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https://github.com/git/git.git
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f9253394a2
Given a list of <pack>.idx files, this command validates the index file and the corresponding .pack file for consistency. This patch also uses the same validation mechanism in fsck-cache when the --full flag is used. During normal operation, sha1_file.c verifies that a given .idx file matches the .pack file by comparing the SHA1 checksum stored in .idx file and .pack file as a minimum sanity check. We may further want to check the pack signature and version when we map the pack, but that would be a separate patch. Earlier, errors to map a pack file was not flagged fatal but led to a random fatal error later. This version explicitly die()s when such an error is detected. Signed-off-by: Junio C Hamano <junkio@cox.net> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
63 lines
1.7 KiB
C
63 lines
1.7 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;
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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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return 0;
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}
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int verify_pack(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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int ret;
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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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return error("Packfile index for %s SHA1 mismatch",
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p->pack_name);
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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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return ret;
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}
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