git.oblomov.eu Git - git/blob - builtin/clone.c

   1 /*
   2  * Builtin "git clone"
   3  *
   4  * Copyright (c) 2007 Kristian Høgsberg <krh@redhat.com>,
   5  *               2008 Daniel Barkalow <barkalow@iabervon.org>
   6  * Based on git-commit.sh by Junio C Hamano and Linus Torvalds
   7  *
   8  * Clone a repository into a different directory that does not yet exist.
   9  */
  10
  11 #include "cache.h"
  12 #include "parse-options.h"
  13 #include "fetch-pack.h"
  14 #include "refs.h"
  15 #include "tree.h"
  16 #include "tree-walk.h"
  17 #include "unpack-trees.h"
  18 #include "transport.h"
  19 #include "strbuf.h"
  20 #include "dir.h"
  21 #include "pack-refs.h"
  22 #include "sigchain.h"
  23 #include "branch.h"
  24 #include "remote.h"
  25 #include "run-command.h"
  26
  27 /*
  28  * Overall FIXMEs:
  29  *  - respect DB_ENVIRONMENT for .git/objects.
  30  *
  31  * Implementation notes:
  32  *  - dropping use-separate-remote and no-separate-remote compatibility
  33  *
  34  */
  35 static const char * const builtin_clone_usage[] = {
  36         "git clone [options] [--] <repo> [<dir>]",
  37         NULL
  38 };
  39
  40 static int option_no_checkout, option_bare, option_mirror;
  41 static int option_local, option_no_hardlinks, option_shared, option_recursive;
  42 static char *option_template, *option_reference, *option_depth;
  43 static char *option_origin = NULL;
  44 static char *option_branch = NULL;
  45 static char *option_upload_pack = "git-upload-pack";
  46 static int option_verbosity;
  47 static int option_progress;
  48
  49 static struct option builtin_clone_options[] = {
  50         OPT__VERBOSITY(&option_verbosity),
  51         OPT_BOOLEAN(0, "progress", &option_progress,
  52                         "force progress reporting"),
  53         OPT_BOOLEAN('n', "no-checkout", &option_no_checkout,
  54                     "don't create a checkout"),
  55         OPT_BOOLEAN(0, "bare", &option_bare, "create a bare repository"),
  56         { OPTION_BOOLEAN, 0, "naked", &option_bare, NULL,
  57                 "create a bare repository",
  58                 PARSE_OPT_NOARG | PARSE_OPT_HIDDEN },
  59         OPT_BOOLEAN(0, "mirror", &option_mirror,
  60                     "create a mirror repository (implies bare)"),
  61         OPT_BOOLEAN('l', "local", &option_local,
  62                     "to clone from a local repository"),
  63         OPT_BOOLEAN(0, "no-hardlinks", &option_no_hardlinks,
  64                     "don't use local hardlinks, always copy"),
  65         OPT_BOOLEAN('s', "shared", &option_shared,
  66                     "setup as shared repository"),
  67         OPT_BOOLEAN(0, "recursive", &option_recursive,
  68                     "initialize submodules in the clone"),
  69         OPT_STRING(0, "template", &option_template, "path",
  70                    "path the template repository"),
  71         OPT_STRING(0, "reference", &option_reference, "repo",
  72                    "reference repository"),
  73         OPT_STRING('o', "origin", &option_origin, "branch",
  74                    "use <branch> instead of 'origin' to track upstream"),
  75         OPT_STRING('b', "branch", &option_branch, "branch",
  76                    "checkout <branch> instead of the remote's HEAD"),
  77         OPT_STRING('u', "upload-pack", &option_upload_pack, "path",
  78                    "path to git-upload-pack on the remote"),
  79         OPT_STRING(0, "depth", &option_depth, "depth",
  80                     "create a shallow clone of that depth"),
  81
  82         OPT_END()
  83 };
  84
  85 static const char *argv_submodule[] = {
  86         "submodule", "update", "--init", "--recursive", NULL
  87 };
  88
  89 static char *get_repo_path(const char *repo, int *is_bundle)
  90 {
  91         static char *suffix[] = { "/.git", ".git", "" };
  92         static char *bundle_suffix[] = { ".bundle", "" };
  93         struct stat st;
  94         int i;
  95
  96         for (i = 0; i < ARRAY_SIZE(suffix); i++) {
  97                 const char *path;
  98                 path = mkpath("%s%s", repo, suffix[i]);
  99                 if (is_directory(path)) {
 100                         *is_bundle = 0;
 101                         return xstrdup(make_nonrelative_path(path));
 102                 }
 103         }
 104
 105         for (i = 0; i < ARRAY_SIZE(bundle_suffix); i++) {
 106                 const char *path;
 107                 path = mkpath("%s%s", repo, bundle_suffix[i]);
 108                 if (!stat(path, &st) && S_ISREG(st.st_mode)) {
 109                         *is_bundle = 1;
 110                         return xstrdup(make_nonrelative_path(path));
 111                 }
 112         }
 113
 114         return NULL;
 115 }
 116
 117 static char *guess_dir_name(const char *repo, int is_bundle, int is_bare)
 118 {
 119         const char *end = repo + strlen(repo), *start;
 120         char *dir;
 121
 122         /*
 123          * Strip trailing spaces, slashes and /.git
 124          */
 125         while (repo < end && (is_dir_sep(end[-1]) || isspace(end[-1])))
 126                 end--;
 127         if (end - repo > 5 && is_dir_sep(end[-5]) &&
 128             !strncmp(end - 4, ".git", 4)) {
 129                 end -= 5;
 130                 while (repo < end && is_dir_sep(end[-1]))
 131                         end--;
 132         }
 133
 134         /*
 135          * Find last component, but be prepared that repo could have
 136          * the form  "remote.example.com:foo.git", i.e. no slash
 137          * in the directory part.
 138          */
 139         start = end;
 140         while (repo < start && !is_dir_sep(start[-1]) && start[-1] != ':')
 141                 start--;
 142
 143         /*
 144          * Strip .{bundle,git}.
 145          */
 146         if (is_bundle) {
 147                 if (end - start > 7 && !strncmp(end - 7, ".bundle", 7))
 148                         end -= 7;
 149         } else {
 150                 if (end - start > 4 && !strncmp(end - 4, ".git", 4))
 151                         end -= 4;
 152         }
 153
 154         if (is_bare) {
 155                 struct strbuf result = STRBUF_INIT;
 156                 strbuf_addf(&result, "%.*s.git", (int)(end - start), start);
 157                 dir = strbuf_detach(&result, NULL);
 158         } else
 159                 dir = xstrndup(start, end - start);
 160         /*
 161          * Replace sequences of 'control' characters and whitespace
 162          * with one ascii space, remove leading and trailing spaces.
 163          */
 164         if (*dir) {
 165                 char *out = dir;
 166                 int prev_space = 1 /* strip leading whitespace */;
 167                 for (end = dir; *end; ++end) {
 168                         char ch = *end;
 169                         if ((unsigned char)ch < '\x20')
 170                                 ch = '\x20';
 171                         if (isspace(ch)) {
 172                                 if (prev_space)
 173                                         continue;
 174                                 prev_space = 1;
 175                         } else
 176                                 prev_space = 0;
 177                         *out++ = ch;
 178                 }
 179                 *out = '\0';
 180                 if (out > dir && prev_space)
 181                         out[-1] = '\0';
 182         }
 183         return dir;
 184 }
 185
 186 static void strip_trailing_slashes(char *dir)
 187 {
 188         char *end = dir + strlen(dir);
 189
 190         while (dir < end - 1 && is_dir_sep(end[-1]))
 191                 end--;
 192         *end = '\0';
 193 }
 194
 195 static void setup_reference(const char *repo)
 196 {
 197         const char *ref_git;
 198         char *ref_git_copy;
 199
 200         struct remote *remote;
 201         struct transport *transport;
 202         const struct ref *extra;
 203
 204         ref_git = make_absolute_path(option_reference);
 205
 206         if (is_directory(mkpath("%s/.git/objects", ref_git)))
 207                 ref_git = mkpath("%s/.git", ref_git);
 208         else if (!is_directory(mkpath("%s/objects", ref_git)))
 209                 die("reference repository '%s' is not a local directory.",
 210                     option_reference);
 211
 212         ref_git_copy = xstrdup(ref_git);
 213
 214         add_to_alternates_file(ref_git_copy);
 215
 216         remote = remote_get(ref_git_copy);
 217         transport = transport_get(remote, ref_git_copy);
 218         for (extra = transport_get_remote_refs(transport); extra;
 219              extra = extra->next)
 220                 add_extra_ref(extra->name, extra->old_sha1, 0);
 221
 222         transport_disconnect(transport);
 223
 224         free(ref_git_copy);
 225 }
 226
 227 static void copy_or_link_directory(struct strbuf *src, struct strbuf *dest)
 228 {
 229         struct dirent *de;
 230         struct stat buf;
 231         int src_len, dest_len;
 232         DIR *dir;
 233
 234         dir = opendir(src->buf);
 235         if (!dir)
 236                 die_errno("failed to open '%s'", src->buf);
 237
 238         if (mkdir(dest->buf, 0777)) {
 239                 if (errno != EEXIST)
 240                         die_errno("failed to create directory '%s'", dest->buf);
 241                 else if (stat(dest->buf, &buf))
 242                         die_errno("failed to stat '%s'", dest->buf);
 243                 else if (!S_ISDIR(buf.st_mode))
 244                         die("%s exists and is not a directory", dest->buf);
 245         }
 246
 247         strbuf_addch(src, '/');
 248         src_len = src->len;
 249         strbuf_addch(dest, '/');
 250         dest_len = dest->len;
 251
 252         while ((de = readdir(dir)) != NULL) {
 253                 strbuf_setlen(src, src_len);
 254                 strbuf_addstr(src, de->d_name);
 255                 strbuf_setlen(dest, dest_len);
 256                 strbuf_addstr(dest, de->d_name);
 257                 if (stat(src->buf, &buf)) {
 258                         warning ("failed to stat %s\n", src->buf);
 259                         continue;
 260                 }
 261                 if (S_ISDIR(buf.st_mode)) {
 262                         if (de->d_name[0] != '.')
 263                                 copy_or_link_directory(src, dest);
 264                         continue;
 265                 }
 266
 267                 if (unlink(dest->buf) && errno != ENOENT)
 268                         die_errno("failed to unlink '%s'", dest->buf);
 269                 if (!option_no_hardlinks) {
 270                         if (!link(src->buf, dest->buf))
 271                                 continue;
 272                         if (option_local)
 273                                 die_errno("failed to create link '%s'", dest->buf);
 274                         option_no_hardlinks = 1;
 275                 }
 276                 if (copy_file_with_time(dest->buf, src->buf, 0666))
 277                         die_errno("failed to copy file to '%s'", dest->buf);
 278         }
 279         closedir(dir);
 280 }
 281
 282 static const struct ref *clone_local(const char *src_repo,
 283                                      const char *dest_repo)
 284 {
 285         const struct ref *ret;
 286         struct strbuf src = STRBUF_INIT;
 287         struct strbuf dest = STRBUF_INIT;
 288         struct remote *remote;
 289         struct transport *transport;
 290
 291         if (option_shared)
 292                 add_to_alternates_file(src_repo);
 293         else {
 294                 strbuf_addf(&src, "%s/objects", src_repo);
 295                 strbuf_addf(&dest, "%s/objects", dest_repo);
 296                 copy_or_link_directory(&src, &dest);
 297                 strbuf_release(&src);
 298                 strbuf_release(&dest);
 299         }
 300
 301         remote = remote_get(src_repo);
 302         transport = transport_get(remote, src_repo);
 303         ret = transport_get_remote_refs(transport);
 304         transport_disconnect(transport);
 305         if (0 <= option_verbosity)
 306                 printf("done.\n");
 307         return ret;
 308 }
 309
 310 static const char *junk_work_tree;
 311 static const char *junk_git_dir;
 312 static pid_t junk_pid;
 313
 314 static void remove_junk(void)
 315 {
 316         struct strbuf sb = STRBUF_INIT;
 317         if (getpid() != junk_pid)
 318                 return;
 319         if (junk_git_dir) {
 320                 strbuf_addstr(&sb, junk_git_dir);
 321                 remove_dir_recursively(&sb, 0);
 322                 strbuf_reset(&sb);
 323         }
 324         if (junk_work_tree) {
 325                 strbuf_addstr(&sb, junk_work_tree);
 326                 remove_dir_recursively(&sb, 0);
 327                 strbuf_reset(&sb);
 328         }
 329 }
 330
 331 static void remove_junk_on_signal(int signo)
 332 {
 333         remove_junk();
 334         sigchain_pop(signo);
 335         raise(signo);
 336 }
 337
 338 static struct ref *wanted_peer_refs(const struct ref *refs,
 339                 struct refspec *refspec)
 340 {
 341         struct ref *local_refs = NULL;
 342         struct ref **tail = &local_refs;
 343
 344         get_fetch_map(refs, refspec, &tail, 0);
 345         if (!option_mirror)
 346                 get_fetch_map(refs, tag_refspec, &tail, 0);
 347
 348         return local_refs;
 349 }
 350
 351 static void write_remote_refs(const struct ref *local_refs)
 352 {
 353         const struct ref *r;
 354
 355         for (r = local_refs; r; r = r->next)
 356                 add_extra_ref(r->peer_ref->name, r->old_sha1, 0);
 357
 358         pack_refs(PACK_REFS_ALL);
 359         clear_extra_refs();
 360 }
 361
 362 int cmd_clone(int argc, const char **argv, const char *prefix)
 363 {
 364         int is_bundle = 0;
 365         struct stat buf;
 366         const char *repo_name, *repo, *work_tree, *git_dir;
 367         char *path, *dir;
 368         int dest_exists;
 369         const struct ref *refs, *remote_head;
 370         const struct ref *remote_head_points_at;
 371         const struct ref *our_head_points_at;
 372         struct ref *mapped_refs;
 373         struct strbuf key = STRBUF_INIT, value = STRBUF_INIT;
 374         struct strbuf branch_top = STRBUF_INIT, reflog_msg = STRBUF_INIT;
 375         struct transport *transport = NULL;
 376         char *src_ref_prefix = "refs/heads/";
 377         int err = 0;
 378
 379         struct refspec *refspec;
 380         const char *fetch_pattern;
 381
 382         junk_pid = getpid();
 383
 384         argc = parse_options(argc, argv, prefix, builtin_clone_options,
 385                              builtin_clone_usage, 0);
 386
 387         if (argc > 2)
 388                 usage_msg_opt("Too many arguments.",
 389                         builtin_clone_usage, builtin_clone_options);
 390
 391         if (argc == 0)
 392                 usage_msg_opt("You must specify a repository to clone.",
 393                         builtin_clone_usage, builtin_clone_options);
 394
 395         if (option_mirror)
 396                 option_bare = 1;
 397
 398         if (option_bare) {
 399                 if (option_origin)
 400                         die("--bare and --origin %s options are incompatible.",
 401                             option_origin);
 402                 option_no_checkout = 1;
 403         }
 404
 405         if (!option_origin)
 406                 option_origin = "origin";
 407
 408         repo_name = argv[0];
 409
 410         path = get_repo_path(repo_name, &is_bundle);
 411         if (path)
 412                 repo = xstrdup(make_nonrelative_path(repo_name));
 413         else if (!strchr(repo_name, ':'))
 414                 repo = xstrdup(make_absolute_path(repo_name));
 415         else
 416                 repo = repo_name;
 417
 418         if (argc == 2)
 419                 dir = xstrdup(argv[1]);
 420         else
 421                 dir = guess_dir_name(repo_name, is_bundle, option_bare);
 422         strip_trailing_slashes(dir);
 423
 424         dest_exists = !stat(dir, &buf);
 425         if (dest_exists && !is_empty_dir(dir))
 426                 die("destination path '%s' already exists and is not "
 427                         "an empty directory.", dir);
 428
 429         strbuf_addf(&reflog_msg, "clone: from %s", repo);
 430
 431         if (option_bare)
 432                 work_tree = NULL;
 433         else {
 434                 work_tree = getenv("GIT_WORK_TREE");
 435                 if (work_tree && !stat(work_tree, &buf))
 436                         die("working tree '%s' already exists.", work_tree);
 437         }
 438
 439         if (option_bare || work_tree)
 440                 git_dir = xstrdup(dir);
 441         else {
 442                 work_tree = dir;
 443                 git_dir = xstrdup(mkpath("%s/.git", dir));
 444         }
 445
 446         if (!option_bare) {
 447                 junk_work_tree = work_tree;
 448                 if (safe_create_leading_directories_const(work_tree) < 0)
 449                         die_errno("could not create leading directories of '%s'",
 450                                   work_tree);
 451                 if (!dest_exists && mkdir(work_tree, 0755))
 452                         die_errno("could not create work tree dir '%s'.",
 453                                   work_tree);
 454                 set_git_work_tree(work_tree);
 455         }
 456         junk_git_dir = git_dir;
 457         atexit(remove_junk);
 458         sigchain_push_common(remove_junk_on_signal);
 459
 460         setenv(CONFIG_ENVIRONMENT, mkpath("%s/config", git_dir), 1);
 461
 462         if (safe_create_leading_directories_const(git_dir) < 0)
 463                 die("could not create leading directories of '%s'", git_dir);
 464         set_git_dir(make_absolute_path(git_dir));
 465
 466         if (0 <= option_verbosity)
 467                 printf("Cloning into %s%s...\n",
 468                        option_bare ? "bare repository " : "", dir);
 469         init_db(option_template, INIT_DB_QUIET);
 470
 471         /*
 472          * At this point, the config exists, so we do not need the
 473          * environment variable.  We actually need to unset it, too, to
 474          * re-enable parsing of the global configs.
 475          */
 476         unsetenv(CONFIG_ENVIRONMENT);
 477
 478         git_config(git_default_config, NULL);
 479
 480         if (option_bare) {
 481                 if (option_mirror)
 482                         src_ref_prefix = "refs/";
 483                 strbuf_addstr(&branch_top, src_ref_prefix);
 484
 485                 git_config_set("core.bare", "true");
 486         } else {
 487                 strbuf_addf(&branch_top, "refs/remotes/%s/", option_origin);
 488         }
 489
 490         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top.buf);
 491
 492         if (option_mirror || !option_bare) {
 493                 /* Configure the remote */
 494                 strbuf_addf(&key, "remote.%s.fetch", option_origin);
 495                 git_config_set_multivar(key.buf, value.buf, "^$", 0);
 496                 strbuf_reset(&key);
 497
 498                 if (option_mirror) {
 499                         strbuf_addf(&key, "remote.%s.mirror", option_origin);
 500                         git_config_set(key.buf, "true");
 501                         strbuf_reset(&key);
 502                 }
 503         }
 504
 505         strbuf_addf(&key, "remote.%s.url", option_origin);
 506         git_config_set(key.buf, repo);
 507         strbuf_reset(&key);
 508
 509         if (option_reference)
 510                 setup_reference(git_dir);
 511
 512         fetch_pattern = value.buf;
 513         refspec = parse_fetch_refspec(1, &fetch_pattern);
 514
 515         strbuf_reset(&value);
 516
 517         if (path && !is_bundle) {
 518                 refs = clone_local(path, git_dir);
 519                 mapped_refs = wanted_peer_refs(refs, refspec);
 520         } else {
 521                 struct remote *remote = remote_get(option_origin);
 522                 transport = transport_get(remote, remote->url[0]);
 523
 524                 if (!transport->get_refs_list || !transport->fetch)
 525                         die("Don't know how to clone %s", transport->url);
 526
 527                 transport_set_option(transport, TRANS_OPT_KEEP, "yes");
 528
 529                 if (option_depth)
 530                         transport_set_option(transport, TRANS_OPT_DEPTH,
 531                                              option_depth);
 532
 533                 transport_set_verbosity(transport, option_verbosity, option_progress);
 534
 535                 if (option_upload_pack)
 536                         transport_set_option(transport, TRANS_OPT_UPLOADPACK,
 537                                              option_upload_pack);
 538
 539                 refs = transport_get_remote_refs(transport);
 540                 if (refs) {
 541                         mapped_refs = wanted_peer_refs(refs, refspec);
 542                         transport_fetch_refs(transport, mapped_refs);
 543                 }
 544         }
 545
 546         if (refs) {
 547                 clear_extra_refs();
 548
 549                 write_remote_refs(mapped_refs);
 550
 551                 remote_head = find_ref_by_name(refs, "HEAD");
 552                 remote_head_points_at =
 553                         guess_remote_head(remote_head, mapped_refs, 0);
 554
 555                 if (option_branch) {
 556                         struct strbuf head = STRBUF_INIT;
 557                         strbuf_addstr(&head, src_ref_prefix);
 558                         strbuf_addstr(&head, option_branch);
 559                         our_head_points_at =
 560                                 find_ref_by_name(mapped_refs, head.buf);
 561                         strbuf_release(&head);
 562
 563                         if (!our_head_points_at) {
 564                                 warning("Remote branch %s not found in "
 565                                         "upstream %s, using HEAD instead",
 566                                         option_branch, option_origin);
 567                                 our_head_points_at = remote_head_points_at;
 568                         }
 569                 }
 570                 else
 571                         our_head_points_at = remote_head_points_at;
 572         }
 573         else {
 574                 warning("You appear to have cloned an empty repository.");
 575                 our_head_points_at = NULL;
 576                 remote_head_points_at = NULL;
 577                 remote_head = NULL;
 578                 option_no_checkout = 1;
 579                 if (!option_bare)
 580                         install_branch_config(0, "master", option_origin,
 581                                               "refs/heads/master");
 582         }
 583
 584         if (remote_head_points_at && !option_bare) {
 585                 struct strbuf head_ref = STRBUF_INIT;
 586                 strbuf_addstr(&head_ref, branch_top.buf);
 587                 strbuf_addstr(&head_ref, "HEAD");
 588                 create_symref(head_ref.buf,
 589                               remote_head_points_at->peer_ref->name,
 590                               reflog_msg.buf);
 591         }
 592
 593         if (our_head_points_at) {
 594                 /* Local default branch link */
 595                 create_symref("HEAD", our_head_points_at->name, NULL);
 596                 if (!option_bare) {
 597                         const char *head = skip_prefix(our_head_points_at->name,
 598                                                        "refs/heads/");
 599                         update_ref(reflog_msg.buf, "HEAD",
 600                                    our_head_points_at->old_sha1,
 601                                    NULL, 0, DIE_ON_ERR);
 602                         install_branch_config(0, head, option_origin,
 603                                               our_head_points_at->name);
 604                 }
 605         } else if (remote_head) {
 606                 /* Source had detached HEAD pointing somewhere. */
 607                 if (!option_bare) {
 608                         update_ref(reflog_msg.buf, "HEAD",
 609                                    remote_head->old_sha1,
 610                                    NULL, REF_NODEREF, DIE_ON_ERR);
 611                         our_head_points_at = remote_head;
 612                 }
 613         } else {
 614                 /* Nothing to checkout out */
 615                 if (!option_no_checkout)
 616                         warning("remote HEAD refers to nonexistent ref, "
 617                                 "unable to checkout.\n");
 618                 option_no_checkout = 1;
 619         }
 620
 621         if (transport) {
 622                 transport_unlock_pack(transport);
 623                 transport_disconnect(transport);
 624         }
 625
 626         if (!option_no_checkout) {
 627                 struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file));
 628                 struct unpack_trees_options opts;
 629                 struct tree *tree;
 630                 struct tree_desc t;
 631                 int fd;
 632
 633                 /* We need to be in the new work tree for the checkout */
 634                 setup_work_tree();
 635
 636                 fd = hold_locked_index(lock_file, 1);
 637
 638                 memset(&opts, 0, sizeof opts);
 639                 opts.update = 1;
 640                 opts.merge = 1;
 641                 opts.fn = oneway_merge;
 642                 opts.verbose_update = (option_verbosity > 0);
 643                 opts.src_index = &the_index;
 644                 opts.dst_index = &the_index;
 645
 646                 tree = parse_tree_indirect(our_head_points_at->old_sha1);
 647                 parse_tree(tree);
 648                 init_tree_desc(&t, tree->buffer, tree->size);
 649                 unpack_trees(1, &t, &opts);
 650
 651                 if (write_cache(fd, active_cache, active_nr) ||
 652                     commit_locked_index(lock_file))
 653                         die("unable to write new index file");
 654
 655                 err |= run_hook(NULL, "post-checkout", sha1_to_hex(null_sha1),
 656                                 sha1_to_hex(our_head_points_at->old_sha1), "1",
 657                                 NULL);
 658
 659                 if (!err && option_recursive)
 660                         err = run_command_v_opt(argv_submodule, RUN_GIT_CMD);
 661         }
 662
 663         strbuf_release(&reflog_msg);
 664         strbuf_release(&branch_top);
 665         strbuf_release(&key);
 666         strbuf_release(&value);
 667         junk_pid = 0;
 668         return err;
 669 }