive", NULL);
 757
 758                 if (option_shallow_submodules == 1)
 759                         argv_array_push(&args, "--depth=1");
 760
 761                 if (max_jobs != -1)
 762                         argv_array_pushf(&args, "--jobs=%d", max_jobs);
 763
 764                 if (submodule_progress)
 765                         argv_array_push(&args, "--progress");
 766
 767                 err = run_command_v_opt(args.argv, RUN_GIT_CMD);
 768                 argv_array_clear(&args);
 769         }
 770
 771         return err;
 772 }
 773
 774 static int write_one_config(const char *key, const char *value, void *data)
 775 {
 776         return git_config_set_multivar_gently(key, value ? value : "true", "^$", 0);
 777 }
 778
 779 static void write_config(struct string_list *config)
 780 {
 781         int i;
 782
 783         for (i = 0; i < config->nr; i++) {
 784                 if (git_config_parse_parameter(config->items[i].string,
 785                                                write_one_config, NULL) < 0)
 786                         die(_("unable to write parameters to config file"));
 787         }
 788 }
 789
 790 static void write_refspec_config(const char *src_ref_prefix,
 791                 const struct ref *our_head_points_at,
 792                 const struct ref *remote_head_points_at,
 793                 struct strbuf *branch_top)
 794 {
 795         struct strbuf key = STRBUF_INIT;
 796         struct strbuf value = STRBUF_INIT;
 797
 798         if (option_mirror || !option_bare) {
 799                 if (option_single_branch && !option_mirror) {
 800                         if (option_branch) {
 801                                 if (starts_with(our_head_points_at->name, "refs/tags/"))
 802                                         strbuf_addf(&value, "+%s:%s", our_head_points_at->name,
 803                                                 our_head_points_at->name);
 804                                 else
 805                                         strbuf_addf(&value, "+%s:%s%s", our_head_points_at->name,
 806                                                 branch_top->buf, option_branch);
 807                         } else if (remote_head_points_at) {
 808                                 const char *head = remote_head_points_at->name;
 809                                 if (!skip_prefix(head, "refs/heads/", &head))
 810                                         die("BUG: remote HEAD points at non-head?");
 811
 812                                 strbuf_addf(&value, "+%s:%s%s", remote_head_points_at->name,
 813                                                 branch_top->buf, head);
 814                         }
 815                         /*
 816                          * otherwise, the next "git fetch" will
 817                          * simply fetch from HEAD without updating
 818                          * any remote-tracking branch, which is what
 819                          * we want.
 820                          */
 821                 } else {
 822                         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top->buf);
 823                 }
 824                 /* Configure the remote */
 825                 if (value.len) {
 826                         strbuf_addf(&key, "remote.%s.fetch", option_origin);
 827                         git_config_set_multivar(key.buf, value.buf, "^$", 0);
 828                         strbuf_reset(&key);
 829
 830                         if (option_mirror) {
 831                                 strbuf_addf(&key, "remote.%s.mirror", option_origin);
 832                                 git_config_set(key.buf, "true");
 833                                 strbuf_reset(&key);
 834                         }
 835                 }
 836         }
 837
 838         strbuf_release(&key);
 839         strbuf_release(&value);
 840 }
 841
 842 static void dissociate_from_references(void)
 843 {
 844         static const char* argv[] = { "repack", "-a", "-d", NULL };
 845         char *alternates = git_pathdup("objects/info/alternates");
 846
 847         if (!access(alternates, F_OK)) {
 848                 if (run_command_v_opt(argv, RUN_GIT_CMD|RUN_COMMAND_NO_STDIN))
 849                         die(_("cannot repack to clean up"));
 850                 if (unlink(alternates) && errno != ENOENT)
 851                         die_errno(_("cannot unlink temporary alternates file"));
 852         }
 853         free(alternates);
 854 }
 855
 856 int cmd_clone(int argc, const char **argv, const char *prefix)
 857 {
 858         int is_bundle = 0, is_local;
 859         struct stat buf;
 860         const char *repo_name, *repo, *work_tree, *git_dir;
 861         char *path, *dir;
 862         int dest_exists;
 863         const struct ref *refs, *remote_head;
 864         const struct ref *remote_head_points_at;
 865         const struct ref *our_head_points_at;
 866         struct ref *mapped_refs;
 867         const struct ref *ref;
 868         struct strbuf key = STRBUF_INIT, value = STRBUF_INIT;
 869         struct strbuf branch_top = STRBUF_INIT, reflog_msg = STRBUF_INIT;
 870         struct transport *transport = NULL;
 871         const char *src_ref_prefix = "refs/heads/";
 872         struct remote *remote;
 873         int err = 0, complete_refs_before_fetch = 1;
 874         int submodule_progress;
 875
 876         struct refspec *refspec;
 877         const char *fetch_pattern;
 878
 879         packet_trace_identity("clone");
 880         argc = parse_options(argc, argv, prefix, builtin_clone_options,
 881                              builtin_clone_usage, 0);
 882
 883         if (argc > 2)
 884                 usage_msg_opt(_("Too many arguments."),
 885                         builtin_clone_usage, builtin_clone_options);
 886
 887         if (argc == 0)
 888                 usage_msg_opt(_("You must specify a repository to clone."),
 889                         builtin_clone_usage, builtin_clone_options);
 890
 891         if (option_depth || option_since || option_not.nr)
 892                 deepen = 1;
 893         if (option_single_branch == -1)
 894                 option_single_branch = deepen ? 1 : 0;
 895
 896         if (option_mirror)
 897                 option_bare = 1;
 898
 899         if (option_bare) {
 900                 if (option_origin)
 901                         die(_("--bare and --origin %s options are incompatible."),
 902                             option_origin);
 903                 if (real_git_dir)
 904                         die(_("--bare and --separate-git-dir are incompatible."));
 905                 option_no_checkout = 1;
 906         }
 907
 908         if (!option_origin)
 909                 option_origin = "origin";
 910
 911         repo_name = argv[0];
 912
 913         path = get_repo_path(repo_name, &is_bundle);
 914         if (path)
 915                 repo = absolute_pathdup(repo_name);
 916         else if (!strchr(repo_name, ':'))
 917                 die(_("repository '%s' does not exist"), repo_name);
 918         else
 919                 repo = repo_name;
 920
 921         /* no need to be strict, transport_set_option() will validate it again */
 922         if (option_depth && atoi(option_depth) < 1)
 923                 die(_("depth %s is not a positive number"), option_depth);
 924
 925         if (argc == 2)
 926                 dir = xstrdup(argv[1]);
 927         else
 928                 dir = guess_dir_name(repo_name, is_bundle, option_bare);
 929         strip_trailing_slashes(dir);
 930
 931         dest_exists = !stat(dir, &buf);
 932         if (dest_exists && !is_empty_dir(dir))
 933                 die(_("destination path '%s' already exists and is not "
 934                         "an empty directory."), dir);
 935
 936         strbuf_addf(&reflog_msg, "clone: from %s", repo);
 937
 938         if (option_bare)
 939                 work_tree = NULL;
 940         else {
 941                 work_tree = getenv("GIT_WORK_TREE");
 942                 if (work_tree && !stat(work_tree, &buf))
 943                         die(_("working tree '%s' already exists."), work_tree);
 944         }
 945
 946         if (option_bare || work_tree)
 947                 git_dir = xstrdup(dir);
 948         else {
 949                 work_tree = dir;
 950                 git_dir = mkpathdup("%s/.git", dir);
 951         }
 952
 953         atexit(remove_junk);
 954         sigchain_push_common(remove_junk_on_signal);
 955
 956         if (!option_bare) {
 957                 if (safe_create_leading_directories_const(work_tree) < 0)
 958                         die_errno(_("could not create leading directories of '%s'"),
 959                                   work_tree);
 960                 if (!dest_exists && mkdir(work_tree, 0777))
 961                         die_errno(_("could not create work tree dir '%s'"),
 962                                   work_tree);
 963                 junk_work_tree = work_tree;
 964                 set_git_work_tree(work_tree);
 965         }
 966
 967         junk_git_dir = real_git_dir ? real_git_dir : git_dir;
 968         if (safe_create_leading_directories_const(git_dir) < 0)
 969                 die(_("could not create leading directories of '%s'"), git_dir);
 970
 971         if (0 <= option_verbosity) {
 972                 if (option_bare)
 973                         fprintf(stderr, _("Cloning into bare repository '%s'...\n"), dir);
 974                 else
 975                         fprintf(stderr, _("Cloning into '%s'...\n"), dir);
 976         }
 977
 978         if (option_recurse_submodules.nr > 0) {
 979                 struct string_list_item *item;
 980                 struct strbuf sb = STRBUF_INIT;
 981
 982                 /* remove duplicates */
 983                 string_list_sort(&option_recurse_submodules);
 984                 string_list_remove_duplicates(&option_recurse_submodules, 0);
 985
 986                 /*
 987                  * NEEDSWORK: In a multi-working-tree world, this needs to be
 988                  * set in the per-worktree config.
 989                  */
 990                 for_each_string_list_item(item, &option_recurse_submodules) {
 991                         strbuf_addf(&sb, "submodule.active=%s",
 992                                     item->string);
 993                         string_list_append(&option_config,
 994                                            strbuf_detach(&sb, NULL));
 995                 }
 996
 997                 if (option_required_reference.nr &&
 998                     option_optional_reference.nr)
 999                         die(_("clone --recursive is not compatible with "
1000                               "both --reference and --reference-if-able"));
1001                 else if (option_required_reference.nr) {
1002                         string_list_append(&option_config,
1003                                 "submodule.alternateLocation=superproject");
1004                         string_list_append(&option_config,
1005                                 "submodule.alternateErrorStrategy=die");
1006                 } else if (option_optional_reference.nr) {
1007                         string_list_append(&option_config,
1008                                 "submodule.alternateLocation=superproject");
1009                         string_list_append(&option_config,
1010                                 "submodule.alternateErrorStrategy=info");
1011                 }
1012         }
1013
1014         init_db(git_dir, real_git_dir, option_template, INIT_DB_QUIET);
1015
1016         if (real_git_dir)
1017                 git_dir = real_git_dir;
1018
1019         write_config(&option_config);
1020
1021         git_config(git_default_config, NULL);
1022
1023         if (option_bare) {
1024                 if (option_mirror)
1025                         src_ref_prefix = "refs/";
1026                 strbuf_addstr(&branch_top, src_ref_prefix);
1027
1028                 git_config_set("core.bare", "true");
1029         } else {
1030                 strbuf_addf(&branch_top, "refs/remotes/%s/", option_origin);
1031         }
1032
1033         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top.buf);
1034         strbuf_addf(&key, "remote.%s.url", option_origin);
1035         git_config_set(key.buf, repo);
1036         strbuf_reset(&key);
1037
1038         if (option_required_reference.nr || option_optional_reference.nr)
1039                 setup_reference();
1040
1041         fetch_pattern = value.buf;
1042         refspec = parse_fetch_refspec(1, &fetch_pattern);
1043
1044         strbuf_reset(&value);
1045
1046         remote = remote_get(option_origin);
1047         transport = transport_get(remote, remote->url[0]);
1048         transport_set_verbosity(transport, option_verbosity, option_progress);
1049         transport->family = family;
1050
1051         path = get_repo_path(remote->url[0], &is_bundle);
1052         is_local = option_local != 0 && path && !is_bundle;
1053         if (is_local) {
1054                 if (option_depth)
1055                         warning(_("--depth is ignored in local clones; use file:// instead."));
1056                 if (option_since)
1057                         warning(_("--shallow-since is ignored in local clones; use file:// instead."));
1058                 if (option_not.nr)
1059                         warning(_("--shallow-exclude is ignored in local clones; use file:// instead."));
1060                 if (!access(mkpath("%s/shallow", path), F_OK)) {
1061                         if (option_local > 0)
1062                                 warning(_("source repository is shallow, ignoring --local"));
1063                         is_local = 0;
1064                 }
1065         }
1066         if (option_local > 0 && !is_local)
1067                 warning(_("--local is ignored"));
1068         transport->cloning = 1;
1069
1070         if (!transport->get_refs_list || (!is_local && !transport->fetch))
1071                 die(_("Don't know how to clone %s"), transport->url);
1072
1073         transport_set_option(transport, TRANS_OPT_KEEP, "yes");
1074
1075         if (option_depth)
1076                 transport_set_option(transport, TRANS_OPT_DEPTH,
1077                                      option_depth);
1078         if (option_since)
1079                 transport_set_option(transport, TRANS_OPT_DEEPEN_SINCE,
1080                                      option_since);
1081         if (option_not.nr)
1082                 transport_set_option(transport, TRANS_OPT_DEEPEN_NOT,
1083                                      (const char *)&option_not);
1084         if (option_single_branch)
1085                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
1086
1087         if (option_upload_pack)
1088                 transport_set_option(transport, TRANS_OPT_UPLOADPACK,
1089                                      option_upload_pack);
1090
1091         if (transport->smart_options && !deepen)
1092                 transport->smart_options->check_self_contained_and_connected = 1;
1093
1094         refs = transport_get_remote_refs(transport);
1095
1096         if (refs) {
1097                 mapped_refs = wanted_peer_refs(refs, refspec);
1098                 /*
1099                  * transport_get_remote_refs() may return refs with null sha-1
1100                  * in mapped_refs (see struct transport->get_refs_list
1101                  * comment). In that case we need fetch it early because
1102                  * remote_head code below relies on it.
1103                  *
1104                  * for normal clones, transport_get_remote_refs() should
1105                  * return reliable ref set, we can delay cloning until after
1106                  * remote HEAD check.
1107                  */
1108                 for (ref = refs; ref; ref = ref->next)
1109                         if (is_null_oid(&ref->old_oid)) {
1110                                 complete_refs_before_fetch = 0;
1111                                 break;
1112                         }
1113
1114                 if (!is_local && !complete_refs_before_fetch)
1115                         transport_fetch_refs(transport, mapped_refs);
1116
1117                 remote_head = find_ref_by_name(refs, "HEAD");
1118                 remote_head_points_at =
1119                         guess_remote_head(remote_head, mapped_refs, 0);
1120
1121                 if (option_branch) {
1122                         our_head_points_at =
1123                                 find_remote_branch(mapped_refs, option_branch);
1124
1125                         if (!our_head_points_at)
1126                                 die(_("Remote branch %s not found in upstream %s"),
1127                                     option_branch, option_origin);
1128                 }
1129                 else
1130                         our_head_points_at = remote_head_points_at;
1131         }
1132         else {
1133                 if (option_branch)
1134                         die(_("Remote branch %s not found in upstream %s"),
1135                                         option_branch, option_origin);
1136
1137                 warning(_("You appear to have cloned an empty repository."));
1138                 mapped_refs = NULL;
1139                 our_head_points_at = NULL;
1140                 remote_head_points_at = NULL;
1141                 remote_head = NULL;
1142                 option_no_checkout = 1;
1143                 if (!option_bare)
1144                         install_branch_config(0, "master", option_origin,
1145                                               "refs/heads/master");
1146         }
1147
1148         write_refspec_config(src_ref_prefix, our_head_points_at,
1149                         remote_head_points_at, &branch_top);
1150
1151         if (is_local)
1152                 clone_local(path, git_dir);
1153         else if (refs && complete_refs_before_fetch)
1154                 transport_fetch_refs(transport, mapped_refs);
1155
1156         update_remote_refs(refs, mapped_refs, remote_head_points_at,
1157                            branch_top.buf, reflog_msg.buf, transport, !is_local);
1158
1159         update_head(our_head_points_at, remote_head, reflog_msg.buf);
1160
1161         /*
1162          * We want to show progress for recursive submodule clones iff
1163          * we did so for the main clone. But only the transport knows
1164          * the final decision for this flag, so we need to rescue the value
1165          * before we free the transport.
1166          */
1167         submodule_progress = transport->progress;
1168
1169         transport_unlock_pack(transport);
1170         transport_disconnect(transport);
1171
1172         if (option_dissociate) {
1173                 close_all_packs();
1174                 dissociate_from_references();
1175         }
1176
1177         junk_mode = JUNK_LEAVE_REPO;
1178         err = checkout(submodule_progress);
1179
1180         strbuf_release(&reflog_msg);
1181         strbuf_release(&branch_top);
1182         strbuf_release(&key);
1183         strbuf_release(&value);
1184         junk_mode = JUNK_LEAVE_ALL;
1185
1186         free(refspec);
1187         return err;
1188 }