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