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 "builtin.h"
  12 #include "lockfile.h"
  13 #include "parse-options.h"
  14 #include "fetch-pack.h"
  15 #include "refs.h"
  16 #include "tree.h"
  17 #include "tree-walk.h"
  18 #include "unpack-trees.h"
  19 #include "transport.h"
  20 #include "strbuf.h"
  21 #include "dir.h"
  22 #include "sigchain.h"
  23 #include "branch.h"
  24 #include "remote.h"
  25 #include "run-command.h"
  26 #include "connected.h"
  27
  28 /*
  29  * Overall FIXMEs:
  30  *  - respect DB_ENVIRONMENT for .git/objects.
  31  *
  32  * Implementation notes:
  33  *  - dropping use-separate-remote and no-separate-remote compatibility
  34  *
  35  */
  36 static const char * const builtin_clone_usage[] = {
  37         N_("git clone [<options>] [--] <repo> [<dir>]"),
  38         NULL
  39 };
  40
  41 static int option_no_checkout, option_bare, option_mirror, option_single_branch = -1;
  42 static int option_local = -1, option_no_hardlinks, option_shared, option_recursive;
  43 static char *option_template, *option_depth;
  44 static char *option_origin = NULL;
  45 static char *option_branch = NULL;
  46 static const char *real_git_dir;
  47 static char *option_upload_pack = "git-upload-pack";
  48 static int option_verbosity;
  49 static int option_progress = -1;
  50 static struct string_list option_config;
  51 static struct string_list option_reference;
  52 static int option_dissociate;
  53
  54 static struct option builtin_clone_options[] = {
  55         OPT__VERBOSITY(&option_verbosity),
  56         OPT_BOOL(0, "progress", &option_progress,
  57                  N_("force progress reporting")),
  58         OPT_BOOL('n', "no-checkout", &option_no_checkout,
  59                  N_("don't create a checkout")),
  60         OPT_BOOL(0, "bare", &option_bare, N_("create a bare repository")),
  61         OPT_HIDDEN_BOOL(0, "naked", &option_bare,
  62                         N_("create a bare repository")),
  63         OPT_BOOL(0, "mirror", &option_mirror,
  64                  N_("create a mirror repository (implies bare)")),
  65         OPT_BOOL('l', "local", &option_local,
  66                 N_("to clone from a local repository")),
  67         OPT_BOOL(0, "no-hardlinks", &option_no_hardlinks,
  68                     N_("don't use local hardlinks, always copy")),
  69         OPT_BOOL('s', "shared", &option_shared,
  70                     N_("setup as shared repository")),
  71         OPT_BOOL(0, "recursive", &option_recursive,
  72                     N_("initialize submodules in the clone")),
  73         OPT_BOOL(0, "recurse-submodules", &option_recursive,
  74                     N_("initialize submodules in the clone")),
  75         OPT_STRING(0, "template", &option_template, N_("template-directory"),
  76                    N_("directory from which templates will be used")),
  77         OPT_STRING_LIST(0, "reference", &option_reference, N_("repo"),
  78                         N_("reference repository")),
  79         OPT_BOOL(0, "dissociate", &option_dissociate,
  80                  N_("use --reference only while cloning")),
  81         OPT_STRING('o', "origin", &option_origin, N_("name"),
  82                    N_("use <name> instead of 'origin' to track upstream")),
  83         OPT_STRING('b', "branch", &option_branch, N_("branch"),
  84                    N_("checkout <branch> instead of the remote's HEAD")),
  85         OPT_STRING('u', "upload-pack", &option_upload_pack, N_("path"),
  86                    N_("path to git-upload-pack on the remote")),
  87         OPT_STRING(0, "depth", &option_depth, N_("depth"),
  88                     N_("create a shallow clone of that depth")),
  89         OPT_BOOL(0, "single-branch", &option_single_branch,
  90                     N_("clone only one branch, HEAD or --branch")),
  91         OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
  92                    N_("separate git dir from working tree")),
  93         OPT_STRING_LIST('c', "config", &option_config, N_("key=value"),
  94                         N_("set config inside the new repository")),
  95         OPT_END()
  96 };
  97
  98 static const char *argv_submodule[] = {
  99         "submodule", "update", "--init", "--recursive", NULL
 100 };
 101
 102 static char *get_repo_path(const char *repo, int *is_bundle)
 103 {
 104         static char *suffix[] = { "/.git", "", ".git/.git", ".git" };
 105         static char *bundle_suffix[] = { ".bundle", "" };
 106         struct stat st;
 107         int i;
 108
 109         for (i = 0; i < ARRAY_SIZE(suffix); i++) {
 110                 const char *path;
 111                 path = mkpath("%s%s", repo, suffix[i]);
 112                 if (stat(path, &st))
 113                         continue;
 114                 if (S_ISDIR(st.st_mode) && is_git_directory(path)) {
 115                         *is_bundle = 0;
 116                         return xstrdup(absolute_path(path));
 117                 } else if (S_ISREG(st.st_mode) && st.st_size > 8) {
 118                         /* Is it a "gitfile"? */
 119                         char signature[8];
 120                         int len, fd = open(path, O_RDONLY);
 121                         if (fd < 0)
 122                                 continue;
 123                         len = read_in_full(fd, signature, 8);
 124                         close(fd);
 125                         if (len != 8 || strncmp(signature, "gitdir: ", 8))
 126                                 continue;
 127                         path = read_gitfile(path);
 128                         if (path) {
 129                                 *is_bundle = 0;
 130                                 return xstrdup(absolute_path(path));
 131                         }
 132                 }
 133         }
 134
 135         for (i = 0; i < ARRAY_SIZE(bundle_suffix); i++) {
 136                 const char *path;
 137                 path = mkpath("%s%s", repo, bundle_suffix[i]);
 138                 if (!stat(path, &st) && S_ISREG(st.st_mode)) {
 139                         *is_bundle = 1;
 140                         return xstrdup(absolute_path(path));
 141                 }
 142         }
 143
 144         return NULL;
 145 }
 146
 147 static char *guess_dir_name(const char *repo, int is_bundle, int is_bare)
 148 {
 149         const char *end = repo + strlen(repo), *start;
 150         size_t len;
 151         char *dir;
 152
 153         /*
 154          * Strip trailing spaces, slashes and /.git
 155          */
 156         while (repo < end && (is_dir_sep(end[-1]) || isspace(end[-1])))
 157                 end--;
 158         if (end - repo > 5 && is_dir_sep(end[-5]) &&
 159             !strncmp(end - 4, ".git", 4)) {
 160                 end -= 5;
 161                 while (repo < end && is_dir_sep(end[-1]))
 162                         end--;
 163         }
 164
 165         /*
 166          * Find last component, but be prepared that repo could have
 167          * the form  "remote.example.com:foo.git", i.e. no slash
 168          * in the directory part.
 169          */
 170         start = end;
 171         while (repo < start && !is_dir_sep(start[-1]) && start[-1] != ':')
 172                 start--;
 173
 174         /*
 175          * Strip .{bundle,git}.
 176          */
 177         strip_suffix(start, is_bundle ? ".bundle" : ".git" , &len);
 178
 179         if (is_bare)
 180                 dir = xstrfmt("%.*s.git", (int)len, start);
 181         else
 182                 dir = xstrndup(start, len);
 183         /*
 184          * Replace sequences of 'control' characters and whitespace
 185          * with one ascii space, remove leading and trailing spaces.
 186          */
 187         if (*dir) {
 188                 char *out = dir;
 189                 int prev_space = 1 /* strip leading whitespace */;
 190                 for (end = dir; *end; ++end) {
 191                         char ch = *end;
 192                         if ((unsigned char)ch < '\x20')
 193                                 ch = '\x20';
 194                         if (isspace(ch)) {
 195                                 if (prev_space)
 196                                         continue;
 197                                 prev_space = 1;
 198                         } else
 199                                 prev_space = 0;
 200                         *out++ = ch;
 201                 }
 202                 *out = '\0';
 203                 if (out > dir && prev_space)
 204                         out[-1] = '\0';
 205         }
 206         return dir;
 207 }
 208
 209 static void strip_trailing_slashes(char *dir)
 210 {
 211         char *end = dir + strlen(dir);
 212
 213         while (dir < end - 1 && is_dir_sep(end[-1]))
 214                 end--;
 215         *end = '\0';
 216 }
 217
 218 static int add_one_reference(struct string_list_item *item, void *cb_data)
 219 {
 220         char *ref_git;
 221         const char *repo;
 222         struct strbuf alternate = STRBUF_INIT;
 223
 224         /* Beware: read_gitfile(), real_path() and mkpath() return static buffer */
 225         ref_git = xstrdup(real_path(item->string));
 226
 227         repo = read_gitfile(ref_git);
 228         if (!repo)
 229                 repo = read_gitfile(mkpath("%s/.git", ref_git));
 230         if (repo) {
 231                 free(ref_git);
 232                 ref_git = xstrdup(repo);
 233         }
 234
 235         if (!repo && is_directory(mkpath("%s/.git/objects", ref_git))) {
 236                 char *ref_git_git = mkpathdup("%s/.git", ref_git);
 237                 free(ref_git);
 238                 ref_git = ref_git_git;
 239         } else if (!is_directory(mkpath("%s/objects", ref_git)))
 240                 die(_("reference repository '%s' is not a local repository."),
 241                     item->string);
 242
 243         if (!access(mkpath("%s/shallow", ref_git), F_OK))
 244                 die(_("reference repository '%s' is shallow"), item->string);
 245
 246         if (!access(mkpath("%s/info/grafts", ref_git), F_OK))
 247                 die(_("reference repository '%s' is grafted"), item->string);
 248
 249         strbuf_addf(&alternate, "%s/objects", ref_git);
 250         add_to_alternates_file(alternate.buf);
 251         strbuf_release(&alternate);
 252         free(ref_git);
 253         return 0;
 254 }
 255
 256 static void setup_reference(void)
 257 {
 258         for_each_string_list(&option_reference, add_one_reference, NULL);
 259 }
 260
 261 static void copy_alternates(struct strbuf *src, struct strbuf *dst,
 262                             const char *src_repo)
 263 {
 264         /*
 265          * Read from the source objects/info/alternates file
 266          * and copy the entries to corresponding file in the
 267          * destination repository with add_to_alternates_file().
 268          * Both src and dst have "$path/objects/info/alternates".
 269          *
 270          * Instead of copying bit-for-bit from the original,
 271          * we need to append to existing one so that the already
 272          * created entry via "clone -s" is not lost, and also
 273          * to turn entries with paths relative to the original
 274          * absolute, so that they can be used in the new repository.
 275          */
 276         FILE *in = fopen(src->buf, "r");
 277         struct strbuf line = STRBUF_INIT;
 278
 279         while (strbuf_getline(&line, in, '\n') != EOF) {
 280                 char *abs_path;
 281                 if (!line.len || line.buf[0] == '#')
 282                         continue;
 283                 if (is_absolute_path(line.buf)) {
 284                         add_to_alternates_file(line.buf);
 285                         continue;
 286                 }
 287                 abs_path = mkpathdup("%s/objects/%s", src_repo, line.buf);
 288                 normalize_path_copy(abs_path, abs_path);
 289                 add_to_alternates_file(abs_path);
 290                 free(abs_path);
 291         }
 292         strbuf_release(&line);
 293         fclose(in);
 294 }
 295
 296 static void copy_or_link_directory(struct strbuf *src, struct strbuf *dest,
 297                                    const char *src_repo, int src_baselen)
 298 {
 299         struct dirent *de;
 300         struct stat buf;
 301         int src_len, dest_len;
 302         DIR *dir;
 303
 304         dir = opendir(src->buf);
 305         if (!dir)
 306                 die_errno(_("failed to open '%s'"), src->buf);
 307
 308         if (mkdir(dest->buf, 0777)) {
 309                 if (errno != EEXIST)
 310                         die_errno(_("failed to create directory '%s'"), dest->buf);
 311                 else if (stat(dest->buf, &buf))
 312                         die_errno(_("failed to stat '%s'"), dest->buf);
 313                 else if (!S_ISDIR(buf.st_mode))
 314                         die(_("%s exists and is not a directory"), dest->buf);
 315         }
 316
 317         strbuf_addch(src, '/');
 318         src_len = src->len;
 319         strbuf_addch(dest, '/');
 320         dest_len = dest->len;
 321
 322         while ((de = readdir(dir)) != NULL) {
 323                 strbuf_setlen(src, src_len);
 324                 strbuf_addstr(src, de->d_name);
 325                 strbuf_setlen(dest, dest_len);
 326                 strbuf_addstr(dest, de->d_name);
 327                 if (stat(src->buf, &buf)) {
 328                         warning (_("failed to stat %s\n"), src->buf);
 329                         continue;
 330                 }
 331                 if (S_ISDIR(buf.st_mode)) {
 332                         if (de->d_name[0] != '.')
 333                                 copy_or_link_directory(src, dest,
 334                                                        src_repo, src_baselen);
 335                         continue;
 336                 }
 337
 338                 /* Files that cannot be copied bit-for-bit... */
 339                 if (!strcmp(src->buf + src_baselen, "/info/alternates")) {
 340                         copy_alternates(src, dest, src_repo);
 341                         continue;
 342                 }
 343
 344                 if (unlink(dest->buf) && errno != ENOENT)
 345                         die_errno(_("failed to unlink '%s'"), dest->buf);
 346                 if (!option_no_hardlinks) {
 347                         if (!link(src->buf, dest->buf))
 348                                 continue;
 349                         if (option_local > 0)
 350                                 die_errno(_("failed to create link '%s'"), dest->buf);
 351                         option_no_hardlinks = 1;
 352                 }
 353                 if (copy_file_with_time(dest->buf, src->buf, 0666))
 354                         die_errno(_("failed to copy file to '%s'"), dest->buf);
 355         }
 356         closedir(dir);
 357 }
 358
 359 static void clone_local(const char *src_repo, const char *dest_repo)
 360 {
 361         if (option_shared) {
 362                 struct strbuf alt = STRBUF_INIT;
 363                 strbuf_addf(&alt, "%s/objects", src_repo);
 364                 add_to_alternates_file(alt.buf);
 365                 strbuf_release(&alt);
 366         } else {
 367                 struct strbuf src = STRBUF_INIT;
 368                 struct strbuf dest = STRBUF_INIT;
 369                 strbuf_addf(&src, "%s/objects", src_repo);
 370                 strbuf_addf(&dest, "%s/objects", dest_repo);
 371                 copy_or_link_directory(&src, &dest, src_repo, src.len);
 372                 strbuf_release(&src);
 373                 strbuf_release(&dest);
 374         }
 375
 376         if (0 <= option_verbosity)
 377                 fprintf(stderr, _("done.\n"));
 378 }
 379
 380 static const char *junk_work_tree;
 381 static const char *junk_git_dir;
 382 static enum {
 383         JUNK_LEAVE_NONE,
 384         JUNK_LEAVE_REPO,
 385         JUNK_LEAVE_ALL
 386 } junk_mode = JUNK_LEAVE_NONE;
 387
 388 static const char junk_leave_repo_msg[] =
 389 N_("Clone succeeded, but checkout failed.\n"
 390    "You can inspect what was checked out with 'git status'\n"
 391    "and retry the checkout with 'git checkout -f HEAD'\n");
 392
 393 static void remove_junk(void)
 394 {
 395         struct strbuf sb = STRBUF_INIT;
 396
 397         switch (junk_mode) {
 398         case JUNK_LEAVE_REPO:
 399                 warning("%s", _(junk_leave_repo_msg));
 400                 /* fall-through */
 401         case JUNK_LEAVE_ALL:
 402                 return;
 403         default:
 404                 /* proceed to removal */
 405                 break;
 406         }
 407
 408         if (junk_git_dir) {
 409                 strbuf_addstr(&sb, junk_git_dir);
 410                 remove_dir_recursively(&sb, 0);
 411                 strbuf_reset(&sb);
 412         }
 413         if (junk_work_tree) {
 414                 strbuf_addstr(&sb, junk_work_tree);
 415                 remove_dir_recursively(&sb, 0);
 416                 strbuf_reset(&sb);
 417         }
 418 }
 419
 420 static void remove_junk_on_signal(int signo)
 421 {
 422         remove_junk();
 423         sigchain_pop(signo);
 424         raise(signo);
 425 }
 426
 427 static struct ref *find_remote_branch(const struct ref *refs, const char *branch)
 428 {
 429         struct ref *ref;
 430         struct strbuf head = STRBUF_INIT;
 431         strbuf_addstr(&head, "refs/heads/");
 432         strbuf_addstr(&head, branch);
 433         ref = find_ref_by_name(refs, head.buf);
 434         strbuf_release(&head);
 435
 436         if (ref)
 437                 return ref;
 438
 439         strbuf_addstr(&head, "refs/tags/");
 440         strbuf_addstr(&head, branch);
 441         ref = find_ref_by_name(refs, head.buf);
 442         strbuf_release(&head);
 443
 444         return ref;
 445 }
 446
 447 static struct ref *wanted_peer_refs(const struct ref *refs,
 448                 struct refspec *refspec)
 449 {
 450         struct ref *head = copy_ref(find_ref_by_name(refs, "HEAD"));
 451         struct ref *local_refs = head;
 452         struct ref **tail = head ? &head->next : &local_refs;
 453
 454         if (option_single_branch) {
 455                 struct ref *remote_head = NULL;
 456
 457                 if (!option_branch)
 458                         remote_head = guess_remote_head(head, refs, 0);
 459                 else {
 460                         local_refs = NULL;
 461                         tail = &local_refs;
 462                         remote_head = copy_ref(find_remote_branch(refs, option_branch));
 463                 }
 464
 465                 if (!remote_head && option_branch)
 466                         warning(_("Could not find remote branch %s to clone."),
 467                                 option_branch);
 468                 else {
 469                         get_fetch_map(remote_head, refspec, &tail, 0);
 470
 471                         /* if --branch=tag, pull the requested tag explicitly */
 472                         get_fetch_map(remote_head, tag_refspec, &tail, 0);
 473                 }
 474         } else
 475                 get_fetch_map(refs, refspec, &tail, 0);
 476
 477         if (!option_mirror && !option_single_branch)
 478                 get_fetch_map(refs, tag_refspec, &tail, 0);
 479
 480         return local_refs;
 481 }
 482
 483 static void write_remote_refs(const struct ref *local_refs)
 484 {
 485         const struct ref *r;
 486
 487         lock_packed_refs(LOCK_DIE_ON_ERROR);
 488
 489         for (r = local_refs; r; r = r->next) {
 490                 if (!r->peer_ref)
 491                         continue;
 492                 add_packed_ref(r->peer_ref->name, r->old_sha1);
 493         }
 494
 495         if (commit_packed_refs())
 496                 die_errno("unable to overwrite old ref-pack file");
 497 }
 498
 499 static void write_followtags(const struct ref *refs, const char *msg)
 500 {
 501         const struct ref *ref;
 502         for (ref = refs; ref; ref = ref->next) {
 503                 if (!starts_with(ref->name, "refs/tags/"))
 504                         continue;
 505                 if (ends_with(ref->name, "^{}"))
 506                         continue;
 507                 if (!has_sha1_file(ref->old_sha1))
 508                         continue;
 509                 update_ref(msg, ref->name, ref->old_sha1,
 510                            NULL, 0, UPDATE_REFS_DIE_ON_ERR);
 511         }
 512 }
 513
 514 static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
 515 {
 516         struct ref **rm = cb_data;
 517         struct ref *ref = *rm;
 518
 519         /*
 520          * Skip anything missing a peer_ref, which we are not
 521          * actually going to write a ref for.
 522          */
 523         while (ref && !ref->peer_ref)
 524                 ref = ref->next;
 525         /* Returning -1 notes "end of list" to the caller. */
 526         if (!ref)
 527                 return -1;
 528
 529         hashcpy(sha1, ref->old_sha1);
 530         *rm = ref->next;
 531         return 0;
 532 }
 533
 534 static void update_remote_refs(const struct ref *refs,
 535                                const struct ref *mapped_refs,
 536                                const struct ref *remote_head_points_at,
 537                                const char *branch_top,
 538                                const char *msg,
 539                                struct transport *transport,
 540                                int check_connectivity)
 541 {
 542         const struct ref *rm = mapped_refs;
 543
 544         if (check_connectivity) {
 545                 if (transport->progress)
 546                         fprintf(stderr, _("Checking connectivity... "));
 547                 if (check_everything_connected_with_transport(iterate_ref_map,
 548                                                               0, &rm, transport))
 549                         die(_("remote did not send all necessary objects"));
 550                 if (transport->progress)
 551                         fprintf(stderr, _("done.\n"));
 552         }
 553
 554         if (refs) {
 555                 write_remote_refs(mapped_refs);
 556                 if (option_single_branch)
 557                         write_followtags(refs, msg);
 558         }
 559
 560         if (remote_head_points_at && !option_bare) {
 561                 struct strbuf head_ref = STRBUF_INIT;
 562                 strbuf_addstr(&head_ref, branch_top);
 563                 strbuf_addstr(&head_ref, "HEAD");
 564                 create_symref(head_ref.buf,
 565                               remote_head_points_at->peer_ref->name,
 566                               msg);
 567         }
 568 }
 569
 570 static void update_head(const struct ref *our, const struct ref *remote,
 571                         const char *msg)
 572 {
 573         const char *head;
 574         if (our && skip_prefix(our->name, "refs/heads/", &head)) {
 575                 /* Local default branch link */
 576                 create_symref("HEAD", our->name, NULL);
 577                 if (!option_bare) {
 578                         update_ref(msg, "HEAD", our->old_sha1, NULL, 0,
 579                                    UPDATE_REFS_DIE_ON_ERR);
 580                         install_branch_config(0, head, option_origin, our->name);
 581                 }
 582         } else if (our) {
 583                 struct commit *c = lookup_commit_reference(our->old_sha1);
 584                 /* --branch specifies a non-branch (i.e. tags), detach HEAD */
 585                 update_ref(msg, "HEAD", c->object.sha1,
 586                            NULL, REF_NODEREF, UPDATE_REFS_DIE_ON_ERR);
 587         } else if (remote) {
 588                 /*
 589                  * We know remote HEAD points to a non-branch, or
 590                  * HEAD points to a branch but we don't know which one.
 591                  * Detach HEAD in all these cases.
 592                  */
 593                 update_ref(msg, "HEAD", remote->old_sha1,
 594                            NULL, REF_NODEREF, UPDATE_REFS_DIE_ON_ERR);
 595         }
 596 }
 597
 598 static int checkout(void)
 599 {
 600         unsigned char sha1[20];
 601         char *head;
 602         struct lock_file *lock_file;
 603         struct unpack_trees_options opts;
 604         struct tree *tree;
 605         struct tree_desc t;
 606         int err = 0;
 607
 608         if (option_no_checkout)
 609                 return 0;
 610
 611         head = resolve_refdup("HEAD", RESOLVE_REF_READING, sha1, NULL);
 612         if (!head) {
 613                 warning(_("remote HEAD refers to nonexistent ref, "
 614                           "unable to checkout.\n"));
 615                 return 0;
 616         }
 617         if (!strcmp(head, "HEAD")) {
 618                 if (advice_detached_head)
 619                         detach_advice(sha1_to_hex(sha1));
 620         } else {
 621                 if (!starts_with(head, "refs/heads/"))
 622                         die(_("HEAD not found below refs/heads!"));
 623         }
 624         free(head);
 625
 626         /* We need to be in the new work tree for the checkout */
 627         setup_work_tree();
 628
 629         lock_file = xcalloc(1, sizeof(struct lock_file));
 630         hold_locked_index(lock_file, 1);
 631
 632         memset(&opts, 0, sizeof opts);
 633         opts.update = 1;
 634         opts.merge = 1;
 635         opts.fn = oneway_merge;
 636         opts.verbose_update = (option_verbosity >= 0);
 637         opts.src_index = &the_index;
 638         opts.dst_index = &the_index;
 639
 640         tree = parse_tree_indirect(sha1);
 641         parse_tree(tree);
 642         init_tree_desc(&t, tree->buffer, tree->size);
 643         if (unpack_trees(1, &t, &opts) < 0)
 644                 die(_("unable to checkout working tree"));
 645
 646         if (write_locked_index(&the_index, lock_file, COMMIT_LOCK))
 647                 die(_("unable to write new index file"));
 648
 649         err |= run_hook_le(NULL, "post-checkout", sha1_to_hex(null_sha1),
 650                            sha1_to_hex(sha1), "1", NULL);
 651
 652         if (!err && option_recursive)
 653                 err = run_command_v_opt(argv_submodule, RUN_GIT_CMD);
 654
 655         return err;
 656 }
 657
 658 static int write_one_config(const char *key, const char *value, void *data)
 659 {
 660         return git_config_set_multivar(key, value ? value : "true", "^$", 0);
 661 }
 662
 663 static void write_config(struct string_list *config)
 664 {
 665         int i;
 666
 667         for (i = 0; i < config->nr; i++) {
 668                 if (git_config_parse_parameter(config->items[i].string,
 669                                                write_one_config, NULL) < 0)
 670                         die("unable to write parameters to config file");
 671         }
 672 }
 673
 674 static void write_refspec_config(const char *src_ref_prefix,
 675                 const struct ref *our_head_points_at,
 676                 const struct ref *remote_head_points_at,
 677                 struct strbuf *branch_top)
 678 {
 679         struct strbuf key = STRBUF_INIT;
 680         struct strbuf value = STRBUF_INIT;
 681
 682         if (option_mirror || !option_bare) {
 683                 if (option_single_branch && !option_mirror) {
 684                         if (option_branch) {
 685                                 if (starts_with(our_head_points_at->name, "refs/tags/"))
 686                                         strbuf_addf(&value, "+%s:%s", our_head_points_at->name,
 687                                                 our_head_points_at->name);
 688                                 else
 689                                         strbuf_addf(&value, "+%s:%s%s", our_head_points_at->name,
 690                                                 branch_top->buf, option_branch);
 691                         } else if (remote_head_points_at) {
 692                                 const char *head = remote_head_points_at->name;
 693                                 if (!skip_prefix(head, "refs/heads/", &head))
 694                                         die("BUG: remote HEAD points at non-head?");
 695
 696                                 strbuf_addf(&value, "+%s:%s%s", remote_head_points_at->name,
 697                                                 branch_top->buf, head);
 698                         }
 699                         /*
 700                          * otherwise, the next "git fetch" will
 701                          * simply fetch from HEAD without updating
 702                          * any remote-tracking branch, which is what
 703                          * we want.
 704                          */
 705                 } else {
 706                         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top->buf);
 707                 }
 708                 /* Configure the remote */
 709                 if (value.len) {
 710                         strbuf_addf(&key, "remote.%s.fetch", option_origin);
 711                         git_config_set_multivar(key.buf, value.buf, "^$", 0);
 712                         strbuf_reset(&key);
 713
 714                         if (option_mirror) {
 715                                 strbuf_addf(&key, "remote.%s.mirror", option_origin);
 716                                 git_config_set(key.buf, "true");
 717                                 strbuf_reset(&key);
 718                         }
 719                 }
 720         }
 721
 722         strbuf_release(&key);
 723         strbuf_release(&value);
 724 }
 725
 726 static void dissociate_from_references(void)
 727 {
 728         static const char* argv[] = { "repack", "-a", "-d", NULL };
 729
 730         if (run_command_v_opt(argv, RUN_GIT_CMD|RUN_COMMAND_NO_STDIN))
 731                 die(_("cannot repack to clean up"));
 732         if (unlink(git_path("objects/info/alternates")) && errno != ENOENT)
 733                 die_errno(_("cannot unlink temporary alternates file"));
 734 }
 735
 736 int cmd_clone(int argc, const char **argv, const char *prefix)
 737 {
 738         int is_bundle = 0, is_local;
 739         struct stat buf;
 740         const char *repo_name, *repo, *work_tree, *git_dir;
 741         char *path, *dir;
 742         int dest_exists;
 743         const struct ref *refs, *remote_head;
 744         const struct ref *remote_head_points_at;
 745         const struct ref *our_head_points_at;
 746         struct ref *mapped_refs;
 747         const struct ref *ref;
 748         struct strbuf key = STRBUF_INIT, value = STRBUF_INIT;
 749         struct strbuf branch_top = STRBUF_INIT, reflog_msg = STRBUF_INIT;
 750         struct transport *transport = NULL;
 751         const char *src_ref_prefix = "refs/heads/";
 752         struct remote *remote;
 753         int err = 0, complete_refs_before_fetch = 1;
 754
 755         struct refspec *refspec;
 756         const char *fetch_pattern;
 757
 758         packet_trace_identity("clone");
 759         argc = parse_options(argc, argv, prefix, builtin_clone_options,
 760                              builtin_clone_usage, 0);
 761
 762         if (argc > 2)
 763                 usage_msg_opt(_("Too many arguments."),
 764                         builtin_clone_usage, builtin_clone_options);
 765
 766         if (argc == 0)
 767                 usage_msg_opt(_("You must specify a repository to clone."),
 768                         builtin_clone_usage, builtin_clone_options);
 769
 770         if (option_single_branch == -1)
 771                 option_single_branch = option_depth ? 1 : 0;
 772
 773         if (option_mirror)
 774                 option_bare = 1;
 775
 776         if (option_bare) {
 777                 if (option_origin)
 778                         die(_("--bare and --origin %s options are incompatible."),
 779                             option_origin);
 780                 if (real_git_dir)
 781                         die(_("--bare and --separate-git-dir are incompatible."));
 782                 option_no_checkout = 1;
 783         }
 784
 785         if (!option_origin)
 786                 option_origin = "origin";
 787
 788         repo_name = argv[0];
 789
 790         path = get_repo_path(repo_name, &is_bundle);
 791         if (path)
 792                 repo = xstrdup(absolute_path(repo_name));
 793         else if (!strchr(repo_name, ':'))
 794                 die(_("repository '%s' does not exist"), repo_name);
 795         else
 796                 repo = repo_name;
 797
 798         /* no need to be strict, transport_set_option() will validate it again */
 799         if (option_depth && atoi(option_depth) < 1)
 800                 die(_("depth %s is not a positive number"), option_depth);
 801
 802         if (argc == 2)
 803                 dir = xstrdup(argv[1]);
 804         else
 805                 dir = guess_dir_name(repo_name, is_bundle, option_bare);
 806         strip_trailing_slashes(dir);
 807
 808         dest_exists = !stat(dir, &buf);
 809         if (dest_exists && !is_empty_dir(dir))
 810                 die(_("destination path '%s' already exists and is not "
 811                         "an empty directory."), dir);
 812
 813         strbuf_addf(&reflog_msg, "clone: from %s", repo);
 814
 815         if (option_bare)
 816                 work_tree = NULL;
 817         else {
 818                 work_tree = getenv("GIT_WORK_TREE");
 819                 if (work_tree && !stat(work_tree, &buf))
 820                         die(_("working tree '%s' already exists."), work_tree);
 821         }
 822
 823         if (option_bare || work_tree)
 824                 git_dir = xstrdup(dir);
 825         else {
 826                 work_tree = dir;
 827                 git_dir = mkpathdup("%s/.git", dir);
 828         }
 829
 830         atexit(remove_junk);
 831         sigchain_push_common(remove_junk_on_signal);
 832
 833         if (!option_bare) {
 834                 if (safe_create_leading_directories_const(work_tree) < 0)
 835                         die_errno(_("could not create leading directories of '%s'"),
 836                                   work_tree);
 837                 if (!dest_exists && mkdir(work_tree, 0777))
 838                         die_errno(_("could not create work tree dir '%s'"),
 839                                   work_tree);
 840                 junk_work_tree = work_tree;
 841                 set_git_work_tree(work_tree);
 842         }
 843
 844         junk_git_dir = git_dir;
 845         if (safe_create_leading_directories_const(git_dir) < 0)
 846                 die(_("could not create leading directories of '%s'"), git_dir);
 847
 848         set_git_dir_init(git_dir, real_git_dir, 0);
 849         if (real_git_dir) {
 850                 git_dir = real_git_dir;
 851                 junk_git_dir = real_git_dir;
 852         }
 853
 854         if (0 <= option_verbosity) {
 855                 if (option_bare)
 856                         fprintf(stderr, _("Cloning into bare repository '%s'...\n"), dir);
 857                 else
 858                         fprintf(stderr, _("Cloning into '%s'...\n"), dir);
 859         }
 860         init_db(option_template, INIT_DB_QUIET);
 861         write_config(&option_config);
 862
 863         git_config(git_default_config, NULL);
 864
 865         if (option_bare) {
 866                 if (option_mirror)
 867                         src_ref_prefix = "refs/";
 868                 strbuf_addstr(&branch_top, src_ref_prefix);
 869
 870                 git_config_set("core.bare", "true");
 871         } else {
 872                 strbuf_addf(&branch_top, "refs/remotes/%s/", option_origin);
 873         }
 874
 875         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top.buf);
 876         strbuf_addf(&key, "remote.%s.url", option_origin);
 877         git_config_set(key.buf, repo);
 878         strbuf_reset(&key);
 879
 880         if (option_reference.nr)
 881                 setup_reference();
 882         else if (option_dissociate) {
 883                 warning(_("--dissociate given, but there is no --reference"));
 884                 option_dissociate = 0;
 885         }
 886
 887         fetch_pattern = value.buf;
 888         refspec = parse_fetch_refspec(1, &fetch_pattern);
 889
 890         strbuf_reset(&value);
 891
 892         remote = remote_get(option_origin);
 893         transport = transport_get(remote, remote->url[0]);
 894         transport_set_verbosity(transport, option_verbosity, option_progress);
 895
 896         path = get_repo_path(remote->url[0], &is_bundle);
 897         is_local = option_local != 0 && path && !is_bundle;
 898         if (is_local) {
 899                 if (option_depth)
 900                         warning(_("--depth is ignored in local clones; use file:// instead."));
 901                 if (!access(mkpath("%s/shallow", path), F_OK)) {
 902                         if (option_local > 0)
 903                                 warning(_("source repository is shallow, ignoring --local"));
 904                         is_local = 0;
 905                 }
 906         }
 907         if (option_local > 0 && !is_local)
 908                 warning(_("--local is ignored"));
 909         transport->cloning = 1;
 910
 911         if (!transport->get_refs_list || (!is_local && !transport->fetch))
 912                 die(_("Don't know how to clone %s"), transport->url);
 913
 914         transport_set_option(transport, TRANS_OPT_KEEP, "yes");
 915
 916         if (option_depth)
 917                 transport_set_option(transport, TRANS_OPT_DEPTH,
 918                                      option_depth);
 919         if (option_single_branch)
 920                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
 921
 922         if (option_upload_pack)
 923                 transport_set_option(transport, TRANS_OPT_UPLOADPACK,
 924                                      option_upload_pack);
 925
 926         if (transport->smart_options && !option_depth)
 927                 transport->smart_options->check_self_contained_and_connected = 1;
 928
 929         refs = transport_get_remote_refs(transport);
 930
 931         if (refs) {
 932                 mapped_refs = wanted_peer_refs(refs, refspec);
 933                 /*
 934                  * transport_get_remote_refs() may return refs with null sha-1
 935                  * in mapped_refs (see struct transport->get_refs_list
 936                  * comment). In that case we need fetch it early because
 937                  * remote_head code below relies on it.
 938                  *
 939                  * for normal clones, transport_get_remote_refs() should
 940                  * return reliable ref set, we can delay cloning until after
 941                  * remote HEAD check.
 942                  */
 943                 for (ref = refs; ref; ref = ref->next)
 944                         if (is_null_sha1(ref->old_sha1)) {
 945                                 complete_refs_before_fetch = 0;
 946                                 break;
 947                         }
 948
 949                 if (!is_local && !complete_refs_before_fetch)
 950                         transport_fetch_refs(transport, mapped_refs);
 951
 952                 remote_head = find_ref_by_name(refs, "HEAD");
 953                 remote_head_points_at =
 954                         guess_remote_head(remote_head, mapped_refs, 0);
 955
 956                 if (option_branch) {
 957                         our_head_points_at =
 958                                 find_remote_branch(mapped_refs, option_branch);
 959
 960                         if (!our_head_points_at)
 961                                 die(_("Remote branch %s not found in upstream %s"),
 962                                     option_branch, option_origin);
 963                 }
 964                 else
 965                         our_head_points_at = remote_head_points_at;
 966         }
 967         else {
 968                 if (option_branch)
 969                         die(_("Remote branch %s not found in upstream %s"),
 970                                         option_branch, option_origin);
 971
 972                 warning(_("You appear to have cloned an empty repository."));
 973                 mapped_refs = NULL;
 974                 our_head_points_at = NULL;
 975                 remote_head_points_at = NULL;
 976                 remote_head = NULL;
 977                 option_no_checkout = 1;
 978                 if (!option_bare)
 979                         install_branch_config(0, "master", option_origin,
 980                                               "refs/heads/master");
 981         }
 982
 983         write_refspec_config(src_ref_prefix, our_head_points_at,
 984                         remote_head_points_at, &branch_top);
 985
 986         if (is_local)
 987                 clone_local(path, git_dir);
 988         else if (refs && complete_refs_before_fetch)
 989                 transport_fetch_refs(transport, mapped_refs);
 990
 991         update_remote_refs(refs, mapped_refs, remote_head_points_at,
 992                            branch_top.buf, reflog_msg.buf, transport, !is_local);
 993
 994         update_head(our_head_points_at, remote_head, reflog_msg.buf);
 995
 996         transport_unlock_pack(transport);
 997         transport_disconnect(transport);
 998
 999         if (option_dissociate)
1000                 dissociate_from_references();
1001
1002         junk_mode = JUNK_LEAVE_REPO;
1003         err = checkout();
1004
1005         strbuf_release(&reflog_msg);
1006         strbuf_release(&branch_top);
1007         strbuf_release(&key);
1008         strbuf_release(&value);
1009         junk_mode = JUNK_LEAVE_ALL;
1010
1011         free(refspec);
1012         return err;
1013 }