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, int is_bare)
  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         if (is_bare) {
 135                 char *result = xmalloc(end - start + 5);
 136                 sprintf(result, "%.*s.git", (int)(end - start), start);
 137                 return result;
 138         }
 139
 140         return xstrndup(start, end - start);
 141 }
 142
 143 static int is_directory(const char *path)
 144 {
 145         struct stat buf;
 146
 147         return !stat(path, &buf) && S_ISDIR(buf.st_mode);
 148 }
 149
 150 static void strip_trailing_slashes(char *dir)
 151 {
 152         char *end = dir + strlen(dir);
 153
 154         while (dir < end - 1 && is_dir_sep(end[-1]))
 155                 end--;
 156         *end = '\0';
 157 }
 158
 159 static void setup_reference(const char *repo)
 160 {
 161         const char *ref_git;
 162         char *ref_git_copy;
 163
 164         struct remote *remote;
 165         struct transport *transport;
 166         const struct ref *extra;
 167
 168         ref_git = make_absolute_path(option_reference);
 169
 170         if (is_directory(mkpath("%s/.git/objects", ref_git)))
 171                 ref_git = mkpath("%s/.git", ref_git);
 172         else if (!is_directory(mkpath("%s/objects", ref_git)))
 173                 die("reference repository '%s' is not a local directory.",
 174                     option_reference);
 175
 176         ref_git_copy = xstrdup(ref_git);
 177
 178         add_to_alternates_file(ref_git_copy);
 179
 180         remote = remote_get(ref_git_copy);
 181         transport = transport_get(remote, ref_git_copy);
 182         for (extra = transport_get_remote_refs(transport); extra;
 183              extra = extra->next)
 184                 add_extra_ref(extra->name, extra->old_sha1, 0);
 185
 186         transport_disconnect(transport);
 187
 188         free(ref_git_copy);
 189 }
 190
 191 static void copy_or_link_directory(char *src, char *dest)
 192 {
 193         struct dirent *de;
 194         struct stat buf;
 195         int src_len, dest_len;
 196         DIR *dir;
 197
 198         dir = opendir(src);
 199         if (!dir)
 200                 die("failed to open %s\n", src);
 201
 202         if (mkdir(dest, 0777)) {
 203                 if (errno != EEXIST)
 204                         die("failed to create directory %s\n", dest);
 205                 else if (stat(dest, &buf))
 206                         die("failed to stat %s\n", dest);
 207                 else if (!S_ISDIR(buf.st_mode))
 208                         die("%s exists and is not a directory\n", dest);
 209         }
 210
 211         src_len = strlen(src);
 212         src[src_len] = '/';
 213         dest_len = strlen(dest);
 214         dest[dest_len] = '/';
 215
 216         while ((de = readdir(dir)) != NULL) {
 217                 strcpy(src + src_len + 1, de->d_name);
 218                 strcpy(dest + dest_len + 1, de->d_name);
 219                 if (stat(src, &buf)) {
 220                         warning ("failed to stat %s\n", src);
 221                         continue;
 222                 }
 223                 if (S_ISDIR(buf.st_mode)) {
 224                         if (de->d_name[0] != '.')
 225                                 copy_or_link_directory(src, dest);
 226                         continue;
 227                 }
 228
 229                 if (unlink(dest) && errno != ENOENT)
 230                         die("failed to unlink %s\n", dest);
 231                 if (!option_no_hardlinks) {
 232                         if (!link(src, dest))
 233                                 continue;
 234                         if (option_local)
 235                                 die("failed to create link %s\n", dest);
 236                         option_no_hardlinks = 1;
 237                 }
 238                 if (copy_file(dest, src, 0666))
 239                         die("failed to copy file to %s\n", dest);
 240         }
 241         closedir(dir);
 242 }
 243
 244 static const struct ref *clone_local(const char *src_repo,
 245                                      const char *dest_repo)
 246 {
 247         const struct ref *ret;
 248         char src[PATH_MAX];
 249         char dest[PATH_MAX];
 250         struct remote *remote;
 251         struct transport *transport;
 252
 253         if (option_shared)
 254                 add_to_alternates_file(src_repo);
 255         else {
 256                 snprintf(src, PATH_MAX, "%s/objects", src_repo);
 257                 snprintf(dest, PATH_MAX, "%s/objects", dest_repo);
 258                 copy_or_link_directory(src, 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;
 275         if (getpid() != junk_pid)
 276                 return;
 277         strbuf_init(&sb, 0);
 278         if (junk_git_dir) {
 279                 strbuf_addstr(&sb, junk_git_dir);
 280                 remove_dir_recursively(&sb, 0);
 281                 strbuf_reset(&sb);
 282         }
 283         if (junk_work_tree) {
 284                 strbuf_addstr(&sb, junk_work_tree);
 285                 remove_dir_recursively(&sb, 0);
 286                 strbuf_reset(&sb);
 287         }
 288 }
 289
 290 static void remove_junk_on_signal(int signo)
 291 {
 292         remove_junk();
 293         signal(SIGINT, SIG_DFL);
 294         raise(signo);
 295 }
 296
 297 static const struct ref *locate_head(const struct ref *refs,
 298                                      const struct ref *mapped_refs,
 299                                      const struct ref **remote_head_p)
 300 {
 301         const struct ref *remote_head = NULL;
 302         const struct ref *remote_master = NULL;
 303         const struct ref *r;
 304         for (r = refs; r; r = r->next)
 305                 if (!strcmp(r->name, "HEAD"))
 306                         remote_head = r;
 307
 308         for (r = mapped_refs; r; r = r->next)
 309                 if (!strcmp(r->name, "refs/heads/master"))
 310                         remote_master = r;
 311
 312         if (remote_head_p)
 313                 *remote_head_p = remote_head;
 314
 315         /* If there's no HEAD value at all, never mind. */
 316         if (!remote_head)
 317                 return NULL;
 318
 319         /* If refs/heads/master could be right, it is. */
 320         if (remote_master && !hashcmp(remote_master->old_sha1,
 321                                       remote_head->old_sha1))
 322                 return remote_master;
 323
 324         /* Look for another ref that points there */
 325         for (r = mapped_refs; r; r = r->next)
 326                 if (r != remote_head &&
 327                     !hashcmp(r->old_sha1, remote_head->old_sha1))
 328                         return r;
 329
 330         /* Nothing is the same */
 331         return NULL;
 332 }
 333
 334 static struct ref *write_remote_refs(const struct ref *refs,
 335                 struct refspec *refspec, const char *reflog)
 336 {
 337         struct ref *local_refs = NULL;
 338         struct ref **tail = &local_refs;
 339         struct ref *r;
 340
 341         get_fetch_map(refs, refspec, &tail, 0);
 342         if (!option_mirror)
 343                 get_fetch_map(refs, tag_refspec, &tail, 0);
 344
 345         for (r = local_refs; r; r = r->next)
 346                 add_extra_ref(r->peer_ref->name, r->old_sha1, 0);
 347
 348         pack_refs(PACK_REFS_ALL);
 349         clear_extra_refs();
 350
 351         return local_refs;
 352 }
 353
 354 int cmd_clone(int argc, const char **argv, const char *prefix)
 355 {
 356         int use_local_hardlinks = 1;
 357         int use_separate_remote = 1;
 358         int is_bundle = 0;
 359         struct stat buf;
 360         const char *repo_name, *repo, *work_tree, *git_dir;
 361         char *path, *dir;
 362         const struct ref *refs, *head_points_at, *remote_head, *mapped_refs;
 363         char branch_top[256], key[256], value[256];
 364         struct strbuf reflog_msg;
 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         if (!stat(dir, &buf))
 412                 die("destination directory '%s' already exists.", dir);
 413
 414         strbuf_init(&reflog_msg, 0);
 415         strbuf_addf(&reflog_msg, "clone: from %s", repo);
 416
 417         if (option_bare)
 418                 work_tree = NULL;
 419         else {
 420                 work_tree = getenv("GIT_WORK_TREE");
 421                 if (work_tree && !stat(work_tree, &buf))
 422                         die("working tree '%s' already exists.", work_tree);
 423         }
 424
 425         if (option_bare || work_tree)
 426                 git_dir = xstrdup(dir);
 427         else {
 428                 work_tree = dir;
 429                 git_dir = xstrdup(mkpath("%s/.git", dir));
 430         }
 431
 432         if (!option_bare) {
 433                 junk_work_tree = work_tree;
 434                 if (safe_create_leading_directories_const(work_tree) < 0)
 435                         die("could not create leading directories of '%s': %s",
 436                                         work_tree, strerror(errno));
 437                 if (mkdir(work_tree, 0755))
 438                         die("could not create work tree dir '%s': %s.",
 439                                         work_tree, strerror(errno));
 440                 set_git_work_tree(work_tree);
 441         }
 442         junk_git_dir = git_dir;
 443         atexit(remove_junk);
 444         signal(SIGINT, remove_junk_on_signal);
 445
 446         setenv(CONFIG_ENVIRONMENT, xstrdup(mkpath("%s/config", git_dir)), 1);
 447
 448         if (safe_create_leading_directories_const(git_dir) < 0)
 449                 die("could not create leading directories of '%s'", git_dir);
 450         set_git_dir(make_absolute_path(git_dir));
 451
 452         init_db(option_template, option_quiet ? INIT_DB_QUIET : 0);
 453
 454         /*
 455          * At this point, the config exists, so we do not need the
 456          * environment variable.  We actually need to unset it, too, to
 457          * re-enable parsing of the global configs.
 458          */
 459         unsetenv(CONFIG_ENVIRONMENT);
 460
 461         if (option_reference)
 462                 setup_reference(git_dir);
 463
 464         git_config(git_default_config, NULL);
 465
 466         if (option_bare) {
 467                 if (option_mirror)
 468                         src_ref_prefix = "refs/";
 469                 strcpy(branch_top, src_ref_prefix);
 470
 471                 git_config_set("core.bare", "true");
 472         } else {
 473                 snprintf(branch_top, sizeof(branch_top),
 474                          "refs/remotes/%s/", option_origin);
 475         }
 476
 477         if (option_mirror || !option_bare) {
 478                 /* Configure the remote */
 479                 if (option_mirror) {
 480                         snprintf(key, sizeof(key),
 481                                         "remote.%s.mirror", option_origin);
 482                         git_config_set(key, "true");
 483                 }
 484
 485                 snprintf(key, sizeof(key), "remote.%s.url", option_origin);
 486                 git_config_set(key, repo);
 487
 488                 snprintf(key, sizeof(key), "remote.%s.fetch", option_origin);
 489                 snprintf(value, sizeof(value),
 490                                 "+%s*:%s*", src_ref_prefix, branch_top);
 491                 git_config_set_multivar(key, value, "^$", 0);
 492         }
 493
 494         refspec.force = 0;
 495         refspec.pattern = 1;
 496         refspec.src = src_ref_prefix;
 497         refspec.dst = branch_top;
 498
 499         if (path && !is_bundle)
 500                 refs = clone_local(path, git_dir);
 501         else {
 502                 struct remote *remote = remote_get(argv[0]);
 503                 transport = transport_get(remote, remote->url[0]);
 504
 505                 if (!transport->get_refs_list || !transport->fetch)
 506                         die("Don't know how to clone %s", transport->url);
 507
 508                 transport_set_option(transport, TRANS_OPT_KEEP, "yes");
 509
 510                 if (option_depth)
 511                         transport_set_option(transport, TRANS_OPT_DEPTH,
 512                                              option_depth);
 513
 514                 if (option_quiet)
 515                         transport->verbose = -1;
 516
 517                 if (option_upload_pack)
 518                         transport_set_option(transport, TRANS_OPT_UPLOADPACK,
 519                                              option_upload_pack);
 520
 521                 refs = transport_get_remote_refs(transport);
 522                 transport_fetch_refs(transport, refs);
 523         }
 524
 525         clear_extra_refs();
 526
 527         mapped_refs = write_remote_refs(refs, &refspec, reflog_msg.buf);
 528
 529         head_points_at = locate_head(refs, mapped_refs, &remote_head);
 530
 531         if (head_points_at) {
 532                 /* Local default branch link */
 533                 create_symref("HEAD", head_points_at->name, NULL);
 534
 535                 if (!option_bare) {
 536                         struct strbuf head_ref;
 537                         const char *head = head_points_at->name;
 538
 539                         if (!prefixcmp(head, "refs/heads/"))
 540                                 head += 11;
 541
 542                         /* Set up the initial local branch */
 543
 544                         /* Local branch initial value */
 545                         update_ref(reflog_msg.buf, "HEAD",
 546                                    head_points_at->old_sha1,
 547                                    NULL, 0, DIE_ON_ERR);
 548
 549                         strbuf_init(&head_ref, 0);
 550                         strbuf_addstr(&head_ref, branch_top);
 551                         strbuf_addstr(&head_ref, "HEAD");
 552
 553                         /* Remote branch link */
 554                         create_symref(head_ref.buf,
 555                                       head_points_at->peer_ref->name,
 556                                       reflog_msg.buf);
 557
 558                         snprintf(key, sizeof(key), "branch.%s.remote", head);
 559                         git_config_set(key, option_origin);
 560                         snprintf(key, sizeof(key), "branch.%s.merge", head);
 561                         git_config_set(key, 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
 580         if (!option_no_checkout) {
 581                 struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file));
 582                 struct unpack_trees_options opts;
 583                 struct tree *tree;
 584                 struct tree_desc t;
 585                 int fd;
 586
 587                 /* We need to be in the new work tree for the checkout */
 588                 setup_work_tree();
 589
 590                 fd = hold_locked_index(lock_file, 1);
 591
 592                 memset(&opts, 0, sizeof opts);
 593                 opts.update = 1;
 594                 opts.merge = 1;
 595                 opts.fn = oneway_merge;
 596                 opts.verbose_update = !option_quiet;
 597                 opts.src_index = &the_index;
 598                 opts.dst_index = &the_index;
 599
 600                 tree = parse_tree_indirect(remote_head->old_sha1);
 601                 parse_tree(tree);
 602                 init_tree_desc(&t, tree->buffer, tree->size);
 603                 unpack_trees(1, &t, &opts);
 604
 605                 if (write_cache(fd, active_cache, active_nr) ||
 606                     commit_locked_index(lock_file))
 607                         die("unable to write new index file");
 608         }
 609
 610         strbuf_release(&reflog_msg);
 611         junk_pid = 0;
 612         return 0;
 613 }