index-pack.con commit Merge branch 'ls/maint-mailinfo-patch-label' (abce32b)
   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 %"PRIu32" unsupported",
 194                        ntohl(hdr->hdr_version));
 195
 196        nr_objects = ntohl(hdr->hdr_entries);
 197        use(sizeof(struct pack_header));
 198}
 199
 200static void bad_object(unsigned long offset, const char *format,
 201                       ...) NORETURN __attribute__((format (printf, 2, 3)));
 202
 203static void bad_object(unsigned long offset, const char *format, ...)
 204{
 205        va_list params;
 206        char buf[1024];
 207
 208        va_start(params, format);
 209        vsnprintf(buf, sizeof(buf), format, params);
 210        va_end(params);
 211        die("pack has bad object at offset %lu: %s", offset, buf);
 212}
 213
 214static void *unpack_entry_data(unsigned long offset, unsigned long size)
 215{
 216        z_stream stream;
 217        void *buf = xmalloc(size);
 218
 219        memset(&stream, 0, sizeof(stream));
 220        stream.next_out = buf;
 221        stream.avail_out = size;
 222        stream.next_in = fill(1);
 223        stream.avail_in = input_len;
 224        inflateInit(&stream);
 225
 226        for (;;) {
 227                int ret = inflate(&stream, 0);
 228                use(input_len - stream.avail_in);
 229                if (stream.total_out == size && ret == Z_STREAM_END)
 230                        break;
 231                if (ret != Z_OK)
 232                        bad_object(offset, "inflate returned %d", ret);
 233                stream.next_in = fill(1);
 234                stream.avail_in = input_len;
 235        }
 236        inflateEnd(&stream);
 237        return buf;
 238}
 239
 240static void *unpack_raw_entry(struct object_entry *obj, union delta_base *delta_base)
 241{
 242        unsigned char *p, c;
 243        unsigned long size;
 244        off_t base_offset;
 245        unsigned shift;
 246        void *data;
 247
 248        obj->idx.offset = consumed_bytes;
 249        input_crc32 = crc32(0, Z_NULL, 0);
 250
 251        p = fill(1);
 252        c = *p;
 253        use(1);
 254        obj->type = (c >> 4) & 7;
 255        size = (c & 15);
 256        shift = 4;
 257        while (c & 0x80) {
 258                p = fill(1);
 259                c = *p;
 260                use(1);
 261                size += (c & 0x7fUL) << shift;
 262                shift += 7;
 263        }
 264        obj->size = size;
 265
 266        switch (obj->type) {
 267        case OBJ_REF_DELTA:
 268                hashcpy(delta_base->sha1, fill(20));
 269                use(20);
 270                break;
 271        case OBJ_OFS_DELTA:
 272                memset(delta_base, 0, sizeof(*delta_base));
 273                p = fill(1);
 274                c = *p;
 275                use(1);
 276                base_offset = c & 127;
 277                while (c & 128) {
 278                        base_offset += 1;
 279                        if (!base_offset || MSB(base_offset, 7))
 280                                bad_object(obj->idx.offset, "offset value overflow for delta base object");
 281                        p = fill(1);
 282                        c = *p;
 283                        use(1);
 284                        base_offset = (base_offset << 7) + (c & 127);
 285                }
 286                delta_base->offset = obj->idx.offset - base_offset;
 287                if (delta_base->offset >= obj->idx.offset)
 288                        bad_object(obj->idx.offset, "delta base offset is out of bound");
 289                break;
 290        case OBJ_COMMIT:
 291        case OBJ_TREE:
 292        case OBJ_BLOB:
 293        case OBJ_TAG:
 294                break;
 295        default:
 296                bad_object(obj->idx.offset, "unknown object type %d", obj->type);
 297        }
 298        obj->hdr_size = consumed_bytes - obj->idx.offset;
 299
 300        data = unpack_entry_data(obj->idx.offset, obj->size);
 301        obj->idx.crc32 = input_crc32;
 302        return data;
 303}
 304
 305static void *get_data_from_pack(struct object_entry *obj)
 306{
 307        off_t from = obj[0].idx.offset + obj[0].hdr_size;
 308        unsigned long len = obj[1].idx.offset - from;
 309        unsigned long rdy = 0;
 310        unsigned char *src, *data;
 311        z_stream stream;
 312        int st;
 313
 314        src = xmalloc(len);
 315        data = src;
 316        do {
 317                ssize_t n = pread(pack_fd, data + rdy, len - rdy, from + rdy);
 318                if (n <= 0)
 319                        die("cannot pread pack file: %s", strerror(errno));
 320                rdy += n;
 321        } while (rdy < len);
 322        data = xmalloc(obj->size);
 323        memset(&stream, 0, sizeof(stream));
 324        stream.next_out = data;
 325        stream.avail_out = obj->size;
 326        stream.next_in = src;
 327        stream.avail_in = len;
 328        inflateInit(&stream);
 329        while ((st = inflate(&stream, Z_FINISH)) == Z_OK);
 330        inflateEnd(&stream);
 331        if (st != Z_STREAM_END || stream.total_out != obj->size)
 332                die("serious inflate inconsistency");
 333        free(src);
 334        return data;
 335}
 336
 337static int find_delta(const union delta_base *base)
 338{
 339        int first = 0, last = nr_deltas;
 340
 341        while (first < last) {
 342                int next = (first + last) / 2;
 343                struct delta_entry *delta = &deltas[next];
 344                int cmp;
 345
 346                cmp = memcmp(base, &delta->base, UNION_BASE_SZ);
 347                if (!cmp)
 348                        return next;
 349                if (cmp < 0) {
 350                        last = next;
 351                        continue;
 352                }
 353                first = next+1;
 354        }
 355        return -first-1;
 356}
 357
 358static int find_delta_children(const union delta_base *base,
 359                               int *first_index, int *last_index)
 360{
 361        int first = find_delta(base);
 362        int last = first;
 363        int end = nr_deltas - 1;
 364
 365        if (first < 0)
 366                return -1;
 367        while (first > 0 && !memcmp(&deltas[first - 1].base, base, UNION_BASE_SZ))
 368                --first;
 369        while (last < end && !memcmp(&deltas[last + 1].base, base, UNION_BASE_SZ))
 370                ++last;
 371        *first_index = first;
 372        *last_index = last;
 373        return 0;
 374}
 375
 376static void sha1_object(const void *data, unsigned long size,
 377                        enum object_type type, unsigned char *sha1)
 378{
 379        hash_sha1_file(data, size, typename(type), sha1);
 380        if (has_sha1_file(sha1)) {
 381                void *has_data;
 382                enum object_type has_type;
 383                unsigned long has_size;
 384                has_data = read_sha1_file(sha1, &has_type, &has_size);
 385                if (!has_data)
 386                        die("cannot read existing object %s", sha1_to_hex(sha1));
 387                if (size != has_size || type != has_type ||
 388                    memcmp(data, has_data, size) != 0)
 389                        die("SHA1 COLLISION FOUND WITH %s !", sha1_to_hex(sha1));
 390                free(has_data);
 391        }
 392        if (strict) {
 393                if (type == OBJ_BLOB) {
 394                        struct blob *blob = lookup_blob(sha1);
 395                        if (blob)
 396                                blob->object.flags |= FLAG_CHECKED;
 397                        else
 398                                die("invalid blob object %s", sha1_to_hex(sha1));
 399                } else {
 400                        struct object *obj;
 401                        int eaten;
 402                        void *buf = (void *) data;
 403
 404                        /*
 405                         * we do not need to free the memory here, as the
 406                         * buf is deleted by the caller.
 407                         */
 408                        obj = parse_object_buffer(sha1, type, size, buf, &eaten);
 409                        if (!obj)
 410                                die("invalid %s", typename(type));
 411                        if (fsck_object(obj, 1, fsck_error_function))
 412                                die("Error in object");
 413                        if (fsck_walk(obj, mark_link, 0))
 414                                die("Not all child objects of %s are reachable", sha1_to_hex(obj->sha1));
 415
 416                        if (obj->type == OBJ_TREE) {
 417                                struct tree *item = (struct tree *) obj;
 418                                item->buffer = NULL;
 419                        }
 420                        if (obj->type == OBJ_COMMIT) {
 421                                struct commit *commit = (struct commit *) obj;
 422                                commit->buffer = NULL;
 423                        }
 424                        obj->flags |= FLAG_CHECKED;
 425                }
 426        }
 427}
 428
 429static void resolve_delta(struct object_entry *delta_obj, void *base_data,
 430                          unsigned long base_size, enum object_type type)
 431{
 432        void *delta_data;
 433        unsigned long delta_size;
 434        void *result;
 435        unsigned long result_size;
 436        union delta_base delta_base;
 437        int j, first, last;
 438
 439        delta_obj->real_type = type;
 440        delta_data = get_data_from_pack(delta_obj);
 441        delta_size = delta_obj->size;
 442        result = patch_delta(base_data, base_size, delta_data, delta_size,
 443                             &result_size);
 444        free(delta_data);
 445        if (!result)
 446                bad_object(delta_obj->idx.offset, "failed to apply delta");
 447        sha1_object(result, result_size, type, delta_obj->idx.sha1);
 448        nr_resolved_deltas++;
 449
 450        hashcpy(delta_base.sha1, delta_obj->idx.sha1);
 451        if (!find_delta_children(&delta_base, &first, &last)) {
 452                for (j = first; j <= last; j++) {
 453                        struct object_entry *child = objects + deltas[j].obj_no;
 454                        if (child->real_type == OBJ_REF_DELTA)
 455                                resolve_delta(child, result, result_size, type);
 456                }
 457        }
 458
 459        memset(&delta_base, 0, sizeof(delta_base));
 460        delta_base.offset = delta_obj->idx.offset;
 461        if (!find_delta_children(&delta_base, &first, &last)) {
 462                for (j = first; j <= last; j++) {
 463                        struct object_entry *child = objects + deltas[j].obj_no;
 464                        if (child->real_type == OBJ_OFS_DELTA)
 465                                resolve_delta(child, result, result_size, type);
 466                }
 467        }
 468
 469        free(result);
 470}
 471
 472static int compare_delta_entry(const void *a, const void *b)
 473{
 474        const struct delta_entry *delta_a = a;
 475        const struct delta_entry *delta_b = b;
 476        return memcmp(&delta_a->base, &delta_b->base, UNION_BASE_SZ);
 477}
 478
 479/* Parse all objects and return the pack content SHA1 hash */
 480static void parse_pack_objects(unsigned char *sha1)
 481{
 482        int i;
 483        struct delta_entry *delta = deltas;
 484        void *data;
 485        struct stat st;
 486
 487        /*
 488         * First pass:
 489         * - find locations of all objects;
 490         * - calculate SHA1 of all non-delta objects;
 491         * - remember base (SHA1 or offset) for all deltas.
 492         */
 493        if (verbose)
 494                progress = start_progress(
 495                                from_stdin ? "Receiving objects" : "Indexing objects",
 496                                nr_objects);
 497        for (i = 0; i < nr_objects; i++) {
 498                struct object_entry *obj = &objects[i];
 499                data = unpack_raw_entry(obj, &delta->base);
 500                obj->real_type = obj->type;
 501                if (obj->type == OBJ_REF_DELTA || obj->type == OBJ_OFS_DELTA) {
 502                        nr_deltas++;
 503                        delta->obj_no = i;
 504                        delta++;
 505                } else
 506                        sha1_object(data, obj->size, obj->type, obj->idx.sha1);
 507                free(data);
 508                display_progress(progress, i+1);
 509        }
 510        objects[i].idx.offset = consumed_bytes;
 511        stop_progress(&progress);
 512
 513        /* Check pack integrity */
 514        flush();
 515        SHA1_Final(sha1, &input_ctx);
 516        if (hashcmp(fill(20), sha1))
 517                die("pack is corrupted (SHA1 mismatch)");
 518        use(20);
 519
 520        /* If input_fd is a file, we should have reached its end now. */
 521        if (fstat(input_fd, &st))
 522                die("cannot fstat packfile: %s", strerror(errno));
 523        if (S_ISREG(st.st_mode) &&
 524                        lseek(input_fd, 0, SEEK_CUR) - input_len != st.st_size)
 525                die("pack has junk at the end");
 526
 527        if (!nr_deltas)
 528                return;
 529
 530        /* Sort deltas by base SHA1/offset for fast searching */
 531        qsort(deltas, nr_deltas, sizeof(struct delta_entry),
 532              compare_delta_entry);
 533
 534        /*
 535         * Second pass:
 536         * - for all non-delta objects, look if it is used as a base for
 537         *   deltas;
 538         * - if used as a base, uncompress the object and apply all deltas,
 539         *   recursively checking if the resulting object is used as a base
 540         *   for some more deltas.
 541         */
 542        if (verbose)
 543                progress = start_progress("Resolving deltas", nr_deltas);
 544        for (i = 0; i < nr_objects; i++) {
 545                struct object_entry *obj = &objects[i];
 546                union delta_base base;
 547                int j, ref, ref_first, ref_last, ofs, ofs_first, ofs_last;
 548
 549                if (obj->type == OBJ_REF_DELTA || obj->type == OBJ_OFS_DELTA)
 550                        continue;
 551                hashcpy(base.sha1, obj->idx.sha1);
 552                ref = !find_delta_children(&base, &ref_first, &ref_last);
 553                memset(&base, 0, sizeof(base));
 554                base.offset = obj->idx.offset;
 555                ofs = !find_delta_children(&base, &ofs_first, &ofs_last);
 556                if (!ref && !ofs)
 557                        continue;
 558                data = get_data_from_pack(obj);
 559                if (ref)
 560                        for (j = ref_first; j <= ref_last; j++) {
 561                                struct object_entry *child = objects + deltas[j].obj_no;
 562                                if (child->real_type == OBJ_REF_DELTA)
 563                                        resolve_delta(child, data,
 564                                                      obj->size, obj->type);
 565                        }
 566                if (ofs)
 567                        for (j = ofs_first; j <= ofs_last; j++) {
 568                                struct object_entry *child = objects + deltas[j].obj_no;
 569                                if (child->real_type == OBJ_OFS_DELTA)
 570                                        resolve_delta(child, data,
 571                                                      obj->size, obj->type);
 572                        }
 573                free(data);
 574                display_progress(progress, nr_resolved_deltas);
 575        }
 576}
 577
 578static int write_compressed(int fd, void *in, unsigned int size, uint32_t *obj_crc)
 579{
 580        z_stream stream;
 581        unsigned long maxsize;
 582        void *out;
 583
 584        memset(&stream, 0, sizeof(stream));
 585        deflateInit(&stream, zlib_compression_level);
 586        maxsize = deflateBound(&stream, size);
 587        out = xmalloc(maxsize);
 588
 589        /* Compress it */
 590        stream.next_in = in;
 591        stream.avail_in = size;
 592        stream.next_out = out;
 593        stream.avail_out = maxsize;
 594        while (deflate(&stream, Z_FINISH) == Z_OK);
 595        deflateEnd(&stream);
 596
 597        size = stream.total_out;
 598        write_or_die(fd, out, size);
 599        *obj_crc = crc32(*obj_crc, out, size);
 600        free(out);
 601        return size;
 602}
 603
 604static void append_obj_to_pack(const unsigned char *sha1, void *buf,
 605                               unsigned long size, enum object_type type)
 606{
 607        struct object_entry *obj = &objects[nr_objects++];
 608        unsigned char header[10];
 609        unsigned long s = size;
 610        int n = 0;
 611        unsigned char c = (type << 4) | (s & 15);
 612        s >>= 4;
 613        while (s) {
 614                header[n++] = c | 0x80;
 615                c = s & 0x7f;
 616                s >>= 7;
 617        }
 618        header[n++] = c;
 619        write_or_die(output_fd, header, n);
 620        obj[0].idx.crc32 = crc32(0, Z_NULL, 0);
 621        obj[0].idx.crc32 = crc32(obj[0].idx.crc32, header, n);
 622        obj[1].idx.offset = obj[0].idx.offset + n;
 623        obj[1].idx.offset += write_compressed(output_fd, buf, size, &obj[0].idx.crc32);
 624        hashcpy(obj->idx.sha1, sha1);
 625}
 626
 627static int delta_pos_compare(const void *_a, const void *_b)
 628{
 629        struct delta_entry *a = *(struct delta_entry **)_a;
 630        struct delta_entry *b = *(struct delta_entry **)_b;
 631        return a->obj_no - b->obj_no;
 632}
 633
 634static void fix_unresolved_deltas(int nr_unresolved)
 635{
 636        struct delta_entry **sorted_by_pos;
 637        int i, n = 0;
 638
 639        /*
 640         * Since many unresolved deltas may well be themselves base objects
 641         * for more unresolved deltas, we really want to include the
 642         * smallest number of base objects that would cover as much delta
 643         * as possible by picking the
 644         * trunc deltas first, allowing for other deltas to resolve without
 645         * additional base objects.  Since most base objects are to be found
 646         * before deltas depending on them, a good heuristic is to start
 647         * resolving deltas in the same order as their position in the pack.
 648         */
 649        sorted_by_pos = xmalloc(nr_unresolved * sizeof(*sorted_by_pos));
 650        for (i = 0; i < nr_deltas; i++) {
 651                if (objects[deltas[i].obj_no].real_type != OBJ_REF_DELTA)
 652                        continue;
 653                sorted_by_pos[n++] = &deltas[i];
 654        }
 655        qsort(sorted_by_pos, n, sizeof(*sorted_by_pos), delta_pos_compare);
 656
 657        for (i = 0; i < n; i++) {
 658                struct delta_entry *d = sorted_by_pos[i];
 659                void *data;
 660                unsigned long size;
 661                enum object_type type;
 662                int j, first, last;
 663
 664                if (objects[d->obj_no].real_type != OBJ_REF_DELTA)
 665                        continue;
 666                data = read_sha1_file(d->base.sha1, &type, &size);
 667                if (!data)
 668                        continue;
 669
 670                find_delta_children(&d->base, &first, &last);
 671                for (j = first; j <= last; j++) {
 672                        struct object_entry *child = objects + deltas[j].obj_no;
 673                        if (child->real_type == OBJ_REF_DELTA)
 674                                resolve_delta(child, data, size, type);
 675                }
 676
 677                if (check_sha1_signature(d->base.sha1, data, size, typename(type)))
 678                        die("local object %s is corrupt", sha1_to_hex(d->base.sha1));
 679                append_obj_to_pack(d->base.sha1, data, size, type);
 680                free(data);
 681                display_progress(progress, nr_resolved_deltas);
 682        }
 683        free(sorted_by_pos);
 684}
 685
 686static void final(const char *final_pack_name, const char *curr_pack_name,
 687                  const char *final_index_name, const char *curr_index_name,
 688                  const char *keep_name, const char *keep_msg,
 689                  unsigned char *sha1)
 690{
 691        const char *report = "pack";
 692        char name[PATH_MAX];
 693        int err;
 694
 695        if (!from_stdin) {
 696                close(input_fd);
 697        } else {
 698                fsync_or_die(output_fd, curr_pack_name);
 699                err = close(output_fd);
 700                if (err)
 701                        die("error while closing pack file: %s", strerror(errno));
 702                chmod(curr_pack_name, 0444);
 703        }
 704
 705        if (keep_msg) {
 706                int keep_fd, keep_msg_len = strlen(keep_msg);
 707                if (!keep_name) {
 708                        snprintf(name, sizeof(name), "%s/pack/pack-%s.keep",
 709                                 get_object_directory(), sha1_to_hex(sha1));
 710                        keep_name = name;
 711                }
 712                keep_fd = open(keep_name, O_RDWR|O_CREAT|O_EXCL, 0600);
 713                if (keep_fd < 0) {
 714                        if (errno != EEXIST)
 715                                die("cannot write keep file");
 716                } else {
 717                        if (keep_msg_len > 0) {
 718                                write_or_die(keep_fd, keep_msg, keep_msg_len);
 719                                write_or_die(keep_fd, "\n", 1);
 720                        }
 721                        if (close(keep_fd) != 0)
 722                                die("cannot write keep file");
 723                        report = "keep";
 724                }
 725        }
 726
 727        if (final_pack_name != curr_pack_name) {
 728                if (!final_pack_name) {
 729                        snprintf(name, sizeof(name), "%s/pack/pack-%s.pack",
 730                                 get_object_directory(), sha1_to_hex(sha1));
 731                        final_pack_name = name;
 732                }
 733                if (move_temp_to_file(curr_pack_name, final_pack_name))
 734                        die("cannot store pack file");
 735        }
 736
 737        chmod(curr_index_name, 0444);
 738        if (final_index_name != curr_index_name) {
 739                if (!final_index_name) {
 740                        snprintf(name, sizeof(name), "%s/pack/pack-%s.idx",
 741                                 get_object_directory(), sha1_to_hex(sha1));
 742                        final_index_name = name;
 743                }
 744                if (move_temp_to_file(curr_index_name, final_index_name))
 745                        die("cannot store index file");
 746        }
 747
 748        if (!from_stdin) {
 749                printf("%s\n", sha1_to_hex(sha1));
 750        } else {
 751                char buf[48];
 752                int len = snprintf(buf, sizeof(buf), "%s\t%s\n",
 753                                   report, sha1_to_hex(sha1));
 754                write_or_die(1, buf, len);
 755
 756                /*
 757                 * Let's just mimic git-unpack-objects here and write
 758                 * the last part of the input buffer to stdout.
 759                 */
 760                while (input_len) {
 761                        err = xwrite(1, input_buffer + input_offset, input_len);
 762                        if (err <= 0)
 763                                break;
 764                        input_len -= err;
 765                        input_offset += err;
 766                }
 767        }
 768}
 769
 770static int git_index_pack_config(const char *k, const char *v, void *cb)
 771{
 772        if (!strcmp(k, "pack.indexversion")) {
 773                pack_idx_default_version = git_config_int(k, v);
 774                if (pack_idx_default_version > 2)
 775                        die("bad pack.indexversion=%"PRIu32,
 776                                pack_idx_default_version);
 777                return 0;
 778        }
 779        return git_default_config(k, v, cb);
 780}
 781
 782int main(int argc, char **argv)
 783{
 784        int i, fix_thin_pack = 0;
 785        char *curr_pack, *pack_name = NULL;
 786        char *curr_index, *index_name = NULL;
 787        const char *keep_name = NULL, *keep_msg = NULL;
 788        char *index_name_buf = NULL, *keep_name_buf = NULL;
 789        struct pack_idx_entry **idx_objects;
 790        unsigned char sha1[20];
 791
 792        git_config(git_index_pack_config, NULL);
 793
 794        for (i = 1; i < argc; i++) {
 795                char *arg = argv[i];
 796
 797                if (*arg == '-') {
 798                        if (!strcmp(arg, "--stdin")) {
 799                                from_stdin = 1;
 800                        } else if (!strcmp(arg, "--fix-thin")) {
 801                                fix_thin_pack = 1;
 802                        } else if (!strcmp(arg, "--strict")) {
 803                                strict = 1;
 804                        } else if (!strcmp(arg, "--keep")) {
 805                                keep_msg = "";
 806                        } else if (!prefixcmp(arg, "--keep=")) {
 807                                keep_msg = arg + 7;
 808                        } else if (!prefixcmp(arg, "--pack_header=")) {
 809                                struct pack_header *hdr;
 810                                char *c;
 811
 812                                hdr = (struct pack_header *)input_buffer;
 813                                hdr->hdr_signature = htonl(PACK_SIGNATURE);
 814                                hdr->hdr_version = htonl(strtoul(arg + 14, &c, 10));
 815                                if (*c != ',')
 816                                        die("bad %s", arg);
 817                                hdr->hdr_entries = htonl(strtoul(c + 1, &c, 10));
 818                                if (*c)
 819                                        die("bad %s", arg);
 820                                input_len = sizeof(*hdr);
 821                        } else if (!strcmp(arg, "-v")) {
 822                                verbose = 1;
 823                        } else if (!strcmp(arg, "-o")) {
 824                                if (index_name || (i+1) >= argc)
 825                                        usage(index_pack_usage);
 826                                index_name = argv[++i];
 827                        } else if (!prefixcmp(arg, "--index-version=")) {
 828                                char *c;
 829                                pack_idx_default_version = strtoul(arg + 16, &c, 10);
 830                                if (pack_idx_default_version > 2)
 831                                        die("bad %s", arg);
 832                                if (*c == ',')
 833                                        pack_idx_off32_limit = strtoul(c+1, &c, 0);
 834                                if (*c || pack_idx_off32_limit & 0x80000000)
 835                                        die("bad %s", arg);
 836                        } else
 837                                usage(index_pack_usage);
 838                        continue;
 839                }
 840
 841                if (pack_name)
 842                        usage(index_pack_usage);
 843                pack_name = arg;
 844        }
 845
 846        if (!pack_name && !from_stdin)
 847                usage(index_pack_usage);
 848        if (fix_thin_pack && !from_stdin)
 849                die("--fix-thin cannot be used without --stdin");
 850        if (!index_name && pack_name) {
 851                int len = strlen(pack_name);
 852                if (!has_extension(pack_name, ".pack"))
 853                        die("packfile name '%s' does not end with '.pack'",
 854                            pack_name);
 855                index_name_buf = xmalloc(len);
 856                memcpy(index_name_buf, pack_name, len - 5);
 857                strcpy(index_name_buf + len - 5, ".idx");
 858                index_name = index_name_buf;
 859        }
 860        if (keep_msg && !keep_name && pack_name) {
 861                int len = strlen(pack_name);
 862                if (!has_extension(pack_name, ".pack"))
 863                        die("packfile name '%s' does not end with '.pack'",
 864                            pack_name);
 865                keep_name_buf = xmalloc(len);
 866                memcpy(keep_name_buf, pack_name, len - 5);
 867                strcpy(keep_name_buf + len - 5, ".keep");
 868                keep_name = keep_name_buf;
 869        }
 870
 871        curr_pack = open_pack_file(pack_name);
 872        parse_pack_header();
 873        objects = xmalloc((nr_objects + 1) * sizeof(struct object_entry));
 874        deltas = xmalloc(nr_objects * sizeof(struct delta_entry));
 875        parse_pack_objects(sha1);
 876        if (nr_deltas == nr_resolved_deltas) {
 877                stop_progress(&progress);
 878                /* Flush remaining pack final 20-byte SHA1. */
 879                flush();
 880        } else {
 881                if (fix_thin_pack) {
 882                        char msg[48];
 883                        int nr_unresolved = nr_deltas - nr_resolved_deltas;
 884                        int nr_objects_initial = nr_objects;
 885                        if (nr_unresolved <= 0)
 886                                die("confusion beyond insanity");
 887                        objects = xrealloc(objects,
 888                                           (nr_objects + nr_unresolved + 1)
 889                                           * sizeof(*objects));
 890                        fix_unresolved_deltas(nr_unresolved);
 891                        sprintf(msg, "completed with %d local objects",
 892                                nr_objects - nr_objects_initial);
 893                        stop_progress_msg(&progress, msg);
 894                        fixup_pack_header_footer(output_fd, sha1,
 895                                                 curr_pack, nr_objects);
 896                }
 897                if (nr_deltas != nr_resolved_deltas)
 898                        die("pack has %d unresolved deltas",
 899                            nr_deltas - nr_resolved_deltas);
 900        }
 901        free(deltas);
 902        if (strict)
 903                check_objects();
 904
 905        idx_objects = xmalloc((nr_objects) * sizeof(struct pack_idx_entry *));
 906        for (i = 0; i < nr_objects; i++)
 907                idx_objects[i] = &objects[i].idx;
 908        curr_index = write_idx_file(index_name, idx_objects, nr_objects, sha1);
 909        free(idx_objects);
 910
 911        final(pack_name, curr_pack,
 912                index_name, curr_index,
 913                keep_name, keep_msg,
 914                sha1);
 915        free(objects);
 916        free(index_name_buf);
 917        free(keep_name_buf);
 918        if (pack_name == NULL)
 919                free(curr_pack);
 920        if (index_name == NULL)
 921                free(curr_index);
 922
 923        return 0;
 924}