builtin / clone.con commit Merge branch 'km/fetch-do-not-free-remote-name' (845351c)
   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 */
  36static const char * const builtin_clone_usage[] = {
  37        N_("git clone [<options>] [--] <repo> [<dir>]"),
  38        NULL
  39};
  40
  41static int option_no_checkout, option_bare, option_mirror, option_single_branch = -1;
  42static int option_local = -1, option_no_hardlinks, option_shared, option_recursive;
  43static int option_shallow_submodules = -1;
  44static char *option_template, *option_depth;
  45static char *option_origin = NULL;
  46static char *option_branch = NULL;
  47static const char *real_git_dir;
  48static char *option_upload_pack = "git-upload-pack";
  49static int option_verbosity;
  50static int option_progress = -1;
  51static enum transport_family family;
  52static struct string_list option_config = STRING_LIST_INIT_NODUP;
  53static struct string_list option_reference = STRING_LIST_INIT_NODUP;
  54static int option_dissociate;
  55static int max_jobs = -1;
  56
  57static struct option builtin_clone_options[] = {
  58        OPT__VERBOSITY(&option_verbosity),
  59        OPT_BOOL(0, "progress", &option_progress,
  60                 N_("force progress reporting")),
  61        OPT_BOOL('n', "no-checkout", &option_no_checkout,
  62                 N_("don't create a checkout")),
  63        OPT_BOOL(0, "bare", &option_bare, N_("create a bare repository")),
  64        OPT_HIDDEN_BOOL(0, "naked", &option_bare,
  65                        N_("create a bare repository")),
  66        OPT_BOOL(0, "mirror", &option_mirror,
  67                 N_("create a mirror repository (implies bare)")),
  68        OPT_BOOL('l', "local", &option_local,
  69                N_("to clone from a local repository")),
  70        OPT_BOOL(0, "no-hardlinks", &option_no_hardlinks,
  71                    N_("don't use local hardlinks, always copy")),
  72        OPT_BOOL('s', "shared", &option_shared,
  73                    N_("setup as shared repository")),
  74        OPT_BOOL(0, "recursive", &option_recursive,
  75                    N_("initialize submodules in the clone")),
  76        OPT_BOOL(0, "recurse-submodules", &option_recursive,
  77                    N_("initialize submodules in the clone")),
  78        OPT_INTEGER('j', "jobs", &max_jobs,
  79                    N_("number of submodules cloned in parallel")),
  80        OPT_STRING(0, "template", &option_template, N_("template-directory"),
  81                   N_("directory from which templates will be used")),
  82        OPT_STRING_LIST(0, "reference", &option_reference, N_("repo"),
  83                        N_("reference repository")),
  84        OPT_BOOL(0, "dissociate", &option_dissociate,
  85                 N_("use --reference only while cloning")),
  86        OPT_STRING('o', "origin", &option_origin, N_("name"),
  87                   N_("use <name> instead of 'origin' to track upstream")),
  88        OPT_STRING('b', "branch", &option_branch, N_("branch"),
  89                   N_("checkout <branch> instead of the remote's HEAD")),
  90        OPT_STRING('u', "upload-pack", &option_upload_pack, N_("path"),
  91                   N_("path to git-upload-pack on the remote")),
  92        OPT_STRING(0, "depth", &option_depth, N_("depth"),
  93                    N_("create a shallow clone of that depth")),
  94        OPT_BOOL(0, "single-branch", &option_single_branch,
  95                    N_("clone only one branch, HEAD or --branch")),
  96        OPT_BOOL(0, "shallow-submodules", &option_shallow_submodules,
  97                    N_("any cloned submodules will be shallow")),
  98        OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
  99                   N_("separate git dir from working tree")),
 100        OPT_STRING_LIST('c', "config", &option_config, N_("key=value"),
 101                        N_("set config inside the new repository")),
 102        OPT_SET_INT('4', "ipv4", &family, N_("use IPv4 addresses only"),
 103                        TRANSPORT_FAMILY_IPV4),
 104        OPT_SET_INT('6', "ipv6", &family, N_("use IPv6 addresses only"),
 105                        TRANSPORT_FAMILY_IPV6),
 106        OPT_END()
 107};
 108
 109static const char *get_repo_path_1(struct strbuf *path, int *is_bundle)
 110{
 111        static char *suffix[] = { "/.git", "", ".git/.git", ".git" };
 112        static char *bundle_suffix[] = { ".bundle", "" };
 113        size_t baselen = path->len;
 114        struct stat st;
 115        int i;
 116
 117        for (i = 0; i < ARRAY_SIZE(suffix); i++) {
 118                strbuf_setlen(path, baselen);
 119                strbuf_addstr(path, suffix[i]);
 120                if (stat(path->buf, &st))
 121                        continue;
 122                if (S_ISDIR(st.st_mode) && is_git_directory(path->buf)) {
 123                        *is_bundle = 0;
 124                        return path->buf;
 125                } else if (S_ISREG(st.st_mode) && st.st_size > 8) {
 126                        /* Is it a "gitfile"? */
 127                        char signature[8];
 128                        const char *dst;
 129                        int len, fd = open(path->buf, O_RDONLY);
 130                        if (fd < 0)
 131                                continue;
 132                        len = read_in_full(fd, signature, 8);
 133                        close(fd);
 134                        if (len != 8 || strncmp(signature, "gitdir: ", 8))
 135                                continue;
 136                        dst = read_gitfile(path->buf);
 137                        if (dst) {
 138                                *is_bundle = 0;
 139                                return dst;
 140                        }
 141                }
 142        }
 143
 144        for (i = 0; i < ARRAY_SIZE(bundle_suffix); i++) {
 145                strbuf_setlen(path, baselen);
 146                strbuf_addstr(path, bundle_suffix[i]);
 147                if (!stat(path->buf, &st) && S_ISREG(st.st_mode)) {
 148                        *is_bundle = 1;
 149                        return path->buf;
 150                }
 151        }
 152
 153        return NULL;
 154}
 155
 156static char *get_repo_path(const char *repo, int *is_bundle)
 157{
 158        struct strbuf path = STRBUF_INIT;
 159        const char *raw;
 160        char *canon;
 161
 162        strbuf_addstr(&path, repo);
 163        raw = get_repo_path_1(&path, is_bundle);
 164        canon = raw ? xstrdup(absolute_path(raw)) : NULL;
 165        strbuf_release(&path);
 166        return canon;
 167}
 168
 169static char *guess_dir_name(const char *repo, int is_bundle, int is_bare)
 170{
 171        const char *end = repo + strlen(repo), *start, *ptr;
 172        size_t len;
 173        char *dir;
 174
 175        /*
 176         * Skip scheme.
 177         */
 178        start = strstr(repo, "://");
 179        if (start == NULL)
 180                start = repo;
 181        else
 182                start += 3;
 183
 184        /*
 185         * Skip authentication data. The stripping does happen
 186         * greedily, such that we strip up to the last '@' inside
 187         * the host part.
 188         */
 189        for (ptr = start; ptr < end && !is_dir_sep(*ptr); ptr++) {
 190                if (*ptr == '@')
 191                        start = ptr + 1;
 192        }
 193
 194        /*
 195         * Strip trailing spaces, slashes and /.git
 196         */
 197        while (start < end && (is_dir_sep(end[-1]) || isspace(end[-1])))
 198                end--;
 199        if (end - start > 5 && is_dir_sep(end[-5]) &&
 200            !strncmp(end - 4, ".git", 4)) {
 201                end -= 5;
 202                while (start < end && is_dir_sep(end[-1]))
 203                        end--;
 204        }
 205
 206        /*
 207         * Strip trailing port number if we've got only a
 208         * hostname (that is, there is no dir separator but a
 209         * colon). This check is required such that we do not
 210         * strip URI's like '/foo/bar:2222.git', which should
 211         * result in a dir '2222' being guessed due to backwards
 212         * compatibility.
 213         */
 214        if (memchr(start, '/', end - start) == NULL
 215            && memchr(start, ':', end - start) != NULL) {
 216                ptr = end;
 217                while (start < ptr && isdigit(ptr[-1]) && ptr[-1] != ':')
 218                        ptr--;
 219                if (start < ptr && ptr[-1] == ':')
 220                        end = ptr - 1;
 221        }
 222
 223        /*
 224         * Find last component. To remain backwards compatible we
 225         * also regard colons as path separators, such that
 226         * cloning a repository 'foo:bar.git' would result in a
 227         * directory 'bar' being guessed.
 228         */
 229        ptr = end;
 230        while (start < ptr && !is_dir_sep(ptr[-1]) && ptr[-1] != ':')
 231                ptr--;
 232        start = ptr;
 233
 234        /*
 235         * Strip .{bundle,git}.
 236         */
 237        len = end - start;
 238        strip_suffix_mem(start, &len, is_bundle ? ".bundle" : ".git");
 239
 240        if (!len || (len == 1 && *start == '/'))
 241                die(_("No directory name could be guessed.\n"
 242                      "Please specify a directory on the command line"));
 243
 244        if (is_bare)
 245                dir = xstrfmt("%.*s.git", (int)len, start);
 246        else
 247                dir = xstrndup(start, len);
 248        /*
 249         * Replace sequences of 'control' characters and whitespace
 250         * with one ascii space, remove leading and trailing spaces.
 251         */
 252        if (*dir) {
 253                char *out = dir;
 254                int prev_space = 1 /* strip leading whitespace */;
 255                for (end = dir; *end; ++end) {
 256                        char ch = *end;
 257                        if ((unsigned char)ch < '\x20')
 258                                ch = '\x20';
 259                        if (isspace(ch)) {
 260                                if (prev_space)
 261                                        continue;
 262                                prev_space = 1;
 263                        } else
 264                                prev_space = 0;
 265                        *out++ = ch;
 266                }
 267                *out = '\0';
 268                if (out > dir && prev_space)
 269                        out[-1] = '\0';
 270        }
 271        return dir;
 272}
 273
 274static void strip_trailing_slashes(char *dir)
 275{
 276        char *end = dir + strlen(dir);
 277
 278        while (dir < end - 1 && is_dir_sep(end[-1]))
 279                end--;
 280        *end = '\0';
 281}
 282
 283static int add_one_reference(struct string_list_item *item, void *cb_data)
 284{
 285        char *ref_git;
 286        const char *repo;
 287        struct strbuf alternate = STRBUF_INIT;
 288
 289        /* Beware: read_gitfile(), real_path() and mkpath() return static buffer */
 290        ref_git = xstrdup(real_path(item->string));
 291
 292        repo = read_gitfile(ref_git);
 293        if (!repo)
 294                repo = read_gitfile(mkpath("%s/.git", ref_git));
 295        if (repo) {
 296                free(ref_git);
 297                ref_git = xstrdup(repo);
 298        }
 299
 300        if (!repo && is_directory(mkpath("%s/.git/objects", ref_git))) {
 301                char *ref_git_git = mkpathdup("%s/.git", ref_git);
 302                free(ref_git);
 303                ref_git = ref_git_git;
 304        } else if (!is_directory(mkpath("%s/objects", ref_git))) {
 305                struct strbuf sb = STRBUF_INIT;
 306                if (get_common_dir(&sb, ref_git))
 307                        die(_("reference repository '%s' as a linked checkout is not supported yet."),
 308                            item->string);
 309                die(_("reference repository '%s' is not a local repository."),
 310                    item->string);
 311        }
 312
 313        if (!access(mkpath("%s/shallow", ref_git), F_OK))
 314                die(_("reference repository '%s' is shallow"), item->string);
 315
 316        if (!access(mkpath("%s/info/grafts", ref_git), F_OK))
 317                die(_("reference repository '%s' is grafted"), item->string);
 318
 319        strbuf_addf(&alternate, "%s/objects", ref_git);
 320        add_to_alternates_file(alternate.buf);
 321        strbuf_release(&alternate);
 322        free(ref_git);
 323        return 0;
 324}
 325
 326static void setup_reference(void)
 327{
 328        for_each_string_list(&option_reference, add_one_reference, NULL);
 329}
 330
 331static void copy_alternates(struct strbuf *src, struct strbuf *dst,
 332                            const char *src_repo)
 333{
 334        /*
 335         * Read from the source objects/info/alternates file
 336         * and copy the entries to corresponding file in the
 337         * destination repository with add_to_alternates_file().
 338         * Both src and dst have "$path/objects/info/alternates".
 339         *
 340         * Instead of copying bit-for-bit from the original,
 341         * we need to append to existing one so that the already
 342         * created entry via "clone -s" is not lost, and also
 343         * to turn entries with paths relative to the original
 344         * absolute, so that they can be used in the new repository.
 345         */
 346        FILE *in = fopen(src->buf, "r");
 347        struct strbuf line = STRBUF_INIT;
 348
 349        while (strbuf_getline(&line, in) != EOF) {
 350                char *abs_path;
 351                if (!line.len || line.buf[0] == '#')
 352                        continue;
 353                if (is_absolute_path(line.buf)) {
 354                        add_to_alternates_file(line.buf);
 355                        continue;
 356                }
 357                abs_path = mkpathdup("%s/objects/%s", src_repo, line.buf);
 358                normalize_path_copy(abs_path, abs_path);
 359                add_to_alternates_file(abs_path);
 360                free(abs_path);
 361        }
 362        strbuf_release(&line);
 363        fclose(in);
 364}
 365
 366static void copy_or_link_directory(struct strbuf *src, struct strbuf *dest,
 367                                   const char *src_repo, int src_baselen)
 368{
 369        struct dirent *de;
 370        struct stat buf;
 371        int src_len, dest_len;
 372        DIR *dir;
 373
 374        dir = opendir(src->buf);
 375        if (!dir)
 376                die_errno(_("failed to open '%s'"), src->buf);
 377
 378        if (mkdir(dest->buf, 0777)) {
 379                if (errno != EEXIST)
 380                        die_errno(_("failed to create directory '%s'"), dest->buf);
 381                else if (stat(dest->buf, &buf))
 382                        die_errno(_("failed to stat '%s'"), dest->buf);
 383                else if (!S_ISDIR(buf.st_mode))
 384                        die(_("%s exists and is not a directory"), dest->buf);
 385        }
 386
 387        strbuf_addch(src, '/');
 388        src_len = src->len;
 389        strbuf_addch(dest, '/');
 390        dest_len = dest->len;
 391
 392        while ((de = readdir(dir)) != NULL) {
 393                strbuf_setlen(src, src_len);
 394                strbuf_addstr(src, de->d_name);
 395                strbuf_setlen(dest, dest_len);
 396                strbuf_addstr(dest, de->d_name);
 397                if (stat(src->buf, &buf)) {
 398                        warning (_("failed to stat %s\n"), src->buf);
 399                        continue;
 400                }
 401                if (S_ISDIR(buf.st_mode)) {
 402                        if (de->d_name[0] != '.')
 403                                copy_or_link_directory(src, dest,
 404                                                       src_repo, src_baselen);
 405                        continue;
 406                }
 407
 408                /* Files that cannot be copied bit-for-bit... */
 409                if (!strcmp(src->buf + src_baselen, "/info/alternates")) {
 410                        copy_alternates(src, dest, src_repo);
 411                        continue;
 412                }
 413
 414                if (unlink(dest->buf) && errno != ENOENT)
 415                        die_errno(_("failed to unlink '%s'"), dest->buf);
 416                if (!option_no_hardlinks) {
 417                        if (!link(src->buf, dest->buf))
 418                                continue;
 419                        if (option_local > 0)
 420                                die_errno(_("failed to create link '%s'"), dest->buf);
 421                        option_no_hardlinks = 1;
 422                }
 423                if (copy_file_with_time(dest->buf, src->buf, 0666))
 424                        die_errno(_("failed to copy file to '%s'"), dest->buf);
 425        }
 426        closedir(dir);
 427}
 428
 429static void clone_local(const char *src_repo, const char *dest_repo)
 430{
 431        if (option_shared) {
 432                struct strbuf alt = STRBUF_INIT;
 433                strbuf_addf(&alt, "%s/objects", src_repo);
 434                add_to_alternates_file(alt.buf);
 435                strbuf_release(&alt);
 436        } else {
 437                struct strbuf src = STRBUF_INIT;
 438                struct strbuf dest = STRBUF_INIT;
 439                get_common_dir(&src, src_repo);
 440                get_common_dir(&dest, dest_repo);
 441                strbuf_addstr(&src, "/objects");
 442                strbuf_addstr(&dest, "/objects");
 443                copy_or_link_directory(&src, &dest, src_repo, src.len);
 444                strbuf_release(&src);
 445                strbuf_release(&dest);
 446        }
 447
 448        if (0 <= option_verbosity)
 449                fprintf(stderr, _("done.\n"));
 450}
 451
 452static const char *junk_work_tree;
 453static const char *junk_git_dir;
 454static enum {
 455        JUNK_LEAVE_NONE,
 456        JUNK_LEAVE_REPO,
 457        JUNK_LEAVE_ALL
 458} junk_mode = JUNK_LEAVE_NONE;
 459
 460static const char junk_leave_repo_msg[] =
 461N_("Clone succeeded, but checkout failed.\n"
 462   "You can inspect what was checked out with 'git status'\n"
 463   "and retry the checkout with 'git checkout -f HEAD'\n");
 464
 465static void remove_junk(void)
 466{
 467        struct strbuf sb = STRBUF_INIT;
 468
 469        switch (junk_mode) {
 470        case JUNK_LEAVE_REPO:
 471                warning("%s", _(junk_leave_repo_msg));
 472                /* fall-through */
 473        case JUNK_LEAVE_ALL:
 474                return;
 475        default:
 476                /* proceed to removal */
 477                break;
 478        }
 479
 480        if (junk_git_dir) {
 481                strbuf_addstr(&sb, junk_git_dir);
 482                remove_dir_recursively(&sb, 0);
 483                strbuf_reset(&sb);
 484        }
 485        if (junk_work_tree) {
 486                strbuf_addstr(&sb, junk_work_tree);
 487                remove_dir_recursively(&sb, 0);
 488                strbuf_reset(&sb);
 489        }
 490}
 491
 492static void remove_junk_on_signal(int signo)
 493{
 494        remove_junk();
 495        sigchain_pop(signo);
 496        raise(signo);
 497}
 498
 499static struct ref *find_remote_branch(const struct ref *refs, const char *branch)
 500{
 501        struct ref *ref;
 502        struct strbuf head = STRBUF_INIT;
 503        strbuf_addstr(&head, "refs/heads/");
 504        strbuf_addstr(&head, branch);
 505        ref = find_ref_by_name(refs, head.buf);
 506        strbuf_release(&head);
 507
 508        if (ref)
 509                return ref;
 510
 511        strbuf_addstr(&head, "refs/tags/");
 512        strbuf_addstr(&head, branch);
 513        ref = find_ref_by_name(refs, head.buf);
 514        strbuf_release(&head);
 515
 516        return ref;
 517}
 518
 519static struct ref *wanted_peer_refs(const struct ref *refs,
 520                struct refspec *refspec)
 521{
 522        struct ref *head = copy_ref(find_ref_by_name(refs, "HEAD"));
 523        struct ref *local_refs = head;
 524        struct ref **tail = head ? &head->next : &local_refs;
 525
 526        if (option_single_branch) {
 527                struct ref *remote_head = NULL;
 528
 529                if (!option_branch)
 530                        remote_head = guess_remote_head(head, refs, 0);
 531                else {
 532                        local_refs = NULL;
 533                        tail = &local_refs;
 534                        remote_head = copy_ref(find_remote_branch(refs, option_branch));
 535                }
 536
 537                if (!remote_head && option_branch)
 538                        warning(_("Could not find remote branch %s to clone."),
 539                                option_branch);
 540                else {
 541                        get_fetch_map(remote_head, refspec, &tail, 0);
 542
 543                        /* if --branch=tag, pull the requested tag explicitly */
 544                        get_fetch_map(remote_head, tag_refspec, &tail, 0);
 545                }
 546        } else
 547                get_fetch_map(refs, refspec, &tail, 0);
 548
 549        if (!option_mirror && !option_single_branch)
 550                get_fetch_map(refs, tag_refspec, &tail, 0);
 551
 552        return local_refs;
 553}
 554
 555static void write_remote_refs(const struct ref *local_refs)
 556{
 557        const struct ref *r;
 558
 559        struct ref_transaction *t;
 560        struct strbuf err = STRBUF_INIT;
 561
 562        t = ref_transaction_begin(&err);
 563        if (!t)
 564                die("%s", err.buf);
 565
 566        for (r = local_refs; r; r = r->next) {
 567                if (!r->peer_ref)
 568                        continue;
 569                if (ref_transaction_create(t, r->peer_ref->name, r->old_oid.hash,
 570                                           0, NULL, &err))
 571                        die("%s", err.buf);
 572        }
 573
 574        if (initial_ref_transaction_commit(t, &err))
 575                die("%s", err.buf);
 576
 577        strbuf_release(&err);
 578        ref_transaction_free(t);
 579}
 580
 581static void write_followtags(const struct ref *refs, const char *msg)
 582{
 583        const struct ref *ref;
 584        for (ref = refs; ref; ref = ref->next) {
 585                if (!starts_with(ref->name, "refs/tags/"))
 586                        continue;
 587                if (ends_with(ref->name, "^{}"))
 588                        continue;
 589                if (!has_object_file(&ref->old_oid))
 590                        continue;
 591                update_ref(msg, ref->name, ref->old_oid.hash,
 592                           NULL, 0, UPDATE_REFS_DIE_ON_ERR);
 593        }
 594}
 595
 596static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
 597{
 598        struct ref **rm = cb_data;
 599        struct ref *ref = *rm;
 600
 601        /*
 602         * Skip anything missing a peer_ref, which we are not
 603         * actually going to write a ref for.
 604         */
 605        while (ref && !ref->peer_ref)
 606                ref = ref->next;
 607        /* Returning -1 notes "end of list" to the caller. */
 608        if (!ref)
 609                return -1;
 610
 611        hashcpy(sha1, ref->old_oid.hash);
 612        *rm = ref->next;
 613        return 0;
 614}
 615
 616static void update_remote_refs(const struct ref *refs,
 617                               const struct ref *mapped_refs,
 618                               const struct ref *remote_head_points_at,
 619                               const char *branch_top,
 620                               const char *msg,
 621                               struct transport *transport,
 622                               int check_connectivity)
 623{
 624        const struct ref *rm = mapped_refs;
 625
 626        if (check_connectivity) {
 627                if (transport->progress)
 628                        fprintf(stderr, _("Checking connectivity... "));
 629                if (check_everything_connected_with_transport(iterate_ref_map,
 630                                                              0, &rm, transport))
 631                        die(_("remote did not send all necessary objects"));
 632                if (transport->progress)
 633                        fprintf(stderr, _("done.\n"));
 634        }
 635
 636        if (refs) {
 637                write_remote_refs(mapped_refs);
 638                if (option_single_branch)
 639                        write_followtags(refs, msg);
 640        }
 641
 642        if (remote_head_points_at && !option_bare) {
 643                struct strbuf head_ref = STRBUF_INIT;
 644                strbuf_addstr(&head_ref, branch_top);
 645                strbuf_addstr(&head_ref, "HEAD");
 646                if (create_symref(head_ref.buf,
 647                                  remote_head_points_at->peer_ref->name,
 648                                  msg) < 0)
 649                        die(_("unable to update %s"), head_ref.buf);
 650                strbuf_release(&head_ref);
 651        }
 652}
 653
 654static void update_head(const struct ref *our, const struct ref *remote,
 655                        const char *msg)
 656{
 657        const char *head;
 658        if (our && skip_prefix(our->name, "refs/heads/", &head)) {
 659                /* Local default branch link */
 660                if (create_symref("HEAD", our->name, NULL) < 0)
 661                        die(_("unable to update HEAD"));
 662                if (!option_bare) {
 663                        update_ref(msg, "HEAD", our->old_oid.hash, NULL, 0,
 664                                   UPDATE_REFS_DIE_ON_ERR);
 665                        install_branch_config(0, head, option_origin, our->name);
 666                }
 667        } else if (our) {
 668                struct commit *c = lookup_commit_reference(our->old_oid.hash);
 669                /* --branch specifies a non-branch (i.e. tags), detach HEAD */
 670                update_ref(msg, "HEAD", c->object.oid.hash,
 671                           NULL, REF_NODEREF, UPDATE_REFS_DIE_ON_ERR);
 672        } else if (remote) {
 673                /*
 674                 * We know remote HEAD points to a non-branch, or
 675                 * HEAD points to a branch but we don't know which one.
 676                 * Detach HEAD in all these cases.
 677                 */
 678                update_ref(msg, "HEAD", remote->old_oid.hash,
 679                           NULL, REF_NODEREF, UPDATE_REFS_DIE_ON_ERR);
 680        }
 681}
 682
 683static int checkout(void)
 684{
 685        unsigned char sha1[20];
 686        char *head;
 687        struct lock_file *lock_file;
 688        struct unpack_trees_options opts;
 689        struct tree *tree;
 690        struct tree_desc t;
 691        int err = 0;
 692
 693        if (option_no_checkout)
 694                return 0;
 695
 696        head = resolve_refdup("HEAD", RESOLVE_REF_READING, sha1, NULL);
 697        if (!head) {
 698                warning(_("remote HEAD refers to nonexistent ref, "
 699                          "unable to checkout.\n"));
 700                return 0;
 701        }
 702        if (!strcmp(head, "HEAD")) {
 703                if (advice_detached_head)
 704                        detach_advice(sha1_to_hex(sha1));
 705        } else {
 706                if (!starts_with(head, "refs/heads/"))
 707                        die(_("HEAD not found below refs/heads!"));
 708        }
 709        free(head);
 710
 711        /* We need to be in the new work tree for the checkout */
 712        setup_work_tree();
 713
 714        lock_file = xcalloc(1, sizeof(struct lock_file));
 715        hold_locked_index(lock_file, 1);
 716
 717        memset(&opts, 0, sizeof opts);
 718        opts.update = 1;
 719        opts.merge = 1;
 720        opts.fn = oneway_merge;
 721        opts.verbose_update = (option_verbosity >= 0);
 722        opts.src_index = &the_index;
 723        opts.dst_index = &the_index;
 724
 725        tree = parse_tree_indirect(sha1);
 726        parse_tree(tree);
 727        init_tree_desc(&t, tree->buffer, tree->size);
 728        if (unpack_trees(1, &t, &opts) < 0)
 729                die(_("unable to checkout working tree"));
 730
 731        if (write_locked_index(&the_index, lock_file, COMMIT_LOCK))
 732                die(_("unable to write new index file"));
 733
 734        err |= run_hook_le(NULL, "post-checkout", sha1_to_hex(null_sha1),
 735                           sha1_to_hex(sha1), "1", NULL);
 736
 737        if (!err && option_recursive) {
 738                struct argv_array args = ARGV_ARRAY_INIT;
 739                argv_array_pushl(&args, "submodule", "update", "--init", "--recursive", NULL);
 740
 741                if (option_shallow_submodules == 1
 742                    || (option_shallow_submodules == -1 && option_depth))
 743                        argv_array_push(&args, "--depth=1");
 744
 745                if (max_jobs != -1)
 746                        argv_array_pushf(&args, "--jobs=%d", max_jobs);
 747
 748                err = run_command_v_opt(args.argv, RUN_GIT_CMD);
 749                argv_array_clear(&args);
 750        }
 751
 752        return err;
 753}
 754
 755static int write_one_config(const char *key, const char *value, void *data)
 756{
 757        return git_config_set_multivar_gently(key, value ? value : "true", "^$", 0);
 758}
 759
 760static void write_config(struct string_list *config)
 761{
 762        int i;
 763
 764        for (i = 0; i < config->nr; i++) {
 765                if (git_config_parse_parameter(config->items[i].string,
 766                                               write_one_config, NULL) < 0)
 767                        die(_("unable to write parameters to config file"));
 768        }
 769}
 770
 771static void write_refspec_config(const char *src_ref_prefix,
 772                const struct ref *our_head_points_at,
 773                const struct ref *remote_head_points_at,
 774                struct strbuf *branch_top)
 775{
 776        struct strbuf key = STRBUF_INIT;
 777        struct strbuf value = STRBUF_INIT;
 778
 779        if (option_mirror || !option_bare) {
 780                if (option_single_branch && !option_mirror) {
 781                        if (option_branch) {
 782                                if (starts_with(our_head_points_at->name, "refs/tags/"))
 783                                        strbuf_addf(&value, "+%s:%s", our_head_points_at->name,
 784                                                our_head_points_at->name);
 785                                else
 786                                        strbuf_addf(&value, "+%s:%s%s", our_head_points_at->name,
 787                                                branch_top->buf, option_branch);
 788                        } else if (remote_head_points_at) {
 789                                const char *head = remote_head_points_at->name;
 790                                if (!skip_prefix(head, "refs/heads/", &head))
 791                                        die("BUG: remote HEAD points at non-head?");
 792
 793                                strbuf_addf(&value, "+%s:%s%s", remote_head_points_at->name,
 794                                                branch_top->buf, head);
 795                        }
 796                        /*
 797                         * otherwise, the next "git fetch" will
 798                         * simply fetch from HEAD without updating
 799                         * any remote-tracking branch, which is what
 800                         * we want.
 801                         */
 802                } else {
 803                        strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top->buf);
 804                }
 805                /* Configure the remote */
 806                if (value.len) {
 807                        strbuf_addf(&key, "remote.%s.fetch", option_origin);
 808                        git_config_set_multivar(key.buf, value.buf, "^$", 0);
 809                        strbuf_reset(&key);
 810
 811                        if (option_mirror) {
 812                                strbuf_addf(&key, "remote.%s.mirror", option_origin);
 813                                git_config_set(key.buf, "true");
 814                                strbuf_reset(&key);
 815                        }
 816                }
 817        }
 818
 819        strbuf_release(&key);
 820        strbuf_release(&value);
 821}
 822
 823static void dissociate_from_references(void)
 824{
 825        static const char* argv[] = { "repack", "-a", "-d", NULL };
 826        char *alternates = git_pathdup("objects/info/alternates");
 827
 828        if (!access(alternates, F_OK)) {
 829                if (run_command_v_opt(argv, RUN_GIT_CMD|RUN_COMMAND_NO_STDIN))
 830                        die(_("cannot repack to clean up"));
 831                if (unlink(alternates) && errno != ENOENT)
 832                        die_errno(_("cannot unlink temporary alternates file"));
 833        }
 834        free(alternates);
 835}
 836
 837int cmd_clone(int argc, const char **argv, const char *prefix)
 838{
 839        int is_bundle = 0, is_local;
 840        struct stat buf;
 841        const char *repo_name, *repo, *work_tree, *git_dir;
 842        char *path, *dir;
 843        int dest_exists;
 844        const struct ref *refs, *remote_head;
 845        const struct ref *remote_head_points_at;
 846        const struct ref *our_head_points_at;
 847        struct ref *mapped_refs;
 848        const struct ref *ref;
 849        struct strbuf key = STRBUF_INIT, value = STRBUF_INIT;
 850        struct strbuf branch_top = STRBUF_INIT, reflog_msg = STRBUF_INIT;
 851        struct transport *transport = NULL;
 852        const char *src_ref_prefix = "refs/heads/";
 853        struct remote *remote;
 854        int err = 0, complete_refs_before_fetch = 1;
 855
 856        struct refspec *refspec;
 857        const char *fetch_pattern;
 858
 859        packet_trace_identity("clone");
 860        argc = parse_options(argc, argv, prefix, builtin_clone_options,
 861                             builtin_clone_usage, 0);
 862
 863        if (argc > 2)
 864                usage_msg_opt(_("Too many arguments."),
 865                        builtin_clone_usage, builtin_clone_options);
 866
 867        if (argc == 0)
 868                usage_msg_opt(_("You must specify a repository to clone."),
 869                        builtin_clone_usage, builtin_clone_options);
 870
 871        if (option_single_branch == -1)
 872                option_single_branch = option_depth ? 1 : 0;
 873
 874        if (option_mirror)
 875                option_bare = 1;
 876
 877        if (option_bare) {
 878                if (option_origin)
 879                        die(_("--bare and --origin %s options are incompatible."),
 880                            option_origin);
 881                if (real_git_dir)
 882                        die(_("--bare and --separate-git-dir are incompatible."));
 883                option_no_checkout = 1;
 884        }
 885
 886        if (!option_origin)
 887                option_origin = "origin";
 888
 889        repo_name = argv[0];
 890
 891        path = get_repo_path(repo_name, &is_bundle);
 892        if (path)
 893                repo = xstrdup(absolute_path(repo_name));
 894        else if (!strchr(repo_name, ':'))
 895                die(_("repository '%s' does not exist"), repo_name);
 896        else
 897                repo = repo_name;
 898
 899        /* no need to be strict, transport_set_option() will validate it again */
 900        if (option_depth && atoi(option_depth) < 1)
 901                die(_("depth %s is not a positive number"), option_depth);
 902
 903        if (argc == 2)
 904                dir = xstrdup(argv[1]);
 905        else
 906                dir = guess_dir_name(repo_name, is_bundle, option_bare);
 907        strip_trailing_slashes(dir);
 908
 909        dest_exists = !stat(dir, &buf);
 910        if (dest_exists && !is_empty_dir(dir))
 911                die(_("destination path '%s' already exists and is not "
 912                        "an empty directory."), dir);
 913
 914        strbuf_addf(&reflog_msg, "clone: from %s", repo);
 915
 916        if (option_bare)
 917                work_tree = NULL;
 918        else {
 919                work_tree = getenv("GIT_WORK_TREE");
 920                if (work_tree && !stat(work_tree, &buf))
 921                        die(_("working tree '%s' already exists."), work_tree);
 922        }
 923
 924        if (option_bare || work_tree)
 925                git_dir = xstrdup(dir);
 926        else {
 927                work_tree = dir;
 928                git_dir = mkpathdup("%s/.git", dir);
 929        }
 930
 931        atexit(remove_junk);
 932        sigchain_push_common(remove_junk_on_signal);
 933
 934        if (!option_bare) {
 935                if (safe_create_leading_directories_const(work_tree) < 0)
 936                        die_errno(_("could not create leading directories of '%s'"),
 937                                  work_tree);
 938                if (!dest_exists && mkdir(work_tree, 0777))
 939                        die_errno(_("could not create work tree dir '%s'"),
 940                                  work_tree);
 941                junk_work_tree = work_tree;
 942                set_git_work_tree(work_tree);
 943        }
 944
 945        junk_git_dir = git_dir;
 946        if (safe_create_leading_directories_const(git_dir) < 0)
 947                die(_("could not create leading directories of '%s'"), git_dir);
 948
 949        set_git_dir_init(git_dir, real_git_dir, 0);
 950        if (real_git_dir) {
 951                git_dir = real_git_dir;
 952                junk_git_dir = real_git_dir;
 953        }
 954
 955        if (0 <= option_verbosity) {
 956                if (option_bare)
 957                        fprintf(stderr, _("Cloning into bare repository '%s'...\n"), dir);
 958                else
 959                        fprintf(stderr, _("Cloning into '%s'...\n"), dir);
 960        }
 961        init_db(option_template, INIT_DB_QUIET);
 962        write_config(&option_config);
 963
 964        git_config(git_default_config, NULL);
 965
 966        if (option_bare) {
 967                if (option_mirror)
 968                        src_ref_prefix = "refs/";
 969                strbuf_addstr(&branch_top, src_ref_prefix);
 970
 971                git_config_set("core.bare", "true");
 972        } else {
 973                strbuf_addf(&branch_top, "refs/remotes/%s/", option_origin);
 974        }
 975
 976        strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top.buf);
 977        strbuf_addf(&key, "remote.%s.url", option_origin);
 978        git_config_set(key.buf, repo);
 979        strbuf_reset(&key);
 980
 981        if (option_reference.nr)
 982                setup_reference();
 983
 984        fetch_pattern = value.buf;
 985        refspec = parse_fetch_refspec(1, &fetch_pattern);
 986
 987        strbuf_reset(&value);
 988
 989        remote = remote_get(option_origin);
 990        transport = transport_get(remote, remote->url[0]);
 991        transport_set_verbosity(transport, option_verbosity, option_progress);
 992        transport->family = family;
 993
 994        path = get_repo_path(remote->url[0], &is_bundle);
 995        is_local = option_local != 0 && path && !is_bundle;
 996        if (is_local) {
 997                if (option_depth)
 998                        warning(_("--depth is ignored in local clones; use file:// instead."));
 999                if (!access(mkpath("%s/shallow", path), F_OK)) {
1000                        if (option_local > 0)
1001                                warning(_("source repository is shallow, ignoring --local"));
1002                        is_local = 0;
1003                }
1004        }
1005        if (option_local > 0 && !is_local)
1006                warning(_("--local is ignored"));
1007        transport->cloning = 1;
1008
1009        if (!transport->get_refs_list || (!is_local && !transport->fetch))
1010                die(_("Don't know how to clone %s"), transport->url);
1011
1012        transport_set_option(transport, TRANS_OPT_KEEP, "yes");
1013
1014        if (option_depth)
1015                transport_set_option(transport, TRANS_OPT_DEPTH,
1016                                     option_depth);
1017        if (option_single_branch)
1018                transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
1019
1020        if (option_upload_pack)
1021                transport_set_option(transport, TRANS_OPT_UPLOADPACK,
1022                                     option_upload_pack);
1023
1024        if (transport->smart_options && !option_depth)
1025                transport->smart_options->check_self_contained_and_connected = 1;
1026
1027        refs = transport_get_remote_refs(transport);
1028
1029        if (refs) {
1030                mapped_refs = wanted_peer_refs(refs, refspec);
1031                /*
1032                 * transport_get_remote_refs() may return refs with null sha-1
1033                 * in mapped_refs (see struct transport->get_refs_list
1034                 * comment). In that case we need fetch it early because
1035                 * remote_head code below relies on it.
1036                 *
1037                 * for normal clones, transport_get_remote_refs() should
1038                 * return reliable ref set, we can delay cloning until after
1039                 * remote HEAD check.
1040                 */
1041                for (ref = refs; ref; ref = ref->next)
1042                        if (is_null_oid(&ref->old_oid)) {
1043                                complete_refs_before_fetch = 0;
1044                                break;
1045                        }
1046
1047                if (!is_local && !complete_refs_before_fetch)
1048                        transport_fetch_refs(transport, mapped_refs);
1049
1050                remote_head = find_ref_by_name(refs, "HEAD");
1051                remote_head_points_at =
1052                        guess_remote_head(remote_head, mapped_refs, 0);
1053
1054                if (option_branch) {
1055                        our_head_points_at =
1056                                find_remote_branch(mapped_refs, option_branch);
1057
1058                        if (!our_head_points_at)
1059                                die(_("Remote branch %s not found in upstream %s"),
1060                                    option_branch, option_origin);
1061                }
1062                else
1063                        our_head_points_at = remote_head_points_at;
1064        }
1065        else {
1066                if (option_branch)
1067                        die(_("Remote branch %s not found in upstream %s"),
1068                                        option_branch, option_origin);
1069
1070                warning(_("You appear to have cloned an empty repository."));
1071                mapped_refs = NULL;
1072                our_head_points_at = NULL;
1073                remote_head_points_at = NULL;
1074                remote_head = NULL;
1075                option_no_checkout = 1;
1076                if (!option_bare)
1077                        install_branch_config(0, "master", option_origin,
1078                                              "refs/heads/master");
1079        }
1080
1081        write_refspec_config(src_ref_prefix, our_head_points_at,
1082                        remote_head_points_at, &branch_top);
1083
1084        if (is_local)
1085                clone_local(path, git_dir);
1086        else if (refs && complete_refs_before_fetch)
1087                transport_fetch_refs(transport, mapped_refs);
1088
1089        update_remote_refs(refs, mapped_refs, remote_head_points_at,
1090                           branch_top.buf, reflog_msg.buf, transport, !is_local);
1091
1092        update_head(our_head_points_at, remote_head, reflog_msg.buf);
1093
1094        transport_unlock_pack(transport);
1095        transport_disconnect(transport);
1096
1097        if (option_dissociate) {
1098                close_all_packs();
1099                dissociate_from_references();
1100        }
1101
1102        junk_mode = JUNK_LEAVE_REPO;
1103        err = checkout();
1104
1105        strbuf_release(&reflog_msg);
1106        strbuf_release(&branch_top);
1107        strbuf_release(&key);
1108        strbuf_release(&value);
1109        junk_mode = JUNK_LEAVE_ALL;
1110
1111        free(refspec);
1112        return err;
1113}