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