archive.c

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