Add a dependencies hook for plugin dependency management

Makefile

@@ -19,7 +19,7 @@ endif
 all:
 	# Type "make install" to install.
 
-install: dependencies stack copyfiles plugins version
+install: dependencies stack copyfiles plugin-dependencies plugins version
 
 copyfiles: addman
 	cp dokku /usr/local/bin/dokku
@@ -34,6 +34,9 @@ addman:
 version:
 	git describe --tags > ${DOKKU_ROOT}/VERSION  2> /dev/null || echo '~${DOKKU_VERSION} ($(shell date -uIminutes))' > ${DOKKU_ROOT}/VERSION
 
+plugin-dependencies: pluginhook
+	dokku plugins-install-dependencies
+
 plugins: pluginhook docker
 	dokku plugins-install
 

dokku

@@ -108,6 +108,10 @@ case "$1" in
     pluginhook install
     ;;
 
+  plugins-install-dependencies)
+    pluginhook dependencies
+    ;;
+
   # temporary hack for https://github.com/progrium/dokku/issues/82
   deploy:all)
     for app in $(ls -d $DOKKU_ROOT/*/); do

plugins/nginx-vhosts/dependencies

@@ -0,0 +1,7 @@
+#!/bin/bash
+
+# latest stable NGINX 1.4.x with websocket support
+apt-get install -qq -y software-properties-common python-software-properties
+add-apt-repository -y ppa:nginx/stable
+apt-get update
+apt-get install -qq -y nginx dnsutils

plugins/nginx-vhosts/install

@@ -1,12 +1,6 @@
 #!/usr/bin/env bash
 set -eo pipefail; [[ $DOKKU_TRACE ]] && set -x
 
-# latest stable NGINX 1.4.x with websocket support
-apt-get install -qq -y software-properties-common python-software-properties
-add-apt-repository -y ppa:nginx/stable
-apt-get update
-apt-get install -qq -y nginx dnsutils
-
 if ! grep -q dokku-nginx-reload "/etc/sudoers"; then
   touch /etc/sudoers.tmp
   cp /etc/sudoers /tmp/sudoers.new