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         char *dir;
 151
 152         /*
 153          * Strip trailing spaces, slashes and /.git
 154          */
 155         while (repo < end && (is_dir_sep(end[-1]) || isspace(end[-1])))
 156                 end--;
 157         if (end - repo > 5 && is_dir_sep(end[-5]) &&
 158             !strncmp(end - 4, ".git", 4)) {
 159                 end -= 5;
 160                 while (repo < end && is_dir_sep(end[-1]))
 161                         end--;
 162         }
 163
 164         /*
 165          * Find last component, but be prepared that repo could have
 166          * the form  "remote.example.com:foo.git", i.e. no slash
 167          * in the directory part.
 168          */
 169         start = end;
 170         while (repo < start && !is_dir_sep(start[-1]) && start[-1] != ':')
 171                 start--;
 172
 173         /*
 174          * Strip .{bundle,git}.
 175          */
 176         if (is_bundle) {
 177                 if (end - start > 7 && !strncmp(end - 7, ".bundle", 7))
 178                         end -= 7;
 179         } else {
 180                 if (end - start > 4 && !strncmp(end - 4, ".git", 4))
 181                         end -= 4;
 182         }
 183
 184         if (is_bare) {
 185                 struct strbuf result = STRBUF_INIT;
 186                 strbuf_addf(&result, "%.*s.git", (int)(end - start), start);
 187                 dir = strbuf_detach(&result, NULL);
 188         } else
 189                 dir = xstrndup(start, end - start);
 190         /*
 191          * Replace sequences of 'control' characters and whitespace
 192          * with one ascii space, remove leading and trailing spaces.
 193          */
 194         if (*dir) {
 195                 char *out = dir;
 196                 int prev_space = 1 /* strip leading whitespace */;
 197                 for (end = dir; *end; ++end) {
 198                         char ch = *end;
 199                         if ((unsigned char)ch < '\x20')
 200                                 ch = '\x20';
 201                         if (isspace(ch)) {
 202                                 if (prev_space)
 203                                         continue;
 204                                 prev_space = 1;
 205                         } else
 206                                 prev_space = 0;
 207                         *out++ = ch;
 208                 }
 209                 *out = '\0';
 210                 if (out > dir && prev_space)
 211                         out[-1] = '\0';
 212         }
 213         return dir;
 214 }
 215
 216 static void strip_trailing_slashes(char *dir)
 217 {
 218         char *end = dir + strlen(dir);
 219
 220         while (dir < end - 1 && is_dir_sep(end[-1]))
 221                 end--;
 222         *end = '\0';
 223 }
 224
 225 static int add_one_reference(struct string_list_item *item, void *cb_data)
 226 {
 227         char *ref_git;
 228         const char *repo;
 229         struct strbuf alternate = STRBUF_INIT;
 230
 231         /* Beware: read_gitfile(), real_path() and mkpath() return static buffer */
 232         ref_git = xstrdup(real_path(item->string));
 233
 234         repo = read_gitfile(ref_git);
 235         if (!repo)
 236                 repo = read_gitfile(mkpath("%s/.git", ref_git));
 237         if (repo) {
 238                 free(ref_git);
 239                 ref_git = xstrdup(repo);
 240         }
 241
 242         if (!repo && is_directory(mkpath("%s/.git/objects", ref_git))) {
 243                 char *ref_git_git = mkpathdup("%s/.git", ref_git);
 244                 free(ref_git);
 245                 ref_git = ref_git_git;
 246         } else if (!is_directory(mkpath("%s/objects", ref_git)))
 247                 die(_("reference repository '%s' is not a local repository."),
 248                     item->string);
 249
 250         if (!access(mkpath("%s/shallow", ref_git), F_OK))
 251                 die(_("reference repository '%s' is shallow"), item->string);
 252
 253         if (!access(mkpath("%s/info/grafts", ref_git), F_OK))
 254                 die(_("reference repository '%s' is grafted"), item->string);
 255
 256         strbuf_addf(&alternate, "%s/objects", ref_git);
 257         add_to_alternates_file(alternate.buf);
 258         strbuf_release(&alternate);
 259         free(ref_git);
 260         return 0;
 261 }
 262
 263 static void setup_reference(void)
 264 {
 265         for_each_string_list(&option_reference, add_one_reference, NULL);
 266 }
 267
 268 static void copy_alternates(struct strbuf *src, struct strbuf *dst,
 269                             const char *src_repo)
 270 {
 271         /*
 272          * Read from the source objects/info/alternates file
 273          * and copy the entries to corresponding file in the
 274          * destination repository with add_to_alternates_file().
 275          * Both src and dst have "$path/objects/info/alternates".
 276          *
 277          * Instead of copying bit-for-bit from the original,
 278          * we need to append to existing one so that the already
 279          * created entry via "clone -s" is not lost, and also
 280          * to turn entries with paths relative to the original
 281          * absolute, so that they can be used in the new repository.
 282          */
 283         FILE *in = fopen(src->buf, "r");
 284         struct strbuf line = STRBUF_INIT;
 285
 286         while (strbuf_getline(&line, in, '\n') != EOF) {
 287                 char *abs_path, abs_buf[PATH_MAX];
 288                 if (!line.len || line.buf[0] == '#')
 289                         continue;
 290                 if (is_absolute_path(line.buf)) {
 291                         add_to_alternates_file(line.buf);
 292                         continue;
 293                 }
 294                 abs_path = mkpath("%s/objects/%s", src_repo, line.buf);
 295                 normalize_path_copy(abs_buf, abs_path);
 296                 add_to_alternates_file(abs_buf);
 297         }
 298         strbuf_release(&line);
 299         fclose(in);
 300 }
 301
 302 static void copy_or_link_directory(struct strbuf *src, struct strbuf *dest,
 303                                    const char *src_repo, int src_baselen)
 304 {
 305         struct dirent *de;
 306         struct stat buf;
 307         int src_len, dest_len;
 308         DIR *dir;
 309
 310         dir = opendir(src->buf);
 311         if (!dir)
 312                 die_errno(_("failed to open '%s'"), src->buf);
 313
 314         if (mkdir(dest->buf, 0777)) {
 315                 if (errno != EEXIST)
 316                         die_errno(_("failed to create directory '%s'"), dest->buf);
 317                 else if (stat(dest->buf, &buf))
 318                         die_errno(_("failed to stat '%s'"), dest->buf);
 319                 else if (!S_ISDIR(buf.st_mode))
 320                         die(_("%s exists and is not a directory"), dest->buf);
 321         }
 322
 323         strbuf_addch(src, '/');
 324         src_len = src->len;
 325         strbuf_addch(dest, '/');
 326         dest_len = dest->len;
 327
 328         while ((de = readdir(dir)) != NULL) {
 329                 strbuf_setlen(src, src_len);
 330                 strbuf_addstr(src, de->d_name);
 331                 strbuf_setlen(dest, dest_len);
 332                 strbuf_addstr(dest, de->d_name);
 333                 if (stat(src->buf, &buf)) {
 334                         warning (_("failed to stat %s\n"), src->buf);
 335                         continue;
 336                 }
 337                 if (S_ISDIR(buf.st_mode)) {
 338                         if (de->d_name[0] != '.')
 339                                 copy_or_link_directory(src, dest,
 340                                                        src_repo, src_baselen);
 341                         continue;
 342                 }
 343
 344                 /* Files that cannot be copied bit-for-bit... */
 345                 if (!strcmp(src->buf + src_baselen, "/info/alternates")) {
 346                         copy_alternates(src, dest, src_repo);
 347                         continue;
 348                 }
 349
 350                 if (unlink(dest->buf) && errno != ENOENT)
 351                         die_errno(_("failed to unlink '%s'"), dest->buf);
 352                 if (!option_no_hardlinks) {
 353                         if (!link(src->buf, dest->buf))
 354                                 continue;
 355                         if (option_local > 0)
 356                                 die_errno(_("failed to create link '%s'"), dest->buf);
 357                         option_no_hardlinks = 1;
 358                 }
 359                 if (copy_file_with_time(dest->buf, src->buf, 0666))
 360                         die_errno(_("failed to copy file to '%s'"), dest->buf);
 361         }
 362         closedir(dir);
 363 }
 364
 365 static void clone_local(const char *src_repo, const char *dest_repo)
 366 {
 367         if (option_shared) {
 368                 struct strbuf alt = STRBUF_INIT;
 369                 strbuf_addf(&alt, "%s/objects", src_repo);
 370                 add_to_alternates_file(alt.buf);
 371                 strbuf_release(&alt);
 372         } else {
 373                 struct strbuf src = STRBUF_INIT;
 374                 struct strbuf dest = STRBUF_INIT;
 375                 strbuf_addf(&src, "%s/objects", src_repo);
 376                 strbuf_addf(&dest, "%s/objects", dest_repo);
 377                 copy_or_link_directory(&src, &dest, src_repo, src.len);
 378                 strbuf_release(&src);
 379                 strbuf_release(&dest);
 380         }
 381
 382         if (0 <= option_verbosity)
 383                 fprintf(stderr, _("done.\n"));
 384 }
 385
 386 static const char *junk_work_tree;
 387 static const char *junk_git_dir;
 388 static enum {
 389         JUNK_LEAVE_NONE,
 390         JUNK_LEAVE_REPO,
 391         JUNK_LEAVE_ALL
 392 } junk_mode = JUNK_LEAVE_NONE;
 393
 394 static const char junk_leave_repo_msg[] =
 395 N_("Clone succeeded, but checkout failed.\n"
 396    "You can inspect what was checked out with 'git status'\n"
 397    "and retry the checkout with 'git checkout -f HEAD'\n");
 398
 399 static void remove_junk(void)
 400 {
 401         struct strbuf sb = STRBUF_INIT;
 402
 403         switch (junk_mode) {
 404         case JUNK_LEAVE_REPO:
 405                 warning("%s", _(junk_leave_repo_msg));
 406                 /* fall-through */
 407         case JUNK_LEAVE_ALL:
 408                 return;
 409         default:
 410                 /* proceed to removal */
 411                 break;
 412         }
 413
 414         if (junk_git_dir) {
 415                 strbuf_addstr(&sb, junk_git_dir);
 416                 remove_dir_recursively(&sb, 0);
 417                 strbuf_reset(&sb);
 418         }
 419         if (junk_work_tree) {
 420                 strbuf_addstr(&sb, junk_work_tree);
 421                 remove_dir_recursively(&sb, 0);
 422                 strbuf_reset(&sb);
 423         }
 424 }
 425
 426 static void remove_junk_on_signal(int signo)
 427 {
 428         remove_junk();
 429         sigchain_pop(signo);
 430         raise(signo);
 431 }
 432
 433 static struct ref *find_remote_branch(const struct ref *refs, const char *branch)
 434 {
 435         struct ref *ref;
 436         struct strbuf head = STRBUF_INIT;
 437         strbuf_addstr(&head, "refs/heads/");
 438         strbuf_addstr(&head, branch);
 439         ref = find_ref_by_name(refs, head.buf);
 440         strbuf_release(&head);
 441
 442         if (ref)
 443                 return ref;
 444
 445         strbuf_addstr(&head, "refs/tags/");
 446         strbuf_addstr(&head, branch);
 447         ref = find_ref_by_name(refs, head.buf);
 448         strbuf_release(&head);
 449
 450         return ref;
 451 }
 452
 453 static struct ref *wanted_peer_refs(const struct ref *refs,
 454                 struct refspec *refspec)
 455 {
 456         struct ref *head = copy_ref(find_ref_by_name(refs, "HEAD"));
 457         struct ref *local_refs = head;
 458         struct ref **tail = head ? &head->next : &local_refs;
 459
 460         if (option_single_branch) {
 461                 struct ref *remote_head = NULL;
 462
 463                 if (!option_branch)
 464                         remote_head = guess_remote_head(head, refs, 0);
 465                 else {
 466                         local_refs = NULL;
 467                         tail = &local_refs;
 468                         remote_head = copy_ref(find_remote_branch(refs, option_branch));
 469                 }
 470
 471                 if (!remote_head && option_branch)
 472                         warning(_("Could not find remote branch %s to clone."),
 473                                 option_branch);
 474                 else {
 475                         get_fetch_map(remote_head, refspec, &tail, 0);
 476
 477                         /* if --branch=tag, pull the requested tag explicitly */
 478                         get_fetch_map(remote_head, tag_refspec, &tail, 0);
 479                 }
 480         } else
 481                 get_fetch_map(refs, refspec, &tail, 0);
 482
 483         if (!option_mirror && !option_single_branch)
 484                 get_fetch_map(refs, tag_refspec, &tail, 0);
 485
 486         return local_refs;
 487 }
 488
 489 static void write_remote_refs(const struct ref *local_refs)
 490 {
 491         const struct ref *r;
 492
 493         lock_packed_refs(LOCK_DIE_ON_ERROR);
 494
 495         for (r = local_refs; r; r = r->next) {
 496                 if (!r->peer_ref)
 497                         continue;
 498                 add_packed_ref(r->peer_ref->name, r->old_sha1);
 499         }
 500
 501         if (commit_packed_refs())
 502                 die_errno("unable to overwrite old ref-pack file");
 503 }
 504
 505 static void write_followtags(const struct ref *refs, const char *msg)
 506 {
 507         const struct ref *ref;
 508         for (ref = refs; ref; ref = ref->next) {
 509                 if (!starts_with(ref->name, "refs/tags/"))
 510                         continue;
 511                 if (ends_with(ref->name, "^{}"))
 512                         continue;
 513                 if (!has_sha1_file(ref->old_sha1))
 514                         continue;
 515                 update_ref(msg, ref->name, ref->old_sha1,
 516                            NULL, 0, UPDATE_REFS_DIE_ON_ERR);
 517         }
 518 }
 519
 520 static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
 521 {
 522         struct ref **rm = cb_data;
 523         struct ref *ref = *rm;
 524
 525         /*
 526          * Skip anything missing a peer_ref, which we are not
 527          * actually going to write a ref for.
 528          */
 529         while (ref && !ref->peer_ref)
 530                 ref = ref->next;
 531         /* Returning -1 notes "end of list" to the caller. */
 532         if (!ref)
 533                 return -1;
 534
 535         hashcpy(sha1, ref->old_sha1);
 536         *rm = ref->next;
 537         return 0;
 538 }
 539
 540 static void update_remote_refs(const struct ref *refs,
 541                                const struct ref *mapped_refs,
 542                                const struct ref *remote_head_points_at,
 543                                const char *branch_top,
 544                                const char *msg,
 545                                struct transport *transport,
 546                                int check_connectivity)
 547 {
 548         const struct ref *rm = mapped_refs;
 549
 550         if (check_connectivity) {
 551                 if (transport->progress)
 552                         fprintf(stderr, _("Checking connectivity... "));
 553                 if (check_everything_connected_with_transport(iterate_ref_map,
 554                                                               0, &rm, transport))
 555                         die(_("remote did not send all necessary objects"));
 556                 if (transport->progress)
 557                         fprintf(stderr, _("done.\n"));
 558         }
 559
 560         if (refs) {
 561                 write_remote_refs(mapped_refs);
 562                 if (option_single_branch)
 563                         write_followtags(refs, msg);
 564         }
 565
 566         if (remote_head_points_at && !option_bare) {
 567                 struct strbuf head_ref = STRBUF_INIT;
 568                 strbuf_addstr(&head_ref, branch_top);
 569                 strbuf_addstr(&head_ref, "HEAD");
 570                 create_symref(head_ref.buf,
 571                               remote_head_points_at->peer_ref->name,
 572                               msg);
 573         }
 574 }
 575
 576 static void update_head(const struct ref *our, const struct ref *remote,
 577                         const char *msg)
 578 {
 579         const char *head;
 580         if (our && skip_prefix(our->name, "refs/heads/", &head)) {
 581                 /* Local default branch link */
 582                 create_symref("HEAD", our->name, NULL);
 583                 if (!option_bare) {
 584                         update_ref(msg, "HEAD", our->old_sha1, NULL, 0,
 585                                    UPDATE_REFS_DIE_ON_ERR);
 586                         install_branch_config(0, head, option_origin, our->name);
 587                 }
 588         } else if (our) {
 589                 struct commit *c = lookup_commit_reference(our->old_sha1);
 590                 /* --branch specifies a non-branch (i.e. tags), detach HEAD */
 591                 update_ref(msg, "HEAD", c->object.sha1,
 592                            NULL, REF_NODEREF, UPDATE_REFS_DIE_ON_ERR);
 593         } else if (remote) {
 594                 /*
 595                  * We know remote HEAD points to a non-branch, or
 596                  * HEAD points to a branch but we don't know which one.
 597                  * Detach HEAD in all these cases.
 598                  */
 599                 update_ref(msg, "HEAD", remote->old_sha1,
 600                            NULL, REF_NODEREF, UPDATE_REFS_DIE_ON_ERR);
 601         }
 602 }
 603
 604 static int checkout(void)
 605 {
 606         unsigned char sha1[20];
 607         char *head;
 608         struct lock_file *lock_file;
 609         struct unpack_trees_options opts;
 610         struct tree *tree;
 611         struct tree_desc t;
 612         int err = 0;
 613
 614         if (option_no_checkout)
 615                 return 0;
 616
 617         head = resolve_refdup("HEAD", RESOLVE_REF_READING, sha1, NULL);
 618         if (!head) {
 619                 warning(_("remote HEAD refers to nonexistent ref, "
 620                           "unable to checkout.\n"));
 621                 return 0;
 622         }
 623         if (!strcmp(head, "HEAD")) {
 624                 if (advice_detached_head)
 625                         detach_advice(sha1_to_hex(sha1));
 626         } else {
 627                 if (!starts_with(head, "refs/heads/"))
 628                         die(_("HEAD not found below refs/heads!"));
 629         }
 630         free(head);
 631
 632         /* We need to be in the new work tree for the checkout */
 633         setup_work_tree();
 634
 635         lock_file = xcalloc(1, sizeof(struct lock_file));
 636         hold_locked_index(lock_file, 1);
 637
 638         memset(&opts, 0, sizeof opts);
 639         opts.update = 1;
 640         opts.merge = 1;
 641         opts.fn = oneway_merge;
 642         opts.verbose_update = (option_verbosity >= 0);
 643         opts.src_index = &the_index;
 644         opts.dst_index = &the_index;
 645
 646         tree = parse_tree_indirect(sha1);
 647         parse_tree(tree);
 648         init_tree_desc(&t, tree->buffer, tree->size);
 649         if (unpack_trees(1, &t, &opts) < 0)
 650                 die(_("unable to checkout working tree"));
 651
 652         if (write_locked_index(&the_index, lock_file, COMMIT_LOCK))
 653                 die(_("unable to write new index file"));
 654
 655         err |= run_hook_le(NULL, "post-checkout", sha1_to_hex(null_sha1),
 656                            sha1_to_hex(sha1), "1", NULL);
 657
 658         if (!err && option_recursive)
 659                 err = run_command_v_opt(argv_submodule, RUN_GIT_CMD);
 660
 661         return err;
 662 }
 663
 664 static int write_one_config(const char *key, const char *value, void *data)
 665 {
 666         return git_config_set_multivar(key, value ? value : "true", "^$", 0);
 667 }
 668
 669 static void write_config(struct string_list *config)
 670 {
 671         int i;
 672
 673         for (i = 0; i < config->nr; i++) {
 674                 if (git_config_parse_parameter(config->items[i].string,
 675                                                write_one_config, NULL) < 0)
 676                         die("unable to write parameters to config file");
 677         }
 678 }
 679
 680 static void write_refspec_config(const char *src_ref_prefix,
 681                 const struct ref *our_head_points_at,
 682                 const struct ref *remote_head_points_at,
 683                 struct strbuf *branch_top)
 684 {
 685         struct strbuf key = STRBUF_INIT;
 686         struct strbuf value = STRBUF_INIT;
 687
 688         if (option_mirror || !option_bare) {
 689                 if (option_single_branch && !option_mirror) {
 690                         if (option_branch) {
 691                                 if (starts_with(our_head_points_at->name, "refs/tags/"))
 692                                         strbuf_addf(&value, "+%s:%s", our_head_points_at->name,
 693                                                 our_head_points_at->name);
 694                                 else
 695                                         strbuf_addf(&value, "+%s:%s%s", our_head_points_at->name,
 696                                                 branch_top->buf, option_branch);
 697                         } else if (remote_head_points_at) {
 698                                 const char *head = remote_head_points_at->name;
 699                                 if (!skip_prefix(head, "refs/heads/", &head))
 700                                         die("BUG: remote HEAD points at non-head?");
 701
 702                                 strbuf_addf(&value, "+%s:%s%s", remote_head_points_at->name,
 703                                                 branch_top->buf, head);
 704                         }
 705                         /*
 706                          * otherwise, the next "git fetch" will
 707                          * simply fetch from HEAD without updating
 708                          * any remote-tracking branch, which is what
 709                          * we want.
 710                          */
 711                 } else {
 712                         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top->buf);
 713                 }
 714                 /* Configure the remote */
 715                 if (value.len) {
 716                         strbuf_addf(&key, "remote.%s.fetch", option_origin);
 717                         git_config_set_multivar(key.buf, value.buf, "^$", 0);
 718                         strbuf_reset(&key);
 719
 720                         if (option_mirror) {
 721                                 strbuf_addf(&key, "remote.%s.mirror", option_origin);
 722                                 git_config_set(key.buf, "true");
 723                                 strbuf_reset(&key);
 724                         }
 725                 }
 726         }
 727
 728         strbuf_release(&key);
 729         strbuf_release(&value);
 730 }
 731
 732 static void dissociate_from_references(void)
 733 {
 734         static const char* argv[] = { "repack", "-a", "-d", NULL };
 735
 736         if (run_command_v_opt(argv, RUN_GIT_CMD|RUN_COMMAND_NO_STDIN))
 737                 die(_("cannot repack to clean up"));
 738         if (unlink(git_path("objects/info/alternates")) && errno != ENOENT)
 739                 die_errno(_("cannot unlink temporary alternates file"));
 740 }
 741
 742 int cmd_clone(int argc, const char **argv, const char *prefix)
 743 {
 744         int is_bundle = 0, is_local;
 745         struct stat buf;
 746         const char *repo_name, *repo, *work_tree, *git_dir;
 747         char *path, *dir;
 748         int dest_exists;
 749         const struct ref *refs, *remote_head;
 750         const struct ref *remote_head_points_at;
 751         const struct ref *our_head_points_at;
 752         struct ref *mapped_refs;
 753         const struct ref *ref;
 754         struct strbuf key = STRBUF_INIT, value = STRBUF_INIT;
 755         struct strbuf branch_top = STRBUF_INIT, reflog_msg = STRBUF_INIT;
 756         struct transport *transport = NULL;
 757         const char *src_ref_prefix = "refs/heads/";
 758         struct remote *remote;
 759         int err = 0, complete_refs_before_fetch = 1;
 760
 761         struct refspec *refspec;
 762         const char *fetch_pattern;
 763
 764         packet_trace_identity("clone");
 765         argc = parse_options(argc, argv, prefix, builtin_clone_options,
 766                              builtin_clone_usage, 0);
 767
 768         if (argc > 2)
 769                 usage_msg_opt(_("Too many arguments."),
 770                         builtin_clone_usage, builtin_clone_options);
 771
 772         if (argc == 0)
 773                 usage_msg_opt(_("You must specify a repository to clone."),
 774                         builtin_clone_usage, builtin_clone_options);
 775
 776         if (option_single_branch == -1)
 777                 option_single_branch = option_depth ? 1 : 0;
 778
 779         if (option_mirror)
 780                 option_bare = 1;
 781
 782         if (option_bare) {
 783                 if (option_origin)
 784                         die(_("--bare and --origin %s options are incompatible."),
 785                             option_origin);
 786                 if (real_git_dir)
 787                         die(_("--bare and --separate-git-dir are incompatible."));
 788                 option_no_checkout = 1;
 789         }
 790
 791         if (!option_origin)
 792                 option_origin = "origin";
 793
 794         repo_name = argv[0];
 795
 796         path = get_repo_path(repo_name, &is_bundle);
 797         if (path)
 798                 repo = xstrdup(absolute_path(repo_name));
 799         else if (!strchr(repo_name, ':'))
 800                 die(_("repository '%s' does not exist"), repo_name);
 801         else
 802                 repo = repo_name;
 803
 804         /* no need to be strict, transport_set_option() will validate it again */
 805         if (option_depth && atoi(option_depth) < 1)
 806                 die(_("depth %s is not a positive number"), option_depth);
 807
 808         if (argc == 2)
 809                 dir = xstrdup(argv[1]);
 810         else
 811                 dir = guess_dir_name(repo_name, is_bundle, option_bare);
 812         strip_trailing_slashes(dir);
 813
 814         dest_exists = !stat(dir, &buf);
 815         if (dest_exists && !is_empty_dir(dir))
 816                 die(_("destination path '%s' already exists and is not "
 817                         "an empty directory."), dir);
 818
 819         strbuf_addf(&reflog_msg, "clone: from %s", repo);
 820
 821         if (option_bare)
 822                 work_tree = NULL;
 823         else {
 824                 work_tree = getenv("GIT_WORK_TREE");
 825                 if (work_tree && !stat(work_tree, &buf))
 826                         die(_("working tree '%s' already exists."), work_tree);
 827         }
 828
 829         if (option_bare || work_tree)
 830                 git_dir = xstrdup(dir);
 831         else {
 832                 work_tree = dir;
 833                 git_dir = mkpathdup("%s/.git", dir);
 834         }
 835
 836         atexit(remove_junk);
 837         sigchain_push_common(remove_junk_on_signal);
 838
 839         if (!option_bare) {
 840                 if (safe_create_leading_directories_const(work_tree) < 0)
 841                         die_errno(_("could not create leading directories of '%s'"),
 842                                   work_tree);
 843                 if (!dest_exists && mkdir(work_tree, 0777))
 844                         die_errno(_("could not create work tree dir '%s'"),
 845                                   work_tree);
 846                 junk_work_tree = work_tree;
 847                 set_git_work_tree(work_tree);
 848         }
 849
 850         junk_git_dir = git_dir;
 851         if (safe_create_leading_directories_const(git_dir) < 0)
 852                 die(_("could not create leading directories of '%s'"), git_dir);
 853
 854         set_git_dir_init(git_dir, real_git_dir, 0);
 855         if (real_git_dir) {
 856                 git_dir = real_git_dir;
 857                 junk_git_dir = real_git_dir;
 858         }
 859
 860         if (0 <= option_verbosity) {
 861                 if (option_bare)
 862                         fprintf(stderr, _("Cloning into bare repository '%s'...\n"), dir);
 863                 else
 864                         fprintf(stderr, _("Cloning into '%s'...\n"), dir);
 865         }
 866         init_db(option_template, INIT_DB_QUIET);
 867         write_config(&option_config);
 868
 869         git_config(git_default_config, NULL);
 870
 871         if (option_bare) {
 872                 if (option_mirror)
 873                         src_ref_prefix = "refs/";
 874                 strbuf_addstr(&branch_top, src_ref_prefix);
 875
 876                 git_config_set("core.bare", "true");
 877         } else {
 878                 strbuf_addf(&branch_top, "refs/remotes/%s/", option_origin);
 879         }
 880
 881         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top.buf);
 882         strbuf_addf(&key, "remote.%s.url", option_origin);
 883         git_config_set(key.buf, repo);
 884         strbuf_reset(&key);
 885
 886         if (option_reference.nr)
 887                 setup_reference();
 888         else if (option_dissociate) {
 889                 warning(_("--dissociate given, but there is no --reference"));
 890                 option_dissociate = 0;
 891         }
 892
 893         fetch_pattern = value.buf;
 894         refspec = parse_fetch_refspec(1, &fetch_pattern);
 895
 896         strbuf_reset(&value);
 897
 898         remote = remote_get(option_origin);
 899         transport = transport_get(remote, remote->url[0]);
 900         transport_set_verbosity(transport, option_verbosity, option_progress);
 901
 902         path = get_repo_path(remote->url[0], &is_bundle);
 903         is_local = option_local != 0 && path && !is_bundle;
 904         if (is_local) {
 905                 if (option_depth)
 906                         warning(_("--depth is ignored in local clones; use file:// instead."));
 907                 if (!access(mkpath("%s/shallow", path), F_OK)) {
 908                         if (option_local > 0)
 909                                 warning(_("source repository is shallow, ignoring --local"));
 910                         is_local = 0;
 911                 }
 912         }
 913         if (option_local > 0 && !is_local)
 914                 warning(_("--local is ignored"));
 915         transport->cloning = 1;
 916
 917         if (!transport->get_refs_list || (!is_local && !transport->fetch))
 918                 die(_("Don't know how to clone %s"), transport->url);
 919
 920         transport_set_option(transport, TRANS_OPT_KEEP, "yes");
 921
 922         if (option_depth)
 923                 transport_set_option(transport, TRANS_OPT_DEPTH,
 924                                      option_depth);
 925         if (option_single_branch)
 926                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
 927
 928         if (option_upload_pack)
 929                 transport_set_option(transport, TRANS_OPT_UPLOADPACK,
 930                                      option_upload_pack);
 931
 932         if (transport->smart_options && !option_depth)
 933                 transport->smart_options->check_self_contained_and_connected = 1;
 934
 935         refs = transport_get_remote_refs(transport);
 936
 937         if (refs) {
 938                 mapped_refs = wanted_peer_refs(refs, refspec);
 939                 /*
 940                  * transport_get_remote_refs() may return refs with null sha-1
 941                  * in mapped_refs (see struct transport->get_refs_list
 942                  * comment). In that case we need fetch it early because
 943                  * remote_head code below relies on it.
 944                  *
 945                  * for normal clones, transport_get_remote_refs() should
 946                  * return reliable ref set, we can delay cloning until after
 947                  * remote HEAD check.
 948                  */
 949                 for (ref = refs; ref; ref = ref->next)
 950                         if (is_null_sha1(ref->old_sha1)) {
 951                                 complete_refs_before_fetch = 0;
 952                                 break;
 953                         }
 954
 955                 if (!is_local && !complete_refs_before_fetch)
 956                         transport_fetch_refs(transport, mapped_refs);
 957
 958                 remote_head = find_ref_by_name(refs, "HEAD");
 959                 remote_head_points_at =
 960                         guess_remote_head(remote_head, mapped_refs, 0);
 961
 962                 if (option_branch) {
 963                         our_head_points_at =
 964                                 find_remote_branch(mapped_refs, option_branch);
 965
 966                         if (!our_head_points_at)
 967                                 die(_("Remote branch %s not found in upstream %s"),
 968                                     option_branch, option_origin);
 969                 }
 970                 else
 971                         our_head_points_at = remote_head_points_at;
 972         }
 973         else {
 974                 if (option_branch)
 975                         die(_("Remote branch %s not found in upstream %s"),
 976                                         option_branch, option_origin);
 977
 978                 warning(_("You appear to have cloned an empty repository."));
 979                 mapped_refs = NULL;
 980                 our_head_points_at = NULL;
 981                 remote_head_points_at = NULL;
 982                 remote_head = NULL;
 983                 option_no_checkout = 1;
 984                 if (!option_bare)
 985                         install_branch_config(0, "master", option_origin,
 986                                               "refs/heads/master");
 987         }
 988
 989         write_refspec_config(src_ref_prefix, our_head_points_at,
 990                         remote_head_points_at, &branch_top);
 991
 992         if (is_local)
 993                 clone_local(path, git_dir);
 994         else if (refs && complete_refs_before_fetch)
 995                 transport_fetch_refs(transport, mapped_refs);
 996
 997         update_remote_refs(refs, mapped_refs, remote_head_points_at,
 998                            branch_top.buf, reflog_msg.buf, transport, !is_local);
 999
1000         update_head(our_head_points_at, remote_head, reflog_msg.buf);
1001
1002         transport_unlock_pack(transport);
1003         transport_disconnect(transport);
1004
1005         if (option_dissociate)
1006                 dissociate_from_references();
1007
1008         junk_mode = JUNK_LEAVE_REPO;
1009         err = checkout();
1010
1011         strbuf_release(&reflog_msg);
1012         strbuf_release(&branch_top);
1013         strbuf_release(&key);
1014         strbuf_release(&value);
1015         junk_mode = JUNK_LEAVE_ALL;
1016
1017         free(refspec);
1018         return err;
1019 }