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
  22 /*
  23  * Overall FIXMEs:
  24  *  - respect DB_ENVIRONMENT for .git/objects.
  25  *
  26  * Implementation notes:
  27  *  - dropping use-separate-remote and no-separate-remote compatibility
  28  *
  29  */
  30 static const char * const builtin_clone_usage[] = {
  31         "git-clone [options] [--] <repo> [<dir>]",
  32         NULL
  33 };
  34
  35 static int option_quiet, option_no_checkout, option_bare;
  36 static int option_local, option_no_hardlinks, option_shared;
  37 static char *option_template, *option_reference, *option_depth;
  38 static char *option_origin = NULL;
  39 static char *option_upload_pack = "git-upload-pack";
  40
  41 static struct option builtin_clone_options[] = {
  42         OPT__QUIET(&option_quiet),
  43         OPT_BOOLEAN('n', "no-checkout", &option_no_checkout,
  44                     "don't create a checkout"),
  45         OPT_BOOLEAN(0, "bare", &option_bare, "create a bare repository"),
  46         OPT_BOOLEAN(0, "naked", &option_bare, "create a bare repository"),
  47         OPT_BOOLEAN('l', "local", &option_local,
  48                     "to clone from a local repository"),
  49         OPT_BOOLEAN(0, "no-hardlinks", &option_no_hardlinks,
  50                     "don't use local hardlinks, always copy"),
  51         OPT_BOOLEAN('s', "shared", &option_shared,
  52                     "setup as shared repository"),
  53         OPT_STRING(0, "template", &option_template, "path",
  54                    "path the template repository"),
  55         OPT_STRING(0, "reference", &option_reference, "repo",
  56                    "reference repository"),
  57         OPT_STRING('o', "origin", &option_origin, "branch",
  58                    "use <branch> instead or 'origin' to track upstream"),
  59         OPT_STRING('u', "upload-pack", &option_upload_pack, "path",
  60                    "path to git-upload-pack on the remote"),
  61         OPT_STRING(0, "depth", &option_depth, "depth",
  62                     "create a shallow clone of that depth"),
  63
  64         OPT_END()
  65 };
  66
  67 static char *get_repo_path(const char *repo, int *is_bundle)
  68 {
  69         static char *suffix[] = { "/.git", ".git", "" };
  70         static char *bundle_suffix[] = { ".bundle", "" };
  71         struct stat st;
  72         int i;
  73
  74         for (i = 0; i < ARRAY_SIZE(suffix); i++) {
  75                 const char *path;
  76                 path = mkpath("%s%s", repo, suffix[i]);
  77                 if (!stat(path, &st) && S_ISDIR(st.st_mode)) {
  78                         *is_bundle = 0;
  79                         return xstrdup(make_absolute_path(path));
  80                 }
  81         }
  82
  83         for (i = 0; i < ARRAY_SIZE(bundle_suffix); i++) {
  84                 const char *path;
  85                 path = mkpath("%s%s", repo, bundle_suffix[i]);
  86                 if (!stat(path, &st) && S_ISREG(st.st_mode)) {
  87                         *is_bundle = 1;
  88                         return xstrdup(make_absolute_path(path));
  89                 }
  90         }
  91
  92         return NULL;
  93 }
  94
  95 static char *guess_dir_name(const char *repo, int is_bundle)
  96 {
  97         const char *p, *start, *end, *limit;
  98         int after_slash_or_colon;
  99
 100         /* Guess dir name from repository: strip trailing '/',
 101          * strip trailing '[:/]*.{git,bundle}', strip leading '.*[/:]'. */
 102
 103         after_slash_or_colon = 1;
 104         limit = repo + strlen(repo);
 105         start = repo;
 106         end = limit;
 107         for (p = repo; p < limit; p++) {
 108                 const char *prefix = is_bundle ? ".bundle" : ".git";
 109                 if (!prefixcmp(p, prefix)) {
 110                         if (!after_slash_or_colon)
 111                                 end = p;
 112                         p += strlen(prefix) - 1;
 113                 } else if (!prefixcmp(p, ".bundle")) {
 114                         if (!after_slash_or_colon)
 115                                 end = p;
 116                         p += 7;
 117                 } else if (*p == '/' || *p == ':') {
 118                         if (end == limit)
 119                                 end = p;
 120                         after_slash_or_colon = 1;
 121                 } else if (after_slash_or_colon) {
 122                         start = p;
 123                         end = limit;
 124                         after_slash_or_colon = 0;
 125                 }
 126         }
 127
 128         return xstrndup(start, end - start);
 129 }
 130
 131 static int is_directory(const char *path)
 132 {
 133         struct stat buf;
 134
 135         return !stat(path, &buf) && S_ISDIR(buf.st_mode);
 136 }
 137
 138 static void setup_reference(const char *repo)
 139 {
 140         const char *ref_git;
 141         char *ref_git_copy;
 142
 143         struct remote *remote;
 144         struct transport *transport;
 145         const struct ref *extra;
 146
 147         ref_git = make_absolute_path(option_reference);
 148
 149         if (is_directory(mkpath("%s/.git/objects", ref_git)))
 150                 ref_git = mkpath("%s/.git", ref_git);
 151         else if (!is_directory(mkpath("%s/objects", ref_git)))
 152                 die("reference repository '%s' is not a local directory.",
 153                     option_reference);
 154
 155         ref_git_copy = xstrdup(ref_git);
 156
 157         add_to_alternates_file(ref_git_copy);
 158
 159         remote = remote_get(ref_git_copy);
 160         transport = transport_get(remote, ref_git_copy);
 161         for (extra = transport_get_remote_refs(transport); extra;
 162              extra = extra->next)
 163                 add_extra_ref(extra->name, extra->old_sha1, 0);
 164
 165         transport_disconnect(transport);
 166
 167         free(ref_git_copy);
 168 }
 169
 170 static void copy_or_link_directory(char *src, char *dest)
 171 {
 172         struct dirent *de;
 173         struct stat buf;
 174         int src_len, dest_len;
 175         DIR *dir;
 176
 177         dir = opendir(src);
 178         if (!dir)
 179                 die("failed to open %s\n", src);
 180
 181         if (mkdir(dest, 0777)) {
 182                 if (errno != EEXIST)
 183                         die("failed to create directory %s\n", dest);
 184                 else if (stat(dest, &buf))
 185                         die("failed to stat %s\n", dest);
 186                 else if (!S_ISDIR(buf.st_mode))
 187                         die("%s exists and is not a directory\n", dest);
 188         }
 189
 190         src_len = strlen(src);
 191         src[src_len] = '/';
 192         dest_len = strlen(dest);
 193         dest[dest_len] = '/';
 194
 195         while ((de = readdir(dir)) != NULL) {
 196                 strcpy(src + src_len + 1, de->d_name);
 197                 strcpy(dest + dest_len + 1, de->d_name);
 198                 if (stat(src, &buf)) {
 199                         warning ("failed to stat %s\n", src);
 200                         continue;
 201                 }
 202                 if (S_ISDIR(buf.st_mode)) {
 203                         if (de->d_name[0] != '.')
 204                                 copy_or_link_directory(src, dest);
 205                         continue;
 206                 }
 207
 208                 if (unlink(dest) && errno != ENOENT)
 209                         die("failed to unlink %s\n", dest);
 210                 if (option_no_hardlinks) {
 211                         if (copy_file(dest, src, 0666))
 212                                 die("failed to copy file to %s\n", dest);
 213                 } else {
 214                         if (link(src, dest))
 215                                 die("failed to create link %s\n", dest);
 216                 }
 217         }
 218         closedir(dir);
 219 }
 220
 221 static const struct ref *clone_local(const char *src_repo,
 222                                      const char *dest_repo)
 223 {
 224         const struct ref *ret;
 225         char src[PATH_MAX];
 226         char dest[PATH_MAX];
 227         struct remote *remote;
 228         struct transport *transport;
 229
 230         if (option_shared)
 231                 add_to_alternates_file(src_repo);
 232         else {
 233                 snprintf(src, PATH_MAX, "%s/objects", src_repo);
 234                 snprintf(dest, PATH_MAX, "%s/objects", dest_repo);
 235                 copy_or_link_directory(src, dest);
 236         }
 237
 238         remote = remote_get(src_repo);
 239         transport = transport_get(remote, src_repo);
 240         ret = transport_get_remote_refs(transport);
 241         transport_disconnect(transport);
 242         return ret;
 243 }
 244
 245 static const char *junk_work_tree;
 246 static const char *junk_git_dir;
 247 pid_t junk_pid;
 248
 249 static void remove_junk(void)
 250 {
 251         struct strbuf sb;
 252         if (getpid() != junk_pid)
 253                 return;
 254         strbuf_init(&sb, 0);
 255         if (junk_git_dir) {
 256                 strbuf_addstr(&sb, junk_git_dir);
 257                 remove_dir_recursively(&sb, 0);
 258                 strbuf_reset(&sb);
 259         }
 260         if (junk_work_tree) {
 261                 strbuf_addstr(&sb, junk_work_tree);
 262                 remove_dir_recursively(&sb, 0);
 263                 strbuf_reset(&sb);
 264         }
 265 }
 266
 267 static void remove_junk_on_signal(int signo)
 268 {
 269         remove_junk();
 270         signal(SIGINT, SIG_DFL);
 271         raise(signo);
 272 }
 273
 274 static const struct ref *locate_head(const struct ref *refs,
 275                                      const struct ref *mapped_refs,
 276                                      const struct ref **remote_head_p)
 277 {
 278         const struct ref *remote_head = NULL;
 279         const struct ref *remote_master = NULL;
 280         const struct ref *r;
 281         for (r = refs; r; r = r->next)
 282                 if (!strcmp(r->name, "HEAD"))
 283                         remote_head = r;
 284
 285         for (r = mapped_refs; r; r = r->next)
 286                 if (!strcmp(r->name, "refs/heads/master"))
 287                         remote_master = r;
 288
 289         if (remote_head_p)
 290                 *remote_head_p = remote_head;
 291
 292         /* If there's no HEAD value at all, never mind. */
 293         if (!remote_head)
 294                 return NULL;
 295
 296         /* If refs/heads/master could be right, it is. */
 297         if (remote_master && !hashcmp(remote_master->old_sha1,
 298                                       remote_head->old_sha1))
 299                 return remote_master;
 300
 301         /* Look for another ref that points there */
 302         for (r = mapped_refs; r; r = r->next)
 303                 if (r != remote_head &&
 304                     !hashcmp(r->old_sha1, remote_head->old_sha1))
 305                         return r;
 306
 307         /* Nothing is the same */
 308         return NULL;
 309 }
 310
 311 static struct ref *write_remote_refs(const struct ref *refs,
 312                 struct refspec *refspec, const char *reflog)
 313 {
 314         struct ref *local_refs = NULL;
 315         struct ref **tail = &local_refs;
 316         struct ref *r;
 317
 318         get_fetch_map(refs, refspec, &tail, 0);
 319         get_fetch_map(refs, tag_refspec, &tail, 0);
 320
 321         for (r = local_refs; r; r = r->next)
 322                 update_ref(reflog,
 323                            r->peer_ref->name, r->old_sha1, NULL, 0, DIE_ON_ERR);
 324         return local_refs;
 325 }
 326
 327 int cmd_clone(int argc, const char **argv, const char *prefix)
 328 {
 329         int use_local_hardlinks = 1;
 330         int use_separate_remote = 1;
 331         int is_bundle = 0;
 332         struct stat buf;
 333         const char *repo_name, *repo, *work_tree, *git_dir;
 334         char *path, *dir;
 335         const struct ref *refs, *head_points_at, *remote_head, *mapped_refs;
 336         char branch_top[256], key[256], value[256];
 337         struct strbuf reflog_msg;
 338
 339         struct refspec refspec;
 340
 341         junk_pid = getpid();
 342
 343         argc = parse_options(argc, argv, builtin_clone_options,
 344                              builtin_clone_usage, 0);
 345
 346         if (argc == 0)
 347                 die("You must specify a repository to clone.");
 348
 349         if (option_no_hardlinks)
 350                 use_local_hardlinks = 0;
 351
 352         if (option_bare) {
 353                 if (option_origin)
 354                         die("--bare and --origin %s options are incompatible.",
 355                             option_origin);
 356                 option_no_checkout = 1;
 357                 use_separate_remote = 0;
 358         }
 359
 360         if (!option_origin)
 361                 option_origin = "origin";
 362
 363         repo_name = argv[0];
 364
 365         path = get_repo_path(repo_name, &is_bundle);
 366         if (path)
 367                 repo = path;
 368         else if (!strchr(repo_name, ':'))
 369                 repo = xstrdup(make_absolute_path(repo_name));
 370         else
 371                 repo = repo_name;
 372
 373         if (argc == 2)
 374                 dir = xstrdup(argv[1]);
 375         else
 376                 dir = guess_dir_name(repo_name, is_bundle);
 377
 378         if (!stat(dir, &buf))
 379                 die("destination directory '%s' already exists.", dir);
 380
 381         strbuf_init(&reflog_msg, 0);
 382         strbuf_addf(&reflog_msg, "clone: from %s", repo);
 383
 384         if (option_bare)
 385                 work_tree = NULL;
 386         else {
 387                 work_tree = getenv("GIT_WORK_TREE");
 388                 if (work_tree && !stat(work_tree, &buf))
 389                         die("working tree '%s' already exists.", work_tree);
 390         }
 391
 392         if (option_bare || work_tree)
 393                 git_dir = xstrdup(dir);
 394         else {
 395                 work_tree = dir;
 396                 git_dir = xstrdup(mkpath("%s/.git", dir));
 397         }
 398
 399         if (!option_bare) {
 400                 junk_work_tree = work_tree;
 401                 if (mkdir(work_tree, 0755))
 402                         die("could not create work tree dir '%s'.", work_tree);
 403                 set_git_work_tree(work_tree);
 404         }
 405         junk_git_dir = git_dir;
 406         atexit(remove_junk);
 407         signal(SIGINT, remove_junk_on_signal);
 408
 409         setenv(CONFIG_ENVIRONMENT, xstrdup(mkpath("%s/config", git_dir)), 1);
 410
 411         set_git_dir(make_absolute_path(git_dir));
 412
 413         fprintf(stderr, "Initialize %s\n", git_dir);
 414         init_db(option_template, option_quiet ? INIT_DB_QUIET : 0);
 415
 416         if (option_reference)
 417                 setup_reference(git_dir);
 418
 419         git_config(git_default_config);
 420
 421         if (option_bare) {
 422                 strcpy(branch_top, "refs/heads/");
 423
 424                 git_config_set("core.bare", "true");
 425         } else {
 426                 snprintf(branch_top, sizeof(branch_top),
 427                          "refs/remotes/%s/", option_origin);
 428
 429                 /* Configure the remote */
 430                 snprintf(key, sizeof(key), "remote.%s.url", option_origin);
 431                 git_config_set(key, repo);
 432
 433                 snprintf(key, sizeof(key), "remote.%s.fetch", option_origin);
 434                 snprintf(value, sizeof(value),
 435                                 "+refs/heads/*:%s*", branch_top);
 436                 git_config_set_multivar(key, value, "^$", 0);
 437         }
 438
 439         refspec.force = 0;
 440         refspec.pattern = 1;
 441         refspec.src = "refs/heads/";
 442         refspec.dst = branch_top;
 443
 444         if (path && !is_bundle)
 445                 refs = clone_local(path, git_dir);
 446         else {
 447                 struct remote *remote = remote_get(argv[0]);
 448                 struct transport *transport = transport_get(remote, argv[0]);
 449
 450                 transport_set_option(transport, TRANS_OPT_KEEP, "yes");
 451
 452                 if (option_depth)
 453                         transport_set_option(transport, TRANS_OPT_DEPTH,
 454                                              option_depth);
 455
 456                 if (option_quiet)
 457                         transport->verbose = -1;
 458
 459                 refs = transport_get_remote_refs(transport);
 460                 transport_fetch_refs(transport, refs);
 461         }
 462
 463         clear_extra_refs();
 464
 465         mapped_refs = write_remote_refs(refs, &refspec, reflog_msg.buf);
 466
 467         head_points_at = locate_head(refs, mapped_refs, &remote_head);
 468
 469         if (head_points_at) {
 470                 /* Local default branch link */
 471                 create_symref("HEAD", head_points_at->name, NULL);
 472
 473                 if (!option_bare) {
 474                         struct strbuf head_ref;
 475                         const char *head = head_points_at->name;
 476
 477                         if (!prefixcmp(head, "refs/heads/"))
 478                                 head += 11;
 479
 480                         /* Set up the initial local branch */
 481
 482                         /* Local branch initial value */
 483                         update_ref(reflog_msg.buf, "HEAD",
 484                                    head_points_at->old_sha1,
 485                                    NULL, 0, DIE_ON_ERR);
 486
 487                         strbuf_init(&head_ref, 0);
 488                         strbuf_addstr(&head_ref, branch_top);
 489                         strbuf_addstr(&head_ref, "HEAD");
 490
 491                         /* Remote branch link */
 492                         create_symref(head_ref.buf,
 493                                       head_points_at->peer_ref->name,
 494                                       reflog_msg.buf);
 495
 496                         snprintf(key, sizeof(key), "branch.%s.remote", head);
 497                         git_config_set(key, option_origin);
 498                         snprintf(key, sizeof(key), "branch.%s.merge", head);
 499                         git_config_set(key, head_points_at->name);
 500                 }
 501         } else if (remote_head) {
 502                 /* Source had detached HEAD pointing somewhere. */
 503                 if (!option_bare)
 504                         update_ref(reflog_msg.buf, "HEAD",
 505                                    remote_head->old_sha1,
 506                                    NULL, REF_NODEREF, DIE_ON_ERR);
 507         } else {
 508                 /* Nothing to checkout out */
 509                 if (!option_no_checkout)
 510                         warning("remote HEAD refers to nonexistent ref, "
 511                                 "unable to checkout.\n");
 512                 option_no_checkout = 1;
 513         }
 514
 515         if (!option_no_checkout) {
 516                 struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file));
 517                 struct unpack_trees_options opts;
 518                 struct tree *tree;
 519                 struct tree_desc t;
 520                 int fd;
 521
 522                 /* We need to be in the new work tree for the checkout */
 523                 setup_work_tree();
 524
 525                 fd = hold_locked_index(lock_file, 1);
 526
 527                 memset(&opts, 0, sizeof opts);
 528                 opts.update = 1;
 529                 opts.merge = 1;
 530                 opts.fn = oneway_merge;
 531                 opts.verbose_update = !option_quiet;
 532                 opts.src_index = &the_index;
 533                 opts.dst_index = &the_index;
 534
 535                 tree = parse_tree_indirect(remote_head->old_sha1);
 536                 parse_tree(tree);
 537                 init_tree_desc(&t, tree->buffer, tree->size);
 538                 unpack_trees(1, &t, &opts);
 539
 540                 if (write_cache(fd, active_cache, active_nr) ||
 541                     commit_locked_index(lock_file))
 542                         die("unable to write new index file");
 543         }
 544
 545         strbuf_release(&reflog_msg);
 546         junk_pid = 0;
 547         return 0;
 548 }