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
  23 /*
  24  * Overall FIXMEs:
  25  *  - respect DB_ENVIRONMENT for .git/objects.
  26  *
  27  * Implementation notes:
  28  *  - dropping use-separate-remote and no-separate-remote compatibility
  29  *
  30  */
  31 static const char * const builtin_clone_usage[] = {
  32         "git clone [options] [--] <repo> [<dir>]",
  33         NULL
  34 };
  35
  36 static int option_quiet, option_no_checkout, option_bare, option_mirror;
  37 static int option_local, option_no_hardlinks, option_shared;
  38 static char *option_template, *option_reference, *option_depth;
  39 static char *option_origin = NULL;
  40 static char *option_upload_pack = "git-upload-pack";
  41 static int option_verbose;
  42
  43 static struct option builtin_clone_options[] = {
  44         OPT__QUIET(&option_quiet),
  45         OPT__VERBOSE(&option_verbose),
  46         OPT_BOOLEAN('n', "no-checkout", &option_no_checkout,
  47                     "don't create a checkout"),
  48         OPT_BOOLEAN(0, "bare", &option_bare, "create a bare repository"),
  49         OPT_BOOLEAN(0, "naked", &option_bare, "create a bare repository"),
  50         OPT_BOOLEAN(0, "mirror", &option_mirror,
  51                     "create a mirror repository (implies bare)"),
  52         OPT_BOOLEAN('l', "local", &option_local,
  53                     "to clone from a local repository"),
  54         OPT_BOOLEAN(0, "no-hardlinks", &option_no_hardlinks,
  55                     "don't use local hardlinks, always copy"),
  56         OPT_BOOLEAN('s', "shared", &option_shared,
  57                     "setup as shared repository"),
  58         OPT_STRING(0, "template", &option_template, "path",
  59                    "path the template repository"),
  60         OPT_STRING(0, "reference", &option_reference, "repo",
  61                    "reference repository"),
  62         OPT_STRING('o', "origin", &option_origin, "branch",
  63                    "use <branch> instead of 'origin' to track upstream"),
  64         OPT_STRING('u', "upload-pack", &option_upload_pack, "path",
  65                    "path to git-upload-pack on the remote"),
  66         OPT_STRING(0, "depth", &option_depth, "depth",
  67                     "create a shallow clone of that depth"),
  68
  69         OPT_END()
  70 };
  71
  72 static char *get_repo_path(const char *repo, int *is_bundle)
  73 {
  74         static char *suffix[] = { "/.git", ".git", "" };
  75         static char *bundle_suffix[] = { ".bundle", "" };
  76         struct stat st;
  77         int i;
  78
  79         for (i = 0; i < ARRAY_SIZE(suffix); i++) {
  80                 const char *path;
  81                 path = mkpath("%s%s", repo, suffix[i]);
  82                 if (is_directory(path)) {
  83                         *is_bundle = 0;
  84                         return xstrdup(make_nonrelative_path(path));
  85                 }
  86         }
  87
  88         for (i = 0; i < ARRAY_SIZE(bundle_suffix); i++) {
  89                 const char *path;
  90                 path = mkpath("%s%s", repo, bundle_suffix[i]);
  91                 if (!stat(path, &st) && S_ISREG(st.st_mode)) {
  92                         *is_bundle = 1;
  93                         return xstrdup(make_nonrelative_path(path));
  94                 }
  95         }
  96
  97         return NULL;
  98 }
  99
 100 static char *guess_dir_name(const char *repo, int is_bundle, int is_bare)
 101 {
 102         const char *end = repo + strlen(repo), *start;
 103
 104         /*
 105          * Strip trailing slashes and /.git
 106          */
 107         while (repo < end && is_dir_sep(end[-1]))
 108                 end--;
 109         if (end - repo > 5 && is_dir_sep(end[-5]) &&
 110             !strncmp(end - 4, ".git", 4)) {
 111                 end -= 5;
 112                 while (repo < end && is_dir_sep(end[-1]))
 113                         end--;
 114         }
 115
 116         /*
 117          * Find last component, but be prepared that repo could have
 118          * the form  "remote.example.com:foo.git", i.e. no slash
 119          * in the directory part.
 120          */
 121         start = end;
 122         while (repo < start && !is_dir_sep(start[-1]) && start[-1] != ':')
 123                 start--;
 124
 125         /*
 126          * Strip .{bundle,git}.
 127          */
 128         if (is_bundle) {
 129                 if (end - start > 7 && !strncmp(end - 7, ".bundle", 7))
 130                         end -= 7;
 131         } else {
 132                 if (end - start > 4 && !strncmp(end - 4, ".git", 4))
 133                         end -= 4;
 134         }
 135
 136         if (is_bare) {
 137                 char *result = xmalloc(end - start + 5);
 138                 sprintf(result, "%.*s.git", (int)(end - start), start);
 139                 return result;
 140         }
 141
 142         return xstrndup(start, end - start);
 143 }
 144
 145 static void strip_trailing_slashes(char *dir)
 146 {
 147         char *end = dir + strlen(dir);
 148
 149         while (dir < end - 1 && is_dir_sep(end[-1]))
 150                 end--;
 151         *end = '\0';
 152 }
 153
 154 static void setup_reference(const char *repo)
 155 {
 156         const char *ref_git;
 157         char *ref_git_copy;
 158
 159         struct remote *remote;
 160         struct transport *transport;
 161         const struct ref *extra;
 162
 163         ref_git = make_absolute_path(option_reference);
 164
 165         if (is_directory(mkpath("%s/.git/objects", ref_git)))
 166                 ref_git = mkpath("%s/.git", ref_git);
 167         else if (!is_directory(mkpath("%s/objects", ref_git)))
 168                 die("reference repository '%s' is not a local directory.",
 169                     option_reference);
 170
 171         ref_git_copy = xstrdup(ref_git);
 172
 173         add_to_alternates_file(ref_git_copy);
 174
 175         remote = remote_get(ref_git_copy);
 176         transport = transport_get(remote, ref_git_copy);
 177         for (extra = transport_get_remote_refs(transport); extra;
 178              extra = extra->next)
 179                 add_extra_ref(extra->name, extra->old_sha1, 0);
 180
 181         transport_disconnect(transport);
 182
 183         free(ref_git_copy);
 184 }
 185
 186 static void copy_or_link_directory(char *src, char *dest)
 187 {
 188         struct dirent *de;
 189         struct stat buf;
 190         int src_len, dest_len;
 191         DIR *dir;
 192
 193         dir = opendir(src);
 194         if (!dir)
 195                 die("failed to open %s\n", src);
 196
 197         if (mkdir(dest, 0777)) {
 198                 if (errno != EEXIST)
 199                         die("failed to create directory %s\n", dest);
 200                 else if (stat(dest, &buf))
 201                         die("failed to stat %s\n", dest);
 202                 else if (!S_ISDIR(buf.st_mode))
 203                         die("%s exists and is not a directory\n", dest);
 204         }
 205
 206         src_len = strlen(src);
 207         src[src_len] = '/';
 208         dest_len = strlen(dest);
 209         dest[dest_len] = '/';
 210
 211         while ((de = readdir(dir)) != NULL) {
 212                 strcpy(src + src_len + 1, de->d_name);
 213                 strcpy(dest + dest_len + 1, de->d_name);
 214                 if (stat(src, &buf)) {
 215                         warning ("failed to stat %s\n", src);
 216                         continue;
 217                 }
 218                 if (S_ISDIR(buf.st_mode)) {
 219                         if (de->d_name[0] != '.')
 220                                 copy_or_link_directory(src, dest);
 221                         continue;
 222                 }
 223
 224                 if (unlink(dest) && errno != ENOENT)
 225                         die("failed to unlink %s\n", dest);
 226                 if (!option_no_hardlinks) {
 227                         if (!link(src, dest))
 228                                 continue;
 229                         if (option_local)
 230                                 die("failed to create link %s\n", dest);
 231                         option_no_hardlinks = 1;
 232                 }
 233                 if (copy_file(dest, src, 0666))
 234                         die("failed to copy file to %s\n", dest);
 235         }
 236         closedir(dir);
 237 }
 238
 239 static const struct ref *clone_local(const char *src_repo,
 240                                      const char *dest_repo)
 241 {
 242         const struct ref *ret;
 243         char src[PATH_MAX];
 244         char dest[PATH_MAX];
 245         struct remote *remote;
 246         struct transport *transport;
 247
 248         if (option_shared)
 249                 add_to_alternates_file(src_repo);
 250         else {
 251                 snprintf(src, PATH_MAX, "%s/objects", src_repo);
 252                 snprintf(dest, PATH_MAX, "%s/objects", dest_repo);
 253                 copy_or_link_directory(src, dest);
 254         }
 255
 256         remote = remote_get(src_repo);
 257         transport = transport_get(remote, src_repo);
 258         ret = transport_get_remote_refs(transport);
 259         transport_disconnect(transport);
 260         return ret;
 261 }
 262
 263 static const char *junk_work_tree;
 264 static const char *junk_git_dir;
 265 pid_t junk_pid;
 266
 267 static void remove_junk(void)
 268 {
 269         struct strbuf sb = STRBUF_INIT;
 270         if (getpid() != junk_pid)
 271                 return;
 272         if (junk_git_dir) {
 273                 strbuf_addstr(&sb, junk_git_dir);
 274                 remove_dir_recursively(&sb, 0);
 275                 strbuf_reset(&sb);
 276         }
 277         if (junk_work_tree) {
 278                 strbuf_addstr(&sb, junk_work_tree);
 279                 remove_dir_recursively(&sb, 0);
 280                 strbuf_reset(&sb);
 281         }
 282 }
 283
 284 static void remove_junk_on_signal(int signo)
 285 {
 286         remove_junk();
 287         signal(SIGINT, SIG_DFL);
 288         raise(signo);
 289 }
 290
 291 static const struct ref *locate_head(const struct ref *refs,
 292                                      const struct ref *mapped_refs,
 293                                      const struct ref **remote_head_p)
 294 {
 295         const struct ref *remote_head = NULL;
 296         const struct ref *remote_master = NULL;
 297         const struct ref *r;
 298         for (r = refs; r; r = r->next)
 299                 if (!strcmp(r->name, "HEAD"))
 300                         remote_head = r;
 301
 302         for (r = mapped_refs; r; r = r->next)
 303                 if (!strcmp(r->name, "refs/heads/master"))
 304                         remote_master = r;
 305
 306         if (remote_head_p)
 307                 *remote_head_p = remote_head;
 308
 309         /* If there's no HEAD value at all, never mind. */
 310         if (!remote_head)
 311                 return NULL;
 312
 313         /* If refs/heads/master could be right, it is. */
 314         if (remote_master && !hashcmp(remote_master->old_sha1,
 315                                       remote_head->old_sha1))
 316                 return remote_master;
 317
 318         /* Look for another ref that points there */
 319         for (r = mapped_refs; r; r = r->next)
 320                 if (r != remote_head &&
 321                     !hashcmp(r->old_sha1, remote_head->old_sha1))
 322                         return r;
 323
 324         /* Nothing is the same */
 325         return NULL;
 326 }
 327
 328 static struct ref *write_remote_refs(const struct ref *refs,
 329                 struct refspec *refspec, const char *reflog)
 330 {
 331         struct ref *local_refs = NULL;
 332         struct ref **tail = &local_refs;
 333         struct ref *r;
 334
 335         get_fetch_map(refs, refspec, &tail, 0);
 336         if (!option_mirror)
 337                 get_fetch_map(refs, tag_refspec, &tail, 0);
 338
 339         for (r = local_refs; r; r = r->next)
 340                 add_extra_ref(r->peer_ref->name, r->old_sha1, 0);
 341
 342         pack_refs(PACK_REFS_ALL);
 343         clear_extra_refs();
 344
 345         return local_refs;
 346 }
 347
 348 int cmd_clone(int argc, const char **argv, const char *prefix)
 349 {
 350         int use_local_hardlinks = 1;
 351         int use_separate_remote = 1;
 352         int is_bundle = 0;
 353         struct stat buf;
 354         const char *repo_name, *repo, *work_tree, *git_dir;
 355         char *path, *dir;
 356         const struct ref *refs, *head_points_at, *remote_head, *mapped_refs;
 357         char branch_top[256], key[256], value[256];
 358         struct strbuf reflog_msg = STRBUF_INIT;
 359         struct transport *transport = NULL;
 360         char *src_ref_prefix = "refs/heads/";
 361
 362         struct refspec refspec;
 363
 364         junk_pid = getpid();
 365
 366         argc = parse_options(argc, argv, builtin_clone_options,
 367                              builtin_clone_usage, 0);
 368
 369         if (argc == 0)
 370                 die("You must specify a repository to clone.");
 371
 372         if (option_no_hardlinks)
 373                 use_local_hardlinks = 0;
 374
 375         if (option_mirror)
 376                 option_bare = 1;
 377
 378         if (option_bare) {
 379                 if (option_origin)
 380                         die("--bare and --origin %s options are incompatible.",
 381                             option_origin);
 382                 option_no_checkout = 1;
 383                 use_separate_remote = 0;
 384         }
 385
 386         if (!option_origin)
 387                 option_origin = "origin";
 388
 389         repo_name = argv[0];
 390
 391         path = get_repo_path(repo_name, &is_bundle);
 392         if (path)
 393                 repo = xstrdup(make_nonrelative_path(repo_name));
 394         else if (!strchr(repo_name, ':'))
 395                 repo = xstrdup(make_absolute_path(repo_name));
 396         else
 397                 repo = repo_name;
 398
 399         if (argc == 2)
 400                 dir = xstrdup(argv[1]);
 401         else
 402                 dir = guess_dir_name(repo_name, is_bundle, option_bare);
 403         strip_trailing_slashes(dir);
 404
 405         if (!stat(dir, &buf))
 406                 die("destination directory '%s' already exists.", dir);
 407
 408         strbuf_addf(&reflog_msg, "clone: from %s", repo);
 409
 410         if (option_bare)
 411                 work_tree = NULL;
 412         else {
 413                 work_tree = getenv("GIT_WORK_TREE");
 414                 if (work_tree && !stat(work_tree, &buf))
 415                         die("working tree '%s' already exists.", work_tree);
 416         }
 417
 418         if (option_bare || work_tree)
 419                 git_dir = xstrdup(dir);
 420         else {
 421                 work_tree = dir;
 422                 git_dir = xstrdup(mkpath("%s/.git", dir));
 423         }
 424
 425         if (!option_bare) {
 426                 junk_work_tree = work_tree;
 427                 if (safe_create_leading_directories_const(work_tree) < 0)
 428                         die("could not create leading directories of '%s': %s",
 429                                         work_tree, strerror(errno));
 430                 if (mkdir(work_tree, 0755))
 431                         die("could not create work tree dir '%s': %s.",
 432                                         work_tree, strerror(errno));
 433                 set_git_work_tree(work_tree);
 434         }
 435         junk_git_dir = git_dir;
 436         atexit(remove_junk);
 437         signal(SIGINT, remove_junk_on_signal);
 438
 439         setenv(CONFIG_ENVIRONMENT, xstrdup(mkpath("%s/config", git_dir)), 1);
 440
 441         if (safe_create_leading_directories_const(git_dir) < 0)
 442                 die("could not create leading directories of '%s'", git_dir);
 443         set_git_dir(make_absolute_path(git_dir));
 444
 445         init_db(option_template, option_quiet ? INIT_DB_QUIET : 0);
 446
 447         /*
 448          * At this point, the config exists, so we do not need the
 449          * environment variable.  We actually need to unset it, too, to
 450          * re-enable parsing of the global configs.
 451          */
 452         unsetenv(CONFIG_ENVIRONMENT);
 453
 454         if (option_reference)
 455                 setup_reference(git_dir);
 456
 457         git_config(git_default_config, NULL);
 458
 459         if (option_bare) {
 460                 if (option_mirror)
 461                         src_ref_prefix = "refs/";
 462                 strcpy(branch_top, src_ref_prefix);
 463
 464                 git_config_set("core.bare", "true");
 465         } else {
 466                 snprintf(branch_top, sizeof(branch_top),
 467                          "refs/remotes/%s/", option_origin);
 468         }
 469
 470         if (option_mirror || !option_bare) {
 471                 /* Configure the remote */
 472                 if (option_mirror) {
 473                         snprintf(key, sizeof(key),
 474                                         "remote.%s.mirror", option_origin);
 475                         git_config_set(key, "true");
 476                 }
 477
 478                 snprintf(key, sizeof(key), "remote.%s.url", option_origin);
 479                 git_config_set(key, repo);
 480
 481                 snprintf(key, sizeof(key), "remote.%s.fetch", option_origin);
 482                 snprintf(value, sizeof(value),
 483                                 "+%s*:%s*", src_ref_prefix, branch_top);
 484                 git_config_set_multivar(key, value, "^$", 0);
 485         }
 486
 487         refspec.force = 0;
 488         refspec.pattern = 1;
 489         refspec.src = src_ref_prefix;
 490         refspec.dst = branch_top;
 491
 492         if (path && !is_bundle)
 493                 refs = clone_local(path, git_dir);
 494         else {
 495                 struct remote *remote = remote_get(argv[0]);
 496                 transport = transport_get(remote, remote->url[0]);
 497
 498                 if (!transport->get_refs_list || !transport->fetch)
 499                         die("Don't know how to clone %s", transport->url);
 500
 501                 transport_set_option(transport, TRANS_OPT_KEEP, "yes");
 502
 503                 if (option_depth)
 504                         transport_set_option(transport, TRANS_OPT_DEPTH,
 505                                              option_depth);
 506
 507                 if (option_quiet)
 508                         transport->verbose = -1;
 509                 else if (option_verbose)
 510                         transport->progress = 1;
 511
 512                 if (option_upload_pack)
 513                         transport_set_option(transport, TRANS_OPT_UPLOADPACK,
 514                                              option_upload_pack);
 515
 516                 refs = transport_get_remote_refs(transport);
 517                 transport_fetch_refs(transport, refs);
 518         }
 519
 520         clear_extra_refs();
 521
 522         mapped_refs = write_remote_refs(refs, &refspec, reflog_msg.buf);
 523
 524         head_points_at = locate_head(refs, mapped_refs, &remote_head);
 525
 526         if (head_points_at) {
 527                 /* Local default branch link */
 528                 create_symref("HEAD", head_points_at->name, NULL);
 529
 530                 if (!option_bare) {
 531                         struct strbuf head_ref = STRBUF_INIT;
 532                         const char *head = head_points_at->name;
 533
 534                         if (!prefixcmp(head, "refs/heads/"))
 535                                 head += 11;
 536
 537                         /* Set up the initial local branch */
 538
 539                         /* Local branch initial value */
 540                         update_ref(reflog_msg.buf, "HEAD",
 541                                    head_points_at->old_sha1,
 542                                    NULL, 0, DIE_ON_ERR);
 543
 544                         strbuf_addstr(&head_ref, branch_top);
 545                         strbuf_addstr(&head_ref, "HEAD");
 546
 547                         /* Remote branch link */
 548                         create_symref(head_ref.buf,
 549                                       head_points_at->peer_ref->name,
 550                                       reflog_msg.buf);
 551
 552                         snprintf(key, sizeof(key), "branch.%s.remote", head);
 553                         git_config_set(key, option_origin);
 554                         snprintf(key, sizeof(key), "branch.%s.merge", head);
 555                         git_config_set(key, head_points_at->name);
 556                 }
 557         } else if (remote_head) {
 558                 /* Source had detached HEAD pointing somewhere. */
 559                 if (!option_bare)
 560                         update_ref(reflog_msg.buf, "HEAD",
 561                                    remote_head->old_sha1,
 562                                    NULL, REF_NODEREF, DIE_ON_ERR);
 563         } else {
 564                 /* Nothing to checkout out */
 565                 if (!option_no_checkout)
 566                         warning("remote HEAD refers to nonexistent ref, "
 567                                 "unable to checkout.\n");
 568                 option_no_checkout = 1;
 569         }
 570
 571         if (transport)
 572                 transport_unlock_pack(transport);
 573
 574         if (!option_no_checkout) {
 575                 struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file));
 576                 struct unpack_trees_options opts;
 577                 struct tree *tree;
 578                 struct tree_desc t;
 579                 int fd;
 580
 581                 /* We need to be in the new work tree for the checkout */
 582                 setup_work_tree();
 583
 584                 fd = hold_locked_index(lock_file, 1);
 585
 586                 memset(&opts, 0, sizeof opts);
 587                 opts.update = 1;
 588                 opts.merge = 1;
 589                 opts.fn = oneway_merge;
 590                 opts.verbose_update = !option_quiet;
 591                 opts.src_index = &the_index;
 592                 opts.dst_index = &the_index;
 593
 594                 tree = parse_tree_indirect(remote_head->old_sha1);
 595                 parse_tree(tree);
 596                 init_tree_desc(&t, tree->buffer, tree->size);
 597                 unpack_trees(1, &t, &opts);
 598
 599                 if (write_cache(fd, active_cache, active_nr) ||
 600                     commit_locked_index(lock_file))
 601                         die("unable to write new index file");
 602         }
 603
 604         strbuf_release(&reflog_msg);
 605         junk_pid = 0;
 606         return 0;
 607 }