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 char *option_template, *option_depth;
  44 static char *option_origin = NULL;
  45 static char *option_branch = NULL;
  46 static const char *real_git_dir;
  47 static char *option_upload_pack = "git-upload-pack";
  48 static int option_verbosity;
  49 static int option_progress = -1;
  50 static struct string_list option_config;
  51 static struct string_list option_reference;
  52 static int option_dissociate;
  53
  54 static struct option builtin_clone_options[] = {
  55         OPT__VERBOSITY(&option_verbosity),
  56         OPT_BOOL(0, "progress", &option_progress,
  57                  N_("force progress reporting")),
  58         OPT_BOOL('n', "no-checkout", &option_no_checkout,
  59                  N_("don't create a checkout")),
  60         OPT_BOOL(0, "bare", &option_bare, N_("create a bare repository")),
  61         OPT_HIDDEN_BOOL(0, "naked", &option_bare,
  62                         N_("create a bare repository")),
  63         OPT_BOOL(0, "mirror", &option_mirror,
  64                  N_("create a mirror repository (implies bare)")),
  65         OPT_BOOL('l', "local", &option_local,
  66                 N_("to clone from a local repository")),
  67         OPT_BOOL(0, "no-hardlinks", &option_no_hardlinks,
  68                     N_("don't use local hardlinks, always copy")),
  69         OPT_BOOL('s', "shared", &option_shared,
  70                     N_("setup as shared repository")),
  71         OPT_BOOL(0, "recursive", &option_recursive,
  72                     N_("initialize submodules in the clone")),
  73         OPT_BOOL(0, "recurse-submodules", &option_recursive,
  74                     N_("initialize submodules in the clone")),
  75         OPT_STRING(0, "template", &option_template, N_("template-directory"),
  76                    N_("directory from which templates will be used")),
  77         OPT_STRING_LIST(0, "reference", &option_reference, N_("repo"),
  78                         N_("reference repository")),
  79         OPT_BOOL(0, "dissociate", &option_dissociate,
  80                  N_("use --reference only while cloning")),
  81         OPT_STRING('o', "origin", &option_origin, N_("name"),
  82                    N_("use <name> instead of 'origin' to track upstream")),
  83         OPT_STRING('b', "branch", &option_branch, N_("branch"),
  84                    N_("checkout <branch> instead of the remote's HEAD")),
  85         OPT_STRING('u', "upload-pack", &option_upload_pack, N_("path"),
  86                    N_("path to git-upload-pack on the remote")),
  87         OPT_STRING(0, "depth", &option_depth, N_("depth"),
  88                     N_("create a shallow clone of that depth")),
  89         OPT_BOOL(0, "single-branch", &option_single_branch,
  90                     N_("clone only one branch, HEAD or --branch")),
  91         OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
  92                    N_("separate git dir from working tree")),
  93         OPT_STRING_LIST('c', "config", &option_config, N_("key=value"),
  94                         N_("set config inside the new repository")),
  95         OPT_END()
  96 };
  97
  98 static const char *argv_submodule[] = {
  99         "submodule", "update", "--init", "--recursive", NULL
 100 };
 101
 102 static char *get_repo_path(const char *repo, int *is_bundle)
 103 {
 104         static char *suffix[] = { "/.git", "", ".git/.git", ".git" };
 105         static char *bundle_suffix[] = { ".bundle", "" };
 106         struct stat st;
 107         int i;
 108
 109         for (i = 0; i < ARRAY_SIZE(suffix); i++) {
 110                 const char *path;
 111                 path = mkpath("%s%s", repo, suffix[i]);
 112                 if (stat(path, &st))
 113                         continue;
 114                 if (S_ISDIR(st.st_mode) && is_git_directory(path)) {
 115                         *is_bundle = 0;
 116                         return xstrdup(absolute_path(path));
 117                 } else if (S_ISREG(st.st_mode) && st.st_size > 8) {
 118                         /* Is it a "gitfile"? */
 119                         char signature[8];
 120                         int len, fd = open(path, O_RDONLY);
 121                         if (fd < 0)
 122                                 continue;
 123                         len = read_in_full(fd, signature, 8);
 124                         close(fd);
 125                         if (len != 8 || strncmp(signature, "gitdir: ", 8))
 126                                 continue;
 127                         path = read_gitfile(path);
 128                         if (path) {
 129                                 *is_bundle = 0;
 130                                 return xstrdup(absolute_path(path));
 131                         }
 132                 }
 133         }
 134
 135         for (i = 0; i < ARRAY_SIZE(bundle_suffix); i++) {
 136                 const char *path;
 137                 path = mkpath("%s%s", repo, bundle_suffix[i]);
 138                 if (!stat(path, &st) && S_ISREG(st.st_mode)) {
 139                         *is_bundle = 1;
 140                         return xstrdup(absolute_path(path));
 141                 }
 142         }
 143
 144         return NULL;
 145 }
 146
 147 static char *guess_dir_name(const char *repo, int is_bundle, int is_bare)
 148 {
 149         const char *end = repo + strlen(repo), *start;
 150         size_t len;
 151         char *dir;
 152
 153         /*
 154          * Strip trailing spaces, slashes and /.git
 155          */
 156         while (repo < end && (is_dir_sep(end[-1]) || isspace(end[-1])))
 157                 end--;
 158         if (end - repo > 5 && is_dir_sep(end[-5]) &&
 159             !strncmp(end - 4, ".git", 4)) {
 160                 end -= 5;
 161                 while (repo < end && is_dir_sep(end[-1]))
 162                         end--;
 163         }
 164
 165         /*
 166          * Find last component, but be prepared that repo could have
 167          * the form  "remote.example.com:foo.git", i.e. no slash
 168          * in the directory part.
 169          */
 170         start = end;
 171         while (repo < start && !is_dir_sep(start[-1]) && start[-1] != ':')
 172                 start--;
 173
 174         /*
 175          * Strip .{bundle,git}.
 176          */
 177         len = end - start;
 178         strip_suffix_mem(start, &len, is_bundle ? ".bundle" : ".git");
 179
 180         if (is_bare)
 181                 dir = xstrfmt("%.*s.git", (int)len, start);
 182         else
 183                 dir = xstrndup(start, len);
 184         /*
 185          * Replace sequences of 'control' characters and whitespace
 186          * with one ascii space, remove leading and trailing spaces.
 187          */
 188         if (*dir) {
 189                 char *out = dir;
 190                 int prev_space = 1 /* strip leading whitespace */;
 191                 for (end = dir; *end; ++end) {
 192                         char ch = *end;
 193                         if ((unsigned char)ch < '\x20')
 194                                 ch = '\x20';
 195                         if (isspace(ch)) {
 196                                 if (prev_space)
 197                                         continue;
 198                                 prev_space = 1;
 199                         } else
 200                                 prev_space = 0;
 201                         *out++ = ch;
 202                 }
 203                 *out = '\0';
 204                 if (out > dir && prev_space)
 205                         out[-1] = '\0';
 206         }
 207         return dir;
 208 }
 209
 210 static void strip_trailing_slashes(char *dir)
 211 {
 212         char *end = dir + strlen(dir);
 213
 214         while (dir < end - 1 && is_dir_sep(end[-1]))
 215                 end--;
 216         *end = '\0';
 217 }
 218
 219 static int add_one_reference(struct string_list_item *item, void *cb_data)
 220 {
 221         char *ref_git;
 222         const char *repo;
 223         struct strbuf alternate = STRBUF_INIT;
 224
 225         /* Beware: read_gitfile(), real_path() and mkpath() return static buffer */
 226         ref_git = xstrdup(real_path(item->string));
 227
 228         repo = read_gitfile(ref_git);
 229         if (!repo)
 230                 repo = read_gitfile(mkpath("%s/.git", ref_git));
 231         if (repo) {
 232                 free(ref_git);
 233                 ref_git = xstrdup(repo);
 234         }
 235
 236         if (!repo && is_directory(mkpath("%s/.git/objects", ref_git))) {
 237                 char *ref_git_git = mkpathdup("%s/.git", ref_git);
 238                 free(ref_git);
 239                 ref_git = ref_git_git;
 240         } else if (!is_directory(mkpath("%s/objects", ref_git)))
 241                 die(_("reference repository '%s' is not a local repository."),
 242                     item->string);
 243
 244         if (!access(mkpath("%s/shallow", ref_git), F_OK))
 245                 die(_("reference repository '%s' is shallow"), item->string);
 246
 247         if (!access(mkpath("%s/info/grafts", ref_git), F_OK))
 248                 die(_("reference repository '%s' is grafted"), item->string);
 249
 250         strbuf_addf(&alternate, "%s/objects", ref_git);
 251         add_to_alternates_file(alternate.buf);
 252         strbuf_release(&alternate);
 253         free(ref_git);
 254         return 0;
 255 }
 256
 257 static void setup_reference(void)
 258 {
 259         for_each_string_list(&option_reference, add_one_reference, NULL);
 260 }
 261
 262 static void copy_alternates(struct strbuf *src, struct strbuf *dst,
 263                             const char *src_repo)
 264 {
 265         /*
 266          * Read from the source objects/info/alternates file
 267          * and copy the entries to corresponding file in the
 268          * destination repository with add_to_alternates_file().
 269          * Both src and dst have "$path/objects/info/alternates".
 270          *
 271          * Instead of copying bit-for-bit from the original,
 272          * we need to append to existing one so that the already
 273          * created entry via "clone -s" is not lost, and also
 274          * to turn entries with paths relative to the original
 275          * absolute, so that they can be used in the new repository.
 276          */
 277         FILE *in = fopen(src->buf, "r");
 278         struct strbuf line = STRBUF_INIT;
 279
 280         while (strbuf_getline(&line, in, '\n') != EOF) {
 281                 char *abs_path;
 282                 if (!line.len || line.buf[0] == '#')
 283                         continue;
 284                 if (is_absolute_path(line.buf)) {
 285                         add_to_alternates_file(line.buf);
 286                         continue;
 287                 }
 288                 abs_path = mkpathdup("%s/objects/%s", src_repo, line.buf);
 289                 normalize_path_copy(abs_path, abs_path);
 290                 add_to_alternates_file(abs_path);
 291                 free(abs_path);
 292         }
 293         strbuf_release(&line);
 294         fclose(in);
 295 }
 296
 297 static void copy_or_link_directory(struct strbuf *src, struct strbuf *dest,
 298                                    const char *src_repo, int src_baselen)
 299 {
 300         struct dirent *de;
 301         struct stat buf;
 302         int src_len, dest_len;
 303         DIR *dir;
 304
 305         dir = opendir(src->buf);
 306         if (!dir)
 307                 die_errno(_("failed to open '%s'"), src->buf);
 308
 309         if (mkdir(dest->buf, 0777)) {
 310                 if (errno != EEXIST)
 311                         die_errno(_("failed to create directory '%s'"), dest->buf);
 312                 else if (stat(dest->buf, &buf))
 313                         die_errno(_("failed to stat '%s'"), dest->buf);
 314                 else if (!S_ISDIR(buf.st_mode))
 315                         die(_("%s exists and is not a directory"), dest->buf);
 316         }
 317
 318         strbuf_addch(src, '/');
 319         src_len = src->len;
 320         strbuf_addch(dest, '/');
 321         dest_len = dest->len;
 322
 323         while ((de = readdir(dir)) != NULL) {
 324                 strbuf_setlen(src, src_len);
 325                 strbuf_addstr(src, de->d_name);
 326                 strbuf_setlen(dest, dest_len);
 327                 strbuf_addstr(dest, de->d_name);
 328                 if (stat(src->buf, &buf)) {
 329                         warning (_("failed to stat %s\n"), src->buf);
 330                         continue;
 331                 }
 332                 if (S_ISDIR(buf.st_mode)) {
 333                         if (de->d_name[0] != '.')
 334                                 copy_or_link_directory(src, dest,
 335                                                        src_repo, src_baselen);
 336                         continue;
 337                 }
 338
 339                 /* Files that cannot be copied bit-for-bit... */
 340                 if (!strcmp(src->buf + src_baselen, "/info/alternates")) {
 341                         copy_alternates(src, dest, src_repo);
 342                         continue;
 343                 }
 344
 345                 if (unlink(dest->buf) && errno != ENOENT)
 346                         die_errno(_("failed to unlink '%s'"), dest->buf);
 347                 if (!option_no_hardlinks) {
 348                         if (!link(src->buf, dest->buf))
 349                                 continue;
 350                         if (option_local > 0)
 351                                 die_errno(_("failed to create link '%s'"), dest->buf);
 352                         option_no_hardlinks = 1;
 353                 }
 354                 if (copy_file_with_time(dest->buf, src->buf, 0666))
 355                         die_errno(_("failed to copy file to '%s'"), dest->buf);
 356         }
 357         closedir(dir);
 358 }
 359
 360 static void clone_local(const char *src_repo, const char *dest_repo)
 361 {
 362         if (option_shared) {
 363                 struct strbuf alt = STRBUF_INIT;
 364                 strbuf_addf(&alt, "%s/objects", src_repo);
 365                 add_to_alternates_file(alt.buf);
 366                 strbuf_release(&alt);
 367         } else {
 368                 struct strbuf src = STRBUF_INIT;
 369                 struct strbuf dest = STRBUF_INIT;
 370                 strbuf_addf(&src, "%s/objects", src_repo);
 371                 strbuf_addf(&dest, "%s/objects", dest_repo);
 372                 copy_or_link_directory(&src, &dest, src_repo, src.len);
 373                 strbuf_release(&src);
 374                 strbuf_release(&dest);
 375         }
 376
 377         if (0 <= option_verbosity)
 378                 fprintf(stderr, _("done.\n"));
 379 }
 380
 381 static const char *junk_work_tree;
 382 static const char *junk_git_dir;
 383 static enum {
 384         JUNK_LEAVE_NONE,
 385         JUNK_LEAVE_REPO,
 386         JUNK_LEAVE_ALL
 387 } junk_mode = JUNK_LEAVE_NONE;
 388
 389 static const char junk_leave_repo_msg[] =
 390 N_("Clone succeeded, but checkout failed.\n"
 391    "You can inspect what was checked out with 'git status'\n"
 392    "and retry the checkout with 'git checkout -f HEAD'\n");
 393
 394 static void remove_junk(void)
 395 {
 396         struct strbuf sb = STRBUF_INIT;
 397
 398         switch (junk_mode) {
 399         case JUNK_LEAVE_REPO:
 400                 warning("%s", _(junk_leave_repo_msg));
 401                 /* fall-through */
 402         case JUNK_LEAVE_ALL:
 403                 return;
 404         default:
 405                 /* proceed to removal */
 406                 break;
 407         }
 408
 409         if (junk_git_dir) {
 410                 strbuf_addstr(&sb, junk_git_dir);
 411                 remove_dir_recursively(&sb, 0);
 412                 strbuf_reset(&sb);
 413         }
 414         if (junk_work_tree) {
 415                 strbuf_addstr(&sb, junk_work_tree);
 416                 remove_dir_recursively(&sb, 0);
 417                 strbuf_reset(&sb);
 418         }
 419 }
 420
 421 static void remove_junk_on_signal(int signo)
 422 {
 423         remove_junk();
 424         sigchain_pop(signo);
 425         raise(signo);
 426 }
 427
 428 static struct ref *find_remote_branch(const struct ref *refs, const char *branch)
 429 {
 430         struct ref *ref;
 431         struct strbuf head = STRBUF_INIT;
 432         strbuf_addstr(&head, "refs/heads/");
 433         strbuf_addstr(&head, branch);
 434         ref = find_ref_by_name(refs, head.buf);
 435         strbuf_release(&head);
 436
 437         if (ref)
 438                 return ref;
 439
 440         strbuf_addstr(&head, "refs/tags/");
 441         strbuf_addstr(&head, branch);
 442         ref = find_ref_by_name(refs, head.buf);
 443         strbuf_release(&head);
 444
 445         return ref;
 446 }
 447
 448 static struct ref *wanted_peer_refs(const struct ref *refs,
 449                 struct refspec *refspec)
 450 {
 451         struct ref *head = copy_ref(find_ref_by_name(refs, "HEAD"));
 452         struct ref *local_refs = head;
 453         struct ref **tail = head ? &head->next : &local_refs;
 454
 455         if (option_single_branch) {
 456                 struct ref *remote_head = NULL;
 457
 458                 if (!option_branch)
 459                         remote_head = guess_remote_head(head, refs, 0);
 460                 else {
 461                         local_refs = NULL;
 462                         tail = &local_refs;
 463                         remote_head = copy_ref(find_remote_branch(refs, option_branch));
 464                 }
 465
 466                 if (!remote_head && option_branch)
 467                         warning(_("Could not find remote branch %s to clone."),
 468                                 option_branch);
 469                 else {
 470                         get_fetch_map(remote_head, refspec, &tail, 0);
 471
 472                         /* if --branch=tag, pull the requested tag explicitly */
 473                         get_fetch_map(remote_head, tag_refspec, &tail, 0);
 474                 }
 475         } else
 476                 get_fetch_map(refs, refspec, &tail, 0);
 477
 478         if (!option_mirror && !option_single_branch)
 479                 get_fetch_map(refs, tag_refspec, &tail, 0);
 480
 481         return local_refs;
 482 }
 483
 484 static void write_remote_refs(const struct ref *local_refs)
 485 {
 486         const struct ref *r;
 487
 488         struct ref_transaction *t;
 489         struct strbuf err = STRBUF_INIT;
 490
 491         t = ref_transaction_begin(&err);
 492         if (!t)
 493                 die("%s", err.buf);
 494
 495         for (r = local_refs; r; r = r->next) {
 496                 if (!r->peer_ref)
 497                         continue;
 498                 if (ref_transaction_create(t, r->peer_ref->name, r->old_sha1,
 499                                            0, NULL, &err))
 500                         die("%s", err.buf);
 501         }
 502
 503         if (initial_ref_transaction_commit(t, &err))
 504                 die("%s", err.buf);
 505
 506         strbuf_release(&err);
 507         ref_transaction_free(t);
 508 }
 509
 510 static void write_followtags(const struct ref *refs, const char *msg)
 511 {
 512         const struct ref *ref;
 513         for (ref = refs; ref; ref = ref->next) {
 514                 if (!starts_with(ref->name, "refs/tags/"))
 515                         continue;
 516                 if (ends_with(ref->name, "^{}"))
 517                         continue;
 518                 if (!has_sha1_file(ref->old_sha1))
 519                         continue;
 520                 update_ref(msg, ref->name, ref->old_sha1,
 521                            NULL, 0, UPDATE_REFS_DIE_ON_ERR);
 522         }
 523 }
 524
 525 static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
 526 {
 527         struct ref **rm = cb_data;
 528         struct ref *ref = *rm;
 529
 530         /*
 531          * Skip anything missing a peer_ref, which we are not
 532          * actually going to write a ref for.
 533          */
 534         while (ref && !ref->peer_ref)
 535                 ref = ref->next;
 536         /* Returning -1 notes "end of list" to the caller. */
 537         if (!ref)
 538                 return -1;
 539
 540         hashcpy(sha1, ref->old_sha1);
 541         *rm = ref->next;
 542         return 0;
 543 }
 544
 545 static void update_remote_refs(const struct ref *refs,
 546                                const struct ref *mapped_refs,
 547                                const struct ref *remote_head_points_at,
 548                                const char *branch_top,
 549                                const char *msg,
 550                                struct transport *transport,
 551                                int check_connectivity)
 552 {
 553         const struct ref *rm = mapped_refs;
 554
 555         if (check_connectivity) {
 556                 if (transport->progress)
 557                         fprintf(stderr, _("Checking connectivity... "));
 558                 if (check_everything_connected_with_transport(iterate_ref_map,
 559                                                               0, &rm, transport))
 560                         die(_("remote did not send all necessary objects"));
 561                 if (transport->progress)
 562                         fprintf(stderr, _("done.\n"));
 563         }
 564
 565         if (refs) {
 566                 write_remote_refs(mapped_refs);
 567                 if (option_single_branch)
 568                         write_followtags(refs, msg);
 569         }
 570
 571         if (remote_head_points_at && !option_bare) {
 572                 struct strbuf head_ref = STRBUF_INIT;
 573                 strbuf_addstr(&head_ref, branch_top);
 574                 strbuf_addstr(&head_ref, "HEAD");
 575                 create_symref(head_ref.buf,
 576                               remote_head_points_at->peer_ref->name,
 577                               msg);
 578         }
 579 }
 580
 581 static void update_head(const struct ref *our, const struct ref *remote,
 582                         const char *msg)
 583 {
 584         const char *head;
 585         if (our && skip_prefix(our->name, "refs/heads/", &head)) {
 586                 /* Local default branch link */
 587                 create_symref("HEAD", our->name, NULL);
 588                 if (!option_bare) {
 589                         update_ref(msg, "HEAD", our->old_sha1, NULL, 0,
 590                                    UPDATE_REFS_DIE_ON_ERR);
 591                         install_branch_config(0, head, option_origin, our->name);
 592                 }
 593         } else if (our) {
 594                 struct commit *c = lookup_commit_reference(our->old_sha1);
 595                 /* --branch specifies a non-branch (i.e. tags), detach HEAD */
 596                 update_ref(msg, "HEAD", c->object.sha1,
 597                            NULL, REF_NODEREF, UPDATE_REFS_DIE_ON_ERR);
 598         } else if (remote) {
 599                 /*
 600                  * We know remote HEAD points to a non-branch, or
 601                  * HEAD points to a branch but we don't know which one.
 602                  * Detach HEAD in all these cases.
 603                  */
 604                 update_ref(msg, "HEAD", remote->old_sha1,
 605                            NULL, REF_NODEREF, UPDATE_REFS_DIE_ON_ERR);
 606         }
 607 }
 608
 609 static int checkout(void)
 610 {
 611         unsigned char sha1[20];
 612         char *head;
 613         struct lock_file *lock_file;
 614         struct unpack_trees_options opts;
 615         struct tree *tree;
 616         struct tree_desc t;
 617         int err = 0;
 618
 619         if (option_no_checkout)
 620                 return 0;
 621
 622         head = resolve_refdup("HEAD", RESOLVE_REF_READING, sha1, NULL);
 623         if (!head) {
 624                 warning(_("remote HEAD refers to nonexistent ref, "
 625                           "unable to checkout.\n"));
 626                 return 0;
 627         }
 628         if (!strcmp(head, "HEAD")) {
 629                 if (advice_detached_head)
 630                         detach_advice(sha1_to_hex(sha1));
 631         } else {
 632                 if (!starts_with(head, "refs/heads/"))
 633                         die(_("HEAD not found below refs/heads!"));
 634         }
 635         free(head);
 636
 637         /* We need to be in the new work tree for the checkout */
 638         setup_work_tree();
 639
 640         lock_file = xcalloc(1, sizeof(struct lock_file));
 641         hold_locked_index(lock_file, 1);
 642
 643         memset(&opts, 0, sizeof opts);
 644         opts.update = 1;
 645         opts.merge = 1;
 646         opts.fn = oneway_merge;
 647         opts.verbose_update = (option_verbosity >= 0);
 648         opts.src_index = &the_index;
 649         opts.dst_index = &the_index;
 650
 651         tree = parse_tree_indirect(sha1);
 652         parse_tree(tree);
 653         init_tree_desc(&t, tree->buffer, tree->size);
 654         if (unpack_trees(1, &t, &opts) < 0)
 655                 die(_("unable to checkout working tree"));
 656
 657         if (write_locked_index(&the_index, lock_file, COMMIT_LOCK))
 658                 die(_("unable to write new index file"));
 659
 660         err |= run_hook_le(NULL, "post-checkout", sha1_to_hex(null_sha1),
 661                            sha1_to_hex(sha1), "1", NULL);
 662
 663         if (!err && option_recursive)
 664                 err = run_command_v_opt(argv_submodule, RUN_GIT_CMD);
 665
 666         return err;
 667 }
 668
 669 static int write_one_config(const char *key, const char *value, void *data)
 670 {
 671         return git_config_set_multivar(key, value ? value : "true", "^$", 0);
 672 }
 673
 674 static void write_config(struct string_list *config)
 675 {
 676         int i;
 677
 678         for (i = 0; i < config->nr; i++) {
 679                 if (git_config_parse_parameter(config->items[i].string,
 680                                                write_one_config, NULL) < 0)
 681                         die("unable to write parameters to config file");
 682         }
 683 }
 684
 685 static void write_refspec_config(const char *src_ref_prefix,
 686                 const struct ref *our_head_points_at,
 687                 const struct ref *remote_head_points_at,
 688                 struct strbuf *branch_top)
 689 {
 690         struct strbuf key = STRBUF_INIT;
 691         struct strbuf value = STRBUF_INIT;
 692
 693         if (option_mirror || !option_bare) {
 694                 if (option_single_branch && !option_mirror) {
 695                         if (option_branch) {
 696                                 if (starts_with(our_head_points_at->name, "refs/tags/"))
 697                                         strbuf_addf(&value, "+%s:%s", our_head_points_at->name,
 698                                                 our_head_points_at->name);
 699                                 else
 700                                         strbuf_addf(&value, "+%s:%s%s", our_head_points_at->name,
 701                                                 branch_top->buf, option_branch);
 702                         } else if (remote_head_points_at) {
 703                                 const char *head = remote_head_points_at->name;
 704                                 if (!skip_prefix(head, "refs/heads/", &head))
 705                                         die("BUG: remote HEAD points at non-head?");
 706
 707                                 strbuf_addf(&value, "+%s:%s%s", remote_head_points_at->name,
 708                                                 branch_top->buf, head);
 709                         }
 710                         /*
 711                          * otherwise, the next "git fetch" will
 712                          * simply fetch from HEAD without updating
 713                          * any remote-tracking branch, which is what
 714                          * we want.
 715                          */
 716                 } else {
 717                         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top->buf);
 718                 }
 719                 /* Configure the remote */
 720                 if (value.len) {
 721                         strbuf_addf(&key, "remote.%s.fetch", option_origin);
 722                         git_config_set_multivar(key.buf, value.buf, "^$", 0);
 723                         strbuf_reset(&key);
 724
 725                         if (option_mirror) {
 726                                 strbuf_addf(&key, "remote.%s.mirror", option_origin);
 727                                 git_config_set(key.buf, "true");
 728                                 strbuf_reset(&key);
 729                         }
 730                 }
 731         }
 732
 733         strbuf_release(&key);
 734         strbuf_release(&value);
 735 }
 736
 737 static void dissociate_from_references(void)
 738 {
 739         static const char* argv[] = { "repack", "-a", "-d", NULL };
 740
 741         if (run_command_v_opt(argv, RUN_GIT_CMD|RUN_COMMAND_NO_STDIN))
 742                 die(_("cannot repack to clean up"));
 743         if (unlink(git_path("objects/info/alternates")) && errno != ENOENT)
 744                 die_errno(_("cannot unlink temporary alternates file"));
 745 }
 746
 747 int cmd_clone(int argc, const char **argv, const char *prefix)
 748 {
 749         int is_bundle = 0, is_local;
 750         struct stat buf;
 751         const char *repo_name, *repo, *work_tree, *git_dir;
 752         char *path, *dir;
 753         int dest_exists;
 754         const struct ref *refs, *remote_head;
 755         const struct ref *remote_head_points_at;
 756         const struct ref *our_head_points_at;
 757         struct ref *mapped_refs;
 758         const struct ref *ref;
 759         struct strbuf key = STRBUF_INIT, value = STRBUF_INIT;
 760         struct strbuf branch_top = STRBUF_INIT, reflog_msg = STRBUF_INIT;
 761         struct transport *transport = NULL;
 762         const char *src_ref_prefix = "refs/heads/";
 763         struct remote *remote;
 764         int err = 0, complete_refs_before_fetch = 1;
 765
 766         struct refspec *refspec;
 767         const char *fetch_pattern;
 768
 769         packet_trace_identity("clone");
 770         argc = parse_options(argc, argv, prefix, builtin_clone_options,
 771                              builtin_clone_usage, 0);
 772
 773         if (argc > 2)
 774                 usage_msg_opt(_("Too many arguments."),
 775                         builtin_clone_usage, builtin_clone_options);
 776
 777         if (argc == 0)
 778                 usage_msg_opt(_("You must specify a repository to clone."),
 779                         builtin_clone_usage, builtin_clone_options);
 780
 781         if (option_single_branch == -1)
 782                 option_single_branch = option_depth ? 1 : 0;
 783
 784         if (option_mirror)
 785                 option_bare = 1;
 786
 787         if (option_bare) {
 788                 if (option_origin)
 789                         die(_("--bare and --origin %s options are incompatible."),
 790                             option_origin);
 791                 if (real_git_dir)
 792                         die(_("--bare and --separate-git-dir are incompatible."));
 793                 option_no_checkout = 1;
 794         }
 795
 796         if (!option_origin)
 797                 option_origin = "origin";
 798
 799         repo_name = argv[0];
 800
 801         path = get_repo_path(repo_name, &is_bundle);
 802         if (path)
 803                 repo = xstrdup(absolute_path(repo_name));
 804         else if (!strchr(repo_name, ':'))
 805                 die(_("repository '%s' does not exist"), repo_name);
 806         else
 807                 repo = repo_name;
 808
 809         /* no need to be strict, transport_set_option() will validate it again */
 810         if (option_depth && atoi(option_depth) < 1)
 811                 die(_("depth %s is not a positive number"), option_depth);
 812
 813         if (argc == 2)
 814                 dir = xstrdup(argv[1]);
 815         else
 816                 dir = guess_dir_name(repo_name, is_bundle, option_bare);
 817         strip_trailing_slashes(dir);
 818
 819         dest_exists = !stat(dir, &buf);
 820         if (dest_exists && !is_empty_dir(dir))
 821                 die(_("destination path '%s' already exists and is not "
 822                         "an empty directory."), dir);
 823
 824         strbuf_addf(&reflog_msg, "clone: from %s", repo);
 825
 826         if (option_bare)
 827                 work_tree = NULL;
 828         else {
 829                 work_tree = getenv("GIT_WORK_TREE");
 830                 if (work_tree && !stat(work_tree, &buf))
 831                         die(_("working tree '%s' already exists."), work_tree);
 832         }
 833
 834         if (option_bare || work_tree)
 835                 git_dir = xstrdup(dir);
 836         else {
 837                 work_tree = dir;
 838                 git_dir = mkpathdup("%s/.git", dir);
 839         }
 840
 841         atexit(remove_junk);
 842         sigchain_push_common(remove_junk_on_signal);
 843
 844         if (!option_bare) {
 845                 if (safe_create_leading_directories_const(work_tree) < 0)
 846                         die_errno(_("could not create leading directories of '%s'"),
 847                                   work_tree);
 848                 if (!dest_exists && mkdir(work_tree, 0777))
 849                         die_errno(_("could not create work tree dir '%s'"),
 850                                   work_tree);
 851                 junk_work_tree = work_tree;
 852                 set_git_work_tree(work_tree);
 853         }
 854
 855         junk_git_dir = git_dir;
 856         if (safe_create_leading_directories_const(git_dir) < 0)
 857                 die(_("could not create leading directories of '%s'"), git_dir);
 858
 859         set_git_dir_init(git_dir, real_git_dir, 0);
 860         if (real_git_dir) {
 861                 git_dir = real_git_dir;
 862                 junk_git_dir = real_git_dir;
 863         }
 864
 865         if (0 <= option_verbosity) {
 866                 if (option_bare)
 867                         fprintf(stderr, _("Cloning into bare repository '%s'...\n"), dir);
 868                 else
 869                         fprintf(stderr, _("Cloning into '%s'...\n"), dir);
 870         }
 871         init_db(option_template, INIT_DB_QUIET);
 872         write_config(&option_config);
 873
 874         git_config(git_default_config, NULL);
 875
 876         if (option_bare) {
 877                 if (option_mirror)
 878                         src_ref_prefix = "refs/";
 879                 strbuf_addstr(&branch_top, src_ref_prefix);
 880
 881                 git_config_set("core.bare", "true");
 882         } else {
 883                 strbuf_addf(&branch_top, "refs/remotes/%s/", option_origin);
 884         }
 885
 886         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top.buf);
 887         strbuf_addf(&key, "remote.%s.url", option_origin);
 888         git_config_set(key.buf, repo);
 889         strbuf_reset(&key);
 890
 891         if (option_reference.nr)
 892                 setup_reference();
 893         else if (option_dissociate) {
 894                 warning(_("--dissociate given, but there is no --reference"));
 895                 option_dissociate = 0;
 896         }
 897
 898         fetch_pattern = value.buf;
 899         refspec = parse_fetch_refspec(1, &fetch_pattern);
 900
 901         strbuf_reset(&value);
 902
 903         remote = remote_get(option_origin);
 904         transport = transport_get(remote, remote->url[0]);
 905         transport_set_verbosity(transport, option_verbosity, option_progress);
 906
 907         path = get_repo_path(remote->url[0], &is_bundle);
 908         is_local = option_local != 0 && path && !is_bundle;
 909         if (is_local) {
 910                 if (option_depth)
 911                         warning(_("--depth is ignored in local clones; use file:// instead."));
 912                 if (!access(mkpath("%s/shallow", path), F_OK)) {
 913                         if (option_local > 0)
 914                                 warning(_("source repository is shallow, ignoring --local"));
 915                         is_local = 0;
 916                 }
 917         }
 918         if (option_local > 0 && !is_local)
 919                 warning(_("--local is ignored"));
 920         transport->cloning = 1;
 921
 922         if (!transport->get_refs_list || (!is_local && !transport->fetch))
 923                 die(_("Don't know how to clone %s"), transport->url);
 924
 925         transport_set_option(transport, TRANS_OPT_KEEP, "yes");
 926
 927         if (option_depth)
 928                 transport_set_option(transport, TRANS_OPT_DEPTH,
 929                                      option_depth);
 930         if (option_single_branch)
 931                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
 932
 933         if (option_upload_pack)
 934                 transport_set_option(transport, TRANS_OPT_UPLOADPACK,
 935                                      option_upload_pack);
 936
 937         if (transport->smart_options && !option_depth)
 938                 transport->smart_options->check_self_contained_and_connected = 1;
 939
 940         refs = transport_get_remote_refs(transport);
 941
 942         if (refs) {
 943                 mapped_refs = wanted_peer_refs(refs, refspec);
 944                 /*
 945                  * transport_get_remote_refs() may return refs with null sha-1
 946                  * in mapped_refs (see struct transport->get_refs_list
 947                  * comment). In that case we need fetch it early because
 948                  * remote_head code below relies on it.
 949                  *
 950                  * for normal clones, transport_get_remote_refs() should
 951                  * return reliable ref set, we can delay cloning until after
 952                  * remote HEAD check.
 953                  */
 954                 for (ref = refs; ref; ref = ref->next)
 955                         if (is_null_sha1(ref->old_sha1)) {
 956                                 complete_refs_before_fetch = 0;
 957                                 break;
 958                         }
 959
 960                 if (!is_local && !complete_refs_before_fetch)
 961                         transport_fetch_refs(transport, mapped_refs);
 962
 963                 remote_head = find_ref_by_name(refs, "HEAD");
 964                 remote_head_points_at =
 965                         guess_remote_head(remote_head, mapped_refs, 0);
 966
 967                 if (option_branch) {
 968                         our_head_points_at =
 969                                 find_remote_branch(mapped_refs, option_branch);
 970
 971                         if (!our_head_points_at)
 972                                 die(_("Remote branch %s not found in upstream %s"),
 973                                     option_branch, option_origin);
 974                 }
 975                 else
 976                         our_head_points_at = remote_head_points_at;
 977         }
 978         else {
 979                 if (option_branch)
 980                         die(_("Remote branch %s not found in upstream %s"),
 981                                         option_branch, option_origin);
 982
 983                 warning(_("You appear to have cloned an empty repository."));
 984                 mapped_refs = NULL;
 985                 our_head_points_at = NULL;
 986                 remote_head_points_at = NULL;
 987                 remote_head = NULL;
 988                 option_no_checkout = 1;
 989                 if (!option_bare)
 990                         install_branch_config(0, "master", option_origin,
 991                                               "refs/heads/master");
 992         }
 993
 994         write_refspec_config(src_ref_prefix, our_head_points_at,
 995                         remote_head_points_at, &branch_top);
 996
 997         if (is_local)
 998                 clone_local(path, git_dir);
 999         else if (refs && complete_refs_before_fetch)
1000                 transport_fetch_refs(transport, mapped_refs);
1001
1002         update_remote_refs(refs, mapped_refs, remote_head_points_at,
1003                            branch_top.buf, reflog_msg.buf, transport, !is_local);
1004
1005         update_head(our_head_points_at, remote_head, reflog_msg.buf);
1006
1007         transport_unlock_pack(transport);
1008         transport_disconnect(transport);
1009
1010         if (option_dissociate)
1011                 dissociate_from_references();
1012
1013         junk_mode = JUNK_LEAVE_REPO;
1014         err = checkout();
1015
1016         strbuf_release(&reflog_msg);
1017         strbuf_release(&branch_top);
1018         strbuf_release(&key);
1019         strbuf_release(&value);
1020         junk_mode = JUNK_LEAVE_ALL;
1021
1022         free(refspec);
1023         return err;
1024 }