Re: [PATCH 1/3] common/attr: make _require_attrs more fine-grained

[Eryu Guan <guan@eryu.me>]

On Thu, Sep 10, 2020 at 07:43:53PM +0000, Frank van der Linden wrote:
> Filesystems may not support all xattr types. But, _require_attr assumes
> that being able to use "user" namespace xattrs means that all namespaces
> ("trusted", "system", etc) are supported. This breaks on NFS, that only
> supports the "user" namespace, and a few cases in the "system" namespace.
> 
> Change _require_attrs to optionally take namespace arguments that specify
> the namespaces to check for. The default behavior (no arguments) is still
> to check for the "user" namespace only.
> 
> Signed-off-by: Frank van der Linden <fllinden@amazon.com>

This patchset looks great to me, thanks!

Some minor nits below (and I've fixed them on commit, so there's no need
to resend :)

> ---
>  common/attr | 49 +++++++++++++++++++++++++++++++------------------
>  1 file changed, 31 insertions(+), 18 deletions(-)
> 
> diff --git a/common/attr b/common/attr
> index 20049de0..c60cb6ed 100644
> --- a/common/attr
> +++ b/common/attr
> @@ -175,30 +175,43 @@ _list_acl()
>  
>  _require_attrs()
>  {
> +    local args
> +    local nsp
> +
> +    if [ $# -eq 0 ];
> +    then

We prefer the following coding style in fstests

	if [ $# -eq 0 ]; then
		args="user"
	else
		args="$*"
	fi

> +      args="user"
> +    else
> +      args="$*"
> +    fi

And you've almost re-written the whole _require_attrs(), it's better to
use tab as indention instead of 4 spaces (we're in the (very slow)
progress converting all 4-spaces indention to tab, except there're old
code using 4-spaces around).

> +
>      [ -n "$ATTR_PROG" ] || _notrun "attr command not found"
>      [ -n "$GETFATTR_PROG" ] || _notrun "getfattr command not found"
>      [ -n "$SETFATTR_PROG" ] || _notrun "setfattr command not found"
>  
> -    #
> -    # Test if chacl is able to write an attribute on the target filesystems.
> -    # On really old kernels the system calls might not be implemented at all,
> -    # but the more common case is that the tested filesystem simply doesn't
> -    # support attributes.  Note that we can't simply list attributes as
> -    # various security modules generate synthetic attributes not actually
> -    # stored on disk.
> -    #
> -    touch $TEST_DIR/syscalltest
> -    attr -s "user.xfstests" -V "attr" $TEST_DIR/syscalltest > $TEST_DIR/syscalltest.out 2>&1
> -    cat $TEST_DIR/syscalltest.out >> $seqres.full
> +    for nsp in $args
> +    do

Same here, use the format below

	for nsp in $args; do
		<do things here>
	done

Thanks,
Eryu

> +      #
> +      # Test if chacl is able to write an attribute on the target filesystems.
> +      # On really old kernels the system calls might not be implemented at all,
> +      # but the more common case is that the tested filesystem simply doesn't
> +      # support attributes.  Note that we can't simply list attributes as
> +      # various security modules generate synthetic attributes not actually
> +      # stored on disk.
> +      #
> +      touch $TEST_DIR/syscalltest
> +      $SETFATTR_PROG -n "$nsp.xfstests" -v "attr" $TEST_DIR/syscalltest > $TEST_DIR/syscalltest.out 2>&1
> +      cat $TEST_DIR/syscalltest.out >> $seqres.full
>  
> -    if grep -q 'Function not implemented' $TEST_DIR/syscalltest.out; then
> -      _notrun "kernel does not support attrs"
> -    fi
> -    if grep -q 'Operation not supported' $TEST_DIR/syscalltest.out; then
> -      _notrun "attrs not supported by this filesystem type: $FSTYP"
> -    fi
> +      if grep -q 'Function not implemented' $TEST_DIR/syscalltest.out; then
> +        _notrun "kernel does not support attrs"
> +      fi
> +      if grep -q 'Operation not supported' $TEST_DIR/syscalltest.out; then
> +        _notrun "attr namespace $nsp not supported by this filesystem type: $FSTYP"
> +      fi
>  
> -    rm -f $TEST_DIR/syscalltest.out
> +      rm -f $TEST_DIR/syscalltest.out
> +    done
>  }
>  
>  _require_attr_v1()
> -- 
> 2.16.6