Filter impossible packages from the pool (#9620)

Adds a new pass to the PoolOptimizer

Co-authored-by: Jordi Boggiano <j.boggiano@seld.be>

src/Composer/DependencyResolver/PoolOptimizer.php

@@ -75,7 +75,11 @@ class PoolOptimizer
     {
         $this->prepare($request, $pool);
 
-        $optimizedPool = $this->optimizeByIdenticalDependencies($pool);
+        $this->optimizeByIdenticalDependencies($request, $pool);
+
+        $this->optimizeImpossiblePackagesAway($request, $pool);
+
+        $optimizedPool = $this->applyRemovalsToPool($pool);
 
         // No need to run this recursively at the moment
         // because the current optimizations cannot provide
@@ -183,16 +187,13 @@ class PoolOptimizer
 
         $optimizedPool = new Pool($packages, $pool->getUnacceptableFixedOrLockedPackages(), $removedVersions, $this->removedVersionsByPackage);
 
-        // Reset package removals
-        $this->packagesToRemove = array();
-
         return $optimizedPool;
     }
 
     /**
-     * @return Pool
+     * @return void
      */
-    private function optimizeByIdenticalDependencies(Pool $pool)
+    private function optimizeByIdenticalDependencies(Request $request, Pool $pool)
     {
         $identicalDefinitionsPerPackage = array();
         $packageIdenticalDefinitionLookup = array();
@@ -273,8 +274,6 @@ class PoolOptimizer
                 }
             }
         }
-
-        return $this->applyRemovalsToPool($pool);
     }
 
     /**
@@ -383,4 +382,56 @@ class PoolOptimizer
             }
         }
     }
+
+    /**
+     * Use the list of locked packages to constrain the loaded packages
+     * This will reduce packages with significant numbers of historical versions to a smaller number
+     * and reduce the resulting rule set that is generated
+     *
+     * @return void
+     */
+    private function optimizeImpossiblePackagesAway(Request $request, Pool $pool)
+    {
+        if (count($request->getLockedPackages()) === 0) {
+            return;
+        }
+
+        $packageIndex = array();
+
+        foreach ($pool->getPackages() as $package) {
+            $id = $package->id;
+
+            // Do not remove irremovable packages
+            if (isset($this->irremovablePackages[$id])) {
+                continue;
+            }
+            // Do not remove a package aliased by another package, nor aliases
+            if (isset($this->aliasesPerPackage[$id]) || $package instanceof AliasPackage) {
+                continue;
+            }
+            // Do not remove locked packages
+            if ($request->isFixedPackage($package) || $request->isLockedPackage($package)) {
+                continue;
+            }
+
+            $packageIndex[$package->getName()][$package->id] = $package;
+        }
+
+        foreach ($request->getLockedPackages() as $package) {
+            foreach ($package->getRequires() as $link) {
+                $require = $link->getTarget();
+                if (!isset($packageIndex[$require])) {
+                    continue;
+                }
+
+                $linkConstraint = $link->getConstraint();
+                foreach ($packageIndex[$require] as $id => $requiredPkg) {
+                    if (false === CompilingMatcher::match($linkConstraint, Constraint::OP_EQ, $requiredPkg->getVersion())) {
+                        $this->markPackageForRemoval($id);
+                        unset($packageIndex[$require][$id]);
+                    }
+                }
+            }
+        }
+    }
 }

tests/Composer/Test/DependencyResolver/Fixtures/poolbuilder/filter-impossible-packages.test

@@ -0,0 +1,54 @@
+--TEST--
+Do not load packages into the pool that cannot meet the fixed/locked requirements, when a loose requirement is encountered during update
+
+--REQUEST--
+{
+    "require": {
+        "some/pkg": "*",
+        "root/req": "*"
+    },
+    "locked": [
+        {"name": "some/pkg", "version": "1.0.3", "require": {"dep/dep": "*"}, "id": 1},
+        {"name": "root/req", "version": "1.0.0", "require": {"dep/dep": "2.*"}, "id": 2},
+        {"name": "dep/dep", "version": "2.0.0", "id": 3}
+    ],
+    "allowList": [
+        "some/pkg"
+    ],
+    "allowTransitiveDeps": true
+}
+
+--FIXED--
+[
+]
+
+--PACKAGE-REPOS--
+[
+    [
+        {"name": "some/pkg", "version": "1.0.4", "require": {"dep/dep": "*"}},
+        {"name": "root/req", "version": "1.0.0", "require": {"dep/dep": "2.*"}},
+        {"name": "dep/dep", "version": "1.0.0", "provide": {"other/pkg": "*"}},
+        {"name": "dep/dep", "version": "1.0.1", "provide": {"other/pkg": "*"}},
+        {"name": "dep/dep", "version": "1.0.2", "provide": {"other/pkg": "*"}},
+        {"name": "dep/dep", "version": "2.0.0"},
+        {"name": "dep/dep", "version": "2.0.1"}
+    ]
+]
+
+--EXPECT--
+[
+    2,
+    "some/pkg-1.0.4.0",
+    "dep/dep-1.0.0.0",
+    "dep/dep-1.0.1.0",
+    "dep/dep-1.0.2.0",
+    "dep/dep-2.0.0.0",
+    "dep/dep-2.0.1.0"
+]
+
+--EXPECT-OPTIMIZED--
+[
+    2,
+    "some/pkg-1.0.4.0",
+    "dep/dep-2.0.1.0"
+]

tests/Composer/Test/DependencyResolver/Fixtures/poolbuilder/partial-update-unfixes-path-repos-always-but-not-their-transitive-deps.test

@@ -86,6 +86,5 @@ Partially updating one root requirement with transitive deps fully updates trans
    "symlinked/path-pkg-2.0.0.0",
    "root/update-1.0.4.0",
    "symlinked/transitive2-2.0.4.0",
-   "mirrored/transitive2-1.0.7.0",
-   "mirrored/transitive2-2.0.8.0"
+   "mirrored/transitive2-1.0.7.0"
 ]

tests/Composer/Test/DependencyResolver/Fixtures/poolbuilder/partial-update-unfixing-locked-deps.test

@@ -55,6 +55,5 @@ locked packages still need to be taking into account for loading all necessary v
     "root/req2-1.0.0.0 (locked)",
     "dep/pkg2-1.0.0.0",
     "dep/pkg2-1.2.0.0",
-    "dep/pkg1-1.0.1.0",
-    "dep/pkg1-2.0.0.0"
+    "dep/pkg1-1.0.1.0"
 ]