archive.c

   1 #include "git-compat-util.h"
   2 #include "alloc.h"
   3 #include "config.h"
   4 #include "refs.h"
   5 #include "object-store.h"
   6 #include "commit.h"
   7 #include "tree-walk.h"
   8 #include "attr.h"
   9 #include "archive.h"
  10 #include "parse-options.h"
  11 #include "unpack-trees.h"
  12 #include "dir.h"
  13 #include "quote.h"
  14
  15 static char const * const archive_usage[] = {
  16         N_("git archive [<options>] <tree-ish> [<path>...]"),
  17         "git archive --list",
  18         N_("git archive --remote <repo> [--exec <cmd>] [<options>] <tree-ish> [<path>...]"),
  19         N_("git archive --remote <repo> [--exec <cmd>] --list"),
  20         NULL
  21 };
  22
  23 static const struct archiver **archivers;
  24 static int nr_archivers;
  25 static int alloc_archivers;
  26 static int remote_allow_unreachable;
  27
  28 void register_archiver(struct archiver *ar)
  29 {
  30         ALLOC_GROW(archivers, nr_archivers + 1, alloc_archivers);
  31         archivers[nr_archivers++] = ar;
  32 }
  33
  34 void init_archivers(void)
  35 {
  36         init_tar_archiver();
  37         init_zip_archiver();
  38 }
  39
  40 static void format_subst(const struct commit *commit,
  41                          const char *src, size_t len,
  42                          struct strbuf *buf, struct pretty_print_context *ctx)
  43 {
  44         char *to_free = NULL;
  45         struct strbuf fmt = STRBUF_INIT;
  46
  47         if (src == buf->buf)
  48                 to_free = strbuf_detach(buf, NULL);
  49         for (;;) {
  50                 const char *b, *c;
  51
  52                 b = memmem(src, len, "$Format:", 8);
  53                 if (!b)
  54                         break;
  55                 c = memchr(b + 8, '$', (src + len) - b - 8);
  56                 if (!c)
  57                         break;
  58
  59                 strbuf_reset(&fmt);
  60                 strbuf_add(&fmt, b + 8, c - b - 8);
  61
  62                 strbuf_add(buf, src, b - src);
  63                 format_commit_message(commit, fmt.buf, buf, ctx);
  64                 len -= c + 1 - src;
  65                 src  = c + 1;
  66         }
  67         strbuf_add(buf, src, len);
  68         strbuf_release(&fmt);
  69         free(to_free);
  70 }
  71
  72 static void *object_file_to_archive(const struct archiver_args *args,
  73                                     const char *path,
  74                                     const struct object_id *oid,
  75                                     unsigned int mode,
  76                                     enum object_type *type,
  77                                     unsigned long *sizep)
  78 {
  79         void *buffer;
  80         const struct commit *commit = args->convert ? args->commit : NULL;
  81         struct checkout_metadata meta;
  82
  83         init_checkout_metadata(&meta, args->refname,
  84                                args->commit_oid ? args->commit_oid :
  85                                (args->tree ? &args->tree->object.oid : NULL), oid);
  86
  87         path += args->baselen;
  88         buffer = read_object_file(oid, type, sizep);
  89         if (buffer && S_ISREG(mode)) {
  90                 struct strbuf buf = STRBUF_INIT;
  91                 size_t size = 0;
  92
  93                 strbuf_attach(&buf, buffer, *sizep, *sizep + 1);
  94                 convert_to_working_tree(args->repo->index, path, buf.buf, buf.len, &buf, &meta);
  95                 if (commit)
  96                         format_subst(commit, buf.buf, buf.len, &buf, args->pretty_ctx);
  97                 buffer = strbuf_detach(&buf, &size);
  98                 *sizep = size;
  99         }
 100
 101         return buffer;
 102 }
 103
 104 struct directory {
 105         struct directory *up;
 106         struct object_id oid;
 107         int baselen, len;
 108         unsigned mode;
 109         char path[FLEX_ARRAY];
 110 };
 111
 112 struct archiver_context {
 113         struct archiver_args *args;
 114         write_archive_entry_fn_t write_entry;
 115         struct directory *bottom;
 116 };
 117
 118 static const struct attr_check *get_archive_attrs(struct index_state *istate,
 119                                                   const char *path)
 120 {
 121         static struct attr_check *check;
 122         if (!check)
 123                 check = attr_check_initl("export-ignore", "export-subst", NULL);
 124         git_check_attr(istate, NULL, path, check);
 125         return check;
 126 }
 127
 128 static int check_attr_export_ignore(const struct attr_check *check)
 129 {
 130         return check && ATTR_TRUE(check->items[0].value);
 131 }
 132
 133 static int check_attr_export_subst(const struct attr_check *check)
 134 {
 135         return check && ATTR_TRUE(check->items[1].value);
 136 }
 137
 138 static int write_archive_entry(const struct object_id *oid, const char *base,
 139                 int baselen, const char *filename, unsigned mode,
 140                 void *context)
 141 {
 142         static struct strbuf path = STRBUF_INIT;
 143         struct archiver_context *c = context;
 144         struct archiver_args *args = c->args;
 145         write_archive_entry_fn_t write_entry = c->write_entry;
 146         int err;
 147         const char *path_without_prefix;
 148         unsigned long size;
 149         void *buffer;
 150         enum object_type type;
 151
 152         args->convert = 0;
 153         strbuf_reset(&path);
 154         strbuf_grow(&path, PATH_MAX);
 155         strbuf_add(&path, args->base, args->baselen);
 156         strbuf_add(&path, base, baselen);
 157         strbuf_addstr(&path, filename);
 158         if (S_ISDIR(mode) || S_ISGITLINK(mode))
 159                 strbuf_addch(&path, '/');
 160         path_without_prefix = path.buf + args->baselen;
 161
 162         if (!S_ISDIR(mode)) {
 163                 const struct attr_check *check;
 164                 check = get_archive_attrs(args->repo->index, path_without_prefix);
 165                 if (check_attr_export_ignore(check))
 166                         return 0;
 167                 args->convert = check_attr_export_subst(check);
 168         }
 169
 170         if (args->verbose)
 171                 fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
 172
 173         if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
 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         /* Stream it? */
 181         if (S_ISREG(mode) && !args->convert &&
 182             oid_object_info(args->repo, oid, &size) == OBJ_BLOB &&
 183             size > big_file_threshold)
 184                 return write_entry(args, oid, path.buf, path.len, mode, NULL, size);
 185
 186         buffer = object_file_to_archive(args, path.buf, oid, mode, &type, &size);
 187         if (!buffer)
 188                 return error(_("cannot read '%s'"), oid_to_hex(oid));
 189         err = write_entry(args, oid, path.buf, path.len, mode, buffer, size);
 190         free(buffer);
 191         return err;
 192 }
 193
 194 static void queue_directory(const struct object_id *oid,
 195                 struct strbuf *base, const char *filename,
 196                 unsigned mode, struct archiver_context *c)
 197 {
 198         struct directory *d;
 199         size_t len = st_add4(base->len, 1, strlen(filename), 1);
 200         d = xmalloc(st_add(sizeof(*d), len));
 201         d->up      = c->bottom;
 202         d->baselen = base->len;
 203         d->mode    = mode;
 204         c->bottom  = d;
 205         d->len = xsnprintf(d->path, len, "%.*s%s/", (int)base->len, base->buf, filename);
 206         oidcpy(&d->oid, oid);
 207 }
 208
 209 static int write_directory(struct archiver_context *c)
 210 {
 211         struct directory *d = c->bottom;
 212         int ret;
 213
 214         if (!d)
 215                 return 0;
 216         c->bottom = d->up;
 217         d->path[d->len - 1] = '\0'; /* no trailing slash */
 218         ret =
 219                 write_directory(c) ||
 220                 write_archive_entry(&d->oid, d->path, d->baselen,
 221                                     d->path + d->baselen, d->mode,
 222                                     c) != READ_TREE_RECURSIVE;
 223         free(d);
 224         return ret ? -1 : 0;
 225 }
 226
 227 static int queue_or_write_archive_entry(const struct object_id *oid,
 228                 struct strbuf *base, const char *filename,
 229                 unsigned mode, void *context)
 230 {
 231         struct archiver_context *c = context;
 232
 233         while (c->bottom &&
 234                !(base->len >= c->bottom->len &&
 235                  !strncmp(base->buf, c->bottom->path, c->bottom->len))) {
 236                 struct directory *next = c->bottom->up;
 237                 free(c->bottom);
 238                 c->bottom = next;
 239         }
 240
 241         if (S_ISDIR(mode)) {
 242                 size_t baselen = base->len;
 243                 const struct attr_check *check;
 244
 245                 /* Borrow base, but restore its original value when done. */
 246                 strbuf_addstr(base, filename);
 247                 strbuf_addch(base, '/');
 248                 check = get_archive_attrs(c->args->repo->index, base->buf);
 249                 strbuf_setlen(base, baselen);
 250
 251                 if (check_attr_export_ignore(check))
 252                         return 0;
 253                 queue_directory(oid, base, filename, mode, c);
 254                 return READ_TREE_RECURSIVE;
 255         }
 256
 257         if (write_directory(c))
 258                 return -1;
 259         return write_archive_entry(oid, base->buf, base->len, filename, mode,
 260                                    context);
 261 }
 262
 263 struct extra_file_info {
 264         char *base;
 265         struct stat stat;
 266         void *content;
 267 };
 268
 269 int write_archive_entries(struct archiver_args *args,
 270                 write_archive_entry_fn_t write_entry)
 271 {
 272         struct archiver_context context;
 273         struct unpack_trees_options opts;
 274         struct tree_desc t;
 275         int err;
 276         struct strbuf path_in_archive = STRBUF_INIT;
 277         struct strbuf content = STRBUF_INIT;
 278         struct object_id fake_oid;
 279         int i;
 280
 281         oidcpy(&fake_oid, null_oid());
 282
 283         if (args->baselen > 0 && args->base[args->baselen - 1] == '/') {
 284                 size_t len = args->baselen;
 285
 286                 while (len > 1 && args->base[len - 2] == '/')
 287                         len--;
 288                 if (args->verbose)
 289                         fprintf(stderr, "%.*s\n", (int)len, args->base);
 290                 err = write_entry(args, &args->tree->object.oid, args->base,
 291                                   len, 040777, NULL, 0);
 292                 if (err)
 293                         return err;
 294         }
 295
 296         memset(&context, 0, sizeof(context));
 297         context.args = args;
 298         context.write_entry = write_entry;
 299
 300         /*
 301          * Setup index and instruct attr to read index only
 302          */
 303         if (!args->worktree_attributes) {
 304                 memset(&opts, 0, sizeof(opts));
 305                 opts.index_only = 1;
 306                 opts.head_idx = -1;
 307                 opts.src_index = args->repo->index;
 308                 opts.dst_index = args->repo->index;
 309                 opts.fn = oneway_merge;
 310                 init_tree_desc(&t, args->tree->buffer, args->tree->size);
 311                 if (unpack_trees(1, &t, &opts))
 312                         return -1;
 313                 git_attr_set_direction(GIT_ATTR_INDEX);
 314         }
 315
 316         err = read_tree(args->repo, args->tree,
 317                         &args->pathspec,
 318                         queue_or_write_archive_entry,
 319                         &context);
 320         if (err == READ_TREE_RECURSIVE)
 321                 err = 0;
 322         while (context.bottom) {
 323                 struct directory *next = context.bottom->up;
 324                 free(context.bottom);
 325                 context.bottom = next;
 326         }
 327
 328         for (i = 0; i < args->extra_files.nr; i++) {
 329                 struct string_list_item *item = args->extra_files.items + i;
 330                 char *path = item->string;
 331                 struct extra_file_info *info = item->util;
 332
 333                 put_be64(fake_oid.hash, i + 1);
 334
 335                 if (!info->content) {
 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(_("cannot read '%s'"), path);
 344                         else
 345                                 err = write_entry(args, &fake_oid, path_in_archive.buf,
 346                                                   path_in_archive.len,
 347                                                   canon_mode(info->stat.st_mode),
 348                                                   content.buf, content.len);
 349                 } else {
 350                         err = write_entry(args, &fake_oid,
 351                                           path, strlen(path),
 352                                           canon_mode(info->stat.st_mode),
 353                                           info->content, info->stat.st_size);
 354                 }
 355
 356                 if (err)
 357                         break;
 358         }
 359         strbuf_release(&path_in_archive);
 360         strbuf_release(&content);
 361
 362         return err;
 363 }
 364
 365 static const struct archiver *lookup_archiver(const char *name)
 366 {
 367         int i;
 368
 369         if (!name)
 370                 return NULL;
 371
 372         for (i = 0; i < nr_archivers; i++) {
 373                 if (!strcmp(name, archivers[i]->name))
 374                         return archivers[i];
 375         }
 376         return NULL;
 377 }
 378
 379 struct path_exists_context {
 380         struct pathspec pathspec;
 381         struct archiver_args *args;
 382 };
 383
 384 static int reject_entry(const struct object_id *oid UNUSED,
 385                         struct strbuf *base,
 386                         const char *filename, unsigned mode,
 387                         void *context)
 388 {
 389         int ret = -1;
 390         struct path_exists_context *ctx = context;
 391
 392         if (S_ISDIR(mode)) {
 393                 struct strbuf sb = STRBUF_INIT;
 394                 strbuf_addbuf(&sb, base);
 395                 strbuf_addstr(&sb, filename);
 396                 if (!match_pathspec(ctx->args->repo->index,
 397                                     &ctx->pathspec,
 398                                     sb.buf, sb.len, 0, NULL, 1))
 399                         ret = READ_TREE_RECURSIVE;
 400                 strbuf_release(&sb);
 401         }
 402         return ret;
 403 }
 404
 405 static int path_exists(struct archiver_args *args, const char *path)
 406 {
 407         const char *paths[] = { path, NULL };
 408         struct path_exists_context ctx;
 409         int ret;
 410
 411         ctx.args = args;
 412         parse_pathspec(&ctx.pathspec, 0, 0, "", paths);
 413         ctx.pathspec.recursive = 1;
 414         ret = read_tree(args->repo, args->tree,
 415                         &ctx.pathspec,
 416                         reject_entry, &ctx);
 417         clear_pathspec(&ctx.pathspec);
 418         return ret != 0;
 419 }
 420
 421 static void parse_pathspec_arg(const char **pathspec,
 422                 struct archiver_args *ar_args)
 423 {
 424         /*
 425          * must be consistent with parse_pathspec in path_exists()
 426          * Also if pathspec patterns are dependent, we're in big
 427          * trouble as we test each one separately
 428          */
 429         parse_pathspec(&ar_args->pathspec, 0,
 430                        PATHSPEC_PREFER_FULL,
 431                        "", pathspec);
 432         ar_args->pathspec.recursive = 1;
 433         if (pathspec) {
 434                 while (*pathspec) {
 435                         if (**pathspec && !path_exists(ar_args, *pathspec))
 436                                 die(_("pathspec '%s' did not match any files"), *pathspec);
 437                         pathspec++;
 438                 }
 439         }
 440 }
 441
 442 static void parse_treeish_arg(const char **argv,
 443                 struct archiver_args *ar_args, const char *prefix,
 444                 int remote)
 445 {
 446         const char *name = argv[0];
 447         const struct object_id *commit_oid;
 448         time_t archive_time;
 449         struct tree *tree;
 450         const struct commit *commit;
 451         struct object_id oid;
 452         char *ref = NULL;
 453
 454         /* Remotes are only allowed to fetch actual refs */
 455         if (remote && !remote_allow_unreachable) {
 456                 const char *colon = strchrnul(name, ':');
 457                 int refnamelen = colon - name;
 458
 459                 if (!dwim_ref(name, refnamelen, &oid, &ref, 0))
 460                         die(_("no such ref: %.*s"), refnamelen, name);
 461         } else {
 462                 dwim_ref(name, strlen(name), &oid, &ref, 0);
 463         }
 464
 465         if (get_oid(name, &oid))
 466                 die(_("not a valid object name: %s"), name);
 467
 468         commit = lookup_commit_reference_gently(ar_args->repo, &oid, 1);
 469         if (commit) {
 470                 commit_oid = &commit->object.oid;
 471                 archive_time = commit->date;
 472         } else {
 473                 commit_oid = NULL;
 474                 archive_time = time(NULL);
 475         }
 476
 477         tree = parse_tree_indirect(&oid);
 478         if (!tree)
 479                 die(_("not a tree object: %s"), oid_to_hex(&oid));
 480
 481         if (prefix) {
 482                 struct object_id tree_oid;
 483                 unsigned short mode;
 484                 int err;
 485
 486                 err = get_tree_entry(ar_args->repo,
 487                                      &tree->object.oid,
 488                                      prefix, &tree_oid,
 489                                      &mode);
 490                 if (err || !S_ISDIR(mode))
 491                         die(_("current working directory is untracked"));
 492
 493                 tree = parse_tree_indirect(&tree_oid);
 494         }
 495         ar_args->refname = ref;
 496         ar_args->tree = tree;
 497         ar_args->commit_oid = commit_oid;
 498         ar_args->commit = commit;
 499         ar_args->time = archive_time;
 500 }
 501
 502 static void extra_file_info_clear(void *util, const char *str UNUSED)
 503 {
 504         struct extra_file_info *info = util;
 505         free(info->base);
 506         free(info->content);
 507         free(info);
 508 }
 509
 510 static int add_file_cb(const struct option *opt, const char *arg, int unset)
 511 {
 512         struct archiver_args *args = opt->value;
 513         const char **basep = (const char **)opt->defval;
 514         const char *base = *basep;
 515         char *path;
 516         struct string_list_item *item;
 517         struct extra_file_info *info;
 518
 519         if (unset) {
 520                 string_list_clear_func(&args->extra_files,
 521                                        extra_file_info_clear);
 522                 return 0;
 523         }
 524
 525         if (!arg)
 526                 return -1;
 527
 528         info = xmalloc(sizeof(*info));
 529         info->base = xstrdup_or_null(base);
 530
 531         if (!strcmp(opt->long_name, "add-file")) {
 532                 path = prefix_filename(args->prefix, arg);
 533                 if (stat(path, &info->stat))
 534                         die(_("File not found: %s"), path);
 535                 if (!S_ISREG(info->stat.st_mode))
 536                         die(_("Not a regular file: %s"), path);
 537                 info->content = NULL; /* read the file later */
 538         } else if (!strcmp(opt->long_name, "add-virtual-file")) {
 539                 struct strbuf buf = STRBUF_INIT;
 540                 const char *p = arg;
 541
 542                 if (*p != '"')
 543                         p = strchr(p, ':');
 544                 else if (unquote_c_style(&buf, p, &p) < 0)
 545                         die(_("unclosed quote: '%s'"), arg);
 546
 547                 if (!p || *p != ':')
 548                         die(_("missing colon: '%s'"), arg);
 549
 550                 if (p == arg)
 551                         die(_("empty file name: '%s'"), arg);
 552
 553                 path = buf.len ?
 554                         strbuf_detach(&buf, NULL) : xstrndup(arg, p - arg);
 555
 556                 if (args->prefix) {
 557                         char *save = path;
 558                         path = prefix_filename(args->prefix, path);
 559                         free(save);
 560                 }
 561                 memset(&info->stat, 0, sizeof(info->stat));
 562                 info->stat.st_mode = S_IFREG | 0644;
 563                 info->content = xstrdup(p + 1);
 564                 info->stat.st_size = strlen(info->content);
 565         } else {
 566                 BUG("add_file_cb() called for %s", opt->long_name);
 567         }
 568         item = string_list_append_nodup(&args->extra_files, path);
 569         item->util = info;
 570
 571         return 0;
 572 }
 573
 574 static int number_callback(const struct option *opt, const char *arg, int unset)
 575 {
 576         BUG_ON_OPT_NEG(unset);
 577         *(int *)opt->value = strtol(arg, NULL, 10);
 578         return 0;
 579 }
 580
 581 static int parse_archive_args(int argc, const char **argv,
 582                 const struct archiver **ar, struct archiver_args *args,
 583                 const char *name_hint, int is_remote)
 584 {
 585         const char *format = NULL;
 586         const char *base = NULL;
 587         const char *remote = NULL;
 588         const char *exec = NULL;
 589         const char *output = NULL;
 590         int compression_level = -1;
 591         int verbose = 0;
 592         int i;
 593         int list = 0;
 594         int worktree_attributes = 0;
 595         struct option opts[] = {
 596                 OPT_GROUP(""),
 597                 OPT_STRING(0, "format", &format, N_("fmt"), N_("archive format")),
 598                 OPT_STRING(0, "prefix", &base, N_("prefix"),
 599                         N_("prepend prefix to each pathname in the archive")),
 600                 { OPTION_CALLBACK, 0, "add-file", args, N_("file"),
 601                   N_("add untracked file to archive"), 0, add_file_cb,
 602                   (intptr_t)&base },
 603                 { OPTION_CALLBACK, 0, "add-virtual-file", args,
 604                   N_("path:content"), N_("add untracked file to archive"), 0,
 605                   add_file_cb, (intptr_t)&base },
 606                 OPT_STRING('o', "output", &output, N_("file"),
 607                         N_("write the archive to this file")),
 608                 OPT_BOOL(0, "worktree-attributes", &worktree_attributes,
 609                         N_("read .gitattributes in working directory")),
 610                 OPT__VERBOSE(&verbose, N_("report archived files on stderr")),
 611                 OPT_NUMBER_CALLBACK(&compression_level,
 612                         N_("set compression level"), number_callback),
 613                 OPT_GROUP(""),
 614                 OPT_BOOL('l', "list", &list,
 615                         N_("list supported archive formats")),
 616                 OPT_GROUP(""),
 617                 OPT_STRING(0, "remote", &remote, N_("repo"),
 618                         N_("retrieve the archive from remote repository <repo>")),
 619                 OPT_STRING(0, "exec", &exec, N_("command"),
 620                         N_("path to the remote git-upload-archive command")),
 621                 OPT_END()
 622         };
 623
 624         argc = parse_options(argc, argv, NULL, opts, archive_usage, 0);
 625
 626         if (remote)
 627                 die(_("Unexpected option --remote"));
 628         if (exec)
 629                 die(_("the option '%s' requires '%s'"), "--exec", "--remote");
 630         if (output)
 631                 die(_("Unexpected option --output"));
 632         if (is_remote && args->extra_files.nr)
 633                 die(_("options '%s' and '%s' cannot be used together"), "--add-file", "--remote");
 634
 635         if (!base)
 636                 base = "";
 637
 638         if (list) {
 639                 for (i = 0; i < nr_archivers; i++)
 640                         if (!is_remote || archivers[i]->flags & ARCHIVER_REMOTE)
 641                                 printf("%s\n", archivers[i]->name);
 642                 exit(0);
 643         }
 644
 645         if (!format && name_hint)
 646                 format = archive_format_from_filename(name_hint);
 647         if (!format)
 648                 format = "tar";
 649
 650         /* We need at least one parameter -- tree-ish */
 651         if (argc < 1)
 652                 usage_with_options(archive_usage, opts);
 653         *ar = lookup_archiver(format);
 654         if (!*ar || (is_remote && !((*ar)->flags & ARCHIVER_REMOTE)))
 655                 die(_("Unknown archive format '%s'"), format);
 656
 657         args->compression_level = Z_DEFAULT_COMPRESSION;
 658         if (compression_level != -1) {
 659                 int levels_ok = (*ar)->flags & ARCHIVER_WANT_COMPRESSION_LEVELS;
 660                 int high_ok = (*ar)->flags & ARCHIVER_HIGH_COMPRESSION_LEVELS;
 661                 if (levels_ok && (compression_level <= 9 || high_ok))
 662                         args->compression_level = compression_level;
 663                 else {
 664                         die(_("Argument not supported for format '%s': -%d"),
 665                                         format, compression_level);
 666                 }
 667         }
 668         args->verbose = verbose;
 669         args->base = base;
 670         args->baselen = strlen(base);
 671         args->worktree_attributes = worktree_attributes;
 672
 673         return argc;
 674 }
 675
 676 int write_archive(int argc, const char **argv, const char *prefix,
 677                   struct repository *repo,
 678                   const char *name_hint, int remote)
 679 {
 680         const struct archiver *ar = NULL;
 681         struct pretty_print_describe_status describe_status = {0};
 682         struct pretty_print_context ctx = {0};
 683         struct archiver_args args;
 684         int rc;
 685
 686         git_config_get_bool("uploadarchive.allowunreachable", &remote_allow_unreachable);
 687         git_config(git_default_config, NULL);
 688
 689         describe_status.max_invocations = 1;
 690         ctx.date_mode.type = DATE_NORMAL;
 691         ctx.abbrev = DEFAULT_ABBREV;
 692         ctx.describe_status = &describe_status;
 693         args.pretty_ctx = &ctx;
 694         args.repo = repo;
 695         args.prefix = prefix;
 696         string_list_init_dup(&args.extra_files);
 697         argc = parse_archive_args(argc, argv, &ar, &args, name_hint, remote);
 698         if (!startup_info->have_repository) {
 699                 /*
 700                  * We know this will die() with an error, so we could just
 701                  * die ourselves; but its error message will be more specific
 702                  * than what we could write here.
 703                  */
 704                 setup_git_directory();
 705         }
 706
 707         parse_treeish_arg(argv, &args, prefix, remote);
 708         parse_pathspec_arg(argv + 1, &args);
 709
 710         rc = ar->write_archive(ar, &args);
 711
 712         string_list_clear_func(&args.extra_files, extra_file_info_clear);
 713         free(args.refname);
 714         clear_pathspec(&args.pathspec);
 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 }