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, abs_buf[PATH_MAX];
 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 = mkpath("%s/objects/%s", src_repo, line.buf);
 288                 normalize_path_copy(abs_buf, abs_path);
 289                 add_to_alternates_file(abs_buf);
 290         }
 291         strbuf_release(&line);
 292         fclose(in);
 293 }
 294
 295 static void copy_or_link_directory(struct strbuf *src, struct strbuf *dest,
 296                                    const char *src_repo, int src_baselen)
 297 {
 298         struct dirent *de;
 299         struct stat buf;
 300         int src_len, dest_len;
 301         DIR *dir;
 302
 303         dir = opendir(src->buf);
 304         if (!dir)
 305                 die_errno(_("failed to open '%s'"), src->buf);
 306
 307         if (mkdir(dest->buf, 0777)) {
 308                 if (errno != EEXIST)
 309                         die_errno(_("failed to create directory '%s'"), dest->buf);
 310                 else if (stat(dest->buf, &buf))
 311                         die_errno(_("failed to stat '%s'"), dest->buf);
 312                 else if (!S_ISDIR(buf.st_mode))
 313                         die(_("%s exists and is not a directory"), dest->buf);
 314         }
 315
 316         strbuf_addch(src, '/');
 317         src_len = src->len;
 318         strbuf_addch(dest, '/');
 319         dest_len = dest->len;
 320
 321         while ((de = readdir(dir)) != NULL) {
 322                 strbuf_setlen(src, src_len);
 323                 strbuf_addstr(src, de->d_name);
 324                 strbuf_setlen(dest, dest_len);
 325                 strbuf_addstr(dest, de->d_name);
 326                 if (stat(src->buf, &buf)) {
 327                         warning (_("failed to stat %s\n"), src->buf);
 328                         continue;
 329                 }
 330                 if (S_ISDIR(buf.st_mode)) {
 331                         if (de->d_name[0] != '.')
 332                                 copy_or_link_directory(src, dest,
 333                                                        src_repo, src_baselen);
 334                         continue;
 335                 }
 336
 337                 /* Files that cannot be copied bit-for-bit... */
 338                 if (!strcmp(src->buf + src_baselen, "/info/alternates")) {
 339                         copy_alternates(src, dest, src_repo);
 340                         continue;
 341                 }
 342
 343                 if (unlink(dest->buf) && errno != ENOENT)
 344                         die_errno(_("failed to unlink '%s'"), dest->buf);
 345                 if (!option_no_hardlinks) {
 346                         if (!link(src->buf, dest->buf))
 347                                 continue;
 348                         if (option_local > 0)
 349                                 die_errno(_("failed to create link '%s'"), dest->buf);
 350                         option_no_hardlinks = 1;
 351                 }
 352                 if (copy_file_with_time(dest->buf, src->buf, 0666))
 353                         die_errno(_("failed to copy file to '%s'"), dest->buf);
 354         }
 355         closedir(dir);
 356 }
 357
 358 static void clone_local(const char *src_repo, const char *dest_repo)
 359 {
 360         if (option_shared) {
 361                 struct strbuf alt = STRBUF_INIT;
 362                 strbuf_addf(&alt, "%s/objects", src_repo);
 363                 add_to_alternates_file(alt.buf);
 364                 strbuf_release(&alt);
 365         } else {
 366                 struct strbuf src = STRBUF_INIT;
 367                 struct strbuf dest = STRBUF_INIT;
 368                 strbuf_addf(&src, "%s/objects", src_repo);
 369                 strbuf_addf(&dest, "%s/objects", dest_repo);
 370                 copy_or_link_directory(&src, &dest, src_repo, src.len);
 371                 strbuf_release(&src);
 372                 strbuf_release(&dest);
 373         }
 374
 375         if (0 <= option_verbosity)
 376                 fprintf(stderr, _("done.\n"));
 377 }
 378
 379 static const char *junk_work_tree;
 380 static const char *junk_git_dir;
 381 static enum {
 382         JUNK_LEAVE_NONE,
 383         JUNK_LEAVE_REPO,
 384         JUNK_LEAVE_ALL
 385 } junk_mode = JUNK_LEAVE_NONE;
 386
 387 static const char junk_leave_repo_msg[] =
 388 N_("Clone succeeded, but checkout failed.\n"
 389    "You can inspect what was checked out with 'git status'\n"
 390    "and retry the checkout with 'git checkout -f HEAD'\n");
 391
 392 static void remove_junk(void)
 393 {
 394         struct strbuf sb = STRBUF_INIT;
 395
 396         switch (junk_mode) {
 397         case JUNK_LEAVE_REPO:
 398                 warning("%s", _(junk_leave_repo_msg));
 399                 /* fall-through */
 400         case JUNK_LEAVE_ALL:
 401                 return;
 402         default:
 403                 /* proceed to removal */
 404                 break;
 405         }
 406
 407         if (junk_git_dir) {
 408                 strbuf_addstr(&sb, junk_git_dir);
 409                 remove_dir_recursively(&sb, 0);
 410                 strbuf_reset(&sb);
 411         }
 412         if (junk_work_tree) {
 413                 strbuf_addstr(&sb, junk_work_tree);
 414                 remove_dir_recursively(&sb, 0);
 415                 strbuf_reset(&sb);
 416         }
 417 }
 418
 419 static void remove_junk_on_signal(int signo)
 420 {
 421         remove_junk();
 422         sigchain_pop(signo);
 423         raise(signo);
 424 }
 425
 426 static struct ref *find_remote_branch(const struct ref *refs, const char *branch)
 427 {
 428         struct ref *ref;
 429         struct strbuf head = STRBUF_INIT;
 430         strbuf_addstr(&head, "refs/heads/");
 431         strbuf_addstr(&head, branch);
 432         ref = find_ref_by_name(refs, head.buf);
 433         strbuf_release(&head);
 434
 435         if (ref)
 436                 return ref;
 437
 438         strbuf_addstr(&head, "refs/tags/");
 439         strbuf_addstr(&head, branch);
 440         ref = find_ref_by_name(refs, head.buf);
 441         strbuf_release(&head);
 442
 443         return ref;
 444 }
 445
 446 static struct ref *wanted_peer_refs(const struct ref *refs,
 447                 struct refspec *refspec)
 448 {
 449         struct ref *head = copy_ref(find_ref_by_name(refs, "HEAD"));
 450         struct ref *local_refs = head;
 451         struct ref **tail = head ? &head->next : &local_refs;
 452
 453         if (option_single_branch) {
 454                 struct ref *remote_head = NULL;
 455
 456                 if (!option_branch)
 457                         remote_head = guess_remote_head(head, refs, 0);
 458                 else {
 459                         local_refs = NULL;
 460                         tail = &local_refs;
 461                         remote_head = copy_ref(find_remote_branch(refs, option_branch));
 462                 }
 463
 464                 if (!remote_head && option_branch)
 465                         warning(_("Could not find remote branch %s to clone."),
 466                                 option_branch);
 467                 else {
 468                         get_fetch_map(remote_head, refspec, &tail, 0);
 469
 470                         /* if --branch=tag, pull the requested tag explicitly */
 471                         get_fetch_map(remote_head, tag_refspec, &tail, 0);
 472                 }
 473         } else
 474                 get_fetch_map(refs, refspec, &tail, 0);
 475
 476         if (!option_mirror && !option_single_branch)
 477                 get_fetch_map(refs, tag_refspec, &tail, 0);
 478
 479         return local_refs;
 480 }
 481
 482 static void write_remote_refs(const struct ref *local_refs)
 483 {
 484         const struct ref *r;
 485
 486         lock_packed_refs(LOCK_DIE_ON_ERROR);
 487
 488         for (r = local_refs; r; r = r->next) {
 489                 if (!r->peer_ref)
 490                         continue;
 491                 add_packed_ref(r->peer_ref->name, r->old_sha1);
 492         }
 493
 494         if (commit_packed_refs())
 495                 die_errno("unable to overwrite old ref-pack file");
 496 }
 497
 498 static void write_followtags(const struct ref *refs, const char *msg)
 499 {
 500         const struct ref *ref;
 501         for (ref = refs; ref; ref = ref->next) {
 502                 if (!starts_with(ref->name, "refs/tags/"))
 503                         continue;
 504                 if (ends_with(ref->name, "^{}"))
 505                         continue;
 506                 if (!has_sha1_file(ref->old_sha1))
 507                         continue;
 508                 update_ref(msg, ref->name, ref->old_sha1,
 509                            NULL, 0, UPDATE_REFS_DIE_ON_ERR);
 510         }
 511 }
 512
 513 static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
 514 {
 515         struct ref **rm = cb_data;
 516         struct ref *ref = *rm;
 517
 518         /*
 519          * Skip anything missing a peer_ref, which we are not
 520          * actually going to write a ref for.
 521          */
 522         while (ref && !ref->peer_ref)
 523                 ref = ref->next;
 524         /* Returning -1 notes "end of list" to the caller. */
 525         if (!ref)
 526                 return -1;
 527
 528         hashcpy(sha1, ref->old_sha1);
 529         *rm = ref->next;
 530         return 0;
 531 }
 532
 533 static void update_remote_refs(const struct ref *refs,
 534                                const struct ref *mapped_refs,
 535                                const struct ref *remote_head_points_at,
 536                                const char *branch_top,
 537                                const char *msg,
 538                                struct transport *transport,
 539                                int check_connectivity)
 540 {
 541         const struct ref *rm = mapped_refs;
 542
 543         if (check_connectivity) {
 544                 if (transport->progress)
 545                         fprintf(stderr, _("Checking connectivity... "));
 546                 if (check_everything_connected_with_transport(iterate_ref_map,
 547                                                               0, &rm, transport))
 548                         die(_("remote did not send all necessary objects"));
 549                 if (transport->progress)
 550                         fprintf(stderr, _("done.\n"));
 551         }
 552
 553         if (refs) {
 554                 write_remote_refs(mapped_refs);
 555                 if (option_single_branch)
 556                         write_followtags(refs, msg);
 557         }
 558
 559         if (remote_head_points_at && !option_bare) {
 560                 struct strbuf head_ref = STRBUF_INIT;
 561                 strbuf_addstr(&head_ref, branch_top);
 562                 strbuf_addstr(&head_ref, "HEAD");
 563                 create_symref(head_ref.buf,
 564                               remote_head_points_at->peer_ref->name,
 565                               msg);
 566         }
 567 }
 568
 569 static void update_head(const struct ref *our, const struct ref *remote,
 570                         const char *msg)
 571 {
 572         const char *head;
 573         if (our && skip_prefix(our->name, "refs/heads/", &head)) {
 574                 /* Local default branch link */
 575                 create_symref("HEAD", our->name, NULL);
 576                 if (!option_bare) {
 577                         update_ref(msg, "HEAD", our->old_sha1, NULL, 0,
 578                                    UPDATE_REFS_DIE_ON_ERR);
 579                         install_branch_config(0, head, option_origin, our->name);
 580                 }
 581         } else if (our) {
 582                 struct commit *c = lookup_commit_reference(our->old_sha1);
 583                 /* --branch specifies a non-branch (i.e. tags), detach HEAD */
 584                 update_ref(msg, "HEAD", c->object.sha1,
 585                            NULL, REF_NODEREF, UPDATE_REFS_DIE_ON_ERR);
 586         } else if (remote) {
 587                 /*
 588                  * We know remote HEAD points to a non-branch, or
 589                  * HEAD points to a branch but we don't know which one.
 590                  * Detach HEAD in all these cases.
 591                  */
 592                 update_ref(msg, "HEAD", remote->old_sha1,
 593                            NULL, REF_NODEREF, UPDATE_REFS_DIE_ON_ERR);
 594         }
 595 }
 596
 597 static int checkout(void)
 598 {
 599         unsigned char sha1[20];
 600         char *head;
 601         struct lock_file *lock_file;
 602         struct unpack_trees_options opts;
 603         struct tree *tree;
 604         struct tree_desc t;
 605         int err = 0;
 606
 607         if (option_no_checkout)
 608                 return 0;
 609
 610         head = resolve_refdup("HEAD", RESOLVE_REF_READING, sha1, NULL);
 611         if (!head) {
 612                 warning(_("remote HEAD refers to nonexistent ref, "
 613                           "unable to checkout.\n"));
 614                 return 0;
 615         }
 616         if (!strcmp(head, "HEAD")) {
 617                 if (advice_detached_head)
 618                         detach_advice(sha1_to_hex(sha1));
 619         } else {
 620                 if (!starts_with(head, "refs/heads/"))
 621                         die(_("HEAD not found below refs/heads!"));
 622         }
 623         free(head);
 624
 625         /* We need to be in the new work tree for the checkout */
 626         setup_work_tree();
 627
 628         lock_file = xcalloc(1, sizeof(struct lock_file));
 629         hold_locked_index(lock_file, 1);
 630
 631         memset(&opts, 0, sizeof opts);
 632         opts.update = 1;
 633         opts.merge = 1;
 634         opts.fn = oneway_merge;
 635         opts.verbose_update = (option_verbosity >= 0);
 636         opts.src_index = &the_index;
 637         opts.dst_index = &the_index;
 638
 639         tree = parse_tree_indirect(sha1);
 640         parse_tree(tree);
 641         init_tree_desc(&t, tree->buffer, tree->size);
 642         if (unpack_trees(1, &t, &opts) < 0)
 643                 die(_("unable to checkout working tree"));
 644
 645         if (write_locked_index(&the_index, lock_file, COMMIT_LOCK))
 646                 die(_("unable to write new index file"));
 647
 648         err |= run_hook_le(NULL, "post-checkout", sha1_to_hex(null_sha1),
 649                            sha1_to_hex(sha1), "1", NULL);
 650
 651         if (!err && option_recursive)
 652                 err = run_command_v_opt(argv_submodule, RUN_GIT_CMD);
 653
 654         return err;
 655 }
 656
 657 static int write_one_config(const char *key, const char *value, void *data)
 658 {
 659         return git_config_set_multivar(key, value ? value : "true", "^$", 0);
 660 }
 661
 662 static void write_config(struct string_list *config)
 663 {
 664         int i;
 665
 666         for (i = 0; i < config->nr; i++) {
 667                 if (git_config_parse_parameter(config->items[i].string,
 668                                                write_one_config, NULL) < 0)
 669                         die("unable to write parameters to config file");
 670         }
 671 }
 672
 673 static void write_refspec_config(const char *src_ref_prefix,
 674                 const struct ref *our_head_points_at,
 675                 const struct ref *remote_head_points_at,
 676                 struct strbuf *branch_top)
 677 {
 678         struct strbuf key = STRBUF_INIT;
 679         struct strbuf value = STRBUF_INIT;
 680
 681         if (option_mirror || !option_bare) {
 682                 if (option_single_branch && !option_mirror) {
 683                         if (option_branch) {
 684                                 if (starts_with(our_head_points_at->name, "refs/tags/"))
 685                                         strbuf_addf(&value, "+%s:%s", our_head_points_at->name,
 686                                                 our_head_points_at->name);
 687                                 else
 688                                         strbuf_addf(&value, "+%s:%s%s", our_head_points_at->name,
 689                                                 branch_top->buf, option_branch);
 690                         } else if (remote_head_points_at) {
 691                                 const char *head = remote_head_points_at->name;
 692                                 if (!skip_prefix(head, "refs/heads/", &head))
 693                                         die("BUG: remote HEAD points at non-head?");
 694
 695                                 strbuf_addf(&value, "+%s:%s%s", remote_head_points_at->name,
 696                                                 branch_top->buf, head);
 697                         }
 698                         /*
 699                          * otherwise, the next "git fetch" will
 700                          * simply fetch from HEAD without updating
 701                          * any remote-tracking branch, which is what
 702                          * we want.
 703                          */
 704                 } else {
 705                         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top->buf);
 706                 }
 707                 /* Configure the remote */
 708                 if (value.len) {
 709                         strbuf_addf(&key, "remote.%s.fetch", option_origin);
 710                         git_config_set_multivar(key.buf, value.buf, "^$", 0);
 711                         strbuf_reset(&key);
 712
 713                         if (option_mirror) {
 714                                 strbuf_addf(&key, "remote.%s.mirror", option_origin);
 715                                 git_config_set(key.buf, "true");
 716                                 strbuf_reset(&key);
 717                         }
 718                 }
 719         }
 720
 721         strbuf_release(&key);
 722         strbuf_release(&value);
 723 }
 724
 725 static void dissociate_from_references(void)
 726 {
 727         static const char* argv[] = { "repack", "-a", "-d", NULL };
 728
 729         if (run_command_v_opt(argv, RUN_GIT_CMD|RUN_COMMAND_NO_STDIN))
 730                 die(_("cannot repack to clean up"));
 731         if (unlink(git_path("objects/info/alternates")) && errno != ENOENT)
 732                 die_errno(_("cannot unlink temporary alternates file"));
 733 }
 734
 735 int cmd_clone(int argc, const char **argv, const char *prefix)
 736 {
 737         int is_bundle = 0, is_local;
 738         struct stat buf;
 739         const char *repo_name, *repo, *work_tree, *git_dir;
 740         char *path, *dir;
 741         int dest_exists;
 742         const struct ref *refs, *remote_head;
 743         const struct ref *remote_head_points_at;
 744         const struct ref *our_head_points_at;
 745         struct ref *mapped_refs;
 746         const struct ref *ref;
 747         struct strbuf key = STRBUF_INIT, value = STRBUF_INIT;
 748         struct strbuf branch_top = STRBUF_INIT, reflog_msg = STRBUF_INIT;
 749         struct transport *transport = NULL;
 750         const char *src_ref_prefix = "refs/heads/";
 751         struct remote *remote;
 752         int err = 0, complete_refs_before_fetch = 1;
 753
 754         struct refspec *refspec;
 755         const char *fetch_pattern;
 756
 757         packet_trace_identity("clone");
 758         argc = parse_options(argc, argv, prefix, builtin_clone_options,
 759                              builtin_clone_usage, 0);
 760
 761         if (argc > 2)
 762                 usage_msg_opt(_("Too many arguments."),
 763                         builtin_clone_usage, builtin_clone_options);
 764
 765         if (argc == 0)
 766                 usage_msg_opt(_("You must specify a repository to clone."),
 767                         builtin_clone_usage, builtin_clone_options);
 768
 769         if (option_single_branch == -1)
 770                 option_single_branch = option_depth ? 1 : 0;
 771
 772         if (option_mirror)
 773                 option_bare = 1;
 774
 775         if (option_bare) {
 776                 if (option_origin)
 777                         die(_("--bare and --origin %s options are incompatible."),
 778                             option_origin);
 779                 if (real_git_dir)
 780                         die(_("--bare and --separate-git-dir are incompatible."));
 781                 option_no_checkout = 1;
 782         }
 783
 784         if (!option_origin)
 785                 option_origin = "origin";
 786
 787         repo_name = argv[0];
 788
 789         path = get_repo_path(repo_name, &is_bundle);
 790         if (path)
 791                 repo = xstrdup(absolute_path(repo_name));
 792         else if (!strchr(repo_name, ':'))
 793                 die(_("repository '%s' does not exist"), repo_name);
 794         else
 795                 repo = repo_name;
 796
 797         /* no need to be strict, transport_set_option() will validate it again */
 798         if (option_depth && atoi(option_depth) < 1)
 799                 die(_("depth %s is not a positive number"), option_depth);
 800
 801         if (argc == 2)
 802                 dir = xstrdup(argv[1]);
 803         else
 804                 dir = guess_dir_name(repo_name, is_bundle, option_bare);
 805         strip_trailing_slashes(dir);
 806
 807         dest_exists = !stat(dir, &buf);
 808         if (dest_exists && !is_empty_dir(dir))
 809                 die(_("destination path '%s' already exists and is not "
 810                         "an empty directory."), dir);
 811
 812         strbuf_addf(&reflog_msg, "clone: from %s", repo);
 813
 814         if (option_bare)
 815                 work_tree = NULL;
 816         else {
 817                 work_tree = getenv("GIT_WORK_TREE");
 818                 if (work_tree && !stat(work_tree, &buf))
 819                         die(_("working tree '%s' already exists."), work_tree);
 820         }
 821
 822         if (option_bare || work_tree)
 823                 git_dir = xstrdup(dir);
 824         else {
 825                 work_tree = dir;
 826                 git_dir = mkpathdup("%s/.git", dir);
 827         }
 828
 829         atexit(remove_junk);
 830         sigchain_push_common(remove_junk_on_signal);
 831
 832         if (!option_bare) {
 833                 if (safe_create_leading_directories_const(work_tree) < 0)
 834                         die_errno(_("could not create leading directories of '%s'"),
 835                                   work_tree);
 836                 if (!dest_exists && mkdir(work_tree, 0777))
 837                         die_errno(_("could not create work tree dir '%s'"),
 838                                   work_tree);
 839                 junk_work_tree = work_tree;
 840                 set_git_work_tree(work_tree);
 841         }
 842
 843         junk_git_dir = git_dir;
 844         if (safe_create_leading_directories_const(git_dir) < 0)
 845                 die(_("could not create leading directories of '%s'"), git_dir);
 846
 847         set_git_dir_init(git_dir, real_git_dir, 0);
 848         if (real_git_dir) {
 849                 git_dir = real_git_dir;
 850                 junk_git_dir = real_git_dir;
 851         }
 852
 853         if (0 <= option_verbosity) {
 854                 if (option_bare)
 855                         fprintf(stderr, _("Cloning into bare repository '%s'...\n"), dir);
 856                 else
 857                         fprintf(stderr, _("Cloning into '%s'...\n"), dir);
 858         }
 859         init_db(option_template, INIT_DB_QUIET);
 860         write_config(&option_config);
 861
 862         git_config(git_default_config, NULL);
 863
 864         if (option_bare) {
 865                 if (option_mirror)
 866                         src_ref_prefix = "refs/";
 867                 strbuf_addstr(&branch_top, src_ref_prefix);
 868
 869                 git_config_set("core.bare", "true");
 870         } else {
 871                 strbuf_addf(&branch_top, "refs/remotes/%s/", option_origin);
 872         }
 873
 874         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top.buf);
 875         strbuf_addf(&key, "remote.%s.url", option_origin);
 876         git_config_set(key.buf, repo);
 877         strbuf_reset(&key);
 878
 879         if (option_reference.nr)
 880                 setup_reference();
 881         else if (option_dissociate) {
 882                 warning(_("--dissociate given, but there is no --reference"));
 883                 option_dissociate = 0;
 884         }
 885
 886         fetch_pattern = value.buf;
 887         refspec = parse_fetch_refspec(1, &fetch_pattern);
 888
 889         strbuf_reset(&value);
 890
 891         remote = remote_get(option_origin);
 892         transport = transport_get(remote, remote->url[0]);
 893         transport_set_verbosity(transport, option_verbosity, option_progress);
 894
 895         path = get_repo_path(remote->url[0], &is_bundle);
 896         is_local = option_local != 0 && path && !is_bundle;
 897         if (is_local) {
 898                 if (option_depth)
 899                         warning(_("--depth is ignored in local clones; use file:// instead."));
 900                 if (!access(mkpath("%s/shallow", path), F_OK)) {
 901                         if (option_local > 0)
 902                                 warning(_("source repository is shallow, ignoring --local"));
 903                         is_local = 0;
 904                 }
 905         }
 906         if (option_local > 0 && !is_local)
 907                 warning(_("--local is ignored"));
 908         transport->cloning = 1;
 909
 910         if (!transport->get_refs_list || (!is_local && !transport->fetch))
 911                 die(_("Don't know how to clone %s"), transport->url);
 912
 913         transport_set_option(transport, TRANS_OPT_KEEP, "yes");
 914
 915         if (option_depth)
 916                 transport_set_option(transport, TRANS_OPT_DEPTH,
 917                                      option_depth);
 918         if (option_single_branch)
 919                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
 920
 921         if (option_upload_pack)
 922                 transport_set_option(transport, TRANS_OPT_UPLOADPACK,
 923                                      option_upload_pack);
 924
 925         if (transport->smart_options && !option_depth)
 926                 transport->smart_options->check_self_contained_and_connected = 1;
 927
 928         refs = transport_get_remote_refs(transport);
 929
 930         if (refs) {
 931                 mapped_refs = wanted_peer_refs(refs, refspec);
 932                 /*
 933                  * transport_get_remote_refs() may return refs with null sha-1
 934                  * in mapped_refs (see struct transport->get_refs_list
 935                  * comment). In that case we need fetch it early because
 936                  * remote_head code below relies on it.
 937                  *
 938                  * for normal clones, transport_get_remote_refs() should
 939                  * return reliable ref set, we can delay cloning until after
 940                  * remote HEAD check.
 941                  */
 942                 for (ref = refs; ref; ref = ref->next)
 943                         if (is_null_sha1(ref->old_sha1)) {
 944                                 complete_refs_before_fetch = 0;
 945                                 break;
 946                         }
 947
 948                 if (!is_local && !complete_refs_before_fetch)
 949                         transport_fetch_refs(transport, mapped_refs);
 950
 951                 remote_head = find_ref_by_name(refs, "HEAD");
 952                 remote_head_points_at =
 953                         guess_remote_head(remote_head, mapped_refs, 0);
 954
 955                 if (option_branch) {
 956                         our_head_points_at =
 957                                 find_remote_branch(mapped_refs, option_branch);
 958
 959                         if (!our_head_points_at)
 960                                 die(_("Remote branch %s not found in upstream %s"),
 961                                     option_branch, option_origin);
 962                 }
 963                 else
 964                         our_head_points_at = remote_head_points_at;
 965         }
 966         else {
 967                 if (option_branch)
 968                         die(_("Remote branch %s not found in upstream %s"),
 969                                         option_branch, option_origin);
 970
 971                 warning(_("You appear to have cloned an empty repository."));
 972                 mapped_refs = NULL;
 973                 our_head_points_at = NULL;
 974                 remote_head_points_at = NULL;
 975                 remote_head = NULL;
 976                 option_no_checkout = 1;
 977                 if (!option_bare)
 978                         install_branch_config(0, "master", option_origin,
 979                                               "refs/heads/master");
 980         }
 981
 982         write_refspec_config(src_ref_prefix, our_head_points_at,
 983                         remote_head_points_at, &branch_top);
 984
 985         if (is_local)
 986                 clone_local(path, git_dir);
 987         else if (refs && complete_refs_before_fetch)
 988                 transport_fetch_refs(transport, mapped_refs);
 989
 990         update_remote_refs(refs, mapped_refs, remote_head_points_at,
 991                            branch_top.buf, reflog_msg.buf, transport, !is_local);
 992
 993         update_head(our_head_points_at, remote_head, reflog_msg.buf);
 994
 995         transport_unlock_pack(transport);
 996         transport_disconnect(transport);
 997
 998         if (option_dissociate)
 999                 dissociate_from_references();
1000
1001         junk_mode = JUNK_LEAVE_REPO;
1002         err = checkout();
1003
1004         strbuf_release(&reflog_msg);
1005         strbuf_release(&branch_top);
1006         strbuf_release(&key);
1007         strbuf_release(&value);
1008         junk_mode = JUNK_LEAVE_ALL;
1009
1010         free(refspec);
1011         return err;
1012 }