Suppress require-dev hint when requiring things globally, fixes #12253

src/Composer/Command/RequireCommand.php

@@ -231,7 +231,7 @@ EOT
 
         $requirements = $this->formatRequirements($requirements);
 
-        if (!$input->getOption('dev') && $io->isInteractive()) {
+        if (!$input->getOption('dev') && $io->isInteractive() && !$composer->isGlobal()) {
             $devPackages = [];
             $devTags = ['dev', 'testing', 'static analysis'];
             $currentRequiresByKey = $this->getPackagesByRequireKey();

src/Composer/Factory.php

@@ -324,7 +324,9 @@ class Factory
 
         // Load config and override with local config/auth config
         $config = static::createConfig($io, $cwd);
+        $isGlobal = $localConfigSource !== Config::SOURCE_UNKNOWN && realpath($config->get('home')) === realpath(dirname($localConfigSource));
         $config->merge($localConfig, $localConfigSource);
+
         if (isset($composerFile)) {
             $io->writeError('Loading config file ' . $composerFile .' ('.realpath($composerFile).')', true, IOInterface::DEBUG);
             $config->setConfigSource(new JsonConfigSource(new JsonFile(realpath($composerFile), null, $io)));
@@ -346,6 +348,9 @@ class Factory
         // initialize composer
         $composer = $fullLoad ? new Composer() : new PartialComposer();
         $composer->setConfig($config);
+        if ($isGlobal) {
+            $composer->setGlobal();
+        }
 
         if ($fullLoad) {
             // load auth configs into the IO instance
@@ -429,14 +434,14 @@ class Factory
 
         if ($composer instanceof Composer) {
             $globalComposer = null;
-            if (realpath($config->get('home')) !== $cwd) {
+            if (!$composer->isGlobal()) {
                 $globalComposer = $this->createGlobalComposer($io, $config, $disablePlugins, $disableScripts);
             }
 
             $pm = $this->createPluginManager($io, $composer, $globalComposer, $disablePlugins);
             $composer->setPluginManager($pm);
 
-            if (realpath($config->get('home')) === $cwd) {
+            if ($composer->isGlobal()) {
                 $pm->setRunningInGlobalDir(true);
             }
 

src/Composer/PartialComposer.php

@@ -23,6 +23,11 @@ use Composer\EventDispatcher\EventDispatcher;
  */
 class PartialComposer
 {
+    /**
+     * @var bool
+     */
+    private $global = false;
+
     /**
      * @var RootPackageInterface
      */
@@ -112,4 +117,14 @@ class PartialComposer
     {
         return $this->eventDispatcher;
     }
+
+    public function isGlobal(): bool
+    {
+        return $this->global;
+    }
+
+    public function setGlobal(): void
+    {
+        $this->global = true;
+    }
 }