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 "parse-options.h"
  13 #include "fetch-pack.h"
  14 #include "refs.h"
  15 #include "tree.h"
  16 #include "tree-walk.h"
  17 #include "unpack-trees.h"
  18 #include "transport.h"
  19 #include "strbuf.h"
  20 #include "dir.h"
  21 #include "sigchain.h"
  22 #include "branch.h"
  23 #include "remote.h"
  24 #include "run-command.h"
  25 #include "connected.h"
  26
  27 /*
  28  * Overall FIXMEs:
  29  *  - respect DB_ENVIRONMENT for .git/objects.
  30  *
  31  * Implementation notes:
  32  *  - dropping use-separate-remote and no-separate-remote compatibility
  33  *
  34  */
  35 static const char * const builtin_clone_usage[] = {
  36         N_("git clone [options] [--] <repo> [<dir>]"),
  37         NULL
  38 };
  39
  40 static int option_no_checkout, option_bare, option_mirror, option_single_branch = -1;
  41 static int option_local = -1, option_no_hardlinks, option_shared, option_recursive;
  42 static char *option_template, *option_depth;
  43 static char *option_origin = NULL;
  44 static char *option_branch = NULL;
  45 static const char *real_git_dir;
  46 static char *option_upload_pack = "git-upload-pack";
  47 static int option_verbosity;
  48 static int option_progress = -1;
  49 static struct string_list option_config;
  50 static struct string_list option_reference;
  51
  52 static int opt_parse_reference(const struct option *opt, const char *arg, int unset)
  53 {
  54         struct string_list *option_reference = opt->value;
  55         if (!arg)
  56                 return -1;
  57         string_list_append(option_reference, arg);
  58         return 0;
  59 }
  60
  61 static struct option builtin_clone_options[] = {
  62         OPT__VERBOSITY(&option_verbosity),
  63         OPT_BOOL(0, "progress", &option_progress,
  64                  N_("force progress reporting")),
  65         OPT_BOOLEAN('n', "no-checkout", &option_no_checkout,
  66                     N_("don't create a checkout")),
  67         OPT_BOOLEAN(0, "bare", &option_bare, N_("create a bare repository")),
  68         { OPTION_BOOLEAN, 0, "naked", &option_bare, NULL,
  69                 N_("create a bare repository"),
  70                 PARSE_OPT_NOARG | PARSE_OPT_HIDDEN },
  71         OPT_BOOLEAN(0, "mirror", &option_mirror,
  72                     N_("create a mirror repository (implies bare)")),
  73         OPT_BOOL('l', "local", &option_local,
  74                 N_("to clone from a local repository")),
  75         OPT_BOOLEAN(0, "no-hardlinks", &option_no_hardlinks,
  76                     N_("don't use local hardlinks, always copy")),
  77         OPT_BOOLEAN('s', "shared", &option_shared,
  78                     N_("setup as shared repository")),
  79         OPT_BOOLEAN(0, "recursive", &option_recursive,
  80                     N_("initialize submodules in the clone")),
  81         OPT_BOOLEAN(0, "recurse-submodules", &option_recursive,
  82                     N_("initialize submodules in the clone")),
  83         OPT_STRING(0, "template", &option_template, N_("template-directory"),
  84                    N_("directory from which templates will be used")),
  85         OPT_CALLBACK(0 , "reference", &option_reference, N_("repo"),
  86                      N_("reference repository"), &opt_parse_reference),
  87         OPT_STRING('o', "origin", &option_origin, N_("name"),
  88                    N_("use <name> instead of 'origin' to track upstream")),
  89         OPT_STRING('b', "branch", &option_branch, N_("branch"),
  90                    N_("checkout <branch> instead of the remote's HEAD")),
  91         OPT_STRING('u', "upload-pack", &option_upload_pack, N_("path"),
  92                    N_("path to git-upload-pack on the remote")),
  93         OPT_STRING(0, "depth", &option_depth, N_("depth"),
  94                     N_("create a shallow clone of that depth")),
  95         OPT_BOOL(0, "single-branch", &option_single_branch,
  96                     N_("clone only one branch, HEAD or --branch")),
  97         OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
  98                    N_("separate git dir from working tree")),
  99         OPT_STRING_LIST('c', "config", &option_config, N_("key=value"),
 100                         N_("set config inside the new repository")),
 101         OPT_END()
 102 };
 103
 104 static const char *argv_submodule[] = {
 105         "submodule", "update", "--init", "--recursive", NULL
 106 };
 107
 108 static char *get_repo_path(const char *repo, int *is_bundle)
 109 {
 110         static char *suffix[] = { "/.git", "", ".git/.git", ".git" };
 111         static char *bundle_suffix[] = { ".bundle", "" };
 112         struct stat st;
 113         int i;
 114
 115         for (i = 0; i < ARRAY_SIZE(suffix); i++) {
 116                 const char *path;
 117                 path = mkpath("%s%s", repo, suffix[i]);
 118                 if (stat(path, &st))
 119                         continue;
 120                 if (S_ISDIR(st.st_mode) && is_git_directory(path)) {
 121                         *is_bundle = 0;
 122                         return xstrdup(absolute_path(path));
 123                 } else if (S_ISREG(st.st_mode) && st.st_size > 8) {
 124                         /* Is it a "gitfile"? */
 125                         char signature[8];
 126                         int len, fd = open(path, O_RDONLY);
 127                         if (fd < 0)
 128                                 continue;
 129                         len = read_in_full(fd, signature, 8);
 130                         close(fd);
 131                         if (len != 8 || strncmp(signature, "gitdir: ", 8))
 132                                 continue;
 133                         path = read_gitfile(path);
 134                         if (path) {
 135                                 *is_bundle = 0;
 136                                 return xstrdup(absolute_path(path));
 137                         }
 138                 }
 139         }
 140
 141         for (i = 0; i < ARRAY_SIZE(bundle_suffix); i++) {
 142                 const char *path;
 143                 path = mkpath("%s%s", repo, bundle_suffix[i]);
 144                 if (!stat(path, &st) && S_ISREG(st.st_mode)) {
 145                         *is_bundle = 1;
 146                         return xstrdup(absolute_path(path));
 147                 }
 148         }
 149
 150         return NULL;
 151 }
 152
 153 static char *guess_dir_name(const char *repo, int is_bundle, int is_bare)
 154 {
 155         const char *end = repo + strlen(repo), *start;
 156         char *dir;
 157
 158         /*
 159          * Strip trailing spaces, slashes and /.git
 160          */
 161         while (repo < end && (is_dir_sep(end[-1]) || isspace(end[-1])))
 162                 end--;
 163         if (end - repo > 5 && is_dir_sep(end[-5]) &&
 164             !strncmp(end - 4, ".git", 4)) {
 165                 end -= 5;
 166                 while (repo < end && is_dir_sep(end[-1]))
 167                         end--;
 168         }
 169
 170         /*
 171          * Find last component, but be prepared that repo could have
 172          * the form  "remote.example.com:foo.git", i.e. no slash
 173          * in the directory part.
 174          */
 175         start = end;
 176         while (repo < start && !is_dir_sep(start[-1]) && start[-1] != ':')
 177                 start--;
 178
 179         /*
 180          * Strip .{bundle,git}.
 181          */
 182         if (is_bundle) {
 183                 if (end - start > 7 && !strncmp(end - 7, ".bundle", 7))
 184                         end -= 7;
 185         } else {
 186                 if (end - start > 4 && !strncmp(end - 4, ".git", 4))
 187                         end -= 4;
 188         }
 189
 190         if (is_bare) {
 191                 struct strbuf result = STRBUF_INIT;
 192                 strbuf_addf(&result, "%.*s.git", (int)(end - start), start);
 193                 dir = strbuf_detach(&result, NULL);
 194         } else
 195                 dir = xstrndup(start, end - start);
 196         /*
 197          * Replace sequences of 'control' characters and whitespace
 198          * with one ascii space, remove leading and trailing spaces.
 199          */
 200         if (*dir) {
 201                 char *out = dir;
 202                 int prev_space = 1 /* strip leading whitespace */;
 203                 for (end = dir; *end; ++end) {
 204                         char ch = *end;
 205                         if ((unsigned char)ch < '\x20')
 206                                 ch = '\x20';
 207                         if (isspace(ch)) {
 208                                 if (prev_space)
 209                                         continue;
 210                                 prev_space = 1;
 211                         } else
 212                                 prev_space = 0;
 213                         *out++ = ch;
 214                 }
 215                 *out = '\0';
 216                 if (out > dir && prev_space)
 217                         out[-1] = '\0';
 218         }
 219         return dir;
 220 }
 221
 222 static void strip_trailing_slashes(char *dir)
 223 {
 224         char *end = dir + strlen(dir);
 225
 226         while (dir < end - 1 && is_dir_sep(end[-1]))
 227                 end--;
 228         *end = '\0';
 229 }
 230
 231 static int add_one_reference(struct string_list_item *item, void *cb_data)
 232 {
 233         char *ref_git;
 234         const char *repo;
 235         struct strbuf alternate = STRBUF_INIT;
 236
 237         /* Beware: read_gitfile(), real_path() and mkpath() return static buffer */
 238         ref_git = xstrdup(real_path(item->string));
 239
 240         repo = read_gitfile(ref_git);
 241         if (!repo)
 242                 repo = read_gitfile(mkpath("%s/.git", ref_git));
 243         if (repo) {
 244                 free(ref_git);
 245                 ref_git = xstrdup(repo);
 246         }
 247
 248         if (!repo && is_directory(mkpath("%s/.git/objects", ref_git))) {
 249                 char *ref_git_git = mkpathdup("%s/.git", ref_git);
 250                 free(ref_git);
 251                 ref_git = ref_git_git;
 252         } else if (!is_directory(mkpath("%s/objects", ref_git)))
 253                 die(_("reference repository '%s' is not a local repository."),
 254                     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                 printf(_("done.\n"));
 384 }
 385
 386 static const char *junk_work_tree;
 387 static const char *junk_git_dir;
 388 static pid_t junk_pid;
 389 static enum {
 390         JUNK_LEAVE_NONE,
 391         JUNK_LEAVE_REPO,
 392         JUNK_LEAVE_ALL
 393 } junk_mode = JUNK_LEAVE_NONE;
 394
 395 static const char junk_leave_repo_msg[] =
 396 N_("Clone succeeded, but checkout failed.\n"
 397    "You can inspect what was checked out with 'git status'\n"
 398    "and retry the checkout with 'git checkout -f HEAD'\n");
 399
 400 static void remove_junk(void)
 401 {
 402         struct strbuf sb = STRBUF_INIT;
 403
 404         switch (junk_mode) {
 405         case JUNK_LEAVE_REPO:
 406                 warning("%s", _(junk_leave_repo_msg));
 407                 /* fall-through */
 408         case JUNK_LEAVE_ALL:
 409                 return;
 410         default:
 411                 /* proceed to removal */
 412                 break;
 413         }
 414
 415         if (getpid() != junk_pid)
 416                 return;
 417         if (junk_git_dir) {
 418                 strbuf_addstr(&sb, junk_git_dir);
 419                 remove_dir_recursively(&sb, 0);
 420                 strbuf_reset(&sb);
 421         }
 422         if (junk_work_tree) {
 423                 strbuf_addstr(&sb, junk_work_tree);
 424                 remove_dir_recursively(&sb, 0);
 425                 strbuf_reset(&sb);
 426         }
 427 }
 428
 429 static void remove_junk_on_signal(int signo)
 430 {
 431         remove_junk();
 432         sigchain_pop(signo);
 433         raise(signo);
 434 }
 435
 436 static struct ref *find_remote_branch(const struct ref *refs, const char *branch)
 437 {
 438         struct ref *ref;
 439         struct strbuf head = STRBUF_INIT;
 440         strbuf_addstr(&head, "refs/heads/");
 441         strbuf_addstr(&head, branch);
 442         ref = find_ref_by_name(refs, head.buf);
 443         strbuf_release(&head);
 444
 445         if (ref)
 446                 return ref;
 447
 448         strbuf_addstr(&head, "refs/tags/");
 449         strbuf_addstr(&head, branch);
 450         ref = find_ref_by_name(refs, head.buf);
 451         strbuf_release(&head);
 452
 453         return ref;
 454 }
 455
 456 static struct ref *wanted_peer_refs(const struct ref *refs,
 457                 struct refspec *refspec)
 458 {
 459         struct ref *head = copy_ref(find_ref_by_name(refs, "HEAD"));
 460         struct ref *local_refs = head;
 461         struct ref **tail = head ? &head->next : &local_refs;
 462
 463         if (option_single_branch) {
 464                 struct ref *remote_head = NULL;
 465
 466                 if (!option_branch)
 467                         remote_head = guess_remote_head(head, refs, 0);
 468                 else {
 469                         local_refs = NULL;
 470                         tail = &local_refs;
 471                         remote_head = copy_ref(find_remote_branch(refs, option_branch));
 472                 }
 473
 474                 if (!remote_head && option_branch)
 475                         warning(_("Could not find remote branch %s to clone."),
 476                                 option_branch);
 477                 else {
 478                         get_fetch_map(remote_head, refspec, &tail, 0);
 479
 480                         /* if --branch=tag, pull the requested tag explicitly */
 481                         get_fetch_map(remote_head, tag_refspec, &tail, 0);
 482                 }
 483         } else
 484                 get_fetch_map(refs, refspec, &tail, 0);
 485
 486         if (!option_mirror && !option_single_branch)
 487                 get_fetch_map(refs, tag_refspec, &tail, 0);
 488
 489         return local_refs;
 490 }
 491
 492 static void write_remote_refs(const struct ref *local_refs)
 493 {
 494         const struct ref *r;
 495
 496         lock_packed_refs(LOCK_DIE_ON_ERROR);
 497
 498         for (r = local_refs; r; r = r->next) {
 499                 if (!r->peer_ref)
 500                         continue;
 501                 add_packed_ref(r->peer_ref->name, r->old_sha1);
 502         }
 503
 504         if (commit_packed_refs())
 505                 die_errno("unable to overwrite old ref-pack file");
 506 }
 507
 508 static void write_followtags(const struct ref *refs, const char *msg)
 509 {
 510         const struct ref *ref;
 511         for (ref = refs; ref; ref = ref->next) {
 512                 if (prefixcmp(ref->name, "refs/tags/"))
 513                         continue;
 514                 if (!suffixcmp(ref->name, "^{}"))
 515                         continue;
 516                 if (!has_sha1_file(ref->old_sha1))
 517                         continue;
 518                 update_ref(msg, ref->name, ref->old_sha1,
 519                            NULL, 0, DIE_ON_ERR);
 520         }
 521 }
 522
 523 static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
 524 {
 525         struct ref **rm = cb_data;
 526         struct ref *ref = *rm;
 527
 528         /*
 529          * Skip anything missing a peer_ref, which we are not
 530          * actually going to write a ref for.
 531          */
 532         while (ref && !ref->peer_ref)
 533                 ref = ref->next;
 534         /* Returning -1 notes "end of list" to the caller. */
 535         if (!ref)
 536                 return -1;
 537
 538         hashcpy(sha1, ref->old_sha1);
 539         *rm = ref->next;
 540         return 0;
 541 }
 542
 543 static void update_remote_refs(const struct ref *refs,
 544                                const struct ref *mapped_refs,
 545                                const struct ref *remote_head_points_at,
 546                                const char *branch_top,
 547                                const char *msg,
 548                                struct transport *transport,
 549                                int check_connectivity)
 550 {
 551         const struct ref *rm = mapped_refs;
 552
 553         if (check_connectivity) {
 554                 if (0 <= option_verbosity)
 555                         printf(_("Checking connectivity... "));
 556                 if (check_everything_connected_with_transport(iterate_ref_map,
 557                                                               0, &rm, transport))
 558                         die(_("remote did not send all necessary objects"));
 559                 if (0 <= option_verbosity)
 560                         printf(_("done\n"));
 561         }
 562
 563         if (refs) {
 564                 write_remote_refs(mapped_refs);
 565                 if (option_single_branch)
 566                         write_followtags(refs, msg);
 567         }
 568
 569         if (remote_head_points_at && !option_bare) {
 570                 struct strbuf head_ref = STRBUF_INIT;
 571                 strbuf_addstr(&head_ref, branch_top);
 572                 strbuf_addstr(&head_ref, "HEAD");
 573                 create_symref(head_ref.buf,
 574                               remote_head_points_at->peer_ref->name,
 575                               msg);
 576         }
 577 }
 578
 579 static void update_head(const struct ref *our, const struct ref *remote,
 580                         const char *msg)
 581 {
 582         if (our && !prefixcmp(our->name, "refs/heads/")) {
 583                 /* Local default branch link */
 584                 create_symref("HEAD", our->name, NULL);
 585                 if (!option_bare) {
 586                         const char *head = skip_prefix(our->name, "refs/heads/");
 587                         update_ref(msg, "HEAD", our->old_sha1, NULL, 0, DIE_ON_ERR);
 588                         install_branch_config(0, head, option_origin, our->name);
 589                 }
 590         } else if (our) {
 591                 struct commit *c = lookup_commit_reference(our->old_sha1);
 592                 /* --branch specifies a non-branch (i.e. tags), detach HEAD */
 593                 update_ref(msg, "HEAD", c->object.sha1,
 594                            NULL, REF_NODEREF, DIE_ON_ERR);
 595         } else if (remote) {
 596                 /*
 597                  * We know remote HEAD points to a non-branch, or
 598                  * HEAD points to a branch but we don't know which one.
 599                  * Detach HEAD in all these cases.
 600                  */
 601                 update_ref(msg, "HEAD", remote->old_sha1,
 602                            NULL, REF_NODEREF, DIE_ON_ERR);
 603         }
 604 }
 605
 606 static int checkout(void)
 607 {
 608         unsigned char sha1[20];
 609         char *head;
 610         struct lock_file *lock_file;
 611         struct unpack_trees_options opts;
 612         struct tree *tree;
 613         struct tree_desc t;
 614         int err = 0, fd;
 615
 616         if (option_no_checkout)
 617                 return 0;
 618
 619         head = resolve_refdup("HEAD", sha1, 1, NULL);
 620         if (!head) {
 621                 warning(_("remote HEAD refers to nonexistent ref, "
 622                           "unable to checkout.\n"));
 623                 return 0;
 624         }
 625         if (!strcmp(head, "HEAD")) {
 626                 if (advice_detached_head)
 627                         detach_advice(sha1_to_hex(sha1));
 628         } else {
 629                 if (prefixcmp(head, "refs/heads/"))
 630                         die(_("HEAD not found below refs/heads!"));
 631         }
 632         free(head);
 633
 634         /* We need to be in the new work tree for the checkout */
 635         setup_work_tree();
 636
 637         lock_file = xcalloc(1, sizeof(struct lock_file));
 638         fd = hold_locked_index(lock_file, 1);
 639
 640         memset(&opts, 0, sizeof opts);
 641         opts.update = 1;
 642         opts.merge = 1;
 643         opts.fn = oneway_merge;
 644         opts.verbose_update = (option_verbosity >= 0);
 645         opts.src_index = &the_index;
 646         opts.dst_index = &the_index;
 647
 648         tree = parse_tree_indirect(sha1);
 649         parse_tree(tree);
 650         init_tree_desc(&t, tree->buffer, tree->size);
 651         if (unpack_trees(1, &t, &opts) < 0)
 652                 die(_("unable to checkout working tree"));
 653
 654         if (write_cache(fd, active_cache, active_nr) ||
 655             commit_locked_index(lock_file))
 656                 die(_("unable to write new index file"));
 657
 658         err |= run_hook(NULL, "post-checkout", sha1_to_hex(null_sha1),
 659                         sha1_to_hex(sha1), "1", NULL);
 660
 661         if (!err && option_recursive)
 662                 err = run_command_v_opt(argv_submodule, RUN_GIT_CMD);
 663
 664         return err;
 665 }
 666
 667 static int write_one_config(const char *key, const char *value, void *data)
 668 {
 669         return git_config_set_multivar(key, value ? value : "true", "^$", 0);
 670 }
 671
 672 static void write_config(struct string_list *config)
 673 {
 674         int i;
 675
 676         for (i = 0; i < config->nr; i++) {
 677                 if (git_config_parse_parameter(config->items[i].string,
 678                                                write_one_config, NULL) < 0)
 679                         die("unable to write parameters to config file");
 680         }
 681 }
 682
 683 static void write_refspec_config(const char* src_ref_prefix,
 684                 const struct ref* our_head_points_at,
 685                 const struct ref* remote_head_points_at, struct strbuf* branch_top)
 686 {
 687         struct strbuf key = STRBUF_INIT;
 688         struct strbuf value = STRBUF_INIT;
 689
 690         if (option_mirror || !option_bare) {
 691                 if (option_single_branch && !option_mirror) {
 692                         if (option_branch) {
 693                                 if (strstr(our_head_points_at->name, "refs/tags/"))
 694                                         strbuf_addf(&value, "+%s:%s", our_head_points_at->name,
 695                                                 our_head_points_at->name);
 696                                 else
 697                                         strbuf_addf(&value, "+%s:%s%s", our_head_points_at->name,
 698                                                 branch_top->buf, option_branch);
 699                         } else if (remote_head_points_at) {
 700                                 strbuf_addf(&value, "+%s:%s%s", remote_head_points_at->name,
 701                                                 branch_top->buf,
 702                                                 skip_prefix(remote_head_points_at->name, "refs/heads/"));
 703                         }
 704                         /*
 705                          * otherwise, the next "git fetch" will
 706                          * simply fetch from HEAD without updating
 707                          * any remote-tracking branch, which is what
 708                          * we want.
 709                          */
 710                 } else {
 711                         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top->buf);
 712                 }
 713                 /* Configure the remote */
 714                 if (value.len) {
 715                         strbuf_addf(&key, "remote.%s.fetch", option_origin);
 716                         git_config_set_multivar(key.buf, value.buf, "^$", 0);
 717                         strbuf_reset(&key);
 718
 719                         if (option_mirror) {
 720                                 strbuf_addf(&key, "remote.%s.mirror", option_origin);
 721                                 git_config_set(key.buf, "true");
 722                                 strbuf_reset(&key);
 723                         }
 724                 }
 725         }
 726
 727         strbuf_release(&key);
 728         strbuf_release(&value);
 729 }
 730
 731 int cmd_clone(int argc, const char **argv, const char *prefix)
 732 {
 733         int is_bundle = 0, is_local;
 734         struct stat buf;
 735         const char *repo_name, *repo, *work_tree, *git_dir;
 736         char *path, *dir;
 737         int dest_exists;
 738         const struct ref *refs, *remote_head;
 739         const struct ref *remote_head_points_at;
 740         const struct ref *our_head_points_at;
 741         struct ref *mapped_refs;
 742         const struct ref *ref;
 743         struct strbuf key = STRBUF_INIT, value = STRBUF_INIT;
 744         struct strbuf branch_top = STRBUF_INIT, reflog_msg = STRBUF_INIT;
 745         struct transport *transport = NULL;
 746         const char *src_ref_prefix = "refs/heads/";
 747         struct remote *remote;
 748         int err = 0, complete_refs_before_fetch = 1;
 749
 750         struct refspec *refspec;
 751         const char *fetch_pattern;
 752
 753         junk_pid = getpid();
 754
 755         packet_trace_identity("clone");
 756         argc = parse_options(argc, argv, prefix, builtin_clone_options,
 757                              builtin_clone_usage, 0);
 758
 759         if (argc > 2)
 760                 usage_msg_opt(_("Too many arguments."),
 761                         builtin_clone_usage, builtin_clone_options);
 762
 763         if (argc == 0)
 764                 usage_msg_opt(_("You must specify a repository to clone."),
 765                         builtin_clone_usage, builtin_clone_options);
 766
 767         if (option_single_branch == -1)
 768                 option_single_branch = option_depth ? 1 : 0;
 769
 770         if (option_mirror)
 771                 option_bare = 1;
 772
 773         if (option_bare) {
 774                 if (option_origin)
 775                         die(_("--bare and --origin %s options are incompatible."),
 776                             option_origin);
 777                 if (real_git_dir)
 778                         die(_("--bare and --separate-git-dir are incompatible."));
 779                 option_no_checkout = 1;
 780         }
 781
 782         if (!option_origin)
 783                 option_origin = "origin";
 784
 785         repo_name = argv[0];
 786
 787         path = get_repo_path(repo_name, &is_bundle);
 788         if (path)
 789                 repo = xstrdup(absolute_path(repo_name));
 790         else if (!strchr(repo_name, ':'))
 791                 die(_("repository '%s' does not exist"), repo_name);
 792         else
 793                 repo = repo_name;
 794         is_local = option_local != 0 && path && !is_bundle;
 795         if (is_local && option_depth)
 796                 warning(_("--depth is ignored in local clones; use file:// instead."));
 797         if (option_local > 0 && !is_local)
 798                 warning(_("--local is ignored"));
 799
 800         if (argc == 2)
 801                 dir = xstrdup(argv[1]);
 802         else
 803                 dir = guess_dir_name(repo_name, is_bundle, option_bare);
 804         strip_trailing_slashes(dir);
 805
 806         dest_exists = !stat(dir, &buf);
 807         if (dest_exists && !is_empty_dir(dir))
 808                 die(_("destination path '%s' already exists and is not "
 809                         "an empty directory."), dir);
 810
 811         strbuf_addf(&reflog_msg, "clone: from %s", repo);
 812
 813         if (option_bare)
 814                 work_tree = NULL;
 815         else {
 816                 work_tree = getenv("GIT_WORK_TREE");
 817                 if (work_tree && !stat(work_tree, &buf))
 818                         die(_("working tree '%s' already exists."), work_tree);
 819         }
 820
 821         if (option_bare || work_tree)
 822                 git_dir = xstrdup(dir);
 823         else {
 824                 work_tree = dir;
 825                 git_dir = mkpathdup("%s/.git", dir);
 826         }
 827
 828         if (!option_bare) {
 829                 junk_work_tree = work_tree;
 830                 if (safe_create_leading_directories_const(work_tree) < 0)
 831                         die_errno(_("could not create leading directories of '%s'"),
 832                                   work_tree);
 833                 if (!dest_exists && mkdir(work_tree, 0777))
 834                         die_errno(_("could not create work tree dir '%s'."),
 835                                   work_tree);
 836                 set_git_work_tree(work_tree);
 837         }
 838         junk_git_dir = git_dir;
 839         atexit(remove_junk);
 840         sigchain_push_common(remove_junk_on_signal);
 841
 842         if (safe_create_leading_directories_const(git_dir) < 0)
 843                 die(_("could not create leading directories of '%s'"), git_dir);
 844
 845         set_git_dir_init(git_dir, real_git_dir, 0);
 846         if (real_git_dir) {
 847                 git_dir = real_git_dir;
 848                 junk_git_dir = real_git_dir;
 849         }
 850
 851         if (0 <= option_verbosity) {
 852                 if (option_bare)
 853                         printf(_("Cloning into bare repository '%s'...\n"), dir);
 854                 else
 855                         printf(_("Cloning into '%s'...\n"), dir);
 856         }
 857         init_db(option_template, INIT_DB_QUIET);
 858         write_config(&option_config);
 859
 860         git_config(git_default_config, NULL);
 861
 862         if (option_bare) {
 863                 if (option_mirror)
 864                         src_ref_prefix = "refs/";
 865                 strbuf_addstr(&branch_top, src_ref_prefix);
 866
 867                 git_config_set("core.bare", "true");
 868         } else {
 869                 strbuf_addf(&branch_top, "refs/remotes/%s/", option_origin);
 870         }
 871
 872         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top.buf);
 873         strbuf_addf(&key, "remote.%s.url", option_origin);
 874         git_config_set(key.buf, repo);
 875         strbuf_reset(&key);
 876
 877         if (option_reference.nr)
 878                 setup_reference();
 879
 880         fetch_pattern = value.buf;
 881         refspec = parse_fetch_refspec(1, &fetch_pattern);
 882
 883         strbuf_reset(&value);
 884
 885         remote = remote_get(option_origin);
 886         transport = transport_get(remote, remote->url[0]);
 887
 888         if (!is_local) {
 889                 if (!transport->get_refs_list || !transport->fetch)
 890                         die(_("Don't know how to clone %s"), transport->url);
 891
 892                 transport_set_option(transport, TRANS_OPT_KEEP, "yes");
 893
 894                 if (option_depth)
 895                         transport_set_option(transport, TRANS_OPT_DEPTH,
 896                                              option_depth);
 897                 if (option_single_branch)
 898                         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
 899
 900                 transport_set_verbosity(transport, option_verbosity, option_progress);
 901
 902                 if (option_upload_pack)
 903                         transport_set_option(transport, TRANS_OPT_UPLOADPACK,
 904                                              option_upload_pack);
 905
 906                 if (transport->smart_options && !option_depth)
 907                         transport->smart_options->check_self_contained_and_connected = 1;
 908         }
 909
 910         refs = transport_get_remote_refs(transport);
 911
 912         if (refs) {
 913                 mapped_refs = wanted_peer_refs(refs, refspec);
 914                 /*
 915                  * transport_get_remote_refs() may return refs with null sha-1
 916                  * in mapped_refs (see struct transport->get_refs_list
 917                  * comment). In that case we need fetch it early because
 918                  * remote_head code below relies on it.
 919                  *
 920                  * for normal clones, transport_get_remote_refs() should
 921                  * return reliable ref set, we can delay cloning until after
 922                  * remote HEAD check.
 923                  */
 924                 for (ref = refs; ref; ref = ref->next)
 925                         if (is_null_sha1(ref->old_sha1)) {
 926                                 complete_refs_before_fetch = 0;
 927                                 break;
 928                         }
 929
 930                 if (!is_local && !complete_refs_before_fetch)
 931                         transport_fetch_refs(transport, mapped_refs);
 932
 933                 remote_head = find_ref_by_name(refs, "HEAD");
 934                 remote_head_points_at =
 935                         guess_remote_head(remote_head, mapped_refs, 0);
 936
 937                 if (option_branch) {
 938                         our_head_points_at =
 939                                 find_remote_branch(mapped_refs, option_branch);
 940
 941                         if (!our_head_points_at)
 942                                 die(_("Remote branch %s not found in upstream %s"),
 943                                     option_branch, option_origin);
 944                 }
 945                 else
 946                         our_head_points_at = remote_head_points_at;
 947         }
 948         else {
 949                 warning(_("You appear to have cloned an empty repository."));
 950                 mapped_refs = NULL;
 951                 our_head_points_at = NULL;
 952                 remote_head_points_at = NULL;
 953                 remote_head = NULL;
 954                 option_no_checkout = 1;
 955                 if (!option_bare)
 956                         install_branch_config(0, "master", option_origin,
 957                                               "refs/heads/master");
 958         }
 959
 960         write_refspec_config(src_ref_prefix, our_head_points_at,
 961                         remote_head_points_at, &branch_top);
 962
 963         if (is_local)
 964                 clone_local(path, git_dir);
 965         else if (refs && complete_refs_before_fetch)
 966                 transport_fetch_refs(transport, mapped_refs);
 967
 968         update_remote_refs(refs, mapped_refs, remote_head_points_at,
 969                            branch_top.buf, reflog_msg.buf, transport, !is_local);
 970
 971         update_head(our_head_points_at, remote_head, reflog_msg.buf);
 972
 973         transport_unlock_pack(transport);
 974         transport_disconnect(transport);
 975
 976         junk_mode = JUNK_LEAVE_REPO;
 977         err = checkout();
 978
 979         strbuf_release(&reflog_msg);
 980         strbuf_release(&branch_top);
 981         strbuf_release(&key);
 982         strbuf_release(&value);
 983         junk_mode = JUNK_LEAVE_ALL;
 984         return err;
 985 }