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Anonymous committed e93ec6f

Revert "check_packed_git_idx(): check integrity of the idx file itself."

This reverts c5ced64578a82b9d172aceb2f67c6fb9e639f6d9 commit.
It turns out that doing this check every time we map the idx file
is quite expensive. A corrupt idx file is caught by git-fsck-objects,
so this check is not strictly necessary.

In one unscientific test, 0.99.9m spent 10 seconds usertime for
the same task 1.1.3 takes 37 seconds usertime. Reverting this gives
us the performance of 0.99.9 back.

Comments (0)

Files changed (1)

 static int check_packed_git_idx(const char *path, unsigned long *idx_size_,
 				void **idx_map_)
 {
-	SHA_CTX ctx;
-	unsigned char sha1[20];
 	void *idx_map;
 	unsigned int *index;
 	unsigned long idx_size;
 	int nr, i;
-	int fd;
+	int fd = open(path, O_RDONLY);
 	struct stat st;
-
-	fd = open(path, O_RDONLY);
 	if (fd < 0)
 		return -1;
 	if (fstat(fd, &st)) {
 	if (idx_size != 4*256 + nr * 24 + 20 + 20)
 		return error("wrong index file size");
 
-	/*
-	 * File checksum.
-	 */
-	SHA1_Init(&ctx);
-	SHA1_Update(&ctx, idx_map, idx_size-20);
-	SHA1_Final(sha1, &ctx);
-
-	if (memcmp(sha1, idx_map + idx_size - 20, 20))
-		return error("index checksum mismatch");
-
 	return 0;
 }