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 #include "branch.h"
  24 #include "remote.h"
  25 #include "run-command.h"
  26
  27 /*
  28  * Overall FIXMEs:
  29  *  - respect DB_ENVIRONMENT for .git/objects.
  30  *
  31  * Implementation notes:
  32  *  - dropping use-separate-remote and no-separate-remote compatibility
  33  *
  34  */
  35 static const char * const builtin_clone_usage[] = {
  36         "git clone [options] [--] <repo> [<dir>]",
  37         NULL
  38 };
  39
  40 static int option_quiet, option_no_checkout, option_bare, option_mirror;
  41 static int option_local, option_no_hardlinks, option_shared;
  42 static char *option_template, *option_reference, *option_depth;
  43 static char *option_origin = NULL;
  44 static char *option_upload_pack = "git-upload-pack";
  45 static int option_verbose;
  46
  47 static struct option builtin_clone_options[] = {
  48         OPT__QUIET(&option_quiet),
  49         OPT__VERBOSE(&option_verbose),
  50         OPT_BOOLEAN('n', "no-checkout", &option_no_checkout,
  51                     "don't create a checkout"),
  52         OPT_BOOLEAN(0, "bare", &option_bare, "create a bare repository"),
  53         OPT_BOOLEAN(0, "naked", &option_bare, "create a bare repository"),
  54         OPT_BOOLEAN(0, "mirror", &option_mirror,
  55                     "create a mirror repository (implies bare)"),
  56         OPT_BOOLEAN('l', "local", &option_local,
  57                     "to clone from a local repository"),
  58         OPT_BOOLEAN(0, "no-hardlinks", &option_no_hardlinks,
  59                     "don't use local hardlinks, always copy"),
  60         OPT_BOOLEAN('s', "shared", &option_shared,
  61                     "setup as shared repository"),
  62         OPT_STRING(0, "template", &option_template, "path",
  63                    "path the template repository"),
  64         OPT_STRING(0, "reference", &option_reference, "repo",
  65                    "reference repository"),
  66         OPT_STRING('o', "origin", &option_origin, "branch",
  67                    "use <branch> instead of 'origin' to track upstream"),
  68         OPT_STRING('u', "upload-pack", &option_upload_pack, "path",
  69                    "path to git-upload-pack on the remote"),
  70         OPT_STRING(0, "depth", &option_depth, "depth",
  71                     "create a shallow clone of that depth"),
  72
  73         OPT_END()
  74 };
  75
  76 static char *get_repo_path(const char *repo, int *is_bundle)
  77 {
  78         static char *suffix[] = { "/.git", ".git", "" };
  79         static char *bundle_suffix[] = { ".bundle", "" };
  80         struct stat st;
  81         int i;
  82
  83         for (i = 0; i < ARRAY_SIZE(suffix); i++) {
  84                 const char *path;
  85                 path = mkpath("%s%s", repo, suffix[i]);
  86                 if (is_directory(path)) {
  87                         *is_bundle = 0;
  88                         return xstrdup(make_nonrelative_path(path));
  89                 }
  90         }
  91
  92         for (i = 0; i < ARRAY_SIZE(bundle_suffix); i++) {
  93                 const char *path;
  94                 path = mkpath("%s%s", repo, bundle_suffix[i]);
  95                 if (!stat(path, &st) && S_ISREG(st.st_mode)) {
  96                         *is_bundle = 1;
  97                         return xstrdup(make_nonrelative_path(path));
  98                 }
  99         }
 100
 101         return NULL;
 102 }
 103
 104 static char *guess_dir_name(const char *repo, int is_bundle, int is_bare)
 105 {
 106         const char *end = repo + strlen(repo), *start;
 107         char *dir;
 108
 109         /*
 110          * Strip trailing spaces, slashes and /.git
 111          */
 112         while (repo < end && (is_dir_sep(end[-1]) || isspace(end[-1])))
 113                 end--;
 114         if (end - repo > 5 && is_dir_sep(end[-5]) &&
 115             !strncmp(end - 4, ".git", 4)) {
 116                 end -= 5;
 117                 while (repo < end && is_dir_sep(end[-1]))
 118                         end--;
 119         }
 120
 121         /*
 122          * Find last component, but be prepared that repo could have
 123          * the form  "remote.example.com:foo.git", i.e. no slash
 124          * in the directory part.
 125          */
 126         start = end;
 127         while (repo < start && !is_dir_sep(start[-1]) && start[-1] != ':')
 128                 start--;
 129
 130         /*
 131          * Strip .{bundle,git}.
 132          */
 133         if (is_bundle) {
 134                 if (end - start > 7 && !strncmp(end - 7, ".bundle", 7))
 135                         end -= 7;
 136         } else {
 137                 if (end - start > 4 && !strncmp(end - 4, ".git", 4))
 138                         end -= 4;
 139         }
 140
 141         if (is_bare) {
 142                 struct strbuf result = STRBUF_INIT;
 143                 strbuf_addf(&result, "%.*s.git", (int)(end - start), start);
 144                 dir = strbuf_detach(&result, NULL);
 145         } else
 146                 dir = xstrndup(start, end - start);
 147         /*
 148          * Replace sequences of 'control' characters and whitespace
 149          * with one ascii space, remove leading and trailing spaces.
 150          */
 151         if (*dir) {
 152                 char *out = dir;
 153                 int prev_space = 1 /* strip leading whitespace */;
 154                 for (end = dir; *end; ++end) {
 155                         char ch = *end;
 156                         if ((unsigned char)ch < '\x20')
 157                                 ch = '\x20';
 158                         if (isspace(ch)) {
 159                                 if (prev_space)
 160                                         continue;
 161                                 prev_space = 1;
 162                         } else
 163                                 prev_space = 0;
 164                         *out++ = ch;
 165                 }
 166                 *out = '\0';
 167                 if (out > dir && prev_space)
 168                         out[-1] = '\0';
 169         }
 170         return dir;
 171 }
 172
 173 static void strip_trailing_slashes(char *dir)
 174 {
 175         char *end = dir + strlen(dir);
 176
 177         while (dir < end - 1 && is_dir_sep(end[-1]))
 178                 end--;
 179         *end = '\0';
 180 }
 181
 182 static void setup_reference(const char *repo)
 183 {
 184         const char *ref_git;
 185         char *ref_git_copy;
 186
 187         struct remote *remote;
 188         struct transport *transport;
 189         const struct ref *extra;
 190
 191         ref_git = make_absolute_path(option_reference);
 192
 193         if (is_directory(mkpath("%s/.git/objects", ref_git)))
 194                 ref_git = mkpath("%s/.git", ref_git);
 195         else if (!is_directory(mkpath("%s/objects", ref_git)))
 196                 die("reference repository '%s' is not a local directory.",
 197                     option_reference);
 198
 199         ref_git_copy = xstrdup(ref_git);
 200
 201         add_to_alternates_file(ref_git_copy);
 202
 203         remote = remote_get(ref_git_copy);
 204         transport = transport_get(remote, ref_git_copy);
 205         for (extra = transport_get_remote_refs(transport); extra;
 206              extra = extra->next)
 207                 add_extra_ref(extra->name, extra->old_sha1, 0);
 208
 209         transport_disconnect(transport);
 210
 211         free(ref_git_copy);
 212 }
 213
 214 static void copy_or_link_directory(struct strbuf *src, struct strbuf *dest)
 215 {
 216         struct dirent *de;
 217         struct stat buf;
 218         int src_len, dest_len;
 219         DIR *dir;
 220
 221         dir = opendir(src->buf);
 222         if (!dir)
 223                 die_errno("failed to open '%s'", src->buf);
 224
 225         if (mkdir(dest->buf, 0777)) {
 226                 if (errno != EEXIST)
 227                         die_errno("failed to create directory '%s'", dest->buf);
 228                 else if (stat(dest->buf, &buf))
 229                         die_errno("failed to stat '%s'", dest->buf);
 230                 else if (!S_ISDIR(buf.st_mode))
 231                         die("%s exists and is not a directory", dest->buf);
 232         }
 233
 234         strbuf_addch(src, '/');
 235         src_len = src->len;
 236         strbuf_addch(dest, '/');
 237         dest_len = dest->len;
 238
 239         while ((de = readdir(dir)) != NULL) {
 240                 strbuf_setlen(src, src_len);
 241                 strbuf_addstr(src, de->d_name);
 242                 strbuf_setlen(dest, dest_len);
 243                 strbuf_addstr(dest, de->d_name);
 244                 if (stat(src->buf, &buf)) {
 245                         warning ("failed to stat %s\n", src->buf);
 246                         continue;
 247                 }
 248                 if (S_ISDIR(buf.st_mode)) {
 249                         if (de->d_name[0] != '.')
 250                                 copy_or_link_directory(src, dest);
 251                         continue;
 252                 }
 253
 254                 if (unlink(dest->buf) && errno != ENOENT)
 255                         die_errno("failed to unlink '%s'", dest->buf);
 256                 if (!option_no_hardlinks) {
 257                         if (!link(src->buf, dest->buf))
 258                                 continue;
 259                         if (option_local)
 260                                 die_errno("failed to create link '%s'", dest->buf);
 261                         option_no_hardlinks = 1;
 262                 }
 263                 if (copy_file(dest->buf, src->buf, 0666))
 264                         die_errno("failed to copy file to '%s'", dest->buf);
 265         }
 266         closedir(dir);
 267 }
 268
 269 static const struct ref *clone_local(const char *src_repo,
 270                                      const char *dest_repo)
 271 {
 272         const struct ref *ret;
 273         struct strbuf src = STRBUF_INIT;
 274         struct strbuf dest = STRBUF_INIT;
 275         struct remote *remote;
 276         struct transport *transport;
 277
 278         if (option_shared)
 279                 add_to_alternates_file(src_repo);
 280         else {
 281                 strbuf_addf(&src, "%s/objects", src_repo);
 282                 strbuf_addf(&dest, "%s/objects", dest_repo);
 283                 copy_or_link_directory(&src, &dest);
 284                 strbuf_release(&src);
 285                 strbuf_release(&dest);
 286         }
 287
 288         remote = remote_get(src_repo);
 289         transport = transport_get(remote, src_repo);
 290         ret = transport_get_remote_refs(transport);
 291         transport_disconnect(transport);
 292         return ret;
 293 }
 294
 295 static const char *junk_work_tree;
 296 static const char *junk_git_dir;
 297 static pid_t junk_pid;
 298
 299 static void remove_junk(void)
 300 {
 301         struct strbuf sb = STRBUF_INIT;
 302         if (getpid() != junk_pid)
 303                 return;
 304         if (junk_git_dir) {
 305                 strbuf_addstr(&sb, junk_git_dir);
 306                 remove_dir_recursively(&sb, 0);
 307                 strbuf_reset(&sb);
 308         }
 309         if (junk_work_tree) {
 310                 strbuf_addstr(&sb, junk_work_tree);
 311                 remove_dir_recursively(&sb, 0);
 312                 strbuf_reset(&sb);
 313         }
 314 }
 315
 316 static void remove_junk_on_signal(int signo)
 317 {
 318         remove_junk();
 319         sigchain_pop(signo);
 320         raise(signo);
 321 }
 322
 323 static struct ref *write_remote_refs(const struct ref *refs,
 324                 struct refspec *refspec, const char *reflog)
 325 {
 326         struct ref *local_refs = NULL;
 327         struct ref **tail = &local_refs;
 328         struct ref *r;
 329
 330         get_fetch_map(refs, refspec, &tail, 0);
 331         if (!option_mirror)
 332                 get_fetch_map(refs, tag_refspec, &tail, 0);
 333
 334         for (r = local_refs; r; r = r->next)
 335                 add_extra_ref(r->peer_ref->name, r->old_sha1, 0);
 336
 337         pack_refs(PACK_REFS_ALL);
 338         clear_extra_refs();
 339
 340         return local_refs;
 341 }
 342
 343 int cmd_clone(int argc, const char **argv, const char *prefix)
 344 {
 345         int is_bundle = 0;
 346         struct stat buf;
 347         const char *repo_name, *repo, *work_tree, *git_dir;
 348         char *path, *dir;
 349         int dest_exists;
 350         const struct ref *refs, *head_points_at, *remote_head, *mapped_refs;
 351         struct strbuf key = STRBUF_INIT, value = STRBUF_INIT;
 352         struct strbuf branch_top = STRBUF_INIT, reflog_msg = STRBUF_INIT;
 353         struct transport *transport = NULL;
 354         char *src_ref_prefix = "refs/heads/";
 355         int err = 0;
 356
 357         struct refspec *refspec;
 358         const char *fetch_pattern;
 359
 360         junk_pid = getpid();
 361
 362         argc = parse_options(argc, argv, prefix, builtin_clone_options,
 363                              builtin_clone_usage, 0);
 364
 365         if (argc == 0)
 366                 die("You must specify a repository to clone.");
 367
 368         if (option_mirror)
 369                 option_bare = 1;
 370
 371         if (option_bare) {
 372                 if (option_origin)
 373                         die("--bare and --origin %s options are incompatible.",
 374                             option_origin);
 375                 option_no_checkout = 1;
 376         }
 377
 378         if (!option_origin)
 379                 option_origin = "origin";
 380
 381         repo_name = argv[0];
 382
 383         path = get_repo_path(repo_name, &is_bundle);
 384         if (path)
 385                 repo = xstrdup(make_nonrelative_path(repo_name));
 386         else if (!strchr(repo_name, ':'))
 387                 repo = xstrdup(make_absolute_path(repo_name));
 388         else
 389                 repo = repo_name;
 390
 391         if (argc == 2)
 392                 dir = xstrdup(argv[1]);
 393         else
 394                 dir = guess_dir_name(repo_name, is_bundle, option_bare);
 395         strip_trailing_slashes(dir);
 396
 397         dest_exists = !stat(dir, &buf);
 398         if (dest_exists && !is_empty_dir(dir))
 399                 die("destination path '%s' already exists and is not "
 400                         "an empty directory.", dir);
 401
 402         strbuf_addf(&reflog_msg, "clone: from %s", repo);
 403
 404         if (option_bare)
 405                 work_tree = NULL;
 406         else {
 407                 work_tree = getenv("GIT_WORK_TREE");
 408                 if (work_tree && !stat(work_tree, &buf))
 409                         die("working tree '%s' already exists.", work_tree);
 410         }
 411
 412         if (option_bare || work_tree)
 413                 git_dir = xstrdup(dir);
 414         else {
 415                 work_tree = dir;
 416                 git_dir = xstrdup(mkpath("%s/.git", dir));
 417         }
 418
 419         if (!option_bare) {
 420                 junk_work_tree = work_tree;
 421                 if (safe_create_leading_directories_const(work_tree) < 0)
 422                         die_errno("could not create leading directories of '%s'",
 423                                   work_tree);
 424                 if (!dest_exists && mkdir(work_tree, 0755))
 425                         die_errno("could not create work tree dir '%s'.",
 426                                   work_tree);
 427                 set_git_work_tree(work_tree);
 428         }
 429         junk_git_dir = git_dir;
 430         atexit(remove_junk);
 431         sigchain_push_common(remove_junk_on_signal);
 432
 433         setenv(CONFIG_ENVIRONMENT, mkpath("%s/config", git_dir), 1);
 434
 435         if (safe_create_leading_directories_const(git_dir) < 0)
 436                 die("could not create leading directories of '%s'", git_dir);
 437         set_git_dir(make_absolute_path(git_dir));
 438
 439         init_db(option_template, option_quiet ? INIT_DB_QUIET : 0);
 440
 441         /*
 442          * At this point, the config exists, so we do not need the
 443          * environment variable.  We actually need to unset it, too, to
 444          * re-enable parsing of the global configs.
 445          */
 446         unsetenv(CONFIG_ENVIRONMENT);
 447
 448         if (option_reference)
 449                 setup_reference(git_dir);
 450
 451         git_config(git_default_config, NULL);
 452
 453         if (option_bare) {
 454                 if (option_mirror)
 455                         src_ref_prefix = "refs/";
 456                 strbuf_addstr(&branch_top, src_ref_prefix);
 457
 458                 git_config_set("core.bare", "true");
 459         } else {
 460                 strbuf_addf(&branch_top, "refs/remotes/%s/", option_origin);
 461         }
 462
 463         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top.buf);
 464
 465         if (option_mirror || !option_bare) {
 466                 /* Configure the remote */
 467                 strbuf_addf(&key, "remote.%s.fetch", option_origin);
 468                 git_config_set_multivar(key.buf, value.buf, "^$", 0);
 469                 strbuf_reset(&key);
 470
 471                 if (option_mirror) {
 472                         strbuf_addf(&key, "remote.%s.mirror", option_origin);
 473                         git_config_set(key.buf, "true");
 474                         strbuf_reset(&key);
 475                 }
 476
 477                 strbuf_addf(&key, "remote.%s.url", option_origin);
 478                 git_config_set(key.buf, repo);
 479                 strbuf_reset(&key);
 480         }
 481
 482         fetch_pattern = value.buf;
 483         refspec = parse_fetch_refspec(1, &fetch_pattern);
 484
 485         strbuf_reset(&value);
 486
 487         if (path && !is_bundle)
 488                 refs = clone_local(path, git_dir);
 489         else {
 490                 struct remote *remote = remote_get(argv[0]);
 491                 transport = transport_get(remote, remote->url[0]);
 492
 493                 if (!transport->get_refs_list || !transport->fetch)
 494                         die("Don't know how to clone %s", transport->url);
 495
 496                 transport_set_option(transport, TRANS_OPT_KEEP, "yes");
 497
 498                 if (option_depth)
 499                         transport_set_option(transport, TRANS_OPT_DEPTH,
 500                                              option_depth);
 501
 502                 if (option_quiet)
 503                         transport->verbose = -1;
 504                 else if (option_verbose)
 505                         transport->progress = 1;
 506
 507                 if (option_upload_pack)
 508                         transport_set_option(transport, TRANS_OPT_UPLOADPACK,
 509                                              option_upload_pack);
 510
 511                 refs = transport_get_remote_refs(transport);
 512                 if(refs)
 513                         transport_fetch_refs(transport, refs);
 514         }
 515
 516         if (refs) {
 517                 clear_extra_refs();
 518
 519                 mapped_refs = write_remote_refs(refs, refspec, reflog_msg.buf);
 520
 521                 remote_head = find_ref_by_name(refs, "HEAD");
 522                 head_points_at = guess_remote_head(remote_head, mapped_refs, 0);
 523         }
 524         else {
 525                 warning("You appear to have cloned an empty repository.");
 526                 head_points_at = NULL;
 527                 remote_head = NULL;
 528                 option_no_checkout = 1;
 529                 if (!option_bare)
 530                         install_branch_config(0, "master", option_origin,
 531                                               "refs/heads/master");
 532         }
 533
 534         if (head_points_at) {
 535                 /* Local default branch link */
 536                 create_symref("HEAD", head_points_at->name, NULL);
 537
 538                 if (!option_bare) {
 539                         struct strbuf head_ref = STRBUF_INIT;
 540                         const char *head = head_points_at->name;
 541
 542                         if (!prefixcmp(head, "refs/heads/"))
 543                                 head += 11;
 544
 545                         /* Set up the initial local branch */
 546
 547                         /* Local branch initial value */
 548                         update_ref(reflog_msg.buf, "HEAD",
 549                                    head_points_at->old_sha1,
 550                                    NULL, 0, DIE_ON_ERR);
 551
 552                         strbuf_addstr(&head_ref, branch_top.buf);
 553                         strbuf_addstr(&head_ref, "HEAD");
 554
 555                         /* Remote branch link */
 556                         create_symref(head_ref.buf,
 557                                       head_points_at->peer_ref->name,
 558                                       reflog_msg.buf);
 559
 560                         install_branch_config(0, head, option_origin,
 561                                               head_points_at->name);
 562                 }
 563         } else if (remote_head) {
 564                 /* Source had detached HEAD pointing somewhere. */
 565                 if (!option_bare)
 566                         update_ref(reflog_msg.buf, "HEAD",
 567                                    remote_head->old_sha1,
 568                                    NULL, REF_NODEREF, DIE_ON_ERR);
 569         } else {
 570                 /* Nothing to checkout out */
 571                 if (!option_no_checkout)
 572                         warning("remote HEAD refers to nonexistent ref, "
 573                                 "unable to checkout.\n");
 574                 option_no_checkout = 1;
 575         }
 576
 577         if (transport) {
 578                 transport_unlock_pack(transport);
 579                 transport_disconnect(transport);
 580         }
 581
 582         if (!option_no_checkout) {
 583                 struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file));
 584                 struct unpack_trees_options opts;
 585                 struct tree *tree;
 586                 struct tree_desc t;
 587                 int fd;
 588
 589                 /* We need to be in the new work tree for the checkout */
 590                 setup_work_tree();
 591
 592                 fd = hold_locked_index(lock_file, 1);
 593
 594                 memset(&opts, 0, sizeof opts);
 595                 opts.update = 1;
 596                 opts.merge = 1;
 597                 opts.fn = oneway_merge;
 598                 opts.verbose_update = !option_quiet;
 599                 opts.src_index = &the_index;
 600                 opts.dst_index = &the_index;
 601
 602                 tree = parse_tree_indirect(remote_head->old_sha1);
 603                 parse_tree(tree);
 604                 init_tree_desc(&t, tree->buffer, tree->size);
 605                 unpack_trees(1, &t, &opts);
 606
 607                 if (write_cache(fd, active_cache, active_nr) ||
 608                     commit_locked_index(lock_file))
 609                         die("unable to write new index file");
 610
 611                 err |= run_hook(NULL, "post-checkout", sha1_to_hex(null_sha1),
 612                                 sha1_to_hex(remote_head->old_sha1), "1", NULL);
 613         }
 614
 615         strbuf_release(&reflog_msg);
 616         strbuf_release(&branch_top);
 617         strbuf_release(&key);
 618         strbuf_release(&value);
 619         junk_pid = 0;
 620         return err;
 621 }