Re: Bug? Files are losing history after subtree merge

[Matthieu Moy <Matthieu.Moy@grenoble-inp.fr>]

Ralf Thielow <ralf.thielow@gmail.com> writes:

> Hi,
>
> recently I did a merge where a complete repo shall be
> merged into a specific directory of another repo. I
> tried both the "subtree" merge strategy and the option
> "-Xsubtree=<dir>" of "recursive". I noticed that in both
> cases somehow the history of single files were lost
> during these merges (with history I mean 'git log <file>'
> and 'git log --follow <file>').

This is a known bug of "git log --follow": it does not follow accross
subtree merge. But your history is still there (try gitk on your project
for example).

Technically, a subtree merge is a merge commit in which files are
renamed compared to the second parent. --follow does not manage this
case.

> diff --git a/t/t6029-merge-subtree.sh b/t/t6029-merge-subtree.sh
> index 73fc240..e9a97d7 100755
> --- a/t/t6029-merge-subtree.sh
> +++ b/t/t6029-merge-subtree.sh
> @@ -61,6 +61,14 @@ test_expect_success 'initial merge' '
>  	test_cmp expected actual
>  '
>  
> +test_expect_failure 'file keeps history after subtree merge' '
> +	cd ../git-gui &&
> +	git log --follow git-gui.sh >../git/expected &&
> +	cd ../git &&
> +	git log --follow git-gui/git-gui.sh >actual &&
> +	test_cmp expected actual
> +'
> +

That would actually be good to add a failing test to "document" the
failure.

-- 
Matthieu Moy
http://www-verimag.imag.fr/~moy/