builtin / index-pack.con commit Merge branch 'jk/maint-null-in-trees' into maint-1.7.11 (03adeea)
   1#include "builtin.h"
   2#include "delta.h"
   3#include "pack.h"
   4#include "csum-file.h"
   5#include "blob.h"
   6#include "commit.h"
   7#include "tag.h"
   8#include "tree.h"
   9#include "progress.h"
  10#include "fsck.h"
  11#include "exec_cmd.h"
  12#include "thread-utils.h"
  13
  14static const char index_pack_usage[] =
  15"git index-pack [-v] [-o <index-file>] [--keep | --keep=<msg>] [--verify] [--strict] (<pack-file> | --stdin [--fix-thin] [<pack-file>])";
  16
  17struct object_entry {
  18        struct pack_idx_entry idx;
  19        unsigned long size;
  20        unsigned int hdr_size;
  21        enum object_type type;
  22        enum object_type real_type;
  23        unsigned delta_depth;
  24        int base_object_no;
  25};
  26
  27union delta_base {
  28        unsigned char sha1[20];
  29        off_t offset;
  30};
  31
  32struct base_data {
  33        struct base_data *base;
  34        struct base_data *child;
  35        struct object_entry *obj;
  36        void *data;
  37        unsigned long size;
  38        int ref_first, ref_last;
  39        int ofs_first, ofs_last;
  40};
  41
  42#if !defined(NO_PTHREADS) && defined(NO_THREAD_SAFE_PREAD)
  43/* pread() emulation is not thread-safe. Disable threading. */
  44#define NO_PTHREADS
  45#endif
  46
  47struct thread_local {
  48#ifndef NO_PTHREADS
  49        pthread_t thread;
  50#endif
  51        struct base_data *base_cache;
  52        size_t base_cache_used;
  53};
  54
  55/*
  56 * Even if sizeof(union delta_base) == 24 on 64-bit archs, we really want
  57 * to memcmp() only the first 20 bytes.
  58 */
  59#define UNION_BASE_SZ   20
  60
  61#define FLAG_LINK (1u<<20)
  62#define FLAG_CHECKED (1u<<21)
  63
  64struct delta_entry {
  65        union delta_base base;
  66        int obj_no;
  67};
  68
  69static struct object_entry *objects;
  70static struct delta_entry *deltas;
  71static struct thread_local nothread_data;
  72static int nr_objects;
  73static int nr_deltas;
  74static int nr_resolved_deltas;
  75static int nr_threads;
  76
  77static int from_stdin;
  78static int strict;
  79static int verbose;
  80
  81static struct progress *progress;
  82
  83/* We always read in 4kB chunks. */
  84static unsigned char input_buffer[4096];
  85static unsigned int input_offset, input_len;
  86static off_t consumed_bytes;
  87static unsigned deepest_delta;
  88static git_SHA_CTX input_ctx;
  89static uint32_t input_crc32;
  90static int input_fd, output_fd, pack_fd;
  91
  92#ifndef NO_PTHREADS
  93
  94static struct thread_local *thread_data;
  95static int nr_dispatched;
  96static int threads_active;
  97
  98static pthread_mutex_t read_mutex;
  99#define read_lock()             lock_mutex(&read_mutex)
 100#define read_unlock()           unlock_mutex(&read_mutex)
 101
 102static pthread_mutex_t counter_mutex;
 103#define counter_lock()          lock_mutex(&counter_mutex)
 104#define counter_unlock()        unlock_mutex(&counter_mutex)
 105
 106static pthread_mutex_t work_mutex;
 107#define work_lock()             lock_mutex(&work_mutex)
 108#define work_unlock()           unlock_mutex(&work_mutex)
 109
 110static pthread_key_t key;
 111
 112static inline void lock_mutex(pthread_mutex_t *mutex)
 113{
 114        if (threads_active)
 115                pthread_mutex_lock(mutex);
 116}
 117
 118static inline void unlock_mutex(pthread_mutex_t *mutex)
 119{
 120        if (threads_active)
 121                pthread_mutex_unlock(mutex);
 122}
 123
 124/*
 125 * Mutex and conditional variable can't be statically-initialized on Windows.
 126 */
 127static void init_thread(void)
 128{
 129        init_recursive_mutex(&read_mutex);
 130        pthread_mutex_init(&counter_mutex, NULL);
 131        pthread_mutex_init(&work_mutex, NULL);
 132        pthread_key_create(&key, NULL);
 133        thread_data = xcalloc(nr_threads, sizeof(*thread_data));
 134        threads_active = 1;
 135}
 136
 137static void cleanup_thread(void)
 138{
 139        if (!threads_active)
 140                return;
 141        threads_active = 0;
 142        pthread_mutex_destroy(&read_mutex);
 143        pthread_mutex_destroy(&counter_mutex);
 144        pthread_mutex_destroy(&work_mutex);
 145        pthread_key_delete(key);
 146        free(thread_data);
 147}
 148
 149#else
 150
 151#define read_lock()
 152#define read_unlock()
 153
 154#define counter_lock()
 155#define counter_unlock()
 156
 157#define work_lock()
 158#define work_unlock()
 159
 160#endif
 161
 162
 163static int mark_link(struct object *obj, int type, void *data)
 164{
 165        if (!obj)
 166                return -1;
 167
 168        if (type != OBJ_ANY && obj->type != type)
 169                die(_("object type mismatch at %s"), sha1_to_hex(obj->sha1));
 170
 171        obj->flags |= FLAG_LINK;
 172        return 0;
 173}
 174
 175/* The content of each linked object must have been checked
 176   or it must be already present in the object database */
 177static void check_object(struct object *obj)
 178{
 179        if (!obj)
 180                return;
 181
 182        if (!(obj->flags & FLAG_LINK))
 183                return;
 184
 185        if (!(obj->flags & FLAG_CHECKED)) {
 186                unsigned long size;
 187                int type = sha1_object_info(obj->sha1, &size);
 188                if (type != obj->type || type <= 0)
 189                        die(_("object of unexpected type"));
 190                obj->flags |= FLAG_CHECKED;
 191                return;
 192        }
 193}
 194
 195static void check_objects(void)
 196{
 197        unsigned i, max;
 198
 199        max = get_max_object_index();
 200        for (i = 0; i < max; i++)
 201                check_object(get_indexed_object(i));
 202}
 203
 204
 205/* Discard current buffer used content. */
 206static void flush(void)
 207{
 208        if (input_offset) {
 209                if (output_fd >= 0)
 210                        write_or_die(output_fd, input_buffer, input_offset);
 211                git_SHA1_Update(&input_ctx, input_buffer, input_offset);
 212                memmove(input_buffer, input_buffer + input_offset, input_len);
 213                input_offset = 0;
 214        }
 215}
 216
 217/*
 218 * Make sure at least "min" bytes are available in the buffer, and
 219 * return the pointer to the buffer.
 220 */
 221static void *fill(int min)
 222{
 223        if (min <= input_len)
 224                return input_buffer + input_offset;
 225        if (min > sizeof(input_buffer))
 226                die(Q_("cannot fill %d byte",
 227                       "cannot fill %d bytes",
 228                       min),
 229                    min);
 230        flush();
 231        do {
 232                ssize_t ret = xread(input_fd, input_buffer + input_len,
 233                                sizeof(input_buffer) - input_len);
 234                if (ret <= 0) {
 235                        if (!ret)
 236                                die(_("early EOF"));
 237                        die_errno(_("read error on input"));
 238                }
 239                input_len += ret;
 240                if (from_stdin)
 241                        display_throughput(progress, consumed_bytes + input_len);
 242        } while (input_len < min);
 243        return input_buffer;
 244}
 245
 246static void use(int bytes)
 247{
 248        if (bytes > input_len)
 249                die(_("used more bytes than were available"));
 250        input_crc32 = crc32(input_crc32, input_buffer + input_offset, bytes);
 251        input_len -= bytes;
 252        input_offset += bytes;
 253
 254        /* make sure off_t is sufficiently large not to wrap */
 255        if (signed_add_overflows(consumed_bytes, bytes))
 256                die(_("pack too large for current definition of off_t"));
 257        consumed_bytes += bytes;
 258}
 259
 260static const char *open_pack_file(const char *pack_name)
 261{
 262        if (from_stdin) {
 263                input_fd = 0;
 264                if (!pack_name) {
 265                        static char tmp_file[PATH_MAX];
 266                        output_fd = odb_mkstemp(tmp_file, sizeof(tmp_file),
 267                                                "pack/tmp_pack_XXXXXX");
 268                        pack_name = xstrdup(tmp_file);
 269                } else
 270                        output_fd = open(pack_name, O_CREAT|O_EXCL|O_RDWR, 0600);
 271                if (output_fd < 0)
 272                        die_errno(_("unable to create '%s'"), pack_name);
 273                pack_fd = output_fd;
 274        } else {
 275                input_fd = open(pack_name, O_RDONLY);
 276                if (input_fd < 0)
 277                        die_errno(_("cannot open packfile '%s'"), pack_name);
 278                output_fd = -1;
 279                pack_fd = input_fd;
 280        }
 281        git_SHA1_Init(&input_ctx);
 282        return pack_name;
 283}
 284
 285static void parse_pack_header(void)
 286{
 287        struct pack_header *hdr = fill(sizeof(struct pack_header));
 288
 289        /* Header consistency check */
 290        if (hdr->hdr_signature != htonl(PACK_SIGNATURE))
 291                die(_("pack signature mismatch"));
 292        if (!pack_version_ok(hdr->hdr_version))
 293                die("pack version %"PRIu32" unsupported",
 294                        ntohl(hdr->hdr_version));
 295
 296        nr_objects = ntohl(hdr->hdr_entries);
 297        use(sizeof(struct pack_header));
 298}
 299
 300static NORETURN void bad_object(unsigned long offset, const char *format,
 301                       ...) __attribute__((format (printf, 2, 3)));
 302
 303static NORETURN void bad_object(unsigned long offset, const char *format, ...)
 304{
 305        va_list params;
 306        char buf[1024];
 307
 308        va_start(params, format);
 309        vsnprintf(buf, sizeof(buf), format, params);
 310        va_end(params);
 311        die(_("pack has bad object at offset %lu: %s"), offset, buf);
 312}
 313
 314static inline struct thread_local *get_thread_data(void)
 315{
 316#ifndef NO_PTHREADS
 317        if (threads_active)
 318                return pthread_getspecific(key);
 319        assert(!threads_active &&
 320               "This should only be reached when all threads are gone");
 321#endif
 322        return &nothread_data;
 323}
 324
 325#ifndef NO_PTHREADS
 326static void set_thread_data(struct thread_local *data)
 327{
 328        if (threads_active)
 329                pthread_setspecific(key, data);
 330}
 331#endif
 332
 333static struct base_data *alloc_base_data(void)
 334{
 335        struct base_data *base = xmalloc(sizeof(struct base_data));
 336        memset(base, 0, sizeof(*base));
 337        base->ref_last = -1;
 338        base->ofs_last = -1;
 339        return base;
 340}
 341
 342static void free_base_data(struct base_data *c)
 343{
 344        if (c->data) {
 345                free(c->data);
 346                c->data = NULL;
 347                get_thread_data()->base_cache_used -= c->size;
 348        }
 349}
 350
 351static void prune_base_data(struct base_data *retain)
 352{
 353        struct base_data *b;
 354        struct thread_local *data = get_thread_data();
 355        for (b = data->base_cache;
 356             data->base_cache_used > delta_base_cache_limit && b;
 357             b = b->child) {
 358                if (b->data && b != retain)
 359                        free_base_data(b);
 360        }
 361}
 362
 363static void link_base_data(struct base_data *base, struct base_data *c)
 364{
 365        if (base)
 366                base->child = c;
 367        else
 368                get_thread_data()->base_cache = c;
 369
 370        c->base = base;
 371        c->child = NULL;
 372        if (c->data)
 373                get_thread_data()->base_cache_used += c->size;
 374        prune_base_data(c);
 375}
 376
 377static void unlink_base_data(struct base_data *c)
 378{
 379        struct base_data *base = c->base;
 380        if (base)
 381                base->child = NULL;
 382        else
 383                get_thread_data()->base_cache = NULL;
 384        free_base_data(c);
 385}
 386
 387static void *unpack_entry_data(unsigned long offset, unsigned long size)
 388{
 389        int status;
 390        git_zstream stream;
 391        void *buf = xmalloc(size);
 392
 393        memset(&stream, 0, sizeof(stream));
 394        git_inflate_init(&stream);
 395        stream.next_out = buf;
 396        stream.avail_out = size;
 397
 398        do {
 399                stream.next_in = fill(1);
 400                stream.avail_in = input_len;
 401                status = git_inflate(&stream, 0);
 402                use(input_len - stream.avail_in);
 403        } while (status == Z_OK);
 404        if (stream.total_out != size || status != Z_STREAM_END)
 405                bad_object(offset, _("inflate returned %d"), status);
 406        git_inflate_end(&stream);
 407        return buf;
 408}
 409
 410static void *unpack_raw_entry(struct object_entry *obj, union delta_base *delta_base)
 411{
 412        unsigned char *p;
 413        unsigned long size, c;
 414        off_t base_offset;
 415        unsigned shift;
 416        void *data;
 417
 418        obj->idx.offset = consumed_bytes;
 419        input_crc32 = crc32(0, NULL, 0);
 420
 421        p = fill(1);
 422        c = *p;
 423        use(1);
 424        obj->type = (c >> 4) & 7;
 425        size = (c & 15);
 426        shift = 4;
 427        while (c & 0x80) {
 428                p = fill(1);
 429                c = *p;
 430                use(1);
 431                size += (c & 0x7f) << shift;
 432                shift += 7;
 433        }
 434        obj->size = size;
 435
 436        switch (obj->type) {
 437        case OBJ_REF_DELTA:
 438                hashcpy(delta_base->sha1, fill(20));
 439                use(20);
 440                break;
 441        case OBJ_OFS_DELTA:
 442                memset(delta_base, 0, sizeof(*delta_base));
 443                p = fill(1);
 444                c = *p;
 445                use(1);
 446                base_offset = c & 127;
 447                while (c & 128) {
 448                        base_offset += 1;
 449                        if (!base_offset || MSB(base_offset, 7))
 450                                bad_object(obj->idx.offset, _("offset value overflow for delta base object"));
 451                        p = fill(1);
 452                        c = *p;
 453                        use(1);
 454                        base_offset = (base_offset << 7) + (c & 127);
 455                }
 456                delta_base->offset = obj->idx.offset - base_offset;
 457                if (delta_base->offset <= 0 || delta_base->offset >= obj->idx.offset)
 458                        bad_object(obj->idx.offset, _("delta base offset is out of bound"));
 459                break;
 460        case OBJ_COMMIT:
 461        case OBJ_TREE:
 462        case OBJ_BLOB:
 463        case OBJ_TAG:
 464                break;
 465        default:
 466                bad_object(obj->idx.offset, _("unknown object type %d"), obj->type);
 467        }
 468        obj->hdr_size = consumed_bytes - obj->idx.offset;
 469
 470        data = unpack_entry_data(obj->idx.offset, obj->size);
 471        obj->idx.crc32 = input_crc32;
 472        return data;
 473}
 474
 475static void *get_data_from_pack(struct object_entry *obj)
 476{
 477        off_t from = obj[0].idx.offset + obj[0].hdr_size;
 478        unsigned long len = obj[1].idx.offset - from;
 479        unsigned char *data, *inbuf;
 480        git_zstream stream;
 481        int status;
 482
 483        data = xmalloc(obj->size);
 484        inbuf = xmalloc((len < 64*1024) ? len : 64*1024);
 485
 486        memset(&stream, 0, sizeof(stream));
 487        git_inflate_init(&stream);
 488        stream.next_out = data;
 489        stream.avail_out = obj->size;
 490
 491        do {
 492                ssize_t n = (len < 64*1024) ? len : 64*1024;
 493                n = pread(pack_fd, inbuf, n, from);
 494                if (n < 0)
 495                        die_errno(_("cannot pread pack file"));
 496                if (!n)
 497                        die(Q_("premature end of pack file, %lu byte missing",
 498                               "premature end of pack file, %lu bytes missing",
 499                               len),
 500                            len);
 501                from += n;
 502                len -= n;
 503                stream.next_in = inbuf;
 504                stream.avail_in = n;
 505                status = git_inflate(&stream, 0);
 506        } while (len && status == Z_OK && !stream.avail_in);
 507
 508        /* This has been inflated OK when first encountered, so... */
 509        if (status != Z_STREAM_END || stream.total_out != obj->size)
 510                die(_("serious inflate inconsistency"));
 511
 512        git_inflate_end(&stream);
 513        free(inbuf);
 514        return data;
 515}
 516
 517static int compare_delta_bases(const union delta_base *base1,
 518                               const union delta_base *base2,
 519                               enum object_type type1,
 520                               enum object_type type2)
 521{
 522        int cmp = type1 - type2;
 523        if (cmp)
 524                return cmp;
 525        return memcmp(base1, base2, UNION_BASE_SZ);
 526}
 527
 528static int find_delta(const union delta_base *base, enum object_type type)
 529{
 530        int first = 0, last = nr_deltas;
 531
 532        while (first < last) {
 533                int next = (first + last) / 2;
 534                struct delta_entry *delta = &deltas[next];
 535                int cmp;
 536
 537                cmp = compare_delta_bases(base, &delta->base,
 538                                          type, objects[delta->obj_no].type);
 539                if (!cmp)
 540                        return next;
 541                if (cmp < 0) {
 542                        last = next;
 543                        continue;
 544                }
 545                first = next+1;
 546        }
 547        return -first-1;
 548}
 549
 550static void find_delta_children(const union delta_base *base,
 551                                int *first_index, int *last_index,
 552                                enum object_type type)
 553{
 554        int first = find_delta(base, type);
 555        int last = first;
 556        int end = nr_deltas - 1;
 557
 558        if (first < 0) {
 559                *first_index = 0;
 560                *last_index = -1;
 561                return;
 562        }
 563        while (first > 0 && !memcmp(&deltas[first - 1].base, base, UNION_BASE_SZ))
 564                --first;
 565        while (last < end && !memcmp(&deltas[last + 1].base, base, UNION_BASE_SZ))
 566                ++last;
 567        *first_index = first;
 568        *last_index = last;
 569}
 570
 571static void sha1_object(const void *data, unsigned long size,
 572                        enum object_type type, unsigned char *sha1)
 573{
 574        hash_sha1_file(data, size, typename(type), sha1);
 575        read_lock();
 576        if (has_sha1_file(sha1)) {
 577                void *has_data;
 578                enum object_type has_type;
 579                unsigned long has_size;
 580                has_data = read_sha1_file(sha1, &has_type, &has_size);
 581                read_unlock();
 582                if (!has_data)
 583                        die(_("cannot read existing object %s"), sha1_to_hex(sha1));
 584                if (size != has_size || type != has_type ||
 585                    memcmp(data, has_data, size) != 0)
 586                        die(_("SHA1 COLLISION FOUND WITH %s !"), sha1_to_hex(sha1));
 587                free(has_data);
 588        } else
 589                read_unlock();
 590
 591        if (strict) {
 592                read_lock();
 593                if (type == OBJ_BLOB) {
 594                        struct blob *blob = lookup_blob(sha1);
 595                        if (blob)
 596                                blob->object.flags |= FLAG_CHECKED;
 597                        else
 598                                die(_("invalid blob object %s"), sha1_to_hex(sha1));
 599                } else {
 600                        struct object *obj;
 601                        int eaten;
 602                        void *buf = (void *) data;
 603
 604                        /*
 605                         * we do not need to free the memory here, as the
 606                         * buf is deleted by the caller.
 607                         */
 608                        obj = parse_object_buffer(sha1, type, size, buf, &eaten);
 609                        if (!obj)
 610                                die(_("invalid %s"), typename(type));
 611                        if (fsck_object(obj, 1, fsck_error_function))
 612                                die(_("Error in object"));
 613                        if (fsck_walk(obj, mark_link, NULL))
 614                                die(_("Not all child objects of %s are reachable"), sha1_to_hex(obj->sha1));
 615
 616                        if (obj->type == OBJ_TREE) {
 617                                struct tree *item = (struct tree *) obj;
 618                                item->buffer = NULL;
 619                        }
 620                        if (obj->type == OBJ_COMMIT) {
 621                                struct commit *commit = (struct commit *) obj;
 622                                commit->buffer = NULL;
 623                        }
 624                        obj->flags |= FLAG_CHECKED;
 625                }
 626                read_unlock();
 627        }
 628}
 629
 630static int is_delta_type(enum object_type type)
 631{
 632        return (type == OBJ_REF_DELTA || type == OBJ_OFS_DELTA);
 633}
 634
 635/*
 636 * This function is part of find_unresolved_deltas(). There are two
 637 * walkers going in the opposite ways.
 638 *
 639 * The first one in find_unresolved_deltas() traverses down from
 640 * parent node to children, deflating nodes along the way. However,
 641 * memory for deflated nodes is limited by delta_base_cache_limit, so
 642 * at some point parent node's deflated content may be freed.
 643 *
 644 * The second walker is this function, which goes from current node up
 645 * to top parent if necessary to deflate the node. In normal
 646 * situation, its parent node would be already deflated, so it just
 647 * needs to apply delta.
 648 *
 649 * In the worst case scenario, parent node is no longer deflated because
 650 * we're running out of delta_base_cache_limit; we need to re-deflate
 651 * parents, possibly up to the top base.
 652 *
 653 * All deflated objects here are subject to be freed if we exceed
 654 * delta_base_cache_limit, just like in find_unresolved_deltas(), we
 655 * just need to make sure the last node is not freed.
 656 */
 657static void *get_base_data(struct base_data *c)
 658{
 659        if (!c->data) {
 660                struct object_entry *obj = c->obj;
 661                struct base_data **delta = NULL;
 662                int delta_nr = 0, delta_alloc = 0;
 663
 664                while (is_delta_type(c->obj->type) && !c->data) {
 665                        ALLOC_GROW(delta, delta_nr + 1, delta_alloc);
 666                        delta[delta_nr++] = c;
 667                        c = c->base;
 668                }
 669                if (!delta_nr) {
 670                        c->data = get_data_from_pack(obj);
 671                        c->size = obj->size;
 672                        get_thread_data()->base_cache_used += c->size;
 673                        prune_base_data(c);
 674                }
 675                for (; delta_nr > 0; delta_nr--) {
 676                        void *base, *raw;
 677                        c = delta[delta_nr - 1];
 678                        obj = c->obj;
 679                        base = get_base_data(c->base);
 680                        raw = get_data_from_pack(obj);
 681                        c->data = patch_delta(
 682                                base, c->base->size,
 683                                raw, obj->size,
 684                                &c->size);
 685                        free(raw);
 686                        if (!c->data)
 687                                bad_object(obj->idx.offset, _("failed to apply delta"));
 688                        get_thread_data()->base_cache_used += c->size;
 689                        prune_base_data(c);
 690                }
 691                free(delta);
 692        }
 693        return c->data;
 694}
 695
 696static void resolve_delta(struct object_entry *delta_obj,
 697                          struct base_data *base, struct base_data *result)
 698{
 699        void *base_data, *delta_data;
 700
 701        delta_obj->real_type = base->obj->real_type;
 702        delta_obj->delta_depth = base->obj->delta_depth + 1;
 703        if (deepest_delta < delta_obj->delta_depth)
 704                deepest_delta = delta_obj->delta_depth;
 705        delta_obj->base_object_no = base->obj - objects;
 706        delta_data = get_data_from_pack(delta_obj);
 707        base_data = get_base_data(base);
 708        result->obj = delta_obj;
 709        result->data = patch_delta(base_data, base->size,
 710                                   delta_data, delta_obj->size, &result->size);
 711        free(delta_data);
 712        if (!result->data)
 713                bad_object(delta_obj->idx.offset, _("failed to apply delta"));
 714        sha1_object(result->data, result->size, delta_obj->real_type,
 715                    delta_obj->idx.sha1);
 716        counter_lock();
 717        nr_resolved_deltas++;
 718        counter_unlock();
 719}
 720
 721static struct base_data *find_unresolved_deltas_1(struct base_data *base,
 722                                                  struct base_data *prev_base)
 723{
 724        if (base->ref_last == -1 && base->ofs_last == -1) {
 725                union delta_base base_spec;
 726
 727                hashcpy(base_spec.sha1, base->obj->idx.sha1);
 728                find_delta_children(&base_spec,
 729                                    &base->ref_first, &base->ref_last, OBJ_REF_DELTA);
 730
 731                memset(&base_spec, 0, sizeof(base_spec));
 732                base_spec.offset = base->obj->idx.offset;
 733                find_delta_children(&base_spec,
 734                                    &base->ofs_first, &base->ofs_last, OBJ_OFS_DELTA);
 735
 736                if (base->ref_last == -1 && base->ofs_last == -1) {
 737                        free(base->data);
 738                        return NULL;
 739                }
 740
 741                link_base_data(prev_base, base);
 742        }
 743
 744        if (base->ref_first <= base->ref_last) {
 745                struct object_entry *child = objects + deltas[base->ref_first].obj_no;
 746                struct base_data *result = alloc_base_data();
 747
 748                assert(child->real_type == OBJ_REF_DELTA);
 749                resolve_delta(child, base, result);
 750                if (base->ref_first == base->ref_last && base->ofs_last == -1)
 751                        free_base_data(base);
 752
 753                base->ref_first++;
 754                return result;
 755        }
 756
 757        if (base->ofs_first <= base->ofs_last) {
 758                struct object_entry *child = objects + deltas[base->ofs_first].obj_no;
 759                struct base_data *result = alloc_base_data();
 760
 761                assert(child->real_type == OBJ_OFS_DELTA);
 762                resolve_delta(child, base, result);
 763                if (base->ofs_first == base->ofs_last)
 764                        free_base_data(base);
 765
 766                base->ofs_first++;
 767                return result;
 768        }
 769
 770        unlink_base_data(base);
 771        return NULL;
 772}
 773
 774static void find_unresolved_deltas(struct base_data *base)
 775{
 776        struct base_data *new_base, *prev_base = NULL;
 777        for (;;) {
 778                new_base = find_unresolved_deltas_1(base, prev_base);
 779
 780                if (new_base) {
 781                        prev_base = base;
 782                        base = new_base;
 783                } else {
 784                        free(base);
 785                        base = prev_base;
 786                        if (!base)
 787                                return;
 788                        prev_base = base->base;
 789                }
 790        }
 791}
 792
 793static int compare_delta_entry(const void *a, const void *b)
 794{
 795        const struct delta_entry *delta_a = a;
 796        const struct delta_entry *delta_b = b;
 797
 798        /* group by type (ref vs ofs) and then by value (sha-1 or offset) */
 799        return compare_delta_bases(&delta_a->base, &delta_b->base,
 800                                   objects[delta_a->obj_no].type,
 801                                   objects[delta_b->obj_no].type);
 802}
 803
 804static void resolve_base(struct object_entry *obj)
 805{
 806        struct base_data *base_obj = alloc_base_data();
 807        base_obj->obj = obj;
 808        base_obj->data = NULL;
 809        find_unresolved_deltas(base_obj);
 810}
 811
 812#ifndef NO_PTHREADS
 813static void *threaded_second_pass(void *data)
 814{
 815        set_thread_data(data);
 816        for (;;) {
 817                int i;
 818                work_lock();
 819                display_progress(progress, nr_resolved_deltas);
 820                while (nr_dispatched < nr_objects &&
 821                       is_delta_type(objects[nr_dispatched].type))
 822                        nr_dispatched++;
 823                if (nr_dispatched >= nr_objects) {
 824                        work_unlock();
 825                        break;
 826                }
 827                i = nr_dispatched++;
 828                work_unlock();
 829
 830                resolve_base(&objects[i]);
 831        }
 832        return NULL;
 833}
 834#endif
 835
 836/*
 837 * First pass:
 838 * - find locations of all objects;
 839 * - calculate SHA1 of all non-delta objects;
 840 * - remember base (SHA1 or offset) for all deltas.
 841 */
 842static void parse_pack_objects(unsigned char *sha1)
 843{
 844        int i;
 845        struct delta_entry *delta = deltas;
 846        struct stat st;
 847
 848        if (verbose)
 849                progress = start_progress(
 850                                from_stdin ? _("Receiving objects") : _("Indexing objects"),
 851                                nr_objects);
 852        for (i = 0; i < nr_objects; i++) {
 853                struct object_entry *obj = &objects[i];
 854                void *data = unpack_raw_entry(obj, &delta->base);
 855                obj->real_type = obj->type;
 856                if (is_delta_type(obj->type)) {
 857                        nr_deltas++;
 858                        delta->obj_no = i;
 859                        delta++;
 860                } else
 861                        sha1_object(data, obj->size, obj->type, obj->idx.sha1);
 862                free(data);
 863                display_progress(progress, i+1);
 864        }
 865        objects[i].idx.offset = consumed_bytes;
 866        stop_progress(&progress);
 867
 868        /* Check pack integrity */
 869        flush();
 870        git_SHA1_Final(sha1, &input_ctx);
 871        if (hashcmp(fill(20), sha1))
 872                die(_("pack is corrupted (SHA1 mismatch)"));
 873        use(20);
 874
 875        /* If input_fd is a file, we should have reached its end now. */
 876        if (fstat(input_fd, &st))
 877                die_errno(_("cannot fstat packfile"));
 878        if (S_ISREG(st.st_mode) &&
 879                        lseek(input_fd, 0, SEEK_CUR) - input_len != st.st_size)
 880                die(_("pack has junk at the end"));
 881}
 882
 883/*
 884 * Second pass:
 885 * - for all non-delta objects, look if it is used as a base for
 886 *   deltas;
 887 * - if used as a base, uncompress the object and apply all deltas,
 888 *   recursively checking if the resulting object is used as a base
 889 *   for some more deltas.
 890 */
 891static void resolve_deltas(void)
 892{
 893        int i;
 894
 895        if (!nr_deltas)
 896                return;
 897
 898        /* Sort deltas by base SHA1/offset for fast searching */
 899        qsort(deltas, nr_deltas, sizeof(struct delta_entry),
 900              compare_delta_entry);
 901
 902        if (verbose)
 903                progress = start_progress(_("Resolving deltas"), nr_deltas);
 904
 905#ifndef NO_PTHREADS
 906        nr_dispatched = 0;
 907        if (nr_threads > 1 || getenv("GIT_FORCE_THREADS")) {
 908                init_thread();
 909                for (i = 0; i < nr_threads; i++) {
 910                        int ret = pthread_create(&thread_data[i].thread, NULL,
 911                                                 threaded_second_pass, thread_data + i);
 912                        if (ret)
 913                                die("unable to create thread: %s", strerror(ret));
 914                }
 915                for (i = 0; i < nr_threads; i++)
 916                        pthread_join(thread_data[i].thread, NULL);
 917                cleanup_thread();
 918                return;
 919        }
 920#endif
 921
 922        for (i = 0; i < nr_objects; i++) {
 923                struct object_entry *obj = &objects[i];
 924
 925                if (is_delta_type(obj->type))
 926                        continue;
 927                resolve_base(obj);
 928                display_progress(progress, nr_resolved_deltas);
 929        }
 930}
 931
 932/*
 933 * Third pass:
 934 * - append objects to convert thin pack to full pack if required
 935 * - write the final 20-byte SHA-1
 936 */
 937static void fix_unresolved_deltas(struct sha1file *f, int nr_unresolved);
 938static void conclude_pack(int fix_thin_pack, const char *curr_pack, unsigned char *pack_sha1)
 939{
 940        if (nr_deltas == nr_resolved_deltas) {
 941                stop_progress(&progress);
 942                /* Flush remaining pack final 20-byte SHA1. */
 943                flush();
 944                return;
 945        }
 946
 947        if (fix_thin_pack) {
 948                struct sha1file *f;
 949                unsigned char read_sha1[20], tail_sha1[20];
 950                char msg[48];
 951                int nr_unresolved = nr_deltas - nr_resolved_deltas;
 952                int nr_objects_initial = nr_objects;
 953                if (nr_unresolved <= 0)
 954                        die(_("confusion beyond insanity"));
 955                objects = xrealloc(objects,
 956                                   (nr_objects + nr_unresolved + 1)
 957                                   * sizeof(*objects));
 958                f = sha1fd(output_fd, curr_pack);
 959                fix_unresolved_deltas(f, nr_unresolved);
 960                sprintf(msg, "completed with %d local objects",
 961                        nr_objects - nr_objects_initial);
 962                stop_progress_msg(&progress, msg);
 963                sha1close(f, tail_sha1, 0);
 964                hashcpy(read_sha1, pack_sha1);
 965                fixup_pack_header_footer(output_fd, pack_sha1,
 966                                         curr_pack, nr_objects,
 967                                         read_sha1, consumed_bytes-20);
 968                if (hashcmp(read_sha1, tail_sha1) != 0)
 969                        die("Unexpected tail checksum for %s "
 970                            "(disk corruption?)", curr_pack);
 971        }
 972        if (nr_deltas != nr_resolved_deltas)
 973                die(Q_("pack has %d unresolved delta",
 974                       "pack has %d unresolved deltas",
 975                       nr_deltas - nr_resolved_deltas),
 976                    nr_deltas - nr_resolved_deltas);
 977}
 978
 979static int write_compressed(struct sha1file *f, void *in, unsigned int size)
 980{
 981        git_zstream stream;
 982        int status;
 983        unsigned char outbuf[4096];
 984
 985        memset(&stream, 0, sizeof(stream));
 986        git_deflate_init(&stream, zlib_compression_level);
 987        stream.next_in = in;
 988        stream.avail_in = size;
 989
 990        do {
 991                stream.next_out = outbuf;
 992                stream.avail_out = sizeof(outbuf);
 993                status = git_deflate(&stream, Z_FINISH);
 994                sha1write(f, outbuf, sizeof(outbuf) - stream.avail_out);
 995        } while (status == Z_OK);
 996
 997        if (status != Z_STREAM_END)
 998                die(_("unable to deflate appended object (%d)"), status);
 999        size = stream.total_out;
1000        git_deflate_end(&stream);
1001        return size;
1002}
1003
1004static struct object_entry *append_obj_to_pack(struct sha1file *f,
1005                               const unsigned char *sha1, void *buf,
1006                               unsigned long size, enum object_type type)
1007{
1008        struct object_entry *obj = &objects[nr_objects++];
1009        unsigned char header[10];
1010        unsigned long s = size;
1011        int n = 0;
1012        unsigned char c = (type << 4) | (s & 15);
1013        s >>= 4;
1014        while (s) {
1015                header[n++] = c | 0x80;
1016                c = s & 0x7f;
1017                s >>= 7;
1018        }
1019        header[n++] = c;
1020        crc32_begin(f);
1021        sha1write(f, header, n);
1022        obj[0].size = size;
1023        obj[0].hdr_size = n;
1024        obj[0].type = type;
1025        obj[0].real_type = type;
1026        obj[1].idx.offset = obj[0].idx.offset + n;
1027        obj[1].idx.offset += write_compressed(f, buf, size);
1028        obj[0].idx.crc32 = crc32_end(f);
1029        sha1flush(f);
1030        hashcpy(obj->idx.sha1, sha1);
1031        return obj;
1032}
1033
1034static int delta_pos_compare(const void *_a, const void *_b)
1035{
1036        struct delta_entry *a = *(struct delta_entry **)_a;
1037        struct delta_entry *b = *(struct delta_entry **)_b;
1038        return a->obj_no - b->obj_no;
1039}
1040
1041static void fix_unresolved_deltas(struct sha1file *f, int nr_unresolved)
1042{
1043        struct delta_entry **sorted_by_pos;
1044        int i, n = 0;
1045
1046        /*
1047         * Since many unresolved deltas may well be themselves base objects
1048         * for more unresolved deltas, we really want to include the
1049         * smallest number of base objects that would cover as much delta
1050         * as possible by picking the
1051         * trunc deltas first, allowing for other deltas to resolve without
1052         * additional base objects.  Since most base objects are to be found
1053         * before deltas depending on them, a good heuristic is to start
1054         * resolving deltas in the same order as their position in the pack.
1055         */
1056        sorted_by_pos = xmalloc(nr_unresolved * sizeof(*sorted_by_pos));
1057        for (i = 0; i < nr_deltas; i++) {
1058                if (objects[deltas[i].obj_no].real_type != OBJ_REF_DELTA)
1059                        continue;
1060                sorted_by_pos[n++] = &deltas[i];
1061        }
1062        qsort(sorted_by_pos, n, sizeof(*sorted_by_pos), delta_pos_compare);
1063
1064        for (i = 0; i < n; i++) {
1065                struct delta_entry *d = sorted_by_pos[i];
1066                enum object_type type;
1067                struct base_data *base_obj = alloc_base_data();
1068
1069                if (objects[d->obj_no].real_type != OBJ_REF_DELTA)
1070                        continue;
1071                base_obj->data = read_sha1_file(d->base.sha1, &type, &base_obj->size);
1072                if (!base_obj->data)
1073                        continue;
1074
1075                if (check_sha1_signature(d->base.sha1, base_obj->data,
1076                                base_obj->size, typename(type)))
1077                        die(_("local object %s is corrupt"), sha1_to_hex(d->base.sha1));
1078                base_obj->obj = append_obj_to_pack(f, d->base.sha1,
1079                                        base_obj->data, base_obj->size, type);
1080                find_unresolved_deltas(base_obj);
1081                display_progress(progress, nr_resolved_deltas);
1082        }
1083        free(sorted_by_pos);
1084}
1085
1086static void final(const char *final_pack_name, const char *curr_pack_name,
1087                  const char *final_index_name, const char *curr_index_name,
1088                  const char *keep_name, const char *keep_msg,
1089                  unsigned char *sha1)
1090{
1091        const char *report = "pack";
1092        char name[PATH_MAX];
1093        int err;
1094
1095        if (!from_stdin) {
1096                close(input_fd);
1097        } else {
1098                fsync_or_die(output_fd, curr_pack_name);
1099                err = close(output_fd);
1100                if (err)
1101                        die_errno(_("error while closing pack file"));
1102        }
1103
1104        if (keep_msg) {
1105                int keep_fd, keep_msg_len = strlen(keep_msg);
1106
1107                if (!keep_name)
1108                        keep_fd = odb_pack_keep(name, sizeof(name), sha1);
1109                else
1110                        keep_fd = open(keep_name, O_RDWR|O_CREAT|O_EXCL, 0600);
1111
1112                if (keep_fd < 0) {
1113                        if (errno != EEXIST)
1114                                die_errno(_("cannot write keep file '%s'"),
1115                                          keep_name);
1116                } else {
1117                        if (keep_msg_len > 0) {
1118                                write_or_die(keep_fd, keep_msg, keep_msg_len);
1119                                write_or_die(keep_fd, "\n", 1);
1120                        }
1121                        if (close(keep_fd) != 0)
1122                                die_errno(_("cannot close written keep file '%s'"),
1123                                    keep_name);
1124                        report = "keep";
1125                }
1126        }
1127
1128        if (final_pack_name != curr_pack_name) {
1129                if (!final_pack_name) {
1130                        snprintf(name, sizeof(name), "%s/pack/pack-%s.pack",
1131                                 get_object_directory(), sha1_to_hex(sha1));
1132                        final_pack_name = name;
1133                }
1134                if (move_temp_to_file(curr_pack_name, final_pack_name))
1135                        die(_("cannot store pack file"));
1136        } else if (from_stdin)
1137                chmod(final_pack_name, 0444);
1138
1139        if (final_index_name != curr_index_name) {
1140                if (!final_index_name) {
1141                        snprintf(name, sizeof(name), "%s/pack/pack-%s.idx",
1142                                 get_object_directory(), sha1_to_hex(sha1));
1143                        final_index_name = name;
1144                }
1145                if (move_temp_to_file(curr_index_name, final_index_name))
1146                        die(_("cannot store index file"));
1147        } else
1148                chmod(final_index_name, 0444);
1149
1150        if (!from_stdin) {
1151                printf("%s\n", sha1_to_hex(sha1));
1152        } else {
1153                char buf[48];
1154                int len = snprintf(buf, sizeof(buf), "%s\t%s\n",
1155                                   report, sha1_to_hex(sha1));
1156                write_or_die(1, buf, len);
1157
1158                /*
1159                 * Let's just mimic git-unpack-objects here and write
1160                 * the last part of the input buffer to stdout.
1161                 */
1162                while (input_len) {
1163                        err = xwrite(1, input_buffer + input_offset, input_len);
1164                        if (err <= 0)
1165                                break;
1166                        input_len -= err;
1167                        input_offset += err;
1168                }
1169        }
1170}
1171
1172static int git_index_pack_config(const char *k, const char *v, void *cb)
1173{
1174        struct pack_idx_option *opts = cb;
1175
1176        if (!strcmp(k, "pack.indexversion")) {
1177                opts->version = git_config_int(k, v);
1178                if (opts->version > 2)
1179                        die("bad pack.indexversion=%"PRIu32, opts->version);
1180                return 0;
1181        }
1182        if (!strcmp(k, "pack.threads")) {
1183                nr_threads = git_config_int(k, v);
1184                if (nr_threads < 0)
1185                        die("invalid number of threads specified (%d)",
1186                            nr_threads);
1187#ifdef NO_PTHREADS
1188                if (nr_threads != 1)
1189                        warning("no threads support, ignoring %s", k);
1190                nr_threads = 1;
1191#endif
1192                return 0;
1193        }
1194        return git_default_config(k, v, cb);
1195}
1196
1197static int cmp_uint32(const void *a_, const void *b_)
1198{
1199        uint32_t a = *((uint32_t *)a_);
1200        uint32_t b = *((uint32_t *)b_);
1201
1202        return (a < b) ? -1 : (a != b);
1203}
1204
1205static void read_v2_anomalous_offsets(struct packed_git *p,
1206                                      struct pack_idx_option *opts)
1207{
1208        const uint32_t *idx1, *idx2;
1209        uint32_t i;
1210
1211        /* The address of the 4-byte offset table */
1212        idx1 = (((const uint32_t *)p->index_data)
1213                + 2 /* 8-byte header */
1214                + 256 /* fan out */
1215                + 5 * p->num_objects /* 20-byte SHA-1 table */
1216                + p->num_objects /* CRC32 table */
1217                );
1218
1219        /* The address of the 8-byte offset table */
1220        idx2 = idx1 + p->num_objects;
1221
1222        for (i = 0; i < p->num_objects; i++) {
1223                uint32_t off = ntohl(idx1[i]);
1224                if (!(off & 0x80000000))
1225                        continue;
1226                off = off & 0x7fffffff;
1227                if (idx2[off * 2])
1228                        continue;
1229                /*
1230                 * The real offset is ntohl(idx2[off * 2]) in high 4
1231                 * octets, and ntohl(idx2[off * 2 + 1]) in low 4
1232                 * octets.  But idx2[off * 2] is Zero!!!
1233                 */
1234                ALLOC_GROW(opts->anomaly, opts->anomaly_nr + 1, opts->anomaly_alloc);
1235                opts->anomaly[opts->anomaly_nr++] = ntohl(idx2[off * 2 + 1]);
1236        }
1237
1238        if (1 < opts->anomaly_nr)
1239                qsort(opts->anomaly, opts->anomaly_nr, sizeof(uint32_t), cmp_uint32);
1240}
1241
1242static void read_idx_option(struct pack_idx_option *opts, const char *pack_name)
1243{
1244        struct packed_git *p = add_packed_git(pack_name, strlen(pack_name), 1);
1245
1246        if (!p)
1247                die(_("Cannot open existing pack file '%s'"), pack_name);
1248        if (open_pack_index(p))
1249                die(_("Cannot open existing pack idx file for '%s'"), pack_name);
1250
1251        /* Read the attributes from the existing idx file */
1252        opts->version = p->index_version;
1253
1254        if (opts->version == 2)
1255                read_v2_anomalous_offsets(p, opts);
1256
1257        /*
1258         * Get rid of the idx file as we do not need it anymore.
1259         * NEEDSWORK: extract this bit from free_pack_by_name() in
1260         * sha1_file.c, perhaps?  It shouldn't matter very much as we
1261         * know we haven't installed this pack (hence we never have
1262         * read anything from it).
1263         */
1264        close_pack_index(p);
1265        free(p);
1266}
1267
1268static void show_pack_info(int stat_only)
1269{
1270        int i, baseobjects = nr_objects - nr_deltas;
1271        unsigned long *chain_histogram = NULL;
1272
1273        if (deepest_delta)
1274                chain_histogram = xcalloc(deepest_delta, sizeof(unsigned long));
1275
1276        for (i = 0; i < nr_objects; i++) {
1277                struct object_entry *obj = &objects[i];
1278
1279                if (is_delta_type(obj->type))
1280                        chain_histogram[obj->delta_depth - 1]++;
1281                if (stat_only)
1282                        continue;
1283                printf("%s %-6s %lu %lu %"PRIuMAX,
1284                       sha1_to_hex(obj->idx.sha1),
1285                       typename(obj->real_type), obj->size,
1286                       (unsigned long)(obj[1].idx.offset - obj->idx.offset),
1287                       (uintmax_t)obj->idx.offset);
1288                if (is_delta_type(obj->type)) {
1289                        struct object_entry *bobj = &objects[obj->base_object_no];
1290                        printf(" %u %s", obj->delta_depth, sha1_to_hex(bobj->idx.sha1));
1291                }
1292                putchar('\n');
1293        }
1294
1295        if (baseobjects)
1296                printf_ln(Q_("non delta: %d object",
1297                             "non delta: %d objects",
1298                             baseobjects),
1299                          baseobjects);
1300        for (i = 0; i < deepest_delta; i++) {
1301                if (!chain_histogram[i])
1302                        continue;
1303                printf_ln(Q_("chain length = %d: %lu object",
1304                             "chain length = %d: %lu objects",
1305                             chain_histogram[i]),
1306                          i + 1,
1307                          chain_histogram[i]);
1308        }
1309}
1310
1311int cmd_index_pack(int argc, const char **argv, const char *prefix)
1312{
1313        int i, fix_thin_pack = 0, verify = 0, stat_only = 0, stat = 0;
1314        const char *curr_pack, *curr_index;
1315        const char *index_name = NULL, *pack_name = NULL;
1316        const char *keep_name = NULL, *keep_msg = NULL;
1317        char *index_name_buf = NULL, *keep_name_buf = NULL;
1318        struct pack_idx_entry **idx_objects;
1319        struct pack_idx_option opts;
1320        unsigned char pack_sha1[20];
1321
1322        if (argc == 2 && !strcmp(argv[1], "-h"))
1323                usage(index_pack_usage);
1324
1325        read_replace_refs = 0;
1326
1327        reset_pack_idx_option(&opts);
1328        git_config(git_index_pack_config, &opts);
1329        if (prefix && chdir(prefix))
1330                die(_("Cannot come back to cwd"));
1331
1332        for (i = 1; i < argc; i++) {
1333                const char *arg = argv[i];
1334
1335                if (*arg == '-') {
1336                        if (!strcmp(arg, "--stdin")) {
1337                                from_stdin = 1;
1338                        } else if (!strcmp(arg, "--fix-thin")) {
1339                                fix_thin_pack = 1;
1340                        } else if (!strcmp(arg, "--strict")) {
1341                                strict = 1;
1342                        } else if (!strcmp(arg, "--verify")) {
1343                                verify = 1;
1344                        } else if (!strcmp(arg, "--verify-stat")) {
1345                                verify = 1;
1346                                stat = 1;
1347                        } else if (!strcmp(arg, "--verify-stat-only")) {
1348                                verify = 1;
1349                                stat = 1;
1350                                stat_only = 1;
1351                        } else if (!strcmp(arg, "--keep")) {
1352                                keep_msg = "";
1353                        } else if (!prefixcmp(arg, "--keep=")) {
1354                                keep_msg = arg + 7;
1355                        } else if (!prefixcmp(arg, "--threads=")) {
1356                                char *end;
1357                                nr_threads = strtoul(arg+10, &end, 0);
1358                                if (!arg[10] || *end || nr_threads < 0)
1359                                        usage(index_pack_usage);
1360#ifdef NO_PTHREADS
1361                                if (nr_threads != 1)
1362                                        warning("no threads support, "
1363                                                "ignoring %s", arg);
1364                                nr_threads = 1;
1365#endif
1366                        } else if (!prefixcmp(arg, "--pack_header=")) {
1367                                struct pack_header *hdr;
1368                                char *c;
1369
1370                                hdr = (struct pack_header *)input_buffer;
1371                                hdr->hdr_signature = htonl(PACK_SIGNATURE);
1372                                hdr->hdr_version = htonl(strtoul(arg + 14, &c, 10));
1373                                if (*c != ',')
1374                                        die(_("bad %s"), arg);
1375                                hdr->hdr_entries = htonl(strtoul(c + 1, &c, 10));
1376                                if (*c)
1377                                        die(_("bad %s"), arg);
1378                                input_len = sizeof(*hdr);
1379                        } else if (!strcmp(arg, "-v")) {
1380                                verbose = 1;
1381                        } else if (!strcmp(arg, "-o")) {
1382                                if (index_name || (i+1) >= argc)
1383                                        usage(index_pack_usage);
1384                                index_name = argv[++i];
1385                        } else if (!prefixcmp(arg, "--index-version=")) {
1386                                char *c;
1387                                opts.version = strtoul(arg + 16, &c, 10);
1388                                if (opts.version > 2)
1389                                        die(_("bad %s"), arg);
1390                                if (*c == ',')
1391                                        opts.off32_limit = strtoul(c+1, &c, 0);
1392                                if (*c || opts.off32_limit & 0x80000000)
1393                                        die(_("bad %s"), arg);
1394                        } else
1395                                usage(index_pack_usage);
1396                        continue;
1397                }
1398
1399                if (pack_name)
1400                        usage(index_pack_usage);
1401                pack_name = arg;
1402        }
1403
1404        if (!pack_name && !from_stdin)
1405                usage(index_pack_usage);
1406        if (fix_thin_pack && !from_stdin)
1407                die(_("--fix-thin cannot be used without --stdin"));
1408        if (!index_name && pack_name) {
1409                int len = strlen(pack_name);
1410                if (!has_extension(pack_name, ".pack"))
1411                        die(_("packfile name '%s' does not end with '.pack'"),
1412                            pack_name);
1413                index_name_buf = xmalloc(len);
1414                memcpy(index_name_buf, pack_name, len - 5);
1415                strcpy(index_name_buf + len - 5, ".idx");
1416                index_name = index_name_buf;
1417        }
1418        if (keep_msg && !keep_name && pack_name) {
1419                int len = strlen(pack_name);
1420                if (!has_extension(pack_name, ".pack"))
1421                        die(_("packfile name '%s' does not end with '.pack'"),
1422                            pack_name);
1423                keep_name_buf = xmalloc(len);
1424                memcpy(keep_name_buf, pack_name, len - 5);
1425                strcpy(keep_name_buf + len - 5, ".keep");
1426                keep_name = keep_name_buf;
1427        }
1428        if (verify) {
1429                if (!index_name)
1430                        die(_("--verify with no packfile name given"));
1431                read_idx_option(&opts, index_name);
1432                opts.flags |= WRITE_IDX_VERIFY | WRITE_IDX_STRICT;
1433        }
1434        if (strict)
1435                opts.flags |= WRITE_IDX_STRICT;
1436
1437#ifndef NO_PTHREADS
1438        if (!nr_threads) {
1439                nr_threads = online_cpus();
1440                /* An experiment showed that more threads does not mean faster */
1441                if (nr_threads > 3)
1442                        nr_threads = 3;
1443        }
1444#endif
1445
1446        curr_pack = open_pack_file(pack_name);
1447        parse_pack_header();
1448        objects = xcalloc(nr_objects + 1, sizeof(struct object_entry));
1449        deltas = xcalloc(nr_objects, sizeof(struct delta_entry));
1450        parse_pack_objects(pack_sha1);
1451        resolve_deltas();
1452        conclude_pack(fix_thin_pack, curr_pack, pack_sha1);
1453        free(deltas);
1454        if (strict)
1455                check_objects();
1456
1457        if (stat)
1458                show_pack_info(stat_only);
1459
1460        idx_objects = xmalloc((nr_objects) * sizeof(struct pack_idx_entry *));
1461        for (i = 0; i < nr_objects; i++)
1462                idx_objects[i] = &objects[i].idx;
1463        curr_index = write_idx_file(index_name, idx_objects, nr_objects, &opts, pack_sha1);
1464        free(idx_objects);
1465
1466        if (!verify)
1467                final(pack_name, curr_pack,
1468                      index_name, curr_index,
1469                      keep_name, keep_msg,
1470                      pack_sha1);
1471        else
1472                close(input_fd);
1473        free(objects);
1474        free(index_name_buf);
1475        free(keep_name_buf);
1476        if (pack_name == NULL)
1477                free((void *) curr_pack);
1478        if (index_name == NULL)
1479                free((void *) curr_index);
1480
1481        return 0;
1482}