archive.c

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