Skip to content
This repository

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
tag: v1.5.0.2
Fetching contributors…

Octocat-spinner-32-eaf2f5

Cannot retrieve contributors at this time

file 159 lines (139 sloc) 4.178 kb
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158
#include "cache.h"
#include "pack.h"

static int verify_packfile(struct packed_git *p,
struct pack_window **w_curs)
{
unsigned long index_size = p->index_size;
void *index_base = p->index_base;
SHA_CTX ctx;
unsigned char sha1[20];
unsigned long offset = 0, pack_sig = p->pack_size - 20;
int nr_objects, err, i;

/* Note that the pack header checks are actually performed by
* use_pack when it first opens the pack file. If anything
* goes wrong during those checks then the call will die out
* immediately.
*/

SHA1_Init(&ctx);
while (offset < pack_sig) {
unsigned int remaining;
unsigned char *in = use_pack(p, w_curs, offset, &remaining);
offset += remaining;
if (offset > pack_sig)
remaining -= offset - pack_sig;
SHA1_Update(&ctx, in, remaining);
}
SHA1_Final(sha1, &ctx);
if (hashcmp(sha1, use_pack(p, w_curs, pack_sig, NULL)))
return error("Packfile %s SHA1 mismatch with itself",
p->pack_name);
if (hashcmp(sha1, (unsigned char *)index_base + index_size - 40))
return error("Packfile %s SHA1 mismatch with idx",
p->pack_name);
unuse_pack(w_curs);

/* Make sure everything reachable from idx is valid. Since we
* have verified that nr_objects matches between idx and pack,
* we do not do scan-streaming check on the pack file.
*/
nr_objects = num_packed_objects(p);
for (i = err = 0; i < nr_objects; i++) {
unsigned char sha1[20];
void *data;
char type[20];
unsigned long size, offset;

if (nth_packed_object_sha1(p, i, sha1))
die("internal error pack-check nth-packed-object");
offset = find_pack_entry_one(sha1, p);
if (!offset)
die("internal error pack-check find-pack-entry-one");
data = unpack_entry(p, offset, type, &size);
if (!data) {
err = error("cannot unpack %s from %s",
sha1_to_hex(sha1), p->pack_name);
continue;
}
if (check_sha1_signature(sha1, data, size, type)) {
err = error("packed %s from %s is corrupt",
sha1_to_hex(sha1), p->pack_name);
free(data);
continue;
}
free(data);
}

return err;
}


#define MAX_CHAIN 40

static void show_pack_info(struct packed_git *p)
{
int nr_objects, i;
unsigned int chain_histogram[MAX_CHAIN];

nr_objects = num_packed_objects(p);
memset(chain_histogram, 0, sizeof(chain_histogram));

for (i = 0; i < nr_objects; i++) {
unsigned char sha1[20], base_sha1[20];
char type[20];
unsigned long size;
unsigned long store_size;
unsigned long offset;
unsigned int delta_chain_length;

if (nth_packed_object_sha1(p, i, sha1))
die("internal error pack-check nth-packed-object");
offset = find_pack_entry_one(sha1, p);
if (!offset)
die("internal error pack-check find-pack-entry-one");

packed_object_info_detail(p, offset, type, &size, &store_size,
&delta_chain_length,
base_sha1);
printf("%s ", sha1_to_hex(sha1));
if (!delta_chain_length)
printf("%-6s %lu %lu\n", type, size, offset);
else {
printf("%-6s %lu %lu %u %s\n", type, size, offset,
delta_chain_length, sha1_to_hex(base_sha1));
if (delta_chain_length < MAX_CHAIN)
chain_histogram[delta_chain_length]++;
else
chain_histogram[0]++;
}
}

for (i = 0; i < MAX_CHAIN; i++) {
if (!chain_histogram[i])
continue;
printf("chain length %s %d: %d object%s\n",
i ? "=" : ">=",
i ? i : MAX_CHAIN,
chain_histogram[i],
1 < chain_histogram[i] ? "s" : "");
}
}

int verify_pack(struct packed_git *p, int verbose)
{
unsigned long index_size = p->index_size;
void *index_base = p->index_base;
SHA_CTX ctx;
unsigned char sha1[20];
int ret;

ret = 0;
/* Verify SHA1 sum of the index file */
SHA1_Init(&ctx);
SHA1_Update(&ctx, index_base, index_size - 20);
SHA1_Final(sha1, &ctx);
if (hashcmp(sha1, (unsigned char *)index_base + index_size - 20))
ret = error("Packfile index for %s SHA1 mismatch",
p->pack_name);

if (!ret) {
/* Verify pack file */
struct pack_window *w_curs = NULL;
ret = verify_packfile(p, &w_curs);
unuse_pack(&w_curs);
}

if (verbose) {
if (ret)
printf("%s: bad\n", p->pack_name);
else {
show_pack_info(p);
printf("%s: ok\n", p->pack_name);
}
}

return ret;
}
Something went wrong with that request. Please try again.