Avoid formatting output from external processes, fixes #8524

src/Composer/IO/BaseIO.php

@@ -65,6 +65,22 @@ abstract class BaseIO implements IOInterface, LoggerInterface
         $this->authentications[$repositoryName] = array('username' => $username, 'password' => $password);
     }
 
+    /**
+     * {@inheritDoc}
+     */
+    public function writeRaw($messages, $newline = true, $verbosity = self::NORMAL)
+    {
+        $this->write($messages, $newline, $verbosity);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function writeErrorRaw($messages, $newline = true, $verbosity = self::NORMAL)
+    {
+        $this->writeError($messages, $newline, $verbosity);
+    }
+
     /**
      * Check for overwrite and set the authentication information for the repository.
      *

src/Composer/IO/ConsoleIO.php

@@ -129,13 +129,29 @@ class ConsoleIO extends BaseIO
         $this->doWrite($messages, $newline, true, $verbosity);
     }
 
+    /**
+     * {@inheritDoc}
+     */
+    public function writeRaw($messages, $newline = true, $verbosity = self::NORMAL)
+    {
+        $this->doWrite($messages, $newline, false, $verbosity, true);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function writeErrorRaw($messages, $newline = true, $verbosity = self::NORMAL)
+    {
+        $this->doWrite($messages, $newline, true, $verbosity, true);
+    }
+
     /**
      * @param array|string $messages
      * @param bool         $newline
      * @param bool         $stderr
      * @param int          $verbosity
      */
-    private function doWrite($messages, $newline, $stderr, $verbosity)
+    private function doWrite($messages, $newline, $stderr, $verbosity, $raw = false)
     {
         $sfVerbosity = $this->verbosityMap[$verbosity];
         if ($sfVerbosity > $this->output->getVerbosity()) {
@@ -149,6 +165,14 @@ class ConsoleIO extends BaseIO
             $sfVerbosity = OutputInterface::OUTPUT_NORMAL;
         }
 
+        if ($raw) {
+            if ($sfVerbosity === OutputInterface::OUTPUT_NORMAL) {
+                $sfVerbosity = OutputInterface::OUTPUT_RAW;
+            } else {
+                $sfVerbosity |= OutputInterface::OUTPUT_RAW;
+            }
+        }
+
         if (null !== $this->startTime) {
             $memoryUsage = memory_get_usage() / 1024 / 1024;
             $timeSpent = microtime(true) - $this->startTime;

src/Composer/Util/ProcessExecutor.php

@@ -112,10 +112,18 @@ class ProcessExecutor
             return;
         }
 
-        if (Process::ERR === $type) {
-            $this->io->writeError($buffer, false);
+        if (method_exists($this->io, 'writeRaw')) {
+            if (Process::ERR === $type) {
+                $this->io->writeErrorRaw($buffer, false);
+            } else {
+                $this->io->writeRaw($buffer, false);
+            }
         } else {
-            $this->io->write($buffer, false);
+            if (Process::ERR === $type) {
+                $this->io->writeError($buffer, false);
+            } else {
+                $this->io->write($buffer, false);
+            }
         }
     }
 

tests/Composer/Test/Util/ProcessExecutorTest.php

@@ -111,6 +111,6 @@ class ProcessExecutorTest extends TestCase
         $process = new ProcessExecutor(new ConsoleIO(new ArrayInput([]), $output, new HelperSet([])));
 
         $process->execute('echo \'<error>foo</error>\'');
-        $this->assertSame('<error>foo</error>', $output->fetch());
+        $this->assertSame('<error>foo</error>'.PHP_EOL, $output->fetch());
     }
 }