update relPath

internal/bindown/install.go

@@ -205,6 +205,11 @@ func createBindownWrapper(target, cacheDir, tag, baseURL string) (string, error)
 // relPath returns target relative to base and converted to slash-separated path.
 // Unlike filepath.Rel, it converts both paths to absolute paths before calculating the relative path.
 func relPath(base, target string) (string, error) {
+	// if it works without abs, use that
+	rel, err := filepath.Rel(base, target)
+	if err == nil {
+		return filepath.ToSlash(rel), nil
+	}
 	absBase, err := filepath.Abs(base)
 	if err != nil {
 		return "", err
@@ -221,7 +226,7 @@ func relPath(base, target string) (string, error) {
 	if err != nil {
 		return "", err
 	}
-	rel, err := filepath.Rel(absBase, absTarget)
+	rel, err = filepath.Rel(absBase, absTarget)
 	if err != nil {
 		return "", err
 	}