From 270c7c3262b928835b78c2c809cb51aaabfe4fed Mon Sep 17 00:00:00 2001
From: Alessandro Lai <alessandro.lai85@gmail.com>
Date: Tue, 28 Apr 2020 16:04:00 +0200
Subject: [PATCH 1/2] Backport validation support for composer-runtime-api
 (#8842)

Fixes #8841
---
 src/Composer/Repository/PlatformRepository.php                  | 2 +-
 .../Composer/Test/Package/Loader/ValidatingArrayLoaderTest.php  | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/Composer/Repository/PlatformRepository.php b/src/Composer/Repository/PlatformRepository.php
index 265cdbf4a..1426d4a16 100644
--- a/src/Composer/Repository/PlatformRepository.php
+++ b/src/Composer/Repository/PlatformRepository.php
@@ -27,7 +27,7 @@ use Symfony\Component\Process\ExecutableFinder;
  */
 class PlatformRepository extends ArrayRepository
 {
-    const PLATFORM_PACKAGE_REGEX = '{^(?:php(?:-64bit|-ipv6|-zts|-debug)?|hhvm|(?:ext|lib)-[a-z0-9](?:[_.-]?[a-z0-9]+)*|composer-plugin-api)$}iD';
+    const PLATFORM_PACKAGE_REGEX = '{^(?:php(?:-64bit|-ipv6|-zts|-debug)?|hhvm|(?:ext|lib)-[a-z0-9](?:[_.-]?[a-z0-9]+)*|composer-(?:plugin|runtime)-api)$}iD';
 
     private $versionParser;
 
diff --git a/tests/Composer/Test/Package/Loader/ValidatingArrayLoaderTest.php b/tests/Composer/Test/Package/Loader/ValidatingArrayLoaderTest.php
index 9dabb23b7..e1ce9264a 100644
--- a/tests/Composer/Test/Package/Loader/ValidatingArrayLoaderTest.php
+++ b/tests/Composer/Test/Package/Loader/ValidatingArrayLoaderTest.php
@@ -86,6 +86,7 @@ class ValidatingArrayLoaderTest extends TestCase
                         'a/b' => '1.*',
                         'b/c' => '~2',
                         'example' => '>2.0-dev,<2.4-dev',
+                        'composer-runtime-api' => '*',
                     ),
                     'require-dev' => array(
                         'a/b' => '1.*',

From ff05150c4e1514c452be03b86974fbc891942156 Mon Sep 17 00:00:00 2001
From: Alessandro Lai <alessandro.lai85@gmail.com>
Date: Wed, 29 Apr 2020 08:55:58 +0200
Subject: [PATCH 2/2] Add composer-runtime-api version constant

---
 src/Composer/Composer.php                      | 11 +++++++++++
 src/Composer/Repository/PlatformRepository.php |  7 +++++++
 2 files changed, 18 insertions(+)

diff --git a/src/Composer/Composer.php b/src/Composer/Composer.php
index 99f4756b0..a879a0dae 100644
--- a/src/Composer/Composer.php
+++ b/src/Composer/Composer.php
@@ -55,6 +55,17 @@ class Composer
     const RELEASE_DATE = '@release_date@';
     const SOURCE_VERSION = '1.10-dev+source';
 
+    /**
+     * Version number of the internal composer-runtime-api package
+     *
+     * This is used to version features available to projects at runtime
+     * like the platform-check file, the Composer\InstalledVersions class
+     * and possibly others in the future.
+     *
+     * @var string
+     */
+    const RUNTIME_API_VERSION = '1.0.0';
+
     public static function getVersion()
     {
         // no replacement done, this must be a source checkout
diff --git a/src/Composer/Repository/PlatformRepository.php b/src/Composer/Repository/PlatformRepository.php
index 1426d4a16..ecd4ca256 100644
--- a/src/Composer/Repository/PlatformRepository.php
+++ b/src/Composer/Repository/PlatformRepository.php
@@ -12,6 +12,7 @@
 
 namespace Composer\Repository;
 
+use Composer\Composer;
 use Composer\Package\CompletePackage;
 use Composer\Package\PackageInterface;
 use Composer\Package\Version\VersionParser;
@@ -74,6 +75,12 @@ class PlatformRepository extends ArrayRepository
         $composerPluginApi->setDescription('The Composer Plugin API');
         $this->addPackage($composerPluginApi);
 
+        $prettyVersion = Composer::RUNTIME_API_VERSION;
+        $version = $this->versionParser->normalize($prettyVersion);
+        $composerRuntimeApi = new CompletePackage('composer-runtime-api', $version, $prettyVersion);
+        $composerRuntimeApi->setDescription('The Composer Runtime API');
+        $this->addPackage($composerRuntimeApi);
+
         try {
             $prettyVersion = PHP_VERSION;
             $version = $this->versionParser->normalize($prettyVersion);