Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
Fetching contributors…

Cannot retrieve contributors at this time

144 lines (125 sloc) 3.796 kb
#include "cache.h"
#include "pack.h"
static int verify_packfile(struct packed_git *p)
{
unsigned long index_size = p->index_size;
void *index_base = p->index_base;
SHA_CTX ctx;
unsigned char sha1[20];
unsigned long pack_size = p->pack_size;
void *pack_base;
struct pack_header *hdr;
int nr_objects, err, i;
/* Header consistency check */
hdr = p->pack_base;
if (hdr->hdr_signature != htonl(PACK_SIGNATURE))
return error("Packfile %s signature mismatch", p->pack_name);
if (hdr->hdr_version != htonl(PACK_VERSION))
return error("Packfile version %d different from ours %d",
ntohl(hdr->hdr_version), PACK_VERSION);
nr_objects = ntohl(hdr->hdr_entries);
if (num_packed_objects(p) != nr_objects)
return error("Packfile claims to have %d objects, "
"while idx size expects %d", nr_objects,
num_packed_objects(p));
SHA1_Init(&ctx);
pack_base = p->pack_base;
SHA1_Update(&ctx, pack_base, pack_size - 20);
SHA1_Final(sha1, &ctx);
if (memcmp(sha1, index_base + index_size - 40, 20))
return error("Packfile %s SHA1 mismatch with idx",
p->pack_name);
if (memcmp(sha1, pack_base + pack_size - 20, 20))
return error("Packfile %s SHA1 mismatch with itself",
p->pack_name);
/* 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.
*/
for (i = err = 0; i < nr_objects; i++) {
unsigned char sha1[20];
struct pack_entry e;
void *data;
char type[20];
unsigned long size;
if (nth_packed_object_sha1(p, i, sha1))
die("internal error pack-check nth-packed-object");
if (!find_pack_entry_one(sha1, &e, p))
die("internal error pack-check find-pack-entry-one");
data = unpack_entry_gently(&e, 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;
}
static void show_pack_info(struct packed_git *p)
{
struct pack_header *hdr;
int nr_objects, i;
hdr = p->pack_base;
nr_objects = ntohl(hdr->hdr_entries);
for (i = 0; i < nr_objects; i++) {
unsigned char sha1[20], base_sha1[20];
struct pack_entry e;
char type[20];
unsigned long size;
unsigned long store_size;
int delta_chain_length;
if (nth_packed_object_sha1(p, i, sha1))
die("internal error pack-check nth-packed-object");
if (!find_pack_entry_one(sha1, &e, p))
die("internal error pack-check find-pack-entry-one");
packed_object_info_detail(&e, type, &size, &store_size,
&delta_chain_length,
base_sha1);
printf("%s ", sha1_to_hex(sha1));
if (!delta_chain_length)
printf("%-6s %lu %u\n", type, size, e.offset);
else
printf("%-6s %lu %u %d %s\n", type, size, e.offset,
delta_chain_length, sha1_to_hex(base_sha1));
}
}
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 (memcmp(sha1, index_base + index_size - 20, 20))
ret = error("Packfile index for %s SHA1 mismatch",
p->pack_name);
if (!ret) {
/* Verify pack file */
use_packed_git(p);
ret = verify_packfile(p);
unuse_packed_git(p);
}
if (verbose) {
if (ret)
printf("%s: bad\n", p->pack_name);
else {
use_packed_git(p);
show_pack_info(p);
unuse_packed_git(p);
printf("%s: ok\n", p->pack_name);
}
}
return ret;
}
Jump to Line
Something went wrong with that request. Please try again.