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                 if (option_verbosity < 0)
 772                         argv_array_push(&args, "--quiet");
 773
 774                 err = run_command_v_opt(args.argv, RUN_GIT_CMD);
 775                 argv_array_clear(&args);
 776         }
 777
 778         return err;
 779 }
 780
 781 static int write_one_config(const char *key, const char *value, void *data)
 782 {
 783         return git_config_set_multivar_gently(key,
 784                                               value ? value : "true",
 785                                               CONFIG_REGEX_NONE, 0);
 786 }
 787
 788 static void write_config(struct string_list *config)
 789 {
 790         int i;
 791
 792         for (i = 0; i < config->nr; i++) {
 793                 if (git_config_parse_parameter(config->items[i].string,
 794                                                write_one_config, NULL) < 0)
 795                         die(_("unable to write parameters to config file"));
 796         }
 797 }
 798
 799 static void write_refspec_config(const char *src_ref_prefix,
 800                 const struct ref *our_head_points_at,
 801                 const struct ref *remote_head_points_at,
 802                 struct strbuf *branch_top)
 803 {
 804         struct strbuf key = STRBUF_INIT;
 805         struct strbuf value = STRBUF_INIT;
 806
 807         if (option_mirror || !option_bare) {
 808                 if (option_single_branch && !option_mirror) {
 809                         if (option_branch) {
 810                                 if (starts_with(our_head_points_at->name, "refs/tags/"))
 811                                         strbuf_addf(&value, "+%s:%s", our_head_points_at->name,
 812                                                 our_head_points_at->name);
 813                                 else
 814                                         strbuf_addf(&value, "+%s:%s%s", our_head_points_at->name,
 815                                                 branch_top->buf, option_branch);
 816                         } else if (remote_head_points_at) {
 817                                 const char *head = remote_head_points_at->name;
 818                                 if (!skip_prefix(head, "refs/heads/", &head))
 819                                         die("BUG: remote HEAD points at non-head?");
 820
 821                                 strbuf_addf(&value, "+%s:%s%s", remote_head_points_at->name,
 822                                                 branch_top->buf, head);
 823                         }
 824                         /*
 825                          * otherwise, the next "git fetch" will
 826                          * simply fetch from HEAD without updating
 827                          * any remote-tracking branch, which is what
 828                          * we want.
 829                          */
 830                 } else {
 831                         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top->buf);
 832                 }
 833                 /* Configure the remote */
 834                 if (value.len) {
 835                         strbuf_addf(&key, "remote.%s.fetch", option_origin);
 836                         git_config_set_multivar(key.buf, value.buf, "^$", 0);
 837                         strbuf_reset(&key);
 838
 839                         if (option_mirror) {
 840                                 strbuf_addf(&key, "remote.%s.mirror", option_origin);
 841                                 git_config_set(key.buf, "true");
 842                                 strbuf_reset(&key);
 843                         }
 844                 }
 845         }
 846
 847         strbuf_release(&key);
 848         strbuf_release(&value);
 849 }
 850
 851 static void dissociate_from_references(void)
 852 {
 853         static const char* argv[] = { "repack", "-a", "-d", NULL };
 854         char *alternates = git_pathdup("objects/info/alternates");
 855
 856         if (!access(alternates, F_OK)) {
 857                 if (run_command_v_opt(argv, RUN_GIT_CMD|RUN_COMMAND_NO_STDIN))
 858                         die(_("cannot repack to clean up"));
 859                 if (unlink(alternates) && errno != ENOENT)
 860                         die_errno(_("cannot unlink temporary alternates file"));
 861         }
 862         free(alternates);
 863 }
 864
 865 int cmd_clone(int argc, const char **argv, const char *prefix)
 866 {
 867         int is_bundle = 0, is_local;
 868         struct stat buf;
 869         const char *repo_name, *repo, *work_tree, *git_dir;
 870         char *path, *dir;
 871         int dest_exists;
 872         const struct ref *refs, *remote_head;
 873         const struct ref *remote_head_points_at;
 874         const struct ref *our_head_points_at;
 875         struct ref *mapped_refs;
 876         const struct ref *ref;
 877         struct strbuf key = STRBUF_INIT, value = STRBUF_INIT;
 878         struct strbuf branch_top = STRBUF_INIT, reflog_msg = STRBUF_INIT;
 879         struct transport *transport = NULL;
 880         const char *src_ref_prefix = "refs/heads/";
 881         struct remote *remote;
 882         int err = 0, complete_refs_before_fetch = 1;
 883         int submodule_progress;
 884
 885         struct refspec *refspec;
 886         const char *fetch_pattern;
 887
 888         packet_trace_identity("clone");
 889         argc = parse_options(argc, argv, prefix, builtin_clone_options,
 890                              builtin_clone_usage, 0);
 891
 892         if (argc > 2)
 893                 usage_msg_opt(_("Too many arguments."),
 894                         builtin_clone_usage, builtin_clone_options);
 895
 896         if (argc == 0)
 897                 usage_msg_opt(_("You must specify a repository to clone."),
 898                         builtin_clone_usage, builtin_clone_options);
 899
 900         if (option_depth || option_since || option_not.nr)
 901                 deepen = 1;
 902         if (option_single_branch == -1)
 903                 option_single_branch = deepen ? 1 : 0;
 904
 905         if (option_mirror)
 906                 option_bare = 1;
 907
 908         if (option_bare) {
 909                 if (option_origin)
 910                         die(_("--bare and --origin %s options are incompatible."),
 911                             option_origin);
 912                 if (real_git_dir)
 913                         die(_("--bare and --separate-git-dir are incompatible."));
 914                 option_no_checkout = 1;
 915         }
 916
 917         if (!option_origin)
 918                 option_origin = "origin";
 919
 920         repo_name = argv[0];
 921
 922         path = get_repo_path(repo_name, &is_bundle);
 923         if (path)
 924                 repo = absolute_pathdup(repo_name);
 925         else if (!strchr(repo_name, ':'))
 926                 die(_("repository '%s' does not exist"), repo_name);
 927         else
 928                 repo = repo_name;
 929
 930         /* no need to be strict, transport_set_option() will validate it again */
 931         if (option_depth && atoi(option_depth) < 1)
 932                 die(_("depth %s is not a positive number"), option_depth);
 933
 934         if (argc == 2)
 935                 dir = xstrdup(argv[1]);
 936         else
 937                 dir = guess_dir_name(repo_name, is_bundle, option_bare);
 938         strip_trailing_slashes(dir);
 939
 940         dest_exists = !stat(dir, &buf);
 941         if (dest_exists && !is_empty_dir(dir))
 942                 die(_("destination path '%s' already exists and is not "
 943                         "an empty directory."), dir);
 944
 945         strbuf_addf(&reflog_msg, "clone: from %s", repo);
 946
 947         if (option_bare)
 948                 work_tree = NULL;
 949         else {
 950                 work_tree = getenv("GIT_WORK_TREE");
 951                 if (work_tree && !stat(work_tree, &buf))
 952                         die(_("working tree '%s' already exists."), work_tree);
 953         }
 954
 955         if (option_bare || work_tree)
 956                 git_dir = xstrdup(dir);
 957         else {
 958                 work_tree = dir;
 959                 git_dir = mkpathdup("%s/.git", dir);
 960         }
 961
 962         atexit(remove_junk);
 963         sigchain_push_common(remove_junk_on_signal);
 964
 965         if (!option_bare) {
 966                 if (safe_create_leading_directories_const(work_tree) < 0)
 967                         die_errno(_("could not create leading directories of '%s'"),
 968                                   work_tree);
 969                 if (!dest_exists && mkdir(work_tree, 0777))
 970                         die_errno(_("could not create work tree dir '%s'"),
 971                                   work_tree);
 972                 junk_work_tree = work_tree;
 973                 set_git_work_tree(work_tree);
 974         }
 975
 976         junk_git_dir = real_git_dir ? real_git_dir : git_dir;
 977         if (safe_create_leading_directories_const(git_dir) < 0)
 978                 die(_("could not create leading directories of '%s'"), git_dir);
 979
 980         if (0 <= option_verbosity) {
 981                 if (option_bare)
 982                         fprintf(stderr, _("Cloning into bare repository '%s'...\n"), dir);
 983                 else
 984                         fprintf(stderr, _("Cloning into '%s'...\n"), dir);
 985         }
 986
 987         if (option_recurse_submodules.nr > 0) {
 988                 struct string_list_item *item;
 989                 struct strbuf sb = STRBUF_INIT;
 990
 991                 /* remove duplicates */
 992                 string_list_sort(&option_recurse_submodules);
 993                 string_list_remove_duplicates(&option_recurse_submodules, 0);
 994
 995                 /*
 996                  * NEEDSWORK: In a multi-working-tree world, this needs to be
 997                  * set in the per-worktree config.
 998                  */
 999                 for_each_string_list_item(item, &option_recurse_submodules) {
1000                         strbuf_addf(&sb, "submodule.active=%s",
1001                                     item->string);
1002                         string_list_append(&option_config,
1003                                            strbuf_detach(&sb, NULL));
1004                 }
1005
1006                 if (option_required_reference.nr &&
1007                     option_optional_reference.nr)
1008                         die(_("clone --recursive is not compatible with "
1009                               "both --reference and --reference-if-able"));
1010                 else if (option_required_reference.nr) {
1011                         string_list_append(&option_config,
1012                                 "submodule.alternateLocation=superproject");
1013                         string_list_append(&option_config,
1014                                 "submodule.alternateErrorStrategy=die");
1015                 } else if (option_optional_reference.nr) {
1016                         string_list_append(&option_config,
1017                                 "submodule.alternateLocation=superproject");
1018                         string_list_append(&option_config,
1019                                 "submodule.alternateErrorStrategy=info");
1020                 }
1021         }
1022
1023         init_db(git_dir, real_git_dir, option_template, INIT_DB_QUIET);
1024
1025         if (real_git_dir)
1026                 git_dir = real_git_dir;
1027
1028         write_config(&option_config);
1029
1030         git_config(git_default_config, NULL);
1031
1032         if (option_bare) {
1033                 if (option_mirror)
1034                         src_ref_prefix = "refs/";
1035                 strbuf_addstr(&branch_top, src_ref_prefix);
1036
1037                 git_config_set("core.bare", "true");
1038         } else {
1039                 strbuf_addf(&branch_top, "refs/remotes/%s/", option_origin);
1040         }
1041
1042         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top.buf);
1043         strbuf_addf(&key, "remote.%s.url", option_origin);
1044         git_config_set(key.buf, repo);
1045         strbuf_reset(&key);
1046
1047         if (option_no_tags) {
1048                 strbuf_addf(&key, "remote.%s.tagOpt", option_origin);
1049                 git_config_set(key.buf, "--no-tags");
1050                 strbuf_reset(&key);
1051         }
1052
1053         if (option_required_reference.nr || option_optional_reference.nr)
1054                 setup_reference();
1055
1056         fetch_pattern = value.buf;
1057         refspec = parse_fetch_refspec(1, &fetch_pattern);
1058
1059         strbuf_reset(&value);
1060
1061         remote = remote_get(option_origin);
1062         transport = transport_get(remote, remote->url[0]);
1063         transport_set_verbosity(transport, option_verbosity, option_progress);
1064         transport->family = family;
1065
1066         path = get_repo_path(remote->url[0], &is_bundle);
1067         is_local = option_local != 0 && path && !is_bundle;
1068         if (is_local) {
1069                 if (option_depth)
1070                         warning(_("--depth is ignored in local clones; use file:// instead."));
1071                 if (option_since)
1072                         warning(_("--shallow-since is ignored in local clones; use file:// instead."));
1073                 if (option_not.nr)
1074                         warning(_("--shallow-exclude is ignored in local clones; use file:// instead."));
1075                 if (!access(mkpath("%s/shallow", path), F_OK)) {
1076                         if (option_local > 0)
1077                                 warning(_("source repository is shallow, ignoring --local"));
1078                         is_local = 0;
1079                 }
1080         }
1081         if (option_local > 0 && !is_local)
1082                 warning(_("--local is ignored"));
1083         transport->cloning = 1;
1084
1085         if (!transport->get_refs_list || (!is_local && !transport->fetch))
1086                 die(_("Don't know how to clone %s"), transport->url);
1087
1088         transport_set_option(transport, TRANS_OPT_KEEP, "yes");
1089
1090         if (option_depth)
1091                 transport_set_option(transport, TRANS_OPT_DEPTH,
1092                                      option_depth);
1093         if (option_since)
1094                 transport_set_option(transport, TRANS_OPT_DEEPEN_SINCE,
1095                                      option_since);
1096         if (option_not.nr)
1097                 transport_set_option(transport, TRANS_OPT_DEEPEN_NOT,
1098                                      (const char *)&option_not);
1099         if (option_single_branch)
1100                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
1101
1102         if (option_upload_pack)
1103                 transport_set_option(transport, TRANS_OPT_UPLOADPACK,
1104                                      option_upload_pack);
1105
1106         if (transport->smart_options && !deepen)
1107                 transport->smart_options->check_self_contained_and_connected = 1;
1108
1109         refs = transport_get_remote_refs(transport);
1110
1111         if (refs) {
1112                 mapped_refs = wanted_peer_refs(refs, refspec);
1113                 /*
1114                  * transport_get_remote_refs() may return refs with null sha-1
1115                  * in mapped_refs (see struct transport->get_refs_list
1116                  * comment). In that case we need fetch it early because
1117                  * remote_head code below relies on it.
1118                  *
1119                  * for normal clones, transport_get_remote_refs() should
1120                  * return reliable ref set, we can delay cloning until after
1121                  * remote HEAD check.
1122                  */
1123                 for (ref = refs; ref; ref = ref->next)
1124                         if (is_null_oid(&ref->old_oid)) {
1125                                 complete_refs_before_fetch = 0;
1126                                 break;
1127                         }
1128
1129                 if (!is_local && !complete_refs_before_fetch)
1130                         transport_fetch_refs(transport, mapped_refs);
1131
1132                 remote_head = find_ref_by_name(refs, "HEAD");
1133                 remote_head_points_at =
1134                         guess_remote_head(remote_head, mapped_refs, 0);
1135
1136                 if (option_branch) {
1137                         our_head_points_at =
1138                                 find_remote_branch(mapped_refs, option_branch);
1139
1140                         if (!our_head_points_at)
1141                                 die(_("Remote branch %s not found in upstream %s"),
1142                                     option_branch, option_origin);
1143                 }
1144                 else
1145                         our_head_points_at = remote_head_points_at;
1146         }
1147         else {
1148                 if (option_branch)
1149                         die(_("Remote branch %s not found in upstream %s"),
1150                                         option_branch, option_origin);
1151
1152                 warning(_("You appear to have cloned an empty repository."));
1153                 mapped_refs = NULL;
1154                 our_head_points_at = NULL;
1155                 remote_head_points_at = NULL;
1156                 remote_head = NULL;
1157                 option_no_checkout = 1;
1158                 if (!option_bare)
1159                         install_branch_config(0, "master", option_origin,
1160                                               "refs/heads/master");
1161         }
1162
1163         write_refspec_config(src_ref_prefix, our_head_points_at,
1164                         remote_head_points_at, &branch_top);
1165
1166         if (is_local)
1167                 clone_local(path, git_dir);
1168         else if (refs && complete_refs_before_fetch)
1169                 transport_fetch_refs(transport, mapped_refs);
1170
1171         update_remote_refs(refs, mapped_refs, remote_head_points_at,
1172                            branch_top.buf, reflog_msg.buf, transport, !is_local);
1173
1174         update_head(our_head_points_at, remote_head, reflog_msg.buf);
1175
1176         /*
1177          * We want to show progress for recursive submodule clones iff
1178          * we did so for the main clone. But only the transport knows
1179          * the final decision for this flag, so we need to rescue the value
1180          * before we free the transport.
1181          */
1182         submodule_progress = transport->progress;
1183
1184         transport_unlock_pack(transport);
1185         transport_disconnect(transport);
1186
1187         if (option_dissociate) {
1188                 close_all_packs();
1189                 dissociate_from_references();
1190         }
1191
1192         junk_mode = JUNK_LEAVE_REPO;
1193         err = checkout(submodule_progress);
1194
1195         strbuf_release(&reflog_msg);
1196         strbuf_release(&branch_top);
1197         strbuf_release(&key);
1198         strbuf_release(&value);
1199         junk_mode = JUNK_LEAVE_ALL;
1200
1201         free(refspec);
1202         return err;
1203 }