archive.c

   1 #include "git-compat-util.h"
   2 #include "alloc.h"
   3 #include "config.h"
   4 #include "gettext.h"
   5 #include "hex.h"
   6 #include "refs.h"
   7 #include "object-store.h"
   8 #include "commit.h"
   9 #include "tree-walk.h"
  10 #include "attr.h"
  11 #include "archive.h"
  12 #include "parse-options.h"
  13 #include "unpack-trees.h"
  14 #include "dir.h"
  15 #include "quote.h"
  16
  17 static char const * const archive_usage[] = {
  18         N_("git archive [<options>] <tree-ish> [<path>...]"),
  19         "git archive --list",
  20         N_("git archive --remote <repo> [--exec <cmd>] [<options>] <tree-ish> [<path>...]"),
  21         N_("git archive --remote <repo> [--exec <cmd>] --list"),
  22         NULL
  23 };
  24
  25 static const struct archiver **archivers;
  26 static int nr_archivers;
  27 static int alloc_archivers;
  28 static int remote_allow_unreachable;
  29
  30 void register_archiver(struct archiver *ar)
  31 {
  32         ALLOC_GROW(archivers, nr_archivers + 1, alloc_archivers);
  33         archivers[nr_archivers++] = ar;
  34 }
  35
  36 void init_archivers(void)
  37 {
  38         init_tar_archiver();
  39         init_zip_archiver();
  40 }
  41
  42 static void format_subst(const struct commit *commit,
  43                          const char *src, size_t len,
  44                          struct strbuf *buf, struct pretty_print_context *ctx)
  45 {
  46         char *to_free = NULL;
  47         struct strbuf fmt = STRBUF_INIT;
  48
  49         if (src == buf->buf)
  50                 to_free = strbuf_detach(buf, NULL);
  51         for (;;) {
  52                 const char *b, *c;
  53
  54                 b = memmem(src, len, "$Format:", 8);
  55                 if (!b)
  56                         break;
  57                 c = memchr(b + 8, '$', (src + len) - b - 8);
  58                 if (!c)
  59                         break;
  60
  61                 strbuf_reset(&fmt);
  62                 strbuf_add(&fmt, b + 8, c - b - 8);
  63
  64                 strbuf_add(buf, src, b - src);
  65                 format_commit_message(commit, fmt.buf, buf, ctx);
  66                 len -= c + 1 - src;
  67                 src  = c + 1;
  68         }
  69         strbuf_add(buf, src, len);
  70         strbuf_release(&fmt);
  71         free(to_free);
  72 }
  73
  74 static void *object_file_to_archive(const struct archiver_args *args,
  75                                     const char *path,
  76                                     const struct object_id *oid,
  77                                     unsigned int mode,
  78                                     enum object_type *type,
  79                                     unsigned long *sizep)
  80 {
  81         void *buffer;
  82         const struct commit *commit = args->convert ? args->commit : NULL;
  83         struct checkout_metadata meta;
  84
  85         init_checkout_metadata(&meta, args->refname,
  86                                args->commit_oid ? args->commit_oid :
  87                                (args->tree ? &args->tree->object.oid : NULL), oid);
  88
  89         path += args->baselen;
  90         buffer = read_object_file(oid, type, sizep);
  91         if (buffer && S_ISREG(mode)) {
  92                 struct strbuf buf = STRBUF_INIT;
  93                 size_t size = 0;
  94
  95                 strbuf_attach(&buf, buffer, *sizep, *sizep + 1);
  96                 convert_to_working_tree(args->repo->index, path, buf.buf, buf.len, &buf, &meta);
  97                 if (commit)
  98                         format_subst(commit, buf.buf, buf.len, &buf, args->pretty_ctx);
  99                 buffer = strbuf_detach(&buf, &size);
 100                 *sizep = size;
 101         }
 102
 103         return buffer;
 104 }
 105
 106 struct directory {
 107         struct directory *up;
 108         struct object_id oid;
 109         int baselen, len;
 110         unsigned mode;
 111         char path[FLEX_ARRAY];
 112 };
 113
 114 struct archiver_context {
 115         struct archiver_args *args;
 116         write_archive_entry_fn_t write_entry;
 117         struct directory *bottom;
 118 };
 119
 120 static const struct attr_check *get_archive_attrs(struct index_state *istate,
 121                                                   const char *path)
 122 {
 123         static struct attr_check *check;
 124         if (!check)
 125                 check = attr_check_initl("export-ignore", "export-subst", NULL);
 126         git_check_attr(istate, NULL, path, check);
 127         return check;
 128 }
 129
 130 static int check_attr_export_ignore(const struct attr_check *check)
 131 {
 132         return check && ATTR_TRUE(check->items[0].value);
 133 }
 134
 135 static int check_attr_export_subst(const struct attr_check *check)
 136 {
 137         return check && ATTR_TRUE(check->items[1].value);
 138 }
 139
 140 static int write_archive_entry(const struct object_id *oid, const char *base,
 141                 int baselen, const char *filename, unsigned mode,
 142                 void *context)
 143 {
 144         static struct strbuf path = STRBUF_INIT;
 145         struct archiver_context *c = context;
 146         struct archiver_args *args = c->args;
 147         write_archive_entry_fn_t write_entry = c->write_entry;
 148         int err;
 149         const char *path_without_prefix;
 150         unsigned long size;
 151         void *buffer;
 152         enum object_type type;
 153
 154         args->convert = 0;
 155         strbuf_reset(&path);
 156         strbuf_grow(&path, PATH_MAX);
 157         strbuf_add(&path, args->base, args->baselen);
 158         strbuf_add(&path, base, baselen);
 159         strbuf_addstr(&path, filename);
 160         if (S_ISDIR(mode) || S_ISGITLINK(mode))
 161                 strbuf_addch(&path, '/');
 162         path_without_prefix = path.buf + args->baselen;
 163
 164         if (!S_ISDIR(mode)) {
 165                 const struct attr_check *check;
 166                 check = get_archive_attrs(args->repo->index, path_without_prefix);
 167                 if (check_attr_export_ignore(check))
 168                         return 0;
 169                 args->convert = check_attr_export_subst(check);
 170         }
 171
 172         if (args->verbose)
 173                 fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
 174
 175         if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
 176                 err = write_entry(args, oid, path.buf, path.len, mode, NULL, 0);
 177                 if (err)
 178                         return err;
 179                 return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0);
 180         }
 181
 182         /* Stream it? */
 183         if (S_ISREG(mode) && !args->convert &&
 184             oid_object_info(args->repo, oid, &size) == OBJ_BLOB &&
 185             size > big_file_threshold)
 186                 return write_entry(args, oid, path.buf, path.len, mode, NULL, size);
 187
 188         buffer = object_file_to_archive(args, path.buf, oid, mode, &type, &size);
 189         if (!buffer)
 190                 return error(_("cannot read '%s'"), oid_to_hex(oid));
 191         err = write_entry(args, oid, path.buf, path.len, mode, buffer, size);
 192         free(buffer);
 193         return err;
 194 }
 195
 196 static void queue_directory(const struct object_id *oid,
 197                 struct strbuf *base, const char *filename,
 198                 unsigned mode, struct archiver_context *c)
 199 {
 200         struct directory *d;
 201         size_t len = st_add4(base->len, 1, strlen(filename), 1);
 202         d = xmalloc(st_add(sizeof(*d), len));
 203         d->up      = c->bottom;
 204         d->baselen = base->len;
 205         d->mode    = mode;
 206         c->bottom  = d;
 207         d->len = xsnprintf(d->path, len, "%.*s%s/", (int)base->len, base->buf, filename);
 208         oidcpy(&d->oid, oid);
 209 }
 210
 211 static int write_directory(struct archiver_context *c)
 212 {
 213         struct directory *d = c->bottom;
 214         int ret;
 215
 216         if (!d)
 217                 return 0;
 218         c->bottom = d->up;
 219         d->path[d->len - 1] = '\0'; /* no trailing slash */
 220         ret =
 221                 write_directory(c) ||
 222                 write_archive_entry(&d->oid, d->path, d->baselen,
 223                                     d->path + d->baselen, d->mode,
 224                                     c) != READ_TREE_RECURSIVE;
 225         free(d);
 226         return ret ? -1 : 0;
 227 }
 228
 229 static int queue_or_write_archive_entry(const struct object_id *oid,
 230                 struct strbuf *base, const char *filename,
 231                 unsigned mode, void *context)
 232 {
 233         struct archiver_context *c = context;
 234
 235         while (c->bottom &&
 236                !(base->len >= c->bottom->len &&
 237                  !strncmp(base->buf, c->bottom->path, c->bottom->len))) {
 238                 struct directory *next = c->bottom->up;
 239                 free(c->bottom);
 240                 c->bottom = next;
 241         }
 242
 243         if (S_ISDIR(mode)) {
 244                 size_t baselen = base->len;
 245                 const struct attr_check *check;
 246
 247                 /* Borrow base, but restore its original value when done. */
 248                 strbuf_addstr(base, filename);
 249                 strbuf_addch(base, '/');
 250                 check = get_archive_attrs(c->args->repo->index, base->buf);
 251                 strbuf_setlen(base, baselen);
 252
 253                 if (check_attr_export_ignore(check))
 254                         return 0;
 255                 queue_directory(oid, base, filename, mode, c);
 256                 return READ_TREE_RECURSIVE;
 257         }
 258
 259         if (write_directory(c))
 260                 return -1;
 261         return write_archive_entry(oid, base->buf, base->len, filename, mode,
 262                                    context);
 263 }
 264
 265 struct extra_file_info {
 266         char *base;
 267         struct stat stat;
 268         void *content;
 269 };
 270
 271 int write_archive_entries(struct archiver_args *args,
 272                 write_archive_entry_fn_t write_entry)
 273 {
 274         struct archiver_context context;
 275         struct unpack_trees_options opts;
 276         struct tree_desc t;
 277         int err;
 278         struct strbuf path_in_archive = STRBUF_INIT;
 279         struct strbuf content = STRBUF_INIT;
 280         struct object_id fake_oid;
 281         int i;
 282
 283         oidcpy(&fake_oid, null_oid());
 284
 285         if (args->baselen > 0 && args->base[args->baselen - 1] == '/') {
 286                 size_t len = args->baselen;
 287
 288                 while (len > 1 && args->base[len - 2] == '/')
 289                         len--;
 290                 if (args->verbose)
 291                         fprintf(stderr, "%.*s\n", (int)len, args->base);
 292                 err = write_entry(args, &args->tree->object.oid, args->base,
 293                                   len, 040777, NULL, 0);
 294                 if (err)
 295                         return err;
 296         }
 297
 298         memset(&context, 0, sizeof(context));
 299         context.args = args;
 300         context.write_entry = write_entry;
 301
 302         /*
 303          * Setup index and instruct attr to read index only
 304          */
 305         if (!args->worktree_attributes) {
 306                 memset(&opts, 0, sizeof(opts));
 307                 opts.index_only = 1;
 308                 opts.head_idx = -1;
 309                 opts.src_index = args->repo->index;
 310                 opts.dst_index = args->repo->index;
 311                 opts.fn = oneway_merge;
 312                 init_tree_desc(&t, args->tree->buffer, args->tree->size);
 313                 if (unpack_trees(1, &t, &opts))
 314                         return -1;
 315                 git_attr_set_direction(GIT_ATTR_INDEX);
 316         }
 317
 318         err = read_tree(args->repo, args->tree,
 319                         &args->pathspec,
 320                         queue_or_write_archive_entry,
 321                         &context);
 322         if (err == READ_TREE_RECURSIVE)
 323                 err = 0;
 324         while (context.bottom) {
 325                 struct directory *next = context.bottom->up;
 326                 free(context.bottom);
 327                 context.bottom = next;
 328         }
 329
 330         for (i = 0; i < args->extra_files.nr; i++) {
 331                 struct string_list_item *item = args->extra_files.items + i;
 332                 char *path = item->string;
 333                 struct extra_file_info *info = item->util;
 334
 335                 put_be64(fake_oid.hash, i + 1);
 336
 337                 if (!info->content) {
 338                         strbuf_reset(&path_in_archive);
 339                         if (info->base)
 340                                 strbuf_addstr(&path_in_archive, info->base);
 341                         strbuf_addstr(&path_in_archive, basename(path));
 342
 343                         strbuf_reset(&content);
 344                         if (strbuf_read_file(&content, path, info->stat.st_size) < 0)
 345                                 err = error_errno(_("cannot read '%s'"), path);
 346                         else
 347                                 err = write_entry(args, &fake_oid, path_in_archive.buf,
 348                                                   path_in_archive.len,
 349                                                   canon_mode(info->stat.st_mode),
 350                                                   content.buf, content.len);
 351                 } else {
 352                         err = write_entry(args, &fake_oid,
 353                                           path, strlen(path),
 354                                           canon_mode(info->stat.st_mode),
 355                                           info->content, info->stat.st_size);
 356                 }
 357
 358                 if (err)
 359                         break;
 360         }
 361         strbuf_release(&path_in_archive);
 362         strbuf_release(&content);
 363
 364         return err;
 365 }
 366
 367 static const struct archiver *lookup_archiver(const char *name)
 368 {
 369         int i;
 370
 371         if (!name)
 372                 return NULL;
 373
 374         for (i = 0; i < nr_archivers; i++) {
 375                 if (!strcmp(name, archivers[i]->name))
 376                         return archivers[i];
 377         }
 378         return NULL;
 379 }
 380
 381 struct path_exists_context {
 382         struct pathspec pathspec;
 383         struct archiver_args *args;
 384 };
 385
 386 static int reject_entry(const struct object_id *oid UNUSED,
 387                         struct strbuf *base,
 388                         const char *filename, unsigned mode,
 389                         void *context)
 390 {
 391         int ret = -1;
 392         struct path_exists_context *ctx = context;
 393
 394         if (S_ISDIR(mode)) {
 395                 struct strbuf sb = STRBUF_INIT;
 396                 strbuf_addbuf(&sb, base);
 397                 strbuf_addstr(&sb, filename);
 398                 if (!match_pathspec(ctx->args->repo->index,
 399                                     &ctx->pathspec,
 400                                     sb.buf, sb.len, 0, NULL, 1))
 401                         ret = READ_TREE_RECURSIVE;
 402                 strbuf_release(&sb);
 403         }
 404         return ret;
 405 }
 406
 407 static int path_exists(struct archiver_args *args, const char *path)
 408 {
 409         const char *paths[] = { path, NULL };
 410         struct path_exists_context ctx;
 411         int ret;
 412
 413         ctx.args = args;
 414         parse_pathspec(&ctx.pathspec, 0, 0, "", paths);
 415         ctx.pathspec.recursive = 1;
 416         ret = read_tree(args->repo, args->tree,
 417                         &ctx.pathspec,
 418                         reject_entry, &ctx);
 419         clear_pathspec(&ctx.pathspec);
 420         return ret != 0;
 421 }
 422
 423 static void parse_pathspec_arg(const char **pathspec,
 424                 struct archiver_args *ar_args)
 425 {
 426         /*
 427          * must be consistent with parse_pathspec in path_exists()
 428          * Also if pathspec patterns are dependent, we're in big
 429          * trouble as we test each one separately
 430          */
 431         parse_pathspec(&ar_args->pathspec, 0,
 432                        PATHSPEC_PREFER_FULL,
 433                        "", pathspec);
 434         ar_args->pathspec.recursive = 1;
 435         if (pathspec) {
 436                 while (*pathspec) {
 437                         if (**pathspec && !path_exists(ar_args, *pathspec))
 438                                 die(_("pathspec '%s' did not match any files"), *pathspec);
 439                         pathspec++;
 440                 }
 441         }
 442 }
 443
 444 static void parse_treeish_arg(const char **argv,
 445                 struct archiver_args *ar_args, const char *prefix,
 446                 int remote)
 447 {
 448         const char *name = argv[0];
 449         const struct object_id *commit_oid;
 450         time_t archive_time;
 451         struct tree *tree;
 452         const struct commit *commit;
 453         struct object_id oid;
 454         char *ref = NULL;
 455
 456         /* Remotes are only allowed to fetch actual refs */
 457         if (remote && !remote_allow_unreachable) {
 458                 const char *colon = strchrnul(name, ':');
 459                 int refnamelen = colon - name;
 460
 461                 if (!dwim_ref(name, refnamelen, &oid, &ref, 0))
 462                         die(_("no such ref: %.*s"), refnamelen, name);
 463         } else {
 464                 dwim_ref(name, strlen(name), &oid, &ref, 0);
 465         }
 466
 467         if (get_oid(name, &oid))
 468                 die(_("not a valid object name: %s"), name);
 469
 470         commit = lookup_commit_reference_gently(ar_args->repo, &oid, 1);
 471         if (commit) {
 472                 commit_oid = &commit->object.oid;
 473                 archive_time = commit->date;
 474         } else {
 475                 commit_oid = NULL;
 476                 archive_time = time(NULL);
 477         }
 478         if (ar_args->mtime_option)
 479                 archive_time = approxidate(ar_args->mtime_option);
 480
 481         tree = parse_tree_indirect(&oid);
 482         if (!tree)
 483                 die(_("not a tree object: %s"), oid_to_hex(&oid));
 484
 485         if (prefix) {
 486                 struct object_id tree_oid;
 487                 unsigned short mode;
 488                 int err;
 489
 490                 err = get_tree_entry(ar_args->repo,
 491                                      &tree->object.oid,
 492                                      prefix, &tree_oid,
 493                                      &mode);
 494                 if (err || !S_ISDIR(mode))
 495                         die(_("current working directory is untracked"));
 496
 497                 tree = parse_tree_indirect(&tree_oid);
 498         }
 499         ar_args->refname = ref;
 500         ar_args->tree = tree;
 501         ar_args->commit_oid = commit_oid;
 502         ar_args->commit = commit;
 503         ar_args->time = archive_time;
 504 }
 505
 506 static void extra_file_info_clear(void *util, const char *str UNUSED)
 507 {
 508         struct extra_file_info *info = util;
 509         free(info->base);
 510         free(info->content);
 511         free(info);
 512 }
 513
 514 static int add_file_cb(const struct option *opt, const char *arg, int unset)
 515 {
 516         struct archiver_args *args = opt->value;
 517         const char **basep = (const char **)opt->defval;
 518         const char *base = *basep;
 519         char *path;
 520         struct string_list_item *item;
 521         struct extra_file_info *info;
 522
 523         if (unset) {
 524                 string_list_clear_func(&args->extra_files,
 525                                        extra_file_info_clear);
 526                 return 0;
 527         }
 528
 529         if (!arg)
 530                 return -1;
 531
 532         info = xmalloc(sizeof(*info));
 533         info->base = xstrdup_or_null(base);
 534
 535         if (!strcmp(opt->long_name, "add-file")) {
 536                 path = prefix_filename(args->prefix, arg);
 537                 if (stat(path, &info->stat))
 538                         die(_("File not found: %s"), path);
 539                 if (!S_ISREG(info->stat.st_mode))
 540                         die(_("Not a regular file: %s"), path);
 541                 info->content = NULL; /* read the file later */
 542         } else if (!strcmp(opt->long_name, "add-virtual-file")) {
 543                 struct strbuf buf = STRBUF_INIT;
 544                 const char *p = arg;
 545
 546                 if (*p != '"')
 547                         p = strchr(p, ':');
 548                 else if (unquote_c_style(&buf, p, &p) < 0)
 549                         die(_("unclosed quote: '%s'"), arg);
 550
 551                 if (!p || *p != ':')
 552                         die(_("missing colon: '%s'"), arg);
 553
 554                 if (p == arg)
 555                         die(_("empty file name: '%s'"), arg);
 556
 557                 path = buf.len ?
 558                         strbuf_detach(&buf, NULL) : xstrndup(arg, p - arg);
 559
 560                 if (args->prefix) {
 561                         char *save = path;
 562                         path = prefix_filename(args->prefix, path);
 563                         free(save);
 564                 }
 565                 memset(&info->stat, 0, sizeof(info->stat));
 566                 info->stat.st_mode = S_IFREG | 0644;
 567                 info->content = xstrdup(p + 1);
 568                 info->stat.st_size = strlen(info->content);
 569         } else {
 570                 BUG("add_file_cb() called for %s", opt->long_name);
 571         }
 572         item = string_list_append_nodup(&args->extra_files, path);
 573         item->util = info;
 574
 575         return 0;
 576 }
 577
 578 static int number_callback(const struct option *opt, const char *arg, int unset)
 579 {
 580         BUG_ON_OPT_NEG(unset);
 581         *(int *)opt->value = strtol(arg, NULL, 10);
 582         return 0;
 583 }
 584
 585 static int parse_archive_args(int argc, const char **argv,
 586                 const struct archiver **ar, struct archiver_args *args,
 587                 const char *name_hint, int is_remote)
 588 {
 589         const char *format = NULL;
 590         const char *base = NULL;
 591         const char *remote = NULL;
 592         const char *exec = NULL;
 593         const char *output = NULL;
 594         const char *mtime_option = NULL;
 595         int compression_level = -1;
 596         int verbose = 0;
 597         int i;
 598         int list = 0;
 599         int worktree_attributes = 0;
 600         struct option opts[] = {
 601                 OPT_GROUP(""),
 602                 OPT_STRING(0, "format", &format, N_("fmt"), N_("archive format")),
 603                 OPT_STRING(0, "prefix", &base, N_("prefix"),
 604                         N_("prepend prefix to each pathname in the archive")),
 605                 { OPTION_CALLBACK, 0, "add-file", args, N_("file"),
 606                   N_("add untracked file to archive"), 0, add_file_cb,
 607                   (intptr_t)&base },
 608                 { OPTION_CALLBACK, 0, "add-virtual-file", args,
 609                   N_("path:content"), N_("add untracked file to archive"), 0,
 610                   add_file_cb, (intptr_t)&base },
 611                 OPT_STRING('o', "output", &output, N_("file"),
 612                         N_("write the archive to this file")),
 613                 OPT_BOOL(0, "worktree-attributes", &worktree_attributes,
 614                         N_("read .gitattributes in working directory")),
 615                 OPT__VERBOSE(&verbose, N_("report archived files on stderr")),
 616                 { OPTION_STRING, 0, "mtime", &mtime_option, N_("time"),
 617                   N_("set modification time of archive entries"),
 618                   PARSE_OPT_NONEG },
 619                 OPT_NUMBER_CALLBACK(&compression_level,
 620                         N_("set compression level"), number_callback),
 621                 OPT_GROUP(""),
 622                 OPT_BOOL('l', "list", &list,
 623                         N_("list supported archive formats")),
 624                 OPT_GROUP(""),
 625                 OPT_STRING(0, "remote", &remote, N_("repo"),
 626                         N_("retrieve the archive from remote repository <repo>")),
 627                 OPT_STRING(0, "exec", &exec, N_("command"),
 628                         N_("path to the remote git-upload-archive command")),
 629                 OPT_END()
 630         };
 631
 632         argc = parse_options(argc, argv, NULL, opts, archive_usage, 0);
 633
 634         if (remote)
 635                 die(_("Unexpected option --remote"));
 636         if (exec)
 637                 die(_("the option '%s' requires '%s'"), "--exec", "--remote");
 638         if (output)
 639                 die(_("Unexpected option --output"));
 640         if (is_remote && args->extra_files.nr)
 641                 die(_("options '%s' and '%s' cannot be used together"), "--add-file", "--remote");
 642
 643         if (!base)
 644                 base = "";
 645
 646         if (list) {
 647                 for (i = 0; i < nr_archivers; i++)
 648                         if (!is_remote || archivers[i]->flags & ARCHIVER_REMOTE)
 649                                 printf("%s\n", archivers[i]->name);
 650                 exit(0);
 651         }
 652
 653         if (!format && name_hint)
 654                 format = archive_format_from_filename(name_hint);
 655         if (!format)
 656                 format = "tar";
 657
 658         /* We need at least one parameter -- tree-ish */
 659         if (argc < 1)
 660                 usage_with_options(archive_usage, opts);
 661         *ar = lookup_archiver(format);
 662         if (!*ar || (is_remote && !((*ar)->flags & ARCHIVER_REMOTE)))
 663                 die(_("Unknown archive format '%s'"), format);
 664
 665         args->compression_level = Z_DEFAULT_COMPRESSION;
 666         if (compression_level != -1) {
 667                 int levels_ok = (*ar)->flags & ARCHIVER_WANT_COMPRESSION_LEVELS;
 668                 int high_ok = (*ar)->flags & ARCHIVER_HIGH_COMPRESSION_LEVELS;
 669                 if (levels_ok && (compression_level <= 9 || high_ok))
 670                         args->compression_level = compression_level;
 671                 else {
 672                         die(_("Argument not supported for format '%s': -%d"),
 673                                         format, compression_level);
 674                 }
 675         }
 676         args->verbose = verbose;
 677         args->base = base;
 678         args->baselen = strlen(base);
 679         args->worktree_attributes = worktree_attributes;
 680         args->mtime_option = mtime_option;
 681
 682         return argc;
 683 }
 684
 685 int write_archive(int argc, const char **argv, const char *prefix,
 686                   struct repository *repo,
 687                   const char *name_hint, int remote)
 688 {
 689         const struct archiver *ar = NULL;
 690         struct pretty_print_describe_status describe_status = {0};
 691         struct pretty_print_context ctx = {0};
 692         struct archiver_args args;
 693         int rc;
 694
 695         git_config_get_bool("uploadarchive.allowunreachable", &remote_allow_unreachable);
 696         git_config(git_default_config, NULL);
 697
 698         describe_status.max_invocations = 1;
 699         ctx.date_mode.type = DATE_NORMAL;
 700         ctx.abbrev = DEFAULT_ABBREV;
 701         ctx.describe_status = &describe_status;
 702         args.pretty_ctx = &ctx;
 703         args.repo = repo;
 704         args.prefix = prefix;
 705         string_list_init_dup(&args.extra_files);
 706         argc = parse_archive_args(argc, argv, &ar, &args, name_hint, remote);
 707         if (!startup_info->have_repository) {
 708                 /*
 709                  * We know this will die() with an error, so we could just
 710                  * die ourselves; but its error message will be more specific
 711                  * than what we could write here.
 712                  */
 713                 setup_git_directory();
 714         }
 715
 716         parse_treeish_arg(argv, &args, prefix, remote);
 717         parse_pathspec_arg(argv + 1, &args);
 718
 719         rc = ar->write_archive(ar, &args);
 720
 721         string_list_clear_func(&args.extra_files, extra_file_info_clear);
 722         free(args.refname);
 723         clear_pathspec(&args.pathspec);
 724
 725         return rc;
 726 }
 727
 728 static int match_extension(const char *filename, const char *ext)
 729 {
 730         int prefixlen = strlen(filename) - strlen(ext);
 731
 732         /*
 733          * We need 1 character for the '.', and 1 character to ensure that the
 734          * prefix is non-empty (k.e., we don't match .tar.gz with no actual
 735          * filename).
 736          */
 737         if (prefixlen < 2 || filename[prefixlen - 1] != '.')
 738                 return 0;
 739         return !strcmp(filename + prefixlen, ext);
 740 }
 741
 742 const char *archive_format_from_filename(const char *filename)
 743 {
 744         int i;
 745
 746         for (i = 0; i < nr_archivers; i++)
 747                 if (match_extension(filename, archivers[i]->name))
 748                         return archivers[i]->name;
 749         return NULL;
 750 }