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 "config.h"
  13 #include "lockfile.h"
  14 #include "parse-options.h"
  15 #include "fetch-pack.h"
  16 #include "refs.h"
  17 #include "tree.h"
  18 #include "tree-walk.h"
  19 #include "unpack-trees.h"
  20 #include "transport.h"
  21 #include "strbuf.h"
  22 #include "dir.h"
  23 #include "sigchain.h"
  24 #include "branch.h"
  25 #include "remote.h"
  26 #include "run-command.h"
  27 #include "connected.h"
  28
  29 /*
  30  * Overall FIXMEs:
  31  *  - respect DB_ENVIRONMENT for .git/objects.
  32  *
  33  * Implementation notes:
  34  *  - dropping use-separate-remote and no-separate-remote compatibility
  35  *
  36  */
  37 static const char * const builtin_clone_usage[] = {
  38         N_("git clone [<options>] [--] <repo> [<dir>]"),
  39         NULL
  40 };
  41
  42 static int option_no_checkout, option_bare, option_mirror, option_single_branch = -1;
  43 static int option_local = -1, option_no_hardlinks, option_shared;
  44 static int option_no_tags;
  45 static int option_shallow_submodules;
  46 static int deepen;
  47 static char *option_template, *option_depth, *option_since;
  48 static char *option_origin = NULL;
  49 static char *option_branch = NULL;
  50 static struct string_list option_not = STRING_LIST_INIT_NODUP;
  51 static const char *real_git_dir;
  52 static char *option_upload_pack = "git-upload-pack";
  53 static int option_verbosity;
  54 static int option_progress = -1;
  55 static enum transport_family family;
  56 static struct string_list option_config = STRING_LIST_INIT_NODUP;
  57 static struct string_list option_required_reference = STRING_LIST_INIT_NODUP;
  58 static struct string_list option_optional_reference = STRING_LIST_INIT_NODUP;
  59 static int option_dissociate;
  60 static int max_jobs = -1;
  61 static struct string_list option_recurse_submodules = STRING_LIST_INIT_NODUP;
  62
  63 static int recurse_submodules_cb(const struct option *opt,
  64                                  const char *arg, int unset)
  65 {
  66         if (unset)
  67                 string_list_clear((struct string_list *)opt->value, 0);
  68         else if (arg)
  69                 string_list_append((struct string_list *)opt->value, arg);
  70         else
  71                 string_list_append((struct string_list *)opt->value,
  72                                    (const char *)opt->defval);
  73
  74         return 0;
  75 }
  76
  77 static struct option builtin_clone_options[] = {
  78         OPT__VERBOSITY(&option_verbosity),
  79         OPT_BOOL(0, "progress", &option_progress,
  80                  N_("force progress reporting")),
  81         OPT_BOOL('n', "no-checkout", &option_no_checkout,
  82                  N_("don't create a checkout")),
  83         OPT_BOOL(0, "bare", &option_bare, N_("create a bare repository")),
  84         OPT_HIDDEN_BOOL(0, "naked", &option_bare,
  85                         N_("create a bare repository")),
  86         OPT_BOOL(0, "mirror", &option_mirror,
  87                  N_("create a mirror repository (implies bare)")),
  88         OPT_BOOL('l', "local", &option_local,
  89                 N_("to clone from a local repository")),
  90         OPT_BOOL(0, "no-hardlinks", &option_no_hardlinks,
  91                     N_("don't use local hardlinks, always copy")),
  92         OPT_BOOL('s', "shared", &option_shared,
  93                     N_("setup as shared repository")),
  94         { OPTION_CALLBACK, 0, "recursive", &option_recurse_submodules,
  95           N_("pathspec"), N_("initialize submodules in the clone"),
  96           PARSE_OPT_OPTARG | PARSE_OPT_HIDDEN, recurse_submodules_cb,
  97           (intptr_t)"." },
  98         { OPTION_CALLBACK, 0, "recurse-submodules", &option_recurse_submodules,
  99           N_("pathspec"), N_("initialize submodules in the clone"),
 100           PARSE_OPT_OPTARG, recurse_submodules_cb, (intptr_t)"." },
 101         OPT_INTEGER('j', "jobs", &max_jobs,
 102                     N_("number of submodules cloned in parallel")),
 103         OPT_STRING(0, "template", &option_template, N_("template-directory"),
 104                    N_("directory from which templates will be used")),
 105         OPT_STRING_LIST(0, "reference", &option_required_reference, N_("repo"),
 106                         N_("reference repository")),
 107         OPT_STRING_LIST(0, "reference-if-able", &option_optional_reference,
 108                         N_("repo"), N_("reference repository")),
 109         OPT_BOOL(0, "dissociate", &option_dissociate,
 110                  N_("use --reference only while cloning")),
 111         OPT_STRING('o', "origin", &option_origin, N_("name"),
 112                    N_("use <name> instead of 'origin' to track upstream")),
 113         OPT_STRING('b', "branch", &option_branch, N_("branch"),
 114                    N_("checkout <branch> instead of the remote's HEAD")),
 115         OPT_STRING('u', "upload-pack", &option_upload_pack, N_("path"),
 116                    N_("path to git-upload-pack on the remote")),
 117         OPT_STRING(0, "depth", &option_depth, N_("depth"),
 118                     N_("create a shallow clone of that depth")),
 119         OPT_STRING(0, "shallow-since", &option_since, N_("time"),
 120                     N_("create a shallow clone since a specific time")),
 121         OPT_STRING_LIST(0, "shallow-exclude", &option_not, N_("revision"),
 122                         N_("deepen history of shallow clone, excluding rev")),
 123         OPT_BOOL(0, "single-branch", &option_single_branch,
 124                     N_("clone only one branch, HEAD or --branch")),
 125         OPT_BOOL(0, "no-tags", &option_no_tags,
 126                  N_("don't clone any tags, and make later fetches not to follow them")),
 127         OPT_BOOL(0, "shallow-submodules", &option_shallow_submodules,
 128                     N_("any cloned submodules will be shallow")),
 129         OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
 130                    N_("separate git dir from working tree")),
 131         OPT_STRING_LIST('c', "config", &option_config, N_("key=value"),
 132                         N_("set config inside the new repository")),
 133         OPT_SET_INT('4', "ipv4", &family, N_("use IPv4 addresses only"),
 134                         TRANSPORT_FAMILY_IPV4),
 135         OPT_SET_INT('6', "ipv6", &family, N_("use IPv6 addresses only"),
 136                         TRANSPORT_FAMILY_IPV6),
 137         OPT_END()
 138 };
 139
 140 static const char *get_repo_path_1(struct strbuf *path, int *is_bundle)
 141 {
 142         static char *suffix[] = { "/.git", "", ".git/.git", ".git" };
 143         static char *bundle_suffix[] = { ".bundle", "" };
 144         size_t baselen = path->len;
 145         struct stat st;
 146         int i;
 147
 148         for (i = 0; i < ARRAY_SIZE(suffix); i++) {
 149                 strbuf_setlen(path, baselen);
 150                 strbuf_addstr(path, suffix[i]);
 151                 if (stat(path->buf, &st))
 152                         continue;
 153                 if (S_ISDIR(st.st_mode) && is_git_directory(path->buf)) {
 154                         *is_bundle = 0;
 155                         return path->buf;
 156                 } else if (S_ISREG(st.st_mode) && st.st_size > 8) {
 157                         /* Is it a "gitfile"? */
 158                         char signature[8];
 159                         const char *dst;
 160                         int len, fd = open(path->buf, O_RDONLY);
 161                         if (fd < 0)
 162                                 continue;
 163                         len = read_in_full(fd, signature, 8);
 164                         close(fd);
 165                         if (len != 8 || strncmp(signature, "gitdir: ", 8))
 166                                 continue;
 167                         dst = read_gitfile(path->buf);
 168                         if (dst) {
 169                                 *is_bundle = 0;
 170                                 return dst;
 171                         }
 172                 }
 173         }
 174
 175         for (i = 0; i < ARRAY_SIZE(bundle_suffix); i++) {
 176                 strbuf_setlen(path, baselen);
 177                 strbuf_addstr(path, bundle_suffix[i]);
 178                 if (!stat(path->buf, &st) && S_ISREG(st.st_mode)) {
 179                         *is_bundle = 1;
 180                         return path->buf;
 181                 }
 182         }
 183
 184         return NULL;
 185 }
 186
 187 static char *get_repo_path(const char *repo, int *is_bundle)
 188 {
 189         struct strbuf path = STRBUF_INIT;
 190         const char *raw;
 191         char *canon;
 192
 193         strbuf_addstr(&path, repo);
 194         raw = get_repo_path_1(&path, is_bundle);
 195         canon = raw ? absolute_pathdup(raw) : NULL;
 196         strbuf_release(&path);
 197         return canon;
 198 }
 199
 200 static char *guess_dir_name(const char *repo, int is_bundle, int is_bare)
 201 {
 202         const char *end = repo + strlen(repo), *start, *ptr;
 203         size_t len;
 204         char *dir;
 205
 206         /*
 207          * Skip scheme.
 208          */
 209         start = strstr(repo, "://");
 210         if (start == NULL)
 211                 start = repo;
 212         else
 213                 start += 3;
 214
 215         /*
 216          * Skip authentication data. The stripping does happen
 217          * greedily, such that we strip up to the last '@' inside
 218          * the host part.
 219          */
 220         for (ptr = start; ptr < end && !is_dir_sep(*ptr); ptr++) {
 221                 if (*ptr == '@')
 222                         start = ptr + 1;
 223         }
 224
 225         /*
 226          * Strip trailing spaces, slashes and /.git
 227          */
 228         while (start < end && (is_dir_sep(end[-1]) || isspace(end[-1])))
 229                 end--;
 230         if (end - start > 5 && is_dir_sep(end[-5]) &&
 231             !strncmp(end - 4, ".git", 4)) {
 232                 end -= 5;
 233                 while (start < end && is_dir_sep(end[-1]))
 234                         end--;
 235         }
 236
 237         /*
 238          * Strip trailing port number if we've got only a
 239          * hostname (that is, there is no dir separator but a
 240          * colon). This check is required such that we do not
 241          * strip URI's like '/foo/bar:2222.git', which should
 242          * result in a dir '2222' being guessed due to backwards
 243          * compatibility.
 244          */
 245         if (memchr(start, '/', end - start) == NULL
 246             && memchr(start, ':', end - start) != NULL) {
 247                 ptr = end;
 248                 while (start < ptr && isdigit(ptr[-1]) && ptr[-1] != ':')
 249                         ptr--;
 250                 if (start < ptr && ptr[-1] == ':')
 251                         end = ptr - 1;
 252         }
 253
 254         /*
 255          * Find last component. To remain backwards compatible we
 256          * also regard colons as path separators, such that
 257          * cloning a repository 'foo:bar.git' would result in a
 258          * directory 'bar' being guessed.
 259          */
 260         ptr = end;
 261         while (start < ptr && !is_dir_sep(ptr[-1]) && ptr[-1] != ':')
 262                 ptr--;
 263         start = ptr;
 264
 265         /*
 266          * Strip .{bundle,git}.
 267          */
 268         len = end - start;
 269         strip_suffix_mem(start, &len, is_bundle ? ".bundle" : ".git");
 270
 271         if (!len || (len == 1 && *start == '/'))
 272                 die(_("No directory name could be guessed.\n"
 273                       "Please specify a directory on the command line"));
 274
 275         if (is_bare)
 276                 dir = xstrfmt("%.*s.git", (int)len, start);
 277         else
 278                 dir = xstrndup(start, len);
 279         /*
 280          * Replace sequences of 'control' characters and whitespace
 281          * with one ascii space, remove leading and trailing spaces.
 282          */
 283         if (*dir) {
 284                 char *out = dir;
 285                 int prev_space = 1 /* strip leading whitespace */;
 286                 for (end = dir; *end; ++end) {
 287                         char ch = *end;
 288                         if ((unsigned char)ch < '\x20')
 289                                 ch = '\x20';
 290                         if (isspace(ch)) {
 291                                 if (prev_space)
 292                                         continue;
 293                                 prev_space = 1;
 294                         } else
 295                                 prev_space = 0;
 296                         *out++ = ch;
 297                 }
 298                 *out = '\0';
 299                 if (out > dir && prev_space)
 300                         out[-1] = '\0';
 301         }
 302         return dir;
 303 }
 304
 305 static void strip_trailing_slashes(char *dir)
 306 {
 307         char *end = dir + strlen(dir);
 308
 309         while (dir < end - 1 && is_dir_sep(end[-1]))
 310                 end--;
 311         *end = '\0';
 312 }
 313
 314 static int add_one_reference(struct string_list_item *item, void *cb_data)
 315 {
 316         struct strbuf err = STRBUF_INIT;
 317         int *required = cb_data;
 318         char *ref_git = compute_alternate_path(item->string, &err);
 319
 320         if (!ref_git) {
 321                 if (*required)
 322                         die("%s", err.buf);
 323                 else
 324                         fprintf(stderr,
 325                                 _("info: Could not add alternate for '%s': %s\n"),
 326                                 item->string, err.buf);
 327         } else {
 328                 struct strbuf sb = STRBUF_INIT;
 329                 strbuf_addf(&sb, "%s/objects", ref_git);
 330                 add_to_alternates_file(sb.buf);
 331                 strbuf_release(&sb);
 332         }
 333
 334         strbuf_release(&err);
 335         free(ref_git);
 336         return 0;
 337 }
 338
 339 static void setup_reference(void)
 340 {
 341         int required = 1;
 342         for_each_string_list(&option_required_reference,
 343                              add_one_reference, &required);
 344         required = 0;
 345         for_each_string_list(&option_optional_reference,
 346                              add_one_reference, &required);
 347 }
 348
 349 static void copy_alternates(struct strbuf *src, struct strbuf *dst,
 350                             const char *src_repo)
 351 {
 352         /*
 353          * Read from the source objects/info/alternates file
 354          * and copy the entries to corresponding file in the
 355          * destination repository with add_to_alternates_file().
 356          * Both src and dst have "$path/objects/info/alternates".
 357          *
 358          * Instead of copying bit-for-bit from the original,
 359          * we need to append to existing one so that the already
 360          * created entry via "clone -s" is not lost, and also
 361          * to turn entries with paths relative to the original
 362          * absolute, so that they can be used in the new repository.
 363          */
 364         FILE *in = xfopen(src->buf, "r");
 365         struct strbuf line = STRBUF_INIT;
 366
 367         while (strbuf_getline(&line, in) != EOF) {
 368                 char *abs_path;
 369                 if (!line.len || line.buf[0] == '#')
 370                         continue;
 371                 if (is_absolute_path(line.buf)) {
 372                         add_to_alternates_file(line.buf);
 373                         continue;
 374                 }
 375                 abs_path = mkpathdup("%s/objects/%s", src_repo, line.buf);
 376                 if (!normalize_path_copy(abs_path, abs_path))
 377                         add_to_alternates_file(abs_path);
 378                 else
 379                         warning("skipping invalid relative alternate: %s/%s",
 380                                 src_repo, line.buf);
 381                 free(abs_path);
 382         }
 383         strbuf_release(&line);
 384         fclose(in);
 385 }
 386
 387 static void copy_or_link_directory(struct strbuf *src, struct strbuf *dest,
 388                                    const char *src_repo, int src_baselen)
 389 {
 390         struct dirent *de;
 391         struct stat buf;
 392         int src_len, dest_len;
 393         DIR *dir;
 394
 395         dir = opendir(src->buf);
 396         if (!dir)
 397                 die_errno(_("failed to open '%s'"), src->buf);
 398
 399         if (mkdir(dest->buf, 0777)) {
 400                 if (errno != EEXIST)
 401                         die_errno(_("failed to create directory '%s'"), dest->buf);
 402                 else if (stat(dest->buf, &buf))
 403                         die_errno(_("failed to stat '%s'"), dest->buf);
 404                 else if (!S_ISDIR(buf.st_mode))
 405                         die(_("%s exists and is not a directory"), dest->buf);
 406         }
 407
 408         strbuf_addch(src, '/');
 409         src_len = src->len;
 410         strbuf_addch(dest, '/');
 411         dest_len = dest->len;
 412
 413         while ((de = readdir(dir)) != NULL) {
 414                 strbuf_setlen(src, src_len);
 415                 strbuf_addstr(src, de->d_name);
 416                 strbuf_setlen(dest, dest_len);
 417                 strbuf_addstr(dest, de->d_name);
 418                 if (stat(src->buf, &buf)) {
 419                         warning (_("failed to stat %s\n"), src->buf);
 420                         continue;
 421                 }
 422                 if (S_ISDIR(buf.st_mode)) {
 423                         if (de->d_name[0] != '.')
 424                                 copy_or_link_directory(src, dest,
 425                                                        src_repo, src_baselen);
 426                         continue;
 427                 }
 428
 429                 /* Files that cannot be copied bit-for-bit... */
 430                 if (!strcmp(src->buf + src_baselen, "/info/alternates")) {
 431                         copy_alternates(src, dest, src_repo);
 432                         continue;
 433                 }
 434
 435                 if (unlink(dest->buf) && errno != ENOENT)
 436                         die_errno(_("failed to unlink '%s'"), dest->buf);
 437                 if (!option_no_hardlinks) {
 438                         if (!link(src->buf, dest->buf))
 439                                 continue;
 440                         if (option_local > 0)
 441                                 die_errno(_("failed to create link '%s'"), dest->buf);
 442                         option_no_hardlinks = 1;
 443                 }
 444                 if (copy_file_with_time(dest->buf, src->buf, 0666))
 445                         die_errno(_("failed to copy file to '%s'"), dest->buf);
 446         }
 447         closedir(dir);
 448 }
 449
 450 static void clone_local(const char *src_repo, const char *dest_repo)
 451 {
 452         if (option_shared) {
 453                 struct strbuf alt = STRBUF_INIT;
 454                 strbuf_addf(&alt, "%s/objects", src_repo);
 455                 add_to_alternates_file(alt.buf);
 456                 strbuf_release(&alt);
 457         } else {
 458                 struct strbuf src = STRBUF_INIT;
 459                 struct strbuf dest = STRBUF_INIT;
 460                 get_common_dir(&src, src_repo);
 461                 get_common_dir(&dest, dest_repo);
 462                 strbuf_addstr(&src, "/objects");
 463                 strbuf_addstr(&dest, "/objects");
 464                 copy_or_link_directory(&src, &dest, src_repo, src.len);
 465                 strbuf_release(&src);
 466                 strbuf_release(&dest);
 467         }
 468
 469         if (0 <= option_verbosity)
 470                 fprintf(stderr, _("done.\n"));
 471 }
 472
 473 static const char *junk_work_tree;
 474 static const char *junk_git_dir;
 475 static enum {
 476         JUNK_LEAVE_NONE,
 477         JUNK_LEAVE_REPO,
 478         JUNK_LEAVE_ALL
 479 } junk_mode = JUNK_LEAVE_NONE;
 480
 481 static const char junk_leave_repo_msg[] =
 482 N_("Clone succeeded, but checkout failed.\n"
 483    "You can inspect what was checked out with 'git status'\n"
 484    "and retry the checkout with 'git checkout -f HEAD'\n");
 485
 486 static void remove_junk(void)
 487 {
 488         struct strbuf sb = STRBUF_INIT;
 489
 490         switch (junk_mode) {
 491         case JUNK_LEAVE_REPO:
 492                 warning("%s", _(junk_leave_repo_msg));
 493                 /* fall-through */
 494         case JUNK_LEAVE_ALL:
 495                 return;
 496         default:
 497                 /* proceed to removal */
 498                 break;
 499         }
 500
 501         if (junk_git_dir) {
 502                 strbuf_addstr(&sb, junk_git_dir);
 503                 remove_dir_recursively(&sb, 0);
 504                 strbuf_reset(&sb);
 505         }
 506         if (junk_work_tree) {
 507                 strbuf_addstr(&sb, junk_work_tree);
 508                 remove_dir_recursively(&sb, 0);
 509                 strbuf_reset(&sb);
 510         }
 511 }
 512
 513 static void remove_junk_on_signal(int signo)
 514 {
 515         remove_junk();
 516         sigchain_pop(signo);
 517         raise(signo);
 518 }
 519
 520 static struct ref *find_remote_branch(const struct ref *refs, const char *branch)
 521 {
 522         struct ref *ref;
 523         struct strbuf head = STRBUF_INIT;
 524         strbuf_addstr(&head, "refs/heads/");
 525         strbuf_addstr(&head, branch);
 526         ref = find_ref_by_name(refs, head.buf);
 527         strbuf_release(&head);
 528
 529         if (ref)
 530                 return ref;
 531
 532         strbuf_addstr(&head, "refs/tags/");
 533         strbuf_addstr(&head, branch);
 534         ref = find_ref_by_name(refs, head.buf);
 535         strbuf_release(&head);
 536
 537         return ref;
 538 }
 539
 540 static struct ref *wanted_peer_refs(const struct ref *refs,
 541                 struct refspec *refspec)
 542 {
 543         struct ref *head = copy_ref(find_ref_by_name(refs, "HEAD"));
 544         struct ref *local_refs = head;
 545         struct ref **tail = head ? &head->next : &local_refs;
 546
 547         if (option_single_branch) {
 548                 struct ref *remote_head = NULL;
 549
 550                 if (!option_branch)
 551                         remote_head = guess_remote_head(head, refs, 0);
 552                 else {
 553                         local_refs = NULL;
 554                         tail = &local_refs;
 555                         remote_head = copy_ref(find_remote_branch(refs, option_branch));
 556                 }
 557
 558                 if (!remote_head && option_branch)
 559                         warning(_("Could not find remote branch %s to clone."),
 560                                 option_branch);
 561                 else {
 562                         get_fetch_map(remote_head, refspec, &tail, 0);
 563
 564                         /* if --branch=tag, pull the requested tag explicitly */
 565                         get_fetch_map(remote_head, tag_refspec, &tail, 0);
 566                 }
 567         } else
 568                 get_fetch_map(refs, refspec, &tail, 0);
 569
 570         if (!option_mirror && !option_single_branch && !option_no_tags)
 571                 get_fetch_map(refs, tag_refspec, &tail, 0);
 572
 573         return local_refs;
 574 }
 575
 576 static void write_remote_refs(const struct ref *local_refs)
 577 {
 578         const struct ref *r;
 579
 580         struct ref_transaction *t;
 581         struct strbuf err = STRBUF_INIT;
 582
 583         t = ref_transaction_begin(&err);
 584         if (!t)
 585                 die("%s", err.buf);
 586
 587         for (r = local_refs; r; r = r->next) {
 588                 if (!r->peer_ref)
 589                         continue;
 590                 if (ref_transaction_create(t, r->peer_ref->name, r->old_oid.hash,
 591                                            0, NULL, &err))
 592                         die("%s", err.buf);
 593         }
 594
 595         if (initial_ref_transaction_commit(t, &err))
 596                 die("%s", err.buf);
 597
 598         strbuf_release(&err);
 599         ref_transaction_free(t);
 600 }
 601
 602 static void write_followtags(const struct ref *refs, const char *msg)
 603 {
 604         const struct ref *ref;
 605         for (ref = refs; ref; ref = ref->next) {
 606                 if (!starts_with(ref->name, "refs/tags/"))
 607                         continue;
 608                 if (ends_with(ref->name, "^{}"))
 609                         continue;
 610                 if (!has_object_file(&ref->old_oid))
 611                         continue;
 612                 update_ref(msg, ref->name, ref->old_oid.hash,
 613                            NULL, 0, UPDATE_REFS_DIE_ON_ERR);
 614         }
 615 }
 616
 617 static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
 618 {
 619         struct ref **rm = cb_data;
 620         struct ref *ref = *rm;
 621
 622         /*
 623          * Skip anything missing a peer_ref, which we are not
 624          * actually going to write a ref for.
 625          */
 626         while (ref && !ref->peer_ref)
 627                 ref = ref->next;
 628         /* Returning -1 notes "end of list" to the caller. */
 629         if (!ref)
 630                 return -1;
 631
 632         hashcpy(sha1, ref->old_oid.hash);
 633         *rm = ref->next;
 634         return 0;
 635 }
 636
 637 static void update_remote_refs(const struct ref *refs,
 638                                const struct ref *mapped_refs,
 639                                const struct ref *remote_head_points_at,
 640                                const char *branch_top,
 641                                const char *msg,
 642                                struct transport *transport,
 643                                int check_connectivity)
 644 {
 645         const struct ref *rm = mapped_refs;
 646
 647         if (check_connectivity) {
 648                 struct check_connected_options opt = CHECK_CONNECTED_INIT;
 649
 650                 opt.transport = transport;
 651                 opt.progress = transport->progress;
 652
 653                 if (check_connected(iterate_ref_map, &rm, &opt))
 654                         die(_("remote did not send all necessary objects"));
 655         }
 656
 657         if (refs) {
 658                 write_remote_refs(mapped_refs);
 659                 if (option_single_branch && !option_no_tags)
 660                         write_followtags(refs, msg);
 661         }
 662
 663         if (remote_head_points_at && !option_bare) {
 664                 struct strbuf head_ref = STRBUF_INIT;
 665                 strbuf_addstr(&head_ref, branch_top);
 666                 strbuf_addstr(&head_ref, "HEAD");
 667                 if (create_symref(head_ref.buf,
 668                                   remote_head_points_at->peer_ref->name,
 669                                   msg) < 0)
 670                         die(_("unable to update %s"), head_ref.buf);
 671                 strbuf_release(&head_ref);
 672         }
 673 }
 674
 675 static void update_head(const struct ref *our, const struct ref *remote,
 676                         const char *msg)
 677 {
 678         const char *head;
 679         if (our && skip_prefix(our->name, "refs/heads/", &head)) {
 680                 /* Local default branch link */
 681                 if (create_symref("HEAD", our->name, NULL) < 0)
 682                         die(_("unable to update HEAD"));
 683                 if (!option_bare) {
 684                         update_ref(msg, "HEAD", our->old_oid.hash, NULL, 0,
 685                                    UPDATE_REFS_DIE_ON_ERR);
 686                         install_branch_config(0, head, option_origin, our->name);
 687                 }
 688         } else if (our) {
 689                 struct commit *c = lookup_commit_reference(&our->old_oid);
 690                 /* --branch specifies a non-branch (i.e. tags), detach HEAD */
 691                 update_ref(msg, "HEAD", c->object.oid.hash,
 692                            NULL, REF_NODEREF, UPDATE_REFS_DIE_ON_ERR);
 693         } else if (remote) {
 694                 /*
 695                  * We know remote HEAD points to a non-branch, or
 696                  * HEAD points to a branch but we don't know which one.
 697                  * Detach HEAD in all these cases.
 698                  */
 699                 update_ref(msg, "HEAD", remote->old_oid.hash,
 700                            NULL, REF_NODEREF, UPDATE_REFS_DIE_ON_ERR);
 701         }
 702 }
 703
 704 static int checkout(int submodule_progress)
 705 {
 706         struct object_id oid;
 707         char *head;
 708         struct lock_file *lock_file;
 709         struct unpack_trees_options opts;
 710         struct tree *tree;
 711         struct tree_desc t;
 712         int err = 0;
 713
 714         if (option_no_checkout)
 715                 return 0;
 716
 717         head = resolve_refdup("HEAD", RESOLVE_REF_READING, oid.hash, NULL);
 718         if (!head) {
 719                 warning(_("remote HEAD refers to nonexistent ref, "
 720                           "unable to checkout.\n"));
 721                 return 0;
 722         }
 723         if (!strcmp(head, "HEAD")) {
 724                 if (advice_detached_head)
 725                         detach_advice(oid_to_hex(&oid));
 726         } else {
 727                 if (!starts_with(head, "refs/heads/"))
 728                         die(_("HEAD not found below refs/heads!"));
 729         }
 730         free(head);
 731
 732         /* We need to be in the new work tree for the checkout */
 733         setup_work_tree();
 734
 735         lock_file = xcalloc(1, sizeof(struct lock_file));
 736         hold_locked_index(lock_file, LOCK_DIE_ON_ERROR);
 737
 738         memset(&opts, 0, sizeof opts);
 739         opts.update = 1;
 740         opts.merge = 1;
 741         opts.fn = oneway_merge;
 742         opts.verbose_update = (option_verbosity >= 0);
 743         opts.src_index = &the_index;
 744         opts.dst_index = &the_index;
 745
 746         tree = parse_tree_indirect(&oid);
 747         parse_tree(tree);
 748         init_tree_desc(&t, tree->buffer, tree->size);
 749         if (unpack_trees(1, &t, &opts) < 0)
 750                 die(_("unable to checkout working tree"));
 751
 752         if (write_locked_index(&the_index, lock_file, COMMIT_LOCK))
 753                 die(_("unable to write new index file"));
 754
 755         err |= run_hook_le(NULL, "post-checkout", sha1_to_hex(null_sha1),
 756                            oid_to_hex(&oid), "1", NULL);
 757
 758         if (!err && (option_recurse_submodules.nr > 0)) {
 759                 struct argv_array args = ARGV_ARRAY_INIT;
 760                 argv_array_pushl(&args, "submodule", "update", "--init", "--recursive", NULL);
 761
 762                 if (option_shallow_submodules == 1)
 763                         argv_array_push(&args, "--depth=1");
 764
 765                 if (max_jobs != -1)
 766                         argv_array_pushf(&args, "--jobs=%d", max_jobs);
 767
 768                 if (submodule_progress)
 769                         argv_array_push(&args, "--progress");
 770
 771                 err = run_command_v_opt(args.argv, RUN_GIT_CMD);
 772                 argv_array_clear(&args);
 773         }
 774
 775         return err;
 776 }
 777
 778 static int write_one_config(const char *key, const char *value, void *data)
 779 {
 780         return git_config_set_multivar_gently(key,
 781                                               value ? value : "true",
 782                                               CONFIG_REGEX_NONE, 0);
 783 }
 784
 785 static void write_config(struct string_list *config)
 786 {
 787         int i;
 788
 789         for (i = 0; i < config->nr; i++) {
 790                 if (git_config_parse_parameter(config->items[i].string,
 791                                                write_one_config, NULL) < 0)
 792                         die(_("unable to write parameters to config file"));
 793         }
 794 }
 795
 796 static void write_refspec_config(const char *src_ref_prefix,
 797                 const struct ref *our_head_points_at,
 798                 const struct ref *remote_head_points_at,
 799                 struct strbuf *branch_top)
 800 {
 801         struct strbuf key = STRBUF_INIT;
 802         struct strbuf value = STRBUF_INIT;
 803
 804         if (option_mirror || !option_bare) {
 805                 if (option_single_branch && !option_mirror) {
 806                         if (option_branch) {
 807                                 if (starts_with(our_head_points_at->name, "refs/tags/"))
 808                                         strbuf_addf(&value, "+%s:%s", our_head_points_at->name,
 809                                                 our_head_points_at->name);
 810                                 else
 811                                         strbuf_addf(&value, "+%s:%s%s", our_head_points_at->name,
 812                                                 branch_top->buf, option_branch);
 813                         } else if (remote_head_points_at) {
 814                                 const char *head = remote_head_points_at->name;
 815                                 if (!skip_prefix(head, "refs/heads/", &head))
 816                                         die("BUG: remote HEAD points at non-head?");
 817
 818                                 strbuf_addf(&value, "+%s:%s%s", remote_head_points_at->name,
 819                                                 branch_top->buf, head);
 820                         }
 821                         /*
 822                          * otherwise, the next "git fetch" will
 823                          * simply fetch from HEAD without updating
 824                          * any remote-tracking branch, which is what
 825                          * we want.
 826                          */
 827                 } else {
 828                         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top->buf);
 829                 }
 830                 /* Configure the remote */
 831                 if (value.len) {
 832                         strbuf_addf(&key, "remote.%s.fetch", option_origin);
 833                         git_config_set_multivar(key.buf, value.buf, "^$", 0);
 834                         strbuf_reset(&key);
 835
 836                         if (option_mirror) {
 837                                 strbuf_addf(&key, "remote.%s.mirror", option_origin);
 838                                 git_config_set(key.buf, "true");
 839                                 strbuf_reset(&key);
 840                         }
 841                 }
 842         }
 843
 844         strbuf_release(&key);
 845         strbuf_release(&value);
 846 }
 847
 848 static void dissociate_from_references(void)
 849 {
 850         static const char* argv[] = { "repack", "-a", "-d", NULL };
 851         char *alternates = git_pathdup("objects/info/alternates");
 852
 853         if (!access(alternates, F_OK)) {
 854                 if (run_command_v_opt(argv, RUN_GIT_CMD|RUN_COMMAND_NO_STDIN))
 855                         die(_("cannot repack to clean up"));
 856                 if (unlink(alternates) && errno != ENOENT)
 857                         die_errno(_("cannot unlink temporary alternates file"));
 858         }
 859         free(alternates);
 860 }
 861
 862 int cmd_clone(int argc, const char **argv, const char *prefix)
 863 {
 864         int is_bundle = 0, is_local;
 865         struct stat buf;
 866         const char *repo_name, *repo, *work_tree, *git_dir;
 867         char *path, *dir;
 868         int dest_exists;
 869         const struct ref *refs, *remote_head;
 870         const struct ref *remote_head_points_at;
 871         const struct ref *our_head_points_at;
 872         struct ref *mapped_refs;
 873         const struct ref *ref;
 874         struct strbuf key = STRBUF_INIT, value = STRBUF_INIT;
 875         struct strbuf branch_top = STRBUF_INIT, reflog_msg = STRBUF_INIT;
 876         struct transport *transport = NULL;
 877         const char *src_ref_prefix = "refs/heads/";
 878         struct remote *remote;
 879         int err = 0, complete_refs_before_fetch = 1;
 880         int submodule_progress;
 881
 882         struct refspec *refspec;
 883         const char *fetch_pattern;
 884
 885         packet_trace_identity("clone");
 886         argc = parse_options(argc, argv, prefix, builtin_clone_options,
 887                              builtin_clone_usage, 0);
 888
 889         if (argc > 2)
 890                 usage_msg_opt(_("Too many arguments."),
 891                         builtin_clone_usage, builtin_clone_options);
 892
 893         if (argc == 0)
 894                 usage_msg_opt(_("You must specify a repository to clone."),
 895                         builtin_clone_usage, builtin_clone_options);
 896
 897         if (option_depth || option_since || option_not.nr)
 898                 deepen = 1;
 899         if (option_single_branch == -1)
 900                 option_single_branch = deepen ? 1 : 0;
 901
 902         if (option_mirror)
 903                 option_bare = 1;
 904
 905         if (option_bare) {
 906                 if (option_origin)
 907                         die(_("--bare and --origin %s options are incompatible."),
 908                             option_origin);
 909                 if (real_git_dir)
 910                         die(_("--bare and --separate-git-dir are incompatible."));
 911                 option_no_checkout = 1;
 912         }
 913
 914         if (!option_origin)
 915                 option_origin = "origin";
 916
 917         repo_name = argv[0];
 918
 919         path = get_repo_path(repo_name, &is_bundle);
 920         if (path)
 921                 repo = absolute_pathdup(repo_name);
 922         else if (!strchr(repo_name, ':'))
 923                 die(_("repository '%s' does not exist"), repo_name);
 924         else
 925                 repo = repo_name;
 926
 927         /* no need to be strict, transport_set_option() will validate it again */
 928         if (option_depth && atoi(option_depth) < 1)
 929                 die(_("depth %s is not a positive number"), option_depth);
 930
 931         if (argc == 2)
 932                 dir = xstrdup(argv[1]);
 933         else
 934                 dir = guess_dir_name(repo_name, is_bundle, option_bare);
 935         strip_trailing_slashes(dir);
 936
 937         dest_exists = !stat(dir, &buf);
 938         if (dest_exists && !is_empty_dir(dir))
 939                 die(_("destination path '%s' already exists and is not "
 940                         "an empty directory."), dir);
 941
 942         strbuf_addf(&reflog_msg, "clone: from %s", repo);
 943
 944         if (option_bare)
 945                 work_tree = NULL;
 946         else {
 947                 work_tree = getenv("GIT_WORK_TREE");
 948                 if (work_tree && !stat(work_tree, &buf))
 949                         die(_("working tree '%s' already exists."), work_tree);
 950         }
 951
 952         if (option_bare || work_tree)
 953                 git_dir = xstrdup(dir);
 954         else {
 955                 work_tree = dir;
 956                 git_dir = mkpathdup("%s/.git", dir);
 957         }
 958
 959         atexit(remove_junk);
 960         sigchain_push_common(remove_junk_on_signal);
 961
 962         if (!option_bare) {
 963                 if (safe_create_leading_directories_const(work_tree) < 0)
 964                         die_errno(_("could not create leading directories of '%s'"),
 965                                   work_tree);
 966                 if (!dest_exists && mkdir(work_tree, 0777))
 967                         die_errno(_("could not create work tree dir '%s'"),
 968                                   work_tree);
 969                 junk_work_tree = work_tree;
 970                 set_git_work_tree(work_tree);
 971         }
 972
 973         junk_git_dir = real_git_dir ? real_git_dir : git_dir;
 974         if (safe_create_leading_directories_const(git_dir) < 0)
 975                 die(_("could not create leading directories of '%s'"), git_dir);
 976
 977         if (0 <= option_verbosity) {
 978                 if (option_bare)
 979                         fprintf(stderr, _("Cloning into bare repository '%s'...\n"), dir);
 980                 else
 981                         fprintf(stderr, _("Cloning into '%s'...\n"), dir);
 982         }
 983
 984         if (option_recurse_submodules.nr > 0) {
 985                 struct string_list_item *item;
 986                 struct strbuf sb = STRBUF_INIT;
 987
 988                 /* remove duplicates */
 989                 string_list_sort(&option_recurse_submodules);
 990                 string_list_remove_duplicates(&option_recurse_submodules, 0);
 991
 992                 /*
 993                  * NEEDSWORK: In a multi-working-tree world, this needs to be
 994                  * set in the per-worktree config.
 995                  */
 996                 for_each_string_list_item(item, &option_recurse_submodules) {
 997                         strbuf_addf(&sb, "submodule.active=%s",
 998                                     item->string);
 999                         string_list_append(&option_config,
1000                                            strbuf_detach(&sb, NULL));
1001                 }
1002
1003                 if (option_required_reference.nr &&
1004                     option_optional_reference.nr)
1005                         die(_("clone --recursive is not compatible with "
1006                               "both --reference and --reference-if-able"));
1007                 else if (option_required_reference.nr) {
1008                         string_list_append(&option_config,
1009                                 "submodule.alternateLocation=superproject");
1010                         string_list_append(&option_config,
1011                                 "submodule.alternateErrorStrategy=die");
1012                 } else if (option_optional_reference.nr) {
1013                         string_list_append(&option_config,
1014                                 "submodule.alternateLocation=superproject");
1015                         string_list_append(&option_config,
1016                                 "submodule.alternateErrorStrategy=info");
1017                 }
1018         }
1019
1020         init_db(git_dir, real_git_dir, option_template, INIT_DB_QUIET);
1021
1022         if (real_git_dir)
1023                 git_dir = real_git_dir;
1024
1025         write_config(&option_config);
1026
1027         git_config(git_default_config, NULL);
1028
1029         if (option_bare) {
1030                 if (option_mirror)
1031                         src_ref_prefix = "refs/";
1032                 strbuf_addstr(&branch_top, src_ref_prefix);
1033
1034                 git_config_set("core.bare", "true");
1035         } else {
1036                 strbuf_addf(&branch_top, "refs/remotes/%s/", option_origin);
1037         }
1038
1039         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top.buf);
1040         strbuf_addf(&key, "remote.%s.url", option_origin);
1041         git_config_set(key.buf, repo);
1042         strbuf_reset(&key);
1043
1044         if (option_no_tags) {
1045                 strbuf_addf(&key, "remote.%s.tagOpt", option_origin);
1046                 git_config_set(key.buf, "--no-tags");
1047                 strbuf_reset(&key);
1048         }
1049
1050         if (option_required_reference.nr || option_optional_reference.nr)
1051                 setup_reference();
1052
1053         fetch_pattern = value.buf;
1054         refspec = parse_fetch_refspec(1, &fetch_pattern);
1055
1056         strbuf_reset(&value);
1057
1058         remote = remote_get(option_origin);
1059         transport = transport_get(remote, remote->url[0]);
1060         transport_set_verbosity(transport, option_verbosity, option_progress);
1061         transport->family = family;
1062
1063         path = get_repo_path(remote->url[0], &is_bundle);
1064         is_local = option_local != 0 && path && !is_bundle;
1065         if (is_local) {
1066                 if (option_depth)
1067                         warning(_("--depth is ignored in local clones; use file:// instead."));
1068                 if (option_since)
1069                         warning(_("--shallow-since is ignored in local clones; use file:// instead."));
1070                 if (option_not.nr)
1071                         warning(_("--shallow-exclude is ignored in local clones; use file:// instead."));
1072                 if (!access(mkpath("%s/shallow", path), F_OK)) {
1073                         if (option_local > 0)
1074                                 warning(_("source repository is shallow, ignoring --local"));
1075                         is_local = 0;
1076                 }
1077         }
1078         if (option_local > 0 && !is_local)
1079                 warning(_("--local is ignored"));
1080         transport->cloning = 1;
1081
1082         if (!transport->get_refs_list || (!is_local && !transport->fetch))
1083                 die(_("Don't know how to clone %s"), transport->url);
1084
1085         transport_set_option(transport, TRANS_OPT_KEEP, "yes");
1086
1087         if (option_depth)
1088                 transport_set_option(transport, TRANS_OPT_DEPTH,
1089                                      option_depth);
1090         if (option_since)
1091                 transport_set_option(transport, TRANS_OPT_DEEPEN_SINCE,
1092                                      option_since);
1093         if (option_not.nr)
1094                 transport_set_option(transport, TRANS_OPT_DEEPEN_NOT,
1095                                      (const char *)&option_not);
1096         if (option_single_branch)
1097                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
1098
1099         if (option_upload_pack)
1100                 transport_set_option(transport, TRANS_OPT_UPLOADPACK,
1101                                      option_upload_pack);
1102
1103         if (transport->smart_options && !deepen)
1104                 transport->smart_options->check_self_contained_and_connected = 1;
1105
1106         refs = transport_get_remote_refs(transport);
1107
1108         if (refs) {
1109                 mapped_refs = wanted_peer_refs(refs, refspec);
1110                 /*
1111                  * transport_get_remote_refs() may return refs with null sha-1
1112                  * in mapped_refs (see struct transport->get_refs_list
1113                  * comment). In that case we need fetch it early because
1114                  * remote_head code below relies on it.
1115                  *
1116                  * for normal clones, transport_get_remote_refs() should
1117                  * return reliable ref set, we can delay cloning until after
1118                  * remote HEAD check.
1119                  */
1120                 for (ref = refs; ref; ref = ref->next)
1121                         if (is_null_oid(&ref->old_oid)) {
1122                                 complete_refs_before_fetch = 0;
1123                                 break;
1124                         }
1125
1126                 if (!is_local && !complete_refs_before_fetch)
1127                         transport_fetch_refs(transport, mapped_refs);
1128
1129                 remote_head = find_ref_by_name(refs, "HEAD");
1130                 remote_head_points_at =
1131                         guess_remote_head(remote_head, mapped_refs, 0);
1132
1133                 if (option_branch) {
1134                         our_head_points_at =
1135                                 find_remote_branch(mapped_refs, option_branch);
1136
1137                         if (!our_head_points_at)
1138                                 die(_("Remote branch %s not found in upstream %s"),
1139                                     option_branch, option_origin);
1140                 }
1141                 else
1142                         our_head_points_at = remote_head_points_at;
1143         }
1144         else {
1145                 if (option_branch)
1146                         die(_("Remote branch %s not found in upstream %s"),
1147                                         option_branch, option_origin);
1148
1149                 warning(_("You appear to have cloned an empty repository."));
1150                 mapped_refs = NULL;
1151                 our_head_points_at = NULL;
1152                 remote_head_points_at = NULL;
1153                 remote_head = NULL;
1154                 option_no_checkout = 1;
1155                 if (!option_bare)
1156                         install_branch_config(0, "master", option_origin,
1157                                               "refs/heads/master");
1158         }
1159
1160         write_refspec_config(src_ref_prefix, our_head_points_at,
1161                         remote_head_points_at, &branch_top);
1162
1163         if (is_local)
1164                 clone_local(path, git_dir);
1165         else if (refs && complete_refs_before_fetch)
1166                 transport_fetch_refs(transport, mapped_refs);
1167
1168         update_remote_refs(refs, mapped_refs, remote_head_points_at,
1169                            branch_top.buf, reflog_msg.buf, transport, !is_local);
1170
1171         update_head(our_head_points_at, remote_head, reflog_msg.buf);
1172
1173         /*
1174          * We want to show progress for recursive submodule clones iff
1175          * we did so for the main clone. But only the transport knows
1176          * the final decision for this flag, so we need to rescue the value
1177          * before we free the transport.
1178          */
1179         submodule_progress = transport->progress;
1180
1181         transport_unlock_pack(transport);
1182         transport_disconnect(transport);
1183
1184         if (option_dissociate) {
1185                 close_all_packs();
1186                 dissociate_from_references();
1187         }
1188
1189         junk_mode = JUNK_LEAVE_REPO;
1190         err = checkout(submodule_progress);
1191
1192         strbuf_release(&reflog_msg);
1193         strbuf_release(&branch_top);
1194         strbuf_release(&key);
1195         strbuf_release(&value);
1196         junk_mode = JUNK_LEAVE_ALL;
1197
1198         free(refspec);
1199         return err;
1200 }