Binding IP of PG container is now configurable

Replace `PSQL_SC_BIND_EXTERNAL` with `PSQL_SC_BIND_IP`. See README for
instructions.

Closes #10

README.md

@@ -35,14 +35,14 @@ If you are using custom `PSQL_SC_ROOT` directory, make sure it is writable by
 dokku config:set --global PSQL_SC_ROOT=/my/custom/path
 ```
 
-### Binding Postgresql port to all interfaces
+### Binding Postgresql port to another IP
 
 By default, the container is not reachable from outside. The container can be
-reachable publicly by setting `PSQL_SC_BIND_EXTERNAL` to true in the global
-dokku config.
+bound to an IP of your choice by setting `PSQL_SC_BIND_IP` to an IP in the
+global dokku config.
 
 ```bash
-dokku config:set --global PSQL_SC_BIND_EXTERNAL=true
+dokku config:set --global PSQL_SC_BIND_IP=0.0.0.0
 ```
 
 ## Commands

commands

@@ -70,7 +70,7 @@ case "$1" in
       exit 0
     fi
     dokku_log_info1 "Starting Postgresql server"
-    docker run $(bind_external_options) -d -v "$PSQL_ROOT/data:/var/lib/postgresql/data" --name "$PSQL_CONTAINER_NAME" "$PSQL_IMAGE" > /dev/null
+    docker run $(bind_ip_options) -d -v "$PSQL_ROOT/data:/var/lib/postgresql/data" --name "$PSQL_CONTAINER_NAME" "$PSQL_IMAGE" > /dev/null
     ;;
 
   psql:restart)

functions

@@ -78,10 +78,10 @@ export_psql_root() {
   export PSQL_ROOT
 }
 
-bind_external_options() {
-  local BIND_EXTERNAL=$(dokku config:get --global PSQL_SC_BIND_EXTERNAL)
-  if [[ $BIND_EXTERNAL = 'true' ]]; then
-    echo "-p 0.0.0.0:$PSQL_PORT:$PSQL_PORT"
+bind_ip_options() {
+  local BIND_IP=$(dokku config:get --global PSQL_SC_BIND_IP)
+  if [[ -n $BIND_IP ]]; then
+    echo "-p $BIND_IP:$PSQL_PORT:$PSQL_PORT"
   else
     echo ''
   fi

install

@@ -8,4 +8,4 @@ mkdir -p "$PSQL_ROOT/data"
 chown dokku:dokku -R "$PSQL_ROOT" &> /dev/null || true
 PASSWORD=$(openssl rand -hex 32)
 export_psql_image
-docker run $(bind_external_options) -v "$PSQL_ROOT/data":/var/lib/postgresql/data -d -e POSTGRES_PASSWORD=$PASSWORD --name "$PSQL_CONTAINER_NAME" "$PSQL_IMAGE"
+docker run $(bind_ip_options) -v "$PSQL_ROOT/data":/var/lib/postgresql/data -d -e POSTGRES_PASSWORD=$PASSWORD --name "$PSQL_CONTAINER_NAME" "$PSQL_IMAGE"