Add COLLECTD_CONF_DIR config option

Add COLLECTD_CONF_DIR config option so that a non-default config
dir can be specified for collectd.

Closes-Bug #1583282

Change-Id: Ic697b9e35f6d3b063e53dca2cb44fa24f8be3598

devstack/libs/collectd

@@ -3,13 +3,6 @@
 # common functions for collectd ceilometer plugin
 # -----------------------------------------------
 
-if is_ubuntu; then
-    COLLECTD_CONF_DIR=/etc/collectd/collectd.conf.d
-elif is_fedora; then
-    COLLECTD_CONF_DIR=/etc/collectd.d
-fi
-
-
 # start/stop service
 #
 function start_collectd {

devstack/settings

@@ -2,6 +2,7 @@
 COLLECTD_DIR=$( cd "$( dirname "${BASH_SOURCE[0]}" )" && cd .. && pwd )
 COLLECTD_BATCH_SIZE=${COLLECTD_BATCH_SIZE:-3}
 COLLECTD_INSTALL=${COLLECTD_INSTALL:-True}
+COLLECTD_CONF_DIR=${COLLECTD_CONF_DIR:-''}
 
 # Ceilometer connection info.
 CEILOMETER_URL_TYPE=${CEILOMETER_URL_TYPE:-internalURL}
@@ -12,5 +13,12 @@ OS_AUTH_URL="$KEYSTONE_AUTH_URI/v$IDENTITY_API_VERSION"
 OS_USERNAME="ceilometer"
 OS_PASSWORD=${SERVICE_PASSWORD}
 
-
+# Fall back to default conf dir if option is unset
+if [ -z $COLLECTD_CONF_DIR ]; then
+    if is_ubuntu; then
+        COLLECTD_CONF_DIR=/etc/collectd/collectd.conf.d
+    elif is_fedora; then
+        COLLECTD_CONF_DIR=/etc/collectd.d
+    fi
+fi
 

doc/source/usage.rst

@@ -12,6 +12,13 @@ To use collectd-ceilometer-plugin in collectd::
 local.conf settings
 -------------------
 
+COLLECTD_CONF_DIR
+    (directory) Specify a directory where collectd conf files reside.
+    This is required if you use a distro other than Ubuntu or Fedora, or if
+    the config file is in a non default location.
+    Default: /etc/collectd/collectd.conf.d (Ubuntu) /etc/collect.d (Fedora)
+
+
 COLLECTD_INSTALL
     (True|False) Indicates whether to install collectd from package manager.
     Set this to False if you are running a custom collectd build or do not