Search for Python version also in /usr/lib/python

Path to Python is different on deb-based distributions and rpm-based
distributions (e.g. Fedora, CentOS).

Author: fridex

differs/pip_diff.go

@@ -129,7 +129,13 @@ func getPythonVersion(pathToLayer string) ([]string, error) {
 		return matches, err
 	}
 
-	for _, file := range libContents {
+	libPath = filepath.Join(pathToLayer, "usr/lib")
+	libContents2, err := ioutil.ReadDir(libPath)
+	if err != nil {
+		return matches, err
+	}
+
+	for _, file := range append(libContents, libContents2...) {
 		pattern := regexp.MustCompile("^python[0-9]+\\.[0-9]+$")
 		match := pattern.FindString(file.Name())
 		if match != "" {