Fix ProcessExecutor bootstrapping, fixes #10703

src/Composer/Command/CreateProjectCommand.php

@@ -235,7 +235,7 @@ EOT
             }
         }
 
-        $process = new ProcessExecutor($io);
+        $process = $composer->getLoop()->getProcessExecutor();
         $fs = new Filesystem($process);
 
         // dispatch event

src/Composer/Command/DiagnoseCommand.php

@@ -80,6 +80,9 @@ EOT
 
             $io->write('Checking composer.json: ', false);
             $this->outputResult($this->checkComposerSchema());
+            $this->process = $composer->getLoop()->getProcessExecutor() ?? new ProcessExecutor($io);
+        } else {
+            $this->process = new ProcessExecutor($io);
         }
 
         if ($composer) {
@@ -92,7 +95,6 @@ EOT
         $config->prohibitUrlByConfig('http://repo.packagist.org', new NullIO);
 
         $this->httpDownloader = Factory::createHttpDownloader($io, $config);
-        $this->process = new ProcessExecutor($io);
 
         $io->write('Checking platform settings: ', false);
         $this->outputResult($this->checkPlatform());

src/Composer/Command/StatusCommand.php

@@ -96,7 +96,7 @@ EOT
         $vcsVersionChanges = array();
 
         $parser = new VersionParser;
-        $guesser = new VersionGuesser($composer->getConfig(), new ProcessExecutor($io), $parser);
+        $guesser = new VersionGuesser($composer->getConfig(), $composer->getLoop()->getProcessExecutor() ?? new ProcessExecutor($io), $parser);
         $dumper = new ArrayDumper;
 
         // list packages

src/Composer/Downloader/FileDownloader.php

@@ -89,7 +89,7 @@ class FileDownloader implements DownloaderInterface, ChangeReportInterface
         $this->eventDispatcher = $eventDispatcher;
         $this->httpDownloader = $httpDownloader;
         $this->cache = $cache;
-        $this->process = $process ?: new ProcessExecutor($io);
+        $this->process = $process ?? new ProcessExecutor($io);
         $this->filesystem = $filesystem ?: new Filesystem($this->process);
 
         if ($this->cache && $this->cache->gcIsNecessary()) {

src/Composer/Downloader/VcsDownloader.php

@@ -45,8 +45,8 @@ abstract class VcsDownloader implements DownloaderInterface, ChangeReportInterfa
     {
         $this->io = $io;
         $this->config = $config;
-        $this->process = $process ?: new ProcessExecutor($io);
-        $this->filesystem = $fs ?: new Filesystem($this->process);
+        $this->process = $process ?? new ProcessExecutor($io);
+        $this->filesystem = $fs ?? new Filesystem($this->process);
     }
 
     /**

src/Composer/EventDispatcher/EventDispatcher.php

@@ -71,7 +71,7 @@ class EventDispatcher
     {
         $this->composer = $composer;
         $this->io = $io;
-        $this->process = $process ?: new ProcessExecutor($io);
+        $this->process = $process ?? new ProcessExecutor($io);
         $this->eventStack = array();
     }
 

src/Composer/Package/Locker.php

@@ -68,7 +68,7 @@ class Locker
         $this->contentHash = self::getContentHash($composerFileContents);
         $this->loader = new ArrayLoader(null, true);
         $this->dumper = new ArrayDumper();
-        $this->process = $process ?: new ProcessExecutor($io);
+        $this->process = $process ?? new ProcessExecutor($io);
     }
 
     /**

src/Composer/Platform/HhvmDetector.php

@@ -54,7 +54,7 @@ class HhvmDetector
             $this->executableFinder = $this->executableFinder ?: new ExecutableFinder();
             $hhvmPath = $this->executableFinder->find('hhvm');
             if ($hhvmPath !== null) {
-                $this->processExecutor = $this->processExecutor ?: new ProcessExecutor();
+                $this->processExecutor = $this->processExecutor ?? new ProcessExecutor();
                 $exitCode = $this->processExecutor->execute(
                     ProcessExecutor::escape($hhvmPath).
                     ' --php -d hhvm.jit=0 -r "echo HHVM_VERSION;" 2>/dev/null',

src/Composer/Repository/RepositoryManager.php

@@ -51,7 +51,7 @@ class RepositoryManager
         $this->config = $config;
         $this->httpDownloader = $httpDownloader;
         $this->eventDispatcher = $eventDispatcher;
-        $this->process = $process ?: new ProcessExecutor($io);
+        $this->process = $process ?? new ProcessExecutor($io);
     }
 
     /**

src/Composer/Repository/VcsRepository.php

@@ -99,7 +99,7 @@ class VcsRepository extends ArrayRepository implements ConfigurableRepositoryInt
         $this->repoConfig = $repoConfig;
         $this->versionCache = $versionCache;
         $this->httpDownloader = $httpDownloader;
-        $this->processExecutor = $process ?: new ProcessExecutor($io);
+        $this->processExecutor = $process ?? new ProcessExecutor($io);
     }
 
     public function getRepoName()