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 "lockfile.h"
  13 #include "parse-options.h"
  14 #include "fetch-pack.h"
  15 #include "refs.h"
  16 #include "tree.h"
  17 #include "tree-walk.h"
  18 #include "unpack-trees.h"
  19 #include "transport.h"
  20 #include "strbuf.h"
  21 #include "dir.h"
  22 #include "sigchain.h"
  23 #include "branch.h"
  24 #include "remote.h"
  25 #include "run-command.h"
  26 #include "connected.h"
  27
  28 /*
  29  * Overall FIXMEs:
  30  *  - respect DB_ENVIRONMENT for .git/objects.
  31  *
  32  * Implementation notes:
  33  *  - dropping use-separate-remote and no-separate-remote compatibility
  34  *
  35  */
  36 static const char * const builtin_clone_usage[] = {
  37         N_("git clone [<options>] [--] <repo> [<dir>]"),
  38         NULL
  39 };
  40
  41 static int option_no_checkout, option_bare, option_mirror, option_single_branch = -1;
  42 static int option_local = -1, option_no_hardlinks, option_shared, option_recursive;
  43 static char *option_template, *option_depth;
  44 static char *option_origin = NULL;
  45 static char *option_branch = NULL;
  46 static const char *real_git_dir;
  47 static char *option_upload_pack = "git-upload-pack";
  48 static int option_verbosity;
  49 static int option_progress = -1;
  50 static struct string_list option_config;
  51 static struct string_list option_reference;
  52 static int option_dissociate;
  53 static int max_jobs = -1;
  54
  55 static struct option builtin_clone_options[] = {
  56         OPT__VERBOSITY(&option_verbosity),
  57         OPT_BOOL(0, "progress", &option_progress,
  58                  N_("force progress reporting")),
  59         OPT_BOOL('n', "no-checkout", &option_no_checkout,
  60                  N_("don't create a checkout")),
  61         OPT_BOOL(0, "bare", &option_bare, N_("create a bare repository")),
  62         OPT_HIDDEN_BOOL(0, "naked", &option_bare,
  63                         N_("create a bare repository")),
  64         OPT_BOOL(0, "mirror", &option_mirror,
  65                  N_("create a mirror repository (implies bare)")),
  66         OPT_BOOL('l', "local", &option_local,
  67                 N_("to clone from a local repository")),
  68         OPT_BOOL(0, "no-hardlinks", &option_no_hardlinks,
  69                     N_("don't use local hardlinks, always copy")),
  70         OPT_BOOL('s', "shared", &option_shared,
  71                     N_("setup as shared repository")),
  72         OPT_BOOL(0, "recursive", &option_recursive,
  73                     N_("initialize submodules in the clone")),
  74         OPT_BOOL(0, "recurse-submodules", &option_recursive,
  75                     N_("initialize submodules in the clone")),
  76         OPT_INTEGER('j', "jobs", &max_jobs,
  77                     N_("number of submodules cloned in parallel")),
  78         OPT_STRING(0, "template", &option_template, N_("template-directory"),
  79                    N_("directory from which templates will be used")),
  80         OPT_STRING_LIST(0, "reference", &option_reference, N_("repo"),
  81                         N_("reference repository")),
  82         OPT_BOOL(0, "dissociate", &option_dissociate,
  83                  N_("use --reference only while cloning")),
  84         OPT_STRING('o', "origin", &option_origin, N_("name"),
  85                    N_("use <name> instead of 'origin' to track upstream")),
  86         OPT_STRING('b', "branch", &option_branch, N_("branch"),
  87                    N_("checkout <branch> instead of the remote's HEAD")),
  88         OPT_STRING('u', "upload-pack", &option_upload_pack, N_("path"),
  89                    N_("path to git-upload-pack on the remote")),
  90         OPT_STRING(0, "depth", &option_depth, N_("depth"),
  91                     N_("create a shallow clone of that depth")),
  92         OPT_BOOL(0, "single-branch", &option_single_branch,
  93                     N_("clone only one branch, HEAD or --branch")),
  94         OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
  95                    N_("separate git dir from working tree")),
  96         OPT_STRING_LIST('c', "config", &option_config, N_("key=value"),
  97                         N_("set config inside the new repository")),
  98         OPT_END()
  99 };
 100
 101 static const char *get_repo_path_1(struct strbuf *path, int *is_bundle)
 102 {
 103         static char *suffix[] = { "/.git", "", ".git/.git", ".git" };
 104         static char *bundle_suffix[] = { ".bundle", "" };
 105         size_t baselen = path->len;
 106         struct stat st;
 107         int i;
 108
 109         for (i = 0; i < ARRAY_SIZE(suffix); i++) {
 110                 strbuf_setlen(path, baselen);
 111                 strbuf_addstr(path, suffix[i]);
 112                 if (stat(path->buf, &st))
 113                         continue;
 114                 if (S_ISDIR(st.st_mode) && is_git_directory(path->buf)) {
 115                         *is_bundle = 0;
 116                         return path->buf;
 117                 } else if (S_ISREG(st.st_mode) && st.st_size > 8) {
 118                         /* Is it a "gitfile"? */
 119                         char signature[8];
 120                         const char *dst;
 121                         int len, fd = open(path->buf, O_RDONLY);
 122                         if (fd < 0)
 123                                 continue;
 124                         len = read_in_full(fd, signature, 8);
 125                         close(fd);
 126                         if (len != 8 || strncmp(signature, "gitdir: ", 8))
 127                                 continue;
 128                         dst = read_gitfile(path->buf);
 129                         if (dst) {
 130                                 *is_bundle = 0;
 131                                 return dst;
 132                         }
 133                 }
 134         }
 135
 136         for (i = 0; i < ARRAY_SIZE(bundle_suffix); i++) {
 137                 strbuf_setlen(path, baselen);
 138                 strbuf_addstr(path, bundle_suffix[i]);
 139                 if (!stat(path->buf, &st) && S_ISREG(st.st_mode)) {
 140                         *is_bundle = 1;
 141                         return path->buf;
 142                 }
 143         }
 144
 145         return NULL;
 146 }
 147
 148 static char *get_repo_path(const char *repo, int *is_bundle)
 149 {
 150         struct strbuf path = STRBUF_INIT;
 151         const char *raw;
 152         char *canon;
 153
 154         strbuf_addstr(&path, repo);
 155         raw = get_repo_path_1(&path, is_bundle);
 156         canon = raw ? xstrdup(absolute_path(raw)) : NULL;
 157         strbuf_release(&path);
 158         return canon;
 159 }
 160
 161 static char *guess_dir_name(const char *repo, int is_bundle, int is_bare)
 162 {
 163         const char *end = repo + strlen(repo), *start, *ptr;
 164         size_t len;
 165         char *dir;
 166
 167         /*
 168          * Skip scheme.
 169          */
 170         start = strstr(repo, "://");
 171         if (start == NULL)
 172                 start = repo;
 173         else
 174                 start += 3;
 175
 176         /*
 177          * Skip authentication data. The stripping does happen
 178          * greedily, such that we strip up to the last '@' inside
 179          * the host part.
 180          */
 181         for (ptr = start; ptr < end && !is_dir_sep(*ptr); ptr++) {
 182                 if (*ptr == '@')
 183                         start = ptr + 1;
 184         }
 185
 186         /*
 187          * Strip trailing spaces, slashes and /.git
 188          */
 189         while (start < end && (is_dir_sep(end[-1]) || isspace(end[-1])))
 190                 end--;
 191         if (end - start > 5 && is_dir_sep(end[-5]) &&
 192             !strncmp(end - 4, ".git", 4)) {
 193                 end -= 5;
 194                 while (start < end && is_dir_sep(end[-1]))
 195                         end--;
 196         }
 197
 198         /*
 199          * Strip trailing port number if we've got only a
 200          * hostname (that is, there is no dir separator but a
 201          * colon). This check is required such that we do not
 202          * strip URI's like '/foo/bar:2222.git', which should
 203          * result in a dir '2222' being guessed due to backwards
 204          * compatibility.
 205          */
 206         if (memchr(start, '/', end - start) == NULL
 207             && memchr(start, ':', end - start) != NULL) {
 208                 ptr = end;
 209                 while (start < ptr && isdigit(ptr[-1]) && ptr[-1] != ':')
 210                         ptr--;
 211                 if (start < ptr && ptr[-1] == ':')
 212                         end = ptr - 1;
 213         }
 214
 215         /*
 216          * Find last component. To remain backwards compatible we
 217          * also regard colons as path separators, such that
 218          * cloning a repository 'foo:bar.git' would result in a
 219          * directory 'bar' being guessed.
 220          */
 221         ptr = end;
 222         while (start < ptr && !is_dir_sep(ptr[-1]) && ptr[-1] != ':')
 223                 ptr--;
 224         start = ptr;
 225
 226         /*
 227          * Strip .{bundle,git}.
 228          */
 229         len = end - start;
 230         strip_suffix_mem(start, &len, is_bundle ? ".bundle" : ".git");
 231
 232         if (!len || (len == 1 && *start == '/'))
 233             die("No directory name could be guessed.\n"
 234                 "Please specify a directory on the command line");
 235
 236         if (is_bare)
 237                 dir = xstrfmt("%.*s.git", (int)len, start);
 238         else
 239                 dir = xstrndup(start, len);
 240         /*
 241          * Replace sequences of 'control' characters and whitespace
 242          * with one ascii space, remove leading and trailing spaces.
 243          */
 244         if (*dir) {
 245                 char *out = dir;
 246                 int prev_space = 1 /* strip leading whitespace */;
 247                 for (end = dir; *end; ++end) {
 248                         char ch = *end;
 249                         if ((unsigned char)ch < '\x20')
 250                                 ch = '\x20';
 251                         if (isspace(ch)) {
 252                                 if (prev_space)
 253                                         continue;
 254                                 prev_space = 1;
 255                         } else
 256                                 prev_space = 0;
 257                         *out++ = ch;
 258                 }
 259                 *out = '\0';
 260                 if (out > dir && prev_space)
 261                         out[-1] = '\0';
 262         }
 263         return dir;
 264 }
 265
 266 static void strip_trailing_slashes(char *dir)
 267 {
 268         char *end = dir + strlen(dir);
 269
 270         while (dir < end - 1 && is_dir_sep(end[-1]))
 271                 end--;
 272         *end = '\0';
 273 }
 274
 275 static int add_one_reference(struct string_list_item *item, void *cb_data)
 276 {
 277         char *ref_git;
 278         const char *repo;
 279         struct strbuf alternate = STRBUF_INIT;
 280
 281         /* Beware: read_gitfile(), real_path() and mkpath() return static buffer */
 282         ref_git = xstrdup(real_path(item->string));
 283
 284         repo = read_gitfile(ref_git);
 285         if (!repo)
 286                 repo = read_gitfile(mkpath("%s/.git", ref_git));
 287         if (repo) {
 288                 free(ref_git);
 289                 ref_git = xstrdup(repo);
 290         }
 291
 292         if (!repo && is_directory(mkpath("%s/.git/objects", ref_git))) {
 293                 char *ref_git_git = mkpathdup("%s/.git", ref_git);
 294                 free(ref_git);
 295                 ref_git = ref_git_git;
 296         } else if (!is_directory(mkpath("%s/objects", ref_git))) {
 297                 struct strbuf sb = STRBUF_INIT;
 298                 if (get_common_dir(&sb, ref_git))
 299                         die(_("reference repository '%s' as a linked checkout is not supported yet."),
 300                             item->string);
 301                 die(_("reference repository '%s' is not a local repository."),
 302                     item->string);
 303         }
 304
 305         if (!access(mkpath("%s/shallow", ref_git), F_OK))
 306                 die(_("reference repository '%s' is shallow"), item->string);
 307
 308         if (!access(mkpath("%s/info/grafts", ref_git), F_OK))
 309                 die(_("reference repository '%s' is grafted"), item->string);
 310
 311         strbuf_addf(&alternate, "%s/objects", ref_git);
 312         add_to_alternates_file(alternate.buf);
 313         strbuf_release(&alternate);
 314         free(ref_git);
 315         return 0;
 316 }
 317
 318 static void setup_reference(void)
 319 {
 320         for_each_string_list(&option_reference, add_one_reference, NULL);
 321 }
 322
 323 static void copy_alternates(struct strbuf *src, struct strbuf *dst,
 324                             const char *src_repo)
 325 {
 326         /*
 327          * Read from the source objects/info/alternates file
 328          * and copy the entries to corresponding file in the
 329          * destination repository with add_to_alternates_file().
 330          * Both src and dst have "$path/objects/info/alternates".
 331          *
 332          * Instead of copying bit-for-bit from the original,
 333          * we need to append to existing one so that the already
 334          * created entry via "clone -s" is not lost, and also
 335          * to turn entries with paths relative to the original
 336          * absolute, so that they can be used in the new repository.
 337          */
 338         FILE *in = fopen(src->buf, "r");
 339         struct strbuf line = STRBUF_INIT;
 340
 341         while (strbuf_getline(&line, in, '\n') != EOF) {
 342                 char *abs_path;
 343                 if (!line.len || line.buf[0] == '#')
 344                         continue;
 345                 if (is_absolute_path(line.buf)) {
 346                         add_to_alternates_file(line.buf);
 347                         continue;
 348                 }
 349                 abs_path = mkpathdup("%s/objects/%s", src_repo, line.buf);
 350                 normalize_path_copy(abs_path, abs_path);
 351                 add_to_alternates_file(abs_path);
 352                 free(abs_path);
 353         }
 354         strbuf_release(&line);
 355         fclose(in);
 356 }
 357
 358 static void copy_or_link_directory(struct strbuf *src, struct strbuf *dest,
 359                                    const char *src_repo, int src_baselen)
 360 {
 361         struct dirent *de;
 362         struct stat buf;
 363         int src_len, dest_len;
 364         DIR *dir;
 365
 366         dir = opendir(src->buf);
 367         if (!dir)
 368                 die_errno(_("failed to open '%s'"), src->buf);
 369
 370         if (mkdir(dest->buf, 0777)) {
 371                 if (errno != EEXIST)
 372                         die_errno(_("failed to create directory '%s'"), dest->buf);
 373                 else if (stat(dest->buf, &buf))
 374                         die_errno(_("failed to stat '%s'"), dest->buf);
 375                 else if (!S_ISDIR(buf.st_mode))
 376                         die(_("%s exists and is not a directory"), dest->buf);
 377         }
 378
 379         strbuf_addch(src, '/');
 380         src_len = src->len;
 381         strbuf_addch(dest, '/');
 382         dest_len = dest->len;
 383
 384         while ((de = readdir(dir)) != NULL) {
 385                 strbuf_setlen(src, src_len);
 386                 strbuf_addstr(src, de->d_name);
 387                 strbuf_setlen(dest, dest_len);
 388                 strbuf_addstr(dest, de->d_name);
 389                 if (stat(src->buf, &buf)) {
 390                         warning (_("failed to stat %s\n"), src->buf);
 391                         continue;
 392                 }
 393                 if (S_ISDIR(buf.st_mode)) {
 394                         if (de->d_name[0] != '.')
 395                                 copy_or_link_directory(src, dest,
 396                                                        src_repo, src_baselen);
 397                         continue;
 398                 }
 399
 400                 /* Files that cannot be copied bit-for-bit... */
 401                 if (!strcmp(src->buf + src_baselen, "/info/alternates")) {
 402                         copy_alternates(src, dest, src_repo);
 403                         continue;
 404                 }
 405
 406                 if (unlink(dest->buf) && errno != ENOENT)
 407                         die_errno(_("failed to unlink '%s'"), dest->buf);
 408                 if (!option_no_hardlinks) {
 409                         if (!link(src->buf, dest->buf))
 410                                 continue;
 411                         if (option_local > 0)
 412                                 die_errno(_("failed to create link '%s'"), dest->buf);
 413                         option_no_hardlinks = 1;
 414                 }
 415                 if (copy_file_with_time(dest->buf, src->buf, 0666))
 416                         die_errno(_("failed to copy file to '%s'"), dest->buf);
 417         }
 418         closedir(dir);
 419 }
 420
 421 static void clone_local(const char *src_repo, const char *dest_repo)
 422 {
 423         if (option_shared) {
 424                 struct strbuf alt = STRBUF_INIT;
 425                 strbuf_addf(&alt, "%s/objects", src_repo);
 426                 add_to_alternates_file(alt.buf);
 427                 strbuf_release(&alt);
 428         } else {
 429                 struct strbuf src = STRBUF_INIT;
 430                 struct strbuf dest = STRBUF_INIT;
 431                 get_common_dir(&src, src_repo);
 432                 get_common_dir(&dest, dest_repo);
 433                 strbuf_addstr(&src, "/objects");
 434                 strbuf_addstr(&dest, "/objects");
 435                 copy_or_link_directory(&src, &dest, src_repo, src.len);
 436                 strbuf_release(&src);
 437                 strbuf_release(&dest);
 438         }
 439
 440         if (0 <= option_verbosity)
 441                 fprintf(stderr, _("done.\n"));
 442 }
 443
 444 static const char *junk_work_tree;
 445 static const char *junk_git_dir;
 446 static enum {
 447         JUNK_LEAVE_NONE,
 448         JUNK_LEAVE_REPO,
 449         JUNK_LEAVE_ALL
 450 } junk_mode = JUNK_LEAVE_NONE;
 451
 452 static const char junk_leave_repo_msg[] =
 453 N_("Clone succeeded, but checkout failed.\n"
 454    "You can inspect what was checked out with 'git status'\n"
 455    "and retry the checkout with 'git checkout -f HEAD'\n");
 456
 457 static void remove_junk(void)
 458 {
 459         struct strbuf sb = STRBUF_INIT;
 460
 461         switch (junk_mode) {
 462         case JUNK_LEAVE_REPO:
 463                 warning("%s", _(junk_leave_repo_msg));
 464                 /* fall-through */
 465         case JUNK_LEAVE_ALL:
 466                 return;
 467         default:
 468                 /* proceed to removal */
 469                 break;
 470         }
 471
 472         if (junk_git_dir) {
 473                 strbuf_addstr(&sb, junk_git_dir);
 474                 remove_dir_recursively(&sb, 0);
 475                 strbuf_reset(&sb);
 476         }
 477         if (junk_work_tree) {
 478                 strbuf_addstr(&sb, junk_work_tree);
 479                 remove_dir_recursively(&sb, 0);
 480                 strbuf_reset(&sb);
 481         }
 482 }
 483
 484 static void remove_junk_on_signal(int signo)
 485 {
 486         remove_junk();
 487         sigchain_pop(signo);
 488         raise(signo);
 489 }
 490
 491 static struct ref *find_remote_branch(const struct ref *refs, const char *branch)
 492 {
 493         struct ref *ref;
 494         struct strbuf head = STRBUF_INIT;
 495         strbuf_addstr(&head, "refs/heads/");
 496         strbuf_addstr(&head, branch);
 497         ref = find_ref_by_name(refs, head.buf);
 498         strbuf_release(&head);
 499
 500         if (ref)
 501                 return ref;
 502
 503         strbuf_addstr(&head, "refs/tags/");
 504         strbuf_addstr(&head, branch);
 505         ref = find_ref_by_name(refs, head.buf);
 506         strbuf_release(&head);
 507
 508         return ref;
 509 }
 510
 511 static struct ref *wanted_peer_refs(const struct ref *refs,
 512                 struct refspec *refspec)
 513 {
 514         struct ref *head = copy_ref(find_ref_by_name(refs, "HEAD"));
 515         struct ref *local_refs = head;
 516         struct ref **tail = head ? &head->next : &local_refs;
 517
 518         if (option_single_branch) {
 519                 struct ref *remote_head = NULL;
 520
 521                 if (!option_branch)
 522                         remote_head = guess_remote_head(head, refs, 0);
 523                 else {
 524                         local_refs = NULL;
 525                         tail = &local_refs;
 526                         remote_head = copy_ref(find_remote_branch(refs, option_branch));
 527                 }
 528
 529                 if (!remote_head && option_branch)
 530                         warning(_("Could not find remote branch %s to clone."),
 531                                 option_branch);
 532                 else {
 533                         get_fetch_map(remote_head, refspec, &tail, 0);
 534
 535                         /* if --branch=tag, pull the requested tag explicitly */
 536                         get_fetch_map(remote_head, tag_refspec, &tail, 0);
 537                 }
 538         } else
 539                 get_fetch_map(refs, refspec, &tail, 0);
 540
 541         if (!option_mirror && !option_single_branch)
 542                 get_fetch_map(refs, tag_refspec, &tail, 0);
 543
 544         return local_refs;
 545 }
 546
 547 static void write_remote_refs(const struct ref *local_refs)
 548 {
 549         const struct ref *r;
 550
 551         struct ref_transaction *t;
 552         struct strbuf err = STRBUF_INIT;
 553
 554         t = ref_transaction_begin(&err);
 555         if (!t)
 556                 die("%s", err.buf);
 557
 558         for (r = local_refs; r; r = r->next) {
 559                 if (!r->peer_ref)
 560                         continue;
 561                 if (ref_transaction_create(t, r->peer_ref->name, r->old_oid.hash,
 562                                            0, NULL, &err))
 563                         die("%s", err.buf);
 564         }
 565
 566         if (initial_ref_transaction_commit(t, &err))
 567                 die("%s", err.buf);
 568
 569         strbuf_release(&err);
 570         ref_transaction_free(t);
 571 }
 572
 573 static void write_followtags(const struct ref *refs, const char *msg)
 574 {
 575         const struct ref *ref;
 576         for (ref = refs; ref; ref = ref->next) {
 577                 if (!starts_with(ref->name, "refs/tags/"))
 578                         continue;
 579                 if (ends_with(ref->name, "^{}"))
 580                         continue;
 581                 if (!has_object_file(&ref->old_oid))
 582                         continue;
 583                 update_ref(msg, ref->name, ref->old_oid.hash,
 584                            NULL, 0, UPDATE_REFS_DIE_ON_ERR);
 585         }
 586 }
 587
 588 static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
 589 {
 590         struct ref **rm = cb_data;
 591         struct ref *ref = *rm;
 592
 593         /*
 594          * Skip anything missing a peer_ref, which we are not
 595          * actually going to write a ref for.
 596          */
 597         while (ref && !ref->peer_ref)
 598                 ref = ref->next;
 599         /* Returning -1 notes "end of list" to the caller. */
 600         if (!ref)
 601                 return -1;
 602
 603         hashcpy(sha1, ref->old_oid.hash);
 604         *rm = ref->next;
 605         return 0;
 606 }
 607
 608 static void update_remote_refs(const struct ref *refs,
 609                                const struct ref *mapped_refs,
 610                                const struct ref *remote_head_points_at,
 611                                const char *branch_top,
 612                                const char *msg,
 613                                struct transport *transport,
 614                                int check_connectivity)
 615 {
 616         const struct ref *rm = mapped_refs;
 617
 618         if (check_connectivity) {
 619                 if (transport->progress)
 620                         fprintf(stderr, _("Checking connectivity... "));
 621                 if (check_everything_connected_with_transport(iterate_ref_map,
 622                                                               0, &rm, transport))
 623                         die(_("remote did not send all necessary objects"));
 624                 if (transport->progress)
 625                         fprintf(stderr, _("done.\n"));
 626         }
 627
 628         if (refs) {
 629                 write_remote_refs(mapped_refs);
 630                 if (option_single_branch)
 631                         write_followtags(refs, msg);
 632         }
 633
 634         if (remote_head_points_at && !option_bare) {
 635                 struct strbuf head_ref = STRBUF_INIT;
 636                 strbuf_addstr(&head_ref, branch_top);
 637                 strbuf_addstr(&head_ref, "HEAD");
 638                 create_symref(head_ref.buf,
 639                               remote_head_points_at->peer_ref->name,
 640                               msg);
 641         }
 642 }
 643
 644 static void update_head(const struct ref *our, const struct ref *remote,
 645                         const char *msg)
 646 {
 647         const char *head;
 648         if (our && skip_prefix(our->name, "refs/heads/", &head)) {
 649                 /* Local default branch link */
 650                 create_symref("HEAD", our->name, NULL);
 651                 if (!option_bare) {
 652                         update_ref(msg, "HEAD", our->old_oid.hash, NULL, 0,
 653                                    UPDATE_REFS_DIE_ON_ERR);
 654                         install_branch_config(0, head, option_origin, our->name);
 655                 }
 656         } else if (our) {
 657                 struct commit *c = lookup_commit_reference(our->old_oid.hash);
 658                 /* --branch specifies a non-branch (i.e. tags), detach HEAD */
 659                 update_ref(msg, "HEAD", c->object.oid.hash,
 660                            NULL, REF_NODEREF, UPDATE_REFS_DIE_ON_ERR);
 661         } else if (remote) {
 662                 /*
 663                  * We know remote HEAD points to a non-branch, or
 664                  * HEAD points to a branch but we don't know which one.
 665                  * Detach HEAD in all these cases.
 666                  */
 667                 update_ref(msg, "HEAD", remote->old_oid.hash,
 668                            NULL, REF_NODEREF, UPDATE_REFS_DIE_ON_ERR);
 669         }
 670 }
 671
 672 static int checkout(void)
 673 {
 674         unsigned char sha1[20];
 675         char *head;
 676         struct lock_file *lock_file;
 677         struct unpack_trees_options opts;
 678         struct tree *tree;
 679         struct tree_desc t;
 680         int err = 0;
 681
 682         if (option_no_checkout)
 683                 return 0;
 684
 685         head = resolve_refdup("HEAD", RESOLVE_REF_READING, sha1, NULL);
 686         if (!head) {
 687                 warning(_("remote HEAD refers to nonexistent ref, "
 688                           "unable to checkout.\n"));
 689                 return 0;
 690         }
 691         if (!strcmp(head, "HEAD")) {
 692                 if (advice_detached_head)
 693                         detach_advice(sha1_to_hex(sha1));
 694         } else {
 695                 if (!starts_with(head, "refs/heads/"))
 696                         die(_("HEAD not found below refs/heads!"));
 697         }
 698         free(head);
 699
 700         /* We need to be in the new work tree for the checkout */
 701         setup_work_tree();
 702
 703         lock_file = xcalloc(1, sizeof(struct lock_file));
 704         hold_locked_index(lock_file, 1);
 705
 706         memset(&opts, 0, sizeof opts);
 707         opts.update = 1;
 708         opts.merge = 1;
 709         opts.fn = oneway_merge;
 710         opts.verbose_update = (option_verbosity >= 0);
 711         opts.src_index = &the_index;
 712         opts.dst_index = &the_index;
 713
 714         tree = parse_tree_indirect(sha1);
 715         parse_tree(tree);
 716         init_tree_desc(&t, tree->buffer, tree->size);
 717         if (unpack_trees(1, &t, &opts) < 0)
 718                 die(_("unable to checkout working tree"));
 719
 720         if (write_locked_index(&the_index, lock_file, COMMIT_LOCK))
 721                 die(_("unable to write new index file"));
 722
 723         err |= run_hook_le(NULL, "post-checkout", sha1_to_hex(null_sha1),
 724                            sha1_to_hex(sha1), "1", NULL);
 725
 726         if (!err && option_recursive) {
 727                 struct argv_array args = ARGV_ARRAY_INIT;
 728                 argv_array_pushl(&args, "submodule", "update", "--init", "--recursive", NULL);
 729
 730                 if (max_jobs != -1)
 731                         argv_array_pushf(&args, "--jobs=%d", max_jobs);
 732
 733                 err = run_command_v_opt(args.argv, RUN_GIT_CMD);
 734                 argv_array_clear(&args);
 735         }
 736
 737         return err;
 738 }
 739
 740 static int write_one_config(const char *key, const char *value, void *data)
 741 {
 742         return git_config_set_multivar(key, value ? value : "true", "^$", 0);
 743 }
 744
 745 static void write_config(struct string_list *config)
 746 {
 747         int i;
 748
 749         for (i = 0; i < config->nr; i++) {
 750                 if (git_config_parse_parameter(config->items[i].string,
 751                                                write_one_config, NULL) < 0)
 752                         die("unable to write parameters to config file");
 753         }
 754 }
 755
 756 static void write_refspec_config(const char *src_ref_prefix,
 757                 const struct ref *our_head_points_at,
 758                 const struct ref *remote_head_points_at,
 759                 struct strbuf *branch_top)
 760 {
 761         struct strbuf key = STRBUF_INIT;
 762         struct strbuf value = STRBUF_INIT;
 763
 764         if (option_mirror || !option_bare) {
 765                 if (option_single_branch && !option_mirror) {
 766                         if (option_branch) {
 767                                 if (starts_with(our_head_points_at->name, "refs/tags/"))
 768                                         strbuf_addf(&value, "+%s:%s", our_head_points_at->name,
 769                                                 our_head_points_at->name);
 770                                 else
 771                                         strbuf_addf(&value, "+%s:%s%s", our_head_points_at->name,
 772                                                 branch_top->buf, option_branch);
 773                         } else if (remote_head_points_at) {
 774                                 const char *head = remote_head_points_at->name;
 775                                 if (!skip_prefix(head, "refs/heads/", &head))
 776                                         die("BUG: remote HEAD points at non-head?");
 777
 778                                 strbuf_addf(&value, "+%s:%s%s", remote_head_points_at->name,
 779                                                 branch_top->buf, head);
 780                         }
 781                         /*
 782                          * otherwise, the next "git fetch" will
 783                          * simply fetch from HEAD without updating
 784                          * any remote-tracking branch, which is what
 785                          * we want.
 786                          */
 787                 } else {
 788                         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top->buf);
 789                 }
 790                 /* Configure the remote */
 791                 if (value.len) {
 792                         strbuf_addf(&key, "remote.%s.fetch", option_origin);
 793                         git_config_set_multivar(key.buf, value.buf, "^$", 0);
 794                         strbuf_reset(&key);
 795
 796                         if (option_mirror) {
 797                                 strbuf_addf(&key, "remote.%s.mirror", option_origin);
 798                                 git_config_set(key.buf, "true");
 799                                 strbuf_reset(&key);
 800                         }
 801                 }
 802         }
 803
 804         strbuf_release(&key);
 805         strbuf_release(&value);
 806 }
 807
 808 static void dissociate_from_references(void)
 809 {
 810         static const char* argv[] = { "repack", "-a", "-d", NULL };
 811         char *alternates = git_pathdup("objects/info/alternates");
 812
 813         if (!access(alternates, F_OK)) {
 814                 if (run_command_v_opt(argv, RUN_GIT_CMD|RUN_COMMAND_NO_STDIN))
 815                         die(_("cannot repack to clean up"));
 816                 if (unlink(alternates) && errno != ENOENT)
 817                         die_errno(_("cannot unlink temporary alternates file"));
 818         }
 819         free(alternates);
 820 }
 821
 822 int cmd_clone(int argc, const char **argv, const char *prefix)
 823 {
 824         int is_bundle = 0, is_local;
 825         struct stat buf;
 826         const char *repo_name, *repo, *work_tree, *git_dir;
 827         char *path, *dir;
 828         int dest_exists;
 829         const struct ref *refs, *remote_head;
 830         const struct ref *remote_head_points_at;
 831         const struct ref *our_head_points_at;
 832         struct ref *mapped_refs;
 833         const struct ref *ref;
 834         struct strbuf key = STRBUF_INIT, value = STRBUF_INIT;
 835         struct strbuf branch_top = STRBUF_INIT, reflog_msg = STRBUF_INIT;
 836         struct transport *transport = NULL;
 837         const char *src_ref_prefix = "refs/heads/";
 838         struct remote *remote;
 839         int err = 0, complete_refs_before_fetch = 1;
 840
 841         struct refspec *refspec;
 842         const char *fetch_pattern;
 843
 844         packet_trace_identity("clone");
 845         argc = parse_options(argc, argv, prefix, builtin_clone_options,
 846                              builtin_clone_usage, 0);
 847
 848         if (argc > 2)
 849                 usage_msg_opt(_("Too many arguments."),
 850                         builtin_clone_usage, builtin_clone_options);
 851
 852         if (argc == 0)
 853                 usage_msg_opt(_("You must specify a repository to clone."),
 854                         builtin_clone_usage, builtin_clone_options);
 855
 856         if (option_single_branch == -1)
 857                 option_single_branch = option_depth ? 1 : 0;
 858
 859         if (option_mirror)
 860                 option_bare = 1;
 861
 862         if (option_bare) {
 863                 if (option_origin)
 864                         die(_("--bare and --origin %s options are incompatible."),
 865                             option_origin);
 866                 if (real_git_dir)
 867                         die(_("--bare and --separate-git-dir are incompatible."));
 868                 option_no_checkout = 1;
 869         }
 870
 871         if (!option_origin)
 872                 option_origin = "origin";
 873
 874         repo_name = argv[0];
 875
 876         path = get_repo_path(repo_name, &is_bundle);
 877         if (path)
 878                 repo = xstrdup(absolute_path(repo_name));
 879         else if (!strchr(repo_name, ':'))
 880                 die(_("repository '%s' does not exist"), repo_name);
 881         else
 882                 repo = repo_name;
 883
 884         /* no need to be strict, transport_set_option() will validate it again */
 885         if (option_depth && atoi(option_depth) < 1)
 886                 die(_("depth %s is not a positive number"), option_depth);
 887
 888         if (argc == 2)
 889                 dir = xstrdup(argv[1]);
 890         else
 891                 dir = guess_dir_name(repo_name, is_bundle, option_bare);
 892         strip_trailing_slashes(dir);
 893
 894         dest_exists = !stat(dir, &buf);
 895         if (dest_exists && !is_empty_dir(dir))
 896                 die(_("destination path '%s' already exists and is not "
 897                         "an empty directory."), dir);
 898
 899         strbuf_addf(&reflog_msg, "clone: from %s", repo);
 900
 901         if (option_bare)
 902                 work_tree = NULL;
 903         else {
 904                 work_tree = getenv("GIT_WORK_TREE");
 905                 if (work_tree && !stat(work_tree, &buf))
 906                         die(_("working tree '%s' already exists."), work_tree);
 907         }
 908
 909         if (option_bare || work_tree)
 910                 git_dir = xstrdup(dir);
 911         else {
 912                 work_tree = dir;
 913                 git_dir = mkpathdup("%s/.git", dir);
 914         }
 915
 916         atexit(remove_junk);
 917         sigchain_push_common(remove_junk_on_signal);
 918
 919         if (!option_bare) {
 920                 if (safe_create_leading_directories_const(work_tree) < 0)
 921                         die_errno(_("could not create leading directories of '%s'"),
 922                                   work_tree);
 923                 if (!dest_exists && mkdir(work_tree, 0777))
 924                         die_errno(_("could not create work tree dir '%s'"),
 925                                   work_tree);
 926                 junk_work_tree = work_tree;
 927                 set_git_work_tree(work_tree);
 928         }
 929
 930         junk_git_dir = git_dir;
 931         if (safe_create_leading_directories_const(git_dir) < 0)
 932                 die(_("could not create leading directories of '%s'"), git_dir);
 933
 934         set_git_dir_init(git_dir, real_git_dir, 0);
 935         if (real_git_dir) {
 936                 git_dir = real_git_dir;
 937                 junk_git_dir = real_git_dir;
 938         }
 939
 940         if (0 <= option_verbosity) {
 941                 if (option_bare)
 942                         fprintf(stderr, _("Cloning into bare repository '%s'...\n"), dir);
 943                 else
 944                         fprintf(stderr, _("Cloning into '%s'...\n"), dir);
 945         }
 946         init_db(option_template, INIT_DB_QUIET);
 947         write_config(&option_config);
 948
 949         git_config(git_default_config, NULL);
 950
 951         if (option_bare) {
 952                 if (option_mirror)
 953                         src_ref_prefix = "refs/";
 954                 strbuf_addstr(&branch_top, src_ref_prefix);
 955
 956                 git_config_set("core.bare", "true");
 957         } else {
 958                 strbuf_addf(&branch_top, "refs/remotes/%s/", option_origin);
 959         }
 960
 961         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top.buf);
 962         strbuf_addf(&key, "remote.%s.url", option_origin);
 963         git_config_set(key.buf, repo);
 964         strbuf_reset(&key);
 965
 966         if (option_reference.nr)
 967                 setup_reference();
 968
 969         fetch_pattern = value.buf;
 970         refspec = parse_fetch_refspec(1, &fetch_pattern);
 971
 972         strbuf_reset(&value);
 973
 974         remote = remote_get(option_origin);
 975         transport = transport_get(remote, remote->url[0]);
 976         transport_set_verbosity(transport, option_verbosity, option_progress);
 977
 978         path = get_repo_path(remote->url[0], &is_bundle);
 979         is_local = option_local != 0 && path && !is_bundle;
 980         if (is_local) {
 981                 if (option_depth)
 982                         warning(_("--depth is ignored in local clones; use file:// instead."));
 983                 if (!access(mkpath("%s/shallow", path), F_OK)) {
 984                         if (option_local > 0)
 985                                 warning(_("source repository is shallow, ignoring --local"));
 986                         is_local = 0;
 987                 }
 988         }
 989         if (option_local > 0 && !is_local)
 990                 warning(_("--local is ignored"));
 991         transport->cloning = 1;
 992
 993         if (!transport->get_refs_list || (!is_local && !transport->fetch))
 994                 die(_("Don't know how to clone %s"), transport->url);
 995
 996         transport_set_option(transport, TRANS_OPT_KEEP, "yes");
 997
 998         if (option_depth)
 999                 transport_set_option(transport, TRANS_OPT_DEPTH,
1000                                      option_depth);
1001         if (option_single_branch)
1002                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
1003
1004         if (option_upload_pack)
1005                 transport_set_option(transport, TRANS_OPT_UPLOADPACK,
1006                                      option_upload_pack);
1007
1008         if (transport->smart_options && !option_depth)
1009                 transport->smart_options->check_self_contained_and_connected = 1;
1010
1011         refs = transport_get_remote_refs(transport);
1012
1013         if (refs) {
1014                 mapped_refs = wanted_peer_refs(refs, refspec);
1015                 /*
1016                  * transport_get_remote_refs() may return refs with null sha-1
1017                  * in mapped_refs (see struct transport->get_refs_list
1018                  * comment). In that case we need fetch it early because
1019                  * remote_head code below relies on it.
1020                  *
1021                  * for normal clones, transport_get_remote_refs() should
1022                  * return reliable ref set, we can delay cloning until after
1023                  * remote HEAD check.
1024                  */
1025                 for (ref = refs; ref; ref = ref->next)
1026                         if (is_null_oid(&ref->old_oid)) {
1027                                 complete_refs_before_fetch = 0;
1028                                 break;
1029                         }
1030
1031                 if (!is_local && !complete_refs_before_fetch)
1032                         transport_fetch_refs(transport, mapped_refs);
1033
1034                 remote_head = find_ref_by_name(refs, "HEAD");
1035                 remote_head_points_at =
1036                         guess_remote_head(remote_head, mapped_refs, 0);
1037
1038                 if (option_branch) {
1039                         our_head_points_at =
1040                                 find_remote_branch(mapped_refs, option_branch);
1041
1042                         if (!our_head_points_at)
1043                                 die(_("Remote branch %s not found in upstream %s"),
1044                                     option_branch, option_origin);
1045                 }
1046                 else
1047                         our_head_points_at = remote_head_points_at;
1048         }
1049         else {
1050                 if (option_branch)
1051                         die(_("Remote branch %s not found in upstream %s"),
1052                                         option_branch, option_origin);
1053
1054                 warning(_("You appear to have cloned an empty repository."));
1055                 mapped_refs = NULL;
1056                 our_head_points_at = NULL;
1057                 remote_head_points_at = NULL;
1058                 remote_head = NULL;
1059                 option_no_checkout = 1;
1060                 if (!option_bare)
1061                         install_branch_config(0, "master", option_origin,
1062                                               "refs/heads/master");
1063         }
1064
1065         write_refspec_config(src_ref_prefix, our_head_points_at,
1066                         remote_head_points_at, &branch_top);
1067
1068         if (is_local)
1069                 clone_local(path, git_dir);
1070         else if (refs && complete_refs_before_fetch)
1071                 transport_fetch_refs(transport, mapped_refs);
1072
1073         update_remote_refs(refs, mapped_refs, remote_head_points_at,
1074                            branch_top.buf, reflog_msg.buf, transport, !is_local);
1075
1076         update_head(our_head_points_at, remote_head, reflog_msg.buf);
1077
1078         transport_unlock_pack(transport);
1079         transport_disconnect(transport);
1080
1081         if (option_dissociate) {
1082                 close_all_packs();
1083                 dissociate_from_references();
1084         }
1085
1086         junk_mode = JUNK_LEAVE_REPO;
1087         err = checkout();
1088
1089         strbuf_release(&reflog_msg);
1090         strbuf_release(&branch_top);
1091         strbuf_release(&key);
1092         strbuf_release(&value);
1093         junk_mode = JUNK_LEAVE_ALL;
1094
1095         free(refspec);
1096         return err;
1097 }