changing os.rename to shutil.move to close #65

Author: vsoch

examples/docker/Dockerfile

@@ -15,4 +15,5 @@ RUN /opt/conda/bin/pip install setuptools && \
     /opt/conda/bin/pip install -r requirements.txt && \
     /opt/conda/bin/pip install pyasn1==0.4.1 && \
     /opt/conda/bin/python setup.py sdist && \
-    /opt/conda/bin/python setup.py install
+    /opt/conda/bin/python setup.py install && \
+    apt-get clean

singularity/hub/__init__.py

@@ -27,6 +27,7 @@
 from requests.exceptions import HTTPError
 
 from singularity.logger import bot
+import shutil
 import requests
 import tempfile
 import json
@@ -154,7 +155,7 @@ def download(self,url,file_name,headers=None,show_progress=True):
         if isinstance(response, HTTPError):
             bot.error("Error downloading %s, exiting." %url)
             sys.exit(1)
-        os.rename(tmp_file, file_name)
+        shutil.move(tmp_file, file_name)
         return file_name