Re: [btrfs-progs PATCHv2 1/4] tests: common: Add check_dm_target_support helper

[Marcos Paulo de Souza <mpdesouza@suse.de>]

Forget this patch, I understood it wrong. I will add setup_root_helper
before the $SUDO_HELPER from v1 in a different patch. 

On Tue, 2019-12-17 at 22:19 -0300, Marcos Paulo de Souza wrote:
> From: Marcos Paulo de Souza <mpdesouza@suse.com>
> 
> This function will be used later to test if dm-thin is supported.
> Inspired by fstests.
> 
> Suggested-by: Qu Wenruo <wqu@suse.com>
> Signed-off-by: Marcos Paulo de Souza <mpdesouza@suse.com>
> ---
>  Changes from v1:
>  Removed the $SUDO_HELPER variable when executing modprobe and
> dmsetup (Qu
>  Wenruo)
> 
>  tests/common | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
> 
> diff --git a/tests/common b/tests/common
> index ca098444..20ad7fd9 100644
> --- a/tests/common
> +++ b/tests/common
> @@ -322,6 +322,19 @@ check_global_prereq()
>  	fi
>  }
>  
> +# check if the targets passed as arguments are available, and if not
> just skip
> +# the test
> +check_dm_target_support()
> +{
> +	for target in "$@"; do
> +		modprobe dm-$target >/dev/null 2>&1
> +		dmsetup targets 2>&1 | grep -q ^$target
> +		if [ $? -ne 0 ]; then
> +			_not_run "This test requires dm $target
> support."
> +		fi
> +	done
> +}
> +
>  check_image()
>  {
>  	local image