From acdb7638a83ca1d6f5c1e0b9389a26c423f53ef5 Mon Sep 17 00:00:00 2001
From: Jordi Boggiano <j.boggiano@seld.be>
Date: Mon, 7 Aug 2017 16:32:04 +0200
Subject: [PATCH] Warn about require-dev not being ignored when an update
 --no-dev fails to resolve dependencies, fixes #6575

---
 src/Composer/Installer.php | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/Composer/Installer.php b/src/Composer/Installer.php
index 5d70832b2..ca7deb3ac 100644
--- a/src/Composer/Installer.php
+++ b/src/Composer/Installer.php
@@ -473,6 +473,9 @@ class Installer
         } catch (SolverProblemsException $e) {
             $this->io->writeError('<error>Your requirements could not be resolved to an installable set of packages.</error>', true, IOInterface::QUIET);
             $this->io->writeError($e->getMessage());
+            if ($this->update && !$this->devMode) {
+                $this->io->writeError('<warning>Running update with --no-dev does not mean require-dev is ignored, it just means the packages will not be installed. If dev requirements are blocking the update you have to resolve those problems.</warning>', true, IOInterface::QUIET);
+            }
 
             return array(max(1, $e->getCode()), array());
         }