archive.c

   1 #include "git-compat-util.h"
   2 #include "abspath.h"
   3 #include "alloc.h"
   4 #include "config.h"
   5 #include "convert.h"
   6 #include "environment.h"
   7 #include "gettext.h"
   8 #include "hex.h"
   9 #include "setup.h"
  10 #include "refs.h"
  11 #include "object-store.h"
  12 #include "commit.h"
  13 #include "tree-walk.h"
  14 #include "attr.h"
  15 #include "archive.h"
  16 #include "parse-options.h"
  17 #include "unpack-trees.h"
  18 #include "dir.h"
  19 #include "quote.h"
  20
  21 static char const * const archive_usage[] = {
  22         N_("git archive [<options>] <tree-ish> [<path>...]"),
  23         "git archive --list",
  24         N_("git archive --remote <repo> [--exec <cmd>] [<options>] <tree-ish> [<path>...]"),
  25         N_("git archive --remote <repo> [--exec <cmd>] --list"),
  26         NULL
  27 };
  28
  29 static const struct archiver **archivers;
  30 static int nr_archivers;
  31 static int alloc_archivers;
  32 static int remote_allow_unreachable;
  33
  34 void register_archiver(struct archiver *ar)
  35 {
  36         ALLOC_GROW(archivers, nr_archivers + 1, alloc_archivers);
  37         archivers[nr_archivers++] = ar;
  38 }
  39
  40 void init_archivers(void)
  41 {
  42         init_tar_archiver();
  43         init_zip_archiver();
  44 }
  45
  46 static void format_subst(const struct commit *commit,
  47                          const char *src, size_t len,
  48                          struct strbuf *buf, struct pretty_print_context *ctx)
  49 {
  50         char *to_free = NULL;
  51         struct strbuf fmt = STRBUF_INIT;
  52
  53         if (src == buf->buf)
  54                 to_free = strbuf_detach(buf, NULL);
  55         for (;;) {
  56                 const char *b, *c;
  57
  58                 b = memmem(src, len, "$Format:", 8);
  59                 if (!b)
  60                         break;
  61                 c = memchr(b + 8, '$', (src + len) - b - 8);
  62                 if (!c)
  63                         break;
  64
  65                 strbuf_reset(&fmt);
  66                 strbuf_add(&fmt, b + 8, c - b - 8);
  67
  68                 strbuf_add(buf, src, b - src);
  69                 repo_format_commit_message(the_repository, commit, fmt.buf,
  70                                            buf, ctx);
  71                 len -= c + 1 - src;
  72                 src  = c + 1;
  73         }
  74         strbuf_add(buf, src, len);
  75         strbuf_release(&fmt);
  76         free(to_free);
  77 }
  78
  79 static void *object_file_to_archive(const struct archiver_args *args,
  80                                     const char *path,
  81                                     const struct object_id *oid,
  82                                     unsigned int mode,
  83                                     enum object_type *type,
  84                                     unsigned long *sizep)
  85 {
  86         void *buffer;
  87         const struct commit *commit = args->convert ? args->commit : NULL;
  88         struct checkout_metadata meta;
  89
  90         init_checkout_metadata(&meta, args->refname,
  91                                args->commit_oid ? args->commit_oid :
  92                                (args->tree ? &args->tree->object.oid : NULL), oid);
  93
  94         path += args->baselen;
  95         buffer = repo_read_object_file(the_repository, oid, type, sizep);
  96         if (buffer && S_ISREG(mode)) {
  97                 struct strbuf buf = STRBUF_INIT;
  98                 size_t size = 0;
  99
 100                 strbuf_attach(&buf, buffer, *sizep, *sizep + 1);
 101                 convert_to_working_tree(args->repo->index, path, buf.buf, buf.len, &buf, &meta);
 102                 if (commit)
 103                         format_subst(commit, buf.buf, buf.len, &buf, args->pretty_ctx);
 104                 buffer = strbuf_detach(&buf, &size);
 105                 *sizep = size;
 106         }
 107
 108         return buffer;
 109 }
 110
 111 struct directory {
 112         struct directory *up;
 113         struct object_id oid;
 114         int baselen, len;
 115         unsigned mode;
 116         char path[FLEX_ARRAY];
 117 };
 118
 119 struct archiver_context {
 120         struct archiver_args *args;
 121         write_archive_entry_fn_t write_entry;
 122         struct directory *bottom;
 123 };
 124
 125 static const struct attr_check *get_archive_attrs(struct index_state *istate,
 126                                                   const char *path)
 127 {
 128         static struct attr_check *check;
 129         if (!check)
 130                 check = attr_check_initl("export-ignore", "export-subst", NULL);
 131         git_check_attr(istate, NULL, path, check);
 132         return check;
 133 }
 134
 135 static int check_attr_export_ignore(const struct attr_check *check)
 136 {
 137         return check && ATTR_TRUE(check->items[0].value);
 138 }
 139
 140 static int check_attr_export_subst(const struct attr_check *check)
 141 {
 142         return check && ATTR_TRUE(check->items[1].value);
 143 }
 144
 145 static int write_archive_entry(const struct object_id *oid, const char *base,
 146                 int baselen, const char *filename, unsigned mode,
 147                 void *context)
 148 {
 149         static struct strbuf path = STRBUF_INIT;
 150         struct archiver_context *c = context;
 151         struct archiver_args *args = c->args;
 152         write_archive_entry_fn_t write_entry = c->write_entry;
 153         int err;
 154         const char *path_without_prefix;
 155         unsigned long size;
 156         void *buffer;
 157         enum object_type type;
 158
 159         args->convert = 0;
 160         strbuf_reset(&path);
 161         strbuf_grow(&path, PATH_MAX);
 162         strbuf_add(&path, args->base, args->baselen);
 163         strbuf_add(&path, base, baselen);
 164         strbuf_addstr(&path, filename);
 165         if (S_ISDIR(mode) || S_ISGITLINK(mode))
 166                 strbuf_addch(&path, '/');
 167         path_without_prefix = path.buf + args->baselen;
 168
 169         if (!S_ISDIR(mode)) {
 170                 const struct attr_check *check;
 171                 check = get_archive_attrs(args->repo->index, path_without_prefix);
 172                 if (check_attr_export_ignore(check))
 173                         return 0;
 174                 args->convert = check_attr_export_subst(check);
 175         }
 176
 177         if (args->verbose)
 178                 fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
 179
 180         if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
 181                 err = write_entry(args, oid, path.buf, path.len, mode, NULL, 0);
 182                 if (err)
 183                         return err;
 184                 return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0);
 185         }
 186
 187         /* Stream it? */
 188         if (S_ISREG(mode) && !args->convert &&
 189             oid_object_info(args->repo, oid, &size) == OBJ_BLOB &&
 190             size > big_file_threshold)
 191                 return write_entry(args, oid, path.buf, path.len, mode, NULL, size);
 192
 193         buffer = object_file_to_archive(args, path.buf, oid, mode, &type, &size);
 194         if (!buffer)
 195                 return error(_("cannot read '%s'"), oid_to_hex(oid));
 196         err = write_entry(args, oid, path.buf, path.len, mode, buffer, size);
 197         free(buffer);
 198         return err;
 199 }
 200
 201 static void queue_directory(const struct object_id *oid,
 202                 struct strbuf *base, const char *filename,
 203                 unsigned mode, struct archiver_context *c)
 204 {
 205         struct directory *d;
 206         size_t len = st_add4(base->len, 1, strlen(filename), 1);
 207         d = xmalloc(st_add(sizeof(*d), len));
 208         d->up      = c->bottom;
 209         d->baselen = base->len;
 210         d->mode    = mode;
 211         c->bottom  = d;
 212         d->len = xsnprintf(d->path, len, "%.*s%s/", (int)base->len, base->buf, filename);
 213         oidcpy(&d->oid, oid);
 214 }
 215
 216 static int write_directory(struct archiver_context *c)
 217 {
 218         struct directory *d = c->bottom;
 219         int ret;
 220
 221         if (!d)
 222                 return 0;
 223         c->bottom = d->up;
 224         d->path[d->len - 1] = '\0'; /* no trailing slash */
 225         ret =
 226                 write_directory(c) ||
 227                 write_archive_entry(&d->oid, d->path, d->baselen,
 228                                     d->path + d->baselen, d->mode,
 229                                     c) != READ_TREE_RECURSIVE;
 230         free(d);
 231         return ret ? -1 : 0;
 232 }
 233
 234 static int queue_or_write_archive_entry(const struct object_id *oid,
 235                 struct strbuf *base, const char *filename,
 236                 unsigned mode, void *context)
 237 {
 238         struct archiver_context *c = context;
 239
 240         while (c->bottom &&
 241                !(base->len >= c->bottom->len &&
 242                  !strncmp(base->buf, c->bottom->path, c->bottom->len))) {
 243                 struct directory *next = c->bottom->up;
 244                 free(c->bottom);
 245                 c->bottom = next;
 246         }
 247
 248         if (S_ISDIR(mode)) {
 249                 size_t baselen = base->len;
 250                 const struct attr_check *check;
 251
 252                 /* Borrow base, but restore its original value when done. */
 253                 strbuf_addstr(base, filename);
 254                 strbuf_addch(base, '/');
 255                 check = get_archive_attrs(c->args->repo->index, base->buf);
 256                 strbuf_setlen(base, baselen);
 257
 258                 if (check_attr_export_ignore(check))
 259                         return 0;
 260                 queue_directory(oid, base, filename, mode, c);
 261                 return READ_TREE_RECURSIVE;
 262         }
 263
 264         if (write_directory(c))
 265                 return -1;
 266         return write_archive_entry(oid, base->buf, base->len, filename, mode,
 267                                    context);
 268 }
 269
 270 struct extra_file_info {
 271         char *base;
 272         struct stat stat;
 273         void *content;
 274 };
 275
 276 int write_archive_entries(struct archiver_args *args,
 277                 write_archive_entry_fn_t write_entry)
 278 {
 279         struct archiver_context context;
 280         struct unpack_trees_options opts;
 281         struct tree_desc t;
 282         int err;
 283         struct strbuf path_in_archive = STRBUF_INIT;
 284         struct strbuf content = STRBUF_INIT;
 285         struct object_id fake_oid;
 286         int i;
 287
 288         oidcpy(&fake_oid, null_oid());
 289
 290         if (args->baselen > 0 && args->base[args->baselen - 1] == '/') {
 291                 size_t len = args->baselen;
 292
 293                 while (len > 1 && args->base[len - 2] == '/')
 294                         len--;
 295                 if (args->verbose)
 296                         fprintf(stderr, "%.*s\n", (int)len, args->base);
 297                 err = write_entry(args, &args->tree->object.oid, args->base,
 298                                   len, 040777, NULL, 0);
 299                 if (err)
 300                         return err;
 301         }
 302
 303         memset(&context, 0, sizeof(context));
 304         context.args = args;
 305         context.write_entry = write_entry;
 306
 307         /*
 308          * Setup index and instruct attr to read index only
 309          */
 310         if (!args->worktree_attributes) {
 311                 memset(&opts, 0, sizeof(opts));
 312                 opts.index_only = 1;
 313                 opts.head_idx = -1;
 314                 opts.src_index = args->repo->index;
 315                 opts.dst_index = args->repo->index;
 316                 opts.fn = oneway_merge;
 317                 init_tree_desc(&t, args->tree->buffer, args->tree->size);
 318                 if (unpack_trees(1, &t, &opts))
 319                         return -1;
 320                 git_attr_set_direction(GIT_ATTR_INDEX);
 321         }
 322
 323         err = read_tree(args->repo, args->tree,
 324                         &args->pathspec,
 325                         queue_or_write_archive_entry,
 326                         &context);
 327         if (err == READ_TREE_RECURSIVE)
 328                 err = 0;
 329         while (context.bottom) {
 330                 struct directory *next = context.bottom->up;
 331                 free(context.bottom);
 332                 context.bottom = next;
 333         }
 334
 335         for (i = 0; i < args->extra_files.nr; i++) {
 336                 struct string_list_item *item = args->extra_files.items + i;
 337                 char *path = item->string;
 338                 struct extra_file_info *info = item->util;
 339
 340                 put_be64(fake_oid.hash, i + 1);
 341
 342                 if (!info->content) {
 343                         strbuf_reset(&path_in_archive);
 344                         if (info->base)
 345                                 strbuf_addstr(&path_in_archive, info->base);
 346                         strbuf_addstr(&path_in_archive, basename(path));
 347
 348                         strbuf_reset(&content);
 349                         if (strbuf_read_file(&content, path, info->stat.st_size) < 0)
 350                                 err = error_errno(_("cannot read '%s'"), path);
 351                         else
 352                                 err = write_entry(args, &fake_oid, path_in_archive.buf,
 353                                                   path_in_archive.len,
 354                                                   canon_mode(info->stat.st_mode),
 355                                                   content.buf, content.len);
 356                 } else {
 357                         err = write_entry(args, &fake_oid,
 358                                           path, strlen(path),
 359                                           canon_mode(info->stat.st_mode),
 360                                           info->content, info->stat.st_size);
 361                 }
 362
 363                 if (err)
 364                         break;
 365         }
 366         strbuf_release(&path_in_archive);
 367         strbuf_release(&content);
 368
 369         return err;
 370 }
 371
 372 static const struct archiver *lookup_archiver(const char *name)
 373 {
 374         int i;
 375
 376         if (!name)
 377                 return NULL;
 378
 379         for (i = 0; i < nr_archivers; i++) {
 380                 if (!strcmp(name, archivers[i]->name))
 381                         return archivers[i];
 382         }
 383         return NULL;
 384 }
 385
 386 struct path_exists_context {
 387         struct pathspec pathspec;
 388         struct archiver_args *args;
 389 };
 390
 391 static int reject_entry(const struct object_id *oid UNUSED,
 392                         struct strbuf *base,
 393                         const char *filename, unsigned mode,
 394                         void *context)
 395 {
 396         int ret = -1;
 397         struct path_exists_context *ctx = context;
 398
 399         if (S_ISDIR(mode)) {
 400                 struct strbuf sb = STRBUF_INIT;
 401                 strbuf_addbuf(&sb, base);
 402                 strbuf_addstr(&sb, filename);
 403                 if (!match_pathspec(ctx->args->repo->index,
 404                                     &ctx->pathspec,
 405                                     sb.buf, sb.len, 0, NULL, 1))
 406                         ret = READ_TREE_RECURSIVE;
 407                 strbuf_release(&sb);
 408         }
 409         return ret;
 410 }
 411
 412 static int path_exists(struct archiver_args *args, const char *path)
 413 {
 414         const char *paths[] = { path, NULL };
 415         struct path_exists_context ctx;
 416         int ret;
 417
 418         ctx.args = args;
 419         parse_pathspec(&ctx.pathspec, 0, 0, "", paths);
 420         ctx.pathspec.recursive = 1;
 421         ret = read_tree(args->repo, args->tree,
 422                         &ctx.pathspec,
 423                         reject_entry, &ctx);
 424         clear_pathspec(&ctx.pathspec);
 425         return ret != 0;
 426 }
 427
 428 static void parse_pathspec_arg(const char **pathspec,
 429                 struct archiver_args *ar_args)
 430 {
 431         /*
 432          * must be consistent with parse_pathspec in path_exists()
 433          * Also if pathspec patterns are dependent, we're in big
 434          * trouble as we test each one separately
 435          */
 436         parse_pathspec(&ar_args->pathspec, 0,
 437                        PATHSPEC_PREFER_FULL,
 438                        "", pathspec);
 439         ar_args->pathspec.recursive = 1;
 440         if (pathspec) {
 441                 while (*pathspec) {
 442                         if (**pathspec && !path_exists(ar_args, *pathspec))
 443                                 die(_("pathspec '%s' did not match any files"), *pathspec);
 444                         pathspec++;
 445                 }
 446         }
 447 }
 448
 449 static void parse_treeish_arg(const char **argv,
 450                 struct archiver_args *ar_args, const char *prefix,
 451                 int remote)
 452 {
 453         const char *name = argv[0];
 454         const struct object_id *commit_oid;
 455         time_t archive_time;
 456         struct tree *tree;
 457         const struct commit *commit;
 458         struct object_id oid;
 459         char *ref = NULL;
 460
 461         /* Remotes are only allowed to fetch actual refs */
 462         if (remote && !remote_allow_unreachable) {
 463                 const char *colon = strchrnul(name, ':');
 464                 int refnamelen = colon - name;
 465
 466                 if (!repo_dwim_ref(the_repository, name, refnamelen, &oid, &ref, 0))
 467                         die(_("no such ref: %.*s"), refnamelen, name);
 468         } else {
 469                 repo_dwim_ref(the_repository, name, strlen(name), &oid, &ref,
 470                               0);
 471         }
 472
 473         if (repo_get_oid(the_repository, name, &oid))
 474                 die(_("not a valid object name: %s"), name);
 475
 476         commit = lookup_commit_reference_gently(ar_args->repo, &oid, 1);
 477         if (commit) {
 478                 commit_oid = &commit->object.oid;
 479                 archive_time = commit->date;
 480         } else {
 481                 commit_oid = NULL;
 482                 archive_time = time(NULL);
 483         }
 484         if (ar_args->mtime_option)
 485                 archive_time = approxidate(ar_args->mtime_option);
 486
 487         tree = parse_tree_indirect(&oid);
 488         if (!tree)
 489                 die(_("not a tree object: %s"), oid_to_hex(&oid));
 490
 491         if (prefix) {
 492                 struct object_id tree_oid;
 493                 unsigned short mode;
 494                 int err;
 495
 496                 err = get_tree_entry(ar_args->repo,
 497                                      &tree->object.oid,
 498                                      prefix, &tree_oid,
 499                                      &mode);
 500                 if (err || !S_ISDIR(mode))
 501                         die(_("current working directory is untracked"));
 502
 503                 tree = parse_tree_indirect(&tree_oid);
 504         }
 505         ar_args->refname = ref;
 506         ar_args->tree = tree;
 507         ar_args->commit_oid = commit_oid;
 508         ar_args->commit = commit;
 509         ar_args->time = archive_time;
 510 }
 511
 512 static void extra_file_info_clear(void *util, const char *str UNUSED)
 513 {
 514         struct extra_file_info *info = util;
 515         free(info->base);
 516         free(info->content);
 517         free(info);
 518 }
 519
 520 static int add_file_cb(const struct option *opt, const char *arg, int unset)
 521 {
 522         struct archiver_args *args = opt->value;
 523         const char **basep = (const char **)opt->defval;
 524         const char *base = *basep;
 525         char *path;
 526         struct string_list_item *item;
 527         struct extra_file_info *info;
 528
 529         if (unset) {
 530                 string_list_clear_func(&args->extra_files,
 531                                        extra_file_info_clear);
 532                 return 0;
 533         }
 534
 535         if (!arg)
 536                 return -1;
 537
 538         info = xmalloc(sizeof(*info));
 539         info->base = xstrdup_or_null(base);
 540
 541         if (!strcmp(opt->long_name, "add-file")) {
 542                 path = prefix_filename(args->prefix, arg);
 543                 if (stat(path, &info->stat))
 544                         die(_("File not found: %s"), path);
 545                 if (!S_ISREG(info->stat.st_mode))
 546                         die(_("Not a regular file: %s"), path);
 547                 info->content = NULL; /* read the file later */
 548         } else if (!strcmp(opt->long_name, "add-virtual-file")) {
 549                 struct strbuf buf = STRBUF_INIT;
 550                 const char *p = arg;
 551
 552                 if (*p != '"')
 553                         p = strchr(p, ':');
 554                 else if (unquote_c_style(&buf, p, &p) < 0)
 555                         die(_("unclosed quote: '%s'"), arg);
 556
 557                 if (!p || *p != ':')
 558                         die(_("missing colon: '%s'"), arg);
 559
 560                 if (p == arg)
 561                         die(_("empty file name: '%s'"), arg);
 562
 563                 path = buf.len ?
 564                         strbuf_detach(&buf, NULL) : xstrndup(arg, p - arg);
 565
 566                 if (args->prefix) {
 567                         char *save = path;
 568                         path = prefix_filename(args->prefix, path);
 569                         free(save);
 570                 }
 571                 memset(&info->stat, 0, sizeof(info->stat));
 572                 info->stat.st_mode = S_IFREG | 0644;
 573                 info->content = xstrdup(p + 1);
 574                 info->stat.st_size = strlen(info->content);
 575         } else {
 576                 BUG("add_file_cb() called for %s", opt->long_name);
 577         }
 578         item = string_list_append_nodup(&args->extra_files, path);
 579         item->util = info;
 580
 581         return 0;
 582 }
 583
 584 static int number_callback(const struct option *opt, const char *arg, int unset)
 585 {
 586         BUG_ON_OPT_NEG(unset);
 587         *(int *)opt->value = strtol(arg, NULL, 10);
 588         return 0;
 589 }
 590
 591 static int parse_archive_args(int argc, const char **argv,
 592                 const struct archiver **ar, struct archiver_args *args,
 593                 const char *name_hint, int is_remote)
 594 {
 595         const char *format = NULL;
 596         const char *base = NULL;
 597         const char *remote = NULL;
 598         const char *exec = NULL;
 599         const char *output = NULL;
 600         const char *mtime_option = NULL;
 601         int compression_level = -1;
 602         int verbose = 0;
 603         int i;
 604         int list = 0;
 605         int worktree_attributes = 0;
 606         struct option opts[] = {
 607                 OPT_GROUP(""),
 608                 OPT_STRING(0, "format", &format, N_("fmt"), N_("archive format")),
 609                 OPT_STRING(0, "prefix", &base, N_("prefix"),
 610                         N_("prepend prefix to each pathname in the archive")),
 611                 { OPTION_CALLBACK, 0, "add-file", args, N_("file"),
 612                   N_("add untracked file to archive"), 0, add_file_cb,
 613                   (intptr_t)&base },
 614                 { OPTION_CALLBACK, 0, "add-virtual-file", args,
 615                   N_("path:content"), N_("add untracked file to archive"), 0,
 616                   add_file_cb, (intptr_t)&base },
 617                 OPT_STRING('o', "output", &output, N_("file"),
 618                         N_("write the archive to this file")),
 619                 OPT_BOOL(0, "worktree-attributes", &worktree_attributes,
 620                         N_("read .gitattributes in working directory")),
 621                 OPT__VERBOSE(&verbose, N_("report archived files on stderr")),
 622                 { OPTION_STRING, 0, "mtime", &mtime_option, N_("time"),
 623                   N_("set modification time of archive entries"),
 624                   PARSE_OPT_NONEG },
 625                 OPT_NUMBER_CALLBACK(&compression_level,
 626                         N_("set compression level"), number_callback),
 627                 OPT_GROUP(""),
 628                 OPT_BOOL('l', "list", &list,
 629                         N_("list supported archive formats")),
 630                 OPT_GROUP(""),
 631                 OPT_STRING(0, "remote", &remote, N_("repo"),
 632                         N_("retrieve the archive from remote repository <repo>")),
 633                 OPT_STRING(0, "exec", &exec, N_("command"),
 634                         N_("path to the remote git-upload-archive command")),
 635                 OPT_END()
 636         };
 637
 638         argc = parse_options(argc, argv, NULL, opts, archive_usage, 0);
 639
 640         if (remote)
 641                 die(_("Unexpected option --remote"));
 642         if (exec)
 643                 die(_("the option '%s' requires '%s'"), "--exec", "--remote");
 644         if (output)
 645                 die(_("Unexpected option --output"));
 646         if (is_remote && args->extra_files.nr)
 647                 die(_("options '%s' and '%s' cannot be used together"), "--add-file", "--remote");
 648
 649         if (!base)
 650                 base = "";
 651
 652         if (list) {
 653                 for (i = 0; i < nr_archivers; i++)
 654                         if (!is_remote || archivers[i]->flags & ARCHIVER_REMOTE)
 655                                 printf("%s\n", archivers[i]->name);
 656                 exit(0);
 657         }
 658
 659         if (!format && name_hint)
 660                 format = archive_format_from_filename(name_hint);
 661         if (!format)
 662                 format = "tar";
 663
 664         /* We need at least one parameter -- tree-ish */
 665         if (argc < 1)
 666                 usage_with_options(archive_usage, opts);
 667         *ar = lookup_archiver(format);
 668         if (!*ar || (is_remote && !((*ar)->flags & ARCHIVER_REMOTE)))
 669                 die(_("Unknown archive format '%s'"), format);
 670
 671         args->compression_level = Z_DEFAULT_COMPRESSION;
 672         if (compression_level != -1) {
 673                 int levels_ok = (*ar)->flags & ARCHIVER_WANT_COMPRESSION_LEVELS;
 674                 int high_ok = (*ar)->flags & ARCHIVER_HIGH_COMPRESSION_LEVELS;
 675                 if (levels_ok && (compression_level <= 9 || high_ok))
 676                         args->compression_level = compression_level;
 677                 else {
 678                         die(_("Argument not supported for format '%s': -%d"),
 679                                         format, compression_level);
 680                 }
 681         }
 682         args->verbose = verbose;
 683         args->base = base;
 684         args->baselen = strlen(base);
 685         args->worktree_attributes = worktree_attributes;
 686         args->mtime_option = mtime_option;
 687
 688         return argc;
 689 }
 690
 691 int write_archive(int argc, const char **argv, const char *prefix,
 692                   struct repository *repo,
 693                   const char *name_hint, int remote)
 694 {
 695         const struct archiver *ar = NULL;
 696         struct pretty_print_describe_status describe_status = {0};
 697         struct pretty_print_context ctx = {0};
 698         struct archiver_args args;
 699         int rc;
 700
 701         git_config_get_bool("uploadarchive.allowunreachable", &remote_allow_unreachable);
 702         git_config(git_default_config, NULL);
 703
 704         describe_status.max_invocations = 1;
 705         ctx.date_mode.type = DATE_NORMAL;
 706         ctx.abbrev = DEFAULT_ABBREV;
 707         ctx.describe_status = &describe_status;
 708         args.pretty_ctx = &ctx;
 709         args.repo = repo;
 710         args.prefix = prefix;
 711         string_list_init_dup(&args.extra_files);
 712         argc = parse_archive_args(argc, argv, &ar, &args, name_hint, remote);
 713         if (!startup_info->have_repository) {
 714                 /*
 715                  * We know this will die() with an error, so we could just
 716                  * die ourselves; but its error message will be more specific
 717                  * than what we could write here.
 718                  */
 719                 setup_git_directory();
 720         }
 721
 722         parse_treeish_arg(argv, &args, prefix, remote);
 723         parse_pathspec_arg(argv + 1, &args);
 724
 725         rc = ar->write_archive(ar, &args);
 726
 727         string_list_clear_func(&args.extra_files, extra_file_info_clear);
 728         free(args.refname);
 729         clear_pathspec(&args.pathspec);
 730
 731         return rc;
 732 }
 733
 734 static int match_extension(const char *filename, const char *ext)
 735 {
 736         int prefixlen = strlen(filename) - strlen(ext);
 737
 738         /*
 739          * We need 1 character for the '.', and 1 character to ensure that the
 740          * prefix is non-empty (k.e., we don't match .tar.gz with no actual
 741          * filename).
 742          */
 743         if (prefixlen < 2 || filename[prefixlen - 1] != '.')
 744                 return 0;
 745         return !strcmp(filename + prefixlen, ext);
 746 }
 747
 748 const char *archive_format_from_filename(const char *filename)
 749 {
 750         int i;
 751
 752         for (i = 0; i < nr_archivers; i++)
 753                 if (match_extension(filename, archivers[i]->name))
 754                         return archivers[i]->name;
 755         return NULL;
 756 }