create install_default_policy

Recent versions of oslo policy allow the use of a policy.d to break up
policy in a more user understandable way. Nova is going to use this in
Kilo to break out v2 and v2.1 API policy definitions.

This provides a unified helper for installing sample policies. It
makes some assumptions on project directory structure. Porting other
projects to use this can happen in the future.

Change-Id: Iec23b095176332414faf76a9c329f8bb5f3aa6c3

functions-common

@@ -787,6 +787,28 @@ function get_field {
     done
 }
 
+# install default policy
+# copy over a default policy.json and policy.d for projects
+function install_default_policy {
+    local project=$1
+    local project_uc=$(echo $1|tr a-z A-Z)
+    local conf_dir="${project_uc}_CONF_DIR"
+    # eval conf dir to get the variable
+    conf_dir="${!conf_dir}"
+    local project_dir="${project_uc}_DIR"
+    # eval project dir to get the variable
+    project_dir="${!project_dir}"
+    local sample_conf_dir="${project_dir}/etc/${project}"
+    local sample_policy_dir="${project_dir}/etc/${project}/policy.d"
+
+    # first copy any policy.json
+    cp -p $sample_conf_dir/policy.json $conf_dir
+    # then optionally copy over policy.d
+    if [[ -d $sample_policy_dir ]]; then
+        cp -r $sample_policy_dir $conf_dir/policy.d
+    fi
+}
+
 # Add a policy to a policy.json file
 # Do nothing if the policy already exists
 # ``policy_add policy_file policy_name policy_permissions``

lib/nova

@@ -261,7 +261,7 @@ function configure_nova {
     fi
     sudo chown $STACK_USER $NOVA_CONF_DIR
 
-    cp -p $NOVA_DIR/etc/nova/policy.json $NOVA_CONF_DIR
+    install_default_policy nova
 
     configure_nova_rootwrap