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 "pack-refs.h"
  22 #include "sigchain.h"
  23 #include "branch.h"
  24 #include "remote.h"
  25 #include "run-command.h"
  26 #include "connected.h"
  27
  28 /*
  29  * Overall FIXMEs:
  30  *  - respect DB_ENVIRONMENT for .git/objects.
  31  *
  32  * Implementation notes:
  33  *  - dropping use-separate-remote and no-separate-remote compatibility
  34  *
  35  */
  36 static const char * const builtin_clone_usage[] = {
  37         N_("git clone [options] [--] <repo> [<dir>]"),
  38         NULL
  39 };
  40
  41 static int option_no_checkout, option_bare, option_mirror, option_single_branch = -1;
  42 static int option_local = -1, option_no_hardlinks, option_shared, option_recursive;
  43 static char *option_template, *option_depth;
  44 static char *option_origin = NULL;
  45 static char *option_branch = NULL;
  46 static const char *real_git_dir;
  47 static char *option_upload_pack = "git-upload-pack";
  48 static int option_verbosity;
  49 static int option_progress = -1;
  50 static struct string_list option_config;
  51 static struct string_list option_reference;
  52
  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_BOOLEAN('n', "no-checkout", &option_no_checkout,
  67                     N_("don't create a checkout")),
  68         OPT_BOOLEAN(0, "bare", &option_bare, N_("create a bare repository")),
  69         { OPTION_BOOLEAN, 0, "naked", &option_bare, NULL,
  70                 N_("create a bare repository"),
  71                 PARSE_OPT_NOARG | PARSE_OPT_HIDDEN },
  72         OPT_BOOLEAN(0, "mirror", &option_mirror,
  73                     N_("create a mirror repository (implies bare)")),
  74         OPT_BOOL('l', "local", &option_local,
  75                 N_("to clone from a local repository")),
  76         OPT_BOOLEAN(0, "no-hardlinks", &option_no_hardlinks,
  77                     N_("don't use local hardlinks, always copy")),
  78         OPT_BOOLEAN('s', "shared", &option_shared,
  79                     N_("setup as shared repository")),
  80         OPT_BOOLEAN(0, "recursive", &option_recursive,
  81                     N_("initialize submodules in the clone")),
  82         OPT_BOOLEAN(0, "recurse-submodules", &option_recursive,
  83                     N_("initialize submodules in the clone")),
  84         OPT_STRING(0, "template", &option_template, N_("template-directory"),
  85                    N_("directory from which templates will be used")),
  86         OPT_CALLBACK(0 , "reference", &option_reference, N_("repo"),
  87                      N_("reference repository"), &opt_parse_reference),
  88         OPT_STRING('o', "origin", &option_origin, N_("name"),
  89                    N_("use <name> instead of 'origin' to track upstream")),
  90         OPT_STRING('b', "branch", &option_branch, N_("branch"),
  91                    N_("checkout <branch> instead of the remote's HEAD")),
  92         OPT_STRING('u', "upload-pack", &option_upload_pack, N_("path"),
  93                    N_("path to git-upload-pack on the remote")),
  94         OPT_STRING(0, "depth", &option_depth, N_("depth"),
  95                     N_("create a shallow clone of that depth")),
  96         OPT_BOOL(0, "single-branch", &option_single_branch,
  97                     N_("clone only one branch, HEAD or --branch")),
  98         OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
  99                    N_("separate git dir from working tree")),
 100         OPT_STRING_LIST('c', "config", &option_config, N_("key=value"),
 101                         N_("set config inside the new repository")),
 102         OPT_END()
 103 };
 104
 105 static const char *argv_submodule[] = {
 106         "submodule", "update", "--init", "--recursive", NULL
 107 };
 108
 109 static char *get_repo_path(const char *repo, int *is_bundle)
 110 {
 111         static char *suffix[] = { "/.git", "", ".git/.git", ".git" };
 112         static char *bundle_suffix[] = { ".bundle", "" };
 113         struct stat st;
 114         int i;
 115
 116         for (i = 0; i < ARRAY_SIZE(suffix); i++) {
 117                 const char *path;
 118                 path = mkpath("%s%s", repo, suffix[i]);
 119                 if (stat(path, &st))
 120                         continue;
 121                 if (S_ISDIR(st.st_mode) && is_git_directory(path)) {
 122                         *is_bundle = 0;
 123                         return xstrdup(absolute_path(path));
 124                 } else if (S_ISREG(st.st_mode) && st.st_size > 8) {
 125                         /* Is it a "gitfile"? */
 126                         char signature[8];
 127                         int len, fd = open(path, O_RDONLY);
 128                         if (fd < 0)
 129                                 continue;
 130                         len = read_in_full(fd, signature, 8);
 131                         close(fd);
 132                         if (len != 8 || strncmp(signature, "gitdir: ", 8))
 133                                 continue;
 134                         path = read_gitfile(path);
 135                         if (path) {
 136                                 *is_bundle = 0;
 137                                 return xstrdup(absolute_path(path));
 138                         }
 139                 }
 140         }
 141
 142         for (i = 0; i < ARRAY_SIZE(bundle_suffix); i++) {
 143                 const char *path;
 144                 path = mkpath("%s%s", repo, bundle_suffix[i]);
 145                 if (!stat(path, &st) && S_ISREG(st.st_mode)) {
 146                         *is_bundle = 1;
 147                         return xstrdup(absolute_path(path));
 148                 }
 149         }
 150
 151         return NULL;
 152 }
 153
 154 static char *guess_dir_name(const char *repo, int is_bundle, int is_bare)
 155 {
 156         const char *end = repo + strlen(repo), *start;
 157         char *dir;
 158
 159         /*
 160          * Strip trailing spaces, slashes and /.git
 161          */
 162         while (repo < end && (is_dir_sep(end[-1]) || isspace(end[-1])))
 163                 end--;
 164         if (end - repo > 5 && is_dir_sep(end[-5]) &&
 165             !strncmp(end - 4, ".git", 4)) {
 166                 end -= 5;
 167                 while (repo < end && is_dir_sep(end[-1]))
 168                         end--;
 169         }
 170
 171         /*
 172          * Find last component, but be prepared that repo could have
 173          * the form  "remote.example.com:foo.git", i.e. no slash
 174          * in the directory part.
 175          */
 176         start = end;
 177         while (repo < start && !is_dir_sep(start[-1]) && start[-1] != ':')
 178                 start--;
 179
 180         /*
 181          * Strip .{bundle,git}.
 182          */
 183         if (is_bundle) {
 184                 if (end - start > 7 && !strncmp(end - 7, ".bundle", 7))
 185                         end -= 7;
 186         } else {
 187                 if (end - start > 4 && !strncmp(end - 4, ".git", 4))
 188                         end -= 4;
 189         }
 190
 191         if (is_bare) {
 192                 struct strbuf result = STRBUF_INIT;
 193                 strbuf_addf(&result, "%.*s.git", (int)(end - start), start);
 194                 dir = strbuf_detach(&result, NULL);
 195         } else
 196                 dir = xstrndup(start, end - start);
 197         /*
 198          * Replace sequences of 'control' characters and whitespace
 199          * with one ascii space, remove leading and trailing spaces.
 200          */
 201         if (*dir) {
 202                 char *out = dir;
 203                 int prev_space = 1 /* strip leading whitespace */;
 204                 for (end = dir; *end; ++end) {
 205                         char ch = *end;
 206                         if ((unsigned char)ch < '\x20')
 207                                 ch = '\x20';
 208                         if (isspace(ch)) {
 209                                 if (prev_space)
 210                                         continue;
 211                                 prev_space = 1;
 212                         } else
 213                                 prev_space = 0;
 214                         *out++ = ch;
 215                 }
 216                 *out = '\0';
 217                 if (out > dir && prev_space)
 218                         out[-1] = '\0';
 219         }
 220         return dir;
 221 }
 222
 223 static void strip_trailing_slashes(char *dir)
 224 {
 225         char *end = dir + strlen(dir);
 226
 227         while (dir < end - 1 && is_dir_sep(end[-1]))
 228                 end--;
 229         *end = '\0';
 230 }
 231
 232 static int add_one_reference(struct string_list_item *item, void *cb_data)
 233 {
 234         char *ref_git;
 235         const char *repo;
 236         struct strbuf alternate = STRBUF_INIT;
 237
 238         /* Beware: read_gitfile(), real_path() and mkpath() return static buffer */
 239         ref_git = xstrdup(real_path(item->string));
 240
 241         repo = read_gitfile(ref_git);
 242         if (!repo)
 243                 repo = read_gitfile(mkpath("%s/.git", ref_git));
 244         if (repo) {
 245                 free(ref_git);
 246                 ref_git = xstrdup(repo);
 247         }
 248
 249         if (!repo && is_directory(mkpath("%s/.git/objects", ref_git))) {
 250                 char *ref_git_git = mkpathdup("%s/.git", ref_git);
 251                 free(ref_git);
 252                 ref_git = ref_git_git;
 253         } else if (!is_directory(mkpath("%s/objects", ref_git)))
 254                 die(_("reference repository '%s' is not a local repository."),
 255                     item->string);
 256
 257         strbuf_addf(&alternate, "%s/objects", ref_git);
 258         add_to_alternates_file(alternate.buf);
 259         strbuf_release(&alternate);
 260         free(ref_git);
 261         return 0;
 262 }
 263
 264 static void setup_reference(void)
 265 {
 266         for_each_string_list(&option_reference, add_one_reference, NULL);
 267 }
 268
 269 static void copy_alternates(struct strbuf *src, struct strbuf *dst,
 270                             const char *src_repo)
 271 {
 272         /*
 273          * Read from the source objects/info/alternates file
 274          * and copy the entries to corresponding file in the
 275          * destination repository with add_to_alternates_file().
 276          * Both src and dst have "$path/objects/info/alternates".
 277          *
 278          * Instead of copying bit-for-bit from the original,
 279          * we need to append to existing one so that the already
 280          * created entry via "clone -s" is not lost, and also
 281          * to turn entries with paths relative to the original
 282          * absolute, so that they can be used in the new repository.
 283          */
 284         FILE *in = fopen(src->buf, "r");
 285         struct strbuf line = STRBUF_INIT;
 286
 287         while (strbuf_getline(&line, in, '\n') != EOF) {
 288                 char *abs_path, abs_buf[PATH_MAX];
 289                 if (!line.len || line.buf[0] == '#')
 290                         continue;
 291                 if (is_absolute_path(line.buf)) {
 292                         add_to_alternates_file(line.buf);
 293                         continue;
 294                 }
 295                 abs_path = mkpath("%s/objects/%s", src_repo, line.buf);
 296                 normalize_path_copy(abs_buf, abs_path);
 297                 add_to_alternates_file(abs_buf);
 298         }
 299         strbuf_release(&line);
 300         fclose(in);
 301 }
 302
 303 static void copy_or_link_directory(struct strbuf *src, struct strbuf *dest,
 304                                    const char *src_repo, int src_baselen)
 305 {
 306         struct dirent *de;
 307         struct stat buf;
 308         int src_len, dest_len;
 309         DIR *dir;
 310
 311         dir = opendir(src->buf);
 312         if (!dir)
 313                 die_errno(_("failed to open '%s'"), src->buf);
 314
 315         if (mkdir(dest->buf, 0777)) {
 316                 if (errno != EEXIST)
 317                         die_errno(_("failed to create directory '%s'"), dest->buf);
 318                 else if (stat(dest->buf, &buf))
 319                         die_errno(_("failed to stat '%s'"), dest->buf);
 320                 else if (!S_ISDIR(buf.st_mode))
 321                         die(_("%s exists and is not a directory"), dest->buf);
 322         }
 323
 324         strbuf_addch(src, '/');
 325         src_len = src->len;
 326         strbuf_addch(dest, '/');
 327         dest_len = dest->len;
 328
 329         while ((de = readdir(dir)) != NULL) {
 330                 strbuf_setlen(src, src_len);
 331                 strbuf_addstr(src, de->d_name);
 332                 strbuf_setlen(dest, dest_len);
 333                 strbuf_addstr(dest, de->d_name);
 334                 if (stat(src->buf, &buf)) {
 335                         warning (_("failed to stat %s\n"), src->buf);
 336                         continue;
 337                 }
 338                 if (S_ISDIR(buf.st_mode)) {
 339                         if (de->d_name[0] != '.')
 340                                 copy_or_link_directory(src, dest,
 341                                                        src_repo, src_baselen);
 342                         continue;
 343                 }
 344
 345                 /* Files that cannot be copied bit-for-bit... */
 346                 if (!strcmp(src->buf + src_baselen, "/info/alternates")) {
 347                         copy_alternates(src, dest, src_repo);
 348                         continue;
 349                 }
 350
 351                 if (unlink(dest->buf) && errno != ENOENT)
 352                         die_errno(_("failed to unlink '%s'"), dest->buf);
 353                 if (!option_no_hardlinks) {
 354                         if (!link(src->buf, dest->buf))
 355                                 continue;
 356                         if (option_local > 0)
 357                                 die_errno(_("failed to create link '%s'"), dest->buf);
 358                         option_no_hardlinks = 1;
 359                 }
 360                 if (copy_file_with_time(dest->buf, src->buf, 0666))
 361                         die_errno(_("failed to copy file to '%s'"), dest->buf);
 362         }
 363         closedir(dir);
 364 }
 365
 366 static void clone_local(const char *src_repo, const char *dest_repo)
 367 {
 368         if (option_shared) {
 369                 struct strbuf alt = STRBUF_INIT;
 370                 strbuf_addf(&alt, "%s/objects", src_repo);
 371                 add_to_alternates_file(alt.buf);
 372                 strbuf_release(&alt);
 373         } else {
 374                 struct strbuf src = STRBUF_INIT;
 375                 struct strbuf dest = STRBUF_INIT;
 376                 strbuf_addf(&src, "%s/objects", src_repo);
 377                 strbuf_addf(&dest, "%s/objects", dest_repo);
 378                 copy_or_link_directory(&src, &dest, src_repo, src.len);
 379                 strbuf_release(&src);
 380                 strbuf_release(&dest);
 381         }
 382
 383         if (0 <= option_verbosity)
 384                 printf(_("done.\n"));
 385 }
 386
 387 static const char *junk_work_tree;
 388 static const char *junk_git_dir;
 389 static pid_t junk_pid;
 390 static enum {
 391         JUNK_LEAVE_NONE,
 392         JUNK_LEAVE_REPO,
 393         JUNK_LEAVE_ALL
 394 } junk_mode = JUNK_LEAVE_NONE;
 395
 396 static const char junk_leave_repo_msg[] =
 397 N_("Clone succeeded, but checkout failed.\n"
 398    "You can inspect what was checked out with 'git status'\n"
 399    "and retry the checkout with 'git checkout -f HEAD'\n");
 400
 401 static void remove_junk(void)
 402 {
 403         struct strbuf sb = STRBUF_INIT;
 404
 405         switch (junk_mode) {
 406         case JUNK_LEAVE_REPO:
 407                 warning("%s", _(junk_leave_repo_msg));
 408                 /* fall-through */
 409         case JUNK_LEAVE_ALL:
 410                 return;
 411         default:
 412                 /* proceed to removal */
 413                 break;
 414         }
 415
 416         if (getpid() != junk_pid)
 417                 return;
 418         if (junk_git_dir) {
 419                 strbuf_addstr(&sb, junk_git_dir);
 420                 remove_dir_recursively(&sb, 0);
 421                 strbuf_reset(&sb);
 422         }
 423         if (junk_work_tree) {
 424                 strbuf_addstr(&sb, junk_work_tree);
 425                 remove_dir_recursively(&sb, 0);
 426                 strbuf_reset(&sb);
 427         }
 428 }
 429
 430 static void remove_junk_on_signal(int signo)
 431 {
 432         remove_junk();
 433         sigchain_pop(signo);
 434         raise(signo);
 435 }
 436
 437 static struct ref *find_remote_branch(const struct ref *refs, const char *branch)
 438 {
 439         struct ref *ref;
 440         struct strbuf head = STRBUF_INIT;
 441         strbuf_addstr(&head, "refs/heads/");
 442         strbuf_addstr(&head, branch);
 443         ref = find_ref_by_name(refs, head.buf);
 444         strbuf_release(&head);
 445
 446         if (ref)
 447                 return ref;
 448
 449         strbuf_addstr(&head, "refs/tags/");
 450         strbuf_addstr(&head, branch);
 451         ref = find_ref_by_name(refs, head.buf);
 452         strbuf_release(&head);
 453
 454         return ref;
 455 }
 456
 457 static struct ref *wanted_peer_refs(const struct ref *refs,
 458                 struct refspec *refspec)
 459 {
 460         struct ref *head = copy_ref(find_ref_by_name(refs, "HEAD"));
 461         struct ref *local_refs = head;
 462         struct ref **tail = head ? &head->next : &local_refs;
 463
 464         if (option_single_branch) {
 465                 struct ref *remote_head = NULL;
 466
 467                 if (!option_branch)
 468                         remote_head = guess_remote_head(head, refs, 0);
 469                 else {
 470                         local_refs = NULL;
 471                         tail = &local_refs;
 472                         remote_head = copy_ref(find_remote_branch(refs, option_branch));
 473                 }
 474
 475                 if (!remote_head && option_branch)
 476                         warning(_("Could not find remote branch %s to clone."),
 477                                 option_branch);
 478                 else {
 479                         get_fetch_map(remote_head, refspec, &tail, 0);
 480
 481                         /* if --branch=tag, pull the requested tag explicitly */
 482                         get_fetch_map(remote_head, tag_refspec, &tail, 0);
 483                 }
 484         } else
 485                 get_fetch_map(refs, refspec, &tail, 0);
 486
 487         if (!option_mirror && !option_single_branch)
 488                 get_fetch_map(refs, tag_refspec, &tail, 0);
 489
 490         return local_refs;
 491 }
 492
 493 static void write_remote_refs(const struct ref *local_refs)
 494 {
 495         const struct ref *r;
 496
 497         for (r = local_refs; r; r = r->next) {
 498                 if (!r->peer_ref)
 499                         continue;
 500                 add_packed_ref(r->peer_ref->name, r->old_sha1);
 501         }
 502
 503         pack_refs(PACK_REFS_ALL);
 504 }
 505
 506 static void write_followtags(const struct ref *refs, const char *msg)
 507 {
 508         const struct ref *ref;
 509         for (ref = refs; ref; ref = ref->next) {
 510                 if (prefixcmp(ref->name, "refs/tags/"))
 511                         continue;
 512                 if (!suffixcmp(ref->name, "^{}"))
 513                         continue;
 514                 if (!has_sha1_file(ref->old_sha1))
 515                         continue;
 516                 update_ref(msg, ref->name, ref->old_sha1,
 517                            NULL, 0, DIE_ON_ERR);
 518         }
 519 }
 520
 521 static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
 522 {
 523         struct ref **rm = cb_data;
 524         struct ref *ref = *rm;
 525
 526         /*
 527          * Skip anything missing a peer_ref, which we are not
 528          * actually going to write a ref for.
 529          */
 530         while (ref && !ref->peer_ref)
 531                 ref = ref->next;
 532         /* Returning -1 notes "end of list" to the caller. */
 533         if (!ref)
 534                 return -1;
 535
 536         hashcpy(sha1, ref->old_sha1);
 537         *rm = ref->next;
 538         return 0;
 539 }
 540
 541 static void update_remote_refs(const struct ref *refs,
 542                                const struct ref *mapped_refs,
 543                                const struct ref *remote_head_points_at,
 544                                const char *branch_top,
 545                                const char *msg)
 546 {
 547         const struct ref *rm = mapped_refs;
 548
 549         if (0 <= option_verbosity)
 550                 printf(_("Checking connectivity... "));
 551         if (check_everything_connected(iterate_ref_map, 0, &rm))
 552                 die(_("remote did not send all necessary objects"));
 553         if (0 <= option_verbosity)
 554                 printf(_("done\n"));
 555
 556         if (refs) {
 557                 write_remote_refs(mapped_refs);
 558                 if (option_single_branch)
 559                         write_followtags(refs, msg);
 560         }
 561
 562         if (remote_head_points_at && !option_bare) {
 563                 struct strbuf head_ref = STRBUF_INIT;
 564                 strbuf_addstr(&head_ref, branch_top);
 565                 strbuf_addstr(&head_ref, "HEAD");
 566                 create_symref(head_ref.buf,
 567                               remote_head_points_at->peer_ref->name,
 568                               msg);
 569         }
 570 }
 571
 572 static void update_head(const struct ref *our, const struct ref *remote,
 573                         const char *msg)
 574 {
 575         if (our && !prefixcmp(our->name, "refs/heads/")) {
 576                 /* Local default branch link */
 577                 create_symref("HEAD", our->name, NULL);
 578                 if (!option_bare) {
 579                         const char *head = skip_prefix(our->name, "refs/heads/");
 580                         update_ref(msg, "HEAD", our->old_sha1, NULL, 0, DIE_ON_ERR);
 581                         install_branch_config(0, head, option_origin, our->name);
 582                 }
 583         } else if (our) {
 584                 struct commit *c = lookup_commit_reference(our->old_sha1);
 585                 /* --branch specifies a non-branch (i.e. tags), detach HEAD */
 586                 update_ref(msg, "HEAD", c->object.sha1,
 587                            NULL, REF_NODEREF, DIE_ON_ERR);
 588         } else if (remote) {
 589                 /*
 590                  * We know remote HEAD points to a non-branch, or
 591                  * HEAD points to a branch but we don't know which one.
 592                  * Detach HEAD in all these cases.
 593                  */
 594                 update_ref(msg, "HEAD", remote->old_sha1,
 595                            NULL, REF_NODEREF, DIE_ON_ERR);
 596         }
 597 }
 598
 599 static int checkout(void)
 600 {
 601         unsigned char sha1[20];
 602         char *head;
 603         struct lock_file *lock_file;
 604         struct unpack_trees_options opts;
 605         struct tree *tree;
 606         struct tree_desc t;
 607         int err = 0, fd;
 608
 609         if (option_no_checkout)
 610                 return 0;
 611
 612         head = resolve_refdup("HEAD", sha1, 1, NULL);
 613         if (!head) {
 614                 warning(_("remote HEAD refers to nonexistent ref, "
 615                           "unable to checkout.\n"));
 616                 return 0;
 617         }
 618         if (!strcmp(head, "HEAD")) {
 619                 if (advice_detached_head)
 620                         detach_advice(sha1_to_hex(sha1));
 621         } else {
 622                 if (prefixcmp(head, "refs/heads/"))
 623                         die(_("HEAD not found below refs/heads!"));
 624         }
 625         free(head);
 626
 627         /* We need to be in the new work tree for the checkout */
 628         setup_work_tree();
 629
 630         lock_file = xcalloc(1, sizeof(struct lock_file));
 631         fd = hold_locked_index(lock_file, 1);
 632
 633         memset(&opts, 0, sizeof opts);
 634         opts.update = 1;
 635         opts.merge = 1;
 636         opts.fn = oneway_merge;
 637         opts.verbose_update = (option_verbosity >= 0);
 638         opts.src_index = &the_index;
 639         opts.dst_index = &the_index;
 640
 641         tree = parse_tree_indirect(sha1);
 642         parse_tree(tree);
 643         init_tree_desc(&t, tree->buffer, tree->size);
 644         if (unpack_trees(1, &t, &opts) < 0)
 645                 die(_("unable to checkout working tree"));
 646
 647         if (write_cache(fd, active_cache, active_nr) ||
 648             commit_locked_index(lock_file))
 649                 die(_("unable to write new index file"));
 650
 651         err |= run_hook(NULL, "post-checkout", sha1_to_hex(null_sha1),
 652                         sha1_to_hex(sha1), "1", NULL);
 653
 654         if (!err && option_recursive)
 655                 err = run_command_v_opt(argv_submodule, RUN_GIT_CMD);
 656
 657         return err;
 658 }
 659
 660 static int write_one_config(const char *key, const char *value, void *data)
 661 {
 662         return git_config_set_multivar(key, value ? value : "true", "^$", 0);
 663 }
 664
 665 static void write_config(struct string_list *config)
 666 {
 667         int i;
 668
 669         for (i = 0; i < config->nr; i++) {
 670                 if (git_config_parse_parameter(config->items[i].string,
 671                                                write_one_config, NULL) < 0)
 672                         die("unable to write parameters to config file");
 673         }
 674 }
 675
 676 static void write_refspec_config(const char* src_ref_prefix,
 677                 const struct ref* our_head_points_at,
 678                 const struct ref* remote_head_points_at, struct strbuf* branch_top)
 679 {
 680         struct strbuf key = STRBUF_INIT;
 681         struct strbuf value = STRBUF_INIT;
 682
 683         if (option_mirror || !option_bare) {
 684                 if (option_single_branch && !option_mirror) {
 685                         if (option_branch) {
 686                                 if (strstr(our_head_points_at->name, "refs/tags/"))
 687                                         strbuf_addf(&value, "+%s:%s", our_head_points_at->name,
 688                                                 our_head_points_at->name);
 689                                 else
 690                                         strbuf_addf(&value, "+%s:%s%s", our_head_points_at->name,
 691                                                 branch_top->buf, option_branch);
 692                         } else if (remote_head_points_at) {
 693                                 strbuf_addf(&value, "+%s:%s%s", remote_head_points_at->name,
 694                                                 branch_top->buf,
 695                                                 skip_prefix(remote_head_points_at->name, "refs/heads/"));
 696                         }
 697                         /*
 698                          * otherwise, the next "git fetch" will
 699                          * simply fetch from HEAD without updating
 700                          * any remote tracking branch, which is what
 701                          * we want.
 702                          */
 703                 } else {
 704                         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top->buf);
 705                 }
 706                 /* Configure the remote */
 707                 if (value.len) {
 708                         strbuf_addf(&key, "remote.%s.fetch", option_origin);
 709                         git_config_set_multivar(key.buf, value.buf, "^$", 0);
 710                         strbuf_reset(&key);
 711
 712                         if (option_mirror) {
 713                                 strbuf_addf(&key, "remote.%s.mirror", option_origin);
 714                                 git_config_set(key.buf, "true");
 715                                 strbuf_reset(&key);
 716                         }
 717                 }
 718         }
 719
 720         strbuf_release(&key);
 721         strbuf_release(&value);
 722 }
 723
 724 int cmd_clone(int argc, const char **argv, const char *prefix)
 725 {
 726         int is_bundle = 0, is_local;
 727         struct stat buf;
 728         const char *repo_name, *repo, *work_tree, *git_dir;
 729         char *path, *dir;
 730         int dest_exists;
 731         const struct ref *refs, *remote_head;
 732         const struct ref *remote_head_points_at;
 733         const struct ref *our_head_points_at;
 734         struct ref *mapped_refs;
 735         const struct ref *ref;
 736         struct strbuf key = STRBUF_INIT, value = STRBUF_INIT;
 737         struct strbuf branch_top = STRBUF_INIT, reflog_msg = STRBUF_INIT;
 738         struct transport *transport = NULL;
 739         const char *src_ref_prefix = "refs/heads/";
 740         struct remote *remote;
 741         int err = 0, complete_refs_before_fetch = 1;
 742
 743         struct refspec *refspec;
 744         const char *fetch_pattern;
 745
 746         junk_pid = getpid();
 747
 748         packet_trace_identity("clone");
 749         argc = parse_options(argc, argv, prefix, builtin_clone_options,
 750                              builtin_clone_usage, 0);
 751
 752         if (argc > 2)
 753                 usage_msg_opt(_("Too many arguments."),
 754                         builtin_clone_usage, builtin_clone_options);
 755
 756         if (argc == 0)
 757                 usage_msg_opt(_("You must specify a repository to clone."),
 758                         builtin_clone_usage, builtin_clone_options);
 759
 760         if (option_single_branch == -1)
 761                 option_single_branch = option_depth ? 1 : 0;
 762
 763         if (option_mirror)
 764                 option_bare = 1;
 765
 766         if (option_bare) {
 767                 if (option_origin)
 768                         die(_("--bare and --origin %s options are incompatible."),
 769                             option_origin);
 770                 if (real_git_dir)
 771                         die(_("--bare and --separate-git-dir are incompatible."));
 772                 option_no_checkout = 1;
 773         }
 774
 775         if (!option_origin)
 776                 option_origin = "origin";
 777
 778         repo_name = argv[0];
 779
 780         path = get_repo_path(repo_name, &is_bundle);
 781         if (path)
 782                 repo = xstrdup(absolute_path(repo_name));
 783         else if (!strchr(repo_name, ':'))
 784                 die(_("repository '%s' does not exist"), repo_name);
 785         else
 786                 repo = repo_name;
 787         is_local = option_local != 0 && path && !is_bundle;
 788         if (is_local && option_depth)
 789                 warning(_("--depth is ignored in local clones; use file:// instead."));
 790
 791         if (argc == 2)
 792                 dir = xstrdup(argv[1]);
 793         else
 794                 dir = guess_dir_name(repo_name, is_bundle, option_bare);
 795         strip_trailing_slashes(dir);
 796
 797         dest_exists = !stat(dir, &buf);
 798         if (dest_exists && !is_empty_dir(dir))
 799                 die(_("destination path '%s' already exists and is not "
 800                         "an empty directory."), dir);
 801
 802         strbuf_addf(&reflog_msg, "clone: from %s", repo);
 803
 804         if (option_bare)
 805                 work_tree = NULL;
 806         else {
 807                 work_tree = getenv("GIT_WORK_TREE");
 808                 if (work_tree && !stat(work_tree, &buf))
 809                         die(_("working tree '%s' already exists."), work_tree);
 810         }
 811
 812         if (option_bare || work_tree)
 813                 git_dir = xstrdup(dir);
 814         else {
 815                 work_tree = dir;
 816                 git_dir = mkpathdup("%s/.git", dir);
 817         }
 818
 819         if (!option_bare) {
 820                 junk_work_tree = work_tree;
 821                 if (safe_create_leading_directories_const(work_tree) < 0)
 822                         die_errno(_("could not create leading directories of '%s'"),
 823                                   work_tree);
 824                 if (!dest_exists && mkdir(work_tree, 0777))
 825                         die_errno(_("could not create work tree dir '%s'."),
 826                                   work_tree);
 827                 set_git_work_tree(work_tree);
 828         }
 829         junk_git_dir = git_dir;
 830         atexit(remove_junk);
 831         sigchain_push_common(remove_junk_on_signal);
 832
 833         if (safe_create_leading_directories_const(git_dir) < 0)
 834                 die(_("could not create leading directories of '%s'"), git_dir);
 835
 836         set_git_dir_init(git_dir, real_git_dir, 0);
 837         if (real_git_dir) {
 838                 git_dir = real_git_dir;
 839                 junk_git_dir = real_git_dir;
 840         }
 841
 842         if (0 <= option_verbosity) {
 843                 if (option_bare)
 844                         printf(_("Cloning into bare repository '%s'...\n"), dir);
 845                 else
 846                         printf(_("Cloning into '%s'...\n"), dir);
 847         }
 848         init_db(option_template, INIT_DB_QUIET);
 849         write_config(&option_config);
 850
 851         git_config(git_default_config, NULL);
 852
 853         if (option_bare) {
 854                 if (option_mirror)
 855                         src_ref_prefix = "refs/";
 856                 strbuf_addstr(&branch_top, src_ref_prefix);
 857
 858                 git_config_set("core.bare", "true");
 859         } else {
 860                 strbuf_addf(&branch_top, "refs/remotes/%s/", option_origin);
 861         }
 862
 863         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top.buf);
 864         strbuf_addf(&key, "remote.%s.url", option_origin);
 865         git_config_set(key.buf, repo);
 866         strbuf_reset(&key);
 867
 868         if (option_reference.nr)
 869                 setup_reference();
 870
 871         fetch_pattern = value.buf;
 872         refspec = parse_fetch_refspec(1, &fetch_pattern);
 873
 874         strbuf_reset(&value);
 875
 876         remote = remote_get(option_origin);
 877         transport = transport_get(remote, remote->url[0]);
 878
 879         if (!is_local) {
 880                 if (!transport->get_refs_list || !transport->fetch)
 881                         die(_("Don't know how to clone %s"), transport->url);
 882
 883                 transport_set_option(transport, TRANS_OPT_KEEP, "yes");
 884
 885                 if (option_depth)
 886                         transport_set_option(transport, TRANS_OPT_DEPTH,
 887                                              option_depth);
 888                 if (option_single_branch)
 889                         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
 890
 891                 transport_set_verbosity(transport, option_verbosity, option_progress);
 892
 893                 if (option_upload_pack)
 894                         transport_set_option(transport, TRANS_OPT_UPLOADPACK,
 895                                              option_upload_pack);
 896         }
 897
 898         refs = transport_get_remote_refs(transport);
 899
 900         if (refs) {
 901                 mapped_refs = wanted_peer_refs(refs, refspec);
 902                 /*
 903                  * transport_get_remote_refs() may return refs with null sha-1
 904                  * in mapped_refs (see struct transport->get_refs_list
 905                  * comment). In that case we need fetch it early because
 906                  * remote_head code below relies on it.
 907                  *
 908                  * for normal clones, transport_get_remote_refs() should
 909                  * return reliable ref set, we can delay cloning until after
 910                  * remote HEAD check.
 911                  */
 912                 for (ref = refs; ref; ref = ref->next)
 913                         if (is_null_sha1(ref->old_sha1)) {
 914                                 complete_refs_before_fetch = 0;
 915                                 break;
 916                         }
 917
 918                 if (!is_local && !complete_refs_before_fetch)
 919                         transport_fetch_refs(transport, mapped_refs);
 920
 921                 remote_head = find_ref_by_name(refs, "HEAD");
 922                 remote_head_points_at =
 923                         guess_remote_head(remote_head, mapped_refs, 0);
 924
 925                 if (option_branch) {
 926                         our_head_points_at =
 927                                 find_remote_branch(mapped_refs, option_branch);
 928
 929                         if (!our_head_points_at)
 930                                 die(_("Remote branch %s not found in upstream %s"),
 931                                     option_branch, option_origin);
 932                 }
 933                 else
 934                         our_head_points_at = remote_head_points_at;
 935         }
 936         else {
 937                 warning(_("You appear to have cloned an empty repository."));
 938                 mapped_refs = NULL;
 939                 our_head_points_at = NULL;
 940                 remote_head_points_at = NULL;
 941                 remote_head = NULL;
 942                 option_no_checkout = 1;
 943                 if (!option_bare)
 944                         install_branch_config(0, "master", option_origin,
 945                                               "refs/heads/master");
 946         }
 947
 948         write_refspec_config(src_ref_prefix, our_head_points_at,
 949                         remote_head_points_at, &branch_top);
 950
 951         if (is_local)
 952                 clone_local(path, git_dir);
 953         else if (refs && complete_refs_before_fetch)
 954                 transport_fetch_refs(transport, mapped_refs);
 955
 956         update_remote_refs(refs, mapped_refs, remote_head_points_at,
 957                            branch_top.buf, reflog_msg.buf);
 958
 959         update_head(our_head_points_at, remote_head, reflog_msg.buf);
 960
 961         transport_unlock_pack(transport);
 962         transport_disconnect(transport);
 963
 964         junk_mode = JUNK_LEAVE_REPO;
 965         err = checkout();
 966
 967         strbuf_release(&reflog_msg);
 968         strbuf_release(&branch_top);
 969         strbuf_release(&key);
 970         strbuf_release(&value);
 971         junk_mode = JUNK_LEAVE_ALL;
 972         return err;
 973 }