Allow disabling execution of operations and lock writing independently from dryRun, closes #5787

src/Composer/Installer.php

@@ -115,6 +115,9 @@ class Installer
     protected $preferStable = false;
     protected $preferLowest = false;
     protected $skipSuggest = false;
+    protected $writeLock = true;
+    protected $executeOperations = true;
+
     /**
      * Array of package names/globs flagged for update
      *
@@ -182,6 +185,9 @@ class Installer
         if ($this->dryRun) {
             $this->verbose = true;
             $this->runScripts = false;
+            $this->executeOperations = false;
+            $this->writeLock = false;
+            $this->dumpAutoloader = false;
             $this->installationManager->addInstaller(new NoopInstaller);
             $this->mockLocalRepositories($this->repositoryManager);
         }
@@ -218,13 +224,13 @@ class Installer
                 return $res;
             }
         } catch (\Exception $e) {
-            if (!$this->dryRun) {
+            if ($this->executeOperations) {
                 $this->installationManager->notifyInstalls($this->io);
             }
 
             throw $e;
         }
-        if (!$this->dryRun) {
+        if ($this->executeOperations) {
             $this->installationManager->notifyInstalls($this->io);
         }
 
@@ -252,9 +258,8 @@ class Installer
             );
         }
 
-        if (!$this->dryRun) {
         // write lock
-            if ($this->update) {
+        if ($this->update && $this->writeLock) {
             $localRepo->reload();
 
             $platformReqs = $this->extractPlatformRequirements($this->package->getRequires());
@@ -300,6 +305,7 @@ class Installer
             $this->eventDispatcher->dispatchScript($eventName, $this->devMode);
         }
 
+        if ($this->executeOperations) {
             // force binaries re-generation in case they are missing
             foreach ($localRepo->getPackages() as $package) {
                 $this->installationManager->ensureBinariesPresence($package);
@@ -566,8 +572,8 @@ class Installer
                 $this->eventDispatcher->dispatchPackageEvent(constant($event), $this->devMode, $policy, $pool, $installedRepo, $request, $operations, $operation);
             }
 
-            // output non-alias ops in dry run, output alias ops in debug verbosity
+            // output non-alias ops when not executing operations (i.e. dry run), output alias ops in debug verbosity
-            if ($this->dryRun && false === strpos($operation->getJobType(), 'Alias')) {
+            if (!$this->executeOperations && false === strpos($operation->getJobType(), 'Alias')) {
                 $this->io->writeError('  - ' . $operation);
                 $this->io->writeError('');
             } elseif ($this->io->isDebug() && false !== strpos($operation->getJobType(), 'Alias')) {
@@ -599,12 +605,12 @@ class Installer
                 $this->eventDispatcher->dispatchPackageEvent(constant($event), $this->devMode, $policy, $pool, $installedRepo, $request, $operations, $operation);
             }
 
-            if (!$this->dryRun) {
+            if ($this->executeOperations) {
                 $localRepo->write();
             }
         }
 
-        if (!$this->dryRun) {
+        if ($this->executeOperations) {
             // force source/dist urls to be updated for all packages
             $this->processPackageUrls($pool, $policy, $localRepo, $repositories);
             $localRepo->write();
@@ -1521,6 +1527,8 @@ class Installer
     /**
      * set whether to run autoloader or not
      *
+     * This is disabled implicitly when enabling dryRun
+     *
      * @param  bool      $dumpAutoloader
      * @return Installer
      */
@@ -1534,6 +1542,8 @@ class Installer
     /**
      * set whether to run scripts or not
      *
+     * This is disabled implicitly when enabling dryRun
+     *
      * @param  bool      $runScripts
      * @return Installer
      */
@@ -1646,6 +1656,36 @@ class Installer
         return $this;
     }
 
+    /**
+     * Should the lock file be updated when updating?
+     *
+     * This is disabled implicitly when enabling dryRun
+     *
+     * @param  bool      $writeLock
+     * @return Installer
+     */
+    public function setWriteLock($writeLock = true)
+    {
+        $this->writeLock = (boolean) $writeLock;
+
+        return $this;
+    }
+
+    /**
+     * Should the operations (packge install, update and removal) be executed on disk?
+     *
+     * This is disabled implicitly when enabling dryRun
+     *
+     * @param  bool      $executeOperations
+     * @return Installer
+     */
+    public function setExecuteOperations($executeOperations = true)
+    {
+        $this->executeOperations = (boolean) $executeOperations;
+
+        return $this;
+    }
+
     /**
      * Should suggestions be skipped?
      *