os.py: rename get_os_release_codename() to get_os_release_info()

and have it return a dictionary of os-release file's contents.

Some users need to query versions also.

Author: mtwebster

xapp/os.py

@@ -127,15 +127,22 @@ def run_with_admin_privs(command, message=None, icon=None, support_pkexec=False)
     else:
         return False
 
-def get_os_release_codename():
+def get_os_release_info():
     try:
-        os_release = {}
-        with open("/etc/os-release") as f:
+        with open("/etc/os-release", encoding="utf-8") as f:
             reader = csv.reader(f, delimiter="=")
-            os_release = dict(reader)
-
-        return os_release["VERSION_CODENAME"]
+            return dict(reader)
     except Exception as e:
-        print("Unable to retrieve codename from /etc/os-release: %s" % str(e))
-
-    return None
+        print("Unable to retrieve /etc/os-release: %s" % str(e))
+
+    return {
+        "NAME"            : "unknown",
+        "VERSION"         : "unknown",
+        "ID"              : "unknown",
+        "ID_LIKE"         : "unknown",
+        "PRETTY_NAME"     : "unknown",
+        "VERSION_ID"      : "unknown",
+        "VERSION_CODENAME": "unknown",
+        "UBUNTU_CODENAME" : "unknown",
+        "DEBIAN_CODENAME" : "unknown"
+    }