archive.c

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