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
  19 static int delta_base_offset = 1;
  20 static int pack_kept_objects = -1;
  21 static int write_bitmaps = -1;
  22 static int use_delta_islands;
  23 static char *packdir, *packtmp_name, *packtmp;
  24
  25 static const char *const git_repack_usage[] = {
  26         N_("git repack [<options>]"),
  27         NULL
  28 };
  29
  30 static const char incremental_bitmap_conflict_error[] = N_(
  31 "Incremental repacks are incompatible with bitmap indexes.  Use\n"
  32 "--no-write-bitmap-index or disable the pack.writebitmaps configuration."
  33 );
  34
  35
  36 static int repack_config(const char *var, const char *value, void *cb)
  37 {
  38         if (!strcmp(var, "repack.usedeltabaseoffset")) {
  39                 delta_base_offset = git_config_bool(var, value);
  40                 return 0;
  41         }
  42         if (!strcmp(var, "repack.packkeptobjects")) {
  43                 pack_kept_objects = git_config_bool(var, value);
  44                 return 0;
  45         }
  46         if (!strcmp(var, "repack.writebitmaps") ||
  47             !strcmp(var, "pack.writebitmaps")) {
  48                 write_bitmaps = git_config_bool(var, value);
  49                 return 0;
  50         }
  51         if (!strcmp(var, "repack.usedeltaislands")) {
  52                 use_delta_islands = git_config_bool(var, value);
  53                 return 0;
  54         }
  55         return git_default_config(var, value, cb);
  56 }
  57
  58 /*
  59  * Remove temporary $GIT_OBJECT_DIRECTORY/pack/.tmp-$$-pack-* files.
  60  */
  61 static void remove_temporary_files(void)
  62 {
  63         struct strbuf buf = STRBUF_INIT;
  64         size_t dirlen, prefixlen;
  65         DIR *dir;
  66         struct dirent *e;
  67
  68         dir = opendir(packdir);
  69         if (!dir)
  70                 return;
  71
  72         /* Point at the slash at the end of ".../objects/pack/" */
  73         dirlen = strlen(packdir) + 1;
  74         strbuf_addstr(&buf, packtmp);
  75         /* Hold the length of  ".tmp-%d-pack-" */
  76         prefixlen = buf.len - dirlen;
  77
  78         while ((e = readdir(dir))) {
  79                 if (strncmp(e->d_name, buf.buf + dirlen, prefixlen))
  80                         continue;
  81                 strbuf_setlen(&buf, dirlen);
  82                 strbuf_addstr(&buf, e->d_name);
  83                 unlink(buf.buf);
  84         }
  85         closedir(dir);
  86         strbuf_release(&buf);
  87 }
  88
  89 static void remove_pack_on_signal(int signo)
  90 {
  91         remove_temporary_files();
  92         sigchain_pop(signo);
  93         raise(signo);
  94 }
  95
  96 /*
  97  * Adds all packs hex strings to the fname list, which do not
  98  * have a corresponding .keep file. These packs are not to
  99  * be kept if we are going to pack everything into one file.
 100  */
 101 static void get_non_kept_pack_filenames(struct string_list *fname_list,
 102                                         const struct string_list *extra_keep)
 103 {
 104         DIR *dir;
 105         struct dirent *e;
 106         char *fname;
 107
 108         if (!(dir = opendir(packdir)))
 109                 return;
 110
 111         while ((e = readdir(dir)) != NULL) {
 112                 size_t len;
 113                 int i;
 114
 115                 for (i = 0; i < extra_keep->nr; i++)
 116                         if (!fspathcmp(e->d_name, extra_keep->items[i].string))
 117                                 break;
 118                 if (extra_keep->nr > 0 && i < extra_keep->nr)
 119                         continue;
 120
 121                 if (!strip_suffix(e->d_name, ".pack", &len))
 122                         continue;
 123
 124                 fname = xmemdupz(e->d_name, len);
 125
 126                 if (!file_exists(mkpath("%s/%s.keep", packdir, fname)))
 127                         string_list_append_nodup(fname_list, fname);
 128                 else
 129                         free(fname);
 130         }
 131         closedir(dir);
 132 }
 133
 134 static void remove_redundant_pack(const char *dir_name, const char *base_name)
 135 {
 136         struct strbuf buf = STRBUF_INIT;
 137         struct multi_pack_index *m = get_local_multi_pack_index(the_repository);
 138         strbuf_addf(&buf, "%s.pack", base_name);
 139         if (m && midx_contains_pack(m, buf.buf))
 140                 clear_midx_file(the_repository);
 141         strbuf_insertf(&buf, 0, "%s/", dir_name);
 142         unlink_pack_path(buf.buf, 1);
 143         strbuf_release(&buf);
 144 }
 145
 146 struct pack_objects_args {
 147         const char *window;
 148         const char *window_memory;
 149         const char *depth;
 150         const char *threads;
 151         const char *max_pack_size;
 152         int no_reuse_delta;
 153         int no_reuse_object;
 154         int quiet;
 155         int local;
 156 };
 157
 158 static void prepare_pack_objects(struct child_process *cmd,
 159                                  const struct pack_objects_args *args)
 160 {
 161         strvec_push(&cmd->args, "pack-objects");
 162         if (args->window)
 163                 strvec_pushf(&cmd->args, "--window=%s", args->window);
 164         if (args->window_memory)
 165                 strvec_pushf(&cmd->args, "--window-memory=%s", args->window_memory);
 166         if (args->depth)
 167                 strvec_pushf(&cmd->args, "--depth=%s", args->depth);
 168         if (args->threads)
 169                 strvec_pushf(&cmd->args, "--threads=%s", args->threads);
 170         if (args->max_pack_size)
 171                 strvec_pushf(&cmd->args, "--max-pack-size=%s", args->max_pack_size);
 172         if (args->no_reuse_delta)
 173                 strvec_pushf(&cmd->args, "--no-reuse-delta");
 174         if (args->no_reuse_object)
 175                 strvec_pushf(&cmd->args, "--no-reuse-object");
 176         if (args->local)
 177                 strvec_push(&cmd->args,  "--local");
 178         if (args->quiet)
 179                 strvec_push(&cmd->args,  "--quiet");
 180         if (delta_base_offset)
 181                 strvec_push(&cmd->args,  "--delta-base-offset");
 182         strvec_push(&cmd->args, packtmp);
 183         cmd->git_cmd = 1;
 184         cmd->out = -1;
 185 }
 186
 187 /*
 188  * Write oid to the given struct child_process's stdin, starting it first if
 189  * necessary.
 190  */
 191 static int write_oid(const struct object_id *oid, struct packed_git *pack,
 192                      uint32_t pos, void *data)
 193 {
 194         struct child_process *cmd = data;
 195
 196         if (cmd->in == -1) {
 197                 if (start_command(cmd))
 198                         die(_("could not start pack-objects to repack promisor objects"));
 199         }
 200
 201         xwrite(cmd->in, oid_to_hex(oid), the_hash_algo->hexsz);
 202         xwrite(cmd->in, "\n", 1);
 203         return 0;
 204 }
 205
 206 static struct {
 207         const char *name;
 208         unsigned optional:1;
 209 } exts[] = {
 210         {".pack"},
 211         {".idx"},
 212         {".rev", 1},
 213         {".bitmap", 1},
 214         {".promisor", 1},
 215 };
 216
 217 static unsigned populate_pack_exts(char *name)
 218 {
 219         struct stat statbuf;
 220         struct strbuf path = STRBUF_INIT;
 221         unsigned ret = 0;
 222         int i;
 223
 224         for (i = 0; i < ARRAY_SIZE(exts); i++) {
 225                 strbuf_reset(&path);
 226                 strbuf_addf(&path, "%s-%s%s", packtmp, name, exts[i].name);
 227
 228                 if (stat(path.buf, &statbuf))
 229                         continue;
 230
 231                 ret |= (1 << i);
 232         }
 233
 234         strbuf_release(&path);
 235         return ret;
 236 }
 237
 238 static void repack_promisor_objects(const struct pack_objects_args *args,
 239                                     struct string_list *names)
 240 {
 241         struct child_process cmd = CHILD_PROCESS_INIT;
 242         FILE *out;
 243         struct strbuf line = STRBUF_INIT;
 244
 245         prepare_pack_objects(&cmd, args);
 246         cmd.in = -1;
 247
 248         /*
 249          * NEEDSWORK: Giving pack-objects only the OIDs without any ordering
 250          * hints may result in suboptimal deltas in the resulting pack. See if
 251          * the OIDs can be sent with fake paths such that pack-objects can use a
 252          * {type -> existing pack order} ordering when computing deltas instead
 253          * of a {type -> size} ordering, which may produce better deltas.
 254          */
 255         for_each_packed_object(write_oid, &cmd,
 256                                FOR_EACH_OBJECT_PROMISOR_ONLY);
 257
 258         if (cmd.in == -1)
 259                 /* No packed objects; cmd was never started */
 260                 return;
 261
 262         close(cmd.in);
 263
 264         out = xfdopen(cmd.out, "r");
 265         while (strbuf_getline_lf(&line, out) != EOF) {
 266                 struct string_list_item *item;
 267                 char *promisor_name;
 268
 269                 if (line.len != the_hash_algo->hexsz)
 270                         die(_("repack: Expecting full hex object ID lines only from pack-objects."));
 271                 item = string_list_append(names, line.buf);
 272
 273                 /*
 274                  * pack-objects creates the .pack and .idx files, but not the
 275                  * .promisor file. Create the .promisor file, which is empty.
 276                  *
 277                  * NEEDSWORK: fetch-pack sometimes generates non-empty
 278                  * .promisor files containing the ref names and associated
 279                  * hashes at the point of generation of the corresponding
 280                  * packfile, but this would not preserve their contents. Maybe
 281                  * concatenate the contents of all .promisor files instead of
 282                  * just creating a new empty file.
 283                  */
 284                 promisor_name = mkpathdup("%s-%s.promisor", packtmp,
 285                                           line.buf);
 286                 write_promisor_file(promisor_name, NULL, 0);
 287
 288                 item->util = (void *)(uintptr_t)populate_pack_exts(item->string);
 289
 290                 free(promisor_name);
 291         }
 292         fclose(out);
 293         if (finish_command(&cmd))
 294                 die(_("could not finish pack-objects to repack promisor objects"));
 295 }
 296
 297 #define ALL_INTO_ONE 1
 298 #define LOOSEN_UNREACHABLE 2
 299
 300 struct pack_geometry {
 301         struct packed_git **pack;
 302         uint32_t pack_nr, pack_alloc;
 303         uint32_t split;
 304 };
 305
 306 static uint32_t geometry_pack_weight(struct packed_git *p)
 307 {
 308         if (open_pack_index(p))
 309                 die(_("cannot open index for %s"), p->pack_name);
 310         return p->num_objects;
 311 }
 312
 313 static int geometry_cmp(const void *va, const void *vb)
 314 {
 315         uint32_t aw = geometry_pack_weight(*(struct packed_git **)va),
 316                  bw = geometry_pack_weight(*(struct packed_git **)vb);
 317
 318         if (aw < bw)
 319                 return -1;
 320         if (aw > bw)
 321                 return 1;
 322         return 0;
 323 }
 324
 325 static void init_pack_geometry(struct pack_geometry **geometry_p)
 326 {
 327         struct packed_git *p;
 328         struct pack_geometry *geometry;
 329
 330         *geometry_p = xcalloc(1, sizeof(struct pack_geometry));
 331         geometry = *geometry_p;
 332
 333         for (p = get_all_packs(the_repository); p; p = p->next) {
 334                 if (!pack_kept_objects && p->pack_keep)
 335                         continue;
 336
 337                 ALLOC_GROW(geometry->pack,
 338                            geometry->pack_nr + 1,
 339                            geometry->pack_alloc);
 340
 341                 geometry->pack[geometry->pack_nr] = p;
 342                 geometry->pack_nr++;
 343         }
 344
 345         QSORT(geometry->pack, geometry->pack_nr, geometry_cmp);
 346 }
 347
 348 static void split_pack_geometry(struct pack_geometry *geometry, int factor)
 349 {
 350         uint32_t i;
 351         uint32_t split;
 352         off_t total_size = 0;
 353
 354         if (!geometry->pack_nr) {
 355                 geometry->split = geometry->pack_nr;
 356                 return;
 357         }
 358
 359         /*
 360          * First, count the number of packs (in descending order of size) which
 361          * already form a geometric progression.
 362          */
 363         for (i = geometry->pack_nr - 1; i > 0; i--) {
 364                 struct packed_git *ours = geometry->pack[i];
 365                 struct packed_git *prev = geometry->pack[i - 1];
 366
 367                 if (unsigned_mult_overflows(factor, geometry_pack_weight(prev)))
 368                         die(_("pack %s too large to consider in geometric "
 369                               "progression"),
 370                             prev->pack_name);
 371
 372                 if (geometry_pack_weight(ours) < factor * geometry_pack_weight(prev))
 373                         break;
 374         }
 375
 376         split = i;
 377
 378         if (split) {
 379                 /*
 380                  * Move the split one to the right, since the top element in the
 381                  * last-compared pair can't be in the progression. Only do this
 382                  * when we split in the middle of the array (otherwise if we got
 383                  * to the end, then the split is in the right place).
 384                  */
 385                 split++;
 386         }
 387
 388         /*
 389          * Then, anything to the left of 'split' must be in a new pack. But,
 390          * creating that new pack may cause packs in the heavy half to no longer
 391          * form a geometric progression.
 392          *
 393          * Compute an expected size of the new pack, and then determine how many
 394          * packs in the heavy half need to be joined into it (if any) to restore
 395          * the geometric progression.
 396          */
 397         for (i = 0; i < split; i++) {
 398                 struct packed_git *p = geometry->pack[i];
 399
 400                 if (unsigned_add_overflows(total_size, geometry_pack_weight(p)))
 401                         die(_("pack %s too large to roll up"), p->pack_name);
 402                 total_size += geometry_pack_weight(p);
 403         }
 404         for (i = split; i < geometry->pack_nr; i++) {
 405                 struct packed_git *ours = geometry->pack[i];
 406
 407                 if (unsigned_mult_overflows(factor, total_size))
 408                         die(_("pack %s too large to roll up"), ours->pack_name);
 409
 410                 if (geometry_pack_weight(ours) < factor * total_size) {
 411                         if (unsigned_add_overflows(total_size,
 412                                                    geometry_pack_weight(ours)))
 413                                 die(_("pack %s too large to roll up"),
 414                                     ours->pack_name);
 415
 416                         split++;
 417                         total_size += geometry_pack_weight(ours);
 418                 } else
 419                         break;
 420         }
 421
 422         geometry->split = split;
 423 }
 424
 425 static void clear_pack_geometry(struct pack_geometry *geometry)
 426 {
 427         if (!geometry)
 428                 return;
 429
 430         free(geometry->pack);
 431         geometry->pack_nr = 0;
 432         geometry->pack_alloc = 0;
 433         geometry->split = 0;
 434 }
 435
 436 int cmd_repack(int argc, const char **argv, const char *prefix)
 437 {
 438         struct child_process cmd = CHILD_PROCESS_INIT;
 439         struct string_list_item *item;
 440         struct string_list names = STRING_LIST_INIT_DUP;
 441         struct string_list rollback = STRING_LIST_INIT_NODUP;
 442         struct string_list existing_packs = STRING_LIST_INIT_DUP;
 443         struct pack_geometry *geometry = NULL;
 444         struct strbuf line = STRBUF_INIT;
 445         int i, ext, ret;
 446         FILE *out;
 447
 448         /* variables to be filled by option parsing */
 449         int pack_everything = 0;
 450         int delete_redundant = 0;
 451         const char *unpack_unreachable = NULL;
 452         int keep_unreachable = 0;
 453         struct string_list keep_pack_list = STRING_LIST_INIT_NODUP;
 454         int no_update_server_info = 0;
 455         struct pack_objects_args po_args = {NULL};
 456         int geometric_factor = 0;
 457
 458         struct option builtin_repack_options[] = {
 459                 OPT_BIT('a', NULL, &pack_everything,
 460                                 N_("pack everything in a single pack"), ALL_INTO_ONE),
 461                 OPT_BIT('A', NULL, &pack_everything,
 462                                 N_("same as -a, and turn unreachable objects loose"),
 463                                    LOOSEN_UNREACHABLE | ALL_INTO_ONE),
 464                 OPT_BOOL('d', NULL, &delete_redundant,
 465                                 N_("remove redundant packs, and run git-prune-packed")),
 466                 OPT_BOOL('f', NULL, &po_args.no_reuse_delta,
 467                                 N_("pass --no-reuse-delta to git-pack-objects")),
 468                 OPT_BOOL('F', NULL, &po_args.no_reuse_object,
 469                                 N_("pass --no-reuse-object to git-pack-objects")),
 470                 OPT_BOOL('n', NULL, &no_update_server_info,
 471                                 N_("do not run git-update-server-info")),
 472                 OPT__QUIET(&po_args.quiet, N_("be quiet")),
 473                 OPT_BOOL('l', "local", &po_args.local,
 474                                 N_("pass --local to git-pack-objects")),
 475                 OPT_BOOL('b', "write-bitmap-index", &write_bitmaps,
 476                                 N_("write bitmap index")),
 477                 OPT_BOOL('i', "delta-islands", &use_delta_islands,
 478                                 N_("pass --delta-islands to git-pack-objects")),
 479                 OPT_STRING(0, "unpack-unreachable", &unpack_unreachable, N_("approxidate"),
 480                                 N_("with -A, do not loosen objects older than this")),
 481                 OPT_BOOL('k', "keep-unreachable", &keep_unreachable,
 482                                 N_("with -a, repack unreachable objects")),
 483                 OPT_STRING(0, "window", &po_args.window, N_("n"),
 484                                 N_("size of the window used for delta compression")),
 485                 OPT_STRING(0, "window-memory", &po_args.window_memory, N_("bytes"),
 486                                 N_("same as the above, but limit memory size instead of entries count")),
 487                 OPT_STRING(0, "depth", &po_args.depth, N_("n"),
 488                                 N_("limits the maximum delta depth")),
 489                 OPT_STRING(0, "threads", &po_args.threads, N_("n"),
 490                                 N_("limits the maximum number of threads")),
 491                 OPT_STRING(0, "max-pack-size", &po_args.max_pack_size, N_("bytes"),
 492                                 N_("maximum size of each packfile")),
 493                 OPT_BOOL(0, "pack-kept-objects", &pack_kept_objects,
 494                                 N_("repack objects in packs marked with .keep")),
 495                 OPT_STRING_LIST(0, "keep-pack", &keep_pack_list, N_("name"),
 496                                 N_("do not repack this pack")),
 497                 OPT_INTEGER('g', "geometric", &geometric_factor,
 498                             N_("find a geometric progression with factor <N>")),
 499                 OPT_END()
 500         };
 501
 502         git_config(repack_config, NULL);
 503
 504         argc = parse_options(argc, argv, prefix, builtin_repack_options,
 505                                 git_repack_usage, 0);
 506
 507         if (delete_redundant && repository_format_precious_objects)
 508                 die(_("cannot delete packs in a precious-objects repo"));
 509
 510         if (keep_unreachable &&
 511             (unpack_unreachable || (pack_everything & LOOSEN_UNREACHABLE)))
 512                 die(_("--keep-unreachable and -A are incompatible"));
 513
 514         if (write_bitmaps < 0) {
 515                 if (!(pack_everything & ALL_INTO_ONE) ||
 516                     !is_bare_repository())
 517                         write_bitmaps = 0;
 518         }
 519         if (pack_kept_objects < 0)
 520                 pack_kept_objects = write_bitmaps > 0;
 521
 522         if (write_bitmaps && !(pack_everything & ALL_INTO_ONE))
 523                 die(_(incremental_bitmap_conflict_error));
 524
 525         if (geometric_factor) {
 526                 if (pack_everything)
 527                         die(_("--geometric is incompatible with -A, -a"));
 528                 init_pack_geometry(&geometry);
 529                 split_pack_geometry(geometry, geometric_factor);
 530         }
 531
 532         packdir = mkpathdup("%s/pack", get_object_directory());
 533         packtmp_name = xstrfmt(".tmp-%d-pack", (int)getpid());
 534         packtmp = mkpathdup("%s/%s", packdir, packtmp_name);
 535
 536         sigchain_push_common(remove_pack_on_signal);
 537
 538         prepare_pack_objects(&cmd, &po_args);
 539
 540         strvec_push(&cmd.args, "--keep-true-parents");
 541         if (!pack_kept_objects)
 542                 strvec_push(&cmd.args, "--honor-pack-keep");
 543         for (i = 0; i < keep_pack_list.nr; i++)
 544                 strvec_pushf(&cmd.args, "--keep-pack=%s",
 545                              keep_pack_list.items[i].string);
 546         strvec_push(&cmd.args, "--non-empty");
 547         if (!geometry) {
 548                 /*
 549                  * We need to grab all reachable objects, including those that
 550                  * are reachable from reflogs and the index.
 551                  *
 552                  * When repacking into a geometric progression of packs,
 553                  * however, we ask 'git pack-objects --stdin-packs', and it is
 554                  * not about packing objects based on reachability but about
 555                  * repacking all the objects in specified packs and loose ones
 556                  * (indeed, --stdin-packs is incompatible with these options).
 557                  */
 558                 strvec_push(&cmd.args, "--all");
 559                 strvec_push(&cmd.args, "--reflog");
 560                 strvec_push(&cmd.args, "--indexed-objects");
 561         }
 562         if (has_promisor_remote())
 563                 strvec_push(&cmd.args, "--exclude-promisor-objects");
 564         if (write_bitmaps > 0)
 565                 strvec_push(&cmd.args, "--write-bitmap-index");
 566         else if (write_bitmaps < 0)
 567                 strvec_push(&cmd.args, "--write-bitmap-index-quiet");
 568         if (use_delta_islands)
 569                 strvec_push(&cmd.args, "--delta-islands");
 570
 571         if (pack_everything & ALL_INTO_ONE) {
 572                 get_non_kept_pack_filenames(&existing_packs, &keep_pack_list);
 573
 574                 repack_promisor_objects(&po_args, &names);
 575
 576                 if (existing_packs.nr && delete_redundant) {
 577                         for_each_string_list_item(item, &names) {
 578                                 strvec_pushf(&cmd.args, "--keep-pack=%s-%s.pack",
 579                                              packtmp_name, item->string);
 580                         }
 581                         if (unpack_unreachable) {
 582                                 strvec_pushf(&cmd.args,
 583                                              "--unpack-unreachable=%s",
 584                                              unpack_unreachable);
 585                                 strvec_push(&cmd.env_array, "GIT_REF_PARANOIA=1");
 586                         } else if (pack_everything & LOOSEN_UNREACHABLE) {
 587                                 strvec_push(&cmd.args,
 588                                             "--unpack-unreachable");
 589                         } else if (keep_unreachable) {
 590                                 strvec_push(&cmd.args, "--keep-unreachable");
 591                                 strvec_push(&cmd.args, "--pack-loose-unreachable");
 592                         } else {
 593                                 strvec_push(&cmd.env_array, "GIT_REF_PARANOIA=1");
 594                         }
 595                 }
 596         } else if (geometry) {
 597                 strvec_push(&cmd.args, "--stdin-packs");
 598                 strvec_push(&cmd.args, "--unpacked");
 599         } else {
 600                 strvec_push(&cmd.args, "--unpacked");
 601                 strvec_push(&cmd.args, "--incremental");
 602         }
 603
 604         if (geometry)
 605                 cmd.in = -1;
 606         else
 607                 cmd.no_stdin = 1;
 608
 609         ret = start_command(&cmd);
 610         if (ret)
 611                 return ret;
 612
 613         if (geometry) {
 614                 FILE *in = xfdopen(cmd.in, "w");
 615                 /*
 616                  * The resulting pack should contain all objects in packs that
 617                  * are going to be rolled up, but exclude objects in packs which
 618                  * are being left alone.
 619                  */
 620                 for (i = 0; i < geometry->split; i++)
 621                         fprintf(in, "%s\n", pack_basename(geometry->pack[i]));
 622                 for (i = geometry->split; i < geometry->pack_nr; i++)
 623                         fprintf(in, "^%s\n", pack_basename(geometry->pack[i]));
 624                 fclose(in);
 625         }
 626
 627         out = xfdopen(cmd.out, "r");
 628         while (strbuf_getline_lf(&line, out) != EOF) {
 629                 if (line.len != the_hash_algo->hexsz)
 630                         die(_("repack: Expecting full hex object ID lines only from pack-objects."));
 631                 string_list_append(&names, line.buf);
 632         }
 633         fclose(out);
 634         ret = finish_command(&cmd);
 635         if (ret)
 636                 return ret;
 637
 638         if (!names.nr && !po_args.quiet)
 639                 printf_ln(_("Nothing new to pack."));
 640
 641         for_each_string_list_item(item, &names) {
 642                 item->util = (void *)(uintptr_t)populate_pack_exts(item->string);
 643         }
 644
 645         close_object_store(the_repository->objects);
 646
 647         /*
 648          * Ok we have prepared all new packfiles.
 649          */
 650         for_each_string_list_item(item, &names) {
 651                 for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
 652                         char *fname, *fname_old;
 653
 654                         fname = mkpathdup("%s/pack-%s%s",
 655                                         packdir, item->string, exts[ext].name);
 656                         fname_old = mkpathdup("%s-%s%s",
 657                                         packtmp, item->string, exts[ext].name);
 658
 659                         if (((uintptr_t)item->util) & (1 << ext)) {
 660                                 struct stat statbuffer;
 661                                 if (!stat(fname_old, &statbuffer)) {
 662                                         statbuffer.st_mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH);
 663                                         chmod(fname_old, statbuffer.st_mode);
 664                                 }
 665
 666                                 if (rename(fname_old, fname))
 667                                         die_errno(_("renaming '%s' failed"), fname_old);
 668                         } else if (!exts[ext].optional)
 669                                 die(_("missing required file: %s"), fname_old);
 670                         else if (unlink(fname) < 0 && errno != ENOENT)
 671                                 die_errno(_("could not unlink: %s"), fname);
 672
 673                         free(fname);
 674                         free(fname_old);
 675                 }
 676         }
 677         /* End of pack replacement. */
 678
 679         reprepare_packed_git(the_repository);
 680
 681         if (delete_redundant) {
 682                 const int hexsz = the_hash_algo->hexsz;
 683                 int opts = 0;
 684                 string_list_sort(&names);
 685                 for_each_string_list_item(item, &existing_packs) {
 686                         char *sha1;
 687                         size_t len = strlen(item->string);
 688                         if (len < hexsz)
 689                                 continue;
 690                         sha1 = item->string + len - hexsz;
 691                         if (!string_list_has_string(&names, sha1))
 692                                 remove_redundant_pack(packdir, item->string);
 693                 }
 694
 695                 if (geometry) {
 696                         struct strbuf buf = STRBUF_INIT;
 697
 698                         uint32_t i;
 699                         for (i = 0; i < geometry->split; i++) {
 700                                 struct packed_git *p = geometry->pack[i];
 701                                 if (string_list_has_string(&names,
 702                                                            hash_to_hex(p->hash)))
 703                                         continue;
 704
 705                                 strbuf_reset(&buf);
 706                                 strbuf_addstr(&buf, pack_basename(p));
 707                                 strbuf_strip_suffix(&buf, ".pack");
 708
 709                                 remove_redundant_pack(packdir, buf.buf);
 710                         }
 711                         strbuf_release(&buf);
 712                 }
 713                 if (!po_args.quiet && isatty(2))
 714                         opts |= PRUNE_PACKED_VERBOSE;
 715                 prune_packed_objects(opts);
 716
 717                 if (!keep_unreachable &&
 718                     (!(pack_everything & LOOSEN_UNREACHABLE) ||
 719                      unpack_unreachable) &&
 720                     is_repository_shallow(the_repository))
 721                         prune_shallow(PRUNE_QUICK);
 722         }
 723
 724         if (!no_update_server_info)
 725                 update_server_info(0);
 726         remove_temporary_files();
 727
 728         if (git_env_bool(GIT_TEST_MULTI_PACK_INDEX, 0))
 729                 write_midx_file(get_object_directory(), NULL, 0);
 730
 731         string_list_clear(&names, 0);
 732         string_list_clear(&rollback, 0);
 733         string_list_clear(&existing_packs, 0);
 734         clear_pack_geometry(geometry);
 735         strbuf_release(&line);
 736
 737         return 0;
 738 }