* debian/pg_createconfig_patroni: Add --port option and automatically assign

the next free pg-common port if not specified.

debian/changelog

@@ -3,6 +3,8 @@ patroni (1.5.3-3) UNRELEASED; urgency=medium
   [ Michael Banck ]
   * debian/README.Debian: New file (Closes: #916186).
   * debian/config.yml.in: Add @PORT@ option.
+  * debian/pg_createconfig_patroni: Add --port option and automatically assign
+    the next free pg-common port if not specified.
 
  -- Debian PostgreSQL Maintainers <team+postgresql@tracker.debian.org>  Mon, 14 Jan 2019 22:29:11 +0100
 

debian/pg_createconfig_patroni

@@ -11,6 +11,10 @@ case $i in
     HOSTIP="${i#*=}"
     shift # past argument=value
     ;;
+    --port=*)
+    PORT="${i#*=}"
+    shift # past argument=value
+    ;;
     --force)
     FORCE="y"
     shift # past argument=value
@@ -26,6 +30,14 @@ if [ -z "$SCOPE" ]; then
     exit 1
 fi
 
+if [ -z "$PORT" ]; then
+    # try to guess next free port
+    PORT=$(($(pg_lsclusters | awk '{print $3}' | grep -v Port | sort -n | tail -1) + 1))
+else
+    # validate specified port
+    pg_lsclusters | awk '{print $3}' | grep -q $PORT && (echo "Port $PORT already in use"; exit 1)
+fi
+
 # support both '-' and '/' as separator
 if [ $(echo $SCOPE | grep -- -) ]
 then
@@ -78,6 +90,7 @@ cat /etc/patroni/config.yml.in |	\
     sed -e s/@VERSION@/${VERSION}/g	\
         -e s/@CLUSTER@/${CLUSTER}/g	\
         -e s/@HOSTIP@/${HOSTIP}/g	\
+        -e s/@PORT@/${PORT}/g		\
 >> $CONFIG_FILE
 
 # Set permissions