git.oblomov.eu Git - git/blob - archive.c

   1 #include "cache.h"
   2 #include "config.h"
   3 #include "refs.h"
   4 #include "object-store.h"
   5 #include "commit.h"
   6 #include "tree-walk.h"
   7 #include "attr.h"
   8 #include "archive.h"
   9 #include "parse-options.h"
  10 #include "unpack-trees.h"
  11 #include "dir.h"
  12
  13 static char const * const archive_usage[] = {
  14         N_("git archive [<options>] <tree-ish> [<path>...]"),
  15         N_("git archive --list"),
  16         N_("git archive --remote <repo> [--exec <cmd>] [<options>] <tree-ish> [<path>...]"),
  17         N_("git archive --remote <repo> [--exec <cmd>] --list"),
  18         NULL
  19 };
  20
  21 static const struct archiver **archivers;
  22 static int nr_archivers;
  23 static int alloc_archivers;
  24 static int remote_allow_unreachable;
  25
  26 void register_archiver(struct archiver *ar)
  27 {
  28         ALLOC_GROW(archivers, nr_archivers + 1, alloc_archivers);
  29         archivers[nr_archivers++] = ar;
  30 }
  31
  32 void init_archivers(void)
  33 {
  34         init_tar_archiver();
  35         init_zip_archiver();
  36 }
  37
  38 static void format_subst(const struct commit *commit,
  39                          const char *src, size_t len,
  40                          struct strbuf *buf)
  41 {
  42         char *to_free = NULL;
  43         struct strbuf fmt = STRBUF_INIT;
  44         struct pretty_print_context ctx = {0};
  45         ctx.date_mode.type = DATE_NORMAL;
  46         ctx.abbrev = DEFAULT_ABBREV;
  47
  48         if (src == buf->buf)
  49                 to_free = strbuf_detach(buf, NULL);
  50         for (;;) {
  51                 const char *b, *c;
  52
  53                 b = memmem(src, len, "$Format:", 8);
  54                 if (!b)
  55                         break;
  56                 c = memchr(b + 8, '$', (src + len) - b - 8);
  57                 if (!c)
  58                         break;
  59
  60                 strbuf_reset(&fmt);
  61                 strbuf_add(&fmt, b + 8, c - b - 8);
  62
  63                 strbuf_add(buf, src, b - src);
  64                 format_commit_message(commit, fmt.buf, buf, &ctx);
  65                 len -= c + 1 - src;
  66                 src  = c + 1;
  67         }
  68         strbuf_add(buf, src, len);
  69         strbuf_release(&fmt);
  70         free(to_free);
  71 }
  72
  73 static void *object_file_to_archive(const struct archiver_args *args,
  74                                     const char *path,
  75                                     const struct object_id *oid,
  76                                     unsigned int mode,
  77                                     enum object_type *type,
  78                                     unsigned long *sizep)
  79 {
  80         void *buffer;
  81         const struct commit *commit = args->convert ? args->commit : NULL;
  82         struct checkout_metadata meta;
  83
  84         init_checkout_metadata(&meta, args->refname,
  85                                args->commit_oid ? args->commit_oid :
  86                                (args->tree ? &args->tree->object.oid : NULL), oid);
  87
  88         path += args->baselen;
  89         buffer = read_object_file(oid, type, sizep);
  90         if (buffer && S_ISREG(mode)) {
  91                 struct strbuf buf = STRBUF_INIT;
  92                 size_t size = 0;
  93
  94                 strbuf_attach(&buf, buffer, *sizep, *sizep + 1);
  95                 convert_to_working_tree(args->repo->index, path, buf.buf, buf.len, &buf, &meta);
  96                 if (commit)
  97                         format_subst(commit, buf.buf, buf.len, &buf);
  98                 buffer = strbuf_detach(&buf, &size);
  99                 *sizep = size;
 100         }
 101
 102         return buffer;
 103 }
 104
 105 struct directory {
 106         struct directory *up;
 107         struct object_id oid;
 108         int baselen, len;
 109         unsigned mode;
 110         char path[FLEX_ARRAY];
 111 };
 112
 113 struct archiver_context {
 114         struct archiver_args *args;
 115         write_archive_entry_fn_t write_entry;
 116         struct directory *bottom;
 117 };
 118
 119 static const struct attr_check *get_archive_attrs(struct index_state *istate,
 120                                                   const char *path)
 121 {
 122         static struct attr_check *check;
 123         if (!check)
 124                 check = attr_check_initl("export-ignore", "export-subst", NULL);
 125         git_check_attr(istate, path, check);
 126         return check;
 127 }
 128
 129 static int check_attr_export_ignore(const struct attr_check *check)
 130 {
 131         return check && ATTR_TRUE(check->items[0].value);
 132 }
 133
 134 static int check_attr_export_subst(const struct attr_check *check)
 135 {
 136         return check && ATTR_TRUE(check->items[1].value);
 137 }
 138
 139 static int write_archive_entry(const struct object_id *oid, const char *base,
 140                 int baselen, const char *filename, unsigned mode,
 141                 void *context)
 142 {
 143         static struct strbuf path = STRBUF_INIT;
 144         struct archiver_context *c = context;
 145         struct archiver_args *args = c->args;
 146         write_archive_entry_fn_t write_entry = c->write_entry;
 147         int err;
 148         const char *path_without_prefix;
 149         unsigned long size;
 150         void *buffer;
 151         enum object_type type;
 152
 153         args->convert = 0;
 154         strbuf_reset(&path);
 155         strbuf_grow(&path, PATH_MAX);
 156         strbuf_add(&path, args->base, args->baselen);
 157         strbuf_add(&path, base, baselen);
 158         strbuf_addstr(&path, filename);
 159         if (S_ISDIR(mode) || S_ISGITLINK(mode))
 160                 strbuf_addch(&path, '/');
 161         path_without_prefix = path.buf + args->baselen;
 162
 163         if (!S_ISDIR(mode)) {
 164                 const struct attr_check *check;
 165                 check = get_archive_attrs(args->repo->index, path_without_prefix);
 166                 if (check_attr_export_ignore(check))
 167                         return 0;
 168                 args->convert = check_attr_export_subst(check);
 169         }
 170
 171         if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
 172                 if (args->verbose)
 173                         fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
 174                 err = write_entry(args, oid, path.buf, path.len, mode, NULL, 0);
 175                 if (err)
 176                         return err;
 177                 return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0);
 178         }
 179
 180         if (args->verbose)
 181                 fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
 182
 183         /* Stream it? */
 184         if (S_ISREG(mode) && !args->convert &&
 185             oid_object_info(args->repo, oid, &size) == OBJ_BLOB &&
 186             size > big_file_threshold)
 187                 return write_entry(args, oid, path.buf, path.len, mode, NULL, size);
 188
 189         buffer = object_file_to_archive(args, path.buf, oid, mode, &type, &size);
 190         if (!buffer)
 191                 return error(_("cannot read %s"), oid_to_hex(oid));
 192         err = write_entry(args, oid, path.buf, path.len, mode, buffer, size);
 193         free(buffer);
 194         return err;
 195 }
 196
 197 static void queue_directory(const unsigned char *sha1,
 198                 struct strbuf *base, const char *filename,
 199                 unsigned mode, struct archiver_context *c)
 200 {
 201         struct directory *d;
 202         size_t len = st_add4(base->len, 1, strlen(filename), 1);
 203         d = xmalloc(st_add(sizeof(*d), len));
 204         d->up      = c->bottom;
 205         d->baselen = base->len;
 206         d->mode    = mode;
 207         c->bottom  = d;
 208         d->len = xsnprintf(d->path, len, "%.*s%s/", (int)base->len, base->buf, filename);
 209         hashcpy(d->oid.hash, sha1);
 210 }
 211
 212 static int write_directory(struct archiver_context *c)
 213 {
 214         struct directory *d = c->bottom;
 215         int ret;
 216
 217         if (!d)
 218                 return 0;
 219         c->bottom = d->up;
 220         d->path[d->len - 1] = '\0'; /* no trailing slash */
 221         ret =
 222                 write_directory(c) ||
 223                 write_archive_entry(&d->oid, d->path, d->baselen,
 224                                     d->path + d->baselen, d->mode,
 225                                     c) != READ_TREE_RECURSIVE;
 226         free(d);
 227         return ret ? -1 : 0;
 228 }
 229
 230 static int queue_or_write_archive_entry(const struct object_id *oid,
 231                 struct strbuf *base, const char *filename,
 232                 unsigned mode, void *context)
 233 {
 234         struct archiver_context *c = context;
 235
 236         while (c->bottom &&
 237                !(base->len >= c->bottom->len &&
 238                  !strncmp(base->buf, c->bottom->path, c->bottom->len))) {
 239                 struct directory *next = c->bottom->up;
 240                 free(c->bottom);
 241                 c->bottom = next;
 242         }
 243
 244         if (S_ISDIR(mode)) {
 245                 size_t baselen = base->len;
 246                 const struct attr_check *check;
 247
 248                 /* Borrow base, but restore its original value when done. */
 249                 strbuf_addstr(base, filename);
 250                 strbuf_addch(base, '/');
 251                 check = get_archive_attrs(c->args->repo->index, base->buf);
 252                 strbuf_setlen(base, baselen);
 253
 254                 if (check_attr_export_ignore(check))
 255                         return 0;
 256                 queue_directory(oid->hash, base, filename,
 257                                 mode, c);
 258                 return READ_TREE_RECURSIVE;
 259         }
 260
 261         if (write_directory(c))
 262                 return -1;
 263         return write_archive_entry(oid, base->buf, base->len, filename, mode,
 264                                    context);
 265 }
 266
 267 struct extra_file_info {
 268         char *base;
 269         struct stat stat;
 270 };
 271
 272 int write_archive_entries(struct archiver_args *args,
 273                 write_archive_entry_fn_t write_entry)
 274 {
 275         struct archiver_context context;
 276         struct unpack_trees_options opts;
 277         struct tree_desc t;
 278         int err;
 279         struct strbuf path_in_archive = STRBUF_INIT;
 280         struct strbuf content = STRBUF_INIT;
 281         struct object_id fake_oid = null_oid;
 282         int i;
 283
 284         if (args->baselen > 0 && args->base[args->baselen - 1] == '/') {
 285                 size_t len = args->baselen;
 286
 287                 while (len > 1 && args->base[len - 2] == '/')
 288                         len--;
 289                 if (args->verbose)
 290                         fprintf(stderr, "%.*s\n", (int)len, args->base);
 291                 err = write_entry(args, &args->tree->object.oid, args->base,
 292                                   len, 040777, NULL, 0);
 293                 if (err)
 294                         return err;
 295         }
 296
 297         memset(&context, 0, sizeof(context));
 298         context.args = args;
 299         context.write_entry = write_entry;
 300
 301         /*
 302          * Setup index and instruct attr to read index only
 303          */
 304         if (!args->worktree_attributes) {
 305                 memset(&opts, 0, sizeof(opts));
 306                 opts.index_only = 1;
 307                 opts.head_idx = -1;
 308                 opts.src_index = args->repo->index;
 309                 opts.dst_index = args->repo->index;
 310                 opts.fn = oneway_merge;
 311                 init_tree_desc(&t, args->tree->buffer, args->tree->size);
 312                 if (unpack_trees(1, &t, &opts))
 313                         return -1;
 314                 git_attr_set_direction(GIT_ATTR_INDEX);
 315         }
 316
 317         err = read_tree(args->repo, args->tree,
 318                         &args->pathspec,
 319                         queue_or_write_archive_entry,
 320                         &context);
 321         if (err == READ_TREE_RECURSIVE)
 322                 err = 0;
 323         while (context.bottom) {
 324                 struct directory *next = context.bottom->up;
 325                 free(context.bottom);
 326                 context.bottom = next;
 327         }
 328
 329         for (i = 0; i < args->extra_files.nr; i++) {
 330                 struct string_list_item *item = args->extra_files.items + i;
 331                 char *path = item->string;
 332                 struct extra_file_info *info = item->util;
 333
 334                 put_be64(fake_oid.hash, i + 1);
 335
 336                 strbuf_reset(&path_in_archive);
 337                 if (info->base)
 338                         strbuf_addstr(&path_in_archive, info->base);
 339                 strbuf_addstr(&path_in_archive, basename(path));
 340
 341                 strbuf_reset(&content);
 342                 if (strbuf_read_file(&content, path, info->stat.st_size) < 0)
 343                         err = error_errno(_("could not read '%s'"), path);
 344                 else
 345                         err = write_entry(args, &fake_oid, path_in_archive.buf,
 346                                           path_in_archive.len,
 347                                           info->stat.st_mode,
 348                                           content.buf, content.len);
 349                 if (err)
 350                         break;
 351         }
 352         strbuf_release(&path_in_archive);
 353         strbuf_release(&content);
 354
 355         return err;
 356 }
 357
 358 static const struct archiver *lookup_archiver(const char *name)
 359 {
 360         int i;
 361
 362         if (!name)
 363                 return NULL;
 364
 365         for (i = 0; i < nr_archivers; i++) {
 366                 if (!strcmp(name, archivers[i]->name))
 367                         return archivers[i];
 368         }
 369         return NULL;
 370 }
 371
 372 struct path_exists_context {
 373         struct pathspec pathspec;
 374         struct archiver_args *args;
 375 };
 376
 377 static int reject_entry(const struct object_id *oid, struct strbuf *base,
 378                         const char *filename, unsigned mode,
 379                         void *context)
 380 {
 381         int ret = -1;
 382         struct path_exists_context *ctx = context;
 383
 384         if (S_ISDIR(mode)) {
 385                 struct strbuf sb = STRBUF_INIT;
 386                 strbuf_addbuf(&sb, base);
 387                 strbuf_addstr(&sb, filename);
 388                 if (!match_pathspec(ctx->args->repo->index,
 389                                     &ctx->pathspec,
 390                                     sb.buf, sb.len, 0, NULL, 1))
 391                         ret = READ_TREE_RECURSIVE;
 392                 strbuf_release(&sb);
 393         }
 394         return ret;
 395 }
 396
 397 static int path_exists(struct archiver_args *args, const char *path)
 398 {
 399         const char *paths[] = { path, NULL };
 400         struct path_exists_context ctx;
 401         int ret;
 402
 403         ctx.args = args;
 404         parse_pathspec(&ctx.pathspec, 0, 0, "", paths);
 405         ctx.pathspec.recursive = 1;
 406         ret = read_tree(args->repo, args->tree,
 407                         &ctx.pathspec,
 408                         reject_entry, &ctx);
 409         clear_pathspec(&ctx.pathspec);
 410         return ret != 0;
 411 }
 412
 413 static void parse_pathspec_arg(const char **pathspec,
 414                 struct archiver_args *ar_args)
 415 {
 416         /*
 417          * must be consistent with parse_pathspec in path_exists()
 418          * Also if pathspec patterns are dependent, we're in big
 419          * trouble as we test each one separately
 420          */
 421         parse_pathspec(&ar_args->pathspec, 0,
 422                        PATHSPEC_PREFER_FULL,
 423                        "", pathspec);
 424         ar_args->pathspec.recursive = 1;
 425         if (pathspec) {
 426                 while (*pathspec) {
 427                         if (**pathspec && !path_exists(ar_args, *pathspec))
 428                                 die(_("pathspec '%s' did not match any files"), *pathspec);
 429                         pathspec++;
 430                 }
 431         }
 432 }
 433
 434 static void parse_treeish_arg(const char **argv,
 435                 struct archiver_args *ar_args, const char *prefix,
 436                 int remote)
 437 {
 438         const char *name = argv[0];
 439         const struct object_id *commit_oid;
 440         time_t archive_time;
 441         struct tree *tree;
 442         const struct commit *commit;
 443         struct object_id oid;
 444         char *ref = NULL;
 445
 446         /* Remotes are only allowed to fetch actual refs */
 447         if (remote && !remote_allow_unreachable) {
 448                 const char *colon = strchrnul(name, ':');
 449                 int refnamelen = colon - name;
 450
 451                 if (!dwim_ref(name, refnamelen, &oid, &ref, 0))
 452                         die(_("no such ref: %.*s"), refnamelen, name);
 453         } else {
 454                 dwim_ref(name, strlen(name), &oid, &ref, 0);
 455         }
 456
 457         if (get_oid(name, &oid))
 458                 die(_("not a valid object name: %s"), name);
 459
 460         commit = lookup_commit_reference_gently(ar_args->repo, &oid, 1);
 461         if (commit) {
 462                 commit_oid = &commit->object.oid;
 463                 archive_time = commit->date;
 464         } else {
 465                 commit_oid = NULL;
 466                 archive_time = time(NULL);
 467         }
 468
 469         tree = parse_tree_indirect(&oid);
 470         if (tree == NULL)
 471                 die(_("not a tree object: %s"), oid_to_hex(&oid));
 472
 473         if (prefix) {
 474                 struct object_id tree_oid;
 475                 unsigned short mode;
 476                 int err;
 477
 478                 err = get_tree_entry(ar_args->repo,
 479                                      &tree->object.oid,
 480                                      prefix, &tree_oid,
 481                                      &mode);
 482                 if (err || !S_ISDIR(mode))
 483                         die(_("current working directory is untracked"));
 484
 485                 tree = parse_tree_indirect(&tree_oid);
 486         }
 487         ar_args->refname = ref;
 488         ar_args->tree = tree;
 489         ar_args->commit_oid = commit_oid;
 490         ar_args->commit = commit;
 491         ar_args->time = archive_time;
 492 }
 493
 494 static void extra_file_info_clear(void *util, const char *str)
 495 {
 496         struct extra_file_info *info = util;
 497         free(info->base);
 498         free(info);
 499 }
 500
 501 static int add_file_cb(const struct option *opt, const char *arg, int unset)
 502 {
 503         struct archiver_args *args = opt->value;
 504         const char **basep = (const char **)opt->defval;
 505         const char *base = *basep;
 506         char *path;
 507         struct string_list_item *item;
 508         struct extra_file_info *info;
 509
 510         if (unset) {
 511                 string_list_clear_func(&args->extra_files,
 512                                        extra_file_info_clear);
 513                 return 0;
 514         }
 515
 516         if (!arg)
 517                 return -1;
 518
 519         path = prefix_filename(args->prefix, arg);
 520         item = string_list_append_nodup(&args->extra_files, path);
 521         item->util = info = xmalloc(sizeof(*info));
 522         info->base = xstrdup_or_null(base);
 523         if (stat(path, &info->stat))
 524                 die(_("File not found: %s"), path);
 525         if (!S_ISREG(info->stat.st_mode))
 526                 die(_("Not a regular file: %s"), path);
 527         return 0;
 528 }
 529
 530 static int number_callback(const struct option *opt, const char *arg, int unset)
 531 {
 532         BUG_ON_OPT_NEG(unset);
 533         *(int *)opt->value = strtol(arg, NULL, 10);
 534         return 0;
 535 }
 536
 537 static int parse_archive_args(int argc, const char **argv,
 538                 const struct archiver **ar, struct archiver_args *args,
 539                 const char *name_hint, int is_remote)
 540 {
 541         const char *format = NULL;
 542         const char *base = NULL;
 543         const char *remote = NULL;
 544         const char *exec = NULL;
 545         const char *output = NULL;
 546         int compression_level = -1;
 547         int verbose = 0;
 548         int i;
 549         int list = 0;
 550         int worktree_attributes = 0;
 551         struct option opts[] = {
 552                 OPT_GROUP(""),
 553                 OPT_STRING(0, "format", &format, N_("fmt"), N_("archive format")),
 554                 OPT_STRING(0, "prefix", &base, N_("prefix"),
 555                         N_("prepend prefix to each pathname in the archive")),
 556                 { OPTION_CALLBACK, 0, "add-file", args, N_("file"),
 557                   N_("add untracked file to archive"), 0, add_file_cb,
 558                   (intptr_t)&base },
 559                 OPT_STRING('o', "output", &output, N_("file"),
 560                         N_("write the archive to this file")),
 561                 OPT_BOOL(0, "worktree-attributes", &worktree_attributes,
 562                         N_("read .gitattributes in working directory")),
 563                 OPT__VERBOSE(&verbose, N_("report archived files on stderr")),
 564                 OPT_NUMBER_CALLBACK(&compression_level,
 565                         N_("set compression level"), number_callback),
 566                 OPT_GROUP(""),
 567                 OPT_BOOL('l', "list", &list,
 568                         N_("list supported archive formats")),
 569                 OPT_GROUP(""),
 570                 OPT_STRING(0, "remote", &remote, N_("repo"),
 571                         N_("retrieve the archive from remote repository <repo>")),
 572                 OPT_STRING(0, "exec", &exec, N_("command"),
 573                         N_("path to the remote git-upload-archive command")),
 574                 OPT_END()
 575         };
 576
 577         argc = parse_options(argc, argv, NULL, opts, archive_usage, 0);
 578
 579         if (remote)
 580                 die(_("Unexpected option --remote"));
 581         if (exec)
 582                 die(_("Option --exec can only be used together with --remote"));
 583         if (output)
 584                 die(_("Unexpected option --output"));
 585         if (is_remote && args->extra_files.nr)
 586                 die(_("Options --add-file and --remote cannot be used together"));
 587
 588         if (!base)
 589                 base = "";
 590
 591         if (list) {
 592                 for (i = 0; i < nr_archivers; i++)
 593                         if (!is_remote || archivers[i]->flags & ARCHIVER_REMOTE)
 594                                 printf("%s\n", archivers[i]->name);
 595                 exit(0);
 596         }
 597
 598         if (!format && name_hint)
 599                 format = archive_format_from_filename(name_hint);
 600         if (!format)
 601                 format = "tar";
 602
 603         /* We need at least one parameter -- tree-ish */
 604         if (argc < 1)
 605                 usage_with_options(archive_usage, opts);
 606         *ar = lookup_archiver(format);
 607         if (!*ar || (is_remote && !((*ar)->flags & ARCHIVER_REMOTE)))
 608                 die(_("Unknown archive format '%s'"), format);
 609
 610         args->compression_level = Z_DEFAULT_COMPRESSION;
 611         if (compression_level != -1) {
 612                 int levels_ok = (*ar)->flags & ARCHIVER_WANT_COMPRESSION_LEVELS;
 613                 int high_ok = (*ar)->flags & ARCHIVER_HIGH_COMPRESSION_LEVELS;
 614                 if (levels_ok && (compression_level <= 9 || high_ok))
 615                         args->compression_level = compression_level;
 616                 else {
 617                         die(_("Argument not supported for format '%s': -%d"),
 618                                         format, compression_level);
 619                 }
 620         }
 621         args->verbose = verbose;
 622         args->base = base;
 623         args->baselen = strlen(base);
 624         args->worktree_attributes = worktree_attributes;
 625
 626         return argc;
 627 }
 628
 629 int write_archive(int argc, const char **argv, const char *prefix,
 630                   struct repository *repo,
 631                   const char *name_hint, int remote)
 632 {
 633         const struct archiver *ar = NULL;
 634         struct archiver_args args;
 635         int rc;
 636
 637         git_config_get_bool("uploadarchive.allowunreachable", &remote_allow_unreachable);
 638         git_config(git_default_config, NULL);
 639
 640         args.repo = repo;
 641         args.prefix = prefix;
 642         string_list_init(&args.extra_files, 1);
 643         argc = parse_archive_args(argc, argv, &ar, &args, name_hint, remote);
 644         if (!startup_info->have_repository) {
 645                 /*
 646                  * We know this will die() with an error, so we could just
 647                  * die ourselves; but its error message will be more specific
 648                  * than what we could write here.
 649                  */
 650                 setup_git_directory();
 651         }
 652
 653         parse_treeish_arg(argv, &args, prefix, remote);
 654         parse_pathspec_arg(argv + 1, &args);
 655
 656         rc = ar->write_archive(ar, &args);
 657
 658         string_list_clear_func(&args.extra_files, extra_file_info_clear);
 659         free(args.refname);
 660
 661         return rc;
 662 }
 663
 664 static int match_extension(const char *filename, const char *ext)
 665 {
 666         int prefixlen = strlen(filename) - strlen(ext);
 667
 668         /*
 669          * We need 1 character for the '.', and 1 character to ensure that the
 670          * prefix is non-empty (k.e., we don't match .tar.gz with no actual
 671          * filename).
 672          */
 673         if (prefixlen < 2 || filename[prefixlen - 1] != '.')
 674                 return 0;
 675         return !strcmp(filename + prefixlen, ext);
 676 }
 677
 678 const char *archive_format_from_filename(const char *filename)
 679 {
 680         int i;
 681
 682         for (i = 0; i < nr_archivers; i++)
 683                 if (match_extension(filename, archivers[i]->name))
 684                         return archivers[i]->name;
 685         return NULL;
 686 }