Create transient config provider, temp dir logic

Allows us to have a new config provider for each setup, with no overlap
of the directories used, and automatic cleanup of those directories.

config_app/config_endpoints/api/tar_config_loader.py

@@ -1,4 +1,5 @@
 import os
+import tempfile
 import tarfile
 
 from flask import request, make_response, send_file
@@ -9,6 +10,19 @@ from util.config.validator import EXTRA_CA_DIRECTORY
 from config_app.c_app import app, config_provider
 from config_app.config_endpoints.api import resource, ApiResource, nickname
 
+@resource('/v1/configapp/initialization')
+class ConfigInitialization(ApiResource):
+    """
+    Resource for dealing with any initialization logic for the config app
+    """
+
+    @nickname('scStartNewConfig')
+    def get(self):
+        config_provider.new_config_dir()
+
+        return make_response('OK')
+
+
 @resource('/v1/configapp/tarconfig')
 class TarConfigLoader(ApiResource):
     """
@@ -18,7 +32,7 @@ class TarConfigLoader(ApiResource):
 
     @nickname('scGetConfigTarball')
     def get(self):
-        config_path = config_provider.config_volume
+        config_path = config_provider.get_config_dir_path()
 
         # remove the initial trailing / from the prefix path, and add the last dir one
         tar_dir_prefix = config_path[1:] + '/'
@@ -33,28 +47,28 @@ class TarConfigLoader(ApiResource):
 
             return tarinfo
 
-        # Remove the tar if it already exists so we don't write on top of existing tarball
-        if os.path.isfile('quay-config.tar.gz'):
-            os.remove('quay-config.tar.gz')
+        temp = tempfile.NamedTemporaryFile()
 
-        tar = tarfile.open('quay-config.tar.gz', mode="w|gz")
+        tar = tarfile.open(temp.name, mode="w|gz")
 
         for name in os.listdir(config_path):
             tar.add(os.path.join(config_path, name), filter=tarinfo_filter)
 
         tar.close()
 
-        return send_file('quay-config.tar.gz', mimetype='application/gzip')
+        return send_file(temp.name, mimetype='application/gzip')
 
     @nickname('scUploadTarballConfig')
     def put(self):
         """ Loads tarball config into the config provider """
+        # Generate a new empty dir to load the config into
+        config_provider.new_config_dir()
+
         input_stream = request.stream
         with tarfile.open(mode="r|gz", fileobj=input_stream) as tar_stream:
-            # TODO: find a way to remove the contents of the directory on shutdown?
-            tar_stream.extractall(config_provider.config_volume)
+            tar_stream.extractall(config_provider.get_config_dir_path())
 
-        # now try to connect to the db provided in their config
+        # now try to connect to the db provided in their config to validate it works
         combined = dict(**app.config)
         combined.update(config_provider.get_config())