xattr_linux.go

package xattr

/*
import (
    "strings"
)

const (
    userPrefix = "user."
)

// Linux xattrs have a manditory prefix of "user.". This is prepended 
// transparently for Get/Set/Remove and hidden in List
*/


func IsXattrExists(path, name string) bool {
    _, err := getxattr(path, name, nil, 0)
    return err == nil
}

// Retrieve extended attribute data associated with path.
func Getxattr(path, name string) ([]byte, error) {
    //name = userPrefix + name
    // find size.
    size, err := getxattr(path, name, nil, 0)
    if err != nil {
        return nil, &XAttrError{"getxattr", path, name, err}
    }
    buf := make([]byte, size)
    // Read into buffer of that size.
    read, err := getxattr(path, name, &buf[0], size)
    if err != nil {
        return nil, &XAttrError{"getxattr", path, name, err}
    }
    return buf[:read], nil
}

// Retrieves a list of names of extended attributes associated with the 
// given path in the file system.
func Listxattr(path string) ([]string, error) {
    // find size.
    size, err := listxattr(path, nil, 0)
    if err != nil {
        return nil, &XAttrError{"listxattr", path, "", err}
    }
    buf := make([]byte, size)
    // Read into buffer of that size.
    read, err := listxattr(path, &buf[0], size)
    if err != nil {
        return nil, &XAttrError{"listxattr", path, "", err}
    }
    return nullTermToStrings(buf[:read]), nil
    //return stripUserPrefix(nullTermToStrings(buf[:read])), nil
}

// Associates name and data together as an attribute of path. 
func Setxattr(path, name string, data []byte) error {
    //name = userPrefix + name
    if err := setxattr(path, name, &data[0], len(data)); err != nil {
        return &XAttrError{"setxattr", path, name, err}
    }
    return nil
}

// Remove the attribute.
func Removexattr(path, name string) error {
    //name = userPrefix + name
    if err := removexattr(path, name); err != nil {
        return &XAttrError{"removexattr", path, name, err}
    }
    return nil
}

// Strip off "user." prefixes from attribute names.
func stripUserPrefix(s []string) []string {
    for i, a := range s {
        if strings.HasPrefix(a, userPrefix) {
            s[i] = a[5:]
        }
    }
    return s
}