Andrew's git - gitweb.git/blob

9c723972b7081df1b893f1c79b075166fa0f0752
   1#include "cache.h"
   2#include "pack.h"
   3
   4static int verify_packfile(struct packed_git *p)
   5{
   6        unsigned long index_size = p->index_size;
   7        void *index_base = p->index_base;
   8        SHA_CTX ctx;
   9        unsigned char sha1[20];
  10        unsigned long pack_size = p->pack_size;
  11        void *pack_base;
  12        struct pack_header *hdr;
  13        int nr_objects, err, i;
  14
  15        /* Header consistency check */
  16        hdr = p->pack_base;
  17        if (hdr->hdr_signature != htonl(PACK_SIGNATURE))
  18                return error("Packfile signature mismatch", p->pack_name);
  19        if (hdr->hdr_version != htonl(PACK_VERSION))
  20                return error("Packfile version %d different from ours %d",
  21                             ntohl(hdr->hdr_version), PACK_VERSION);
  22        nr_objects = ntohl(hdr->hdr_entries);
  23        if (num_packed_objects(p) != nr_objects)
  24                return error("Packfile claims to have %d objects, "
  25                             "while idx size expects %d", nr_objects,
  26                             num_packed_objects(p));
  27
  28        SHA1_Init(&ctx);
  29        pack_base = p->pack_base;
  30        SHA1_Update(&ctx, pack_base, pack_size - 20);
  31        SHA1_Final(sha1, &ctx);
  32        if (memcmp(sha1, index_base + index_size - 40, 20))
  33                return error("Packfile %s SHA1 mismatch with idx",
  34                             p->pack_name);
  35        if (memcmp(sha1, pack_base + pack_size - 20, 20))
  36                return error("Packfile %s SHA1 mismatch with itself",
  37                             p->pack_name);
  38
  39        /* Make sure everything reachable from idx is valid.  Since we
  40         * have verified that nr_objects matches between idx and pack,
  41         * we do not do scan-streaming check on the pack file.
  42         */
  43        for (i = err = 0; i < nr_objects; i++) {
  44                unsigned char sha1[20];
  45                struct pack_entry e;
  46                void *data;
  47                char type[20];
  48                unsigned long size;
  49
  50                if (nth_packed_object_sha1(p, i, sha1))
  51                        die("internal error pack-check nth-packed-object");
  52                if (!find_pack_entry_one(sha1, &e, p))
  53                        die("internal error pack-check find-pack-entry-one");
  54                data = unpack_entry_gently(&e, type, &size);
  55                if (!data) {
  56                        err = error("cannot unpack %s from %s",
  57                                    sha1_to_hex(sha1), p->pack_name);
  58                        continue;
  59                }
  60                if (check_sha1_signature(sha1, data, size, type)) {
  61                        err = error("cannot packed %s from %s corrupt",
  62                                    sha1_to_hex(sha1), p->pack_name);
  63                        free(data);
  64                        continue;
  65                }
  66                free(data);
  67        }
  68
  69        return err;
  70}
  71
  72
  73static void show_pack_info(struct packed_git *p)
  74{
  75        /* Next round */
  76}
  77
  78int verify_pack(struct packed_git *p, int verbose)
  79{
  80        unsigned long index_size = p->index_size;
  81        void *index_base = p->index_base;
  82        SHA_CTX ctx;
  83        unsigned char sha1[20];
  84        int ret;
  85
  86        ret = 0;
  87        /* Verify SHA1 sum of the index file */
  88        SHA1_Init(&ctx);
  89        SHA1_Update(&ctx, index_base, index_size - 20);
  90        SHA1_Final(sha1, &ctx);
  91        if (memcmp(sha1, index_base + index_size - 20, 20))
  92                ret = error("Packfile index for %s SHA1 mismatch",
  93                            p->pack_name);
  94
  95        if (!ret) {
  96                /* Verify pack file */
  97                use_packed_git(p);
  98                ret = verify_packfile(p);
  99                unuse_packed_git(p);
 100        }
 101
 102        if (verbose) {
 103                if (ret)
 104                        printf("%s: bad\n", p->pack_name);
 105                else {
 106                        show_pack_info(p);
 107                        printf("%s: ok\n", p->pack_name);
 108                }
 109        }
 110
 111        return ret;
 112}