When localDir is relative cleanup doesn't work correctly

localDir defaults to a relative directory, and when it is then
recorder's system breaks down as part of it is relative and part
absolute, so it ends up deleting things it should be keeping in the
background gc cleanup.

This change makes everything work off the absolute paths.

pkg/recorder/recorder.go

@@ -26,7 +26,7 @@ type logger interface {
 	Errorf(format string, args ...interface{})
 }
 
-// activeFiles will contain a list of active (present in cluster) objets; we'll
+// activeFiles will contain a list of active (present in cluster) objects; we'll
 // use that to periodically find and garbage collect stale objets in the git repos
 // (ie. if some objects were delete from cluster while katafygio was not running),
 // and to skip already existing and unchanged files.
@@ -132,8 +132,12 @@ func (w *Listener) remove(file string) error {
 }
 
 func (w *Listener) relativePath(file string) string {
-	root := filepath.Clean(w.localDir)
-	return strings.Replace(file, root+"/", "", 1)
+	root, err := filepath.Abs(w.localDir)
+	if err != nil {
+		// Fallback to something
+		root = filepath.Clean(w.localDir)
+	}
+	return strings.Replace(file, filepath.Clean(root+"/"), "", 1)
 }
 
 func (w *Listener) save(file string, data []byte) error {
@@ -185,9 +189,12 @@ func (w *Listener) save(file string, data []byte) error {
 func (w *Listener) deleteObsoleteFiles() {
 	w.activesLock.RLock()
 	defer w.activesLock.RUnlock()
-	root := filepath.Clean(w.localDir)
+	root, err := filepath.Abs(w.localDir)
+	if err != nil {
+		w.logger.Errorf("failed to absolute path to %s", w.localDir)
+	}
 
-	err := afero.Walk(appFs, root, func(path string, info os.FileInfo, err error) error {
+	err = afero.Walk(appFs, root, func(path string, info os.FileInfo, err error) error {
 		if info == nil {
 			return fmt.Errorf("can't stat %s", path)
 		}