index-pack.con commit Add shortcut in refresh_cache_ent() for marked entries. (aa9349d)
   1#include "cache.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
  12static const char index_pack_usage[] =
  13"git-index-pack [-v] [-o <index-file>] [{ ---keep | --keep=<msg> }] [--strict] { <pack-file> | --stdin [--fix-thin] [<pack-file>] }";
  14
  15struct object_entry
  16{
  17        struct pack_idx_entry idx;
  18        unsigned long size;
  19        unsigned int hdr_size;
  20        enum object_type type;
  21        enum object_type real_type;
  22};
  23
  24union delta_base {
  25        unsigned char sha1[20];
  26        off_t offset;
  27};
  28
  29/*
  30 * Even if sizeof(union delta_base) == 24 on 64-bit archs, we really want
  31 * to memcmp() only the first 20 bytes.
  32 */
  33#define UNION_BASE_SZ   20
  34
  35#define FLAG_LINK (1u<<20)
  36#define FLAG_CHECKED (1u<<21)
  37
  38struct delta_entry
  39{
  40        union delta_base base;
  41        int obj_no;
  42};
  43
  44static struct object_entry *objects;
  45static struct delta_entry *deltas;
  46static int nr_objects;
  47static int nr_deltas;
  48static int nr_resolved_deltas;
  49
  50static int from_stdin;
  51static int strict;
  52static int verbose;
  53
  54static struct progress *progress;
  55
  56/* We always read in 4kB chunks. */
  57static unsigned char input_buffer[4096];
  58static unsigned int input_offset, input_len;
  59static off_t consumed_bytes;
  60static SHA_CTX input_ctx;
  61static uint32_t input_crc32;
  62static int input_fd, output_fd, pack_fd;
  63
  64static int mark_link(struct object *obj, int type, void *data)
  65{
  66        if (!obj)
  67                return -1;
  68
  69        if (type != OBJ_ANY && obj->type != type)
  70                die("object type mismatch at %s", sha1_to_hex(obj->sha1));
  71
  72        obj->flags |= FLAG_LINK;
  73        return 0;
  74}
  75
  76/* The content of each linked object must have been checked
  77   or it must be already present in the object database */
  78static void check_object(struct object *obj)
  79{
  80        if (!obj)
  81                return;
  82
  83        if (!(obj->flags & FLAG_LINK))
  84                return;
  85
  86        if (!(obj->flags & FLAG_CHECKED)) {
  87                unsigned long size;
  88                int type = sha1_object_info(obj->sha1, &size);
  89                if (type != obj->type || type <= 0)
  90                        die("object of unexpected type");
  91                obj->flags |= FLAG_CHECKED;
  92                return;
  93        }
  94}
  95
  96static void check_objects(void)
  97{
  98        unsigned i, max;
  99
 100        max = get_max_object_index();
 101        for (i = 0; i < max; i++)
 102                check_object(get_indexed_object(i));
 103}
 104
 105
 106/* Discard current buffer used content. */
 107static void flush(void)
 108{
 109        if (input_offset) {
 110                if (output_fd >= 0)
 111                        write_or_die(output_fd, input_buffer, input_offset);
 112                SHA1_Update(&input_ctx, input_buffer, input_offset);
 113                memmove(input_buffer, input_buffer + input_offset, input_len);
 114                input_offset = 0;
 115        }
 116}
 117
 118/*
 119 * Make sure at least "min" bytes are available in the buffer, and
 120 * return the pointer to the buffer.
 121 */
 122static void *fill(int min)
 123{
 124        if (min <= input_len)
 125                return input_buffer + input_offset;
 126        if (min > sizeof(input_buffer))
 127                die("cannot fill %d bytes", min);
 128        flush();
 129        do {
 130                ssize_t ret = xread(input_fd, input_buffer + input_len,
 131                                sizeof(input_buffer) - input_len);
 132                if (ret <= 0) {
 133                        if (!ret)
 134                                die("early EOF");
 135                        die("read error on input: %s", strerror(errno));
 136                }
 137                input_len += ret;
 138                if (from_stdin)
 139                        display_throughput(progress, consumed_bytes + input_len);
 140        } while (input_len < min);
 141        return input_buffer;
 142}
 143
 144static void use(int bytes)
 145{
 146        if (bytes > input_len)
 147                die("used more bytes than were available");
 148        input_crc32 = crc32(input_crc32, input_buffer + input_offset, bytes);
 149        input_len -= bytes;
 150        input_offset += bytes;
 151
 152        /* make sure off_t is sufficiently large not to wrap */
 153        if (consumed_bytes > consumed_bytes + bytes)
 154                die("pack too large for current definition of off_t");
 155        consumed_bytes += bytes;
 156}
 157
 158static char *open_pack_file(char *pack_name)
 159{
 160        if (from_stdin) {
 161                input_fd = 0;
 162                if (!pack_name) {
 163                        static char tmpfile[PATH_MAX];
 164                        snprintf(tmpfile, sizeof(tmpfile),
 165                                 "%s/tmp_pack_XXXXXX", get_object_directory());
 166                        output_fd = xmkstemp(tmpfile);
 167                        pack_name = xstrdup(tmpfile);
 168                } else
 169                        output_fd = open(pack_name, O_CREAT|O_EXCL|O_RDWR, 0600);
 170                if (output_fd < 0)
 171                        die("unable to create %s: %s\n", pack_name, strerror(errno));
 172                pack_fd = output_fd;
 173        } else {
 174                input_fd = open(pack_name, O_RDONLY);
 175                if (input_fd < 0)
 176                        die("cannot open packfile '%s': %s",
 177                            pack_name, strerror(errno));
 178                output_fd = -1;
 179                pack_fd = input_fd;
 180        }
 181        SHA1_Init(&input_ctx);
 182        return pack_name;
 183}
 184
 185static void parse_pack_header(void)
 186{
 187        struct pack_header *hdr = fill(sizeof(struct pack_header));
 188
 189        /* Header consistency check */
 190        if (hdr->hdr_signature != htonl(PACK_SIGNATURE))
 191                die("pack signature mismatch");
 192        if (!pack_version_ok(hdr->hdr_version))
 193                die("pack version %d unsupported", ntohl(hdr->hdr_version));
 194
 195        nr_objects = ntohl(hdr->hdr_entries);
 196        use(sizeof(struct pack_header));
 197}
 198
 199static void bad_object(unsigned long offset, const char *format,
 200                       ...) NORETURN __attribute__((format (printf, 2, 3)));
 201
 202static void bad_object(unsigned long offset, const char *format, ...)
 203{
 204        va_list params;
 205        char buf[1024];
 206
 207        va_start(params, format);
 208        vsnprintf(buf, sizeof(buf), format, params);
 209        va_end(params);
 210        die("pack has bad object at offset %lu: %s", offset, buf);
 211}
 212
 213static void *unpack_entry_data(unsigned long offset, unsigned long size)
 214{
 215        z_stream stream;
 216        void *buf = xmalloc(size);
 217
 218        memset(&stream, 0, sizeof(stream));
 219        stream.next_out = buf;
 220        stream.avail_out = size;
 221        stream.next_in = fill(1);
 222        stream.avail_in = input_len;
 223        inflateInit(&stream);
 224
 225        for (;;) {
 226                int ret = inflate(&stream, 0);
 227                use(input_len - stream.avail_in);
 228                if (stream.total_out == size && ret == Z_STREAM_END)
 229                        break;
 230                if (ret != Z_OK)
 231                        bad_object(offset, "inflate returned %d", ret);
 232                stream.next_in = fill(1);
 233                stream.avail_in = input_len;
 234        }
 235        inflateEnd(&stream);
 236        return buf;
 237}
 238
 239static void *unpack_raw_entry(struct object_entry *obj, union delta_base *delta_base)
 240{
 241        unsigned char *p, c;
 242        unsigned long size;
 243        off_t base_offset;
 244        unsigned shift;
 245        void *data;
 246
 247        obj->idx.offset = consumed_bytes;
 248        input_crc32 = crc32(0, Z_NULL, 0);
 249
 250        p = fill(1);
 251        c = *p;
 252        use(1);
 253        obj->type = (c >> 4) & 7;
 254        size = (c & 15);
 255        shift = 4;
 256        while (c & 0x80) {
 257                p = fill(1);
 258                c = *p;
 259                use(1);
 260                size += (c & 0x7fUL) << shift;
 261                shift += 7;
 262        }
 263        obj->size = size;
 264
 265        switch (obj->type) {
 266        case OBJ_REF_DELTA:
 267                hashcpy(delta_base->sha1, fill(20));
 268                use(20);
 269                break;
 270        case OBJ_OFS_DELTA:
 271                memset(delta_base, 0, sizeof(*delta_base));
 272                p = fill(1);
 273                c = *p;
 274                use(1);
 275                base_offset = c & 127;
 276                while (c & 128) {
 277                        base_offset += 1;
 278                        if (!base_offset || MSB(base_offset, 7))
 279                                bad_object(obj->idx.offset, "offset value overflow for delta base object");
 280                        p = fill(1);
 281                        c = *p;
 282                        use(1);
 283                        base_offset = (base_offset << 7) + (c & 127);
 284                }
 285                delta_base->offset = obj->idx.offset - base_offset;
 286                if (delta_base->offset >= obj->idx.offset)
 287                        bad_object(obj->idx.offset, "delta base offset is out of bound");
 288                break;
 289        case OBJ_COMMIT:
 290        case OBJ_TREE:
 291        case OBJ_BLOB:
 292        case OBJ_TAG:
 293                break;
 294        default:
 295                bad_object(obj->idx.offset, "unknown object type %d", obj->type);
 296        }
 297        obj->hdr_size = consumed_bytes - obj->idx.offset;
 298
 299        data = unpack_entry_data(obj->idx.offset, obj->size);
 300        obj->idx.crc32 = input_crc32;
 301        return data;
 302}
 303
 304static void *get_data_from_pack(struct object_entry *obj)
 305{
 306        off_t from = obj[0].idx.offset + obj[0].hdr_size;
 307        unsigned long len = obj[1].idx.offset - from;
 308        unsigned long rdy = 0;
 309        unsigned char *src, *data;
 310        z_stream stream;
 311        int st;
 312
 313        src = xmalloc(len);
 314        data = src;
 315        do {
 316                ssize_t n = pread(pack_fd, data + rdy, len - rdy, from + rdy);
 317                if (n <= 0)
 318                        die("cannot pread pack file: %s", strerror(errno));
 319                rdy += n;
 320        } while (rdy < len);
 321        data = xmalloc(obj->size);
 322        memset(&stream, 0, sizeof(stream));
 323        stream.next_out = data;
 324        stream.avail_out = obj->size;
 325        stream.next_in = src;
 326        stream.avail_in = len;
 327        inflateInit(&stream);
 328        while ((st = inflate(&stream, Z_FINISH)) == Z_OK);
 329        inflateEnd(&stream);
 330        if (st != Z_STREAM_END || stream.total_out != obj->size)
 331                die("serious inflate inconsistency");
 332        free(src);
 333        return data;
 334}
 335
 336static int find_delta(const union delta_base *base)
 337{
 338        int first = 0, last = nr_deltas;
 339
 340        while (first < last) {
 341                int next = (first + last) / 2;
 342                struct delta_entry *delta = &deltas[next];
 343                int cmp;
 344
 345                cmp = memcmp(base, &delta->base, UNION_BASE_SZ);
 346                if (!cmp)
 347                        return next;
 348                if (cmp < 0) {
 349                        last = next;
 350                        continue;
 351                }
 352                first = next+1;
 353        }
 354        return -first-1;
 355}
 356
 357static int find_delta_children(const union delta_base *base,
 358                               int *first_index, int *last_index)
 359{
 360        int first = find_delta(base);
 361        int last = first;
 362        int end = nr_deltas - 1;
 363
 364        if (first < 0)
 365                return -1;
 366        while (first > 0 && !memcmp(&deltas[first - 1].base, base, UNION_BASE_SZ))
 367                --first;
 368        while (last < end && !memcmp(&deltas[last + 1].base, base, UNION_BASE_SZ))
 369                ++last;
 370        *first_index = first;
 371        *last_index = last;
 372        return 0;
 373}
 374
 375static void sha1_object(const void *data, unsigned long size,
 376                        enum object_type type, unsigned char *sha1)
 377{
 378        hash_sha1_file(data, size, typename(type), sha1);
 379        if (has_sha1_file(sha1)) {
 380                void *has_data;
 381                enum object_type has_type;
 382                unsigned long has_size;
 383                has_data = read_sha1_file(sha1, &has_type, &has_size);
 384                if (!has_data)
 385                        die("cannot read existing object %s", sha1_to_hex(sha1));
 386                if (size != has_size || type != has_type ||
 387                    memcmp(data, has_data, size) != 0)
 388                        die("SHA1 COLLISION FOUND WITH %s !", sha1_to_hex(sha1));
 389                free(has_data);
 390        }
 391        if (strict) {
 392                if (type == OBJ_BLOB) {
 393                        struct blob *blob = lookup_blob(sha1);
 394                        if (blob)
 395                                blob->object.flags |= FLAG_CHECKED;
 396                        else
 397                                die("invalid blob object %s", sha1_to_hex(sha1));
 398                } else {
 399                        struct object *obj;
 400                        int eaten;
 401                        void *buf = (void *) data;
 402
 403                        /*
 404                         * we do not need to free the memory here, as the
 405                         * buf is deleted by the caller.
 406                         */
 407                        obj = parse_object_buffer(sha1, type, size, buf, &eaten);
 408                        if (!obj)
 409                                die("invalid %s", typename(type));
 410                        if (fsck_object(obj, 1, fsck_error_function))
 411                                die("Error in object");
 412                        if (fsck_walk(obj, mark_link, 0))
 413                                die("Not all child objects of %s are reachable", sha1_to_hex(obj->sha1));
 414
 415                        if (obj->type == OBJ_TREE) {
 416                                struct tree *item = (struct tree *) obj;
 417                                item->buffer = NULL;
 418                        }
 419                        if (obj->type == OBJ_COMMIT) {
 420                                struct commit *commit = (struct commit *) obj;
 421                                commit->buffer = NULL;
 422                        }
 423                        obj->flags |= FLAG_CHECKED;
 424                }
 425        }
 426}
 427
 428static void resolve_delta(struct object_entry *delta_obj, void *base_data,
 429                          unsigned long base_size, enum object_type type)
 430{
 431        void *delta_data;
 432        unsigned long delta_size;
 433        void *result;
 434        unsigned long result_size;
 435        union delta_base delta_base;
 436        int j, first, last;
 437
 438        delta_obj->real_type = type;
 439        delta_data = get_data_from_pack(delta_obj);
 440        delta_size = delta_obj->size;
 441        result = patch_delta(base_data, base_size, delta_data, delta_size,
 442                             &result_size);
 443        free(delta_data);
 444        if (!result)
 445                bad_object(delta_obj->idx.offset, "failed to apply delta");
 446        sha1_object(result, result_size, type, delta_obj->idx.sha1);
 447        nr_resolved_deltas++;
 448
 449        hashcpy(delta_base.sha1, delta_obj->idx.sha1);
 450        if (!find_delta_children(&delta_base, &first, &last)) {
 451                for (j = first; j <= last; j++) {
 452                        struct object_entry *child = objects + deltas[j].obj_no;
 453                        if (child->real_type == OBJ_REF_DELTA)
 454                                resolve_delta(child, result, result_size, type);
 455                }
 456        }
 457
 458        memset(&delta_base, 0, sizeof(delta_base));
 459        delta_base.offset = delta_obj->idx.offset;
 460        if (!find_delta_children(&delta_base, &first, &last)) {
 461                for (j = first; j <= last; j++) {
 462                        struct object_entry *child = objects + deltas[j].obj_no;
 463                        if (child->real_type == OBJ_OFS_DELTA)
 464                                resolve_delta(child, result, result_size, type);
 465                }
 466        }
 467
 468        free(result);
 469}
 470
 471static int compare_delta_entry(const void *a, const void *b)
 472{
 473        const struct delta_entry *delta_a = a;
 474        const struct delta_entry *delta_b = b;
 475        return memcmp(&delta_a->base, &delta_b->base, UNION_BASE_SZ);
 476}
 477
 478/* Parse all objects and return the pack content SHA1 hash */
 479static void parse_pack_objects(unsigned char *sha1)
 480{
 481        int i;
 482        struct delta_entry *delta = deltas;
 483        void *data;
 484        struct stat st;
 485
 486        /*
 487         * First pass:
 488         * - find locations of all objects;
 489         * - calculate SHA1 of all non-delta objects;
 490         * - remember base (SHA1 or offset) for all deltas.
 491         */
 492        if (verbose)
 493                progress = start_progress(
 494                                from_stdin ? "Receiving objects" : "Indexing objects",
 495                                nr_objects);
 496        for (i = 0; i < nr_objects; i++) {
 497                struct object_entry *obj = &objects[i];
 498                data = unpack_raw_entry(obj, &delta->base);
 499                obj->real_type = obj->type;
 500                if (obj->type == OBJ_REF_DELTA || obj->type == OBJ_OFS_DELTA) {
 501                        nr_deltas++;
 502                        delta->obj_no = i;
 503                        delta++;
 504                } else
 505                        sha1_object(data, obj->size, obj->type, obj->idx.sha1);
 506                free(data);
 507                display_progress(progress, i+1);
 508        }
 509        objects[i].idx.offset = consumed_bytes;
 510        stop_progress(&progress);
 511
 512        /* Check pack integrity */
 513        flush();
 514        SHA1_Final(sha1, &input_ctx);
 515        if (hashcmp(fill(20), sha1))
 516                die("pack is corrupted (SHA1 mismatch)");
 517        use(20);
 518
 519        /* If input_fd is a file, we should have reached its end now. */
 520        if (fstat(input_fd, &st))
 521                die("cannot fstat packfile: %s", strerror(errno));
 522        if (S_ISREG(st.st_mode) &&
 523                        lseek(input_fd, 0, SEEK_CUR) - input_len != st.st_size)
 524                die("pack has junk at the end");
 525
 526        if (!nr_deltas)
 527                return;
 528
 529        /* Sort deltas by base SHA1/offset for fast searching */
 530        qsort(deltas, nr_deltas, sizeof(struct delta_entry),
 531              compare_delta_entry);
 532
 533        /*
 534         * Second pass:
 535         * - for all non-delta objects, look if it is used as a base for
 536         *   deltas;
 537         * - if used as a base, uncompress the object and apply all deltas,
 538         *   recursively checking if the resulting object is used as a base
 539         *   for some more deltas.
 540         */
 541        if (verbose)
 542                progress = start_progress("Resolving deltas", nr_deltas);
 543        for (i = 0; i < nr_objects; i++) {
 544                struct object_entry *obj = &objects[i];
 545                union delta_base base;
 546                int j, ref, ref_first, ref_last, ofs, ofs_first, ofs_last;
 547
 548                if (obj->type == OBJ_REF_DELTA || obj->type == OBJ_OFS_DELTA)
 549                        continue;
 550                hashcpy(base.sha1, obj->idx.sha1);
 551                ref = !find_delta_children(&base, &ref_first, &ref_last);
 552                memset(&base, 0, sizeof(base));
 553                base.offset = obj->idx.offset;
 554                ofs = !find_delta_children(&base, &ofs_first, &ofs_last);
 555                if (!ref && !ofs)
 556                        continue;
 557                data = get_data_from_pack(obj);
 558                if (ref)
 559                        for (j = ref_first; j <= ref_last; j++) {
 560                                struct object_entry *child = objects + deltas[j].obj_no;
 561                                if (child->real_type == OBJ_REF_DELTA)
 562                                        resolve_delta(child, data,
 563                                                      obj->size, obj->type);
 564                        }
 565                if (ofs)
 566                        for (j = ofs_first; j <= ofs_last; j++) {
 567                                struct object_entry *child = objects + deltas[j].obj_no;
 568                                if (child->real_type == OBJ_OFS_DELTA)
 569                                        resolve_delta(child, data,
 570                                                      obj->size, obj->type);
 571                        }
 572                free(data);
 573                display_progress(progress, nr_resolved_deltas);
 574        }
 575}
 576
 577static int write_compressed(int fd, void *in, unsigned int size, uint32_t *obj_crc)
 578{
 579        z_stream stream;
 580        unsigned long maxsize;
 581        void *out;
 582
 583        memset(&stream, 0, sizeof(stream));
 584        deflateInit(&stream, zlib_compression_level);
 585        maxsize = deflateBound(&stream, size);
 586        out = xmalloc(maxsize);
 587
 588        /* Compress it */
 589        stream.next_in = in;
 590        stream.avail_in = size;
 591        stream.next_out = out;
 592        stream.avail_out = maxsize;
 593        while (deflate(&stream, Z_FINISH) == Z_OK);
 594        deflateEnd(&stream);
 595
 596        size = stream.total_out;
 597        write_or_die(fd, out, size);
 598        *obj_crc = crc32(*obj_crc, out, size);
 599        free(out);
 600        return size;
 601}
 602
 603static void append_obj_to_pack(const unsigned char *sha1, void *buf,
 604                               unsigned long size, enum object_type type)
 605{
 606        struct object_entry *obj = &objects[nr_objects++];
 607        unsigned char header[10];
 608        unsigned long s = size;
 609        int n = 0;
 610        unsigned char c = (type << 4) | (s & 15);
 611        s >>= 4;
 612        while (s) {
 613                header[n++] = c | 0x80;
 614                c = s & 0x7f;
 615                s >>= 7;
 616        }
 617        header[n++] = c;
 618        write_or_die(output_fd, header, n);
 619        obj[0].idx.crc32 = crc32(0, Z_NULL, 0);
 620        obj[0].idx.crc32 = crc32(obj[0].idx.crc32, header, n);
 621        obj[1].idx.offset = obj[0].idx.offset + n;
 622        obj[1].idx.offset += write_compressed(output_fd, buf, size, &obj[0].idx.crc32);
 623        hashcpy(obj->idx.sha1, sha1);
 624}
 625
 626static int delta_pos_compare(const void *_a, const void *_b)
 627{
 628        struct delta_entry *a = *(struct delta_entry **)_a;
 629        struct delta_entry *b = *(struct delta_entry **)_b;
 630        return a->obj_no - b->obj_no;
 631}
 632
 633static void fix_unresolved_deltas(int nr_unresolved)
 634{
 635        struct delta_entry **sorted_by_pos;
 636        int i, n = 0;
 637
 638        /*
 639         * Since many unresolved deltas may well be themselves base objects
 640         * for more unresolved deltas, we really want to include the
 641         * smallest number of base objects that would cover as much delta
 642         * as possible by picking the
 643         * trunc deltas first, allowing for other deltas to resolve without
 644         * additional base objects.  Since most base objects are to be found
 645         * before deltas depending on them, a good heuristic is to start
 646         * resolving deltas in the same order as their position in the pack.
 647         */
 648        sorted_by_pos = xmalloc(nr_unresolved * sizeof(*sorted_by_pos));
 649        for (i = 0; i < nr_deltas; i++) {
 650                if (objects[deltas[i].obj_no].real_type != OBJ_REF_DELTA)
 651                        continue;
 652                sorted_by_pos[n++] = &deltas[i];
 653        }
 654        qsort(sorted_by_pos, n, sizeof(*sorted_by_pos), delta_pos_compare);
 655
 656        for (i = 0; i < n; i++) {
 657                struct delta_entry *d = sorted_by_pos[i];
 658                void *data;
 659                unsigned long size;
 660                enum object_type type;
 661                int j, first, last;
 662
 663                if (objects[d->obj_no].real_type != OBJ_REF_DELTA)
 664                        continue;
 665                data = read_sha1_file(d->base.sha1, &type, &size);
 666                if (!data)
 667                        continue;
 668
 669                find_delta_children(&d->base, &first, &last);
 670                for (j = first; j <= last; j++) {
 671                        struct object_entry *child = objects + deltas[j].obj_no;
 672                        if (child->real_type == OBJ_REF_DELTA)
 673                                resolve_delta(child, data, size, type);
 674                }
 675
 676                if (check_sha1_signature(d->base.sha1, data, size, typename(type)))
 677                        die("local object %s is corrupt", sha1_to_hex(d->base.sha1));
 678                append_obj_to_pack(d->base.sha1, data, size, type);
 679                free(data);
 680                display_progress(progress, nr_resolved_deltas);
 681        }
 682        free(sorted_by_pos);
 683}
 684
 685static void final(const char *final_pack_name, const char *curr_pack_name,
 686                  const char *final_index_name, const char *curr_index_name,
 687                  const char *keep_name, const char *keep_msg,
 688                  unsigned char *sha1)
 689{
 690        const char *report = "pack";
 691        char name[PATH_MAX];
 692        int err;
 693
 694        if (!from_stdin) {
 695                close(input_fd);
 696        } else {
 697                err = close(output_fd);
 698                if (err)
 699                        die("error while closing pack file: %s", strerror(errno));
 700                chmod(curr_pack_name, 0444);
 701        }
 702
 703        if (keep_msg) {
 704                int keep_fd, keep_msg_len = strlen(keep_msg);
 705                if (!keep_name) {
 706                        snprintf(name, sizeof(name), "%s/pack/pack-%s.keep",
 707                                 get_object_directory(), sha1_to_hex(sha1));
 708                        keep_name = name;
 709                }
 710                keep_fd = open(keep_name, O_RDWR|O_CREAT|O_EXCL, 0600);
 711                if (keep_fd < 0) {
 712                        if (errno != EEXIST)
 713                                die("cannot write keep file");
 714                } else {
 715                        if (keep_msg_len > 0) {
 716                                write_or_die(keep_fd, keep_msg, keep_msg_len);
 717                                write_or_die(keep_fd, "\n", 1);
 718                        }
 719                        if (close(keep_fd) != 0)
 720                                die("cannot write keep file");
 721                        report = "keep";
 722                }
 723        }
 724
 725        if (final_pack_name != curr_pack_name) {
 726                if (!final_pack_name) {
 727                        snprintf(name, sizeof(name), "%s/pack/pack-%s.pack",
 728                                 get_object_directory(), sha1_to_hex(sha1));
 729                        final_pack_name = name;
 730                }
 731                if (move_temp_to_file(curr_pack_name, final_pack_name))
 732                        die("cannot store pack file");
 733        }
 734
 735        chmod(curr_index_name, 0444);
 736        if (final_index_name != curr_index_name) {
 737                if (!final_index_name) {
 738                        snprintf(name, sizeof(name), "%s/pack/pack-%s.idx",
 739                                 get_object_directory(), sha1_to_hex(sha1));
 740                        final_index_name = name;
 741                }
 742                if (move_temp_to_file(curr_index_name, final_index_name))
 743                        die("cannot store index file");
 744        }
 745
 746        if (!from_stdin) {
 747                printf("%s\n", sha1_to_hex(sha1));
 748        } else {
 749                char buf[48];
 750                int len = snprintf(buf, sizeof(buf), "%s\t%s\n",
 751                                   report, sha1_to_hex(sha1));
 752                write_or_die(1, buf, len);
 753
 754                /*
 755                 * Let's just mimic git-unpack-objects here and write
 756                 * the last part of the input buffer to stdout.
 757                 */
 758                while (input_len) {
 759                        err = xwrite(1, input_buffer + input_offset, input_len);
 760                        if (err <= 0)
 761                                break;
 762                        input_len -= err;
 763                        input_offset += err;
 764                }
 765        }
 766}
 767
 768static int git_index_pack_config(const char *k, const char *v, void *cb)
 769{
 770        if (!strcmp(k, "pack.indexversion")) {
 771                pack_idx_default_version = git_config_int(k, v);
 772                if (pack_idx_default_version > 2)
 773                        die("bad pack.indexversion=%d", pack_idx_default_version);
 774                return 0;
 775        }
 776        return git_default_config(k, v, cb);
 777}
 778
 779int main(int argc, char **argv)
 780{
 781        int i, fix_thin_pack = 0;
 782        char *curr_pack, *pack_name = NULL;
 783        char *curr_index, *index_name = NULL;
 784        const char *keep_name = NULL, *keep_msg = NULL;
 785        char *index_name_buf = NULL, *keep_name_buf = NULL;
 786        struct pack_idx_entry **idx_objects;
 787        unsigned char sha1[20];
 788
 789        git_config(git_index_pack_config, NULL);
 790
 791        for (i = 1; i < argc; i++) {
 792                char *arg = argv[i];
 793
 794                if (*arg == '-') {
 795                        if (!strcmp(arg, "--stdin")) {
 796                                from_stdin = 1;
 797                        } else if (!strcmp(arg, "--fix-thin")) {
 798                                fix_thin_pack = 1;
 799                        } else if (!strcmp(arg, "--strict")) {
 800                                strict = 1;
 801                        } else if (!strcmp(arg, "--keep")) {
 802                                keep_msg = "";
 803                        } else if (!prefixcmp(arg, "--keep=")) {
 804                                keep_msg = arg + 7;
 805                        } else if (!prefixcmp(arg, "--pack_header=")) {
 806                                struct pack_header *hdr;
 807                                char *c;
 808
 809                                hdr = (struct pack_header *)input_buffer;
 810                                hdr->hdr_signature = htonl(PACK_SIGNATURE);
 811                                hdr->hdr_version = htonl(strtoul(arg + 14, &c, 10));
 812                                if (*c != ',')
 813                                        die("bad %s", arg);
 814                                hdr->hdr_entries = htonl(strtoul(c + 1, &c, 10));
 815                                if (*c)
 816                                        die("bad %s", arg);
 817                                input_len = sizeof(*hdr);
 818                        } else if (!strcmp(arg, "-v")) {
 819                                verbose = 1;
 820                        } else if (!strcmp(arg, "-o")) {
 821                                if (index_name || (i+1) >= argc)
 822                                        usage(index_pack_usage);
 823                                index_name = argv[++i];
 824                        } else if (!prefixcmp(arg, "--index-version=")) {
 825                                char *c;
 826                                pack_idx_default_version = strtoul(arg + 16, &c, 10);
 827                                if (pack_idx_default_version > 2)
 828                                        die("bad %s", arg);
 829                                if (*c == ',')
 830                                        pack_idx_off32_limit = strtoul(c+1, &c, 0);
 831                                if (*c || pack_idx_off32_limit & 0x80000000)
 832                                        die("bad %s", arg);
 833                        } else
 834                                usage(index_pack_usage);
 835                        continue;
 836                }
 837
 838                if (pack_name)
 839                        usage(index_pack_usage);
 840                pack_name = arg;
 841        }
 842
 843        if (!pack_name && !from_stdin)
 844                usage(index_pack_usage);
 845        if (fix_thin_pack && !from_stdin)
 846                die("--fix-thin cannot be used without --stdin");
 847        if (!index_name && pack_name) {
 848                int len = strlen(pack_name);
 849                if (!has_extension(pack_name, ".pack"))
 850                        die("packfile name '%s' does not end with '.pack'",
 851                            pack_name);
 852                index_name_buf = xmalloc(len);
 853                memcpy(index_name_buf, pack_name, len - 5);
 854                strcpy(index_name_buf + len - 5, ".idx");
 855                index_name = index_name_buf;
 856        }
 857        if (keep_msg && !keep_name && pack_name) {
 858                int len = strlen(pack_name);
 859                if (!has_extension(pack_name, ".pack"))
 860                        die("packfile name '%s' does not end with '.pack'",
 861                            pack_name);
 862                keep_name_buf = xmalloc(len);
 863                memcpy(keep_name_buf, pack_name, len - 5);
 864                strcpy(keep_name_buf + len - 5, ".keep");
 865                keep_name = keep_name_buf;
 866        }
 867
 868        curr_pack = open_pack_file(pack_name);
 869        parse_pack_header();
 870        objects = xmalloc((nr_objects + 1) * sizeof(struct object_entry));
 871        deltas = xmalloc(nr_objects * sizeof(struct delta_entry));
 872        parse_pack_objects(sha1);
 873        if (nr_deltas == nr_resolved_deltas) {
 874                stop_progress(&progress);
 875                /* Flush remaining pack final 20-byte SHA1. */
 876                flush();
 877        } else {
 878                if (fix_thin_pack) {
 879                        char msg[48];
 880                        int nr_unresolved = nr_deltas - nr_resolved_deltas;
 881                        int nr_objects_initial = nr_objects;
 882                        if (nr_unresolved <= 0)
 883                                die("confusion beyond insanity");
 884                        objects = xrealloc(objects,
 885                                           (nr_objects + nr_unresolved + 1)
 886                                           * sizeof(*objects));
 887                        fix_unresolved_deltas(nr_unresolved);
 888                        sprintf(msg, "completed with %d local objects",
 889                                nr_objects - nr_objects_initial);
 890                        stop_progress_msg(&progress, msg);
 891                        fixup_pack_header_footer(output_fd, sha1,
 892                                                 curr_pack, nr_objects);
 893                }
 894                if (nr_deltas != nr_resolved_deltas)
 895                        die("pack has %d unresolved deltas",
 896                            nr_deltas - nr_resolved_deltas);
 897        }
 898        free(deltas);
 899        if (strict)
 900                check_objects();
 901
 902        idx_objects = xmalloc((nr_objects) * sizeof(struct pack_idx_entry *));
 903        for (i = 0; i < nr_objects; i++)
 904                idx_objects[i] = &objects[i].idx;
 905        curr_index = write_idx_file(index_name, idx_objects, nr_objects, sha1);
 906        free(idx_objects);
 907
 908        final(pack_name, curr_pack,
 909                index_name, curr_index,
 910                keep_name, keep_msg,
 911                sha1);
 912        free(objects);
 913        free(index_name_buf);
 914        free(keep_name_buf);
 915        if (pack_name == NULL)
 916                free(curr_pack);
 917        if (index_name == NULL)
 918                free(curr_index);
 919
 920        return 0;
 921}