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 "parse-options.h"
  13 #include "fetch-pack.h"
  14 #include "refs.h"
  15 #include "tree.h"
  16 #include "tree-walk.h"
  17 #include "unpack-trees.h"
  18 #include "transport.h"
  19 #include "strbuf.h"
  20 #include "dir.h"
  21 #include "pack-refs.h"
  22 #include "sigchain.h"
  23 #include "branch.h"
  24 #include "remote.h"
  25 #include "run-command.h"
  26 #include "connected.h"
  27
  28 /*
  29  * Overall FIXMEs:
  30  *  - respect DB_ENVIRONMENT for .git/objects.
  31  *
  32  * Implementation notes:
  33  *  - dropping use-separate-remote and no-separate-remote compatibility
  34  *
  35  */
  36 static const char * const builtin_clone_usage[] = {
  37         N_("git clone [options] [--] <repo> [<dir>]"),
  38         NULL
  39 };
  40
  41 static int option_no_checkout, option_bare, option_mirror, option_single_branch = -1;
  42 static int option_local = -1, option_no_hardlinks, option_shared, option_recursive;
  43 static char *option_template, *option_depth;
  44 static char *option_origin = NULL;
  45 static char *option_branch = NULL;
  46 static const char *real_git_dir;
  47 static char *option_upload_pack = "git-upload-pack";
  48 static int option_verbosity;
  49 static int option_progress = -1;
  50 static struct string_list option_config;
  51 static struct string_list option_reference;
  52
  53 static int opt_parse_reference(const struct option *opt, const char *arg, int unset)
  54 {
  55         struct string_list *option_reference = opt->value;
  56         if (!arg)
  57                 return -1;
  58         string_list_append(option_reference, arg);
  59         return 0;
  60 }
  61
  62 static struct option builtin_clone_options[] = {
  63         OPT__VERBOSITY(&option_verbosity),
  64         OPT_BOOL(0, "progress", &option_progress,
  65                  N_("force progress reporting")),
  66         OPT_BOOLEAN('n', "no-checkout", &option_no_checkout,
  67                     N_("don't create a checkout")),
  68         OPT_BOOLEAN(0, "bare", &option_bare, N_("create a bare repository")),
  69         { OPTION_BOOLEAN, 0, "naked", &option_bare, NULL,
  70                 N_("create a bare repository"),
  71                 PARSE_OPT_NOARG | PARSE_OPT_HIDDEN },
  72         OPT_BOOLEAN(0, "mirror", &option_mirror,
  73                     N_("create a mirror repository (implies bare)")),
  74         OPT_BOOL('l', "local", &option_local,
  75                 N_("to clone from a local repository")),
  76         OPT_BOOLEAN(0, "no-hardlinks", &option_no_hardlinks,
  77                     N_("don't use local hardlinks, always copy")),
  78         OPT_BOOLEAN('s', "shared", &option_shared,
  79                     N_("setup as shared repository")),
  80         OPT_BOOLEAN(0, "recursive", &option_recursive,
  81                     N_("initialize submodules in the clone")),
  82         OPT_BOOLEAN(0, "recurse-submodules", &option_recursive,
  83                     N_("initialize submodules in the clone")),
  84         OPT_STRING(0, "template", &option_template, N_("template-directory"),
  85                    N_("directory from which templates will be used")),
  86         OPT_CALLBACK(0 , "reference", &option_reference, N_("repo"),
  87                      N_("reference repository"), &opt_parse_reference),
  88         OPT_STRING('o', "origin", &option_origin, N_("name"),
  89                    N_("use <name> instead of 'origin' to track upstream")),
  90         OPT_STRING('b', "branch", &option_branch, N_("branch"),
  91                    N_("checkout <branch> instead of the remote's HEAD")),
  92         OPT_STRING('u', "upload-pack", &option_upload_pack, N_("path"),
  93                    N_("path to git-upload-pack on the remote")),
  94         OPT_STRING(0, "depth", &option_depth, N_("depth"),
  95                     N_("create a shallow clone of that depth")),
  96         OPT_BOOL(0, "single-branch", &option_single_branch,
  97                     N_("clone only one branch, HEAD or --branch")),
  98         OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
  99                    N_("separate git dir from working tree")),
 100         OPT_STRING_LIST('c', "config", &option_config, N_("key=value"),
 101                         N_("set config inside the new repository")),
 102         OPT_END()
 103 };
 104
 105 static const char *argv_submodule[] = {
 106         "submodule", "update", "--init", "--recursive", NULL
 107 };
 108
 109 static char *get_repo_path(const char *repo, int *is_bundle)
 110 {
 111         static char *suffix[] = { "/.git", "", ".git/.git", ".git" };
 112         static char *bundle_suffix[] = { ".bundle", "" };
 113         struct stat st;
 114         int i;
 115
 116         for (i = 0; i < ARRAY_SIZE(suffix); i++) {
 117                 const char *path;
 118                 path = mkpath("%s%s", repo, suffix[i]);
 119                 if (stat(path, &st))
 120                         continue;
 121                 if (S_ISDIR(st.st_mode) && is_git_directory(path)) {
 122                         *is_bundle = 0;
 123                         return xstrdup(absolute_path(path));
 124                 } else if (S_ISREG(st.st_mode) && st.st_size > 8) {
 125                         /* Is it a "gitfile"? */
 126                         char signature[8];
 127                         int len, fd = open(path, O_RDONLY);
 128                         if (fd < 0)
 129                                 continue;
 130                         len = read_in_full(fd, signature, 8);
 131                         close(fd);
 132                         if (len != 8 || strncmp(signature, "gitdir: ", 8))
 133                                 continue;
 134                         path = read_gitfile(path);
 135                         if (path) {
 136                                 *is_bundle = 0;
 137                                 return xstrdup(absolute_path(path));
 138                         }
 139                 }
 140         }
 141
 142         for (i = 0; i < ARRAY_SIZE(bundle_suffix); i++) {
 143                 const char *path;
 144                 path = mkpath("%s%s", repo, bundle_suffix[i]);
 145                 if (!stat(path, &st) && S_ISREG(st.st_mode)) {
 146                         *is_bundle = 1;
 147                         return xstrdup(absolute_path(path));
 148                 }
 149         }
 150
 151         return NULL;
 152 }
 153
 154 static char *guess_dir_name(const char *repo, int is_bundle, int is_bare)
 155 {
 156         const char *end = repo + strlen(repo), *start;
 157         char *dir;
 158
 159         /*
 160          * Strip trailing spaces, slashes and /.git
 161          */
 162         while (repo < end && (is_dir_sep(end[-1]) || isspace(end[-1])))
 163                 end--;
 164         if (end - repo > 5 && is_dir_sep(end[-5]) &&
 165             !strncmp(end - 4, ".git", 4)) {
 166                 end -= 5;
 167                 while (repo < end && is_dir_sep(end[-1]))
 168                         end--;
 169         }
 170
 171         /*
 172          * Find last component, but be prepared that repo could have
 173          * the form  "remote.example.com:foo.git", i.e. no slash
 174          * in the directory part.
 175          */
 176         start = end;
 177         while (repo < start && !is_dir_sep(start[-1]) && start[-1] != ':')
 178                 start--;
 179
 180         /*
 181          * Strip .{bundle,git}.
 182          */
 183         if (is_bundle) {
 184                 if (end - start > 7 && !strncmp(end - 7, ".bundle", 7))
 185                         end -= 7;
 186         } else {
 187                 if (end - start > 4 && !strncmp(end - 4, ".git", 4))
 188                         end -= 4;
 189         }
 190
 191         if (is_bare) {
 192                 struct strbuf result = STRBUF_INIT;
 193                 strbuf_addf(&result, "%.*s.git", (int)(end - start), start);
 194                 dir = strbuf_detach(&result, NULL);
 195         } else
 196                 dir = xstrndup(start, end - start);
 197         /*
 198          * Replace sequences of 'control' characters and whitespace
 199          * with one ascii space, remove leading and trailing spaces.
 200          */
 201         if (*dir) {
 202                 char *out = dir;
 203                 int prev_space = 1 /* strip leading whitespace */;
 204                 for (end = dir; *end; ++end) {
 205                         char ch = *end;
 206                         if ((unsigned char)ch < '\x20')
 207                                 ch = '\x20';
 208                         if (isspace(ch)) {
 209                                 if (prev_space)
 210                                         continue;
 211                                 prev_space = 1;
 212                         } else
 213                                 prev_space = 0;
 214                         *out++ = ch;
 215                 }
 216                 *out = '\0';
 217                 if (out > dir && prev_space)
 218                         out[-1] = '\0';
 219         }
 220         return dir;
 221 }
 222
 223 static void strip_trailing_slashes(char *dir)
 224 {
 225         char *end = dir + strlen(dir);
 226
 227         while (dir < end - 1 && is_dir_sep(end[-1]))
 228                 end--;
 229         *end = '\0';
 230 }
 231
 232 static int add_one_reference(struct string_list_item *item, void *cb_data)
 233 {
 234         char *ref_git;
 235         struct strbuf alternate = STRBUF_INIT;
 236
 237         /* Beware: real_path() and mkpath() return static buffer */
 238         ref_git = xstrdup(real_path(item->string));
 239         if (is_directory(mkpath("%s/.git/objects", ref_git))) {
 240                 char *ref_git_git = mkpathdup("%s/.git", ref_git);
 241                 free(ref_git);
 242                 ref_git = ref_git_git;
 243         } else if (!is_directory(mkpath("%s/objects", ref_git)))
 244                 die(_("reference repository '%s' is not a local directory."),
 245                     item->string);
 246
 247         strbuf_addf(&alternate, "%s/objects", ref_git);
 248         add_to_alternates_file(alternate.buf);
 249         strbuf_release(&alternate);
 250         free(ref_git);
 251         return 0;
 252 }
 253
 254 static void setup_reference(void)
 255 {
 256         for_each_string_list(&option_reference, add_one_reference, NULL);
 257 }
 258
 259 static void copy_alternates(struct strbuf *src, struct strbuf *dst,
 260                             const char *src_repo)
 261 {
 262         /*
 263          * Read from the source objects/info/alternates file
 264          * and copy the entries to corresponding file in the
 265          * destination repository with add_to_alternates_file().
 266          * Both src and dst have "$path/objects/info/alternates".
 267          *
 268          * Instead of copying bit-for-bit from the original,
 269          * we need to append to existing one so that the already
 270          * created entry via "clone -s" is not lost, and also
 271          * to turn entries with paths relative to the original
 272          * absolute, so that they can be used in the new repository.
 273          */
 274         FILE *in = fopen(src->buf, "r");
 275         struct strbuf line = STRBUF_INIT;
 276
 277         while (strbuf_getline(&line, in, '\n') != EOF) {
 278                 char *abs_path, abs_buf[PATH_MAX];
 279                 if (!line.len || line.buf[0] == '#')
 280                         continue;
 281                 if (is_absolute_path(line.buf)) {
 282                         add_to_alternates_file(line.buf);
 283                         continue;
 284                 }
 285                 abs_path = mkpath("%s/objects/%s", src_repo, line.buf);
 286                 normalize_path_copy(abs_buf, abs_path);
 287                 add_to_alternates_file(abs_buf);
 288         }
 289         strbuf_release(&line);
 290         fclose(in);
 291 }
 292
 293 static void copy_or_link_directory(struct strbuf *src, struct strbuf *dest,
 294                                    const char *src_repo, int src_baselen)
 295 {
 296         struct dirent *de;
 297         struct stat buf;
 298         int src_len, dest_len;
 299         DIR *dir;
 300
 301         dir = opendir(src->buf);
 302         if (!dir)
 303                 die_errno(_("failed to open '%s'"), src->buf);
 304
 305         if (mkdir(dest->buf, 0777)) {
 306                 if (errno != EEXIST)
 307                         die_errno(_("failed to create directory '%s'"), dest->buf);
 308                 else if (stat(dest->buf, &buf))
 309                         die_errno(_("failed to stat '%s'"), dest->buf);
 310                 else if (!S_ISDIR(buf.st_mode))
 311                         die(_("%s exists and is not a directory"), dest->buf);
 312         }
 313
 314         strbuf_addch(src, '/');
 315         src_len = src->len;
 316         strbuf_addch(dest, '/');
 317         dest_len = dest->len;
 318
 319         while ((de = readdir(dir)) != NULL) {
 320                 strbuf_setlen(src, src_len);
 321                 strbuf_addstr(src, de->d_name);
 322                 strbuf_setlen(dest, dest_len);
 323                 strbuf_addstr(dest, de->d_name);
 324                 if (stat(src->buf, &buf)) {
 325                         warning (_("failed to stat %s\n"), src->buf);
 326                         continue;
 327                 }
 328                 if (S_ISDIR(buf.st_mode)) {
 329                         if (de->d_name[0] != '.')
 330                                 copy_or_link_directory(src, dest,
 331                                                        src_repo, src_baselen);
 332                         continue;
 333                 }
 334
 335                 /* Files that cannot be copied bit-for-bit... */
 336                 if (!strcmp(src->buf + src_baselen, "/info/alternates")) {
 337                         copy_alternates(src, dest, src_repo);
 338                         continue;
 339                 }
 340
 341                 if (unlink(dest->buf) && errno != ENOENT)
 342                         die_errno(_("failed to unlink '%s'"), dest->buf);
 343                 if (!option_no_hardlinks) {
 344                         if (!link(src->buf, dest->buf))
 345                                 continue;
 346                         if (option_local > 0)
 347                                 die_errno(_("failed to create link '%s'"), dest->buf);
 348                         option_no_hardlinks = 1;
 349                 }
 350                 if (copy_file_with_time(dest->buf, src->buf, 0666))
 351                         die_errno(_("failed to copy file to '%s'"), dest->buf);
 352         }
 353         closedir(dir);
 354 }
 355
 356 static void clone_local(const char *src_repo, const char *dest_repo)
 357 {
 358         if (option_shared) {
 359                 struct strbuf alt = STRBUF_INIT;
 360                 strbuf_addf(&alt, "%s/objects", src_repo);
 361                 add_to_alternates_file(alt.buf);
 362                 strbuf_release(&alt);
 363         } else {
 364                 struct strbuf src = STRBUF_INIT;
 365                 struct strbuf dest = STRBUF_INIT;
 366                 strbuf_addf(&src, "%s/objects", src_repo);
 367                 strbuf_addf(&dest, "%s/objects", dest_repo);
 368                 copy_or_link_directory(&src, &dest, src_repo, src.len);
 369                 strbuf_release(&src);
 370                 strbuf_release(&dest);
 371         }
 372
 373         if (0 <= option_verbosity)
 374                 printf(_("done.\n"));
 375 }
 376
 377 static const char *junk_work_tree;
 378 static const char *junk_git_dir;
 379 static pid_t junk_pid;
 380 enum {
 381         JUNK_LEAVE_NONE,
 382         JUNK_LEAVE_REPO,
 383         JUNK_LEAVE_ALL
 384 } junk_mode = JUNK_LEAVE_NONE;
 385
 386 static const char junk_leave_repo_msg[] =
 387 N_("Clone succeeded, but checkout failed.\n"
 388    "You can inspect what was checked out with 'git status'\n"
 389    "and retry the checkout with 'git checkout -f HEAD'\n");
 390
 391 static void remove_junk(void)
 392 {
 393         struct strbuf sb = STRBUF_INIT;
 394
 395         switch (junk_mode) {
 396         case JUNK_LEAVE_REPO:
 397                 warning("%s", _(junk_leave_repo_msg));
 398                 /* fall-through */
 399         case JUNK_LEAVE_ALL:
 400                 return;
 401         default:
 402                 /* proceed to removal */
 403                 break;
 404         }
 405
 406         if (getpid() != junk_pid)
 407                 return;
 408         if (junk_git_dir) {
 409                 strbuf_addstr(&sb, junk_git_dir);
 410                 remove_dir_recursively(&sb, 0);
 411                 strbuf_reset(&sb);
 412         }
 413         if (junk_work_tree) {
 414                 strbuf_addstr(&sb, junk_work_tree);
 415                 remove_dir_recursively(&sb, 0);
 416                 strbuf_reset(&sb);
 417         }
 418 }
 419
 420 static void remove_junk_on_signal(int signo)
 421 {
 422         remove_junk();
 423         sigchain_pop(signo);
 424         raise(signo);
 425 }
 426
 427 static struct ref *find_remote_branch(const struct ref *refs, const char *branch)
 428 {
 429         struct ref *ref;
 430         struct strbuf head = STRBUF_INIT;
 431         strbuf_addstr(&head, "refs/heads/");
 432         strbuf_addstr(&head, branch);
 433         ref = find_ref_by_name(refs, head.buf);
 434         strbuf_release(&head);
 435
 436         if (ref)
 437                 return ref;
 438
 439         strbuf_addstr(&head, "refs/tags/");
 440         strbuf_addstr(&head, branch);
 441         ref = find_ref_by_name(refs, head.buf);
 442         strbuf_release(&head);
 443
 444         return ref;
 445 }
 446
 447 static struct ref *wanted_peer_refs(const struct ref *refs,
 448                 struct refspec *refspec)
 449 {
 450         struct ref *head = copy_ref(find_ref_by_name(refs, "HEAD"));
 451         struct ref *local_refs = head;
 452         struct ref **tail = head ? &head->next : &local_refs;
 453
 454         if (option_single_branch) {
 455                 struct ref *remote_head = NULL;
 456
 457                 if (!option_branch)
 458                         remote_head = guess_remote_head(head, refs, 0);
 459                 else {
 460                         local_refs = NULL;
 461                         tail = &local_refs;
 462                         remote_head = copy_ref(find_remote_branch(refs, option_branch));
 463                 }
 464
 465                 if (!remote_head && option_branch)
 466                         warning(_("Could not find remote branch %s to clone."),
 467                                 option_branch);
 468                 else {
 469                         get_fetch_map(remote_head, refspec, &tail, 0);
 470
 471                         /* if --branch=tag, pull the requested tag explicitly */
 472                         get_fetch_map(remote_head, tag_refspec, &tail, 0);
 473                 }
 474         } else
 475                 get_fetch_map(refs, refspec, &tail, 0);
 476
 477         if (!option_mirror && !option_single_branch)
 478                 get_fetch_map(refs, tag_refspec, &tail, 0);
 479
 480         return local_refs;
 481 }
 482
 483 static void write_remote_refs(const struct ref *local_refs)
 484 {
 485         const struct ref *r;
 486
 487         for (r = local_refs; r; r = r->next) {
 488                 if (!r->peer_ref)
 489                         continue;
 490                 add_packed_ref(r->peer_ref->name, r->old_sha1);
 491         }
 492
 493         pack_refs(PACK_REFS_ALL);
 494 }
 495
 496 static void write_followtags(const struct ref *refs, const char *msg)
 497 {
 498         const struct ref *ref;
 499         for (ref = refs; ref; ref = ref->next) {
 500                 if (prefixcmp(ref->name, "refs/tags/"))
 501                         continue;
 502                 if (!suffixcmp(ref->name, "^{}"))
 503                         continue;
 504                 if (!has_sha1_file(ref->old_sha1))
 505                         continue;
 506                 update_ref(msg, ref->name, ref->old_sha1,
 507                            NULL, 0, DIE_ON_ERR);
 508         }
 509 }
 510
 511 static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
 512 {
 513         struct ref **rm = cb_data;
 514         struct ref *ref = *rm;
 515
 516         /*
 517          * Skip anything missing a peer_ref, which we are not
 518          * actually going to write a ref for.
 519          */
 520         while (ref && !ref->peer_ref)
 521                 ref = ref->next;
 522         /* Returning -1 notes "end of list" to the caller. */
 523         if (!ref)
 524                 return -1;
 525
 526         hashcpy(sha1, ref->old_sha1);
 527         *rm = ref->next;
 528         return 0;
 529 }
 530
 531 static void update_remote_refs(const struct ref *refs,
 532                                const struct ref *mapped_refs,
 533                                const struct ref *remote_head_points_at,
 534                                const char *branch_top,
 535                                const char *msg)
 536 {
 537         const struct ref *rm = mapped_refs;
 538
 539         if (check_everything_connected(iterate_ref_map, 0, &rm))
 540                 die(_("remote did not send all necessary objects"));
 541
 542         if (refs) {
 543                 write_remote_refs(mapped_refs);
 544                 if (option_single_branch)
 545                         write_followtags(refs, msg);
 546         }
 547
 548         if (remote_head_points_at && !option_bare) {
 549                 struct strbuf head_ref = STRBUF_INIT;
 550                 strbuf_addstr(&head_ref, branch_top);
 551                 strbuf_addstr(&head_ref, "HEAD");
 552                 create_symref(head_ref.buf,
 553                               remote_head_points_at->peer_ref->name,
 554                               msg);
 555         }
 556 }
 557
 558 static void update_head(const struct ref *our, const struct ref *remote,
 559                         const char *msg)
 560 {
 561         if (our && !prefixcmp(our->name, "refs/heads/")) {
 562                 /* Local default branch link */
 563                 create_symref("HEAD", our->name, NULL);
 564                 if (!option_bare) {
 565                         const char *head = skip_prefix(our->name, "refs/heads/");
 566                         update_ref(msg, "HEAD", our->old_sha1, NULL, 0, DIE_ON_ERR);
 567                         install_branch_config(0, head, option_origin, our->name);
 568                 }
 569         } else if (our) {
 570                 struct commit *c = lookup_commit_reference(our->old_sha1);
 571                 /* --branch specifies a non-branch (i.e. tags), detach HEAD */
 572                 update_ref(msg, "HEAD", c->object.sha1,
 573                            NULL, REF_NODEREF, DIE_ON_ERR);
 574         } else if (remote) {
 575                 /*
 576                  * We know remote HEAD points to a non-branch, or
 577                  * HEAD points to a branch but we don't know which one.
 578                  * Detach HEAD in all these cases.
 579                  */
 580                 update_ref(msg, "HEAD", remote->old_sha1,
 581                            NULL, REF_NODEREF, DIE_ON_ERR);
 582         }
 583 }
 584
 585 static int checkout(void)
 586 {
 587         unsigned char sha1[20];
 588         char *head;
 589         struct lock_file *lock_file;
 590         struct unpack_trees_options opts;
 591         struct tree *tree;
 592         struct tree_desc t;
 593         int err = 0, fd;
 594
 595         if (option_no_checkout)
 596                 return 0;
 597
 598         head = resolve_refdup("HEAD", sha1, 1, NULL);
 599         if (!head) {
 600                 warning(_("remote HEAD refers to nonexistent ref, "
 601                           "unable to checkout.\n"));
 602                 return 0;
 603         }
 604         if (!strcmp(head, "HEAD")) {
 605                 if (advice_detached_head)
 606                         detach_advice(sha1_to_hex(sha1));
 607         } else {
 608                 if (prefixcmp(head, "refs/heads/"))
 609                         die(_("HEAD not found below refs/heads!"));
 610         }
 611         free(head);
 612
 613         /* We need to be in the new work tree for the checkout */
 614         setup_work_tree();
 615
 616         lock_file = xcalloc(1, sizeof(struct lock_file));
 617         fd = hold_locked_index(lock_file, 1);
 618
 619         memset(&opts, 0, sizeof opts);
 620         opts.update = 1;
 621         opts.merge = 1;
 622         opts.fn = oneway_merge;
 623         opts.verbose_update = (option_verbosity >= 0);
 624         opts.src_index = &the_index;
 625         opts.dst_index = &the_index;
 626
 627         tree = parse_tree_indirect(sha1);
 628         parse_tree(tree);
 629         init_tree_desc(&t, tree->buffer, tree->size);
 630         if (unpack_trees(1, &t, &opts) < 0)
 631                 die(_("unable to checkout working tree"));
 632
 633         if (write_cache(fd, active_cache, active_nr) ||
 634             commit_locked_index(lock_file))
 635                 die(_("unable to write new index file"));
 636
 637         err |= run_hook(NULL, "post-checkout", sha1_to_hex(null_sha1),
 638                         sha1_to_hex(sha1), "1", NULL);
 639
 640         if (!err && option_recursive)
 641                 err = run_command_v_opt(argv_submodule, RUN_GIT_CMD);
 642
 643         return err;
 644 }
 645
 646 static int write_one_config(const char *key, const char *value, void *data)
 647 {
 648         return git_config_set_multivar(key, value ? value : "true", "^$", 0);
 649 }
 650
 651 static void write_config(struct string_list *config)
 652 {
 653         int i;
 654
 655         for (i = 0; i < config->nr; i++) {
 656                 if (git_config_parse_parameter(config->items[i].string,
 657                                                write_one_config, NULL) < 0)
 658                         die("unable to write parameters to config file");
 659         }
 660 }
 661
 662 static void write_refspec_config(const char* src_ref_prefix,
 663                 const struct ref* our_head_points_at,
 664                 const struct ref* remote_head_points_at, struct strbuf* branch_top)
 665 {
 666         struct strbuf key = STRBUF_INIT;
 667         struct strbuf value = STRBUF_INIT;
 668
 669         if (option_mirror || !option_bare) {
 670                 if (option_single_branch && !option_mirror) {
 671                         if (option_branch) {
 672                                 if (strstr(our_head_points_at->name, "refs/tags/"))
 673                                         strbuf_addf(&value, "+%s:%s", our_head_points_at->name,
 674                                                 our_head_points_at->name);
 675                                 else
 676                                         strbuf_addf(&value, "+%s:%s%s", our_head_points_at->name,
 677                                                 branch_top->buf, option_branch);
 678                         } else if (remote_head_points_at) {
 679                                 strbuf_addf(&value, "+%s:%s%s", remote_head_points_at->name,
 680                                                 branch_top->buf,
 681                                                 skip_prefix(remote_head_points_at->name, "refs/heads/"));
 682                         }
 683                         /*
 684                          * otherwise, the next "git fetch" will
 685                          * simply fetch from HEAD without updating
 686                          * any remote tracking branch, which is what
 687                          * we want.
 688                          */
 689                 } else {
 690                         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top->buf);
 691                 }
 692                 /* Configure the remote */
 693                 if (value.len) {
 694                         strbuf_addf(&key, "remote.%s.fetch", option_origin);
 695                         git_config_set_multivar(key.buf, value.buf, "^$", 0);
 696                         strbuf_reset(&key);
 697
 698                         if (option_mirror) {
 699                                 strbuf_addf(&key, "remote.%s.mirror", option_origin);
 700                                 git_config_set(key.buf, "true");
 701                                 strbuf_reset(&key);
 702                         }
 703                 }
 704         }
 705
 706         strbuf_release(&key);
 707         strbuf_release(&value);
 708 }
 709
 710 int cmd_clone(int argc, const char **argv, const char *prefix)
 711 {
 712         int is_bundle = 0, is_local;
 713         struct stat buf;
 714         const char *repo_name, *repo, *work_tree, *git_dir;
 715         char *path, *dir;
 716         int dest_exists;
 717         const struct ref *refs, *remote_head;
 718         const struct ref *remote_head_points_at;
 719         const struct ref *our_head_points_at;
 720         struct ref *mapped_refs;
 721         const struct ref *ref;
 722         struct strbuf key = STRBUF_INIT, value = STRBUF_INIT;
 723         struct strbuf branch_top = STRBUF_INIT, reflog_msg = STRBUF_INIT;
 724         struct transport *transport = NULL;
 725         const char *src_ref_prefix = "refs/heads/";
 726         struct remote *remote;
 727         int err = 0, complete_refs_before_fetch = 1;
 728
 729         struct refspec *refspec;
 730         const char *fetch_pattern;
 731
 732         junk_pid = getpid();
 733
 734         packet_trace_identity("clone");
 735         argc = parse_options(argc, argv, prefix, builtin_clone_options,
 736                              builtin_clone_usage, 0);
 737
 738         if (argc > 2)
 739                 usage_msg_opt(_("Too many arguments."),
 740                         builtin_clone_usage, builtin_clone_options);
 741
 742         if (argc == 0)
 743                 usage_msg_opt(_("You must specify a repository to clone."),
 744                         builtin_clone_usage, builtin_clone_options);
 745
 746         if (option_single_branch == -1)
 747                 option_single_branch = option_depth ? 1 : 0;
 748
 749         if (option_mirror)
 750                 option_bare = 1;
 751
 752         if (option_bare) {
 753                 if (option_origin)
 754                         die(_("--bare and --origin %s options are incompatible."),
 755                             option_origin);
 756                 if (real_git_dir)
 757                         die(_("--bare and --separate-git-dir are incompatible."));
 758                 option_no_checkout = 1;
 759         }
 760
 761         if (!option_origin)
 762                 option_origin = "origin";
 763
 764         repo_name = argv[0];
 765
 766         path = get_repo_path(repo_name, &is_bundle);
 767         if (path)
 768                 repo = xstrdup(absolute_path(repo_name));
 769         else if (!strchr(repo_name, ':'))
 770                 die(_("repository '%s' does not exist"), repo_name);
 771         else
 772                 repo = repo_name;
 773         is_local = option_local != 0 && path && !is_bundle;
 774         if (is_local && option_depth)
 775                 warning(_("--depth is ignored in local clones; use file:// instead."));
 776
 777         if (argc == 2)
 778                 dir = xstrdup(argv[1]);
 779         else
 780                 dir = guess_dir_name(repo_name, is_bundle, option_bare);
 781         strip_trailing_slashes(dir);
 782
 783         dest_exists = !stat(dir, &buf);
 784         if (dest_exists && !is_empty_dir(dir))
 785                 die(_("destination path '%s' already exists and is not "
 786                         "an empty directory."), dir);
 787
 788         strbuf_addf(&reflog_msg, "clone: from %s", repo);
 789
 790         if (option_bare)
 791                 work_tree = NULL;
 792         else {
 793                 work_tree = getenv("GIT_WORK_TREE");
 794                 if (work_tree && !stat(work_tree, &buf))
 795                         die(_("working tree '%s' already exists."), work_tree);
 796         }
 797
 798         if (option_bare || work_tree)
 799                 git_dir = xstrdup(dir);
 800         else {
 801                 work_tree = dir;
 802                 git_dir = mkpathdup("%s/.git", dir);
 803         }
 804
 805         if (!option_bare) {
 806                 junk_work_tree = work_tree;
 807                 if (safe_create_leading_directories_const(work_tree) < 0)
 808                         die_errno(_("could not create leading directories of '%s'"),
 809                                   work_tree);
 810                 if (!dest_exists && mkdir(work_tree, 0777))
 811                         die_errno(_("could not create work tree dir '%s'."),
 812                                   work_tree);
 813                 set_git_work_tree(work_tree);
 814         }
 815         junk_git_dir = git_dir;
 816         atexit(remove_junk);
 817         sigchain_push_common(remove_junk_on_signal);
 818
 819         if (safe_create_leading_directories_const(git_dir) < 0)
 820                 die(_("could not create leading directories of '%s'"), git_dir);
 821
 822         set_git_dir_init(git_dir, real_git_dir, 0);
 823         if (real_git_dir) {
 824                 git_dir = real_git_dir;
 825                 junk_git_dir = real_git_dir;
 826         }
 827
 828         if (0 <= option_verbosity) {
 829                 if (option_bare)
 830                         printf(_("Cloning into bare repository '%s'...\n"), dir);
 831                 else
 832                         printf(_("Cloning into '%s'...\n"), dir);
 833         }
 834         init_db(option_template, INIT_DB_QUIET);
 835         write_config(&option_config);
 836
 837         git_config(git_default_config, NULL);
 838
 839         if (option_bare) {
 840                 if (option_mirror)
 841                         src_ref_prefix = "refs/";
 842                 strbuf_addstr(&branch_top, src_ref_prefix);
 843
 844                 git_config_set("core.bare", "true");
 845         } else {
 846                 strbuf_addf(&branch_top, "refs/remotes/%s/", option_origin);
 847         }
 848
 849         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top.buf);
 850         strbuf_addf(&key, "remote.%s.url", option_origin);
 851         git_config_set(key.buf, repo);
 852         strbuf_reset(&key);
 853
 854         if (option_reference.nr)
 855                 setup_reference();
 856
 857         fetch_pattern = value.buf;
 858         refspec = parse_fetch_refspec(1, &fetch_pattern);
 859
 860         strbuf_reset(&value);
 861
 862         remote = remote_get(option_origin);
 863         transport = transport_get(remote, remote->url[0]);
 864
 865         if (!is_local) {
 866                 if (!transport->get_refs_list || !transport->fetch)
 867                         die(_("Don't know how to clone %s"), transport->url);
 868
 869                 transport_set_option(transport, TRANS_OPT_KEEP, "yes");
 870
 871                 if (option_depth)
 872                         transport_set_option(transport, TRANS_OPT_DEPTH,
 873                                              option_depth);
 874                 if (option_single_branch)
 875                         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
 876
 877                 transport_set_verbosity(transport, option_verbosity, option_progress);
 878
 879                 if (option_upload_pack)
 880                         transport_set_option(transport, TRANS_OPT_UPLOADPACK,
 881                                              option_upload_pack);
 882         }
 883
 884         refs = transport_get_remote_refs(transport);
 885
 886         if (refs) {
 887                 mapped_refs = wanted_peer_refs(refs, refspec);
 888                 /*
 889                  * transport_get_remote_refs() may return refs with null sha-1
 890                  * in mapped_refs (see struct transport->get_refs_list
 891                  * comment). In that case we need fetch it early because
 892                  * remote_head code below relies on it.
 893                  *
 894                  * for normal clones, transport_get_remote_refs() should
 895                  * return reliable ref set, we can delay cloning until after
 896                  * remote HEAD check.
 897                  */
 898                 for (ref = refs; ref; ref = ref->next)
 899                         if (is_null_sha1(ref->old_sha1)) {
 900                                 complete_refs_before_fetch = 0;
 901                                 break;
 902                         }
 903
 904                 if (!is_local && !complete_refs_before_fetch)
 905                         transport_fetch_refs(transport, mapped_refs);
 906
 907                 remote_head = find_ref_by_name(refs, "HEAD");
 908                 remote_head_points_at =
 909                         guess_remote_head(remote_head, mapped_refs, 0);
 910
 911                 if (option_branch) {
 912                         our_head_points_at =
 913                                 find_remote_branch(mapped_refs, option_branch);
 914
 915                         if (!our_head_points_at)
 916                                 die(_("Remote branch %s not found in upstream %s"),
 917                                     option_branch, option_origin);
 918                 }
 919                 else
 920                         our_head_points_at = remote_head_points_at;
 921         }
 922         else {
 923                 warning(_("You appear to have cloned an empty repository."));
 924                 mapped_refs = NULL;
 925                 our_head_points_at = NULL;
 926                 remote_head_points_at = NULL;
 927                 remote_head = NULL;
 928                 option_no_checkout = 1;
 929                 if (!option_bare)
 930                         install_branch_config(0, "master", option_origin,
 931                                               "refs/heads/master");
 932         }
 933
 934         write_refspec_config(src_ref_prefix, our_head_points_at,
 935                         remote_head_points_at, &branch_top);
 936
 937         if (is_local)
 938                 clone_local(path, git_dir);
 939         else if (refs && complete_refs_before_fetch)
 940                 transport_fetch_refs(transport, mapped_refs);
 941
 942         update_remote_refs(refs, mapped_refs, remote_head_points_at,
 943                            branch_top.buf, reflog_msg.buf);
 944
 945         update_head(our_head_points_at, remote_head, reflog_msg.buf);
 946
 947         transport_unlock_pack(transport);
 948         transport_disconnect(transport);
 949
 950         junk_mode = JUNK_LEAVE_REPO;
 951         err = checkout();
 952
 953         strbuf_release(&reflog_msg);
 954         strbuf_release(&branch_top);
 955         strbuf_release(&key);
 956         strbuf_release(&value);
 957         junk_mode = JUNK_LEAVE_ALL;
 958         return err;
 959 }