Fix some resourcewarnings in the test suite

setup/__init__.py

@@ -98,8 +98,9 @@ def initialize_constants():
     __version__ = '%s.%s.%s'%(nv.group(1), nv.group(2), nv.group(3))
     __appname__ = re.search(r'__appname__\s+=\s+(u{0,1})[\'"]([^\'"]+)[\'"]',
             src).group(2)
-    epsrc = re.compile(r'entry_points = (\{.*?\})', re.DOTALL).\
-            search(open(os.path.join(SRC, 'calibre/linux.py'), 'rb').read().decode('utf-8')).group(1)
+    with open(os.path.join(SRC, 'calibre/linux.py'), 'rb') as sf:
+        epsrc = re.compile(r'entry_points = (\{.*?\})', re.DOTALL).\
+                search(sf.read().decode('utf-8')).group(1)
     entry_points = eval(epsrc, {'__appname__': __appname__})
 
     def e2b(ep):

src/calibre/utils/lock.py

@@ -148,6 +148,7 @@ elif islinux:
         try:
             eintr_retry_call(sock.bind, address)
         except socket.error as err:
+            sock.close()
             if getattr(err, 'errno', None) == errno.EADDRINUSE:
                 return
             raise
@@ -181,6 +182,7 @@ else:
             eintr_retry_call(fcntl.lockf, f.fileno(), fcntl.LOCK_EX | fcntl.LOCK_NB)
             return partial(_clean_lock_file, f)
         except EnvironmentError as err:
+            f.close()
             if err.errno not in (errno.EAGAIN, errno.EACCES):
                 raise
 

src/calibre/utils/test_lock.py

@@ -130,6 +130,7 @@ class IPCLockTest(unittest.TestCase):
         while not os.path.exists('ready'):
             time.sleep(0.01)
         child.kill()
+        child.wait()
         release_mutex = create_single_instance_mutex('test')
         self.assertIsNotNone(release_mutex)
         release_mutex()
@@ -166,13 +167,22 @@ def other1():
 
 def other2():
     release_mutex = create_single_instance_mutex('test')
-    raise SystemExit(0 if release_mutex is None else 1)
+    if release_mutex is None:
+        ret = 0
+    else:
+        ret = 1
+        release_mutex()
+    raise SystemExit(ret)
 
 
 def other3():
-    create_single_instance_mutex('test')
-    os.mkdir('ready')
-    time.sleep(30)
+    release_mutex = create_single_instance_mutex('test')
+    try:
+        os.mkdir('ready')
+        time.sleep(30)
+    finally:
+        if release_mutex is not None:
+            release_mutex()
 
 
 def other4():