diff --git a/ctl b/ctl
index 8195061..da49820 100755
--- a/ctl
+++ b/ctl
@@ -56,7 +56,7 @@ else
             ARCH="_armv7l"
         fi
         PLATFORM="linux$ARCH"
-        if [ -e "$BASE/platform_${PLATFORM}/lib/libunrar.so" ]; then
+        if [ -e $BASE/platform_${PLATFORM}/lib/libunrar.so ]; then
             export UNRAR_LIB_PATH="$BASE/platform_${PLATFORM}/lib/libunrar.so"
         fi
     fi
diff --git a/oml/item/models.py b/oml/item/models.py
index 72d6b8e..a2b200a 100644
--- a/oml/item/models.py
+++ b/oml/item/models.py
@@ -843,17 +843,15 @@ def download_cover(id):
             url = i.meta.get('cover')
         else:
             url = None
-            cover = None
 
     logger.debug('download cover %s %s', id, url)
     ratio = None
-    if url:
-        try:
-            cover = ox.net.read_url(url)
-            ratio = get_ratio(cover)
-        except:
-            logger.debug('unable to read cover url %s', url)
-            cover = None
+    try:
+        cover = ox.net.read_url(url)
+        ratio = get_ratio(cover)
+    except:
+        logger.debug('unable to read cover url %s', url)
+        cover = None
     with db.session():
         i = Item.get(id, for_update=True)
         if i:
diff --git a/oml/media/cbz.py b/oml/media/cbz.py
index 60f0672..b08c972 100644
--- a/oml/media/cbz.py
+++ b/oml/media/cbz.py
@@ -1,14 +1,9 @@
 # -*- coding: utf-8 -*-
 import os
 import zipfile
-import logging
 
 import ox
 
-
-logger = logging.getLogger(__name__)
-
-
 def cover(path):
     data = None
     logger.debug('cover %s', path)
diff --git a/oml/media/epub.py b/oml/media/epub.py
index 552a134..cd5a6f0 100644
--- a/oml/media/epub.py
+++ b/oml/media/epub.py
@@ -153,7 +153,7 @@ def info(epub):
                             contents.append(txt)
                 if contents:
                     data['tableofcontents'] = '\n'.join(contents).strip()
-        if 'tableofcontents' not in data:
+        if not 'tableofcontents' in data:
             guide = info.find('{http://www.idpf.org/2007/opf}guide')
             if guide:
                 for ref in guide.findall('{http://www.idpf.org/2007/opf}reference'):
@@ -169,7 +169,7 @@ def info(epub):
         data['description'] = strip_tags(decode_html(data['description']))
     text = extract_text(epub)
     data['textsize'] = len(text)
-    if 'isbn' not in data:
+    if not 'isbn' in data:
         isbn = extract_isbn(text)
         if isbn:
             data['isbn'] = isbn
diff --git a/oml/media/pdf.py b/oml/media/pdf.py
index 75313b2..bc342d0 100644
--- a/oml/media/pdf.py
+++ b/oml/media/pdf.py
@@ -237,13 +237,10 @@ def info(pdf):
 def extract_text(pdf):
     if sys.platform == 'win32':
         pdf = get_short_path_name(pdf)
-    cmd = ['pdftotext', pdf, '-']
     if sys.platform == 'darwin':
-        pdftotext = ['/usr/local/bin/pdftotext', pdf, '-']
-        if os.path.exists(pdftotext[0]):
-            cmd = pdftotext
-        else:
-            cmd = ['/usr/bin/mdimport', '-d2', pdf]
+        cmd = ['/usr/bin/mdimport', '-d2', pdf]
+    else:
+        cmd = ['pdftotext', pdf, '-']
     if sys.platform == 'win32':
         startupinfo = subprocess.STARTUPINFO()
         startupinfo.dwFlags |= subprocess.STARTF_USESHOWWINDOW
@@ -254,7 +251,7 @@ def extract_text(pdf):
     stdout, stderr = p.communicate()
     stdout = stdout.decode()
     stderr = stderr.decode()
-    if sys.platform == 'darwin' and cmd[0] == '/usr/bin/mdimport':
+    if sys.platform == 'darwin':
         if 'kMDItemTextContent' in stderr:
             stdout = stderr.split('kMDItemTextContent = "')[-1].split('\n')[0][:-2]
         else:
diff --git a/oml/tasks.py b/oml/tasks.py
index 93d3b45..3f97379 100644
--- a/oml/tasks.py
+++ b/oml/tasks.py
@@ -36,10 +36,7 @@ class Tasks(Thread):
 
     def run(self):
         self.load_tasks()
-        if time.mktime(time.gmtime()) - settings.server.get('last_scan', 0) > 24*60*60:
-            settings.server['last_scan'] = time.mktime(time.gmtime())
-            self.queue('scan')
-
+        self.queue('scan')
         import item.scan
         from item.models import sync_metadata, get_preview, get_cover
         from user.models import (