resolve rector verison in own command

.github/workflows/build_scoped_rector.yaml

@@ -48,6 +48,9 @@ jobs:
             # install only prod dependencies - do not use ramsey, it uses cache including "dev", we want to avoid it here
             -   run: composer install --no-dev --ansi
 
+            # resolve rector version
+            -   run: bin/resolve-version.php
+
             # early downgrade individual functions
             -   run: bin/rector process src/functions -c build/config/config-downgrade.php --ansi
 

bin/resolve-version.php

@@ -0,0 +1,56 @@
+<?php
+
+declare(strict_types=1);
+
+// resolve git version stored in released rector
+// tag for tagged one, hash for dev
+
+/**
+ * Inspired by https://github.com/composer/composer/blob/master/src/Composer/Composer.php
+ * See https://github.com/composer/composer/blob/6587715d0f8cae0cd39073b3bc5f018d0e6b84fe/src/Composer/Compiler.php#L208
+ *
+ * @see \Rector\Core\Tests\Application\VersionResolverTest
+ */
+final class VersionResolver
+{
+    /**
+     * @var int
+     */
+    private const SUCCESS_CODE = 0;
+
+    public function resolve(): string
+    {
+        // resolve current tag
+        exec('git tag --points-at', $tagExecOutput, $tagExecResultCode);
+
+        if ($tagExecResultCode !== self::SUCCESS_CODE) {
+            die('Ensure to run compile from composer git repository clone and that git binary is available.');
+        }
+
+        // debug output
+        var_dump($tagExecOutput);
+
+        if ($tagExecOutput !== []) {
+            $tag = $tagExecOutput[0];
+            if ($tag !== '') {
+                return $tag;
+            }
+        }
+
+        exec('git log --pretty="%H" -n1 HEAD', $commitHashExecOutput, $commitHashResultCode);
+
+        if ($commitHashResultCode !== 0) {
+            die('Ensure to run compile from composer git repository clone and that git binary is available.');
+        }
+
+        // debug output
+        var_dump($commitHashExecOutput);
+
+        $version = trim($commitHashExecOutput[0]);
+        return trim($version, '"');
+    }
+}
+
+
+$versionResolver = new VersionResolver();
+echo $versionResolver->resolve() . PHP_EOL;