Andrew's git - gitweb.git/blob

   1#include "cache.h"
   2#include "pack.h"
   3
   4static int verify_packfile(struct packed_git *p,
   5                struct pack_window **w_curs)
   6{
   7        off_t index_size = p->index_size;
   8        const unsigned char *index_base = p->index_data;
   9        SHA_CTX ctx;
  10        unsigned char sha1[20];
  11        off_t offset = 0, pack_sig = p->pack_size - 20;
  12        uint32_t nr_objects, i;
  13        int err;
  14
  15        /* Note that the pack header checks are actually performed by
  16         * use_pack when it first opens the pack file.  If anything
  17         * goes wrong during those checks then the call will die out
  18         * immediately.
  19         */
  20
  21        SHA1_Init(&ctx);
  22        while (offset < pack_sig) {
  23                unsigned int remaining;
  24                unsigned char *in = use_pack(p, w_curs, offset, &remaining);
  25                offset += remaining;
  26                if (offset > pack_sig)
  27                        remaining -= (unsigned int)(offset - pack_sig);
  28                SHA1_Update(&ctx, in, remaining);
  29        }
  30        SHA1_Final(sha1, &ctx);
  31        if (hashcmp(sha1, use_pack(p, w_curs, pack_sig, NULL)))
  32                return error("Packfile %s SHA1 mismatch with itself",
  33                             p->pack_name);
  34        if (hashcmp(sha1, index_base + index_size - 40))
  35                return error("Packfile %s SHA1 mismatch with idx",
  36                             p->pack_name);
  37        unuse_pack(w_curs);
  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        nr_objects = num_packed_objects(p);
  44        for (i = 0, err = 0; i < nr_objects; i++) {
  45                unsigned char sha1[20];
  46                void *data;
  47                enum object_type type;
  48                unsigned long size;
  49                off_t offset;
  50
  51                if (nth_packed_object_sha1(p, i, sha1))
  52                        die("internal error pack-check nth-packed-object");
  53                offset = find_pack_entry_one(sha1, p);
  54                if (!offset)
  55                        die("internal error pack-check find-pack-entry-one");
  56                data = unpack_entry(p, offset, &type, &size);
  57                if (!data) {
  58                        err = error("cannot unpack %s from %s",
  59                                    sha1_to_hex(sha1), p->pack_name);
  60                        continue;
  61                }
  62                if (check_sha1_signature(sha1, data, size, typename(type))) {
  63                        err = error("packed %s from %s is corrupt",
  64                                    sha1_to_hex(sha1), p->pack_name);
  65                        free(data);
  66                        continue;
  67                }
  68                free(data);
  69        }
  70
  71        return err;
  72}
  73
  74
  75#define MAX_CHAIN 40
  76
  77static void show_pack_info(struct packed_git *p)
  78{
  79        uint32_t nr_objects, i, chain_histogram[MAX_CHAIN];
  80
  81        nr_objects = num_packed_objects(p);
  82        memset(chain_histogram, 0, sizeof(chain_histogram));
  83
  84        for (i = 0; i < nr_objects; i++) {
  85                unsigned char sha1[20], base_sha1[20];
  86                const char *type;
  87                unsigned long size;
  88                unsigned long store_size;
  89                off_t offset;
  90                unsigned int delta_chain_length;
  91
  92                if (nth_packed_object_sha1(p, i, sha1))
  93                        die("internal error pack-check nth-packed-object");
  94                offset = find_pack_entry_one(sha1, p);
  95                if (!offset)
  96                        die("internal error pack-check find-pack-entry-one");
  97
  98                type = packed_object_info_detail(p, offset, &size, &store_size,
  99                                                 &delta_chain_length,
 100                                                 base_sha1);
 101                printf("%s ", sha1_to_hex(sha1));
 102                if (!delta_chain_length)
 103                        printf("%-6s %lu %"PRIuMAX"\n",
 104                               type, size, (uintmax_t)offset);
 105                else {
 106                        printf("%-6s %lu %"PRIuMAX" %u %s\n",
 107                               type, size, (uintmax_t)offset,
 108                               delta_chain_length, sha1_to_hex(base_sha1));
 109                        if (delta_chain_length < MAX_CHAIN)
 110                                chain_histogram[delta_chain_length]++;
 111                        else
 112                                chain_histogram[0]++;
 113                }
 114        }
 115
 116        for (i = 0; i < MAX_CHAIN; i++) {
 117                if (!chain_histogram[i])
 118                        continue;
 119                printf("chain length %s %d: %d object%s\n",
 120                       i ? "=" : ">=",
 121                       i ? i : MAX_CHAIN,
 122                       chain_histogram[i],
 123                       1 < chain_histogram[i] ? "s" : "");
 124        }
 125}
 126
 127int verify_pack(struct packed_git *p, int verbose)
 128{
 129        off_t index_size = p->index_size;
 130        const unsigned char *index_base = p->index_data;
 131        SHA_CTX ctx;
 132        unsigned char sha1[20];
 133        int ret;
 134
 135        ret = 0;
 136        /* Verify SHA1 sum of the index file */
 137        SHA1_Init(&ctx);
 138        SHA1_Update(&ctx, index_base, (unsigned int)(index_size - 20));
 139        SHA1_Final(sha1, &ctx);
 140        if (hashcmp(sha1, index_base + index_size - 20))
 141                ret = error("Packfile index for %s SHA1 mismatch",
 142                            p->pack_name);
 143
 144        if (!ret) {
 145                /* Verify pack file */
 146                struct pack_window *w_curs = NULL;
 147                ret = verify_packfile(p, &w_curs);
 148                unuse_pack(&w_curs);
 149        }
 150
 151        if (verbose) {
 152                if (ret)
 153                        printf("%s: bad\n", p->pack_name);
 154                else {
 155                        show_pack_info(p);
 156                        printf("%s: ok\n", p->pack_name);
 157                }
 158        }
 159
 160        return ret;
 161}