From 358f591bb68c637de4292055e4c6e22990f6de63 Mon Sep 17 00:00:00 2001
From: Arber Zela <zelaa@informatik.uni-freiburg.de>
Date: Mon, 26 Nov 2018 01:04:04 +0100
Subject: [PATCH] find nic_name automatically if misspecified

---
 hpbandster/utils.py | 29 ++++++++++++++++++++++++-----
 1 file changed, 24 insertions(+), 5 deletions(-)

diff --git a/hpbandster/utils.py b/hpbandster/utils.py
index e29a25d..df192ce 100644
--- a/hpbandster/utils.py
+++ b/hpbandster/utils.py
@@ -11,11 +11,30 @@
 
 
 
-def nic_name_to_host(nic_name):
-	""" translates the name of a network card into a valid host name"""
-	from netifaces import ifaddresses, AF_INET
-	host = ifaddresses(nic_name).setdefault(AF_INET, [{'addr': 'No IP addr'}] )[0]['addr']
-	return(host)
+def nic_name_to_host(nic_name=None):
+    """ translates the name of a network card into a valid host name"""
+    from netifaces import ifaddresses, AF_INET
+
+    def get_nic_name_from_system():
+        import re
+        import subprocess
+        process = subprocess.Popen("ip route get 8.8.8.8".split(),
+                                   stdout=subprocess.PIPE)
+        output = process.stdout.read().decode()
+        s = re.search(r'dev\s*(\S+)', output)
+        return s.group(1)
+
+    # if the network card name is not a valid one an ecxeption will be raised
+    # and the method get_nic_name_from_system will discover a valid card name
+    try:
+        host = ifaddresses(nic_name).setdefault(AF_INET, [{'addr': 'No IP addr'}] )[0]['addr']
+    # ValueError if the nic_name is no correct
+    # TypeError is nic_name is None
+    except (ValueError, TypeError) as e:
+        nic_name = get_nic_name_from_system()
+        host = ifaddresses(nic_name).setdefault(AF_INET, [{'addr': 'No IP addr'}] )[0]['addr']
+
+    return(host)