Re: [RFC/PATCH 0/6] hash-object: use fsck to check objects

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On Wed, Jan 18, 2023 at 12:59:24PM -0800, Junio C Hamano wrote:
> The --literally option was invented initially primarily to allow a
> bogus type of object (e.g. "hash-object -t xyzzy --literally") but I
> am happy to see that we are finding different uses.  I wonder if
> these objects of known types but with syntactically bad contents can
> be "repack"ed from loose into packed?
>
> >   [5/6]: fsck: provide a function to fsck buffer without object struct

It is indeed possible:

--- >8 ---
Initialized empty Git repository in /home/ttaylorr/src/git/t/trash directory.t9999-test/.git/
expecting success of 9999.1 'repacking corrupt loose object into packed':
	name=$(echo $ZERO_OID | sed -e "s/00/Q/g") &&
	printf "100644 fooQ$name" | q_to_nul |
		git hash-object -w --stdin -t tree >in &&

	git pack-objects .git/objects/pack/pack <in

Enumerating objects: 1, done.
Counting objects: 100% (1/1), done.
06146c77fd19c096858d6459d602be0fdf10891b
Writing objects: 100% (1/1), done.
Total 1 (delta 0), reused 0 (delta 0), pack-reused 0
ok 1 - repacking corrupt loose object into packed
--- 8< ---

Thanks,
Taylor



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