archive.c

   1 #include "git-compat-util.h"
   2 #include "abspath.h"
   3 #include "alloc.h"
   4 #include "config.h"
   5 #include "gettext.h"
   6 #include "hex.h"
   7 #include "refs.h"
   8 #include "object-store.h"
   9 #include "commit.h"
  10 #include "tree-walk.h"
  11 #include "attr.h"
  12 #include "archive.h"
  13 #include "parse-options.h"
  14 #include "unpack-trees.h"
  15 #include "dir.h"
  16 #include "quote.h"
  17
  18 static char const * const archive_usage[] = {
  19         N_("git archive [<options>] <tree-ish> [<path>...]"),
  20         "git archive --list",
  21         N_("git archive --remote <repo> [--exec <cmd>] [<options>] <tree-ish> [<path>...]"),
  22         N_("git archive --remote <repo> [--exec <cmd>] --list"),
  23         NULL
  24 };
  25
  26 static const struct archiver **archivers;
  27 static int nr_archivers;
  28 static int alloc_archivers;
  29 static int remote_allow_unreachable;
  30
  31 void register_archiver(struct archiver *ar)
  32 {
  33         ALLOC_GROW(archivers, nr_archivers + 1, alloc_archivers);
  34         archivers[nr_archivers++] = ar;
  35 }
  36
  37 void init_archivers(void)
  38 {
  39         init_tar_archiver();
  40         init_zip_archiver();
  41 }
  42
  43 static void format_subst(const struct commit *commit,
  44                          const char *src, size_t len,
  45                          struct strbuf *buf, struct pretty_print_context *ctx)
  46 {
  47         char *to_free = NULL;
  48         struct strbuf fmt = STRBUF_INIT;
  49
  50         if (src == buf->buf)
  51                 to_free = strbuf_detach(buf, NULL);
  52         for (;;) {
  53                 const char *b, *c;
  54
  55                 b = memmem(src, len, "$Format:", 8);
  56                 if (!b)
  57                         break;
  58                 c = memchr(b + 8, '$', (src + len) - b - 8);
  59                 if (!c)
  60                         break;
  61
  62                 strbuf_reset(&fmt);
  63                 strbuf_add(&fmt, b + 8, c - b - 8);
  64
  65                 strbuf_add(buf, src, b - src);
  66                 format_commit_message(commit, fmt.buf, buf, ctx);
  67                 len -= c + 1 - src;
  68                 src  = c + 1;
  69         }
  70         strbuf_add(buf, src, len);
  71         strbuf_release(&fmt);
  72         free(to_free);
  73 }
  74
  75 static void *object_file_to_archive(const struct archiver_args *args,
  76                                     const char *path,
  77                                     const struct object_id *oid,
  78                                     unsigned int mode,
  79                                     enum object_type *type,
  80                                     unsigned long *sizep)
  81 {
  82         void *buffer;
  83         const struct commit *commit = args->convert ? args->commit : NULL;
  84         struct checkout_metadata meta;
  85
  86         init_checkout_metadata(&meta, args->refname,
  87                                args->commit_oid ? args->commit_oid :
  88                                (args->tree ? &args->tree->object.oid : NULL), oid);
  89
  90         path += args->baselen;
  91         buffer = read_object_file(oid, type, sizep);
  92         if (buffer && S_ISREG(mode)) {
  93                 struct strbuf buf = STRBUF_INIT;
  94                 size_t size = 0;
  95
  96                 strbuf_attach(&buf, buffer, *sizep, *sizep + 1);
  97                 convert_to_working_tree(args->repo->index, path, buf.buf, buf.len, &buf, &meta);
  98                 if (commit)
  99                         format_subst(commit, buf.buf, buf.len, &buf, args->pretty_ctx);
 100                 buffer = strbuf_detach(&buf, &size);
 101                 *sizep = size;
 102         }
 103
 104         return buffer;
 105 }
 106
 107 struct directory {
 108         struct directory *up;
 109         struct object_id oid;
 110         int baselen, len;
 111         unsigned mode;
 112         char path[FLEX_ARRAY];
 113 };
 114
 115 struct archiver_context {
 116         struct archiver_args *args;
 117         write_archive_entry_fn_t write_entry;
 118         struct directory *bottom;
 119 };
 120
 121 static const struct attr_check *get_archive_attrs(struct index_state *istate,
 122                                                   const char *path)
 123 {
 124         static struct attr_check *check;
 125         if (!check)
 126                 check = attr_check_initl("export-ignore", "export-subst", NULL);
 127         git_check_attr(istate, NULL, path, check);
 128         return check;
 129 }
 130
 131 static int check_attr_export_ignore(const struct attr_check *check)
 132 {
 133         return check && ATTR_TRUE(check->items[0].value);
 134 }
 135
 136 static int check_attr_export_subst(const struct attr_check *check)
 137 {
 138         return check && ATTR_TRUE(check->items[1].value);
 139 }
 140
 141 static int write_archive_entry(const struct object_id *oid, const char *base,
 142                 int baselen, const char *filename, unsigned mode,
 143                 void *context)
 144 {
 145         static struct strbuf path = STRBUF_INIT;
 146         struct archiver_context *c = context;
 147         struct archiver_args *args = c->args;
 148         write_archive_entry_fn_t write_entry = c->write_entry;
 149         int err;
 150         const char *path_without_prefix;
 151         unsigned long size;
 152         void *buffer;
 153         enum object_type type;
 154
 155         args->convert = 0;
 156         strbuf_reset(&path);
 157         strbuf_grow(&path, PATH_MAX);
 158         strbuf_add(&path, args->base, args->baselen);
 159         strbuf_add(&path, base, baselen);
 160         strbuf_addstr(&path, filename);
 161         if (S_ISDIR(mode) || S_ISGITLINK(mode))
 162                 strbuf_addch(&path, '/');
 163         path_without_prefix = path.buf + args->baselen;
 164
 165         if (!S_ISDIR(mode)) {
 166                 const struct attr_check *check;
 167                 check = get_archive_attrs(args->repo->index, path_without_prefix);
 168                 if (check_attr_export_ignore(check))
 169                         return 0;
 170                 args->convert = check_attr_export_subst(check);
 171         }
 172
 173         if (args->verbose)
 174                 fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
 175
 176         if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
 177                 err = write_entry(args, oid, path.buf, path.len, mode, NULL, 0);
 178                 if (err)
 179                         return err;
 180                 return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0);
 181         }
 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 struct object_id *oid,
 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         oidcpy(&d->oid, oid);
 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, base, filename, mode, c);
 257                 return READ_TREE_RECURSIVE;
 258         }
 259
 260         if (write_directory(c))
 261                 return -1;
 262         return write_archive_entry(oid, base->buf, base->len, filename, mode,
 263                                    context);
 264 }
 265
 266 struct extra_file_info {
 267         char *base;
 268         struct stat stat;
 269         void *content;
 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;
 282         int i;
 283
 284         oidcpy(&fake_oid, null_oid());
 285
 286         if (args->baselen > 0 && args->base[args->baselen - 1] == '/') {
 287                 size_t len = args->baselen;
 288
 289                 while (len > 1 && args->base[len - 2] == '/')
 290                         len--;
 291                 if (args->verbose)
 292                         fprintf(stderr, "%.*s\n", (int)len, args->base);
 293                 err = write_entry(args, &args->tree->object.oid, args->base,
 294                                   len, 040777, NULL, 0);
 295                 if (err)
 296                         return err;
 297         }
 298
 299         memset(&context, 0, sizeof(context));
 300         context.args = args;
 301         context.write_entry = write_entry;
 302
 303         /*
 304          * Setup index and instruct attr to read index only
 305          */
 306         if (!args->worktree_attributes) {
 307                 memset(&opts, 0, sizeof(opts));
 308                 opts.index_only = 1;
 309                 opts.head_idx = -1;
 310                 opts.src_index = args->repo->index;
 311                 opts.dst_index = args->repo->index;
 312                 opts.fn = oneway_merge;
 313                 init_tree_desc(&t, args->tree->buffer, args->tree->size);
 314                 if (unpack_trees(1, &t, &opts))
 315                         return -1;
 316                 git_attr_set_direction(GIT_ATTR_INDEX);
 317         }
 318
 319         err = read_tree(args->repo, args->tree,
 320                         &args->pathspec,
 321                         queue_or_write_archive_entry,
 322                         &context);
 323         if (err == READ_TREE_RECURSIVE)
 324                 err = 0;
 325         while (context.bottom) {
 326                 struct directory *next = context.bottom->up;
 327                 free(context.bottom);
 328                 context.bottom = next;
 329         }
 330
 331         for (i = 0; i < args->extra_files.nr; i++) {
 332                 struct string_list_item *item = args->extra_files.items + i;
 333                 char *path = item->string;
 334                 struct extra_file_info *info = item->util;
 335
 336                 put_be64(fake_oid.hash, i + 1);
 337
 338                 if (!info->content) {
 339                         strbuf_reset(&path_in_archive);
 340                         if (info->base)
 341                                 strbuf_addstr(&path_in_archive, info->base);
 342                         strbuf_addstr(&path_in_archive, basename(path));
 343
 344                         strbuf_reset(&content);
 345                         if (strbuf_read_file(&content, path, info->stat.st_size) < 0)
 346                                 err = error_errno(_("cannot read '%s'"), path);
 347                         else
 348                                 err = write_entry(args, &fake_oid, path_in_archive.buf,
 349                                                   path_in_archive.len,
 350                                                   canon_mode(info->stat.st_mode),
 351                                                   content.buf, content.len);
 352                 } else {
 353                         err = write_entry(args, &fake_oid,
 354                                           path, strlen(path),
 355                                           canon_mode(info->stat.st_mode),
 356                                           info->content, info->stat.st_size);
 357                 }
 358
 359                 if (err)
 360                         break;
 361         }
 362         strbuf_release(&path_in_archive);
 363         strbuf_release(&content);
 364
 365         return err;
 366 }
 367
 368 static const struct archiver *lookup_archiver(const char *name)
 369 {
 370         int i;
 371
 372         if (!name)
 373                 return NULL;
 374
 375         for (i = 0; i < nr_archivers; i++) {
 376                 if (!strcmp(name, archivers[i]->name))
 377                         return archivers[i];
 378         }
 379         return NULL;
 380 }
 381
 382 struct path_exists_context {
 383         struct pathspec pathspec;
 384         struct archiver_args *args;
 385 };
 386
 387 static int reject_entry(const struct object_id *oid UNUSED,
 388                         struct strbuf *base,
 389                         const char *filename, unsigned mode,
 390                         void *context)
 391 {
 392         int ret = -1;
 393         struct path_exists_context *ctx = context;
 394
 395         if (S_ISDIR(mode)) {
 396                 struct strbuf sb = STRBUF_INIT;
 397                 strbuf_addbuf(&sb, base);
 398                 strbuf_addstr(&sb, filename);
 399                 if (!match_pathspec(ctx->args->repo->index,
 400                                     &ctx->pathspec,
 401                                     sb.buf, sb.len, 0, NULL, 1))
 402                         ret = READ_TREE_RECURSIVE;
 403                 strbuf_release(&sb);
 404         }
 405         return ret;
 406 }
 407
 408 static int path_exists(struct archiver_args *args, const char *path)
 409 {
 410         const char *paths[] = { path, NULL };
 411         struct path_exists_context ctx;
 412         int ret;
 413
 414         ctx.args = args;
 415         parse_pathspec(&ctx.pathspec, 0, 0, "", paths);
 416         ctx.pathspec.recursive = 1;
 417         ret = read_tree(args->repo, args->tree,
 418                         &ctx.pathspec,
 419                         reject_entry, &ctx);
 420         clear_pathspec(&ctx.pathspec);
 421         return ret != 0;
 422 }
 423
 424 static void parse_pathspec_arg(const char **pathspec,
 425                 struct archiver_args *ar_args)
 426 {
 427         /*
 428          * must be consistent with parse_pathspec in path_exists()
 429          * Also if pathspec patterns are dependent, we're in big
 430          * trouble as we test each one separately
 431          */
 432         parse_pathspec(&ar_args->pathspec, 0,
 433                        PATHSPEC_PREFER_FULL,
 434                        "", pathspec);
 435         ar_args->pathspec.recursive = 1;
 436         if (pathspec) {
 437                 while (*pathspec) {
 438                         if (**pathspec && !path_exists(ar_args, *pathspec))
 439                                 die(_("pathspec '%s' did not match any files"), *pathspec);
 440                         pathspec++;
 441                 }
 442         }
 443 }
 444
 445 static void parse_treeish_arg(const char **argv,
 446                 struct archiver_args *ar_args, const char *prefix,
 447                 int remote)
 448 {
 449         const char *name = argv[0];
 450         const struct object_id *commit_oid;
 451         time_t archive_time;
 452         struct tree *tree;
 453         const struct commit *commit;
 454         struct object_id oid;
 455         char *ref = NULL;
 456
 457         /* Remotes are only allowed to fetch actual refs */
 458         if (remote && !remote_allow_unreachable) {
 459                 const char *colon = strchrnul(name, ':');
 460                 int refnamelen = colon - name;
 461
 462                 if (!dwim_ref(name, refnamelen, &oid, &ref, 0))
 463                         die(_("no such ref: %.*s"), refnamelen, name);
 464         } else {
 465                 dwim_ref(name, strlen(name), &oid, &ref, 0);
 466         }
 467
 468         if (get_oid(name, &oid))
 469                 die(_("not a valid object name: %s"), name);
 470
 471         commit = lookup_commit_reference_gently(ar_args->repo, &oid, 1);
 472         if (commit) {
 473                 commit_oid = &commit->object.oid;
 474                 archive_time = commit->date;
 475         } else {
 476                 commit_oid = NULL;
 477                 archive_time = time(NULL);
 478         }
 479         if (ar_args->mtime_option)
 480                 archive_time = approxidate(ar_args->mtime_option);
 481
 482         tree = parse_tree_indirect(&oid);
 483         if (!tree)
 484                 die(_("not a tree object: %s"), oid_to_hex(&oid));
 485
 486         if (prefix) {
 487                 struct object_id tree_oid;
 488                 unsigned short mode;
 489                 int err;
 490
 491                 err = get_tree_entry(ar_args->repo,
 492                                      &tree->object.oid,
 493                                      prefix, &tree_oid,
 494                                      &mode);
 495                 if (err || !S_ISDIR(mode))
 496                         die(_("current working directory is untracked"));
 497
 498                 tree = parse_tree_indirect(&tree_oid);
 499         }
 500         ar_args->refname = ref;
 501         ar_args->tree = tree;
 502         ar_args->commit_oid = commit_oid;
 503         ar_args->commit = commit;
 504         ar_args->time = archive_time;
 505 }
 506
 507 static void extra_file_info_clear(void *util, const char *str UNUSED)
 508 {
 509         struct extra_file_info *info = util;
 510         free(info->base);
 511         free(info->content);
 512         free(info);
 513 }
 514
 515 static int add_file_cb(const struct option *opt, const char *arg, int unset)
 516 {
 517         struct archiver_args *args = opt->value;
 518         const char **basep = (const char **)opt->defval;
 519         const char *base = *basep;
 520         char *path;
 521         struct string_list_item *item;
 522         struct extra_file_info *info;
 523
 524         if (unset) {
 525                 string_list_clear_func(&args->extra_files,
 526                                        extra_file_info_clear);
 527                 return 0;
 528         }
 529
 530         if (!arg)
 531                 return -1;
 532
 533         info = xmalloc(sizeof(*info));
 534         info->base = xstrdup_or_null(base);
 535
 536         if (!strcmp(opt->long_name, "add-file")) {
 537                 path = prefix_filename(args->prefix, arg);
 538                 if (stat(path, &info->stat))
 539                         die(_("File not found: %s"), path);
 540                 if (!S_ISREG(info->stat.st_mode))
 541                         die(_("Not a regular file: %s"), path);
 542                 info->content = NULL; /* read the file later */
 543         } else if (!strcmp(opt->long_name, "add-virtual-file")) {
 544                 struct strbuf buf = STRBUF_INIT;
 545                 const char *p = arg;
 546
 547                 if (*p != '"')
 548                         p = strchr(p, ':');
 549                 else if (unquote_c_style(&buf, p, &p) < 0)
 550                         die(_("unclosed quote: '%s'"), arg);
 551
 552                 if (!p || *p != ':')
 553                         die(_("missing colon: '%s'"), arg);
 554
 555                 if (p == arg)
 556                         die(_("empty file name: '%s'"), arg);
 557
 558                 path = buf.len ?
 559                         strbuf_detach(&buf, NULL) : xstrndup(arg, p - arg);
 560
 561                 if (args->prefix) {
 562                         char *save = path;
 563                         path = prefix_filename(args->prefix, path);
 564                         free(save);
 565                 }
 566                 memset(&info->stat, 0, sizeof(info->stat));
 567                 info->stat.st_mode = S_IFREG | 0644;
 568                 info->content = xstrdup(p + 1);
 569                 info->stat.st_size = strlen(info->content);
 570         } else {
 571                 BUG("add_file_cb() called for %s", opt->long_name);
 572         }
 573         item = string_list_append_nodup(&args->extra_files, path);
 574         item->util = info;
 575
 576         return 0;
 577 }
 578
 579 static int number_callback(const struct option *opt, const char *arg, int unset)
 580 {
 581         BUG_ON_OPT_NEG(unset);
 582         *(int *)opt->value = strtol(arg, NULL, 10);
 583         return 0;
 584 }
 585
 586 static int parse_archive_args(int argc, const char **argv,
 587                 const struct archiver **ar, struct archiver_args *args,
 588                 const char *name_hint, int is_remote)
 589 {
 590         const char *format = NULL;
 591         const char *base = NULL;
 592         const char *remote = NULL;
 593         const char *exec = NULL;
 594         const char *output = NULL;
 595         const char *mtime_option = NULL;
 596         int compression_level = -1;
 597         int verbose = 0;
 598         int i;
 599         int list = 0;
 600         int worktree_attributes = 0;
 601         struct option opts[] = {
 602                 OPT_GROUP(""),
 603                 OPT_STRING(0, "format", &format, N_("fmt"), N_("archive format")),
 604                 OPT_STRING(0, "prefix", &base, N_("prefix"),
 605                         N_("prepend prefix to each pathname in the archive")),
 606                 { OPTION_CALLBACK, 0, "add-file", args, N_("file"),
 607                   N_("add untracked file to archive"), 0, add_file_cb,
 608                   (intptr_t)&base },
 609                 { OPTION_CALLBACK, 0, "add-virtual-file", args,
 610                   N_("path:content"), N_("add untracked file to archive"), 0,
 611                   add_file_cb, (intptr_t)&base },
 612                 OPT_STRING('o', "output", &output, N_("file"),
 613                         N_("write the archive to this file")),
 614                 OPT_BOOL(0, "worktree-attributes", &worktree_attributes,
 615                         N_("read .gitattributes in working directory")),
 616                 OPT__VERBOSE(&verbose, N_("report archived files on stderr")),
 617                 { OPTION_STRING, 0, "mtime", &mtime_option, N_("time"),
 618                   N_("set modification time of archive entries"),
 619                   PARSE_OPT_NONEG },
 620                 OPT_NUMBER_CALLBACK(&compression_level,
 621                         N_("set compression level"), number_callback),
 622                 OPT_GROUP(""),
 623                 OPT_BOOL('l', "list", &list,
 624                         N_("list supported archive formats")),
 625                 OPT_GROUP(""),
 626                 OPT_STRING(0, "remote", &remote, N_("repo"),
 627                         N_("retrieve the archive from remote repository <repo>")),
 628                 OPT_STRING(0, "exec", &exec, N_("command"),
 629                         N_("path to the remote git-upload-archive command")),
 630                 OPT_END()
 631         };
 632
 633         argc = parse_options(argc, argv, NULL, opts, archive_usage, 0);
 634
 635         if (remote)
 636                 die(_("Unexpected option --remote"));
 637         if (exec)
 638                 die(_("the option '%s' requires '%s'"), "--exec", "--remote");
 639         if (output)
 640                 die(_("Unexpected option --output"));
 641         if (is_remote && args->extra_files.nr)
 642                 die(_("options '%s' and '%s' cannot be used together"), "--add-file", "--remote");
 643
 644         if (!base)
 645                 base = "";
 646
 647         if (list) {
 648                 for (i = 0; i < nr_archivers; i++)
 649                         if (!is_remote || archivers[i]->flags & ARCHIVER_REMOTE)
 650                                 printf("%s\n", archivers[i]->name);
 651                 exit(0);
 652         }
 653
 654         if (!format && name_hint)
 655                 format = archive_format_from_filename(name_hint);
 656         if (!format)
 657                 format = "tar";
 658
 659         /* We need at least one parameter -- tree-ish */
 660         if (argc < 1)
 661                 usage_with_options(archive_usage, opts);
 662         *ar = lookup_archiver(format);
 663         if (!*ar || (is_remote && !((*ar)->flags & ARCHIVER_REMOTE)))
 664                 die(_("Unknown archive format '%s'"), format);
 665
 666         args->compression_level = Z_DEFAULT_COMPRESSION;
 667         if (compression_level != -1) {
 668                 int levels_ok = (*ar)->flags & ARCHIVER_WANT_COMPRESSION_LEVELS;
 669                 int high_ok = (*ar)->flags & ARCHIVER_HIGH_COMPRESSION_LEVELS;
 670                 if (levels_ok && (compression_level <= 9 || high_ok))
 671                         args->compression_level = compression_level;
 672                 else {
 673                         die(_("Argument not supported for format '%s': -%d"),
 674                                         format, compression_level);
 675                 }
 676         }
 677         args->verbose = verbose;
 678         args->base = base;
 679         args->baselen = strlen(base);
 680         args->worktree_attributes = worktree_attributes;
 681         args->mtime_option = mtime_option;
 682
 683         return argc;
 684 }
 685
 686 int write_archive(int argc, const char **argv, const char *prefix,
 687                   struct repository *repo,
 688                   const char *name_hint, int remote)
 689 {
 690         const struct archiver *ar = NULL;
 691         struct pretty_print_describe_status describe_status = {0};
 692         struct pretty_print_context ctx = {0};
 693         struct archiver_args args;
 694         int rc;
 695
 696         git_config_get_bool("uploadarchive.allowunreachable", &remote_allow_unreachable);
 697         git_config(git_default_config, NULL);
 698
 699         describe_status.max_invocations = 1;
 700         ctx.date_mode.type = DATE_NORMAL;
 701         ctx.abbrev = DEFAULT_ABBREV;
 702         ctx.describe_status = &describe_status;
 703         args.pretty_ctx = &ctx;
 704         args.repo = repo;
 705         args.prefix = prefix;
 706         string_list_init_dup(&args.extra_files);
 707         argc = parse_archive_args(argc, argv, &ar, &args, name_hint, remote);
 708         if (!startup_info->have_repository) {
 709                 /*
 710                  * We know this will die() with an error, so we could just
 711                  * die ourselves; but its error message will be more specific
 712                  * than what we could write here.
 713                  */
 714                 setup_git_directory();
 715         }
 716
 717         parse_treeish_arg(argv, &args, prefix, remote);
 718         parse_pathspec_arg(argv + 1, &args);
 719
 720         rc = ar->write_archive(ar, &args);
 721
 722         string_list_clear_func(&args.extra_files, extra_file_info_clear);
 723         free(args.refname);
 724         clear_pathspec(&args.pathspec);
 725
 726         return rc;
 727 }
 728
 729 static int match_extension(const char *filename, const char *ext)
 730 {
 731         int prefixlen = strlen(filename) - strlen(ext);
 732
 733         /*
 734          * We need 1 character for the '.', and 1 character to ensure that the
 735          * prefix is non-empty (k.e., we don't match .tar.gz with no actual
 736          * filename).
 737          */
 738         if (prefixlen < 2 || filename[prefixlen - 1] != '.')
 739                 return 0;
 740         return !strcmp(filename + prefixlen, ext);
 741 }
 742
 743 const char *archive_format_from_filename(const char *filename)
 744 {
 745         int i;
 746
 747         for (i = 0; i < nr_archivers; i++)
 748                 if (match_extension(filename, archivers[i]->name))
 749                         return archivers[i]->name;
 750         return NULL;
 751 }