Add timeout to user agent detection, show where UA is stored.

.travis.yml

@@ -9,12 +9,12 @@ python:
 
 before_install:
 - pip install -U pip wheel setuptools
-
+ 
 install:
 - pip install -e .[dev]
 
 before_script:
-- ci/travis/before_script.sh
+- sh ci/travis/before_script.sh
 
 script:
 - python -m coverage run -m unittest discover -v

instalooter/_uadetect.py

@@ -55,7 +55,7 @@ def get_user_agent(port=None, cache=None):
     # Use webbrowser to connect to the server with the default browser
     webbrowser.open("http://localhost:{}/".format(port))
     # Wait for the request handler to get the request from the browser
-    user_agent = UserAgentRequestHandler.queue.get()
+    user_agent = UserAgentRequestHandler.queue.get(True, 5)
     # Close the server
     server.shutdown()
     server.server_close()

instalooter/looters.py

@@ -18,7 +18,7 @@
 import fs
 import six
 from requests import Session
-from six.moves.queue import Queue
+from six.moves.queue import Queue, Empty
 from six.moves.http_cookiejar import FileCookieJar, LWPCookieJar
 
 from . import __author__, __name__ as __appname__, __version__
@@ -69,10 +69,14 @@ def _user_agent(cls):
         """
         cache = cls._cachefs()
         if not cache.isfile(cls._USERAGENT_FILE):
-            ua = get_user_agent(cache=cache.getsyspath(cls._USERAGENT_FILE))
+            try:
+                ua = get_user_agent(cache=cache.getsyspath(cls._USERAGENT_FILE))
+            except Empty:
+                ua = None
             if ua is None:
-                warnings.warn("Could not detect user agent, using default")
                 ua = "Mozilla/5.0 (X11; Linux x86_64; rv:66.0) Gecko/20100101 Firefox/66.0"
+                warnings.warn("Could not detect user agent, using default: " + ua)
+                warnings.warn("User agent will be stored in file " + cache.getsyspath(cls._USERAGENT_FILE))
             with cache.open("user-agent.txt", "w") as f:
                 f.write(ua)
         with cache.open(cls._USERAGENT_FILE) as f: