[HACK] Install solr extension from source

Resolves solr issue in moodlehq#16, waiting for the upstream as described in moodlehq#19

root/tmp/setup/php-extensions.sh

@@ -35,7 +35,8 @@ docker-php-ext-configure ldap --with-libdir=lib/x86_64-linux-gnu/
 docker-php-ext-install -j$(nproc) ldap
 
 pecl install memcached redis apcu igbinary
-docker-php-ext-enable memcached redis apcu igbinary
+/tmp/setup/solr-extension.sh
+docker-php-ext-enable solr memcached redis apcu igbinary
 
 echo 'apc.enable_cli = On' >> /usr/local/etc/php/conf.d/docker-php-ext-apcu.ini
 

root/tmp/setup/solr-extension.sh

@@ -0,0 +1,36 @@
+#!/usr/bin/env bash
+
+set -e
+
+# HACK Install solr directly from git since the latest source tarball from PECL, 2.4.0, is outdated (2016-03-30).
+# Ref: https://bugs.php.net/bug.php?id=75631
+# At the time of writing this script the latest commit in the source, https://github.com/php/pecl-search_engine-solr/,
+# is de1d724299780d927cb9ed14268449ac8a28204b, dated 2017-09-07.
+hash=de1d724299780d927cb9ed14268449ac8a28204b
+
+# Download our 'tagged' source code from git.
+echo "Downloading solr extension source archive (${hash})"
+curl --location \
+	https://github.com/php/pecl-search_engine-solr/archive/${hash}.tar.gz \
+	-o /tmp/pecl-search_engine-solr-${hash}.tar.gz
+# Extract the compressed archive.
+cd /tmp
+tar -xvzf pecl-search_engine-solr-${hash}.tar.gz
+cd pecl-search_engine-solr-${hash}
+
+# Compile the extension as required by a manual PECL installation.
+echo "Compile solr extension"
+phpize
+./configure
+make
+# Finally, install it.
+echo "Install solr extension"
+make install
+
+# Remove all the sources.
+echo "Cleanup temporary folder and files"
+rm /tmp/pecl-search_engine-solr-${hash} -rf
+rm /tmp/pecl-search_engine-solr-${hash}.tar.gz -f
+
+# Done with this hack.
+# Please, follow https://github.com/moodlehq/moodle-php-apache/issues/19.