Make ical generation work without chdirs

chdir isn't something we need to be doing in Python
scripts, as we can and should use absolute or relative paths
in all cases. This will let us use paths passed to us in
config options later.

Change-Id: I3a5a950ab18931075767a81bbf727a5927b7a546

arbiter/const.py

@@ -26,8 +26,8 @@ WEEKDAYS = {'Monday': 0, 'Tuesday': 1, 'Wednesday': 2, 'Thursday': 3,
 
 SRC_DIR = project_dir
 
-DEFAULT_YAML_DIR = '../meetings'
-DEFAULT_ICAL_DIR = '../icals'
+DEFAULT_YAML_DIR = './meetings'
+DEFAULT_ICAL_DIR = './icals'
 # NOTE(jotan): The following publish URL is for testing purposes only.
 # It should be later changed to the official OpenStack Meetings Wiki.
 PUBLISH_URL = 'https://wiki.openstack.org/wiki/Meetings_Autogenerated'

arbiter/meeting.py

@@ -103,7 +103,6 @@ class Meeting:
 
         if not os.path.exists(ical_dir):
             os.makedirs(ical_dir)
-        os.chdir(ical_dir)
 
         with open(ical_filename, 'wb') as ics:
             ics.write(cal.to_ical())
@@ -111,7 +110,6 @@ class Meeting:
         num_events = len(cal.subcomponents)
         logging.info('\'%s\' processed. [%d event(s)]' % (ical_filename,
                                                           num_events))
-        os.chdir(const.SRC_DIR)
 
     def get_schedule_tuple(self):
         """returns a list of meeting tuples consisting meeting name, meeting

arbiter/util.py

@@ -36,17 +36,16 @@ def publish(meeting, ical):
 def load_meetings(yaml_dir, meeting_list=None):
     """Return a list of Meetings initialized from files in yaml_dir."""
 
-    os.chdir(yaml_dir)
-    if meeting_list:
-        meetings_yaml = [f for f in os.listdir()
-                         if os.path.isfile(f) and
-                         f.endswith(const.YAML_FILE_EXT) and
-                         f in meeting_list]
-    else:
-        meetings_yaml = [f for f in os.listdir()
-                         if os.path.isfile(f) and
-                         f.endswith(const.YAML_FILE_EXT)]
+    meetings_yaml = []
+    for file_name in os.listdir(yaml_dir):
+        yaml_file = os.path.join(yaml_dir, file_name)
+        if not os.path.isfile(yaml_file):
+            continue
+        if meeting_list and yaml_file not in meeting_list:
+            continue
+        meetings_yaml.append(yaml_file)
 
+    print meetings_yaml
     meetings = [Meeting(yaml.load(open(f, 'r')), f)
                 for f in meetings_yaml]
 
@@ -151,7 +150,6 @@ def _read_yaml_files(directory):
 
     """
 
-    os.chdir(directory)
     yaml_files = []
     for file in os.listdir('.'):
         if os.path.isfile(file) and file.endswith(const.YAML_FILE_EXT):
@@ -167,7 +165,6 @@ def _read_yaml_files(directory):
         for schedule in meeting.get_schedule_tuple():
             schedules.append(schedule)
 
-    os.chdir(const.SRC_DIR)
     return schedules