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_BOOL('n', "no-checkout", &option_no_checkout,
  66                  N_("don't create a checkout")),
  67         OPT_BOOL(0, "bare", &option_bare, N_("create a bare repository")),
  68         OPT_HIDDEN_BOOL(0, "naked", &option_bare,
  69                         N_("create a bare repository")),
  70         OPT_BOOL(0, "mirror", &option_mirror,
  71                  N_("create a mirror repository (implies bare)")),
  72         OPT_BOOL('l', "local", &option_local,
  73                 N_("to clone from a local repository")),
  74         OPT_BOOL(0, "no-hardlinks", &option_no_hardlinks,
  75                     N_("don't use local hardlinks, always copy")),
  76         OPT_BOOL('s', "shared", &option_shared,
  77                     N_("setup as shared repository")),
  78         OPT_BOOL(0, "recursive", &option_recursive,
  79                     N_("initialize submodules in the clone")),
  80         OPT_BOOL(0, "recurse-submodules", &option_recursive,
  81                     N_("initialize submodules in the clone")),
  82         OPT_STRING(0, "template", &option_template, N_("template-directory"),
  83                    N_("directory from which templates will be used")),
  84         OPT_CALLBACK(0 , "reference", &option_reference, N_("repo"),
  85                      N_("reference repository"), &opt_parse_reference),
  86         OPT_STRING('o', "origin", &option_origin, N_("name"),
  87                    N_("use <name> instead of 'origin' to track upstream")),
  88         OPT_STRING('b', "branch", &option_branch, N_("branch"),
  89                    N_("checkout <branch> instead of the remote's HEAD")),
  90         OPT_STRING('u', "upload-pack", &option_upload_pack, N_("path"),
  91                    N_("path to git-upload-pack on the remote")),
  92         OPT_STRING(0, "depth", &option_depth, N_("depth"),
  93                     N_("create a shallow clone of that depth")),
  94         OPT_BOOL(0, "single-branch", &option_single_branch,
  95                     N_("clone only one branch, HEAD or --branch")),
  96         OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
  97                    N_("separate git dir from working tree")),
  98         OPT_STRING_LIST('c', "config", &option_config, N_("key=value"),
  99                         N_("set config inside the new repository")),
 100         OPT_END()
 101 };
 102
 103 static const char *argv_submodule[] = {
 104         "submodule", "update", "--init", "--recursive", NULL
 105 };
 106
 107 static char *get_repo_path(const char *repo, int *is_bundle)
 108 {
 109         static char *suffix[] = { "/.git", "", ".git/.git", ".git" };
 110         static char *bundle_suffix[] = { ".bundle", "" };
 111         struct stat st;
 112         int i;
 113
 114         for (i = 0; i < ARRAY_SIZE(suffix); i++) {
 115                 const char *path;
 116                 path = mkpath("%s%s", repo, suffix[i]);
 117                 if (stat(path, &st))
 118                         continue;
 119                 if (S_ISDIR(st.st_mode) && is_git_directory(path)) {
 120                         *is_bundle = 0;
 121                         return xstrdup(absolute_path(path));
 122                 } else if (S_ISREG(st.st_mode) && st.st_size > 8) {
 123                         /* Is it a "gitfile"? */
 124                         char signature[8];
 125                         int len, fd = open(path, O_RDONLY);
 126                         if (fd < 0)
 127                                 continue;
 128                         len = read_in_full(fd, signature, 8);
 129                         close(fd);
 130                         if (len != 8 || strncmp(signature, "gitdir: ", 8))
 131                                 continue;
 132                         path = read_gitfile(path);
 133                         if (path) {
 134                                 *is_bundle = 0;
 135                                 return xstrdup(absolute_path(path));
 136                         }
 137                 }
 138         }
 139
 140         for (i = 0; i < ARRAY_SIZE(bundle_suffix); i++) {
 141                 const char *path;
 142                 path = mkpath("%s%s", repo, bundle_suffix[i]);
 143                 if (!stat(path, &st) && S_ISREG(st.st_mode)) {
 144                         *is_bundle = 1;
 145                         return xstrdup(absolute_path(path));
 146                 }
 147         }
 148
 149         return NULL;
 150 }
 151
 152 static char *guess_dir_name(const char *repo, int is_bundle, int is_bare)
 153 {
 154         const char *end = repo + strlen(repo), *start;
 155         char *dir;
 156
 157         /*
 158          * Strip trailing spaces, slashes and /.git
 159          */
 160         while (repo < end && (is_dir_sep(end[-1]) || isspace(end[-1])))
 161                 end--;
 162         if (end - repo > 5 && is_dir_sep(end[-5]) &&
 163             !strncmp(end - 4, ".git", 4)) {
 164                 end -= 5;
 165                 while (repo < end && is_dir_sep(end[-1]))
 166                         end--;
 167         }
 168
 169         /*
 170          * Find last component, but be prepared that repo could have
 171          * the form  "remote.example.com:foo.git", i.e. no slash
 172          * in the directory part.
 173          */
 174         start = end;
 175         while (repo < start && !is_dir_sep(start[-1]) && start[-1] != ':')
 176                 start--;
 177
 178         /*
 179          * Strip .{bundle,git}.
 180          */
 181         if (is_bundle) {
 182                 if (end - start > 7 && !strncmp(end - 7, ".bundle", 7))
 183                         end -= 7;
 184         } else {
 185                 if (end - start > 4 && !strncmp(end - 4, ".git", 4))
 186                         end -= 4;
 187         }
 188
 189         if (is_bare) {
 190                 struct strbuf result = STRBUF_INIT;
 191                 strbuf_addf(&result, "%.*s.git", (int)(end - start), start);
 192                 dir = strbuf_detach(&result, NULL);
 193         } else
 194                 dir = xstrndup(start, end - start);
 195         /*
 196          * Replace sequences of 'control' characters and whitespace
 197          * with one ascii space, remove leading and trailing spaces.
 198          */
 199         if (*dir) {
 200                 char *out = dir;
 201                 int prev_space = 1 /* strip leading whitespace */;
 202                 for (end = dir; *end; ++end) {
 203                         char ch = *end;
 204                         if ((unsigned char)ch < '\x20')
 205                                 ch = '\x20';
 206                         if (isspace(ch)) {
 207                                 if (prev_space)
 208                                         continue;
 209                                 prev_space = 1;
 210                         } else
 211                                 prev_space = 0;
 212                         *out++ = ch;
 213                 }
 214                 *out = '\0';
 215                 if (out > dir && prev_space)
 216                         out[-1] = '\0';
 217         }
 218         return dir;
 219 }
 220
 221 static void strip_trailing_slashes(char *dir)
 222 {
 223         char *end = dir + strlen(dir);
 224
 225         while (dir < end - 1 && is_dir_sep(end[-1]))
 226                 end--;
 227         *end = '\0';
 228 }
 229
 230 static int add_one_reference(struct string_list_item *item, void *cb_data)
 231 {
 232         char *ref_git;
 233         const char *repo;
 234         struct strbuf alternate = STRBUF_INIT;
 235
 236         /* Beware: read_gitfile(), real_path() and mkpath() return static buffer */
 237         ref_git = xstrdup(real_path(item->string));
 238
 239         repo = read_gitfile(ref_git);
 240         if (!repo)
 241                 repo = read_gitfile(mkpath("%s/.git", ref_git));
 242         if (repo) {
 243                 free(ref_git);
 244                 ref_git = xstrdup(repo);
 245         }
 246
 247         if (!repo && is_directory(mkpath("%s/.git/objects", ref_git))) {
 248                 char *ref_git_git = mkpathdup("%s/.git", ref_git);
 249                 free(ref_git);
 250                 ref_git = ref_git_git;
 251         } else if (!is_directory(mkpath("%s/objects", ref_git)))
 252                 die(_("reference repository '%s' is not a local repository."),
 253                     item->string);
 254
 255         if (!access(mkpath("%s/shallow", ref_git), F_OK))
 256                 die(_("reference repository '%s' is shallow"), item->string);
 257
 258         if (!access(mkpath("%s/info/grafts", ref_git), F_OK))
 259                 die(_("reference repository '%s' is grafted"), item->string);
 260
 261         strbuf_addf(&alternate, "%s/objects", ref_git);
 262         add_to_alternates_file(alternate.buf);
 263         strbuf_release(&alternate);
 264         free(ref_git);
 265         return 0;
 266 }
 267
 268 static void setup_reference(void)
 269 {
 270         for_each_string_list(&option_reference, add_one_reference, NULL);
 271 }
 272
 273 static void copy_alternates(struct strbuf *src, struct strbuf *dst,
 274                             const char *src_repo)
 275 {
 276         /*
 277          * Read from the source objects/info/alternates file
 278          * and copy the entries to corresponding file in the
 279          * destination repository with add_to_alternates_file().
 280          * Both src and dst have "$path/objects/info/alternates".
 281          *
 282          * Instead of copying bit-for-bit from the original,
 283          * we need to append to existing one so that the already
 284          * created entry via "clone -s" is not lost, and also
 285          * to turn entries with paths relative to the original
 286          * absolute, so that they can be used in the new repository.
 287          */
 288         FILE *in = fopen(src->buf, "r");
 289         struct strbuf line = STRBUF_INIT;
 290
 291         while (strbuf_getline(&line, in, '\n') != EOF) {
 292                 char *abs_path;
 293                 if (!line.len || line.buf[0] == '#')
 294                         continue;
 295                 if (is_absolute_path(line.buf)) {
 296                         add_to_alternates_file(line.buf);
 297                         continue;
 298                 }
 299                 abs_path = mkpathdup("%s/objects/%s", src_repo, line.buf);
 300                 normalize_path_copy(abs_path, abs_path);
 301                 add_to_alternates_file(abs_path);
 302                 free(abs_path);
 303         }
 304         strbuf_release(&line);
 305         fclose(in);
 306 }
 307
 308 static void copy_or_link_directory(struct strbuf *src, struct strbuf *dest,
 309                                    const char *src_repo, int src_baselen)
 310 {
 311         struct dirent *de;
 312         struct stat buf;
 313         int src_len, dest_len;
 314         DIR *dir;
 315
 316         dir = opendir(src->buf);
 317         if (!dir)
 318                 die_errno(_("failed to open '%s'"), src->buf);
 319
 320         if (mkdir(dest->buf, 0777)) {
 321                 if (errno != EEXIST)
 322                         die_errno(_("failed to create directory '%s'"), dest->buf);
 323                 else if (stat(dest->buf, &buf))
 324                         die_errno(_("failed to stat '%s'"), dest->buf);
 325                 else if (!S_ISDIR(buf.st_mode))
 326                         die(_("%s exists and is not a directory"), dest->buf);
 327         }
 328
 329         strbuf_addch(src, '/');
 330         src_len = src->len;
 331         strbuf_addch(dest, '/');
 332         dest_len = dest->len;
 333
 334         while ((de = readdir(dir)) != NULL) {
 335                 strbuf_setlen(src, src_len);
 336                 strbuf_addstr(src, de->d_name);
 337                 strbuf_setlen(dest, dest_len);
 338                 strbuf_addstr(dest, de->d_name);
 339                 if (stat(src->buf, &buf)) {
 340                         warning (_("failed to stat %s\n"), src->buf);
 341                         continue;
 342                 }
 343                 if (S_ISDIR(buf.st_mode)) {
 344                         if (de->d_name[0] != '.')
 345                                 copy_or_link_directory(src, dest,
 346                                                        src_repo, src_baselen);
 347                         continue;
 348                 }
 349
 350                 /* Files that cannot be copied bit-for-bit... */
 351                 if (!strcmp(src->buf + src_baselen, "/info/alternates")) {
 352                         copy_alternates(src, dest, src_repo);
 353                         continue;
 354                 }
 355
 356                 if (unlink(dest->buf) && errno != ENOENT)
 357                         die_errno(_("failed to unlink '%s'"), dest->buf);
 358                 if (!option_no_hardlinks) {
 359                         if (!link(src->buf, dest->buf))
 360                                 continue;
 361                         if (option_local > 0)
 362                                 die_errno(_("failed to create link '%s'"), dest->buf);
 363                         option_no_hardlinks = 1;
 364                 }
 365                 if (copy_file_with_time(dest->buf, src->buf, 0666))
 366                         die_errno(_("failed to copy file to '%s'"), dest->buf);
 367         }
 368         closedir(dir);
 369 }
 370
 371 static void clone_local(const char *src_repo, const char *dest_repo)
 372 {
 373         if (option_shared) {
 374                 struct strbuf alt = STRBUF_INIT;
 375                 strbuf_addf(&alt, "%s/objects", src_repo);
 376                 add_to_alternates_file(alt.buf);
 377                 strbuf_release(&alt);
 378         } else {
 379                 struct strbuf src = STRBUF_INIT;
 380                 struct strbuf dest = STRBUF_INIT;
 381                 strbuf_addf(&src, "%s/objects", src_repo);
 382                 strbuf_addf(&dest, "%s/objects", dest_repo);
 383                 copy_or_link_directory(&src, &dest, src_repo, src.len);
 384                 strbuf_release(&src);
 385                 strbuf_release(&dest);
 386         }
 387
 388         if (0 <= option_verbosity)
 389                 fprintf(stderr, _("done.\n"));
 390 }
 391
 392 static const char *junk_work_tree;
 393 static const char *junk_git_dir;
 394 static pid_t junk_pid;
 395 static enum {
 396         JUNK_LEAVE_NONE,
 397         JUNK_LEAVE_REPO,
 398         JUNK_LEAVE_ALL
 399 } junk_mode = JUNK_LEAVE_NONE;
 400
 401 static const char junk_leave_repo_msg[] =
 402 N_("Clone succeeded, but checkout failed.\n"
 403    "You can inspect what was checked out with 'git status'\n"
 404    "and retry the checkout with 'git checkout -f HEAD'\n");
 405
 406 static void remove_junk(void)
 407 {
 408         struct strbuf sb = STRBUF_INIT;
 409
 410         switch (junk_mode) {
 411         case JUNK_LEAVE_REPO:
 412                 warning("%s", _(junk_leave_repo_msg));
 413                 /* fall-through */
 414         case JUNK_LEAVE_ALL:
 415                 return;
 416         default:
 417                 /* proceed to removal */
 418                 break;
 419         }
 420
 421         if (getpid() != junk_pid)
 422                 return;
 423         if (junk_git_dir) {
 424                 strbuf_addstr(&sb, junk_git_dir);
 425                 remove_dir_recursively(&sb, 0);
 426                 strbuf_reset(&sb);
 427         }
 428         if (junk_work_tree) {
 429                 strbuf_addstr(&sb, junk_work_tree);
 430                 remove_dir_recursively(&sb, 0);
 431                 strbuf_reset(&sb);
 432         }
 433 }
 434
 435 static void remove_junk_on_signal(int signo)
 436 {
 437         remove_junk();
 438         sigchain_pop(signo);
 439         raise(signo);
 440 }
 441
 442 static struct ref *find_remote_branch(const struct ref *refs, const char *branch)
 443 {
 444         struct ref *ref;
 445         struct strbuf head = STRBUF_INIT;
 446         strbuf_addstr(&head, "refs/heads/");
 447         strbuf_addstr(&head, branch);
 448         ref = find_ref_by_name(refs, head.buf);
 449         strbuf_release(&head);
 450
 451         if (ref)
 452                 return ref;
 453
 454         strbuf_addstr(&head, "refs/tags/");
 455         strbuf_addstr(&head, branch);
 456         ref = find_ref_by_name(refs, head.buf);
 457         strbuf_release(&head);
 458
 459         return ref;
 460 }
 461
 462 static struct ref *wanted_peer_refs(const struct ref *refs,
 463                 struct refspec *refspec)
 464 {
 465         struct ref *head = copy_ref(find_ref_by_name(refs, "HEAD"));
 466         struct ref *local_refs = head;
 467         struct ref **tail = head ? &head->next : &local_refs;
 468
 469         if (option_single_branch) {
 470                 struct ref *remote_head = NULL;
 471
 472                 if (!option_branch)
 473                         remote_head = guess_remote_head(head, refs, 0);
 474                 else {
 475                         local_refs = NULL;
 476                         tail = &local_refs;
 477                         remote_head = copy_ref(find_remote_branch(refs, option_branch));
 478                 }
 479
 480                 if (!remote_head && option_branch)
 481                         warning(_("Could not find remote branch %s to clone."),
 482                                 option_branch);
 483                 else {
 484                         get_fetch_map(remote_head, refspec, &tail, 0);
 485
 486                         /* if --branch=tag, pull the requested tag explicitly */
 487                         get_fetch_map(remote_head, tag_refspec, &tail, 0);
 488                 }
 489         } else
 490                 get_fetch_map(refs, refspec, &tail, 0);
 491
 492         if (!option_mirror && !option_single_branch)
 493                 get_fetch_map(refs, tag_refspec, &tail, 0);
 494
 495         return local_refs;
 496 }
 497
 498 static void write_remote_refs(const struct ref *local_refs)
 499 {
 500         const struct ref *r;
 501
 502         lock_packed_refs(LOCK_DIE_ON_ERROR);
 503
 504         for (r = local_refs; r; r = r->next) {
 505                 if (!r->peer_ref)
 506                         continue;
 507                 add_packed_ref(r->peer_ref->name, r->old_sha1);
 508         }
 509
 510         if (commit_packed_refs())
 511                 die_errno("unable to overwrite old ref-pack file");
 512 }
 513
 514 static void write_followtags(const struct ref *refs, const char *msg)
 515 {
 516         const struct ref *ref;
 517         for (ref = refs; ref; ref = ref->next) {
 518                 if (!starts_with(ref->name, "refs/tags/"))
 519                         continue;
 520                 if (ends_with(ref->name, "^{}"))
 521                         continue;
 522                 if (!has_sha1_file(ref->old_sha1))
 523                         continue;
 524                 update_ref(msg, ref->name, ref->old_sha1,
 525                            NULL, 0, UPDATE_REFS_DIE_ON_ERR);
 526         }
 527 }
 528
 529 static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
 530 {
 531         struct ref **rm = cb_data;
 532         struct ref *ref = *rm;
 533
 534         /*
 535          * Skip anything missing a peer_ref, which we are not
 536          * actually going to write a ref for.
 537          */
 538         while (ref && !ref->peer_ref)
 539                 ref = ref->next;
 540         /* Returning -1 notes "end of list" to the caller. */
 541         if (!ref)
 542                 return -1;
 543
 544         hashcpy(sha1, ref->old_sha1);
 545         *rm = ref->next;
 546         return 0;
 547 }
 548
 549 static void update_remote_refs(const struct ref *refs,
 550                                const struct ref *mapped_refs,
 551                                const struct ref *remote_head_points_at,
 552                                const char *branch_top,
 553                                const char *msg,
 554                                struct transport *transport,
 555                                int check_connectivity)
 556 {
 557         const struct ref *rm = mapped_refs;
 558
 559         if (check_connectivity) {
 560                 if (transport->progress)
 561                         fprintf(stderr, _("Checking connectivity... "));
 562                 if (check_everything_connected_with_transport(iterate_ref_map,
 563                                                               0, &rm, transport))
 564                         die(_("remote did not send all necessary objects"));
 565                 if (transport->progress)
 566                         fprintf(stderr, _("done.\n"));
 567         }
 568
 569         if (refs) {
 570                 write_remote_refs(mapped_refs);
 571                 if (option_single_branch)
 572                         write_followtags(refs, msg);
 573         }
 574
 575         if (remote_head_points_at && !option_bare) {
 576                 struct strbuf head_ref = STRBUF_INIT;
 577                 strbuf_addstr(&head_ref, branch_top);
 578                 strbuf_addstr(&head_ref, "HEAD");
 579                 create_symref(head_ref.buf,
 580                               remote_head_points_at->peer_ref->name,
 581                               msg);
 582         }
 583 }
 584
 585 static void update_head(const struct ref *our, const struct ref *remote,
 586                         const char *msg)
 587 {
 588         const char *head;
 589         if (our && skip_prefix(our->name, "refs/heads/", &head)) {
 590                 /* Local default branch link */
 591                 create_symref("HEAD", our->name, NULL);
 592                 if (!option_bare) {
 593                         update_ref(msg, "HEAD", our->old_sha1, NULL, 0,
 594                                    UPDATE_REFS_DIE_ON_ERR);
 595                         install_branch_config(0, head, option_origin, our->name);
 596                 }
 597         } else if (our) {
 598                 struct commit *c = lookup_commit_reference(our->old_sha1);
 599                 /* --branch specifies a non-branch (i.e. tags), detach HEAD */
 600                 update_ref(msg, "HEAD", c->object.sha1,
 601                            NULL, REF_NODEREF, UPDATE_REFS_DIE_ON_ERR);
 602         } else if (remote) {
 603                 /*
 604                  * We know remote HEAD points to a non-branch, or
 605                  * HEAD points to a branch but we don't know which one.
 606                  * Detach HEAD in all these cases.
 607                  */
 608                 update_ref(msg, "HEAD", remote->old_sha1,
 609                            NULL, REF_NODEREF, UPDATE_REFS_DIE_ON_ERR);
 610         }
 611 }
 612
 613 static int checkout(void)
 614 {
 615         unsigned char sha1[20];
 616         char *head;
 617         struct lock_file *lock_file;
 618         struct unpack_trees_options opts;
 619         struct tree *tree;
 620         struct tree_desc t;
 621         int err = 0;
 622
 623         if (option_no_checkout)
 624                 return 0;
 625
 626         head = resolve_refdup("HEAD", sha1, 1, NULL);
 627         if (!head) {
 628                 warning(_("remote HEAD refers to nonexistent ref, "
 629                           "unable to checkout.\n"));
 630                 return 0;
 631         }
 632         if (!strcmp(head, "HEAD")) {
 633                 if (advice_detached_head)
 634                         detach_advice(sha1_to_hex(sha1));
 635         } else {
 636                 if (!starts_with(head, "refs/heads/"))
 637                         die(_("HEAD not found below refs/heads!"));
 638         }
 639         free(head);
 640
 641         /* We need to be in the new work tree for the checkout */
 642         setup_work_tree();
 643
 644         lock_file = xcalloc(1, sizeof(struct lock_file));
 645         hold_locked_index(lock_file, 1);
 646
 647         memset(&opts, 0, sizeof opts);
 648         opts.update = 1;
 649         opts.merge = 1;
 650         opts.fn = oneway_merge;
 651         opts.verbose_update = (option_verbosity >= 0);
 652         opts.src_index = &the_index;
 653         opts.dst_index = &the_index;
 654
 655         tree = parse_tree_indirect(sha1);
 656         parse_tree(tree);
 657         init_tree_desc(&t, tree->buffer, tree->size);
 658         if (unpack_trees(1, &t, &opts) < 0)
 659                 die(_("unable to checkout working tree"));
 660
 661         if (write_locked_index(&the_index, lock_file, COMMIT_LOCK))
 662                 die(_("unable to write new index file"));
 663
 664         err |= run_hook_le(NULL, "post-checkout", sha1_to_hex(null_sha1),
 665                            sha1_to_hex(sha1), "1", NULL);
 666
 667         if (!err && option_recursive)
 668                 err = run_command_v_opt(argv_submodule, RUN_GIT_CMD);
 669
 670         return err;
 671 }
 672
 673 static int write_one_config(const char *key, const char *value, void *data)
 674 {
 675         return git_config_set_multivar(key, value ? value : "true", "^$", 0);
 676 }
 677
 678 static void write_config(struct string_list *config)
 679 {
 680         int i;
 681
 682         for (i = 0; i < config->nr; i++) {
 683                 if (git_config_parse_parameter(config->items[i].string,
 684                                                write_one_config, NULL) < 0)
 685                         die("unable to write parameters to config file");
 686         }
 687 }
 688
 689 static void write_refspec_config(const char* src_ref_prefix,
 690                 const struct ref* our_head_points_at,
 691                 const struct ref* remote_head_points_at, struct strbuf* branch_top)
 692 {
 693         struct strbuf key = STRBUF_INIT;
 694         struct strbuf value = STRBUF_INIT;
 695
 696         if (option_mirror || !option_bare) {
 697                 if (option_single_branch && !option_mirror) {
 698                         if (option_branch) {
 699                                 if (starts_with(our_head_points_at->name, "refs/tags/"))
 700                                         strbuf_addf(&value, "+%s:%s", our_head_points_at->name,
 701                                                 our_head_points_at->name);
 702                                 else
 703                                         strbuf_addf(&value, "+%s:%s%s", our_head_points_at->name,
 704                                                 branch_top->buf, option_branch);
 705                         } else if (remote_head_points_at) {
 706                                 const char *head = remote_head_points_at->name;
 707                                 if (!skip_prefix(head, "refs/heads/", &head))
 708                                         die("BUG: remote HEAD points at non-head?");
 709
 710                                 strbuf_addf(&value, "+%s:%s%s", remote_head_points_at->name,
 711                                                 branch_top->buf, head);
 712                         }
 713                         /*
 714                          * otherwise, the next "git fetch" will
 715                          * simply fetch from HEAD without updating
 716                          * any remote-tracking branch, which is what
 717                          * we want.
 718                          */
 719                 } else {
 720                         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top->buf);
 721                 }
 722                 /* Configure the remote */
 723                 if (value.len) {
 724                         strbuf_addf(&key, "remote.%s.fetch", option_origin);
 725                         git_config_set_multivar(key.buf, value.buf, "^$", 0);
 726                         strbuf_reset(&key);
 727
 728                         if (option_mirror) {
 729                                 strbuf_addf(&key, "remote.%s.mirror", option_origin);
 730                                 git_config_set(key.buf, "true");
 731                                 strbuf_reset(&key);
 732                         }
 733                 }
 734         }
 735
 736         strbuf_release(&key);
 737         strbuf_release(&value);
 738 }
 739
 740 int cmd_clone(int argc, const char **argv, const char *prefix)
 741 {
 742         int is_bundle = 0, is_local;
 743         struct stat buf;
 744         const char *repo_name, *repo, *work_tree, *git_dir;
 745         char *path, *dir;
 746         int dest_exists;
 747         const struct ref *refs, *remote_head;
 748         const struct ref *remote_head_points_at;
 749         const struct ref *our_head_points_at;
 750         struct ref *mapped_refs;
 751         const struct ref *ref;
 752         struct strbuf key = STRBUF_INIT, value = STRBUF_INIT;
 753         struct strbuf branch_top = STRBUF_INIT, reflog_msg = STRBUF_INIT;
 754         struct transport *transport = NULL;
 755         const char *src_ref_prefix = "refs/heads/";
 756         struct remote *remote;
 757         int err = 0, complete_refs_before_fetch = 1;
 758
 759         struct refspec *refspec;
 760         const char *fetch_pattern;
 761
 762         junk_pid = getpid();
 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         if (!option_bare) {
 837                 junk_work_tree = work_tree;
 838                 if (safe_create_leading_directories_const(work_tree) < 0)
 839                         die_errno(_("could not create leading directories of '%s'"),
 840                                   work_tree);
 841                 if (!dest_exists && mkdir(work_tree, 0777))
 842                         die_errno(_("could not create work tree dir '%s'."),
 843                                   work_tree);
 844                 set_git_work_tree(work_tree);
 845         }
 846         junk_git_dir = git_dir;
 847         atexit(remove_junk);
 848         sigchain_push_common(remove_junk_on_signal);
 849
 850         if (safe_create_leading_directories_const(git_dir) < 0)
 851                 die(_("could not create leading directories of '%s'"), git_dir);
 852
 853         set_git_dir_init(git_dir, real_git_dir, 0);
 854         if (real_git_dir) {
 855                 git_dir = real_git_dir;
 856                 junk_git_dir = real_git_dir;
 857         }
 858
 859         if (0 <= option_verbosity) {
 860                 if (option_bare)
 861                         fprintf(stderr, _("Cloning into bare repository '%s'...\n"), dir);
 862                 else
 863                         fprintf(stderr, _("Cloning into '%s'...\n"), dir);
 864         }
 865         init_db(option_template, INIT_DB_QUIET);
 866         write_config(&option_config);
 867
 868         git_config(git_default_config, NULL);
 869
 870         if (option_bare) {
 871                 if (option_mirror)
 872                         src_ref_prefix = "refs/";
 873                 strbuf_addstr(&branch_top, src_ref_prefix);
 874
 875                 git_config_set("core.bare", "true");
 876         } else {
 877                 strbuf_addf(&branch_top, "refs/remotes/%s/", option_origin);
 878         }
 879
 880         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top.buf);
 881         strbuf_addf(&key, "remote.%s.url", option_origin);
 882         git_config_set(key.buf, repo);
 883         strbuf_reset(&key);
 884
 885         if (option_reference.nr)
 886                 setup_reference();
 887
 888         fetch_pattern = value.buf;
 889         refspec = parse_fetch_refspec(1, &fetch_pattern);
 890
 891         strbuf_reset(&value);
 892
 893         remote = remote_get(option_origin);
 894         transport = transport_get(remote, remote->url[0]);
 895         path = get_repo_path(remote->url[0], &is_bundle);
 896         is_local = option_local != 0 && path && !is_bundle;
 897         if (is_local) {
 898                 if (option_depth)
 899                         warning(_("--depth is ignored in local clones; use file:// instead."));
 900                 if (!access(mkpath("%s/shallow", path), F_OK)) {
 901                         if (option_local > 0)
 902                                 warning(_("source repository is shallow, ignoring --local"));
 903                         is_local = 0;
 904                 }
 905         }
 906         if (option_local > 0 && !is_local)
 907                 warning(_("--local is ignored"));
 908         transport->cloning = 1;
 909
 910         if (!transport->get_refs_list || (!is_local && !transport->fetch))
 911                 die(_("Don't know how to clone %s"), transport->url);
 912
 913         transport_set_option(transport, TRANS_OPT_KEEP, "yes");
 914
 915         if (option_depth)
 916                 transport_set_option(transport, TRANS_OPT_DEPTH,
 917                                      option_depth);
 918         if (option_single_branch)
 919                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
 920
 921         transport_set_verbosity(transport, option_verbosity, option_progress);
 922
 923         if (option_upload_pack)
 924                 transport_set_option(transport, TRANS_OPT_UPLOADPACK,
 925                                      option_upload_pack);
 926
 927         if (transport->smart_options && !option_depth)
 928                 transport->smart_options->check_self_contained_and_connected = 1;
 929
 930         refs = transport_get_remote_refs(transport);
 931
 932         if (refs) {
 933                 mapped_refs = wanted_peer_refs(refs, refspec);
 934                 /*
 935                  * transport_get_remote_refs() may return refs with null sha-1
 936                  * in mapped_refs (see struct transport->get_refs_list
 937                  * comment). In that case we need fetch it early because
 938                  * remote_head code below relies on it.
 939                  *
 940                  * for normal clones, transport_get_remote_refs() should
 941                  * return reliable ref set, we can delay cloning until after
 942                  * remote HEAD check.
 943                  */
 944                 for (ref = refs; ref; ref = ref->next)
 945                         if (is_null_sha1(ref->old_sha1)) {
 946                                 complete_refs_before_fetch = 0;
 947                                 break;
 948                         }
 949
 950                 if (!is_local && !complete_refs_before_fetch)
 951                         transport_fetch_refs(transport, mapped_refs);
 952
 953                 remote_head = find_ref_by_name(refs, "HEAD");
 954                 remote_head_points_at =
 955                         guess_remote_head(remote_head, mapped_refs, 0);
 956
 957                 if (option_branch) {
 958                         our_head_points_at =
 959                                 find_remote_branch(mapped_refs, option_branch);
 960
 961                         if (!our_head_points_at)
 962                                 die(_("Remote branch %s not found in upstream %s"),
 963                                     option_branch, option_origin);
 964                 }
 965                 else
 966                         our_head_points_at = remote_head_points_at;
 967         }
 968         else {
 969                 if (option_branch)
 970                         die(_("Remote branch %s not found in upstream %s"),
 971                                         option_branch, option_origin);
 972
 973                 warning(_("You appear to have cloned an empty repository."));
 974                 mapped_refs = NULL;
 975                 our_head_points_at = NULL;
 976                 remote_head_points_at = NULL;
 977                 remote_head = NULL;
 978                 option_no_checkout = 1;
 979                 if (!option_bare)
 980                         install_branch_config(0, "master", option_origin,
 981                                               "refs/heads/master");
 982         }
 983
 984         write_refspec_config(src_ref_prefix, our_head_points_at,
 985                         remote_head_points_at, &branch_top);
 986
 987         if (is_local)
 988                 clone_local(path, git_dir);
 989         else if (refs && complete_refs_before_fetch)
 990                 transport_fetch_refs(transport, mapped_refs);
 991
 992         update_remote_refs(refs, mapped_refs, remote_head_points_at,
 993                            branch_top.buf, reflog_msg.buf, transport, !is_local);
 994
 995         update_head(our_head_points_at, remote_head, reflog_msg.buf);
 996
 997         transport_unlock_pack(transport);
 998         transport_disconnect(transport);
 999
1000         junk_mode = JUNK_LEAVE_REPO;
1001         err = checkout();
1002
1003         strbuf_release(&reflog_msg);
1004         strbuf_release(&branch_top);
1005         strbuf_release(&key);
1006         strbuf_release(&value);
1007         junk_mode = JUNK_LEAVE_ALL;
1008         return err;
1009 }