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 "path.h"
  10 #include "pretty.h"
  11 #include "setup.h"
  12 #include "refs.h"
  13 #include "object-store-ll.h"
  14 #include "commit.h"
  15 #include "tree.h"
  16 #include "tree-walk.h"
  17 #include "attr.h"
  18 #include "archive.h"
  19 #include "parse-options.h"
  20 #include "unpack-trees.h"
  21 #include "dir.h"
  22 #include "quote.h"
  23
  24 static char const * const archive_usage[] = {
  25         N_("git archive [<options>] <tree-ish> [<path>...]"),
  26         "git archive --list",
  27         N_("git archive --remote <repo> [--exec <cmd>] [<options>] <tree-ish> [<path>...]"),
  28         N_("git archive --remote <repo> [--exec <cmd>] --list"),
  29         NULL
  30 };
  31
  32 static const struct archiver **archivers;
  33 static int nr_archivers;
  34 static int alloc_archivers;
  35 static int remote_allow_unreachable;
  36
  37 void register_archiver(struct archiver *ar)
  38 {
  39         ALLOC_GROW(archivers, nr_archivers + 1, alloc_archivers);
  40         archivers[nr_archivers++] = ar;
  41 }
  42
  43 void init_archivers(void)
  44 {
  45         init_tar_archiver();
  46         init_zip_archiver();
  47 }
  48
  49 static void format_subst(const struct commit *commit,
  50                          const char *src, size_t len,
  51                          struct strbuf *buf, struct pretty_print_context *ctx)
  52 {
  53         char *to_free = NULL;
  54         struct strbuf fmt = STRBUF_INIT;
  55
  56         if (src == buf->buf)
  57                 to_free = strbuf_detach(buf, NULL);
  58         for (;;) {
  59                 const char *b, *c;
  60
  61                 b = memmem(src, len, "$Format:", 8);
  62                 if (!b)
  63                         break;
  64                 c = memchr(b + 8, '$', (src + len) - b - 8);
  65                 if (!c)
  66                         break;
  67
  68                 strbuf_reset(&fmt);
  69                 strbuf_add(&fmt, b + 8, c - b - 8);
  70
  71                 strbuf_add(buf, src, b - src);
  72                 repo_format_commit_message(the_repository, commit, fmt.buf,
  73                                            buf, ctx);
  74                 len -= c + 1 - src;
  75                 src  = c + 1;
  76         }
  77         strbuf_add(buf, src, len);
  78         strbuf_release(&fmt);
  79         free(to_free);
  80 }
  81
  82 static void *object_file_to_archive(const struct archiver_args *args,
  83                                     const char *path,
  84                                     const struct object_id *oid,
  85                                     unsigned int mode,
  86                                     enum object_type *type,
  87                                     unsigned long *sizep)
  88 {
  89         void *buffer;
  90         const struct commit *commit = args->convert ? args->commit : NULL;
  91         struct checkout_metadata meta;
  92
  93         init_checkout_metadata(&meta, args->refname,
  94                                args->commit_oid ? args->commit_oid :
  95                                (args->tree ? &args->tree->object.oid : NULL), oid);
  96
  97         path += args->baselen;
  98         buffer = repo_read_object_file(the_repository, oid, type, sizep);
  99         if (buffer && S_ISREG(mode)) {
 100                 struct strbuf buf = STRBUF_INIT;
 101                 size_t size = 0;
 102
 103                 strbuf_attach(&buf, buffer, *sizep, *sizep + 1);
 104                 convert_to_working_tree(args->repo->index, path, buf.buf, buf.len, &buf, &meta);
 105                 if (commit)
 106                         format_subst(commit, buf.buf, buf.len, &buf, args->pretty_ctx);
 107                 buffer = strbuf_detach(&buf, &size);
 108                 *sizep = size;
 109         }
 110
 111         return buffer;
 112 }
 113
 114 struct directory {
 115         struct directory *up;
 116         struct object_id oid;
 117         int baselen, len;
 118         unsigned mode;
 119         char path[FLEX_ARRAY];
 120 };
 121
 122 struct archiver_context {
 123         struct archiver_args *args;
 124         write_archive_entry_fn_t write_entry;
 125         struct directory *bottom;
 126 };
 127
 128 static const struct attr_check *get_archive_attrs(struct index_state *istate,
 129                                                   const char *path)
 130 {
 131         static struct attr_check *check;
 132         if (!check)
 133                 check = attr_check_initl("export-ignore", "export-subst", NULL);
 134         git_check_attr(istate, path, check);
 135         return check;
 136 }
 137
 138 static int check_attr_export_ignore(const struct attr_check *check)
 139 {
 140         return check && ATTR_TRUE(check->items[0].value);
 141 }
 142
 143 static int check_attr_export_subst(const struct attr_check *check)
 144 {
 145         return check && ATTR_TRUE(check->items[1].value);
 146 }
 147
 148 static int write_archive_entry(const struct object_id *oid, const char *base,
 149                 int baselen, const char *filename, unsigned mode,
 150                 void *context)
 151 {
 152         static struct strbuf path = STRBUF_INIT;
 153         struct archiver_context *c = context;
 154         struct archiver_args *args = c->args;
 155         write_archive_entry_fn_t write_entry = c->write_entry;
 156         int err;
 157         const char *path_without_prefix;
 158         unsigned long size;
 159         void *buffer;
 160         enum object_type type;
 161
 162         args->convert = 0;
 163         strbuf_reset(&path);
 164         strbuf_grow(&path, PATH_MAX);
 165         strbuf_add(&path, args->base, args->baselen);
 166         strbuf_add(&path, base, baselen);
 167         strbuf_addstr(&path, filename);
 168         if (S_ISDIR(mode) || S_ISGITLINK(mode))
 169                 strbuf_addch(&path, '/');
 170         path_without_prefix = path.buf + args->baselen;
 171
 172         if (!S_ISDIR(mode)) {
 173                 const struct attr_check *check;
 174                 check = get_archive_attrs(args->repo->index, path_without_prefix);
 175                 if (check_attr_export_ignore(check))
 176                         return 0;
 177                 args->convert = check_attr_export_subst(check);
 178         }
 179
 180         if (args->prefix) {
 181                 static struct strbuf new_path = STRBUF_INIT;
 182                 static struct strbuf buf = STRBUF_INIT;
 183                 const char *rel;
 184
 185                 rel = relative_path(path_without_prefix, args->prefix, &buf);
 186
 187                 /*
 188                  * We don't add an entry for the current working
 189                  * directory when we are at the root; skip it also when
 190                  * we're in a subdirectory or submodule.  Skip entries
 191                  * higher up as well.
 192                  */
 193                 if (!strcmp(rel, "./") || starts_with(rel, "../"))
 194                         return S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0;
 195
 196                 /* rel can refer to path, so don't edit it in place */
 197                 strbuf_reset(&new_path);
 198                 strbuf_add(&new_path, args->base, args->baselen);
 199                 strbuf_addstr(&new_path, rel);
 200                 strbuf_swap(&path, &new_path);
 201         }
 202
 203         if (args->verbose)
 204                 fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
 205
 206         if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
 207                 err = write_entry(args, oid, path.buf, path.len, mode, NULL, 0);
 208                 if (err)
 209                         return err;
 210                 return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0);
 211         }
 212
 213         /* Stream it? */
 214         if (S_ISREG(mode) && !args->convert &&
 215             oid_object_info(args->repo, oid, &size) == OBJ_BLOB &&
 216             size > big_file_threshold)
 217                 return write_entry(args, oid, path.buf, path.len, mode, NULL, size);
 218
 219         buffer = object_file_to_archive(args, path.buf, oid, mode, &type, &size);
 220         if (!buffer)
 221                 return error(_("cannot read '%s'"), oid_to_hex(oid));
 222         err = write_entry(args, oid, path.buf, path.len, mode, buffer, size);
 223         free(buffer);
 224         return err;
 225 }
 226
 227 static void queue_directory(const struct object_id *oid,
 228                 struct strbuf *base, const char *filename,
 229                 unsigned mode, struct archiver_context *c)
 230 {
 231         struct directory *d;
 232         size_t len = st_add4(base->len, 1, strlen(filename), 1);
 233         d = xmalloc(st_add(sizeof(*d), len));
 234         d->up      = c->bottom;
 235         d->baselen = base->len;
 236         d->mode    = mode;
 237         c->bottom  = d;
 238         d->len = xsnprintf(d->path, len, "%.*s%s/", (int)base->len, base->buf, filename);
 239         oidcpy(&d->oid, oid);
 240 }
 241
 242 static int write_directory(struct archiver_context *c)
 243 {
 244         struct directory *d = c->bottom;
 245         int ret;
 246
 247         if (!d)
 248                 return 0;
 249         c->bottom = d->up;
 250         d->path[d->len - 1] = '\0'; /* no trailing slash */
 251         ret =
 252                 write_directory(c) ||
 253                 write_archive_entry(&d->oid, d->path, d->baselen,
 254                                     d->path + d->baselen, d->mode,
 255                                     c) != READ_TREE_RECURSIVE;
 256         free(d);
 257         return ret ? -1 : 0;
 258 }
 259
 260 static int queue_or_write_archive_entry(const struct object_id *oid,
 261                 struct strbuf *base, const char *filename,
 262                 unsigned mode, void *context)
 263 {
 264         struct archiver_context *c = context;
 265
 266         while (c->bottom &&
 267                !(base->len >= c->bottom->len &&
 268                  !strncmp(base->buf, c->bottom->path, c->bottom->len))) {
 269                 struct directory *next = c->bottom->up;
 270                 free(c->bottom);
 271                 c->bottom = next;
 272         }
 273
 274         if (S_ISDIR(mode)) {
 275                 size_t baselen = base->len;
 276                 const struct attr_check *check;
 277
 278                 /* Borrow base, but restore its original value when done. */
 279                 strbuf_addstr(base, filename);
 280                 strbuf_addch(base, '/');
 281                 check = get_archive_attrs(c->args->repo->index, base->buf);
 282                 strbuf_setlen(base, baselen);
 283
 284                 if (check_attr_export_ignore(check))
 285                         return 0;
 286                 queue_directory(oid, base, filename, mode, c);
 287                 return READ_TREE_RECURSIVE;
 288         }
 289
 290         if (write_directory(c))
 291                 return -1;
 292         return write_archive_entry(oid, base->buf, base->len, filename, mode,
 293                                    context);
 294 }
 295
 296 struct extra_file_info {
 297         char *base;
 298         struct stat stat;
 299         void *content;
 300 };
 301
 302 int write_archive_entries(struct archiver_args *args,
 303                 write_archive_entry_fn_t write_entry)
 304 {
 305         struct archiver_context context;
 306         struct unpack_trees_options opts;
 307         struct tree_desc t;
 308         int err;
 309         struct strbuf path_in_archive = STRBUF_INIT;
 310         struct strbuf content = STRBUF_INIT;
 311         struct object_id fake_oid;
 312         int i;
 313
 314         oidcpy(&fake_oid, null_oid());
 315
 316         if (args->baselen > 0 && args->base[args->baselen - 1] == '/') {
 317                 size_t len = args->baselen;
 318
 319                 while (len > 1 && args->base[len - 2] == '/')
 320                         len--;
 321                 if (args->verbose)
 322                         fprintf(stderr, "%.*s\n", (int)len, args->base);
 323                 err = write_entry(args, &args->tree->object.oid, args->base,
 324                                   len, 040777, NULL, 0);
 325                 if (err)
 326                         return err;
 327         }
 328
 329         memset(&context, 0, sizeof(context));
 330         context.args = args;
 331         context.write_entry = write_entry;
 332
 333         /*
 334          * Setup index and instruct attr to read index only
 335          */
 336         if (!args->worktree_attributes) {
 337                 memset(&opts, 0, sizeof(opts));
 338                 opts.index_only = 1;
 339                 opts.head_idx = -1;
 340                 opts.src_index = args->repo->index;
 341                 opts.dst_index = args->repo->index;
 342                 opts.fn = oneway_merge;
 343                 init_tree_desc(&t, args->tree->buffer, args->tree->size);
 344                 if (unpack_trees(1, &t, &opts))
 345                         return -1;
 346                 git_attr_set_direction(GIT_ATTR_INDEX);
 347         }
 348
 349         err = read_tree(args->repo, args->tree,
 350                         &args->pathspec,
 351                         queue_or_write_archive_entry,
 352                         &context);
 353         if (err == READ_TREE_RECURSIVE)
 354                 err = 0;
 355         while (context.bottom) {
 356                 struct directory *next = context.bottom->up;
 357                 free(context.bottom);
 358                 context.bottom = next;
 359         }
 360
 361         for (i = 0; i < args->extra_files.nr; i++) {
 362                 struct string_list_item *item = args->extra_files.items + i;
 363                 char *path = item->string;
 364                 struct extra_file_info *info = item->util;
 365
 366                 put_be64(fake_oid.hash, i + 1);
 367
 368                 if (!info->content) {
 369                         strbuf_reset(&path_in_archive);
 370                         if (info->base)
 371                                 strbuf_addstr(&path_in_archive, info->base);
 372                         strbuf_addstr(&path_in_archive, basename(path));
 373
 374                         strbuf_reset(&content);
 375                         if (strbuf_read_file(&content, path, info->stat.st_size) < 0)
 376                                 err = error_errno(_("cannot read '%s'"), path);
 377                         else
 378                                 err = write_entry(args, &fake_oid, path_in_archive.buf,
 379                                                   path_in_archive.len,
 380                                                   canon_mode(info->stat.st_mode),
 381                                                   content.buf, content.len);
 382                 } else {
 383                         err = write_entry(args, &fake_oid,
 384                                           path, strlen(path),
 385                                           canon_mode(info->stat.st_mode),
 386                                           info->content, info->stat.st_size);
 387                 }
 388
 389                 if (err)
 390                         break;
 391         }
 392         strbuf_release(&path_in_archive);
 393         strbuf_release(&content);
 394
 395         return err;
 396 }
 397
 398 static const struct archiver *lookup_archiver(const char *name)
 399 {
 400         int i;
 401
 402         if (!name)
 403                 return NULL;
 404
 405         for (i = 0; i < nr_archivers; i++) {
 406                 if (!strcmp(name, archivers[i]->name))
 407                         return archivers[i];
 408         }
 409         return NULL;
 410 }
 411
 412 struct path_exists_context {
 413         struct pathspec pathspec;
 414         struct archiver_args *args;
 415 };
 416
 417 static int reject_entry(const struct object_id *oid UNUSED,
 418                         struct strbuf *base,
 419                         const char *filename, unsigned mode,
 420                         void *context)
 421 {
 422         int ret = -1;
 423         struct path_exists_context *ctx = context;
 424
 425         if (S_ISDIR(mode)) {
 426                 struct strbuf sb = STRBUF_INIT;
 427                 strbuf_addbuf(&sb, base);
 428                 strbuf_addstr(&sb, filename);
 429                 if (!match_pathspec(ctx->args->repo->index,
 430                                     &ctx->pathspec,
 431                                     sb.buf, sb.len, 0, NULL, 1))
 432                         ret = READ_TREE_RECURSIVE;
 433                 strbuf_release(&sb);
 434         }
 435         return ret;
 436 }
 437
 438 static int reject_outside(const struct object_id *oid UNUSED,
 439                           struct strbuf *base, const char *filename,
 440                           unsigned mode, void *context)
 441 {
 442         struct archiver_args *args = context;
 443         struct strbuf buf = STRBUF_INIT;
 444         struct strbuf path = STRBUF_INIT;
 445         int ret = 0;
 446
 447         if (S_ISDIR(mode))
 448                 return READ_TREE_RECURSIVE;
 449
 450         strbuf_addbuf(&path, base);
 451         strbuf_addstr(&path, filename);
 452         if (starts_with(relative_path(path.buf, args->prefix, &buf), "../"))
 453                 ret = -1;
 454         strbuf_release(&buf);
 455         strbuf_release(&path);
 456         return ret;
 457 }
 458
 459 static int path_exists(struct archiver_args *args, const char *path)
 460 {
 461         const char *paths[] = { path, NULL };
 462         struct path_exists_context ctx;
 463         int ret;
 464
 465         ctx.args = args;
 466         parse_pathspec(&ctx.pathspec, 0, PATHSPEC_PREFER_CWD,
 467                        args->prefix, paths);
 468         ctx.pathspec.recursive = 1;
 469         if (args->prefix && read_tree(args->repo, args->tree, &ctx.pathspec,
 470                                       reject_outside, args))
 471                 die(_("pathspec '%s' matches files outside the "
 472                       "current directory"), path);
 473         ret = read_tree(args->repo, args->tree,
 474                         &ctx.pathspec,
 475                         reject_entry, &ctx);
 476         clear_pathspec(&ctx.pathspec);
 477         return ret != 0;
 478 }
 479
 480 static void parse_pathspec_arg(const char **pathspec,
 481                 struct archiver_args *ar_args)
 482 {
 483         /*
 484          * must be consistent with parse_pathspec in path_exists()
 485          * Also if pathspec patterns are dependent, we're in big
 486          * trouble as we test each one separately
 487          */
 488         parse_pathspec(&ar_args->pathspec, 0, PATHSPEC_PREFER_CWD,
 489                        ar_args->prefix, pathspec);
 490         ar_args->pathspec.recursive = 1;
 491         if (pathspec) {
 492                 while (*pathspec) {
 493                         if (**pathspec && !path_exists(ar_args, *pathspec))
 494                                 die(_("pathspec '%s' did not match any files"), *pathspec);
 495                         pathspec++;
 496                 }
 497         }
 498 }
 499
 500 static void parse_treeish_arg(const char **argv,
 501                               struct archiver_args *ar_args, int remote)
 502 {
 503         const char *name = argv[0];
 504         const struct object_id *commit_oid;
 505         time_t archive_time;
 506         struct tree *tree;
 507         const struct commit *commit;
 508         struct object_id oid;
 509         char *ref = NULL;
 510
 511         /* Remotes are only allowed to fetch actual refs */
 512         if (remote && !remote_allow_unreachable) {
 513                 const char *colon = strchrnul(name, ':');
 514                 int refnamelen = colon - name;
 515
 516                 if (!repo_dwim_ref(the_repository, name, refnamelen, &oid, &ref, 0))
 517                         die(_("no such ref: %.*s"), refnamelen, name);
 518         } else {
 519                 repo_dwim_ref(the_repository, name, strlen(name), &oid, &ref,
 520                               0);
 521         }
 522
 523         if (repo_get_oid(the_repository, name, &oid))
 524                 die(_("not a valid object name: %s"), name);
 525
 526         commit = lookup_commit_reference_gently(ar_args->repo, &oid, 1);
 527         if (commit) {
 528                 commit_oid = &commit->object.oid;
 529                 archive_time = commit->date;
 530         } else {
 531                 commit_oid = NULL;
 532                 archive_time = time(NULL);
 533         }
 534         if (ar_args->mtime_option)
 535                 archive_time = approxidate(ar_args->mtime_option);
 536
 537         tree = parse_tree_indirect(&oid);
 538         if (!tree)
 539                 die(_("not a tree object: %s"), oid_to_hex(&oid));
 540
 541         ar_args->refname = ref;
 542         ar_args->tree = tree;
 543         ar_args->commit_oid = commit_oid;
 544         ar_args->commit = commit;
 545         ar_args->time = archive_time;
 546 }
 547
 548 static void extra_file_info_clear(void *util, const char *str UNUSED)
 549 {
 550         struct extra_file_info *info = util;
 551         free(info->base);
 552         free(info->content);
 553         free(info);
 554 }
 555
 556 static int add_file_cb(const struct option *opt, const char *arg, int unset)
 557 {
 558         struct archiver_args *args = opt->value;
 559         const char **basep = (const char **)opt->defval;
 560         const char *base = *basep;
 561         char *path;
 562         struct string_list_item *item;
 563         struct extra_file_info *info;
 564
 565         if (unset) {
 566                 string_list_clear_func(&args->extra_files,
 567                                        extra_file_info_clear);
 568                 return 0;
 569         }
 570
 571         if (!arg)
 572                 return -1;
 573
 574         info = xmalloc(sizeof(*info));
 575         info->base = xstrdup_or_null(base);
 576
 577         if (!strcmp(opt->long_name, "add-file")) {
 578                 path = prefix_filename(args->prefix, arg);
 579                 if (stat(path, &info->stat))
 580                         die(_("File not found: %s"), path);
 581                 if (!S_ISREG(info->stat.st_mode))
 582                         die(_("Not a regular file: %s"), path);
 583                 info->content = NULL; /* read the file later */
 584         } else if (!strcmp(opt->long_name, "add-virtual-file")) {
 585                 struct strbuf buf = STRBUF_INIT;
 586                 const char *p = arg;
 587
 588                 if (*p != '"')
 589                         p = strchr(p, ':');
 590                 else if (unquote_c_style(&buf, p, &p) < 0)
 591                         die(_("unclosed quote: '%s'"), arg);
 592
 593                 if (!p || *p != ':')
 594                         die(_("missing colon: '%s'"), arg);
 595
 596                 if (p == arg)
 597                         die(_("empty file name: '%s'"), arg);
 598
 599                 path = buf.len ?
 600                         strbuf_detach(&buf, NULL) : xstrndup(arg, p - arg);
 601
 602                 if (args->prefix) {
 603                         char *save = path;
 604                         path = prefix_filename(args->prefix, path);
 605                         free(save);
 606                 }
 607                 memset(&info->stat, 0, sizeof(info->stat));
 608                 info->stat.st_mode = S_IFREG | 0644;
 609                 info->content = xstrdup(p + 1);
 610                 info->stat.st_size = strlen(info->content);
 611         } else {
 612                 BUG("add_file_cb() called for %s", opt->long_name);
 613         }
 614         item = string_list_append_nodup(&args->extra_files, path);
 615         item->util = info;
 616
 617         return 0;
 618 }
 619
 620 static int number_callback(const struct option *opt, const char *arg, int unset)
 621 {
 622         BUG_ON_OPT_NEG(unset);
 623         *(int *)opt->value = strtol(arg, NULL, 10);
 624         return 0;
 625 }
 626
 627 static int parse_archive_args(int argc, const char **argv,
 628                 const struct archiver **ar, struct archiver_args *args,
 629                 const char *name_hint, int is_remote)
 630 {
 631         const char *format = NULL;
 632         const char *base = NULL;
 633         const char *remote = NULL;
 634         const char *exec = NULL;
 635         const char *output = NULL;
 636         const char *mtime_option = NULL;
 637         int compression_level = -1;
 638         int verbose = 0;
 639         int i;
 640         int list = 0;
 641         int worktree_attributes = 0;
 642         struct option opts[] = {
 643                 OPT_GROUP(""),
 644                 OPT_STRING(0, "format", &format, N_("fmt"), N_("archive format")),
 645                 OPT_STRING(0, "prefix", &base, N_("prefix"),
 646                         N_("prepend prefix to each pathname in the archive")),
 647                 { OPTION_CALLBACK, 0, "add-file", args, N_("file"),
 648                   N_("add untracked file to archive"), 0, add_file_cb,
 649                   (intptr_t)&base },
 650                 { OPTION_CALLBACK, 0, "add-virtual-file", args,
 651                   N_("path:content"), N_("add untracked file to archive"), 0,
 652                   add_file_cb, (intptr_t)&base },
 653                 OPT_STRING('o', "output", &output, N_("file"),
 654                         N_("write the archive to this file")),
 655                 OPT_BOOL(0, "worktree-attributes", &worktree_attributes,
 656                         N_("read .gitattributes in working directory")),
 657                 OPT__VERBOSE(&verbose, N_("report archived files on stderr")),
 658                 { OPTION_STRING, 0, "mtime", &mtime_option, N_("time"),
 659                   N_("set modification time of archive entries"),
 660                   PARSE_OPT_NONEG },
 661                 OPT_NUMBER_CALLBACK(&compression_level,
 662                         N_("set compression level"), number_callback),
 663                 OPT_GROUP(""),
 664                 OPT_BOOL('l', "list", &list,
 665                         N_("list supported archive formats")),
 666                 OPT_GROUP(""),
 667                 OPT_STRING(0, "remote", &remote, N_("repo"),
 668                         N_("retrieve the archive from remote repository <repo>")),
 669                 OPT_STRING(0, "exec", &exec, N_("command"),
 670                         N_("path to the remote git-upload-archive command")),
 671                 OPT_END()
 672         };
 673
 674         argc = parse_options(argc, argv, NULL, opts, archive_usage, 0);
 675
 676         if (remote)
 677                 die(_("Unexpected option --remote"));
 678         if (exec)
 679                 die(_("the option '%s' requires '%s'"), "--exec", "--remote");
 680         if (output)
 681                 die(_("Unexpected option --output"));
 682         if (is_remote && args->extra_files.nr)
 683                 die(_("options '%s' and '%s' cannot be used together"), "--add-file", "--remote");
 684
 685         if (!base)
 686                 base = "";
 687
 688         if (list) {
 689                 for (i = 0; i < nr_archivers; i++)
 690                         if (!is_remote || archivers[i]->flags & ARCHIVER_REMOTE)
 691                                 printf("%s\n", archivers[i]->name);
 692                 exit(0);
 693         }
 694
 695         if (!format && name_hint)
 696                 format = archive_format_from_filename(name_hint);
 697         if (!format)
 698                 format = "tar";
 699
 700         /* We need at least one parameter -- tree-ish */
 701         if (argc < 1)
 702                 usage_with_options(archive_usage, opts);
 703         *ar = lookup_archiver(format);
 704         if (!*ar || (is_remote && !((*ar)->flags & ARCHIVER_REMOTE)))
 705                 die(_("Unknown archive format '%s'"), format);
 706
 707         args->compression_level = Z_DEFAULT_COMPRESSION;
 708         if (compression_level != -1) {
 709                 int levels_ok = (*ar)->flags & ARCHIVER_WANT_COMPRESSION_LEVELS;
 710                 int high_ok = (*ar)->flags & ARCHIVER_HIGH_COMPRESSION_LEVELS;
 711                 if (levels_ok && (compression_level <= 9 || high_ok))
 712                         args->compression_level = compression_level;
 713                 else {
 714                         die(_("Argument not supported for format '%s': -%d"),
 715                                         format, compression_level);
 716                 }
 717         }
 718         args->verbose = verbose;
 719         args->base = base;
 720         args->baselen = strlen(base);
 721         args->worktree_attributes = worktree_attributes;
 722         args->mtime_option = mtime_option;
 723
 724         return argc;
 725 }
 726
 727 int write_archive(int argc, const char **argv, const char *prefix,
 728                   struct repository *repo,
 729                   const char *name_hint, int remote)
 730 {
 731         const struct archiver *ar = NULL;
 732         struct pretty_print_describe_status describe_status = {0};
 733         struct pretty_print_context ctx = {0};
 734         struct archiver_args args;
 735         int rc;
 736
 737         git_config_get_bool("uploadarchive.allowunreachable", &remote_allow_unreachable);
 738         git_config(git_default_config, NULL);
 739
 740         describe_status.max_invocations = 1;
 741         ctx.date_mode.type = DATE_NORMAL;
 742         ctx.abbrev = DEFAULT_ABBREV;
 743         ctx.describe_status = &describe_status;
 744         args.pretty_ctx = &ctx;
 745         args.repo = repo;
 746         args.prefix = prefix;
 747         string_list_init_dup(&args.extra_files);
 748         argc = parse_archive_args(argc, argv, &ar, &args, name_hint, remote);
 749         if (!startup_info->have_repository) {
 750                 /*
 751                  * We know this will die() with an error, so we could just
 752                  * die ourselves; but its error message will be more specific
 753                  * than what we could write here.
 754                  */
 755                 setup_git_directory();
 756         }
 757
 758         parse_treeish_arg(argv, &args, remote);
 759         parse_pathspec_arg(argv + 1, &args);
 760
 761         rc = ar->write_archive(ar, &args);
 762
 763         string_list_clear_func(&args.extra_files, extra_file_info_clear);
 764         free(args.refname);
 765         clear_pathspec(&args.pathspec);
 766
 767         return rc;
 768 }
 769
 770 static int match_extension(const char *filename, const char *ext)
 771 {
 772         int prefixlen = strlen(filename) - strlen(ext);
 773
 774         /*
 775          * We need 1 character for the '.', and 1 character to ensure that the
 776          * prefix is non-empty (k.e., we don't match .tar.gz with no actual
 777          * filename).
 778          */
 779         if (prefixlen < 2 || filename[prefixlen - 1] != '.')
 780                 return 0;
 781         return !strcmp(filename + prefixlen, ext);
 782 }
 783
 784 const char *archive_format_from_filename(const char *filename)
 785 {
 786         int i;
 787
 788         for (i = 0; i < nr_archivers; i++)
 789                 if (match_extension(filename, archivers[i]->name))
 790                         return archivers[i]->name;
 791         return NULL;
 792 }