Integrate composer in the Travis build process

Creates a package definition from the framework version being built,
and uses composer to install it into an installer project, as well
as the required modules for testing.

.travis.yml

@@ -26,7 +26,7 @@ matrix:
 before_script:
  - pear install pear/PHP_CodeSniffer
  - phpenv rehash
- - ./tests/travis/before_script ~/builds/ss 
+ - ./tests/travis/before.php --target ~/builds/ss --version="2.5.x-dev" --installer="post-2.4"
  - cd ~/builds/ss
 
 script: 

tests/travis/before.php

@@ -0,0 +1,83 @@
+#!/usr/bin/env php
+<?php
+/**
+ * Initialises a test project that can be built by travis.
+ *
+ * The local framework checkout's composer file is parsed and used to built a
+ * custom local framework archive which is then installed into an installer
+ * base project.
+ */
+
+if (php_sapi_name() != 'cli') {
+	header('HTTP/1.0 404 Not Found');
+	exit;
+}
+
+$opts = getopt('', array(
+	'target:',
+	'version:',
+	'installer:'
+));
+
+if (!$opts) {
+	echo "Invalid arguments specified\n";
+	exit(1);
+}
+
+extract($opts);
+
+$dir = __DIR__;
+$framework = dirname(dirname($dir));
+$parent = dirname($framework);
+
+// Print out some environment information.
+printf("Database versions:\n");
+printf("  * MySQL:      %s\n", trim(`mysql --version`));
+printf("  * PostgreSQL: %s\n", trim(`pg_config --version`));
+printf("  * SQLite:     %s\n\n", trim(`sqlite3 -version`));
+
+// Extract the package info from the framework composer file, and build a
+// custom project composer file with the local package explicitly defined.
+echo "Reading composer information...\n";
+$package = json_decode(file_get_contents("$framework/composer.json"), true);
+
+// Override the default framework requirement with the one being built.
+$package += array(
+	'version' => $version,
+	'dist' => array(
+		'type' => 'tar',
+		'url' => "file://$parent/framework.tar"
+	)
+);
+
+// Generate a custom composer file.
+$composer = json_encode(array(
+	'repositories' => array(array('type' => 'package', 'package' => $package)),
+	'require' => array(
+		'silverstripe/framework' => $version,
+		'silverstripe/postgresql' => '*',
+		'silverstripe/sqlite3' => '*'
+	),
+	'minimum-stability' => 'dev'
+));
+
+echo "Generated composer file:\n";
+echo "$composer\n\n";
+
+echo "Archiving framework...\n";
+`cd $framework`;
+`tar -cf $parent/framework.tar .`;
+
+echo "Cloning installer@$installer...\n";
+`git clone --depth=100 --quiet -b $installer git://github.com/silverstripe/silverstripe-installer.git $target`;
+
+echo "Setting up project...\n";
+`cp $dir/_ss_environment.php $target`;
+`cp $dir/_config.php $target/mysite`;
+
+echo "Replacing composer file...\n";
+unlink("$target/composer.json");
+file_put_contents("$target/composer.json", $composer);
+
+echo "Running composer...\n";
+`composer install --dev -d $target`;

tests/travis/before_script

@@ -1,34 +0,0 @@
-#!/bin/sh
-
-### USAGE: before_script <base-folder> <travis-branch>
-
-BUILD_DIR=$1
-
-# Environment info
-echo "# Environment info"
-echo " - `php --version`"
-echo " - `mysql --version`"
-echo " - `pg_config --version`"
-echo " - SQLite3 `sqlite3 -version`"
-echo ""
-
-# Fetch all dependencies
-# TODO Replace with different composer.json variations
-
-echo "Checking out installer@$TRAVIS_BRANCH"
-git clone --depth=100 --quiet -b $TRAVIS_BRANCH git://github.com/silverstripe/silverstripe-installer.git $BUILD_DIR
-
-echo "Checking out sqlite3@master"
-git clone --depth=100 --quiet git://github.com/silverstripe-labs/silverstripe-sqlite3.git $BUILD_DIR/sqlite3
-
-echo "Checking out postgresql@master"
-git clone --depth=100 --quiet git://github.com/silverstripe/silverstripe-postgresql.git $BUILD_DIR/postgresql
-
-# Copy setup files
-cp ./tests/travis/_ss_environment.php $BUILD_DIR
-cp ./tests/travis/_config.php $BUILD_DIR/mysite
-
-# Copy actual project code into build directory (checked out by travis)
-cp -r . $BUILD_DIR/framework
-
-cd $BUILD_DIR