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 #define USE_THE_INDEX_COMPATIBILITY_MACROS
  12 #include "builtin.h"
  13 #include "config.h"
  14 #include "lockfile.h"
  15 #include "parse-options.h"
  16 #include "fetch-pack.h"
  17 #include "refs.h"
  18 #include "refspec.h"
  19 #include "object-store.h"
  20 #include "tree.h"
  21 #include "tree-walk.h"
  22 #include "unpack-trees.h"
  23 #include "transport.h"
  24 #include "strbuf.h"
  25 #include "dir.h"
  26 #include "sigchain.h"
  27 #include "branch.h"
  28 #include "remote.h"
  29 #include "run-command.h"
  30 #include "connected.h"
  31 #include "packfile.h"
  32 #include "list-objects-filter-options.h"
  33 #include "object-store.h"
  34
  35 /*
  36  * Overall FIXMEs:
  37  *  - respect DB_ENVIRONMENT for .git/objects.
  38  *
  39  * Implementation notes:
  40  *  - dropping use-separate-remote and no-separate-remote compatibility
  41  *
  42  */
  43 static const char * const builtin_clone_usage[] = {
  44         N_("git clone [<options>] [--] <repo> [<dir>]"),
  45         NULL
  46 };
  47
  48 static int option_no_checkout, option_bare, option_mirror, option_single_branch = -1;
  49 static int option_local = -1, option_no_hardlinks, option_shared;
  50 static int option_no_tags;
  51 static int option_shallow_submodules;
  52 static int deepen;
  53 static char *option_template, *option_depth, *option_since;
  54 static char *option_origin = NULL;
  55 static char *option_branch = NULL;
  56 static struct string_list option_not = STRING_LIST_INIT_NODUP;
  57 static const char *real_git_dir;
  58 static char *option_upload_pack = "git-upload-pack";
  59 static int option_verbosity;
  60 static int option_progress = -1;
  61 static enum transport_family family;
  62 static struct string_list option_config = STRING_LIST_INIT_NODUP;
  63 static struct string_list option_required_reference = STRING_LIST_INIT_NODUP;
  64 static struct string_list option_optional_reference = STRING_LIST_INIT_NODUP;
  65 static int option_dissociate;
  66 static int max_jobs = -1;
  67 static struct string_list option_recurse_submodules = STRING_LIST_INIT_NODUP;
  68 static struct list_objects_filter_options filter_options;
  69 static struct string_list server_options = STRING_LIST_INIT_NODUP;
  70
  71 static int recurse_submodules_cb(const struct option *opt,
  72                                  const char *arg, int unset)
  73 {
  74         if (unset)
  75                 string_list_clear((struct string_list *)opt->value, 0);
  76         else if (arg)
  77                 string_list_append((struct string_list *)opt->value, arg);
  78         else
  79                 string_list_append((struct string_list *)opt->value,
  80                                    (const char *)opt->defval);
  81
  82         return 0;
  83 }
  84
  85 static struct option builtin_clone_options[] = {
  86         OPT__VERBOSITY(&option_verbosity),
  87         OPT_BOOL(0, "progress", &option_progress,
  88                  N_("force progress reporting")),
  89         OPT_BOOL('n', "no-checkout", &option_no_checkout,
  90                  N_("don't create a checkout")),
  91         OPT_BOOL(0, "bare", &option_bare, N_("create a bare repository")),
  92         OPT_HIDDEN_BOOL(0, "naked", &option_bare,
  93                         N_("create a bare repository")),
  94         OPT_BOOL(0, "mirror", &option_mirror,
  95                  N_("create a mirror repository (implies bare)")),
  96         OPT_BOOL('l', "local", &option_local,
  97                 N_("to clone from a local repository")),
  98         OPT_BOOL(0, "no-hardlinks", &option_no_hardlinks,
  99                     N_("don't use local hardlinks, always copy")),
 100         OPT_BOOL('s', "shared", &option_shared,
 101                     N_("setup as shared repository")),
 102         OPT_ALIAS(0, "recursive", "recurse-submodules"),
 103         { OPTION_CALLBACK, 0, "recurse-submodules", &option_recurse_submodules,
 104           N_("pathspec"), N_("initialize submodules in the clone"),
 105           PARSE_OPT_OPTARG, recurse_submodules_cb, (intptr_t)"." },
 106         OPT_INTEGER('j', "jobs", &max_jobs,
 107                     N_("number of submodules cloned in parallel")),
 108         OPT_STRING(0, "template", &option_template, N_("template-directory"),
 109                    N_("directory from which templates will be used")),
 110         OPT_STRING_LIST(0, "reference", &option_required_reference, N_("repo"),
 111                         N_("reference repository")),
 112         OPT_STRING_LIST(0, "reference-if-able", &option_optional_reference,
 113                         N_("repo"), N_("reference repository")),
 114         OPT_BOOL(0, "dissociate", &option_dissociate,
 115                  N_("use --reference only while cloning")),
 116         OPT_STRING('o', "origin", &option_origin, N_("name"),
 117                    N_("use <name> instead of 'origin' to track upstream")),
 118         OPT_STRING('b', "branch", &option_branch, N_("branch"),
 119                    N_("checkout <branch> instead of the remote's HEAD")),
 120         OPT_STRING('u', "upload-pack", &option_upload_pack, N_("path"),
 121                    N_("path to git-upload-pack on the remote")),
 122         OPT_STRING(0, "depth", &option_depth, N_("depth"),
 123                     N_("create a shallow clone of that depth")),
 124         OPT_STRING(0, "shallow-since", &option_since, N_("time"),
 125                     N_("create a shallow clone since a specific time")),
 126         OPT_STRING_LIST(0, "shallow-exclude", &option_not, N_("revision"),
 127                         N_("deepen history of shallow clone, excluding rev")),
 128         OPT_BOOL(0, "single-branch", &option_single_branch,
 129                     N_("clone only one branch, HEAD or --branch")),
 130         OPT_BOOL(0, "no-tags", &option_no_tags,
 131                  N_("don't clone any tags, and make later fetches not to follow them")),
 132         OPT_BOOL(0, "shallow-submodules", &option_shallow_submodules,
 133                     N_("any cloned submodules will be shallow")),
 134         OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
 135                    N_("separate git dir from working tree")),
 136         OPT_STRING_LIST('c', "config", &option_config, N_("key=value"),
 137                         N_("set config inside the new repository")),
 138         OPT_STRING_LIST(0, "server-option", &server_options,
 139                         N_("server-specific"), N_("option to transmit")),
 140         OPT_SET_INT('4', "ipv4", &family, N_("use IPv4 addresses only"),
 141                         TRANSPORT_FAMILY_IPV4),
 142         OPT_SET_INT('6', "ipv6", &family, N_("use IPv6 addresses only"),
 143                         TRANSPORT_FAMILY_IPV6),
 144         OPT_PARSE_LIST_OBJECTS_FILTER(&filter_options),
 145         OPT_END()
 146 };
 147
 148 static const char *get_repo_path_1(struct strbuf *path, int *is_bundle)
 149 {
 150         static char *suffix[] = { "/.git", "", ".git/.git", ".git" };
 151         static char *bundle_suffix[] = { ".bundle", "" };
 152         size_t baselen = path->len;
 153         struct stat st;
 154         int i;
 155
 156         for (i = 0; i < ARRAY_SIZE(suffix); i++) {
 157                 strbuf_setlen(path, baselen);
 158                 strbuf_addstr(path, suffix[i]);
 159                 if (stat(path->buf, &st))
 160                         continue;
 161                 if (S_ISDIR(st.st_mode) && is_git_directory(path->buf)) {
 162                         *is_bundle = 0;
 163                         return path->buf;
 164                 } else if (S_ISREG(st.st_mode) && st.st_size > 8) {
 165                         /* Is it a "gitfile"? */
 166                         char signature[8];
 167                         const char *dst;
 168                         int len, fd = open(path->buf, O_RDONLY);
 169                         if (fd < 0)
 170                                 continue;
 171                         len = read_in_full(fd, signature, 8);
 172                         close(fd);
 173                         if (len != 8 || strncmp(signature, "gitdir: ", 8))
 174                                 continue;
 175                         dst = read_gitfile(path->buf);
 176                         if (dst) {
 177                                 *is_bundle = 0;
 178                                 return dst;
 179                         }
 180                 }
 181         }
 182
 183         for (i = 0; i < ARRAY_SIZE(bundle_suffix); i++) {
 184                 strbuf_setlen(path, baselen);
 185                 strbuf_addstr(path, bundle_suffix[i]);
 186                 if (!stat(path->buf, &st) && S_ISREG(st.st_mode)) {
 187                         *is_bundle = 1;
 188                         return path->buf;
 189                 }
 190         }
 191
 192         return NULL;
 193 }
 194
 195 static char *get_repo_path(const char *repo, int *is_bundle)
 196 {
 197         struct strbuf path = STRBUF_INIT;
 198         const char *raw;
 199         char *canon;
 200
 201         strbuf_addstr(&path, repo);
 202         raw = get_repo_path_1(&path, is_bundle);
 203         canon = raw ? absolute_pathdup(raw) : NULL;
 204         strbuf_release(&path);
 205         return canon;
 206 }
 207
 208 static char *guess_dir_name(const char *repo, int is_bundle, int is_bare)
 209 {
 210         const char *end = repo + strlen(repo), *start, *ptr;
 211         size_t len;
 212         char *dir;
 213
 214         /*
 215          * Skip scheme.
 216          */
 217         start = strstr(repo, "://");
 218         if (start == NULL)
 219                 start = repo;
 220         else
 221                 start += 3;
 222
 223         /*
 224          * Skip authentication data. The stripping does happen
 225          * greedily, such that we strip up to the last '@' inside
 226          * the host part.
 227          */
 228         for (ptr = start; ptr < end && !is_dir_sep(*ptr); ptr++) {
 229                 if (*ptr == '@')
 230                         start = ptr + 1;
 231         }
 232
 233         /*
 234          * Strip trailing spaces, slashes and /.git
 235          */
 236         while (start < end && (is_dir_sep(end[-1]) || isspace(end[-1])))
 237                 end--;
 238         if (end - start > 5 && is_dir_sep(end[-5]) &&
 239             !strncmp(end - 4, ".git", 4)) {
 240                 end -= 5;
 241                 while (start < end && is_dir_sep(end[-1]))
 242                         end--;
 243         }
 244
 245         /*
 246          * Strip trailing port number if we've got only a
 247          * hostname (that is, there is no dir separator but a
 248          * colon). This check is required such that we do not
 249          * strip URI's like '/foo/bar:2222.git', which should
 250          * result in a dir '2222' being guessed due to backwards
 251          * compatibility.
 252          */
 253         if (memchr(start, '/', end - start) == NULL
 254             && memchr(start, ':', end - start) != NULL) {
 255                 ptr = end;
 256                 while (start < ptr && isdigit(ptr[-1]) && ptr[-1] != ':')
 257                         ptr--;
 258                 if (start < ptr && ptr[-1] == ':')
 259                         end = ptr - 1;
 260         }
 261
 262         /*
 263          * Find last component. To remain backwards compatible we
 264          * also regard colons as path separators, such that
 265          * cloning a repository 'foo:bar.git' would result in a
 266          * directory 'bar' being guessed.
 267          */
 268         ptr = end;
 269         while (start < ptr && !is_dir_sep(ptr[-1]) && ptr[-1] != ':')
 270                 ptr--;
 271         start = ptr;
 272
 273         /*
 274          * Strip .{bundle,git}.
 275          */
 276         len = end - start;
 277         strip_suffix_mem(start, &len, is_bundle ? ".bundle" : ".git");
 278
 279         if (!len || (len == 1 && *start == '/'))
 280                 die(_("No directory name could be guessed.\n"
 281                       "Please specify a directory on the command line"));
 282
 283         if (is_bare)
 284                 dir = xstrfmt("%.*s.git", (int)len, start);
 285         else
 286                 dir = xstrndup(start, len);
 287         /*
 288          * Replace sequences of 'control' characters and whitespace
 289          * with one ascii space, remove leading and trailing spaces.
 290          */
 291         if (*dir) {
 292                 char *out = dir;
 293                 int prev_space = 1 /* strip leading whitespace */;
 294                 for (end = dir; *end; ++end) {
 295                         char ch = *end;
 296                         if ((unsigned char)ch < '\x20')
 297                                 ch = '\x20';
 298                         if (isspace(ch)) {
 299                                 if (prev_space)
 300                                         continue;
 301                                 prev_space = 1;
 302                         } else
 303                                 prev_space = 0;
 304                         *out++ = ch;
 305                 }
 306                 *out = '\0';
 307                 if (out > dir && prev_space)
 308                         out[-1] = '\0';
 309         }
 310         return dir;
 311 }
 312
 313 static void strip_trailing_slashes(char *dir)
 314 {
 315         char *end = dir + strlen(dir);
 316
 317         while (dir < end - 1 && is_dir_sep(end[-1]))
 318                 end--;
 319         *end = '\0';
 320 }
 321
 322 static int add_one_reference(struct string_list_item *item, void *cb_data)
 323 {
 324         struct strbuf err = STRBUF_INIT;
 325         int *required = cb_data;
 326         char *ref_git = compute_alternate_path(item->string, &err);
 327
 328         if (!ref_git) {
 329                 if (*required)
 330                         die("%s", err.buf);
 331                 else
 332                         fprintf(stderr,
 333                                 _("info: Could not add alternate for '%s': %s\n"),
 334                                 item->string, err.buf);
 335         } else {
 336                 struct strbuf sb = STRBUF_INIT;
 337                 strbuf_addf(&sb, "%s/objects", ref_git);
 338                 add_to_alternates_file(sb.buf);
 339                 strbuf_release(&sb);
 340         }
 341
 342         strbuf_release(&err);
 343         free(ref_git);
 344         return 0;
 345 }
 346
 347 static void setup_reference(void)
 348 {
 349         int required = 1;
 350         for_each_string_list(&option_required_reference,
 351                              add_one_reference, &required);
 352         required = 0;
 353         for_each_string_list(&option_optional_reference,
 354                              add_one_reference, &required);
 355 }
 356
 357 static void copy_alternates(struct strbuf *src, const char *src_repo)
 358 {
 359         /*
 360          * Read from the source objects/info/alternates file
 361          * and copy the entries to corresponding file in the
 362          * destination repository with add_to_alternates_file().
 363          * Both src and dst have "$path/objects/info/alternates".
 364          *
 365          * Instead of copying bit-for-bit from the original,
 366          * we need to append to existing one so that the already
 367          * created entry via "clone -s" is not lost, and also
 368          * to turn entries with paths relative to the original
 369          * absolute, so that they can be used in the new repository.
 370          */
 371         FILE *in = xfopen(src->buf, "r");
 372         struct strbuf line = STRBUF_INIT;
 373
 374         while (strbuf_getline(&line, in) != EOF) {
 375                 char *abs_path;
 376                 if (!line.len || line.buf[0] == '#')
 377                         continue;
 378                 if (is_absolute_path(line.buf)) {
 379                         add_to_alternates_file(line.buf);
 380                         continue;
 381                 }
 382                 abs_path = mkpathdup("%s/objects/%s", src_repo, line.buf);
 383                 if (!normalize_path_copy(abs_path, abs_path))
 384                         add_to_alternates_file(abs_path);
 385                 else
 386                         warning("skipping invalid relative alternate: %s/%s",
 387                                 src_repo, line.buf);
 388                 free(abs_path);
 389         }
 390         strbuf_release(&line);
 391         fclose(in);
 392 }
 393
 394 static void copy_or_link_directory(struct strbuf *src, struct strbuf *dest,
 395                                    const char *src_repo, int src_baselen)
 396 {
 397         struct dirent *de;
 398         struct stat buf;
 399         int src_len, dest_len;
 400         DIR *dir;
 401
 402         dir = opendir(src->buf);
 403         if (!dir)
 404                 die_errno(_("failed to open '%s'"), src->buf);
 405
 406         if (mkdir(dest->buf, 0777)) {
 407                 if (errno != EEXIST)
 408                         die_errno(_("failed to create directory '%s'"), dest->buf);
 409                 else if (stat(dest->buf, &buf))
 410                         die_errno(_("failed to stat '%s'"), dest->buf);
 411                 else if (!S_ISDIR(buf.st_mode))
 412                         die(_("%s exists and is not a directory"), dest->buf);
 413         }
 414
 415         strbuf_addch(src, '/');
 416         src_len = src->len;
 417         strbuf_addch(dest, '/');
 418         dest_len = dest->len;
 419
 420         while ((de = readdir(dir)) != NULL) {
 421                 strbuf_setlen(src, src_len);
 422                 strbuf_addstr(src, de->d_name);
 423                 strbuf_setlen(dest, dest_len);
 424                 strbuf_addstr(dest, de->d_name);
 425                 if (stat(src->buf, &buf)) {
 426                         warning (_("failed to stat %s\n"), src->buf);
 427                         continue;
 428                 }
 429                 if (S_ISDIR(buf.st_mode)) {
 430                         if (de->d_name[0] != '.')
 431                                 copy_or_link_directory(src, dest,
 432                                                        src_repo, src_baselen);
 433                         continue;
 434                 }
 435
 436                 /* Files that cannot be copied bit-for-bit... */
 437                 if (!strcmp(src->buf + src_baselen, "/info/alternates")) {
 438                         copy_alternates(src, src_repo);
 439                         continue;
 440                 }
 441
 442                 if (unlink(dest->buf) && errno != ENOENT)
 443                         die_errno(_("failed to unlink '%s'"), dest->buf);
 444                 if (!option_no_hardlinks) {
 445                         if (!link(src->buf, dest->buf))
 446                                 continue;
 447                         if (option_local > 0)
 448                                 die_errno(_("failed to create link '%s'"), dest->buf);
 449                         option_no_hardlinks = 1;
 450                 }
 451                 if (copy_file_with_time(dest->buf, src->buf, 0666))
 452                         die_errno(_("failed to copy file to '%s'"), dest->buf);
 453         }
 454         closedir(dir);
 455 }
 456
 457 static void clone_local(const char *src_repo, const char *dest_repo)
 458 {
 459         if (option_shared) {
 460                 struct strbuf alt = STRBUF_INIT;
 461                 get_common_dir(&alt, src_repo);
 462                 strbuf_addstr(&alt, "/objects");
 463                 add_to_alternates_file(alt.buf);
 464                 strbuf_release(&alt);
 465         } else {
 466                 struct strbuf src = STRBUF_INIT;
 467                 struct strbuf dest = STRBUF_INIT;
 468                 get_common_dir(&src, src_repo);
 469                 get_common_dir(&dest, dest_repo);
 470                 strbuf_addstr(&src, "/objects");
 471                 strbuf_addstr(&dest, "/objects");
 472                 copy_or_link_directory(&src, &dest, src_repo, src.len);
 473                 strbuf_release(&src);
 474                 strbuf_release(&dest);
 475         }
 476
 477         if (0 <= option_verbosity)
 478                 fprintf(stderr, _("done.\n"));
 479 }
 480
 481 static const char *junk_work_tree;
 482 static int junk_work_tree_flags;
 483 static const char *junk_git_dir;
 484 static int junk_git_dir_flags;
 485 static enum {
 486         JUNK_LEAVE_NONE,
 487         JUNK_LEAVE_REPO,
 488         JUNK_LEAVE_ALL
 489 } junk_mode = JUNK_LEAVE_NONE;
 490
 491 static const char junk_leave_repo_msg[] =
 492 N_("Clone succeeded, but checkout failed.\n"
 493    "You can inspect what was checked out with 'git status'\n"
 494    "and retry the checkout with 'git checkout -f HEAD'\n");
 495
 496 static void remove_junk(void)
 497 {
 498         struct strbuf sb = STRBUF_INIT;
 499
 500         switch (junk_mode) {
 501         case JUNK_LEAVE_REPO:
 502                 warning("%s", _(junk_leave_repo_msg));
 503                 /* fall-through */
 504         case JUNK_LEAVE_ALL:
 505                 return;
 506         default:
 507                 /* proceed to removal */
 508                 break;
 509         }
 510
 511         if (junk_git_dir) {
 512                 strbuf_addstr(&sb, junk_git_dir);
 513                 remove_dir_recursively(&sb, junk_git_dir_flags);
 514                 strbuf_reset(&sb);
 515         }
 516         if (junk_work_tree) {
 517                 strbuf_addstr(&sb, junk_work_tree);
 518                 remove_dir_recursively(&sb, junk_work_tree_flags);
 519         }
 520         strbuf_release(&sb);
 521 }
 522
 523 static void remove_junk_on_signal(int signo)
 524 {
 525         remove_junk();
 526         sigchain_pop(signo);
 527         raise(signo);
 528 }
 529
 530 static struct ref *find_remote_branch(const struct ref *refs, const char *branch)
 531 {
 532         struct ref *ref;
 533         struct strbuf head = STRBUF_INIT;
 534         strbuf_addstr(&head, "refs/heads/");
 535         strbuf_addstr(&head, branch);
 536         ref = find_ref_by_name(refs, head.buf);
 537         strbuf_release(&head);
 538
 539         if (ref)
 540                 return ref;
 541
 542         strbuf_addstr(&head, "refs/tags/");
 543         strbuf_addstr(&head, branch);
 544         ref = find_ref_by_name(refs, head.buf);
 545         strbuf_release(&head);
 546
 547         return ref;
 548 }
 549
 550 static struct ref *wanted_peer_refs(const struct ref *refs,
 551                 struct refspec *refspec)
 552 {
 553         struct ref *head = copy_ref(find_ref_by_name(refs, "HEAD"));
 554         struct ref *local_refs = head;
 555         struct ref **tail = head ? &head->next : &local_refs;
 556
 557         if (option_single_branch) {
 558                 struct ref *remote_head = NULL;
 559
 560                 if (!option_branch)
 561                         remote_head = guess_remote_head(head, refs, 0);
 562                 else {
 563                         local_refs = NULL;
 564                         tail = &local_refs;
 565                         remote_head = copy_ref(find_remote_branch(refs, option_branch));
 566                 }
 567
 568                 if (!remote_head && option_branch)
 569                         warning(_("Could not find remote branch %s to clone."),
 570                                 option_branch);
 571                 else {
 572                         int i;
 573                         for (i = 0; i < refspec->nr; i++)
 574                                 get_fetch_map(remote_head, &refspec->items[i],
 575                                               &tail, 0);
 576
 577                         /* if --branch=tag, pull the requested tag explicitly */
 578                         get_fetch_map(remote_head, tag_refspec, &tail, 0);
 579                 }
 580         } else {
 581                 int i;
 582                 for (i = 0; i < refspec->nr; i++)
 583                         get_fetch_map(refs, &refspec->items[i], &tail, 0);
 584         }
 585
 586         if (!option_mirror && !option_single_branch && !option_no_tags)
 587                 get_fetch_map(refs, tag_refspec, &tail, 0);
 588
 589         return local_refs;
 590 }
 591
 592 static void write_remote_refs(const struct ref *local_refs)
 593 {
 594         const struct ref *r;
 595
 596         struct ref_transaction *t;
 597         struct strbuf err = STRBUF_INIT;
 598
 599         t = ref_transaction_begin(&err);
 600         if (!t)
 601                 die("%s", err.buf);
 602
 603         for (r = local_refs; r; r = r->next) {
 604                 if (!r->peer_ref)
 605                         continue;
 606                 if (ref_transaction_create(t, r->peer_ref->name, &r->old_oid,
 607                                            0, NULL, &err))
 608                         die("%s", err.buf);
 609         }
 610
 611         if (initial_ref_transaction_commit(t, &err))
 612                 die("%s", err.buf);
 613
 614         strbuf_release(&err);
 615         ref_transaction_free(t);
 616 }
 617
 618 static void write_followtags(const struct ref *refs, const char *msg)
 619 {
 620         const struct ref *ref;
 621         for (ref = refs; ref; ref = ref->next) {
 622                 if (!starts_with(ref->name, "refs/tags/"))
 623                         continue;
 624                 if (ends_with(ref->name, "^{}"))
 625                         continue;
 626                 if (!has_object_file(&ref->old_oid))
 627                         continue;
 628                 update_ref(msg, ref->name, &ref->old_oid, NULL, 0,
 629                            UPDATE_REFS_DIE_ON_ERR);
 630         }
 631 }
 632
 633 static int iterate_ref_map(void *cb_data, struct object_id *oid)
 634 {
 635         struct ref **rm = cb_data;
 636         struct ref *ref = *rm;
 637
 638         /*
 639          * Skip anything missing a peer_ref, which we are not
 640          * actually going to write a ref for.
 641          */
 642         while (ref && !ref->peer_ref)
 643                 ref = ref->next;
 644         /* Returning -1 notes "end of list" to the caller. */
 645         if (!ref)
 646                 return -1;
 647
 648         oidcpy(oid, &ref->old_oid);
 649         *rm = ref->next;
 650         return 0;
 651 }
 652
 653 static void update_remote_refs(const struct ref *refs,
 654                                const struct ref *mapped_refs,
 655                                const struct ref *remote_head_points_at,
 656                                const char *branch_top,
 657                                const char *msg,
 658                                struct transport *transport,
 659                                int check_connectivity,
 660                                int check_refs_only)
 661 {
 662         const struct ref *rm = mapped_refs;
 663
 664         if (check_connectivity) {
 665                 struct check_connected_options opt = CHECK_CONNECTED_INIT;
 666
 667                 opt.transport = transport;
 668                 opt.progress = transport->progress;
 669                 opt.check_refs_only = !!check_refs_only;
 670
 671                 if (check_connected(iterate_ref_map, &rm, &opt))
 672                         die(_("remote did not send all necessary objects"));
 673         }
 674
 675         if (refs) {
 676                 write_remote_refs(mapped_refs);
 677                 if (option_single_branch && !option_no_tags)
 678                         write_followtags(refs, msg);
 679         }
 680
 681         if (remote_head_points_at && !option_bare) {
 682                 struct strbuf head_ref = STRBUF_INIT;
 683                 strbuf_addstr(&head_ref, branch_top);
 684                 strbuf_addstr(&head_ref, "HEAD");
 685                 if (create_symref(head_ref.buf,
 686                                   remote_head_points_at->peer_ref->name,
 687                                   msg) < 0)
 688                         die(_("unable to update %s"), head_ref.buf);
 689                 strbuf_release(&head_ref);
 690         }
 691 }
 692
 693 static void update_head(const struct ref *our, const struct ref *remote,
 694                         const char *msg)
 695 {
 696         const char *head;
 697         if (our && skip_prefix(our->name, "refs/heads/", &head)) {
 698                 /* Local default branch link */
 699                 if (create_symref("HEAD", our->name, NULL) < 0)
 700                         die(_("unable to update HEAD"));
 701                 if (!option_bare) {
 702                         update_ref(msg, "HEAD", &our->old_oid, NULL, 0,
 703                                    UPDATE_REFS_DIE_ON_ERR);
 704                         install_branch_config(0, head, option_origin, our->name);
 705                 }
 706         } else if (our) {
 707                 struct commit *c = lookup_commit_reference(the_repository,
 708                                                            &our->old_oid);
 709                 /* --branch specifies a non-branch (i.e. tags), detach HEAD */
 710                 update_ref(msg, "HEAD", &c->object.oid, NULL, REF_NO_DEREF,
 711                            UPDATE_REFS_DIE_ON_ERR);
 712         } else if (remote) {
 713                 /*
 714                  * We know remote HEAD points to a non-branch, or
 715                  * HEAD points to a branch but we don't know which one.
 716                  * Detach HEAD in all these cases.
 717                  */
 718                 update_ref(msg, "HEAD", &remote->old_oid, NULL, REF_NO_DEREF,
 719                            UPDATE_REFS_DIE_ON_ERR);
 720         }
 721 }
 722
 723 static int checkout(int submodule_progress)
 724 {
 725         struct object_id oid;
 726         char *head;
 727         struct lock_file lock_file = LOCK_INIT;
 728         struct unpack_trees_options opts;
 729         struct tree *tree;
 730         struct tree_desc t;
 731         int err = 0;
 732
 733         if (option_no_checkout)
 734                 return 0;
 735
 736         head = resolve_refdup("HEAD", RESOLVE_REF_READING, &oid, NULL);
 737         if (!head) {
 738                 warning(_("remote HEAD refers to nonexistent ref, "
 739                           "unable to checkout.\n"));
 740                 return 0;
 741         }
 742         if (!strcmp(head, "HEAD")) {
 743                 if (advice_detached_head)
 744                         detach_advice(oid_to_hex(&oid));
 745         } else {
 746                 if (!starts_with(head, "refs/heads/"))
 747                         die(_("HEAD not found below refs/heads!"));
 748         }
 749         free(head);
 750
 751         /* We need to be in the new work tree for the checkout */
 752         setup_work_tree();
 753
 754         hold_locked_index(&lock_file, LOCK_DIE_ON_ERROR);
 755
 756         memset(&opts, 0, sizeof opts);
 757         opts.update = 1;
 758         opts.merge = 1;
 759         opts.clone = 1;
 760         opts.fn = oneway_merge;
 761         opts.verbose_update = (option_verbosity >= 0);
 762         opts.src_index = &the_index;
 763         opts.dst_index = &the_index;
 764
 765         tree = parse_tree_indirect(&oid);
 766         parse_tree(tree);
 767         init_tree_desc(&t, tree->buffer, tree->size);
 768         if (unpack_trees(1, &t, &opts) < 0)
 769                 die(_("unable to checkout working tree"));
 770
 771         if (write_locked_index(&the_index, &lock_file, COMMIT_LOCK))
 772                 die(_("unable to write new index file"));
 773
 774         err |= run_hook_le(NULL, "post-checkout", sha1_to_hex(null_sha1),
 775                            oid_to_hex(&oid), "1", NULL);
 776
 777         if (!err && (option_recurse_submodules.nr > 0)) {
 778                 struct argv_array args = ARGV_ARRAY_INIT;
 779                 argv_array_pushl(&args, "submodule", "update", "--init", "--recursive", NULL);
 780
 781                 if (option_shallow_submodules == 1)
 782                         argv_array_push(&args, "--depth=1");
 783
 784                 if (max_jobs != -1)
 785                         argv_array_pushf(&args, "--jobs=%d", max_jobs);
 786
 787                 if (submodule_progress)
 788                         argv_array_push(&args, "--progress");
 789
 790                 if (option_verbosity < 0)
 791                         argv_array_push(&args, "--quiet");
 792
 793                 err = run_command_v_opt(args.argv, RUN_GIT_CMD);
 794                 argv_array_clear(&args);
 795         }
 796
 797         return err;
 798 }
 799
 800 static int write_one_config(const char *key, const char *value, void *data)
 801 {
 802         return git_config_set_multivar_gently(key,
 803                                               value ? value : "true",
 804                                               CONFIG_REGEX_NONE, 0);
 805 }
 806
 807 static void write_config(struct string_list *config)
 808 {
 809         int i;
 810
 811         for (i = 0; i < config->nr; i++) {
 812                 if (git_config_parse_parameter(config->items[i].string,
 813                                                write_one_config, NULL) < 0)
 814                         die(_("unable to write parameters to config file"));
 815         }
 816 }
 817
 818 static void write_refspec_config(const char *src_ref_prefix,
 819                 const struct ref *our_head_points_at,
 820                 const struct ref *remote_head_points_at,
 821                 struct strbuf *branch_top)
 822 {
 823         struct strbuf key = STRBUF_INIT;
 824         struct strbuf value = STRBUF_INIT;
 825
 826         if (option_mirror || !option_bare) {
 827                 if (option_single_branch && !option_mirror) {
 828                         if (option_branch) {
 829                                 if (starts_with(our_head_points_at->name, "refs/tags/"))
 830                                         strbuf_addf(&value, "+%s:%s", our_head_points_at->name,
 831                                                 our_head_points_at->name);
 832                                 else
 833                                         strbuf_addf(&value, "+%s:%s%s", our_head_points_at->name,
 834                                                 branch_top->buf, option_branch);
 835                         } else if (remote_head_points_at) {
 836                                 const char *head = remote_head_points_at->name;
 837                                 if (!skip_prefix(head, "refs/heads/", &head))
 838                                         BUG("remote HEAD points at non-head?");
 839
 840                                 strbuf_addf(&value, "+%s:%s%s", remote_head_points_at->name,
 841                                                 branch_top->buf, head);
 842                         }
 843                         /*
 844                          * otherwise, the next "git fetch" will
 845                          * simply fetch from HEAD without updating
 846                          * any remote-tracking branch, which is what
 847                          * we want.
 848                          */
 849                 } else {
 850                         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top->buf);
 851                 }
 852                 /* Configure the remote */
 853                 if (value.len) {
 854                         strbuf_addf(&key, "remote.%s.fetch", option_origin);
 855                         git_config_set_multivar(key.buf, value.buf, "^$", 0);
 856                         strbuf_reset(&key);
 857
 858                         if (option_mirror) {
 859                                 strbuf_addf(&key, "remote.%s.mirror", option_origin);
 860                                 git_config_set(key.buf, "true");
 861                                 strbuf_reset(&key);
 862                         }
 863                 }
 864         }
 865
 866         strbuf_release(&key);
 867         strbuf_release(&value);
 868 }
 869
 870 static void dissociate_from_references(void)
 871 {
 872         static const char* argv[] = { "repack", "-a", "-d", NULL };
 873         char *alternates = git_pathdup("objects/info/alternates");
 874
 875         if (!access(alternates, F_OK)) {
 876                 if (run_command_v_opt(argv, RUN_GIT_CMD|RUN_COMMAND_NO_STDIN))
 877                         die(_("cannot repack to clean up"));
 878                 if (unlink(alternates) && errno != ENOENT)
 879                         die_errno(_("cannot unlink temporary alternates file"));
 880         }
 881         free(alternates);
 882 }
 883
 884 static int dir_exists(const char *path)
 885 {
 886         struct stat sb;
 887         return !stat(path, &sb);
 888 }
 889
 890 int cmd_clone(int argc, const char **argv, const char *prefix)
 891 {
 892         int is_bundle = 0, is_local;
 893         const char *repo_name, *repo, *work_tree, *git_dir;
 894         char *path, *dir;
 895         int dest_exists;
 896         const struct ref *refs, *remote_head;
 897         const struct ref *remote_head_points_at;
 898         const struct ref *our_head_points_at;
 899         struct ref *mapped_refs;
 900         const struct ref *ref;
 901         struct strbuf key = STRBUF_INIT;
 902         struct strbuf default_refspec = STRBUF_INIT;
 903         struct strbuf branch_top = STRBUF_INIT, reflog_msg = STRBUF_INIT;
 904         struct transport *transport = NULL;
 905         const char *src_ref_prefix = "refs/heads/";
 906         struct remote *remote;
 907         int err = 0, complete_refs_before_fetch = 1;
 908         int submodule_progress;
 909
 910         struct argv_array ref_prefixes = ARGV_ARRAY_INIT;
 911
 912         fetch_if_missing = 0;
 913
 914         packet_trace_identity("clone");
 915         argc = parse_options(argc, argv, prefix, builtin_clone_options,
 916                              builtin_clone_usage, 0);
 917
 918         if (argc > 2)
 919                 usage_msg_opt(_("Too many arguments."),
 920                         builtin_clone_usage, builtin_clone_options);
 921
 922         if (argc == 0)
 923                 usage_msg_opt(_("You must specify a repository to clone."),
 924                         builtin_clone_usage, builtin_clone_options);
 925
 926         if (option_depth || option_since || option_not.nr)
 927                 deepen = 1;
 928         if (option_single_branch == -1)
 929                 option_single_branch = deepen ? 1 : 0;
 930
 931         if (option_mirror)
 932                 option_bare = 1;
 933
 934         if (option_bare) {
 935                 if (option_origin)
 936                         die(_("--bare and --origin %s options are incompatible."),
 937                             option_origin);
 938                 if (real_git_dir)
 939                         die(_("--bare and --separate-git-dir are incompatible."));
 940                 option_no_checkout = 1;
 941         }
 942
 943         if (!option_origin)
 944                 option_origin = "origin";
 945
 946         repo_name = argv[0];
 947
 948         path = get_repo_path(repo_name, &is_bundle);
 949         if (path)
 950                 repo = absolute_pathdup(repo_name);
 951         else if (!strchr(repo_name, ':'))
 952                 die(_("repository '%s' does not exist"), repo_name);
 953         else
 954                 repo = repo_name;
 955
 956         /* no need to be strict, transport_set_option() will validate it again */
 957         if (option_depth && atoi(option_depth) < 1)
 958                 die(_("depth %s is not a positive number"), option_depth);
 959
 960         if (argc == 2)
 961                 dir = xstrdup(argv[1]);
 962         else
 963                 dir = guess_dir_name(repo_name, is_bundle, option_bare);
 964         strip_trailing_slashes(dir);
 965
 966         dest_exists = dir_exists(dir);
 967         if (dest_exists && !is_empty_dir(dir))
 968                 die(_("destination path '%s' already exists and is not "
 969                         "an empty directory."), dir);
 970
 971         strbuf_addf(&reflog_msg, "clone: from %s", repo);
 972
 973         if (option_bare)
 974                 work_tree = NULL;
 975         else {
 976                 work_tree = getenv("GIT_WORK_TREE");
 977                 if (work_tree && dir_exists(work_tree))
 978                         die(_("working tree '%s' already exists."), work_tree);
 979         }
 980
 981         if (option_bare || work_tree)
 982                 git_dir = xstrdup(dir);
 983         else {
 984                 work_tree = dir;
 985                 git_dir = mkpathdup("%s/.git", dir);
 986         }
 987
 988         atexit(remove_junk);
 989         sigchain_push_common(remove_junk_on_signal);
 990
 991         if (!option_bare) {
 992                 if (safe_create_leading_directories_const(work_tree) < 0)
 993                         die_errno(_("could not create leading directories of '%s'"),
 994                                   work_tree);
 995                 if (dest_exists)
 996                         junk_work_tree_flags |= REMOVE_DIR_KEEP_TOPLEVEL;
 997                 else if (mkdir(work_tree, 0777))
 998                         die_errno(_("could not create work tree dir '%s'"),
 999                                   work_tree);
1000                 junk_work_tree = work_tree;
1001                 set_git_work_tree(work_tree);
1002         }
1003
1004         if (real_git_dir) {
1005                 if (dir_exists(real_git_dir))
1006                         junk_git_dir_flags |= REMOVE_DIR_KEEP_TOPLEVEL;
1007                 junk_git_dir = real_git_dir;
1008         } else {
1009                 if (dest_exists)
1010                         junk_git_dir_flags |= REMOVE_DIR_KEEP_TOPLEVEL;
1011                 junk_git_dir = git_dir;
1012         }
1013         if (safe_create_leading_directories_const(git_dir) < 0)
1014                 die(_("could not create leading directories of '%s'"), git_dir);
1015
1016         if (0 <= option_verbosity) {
1017                 if (option_bare)
1018                         fprintf(stderr, _("Cloning into bare repository '%s'...\n"), dir);
1019                 else
1020                         fprintf(stderr, _("Cloning into '%s'...\n"), dir);
1021         }
1022
1023         if (option_recurse_submodules.nr > 0) {
1024                 struct string_list_item *item;
1025                 struct strbuf sb = STRBUF_INIT;
1026
1027                 /* remove duplicates */
1028                 string_list_sort(&option_recurse_submodules);
1029                 string_list_remove_duplicates(&option_recurse_submodules, 0);
1030
1031                 /*
1032                  * NEEDSWORK: In a multi-working-tree world, this needs to be
1033                  * set in the per-worktree config.
1034                  */
1035                 for_each_string_list_item(item, &option_recurse_submodules) {
1036                         strbuf_addf(&sb, "submodule.active=%s",
1037                                     item->string);
1038                         string_list_append(&option_config,
1039                                            strbuf_detach(&sb, NULL));
1040                 }
1041
1042                 if (option_required_reference.nr &&
1043                     option_optional_reference.nr)
1044                         die(_("clone --recursive is not compatible with "
1045                               "both --reference and --reference-if-able"));
1046                 else if (option_required_reference.nr) {
1047                         string_list_append(&option_config,
1048                                 "submodule.alternateLocation=superproject");
1049                         string_list_append(&option_config,
1050                                 "submodule.alternateErrorStrategy=die");
1051                 } else if (option_optional_reference.nr) {
1052                         string_list_append(&option_config,
1053                                 "submodule.alternateLocation=superproject");
1054                         string_list_append(&option_config,
1055                                 "submodule.alternateErrorStrategy=info");
1056                 }
1057         }
1058
1059         init_db(git_dir, real_git_dir, option_template, INIT_DB_QUIET);
1060
1061         if (real_git_dir)
1062                 git_dir = real_git_dir;
1063
1064         write_config(&option_config);
1065
1066         git_config(git_default_config, NULL);
1067
1068         if (option_bare) {
1069                 if (option_mirror)
1070                         src_ref_prefix = "refs/";
1071                 strbuf_addstr(&branch_top, src_ref_prefix);
1072
1073                 git_config_set("core.bare", "true");
1074         } else {
1075                 strbuf_addf(&branch_top, "refs/remotes/%s/", option_origin);
1076         }
1077
1078         strbuf_addf(&key, "remote.%s.url", option_origin);
1079         git_config_set(key.buf, repo);
1080         strbuf_reset(&key);
1081
1082         if (option_no_tags) {
1083                 strbuf_addf(&key, "remote.%s.tagOpt", option_origin);
1084                 git_config_set(key.buf, "--no-tags");
1085                 strbuf_reset(&key);
1086         }
1087
1088         if (option_required_reference.nr || option_optional_reference.nr)
1089                 setup_reference();
1090
1091         remote = remote_get(option_origin);
1092
1093         strbuf_addf(&default_refspec, "+%s*:%s*", src_ref_prefix,
1094                     branch_top.buf);
1095         refspec_append(&remote->fetch, default_refspec.buf);
1096
1097         transport = transport_get(remote, remote->url[0]);
1098         transport_set_verbosity(transport, option_verbosity, option_progress);
1099         transport->family = family;
1100
1101         path = get_repo_path(remote->url[0], &is_bundle);
1102         is_local = option_local != 0 && path && !is_bundle;
1103         if (is_local) {
1104                 if (option_depth)
1105                         warning(_("--depth is ignored in local clones; use file:// instead."));
1106                 if (option_since)
1107                         warning(_("--shallow-since is ignored in local clones; use file:// instead."));
1108                 if (option_not.nr)
1109                         warning(_("--shallow-exclude is ignored in local clones; use file:// instead."));
1110                 if (filter_options.choice)
1111                         warning(_("--filter is ignored in local clones; use file:// instead."));
1112                 if (!access(mkpath("%s/shallow", path), F_OK)) {
1113                         if (option_local > 0)
1114                                 warning(_("source repository is shallow, ignoring --local"));
1115                         is_local = 0;
1116                 }
1117         }
1118         if (option_local > 0 && !is_local)
1119                 warning(_("--local is ignored"));
1120         transport->cloning = 1;
1121
1122         transport_set_option(transport, TRANS_OPT_KEEP, "yes");
1123
1124         if (option_depth)
1125                 transport_set_option(transport, TRANS_OPT_DEPTH,
1126                                      option_depth);
1127         if (option_since)
1128                 transport_set_option(transport, TRANS_OPT_DEEPEN_SINCE,
1129                                      option_since);
1130         if (option_not.nr)
1131                 transport_set_option(transport, TRANS_OPT_DEEPEN_NOT,
1132                                      (const char *)&option_not);
1133         if (option_single_branch)
1134                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
1135
1136         if (option_upload_pack)
1137                 transport_set_option(transport, TRANS_OPT_UPLOADPACK,
1138                                      option_upload_pack);
1139
1140         if (server_options.nr)
1141                 transport->server_options = &server_options;
1142
1143         if (filter_options.choice) {
1144                 struct strbuf expanded_filter_spec = STRBUF_INIT;
1145                 expand_list_objects_filter_spec(&filter_options,
1146                                                 &expanded_filter_spec);
1147                 transport_set_option(transport, TRANS_OPT_LIST_OBJECTS_FILTER,
1148                                      expanded_filter_spec.buf);
1149                 transport_set_option(transport, TRANS_OPT_FROM_PROMISOR, "1");
1150                 strbuf_release(&expanded_filter_spec);
1151         }
1152
1153         if (transport->smart_options && !deepen && !filter_options.choice)
1154                 transport->smart_options->check_self_contained_and_connected = 1;
1155
1156
1157         argv_array_push(&ref_prefixes, "HEAD");
1158         refspec_ref_prefixes(&remote->fetch, &ref_prefixes);
1159         if (option_branch)
1160                 expand_ref_prefix(&ref_prefixes, option_branch);
1161         if (!option_no_tags)
1162                 argv_array_push(&ref_prefixes, "refs/tags/");
1163
1164         refs = transport_get_remote_refs(transport, &ref_prefixes);
1165
1166         if (refs) {
1167                 mapped_refs = wanted_peer_refs(refs, &remote->fetch);
1168                 /*
1169                  * transport_get_remote_refs() may return refs with null sha-1
1170                  * in mapped_refs (see struct transport->get_refs_list
1171                  * comment). In that case we need fetch it early because
1172                  * remote_head code below relies on it.
1173                  *
1174                  * for normal clones, transport_get_remote_refs() should
1175                  * return reliable ref set, we can delay cloning until after
1176                  * remote HEAD check.
1177                  */
1178                 for (ref = refs; ref; ref = ref->next)
1179                         if (is_null_oid(&ref->old_oid)) {
1180                                 complete_refs_before_fetch = 0;
1181                                 break;
1182                         }
1183
1184                 if (!is_local && !complete_refs_before_fetch)
1185                         transport_fetch_refs(transport, mapped_refs);
1186
1187                 remote_head = find_ref_by_name(refs, "HEAD");
1188                 remote_head_points_at =
1189                         guess_remote_head(remote_head, mapped_refs, 0);
1190
1191                 if (option_branch) {
1192                         our_head_points_at =
1193                                 find_remote_branch(mapped_refs, option_branch);
1194
1195                         if (!our_head_points_at)
1196                                 die(_("Remote branch %s not found in upstream %s"),
1197                                     option_branch, option_origin);
1198                 }
1199                 else
1200                         our_head_points_at = remote_head_points_at;
1201         }
1202         else {
1203                 if (option_branch)
1204                         die(_("Remote branch %s not found in upstream %s"),
1205                                         option_branch, option_origin);
1206
1207                 warning(_("You appear to have cloned an empty repository."));
1208                 mapped_refs = NULL;
1209                 our_head_points_at = NULL;
1210                 remote_head_points_at = NULL;
1211                 remote_head = NULL;
1212                 option_no_checkout = 1;
1213                 if (!option_bare)
1214                         install_branch_config(0, "master", option_origin,
1215                                               "refs/heads/master");
1216         }
1217
1218         write_refspec_config(src_ref_prefix, our_head_points_at,
1219                         remote_head_points_at, &branch_top);
1220
1221         if (filter_options.choice)
1222                 partial_clone_register("origin", &filter_options);
1223
1224         if (is_local)
1225                 clone_local(path, git_dir);
1226         else if (refs && complete_refs_before_fetch)
1227                 transport_fetch_refs(transport, mapped_refs);
1228
1229         update_remote_refs(refs, mapped_refs, remote_head_points_at,
1230                            branch_top.buf, reflog_msg.buf, transport,
1231                            !is_local, filter_options.choice);
1232
1233         update_head(our_head_points_at, remote_head, reflog_msg.buf);
1234
1235         /*
1236          * We want to show progress for recursive submodule clones iff
1237          * we did so for the main clone. But only the transport knows
1238          * the final decision for this flag, so we need to rescue the value
1239          * before we free the transport.
1240          */
1241         submodule_progress = transport->progress;
1242
1243         transport_unlock_pack(transport);
1244         transport_disconnect(transport);
1245
1246         if (option_dissociate) {
1247                 close_all_packs(the_repository->objects);
1248                 dissociate_from_references();
1249         }
1250
1251         junk_mode = JUNK_LEAVE_REPO;
1252         fetch_if_missing = 1;
1253         err = checkout(submodule_progress);
1254
1255         strbuf_release(&reflog_msg);
1256         strbuf_release(&branch_top);
1257         strbuf_release(&key);
1258         strbuf_release(&default_refspec);
1259         junk_mode = JUNK_LEAVE_ALL;
1260
1261         argv_array_clear(&ref_prefixes);
1262         return err;
1263 }