* debian/config.yml.in: Make base data directory a template variable

@DATADIR_BASE@.
  * debian/pg_createconfig_patroni: Use data_directory setting from
    /etc/postgresql-common/createcluster.conf as DATADIR_BASE if set.

debian/changelog

@@ -5,6 +5,10 @@ patroni (2.0.1-3) UNRELEASED; urgency=medium
     be misleading.
   * debian/pg_clonecluster_patroni: After pg_dropcluster, remove
     postgresql.base.conf as well.
+  * debian/config.yml.in: Make base data directory a template variable
+    @DATADIR_BASE@.
+  * debian/pg_createconfig_patroni: Use data_directory setting from
+    /etc/postgresql-common/createcluster.conf as DATADIR_BASE if set.
 
  -- Debian PostgreSQL Maintainers <team+postgresql@tracker.debian.org>  Thu, 10 Dec 2020 13:33:54 +0100
 

debian/config.yml.in

@@ -97,7 +97,7 @@ postgresql:
   listen: "*:@PORT@"
   connect_address: @HOSTIP@:@PORT@
   use_unix_socket: true
-  data_dir: /var/lib/postgresql/@VERSION@/@CLUSTER@
+  data_dir: @DATADIR_BASE@/@VERSION@/@CLUSTER@
   bin_dir: /usr/lib/postgresql/@VERSION@/bin
   config_dir: /etc/postgresql/@VERSION@/@CLUSTER@
   pgpass: /var/lib/postgresql/@VERSION@-@CLUSTER@.pgpass

debian/pg_createconfig_patroni

@@ -91,6 +91,14 @@ fi
 # Postgres port.  2576 is 8008 - 5432.
 API_PORT=$((2576+$PORT))
 
+# set base data directory
+if [ -f /etc/postgresql-common/createcluster.conf ]; then
+    DATADIR_BASE=$(grep ^data_directory /etc/postgresql-common/createcluster.conf | sed -e 's/^[^\/]*\//\//g' -e 's/\%.*//' -e 's/\/$//')
+fi
+if [ -z "${DATADIR_BASE}" ]; then
+    DATADIR_BASE=/var/lib/postgresql
+fi
+
 # check DCS configuration
 if [ ! -f /etc/patroni/dcs.yml ]; then
     echo "DCS not configured yet, edit /etc/patroni/dcs.yml"
@@ -204,6 +212,7 @@ cat /etc/patroni/config.yml.in |		\
         -e "s/@HOSTNAME@/${HOSTNAME}/g"		\
         -e "s/@HOSTIP@/${HOSTIP}/g"		\
         -e "s/@LISTEN_VIP@/${LISTEN_VIP}/g"	\
+        -e "s#@DATADIR_BASE@#${DATADIR_BASE}#g"	\
         -e "s#@NETWORK@#${NETWORK}#g"		\
         -e "s/@API_PORT@/${API_PORT}/g"		\
         -e "s/@PORT@/${PORT}/g"			\