Add provides and conflicts from parent lockfile to prevent installing the same package twice

src/AuthserverInstallerPlugin.php

@@ -23,12 +23,52 @@ namespace vierbergenlars\Authserver\Composer;
 
 use Composer\Composer;
 use Composer\IO\IOInterface;
+use Composer\Package\Link;
+use Composer\Package\Loader\ArrayLoader;
 use Composer\Plugin\PluginInterface;
+use Composer\Semver\Constraint\Constraint;
+use Composer\Semver\Constraint\MultiConstraint;
 
 class AuthserverInstallerPlugin implements PluginInterface
 {
     public function activate(Composer $composer, IOInterface $io)
     {
         $composer->getInstallationManager()->addInstaller(new AuthserverInstaller($io, $composer));
+        $this->overrideReplacesAndConflicts($composer);
+    }
+
+    private function overrideReplacesAndConflicts(Composer $composer)
+    {
+        $rootPackage = $composer->getPackage();
+        $extra = $rootPackage->getExtra();
+        $loader = new ArrayLoader();
+        $replaces = $rootPackage->getReplaces();
+        $conflicts = $rootPackage->getConflicts();
+
+        if(isset($extra['parent-lock-file'])) {
+            $lockfile = json_decode(file_get_contents($extra['parent-lock-file']), true);
+            foreach($lockfile['packages'] as $packageJson) {
+                $package = $loader->load($packageJson);
+                $constraint = new Constraint('=', $package->getVersion());
+                $replaces[$package->getName()] = new Link('__root_', $package->getName(), $constraint, 'replaces', $constraint->getPrettyString());
+                foreach($package->getProvides() as $provide)
+                    $replaces[$provide->getTarget()] = $provide;
+                foreach($package->getReplaces() as $replace)
+                    $replaces[$replace->getTarget()] = $replace;
+                foreach($package->getConflicts() as $conflict) {
+                    if(isset($conflicts[$conflict->getTarget()])) {
+                        $constraint = new MultiConstraint([
+                            $conflicts[$conflict->getTarget()]->getConstraint(),
+                            $conflict->getConstraint(),
+                        ], false);
+                        $conflict = new Link('__root__', $conflict->getTarget(), $constraint, 'conflicts', $constraint->getPrettyString());
+                    }
+                    $conflicts[$conflict->getTarget()] = $conflict;
+                }
+            }
+        }
+
+        $rootPackage->setReplaces($replaces);
+        $rootPackage->setConflicts($conflicts);
     }
 }