Rebuild of Dockerfile

Refactored the Dockerfile to use wget for fetching simplesamlphp package and combined many of the RUN commands into single exec chained RUN commands (to minimise docker image layering).

Author: dancallan

Dockerfile

@@ -3,28 +3,28 @@ MAINTAINER Ian Blenke <ian@blenke.com>
 
 env VERSION 1.13.2
 
-RUN curl https://github.com/simplesamlphp/simplesamlphp/releases/download/v$VERSION/simplesamlphp-$VERSION.tar.gz | tar xvzf - --strip-components 1 -C /var/www/html
-
 WORKDIR /var/www/html
 
-RUN cp -r config-templates/* config/
-RUN cp -r metadata-templates/* metadata/
+RUN apt-get update -y && \
+    apt-get install -y wget && \
+    wget https://github.com/simplesamlphp/simplesamlphp/releases/download/v$VERSION/simplesamlphp-$VERSION.tar.gz && \ 
+    tar xvzf simplesamlphp-$VERSION.tar.gz --strip-components 1 -C /var/www/html
+
+RUN cp -r config-templates/* config/ && cp -r metadata-templates/* metadata/
 
 VOLUME /var/www/html/config
 VOLUME /var/www/html/metadata
 
 # Install the gmp and mcrypt extensions
-RUN apt-get update -y
-RUN apt-get install -y libgmp-dev re2c libmhash-dev libmcrypt-dev file
-RUN ln -s /usr/include/x86_64-linux-gnu/gmp.h /usr/local/include/
-RUN docker-php-ext-configure gmp 
-RUN docker-php-ext-install gmp
-RUN docker-php-ext-configure mcrypt
-RUN docker-php-ext-install mcrypt
-
-RUN echo extension=gmp.so > $PHP_INI_DIR/conf.d/gmp.ini
-RUN echo extension=mcrypt.so > $PHP_INI_DIR/conf.d/mcrypt.ini
+RUN apt-get update -y && \
+    apt-get install -y libgmp-dev re2c libmhash-dev libmcrypt-dev file && \
+    ln -s /usr/include/x86_64-linux-gnu/gmp.h /usr/local/include/ && \
+    docker-php-ext-configure gmp && \
+    docker-php-ext-install gmp && \
+    docker-php-ext-configure mcrypt && \
+    docker-php-ext-install mcrypt && \
+    echo extension=gmp.so > $PHP_INI_DIR/conf.d/gmp.ini && \
+    echo extension=mcrypt.so > $PHP_INI_DIR/conf.d/mcrypt.ini
 
 RUN curl -sS https://getcomposer.org/installer | php
 RUN php composer.phar install
-