MDL-37783 add some useful information to any phpunit output

lib/phpunit/bootstrap.php

@@ -212,6 +212,8 @@ if (PHPUNIT_UTIL) {
 
 // is database and dataroot ready for testing?
 list($errorcode, $message) = phpunit_util::testing_ready_problem();
+// print some version info
+phpunit_util::bootstrap_moodle_info();
 if ($errorcode) {
     phpunit_bootstrap_error($errorcode, $message);
 }

lib/phpunit/classes/util.php

@@ -235,6 +235,72 @@ class phpunit_util extends testing_util {
         phpunit_util::reset_all_data();
     }
 
+    /**
+     * Print some Moodle related info to console.
+     * @internal
+     * @static
+     * @return void
+     */
+    public static function bootstrap_moodle_info() {
+        global $CFG;
+
+        // All developers have to understand English, do not localise!
+
+        $release = null;
+        require("$CFG->dirroot/version.php");
+
+        echo "Moodle $release, $CFG->dbtype";
+        if ($hash = self::get_git_hash()) {
+            echo ", $hash";
+        }
+        echo "\n";
+    }
+
+    /**
+     * Try to get current git hash of the Moodle in $CFG->dirroot.
+     * @return string null if unknown, sha1 hash if known
+     */
+    public static function get_git_hash() {
+        global $CFG;
+
+        // This is a bit naive, but it should mostly work for all platforms.
+
+        if (!file_exists("$CFG->dirroot/.git/HEAD")) {
+            return null;
+        }
+
+        $ref = file_get_contents("$CFG->dirroot/.git/HEAD");
+        if ($ref === false) {
+            return null;
+        }
+
+        $ref = trim($ref);
+
+        if (strpos($ref, 'ref: ') !== 0) {
+            return null;
+        }
+
+        $ref = substr($ref, 5);
+
+        if (!file_exists("$CFG->dirroot/.git/$ref")) {
+            return null;
+        }
+
+        $hash = file_get_contents("$CFG->dirroot/.git/$ref");
+
+        if ($hash === false) {
+            return null;
+        }
+
+        $hash = trim($hash);
+
+        if (strlen($hash) != 40) {
+            return null;
+        }
+
+        return $hash;
+    }
+
     /**
      * Returns original state of global variable.
      * @static