From a03331bd219223ce15ddcaae480370d1163ec538 Mon Sep 17 00:00:00 2001
From: Jordi Boggiano <j.boggiano@seld.be>
Date: Thu, 19 Sep 2024 11:40:57 +0200
Subject: [PATCH] Add --strict-ambiguous to dump-autoload command (#12119)

Fixes #6221
---
 doc/03-cli.md                                | 2 ++
 src/Composer/Command/DumpAutoloadCommand.php | 8 ++++++++
 2 files changed, 10 insertions(+)

diff --git a/doc/03-cli.md b/doc/03-cli.md
index 8c1c56e16..c99624db3 100644
--- a/doc/03-cli.md
+++ b/doc/03-cli.md
@@ -990,6 +990,8 @@ performance.
   Multiple requirements can be ignored via wildcard.
 * **--strict-psr:** Return a failed exit code (1) if PSR-4 or PSR-0 mapping errors
   are present. Requires --optimize to work.
+* **--strict-ambiguous:** Return a failed exit code (2) if the same class is found
+  in multiple files. Requires --optimize to work.
 
 ## clear-cache / clearcache / cc
 
diff --git a/src/Composer/Command/DumpAutoloadCommand.php b/src/Composer/Command/DumpAutoloadCommand.php
index c30fae7a8..6e6b56a5a 100644
--- a/src/Composer/Command/DumpAutoloadCommand.php
+++ b/src/Composer/Command/DumpAutoloadCommand.php
@@ -43,6 +43,7 @@ class DumpAutoloadCommand extends BaseCommand
                 new InputOption('ignore-platform-req', null, InputOption::VALUE_REQUIRED | InputOption::VALUE_IS_ARRAY, 'Ignore a specific platform requirement (php & ext- packages).'),
                 new InputOption('ignore-platform-reqs', null, InputOption::VALUE_NONE, 'Ignore all platform requirements (php & ext- packages).'),
                 new InputOption('strict-psr', null, InputOption::VALUE_NONE, 'Return a failed status code (1) if PSR-4 or PSR-0 mapping errors are present. Requires --optimize to work.'),
+                new InputOption('strict-ambiguous', null, InputOption::VALUE_NONE, 'Return a failed status code (2) if the same class is found in multiple files. Requires --optimize to work.'),
             ])
             ->setHelp(
                 <<<EOT
@@ -74,6 +75,9 @@ EOT
         if ($input->getOption('strict-psr') && !$optimize && !$authoritative) {
             throw new \InvalidArgumentException('--strict-psr mode only works with optimized autoloader, use --optimize or --classmap-authoritative if you want a strict return value.');
         }
+        if ($input->getOption('strict-ambiguous') && !$optimize && !$authoritative) {
+            throw new \InvalidArgumentException('--strict-ambiguous mode only works with optimized autoloader, use --optimize or --classmap-authoritative if you want a strict return value.');
+        }
 
         if ($authoritative) {
             $this->getIO()->write('<info>Generating optimized autoload files (authoritative)</info>');
@@ -124,6 +128,10 @@ EOT
             return 1;
         }
 
+        if ($input->getOption('strict-ambiguous') && count($classMap->getAmbiguousClasses()) > 0) {
+            return 2;
+        }
+
         return 0;
     }
 }