use distutils to locate rpm executable

gwkoji/rpm.py

@@ -20,9 +20,11 @@
 """
 
 import subprocess
+from distutils.spawn import find_executable
 
 
 # method to get the package name from the source
 def get_package_name_from_source_rpm(source):
-    cmd = ['rpm', '--queryformat', '%{NAME}', '-qp', source]
+    rpm = find_executable('rpm')
+    cmd = [rpm, '--queryformat', '%{NAME}', '-qp', source]
     return subprocess.check_output(cmd).decode()