git.oblomov.eu Git - git/blob - builtin/clone.c

   1 /*
   2  * Builtin "git clone"
   3  *
   4  * Copyright (c) 2007 Kristian Høgsberg <krh@redhat.com>,
   5  *               2008 Daniel Barkalow <barkalow@iabervon.org>
   6  * Based on git-commit.sh by Junio C Hamano and Linus Torvalds
   7  *
   8  * Clone a repository into a different directory that does not yet exist.
   9  */
  10
  11 #include "builtin.h"
  12 #include "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 static int option_dissociate;
  52
  53 static int opt_parse_reference(const struct option *opt, const char *arg, int unset)
  54 {
  55         struct string_list *option_reference = opt->value;
  56         if (!arg)
  57                 return -1;
  58         string_list_append(option_reference, arg);
  59         return 0;
  60 }
  61
  62 static struct option builtin_clone_options[] = {
  63         OPT__VERBOSITY(&option_verbosity),
  64         OPT_BOOL(0, "progress", &option_progress,
  65                  N_("force progress reporting")),
  66         OPT_BOOL('n', "no-checkout", &option_no_checkout,
  67                  N_("don't create a checkout")),
  68         OPT_BOOL(0, "bare", &option_bare, N_("create a bare repository")),
  69         OPT_HIDDEN_BOOL(0, "naked", &option_bare,
  70                         N_("create a bare repository")),
  71         OPT_BOOL(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_BOOL(0, "no-hardlinks", &option_no_hardlinks,
  76                     N_("don't use local hardlinks, always copy")),
  77         OPT_BOOL('s', "shared", &option_shared,
  78                     N_("setup as shared repository")),
  79         OPT_BOOL(0, "recursive", &option_recursive,
  80                     N_("initialize submodules in the clone")),
  81         OPT_BOOL(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_BOOL(0, "dissociate", &option_dissociate,
  98                  N_("use --reference only while cloning")),
  99         OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
 100                    N_("separate git dir from working tree")),
 101         OPT_STRING_LIST('c', "config", &option_config, N_("key=value"),
 102                         N_("set config inside the new repository")),
 103         OPT_END()
 104 };
 105
 106 static const char *argv_submodule[] = {
 107         "submodule", "update", "--init", "--recursive", NULL
 108 };
 109
 110 static char *get_repo_path(const char *repo, int *is_bundle)
 111 {
 112         static char *suffix[] = { "/.git", "", ".git/.git", ".git" };
 113         static char *bundle_suffix[] = { ".bundle", "" };
 114         struct stat st;
 115         int i;
 116
 117         for (i = 0; i < ARRAY_SIZE(suffix); i++) {
 118                 const char *path;
 119                 path = mkpath("%s%s", repo, suffix[i]);
 120                 if (stat(path, &st))
 121                         continue;
 122                 if (S_ISDIR(st.st_mode) && is_git_directory(path)) {
 123                         *is_bundle = 0;
 124                         return xstrdup(absolute_path(path));
 125                 } else if (S_ISREG(st.st_mode) && st.st_size > 8) {
 126                         /* Is it a "gitfile"? */
 127                         char signature[8];
 128                         int len, fd = open(path, O_RDONLY);
 129                         if (fd < 0)
 130                                 continue;
 131                         len = read_in_full(fd, signature, 8);
 132                         close(fd);
 133                         if (len != 8 || strncmp(signature, "gitdir: ", 8))
 134                                 continue;
 135                         path = read_gitfile(path);
 136                         if (path) {
 137                                 *is_bundle = 0;
 138                                 return xstrdup(absolute_path(path));
 139                         }
 140                 }
 141         }
 142
 143         for (i = 0; i < ARRAY_SIZE(bundle_suffix); i++) {
 144                 const char *path;
 145                 path = mkpath("%s%s", repo, bundle_suffix[i]);
 146                 if (!stat(path, &st) && S_ISREG(st.st_mode)) {
 147                         *is_bundle = 1;
 148                         return xstrdup(absolute_path(path));
 149                 }
 150         }
 151
 152         return NULL;
 153 }
 154
 155 static char *guess_dir_name(const char *repo, int is_bundle, int is_bare)
 156 {
 157         const char *end = repo + strlen(repo), *start;
 158         char *dir;
 159
 160         /*
 161          * Strip trailing spaces, slashes and /.git
 162          */
 163         while (repo < end && (is_dir_sep(end[-1]) || isspace(end[-1])))
 164                 end--;
 165         if (end - repo > 5 && is_dir_sep(end[-5]) &&
 166             !strncmp(end - 4, ".git", 4)) {
 167                 end -= 5;
 168                 while (repo < end && is_dir_sep(end[-1]))
 169                         end--;
 170         }
 171
 172         /*
 173          * Find last component, but be prepared that repo could have
 174          * the form  "remote.example.com:foo.git", i.e. no slash
 175          * in the directory part.
 176          */
 177         start = end;
 178         while (repo < start && !is_dir_sep(start[-1]) && start[-1] != ':')
 179                 start--;
 180
 181         /*
 182          * Strip .{bundle,git}.
 183          */
 184         if (is_bundle) {
 185                 if (end - start > 7 && !strncmp(end - 7, ".bundle", 7))
 186                         end -= 7;
 187         } else {
 188                 if (end - start > 4 && !strncmp(end - 4, ".git", 4))
 189                         end -= 4;
 190         }
 191
 192         if (is_bare) {
 193                 struct strbuf result = STRBUF_INIT;
 194                 strbuf_addf(&result, "%.*s.git", (int)(end - start), start);
 195                 dir = strbuf_detach(&result, NULL);
 196         } else
 197                 dir = xstrndup(start, end - start);
 198         /*
 199          * Replace sequences of 'control' characters and whitespace
 200          * with one ascii space, remove leading and trailing spaces.
 201          */
 202         if (*dir) {
 203                 char *out = dir;
 204                 int prev_space = 1 /* strip leading whitespace */;
 205                 for (end = dir; *end; ++end) {
 206                         char ch = *end;
 207                         if ((unsigned char)ch < '\x20')
 208                                 ch = '\x20';
 209                         if (isspace(ch)) {
 210                                 if (prev_space)
 211                                         continue;
 212                                 prev_space = 1;
 213                         } else
 214                                 prev_space = 0;
 215                         *out++ = ch;
 216                 }
 217                 *out = '\0';
 218                 if (out > dir && prev_space)
 219                         out[-1] = '\0';
 220         }
 221         return dir;
 222 }
 223
 224 static void strip_trailing_slashes(char *dir)
 225 {
 226         char *end = dir + strlen(dir);
 227
 228         while (dir < end - 1 && is_dir_sep(end[-1]))
 229                 end--;
 230         *end = '\0';
 231 }
 232
 233 static int add_one_reference(struct string_list_item *item, void *cb_data)
 234 {
 235         char *ref_git;
 236         const char *repo;
 237         struct strbuf alternate = STRBUF_INIT;
 238
 239         /* Beware: read_gitfile(), real_path() and mkpath() return static buffer */
 240         ref_git = xstrdup(real_path(item->string));
 241
 242         repo = read_gitfile(ref_git);
 243         if (!repo)
 244                 repo = read_gitfile(mkpath("%s/.git", ref_git));
 245         if (repo) {
 246                 free(ref_git);
 247                 ref_git = xstrdup(repo);
 248         }
 249
 250         if (!repo && is_directory(mkpath("%s/.git/objects", ref_git))) {
 251                 char *ref_git_git = mkpathdup("%s/.git", ref_git);
 252                 free(ref_git);
 253                 ref_git = ref_git_git;
 254         } else if (!is_directory(mkpath("%s/objects", ref_git)))
 255                 die(_("reference repository '%s' is not a local repository."),
 256                     item->string);
 257
 258         if (!access(mkpath("%s/shallow", ref_git), F_OK))
 259                 die(_("reference repository '%s' is shallow"), item->string);
 260
 261         if (!access(mkpath("%s/info/grafts", ref_git), F_OK))
 262                 die(_("reference repository '%s' is grafted"), item->string);
 263
 264         strbuf_addf(&alternate, "%s/objects", ref_git);
 265         add_to_alternates_file(alternate.buf);
 266         strbuf_release(&alternate);
 267         free(ref_git);
 268         return 0;
 269 }
 270
 271 static void setup_reference(void)
 272 {
 273         for_each_string_list(&option_reference, add_one_reference, NULL);
 274 }
 275
 276 static void copy_alternates(struct strbuf *src, struct strbuf *dst,
 277                             const char *src_repo)
 278 {
 279         /*
 280          * Read from the source objects/info/alternates file
 281          * and copy the entries to corresponding file in the
 282          * destination repository with add_to_alternates_file().
 283          * Both src and dst have "$path/objects/info/alternates".
 284          *
 285          * Instead of copying bit-for-bit from the original,
 286          * we need to append to existing one so that the already
 287          * created entry via "clone -s" is not lost, and also
 288          * to turn entries with paths relative to the original
 289          * absolute, so that they can be used in the new repository.
 290          */
 291         FILE *in = fopen(src->buf, "r");
 292         struct strbuf line = STRBUF_INIT;
 293
 294         while (strbuf_getline(&line, in, '\n') != EOF) {
 295                 char *abs_path, abs_buf[PATH_MAX];
 296                 if (!line.len || line.buf[0] == '#')
 297                         continue;
 298                 if (is_absolute_path(line.buf)) {
 299                         add_to_alternates_file(line.buf);
 300                         continue;
 301                 }
 302                 abs_path = mkpath("%s/objects/%s", src_repo, line.buf);
 303                 normalize_path_copy(abs_buf, abs_path);
 304                 add_to_alternates_file(abs_buf);
 305         }
 306         strbuf_release(&line);
 307         fclose(in);
 308 }
 309
 310 static void copy_or_link_directory(struct strbuf *src, struct strbuf *dest,
 311                                    const char *src_repo, int src_baselen)
 312 {
 313         struct dirent *de;
 314         struct stat buf;
 315         int src_len, dest_len;
 316         DIR *dir;
 317
 318         dir = opendir(src->buf);
 319         if (!dir)
 320                 die_errno(_("failed to open '%s'"), src->buf);
 321
 322         if (mkdir(dest->buf, 0777)) {
 323                 if (errno != EEXIST)
 324                         die_errno(_("failed to create directory '%s'"), dest->buf);
 325                 else if (stat(dest->buf, &buf))
 326                         die_errno(_("failed to stat '%s'"), dest->buf);
 327                 else if (!S_ISDIR(buf.st_mode))
 328                         die(_("%s exists and is not a directory"), dest->buf);
 329         }
 330
 331         strbuf_addch(src, '/');
 332         src_len = src->len;
 333         strbuf_addch(dest, '/');
 334         dest_len = dest->len;
 335
 336         while ((de = readdir(dir)) != NULL) {
 337                 strbuf_setlen(src, src_len);
 338                 strbuf_addstr(src, de->d_name);
 339                 strbuf_setlen(dest, dest_len);
 340                 strbuf_addstr(dest, de->d_name);
 341                 if (stat(src->buf, &buf)) {
 342                         warning (_("failed to stat %s\n"), src->buf);
 343                         continue;
 344                 }
 345                 if (S_ISDIR(buf.st_mode)) {
 346                         if (de->d_name[0] != '.')
 347                                 copy_or_link_directory(src, dest,
 348                                                        src_repo, src_baselen);
 349                         continue;
 350                 }
 351
 352                 /* Files that cannot be copied bit-for-bit... */
 353                 if (!strcmp(src->buf + src_baselen, "/info/alternates")) {
 354                         copy_alternates(src, dest, src_repo);
 355                         continue;
 356                 }
 357
 358                 if (unlink(dest->buf) && errno != ENOENT)
 359                         die_errno(_("failed to unlink '%s'"), dest->buf);
 360                 if (!option_no_hardlinks) {
 361                         if (!link(src->buf, dest->buf))
 362                                 continue;
 363                         if (option_local > 0)
 364                                 die_errno(_("failed to create link '%s'"), dest->buf);
 365                         option_no_hardlinks = 1;
 366                 }
 367                 if (copy_file_with_time(dest->buf, src->buf, 0666))
 368                         die_errno(_("failed to copy file to '%s'"), dest->buf);
 369         }
 370         closedir(dir);
 371 }
 372
 373 static void clone_local(const char *src_repo, const char *dest_repo)
 374 {
 375         if (option_shared) {
 376                 struct strbuf alt = STRBUF_INIT;
 377                 strbuf_addf(&alt, "%s/objects", src_repo);
 378                 add_to_alternates_file(alt.buf);
 379                 strbuf_release(&alt);
 380         } else {
 381                 struct strbuf src = STRBUF_INIT;
 382                 struct strbuf dest = STRBUF_INIT;
 383                 strbuf_addf(&src, "%s/objects", src_repo);
 384                 strbuf_addf(&dest, "%s/objects", dest_repo);
 385                 copy_or_link_directory(&src, &dest, src_repo, src.len);
 386                 strbuf_release(&src);
 387                 strbuf_release(&dest);
 388         }
 389
 390         if (0 <= option_verbosity)
 391                 fprintf(stderr, _("done.\n"));
 392 }
 393
 394 static const char *junk_work_tree;
 395 static const char *junk_git_dir;
 396 static pid_t junk_pid;
 397 static enum {
 398         JUNK_LEAVE_NONE,
 399         JUNK_LEAVE_REPO,
 400         JUNK_LEAVE_ALL
 401 } junk_mode = JUNK_LEAVE_NONE;
 402
 403 static const char junk_leave_repo_msg[] =
 404 N_("Clone succeeded, but checkout failed.\n"
 405    "You can inspect what was checked out with 'git status'\n"
 406    "and retry the checkout with 'git checkout -f HEAD'\n");
 407
 408 static void remove_junk(void)
 409 {
 410         struct strbuf sb = STRBUF_INIT;
 411
 412         switch (junk_mode) {
 413         case JUNK_LEAVE_REPO:
 414                 warning("%s", _(junk_leave_repo_msg));
 415                 /* fall-through */
 416         case JUNK_LEAVE_ALL:
 417                 return;
 418         default:
 419                 /* proceed to removal */
 420                 break;
 421         }
 422
 423         if (getpid() != junk_pid)
 424                 return;
 425         if (junk_git_dir) {
 426                 strbuf_addstr(&sb, junk_git_dir);
 427                 remove_dir_recursively(&sb, 0);
 428                 strbuf_reset(&sb);
 429         }
 430         if (junk_work_tree) {
 431                 strbuf_addstr(&sb, junk_work_tree);
 432                 remove_dir_recursively(&sb, 0);
 433                 strbuf_reset(&sb);
 434         }
 435 }
 436
 437 static void remove_junk_on_signal(int signo)
 438 {
 439         remove_junk();
 440         sigchain_pop(signo);
 441         raise(signo);
 442 }
 443
 444 static struct ref *find_remote_branch(const struct ref *refs, const char *branch)
 445 {
 446         struct ref *ref;
 447         struct strbuf head = STRBUF_INIT;
 448         strbuf_addstr(&head, "refs/heads/");
 449         strbuf_addstr(&head, branch);
 450         ref = find_ref_by_name(refs, head.buf);
 451         strbuf_release(&head);
 452
 453         if (ref)
 454                 return ref;
 455
 456         strbuf_addstr(&head, "refs/tags/");
 457         strbuf_addstr(&head, branch);
 458         ref = find_ref_by_name(refs, head.buf);
 459         strbuf_release(&head);
 460
 461         return ref;
 462 }
 463
 464 static struct ref *wanted_peer_refs(const struct ref *refs,
 465                 struct refspec *refspec)
 466 {
 467         struct ref *head = copy_ref(find_ref_by_name(refs, "HEAD"));
 468         struct ref *local_refs = head;
 469         struct ref **tail = head ? &head->next : &local_refs;
 470
 471         if (option_single_branch) {
 472                 struct ref *remote_head = NULL;
 473
 474                 if (!option_branch)
 475                         remote_head = guess_remote_head(head, refs, 0);
 476                 else {
 477                         local_refs = NULL;
 478                         tail = &local_refs;
 479                         remote_head = copy_ref(find_remote_branch(refs, option_branch));
 480                 }
 481
 482                 if (!remote_head && option_branch)
 483                         warning(_("Could not find remote branch %s to clone."),
 484                                 option_branch);
 485                 else {
 486                         get_fetch_map(remote_head, refspec, &tail, 0);
 487
 488                         /* if --branch=tag, pull the requested tag explicitly */
 489                         get_fetch_map(remote_head, tag_refspec, &tail, 0);
 490                 }
 491         } else
 492                 get_fetch_map(refs, refspec, &tail, 0);
 493
 494         if (!option_mirror && !option_single_branch)
 495                 get_fetch_map(refs, tag_refspec, &tail, 0);
 496
 497         return local_refs;
 498 }
 499
 500 static void write_remote_refs(const struct ref *local_refs)
 501 {
 502         const struct ref *r;
 503
 504         lock_packed_refs(LOCK_DIE_ON_ERROR);
 505
 506         for (r = local_refs; r; r = r->next) {
 507                 if (!r->peer_ref)
 508                         continue;
 509                 add_packed_ref(r->peer_ref->name, r->old_sha1);
 510         }
 511
 512         if (commit_packed_refs())
 513                 die_errno("unable to overwrite old ref-pack file");
 514 }
 515
 516 static void write_followtags(const struct ref *refs, const char *msg)
 517 {
 518         const struct ref *ref;
 519         for (ref = refs; ref; ref = ref->next) {
 520                 if (!starts_with(ref->name, "refs/tags/"))
 521                         continue;
 522                 if (ends_with(ref->name, "^{}"))
 523                         continue;
 524                 if (!has_sha1_file(ref->old_sha1))
 525                         continue;
 526                 update_ref(msg, ref->name, ref->old_sha1,
 527                            NULL, 0, UPDATE_REFS_DIE_ON_ERR);
 528         }
 529 }
 530
 531 static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
 532 {
 533         struct ref **rm = cb_data;
 534         struct ref *ref = *rm;
 535
 536         /*
 537          * Skip anything missing a peer_ref, which we are not
 538          * actually going to write a ref for.
 539          */
 540         while (ref && !ref->peer_ref)
 541                 ref = ref->next;
 542         /* Returning -1 notes "end of list" to the caller. */
 543         if (!ref)
 544                 return -1;
 545
 546         hashcpy(sha1, ref->old_sha1);
 547         *rm = ref->next;
 548         return 0;
 549 }
 550
 551 static void update_remote_refs(const struct ref *refs,
 552                                const struct ref *mapped_refs,
 553                                const struct ref *remote_head_points_at,
 554                                const char *branch_top,
 555                                const char *msg,
 556                                struct transport *transport,
 557                                int check_connectivity)
 558 {
 559         const struct ref *rm = mapped_refs;
 560
 561         if (check_connectivity) {
 562                 if (transport->progress)
 563                         fprintf(stderr, _("Checking connectivity... "));
 564                 if (check_everything_connected_with_transport(iterate_ref_map,
 565                                                               0, &rm, transport))
 566                         die(_("remote did not send all necessary objects"));
 567                 if (transport->progress)
 568                         fprintf(stderr, _("done.\n"));
 569         }
 570
 571         if (refs) {
 572                 write_remote_refs(mapped_refs);
 573                 if (option_single_branch)
 574                         write_followtags(refs, msg);
 575         }
 576
 577         if (remote_head_points_at && !option_bare) {
 578                 struct strbuf head_ref = STRBUF_INIT;
 579                 strbuf_addstr(&head_ref, branch_top);
 580                 strbuf_addstr(&head_ref, "HEAD");
 581                 create_symref(head_ref.buf,
 582                               remote_head_points_at->peer_ref->name,
 583                               msg);
 584         }
 585 }
 586
 587 static void update_head(const struct ref *our, const struct ref *remote,
 588                         const char *msg)
 589 {
 590         const char *head;
 591         if (our && skip_prefix(our->name, "refs/heads/", &head)) {
 592                 /* Local default branch link */
 593                 create_symref("HEAD", our->name, NULL);
 594                 if (!option_bare) {
 595                         update_ref(msg, "HEAD", our->old_sha1, NULL, 0,
 596                                    UPDATE_REFS_DIE_ON_ERR);
 597                         install_branch_config(0, head, option_origin, our->name);
 598                 }
 599         } else if (our) {
 600                 struct commit *c = lookup_commit_reference(our->old_sha1);
 601                 /* --branch specifies a non-branch (i.e. tags), detach HEAD */
 602                 update_ref(msg, "HEAD", c->object.sha1,
 603                            NULL, REF_NODEREF, UPDATE_REFS_DIE_ON_ERR);
 604         } else if (remote) {
 605                 /*
 606                  * We know remote HEAD points to a non-branch, or
 607                  * HEAD points to a branch but we don't know which one.
 608                  * Detach HEAD in all these cases.
 609                  */
 610                 update_ref(msg, "HEAD", remote->old_sha1,
 611                            NULL, REF_NODEREF, UPDATE_REFS_DIE_ON_ERR);
 612         }
 613 }
 614
 615 static int checkout(void)
 616 {
 617         unsigned char sha1[20];
 618         char *head;
 619         struct lock_file *lock_file;
 620         struct unpack_trees_options opts;
 621         struct tree *tree;
 622         struct tree_desc t;
 623         int err = 0;
 624
 625         if (option_no_checkout)
 626                 return 0;
 627
 628         head = resolve_refdup("HEAD", sha1, 1, NULL);
 629         if (!head) {
 630                 warning(_("remote HEAD refers to nonexistent ref, "
 631                           "unable to checkout.\n"));
 632                 return 0;
 633         }
 634         if (!strcmp(head, "HEAD")) {
 635                 if (advice_detached_head)
 636                         detach_advice(sha1_to_hex(sha1));
 637         } else {
 638                 if (!starts_with(head, "refs/heads/"))
 639                         die(_("HEAD not found below refs/heads!"));
 640         }
 641         free(head);
 642
 643         /* We need to be in the new work tree for the checkout */
 644         setup_work_tree();
 645
 646         lock_file = xcalloc(1, sizeof(struct lock_file));
 647         hold_locked_index(lock_file, 1);
 648
 649         memset(&opts, 0, sizeof opts);
 650         opts.update = 1;
 651         opts.merge = 1;
 652         opts.fn = oneway_merge;
 653         opts.verbose_update = (option_verbosity >= 0);
 654         opts.src_index = &the_index;
 655         opts.dst_index = &the_index;
 656
 657         tree = parse_tree_indirect(sha1);
 658         parse_tree(tree);
 659         init_tree_desc(&t, tree->buffer, tree->size);
 660         if (unpack_trees(1, &t, &opts) < 0)
 661                 die(_("unable to checkout working tree"));
 662
 663         if (write_locked_index(&the_index, lock_file, COMMIT_LOCK))
 664                 die(_("unable to write new index file"));
 665
 666         err |= run_hook_le(NULL, "post-checkout", sha1_to_hex(null_sha1),
 667                            sha1_to_hex(sha1), "1", NULL);
 668
 669         if (!err && option_recursive)
 670                 err = run_command_v_opt(argv_submodule, RUN_GIT_CMD);
 671
 672         return err;
 673 }
 674
 675 static int write_one_config(const char *key, const char *value, void *data)
 676 {
 677         return git_config_set_multivar(key, value ? value : "true", "^$", 0);
 678 }
 679
 680 static void write_config(struct string_list *config)
 681 {
 682         int i;
 683
 684         for (i = 0; i < config->nr; i++) {
 685                 if (git_config_parse_parameter(config->items[i].string,
 686                                                write_one_config, NULL) < 0)
 687                         die("unable to write parameters to config file");
 688         }
 689 }
 690
 691 static void write_refspec_config(const char* src_ref_prefix,
 692                 const struct ref* our_head_points_at,
 693                 const struct ref* remote_head_points_at, struct strbuf* branch_top)
 694 {
 695         struct strbuf key = STRBUF_INIT;
 696         struct strbuf value = STRBUF_INIT;
 697
 698         if (option_mirror || !option_bare) {
 699                 if (option_single_branch && !option_mirror) {
 700                         if (option_branch) {
 701                                 if (starts_with(our_head_points_at->name, "refs/tags/"))
 702                                         strbuf_addf(&value, "+%s:%s", our_head_points_at->name,
 703                                                 our_head_points_at->name);
 704                                 else
 705                                         strbuf_addf(&value, "+%s:%s%s", our_head_points_at->name,
 706                                                 branch_top->buf, option_branch);
 707                         } else if (remote_head_points_at) {
 708                                 const char *head = remote_head_points_at->name;
 709                                 if (!skip_prefix(head, "refs/heads/", &head))
 710                                         die("BUG: remote HEAD points at non-head?");
 711
 712                                 strbuf_addf(&value, "+%s:%s%s", remote_head_points_at->name,
 713                                                 branch_top->buf, head);
 714                         }
 715                         /*
 716                          * otherwise, the next "git fetch" will
 717                          * simply fetch from HEAD without updating
 718                          * any remote-tracking branch, which is what
 719                          * we want.
 720                          */
 721                 } else {
 722                         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top->buf);
 723                 }
 724                 /* Configure the remote */
 725                 if (value.len) {
 726                         strbuf_addf(&key, "remote.%s.fetch", option_origin);
 727                         git_config_set_multivar(key.buf, value.buf, "^$", 0);
 728                         strbuf_reset(&key);
 729
 730                         if (option_mirror) {
 731                                 strbuf_addf(&key, "remote.%s.mirror", option_origin);
 732                                 git_config_set(key.buf, "true");
 733                                 strbuf_reset(&key);
 734                         }
 735                 }
 736         }
 737
 738         strbuf_release(&key);
 739         strbuf_release(&value);
 740 }
 741
 742 static void dissociate_from_references(void)
 743 {
 744         static const char* argv[] = { "repack", "-a", "-d", NULL };
 745
 746         if (run_command_v_opt(argv, RUN_GIT_CMD|RUN_COMMAND_NO_STDIN))
 747                 die(_("cannot repack to clean up"));
 748         if (unlink(git_path("objects/info/alternates")) && errno != ENOENT)
 749                 die_errno(_("cannot unlink temporary alternates file"));
 750 }
 751
 752 int cmd_clone(int argc, const char **argv, const char *prefix)
 753 {
 754         int is_bundle = 0, is_local;
 755         struct stat buf;
 756         const char *repo_name, *repo, *work_tree, *git_dir;
 757         char *path, *dir;
 758         int dest_exists;
 759         const struct ref *refs, *remote_head;
 760         const struct ref *remote_head_points_at;
 761         const struct ref *our_head_points_at;
 762         struct ref *mapped_refs;
 763         const struct ref *ref;
 764         struct strbuf key = STRBUF_INIT, value = STRBUF_INIT;
 765         struct strbuf branch_top = STRBUF_INIT, reflog_msg = STRBUF_INIT;
 766         struct transport *transport = NULL;
 767         const char *src_ref_prefix = "refs/heads/";
 768         struct remote *remote;
 769         int err = 0, complete_refs_before_fetch = 1;
 770
 771         struct refspec *refspec;
 772         const char *fetch_pattern;
 773
 774         junk_pid = getpid();
 775
 776         packet_trace_identity("clone");
 777         argc = parse_options(argc, argv, prefix, builtin_clone_options,
 778                              builtin_clone_usage, 0);
 779
 780         if (argc > 2)
 781                 usage_msg_opt(_("Too many arguments."),
 782                         builtin_clone_usage, builtin_clone_options);
 783
 784         if (argc == 0)
 785                 usage_msg_opt(_("You must specify a repository to clone."),
 786                         builtin_clone_usage, builtin_clone_options);
 787
 788         if (option_single_branch == -1)
 789                 option_single_branch = option_depth ? 1 : 0;
 790
 791         if (option_mirror)
 792                 option_bare = 1;
 793
 794         if (option_bare) {
 795                 if (option_origin)
 796                         die(_("--bare and --origin %s options are incompatible."),
 797                             option_origin);
 798                 if (real_git_dir)
 799                         die(_("--bare and --separate-git-dir are incompatible."));
 800                 option_no_checkout = 1;
 801         }
 802
 803         if (!option_origin)
 804                 option_origin = "origin";
 805
 806         repo_name = argv[0];
 807
 808         path = get_repo_path(repo_name, &is_bundle);
 809         if (path)
 810                 repo = xstrdup(absolute_path(repo_name));
 811         else if (!strchr(repo_name, ':'))
 812                 die(_("repository '%s' does not exist"), repo_name);
 813         else
 814                 repo = repo_name;
 815
 816         /* no need to be strict, transport_set_option() will validate it again */
 817         if (option_depth && atoi(option_depth) < 1)
 818                 die(_("depth %s is not a positive number"), option_depth);
 819
 820         if (argc == 2)
 821                 dir = xstrdup(argv[1]);
 822         else
 823                 dir = guess_dir_name(repo_name, is_bundle, option_bare);
 824         strip_trailing_slashes(dir);
 825
 826         dest_exists = !stat(dir, &buf);
 827         if (dest_exists && !is_empty_dir(dir))
 828                 die(_("destination path '%s' already exists and is not "
 829                         "an empty directory."), dir);
 830
 831         strbuf_addf(&reflog_msg, "clone: from %s", repo);
 832
 833         if (option_bare)
 834                 work_tree = NULL;
 835         else {
 836                 work_tree = getenv("GIT_WORK_TREE");
 837                 if (work_tree && !stat(work_tree, &buf))
 838                         die(_("working tree '%s' already exists."), work_tree);
 839         }
 840
 841         if (option_bare || work_tree)
 842                 git_dir = xstrdup(dir);
 843         else {
 844                 work_tree = dir;
 845                 git_dir = mkpathdup("%s/.git", dir);
 846         }
 847
 848         if (!option_bare) {
 849                 junk_work_tree = work_tree;
 850                 if (safe_create_leading_directories_const(work_tree) < 0)
 851                         die_errno(_("could not create leading directories of '%s'"),
 852                                   work_tree);
 853                 if (!dest_exists && mkdir(work_tree, 0777))
 854                         die_errno(_("could not create work tree dir '%s'."),
 855                                   work_tree);
 856                 set_git_work_tree(work_tree);
 857         }
 858         junk_git_dir = git_dir;
 859         atexit(remove_junk);
 860         sigchain_push_common(remove_junk_on_signal);
 861
 862         if (safe_create_leading_directories_const(git_dir) < 0)
 863                 die(_("could not create leading directories of '%s'"), git_dir);
 864
 865         set_git_dir_init(git_dir, real_git_dir, 0);
 866         if (real_git_dir) {
 867                 git_dir = real_git_dir;
 868                 junk_git_dir = real_git_dir;
 869         }
 870
 871         if (0 <= option_verbosity) {
 872                 if (option_bare)
 873                         fprintf(stderr, _("Cloning into bare repository '%s'...\n"), dir);
 874                 else
 875                         fprintf(stderr, _("Cloning into '%s'...\n"), dir);
 876         }
 877         init_db(option_template, INIT_DB_QUIET);
 878         write_config(&option_config);
 879
 880         git_config(git_default_config, NULL);
 881
 882         if (option_bare) {
 883                 if (option_mirror)
 884                         src_ref_prefix = "refs/";
 885                 strbuf_addstr(&branch_top, src_ref_prefix);
 886
 887                 git_config_set("core.bare", "true");
 888         } else {
 889                 strbuf_addf(&branch_top, "refs/remotes/%s/", option_origin);
 890         }
 891
 892         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top.buf);
 893         strbuf_addf(&key, "remote.%s.url", option_origin);
 894         git_config_set(key.buf, repo);
 895         strbuf_reset(&key);
 896
 897         if (option_reference.nr)
 898                 setup_reference();
 899         else if (option_dissociate) {
 900                 warning(_("--dissociate given, but there is no --reference"));
 901                 option_dissociate = 0;
 902         }
 903
 904         fetch_pattern = value.buf;
 905         refspec = parse_fetch_refspec(1, &fetch_pattern);
 906
 907         strbuf_reset(&value);
 908
 909         remote = remote_get(option_origin);
 910         transport = transport_get(remote, remote->url[0]);
 911         path = get_repo_path(remote->url[0], &is_bundle);
 912         is_local = option_local != 0 && path && !is_bundle;
 913         if (is_local) {
 914                 if (option_depth)
 915                         warning(_("--depth is ignored in local clones; use file:// instead."));
 916                 if (!access(mkpath("%s/shallow", path), F_OK)) {
 917                         if (option_local > 0)
 918                                 warning(_("source repository is shallow, ignoring --local"));
 919                         is_local = 0;
 920                 }
 921         }
 922         if (option_local > 0 && !is_local)
 923                 warning(_("--local is ignored"));
 924         transport->cloning = 1;
 925
 926         if (!transport->get_refs_list || (!is_local && !transport->fetch))
 927                 die(_("Don't know how to clone %s"), transport->url);
 928
 929         transport_set_option(transport, TRANS_OPT_KEEP, "yes");
 930
 931         if (option_depth)
 932                 transport_set_option(transport, TRANS_OPT_DEPTH,
 933                                      option_depth);
 934         if (option_single_branch)
 935                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
 936
 937         transport_set_verbosity(transport, option_verbosity, option_progress);
 938
 939         if (option_upload_pack)
 940                 transport_set_option(transport, TRANS_OPT_UPLOADPACK,
 941                                      option_upload_pack);
 942
 943         if (transport->smart_options && !option_depth)
 944                 transport->smart_options->check_self_contained_and_connected = 1;
 945
 946         refs = transport_get_remote_refs(transport);
 947
 948         if (refs) {
 949                 mapped_refs = wanted_peer_refs(refs, refspec);
 950                 /*
 951                  * transport_get_remote_refs() may return refs with null sha-1
 952                  * in mapped_refs (see struct transport->get_refs_list
 953                  * comment). In that case we need fetch it early because
 954                  * remote_head code below relies on it.
 955                  *
 956                  * for normal clones, transport_get_remote_refs() should
 957                  * return reliable ref set, we can delay cloning until after
 958                  * remote HEAD check.
 959                  */
 960                 for (ref = refs; ref; ref = ref->next)
 961                         if (is_null_sha1(ref->old_sha1)) {
 962                                 complete_refs_before_fetch = 0;
 963                                 break;
 964                         }
 965
 966                 if (!is_local && !complete_refs_before_fetch)
 967                         transport_fetch_refs(transport, mapped_refs);
 968
 969                 remote_head = find_ref_by_name(refs, "HEAD");
 970                 remote_head_points_at =
 971                         guess_remote_head(remote_head, mapped_refs, 0);
 972
 973                 if (option_branch) {
 974                         our_head_points_at =
 975                                 find_remote_branch(mapped_refs, option_branch);
 976
 977                         if (!our_head_points_at)
 978                                 die(_("Remote branch %s not found in upstream %s"),
 979                                     option_branch, option_origin);
 980                 }
 981                 else
 982                         our_head_points_at = remote_head_points_at;
 983         }
 984         else {
 985                 if (option_branch)
 986                         die(_("Remote branch %s not found in upstream %s"),
 987                                         option_branch, option_origin);
 988
 989                 warning(_("You appear to have cloned an empty repository."));
 990                 mapped_refs = NULL;
 991                 our_head_points_at = NULL;
 992                 remote_head_points_at = NULL;
 993                 remote_head = NULL;
 994                 option_no_checkout = 1;
 995                 if (!option_bare)
 996                         install_branch_config(0, "master", option_origin,
 997                                               "refs/heads/master");
 998         }
 999
1000         write_refspec_config(src_ref_prefix, our_head_points_at,
1001                         remote_head_points_at, &branch_top);
1002
1003         if (is_local)
1004                 clone_local(path, git_dir);
1005         else if (refs && complete_refs_before_fetch)
1006                 transport_fetch_refs(transport, mapped_refs);
1007
1008         update_remote_refs(refs, mapped_refs, remote_head_points_at,
1009                            branch_top.buf, reflog_msg.buf, transport, !is_local);
1010
1011         update_head(our_head_points_at, remote_head, reflog_msg.buf);
1012
1013         transport_unlock_pack(transport);
1014         transport_disconnect(transport);
1015
1016         if (option_dissociate)
1017                 dissociate_from_references();
1018
1019         junk_mode = JUNK_LEAVE_REPO;
1020         err = checkout();
1021
1022         strbuf_release(&reflog_msg);
1023         strbuf_release(&branch_top);
1024         strbuf_release(&key);
1025         strbuf_release(&value);
1026         junk_mode = JUNK_LEAVE_ALL;
1027         return err;
1028 }