builtin/repack.c

   1 #include "builtin.h"
   2 #include "cache.h"
   3 #include "config.h"
   4 #include "dir.h"
   5 #include "parse-options.h"
   6 #include "run-command.h"
   7 #include "sigchain.h"
   8 #include "strbuf.h"
   9 #include "string-list.h"
  10 #include "strvec.h"
  11 #include "midx.h"
  12 #include "packfile.h"
  13 #include "prune-packed.h"
  14 #include "object-store.h"
  15 #include "promisor-remote.h"
  16 #include "shallow.h"
  17 #include "pack.h"
  18 #include "pack-bitmap.h"
  19 #include "refs.h"
  20
  21 static int delta_base_offset = 1;
  22 static int pack_kept_objects = -1;
  23 static int write_bitmaps = -1;
  24 static int use_delta_islands;
  25 static char *packdir, *packtmp_name, *packtmp;
  26
  27 static const char *const git_repack_usage[] = {
  28         N_("git repack [<options>]"),
  29         NULL
  30 };
  31
  32 static const char incremental_bitmap_conflict_error[] = N_(
  33 "Incremental repacks are incompatible with bitmap indexes.  Use\n"
  34 "--no-write-bitmap-index or disable the pack.writebitmaps configuration."
  35 );
  36
  37
  38 static int repack_config(const char *var, const char *value, void *cb)
  39 {
  40         if (!strcmp(var, "repack.usedeltabaseoffset")) {
  41                 delta_base_offset = git_config_bool(var, value);
  42                 return 0;
  43         }
  44         if (!strcmp(var, "repack.packkeptobjects")) {
  45                 pack_kept_objects = git_config_bool(var, value);
  46                 return 0;
  47         }
  48         if (!strcmp(var, "repack.writebitmaps") ||
  49             !strcmp(var, "pack.writebitmaps")) {
  50                 write_bitmaps = git_config_bool(var, value);
  51                 return 0;
  52         }
  53         if (!strcmp(var, "repack.usedeltaislands")) {
  54                 use_delta_islands = git_config_bool(var, value);
  55                 return 0;
  56         }
  57         return git_default_config(var, value, cb);
  58 }
  59
  60 /*
  61  * Remove temporary $GIT_OBJECT_DIRECTORY/pack/.tmp-$$-pack-* files.
  62  */
  63 static void remove_temporary_files(void)
  64 {
  65         struct strbuf buf = STRBUF_INIT;
  66         size_t dirlen, prefixlen;
  67         DIR *dir;
  68         struct dirent *e;
  69
  70         dir = opendir(packdir);
  71         if (!dir)
  72                 return;
  73
  74         /* Point at the slash at the end of ".../objects/pack/" */
  75         dirlen = strlen(packdir) + 1;
  76         strbuf_addstr(&buf, packtmp);
  77         /* Hold the length of  ".tmp-%d-pack-" */
  78         prefixlen = buf.len - dirlen;
  79
  80         while ((e = readdir(dir))) {
  81                 if (strncmp(e->d_name, buf.buf + dirlen, prefixlen))
  82                         continue;
  83                 strbuf_setlen(&buf, dirlen);
  84                 strbuf_addstr(&buf, e->d_name);
  85                 unlink(buf.buf);
  86         }
  87         closedir(dir);
  88         strbuf_release(&buf);
  89 }
  90
  91 static void remove_pack_on_signal(int signo)
  92 {
  93         remove_temporary_files();
  94         sigchain_pop(signo);
  95         raise(signo);
  96 }
  97
  98 /*
  99  * Adds all packs hex strings to either fname_nonkept_list or
 100  * fname_kept_list based on whether each pack has a corresponding
 101  * .keep file or not.  Packs without a .keep file are not to be kept
 102  * if we are going to pack everything into one file.
 103  */
 104 static void collect_pack_filenames(struct string_list *fname_nonkept_list,
 105                                    struct string_list *fname_kept_list,
 106                                    const struct string_list *extra_keep)
 107 {
 108         DIR *dir;
 109         struct dirent *e;
 110         char *fname;
 111
 112         if (!(dir = opendir(packdir)))
 113                 return;
 114
 115         while ((e = readdir(dir)) != NULL) {
 116                 size_t len;
 117                 int i;
 118
 119                 if (!strip_suffix(e->d_name, ".pack", &len))
 120                         continue;
 121
 122                 for (i = 0; i < extra_keep->nr; i++)
 123                         if (!fspathcmp(e->d_name, extra_keep->items[i].string))
 124                                 break;
 125
 126                 fname = xmemdupz(e->d_name, len);
 127
 128                 if ((extra_keep->nr > 0 && i < extra_keep->nr) ||
 129                     (file_exists(mkpath("%s/%s.keep", packdir, fname))))
 130                         string_list_append_nodup(fname_kept_list, fname);
 131                 else
 132                         string_list_append_nodup(fname_nonkept_list, fname);
 133         }
 134         closedir(dir);
 135 }
 136
 137 static void remove_redundant_pack(const char *dir_name, const char *base_name)
 138 {
 139         struct strbuf buf = STRBUF_INIT;
 140         struct multi_pack_index *m = get_local_multi_pack_index(the_repository);
 141         strbuf_addf(&buf, "%s.pack", base_name);
 142         if (m && midx_contains_pack(m, buf.buf))
 143                 clear_midx_file(the_repository);
 144         strbuf_insertf(&buf, 0, "%s/", dir_name);
 145         unlink_pack_path(buf.buf, 1);
 146         strbuf_release(&buf);
 147 }
 148
 149 struct pack_objects_args {
 150         const char *window;
 151         const char *window_memory;
 152         const char *depth;
 153         const char *threads;
 154         const char *max_pack_size;
 155         int no_reuse_delta;
 156         int no_reuse_object;
 157         int quiet;
 158         int local;
 159 };
 160
 161 static void prepare_pack_objects(struct child_process *cmd,
 162                                  const struct pack_objects_args *args)
 163 {
 164         strvec_push(&cmd->args, "pack-objects");
 165         if (args->window)
 166                 strvec_pushf(&cmd->args, "--window=%s", args->window);
 167         if (args->window_memory)
 168                 strvec_pushf(&cmd->args, "--window-memory=%s", args->window_memory);
 169         if (args->depth)
 170                 strvec_pushf(&cmd->args, "--depth=%s", args->depth);
 171         if (args->threads)
 172                 strvec_pushf(&cmd->args, "--threads=%s", args->threads);
 173         if (args->max_pack_size)
 174                 strvec_pushf(&cmd->args, "--max-pack-size=%s", args->max_pack_size);
 175         if (args->no_reuse_delta)
 176                 strvec_pushf(&cmd->args, "--no-reuse-delta");
 177         if (args->no_reuse_object)
 178                 strvec_pushf(&cmd->args, "--no-reuse-object");
 179         if (args->local)
 180                 strvec_push(&cmd->args,  "--local");
 181         if (args->quiet)
 182                 strvec_push(&cmd->args,  "--quiet");
 183         if (delta_base_offset)
 184                 strvec_push(&cmd->args,  "--delta-base-offset");
 185         strvec_push(&cmd->args, packtmp);
 186         cmd->git_cmd = 1;
 187         cmd->out = -1;
 188 }
 189
 190 /*
 191  * Write oid to the given struct child_process's stdin, starting it first if
 192  * necessary.
 193  */
 194 static int write_oid(const struct object_id *oid, struct packed_git *pack,
 195                      uint32_t pos, void *data)
 196 {
 197         struct child_process *cmd = data;
 198
 199         if (cmd->in == -1) {
 200                 if (start_command(cmd))
 201                         die(_("could not start pack-objects to repack promisor objects"));
 202         }
 203
 204         xwrite(cmd->in, oid_to_hex(oid), the_hash_algo->hexsz);
 205         xwrite(cmd->in, "\n", 1);
 206         return 0;
 207 }
 208
 209 static struct {
 210         const char *name;
 211         unsigned optional:1;
 212 } exts[] = {
 213         {".pack"},
 214         {".rev", 1},
 215         {".bitmap", 1},
 216         {".promisor", 1},
 217         {".idx"},
 218 };
 219
 220 static unsigned populate_pack_exts(char *name)
 221 {
 222         struct stat statbuf;
 223         struct strbuf path = STRBUF_INIT;
 224         unsigned ret = 0;
 225         int i;
 226
 227         for (i = 0; i < ARRAY_SIZE(exts); i++) {
 228                 strbuf_reset(&path);
 229                 strbuf_addf(&path, "%s-%s%s", packtmp, name, exts[i].name);
 230
 231                 if (stat(path.buf, &statbuf))
 232                         continue;
 233
 234                 ret |= (1 << i);
 235         }
 236
 237         strbuf_release(&path);
 238         return ret;
 239 }
 240
 241 static void repack_promisor_objects(const struct pack_objects_args *args,
 242                                     struct string_list *names)
 243 {
 244         struct child_process cmd = CHILD_PROCESS_INIT;
 245         FILE *out;
 246         struct strbuf line = STRBUF_INIT;
 247
 248         prepare_pack_objects(&cmd, args);
 249         cmd.in = -1;
 250
 251         /*
 252          * NEEDSWORK: Giving pack-objects only the OIDs without any ordering
 253          * hints may result in suboptimal deltas in the resulting pack. See if
 254          * the OIDs can be sent with fake paths such that pack-objects can use a
 255          * {type -> existing pack order} ordering when computing deltas instead
 256          * of a {type -> size} ordering, which may produce better deltas.
 257          */
 258         for_each_packed_object(write_oid, &cmd,
 259                                FOR_EACH_OBJECT_PROMISOR_ONLY);
 260
 261         if (cmd.in == -1)
 262                 /* No packed objects; cmd was never started */
 263                 return;
 264
 265         close(cmd.in);
 266
 267         out = xfdopen(cmd.out, "r");
 268         while (strbuf_getline_lf(&line, out) != EOF) {
 269                 struct string_list_item *item;
 270                 char *promisor_name;
 271
 272                 if (line.len != the_hash_algo->hexsz)
 273                         die(_("repack: Expecting full hex object ID lines only from pack-objects."));
 274                 item = string_list_append(names, line.buf);
 275
 276                 /*
 277                  * pack-objects creates the .pack and .idx files, but not the
 278                  * .promisor file. Create the .promisor file, which is empty.
 279                  *
 280                  * NEEDSWORK: fetch-pack sometimes generates non-empty
 281                  * .promisor files containing the ref names and associated
 282                  * hashes at the point of generation of the corresponding
 283                  * packfile, but this would not preserve their contents. Maybe
 284                  * concatenate the contents of all .promisor files instead of
 285                  * just creating a new empty file.
 286                  */
 287                 promisor_name = mkpathdup("%s-%s.promisor", packtmp,
 288                                           line.buf);
 289                 write_promisor_file(promisor_name, NULL, 0);
 290
 291                 item->util = (void *)(uintptr_t)populate_pack_exts(item->string);
 292
 293                 free(promisor_name);
 294         }
 295         fclose(out);
 296         if (finish_command(&cmd))
 297                 die(_("could not finish pack-objects to repack promisor objects"));
 298 }
 299
 300 #define ALL_INTO_ONE 1
 301 #define LOOSEN_UNREACHABLE 2
 302
 303 struct pack_geometry {
 304         struct packed_git **pack;
 305         uint32_t pack_nr, pack_alloc;
 306         uint32_t split;
 307 };
 308
 309 static uint32_t geometry_pack_weight(struct packed_git *p)
 310 {
 311         if (open_pack_index(p))
 312                 die(_("cannot open index for %s"), p->pack_name);
 313         return p->num_objects;
 314 }
 315
 316 static int geometry_cmp(const void *va, const void *vb)
 317 {
 318         uint32_t aw = geometry_pack_weight(*(struct packed_git **)va),
 319                  bw = geometry_pack_weight(*(struct packed_git **)vb);
 320
 321         if (aw < bw)
 322                 return -1;
 323         if (aw > bw)
 324                 return 1;
 325         return 0;
 326 }
 327
 328 static void init_pack_geometry(struct pack_geometry **geometry_p)
 329 {
 330         struct packed_git *p;
 331         struct pack_geometry *geometry;
 332
 333         *geometry_p = xcalloc(1, sizeof(struct pack_geometry));
 334         geometry = *geometry_p;
 335
 336         for (p = get_all_packs(the_repository); p; p = p->next) {
 337                 if (!pack_kept_objects && p->pack_keep)
 338                         continue;
 339
 340                 ALLOC_GROW(geometry->pack,
 341                            geometry->pack_nr + 1,
 342                            geometry->pack_alloc);
 343
 344                 geometry->pack[geometry->pack_nr] = p;
 345                 geometry->pack_nr++;
 346         }
 347
 348         QSORT(geometry->pack, geometry->pack_nr, geometry_cmp);
 349 }
 350
 351 static void split_pack_geometry(struct pack_geometry *geometry, int factor)
 352 {
 353         uint32_t i;
 354         uint32_t split;
 355         off_t total_size = 0;
 356
 357         if (!geometry->pack_nr) {
 358                 geometry->split = geometry->pack_nr;
 359                 return;
 360         }
 361
 362         /*
 363          * First, count the number of packs (in descending order of size) which
 364          * already form a geometric progression.
 365          */
 366         for (i = geometry->pack_nr - 1; i > 0; i--) {
 367                 struct packed_git *ours = geometry->pack[i];
 368                 struct packed_git *prev = geometry->pack[i - 1];
 369
 370                 if (unsigned_mult_overflows(factor, geometry_pack_weight(prev)))
 371                         die(_("pack %s too large to consider in geometric "
 372                               "progression"),
 373                             prev->pack_name);
 374
 375                 if (geometry_pack_weight(ours) < factor * geometry_pack_weight(prev))
 376                         break;
 377         }
 378
 379         split = i;
 380
 381         if (split) {
 382                 /*
 383                  * Move the split one to the right, since the top element in the
 384                  * last-compared pair can't be in the progression. Only do this
 385                  * when we split in the middle of the array (otherwise if we got
 386                  * to the end, then the split is in the right place).
 387                  */
 388                 split++;
 389         }
 390
 391         /*
 392          * Then, anything to the left of 'split' must be in a new pack. But,
 393          * creating that new pack may cause packs in the heavy half to no longer
 394          * form a geometric progression.
 395          *
 396          * Compute an expected size of the new pack, and then determine how many
 397          * packs in the heavy half need to be joined into it (if any) to restore
 398          * the geometric progression.
 399          */
 400         for (i = 0; i < split; i++) {
 401                 struct packed_git *p = geometry->pack[i];
 402
 403                 if (unsigned_add_overflows(total_size, geometry_pack_weight(p)))
 404                         die(_("pack %s too large to roll up"), p->pack_name);
 405                 total_size += geometry_pack_weight(p);
 406         }
 407         for (i = split; i < geometry->pack_nr; i++) {
 408                 struct packed_git *ours = geometry->pack[i];
 409
 410                 if (unsigned_mult_overflows(factor, total_size))
 411                         die(_("pack %s too large to roll up"), ours->pack_name);
 412
 413                 if (geometry_pack_weight(ours) < factor * total_size) {
 414                         if (unsigned_add_overflows(total_size,
 415                                                    geometry_pack_weight(ours)))
 416                                 die(_("pack %s too large to roll up"),
 417                                     ours->pack_name);
 418
 419                         split++;
 420                         total_size += geometry_pack_weight(ours);
 421                 } else
 422                         break;
 423         }
 424
 425         geometry->split = split;
 426 }
 427
 428 static struct packed_git *get_largest_active_pack(struct pack_geometry *geometry)
 429 {
 430         if (!geometry) {
 431                 /*
 432                  * No geometry means either an all-into-one repack (in which
 433                  * case there is only one pack left and it is the largest) or an
 434                  * incremental one.
 435                  *
 436                  * If repacking incrementally, then we could check the size of
 437                  * all packs to determine which should be preferred, but leave
 438                  * this for later.
 439                  */
 440                 return NULL;
 441         }
 442         if (geometry->split == geometry->pack_nr)
 443                 return NULL;
 444         return geometry->pack[geometry->pack_nr - 1];
 445 }
 446
 447 static void clear_pack_geometry(struct pack_geometry *geometry)
 448 {
 449         if (!geometry)
 450                 return;
 451
 452         free(geometry->pack);
 453         geometry->pack_nr = 0;
 454         geometry->pack_alloc = 0;
 455         geometry->split = 0;
 456 }
 457
 458 struct midx_snapshot_ref_data {
 459         struct tempfile *f;
 460         struct oidset seen;
 461         int preferred;
 462 };
 463
 464 static int midx_snapshot_ref_one(const char *refname,
 465                                  const struct object_id *oid,
 466                                  int flag, void *_data)
 467 {
 468         struct midx_snapshot_ref_data *data = _data;
 469         struct object_id peeled;
 470
 471         if (!peel_iterated_oid(oid, &peeled))
 472                 oid = &peeled;
 473
 474         if (oidset_insert(&data->seen, oid))
 475                 return 0; /* already seen */
 476
 477         if (oid_object_info(the_repository, oid, NULL) != OBJ_COMMIT)
 478                 return 0;
 479
 480         fprintf(data->f->fp, "%s%s\n", data->preferred ? "+" : "",
 481                 oid_to_hex(oid));
 482
 483         return 0;
 484 }
 485
 486 static void midx_snapshot_refs(struct tempfile *f)
 487 {
 488         struct midx_snapshot_ref_data data;
 489         const struct string_list *preferred = bitmap_preferred_tips(the_repository);
 490
 491         data.f = f;
 492         data.preferred = 0;
 493         oidset_init(&data.seen, 0);
 494
 495         if (!fdopen_tempfile(f, "w"))
 496                  die(_("could not open tempfile %s for writing"),
 497                      get_tempfile_path(f));
 498
 499         if (preferred) {
 500                 struct string_list_item *item;
 501
 502                 data.preferred = 1;
 503                 for_each_string_list_item(item, preferred)
 504                         for_each_ref_in(item->string, midx_snapshot_ref_one, &data);
 505                 data.preferred = 0;
 506         }
 507
 508         for_each_ref(midx_snapshot_ref_one, &data);
 509
 510         if (close_tempfile_gently(f)) {
 511                 int save_errno = errno;
 512                 delete_tempfile(&f);
 513                 errno = save_errno;
 514                 die_errno(_("could not close refs snapshot tempfile"));
 515         }
 516
 517         oidset_clear(&data.seen);
 518 }
 519
 520 static void midx_included_packs(struct string_list *include,
 521                                 struct string_list *existing_nonkept_packs,
 522                                 struct string_list *existing_kept_packs,
 523                                 struct string_list *names,
 524                                 struct pack_geometry *geometry)
 525 {
 526         struct string_list_item *item;
 527
 528         for_each_string_list_item(item, existing_kept_packs)
 529                 string_list_insert(include, xstrfmt("%s.idx", item->string));
 530         for_each_string_list_item(item, names)
 531                 string_list_insert(include, xstrfmt("pack-%s.idx", item->string));
 532         if (geometry) {
 533                 struct strbuf buf = STRBUF_INIT;
 534                 uint32_t i;
 535                 for (i = geometry->split; i < geometry->pack_nr; i++) {
 536                         struct packed_git *p = geometry->pack[i];
 537
 538                         strbuf_addstr(&buf, pack_basename(p));
 539                         strbuf_strip_suffix(&buf, ".pack");
 540                         strbuf_addstr(&buf, ".idx");
 541
 542                         string_list_insert(include, strbuf_detach(&buf, NULL));
 543                 }
 544         } else {
 545                 for_each_string_list_item(item, existing_nonkept_packs) {
 546                         if (item->util)
 547                                 continue;
 548                         string_list_insert(include, xstrfmt("%s.idx", item->string));
 549                 }
 550         }
 551 }
 552
 553 static int write_midx_included_packs(struct string_list *include,
 554                                      struct pack_geometry *geometry,
 555                                      const char *refs_snapshot,
 556                                      int show_progress, int write_bitmaps)
 557 {
 558         struct child_process cmd = CHILD_PROCESS_INIT;
 559         struct string_list_item *item;
 560         struct packed_git *largest = get_largest_active_pack(geometry);
 561         FILE *in;
 562         int ret;
 563
 564         if (!include->nr)
 565                 return 0;
 566
 567         cmd.in = -1;
 568         cmd.git_cmd = 1;
 569
 570         strvec_push(&cmd.args, "multi-pack-index");
 571         strvec_pushl(&cmd.args, "write", "--stdin-packs", NULL);
 572
 573         if (show_progress)
 574                 strvec_push(&cmd.args, "--progress");
 575         else
 576                 strvec_push(&cmd.args, "--no-progress");
 577
 578         if (write_bitmaps)
 579                 strvec_push(&cmd.args, "--bitmap");
 580
 581         if (largest)
 582                 strvec_pushf(&cmd.args, "--preferred-pack=%s",
 583                              pack_basename(largest));
 584
 585         if (refs_snapshot)
 586                 strvec_pushf(&cmd.args, "--refs-snapshot=%s", refs_snapshot);
 587
 588         ret = start_command(&cmd);
 589         if (ret)
 590                 return ret;
 591
 592         in = xfdopen(cmd.in, "w");
 593         for_each_string_list_item(item, include)
 594                 fprintf(in, "%s\n", item->string);
 595         fclose(in);
 596
 597         return finish_command(&cmd);
 598 }
 599
 600 int cmd_repack(int argc, const char **argv, const char *prefix)
 601 {
 602         struct child_process cmd = CHILD_PROCESS_INIT;
 603         struct string_list_item *item;
 604         struct string_list names = STRING_LIST_INIT_DUP;
 605         struct string_list rollback = STRING_LIST_INIT_NODUP;
 606         struct string_list existing_nonkept_packs = STRING_LIST_INIT_DUP;
 607         struct string_list existing_kept_packs = STRING_LIST_INIT_DUP;
 608         struct pack_geometry *geometry = NULL;
 609         struct strbuf line = STRBUF_INIT;
 610         struct tempfile *refs_snapshot = NULL;
 611         int i, ext, ret;
 612         FILE *out;
 613         int show_progress = isatty(2);
 614
 615         /* variables to be filled by option parsing */
 616         int pack_everything = 0;
 617         int delete_redundant = 0;
 618         const char *unpack_unreachable = NULL;
 619         int keep_unreachable = 0;
 620         struct string_list keep_pack_list = STRING_LIST_INIT_NODUP;
 621         int no_update_server_info = 0;
 622         struct pack_objects_args po_args = {NULL};
 623         int geometric_factor = 0;
 624         int write_midx = 0;
 625
 626         struct option builtin_repack_options[] = {
 627                 OPT_BIT('a', NULL, &pack_everything,
 628                                 N_("pack everything in a single pack"), ALL_INTO_ONE),
 629                 OPT_BIT('A', NULL, &pack_everything,
 630                                 N_("same as -a, and turn unreachable objects loose"),
 631                                    LOOSEN_UNREACHABLE | ALL_INTO_ONE),
 632                 OPT_BOOL('d', NULL, &delete_redundant,
 633                                 N_("remove redundant packs, and run git-prune-packed")),
 634                 OPT_BOOL('f', NULL, &po_args.no_reuse_delta,
 635                                 N_("pass --no-reuse-delta to git-pack-objects")),
 636                 OPT_BOOL('F', NULL, &po_args.no_reuse_object,
 637                                 N_("pass --no-reuse-object to git-pack-objects")),
 638                 OPT_BOOL('n', NULL, &no_update_server_info,
 639                                 N_("do not run git-update-server-info")),
 640                 OPT__QUIET(&po_args.quiet, N_("be quiet")),
 641                 OPT_BOOL('l', "local", &po_args.local,
 642                                 N_("pass --local to git-pack-objects")),
 643                 OPT_BOOL('b', "write-bitmap-index", &write_bitmaps,
 644                                 N_("write bitmap index")),
 645                 OPT_BOOL('i', "delta-islands", &use_delta_islands,
 646                                 N_("pass --delta-islands to git-pack-objects")),
 647                 OPT_STRING(0, "unpack-unreachable", &unpack_unreachable, N_("approxidate"),
 648                                 N_("with -A, do not loosen objects older than this")),
 649                 OPT_BOOL('k', "keep-unreachable", &keep_unreachable,
 650                                 N_("with -a, repack unreachable objects")),
 651                 OPT_STRING(0, "window", &po_args.window, N_("n"),
 652                                 N_("size of the window used for delta compression")),
 653                 OPT_STRING(0, "window-memory", &po_args.window_memory, N_("bytes"),
 654                                 N_("same as the above, but limit memory size instead of entries count")),
 655                 OPT_STRING(0, "depth", &po_args.depth, N_("n"),
 656                                 N_("limits the maximum delta depth")),
 657                 OPT_STRING(0, "threads", &po_args.threads, N_("n"),
 658                                 N_("limits the maximum number of threads")),
 659                 OPT_STRING(0, "max-pack-size", &po_args.max_pack_size, N_("bytes"),
 660                                 N_("maximum size of each packfile")),
 661                 OPT_BOOL(0, "pack-kept-objects", &pack_kept_objects,
 662                                 N_("repack objects in packs marked with .keep")),
 663                 OPT_STRING_LIST(0, "keep-pack", &keep_pack_list, N_("name"),
 664                                 N_("do not repack this pack")),
 665                 OPT_INTEGER('g', "geometric", &geometric_factor,
 666                             N_("find a geometric progression with factor <N>")),
 667                 OPT_BOOL('m', "write-midx", &write_midx,
 668                            N_("write a multi-pack index of the resulting packs")),
 669                 OPT_END()
 670         };
 671
 672         git_config(repack_config, NULL);
 673
 674         argc = parse_options(argc, argv, prefix, builtin_repack_options,
 675                                 git_repack_usage, 0);
 676
 677         if (delete_redundant && repository_format_precious_objects)
 678                 die(_("cannot delete packs in a precious-objects repo"));
 679
 680         if (keep_unreachable &&
 681             (unpack_unreachable || (pack_everything & LOOSEN_UNREACHABLE)))
 682                 die(_("--keep-unreachable and -A are incompatible"));
 683
 684         if (write_bitmaps < 0) {
 685                 if (!write_midx &&
 686                     (!(pack_everything & ALL_INTO_ONE) || !is_bare_repository()))
 687                         write_bitmaps = 0;
 688         } else if (write_bitmaps &&
 689                    git_env_bool(GIT_TEST_MULTI_PACK_INDEX, 0) &&
 690                    git_env_bool(GIT_TEST_MULTI_PACK_INDEX_WRITE_BITMAP, 0)) {
 691                 write_bitmaps = 0;
 692         }
 693         if (pack_kept_objects < 0)
 694                 pack_kept_objects = write_bitmaps > 0;
 695
 696         if (write_bitmaps && !(pack_everything & ALL_INTO_ONE) && !write_midx)
 697                 die(_(incremental_bitmap_conflict_error));
 698
 699         if (write_midx && write_bitmaps) {
 700                 struct strbuf path = STRBUF_INIT;
 701
 702                 strbuf_addf(&path, "%s/%s_XXXXXX", get_object_directory(),
 703                             "bitmap-ref-tips");
 704
 705                 refs_snapshot = xmks_tempfile(path.buf);
 706                 midx_snapshot_refs(refs_snapshot);
 707
 708                 strbuf_release(&path);
 709         }
 710
 711         if (geometric_factor) {
 712                 if (pack_everything)
 713                         die(_("--geometric is incompatible with -A, -a"));
 714                 init_pack_geometry(&geometry);
 715                 split_pack_geometry(geometry, geometric_factor);
 716         }
 717
 718         packdir = mkpathdup("%s/pack", get_object_directory());
 719         packtmp_name = xstrfmt(".tmp-%d-pack", (int)getpid());
 720         packtmp = mkpathdup("%s/%s", packdir, packtmp_name);
 721
 722         sigchain_push_common(remove_pack_on_signal);
 723
 724         prepare_pack_objects(&cmd, &po_args);
 725
 726         strvec_push(&cmd.args, "--keep-true-parents");
 727         if (!pack_kept_objects)
 728                 strvec_push(&cmd.args, "--honor-pack-keep");
 729         for (i = 0; i < keep_pack_list.nr; i++)
 730                 strvec_pushf(&cmd.args, "--keep-pack=%s",
 731                              keep_pack_list.items[i].string);
 732         strvec_push(&cmd.args, "--non-empty");
 733         if (!geometry) {
 734                 /*
 735                  * We need to grab all reachable objects, including those that
 736                  * are reachable from reflogs and the index.
 737                  *
 738                  * When repacking into a geometric progression of packs,
 739                  * however, we ask 'git pack-objects --stdin-packs', and it is
 740                  * not about packing objects based on reachability but about
 741                  * repacking all the objects in specified packs and loose ones
 742                  * (indeed, --stdin-packs is incompatible with these options).
 743                  */
 744                 strvec_push(&cmd.args, "--all");
 745                 strvec_push(&cmd.args, "--reflog");
 746                 strvec_push(&cmd.args, "--indexed-objects");
 747         }
 748         if (has_promisor_remote())
 749                 strvec_push(&cmd.args, "--exclude-promisor-objects");
 750         if (!write_midx) {
 751                 if (write_bitmaps > 0)
 752                         strvec_push(&cmd.args, "--write-bitmap-index");
 753                 else if (write_bitmaps < 0)
 754                         strvec_push(&cmd.args, "--write-bitmap-index-quiet");
 755         }
 756         if (use_delta_islands)
 757                 strvec_push(&cmd.args, "--delta-islands");
 758
 759         collect_pack_filenames(&existing_nonkept_packs, &existing_kept_packs,
 760                                &keep_pack_list);
 761
 762         if (pack_everything & ALL_INTO_ONE) {
 763                 repack_promisor_objects(&po_args, &names);
 764
 765                 if (existing_nonkept_packs.nr && delete_redundant) {
 766                         for_each_string_list_item(item, &names) {
 767                                 strvec_pushf(&cmd.args, "--keep-pack=%s-%s.pack",
 768                                              packtmp_name, item->string);
 769                         }
 770                         if (unpack_unreachable) {
 771                                 strvec_pushf(&cmd.args,
 772                                              "--unpack-unreachable=%s",
 773                                              unpack_unreachable);
 774                         } else if (pack_everything & LOOSEN_UNREACHABLE) {
 775                                 strvec_push(&cmd.args,
 776                                             "--unpack-unreachable");
 777                         } else if (keep_unreachable) {
 778                                 strvec_push(&cmd.args, "--keep-unreachable");
 779                                 strvec_push(&cmd.args, "--pack-loose-unreachable");
 780                         }
 781                 }
 782         } else if (geometry) {
 783                 strvec_push(&cmd.args, "--stdin-packs");
 784                 strvec_push(&cmd.args, "--unpacked");
 785         } else {
 786                 strvec_push(&cmd.args, "--unpacked");
 787                 strvec_push(&cmd.args, "--incremental");
 788         }
 789
 790         if (geometry)
 791                 cmd.in = -1;
 792         else
 793                 cmd.no_stdin = 1;
 794
 795         ret = start_command(&cmd);
 796         if (ret)
 797                 return ret;
 798
 799         if (geometry) {
 800                 FILE *in = xfdopen(cmd.in, "w");
 801                 /*
 802                  * The resulting pack should contain all objects in packs that
 803                  * are going to be rolled up, but exclude objects in packs which
 804                  * are being left alone.
 805                  */
 806                 for (i = 0; i < geometry->split; i++)
 807                         fprintf(in, "%s\n", pack_basename(geometry->pack[i]));
 808                 for (i = geometry->split; i < geometry->pack_nr; i++)
 809                         fprintf(in, "^%s\n", pack_basename(geometry->pack[i]));
 810                 fclose(in);
 811         }
 812
 813         out = xfdopen(cmd.out, "r");
 814         while (strbuf_getline_lf(&line, out) != EOF) {
 815                 if (line.len != the_hash_algo->hexsz)
 816                         die(_("repack: Expecting full hex object ID lines only from pack-objects."));
 817                 string_list_append(&names, line.buf);
 818         }
 819         fclose(out);
 820         ret = finish_command(&cmd);
 821         if (ret)
 822                 return ret;
 823
 824         if (!names.nr && !po_args.quiet)
 825                 printf_ln(_("Nothing new to pack."));
 826
 827         for_each_string_list_item(item, &names) {
 828                 item->util = (void *)(uintptr_t)populate_pack_exts(item->string);
 829         }
 830
 831         close_object_store(the_repository->objects);
 832
 833         /*
 834          * Ok we have prepared all new packfiles.
 835          */
 836         for_each_string_list_item(item, &names) {
 837                 for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
 838                         char *fname, *fname_old;
 839
 840                         fname = mkpathdup("%s/pack-%s%s",
 841                                         packdir, item->string, exts[ext].name);
 842                         fname_old = mkpathdup("%s-%s%s",
 843                                         packtmp, item->string, exts[ext].name);
 844
 845                         if (((uintptr_t)item->util) & (1 << ext)) {
 846                                 struct stat statbuffer;
 847                                 if (!stat(fname_old, &statbuffer)) {
 848                                         statbuffer.st_mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH);
 849                                         chmod(fname_old, statbuffer.st_mode);
 850                                 }
 851
 852                                 if (rename(fname_old, fname))
 853                                         die_errno(_("renaming '%s' failed"), fname_old);
 854                         } else if (!exts[ext].optional)
 855                                 die(_("missing required file: %s"), fname_old);
 856                         else if (unlink(fname) < 0 && errno != ENOENT)
 857                                 die_errno(_("could not unlink: %s"), fname);
 858
 859                         free(fname);
 860                         free(fname_old);
 861                 }
 862         }
 863         /* End of pack replacement. */
 864
 865         if (delete_redundant && pack_everything & ALL_INTO_ONE) {
 866                 const int hexsz = the_hash_algo->hexsz;
 867                 string_list_sort(&names);
 868                 for_each_string_list_item(item, &existing_nonkept_packs) {
 869                         char *sha1;
 870                         size_t len = strlen(item->string);
 871                         if (len < hexsz)
 872                                 continue;
 873                         sha1 = item->string + len - hexsz;
 874                         /*
 875                          * Mark this pack for deletion, which ensures that this
 876                          * pack won't be included in a MIDX (if `--write-midx`
 877                          * was given) and that we will actually delete this pack
 878                          * (if `-d` was given).
 879                          */
 880                         item->util = (void*)(intptr_t)!string_list_has_string(&names, sha1);
 881                 }
 882         }
 883
 884         if (write_midx) {
 885                 struct string_list include = STRING_LIST_INIT_NODUP;
 886                 midx_included_packs(&include, &existing_nonkept_packs,
 887                                     &existing_kept_packs, &names, geometry);
 888
 889                 ret = write_midx_included_packs(&include, geometry,
 890                                                 refs_snapshot ? get_tempfile_path(refs_snapshot) : NULL,
 891                                                 show_progress, write_bitmaps > 0);
 892
 893                 string_list_clear(&include, 0);
 894
 895                 if (ret)
 896                         return ret;
 897         }
 898
 899         reprepare_packed_git(the_repository);
 900
 901         if (delete_redundant) {
 902                 int opts = 0;
 903                 for_each_string_list_item(item, &existing_nonkept_packs) {
 904                         if (!item->util)
 905                                 continue;
 906                         remove_redundant_pack(packdir, item->string);
 907                 }
 908
 909                 if (geometry) {
 910                         struct strbuf buf = STRBUF_INIT;
 911
 912                         uint32_t i;
 913                         for (i = 0; i < geometry->split; i++) {
 914                                 struct packed_git *p = geometry->pack[i];
 915                                 if (string_list_has_string(&names,
 916                                                            hash_to_hex(p->hash)))
 917                                         continue;
 918
 919                                 strbuf_reset(&buf);
 920                                 strbuf_addstr(&buf, pack_basename(p));
 921                                 strbuf_strip_suffix(&buf, ".pack");
 922
 923                                 remove_redundant_pack(packdir, buf.buf);
 924                         }
 925                         strbuf_release(&buf);
 926                 }
 927                 if (!po_args.quiet && show_progress)
 928                         opts |= PRUNE_PACKED_VERBOSE;
 929                 prune_packed_objects(opts);
 930
 931                 if (!keep_unreachable &&
 932                     (!(pack_everything & LOOSEN_UNREACHABLE) ||
 933                      unpack_unreachable) &&
 934                     is_repository_shallow(the_repository))
 935                         prune_shallow(PRUNE_QUICK);
 936         }
 937
 938         if (!no_update_server_info)
 939                 update_server_info(0);
 940         remove_temporary_files();
 941
 942         if (git_env_bool(GIT_TEST_MULTI_PACK_INDEX, 0)) {
 943                 unsigned flags = 0;
 944                 if (git_env_bool(GIT_TEST_MULTI_PACK_INDEX_WRITE_BITMAP, 0))
 945                         flags |= MIDX_WRITE_BITMAP | MIDX_WRITE_REV_INDEX;
 946                 write_midx_file(get_object_directory(), NULL, NULL, flags);
 947         }
 948
 949         string_list_clear(&names, 0);
 950         string_list_clear(&rollback, 0);
 951         string_list_clear(&existing_nonkept_packs, 0);
 952         string_list_clear(&existing_kept_packs, 0);
 953         clear_pack_geometry(geometry);
 954         strbuf_release(&line);
 955
 956         return 0;
 957 }