Re: git gc gives "error: Could not read..."

> On Mon, Jun 01, 2015 at 10:40:53AM +0200, Stefan Näwe wrote:
> 
>> Turns out to be a tree:
>>
>> tree 7713c3b1e9ea2dd9126244697389e4000bb39d85
>> parent d7acfc22fbc0fba467d82f41c90aab7d61f8d751
>> author Stefan Naewe <stefan.naewe@atlas-elektronik.com> 1429536806 +0200
>> committer Stefan Naewe <stefan.naewe@atlas-elektronik.com> 1429536806 +0200
> 
> Yeah, I bungled the grep earlier. That message can come from a missing
> tag, tree, or commit object. But I think the root cause is the same.

>> Not exactly. My msysgit is merge-rebase'd (or rebase-merge'd...) onto v2.2.0...
>> I'll try older versions (pre v2.2.0) on linux.
> 
> OK, that makes more sense then.
> 
>> I also cloned from local filesystem (widnows drive) to a samba share.
> 
> And that, too.
> 
> I've managed to create a small test case that replicates the problem:
> 
> diff --git a/t/t6501-freshen-objects.sh b/t/t6501-freshen-objects.sh
> index 157f3f9..015b0da 100755
> --- a/t/t6501-freshen-objects.sh
> +++ b/t/t6501-freshen-objects.sh
> @@ -129,4 +129,19 @@ for repack in '' true; do
>  	'
>  done
>  
> +test_expect_failure 'do not complain about existing broken links' '
> +	cat >broken-commit <<-\EOF &&
> +	tree 0000000000000000000000000000000000000001
> +	parent 0000000000000000000000000000000000000002
> +	author whatever <whatever@example.com> 1234 -0000
> +	committer whatever <whatever@example.com> 1234 -0000
> +
> +	some message
> +	EOF
> +	commit=$(git hash-object -t commit -w broken-commit) &&
> +	git gc 2>stderr &&
> +	verbose git cat-file -e $commit &&
> +	test_must_be_empty stderr
> +'
> +
>  test_done
> 
> which produces:
> 
>   'stderr' is not empty, it contains:
>   error: Could not read 0000000000000000000000000000000000000002
>   error: Could not read 0000000000000000000000000000000000000001
>   error: Could not read 0000000000000000000000000000000000000002
>   error: Could not read 0000000000000000000000000000000000000001
> 
> Unfortunately the fix is a little bit invasive. I'll send something out
> in a few minutes.