when no cfg file is there, create it

cfg/linse-box2_5b2a64.cfg

@@ -0,0 +1,10 @@
+[NETWORK]
+; please refer to README.md for help
+eth0=wan
+eth1=192.168.2.2
+eth2=192.168.3.3
+eth3=192.168.127.254
+
+[ROUTER]
+; please refer to README.md for help
+3001=192.168.127.254:3001

install.py

@@ -475,6 +475,8 @@ def handle_config():
         cfgfile = BoxInfo.CFGPATH % (newhostname, box.id)
         with open(cfgfile, 'w') as f:
             f.write(template)
+        config = box.read_config()
+        cfgfile = box.cfgfile
     if box.hostname_changed or cfgfile != BoxInfo.CFGPATH % (newhostname, box.id):
         box.hostname_changed = True
         if cfgfile:

utils.py

@@ -56,10 +56,14 @@ class BoxInfo:
 
     def read_config(self, section=None):
         cfgfiles = glob(self.CFGPATH % ('*', self.id))
-        if len(cfgfiles) != 1:
-            raise ValueError('there must be one and only one single cfgfile %r' % cfgfiles)
+        if len(cfgfiles) > 1:
+            raise ValueError('ambiguous cfgfile: %r' % cfgfiles)
+        if section and not cfgfiles:
+            raise ValueError('no cfg file found for %s' % self.id)
         if cfgfiles:
             self.cfgfile = cfgfiles[0]
+        else:
+            return {}
         parser = ConfigParser()
         parser.read(self.cfgfile)
         if section: