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