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 int option_shallow_submodules;
  44 static int deepen;
  45 static char *option_template, *option_depth, *option_since;
  46 static char *option_origin = NULL;
  47 static char *option_branch = NULL;
  48 static struct string_list option_not = STRING_LIST_INIT_NODUP;
  49 static const char *real_git_dir;
  50 static char *option_upload_pack = "git-upload-pack";
  51 static int option_verbosity;
  52 static int option_progress = -1;
  53 static enum transport_family family;
  54 static struct string_list option_config = STRING_LIST_INIT_NODUP;
  55 static struct string_list option_required_reference = STRING_LIST_INIT_NODUP;
  56 static struct string_list option_optional_reference = STRING_LIST_INIT_NODUP;
  57 static int option_dissociate;
  58 static int max_jobs = -1;
  59
  60 static struct option builtin_clone_options[] = {
  61         OPT__VERBOSITY(&option_verbosity),
  62         OPT_BOOL(0, "progress", &option_progress,
  63                  N_("force progress reporting")),
  64         OPT_BOOL('n', "no-checkout", &option_no_checkout,
  65                  N_("don't create a checkout")),
  66         OPT_BOOL(0, "bare", &option_bare, N_("create a bare repository")),
  67         OPT_HIDDEN_BOOL(0, "naked", &option_bare,
  68                         N_("create a bare repository")),
  69         OPT_BOOL(0, "mirror", &option_mirror,
  70                  N_("create a mirror repository (implies bare)")),
  71         OPT_BOOL('l', "local", &option_local,
  72                 N_("to clone from a local repository")),
  73         OPT_BOOL(0, "no-hardlinks", &option_no_hardlinks,
  74                     N_("don't use local hardlinks, always copy")),
  75         OPT_BOOL('s', "shared", &option_shared,
  76                     N_("setup as shared repository")),
  77         OPT_BOOL(0, "recursive", &option_recursive,
  78                     N_("initialize submodules in the clone")),
  79         OPT_BOOL(0, "recurse-submodules", &option_recursive,
  80                     N_("initialize submodules in the clone")),
  81         OPT_INTEGER('j', "jobs", &max_jobs,
  82                     N_("number of submodules cloned in parallel")),
  83         OPT_STRING(0, "template", &option_template, N_("template-directory"),
  84                    N_("directory from which templates will be used")),
  85         OPT_STRING_LIST(0, "reference", &option_required_reference, N_("repo"),
  86                         N_("reference repository")),
  87         OPT_STRING_LIST(0, "reference-if-able", &option_optional_reference,
  88                         N_("repo"), N_("reference repository")),
  89         OPT_BOOL(0, "dissociate", &option_dissociate,
  90                  N_("use --reference only while cloning")),
  91         OPT_STRING('o', "origin", &option_origin, N_("name"),
  92                    N_("use <name> instead of 'origin' to track upstream")),
  93         OPT_STRING('b', "branch", &option_branch, N_("branch"),
  94                    N_("checkout <branch> instead of the remote's HEAD")),
  95         OPT_STRING('u', "upload-pack", &option_upload_pack, N_("path"),
  96                    N_("path to git-upload-pack on the remote")),
  97         OPT_STRING(0, "depth", &option_depth, N_("depth"),
  98                     N_("create a shallow clone of that depth")),
  99         OPT_STRING(0, "shallow-since", &option_since, N_("time"),
 100                     N_("create a shallow clone since a specific time")),
 101         OPT_STRING_LIST(0, "shallow-exclude", &option_not, N_("revision"),
 102                         N_("deepen history of shallow clone by excluding rev")),
 103         OPT_BOOL(0, "single-branch", &option_single_branch,
 104                     N_("clone only one branch, HEAD or --branch")),
 105         OPT_BOOL(0, "shallow-submodules", &option_shallow_submodules,
 106                     N_("any cloned submodules will be shallow")),
 107         OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
 108                    N_("separate git dir from working tree")),
 109         OPT_STRING_LIST('c', "config", &option_config, N_("key=value"),
 110                         N_("set config inside the new repository")),
 111         OPT_SET_INT('4', "ipv4", &family, N_("use IPv4 addresses only"),
 112                         TRANSPORT_FAMILY_IPV4),
 113         OPT_SET_INT('6', "ipv6", &family, N_("use IPv6 addresses only"),
 114                         TRANSPORT_FAMILY_IPV6),
 115         OPT_END()
 116 };
 117
 118 static const char *get_repo_path_1(struct strbuf *path, int *is_bundle)
 119 {
 120         static char *suffix[] = { "/.git", "", ".git/.git", ".git" };
 121         static char *bundle_suffix[] = { ".bundle", "" };
 122         size_t baselen = path->len;
 123         struct stat st;
 124         int i;
 125
 126         for (i = 0; i < ARRAY_SIZE(suffix); i++) {
 127                 strbuf_setlen(path, baselen);
 128                 strbuf_addstr(path, suffix[i]);
 129                 if (stat(path->buf, &st))
 130                         continue;
 131                 if (S_ISDIR(st.st_mode) && is_git_directory(path->buf)) {
 132                         *is_bundle = 0;
 133                         return path->buf;
 134                 } else if (S_ISREG(st.st_mode) && st.st_size > 8) {
 135                         /* Is it a "gitfile"? */
 136                         char signature[8];
 137                         const char *dst;
 138                         int len, fd = open(path->buf, O_RDONLY);
 139                         if (fd < 0)
 140                                 continue;
 141                         len = read_in_full(fd, signature, 8);
 142                         close(fd);
 143                         if (len != 8 || strncmp(signature, "gitdir: ", 8))
 144                                 continue;
 145                         dst = read_gitfile(path->buf);
 146                         if (dst) {
 147                                 *is_bundle = 0;
 148                                 return dst;
 149                         }
 150                 }
 151         }
 152
 153         for (i = 0; i < ARRAY_SIZE(bundle_suffix); i++) {
 154                 strbuf_setlen(path, baselen);
 155                 strbuf_addstr(path, bundle_suffix[i]);
 156                 if (!stat(path->buf, &st) && S_ISREG(st.st_mode)) {
 157                         *is_bundle = 1;
 158                         return path->buf;
 159                 }
 160         }
 161
 162         return NULL;
 163 }
 164
 165 static char *get_repo_path(const char *repo, int *is_bundle)
 166 {
 167         struct strbuf path = STRBUF_INIT;
 168         const char *raw;
 169         char *canon;
 170
 171         strbuf_addstr(&path, repo);
 172         raw = get_repo_path_1(&path, is_bundle);
 173         canon = raw ? xstrdup(absolute_path(raw)) : NULL;
 174         strbuf_release(&path);
 175         return canon;
 176 }
 177
 178 static char *guess_dir_name(const char *repo, int is_bundle, int is_bare)
 179 {
 180         const char *end = repo + strlen(repo), *start, *ptr;
 181         size_t len;
 182         char *dir;
 183
 184         /*
 185          * Skip scheme.
 186          */
 187         start = strstr(repo, "://");
 188         if (start == NULL)
 189                 start = repo;
 190         else
 191                 start += 3;
 192
 193         /*
 194          * Skip authentication data. The stripping does happen
 195          * greedily, such that we strip up to the last '@' inside
 196          * the host part.
 197          */
 198         for (ptr = start; ptr < end && !is_dir_sep(*ptr); ptr++) {
 199                 if (*ptr == '@')
 200                         start = ptr + 1;
 201         }
 202
 203         /*
 204          * Strip trailing spaces, slashes and /.git
 205          */
 206         while (start < end && (is_dir_sep(end[-1]) || isspace(end[-1])))
 207                 end--;
 208         if (end - start > 5 && is_dir_sep(end[-5]) &&
 209             !strncmp(end - 4, ".git", 4)) {
 210                 end -= 5;
 211                 while (start < end && is_dir_sep(end[-1]))
 212                         end--;
 213         }
 214
 215         /*
 216          * Strip trailing port number if we've got only a
 217          * hostname (that is, there is no dir separator but a
 218          * colon). This check is required such that we do not
 219          * strip URI's like '/foo/bar:2222.git', which should
 220          * result in a dir '2222' being guessed due to backwards
 221          * compatibility.
 222          */
 223         if (memchr(start, '/', end - start) == NULL
 224             && memchr(start, ':', end - start) != NULL) {
 225                 ptr = end;
 226                 while (start < ptr && isdigit(ptr[-1]) && ptr[-1] != ':')
 227                         ptr--;
 228                 if (start < ptr && ptr[-1] == ':')
 229                         end = ptr - 1;
 230         }
 231
 232         /*
 233          * Find last component. To remain backwards compatible we
 234          * also regard colons as path separators, such that
 235          * cloning a repository 'foo:bar.git' would result in a
 236          * directory 'bar' being guessed.
 237          */
 238         ptr = end;
 239         while (start < ptr && !is_dir_sep(ptr[-1]) && ptr[-1] != ':')
 240                 ptr--;
 241         start = ptr;
 242
 243         /*
 244          * Strip .{bundle,git}.
 245          */
 246         len = end - start;
 247         strip_suffix_mem(start, &len, is_bundle ? ".bundle" : ".git");
 248
 249         if (!len || (len == 1 && *start == '/'))
 250                 die(_("No directory name could be guessed.\n"
 251                       "Please specify a directory on the command line"));
 252
 253         if (is_bare)
 254                 dir = xstrfmt("%.*s.git", (int)len, start);
 255         else
 256                 dir = xstrndup(start, len);
 257         /*
 258          * Replace sequences of 'control' characters and whitespace
 259          * with one ascii space, remove leading and trailing spaces.
 260          */
 261         if (*dir) {
 262                 char *out = dir;
 263                 int prev_space = 1 /* strip leading whitespace */;
 264                 for (end = dir; *end; ++end) {
 265                         char ch = *end;
 266                         if ((unsigned char)ch < '\x20')
 267                                 ch = '\x20';
 268                         if (isspace(ch)) {
 269                                 if (prev_space)
 270                                         continue;
 271                                 prev_space = 1;
 272                         } else
 273                                 prev_space = 0;
 274                         *out++ = ch;
 275                 }
 276                 *out = '\0';
 277                 if (out > dir && prev_space)
 278                         out[-1] = '\0';
 279         }
 280         return dir;
 281 }
 282
 283 static void strip_trailing_slashes(char *dir)
 284 {
 285         char *end = dir + strlen(dir);
 286
 287         while (dir < end - 1 && is_dir_sep(end[-1]))
 288                 end--;
 289         *end = '\0';
 290 }
 291
 292 static int add_one_reference(struct string_list_item *item, void *cb_data)
 293 {
 294         struct strbuf err = STRBUF_INIT;
 295         int *required = cb_data;
 296         char *ref_git = compute_alternate_path(item->string, &err);
 297
 298         if (!ref_git) {
 299                 if (*required)
 300                         die("%s", err.buf);
 301                 else
 302                         fprintf(stderr,
 303                                 _("info: Could not add alternate for '%s': %s\n"),
 304                                 item->string, err.buf);
 305         } else {
 306                 struct strbuf sb = STRBUF_INIT;
 307                 strbuf_addf(&sb, "%s/objects", ref_git);
 308                 add_to_alternates_file(sb.buf);
 309                 strbuf_release(&sb);
 310         }
 311
 312         strbuf_release(&err);
 313         free(ref_git);
 314         return 0;
 315 }
 316
 317 static void setup_reference(void)
 318 {
 319         int required = 1;
 320         for_each_string_list(&option_required_reference,
 321                              add_one_reference, &required);
 322         required = 0;
 323         for_each_string_list(&option_optional_reference,
 324                              add_one_reference, &required);
 325 }
 326
 327 static void copy_alternates(struct strbuf *src, struct strbuf *dst,
 328                             const char *src_repo)
 329 {
 330         /*
 331          * Read from the source objects/info/alternates file
 332          * and copy the entries to corresponding file in the
 333          * destination repository with add_to_alternates_file().
 334          * Both src and dst have "$path/objects/info/alternates".
 335          *
 336          * Instead of copying bit-for-bit from the original,
 337          * we need to append to existing one so that the already
 338          * created entry via "clone -s" is not lost, and also
 339          * to turn entries with paths relative to the original
 340          * absolute, so that they can be used in the new repository.
 341          */
 342         FILE *in = fopen(src->buf, "r");
 343         struct strbuf line = STRBUF_INIT;
 344
 345         while (strbuf_getline(&line, in) != EOF) {
 346                 char *abs_path;
 347                 if (!line.len || line.buf[0] == '#')
 348                         continue;
 349                 if (is_absolute_path(line.buf)) {
 350                         add_to_alternates_file(line.buf);
 351                         continue;
 352                 }
 353                 abs_path = mkpathdup("%s/objects/%s", src_repo, line.buf);
 354                 normalize_path_copy(abs_path, abs_path);
 355                 add_to_alternates_file(abs_path);
 356                 free(abs_path);
 357         }
 358         strbuf_release(&line);
 359         fclose(in);
 360 }
 361
 362 static void copy_or_link_directory(struct strbuf *src, struct strbuf *dest,
 363                                    const char *src_repo, int src_baselen)
 364 {
 365         struct dirent *de;
 366         struct stat buf;
 367         int src_len, dest_len;
 368         DIR *dir;
 369
 370         dir = opendir(src->buf);
 371         if (!dir)
 372                 die_errno(_("failed to open '%s'"), src->buf);
 373
 374         if (mkdir(dest->buf, 0777)) {
 375                 if (errno != EEXIST)
 376                         die_errno(_("failed to create directory '%s'"), dest->buf);
 377                 else if (stat(dest->buf, &buf))
 378                         die_errno(_("failed to stat '%s'"), dest->buf);
 379                 else if (!S_ISDIR(buf.st_mode))
 380                         die(_("%s exists and is not a directory"), dest->buf);
 381         }
 382
 383         strbuf_addch(src, '/');
 384         src_len = src->len;
 385         strbuf_addch(dest, '/');
 386         dest_len = dest->len;
 387
 388         while ((de = readdir(dir)) != NULL) {
 389                 strbuf_setlen(src, src_len);
 390                 strbuf_addstr(src, de->d_name);
 391                 strbuf_setlen(dest, dest_len);
 392                 strbuf_addstr(dest, de->d_name);
 393                 if (stat(src->buf, &buf)) {
 394                         warning (_("failed to stat %s\n"), src->buf);
 395                         continue;
 396                 }
 397                 if (S_ISDIR(buf.st_mode)) {
 398                         if (de->d_name[0] != '.')
 399                                 copy_or_link_directory(src, dest,
 400                                                        src_repo, src_baselen);
 401                         continue;
 402                 }
 403
 404                 /* Files that cannot be copied bit-for-bit... */
 405                 if (!strcmp(src->buf + src_baselen, "/info/alternates")) {
 406                         copy_alternates(src, dest, src_repo);
 407                         continue;
 408                 }
 409
 410                 if (unlink(dest->buf) && errno != ENOENT)
 411                         die_errno(_("failed to unlink '%s'"), dest->buf);
 412                 if (!option_no_hardlinks) {
 413                         if (!link(src->buf, dest->buf))
 414                                 continue;
 415                         if (option_local > 0)
 416                                 die_errno(_("failed to create link '%s'"), dest->buf);
 417                         option_no_hardlinks = 1;
 418                 }
 419                 if (copy_file_with_time(dest->buf, src->buf, 0666))
 420                         die_errno(_("failed to copy file to '%s'"), dest->buf);
 421         }
 422         closedir(dir);
 423 }
 424
 425 static void clone_local(const char *src_repo, const char *dest_repo)
 426 {
 427         if (option_shared) {
 428                 struct strbuf alt = STRBUF_INIT;
 429                 strbuf_addf(&alt, "%s/objects", src_repo);
 430                 add_to_alternates_file(alt.buf);
 431                 strbuf_release(&alt);
 432         } else {
 433                 struct strbuf src = STRBUF_INIT;
 434                 struct strbuf dest = STRBUF_INIT;
 435                 get_common_dir(&src, src_repo);
 436                 get_common_dir(&dest, dest_repo);
 437                 strbuf_addstr(&src, "/objects");
 438                 strbuf_addstr(&dest, "/objects");
 439                 copy_or_link_directory(&src, &dest, src_repo, src.len);
 440                 strbuf_release(&src);
 441                 strbuf_release(&dest);
 442         }
 443
 444         if (0 <= option_verbosity)
 445                 fprintf(stderr, _("done.\n"));
 446 }
 447
 448 static const char *junk_work_tree;
 449 static const char *junk_git_dir;
 450 static enum {
 451         JUNK_LEAVE_NONE,
 452         JUNK_LEAVE_REPO,
 453         JUNK_LEAVE_ALL
 454 } junk_mode = JUNK_LEAVE_NONE;
 455
 456 static const char junk_leave_repo_msg[] =
 457 N_("Clone succeeded, but checkout failed.\n"
 458    "You can inspect what was checked out with 'git status'\n"
 459    "and retry the checkout with 'git checkout -f HEAD'\n");
 460
 461 static void remove_junk(void)
 462 {
 463         struct strbuf sb = STRBUF_INIT;
 464
 465         switch (junk_mode) {
 466         case JUNK_LEAVE_REPO:
 467                 warning("%s", _(junk_leave_repo_msg));
 468                 /* fall-through */
 469         case JUNK_LEAVE_ALL:
 470                 return;
 471         default:
 472                 /* proceed to removal */
 473                 break;
 474         }
 475
 476         if (junk_git_dir) {
 477                 strbuf_addstr(&sb, junk_git_dir);
 478                 remove_dir_recursively(&sb, 0);
 479                 strbuf_reset(&sb);
 480         }
 481         if (junk_work_tree) {
 482                 strbuf_addstr(&sb, junk_work_tree);
 483                 remove_dir_recursively(&sb, 0);
 484                 strbuf_reset(&sb);
 485         }
 486 }
 487
 488 static void remove_junk_on_signal(int signo)
 489 {
 490         remove_junk();
 491         sigchain_pop(signo);
 492         raise(signo);
 493 }
 494
 495 static struct ref *find_remote_branch(const struct ref *refs, const char *branch)
 496 {
 497         struct ref *ref;
 498         struct strbuf head = STRBUF_INIT;
 499         strbuf_addstr(&head, "refs/heads/");
 500         strbuf_addstr(&head, branch);
 501         ref = find_ref_by_name(refs, head.buf);
 502         strbuf_release(&head);
 503
 504         if (ref)
 505                 return ref;
 506
 507         strbuf_addstr(&head, "refs/tags/");
 508         strbuf_addstr(&head, branch);
 509         ref = find_ref_by_name(refs, head.buf);
 510         strbuf_release(&head);
 511
 512         return ref;
 513 }
 514
 515 static struct ref *wanted_peer_refs(const struct ref *refs,
 516                 struct refspec *refspec)
 517 {
 518         struct ref *head = copy_ref(find_ref_by_name(refs, "HEAD"));
 519         struct ref *local_refs = head;
 520         struct ref **tail = head ? &head->next : &local_refs;
 521
 522         if (option_single_branch) {
 523                 struct ref *remote_head = NULL;
 524
 525                 if (!option_branch)
 526                         remote_head = guess_remote_head(head, refs, 0);
 527                 else {
 528                         local_refs = NULL;
 529                         tail = &local_refs;
 530                         remote_head = copy_ref(find_remote_branch(refs, option_branch));
 531                 }
 532
 533                 if (!remote_head && option_branch)
 534                         warning(_("Could not find remote branch %s to clone."),
 535                                 option_branch);
 536                 else {
 537                         get_fetch_map(remote_head, refspec, &tail, 0);
 538
 539                         /* if --branch=tag, pull the requested tag explicitly */
 540                         get_fetch_map(remote_head, tag_refspec, &tail, 0);
 541                 }
 542         } else
 543                 get_fetch_map(refs, refspec, &tail, 0);
 544
 545         if (!option_mirror && !option_single_branch)
 546                 get_fetch_map(refs, tag_refspec, &tail, 0);
 547
 548         return local_refs;
 549 }
 550
 551 static void write_remote_refs(const struct ref *local_refs)
 552 {
 553         const struct ref *r;
 554
 555         struct ref_transaction *t;
 556         struct strbuf err = STRBUF_INIT;
 557
 558         t = ref_transaction_begin(&err);
 559         if (!t)
 560                 die("%s", err.buf);
 561
 562         for (r = local_refs; r; r = r->next) {
 563                 if (!r->peer_ref)
 564                         continue;
 565                 if (ref_transaction_create(t, r->peer_ref->name, r->old_oid.hash,
 566                                            0, NULL, &err))
 567                         die("%s", err.buf);
 568         }
 569
 570         if (initial_ref_transaction_commit(t, &err))
 571                 die("%s", err.buf);
 572
 573         strbuf_release(&err);
 574         ref_transaction_free(t);
 575 }
 576
 577 static void write_followtags(const struct ref *refs, const char *msg)
 578 {
 579         const struct ref *ref;
 580         for (ref = refs; ref; ref = ref->next) {
 581                 if (!starts_with(ref->name, "refs/tags/"))
 582                         continue;
 583                 if (ends_with(ref->name, "^{}"))
 584                         continue;
 585                 if (!has_object_file(&ref->old_oid))
 586                         continue;
 587                 update_ref(msg, ref->name, ref->old_oid.hash,
 588                            NULL, 0, UPDATE_REFS_DIE_ON_ERR);
 589         }
 590 }
 591
 592 static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
 593 {
 594         struct ref **rm = cb_data;
 595         struct ref *ref = *rm;
 596
 597         /*
 598          * Skip anything missing a peer_ref, which we are not
 599          * actually going to write a ref for.
 600          */
 601         while (ref && !ref->peer_ref)
 602                 ref = ref->next;
 603         /* Returning -1 notes "end of list" to the caller. */
 604         if (!ref)
 605                 return -1;
 606
 607         hashcpy(sha1, ref->old_oid.hash);
 608         *rm = ref->next;
 609         return 0;
 610 }
 611
 612 static void update_remote_refs(const struct ref *refs,
 613                                const struct ref *mapped_refs,
 614                                const struct ref *remote_head_points_at,
 615                                const char *branch_top,
 616                                const char *msg,
 617                                struct transport *transport,
 618                                int check_connectivity)
 619 {
 620         const struct ref *rm = mapped_refs;
 621
 622         if (check_connectivity) {
 623                 struct check_connected_options opt = CHECK_CONNECTED_INIT;
 624
 625                 opt.transport = transport;
 626                 opt.progress = transport->progress;
 627
 628                 if (check_connected(iterate_ref_map, &rm, &opt))
 629                         die(_("remote did not send all necessary objects"));
 630         }
 631
 632         if (refs) {
 633                 write_remote_refs(mapped_refs);
 634                 if (option_single_branch)
 635                         write_followtags(refs, msg);
 636         }
 637
 638         if (remote_head_points_at && !option_bare) {
 639                 struct strbuf head_ref = STRBUF_INIT;
 640                 strbuf_addstr(&head_ref, branch_top);
 641                 strbuf_addstr(&head_ref, "HEAD");
 642                 if (create_symref(head_ref.buf,
 643                                   remote_head_points_at->peer_ref->name,
 644                                   msg) < 0)
 645                         die(_("unable to update %s"), head_ref.buf);
 646                 strbuf_release(&head_ref);
 647         }
 648 }
 649
 650 static void update_head(const struct ref *our, const struct ref *remote,
 651                         const char *msg)
 652 {
 653         const char *head;
 654         if (our && skip_prefix(our->name, "refs/heads/", &head)) {
 655                 /* Local default branch link */
 656                 if (create_symref("HEAD", our->name, NULL) < 0)
 657                         die(_("unable to update HEAD"));
 658                 if (!option_bare) {
 659                         update_ref(msg, "HEAD", our->old_oid.hash, NULL, 0,
 660                                    UPDATE_REFS_DIE_ON_ERR);
 661                         install_branch_config(0, head, option_origin, our->name);
 662                 }
 663         } else if (our) {
 664                 struct commit *c = lookup_commit_reference(our->old_oid.hash);
 665                 /* --branch specifies a non-branch (i.e. tags), detach HEAD */
 666                 update_ref(msg, "HEAD", c->object.oid.hash,
 667                            NULL, REF_NODEREF, UPDATE_REFS_DIE_ON_ERR);
 668         } else if (remote) {
 669                 /*
 670                  * We know remote HEAD points to a non-branch, or
 671                  * HEAD points to a branch but we don't know which one.
 672                  * Detach HEAD in all these cases.
 673                  */
 674                 update_ref(msg, "HEAD", remote->old_oid.hash,
 675                            NULL, REF_NODEREF, UPDATE_REFS_DIE_ON_ERR);
 676         }
 677 }
 678
 679 static int checkout(int submodule_progress)
 680 {
 681         unsigned char sha1[20];
 682         char *head;
 683         struct lock_file *lock_file;
 684         struct unpack_trees_options opts;
 685         struct tree *tree;
 686         struct tree_desc t;
 687         int err = 0;
 688
 689         if (option_no_checkout)
 690                 return 0;
 691
 692         head = resolve_refdup("HEAD", RESOLVE_REF_READING, sha1, NULL);
 693         if (!head) {
 694                 warning(_("remote HEAD refers to nonexistent ref, "
 695                           "unable to checkout.\n"));
 696                 return 0;
 697         }
 698         if (!strcmp(head, "HEAD")) {
 699                 if (advice_detached_head)
 700                         detach_advice(sha1_to_hex(sha1));
 701         } else {
 702                 if (!starts_with(head, "refs/heads/"))
 703                         die(_("HEAD not found below refs/heads!"));
 704         }
 705         free(head);
 706
 707         /* We need to be in the new work tree for the checkout */
 708         setup_work_tree();
 709
 710         lock_file = xcalloc(1, sizeof(struct lock_file));
 711         hold_locked_index(lock_file, 1);
 712
 713         memset(&opts, 0, sizeof opts);
 714         opts.update = 1;
 715         opts.merge = 1;
 716         opts.fn = oneway_merge;
 717         opts.verbose_update = (option_verbosity >= 0);
 718         opts.src_index = &the_index;
 719         opts.dst_index = &the_index;
 720
 721         tree = parse_tree_indirect(sha1);
 722         parse_tree(tree);
 723         init_tree_desc(&t, tree->buffer, tree->size);
 724         if (unpack_trees(1, &t, &opts) < 0)
 725                 die(_("unable to checkout working tree"));
 726
 727         if (write_locked_index(&the_index, lock_file, COMMIT_LOCK))
 728                 die(_("unable to write new index file"));
 729
 730         err |= run_hook_le(NULL, "post-checkout", sha1_to_hex(null_sha1),
 731                            sha1_to_hex(sha1), "1", NULL);
 732
 733         if (!err && option_recursive) {
 734                 struct argv_array args = ARGV_ARRAY_INIT;
 735                 argv_array_pushl(&args, "submodule", "update", "--init", "--recursive", NULL);
 736
 737                 if (option_shallow_submodules == 1)
 738                         argv_array_push(&args, "--depth=1");
 739
 740                 if (max_jobs != -1)
 741                         argv_array_pushf(&args, "--jobs=%d", max_jobs);
 742
 743                 if (submodule_progress)
 744                         argv_array_push(&args, "--progress");
 745
 746                 err = run_command_v_opt(args.argv, RUN_GIT_CMD);
 747                 argv_array_clear(&args);
 748         }
 749
 750         return err;
 751 }
 752
 753 static int write_one_config(const char *key, const char *value, void *data)
 754 {
 755         return git_config_set_multivar_gently(key, value ? value : "true", "^$", 0);
 756 }
 757
 758 static void write_config(struct string_list *config)
 759 {
 760         int i;
 761
 762         for (i = 0; i < config->nr; i++) {
 763                 if (git_config_parse_parameter(config->items[i].string,
 764                                                write_one_config, NULL) < 0)
 765                         die(_("unable to write parameters to config file"));
 766         }
 767 }
 768
 769 static void write_refspec_config(const char *src_ref_prefix,
 770                 const struct ref *our_head_points_at,
 771                 const struct ref *remote_head_points_at,
 772                 struct strbuf *branch_top)
 773 {
 774         struct strbuf key = STRBUF_INIT;
 775         struct strbuf value = STRBUF_INIT;
 776
 777         if (option_mirror || !option_bare) {
 778                 if (option_single_branch && !option_mirror) {
 779                         if (option_branch) {
 780                                 if (starts_with(our_head_points_at->name, "refs/tags/"))
 781                                         strbuf_addf(&value, "+%s:%s", our_head_points_at->name,
 782                                                 our_head_points_at->name);
 783                                 else
 784                                         strbuf_addf(&value, "+%s:%s%s", our_head_points_at->name,
 785                                                 branch_top->buf, option_branch);
 786                         } else if (remote_head_points_at) {
 787                                 const char *head = remote_head_points_at->name;
 788                                 if (!skip_prefix(head, "refs/heads/", &head))
 789                                         die("BUG: remote HEAD points at non-head?");
 790
 791                                 strbuf_addf(&value, "+%s:%s%s", remote_head_points_at->name,
 792                                                 branch_top->buf, head);
 793                         }
 794                         /*
 795                          * otherwise, the next "git fetch" will
 796                          * simply fetch from HEAD without updating
 797                          * any remote-tracking branch, which is what
 798                          * we want.
 799                          */
 800                 } else {
 801                         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top->buf);
 802                 }
 803                 /* Configure the remote */
 804                 if (value.len) {
 805                         strbuf_addf(&key, "remote.%s.fetch", option_origin);
 806                         git_config_set_multivar(key.buf, value.buf, "^$", 0);
 807                         strbuf_reset(&key);
 808
 809                         if (option_mirror) {
 810                                 strbuf_addf(&key, "remote.%s.mirror", option_origin);
 811                                 git_config_set(key.buf, "true");
 812                                 strbuf_reset(&key);
 813                         }
 814                 }
 815         }
 816
 817         strbuf_release(&key);
 818         strbuf_release(&value);
 819 }
 820
 821 static void dissociate_from_references(void)
 822 {
 823         static const char* argv[] = { "repack", "-a", "-d", NULL };
 824         char *alternates = git_pathdup("objects/info/alternates");
 825
 826         if (!access(alternates, F_OK)) {
 827                 if (run_command_v_opt(argv, RUN_GIT_CMD|RUN_COMMAND_NO_STDIN))
 828                         die(_("cannot repack to clean up"));
 829                 if (unlink(alternates) && errno != ENOENT)
 830                         die_errno(_("cannot unlink temporary alternates file"));
 831         }
 832         free(alternates);
 833 }
 834
 835 int cmd_clone(int argc, const char **argv, const char *prefix)
 836 {
 837         int is_bundle = 0, is_local;
 838         struct stat buf;
 839         const char *repo_name, *repo, *work_tree, *git_dir;
 840         char *path, *dir;
 841         int dest_exists;
 842         const struct ref *refs, *remote_head;
 843         const struct ref *remote_head_points_at;
 844         const struct ref *our_head_points_at;
 845         struct ref *mapped_refs;
 846         const struct ref *ref;
 847         struct strbuf key = STRBUF_INIT, value = STRBUF_INIT;
 848         struct strbuf branch_top = STRBUF_INIT, reflog_msg = STRBUF_INIT;
 849         struct transport *transport = NULL;
 850         const char *src_ref_prefix = "refs/heads/";
 851         struct remote *remote;
 852         int err = 0, complete_refs_before_fetch = 1;
 853         int submodule_progress;
 854
 855         struct refspec *refspec;
 856         const char *fetch_pattern;
 857
 858         packet_trace_identity("clone");
 859         argc = parse_options(argc, argv, prefix, builtin_clone_options,
 860                              builtin_clone_usage, 0);
 861
 862         if (argc > 2)
 863                 usage_msg_opt(_("Too many arguments."),
 864                         builtin_clone_usage, builtin_clone_options);
 865
 866         if (argc == 0)
 867                 usage_msg_opt(_("You must specify a repository to clone."),
 868                         builtin_clone_usage, builtin_clone_options);
 869
 870         if (option_depth || option_since || option_not.nr)
 871                 deepen = 1;
 872         if (option_single_branch == -1)
 873                 option_single_branch = deepen ? 1 : 0;
 874
 875         if (option_mirror)
 876                 option_bare = 1;
 877
 878         if (option_bare) {
 879                 if (option_origin)
 880                         die(_("--bare and --origin %s options are incompatible."),
 881                             option_origin);
 882                 if (real_git_dir)
 883                         die(_("--bare and --separate-git-dir are incompatible."));
 884                 option_no_checkout = 1;
 885         }
 886
 887         if (!option_origin)
 888                 option_origin = "origin";
 889
 890         repo_name = argv[0];
 891
 892         path = get_repo_path(repo_name, &is_bundle);
 893         if (path)
 894                 repo = xstrdup(absolute_path(repo_name));
 895         else if (!strchr(repo_name, ':'))
 896                 die(_("repository '%s' does not exist"), repo_name);
 897         else
 898                 repo = repo_name;
 899
 900         /* no need to be strict, transport_set_option() will validate it again */
 901         if (option_depth && atoi(option_depth) < 1)
 902                 die(_("depth %s is not a positive number"), option_depth);
 903
 904         if (argc == 2)
 905                 dir = xstrdup(argv[1]);
 906         else
 907                 dir = guess_dir_name(repo_name, is_bundle, option_bare);
 908         strip_trailing_slashes(dir);
 909
 910         dest_exists = !stat(dir, &buf);
 911         if (dest_exists && !is_empty_dir(dir))
 912                 die(_("destination path '%s' already exists and is not "
 913                         "an empty directory."), dir);
 914
 915         strbuf_addf(&reflog_msg, "clone: from %s", repo);
 916
 917         if (option_bare)
 918                 work_tree = NULL;
 919         else {
 920                 work_tree = getenv("GIT_WORK_TREE");
 921                 if (work_tree && !stat(work_tree, &buf))
 922                         die(_("working tree '%s' already exists."), work_tree);
 923         }
 924
 925         if (option_bare || work_tree)
 926                 git_dir = xstrdup(dir);
 927         else {
 928                 work_tree = dir;
 929                 git_dir = mkpathdup("%s/.git", dir);
 930         }
 931
 932         atexit(remove_junk);
 933         sigchain_push_common(remove_junk_on_signal);
 934
 935         if (!option_bare) {
 936                 if (safe_create_leading_directories_const(work_tree) < 0)
 937                         die_errno(_("could not create leading directories of '%s'"),
 938                                   work_tree);
 939                 if (!dest_exists && mkdir(work_tree, 0777))
 940                         die_errno(_("could not create work tree dir '%s'"),
 941                                   work_tree);
 942                 junk_work_tree = work_tree;
 943                 set_git_work_tree(work_tree);
 944         }
 945
 946         junk_git_dir = real_git_dir ? real_git_dir : git_dir;
 947         if (safe_create_leading_directories_const(git_dir) < 0)
 948                 die(_("could not create leading directories of '%s'"), git_dir);
 949
 950         if (0 <= option_verbosity) {
 951                 if (option_bare)
 952                         fprintf(stderr, _("Cloning into bare repository '%s'...\n"), dir);
 953                 else
 954                         fprintf(stderr, _("Cloning into '%s'...\n"), dir);
 955         }
 956
 957         if (option_recursive) {
 958                 if (option_required_reference.nr &&
 959                     option_optional_reference.nr)
 960                         die(_("clone --recursive is not compatible with "
 961                               "both --reference and --reference-if-able"));
 962                 else if (option_required_reference.nr) {
 963                         string_list_append(&option_config,
 964                                 "submodule.alternateLocation=superproject");
 965                         string_list_append(&option_config,
 966                                 "submodule.alternateErrorStrategy=die");
 967                 } else if (option_optional_reference.nr) {
 968                         string_list_append(&option_config,
 969                                 "submodule.alternateLocation=superproject");
 970                         string_list_append(&option_config,
 971                                 "submodule.alternateErrorStrategy=info");
 972                 }
 973         }
 974
 975         init_db(git_dir, real_git_dir, option_template, INIT_DB_QUIET);
 976
 977         if (real_git_dir)
 978                 git_dir = real_git_dir;
 979
 980         write_config(&option_config);
 981
 982         git_config(git_default_config, NULL);
 983
 984         if (option_bare) {
 985                 if (option_mirror)
 986                         src_ref_prefix = "refs/";
 987                 strbuf_addstr(&branch_top, src_ref_prefix);
 988
 989                 git_config_set("core.bare", "true");
 990         } else {
 991                 strbuf_addf(&branch_top, "refs/remotes/%s/", option_origin);
 992         }
 993
 994         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top.buf);
 995         strbuf_addf(&key, "remote.%s.url", option_origin);
 996         git_config_set(key.buf, repo);
 997         strbuf_reset(&key);
 998
 999         if (option_required_reference.nr || option_optional_reference.nr)
1000                 setup_reference();
1001
1002         fetch_pattern = value.buf;
1003         refspec = parse_fetch_refspec(1, &fetch_pattern);
1004
1005         strbuf_reset(&value);
1006
1007         remote = remote_get(option_origin);
1008         transport = transport_get(remote, remote->url[0]);
1009         transport_set_verbosity(transport, option_verbosity, option_progress);
1010         transport->family = family;
1011
1012         path = get_repo_path(remote->url[0], &is_bundle);
1013         is_local = option_local != 0 && path && !is_bundle;
1014         if (is_local) {
1015                 if (option_depth)
1016                         warning(_("--depth is ignored in local clones; use file:// instead."));
1017                 if (option_since)
1018                         warning(_("--shallow-since is ignored in local clones; use file:// instead."));
1019                 if (option_not.nr)
1020                         warning(_("--shallow-exclude is ignored in local clones; use file:// instead."));
1021                 if (!access(mkpath("%s/shallow", path), F_OK)) {
1022                         if (option_local > 0)
1023                                 warning(_("source repository is shallow, ignoring --local"));
1024                         is_local = 0;
1025                 }
1026         }
1027         if (option_local > 0 && !is_local)
1028                 warning(_("--local is ignored"));
1029         transport->cloning = 1;
1030
1031         if (!transport->get_refs_list || (!is_local && !transport->fetch))
1032                 die(_("Don't know how to clone %s"), transport->url);
1033
1034         transport_set_option(transport, TRANS_OPT_KEEP, "yes");
1035
1036         if (option_depth)
1037                 transport_set_option(transport, TRANS_OPT_DEPTH,
1038                                      option_depth);
1039         if (option_since)
1040                 transport_set_option(transport, TRANS_OPT_DEEPEN_SINCE,
1041                                      option_since);
1042         if (option_not.nr)
1043                 transport_set_option(transport, TRANS_OPT_DEEPEN_NOT,
1044                                      (const char *)&option_not);
1045         if (option_single_branch)
1046                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
1047
1048         if (option_upload_pack)
1049                 transport_set_option(transport, TRANS_OPT_UPLOADPACK,
1050                                      option_upload_pack);
1051
1052         if (transport->smart_options && !deepen)
1053                 transport->smart_options->check_self_contained_and_connected = 1;
1054
1055         refs = transport_get_remote_refs(transport);
1056
1057         if (refs) {
1058                 mapped_refs = wanted_peer_refs(refs, refspec);
1059                 /*
1060                  * transport_get_remote_refs() may return refs with null sha-1
1061                  * in mapped_refs (see struct transport->get_refs_list
1062                  * comment). In that case we need fetch it early because
1063                  * remote_head code below relies on it.
1064                  *
1065                  * for normal clones, transport_get_remote_refs() should
1066                  * return reliable ref set, we can delay cloning until after
1067                  * remote HEAD check.
1068                  */
1069                 for (ref = refs; ref; ref = ref->next)
1070                         if (is_null_oid(&ref->old_oid)) {
1071                                 complete_refs_before_fetch = 0;
1072                                 break;
1073                         }
1074
1075                 if (!is_local && !complete_refs_before_fetch)
1076                         transport_fetch_refs(transport, mapped_refs);
1077
1078                 remote_head = find_ref_by_name(refs, "HEAD");
1079                 remote_head_points_at =
1080                         guess_remote_head(remote_head, mapped_refs, 0);
1081
1082                 if (option_branch) {
1083                         our_head_points_at =
1084                                 find_remote_branch(mapped_refs, option_branch);
1085
1086                         if (!our_head_points_at)
1087                                 die(_("Remote branch %s not found in upstream %s"),
1088                                     option_branch, option_origin);
1089                 }
1090                 else
1091                         our_head_points_at = remote_head_points_at;
1092         }
1093         else {
1094                 if (option_branch)
1095                         die(_("Remote branch %s not found in upstream %s"),
1096                                         option_branch, option_origin);
1097
1098                 warning(_("You appear to have cloned an empty repository."));
1099                 mapped_refs = NULL;
1100                 our_head_points_at = NULL;
1101                 remote_head_points_at = NULL;
1102                 remote_head = NULL;
1103                 option_no_checkout = 1;
1104                 if (!option_bare)
1105                         install_branch_config(0, "master", option_origin,
1106                                               "refs/heads/master");
1107         }
1108
1109         write_refspec_config(src_ref_prefix, our_head_points_at,
1110                         remote_head_points_at, &branch_top);
1111
1112         if (is_local)
1113                 clone_local(path, git_dir);
1114         else if (refs && complete_refs_before_fetch)
1115                 transport_fetch_refs(transport, mapped_refs);
1116
1117         update_remote_refs(refs, mapped_refs, remote_head_points_at,
1118                            branch_top.buf, reflog_msg.buf, transport, !is_local);
1119
1120         update_head(our_head_points_at, remote_head, reflog_msg.buf);
1121
1122         /*
1123          * We want to show progress for recursive submodule clones iff
1124          * we did so for the main clone. But only the transport knows
1125          * the final decision for this flag, so we need to rescue the value
1126          * before we free the transport.
1127          */
1128         submodule_progress = transport->progress;
1129
1130         transport_unlock_pack(transport);
1131         transport_disconnect(transport);
1132
1133         if (option_dissociate) {
1134                 close_all_packs();
1135                 dissociate_from_references();
1136         }
1137
1138         junk_mode = JUNK_LEAVE_REPO;
1139         err = checkout(submodule_progress);
1140
1141         strbuf_release(&reflog_msg);
1142         strbuf_release(&branch_top);
1143         strbuf_release(&key);
1144         strbuf_release(&value);
1145         junk_mode = JUNK_LEAVE_ALL;
1146
1147         free(refspec);
1148         return err;
1149 }