Use Python password database module in place of /etc/passwd. This seems to...

Use Python password database module in place of /etc/passwd. This seems to work fine also with the SSSD daemon on tn-bastion.ia2.

Signed-off-by: Cristiano Urban <cristiano.urban@inaf.it>

transfer_service/system_utils.py

@@ -6,6 +6,7 @@
 #
 
 import os
+import pwd
 import re
 import shutil
 import sys
@@ -27,24 +28,15 @@ class SystemUtils(object):
 
     def userInfo(self, username):
         """
-        Parses '/etc/passwd' and returns user, uid and gid associated to
-        a given username.
+        Returns username, UID and GID associated to a given user,
+        using the Python password database module (pwd).
         """
         try:
-            fp = open("/etc/passwd", 'r')
-        except FileNotFoundError:
-            raise
-        else:
-            for line in fp:
-                info = line.split(':')
-                user = info[0]
-                uid = int(info[2])
-                gid = int(info[3])
-                if user == username:
-                    fp.close()
-                    return [ user, uid, gid ]
-            fp.close()
+            info = pwd.getpwnam(username)
+        except KeyError:
             return False
+        else:
+            return [ info[0], info[2], info[3] ]
 
     def findIllegalCharacters(self, name):
         """Checks for file/dir names containing illegal characters."""