From 9b7a8d4543d1b8d9df818f996dc8316963224ded Mon Sep 17 00:00:00 2001
From: Jordi Boggiano <j.boggiano@seld.be>
Date: Mon, 3 May 2021 14:41:48 +0200
Subject: [PATCH] Hint at a branch rename if we detect dev-master can not be
 found but dev-main or dev-default exists, fixes #9850

---
 src/Composer/DependencyResolver/Problem.php   | 12 +++-
 .../Fixtures/installer/hint-main-rename.test  | 64 +++++++++++++++++++
 2 files changed, 75 insertions(+), 1 deletion(-)
 create mode 100644 tests/Composer/Test/Fixtures/installer/hint-main-rename.test

diff --git a/src/Composer/DependencyResolver/Problem.php b/src/Composer/DependencyResolver/Problem.php
index c090a34d8..996cd5005 100644
--- a/src/Composer/DependencyResolver/Problem.php
+++ b/src/Composer/DependencyResolver/Problem.php
@@ -291,7 +291,17 @@ class Problem
                 return self::computeCheckForLowerPrioRepo($isVerbose, $packageName, $constraint, $packages, $allReposPackages, 'constraint');
             }
 
-            return array("- Root composer.json requires $packageName".self::constraintToText($constraint) . ', ', 'found '.self::getPackageList($packages, $isVerbose).' but '.(self::hasMultipleNames($packages) ? 'these do' : 'it does').' not match the constraint.');
+            $suffix = '';
+            if ($constraint instanceof Constraint && $constraint->getVersion() === 'dev-master') {
+                foreach ($packages as $candidate) {
+                    if (in_array($candidate->getVersion(), array('dev-default', 'dev-main'), true)) {
+                        $suffix = ' Perhaps dev-master was renamed to '.$candidate->getPrettyVersion().'?';
+                        break;
+                    }
+                }
+            }
+
+            return array("- Root composer.json requires $packageName".self::constraintToText($constraint) . ', ', 'found '.self::getPackageList($packages, $isVerbose).' but '.(self::hasMultipleNames($packages) ? 'these do' : 'it does').' not match the constraint.' . $suffix);
         }
 
         if (!preg_match('{^[A-Za-z0-9_./-]+$}', $packageName)) {
diff --git a/tests/Composer/Test/Fixtures/installer/hint-main-rename.test b/tests/Composer/Test/Fixtures/installer/hint-main-rename.test
new file mode 100644
index 000000000..bd28a278a
--- /dev/null
+++ b/tests/Composer/Test/Fixtures/installer/hint-main-rename.test
@@ -0,0 +1,64 @@
+--TEST--
+Test that master branches renamed to main is hinted to the user. This also covers minification of dev-x branches in output.
+--COMPOSER--
+{
+    "repositories": [
+        {
+            "type": "package",
+            "package": [
+                { "name": "package/a", "version": "2.0.0" },
+                { "name": "package/a", "version": "2.0.1" },
+                { "name": "package/a", "version": "2.0.2" },
+                { "name": "package/a", "version": "2.0.3" },
+                { "name": "package/a", "version": "2.1.0" },
+                { "name": "package/a", "version": "2.2.0" },
+                { "name": "package/a", "version": "2.3.1" },
+                { "name": "package/a", "version": "2.3.2" },
+                { "name": "package/a", "version": "2.3.3" },
+                { "name": "package/a", "version": "2.3.4" },
+                { "name": "package/a", "version": "2.3.5" },
+                { "name": "package/a", "version": "2.4.0" },
+                { "name": "package/a", "version": "2.5.0" },
+                { "name": "package/a", "version": "2.6.0" },
+                { "name": "package/a", "version": "dev-main" },
+                { "name": "package/a", "version": "dev-foo-1" },
+                { "name": "package/a", "version": "dev-foo-2" },
+                { "name": "package/a", "version": "dev-foo-3" },
+                { "name": "package/a", "version": "dev-foo-4" },
+                { "name": "package/a", "version": "dev-foo-5" },
+                { "name": "package/a", "version": "dev-foo-6" },
+                { "name": "package/a", "version": "dev-foo-7" },
+                { "name": "package/a", "version": "dev-foo-8" },
+                { "name": "package/a", "version": "dev-foo-9" },
+                { "name": "package/a", "version": "dev-foo-10" },
+                { "name": "package/a", "version": "dev-foo-11" },
+                { "name": "package/a", "version": "dev-foo-12" },
+                { "name": "package/a", "version": "dev-foo-13" },
+                { "name": "package/a", "version": "dev-foo-14" },
+                { "name": "package/a", "version": "dev-foo-15" },
+                { "name": "package/a", "version": "dev-foo-16" },
+                { "name": "package/a", "version": "dev-foo-17" },
+                { "name": "package/a", "version": "dev-foo-18" }
+            ]
+        }
+    ],
+    "require": {
+        "package/a": "dev-master"
+    }
+}
+
+--RUN--
+update
+
+--EXPECT-EXIT-CODE--
+2
+
+--EXPECT-OUTPUT--
+Loading composer repositories with package information
+Updating dependencies
+Your requirements could not be resolved to an installable set of packages.
+
+  Problem 1
+    - Root composer.json requires package/a dev-master, found package/a[dev-main, ..., dev-foo-18, 2.0.0, ..., 2.6.0] but it does not match the constraint. Perhaps dev-master was renamed to dev-main?
+
+--EXPECT--