Remove Relative method from Locator

The Relative method added to the Locator interface was
not correctly implemented in the file type. The root was
never set when instantiating the object.

This change removes this method from the interface and the file
type, switching to a local implementation in the mounts type
instead.

Signed-off-by: Evan Lezar <elezar@nvidia.com>

internal/lookup/file.go

@@ -28,7 +28,6 @@ import (
 // prefixes. The validity of a file is determined by a filter function.
 type file struct {
 	logger   *log.Logger
-	root     string
 	prefixes []string
 	filter   func(string) error
 }
@@ -78,15 +77,6 @@ func (p file) Locate(pattern string) ([]string, error) {
 	return filenames, nil
 }
 
-// Relative returns the path relative to the root for the file locator
-func (p file) Relative(path string) (string, error) {
-	if p.root == "" || p.root == "/" {
-		return path, nil
-	}
-
-	return filepath.Rel(p.root, path)
-}
-
 // assertFile checks whether the specified path is a regular file
 func assertFile(filename string) error {
 	info, err := os.Stat(filename)

internal/lookup/locator.go

@@ -21,5 +21,4 @@ package lookup
 // Locator defines the interface for locating files on a system.
 type Locator interface {
 	Locate(string) ([]string, error)
-	Relative(string) (string, error)
 }