apfstests/common/attr

##/bin/bash
#-----------------------------------------------------------------------
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#-----------------------------------------------------------------------
# common extended attribute and ACL support

# pick three unused user/group ids, store them as $acl[1-3]
#
_acl_setup_ids()
{
    eval `(_cat_passwd; _cat_group) | awk -F: '
      { ids[$3]=1 }
      END {
        j=1
        for(i=1; i<1000000 && j<=3;i++){
          if (! (i in ids)) {
	     printf "acl%d=%d;", j, i;		 
	     j++
          }
        }	
      }'`
}

# filter for the acl ids selected above
#
_acl_filter_id()
{
    sed \
       -e "s/u:$acl1/u:id1/" \
       -e "s/u:$acl2/u:id2/" \
       -e "s/u:$acl3/u:id3/" \
       -e "s/g:$acl1/g:id1/" \
       -e "s/g:$acl2/g:id2/" \
       -e "s/g:$acl3/g:id3/" \
       -e "s/ $acl1 / id1 /" \
       -e "s/ $acl2 / id2 /" \
       -e "s/ $acl3 / id3 /"
}

# filtered ls
#
_acl_ls()
{
    _ls_l -n $* | awk '{ print $1, $3, $4, $NF }' | _acl_filter_id
} 

#
_acl_list()
{
    _file1=$1

    if [ $HOSTOS = "IRIX" ]; then
	ls -dD $_file1 | _acl_filter_id
    else 
        chacl -l $_file1 | _acl_filter_id
    fi
}

# create an ACL with n ACEs in it
#
_create_n_aces()
{
    let n=$1-4
    acl='u::rwx,g::rwx,o::rwx,m::rwx' # 4 ace acl start
    while [ $n -ne 0 ]; do
	acl="$acl,u:$n:rwx"
	let n=$n-1
    done
    echo $acl
}

# filter user ace names to user ids
#
_filter_aces()
{
    tmp_file=`mktemp /tmp/ace.XXXXXX`

    (_cat_passwd; _cat_group) > $tmp_file

    $AWK_PROG -v tmpfile=$tmp_file '
	BEGIN {
	    FS=":"
	    while ( getline <tmpfile > 0 ) {
		idlist[$1] = $3 
	    }
	}
	/^user/ { if ($2 in idlist) sub($2, idlist[$2]); print; next}
	/^u/ { if ($2 in idlist) sub($2, idlist[$2]); print; next}
	/^default:user/ { if ($3 in idlist) sub($3, idlist[$3]); print; next}
	{print}
    '
    rm -f $tmp_file
}

_filter_aces_notypes()
{
    tr '\[' '\012' | tr ']' '\012' | tr ',' '\012' | _filter_aces|\
    sed -e 's/u:/user:/' -e 's/g:/group:/' -e 's/o:/other:/' -e 's/m:/mask:/'
}

_require_acls()
{
    if [ ! -x /bin/chacl -a ! -x /usr/bin/chacl -a ! -x /sbin/chacl ]; then
    	_notrun "chacl command not found"
    fi

    #
    # Test if chacl is able to list ACLs 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
    # ACLs.
    #
    touch $TEST_DIR/syscalltest
    chacl -l $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 ACLs"
    fi
    if grep -q 'Operation not supported' $TEST_DIR/syscalltest.out; then
      _notrun "ACLs not supported by this filesystem type: $FSTYP"
    fi

    rm -f $TEST_DIR/syscalltest.out
}

_list_acl()
{
    file=$1

    ls -dD $file | _acl_filter_id
}

_require_attrs()
{
    [ -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 > $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

    rm -f $TEST_DIR/syscalltest.out
}

# getfattr -R returns info in readdir order which varies from fs to fs.
# This sorts the output by filename
_sort_getfattr_output()
{
    awk '{a[FNR]=$0}END{n = asort(a); for(i=1; i <= n; i++) print a[i]"\n"}' RS=''
}

# set maximum total attr space based on fs type
if [ "$FSTYP" == "xfs" -o "$FSTYP" == "udf" ]; then
	MAX_ATTRS=1000
else # Assume max ~1 block of attrs
	BLOCK_SIZE=`stat -f $TEST_DIR | grep "Block size" | cut -d " " -f3`
	# user.attribute_XXX="value.XXX" is about 32 bytes; leave some overhead
	let MAX_ATTRS=$BLOCK_SIZE/40
fi

export MAX_ATTRS

# Set max attr value size based on fs type
if [ "$FSTYP" == "xfs" -o "$FSTYP" == "udf" -o "$FSTYP" == "btrfs" ]; then
	MAX_ATTRVAL_SIZE=64
else # Assume max ~1 block of attrs
	BLOCK_SIZE=`stat -f $TEST_DIR | grep "Block size" | cut -d " " -f3`
	# leave a little overhead
	let MAX_ATTRVAL_SIZE=$BLOCK_SIZE-256
fi

export MAX_ATTRVAL_SIZE
# make sure this script returns success
/bin/true