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tag: v0.99.8g
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#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;
}
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