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 "cache.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
  24 /*
  25  * Overall FIXMEs:
  26  *  - respect DB_ENVIRONMENT for .git/objects.
  27  *
  28  * Implementation notes:
  29  *  - dropping use-separate-remote and no-separate-remote compatibility
  30  *
  31  */
  32 static const char * const builtin_clone_usage[] = {
  33         "git clone [options] [--] <repo> [<dir>]",
  34         NULL
  35 };
  36
  37 static int option_quiet, option_no_checkout, option_bare, option_mirror;
  38 static int option_local, option_no_hardlinks, option_shared;
  39 static char *option_template, *option_reference, *option_depth;
  40 static char *option_origin = NULL;
  41 static char *option_upload_pack = "git-upload-pack";
  42 static int option_verbose;
  43
  44 static struct option builtin_clone_options[] = {
  45         OPT__QUIET(&option_quiet),
  46         OPT__VERBOSE(&option_verbose),
  47         OPT_BOOLEAN('n', "no-checkout", &option_no_checkout,
  48                     "don't create a checkout"),
  49         OPT_BOOLEAN(0, "bare", &option_bare, "create a bare repository"),
  50         OPT_BOOLEAN(0, "naked", &option_bare, "create a bare repository"),
  51         OPT_BOOLEAN(0, "mirror", &option_mirror,
  52                     "create a mirror repository (implies bare)"),
  53         OPT_BOOLEAN('l', "local", &option_local,
  54                     "to clone from a local repository"),
  55         OPT_BOOLEAN(0, "no-hardlinks", &option_no_hardlinks,
  56                     "don't use local hardlinks, always copy"),
  57         OPT_BOOLEAN('s', "shared", &option_shared,
  58                     "setup as shared repository"),
  59         OPT_STRING(0, "template", &option_template, "path",
  60                    "path the template repository"),
  61         OPT_STRING(0, "reference", &option_reference, "repo",
  62                    "reference repository"),
  63         OPT_STRING('o', "origin", &option_origin, "branch",
  64                    "use <branch> instead of 'origin' to track upstream"),
  65         OPT_STRING('u', "upload-pack", &option_upload_pack, "path",
  66                    "path to git-upload-pack on the remote"),
  67         OPT_STRING(0, "depth", &option_depth, "depth",
  68                     "create a shallow clone of that depth"),
  69
  70         OPT_END()
  71 };
  72
  73 static char *get_repo_path(const char *repo, int *is_bundle)
  74 {
  75         static char *suffix[] = { "/.git", ".git", "" };
  76         static char *bundle_suffix[] = { ".bundle", "" };
  77         struct stat st;
  78         int i;
  79
  80         for (i = 0; i < ARRAY_SIZE(suffix); i++) {
  81                 const char *path;
  82                 path = mkpath("%s%s", repo, suffix[i]);
  83                 if (is_directory(path)) {
  84                         *is_bundle = 0;
  85                         return xstrdup(make_nonrelative_path(path));
  86                 }
  87         }
  88
  89         for (i = 0; i < ARRAY_SIZE(bundle_suffix); i++) {
  90                 const char *path;
  91                 path = mkpath("%s%s", repo, bundle_suffix[i]);
  92                 if (!stat(path, &st) && S_ISREG(st.st_mode)) {
  93                         *is_bundle = 1;
  94                         return xstrdup(make_nonrelative_path(path));
  95                 }
  96         }
  97
  98         return NULL;
  99 }
 100
 101 static char *guess_dir_name(const char *repo, int is_bundle, int is_bare)
 102 {
 103         const char *end = repo + strlen(repo), *start;
 104
 105         /*
 106          * Strip trailing slashes and /.git
 107          */
 108         while (repo < end && is_dir_sep(end[-1]))
 109                 end--;
 110         if (end - repo > 5 && is_dir_sep(end[-5]) &&
 111             !strncmp(end - 4, ".git", 4)) {
 112                 end -= 5;
 113                 while (repo < end && is_dir_sep(end[-1]))
 114                         end--;
 115         }
 116
 117         /*
 118          * Find last component, but be prepared that repo could have
 119          * the form  "remote.example.com:foo.git", i.e. no slash
 120          * in the directory part.
 121          */
 122         start = end;
 123         while (repo < start && !is_dir_sep(start[-1]) && start[-1] != ':')
 124                 start--;
 125
 126         /*
 127          * Strip .{bundle,git}.
 128          */
 129         if (is_bundle) {
 130                 if (end - start > 7 && !strncmp(end - 7, ".bundle", 7))
 131                         end -= 7;
 132         } else {
 133                 if (end - start > 4 && !strncmp(end - 4, ".git", 4))
 134                         end -= 4;
 135         }
 136
 137         if (is_bare) {
 138                 struct strbuf result = STRBUF_INIT;
 139                 strbuf_addf(&result, "%.*s.git", (int)(end - start), start);
 140                 return strbuf_detach(&result, 0);
 141         }
 142
 143         return xstrndup(start, end - start);
 144 }
 145
 146 static void strip_trailing_slashes(char *dir)
 147 {
 148         char *end = dir + strlen(dir);
 149
 150         while (dir < end - 1 && is_dir_sep(end[-1]))
 151                 end--;
 152         *end = '\0';
 153 }
 154
 155 static void setup_reference(const char *repo)
 156 {
 157         const char *ref_git;
 158         char *ref_git_copy;
 159
 160         struct remote *remote;
 161         struct transport *transport;
 162         const struct ref *extra;
 163
 164         ref_git = make_absolute_path(option_reference);
 165
 166         if (is_directory(mkpath("%s/.git/objects", ref_git)))
 167                 ref_git = mkpath("%s/.git", ref_git);
 168         else if (!is_directory(mkpath("%s/objects", ref_git)))
 169                 die("reference repository '%s' is not a local directory.",
 170                     option_reference);
 171
 172         ref_git_copy = xstrdup(ref_git);
 173
 174         add_to_alternates_file(ref_git_copy);
 175
 176         remote = remote_get(ref_git_copy);
 177         transport = transport_get(remote, ref_git_copy);
 178         for (extra = transport_get_remote_refs(transport); extra;
 179              extra = extra->next)
 180                 add_extra_ref(extra->name, extra->old_sha1, 0);
 181
 182         transport_disconnect(transport);
 183
 184         free(ref_git_copy);
 185 }
 186
 187 static void copy_or_link_directory(struct strbuf *src, struct strbuf *dest)
 188 {
 189         struct dirent *de;
 190         struct stat buf;
 191         int src_len, dest_len;
 192         DIR *dir;
 193
 194         dir = opendir(src->buf);
 195         if (!dir)
 196                 die("failed to open %s", src->buf);
 197
 198         if (mkdir(dest->buf, 0777)) {
 199                 if (errno != EEXIST)
 200                         die("failed to create directory %s", dest->buf);
 201                 else if (stat(dest->buf, &buf))
 202                         die("failed to stat %s", dest->buf);
 203                 else if (!S_ISDIR(buf.st_mode))
 204                         die("%s exists and is not a directory", dest->buf);
 205         }
 206
 207         strbuf_addch(src, '/');
 208         src_len = src->len;
 209         strbuf_addch(dest, '/');
 210         dest_len = dest->len;
 211
 212         while ((de = readdir(dir)) != NULL) {
 213                 strbuf_setlen(src, src_len);
 214                 strbuf_addstr(src, de->d_name);
 215                 strbuf_setlen(dest, dest_len);
 216                 strbuf_addstr(dest, de->d_name);
 217                 if (stat(src->buf, &buf)) {
 218                         warning ("failed to stat %s\n", src->buf);
 219                         continue;
 220                 }
 221                 if (S_ISDIR(buf.st_mode)) {
 222                         if (de->d_name[0] != '.')
 223                                 copy_or_link_directory(src, dest);
 224                         continue;
 225                 }
 226
 227                 if (unlink(dest->buf) && errno != ENOENT)
 228                         die("failed to unlink %s", dest->buf);
 229                 if (!option_no_hardlinks) {
 230                         if (!link(src->buf, dest->buf))
 231                                 continue;
 232                         if (option_local)
 233                                 die("failed to create link %s", dest->buf);
 234                         option_no_hardlinks = 1;
 235                 }
 236                 if (copy_file(dest->buf, src->buf, 0666))
 237                         die("failed to copy file to %s", dest->buf);
 238         }
 239         closedir(dir);
 240 }
 241
 242 static const struct ref *clone_local(const char *src_repo,
 243                                      const char *dest_repo)
 244 {
 245         const struct ref *ret;
 246         struct strbuf src = STRBUF_INIT;
 247         struct strbuf dest = STRBUF_INIT;
 248         struct remote *remote;
 249         struct transport *transport;
 250
 251         if (option_shared)
 252                 add_to_alternates_file(src_repo);
 253         else {
 254                 strbuf_addf(&src, "%s/objects", src_repo);
 255                 strbuf_addf(&dest, "%s/objects", dest_repo);
 256                 copy_or_link_directory(&src, &dest);
 257                 strbuf_release(&src);
 258                 strbuf_release(&dest);
 259         }
 260
 261         remote = remote_get(src_repo);
 262         transport = transport_get(remote, src_repo);
 263         ret = transport_get_remote_refs(transport);
 264         transport_disconnect(transport);
 265         return ret;
 266 }
 267
 268 static const char *junk_work_tree;
 269 static const char *junk_git_dir;
 270 pid_t junk_pid;
 271
 272 static void remove_junk(void)
 273 {
 274         struct strbuf sb = STRBUF_INIT;
 275         if (getpid() != junk_pid)
 276                 return;
 277         if (junk_git_dir) {
 278                 strbuf_addstr(&sb, junk_git_dir);
 279                 remove_dir_recursively(&sb, 0);
 280                 strbuf_reset(&sb);
 281         }
 282         if (junk_work_tree) {
 283                 strbuf_addstr(&sb, junk_work_tree);
 284                 remove_dir_recursively(&sb, 0);
 285                 strbuf_reset(&sb);
 286         }
 287 }
 288
 289 static void remove_junk_on_signal(int signo)
 290 {
 291         remove_junk();
 292         sigchain_pop(signo);
 293         raise(signo);
 294 }
 295
 296 static const struct ref *locate_head(const struct ref *refs,
 297                                      const struct ref *mapped_refs,
 298                                      const struct ref **remote_head_p)
 299 {
 300         const struct ref *remote_head = NULL;
 301         const struct ref *remote_master = NULL;
 302         const struct ref *r;
 303         for (r = refs; r; r = r->next)
 304                 if (!strcmp(r->name, "HEAD"))
 305                         remote_head = r;
 306
 307         for (r = mapped_refs; r; r = r->next)
 308                 if (!strcmp(r->name, "refs/heads/master"))
 309                         remote_master = r;
 310
 311         if (remote_head_p)
 312                 *remote_head_p = remote_head;
 313
 314         /* If there's no HEAD value at all, never mind. */
 315         if (!remote_head)
 316                 return NULL;
 317
 318         /* If refs/heads/master could be right, it is. */
 319         if (remote_master && !hashcmp(remote_master->old_sha1,
 320                                       remote_head->old_sha1))
 321                 return remote_master;
 322
 323         /* Look for another ref that points there */
 324         for (r = mapped_refs; r; r = r->next)
 325                 if (r != remote_head &&
 326                     !hashcmp(r->old_sha1, remote_head->old_sha1))
 327                         return r;
 328
 329         /* Nothing is the same */
 330         return NULL;
 331 }
 332
 333 static struct ref *write_remote_refs(const struct ref *refs,
 334                 struct refspec *refspec, const char *reflog)
 335 {
 336         struct ref *local_refs = NULL;
 337         struct ref **tail = &local_refs;
 338         struct ref *r;
 339
 340         get_fetch_map(refs, refspec, &tail, 0);
 341         if (!option_mirror)
 342                 get_fetch_map(refs, tag_refspec, &tail, 0);
 343
 344         for (r = local_refs; r; r = r->next)
 345                 add_extra_ref(r->peer_ref->name, r->old_sha1, 0);
 346
 347         pack_refs(PACK_REFS_ALL);
 348         clear_extra_refs();
 349
 350         return local_refs;
 351 }
 352
 353 int cmd_clone(int argc, const char **argv, const char *prefix)
 354 {
 355         int use_local_hardlinks = 1;
 356         int use_separate_remote = 1;
 357         int is_bundle = 0;
 358         struct stat buf;
 359         const char *repo_name, *repo, *work_tree, *git_dir;
 360         char *path, *dir;
 361         int dest_exists;
 362         const struct ref *refs, *head_points_at, *remote_head, *mapped_refs;
 363         struct strbuf key = STRBUF_INIT, value = STRBUF_INIT;
 364         struct strbuf branch_top = STRBUF_INIT, reflog_msg = STRBUF_INIT;
 365         struct transport *transport = NULL;
 366         char *src_ref_prefix = "refs/heads/";
 367
 368         struct refspec refspec;
 369
 370         junk_pid = getpid();
 371
 372         argc = parse_options(argc, argv, builtin_clone_options,
 373                              builtin_clone_usage, 0);
 374
 375         if (argc == 0)
 376                 die("You must specify a repository to clone.");
 377
 378         if (option_no_hardlinks)
 379                 use_local_hardlinks = 0;
 380
 381         if (option_mirror)
 382                 option_bare = 1;
 383
 384         if (option_bare) {
 385                 if (option_origin)
 386                         die("--bare and --origin %s options are incompatible.",
 387                             option_origin);
 388                 option_no_checkout = 1;
 389                 use_separate_remote = 0;
 390         }
 391
 392         if (!option_origin)
 393                 option_origin = "origin";
 394
 395         repo_name = argv[0];
 396
 397         path = get_repo_path(repo_name, &is_bundle);
 398         if (path)
 399                 repo = xstrdup(make_nonrelative_path(repo_name));
 400         else if (!strchr(repo_name, ':'))
 401                 repo = xstrdup(make_absolute_path(repo_name));
 402         else
 403                 repo = repo_name;
 404
 405         if (argc == 2)
 406                 dir = xstrdup(argv[1]);
 407         else
 408                 dir = guess_dir_name(repo_name, is_bundle, option_bare);
 409         strip_trailing_slashes(dir);
 410
 411         dest_exists = !stat(dir, &buf);
 412         if (dest_exists && !is_empty_dir(dir))
 413                 die("destination path '%s' already exists and is not "
 414                         "an empty directory.", dir);
 415
 416         strbuf_addf(&reflog_msg, "clone: from %s", repo);
 417
 418         if (option_bare)
 419                 work_tree = NULL;
 420         else {
 421                 work_tree = getenv("GIT_WORK_TREE");
 422                 if (work_tree && !stat(work_tree, &buf))
 423                         die("working tree '%s' already exists.", work_tree);
 424         }
 425
 426         if (option_bare || work_tree)
 427                 git_dir = xstrdup(dir);
 428         else {
 429                 work_tree = dir;
 430                 git_dir = xstrdup(mkpath("%s/.git", dir));
 431         }
 432
 433         if (!option_bare) {
 434                 junk_work_tree = work_tree;
 435                 if (safe_create_leading_directories_const(work_tree) < 0)
 436                         die("could not create leading directories of '%s': %s",
 437                                         work_tree, strerror(errno));
 438                 if (!dest_exists && mkdir(work_tree, 0755))
 439                         die("could not create work tree dir '%s': %s.",
 440                                         work_tree, strerror(errno));
 441                 set_git_work_tree(work_tree);
 442         }
 443         junk_git_dir = git_dir;
 444         atexit(remove_junk);
 445         sigchain_push_common(remove_junk_on_signal);
 446
 447         setenv(CONFIG_ENVIRONMENT, xstrdup(mkpath("%s/config", git_dir)), 1);
 448
 449         if (safe_create_leading_directories_const(git_dir) < 0)
 450                 die("could not create leading directories of '%s'", git_dir);
 451         set_git_dir(make_absolute_path(git_dir));
 452
 453         init_db(option_template, option_quiet ? INIT_DB_QUIET : 0);
 454
 455         /*
 456          * At this point, the config exists, so we do not need the
 457          * environment variable.  We actually need to unset it, too, to
 458          * re-enable parsing of the global configs.
 459          */
 460         unsetenv(CONFIG_ENVIRONMENT);
 461
 462         if (option_reference)
 463                 setup_reference(git_dir);
 464
 465         git_config(git_default_config, NULL);
 466
 467         if (option_bare) {
 468                 if (option_mirror)
 469                         src_ref_prefix = "refs/";
 470                 strbuf_addstr(&branch_top, src_ref_prefix);
 471
 472                 git_config_set("core.bare", "true");
 473         } else {
 474                 strbuf_addf(&branch_top, "refs/remotes/%s/", option_origin);
 475         }
 476
 477         if (option_mirror || !option_bare) {
 478                 /* Configure the remote */
 479                 if (option_mirror) {
 480                         strbuf_addf(&key, "remote.%s.mirror", option_origin);
 481                         git_config_set(key.buf, "true");
 482                         strbuf_reset(&key);
 483                 }
 484
 485                 strbuf_addf(&key, "remote.%s.url", option_origin);
 486                 git_config_set(key.buf, repo);
 487                         strbuf_reset(&key);
 488
 489                 strbuf_addf(&key, "remote.%s.fetch", option_origin);
 490                 strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top.buf);
 491                 git_config_set_multivar(key.buf, value.buf, "^$", 0);
 492                 strbuf_reset(&key);
 493                 strbuf_reset(&value);
 494         }
 495
 496         refspec.force = 0;
 497         refspec.pattern = 1;
 498         refspec.src = src_ref_prefix;
 499         refspec.dst = branch_top.buf;
 500
 501         if (path && !is_bundle)
 502                 refs = clone_local(path, git_dir);
 503         else {
 504                 struct remote *remote = remote_get(argv[0]);
 505                 transport = transport_get(remote, remote->url[0]);
 506
 507                 if (!transport->get_refs_list || !transport->fetch)
 508                         die("Don't know how to clone %s", transport->url);
 509
 510                 transport_set_option(transport, TRANS_OPT_KEEP, "yes");
 511
 512                 if (option_depth)
 513                         transport_set_option(transport, TRANS_OPT_DEPTH,
 514                                              option_depth);
 515
 516                 if (option_quiet)
 517                         transport->verbose = -1;
 518                 else if (option_verbose)
 519                         transport->progress = 1;
 520
 521                 if (option_upload_pack)
 522                         transport_set_option(transport, TRANS_OPT_UPLOADPACK,
 523                                              option_upload_pack);
 524
 525                 refs = transport_get_remote_refs(transport);
 526                 if(refs)
 527                         transport_fetch_refs(transport, refs);
 528         }
 529
 530         if (refs) {
 531                 clear_extra_refs();
 532
 533                 mapped_refs = write_remote_refs(refs, &refspec, reflog_msg.buf);
 534
 535                 head_points_at = locate_head(refs, mapped_refs, &remote_head);
 536         }
 537         else {
 538                 warning("You appear to have cloned an empty repository.");
 539                 head_points_at = NULL;
 540                 remote_head = NULL;
 541                 option_no_checkout = 1;
 542         }
 543
 544         if (head_points_at) {
 545                 /* Local default branch link */
 546                 create_symref("HEAD", head_points_at->name, NULL);
 547
 548                 if (!option_bare) {
 549                         struct strbuf head_ref = STRBUF_INIT;
 550                         const char *head = head_points_at->name;
 551
 552                         if (!prefixcmp(head, "refs/heads/"))
 553                                 head += 11;
 554
 555                         /* Set up the initial local branch */
 556
 557                         /* Local branch initial value */
 558                         update_ref(reflog_msg.buf, "HEAD",
 559                                    head_points_at->old_sha1,
 560                                    NULL, 0, DIE_ON_ERR);
 561
 562                         strbuf_addstr(&head_ref, branch_top.buf);
 563                         strbuf_addstr(&head_ref, "HEAD");
 564
 565                         /* Remote branch link */
 566                         create_symref(head_ref.buf,
 567                                       head_points_at->peer_ref->name,
 568                                       reflog_msg.buf);
 569
 570                         strbuf_addf(&key, "branch.%s.remote", head);
 571                         git_config_set(key.buf, option_origin);
 572                         strbuf_reset(&key);
 573                         strbuf_addf(&key, "branch.%s.merge", head);
 574                         git_config_set(key.buf, head_points_at->name);
 575                 }
 576         } else if (remote_head) {
 577                 /* Source had detached HEAD pointing somewhere. */
 578                 if (!option_bare)
 579                         update_ref(reflog_msg.buf, "HEAD",
 580                                    remote_head->old_sha1,
 581                                    NULL, REF_NODEREF, DIE_ON_ERR);
 582         } else {
 583                 /* Nothing to checkout out */
 584                 if (!option_no_checkout)
 585                         warning("remote HEAD refers to nonexistent ref, "
 586                                 "unable to checkout.\n");
 587                 option_no_checkout = 1;
 588         }
 589
 590         if (transport)
 591                 transport_unlock_pack(transport);
 592
 593         if (!option_no_checkout) {
 594                 struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file));
 595                 struct unpack_trees_options opts;
 596                 struct tree *tree;
 597                 struct tree_desc t;
 598                 int fd;
 599
 600                 /* We need to be in the new work tree for the checkout */
 601                 setup_work_tree();
 602
 603                 fd = hold_locked_index(lock_file, 1);
 604
 605                 memset(&opts, 0, sizeof opts);
 606                 opts.update = 1;
 607                 opts.merge = 1;
 608                 opts.fn = oneway_merge;
 609                 opts.verbose_update = !option_quiet;
 610                 opts.src_index = &the_index;
 611                 opts.dst_index = &the_index;
 612
 613                 tree = parse_tree_indirect(remote_head->old_sha1);
 614                 parse_tree(tree);
 615                 init_tree_desc(&t, tree->buffer, tree->size);
 616                 unpack_trees(1, &t, &opts);
 617
 618                 if (write_cache(fd, active_cache, active_nr) ||
 619                     commit_locked_index(lock_file))
 620                         die("unable to write new index file");
 621         }
 622
 623         strbuf_release(&reflog_msg);
 624         strbuf_release(&branch_top);
 625         strbuf_release(&key);
 626         strbuf_release(&value);
 627         junk_pid = 0;
 628         return 0;
 629 }