update relPath again

internal/bindown/install.go

@@ -115,10 +115,6 @@ func createWrapper(name, target, bindownExec, cacheDir, configFile string, missi
 	if err != nil {
 		return "", err
 	}
-	wrapperDir, err = filepath.Abs(wrapperDir)
-	if err != nil {
-		return "", err
-	}
 	if bindownExec == "" {
 		bindownExec = "bindown"
 	} else {
@@ -149,10 +145,6 @@ func createWrapper(name, target, bindownExec, cacheDir, configFile string, missi
 	if err != nil {
 		return "", err
 	}
-	cacheDir, err = filepath.Abs(cacheDir)
-	if err != nil {
-		return "", err
-	}
 	cacheDir, err = relPath(wrapperDir, cacheDir)
 	if err != nil {
 		return "", err
@@ -218,23 +210,31 @@ func relPath(base, target string) (string, error) {
 	if err == nil {
 		return filepath.ToSlash(rel), nil
 	}
-	absBase, err := filepath.Abs(base)
+
+	// convert to abs and try again
+	base, err = filepath.Abs(base)
 	if err != nil {
 		return "", err
 	}
-	absBase, err = filepath.EvalSymlinks(absBase)
+	target, err = filepath.Abs(target)
 	if err != nil {
 		return "", err
 	}
-	absTarget, err := filepath.Abs(target)
+	rel, err = filepath.Rel(base, target)
+	if err == nil {
+		return filepath.ToSlash(rel), nil
+	}
+
+	// resolve symlinks and try again
+	base, err = filepath.EvalSymlinks(base)
 	if err != nil {
 		return "", err
 	}
-	absTarget, err = filepath.EvalSymlinks(absTarget)
+	target, err = filepath.EvalSymlinks(target)
 	if err != nil {
 		return "", err
 	}
-	rel, err = filepath.Rel(absBase, absTarget)
+	rel, err = filepath.Rel(base, target)
 	if err != nil {
 		return "", err
 	}