Fix #585.

Use /sys/class/net/IFACE/address for the MAC address instead of the ip
command.

.gitignore

@@ -6,4 +6,7 @@
 
 # Cache
 /DeDRM_plugin/__pycache__
-/DeDRM_plugin/standalone/__pycache__
+/DeDRM_plugin/standalone/__pycache__
+
+# zip from make_release.py
+/DeDRM_tools.zip

Obok_plugin/obok/obok.py

@@ -449,9 +449,15 @@ class KoboLibrary(object):
             for m in matches:
                 # print "m:{0}".format(m[0])
                 macaddrs.append(m[0].upper())
+        elif sys.platform.startswith('linux'):
+            for interface in os.listdir('/sys/class/net'):
+                with open('/sys/class/net/' + interface + '/address', 'r') as f:
+                    mac = f.read().strip().upper()
+                # some interfaces, like Tailscale's VPN interface, do not have a MAC address
+                if mac != '':
+                    macaddrs.append(mac)
         else:
-            # probably linux
-
+            # final fallback
             # let's try ip
             c = re.compile('\s(' + '[0-9a-f]{2}:' * 5 + '[0-9a-f]{2})(\s|$)', re.IGNORECASE)
             for line in os.popen('ip -br link'):