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 #include "quote.h"
  13
  14 static char const * const archive_usage[] = {
  15         N_("git archive [<options>] <tree-ish> [<path>...]"),
  16         "git archive --list",
  17         N_("git archive --remote <repo> [--exec <cmd>] [<options>] <tree-ish> [<path>...]"),
  18         N_("git archive --remote <repo> [--exec <cmd>] --list"),
  19         NULL
  20 };
  21
  22 static const struct archiver **archivers;
  23 static int nr_archivers;
  24 static int alloc_archivers;
  25 static int remote_allow_unreachable;
  26
  27 void register_archiver(struct archiver *ar)
  28 {
  29         ALLOC_GROW(archivers, nr_archivers + 1, alloc_archivers);
  30         archivers[nr_archivers++] = ar;
  31 }
  32
  33 void init_archivers(void)
  34 {
  35         init_tar_archiver();
  36         init_zip_archiver();
  37 }
  38
  39 static void format_subst(const struct commit *commit,
  40                          const char *src, size_t len,
  41                          struct strbuf *buf, struct pretty_print_context *ctx)
  42 {
  43         char *to_free = NULL;
  44         struct strbuf fmt = STRBUF_INIT;
  45
  46         if (src == buf->buf)
  47                 to_free = strbuf_detach(buf, NULL);
  48         for (;;) {
  49                 const char *b, *c;
  50
  51                 b = memmem(src, len, "$Format:", 8);
  52                 if (!b)
  53                         break;
  54                 c = memchr(b + 8, '$', (src + len) - b - 8);
  55                 if (!c)
  56                         break;
  57
  58                 strbuf_reset(&fmt);
  59                 strbuf_add(&fmt, b + 8, c - b - 8);
  60
  61                 strbuf_add(buf, src, b - src);
  62                 format_commit_message(commit, fmt.buf, buf, ctx);
  63                 len -= c + 1 - src;
  64                 src  = c + 1;
  65         }
  66         strbuf_add(buf, src, len);
  67         strbuf_release(&fmt);
  68         free(to_free);
  69 }
  70
  71 static void *object_file_to_archive(const struct archiver_args *args,
  72                                     const char *path,
  73                                     const struct object_id *oid,
  74                                     unsigned int mode,
  75                                     enum object_type *type,
  76                                     unsigned long *sizep)
  77 {
  78         void *buffer;
  79         const struct commit *commit = args->convert ? args->commit : NULL;
  80         struct checkout_metadata meta;
  81
  82         init_checkout_metadata(&meta, args->refname,
  83                                args->commit_oid ? args->commit_oid :
  84                                (args->tree ? &args->tree->object.oid : NULL), oid);
  85
  86         path += args->baselen;
  87         buffer = read_object_file(oid, type, sizep);
  88         if (buffer && S_ISREG(mode)) {
  89                 struct strbuf buf = STRBUF_INIT;
  90                 size_t size = 0;
  91
  92                 strbuf_attach(&buf, buffer, *sizep, *sizep + 1);
  93                 convert_to_working_tree(args->repo->index, path, buf.buf, buf.len, &buf, &meta);
  94                 if (commit)
  95                         format_subst(commit, buf.buf, buf.len, &buf, args->pretty_ctx);
  96                 buffer = strbuf_detach(&buf, &size);
  97                 *sizep = size;
  98         }
  99
 100         return buffer;
 101 }
 102
 103 struct directory {
 104         struct directory *up;
 105         struct object_id oid;
 106         int baselen, len;
 107         unsigned mode;
 108         char path[FLEX_ARRAY];
 109 };
 110
 111 struct archiver_context {
 112         struct archiver_args *args;
 113         write_archive_entry_fn_t write_entry;
 114         struct directory *bottom;
 115 };
 116
 117 static const struct attr_check *get_archive_attrs(struct index_state *istate,
 118                                                   const char *path)
 119 {
 120         static struct attr_check *check;
 121         if (!check)
 122                 check = attr_check_initl("export-ignore", "export-subst", NULL);
 123         git_check_attr(istate, path, check);
 124         return check;
 125 }
 126
 127 static int check_attr_export_ignore(const struct attr_check *check)
 128 {
 129         return check && ATTR_TRUE(check->items[0].value);
 130 }
 131
 132 static int check_attr_export_subst(const struct attr_check *check)
 133 {
 134         return check && ATTR_TRUE(check->items[1].value);
 135 }
 136
 137 static int write_archive_entry(const struct object_id *oid, const char *base,
 138                 int baselen, const char *filename, unsigned mode,
 139                 void *context)
 140 {
 141         static struct strbuf path = STRBUF_INIT;
 142         struct archiver_context *c = context;
 143         struct archiver_args *args = c->args;
 144         write_archive_entry_fn_t write_entry = c->write_entry;
 145         int err;
 146         const char *path_without_prefix;
 147         unsigned long size;
 148         void *buffer;
 149         enum object_type type;
 150
 151         args->convert = 0;
 152         strbuf_reset(&path);
 153         strbuf_grow(&path, PATH_MAX);
 154         strbuf_add(&path, args->base, args->baselen);
 155         strbuf_add(&path, base, baselen);
 156         strbuf_addstr(&path, filename);
 157         if (S_ISDIR(mode) || S_ISGITLINK(mode))
 158                 strbuf_addch(&path, '/');
 159         path_without_prefix = path.buf + args->baselen;
 160
 161         if (!S_ISDIR(mode)) {
 162                 const struct attr_check *check;
 163                 check = get_archive_attrs(args->repo->index, path_without_prefix);
 164                 if (check_attr_export_ignore(check))
 165                         return 0;
 166                 args->convert = check_attr_export_subst(check);
 167         }
 168
 169         if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
 170                 if (args->verbose)
 171                         fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
 172                 err = write_entry(args, oid, path.buf, path.len, mode, NULL, 0);
 173                 if (err)
 174                         return err;
 175                 return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0);
 176         }
 177
 178         if (args->verbose)
 179                 fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
 180
 181         /* Stream it? */
 182         if (S_ISREG(mode) && !args->convert &&
 183             oid_object_info(args->repo, oid, &size) == OBJ_BLOB &&
 184             size > big_file_threshold)
 185                 return write_entry(args, oid, path.buf, path.len, mode, NULL, size);
 186
 187         buffer = object_file_to_archive(args, path.buf, oid, mode, &type, &size);
 188         if (!buffer)
 189                 return error(_("cannot read '%s'"), oid_to_hex(oid));
 190         err = write_entry(args, oid, path.buf, path.len, mode, buffer, size);
 191         free(buffer);
 192         return err;
 193 }
 194
 195 static void queue_directory(const struct object_id *oid,
 196                 struct strbuf *base, const char *filename,
 197                 unsigned mode, struct archiver_context *c)
 198 {
 199         struct directory *d;
 200         size_t len = st_add4(base->len, 1, strlen(filename), 1);
 201         d = xmalloc(st_add(sizeof(*d), len));
 202         d->up      = c->bottom;
 203         d->baselen = base->len;
 204         d->mode    = mode;
 205         c->bottom  = d;
 206         d->len = xsnprintf(d->path, len, "%.*s%s/", (int)base->len, base->buf, filename);
 207         oidcpy(&d->oid, oid);
 208 }
 209
 210 static int write_directory(struct archiver_context *c)
 211 {
 212         struct directory *d = c->bottom;
 213         int ret;
 214
 215         if (!d)
 216                 return 0;
 217         c->bottom = d->up;
 218         d->path[d->len - 1] = '\0'; /* no trailing slash */
 219         ret =
 220                 write_directory(c) ||
 221                 write_archive_entry(&d->oid, d->path, d->baselen,
 222                                     d->path + d->baselen, d->mode,
 223                                     c) != READ_TREE_RECURSIVE;
 224         free(d);
 225         return ret ? -1 : 0;
 226 }
 227
 228 static int queue_or_write_archive_entry(const struct object_id *oid,
 229                 struct strbuf *base, const char *filename,
 230                 unsigned mode, void *context)
 231 {
 232         struct archiver_context *c = context;
 233
 234         while (c->bottom &&
 235                !(base->len >= c->bottom->len &&
 236                  !strncmp(base->buf, c->bottom->path, c->bottom->len))) {
 237                 struct directory *next = c->bottom->up;
 238                 free(c->bottom);
 239                 c->bottom = next;
 240         }
 241
 242         if (S_ISDIR(mode)) {
 243                 size_t baselen = base->len;
 244                 const struct attr_check *check;
 245
 246                 /* Borrow base, but restore its original value when done. */
 247                 strbuf_addstr(base, filename);
 248                 strbuf_addch(base, '/');
 249                 check = get_archive_attrs(c->args->repo->index, base->buf);
 250                 strbuf_setlen(base, baselen);
 251
 252                 if (check_attr_export_ignore(check))
 253                         return 0;
 254                 queue_directory(oid, base, filename, mode, c);
 255                 return READ_TREE_RECURSIVE;
 256         }
 257
 258         if (write_directory(c))
 259                 return -1;
 260         return write_archive_entry(oid, base->buf, base->len, filename, mode,
 261                                    context);
 262 }
 263
 264 struct extra_file_info {
 265         char *base;
 266         struct stat stat;
 267         void *content;
 268 };
 269
 270 int write_archive_entries(struct archiver_args *args,
 271                 write_archive_entry_fn_t write_entry)
 272 {
 273         struct archiver_context context;
 274         struct unpack_trees_options opts;
 275         struct tree_desc t;
 276         int err;
 277         struct strbuf path_in_archive = STRBUF_INIT;
 278         struct strbuf content = STRBUF_INIT;
 279         struct object_id fake_oid;
 280         int i;
 281
 282         oidcpy(&fake_oid, null_oid());
 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                 if (!info->content) {
 337                         strbuf_reset(&path_in_archive);
 338                         if (info->base)
 339                                 strbuf_addstr(&path_in_archive, info->base);
 340                         strbuf_addstr(&path_in_archive, basename(path));
 341
 342                         strbuf_reset(&content);
 343                         if (strbuf_read_file(&content, path, info->stat.st_size) < 0)
 344                                 err = error_errno(_("cannot read '%s'"), path);
 345                         else
 346                                 err = write_entry(args, &fake_oid, path_in_archive.buf,
 347                                                   path_in_archive.len,
 348                                                   canon_mode(info->stat.st_mode),
 349                                                   content.buf, content.len);
 350                 } else {
 351                         err = write_entry(args, &fake_oid,
 352                                           path, strlen(path),
 353                                           canon_mode(info->stat.st_mode),
 354                                           info->content, info->stat.st_size);
 355                 }
 356
 357                 if (err)
 358                         break;
 359         }
 360         strbuf_release(&path_in_archive);
 361         strbuf_release(&content);
 362
 363         return err;
 364 }
 365
 366 static const struct archiver *lookup_archiver(const char *name)
 367 {
 368         int i;
 369
 370         if (!name)
 371                 return NULL;
 372
 373         for (i = 0; i < nr_archivers; i++) {
 374                 if (!strcmp(name, archivers[i]->name))
 375                         return archivers[i];
 376         }
 377         return NULL;
 378 }
 379
 380 struct path_exists_context {
 381         struct pathspec pathspec;
 382         struct archiver_args *args;
 383 };
 384
 385 static int reject_entry(const struct object_id *oid UNUSED,
 386                         struct strbuf *base,
 387                         const char *filename, unsigned mode,
 388                         void *context)
 389 {
 390         int ret = -1;
 391         struct path_exists_context *ctx = context;
 392
 393         if (S_ISDIR(mode)) {
 394                 struct strbuf sb = STRBUF_INIT;
 395                 strbuf_addbuf(&sb, base);
 396                 strbuf_addstr(&sb, filename);
 397                 if (!match_pathspec(ctx->args->repo->index,
 398                                     &ctx->pathspec,
 399                                     sb.buf, sb.len, 0, NULL, 1))
 400                         ret = READ_TREE_RECURSIVE;
 401                 strbuf_release(&sb);
 402         }
 403         return ret;
 404 }
 405
 406 static int path_exists(struct archiver_args *args, const char *path)
 407 {
 408         const char *paths[] = { path, NULL };
 409         struct path_exists_context ctx;
 410         int ret;
 411
 412         ctx.args = args;
 413         parse_pathspec(&ctx.pathspec, 0, 0, "", paths);
 414         ctx.pathspec.recursive = 1;
 415         ret = read_tree(args->repo, args->tree,
 416                         &ctx.pathspec,
 417                         reject_entry, &ctx);
 418         clear_pathspec(&ctx.pathspec);
 419         return ret != 0;
 420 }
 421
 422 static void parse_pathspec_arg(const char **pathspec,
 423                 struct archiver_args *ar_args)
 424 {
 425         /*
 426          * must be consistent with parse_pathspec in path_exists()
 427          * Also if pathspec patterns are dependent, we're in big
 428          * trouble as we test each one separately
 429          */
 430         parse_pathspec(&ar_args->pathspec, 0,
 431                        PATHSPEC_PREFER_FULL,
 432                        "", pathspec);
 433         ar_args->pathspec.recursive = 1;
 434         if (pathspec) {
 435                 while (*pathspec) {
 436                         if (**pathspec && !path_exists(ar_args, *pathspec))
 437                                 die(_("pathspec '%s' did not match any files"), *pathspec);
 438                         pathspec++;
 439                 }
 440         }
 441 }
 442
 443 static void parse_treeish_arg(const char **argv,
 444                 struct archiver_args *ar_args, const char *prefix,
 445                 int remote)
 446 {
 447         const char *name = argv[0];
 448         const struct object_id *commit_oid;
 449         time_t archive_time;
 450         struct tree *tree;
 451         const struct commit *commit;
 452         struct object_id oid;
 453         char *ref = NULL;
 454
 455         /* Remotes are only allowed to fetch actual refs */
 456         if (remote && !remote_allow_unreachable) {
 457                 const char *colon = strchrnul(name, ':');
 458                 int refnamelen = colon - name;
 459
 460                 if (!dwim_ref(name, refnamelen, &oid, &ref, 0))
 461                         die(_("no such ref: %.*s"), refnamelen, name);
 462         } else {
 463                 dwim_ref(name, strlen(name), &oid, &ref, 0);
 464         }
 465
 466         if (get_oid(name, &oid))
 467                 die(_("not a valid object name: %s"), name);
 468
 469         commit = lookup_commit_reference_gently(ar_args->repo, &oid, 1);
 470         if (commit) {
 471                 commit_oid = &commit->object.oid;
 472                 archive_time = commit->date;
 473         } else {
 474                 commit_oid = NULL;
 475                 archive_time = time(NULL);
 476         }
 477
 478         tree = parse_tree_indirect(&oid);
 479         if (!tree)
 480                 die(_("not a tree object: %s"), oid_to_hex(&oid));
 481
 482         if (prefix) {
 483                 struct object_id tree_oid;
 484                 unsigned short mode;
 485                 int err;
 486
 487                 err = get_tree_entry(ar_args->repo,
 488                                      &tree->object.oid,
 489                                      prefix, &tree_oid,
 490                                      &mode);
 491                 if (err || !S_ISDIR(mode))
 492                         die(_("current working directory is untracked"));
 493
 494                 tree = parse_tree_indirect(&tree_oid);
 495         }
 496         ar_args->refname = ref;
 497         ar_args->tree = tree;
 498         ar_args->commit_oid = commit_oid;
 499         ar_args->commit = commit;
 500         ar_args->time = archive_time;
 501 }
 502
 503 static void extra_file_info_clear(void *util, const char *str)
 504 {
 505         struct extra_file_info *info = util;
 506         free(info->base);
 507         free(info->content);
 508         free(info);
 509 }
 510
 511 static int add_file_cb(const struct option *opt, const char *arg, int unset)
 512 {
 513         struct archiver_args *args = opt->value;
 514         const char **basep = (const char **)opt->defval;
 515         const char *base = *basep;
 516         char *path;
 517         struct string_list_item *item;
 518         struct extra_file_info *info;
 519
 520         if (unset) {
 521                 string_list_clear_func(&args->extra_files,
 522                                        extra_file_info_clear);
 523                 return 0;
 524         }
 525
 526         if (!arg)
 527                 return -1;
 528
 529         info = xmalloc(sizeof(*info));
 530         info->base = xstrdup_or_null(base);
 531
 532         if (!strcmp(opt->long_name, "add-file")) {
 533                 path = prefix_filename(args->prefix, arg);
 534                 if (stat(path, &info->stat))
 535                         die(_("File not found: %s"), path);
 536                 if (!S_ISREG(info->stat.st_mode))
 537                         die(_("Not a regular file: %s"), path);
 538                 info->content = NULL; /* read the file later */
 539         } else if (!strcmp(opt->long_name, "add-virtual-file")) {
 540                 struct strbuf buf = STRBUF_INIT;
 541                 const char *p = arg;
 542
 543                 if (*p != '"')
 544                         p = strchr(p, ':');
 545                 else if (unquote_c_style(&buf, p, &p) < 0)
 546                         die(_("unclosed quote: '%s'"), arg);
 547
 548                 if (!p || *p != ':')
 549                         die(_("missing colon: '%s'"), arg);
 550
 551                 if (p == arg)
 552                         die(_("empty file name: '%s'"), arg);
 553
 554                 path = buf.len ?
 555                         strbuf_detach(&buf, NULL) : xstrndup(arg, p - arg);
 556
 557                 if (args->prefix) {
 558                         char *save = path;
 559                         path = prefix_filename(args->prefix, path);
 560                         free(save);
 561                 }
 562                 memset(&info->stat, 0, sizeof(info->stat));
 563                 info->stat.st_mode = S_IFREG | 0644;
 564                 info->content = xstrdup(p + 1);
 565                 info->stat.st_size = strlen(info->content);
 566         } else {
 567                 BUG("add_file_cb() called for %s", opt->long_name);
 568         }
 569         item = string_list_append_nodup(&args->extra_files, path);
 570         item->util = info;
 571
 572         return 0;
 573 }
 574
 575 static int number_callback(const struct option *opt, const char *arg, int unset)
 576 {
 577         BUG_ON_OPT_NEG(unset);
 578         *(int *)opt->value = strtol(arg, NULL, 10);
 579         return 0;
 580 }
 581
 582 static int parse_archive_args(int argc, const char **argv,
 583                 const struct archiver **ar, struct archiver_args *args,
 584                 const char *name_hint, int is_remote)
 585 {
 586         const char *format = NULL;
 587         const char *base = NULL;
 588         const char *remote = NULL;
 589         const char *exec = NULL;
 590         const char *output = NULL;
 591         int compression_level = -1;
 592         int verbose = 0;
 593         int i;
 594         int list = 0;
 595         int worktree_attributes = 0;
 596         struct option opts[] = {
 597                 OPT_GROUP(""),
 598                 OPT_STRING(0, "format", &format, N_("fmt"), N_("archive format")),
 599                 OPT_STRING(0, "prefix", &base, N_("prefix"),
 600                         N_("prepend prefix to each pathname in the archive")),
 601                 { OPTION_CALLBACK, 0, "add-file", args, N_("file"),
 602                   N_("add untracked file to archive"), 0, add_file_cb,
 603                   (intptr_t)&base },
 604                 { OPTION_CALLBACK, 0, "add-virtual-file", args,
 605                   N_("path:content"), N_("add untracked file to archive"), 0,
 606                   add_file_cb, (intptr_t)&base },
 607                 OPT_STRING('o', "output", &output, N_("file"),
 608                         N_("write the archive to this file")),
 609                 OPT_BOOL(0, "worktree-attributes", &worktree_attributes,
 610                         N_("read .gitattributes in working directory")),
 611                 OPT__VERBOSE(&verbose, N_("report archived files on stderr")),
 612                 OPT_NUMBER_CALLBACK(&compression_level,
 613                         N_("set compression level"), number_callback),
 614                 OPT_GROUP(""),
 615                 OPT_BOOL('l', "list", &list,
 616                         N_("list supported archive formats")),
 617                 OPT_GROUP(""),
 618                 OPT_STRING(0, "remote", &remote, N_("repo"),
 619                         N_("retrieve the archive from remote repository <repo>")),
 620                 OPT_STRING(0, "exec", &exec, N_("command"),
 621                         N_("path to the remote git-upload-archive command")),
 622                 OPT_END()
 623         };
 624
 625         argc = parse_options(argc, argv, NULL, opts, archive_usage, 0);
 626
 627         if (remote)
 628                 die(_("Unexpected option --remote"));
 629         if (exec)
 630                 die(_("the option '%s' requires '%s'"), "--exec", "--remote");
 631         if (output)
 632                 die(_("Unexpected option --output"));
 633         if (is_remote && args->extra_files.nr)
 634                 die(_("options '%s' and '%s' cannot be used together"), "--add-file", "--remote");
 635
 636         if (!base)
 637                 base = "";
 638
 639         if (list) {
 640                 for (i = 0; i < nr_archivers; i++)
 641                         if (!is_remote || archivers[i]->flags & ARCHIVER_REMOTE)
 642                                 printf("%s\n", archivers[i]->name);
 643                 exit(0);
 644         }
 645
 646         if (!format && name_hint)
 647                 format = archive_format_from_filename(name_hint);
 648         if (!format)
 649                 format = "tar";
 650
 651         /* We need at least one parameter -- tree-ish */
 652         if (argc < 1)
 653                 usage_with_options(archive_usage, opts);
 654         *ar = lookup_archiver(format);
 655         if (!*ar || (is_remote && !((*ar)->flags & ARCHIVER_REMOTE)))
 656                 die(_("Unknown archive format '%s'"), format);
 657
 658         args->compression_level = Z_DEFAULT_COMPRESSION;
 659         if (compression_level != -1) {
 660                 int levels_ok = (*ar)->flags & ARCHIVER_WANT_COMPRESSION_LEVELS;
 661                 int high_ok = (*ar)->flags & ARCHIVER_HIGH_COMPRESSION_LEVELS;
 662                 if (levels_ok && (compression_level <= 9 || high_ok))
 663                         args->compression_level = compression_level;
 664                 else {
 665                         die(_("Argument not supported for format '%s': -%d"),
 666                                         format, compression_level);
 667                 }
 668         }
 669         args->verbose = verbose;
 670         args->base = base;
 671         args->baselen = strlen(base);
 672         args->worktree_attributes = worktree_attributes;
 673
 674         return argc;
 675 }
 676
 677 int write_archive(int argc, const char **argv, const char *prefix,
 678                   struct repository *repo,
 679                   const char *name_hint, int remote)
 680 {
 681         const struct archiver *ar = NULL;
 682         struct pretty_print_describe_status describe_status = {0};
 683         struct pretty_print_context ctx = {0};
 684         struct archiver_args args;
 685         int rc;
 686
 687         git_config_get_bool("uploadarchive.allowunreachable", &remote_allow_unreachable);
 688         git_config(git_default_config, NULL);
 689
 690         describe_status.max_invocations = 1;
 691         ctx.date_mode.type = DATE_NORMAL;
 692         ctx.abbrev = DEFAULT_ABBREV;
 693         ctx.describe_status = &describe_status;
 694         args.pretty_ctx = &ctx;
 695         args.repo = repo;
 696         args.prefix = prefix;
 697         string_list_init_dup(&args.extra_files);
 698         argc = parse_archive_args(argc, argv, &ar, &args, name_hint, remote);
 699         if (!startup_info->have_repository) {
 700                 /*
 701                  * We know this will die() with an error, so we could just
 702                  * die ourselves; but its error message will be more specific
 703                  * than what we could write here.
 704                  */
 705                 setup_git_directory();
 706         }
 707
 708         parse_treeish_arg(argv, &args, prefix, remote);
 709         parse_pathspec_arg(argv + 1, &args);
 710
 711         rc = ar->write_archive(ar, &args);
 712
 713         string_list_clear_func(&args.extra_files, extra_file_info_clear);
 714         free(args.refname);
 715
 716         return rc;
 717 }
 718
 719 static int match_extension(const char *filename, const char *ext)
 720 {
 721         int prefixlen = strlen(filename) - strlen(ext);
 722
 723         /*
 724          * We need 1 character for the '.', and 1 character to ensure that the
 725          * prefix is non-empty (k.e., we don't match .tar.gz with no actual
 726          * filename).
 727          */
 728         if (prefixlen < 2 || filename[prefixlen - 1] != '.')
 729                 return 0;
 730         return !strcmp(filename + prefixlen, ext);
 731 }
 732
 733 const char *archive_format_from_filename(const char *filename)
 734 {
 735         int i;
 736
 737         for (i = 0; i < nr_archivers; i++)
 738                 if (match_extension(filename, archivers[i]->name))
 739                         return archivers[i]->name;
 740         return NULL;
 741 }