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