fix download-release.sh

Download-release.sh was overwriting previous downloads
even if the temp URL had expired which resulted in the
release and binaries being overriden.

cluster/rackspace/cloud-config/master-cloud-config.yaml

@@ -23,12 +23,19 @@ write_files:
     permissions: 0755
     content: |
       #!/bin/bash
+      # This temp URL is only good for the length of time specified at cluster creation time.
+      # Afterward, it will result in a 403.
       OBJECT_URL="CLOUD_FILES_URL"
-      echo "Downloading release ($OBJECT_URL)"
-      wget "${OBJECT_URL}" -O /opt/kubernetes.tar.gz
-      echo "Unpacking release"
-      rm -rf /opt/kubernetes || false
-      tar xzf /opt/kubernetes.tar.gz -C /opt/
+      if [ ! -s /opt/kubernetes.tar.gz ]
+      then
+        echo "Downloading release ($OBJECT_URL)"
+        wget "${OBJECT_URL}" -O /opt/kubernetes.tar.gz
+        echo "Unpacking release"
+        rm -rf /opt/kubernetes || false
+        tar xzf /opt/kubernetes.tar.gz -C /opt/
+      else
+        echo "kubernetes release found. Skipping download."
+      fi
   - path: /opt/.kubernetes_auth
     permissions: 0600
     content: |

cluster/rackspace/util.sh

@@ -106,7 +106,8 @@ find-object-url() {
 
   KUBE_TAR=${CLOUDFILES_CONTAINER}/${CONTAINER_PREFIX}/kubernetes-server-linux-amd64.tar.gz
 
-  RELEASE_TMP_URL=$(swiftly -A ${OS_AUTH_URL} -U ${OS_USERNAME} -K ${OS_PASSWORD} tempurl GET ${KUBE_TAR})
+ # Create temp URL good for 24 hours
+  RELEASE_TMP_URL=$(swiftly -A ${OS_AUTH_URL} -U ${OS_USERNAME} -K ${OS_PASSWORD} tempurl GET ${KUBE_TAR} 86400 )
   echo "cluster/rackspace/util.sh: Object temp URL:"
   echo -e "\t${RELEASE_TMP_URL}"