pack-check.con commit GIT 1.5.5.6 (f23ffbe)
   1#include "cache.h"
   2#include "pack.h"
   3#include "pack-revindex.h"
   4
   5struct idx_entry
   6{
   7        const unsigned char *sha1;
   8        off_t                offset;
   9};
  10
  11static int compare_entries(const void *e1, const void *e2)
  12{
  13        const struct idx_entry *entry1 = e1;
  14        const struct idx_entry *entry2 = e2;
  15        if (entry1->offset < entry2->offset)
  16                return -1;
  17        if (entry1->offset > entry2->offset)
  18                return 1;
  19        return 0;
  20}
  21
  22static int verify_packfile(struct packed_git *p,
  23                struct pack_window **w_curs)
  24{
  25        off_t index_size = p->index_size;
  26        const unsigned char *index_base = p->index_data;
  27        SHA_CTX ctx;
  28        unsigned char sha1[20];
  29        off_t offset = 0, pack_sig = p->pack_size - 20;
  30        uint32_t nr_objects, i;
  31        int err;
  32        struct idx_entry *entries;
  33
  34        /* Note that the pack header checks are actually performed by
  35         * use_pack when it first opens the pack file.  If anything
  36         * goes wrong during those checks then the call will die out
  37         * immediately.
  38         */
  39
  40        SHA1_Init(&ctx);
  41        while (offset < pack_sig) {
  42                unsigned int remaining;
  43                unsigned char *in = use_pack(p, w_curs, offset, &remaining);
  44                offset += remaining;
  45                if (offset > pack_sig)
  46                        remaining -= (unsigned int)(offset - pack_sig);
  47                SHA1_Update(&ctx, in, remaining);
  48        }
  49        SHA1_Final(sha1, &ctx);
  50        if (hashcmp(sha1, use_pack(p, w_curs, pack_sig, NULL)))
  51                return error("Packfile %s SHA1 mismatch with itself",
  52                             p->pack_name);
  53        if (hashcmp(sha1, index_base + index_size - 40))
  54                return error("Packfile %s SHA1 mismatch with idx",
  55                             p->pack_name);
  56        unuse_pack(w_curs);
  57
  58        /* Make sure everything reachable from idx is valid.  Since we
  59         * have verified that nr_objects matches between idx and pack,
  60         * we do not do scan-streaming check on the pack file.
  61         */
  62        nr_objects = p->num_objects;
  63        entries = xmalloc(nr_objects * sizeof(*entries));
  64        /* first sort entries by pack offset, since unpacking them is more efficient that way */
  65        for (i = 0; i < nr_objects; i++) {
  66                entries[i].sha1 = nth_packed_object_sha1(p, i);
  67                if (!entries[i].sha1)
  68                        die("internal error pack-check nth-packed-object");
  69                entries[i].offset = find_pack_entry_one(entries[i].sha1, p);
  70                if (!entries[i].offset)
  71                        die("internal error pack-check find-pack-entry-one");
  72        }
  73        qsort(entries, nr_objects, sizeof(*entries), compare_entries);
  74
  75        for (i = 0, err = 0; i < nr_objects; i++) {
  76                void *data;
  77                enum object_type type;
  78                unsigned long size;
  79
  80                data = unpack_entry(p, entries[i].offset, &type, &size);
  81                if (!data) {
  82                        err = error("cannot unpack %s from %s",
  83                                    sha1_to_hex(entries[i].sha1), p->pack_name);
  84                        continue;
  85                }
  86                if (check_sha1_signature(entries[i].sha1, data, size, typename(type))) {
  87                        err = error("packed %s from %s is corrupt",
  88                                    sha1_to_hex(entries[i].sha1), p->pack_name);
  89                        free(data);
  90                        continue;
  91                }
  92                free(data);
  93        }
  94        free(entries);
  95
  96        return err;
  97}
  98
  99
 100#define MAX_CHAIN 50
 101
 102static void show_pack_info(struct packed_git *p)
 103{
 104        uint32_t nr_objects, i, chain_histogram[MAX_CHAIN+1];
 105
 106        nr_objects = p->num_objects;
 107        memset(chain_histogram, 0, sizeof(chain_histogram));
 108        init_pack_revindex();
 109
 110        for (i = 0; i < nr_objects; i++) {
 111                const unsigned char *sha1;
 112                unsigned char base_sha1[20];
 113                const char *type;
 114                unsigned long size;
 115                unsigned long store_size;
 116                off_t offset;
 117                unsigned int delta_chain_length;
 118
 119                sha1 = nth_packed_object_sha1(p, i);
 120                if (!sha1)
 121                        die("internal error pack-check nth-packed-object");
 122                offset = find_pack_entry_one(sha1, p);
 123                if (!offset)
 124                        die("internal error pack-check find-pack-entry-one");
 125
 126                type = packed_object_info_detail(p, offset, &size, &store_size,
 127                                                 &delta_chain_length,
 128                                                 base_sha1);
 129                printf("%s ", sha1_to_hex(sha1));
 130                if (!delta_chain_length)
 131                        printf("%-6s %lu %lu %"PRIuMAX"\n",
 132                               type, size, store_size, (uintmax_t)offset);
 133                else {
 134                        printf("%-6s %lu %lu %"PRIuMAX" %u %s\n",
 135                               type, size, store_size, (uintmax_t)offset,
 136                               delta_chain_length, sha1_to_hex(base_sha1));
 137                        if (delta_chain_length <= MAX_CHAIN)
 138                                chain_histogram[delta_chain_length]++;
 139                        else
 140                                chain_histogram[0]++;
 141                }
 142        }
 143
 144        for (i = 0; i <= MAX_CHAIN; i++) {
 145                if (!chain_histogram[i])
 146                        continue;
 147                printf("chain length = %d: %d object%s\n", i,
 148                       chain_histogram[i], chain_histogram[i] > 1 ? "s" : "");
 149        }
 150        if (chain_histogram[0])
 151                printf("chain length > %d: %d object%s\n", MAX_CHAIN,
 152                       chain_histogram[0], chain_histogram[0] > 1 ? "s" : "");
 153}
 154
 155int verify_pack(struct packed_git *p, int verbose)
 156{
 157        off_t index_size;
 158        const unsigned char *index_base;
 159        SHA_CTX ctx;
 160        unsigned char sha1[20];
 161        int ret;
 162
 163        if (open_pack_index(p))
 164                return error("packfile %s index not opened", p->pack_name);
 165        index_size = p->index_size;
 166        index_base = p->index_data;
 167
 168        ret = 0;
 169        /* Verify SHA1 sum of the index file */
 170        SHA1_Init(&ctx);
 171        SHA1_Update(&ctx, index_base, (unsigned int)(index_size - 20));
 172        SHA1_Final(sha1, &ctx);
 173        if (hashcmp(sha1, index_base + index_size - 20))
 174                ret = error("Packfile index for %s SHA1 mismatch",
 175                            p->pack_name);
 176
 177        if (!ret) {
 178                /* Verify pack file */
 179                struct pack_window *w_curs = NULL;
 180                ret = verify_packfile(p, &w_curs);
 181                unuse_pack(&w_curs);
 182        }
 183
 184        if (verbose) {
 185                if (ret)
 186                        printf("%s: bad\n", p->pack_name);
 187                else {
 188                        show_pack_info(p);
 189                        printf("%s: ok\n", p->pack_name);
 190                }
 191        }
 192
 193        return ret;
 194}