Re: [PATCH] t4129: don't fail if setgid is set in the parent directory

> The last test of t4129 creates a directory and expects its setgid bit
> (g+s) to be off. But this makes the test fail when the parent directory
> has the bit set, as setgid's state is inherited by newly created
> subdirectories. Make the test more robust by accepting the presence of
> the setgid bit on the created directory. We only allow 'S' (setgid on
> but no executable permission) and not 's' (setgid on with executable
> permission) because the previous 'umask 0077' shouldn't allow the second
> scenario to happen.
> 
> Note that only subdirectories inherit this bit, so we don't have to make
> the same change for the regular file that is also created by this test.
> But checking the permissions using grep instead of test_cmp makes the
> test a little simpler, so let's use it for the regular file as well.
> 
> Also note that the sticky bit (+t) and the setuid bit (u+s) are not
> inherited, so we don't have to worry about those.
> 
> Reported-by: Kevin Daudt <me@ikke.info>
> Signed-off-by: Matheus Tavares <matheus.bernardino@usp.br>
> ---
>  t/t4129-apply-samemode.sh | 10 ++++------
>  1 file changed, 4 insertions(+), 6 deletions(-)
> 
> diff --git a/t/t4129-apply-samemode.sh b/t/t4129-apply-samemode.sh
> index 41818d8315..3818398ca9 100755
> --- a/t/t4129-apply-samemode.sh
> +++ b/t/t4129-apply-samemode.sh
> @@ -90,12 +90,10 @@ test_expect_success POSIXPERM 'do not use core.sharedRepository for working tree
>  		rm -rf d f1 &&
>  		git apply patch-f1-and-f2.txt &&
>  
> -		echo "-rw-------" >f1_mode.expected &&
> -		echo "drwx------" >d_mode.expected &&
> -		test_modebits f1 >f1_mode.actual &&
> -		test_modebits d >d_mode.actual &&
> -		test_cmp f1_mode.expected f1_mode.actual &&
> -		test_cmp d_mode.expected d_mode.actual
> +		test_modebits f1 >f1_mode &&
> +		test_modebits d >d_mode &&
> +		grep "^-rw-------$" f1_mode &&
> +		grep "^drwx--[-S]---$" d_mode
>  	)
>  '
>  
> -- 
> 2.29.2
>