Andrew's git - gitweb.git/blob

   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 %s signature mismatch", p->pack_name);
  19        if (!pack_version_ok(hdr->hdr_version))
  20                return error("Packfile version %d unsupported",
  21                             ntohl(hdr->hdr_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("packed %s from %s is 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        struct pack_header *hdr;
  76        int nr_objects, i;
  77
  78        hdr = p->pack_base;
  79        nr_objects = ntohl(hdr->hdr_entries);
  80
  81        for (i = 0; i < nr_objects; i++) {
  82                unsigned char sha1[20], base_sha1[20];
  83                struct pack_entry e;
  84                char type[20];
  85                unsigned long size;
  86                unsigned long store_size;
  87                unsigned int delta_chain_length;
  88
  89                if (nth_packed_object_sha1(p, i, sha1))
  90                        die("internal error pack-check nth-packed-object");
  91                if (!find_pack_entry_one(sha1, &e, p))
  92                        die("internal error pack-check find-pack-entry-one");
  93
  94                packed_object_info_detail(&e, type, &size, &store_size,
  95                                          &delta_chain_length,
  96                                          base_sha1);
  97                printf("%s ", sha1_to_hex(sha1));
  98                if (!delta_chain_length)
  99                        printf("%-6s %lu %u\n", type, size, e.offset);
 100                else
 101                        printf("%-6s %lu %u %u %s\n", type, size, e.offset,
 102                               delta_chain_length, sha1_to_hex(base_sha1));
 103        }
 104
 105}
 106
 107int verify_pack(struct packed_git *p, int verbose)
 108{
 109        unsigned long index_size = p->index_size;
 110        void *index_base = p->index_base;
 111        SHA_CTX ctx;
 112        unsigned char sha1[20];
 113        int ret;
 114
 115        ret = 0;
 116        /* Verify SHA1 sum of the index file */
 117        SHA1_Init(&ctx);
 118        SHA1_Update(&ctx, index_base, index_size - 20);
 119        SHA1_Final(sha1, &ctx);
 120        if (memcmp(sha1, index_base + index_size - 20, 20))
 121                ret = error("Packfile index for %s SHA1 mismatch",
 122                            p->pack_name);
 123
 124        if (!ret) {
 125                /* Verify pack file */
 126                use_packed_git(p);
 127                ret = verify_packfile(p);
 128                unuse_packed_git(p);
 129        }
 130
 131        if (verbose) {
 132                if (ret)
 133                        printf("%s: bad\n", p->pack_name);
 134                else {
 135                        use_packed_git(p);
 136                        show_pack_info(p);
 137                        unuse_packed_git(p);
 138                        printf("%s: ok\n", p->pack_name);
 139                }
 140        }
 141
 142        return ret;
 143}