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https://github.com/git/git.git
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ad8c80a58f
This implements show_pack_info() function used in verify-pack
command when -v flag is used to obtain something like
unpack-objects used to give when it was first written.
It shows the following for each non-deltified object found in
the pack:
SHA1 type size offset
For deltified objects, it shows this instead:
SHA1 type size offset depth base_sha1
In order to get the output in the order that appear in the pack
file for debugging purposes, you can do this:
$ git-verify-pack -v packfile | sort -n -k 4,4
Signed-off-by: Junio C Hamano <junkio@cox.net>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
143 lines
3.7 KiB
C
143 lines
3.7 KiB
C
#include "cache.h"
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#include "pack.h"
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static int verify_packfile(struct packed_git *p)
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{
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unsigned long index_size = p->index_size;
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void *index_base = p->index_base;
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SHA_CTX ctx;
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unsigned char sha1[20];
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unsigned long pack_size = p->pack_size;
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void *pack_base;
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struct pack_header *hdr;
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int nr_objects, err, i;
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/* Header consistency check */
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hdr = p->pack_base;
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if (hdr->hdr_signature != htonl(PACK_SIGNATURE))
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return error("Packfile signature mismatch", p->pack_name);
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if (hdr->hdr_version != htonl(PACK_VERSION))
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return error("Packfile version %d different from ours %d",
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ntohl(hdr->hdr_version), PACK_VERSION);
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nr_objects = ntohl(hdr->hdr_entries);
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if (num_packed_objects(p) != nr_objects)
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return error("Packfile claims to have %d objects, "
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"while idx size expects %d", nr_objects,
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num_packed_objects(p));
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SHA1_Init(&ctx);
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pack_base = p->pack_base;
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SHA1_Update(&ctx, pack_base, pack_size - 20);
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SHA1_Final(sha1, &ctx);
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if (memcmp(sha1, index_base + index_size - 40, 20))
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return error("Packfile %s SHA1 mismatch with idx",
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p->pack_name);
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if (memcmp(sha1, pack_base + pack_size - 20, 20))
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return error("Packfile %s SHA1 mismatch with itself",
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p->pack_name);
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/* Make sure everything reachable from idx is valid. Since we
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* have verified that nr_objects matches between idx and pack,
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* we do not do scan-streaming check on the pack file.
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*/
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for (i = err = 0; i < nr_objects; i++) {
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unsigned char sha1[20];
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struct pack_entry e;
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void *data;
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char type[20];
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unsigned long size;
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if (nth_packed_object_sha1(p, i, sha1))
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die("internal error pack-check nth-packed-object");
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if (!find_pack_entry_one(sha1, &e, p))
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die("internal error pack-check find-pack-entry-one");
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data = unpack_entry_gently(&e, type, &size);
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if (!data) {
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err = error("cannot unpack %s from %s",
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sha1_to_hex(sha1), p->pack_name);
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continue;
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}
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if (check_sha1_signature(sha1, data, size, type)) {
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err = error("cannot packed %s from %s corrupt",
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sha1_to_hex(sha1), p->pack_name);
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free(data);
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continue;
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}
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free(data);
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}
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return err;
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}
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static void show_pack_info(struct packed_git *p)
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{
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struct pack_header *hdr;
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int nr_objects, i;
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hdr = p->pack_base;
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nr_objects = ntohl(hdr->hdr_entries);
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for (i = 0; i < nr_objects; i++) {
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unsigned char sha1[20], base_sha1[20];
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struct pack_entry e;
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char type[20];
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unsigned long size;
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unsigned long store_size;
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int delta_chain_length;
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if (nth_packed_object_sha1(p, i, sha1))
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die("internal error pack-check nth-packed-object");
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if (!find_pack_entry_one(sha1, &e, p))
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die("internal error pack-check find-pack-entry-one");
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packed_object_info_detail(&e, type, &size, &store_size,
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&delta_chain_length,
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base_sha1);
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printf("%s ", sha1_to_hex(sha1));
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if (!delta_chain_length)
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printf("%-6s %lu %u\n", type, size, e.offset);
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else
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printf("%-6s %lu %u %d %s\n", type, size, e.offset,
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delta_chain_length, sha1_to_hex(base_sha1));
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}
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}
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int verify_pack(struct packed_git *p, int verbose)
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{
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unsigned long index_size = p->index_size;
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void *index_base = p->index_base;
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SHA_CTX ctx;
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unsigned char sha1[20];
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int ret;
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ret = 0;
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/* Verify SHA1 sum of the index file */
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SHA1_Init(&ctx);
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SHA1_Update(&ctx, index_base, index_size - 20);
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SHA1_Final(sha1, &ctx);
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if (memcmp(sha1, index_base + index_size - 20, 20))
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ret = error("Packfile index for %s SHA1 mismatch",
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p->pack_name);
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if (!ret) {
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/* Verify pack file */
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use_packed_git(p);
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ret = verify_packfile(p);
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unuse_packed_git(p);
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}
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if (verbose) {
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if (ret)
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printf("%s: bad\n", p->pack_name);
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else {
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use_packed_git(p);
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show_pack_info(p);
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unuse_packed_git(p);
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printf("%s: ok\n", p->pack_name);
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}
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}
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return ret;
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}
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