archive.c

   1 #include "git-compat-util.h"
   2 #include "abspath.h"
   3 #include "alloc.h"
   4 #include "config.h"
   5 #include "environment.h"
   6 #include "gettext.h"
   7 #include "hex.h"
   8 #include "setup.h"
   9 #include "refs.h"
  10 #include "object-store.h"
  11 #include "commit.h"
  12 #include "tree-walk.h"
  13 #include "attr.h"
  14 #include "archive.h"
  15 #include "parse-options.h"
  16 #include "unpack-trees.h"
  17 #include "dir.h"
  18 #include "quote.h"
  19
  20 static char const * const archive_usage[] = {
  21         N_("git archive [<options>] <tree-ish> [<path>...]"),
  22         "git archive --list",
  23         N_("git archive --remote <repo> [--exec <cmd>] [<options>] <tree-ish> [<path>...]"),
  24         N_("git archive --remote <repo> [--exec <cmd>] --list"),
  25         NULL
  26 };
  27
  28 static const struct archiver **archivers;
  29 static int nr_archivers;
  30 static int alloc_archivers;
  31 static int remote_allow_unreachable;
  32
  33 void register_archiver(struct archiver *ar)
  34 {
  35         ALLOC_GROW(archivers, nr_archivers + 1, alloc_archivers);
  36         archivers[nr_archivers++] = ar;
  37 }
  38
  39 void init_archivers(void)
  40 {
  41         init_tar_archiver();
  42         init_zip_archiver();
  43 }
  44
  45 static void format_subst(const struct commit *commit,
  46                          const char *src, size_t len,
  47                          struct strbuf *buf, struct pretty_print_context *ctx)
  48 {
  49         char *to_free = NULL;
  50         struct strbuf fmt = STRBUF_INIT;
  51
  52         if (src == buf->buf)
  53                 to_free = strbuf_detach(buf, NULL);
  54         for (;;) {
  55                 const char *b, *c;
  56
  57                 b = memmem(src, len, "$Format:", 8);
  58                 if (!b)
  59                         break;
  60                 c = memchr(b + 8, '$', (src + len) - b - 8);
  61                 if (!c)
  62                         break;
  63
  64                 strbuf_reset(&fmt);
  65                 strbuf_add(&fmt, b + 8, c - b - 8);
  66
  67                 strbuf_add(buf, src, b - src);
  68                 format_commit_message(commit, fmt.buf, buf, ctx);
  69                 len -= c + 1 - src;
  70                 src  = c + 1;
  71         }
  72         strbuf_add(buf, src, len);
  73         strbuf_release(&fmt);
  74         free(to_free);
  75 }
  76
  77 static void *object_file_to_archive(const struct archiver_args *args,
  78                                     const char *path,
  79                                     const struct object_id *oid,
  80                                     unsigned int mode,
  81                                     enum object_type *type,
  82                                     unsigned long *sizep)
  83 {
  84         void *buffer;
  85         const struct commit *commit = args->convert ? args->commit : NULL;
  86         struct checkout_metadata meta;
  87
  88         init_checkout_metadata(&meta, args->refname,
  89                                args->commit_oid ? args->commit_oid :
  90                                (args->tree ? &args->tree->object.oid : NULL), oid);
  91
  92         path += args->baselen;
  93         buffer = read_object_file(oid, type, sizep);
  94         if (buffer && S_ISREG(mode)) {
  95                 struct strbuf buf = STRBUF_INIT;
  96                 size_t size = 0;
  97
  98                 strbuf_attach(&buf, buffer, *sizep, *sizep + 1);
  99                 convert_to_working_tree(args->repo->index, path, buf.buf, buf.len, &buf, &meta);
 100                 if (commit)
 101                         format_subst(commit, buf.buf, buf.len, &buf, args->pretty_ctx);
 102                 buffer = strbuf_detach(&buf, &size);
 103                 *sizep = size;
 104         }
 105
 106         return buffer;
 107 }
 108
 109 struct directory {
 110         struct directory *up;
 111         struct object_id oid;
 112         int baselen, len;
 113         unsigned mode;
 114         char path[FLEX_ARRAY];
 115 };
 116
 117 struct archiver_context {
 118         struct archiver_args *args;
 119         write_archive_entry_fn_t write_entry;
 120         struct directory *bottom;
 121 };
 122
 123 static const struct attr_check *get_archive_attrs(struct index_state *istate,
 124                                                   const char *path)
 125 {
 126         static struct attr_check *check;
 127         if (!check)
 128                 check = attr_check_initl("export-ignore", "export-subst", NULL);
 129         git_check_attr(istate, NULL, path, check);
 130         return check;
 131 }
 132
 133 static int check_attr_export_ignore(const struct attr_check *check)
 134 {
 135         return check && ATTR_TRUE(check->items[0].value);
 136 }
 137
 138 static int check_attr_export_subst(const struct attr_check *check)
 139 {
 140         return check && ATTR_TRUE(check->items[1].value);
 141 }
 142
 143 static int write_archive_entry(const struct object_id *oid, const char *base,
 144                 int baselen, const char *filename, unsigned mode,
 145                 void *context)
 146 {
 147         static struct strbuf path = STRBUF_INIT;
 148         struct archiver_context *c = context;
 149         struct archiver_args *args = c->args;
 150         write_archive_entry_fn_t write_entry = c->write_entry;
 151         int err;
 152         const char *path_without_prefix;
 153         unsigned long size;
 154         void *buffer;
 155         enum object_type type;
 156
 157         args->convert = 0;
 158         strbuf_reset(&path);
 159         strbuf_grow(&path, PATH_MAX);
 160         strbuf_add(&path, args->base, args->baselen);
 161         strbuf_add(&path, base, baselen);
 162         strbuf_addstr(&path, filename);
 163         if (S_ISDIR(mode) || S_ISGITLINK(mode))
 164                 strbuf_addch(&path, '/');
 165         path_without_prefix = path.buf + args->baselen;
 166
 167         if (!S_ISDIR(mode)) {
 168                 const struct attr_check *check;
 169                 check = get_archive_attrs(args->repo->index, path_without_prefix);
 170                 if (check_attr_export_ignore(check))
 171                         return 0;
 172                 args->convert = check_attr_export_subst(check);
 173         }
 174
 175         if (args->verbose)
 176                 fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
 177
 178         if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
 179                 err = write_entry(args, oid, path.buf, path.len, mode, NULL, 0);
 180                 if (err)
 181                         return err;
 182                 return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0);
 183         }
 184
 185         /* Stream it? */
 186         if (S_ISREG(mode) && !args->convert &&
 187             oid_object_info(args->repo, oid, &size) == OBJ_BLOB &&
 188             size > big_file_threshold)
 189                 return write_entry(args, oid, path.buf, path.len, mode, NULL, size);
 190
 191         buffer = object_file_to_archive(args, path.buf, oid, mode, &type, &size);
 192         if (!buffer)
 193                 return error(_("cannot read '%s'"), oid_to_hex(oid));
 194         err = write_entry(args, oid, path.buf, path.len, mode, buffer, size);
 195         free(buffer);
 196         return err;
 197 }
 198
 199 static void queue_directory(const struct object_id *oid,
 200                 struct strbuf *base, const char *filename,
 201                 unsigned mode, struct archiver_context *c)
 202 {
 203         struct directory *d;
 204         size_t len = st_add4(base->len, 1, strlen(filename), 1);
 205         d = xmalloc(st_add(sizeof(*d), len));
 206         d->up      = c->bottom;
 207         d->baselen = base->len;
 208         d->mode    = mode;
 209         c->bottom  = d;
 210         d->len = xsnprintf(d->path, len, "%.*s%s/", (int)base->len, base->buf, filename);
 211         oidcpy(&d->oid, oid);
 212 }
 213
 214 static int write_directory(struct archiver_context *c)
 215 {
 216         struct directory *d = c->bottom;
 217         int ret;
 218
 219         if (!d)
 220                 return 0;
 221         c->bottom = d->up;
 222         d->path[d->len - 1] = '\0'; /* no trailing slash */
 223         ret =
 224                 write_directory(c) ||
 225                 write_archive_entry(&d->oid, d->path, d->baselen,
 226                                     d->path + d->baselen, d->mode,
 227                                     c) != READ_TREE_RECURSIVE;
 228         free(d);
 229         return ret ? -1 : 0;
 230 }
 231
 232 static int queue_or_write_archive_entry(const struct object_id *oid,
 233                 struct strbuf *base, const char *filename,
 234                 unsigned mode, void *context)
 235 {
 236         struct archiver_context *c = context;
 237
 238         while (c->bottom &&
 239                !(base->len >= c->bottom->len &&
 240                  !strncmp(base->buf, c->bottom->path, c->bottom->len))) {
 241                 struct directory *next = c->bottom->up;
 242                 free(c->bottom);
 243                 c->bottom = next;
 244         }
 245
 246         if (S_ISDIR(mode)) {
 247                 size_t baselen = base->len;
 248                 const struct attr_check *check;
 249
 250                 /* Borrow base, but restore its original value when done. */
 251                 strbuf_addstr(base, filename);
 252                 strbuf_addch(base, '/');
 253                 check = get_archive_attrs(c->args->repo->index, base->buf);
 254                 strbuf_setlen(base, baselen);
 255
 256                 if (check_attr_export_ignore(check))
 257                         return 0;
 258                 queue_directory(oid, base, filename, mode, c);
 259                 return READ_TREE_RECURSIVE;
 260         }
 261
 262         if (write_directory(c))
 263                 return -1;
 264         return write_archive_entry(oid, base->buf, base->len, filename, mode,
 265                                    context);
 266 }
 267
 268 struct extra_file_info {
 269         char *base;
 270         struct stat stat;
 271         void *content;
 272 };
 273
 274 int write_archive_entries(struct archiver_args *args,
 275                 write_archive_entry_fn_t write_entry)
 276 {
 277         struct archiver_context context;
 278         struct unpack_trees_options opts;
 279         struct tree_desc t;
 280         int err;
 281         struct strbuf path_in_archive = STRBUF_INIT;
 282         struct strbuf content = STRBUF_INIT;
 283         struct object_id fake_oid;
 284         int i;
 285
 286         oidcpy(&fake_oid, null_oid());
 287
 288         if (args->baselen > 0 && args->base[args->baselen - 1] == '/') {
 289                 size_t len = args->baselen;
 290
 291                 while (len > 1 && args->base[len - 2] == '/')
 292                         len--;
 293                 if (args->verbose)
 294                         fprintf(stderr, "%.*s\n", (int)len, args->base);
 295                 err = write_entry(args, &args->tree->object.oid, args->base,
 296                                   len, 040777, NULL, 0);
 297                 if (err)
 298                         return err;
 299         }
 300
 301         memset(&context, 0, sizeof(context));
 302         context.args = args;
 303         context.write_entry = write_entry;
 304
 305         /*
 306          * Setup index and instruct attr to read index only
 307          */
 308         if (!args->worktree_attributes) {
 309                 memset(&opts, 0, sizeof(opts));
 310                 opts.index_only = 1;
 311                 opts.head_idx = -1;
 312                 opts.src_index = args->repo->index;
 313                 opts.dst_index = args->repo->index;
 314                 opts.fn = oneway_merge;
 315                 init_tree_desc(&t, args->tree->buffer, args->tree->size);
 316                 if (unpack_trees(1, &t, &opts))
 317                         return -1;
 318                 git_attr_set_direction(GIT_ATTR_INDEX);
 319         }
 320
 321         err = read_tree(args->repo, args->tree,
 322                         &args->pathspec,
 323                         queue_or_write_archive_entry,
 324                         &context);
 325         if (err == READ_TREE_RECURSIVE)
 326                 err = 0;
 327         while (context.bottom) {
 328                 struct directory *next = context.bottom->up;
 329                 free(context.bottom);
 330                 context.bottom = next;
 331         }
 332
 333         for (i = 0; i < args->extra_files.nr; i++) {
 334                 struct string_list_item *item = args->extra_files.items + i;
 335                 char *path = item->string;
 336                 struct extra_file_info *info = item->util;
 337
 338                 put_be64(fake_oid.hash, i + 1);
 339
 340                 if (!info->content) {
 341                         strbuf_reset(&path_in_archive);
 342                         if (info->base)
 343                                 strbuf_addstr(&path_in_archive, info->base);
 344                         strbuf_addstr(&path_in_archive, basename(path));
 345
 346                         strbuf_reset(&content);
 347                         if (strbuf_read_file(&content, path, info->stat.st_size) < 0)
 348                                 err = error_errno(_("cannot read '%s'"), path);
 349                         else
 350                                 err = write_entry(args, &fake_oid, path_in_archive.buf,
 351                                                   path_in_archive.len,
 352                                                   canon_mode(info->stat.st_mode),
 353                                                   content.buf, content.len);
 354                 } else {
 355                         err = write_entry(args, &fake_oid,
 356                                           path, strlen(path),
 357                                           canon_mode(info->stat.st_mode),
 358                                           info->content, info->stat.st_size);
 359                 }
 360
 361                 if (err)
 362                         break;
 363         }
 364         strbuf_release(&path_in_archive);
 365         strbuf_release(&content);
 366
 367         return err;
 368 }
 369
 370 static const struct archiver *lookup_archiver(const char *name)
 371 {
 372         int i;
 373
 374         if (!name)
 375                 return NULL;
 376
 377         for (i = 0; i < nr_archivers; i++) {
 378                 if (!strcmp(name, archivers[i]->name))
 379                         return archivers[i];
 380         }
 381         return NULL;
 382 }
 383
 384 struct path_exists_context {
 385         struct pathspec pathspec;
 386         struct archiver_args *args;
 387 };
 388
 389 static int reject_entry(const struct object_id *oid UNUSED,
 390                         struct strbuf *base,
 391                         const char *filename, unsigned mode,
 392                         void *context)
 393 {
 394         int ret = -1;
 395         struct path_exists_context *ctx = context;
 396
 397         if (S_ISDIR(mode)) {
 398                 struct strbuf sb = STRBUF_INIT;
 399                 strbuf_addbuf(&sb, base);
 400                 strbuf_addstr(&sb, filename);
 401                 if (!match_pathspec(ctx->args->repo->index,
 402                                     &ctx->pathspec,
 403                                     sb.buf, sb.len, 0, NULL, 1))
 404                         ret = READ_TREE_RECURSIVE;
 405                 strbuf_release(&sb);
 406         }
 407         return ret;
 408 }
 409
 410 static int path_exists(struct archiver_args *args, const char *path)
 411 {
 412         const char *paths[] = { path, NULL };
 413         struct path_exists_context ctx;
 414         int ret;
 415
 416         ctx.args = args;
 417         parse_pathspec(&ctx.pathspec, 0, 0, "", paths);
 418         ctx.pathspec.recursive = 1;
 419         ret = read_tree(args->repo, args->tree,
 420                         &ctx.pathspec,
 421                         reject_entry, &ctx);
 422         clear_pathspec(&ctx.pathspec);
 423         return ret != 0;
 424 }
 425
 426 static void parse_pathspec_arg(const char **pathspec,
 427                 struct archiver_args *ar_args)
 428 {
 429         /*
 430          * must be consistent with parse_pathspec in path_exists()
 431          * Also if pathspec patterns are dependent, we're in big
 432          * trouble as we test each one separately
 433          */
 434         parse_pathspec(&ar_args->pathspec, 0,
 435                        PATHSPEC_PREFER_FULL,
 436                        "", pathspec);
 437         ar_args->pathspec.recursive = 1;
 438         if (pathspec) {
 439                 while (*pathspec) {
 440                         if (**pathspec && !path_exists(ar_args, *pathspec))
 441                                 die(_("pathspec '%s' did not match any files"), *pathspec);
 442                         pathspec++;
 443                 }
 444         }
 445 }
 446
 447 static void parse_treeish_arg(const char **argv,
 448                 struct archiver_args *ar_args, const char *prefix,
 449                 int remote)
 450 {
 451         const char *name = argv[0];
 452         const struct object_id *commit_oid;
 453         time_t archive_time;
 454         struct tree *tree;
 455         const struct commit *commit;
 456         struct object_id oid;
 457         char *ref = NULL;
 458
 459         /* Remotes are only allowed to fetch actual refs */
 460         if (remote && !remote_allow_unreachable) {
 461                 const char *colon = strchrnul(name, ':');
 462                 int refnamelen = colon - name;
 463
 464                 if (!dwim_ref(name, refnamelen, &oid, &ref, 0))
 465                         die(_("no such ref: %.*s"), refnamelen, name);
 466         } else {
 467                 dwim_ref(name, strlen(name), &oid, &ref, 0);
 468         }
 469
 470         if (get_oid(name, &oid))
 471                 die(_("not a valid object name: %s"), name);
 472
 473         commit = lookup_commit_reference_gently(ar_args->repo, &oid, 1);
 474         if (commit) {
 475                 commit_oid = &commit->object.oid;
 476                 archive_time = commit->date;
 477         } else {
 478                 commit_oid = NULL;
 479                 archive_time = time(NULL);
 480         }
 481         if (ar_args->mtime_option)
 482                 archive_time = approxidate(ar_args->mtime_option);
 483
 484         tree = parse_tree_indirect(&oid);
 485         if (!tree)
 486                 die(_("not a tree object: %s"), oid_to_hex(&oid));
 487
 488         if (prefix) {
 489                 struct object_id tree_oid;
 490                 unsigned short mode;
 491                 int err;
 492
 493                 err = get_tree_entry(ar_args->repo,
 494                                      &tree->object.oid,
 495                                      prefix, &tree_oid,
 496                                      &mode);
 497                 if (err || !S_ISDIR(mode))
 498                         die(_("current working directory is untracked"));
 499
 500                 tree = parse_tree_indirect(&tree_oid);
 501         }
 502         ar_args->refname = ref;
 503         ar_args->tree = tree;
 504         ar_args->commit_oid = commit_oid;
 505         ar_args->commit = commit;
 506         ar_args->time = archive_time;
 507 }
 508
 509 static void extra_file_info_clear(void *util, const char *str UNUSED)
 510 {
 511         struct extra_file_info *info = util;
 512         free(info->base);
 513         free(info->content);
 514         free(info);
 515 }
 516
 517 static int add_file_cb(const struct option *opt, const char *arg, int unset)
 518 {
 519         struct archiver_args *args = opt->value;
 520         const char **basep = (const char **)opt->defval;
 521         const char *base = *basep;
 522         char *path;
 523         struct string_list_item *item;
 524         struct extra_file_info *info;
 525
 526         if (unset) {
 527                 string_list_clear_func(&args->extra_files,
 528                                        extra_file_info_clear);
 529                 return 0;
 530         }
 531
 532         if (!arg)
 533                 return -1;
 534
 535         info = xmalloc(sizeof(*info));
 536         info->base = xstrdup_or_null(base);
 537
 538         if (!strcmp(opt->long_name, "add-file")) {
 539                 path = prefix_filename(args->prefix, arg);
 540                 if (stat(path, &info->stat))
 541                         die(_("File not found: %s"), path);
 542                 if (!S_ISREG(info->stat.st_mode))
 543                         die(_("Not a regular file: %s"), path);
 544                 info->content = NULL; /* read the file later */
 545         } else if (!strcmp(opt->long_name, "add-virtual-file")) {
 546                 struct strbuf buf = STRBUF_INIT;
 547                 const char *p = arg;
 548
 549                 if (*p != '"')
 550                         p = strchr(p, ':');
 551                 else if (unquote_c_style(&buf, p, &p) < 0)
 552                         die(_("unclosed quote: '%s'"), arg);
 553
 554                 if (!p || *p != ':')
 555                         die(_("missing colon: '%s'"), arg);
 556
 557                 if (p == arg)
 558                         die(_("empty file name: '%s'"), arg);
 559
 560                 path = buf.len ?
 561                         strbuf_detach(&buf, NULL) : xstrndup(arg, p - arg);
 562
 563                 if (args->prefix) {
 564                         char *save = path;
 565                         path = prefix_filename(args->prefix, path);
 566                         free(save);
 567                 }
 568                 memset(&info->stat, 0, sizeof(info->stat));
 569                 info->stat.st_mode = S_IFREG | 0644;
 570                 info->content = xstrdup(p + 1);
 571                 info->stat.st_size = strlen(info->content);
 572         } else {
 573                 BUG("add_file_cb() called for %s", opt->long_name);
 574         }
 575         item = string_list_append_nodup(&args->extra_files, path);
 576         item->util = info;
 577
 578         return 0;
 579 }
 580
 581 static int number_callback(const struct option *opt, const char *arg, int unset)
 582 {
 583         BUG_ON_OPT_NEG(unset);
 584         *(int *)opt->value = strtol(arg, NULL, 10);
 585         return 0;
 586 }
 587
 588 static int parse_archive_args(int argc, const char **argv,
 589                 const struct archiver **ar, struct archiver_args *args,
 590                 const char *name_hint, int is_remote)
 591 {
 592         const char *format = NULL;
 593         const char *base = NULL;
 594         const char *remote = NULL;
 595         const char *exec = NULL;
 596         const char *output = NULL;
 597         const char *mtime_option = NULL;
 598         int compression_level = -1;
 599         int verbose = 0;
 600         int i;
 601         int list = 0;
 602         int worktree_attributes = 0;
 603         struct option opts[] = {
 604                 OPT_GROUP(""),
 605                 OPT_STRING(0, "format", &format, N_("fmt"), N_("archive format")),
 606                 OPT_STRING(0, "prefix", &base, N_("prefix"),
 607                         N_("prepend prefix to each pathname in the archive")),
 608                 { OPTION_CALLBACK, 0, "add-file", args, N_("file"),
 609                   N_("add untracked file to archive"), 0, add_file_cb,
 610                   (intptr_t)&base },
 611                 { OPTION_CALLBACK, 0, "add-virtual-file", args,
 612                   N_("path:content"), N_("add untracked file to archive"), 0,
 613                   add_file_cb, (intptr_t)&base },
 614                 OPT_STRING('o', "output", &output, N_("file"),
 615                         N_("write the archive to this file")),
 616                 OPT_BOOL(0, "worktree-attributes", &worktree_attributes,
 617                         N_("read .gitattributes in working directory")),
 618                 OPT__VERBOSE(&verbose, N_("report archived files on stderr")),
 619                 { OPTION_STRING, 0, "mtime", &mtime_option, N_("time"),
 620                   N_("set modification time of archive entries"),
 621                   PARSE_OPT_NONEG },
 622                 OPT_NUMBER_CALLBACK(&compression_level,
 623                         N_("set compression level"), number_callback),
 624                 OPT_GROUP(""),
 625                 OPT_BOOL('l', "list", &list,
 626                         N_("list supported archive formats")),
 627                 OPT_GROUP(""),
 628                 OPT_STRING(0, "remote", &remote, N_("repo"),
 629                         N_("retrieve the archive from remote repository <repo>")),
 630                 OPT_STRING(0, "exec", &exec, N_("command"),
 631                         N_("path to the remote git-upload-archive command")),
 632                 OPT_END()
 633         };
 634
 635         argc = parse_options(argc, argv, NULL, opts, archive_usage, 0);
 636
 637         if (remote)
 638                 die(_("Unexpected option --remote"));
 639         if (exec)
 640                 die(_("the option '%s' requires '%s'"), "--exec", "--remote");
 641         if (output)
 642                 die(_("Unexpected option --output"));
 643         if (is_remote && args->extra_files.nr)
 644                 die(_("options '%s' and '%s' cannot be used together"), "--add-file", "--remote");
 645
 646         if (!base)
 647                 base = "";
 648
 649         if (list) {
 650                 for (i = 0; i < nr_archivers; i++)
 651                         if (!is_remote || archivers[i]->flags & ARCHIVER_REMOTE)
 652                                 printf("%s\n", archivers[i]->name);
 653                 exit(0);
 654         }
 655
 656         if (!format && name_hint)
 657                 format = archive_format_from_filename(name_hint);
 658         if (!format)
 659                 format = "tar";
 660
 661         /* We need at least one parameter -- tree-ish */
 662         if (argc < 1)
 663                 usage_with_options(archive_usage, opts);
 664         *ar = lookup_archiver(format);
 665         if (!*ar || (is_remote && !((*ar)->flags & ARCHIVER_REMOTE)))
 666                 die(_("Unknown archive format '%s'"), format);
 667
 668         args->compression_level = Z_DEFAULT_COMPRESSION;
 669         if (compression_level != -1) {
 670                 int levels_ok = (*ar)->flags & ARCHIVER_WANT_COMPRESSION_LEVELS;
 671                 int high_ok = (*ar)->flags & ARCHIVER_HIGH_COMPRESSION_LEVELS;
 672                 if (levels_ok && (compression_level <= 9 || high_ok))
 673                         args->compression_level = compression_level;
 674                 else {
 675                         die(_("Argument not supported for format '%s': -%d"),
 676                                         format, compression_level);
 677                 }
 678         }
 679         args->verbose = verbose;
 680         args->base = base;
 681         args->baselen = strlen(base);
 682         args->worktree_attributes = worktree_attributes;
 683         args->mtime_option = mtime_option;
 684
 685         return argc;
 686 }
 687
 688 int write_archive(int argc, const char **argv, const char *prefix,
 689                   struct repository *repo,
 690                   const char *name_hint, int remote)
 691 {
 692         const struct archiver *ar = NULL;
 693         struct pretty_print_describe_status describe_status = {0};
 694         struct pretty_print_context ctx = {0};
 695         struct archiver_args args;
 696         int rc;
 697
 698         git_config_get_bool("uploadarchive.allowunreachable", &remote_allow_unreachable);
 699         git_config(git_default_config, NULL);
 700
 701         describe_status.max_invocations = 1;
 702         ctx.date_mode.type = DATE_NORMAL;
 703         ctx.abbrev = DEFAULT_ABBREV;
 704         ctx.describe_status = &describe_status;
 705         args.pretty_ctx = &ctx;
 706         args.repo = repo;
 707         args.prefix = prefix;
 708         string_list_init_dup(&args.extra_files);
 709         argc = parse_archive_args(argc, argv, &ar, &args, name_hint, remote);
 710         if (!startup_info->have_repository) {
 711                 /*
 712                  * We know this will die() with an error, so we could just
 713                  * die ourselves; but its error message will be more specific
 714                  * than what we could write here.
 715                  */
 716                 setup_git_directory();
 717         }
 718
 719         parse_treeish_arg(argv, &args, prefix, remote);
 720         parse_pathspec_arg(argv + 1, &args);
 721
 722         rc = ar->write_archive(ar, &args);
 723
 724         string_list_clear_func(&args.extra_files, extra_file_info_clear);
 725         free(args.refname);
 726         clear_pathspec(&args.pathspec);
 727
 728         return rc;
 729 }
 730
 731 static int match_extension(const char *filename, const char *ext)
 732 {
 733         int prefixlen = strlen(filename) - strlen(ext);
 734
 735         /*
 736          * We need 1 character for the '.', and 1 character to ensure that the
 737          * prefix is non-empty (k.e., we don't match .tar.gz with no actual
 738          * filename).
 739          */
 740         if (prefixlen < 2 || filename[prefixlen - 1] != '.')
 741                 return 0;
 742         return !strcmp(filename + prefixlen, ext);
 743 }
 744
 745 const char *archive_format_from_filename(const char *filename)
 746 {
 747         int i;
 748
 749         for (i = 0; i < nr_archivers; i++)
 750                 if (match_extension(filename, archivers[i]->name))
 751                         return archivers[i]->name;
 752         return NULL;
 753 }