archive.c

   1 #define USE_THE_REPOSITORY_VARIABLE
   2
   3 #include "git-compat-util.h"
   4 #include "abspath.h"
   5 #include "config.h"
   6 #include "convert.h"
   7 #include "environment.h"
   8 #include "gettext.h"
   9 #include "hex.h"
  10 #include "object-name.h"
  11 #include "path.h"
  12 #include "pretty.h"
  13 #include "setup.h"
  14 #include "refs.h"
  15 #include "object-store-ll.h"
  16 #include "commit.h"
  17 #include "tree.h"
  18 #include "tree-walk.h"
  19 #include "attr.h"
  20 #include "archive.h"
  21 #include "parse-options.h"
  22 #include "unpack-trees.h"
  23 #include "quote.h"
  24
  25 static char const * const archive_usage[] = {
  26         N_("git archive [<options>] <tree-ish> [<path>...]"),
  27         "git archive --list",
  28         N_("git archive --remote <repo> [--exec <cmd>] [<options>] <tree-ish> [<path>...]"),
  29         N_("git archive --remote <repo> [--exec <cmd>] --list"),
  30         NULL
  31 };
  32
  33 static const struct archiver **archivers;
  34 static int nr_archivers;
  35 static int alloc_archivers;
  36 static int remote_allow_unreachable;
  37
  38 void register_archiver(struct archiver *ar)
  39 {
  40         ALLOC_GROW(archivers, nr_archivers + 1, alloc_archivers);
  41         archivers[nr_archivers++] = ar;
  42 }
  43
  44 void init_archivers(void)
  45 {
  46         init_tar_archiver();
  47         init_zip_archiver();
  48 }
  49
  50 static void format_subst(const struct commit *commit,
  51                          const char *src, size_t len,
  52                          struct strbuf *buf, struct pretty_print_context *ctx)
  53 {
  54         char *to_free = NULL;
  55         struct strbuf fmt = STRBUF_INIT;
  56
  57         if (src == buf->buf)
  58                 to_free = strbuf_detach(buf, NULL);
  59         for (;;) {
  60                 const char *b, *c;
  61
  62                 b = memmem(src, len, "$Format:", 8);
  63                 if (!b)
  64                         break;
  65                 c = memchr(b + 8, '$', (src + len) - b - 8);
  66                 if (!c)
  67                         break;
  68
  69                 strbuf_reset(&fmt);
  70                 strbuf_add(&fmt, b + 8, c - b - 8);
  71
  72                 strbuf_add(buf, src, b - src);
  73                 repo_format_commit_message(the_repository, commit, fmt.buf,
  74                                            buf, ctx);
  75                 len -= c + 1 - src;
  76                 src  = c + 1;
  77         }
  78         strbuf_add(buf, src, len);
  79         strbuf_release(&fmt);
  80         free(to_free);
  81 }
  82
  83 static void *object_file_to_archive(const struct archiver_args *args,
  84                                     const char *path,
  85                                     const struct object_id *oid,
  86                                     unsigned int mode,
  87                                     enum object_type *type,
  88                                     unsigned long *sizep)
  89 {
  90         void *buffer;
  91         const struct commit *commit = args->convert ? args->commit : NULL;
  92         struct checkout_metadata meta;
  93
  94         init_checkout_metadata(&meta, args->refname,
  95                                args->commit_oid ? args->commit_oid :
  96                                (args->tree ? &args->tree->object.oid : NULL), oid);
  97
  98         path += args->baselen;
  99         buffer = repo_read_object_file(the_repository, oid, type, sizep);
 100         if (buffer && S_ISREG(mode)) {
 101                 struct strbuf buf = STRBUF_INIT;
 102                 size_t size = 0;
 103
 104                 strbuf_attach(&buf, buffer, *sizep, *sizep + 1);
 105                 convert_to_working_tree(args->repo->index, path, buf.buf, buf.len, &buf, &meta);
 106                 if (commit)
 107                         format_subst(commit, buf.buf, buf.len, &buf, args->pretty_ctx);
 108                 buffer = strbuf_detach(&buf, &size);
 109                 *sizep = size;
 110         }
 111
 112         return buffer;
 113 }
 114
 115 struct directory {
 116         struct directory *up;
 117         struct object_id oid;
 118         int baselen, len;
 119         unsigned mode;
 120         char path[FLEX_ARRAY];
 121 };
 122
 123 struct archiver_context {
 124         struct archiver_args *args;
 125         write_archive_entry_fn_t write_entry;
 126         struct directory *bottom;
 127 };
 128
 129 static const struct attr_check *get_archive_attrs(struct index_state *istate,
 130                                                   const char *path)
 131 {
 132         static struct attr_check *check;
 133         if (!check)
 134                 check = attr_check_initl("export-ignore", "export-subst", NULL);
 135         git_check_attr(istate, path, check);
 136         return check;
 137 }
 138
 139 static int check_attr_export_ignore(const struct attr_check *check)
 140 {
 141         return check && ATTR_TRUE(check->items[0].value);
 142 }
 143
 144 static int check_attr_export_subst(const struct attr_check *check)
 145 {
 146         return check && ATTR_TRUE(check->items[1].value);
 147 }
 148
 149 static int write_archive_entry(const struct object_id *oid, const char *base,
 150                 int baselen, const char *filename, unsigned mode,
 151                 void *context)
 152 {
 153         static struct strbuf path = STRBUF_INIT;
 154         struct archiver_context *c = context;
 155         struct archiver_args *args = c->args;
 156         write_archive_entry_fn_t write_entry = c->write_entry;
 157         int err;
 158         const char *path_without_prefix;
 159         unsigned long size;
 160         void *buffer;
 161         enum object_type type;
 162
 163         args->convert = 0;
 164         strbuf_reset(&path);
 165         strbuf_grow(&path, PATH_MAX);
 166         strbuf_add(&path, args->base, args->baselen);
 167         strbuf_add(&path, base, baselen);
 168         strbuf_addstr(&path, filename);
 169         if (S_ISDIR(mode) || S_ISGITLINK(mode))
 170                 strbuf_addch(&path, '/');
 171         path_without_prefix = path.buf + args->baselen;
 172
 173         if (!S_ISDIR(mode)) {
 174                 const struct attr_check *check;
 175                 check = get_archive_attrs(args->repo->index, path_without_prefix);
 176                 if (check_attr_export_ignore(check))
 177                         return 0;
 178                 args->convert = check_attr_export_subst(check);
 179         }
 180
 181         if (args->prefix) {
 182                 static struct strbuf new_path = STRBUF_INIT;
 183                 static struct strbuf buf = STRBUF_INIT;
 184                 const char *rel;
 185
 186                 rel = relative_path(path_without_prefix, args->prefix, &buf);
 187
 188                 /*
 189                  * We don't add an entry for the current working
 190                  * directory when we are at the root; skip it also when
 191                  * we're in a subdirectory or submodule.  Skip entries
 192                  * higher up as well.
 193                  */
 194                 if (!strcmp(rel, "./") || starts_with(rel, "../"))
 195                         return S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0;
 196
 197                 /* rel can refer to path, so don't edit it in place */
 198                 strbuf_reset(&new_path);
 199                 strbuf_add(&new_path, args->base, args->baselen);
 200                 strbuf_addstr(&new_path, rel);
 201                 strbuf_swap(&path, &new_path);
 202         }
 203
 204         if (args->verbose)
 205                 fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
 206
 207         if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
 208                 err = write_entry(args, oid, path.buf, path.len, mode, NULL, 0);
 209                 if (err)
 210                         return err;
 211                 return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0);
 212         }
 213
 214         /* Stream it? */
 215         if (S_ISREG(mode) && !args->convert &&
 216             oid_object_info(args->repo, oid, &size) == OBJ_BLOB &&
 217             size > big_file_threshold)
 218                 return write_entry(args, oid, path.buf, path.len, mode, NULL, size);
 219
 220         buffer = object_file_to_archive(args, path.buf, oid, mode, &type, &size);
 221         if (!buffer)
 222                 return error(_("cannot read '%s'"), oid_to_hex(oid));
 223         err = write_entry(args, oid, path.buf, path.len, mode, buffer, size);
 224         free(buffer);
 225         return err;
 226 }
 227
 228 static void queue_directory(const struct object_id *oid,
 229                 struct strbuf *base, const char *filename,
 230                 unsigned mode, struct archiver_context *c)
 231 {
 232         struct directory *d;
 233         size_t len = st_add4(base->len, 1, strlen(filename), 1);
 234         d = xmalloc(st_add(sizeof(*d), len));
 235         d->up      = c->bottom;
 236         d->baselen = base->len;
 237         d->mode    = mode;
 238         c->bottom  = d;
 239         d->len = xsnprintf(d->path, len, "%.*s%s/", (int)base->len, base->buf, filename);
 240         oidcpy(&d->oid, oid);
 241 }
 242
 243 static int write_directory(struct archiver_context *c)
 244 {
 245         struct directory *d = c->bottom;
 246         int ret;
 247
 248         if (!d)
 249                 return 0;
 250         c->bottom = d->up;
 251         d->path[d->len - 1] = '\0'; /* no trailing slash */
 252         ret =
 253                 write_directory(c) ||
 254                 write_archive_entry(&d->oid, d->path, d->baselen,
 255                                     d->path + d->baselen, d->mode,
 256                                     c) != READ_TREE_RECURSIVE;
 257         free(d);
 258         return ret ? -1 : 0;
 259 }
 260
 261 static int queue_or_write_archive_entry(const struct object_id *oid,
 262                 struct strbuf *base, const char *filename,
 263                 unsigned mode, void *context)
 264 {
 265         struct archiver_context *c = context;
 266
 267         while (c->bottom &&
 268                !(base->len >= c->bottom->len &&
 269                  !strncmp(base->buf, c->bottom->path, c->bottom->len))) {
 270                 struct directory *next = c->bottom->up;
 271                 free(c->bottom);
 272                 c->bottom = next;
 273         }
 274
 275         if (S_ISDIR(mode)) {
 276                 size_t baselen = base->len;
 277                 const struct attr_check *check;
 278
 279                 /* Borrow base, but restore its original value when done. */
 280                 strbuf_addstr(base, filename);
 281                 strbuf_addch(base, '/');
 282                 check = get_archive_attrs(c->args->repo->index, base->buf);
 283                 strbuf_setlen(base, baselen);
 284
 285                 if (check_attr_export_ignore(check))
 286                         return 0;
 287                 queue_directory(oid, base, filename, mode, c);
 288                 return READ_TREE_RECURSIVE;
 289         }
 290
 291         if (write_directory(c))
 292                 return -1;
 293         return write_archive_entry(oid, base->buf, base->len, filename, mode,
 294                                    context);
 295 }
 296
 297 struct extra_file_info {
 298         char *base;
 299         struct stat stat;
 300         void *content;
 301 };
 302
 303 int write_archive_entries(struct archiver_args *args,
 304                 write_archive_entry_fn_t write_entry)
 305 {
 306         struct archiver_context context;
 307         struct unpack_trees_options opts;
 308         struct tree_desc t;
 309         int err;
 310         struct strbuf path_in_archive = STRBUF_INIT;
 311         struct strbuf content = STRBUF_INIT;
 312         struct object_id fake_oid;
 313         int i;
 314
 315         oidcpy(&fake_oid, null_oid());
 316
 317         if (args->baselen > 0 && args->base[args->baselen - 1] == '/') {
 318                 size_t len = args->baselen;
 319
 320                 while (len > 1 && args->base[len - 2] == '/')
 321                         len--;
 322                 if (args->verbose)
 323                         fprintf(stderr, "%.*s\n", (int)len, args->base);
 324                 err = write_entry(args, &args->tree->object.oid, args->base,
 325                                   len, 040777, NULL, 0);
 326                 if (err)
 327                         return err;
 328         }
 329
 330         memset(&context, 0, sizeof(context));
 331         context.args = args;
 332         context.write_entry = write_entry;
 333
 334         /*
 335          * Setup index and instruct attr to read index only
 336          */
 337         if (!args->worktree_attributes) {
 338                 memset(&opts, 0, sizeof(opts));
 339                 opts.index_only = 1;
 340                 opts.head_idx = -1;
 341                 opts.src_index = args->repo->index;
 342                 opts.dst_index = args->repo->index;
 343                 opts.fn = oneway_merge;
 344                 init_tree_desc(&t, &args->tree->object.oid,
 345                                args->tree->buffer, args->tree->size);
 346                 if (unpack_trees(1, &t, &opts))
 347                         return -1;
 348                 git_attr_set_direction(GIT_ATTR_INDEX);
 349         }
 350
 351         err = read_tree(args->repo, args->tree,
 352                         &args->pathspec,
 353                         queue_or_write_archive_entry,
 354                         &context);
 355         if (err == READ_TREE_RECURSIVE)
 356                 err = 0;
 357         while (context.bottom) {
 358                 struct directory *next = context.bottom->up;
 359                 free(context.bottom);
 360                 context.bottom = next;
 361         }
 362
 363         for (i = 0; i < args->extra_files.nr; i++) {
 364                 struct string_list_item *item = args->extra_files.items + i;
 365                 char *path = item->string;
 366                 struct extra_file_info *info = item->util;
 367
 368                 put_be64(fake_oid.hash, i + 1);
 369
 370                 if (!info->content) {
 371                         strbuf_reset(&path_in_archive);
 372                         if (info->base)
 373                                 strbuf_addstr(&path_in_archive, info->base);
 374                         strbuf_addstr(&path_in_archive, basename(path));
 375
 376                         strbuf_reset(&content);
 377                         if (strbuf_read_file(&content, path, info->stat.st_size) < 0)
 378                                 err = error_errno(_("cannot read '%s'"), path);
 379                         else
 380                                 err = write_entry(args, &fake_oid, path_in_archive.buf,
 381                                                   path_in_archive.len,
 382                                                   canon_mode(info->stat.st_mode),
 383                                                   content.buf, content.len);
 384                 } else {
 385                         err = write_entry(args, &fake_oid,
 386                                           path, strlen(path),
 387                                           canon_mode(info->stat.st_mode),
 388                                           info->content, info->stat.st_size);
 389                 }
 390
 391                 if (err)
 392                         break;
 393         }
 394         strbuf_release(&path_in_archive);
 395         strbuf_release(&content);
 396
 397         return err;
 398 }
 399
 400 static const struct archiver *lookup_archiver(const char *name)
 401 {
 402         int i;
 403
 404         if (!name)
 405                 return NULL;
 406
 407         for (i = 0; i < nr_archivers; i++) {
 408                 if (!strcmp(name, archivers[i]->name))
 409                         return archivers[i];
 410         }
 411         return NULL;
 412 }
 413
 414 struct path_exists_context {
 415         struct pathspec pathspec;
 416         struct archiver_args *args;
 417 };
 418
 419 static int reject_entry(const struct object_id *oid UNUSED,
 420                         struct strbuf *base,
 421                         const char *filename, unsigned mode,
 422                         void *context)
 423 {
 424         int ret = -1;
 425         struct path_exists_context *ctx = context;
 426
 427         if (S_ISDIR(mode)) {
 428                 struct strbuf sb = STRBUF_INIT;
 429                 strbuf_addbuf(&sb, base);
 430                 strbuf_addstr(&sb, filename);
 431                 if (!match_pathspec(ctx->args->repo->index,
 432                                     &ctx->pathspec,
 433                                     sb.buf, sb.len, 0, NULL, 1))
 434                         ret = READ_TREE_RECURSIVE;
 435                 strbuf_release(&sb);
 436         }
 437         return ret;
 438 }
 439
 440 static int reject_outside(const struct object_id *oid UNUSED,
 441                           struct strbuf *base, const char *filename,
 442                           unsigned mode, void *context)
 443 {
 444         struct archiver_args *args = context;
 445         struct strbuf buf = STRBUF_INIT;
 446         struct strbuf path = STRBUF_INIT;
 447         int ret = 0;
 448
 449         if (S_ISDIR(mode))
 450                 return READ_TREE_RECURSIVE;
 451
 452         strbuf_addbuf(&path, base);
 453         strbuf_addstr(&path, filename);
 454         if (starts_with(relative_path(path.buf, args->prefix, &buf), "../"))
 455                 ret = -1;
 456         strbuf_release(&buf);
 457         strbuf_release(&path);
 458         return ret;
 459 }
 460
 461 static int path_exists(struct archiver_args *args, const char *path)
 462 {
 463         const char *paths[] = { path, NULL };
 464         struct path_exists_context ctx;
 465         int ret;
 466
 467         ctx.args = args;
 468         parse_pathspec(&ctx.pathspec, 0, PATHSPEC_PREFER_CWD,
 469                        args->prefix, paths);
 470         ctx.pathspec.recursive = 1;
 471         if (args->prefix && read_tree(args->repo, args->tree, &ctx.pathspec,
 472                                       reject_outside, args))
 473                 die(_("pathspec '%s' matches files outside the "
 474                       "current directory"), path);
 475         ret = read_tree(args->repo, args->tree,
 476                         &ctx.pathspec,
 477                         reject_entry, &ctx);
 478         clear_pathspec(&ctx.pathspec);
 479         return ret != 0;
 480 }
 481
 482 static void parse_pathspec_arg(const char **pathspec,
 483                 struct archiver_args *ar_args)
 484 {
 485         /*
 486          * must be consistent with parse_pathspec in path_exists()
 487          * Also if pathspec patterns are dependent, we're in big
 488          * trouble as we test each one separately
 489          */
 490         parse_pathspec(&ar_args->pathspec, 0, PATHSPEC_PREFER_CWD,
 491                        ar_args->prefix, pathspec);
 492         ar_args->pathspec.recursive = 1;
 493         if (pathspec) {
 494                 while (*pathspec) {
 495                         if (**pathspec && !path_exists(ar_args, *pathspec))
 496                                 die(_("pathspec '%s' did not match any files"), *pathspec);
 497                         pathspec++;
 498                 }
 499         }
 500 }
 501
 502 static void parse_treeish_arg(const char **argv,
 503                               struct archiver_args *ar_args, int remote)
 504 {
 505         const char *name = argv[0];
 506         const struct object_id *commit_oid;
 507         time_t archive_time;
 508         struct tree *tree;
 509         const struct commit *commit;
 510         struct object_id oid;
 511         char *ref = NULL;
 512
 513         /* Remotes are only allowed to fetch actual refs */
 514         if (remote && !remote_allow_unreachable) {
 515                 const char *colon = strchrnul(name, ':');
 516                 int refnamelen = colon - name;
 517
 518                 if (!repo_dwim_ref(the_repository, name, refnamelen, &oid, &ref, 0))
 519                         die(_("no such ref: %.*s"), refnamelen, name);
 520         } else {
 521                 repo_dwim_ref(the_repository, name, strlen(name), &oid, &ref,
 522                               0);
 523         }
 524
 525         if (repo_get_oid(the_repository, name, &oid))
 526                 die(_("not a valid object name: %s"), name);
 527
 528         commit = lookup_commit_reference_gently(ar_args->repo, &oid, 1);
 529         if (commit) {
 530                 commit_oid = &commit->object.oid;
 531                 archive_time = commit->date;
 532         } else {
 533                 commit_oid = NULL;
 534                 archive_time = time(NULL);
 535         }
 536         if (ar_args->mtime_option)
 537                 archive_time = approxidate(ar_args->mtime_option);
 538
 539         tree = parse_tree_indirect(&oid);
 540         if (!tree)
 541                 die(_("not a tree object: %s"), oid_to_hex(&oid));
 542
 543         ar_args->refname = ref;
 544         ar_args->tree = tree;
 545         ar_args->commit_oid = commit_oid;
 546         ar_args->commit = commit;
 547         ar_args->time = archive_time;
 548 }
 549
 550 static void extra_file_info_clear(void *util, const char *str UNUSED)
 551 {
 552         struct extra_file_info *info = util;
 553         free(info->base);
 554         free(info->content);
 555         free(info);
 556 }
 557
 558 static int add_file_cb(const struct option *opt, const char *arg, int unset)
 559 {
 560         struct archiver_args *args = opt->value;
 561         const char **basep = (const char **)opt->defval;
 562         const char *base = *basep;
 563         char *path;
 564         struct string_list_item *item;
 565         struct extra_file_info *info;
 566
 567         if (unset) {
 568                 string_list_clear_func(&args->extra_files,
 569                                        extra_file_info_clear);
 570                 return 0;
 571         }
 572
 573         if (!arg)
 574                 return -1;
 575
 576         info = xmalloc(sizeof(*info));
 577         info->base = xstrdup_or_null(base);
 578
 579         if (!strcmp(opt->long_name, "add-file")) {
 580                 path = prefix_filename(args->prefix, arg);
 581                 if (stat(path, &info->stat))
 582                         die(_("File not found: %s"), path);
 583                 if (!S_ISREG(info->stat.st_mode))
 584                         die(_("Not a regular file: %s"), path);
 585                 info->content = NULL; /* read the file later */
 586         } else if (!strcmp(opt->long_name, "add-virtual-file")) {
 587                 struct strbuf buf = STRBUF_INIT;
 588                 const char *p = arg;
 589
 590                 if (*p != '"')
 591                         p = strchr(p, ':');
 592                 else if (unquote_c_style(&buf, p, &p) < 0)
 593                         die(_("unclosed quote: '%s'"), arg);
 594
 595                 if (!p || *p != ':')
 596                         die(_("missing colon: '%s'"), arg);
 597
 598                 if (p == arg)
 599                         die(_("empty file name: '%s'"), arg);
 600
 601                 path = buf.len ?
 602                         strbuf_detach(&buf, NULL) : xstrndup(arg, p - arg);
 603
 604                 if (args->prefix) {
 605                         char *save = path;
 606                         path = prefix_filename(args->prefix, path);
 607                         free(save);
 608                 }
 609                 memset(&info->stat, 0, sizeof(info->stat));
 610                 info->stat.st_mode = S_IFREG | 0644;
 611                 info->content = xstrdup(p + 1);
 612                 info->stat.st_size = strlen(info->content);
 613         } else {
 614                 BUG("add_file_cb() called for %s", opt->long_name);
 615         }
 616         item = string_list_append_nodup(&args->extra_files, path);
 617         item->util = info;
 618
 619         return 0;
 620 }
 621
 622 static int number_callback(const struct option *opt, const char *arg, int unset)
 623 {
 624         BUG_ON_OPT_NEG(unset);
 625         *(int *)opt->value = strtol(arg, NULL, 10);
 626         return 0;
 627 }
 628
 629 static int parse_archive_args(int argc, const char **argv,
 630                 const struct archiver **ar, struct archiver_args *args,
 631                 const char *name_hint, int is_remote)
 632 {
 633         const char *format = NULL;
 634         const char *base = NULL;
 635         const char *remote = NULL;
 636         const char *exec = NULL;
 637         const char *output = NULL;
 638         const char *mtime_option = NULL;
 639         int compression_level = -1;
 640         int verbose = 0;
 641         int i;
 642         int list = 0;
 643         int worktree_attributes = 0;
 644         struct option opts[] = {
 645                 OPT_GROUP(""),
 646                 OPT_STRING(0, "format", &format, N_("fmt"), N_("archive format")),
 647                 OPT_STRING(0, "prefix", &base, N_("prefix"),
 648                         N_("prepend prefix to each pathname in the archive")),
 649                 { OPTION_CALLBACK, 0, "add-file", args, N_("file"),
 650                   N_("add untracked file to archive"), 0, add_file_cb,
 651                   (intptr_t)&base },
 652                 { OPTION_CALLBACK, 0, "add-virtual-file", args,
 653                   N_("path:content"), N_("add untracked file to archive"), 0,
 654                   add_file_cb, (intptr_t)&base },
 655                 OPT_STRING('o', "output", &output, N_("file"),
 656                         N_("write the archive to this file")),
 657                 OPT_BOOL(0, "worktree-attributes", &worktree_attributes,
 658                         N_("read .gitattributes in working directory")),
 659                 OPT__VERBOSE(&verbose, N_("report archived files on stderr")),
 660                 { OPTION_STRING, 0, "mtime", &mtime_option, N_("time"),
 661                   N_("set modification time of archive entries"),
 662                   PARSE_OPT_NONEG },
 663                 OPT_NUMBER_CALLBACK(&compression_level,
 664                         N_("set compression level"), number_callback),
 665                 OPT_GROUP(""),
 666                 OPT_BOOL('l', "list", &list,
 667                         N_("list supported archive formats")),
 668                 OPT_GROUP(""),
 669                 OPT_STRING(0, "remote", &remote, N_("repo"),
 670                         N_("retrieve the archive from remote repository <repo>")),
 671                 OPT_STRING(0, "exec", &exec, N_("command"),
 672                         N_("path to the remote git-upload-archive command")),
 673                 OPT_END()
 674         };
 675
 676         argc = parse_options(argc, argv, NULL, opts, archive_usage, 0);
 677
 678         if (remote)
 679                 die(_("Unexpected option --remote"));
 680         if (exec)
 681                 die(_("the option '%s' requires '%s'"), "--exec", "--remote");
 682         if (output)
 683                 die(_("Unexpected option --output"));
 684         if (is_remote && args->extra_files.nr)
 685                 die(_("options '%s' and '%s' cannot be used together"), "--add-file", "--remote");
 686
 687         if (!base)
 688                 base = "";
 689
 690         if (list) {
 691                 if (argc)
 692                         die(_("extra command line parameter '%s'"), *argv);
 693                 for (i = 0; i < nr_archivers; i++)
 694                         if (!is_remote || archivers[i]->flags & ARCHIVER_REMOTE)
 695                                 printf("%s\n", archivers[i]->name);
 696                 exit(0);
 697         }
 698
 699         if (!format && name_hint)
 700                 format = archive_format_from_filename(name_hint);
 701         if (!format)
 702                 format = "tar";
 703
 704         /* We need at least one parameter -- tree-ish */
 705         if (argc < 1)
 706                 usage_with_options(archive_usage, opts);
 707         *ar = lookup_archiver(format);
 708         if (!*ar || (is_remote && !((*ar)->flags & ARCHIVER_REMOTE)))
 709                 die(_("Unknown archive format '%s'"), format);
 710
 711         args->compression_level = Z_DEFAULT_COMPRESSION;
 712         if (compression_level != -1) {
 713                 int levels_ok = (*ar)->flags & ARCHIVER_WANT_COMPRESSION_LEVELS;
 714                 int high_ok = (*ar)->flags & ARCHIVER_HIGH_COMPRESSION_LEVELS;
 715                 if (levels_ok && (compression_level <= 9 || high_ok))
 716                         args->compression_level = compression_level;
 717                 else {
 718                         die(_("Argument not supported for format '%s': -%d"),
 719                                         format, compression_level);
 720                 }
 721         }
 722         args->verbose = verbose;
 723         args->base = base;
 724         args->baselen = strlen(base);
 725         args->worktree_attributes = worktree_attributes;
 726         args->mtime_option = mtime_option;
 727
 728         return argc;
 729 }
 730
 731 int write_archive(int argc, const char **argv, const char *prefix,
 732                   struct repository *repo,
 733                   const char *name_hint, int remote)
 734 {
 735         const struct archiver *ar = NULL;
 736         struct pretty_print_describe_status describe_status = {0};
 737         struct pretty_print_context ctx = {0};
 738         struct archiver_args args;
 739         int rc;
 740
 741         git_config_get_bool("uploadarchive.allowunreachable", &remote_allow_unreachable);
 742         git_config(git_default_config, NULL);
 743
 744         describe_status.max_invocations = 1;
 745         ctx.date_mode.type = DATE_NORMAL;
 746         ctx.abbrev = DEFAULT_ABBREV;
 747         ctx.describe_status = &describe_status;
 748         args.pretty_ctx = &ctx;
 749         args.repo = repo;
 750         args.prefix = prefix;
 751         string_list_init_dup(&args.extra_files);
 752         argc = parse_archive_args(argc, argv, &ar, &args, name_hint, remote);
 753         if (!startup_info->have_repository) {
 754                 /*
 755                  * We know this will die() with an error, so we could just
 756                  * die ourselves; but its error message will be more specific
 757                  * than what we could write here.
 758                  */
 759                 setup_git_directory();
 760         }
 761
 762         parse_treeish_arg(argv, &args, remote);
 763         parse_pathspec_arg(argv + 1, &args);
 764
 765         rc = ar->write_archive(ar, &args);
 766
 767         string_list_clear_func(&args.extra_files, extra_file_info_clear);
 768         free(args.refname);
 769         clear_pathspec(&args.pathspec);
 770
 771         return rc;
 772 }
 773
 774 static int match_extension(const char *filename, const char *ext)
 775 {
 776         int prefixlen = strlen(filename) - strlen(ext);
 777
 778         /*
 779          * We need 1 character for the '.', and 1 character to ensure that the
 780          * prefix is non-empty (k.e., we don't match .tar.gz with no actual
 781          * filename).
 782          */
 783         if (prefixlen < 2 || filename[prefixlen - 1] != '.')
 784                 return 0;
 785         return !strcmp(filename + prefixlen, ext);
 786 }
 787
 788 const char *archive_format_from_filename(const char *filename)
 789 {
 790         int i;
 791
 792         for (i = 0; i < nr_archivers; i++)
 793                 if (match_extension(filename, archivers[i]->name))
 794                         return archivers[i]->name;
 795         return NULL;
 796 }