mongodb/jstests/noPassthrough/directoryperdb.js

/**
 * Tests that a mongod started with --directoryperdb will write data for database x into a directory
 * named x inside the dbpath.
 *
 * This test does not make sense for in-memory storage engines, since they will not produce any data
 * files.
 * @tags: [requires_persistence]
 */

(function() {
'use strict';

var baseDir = "jstests_directoryperdb";
var dbpath = MongoRunner.dataPath + baseDir + "/";

var isDirectoryPerDBSupported =
    jsTest.options().storageEngine == "wiredTiger" || !jsTest.options().storageEngine;

var m = MongoRunner.runMongod({dbpath: dbpath, directoryperdb: ''});

if (!isDirectoryPerDBSupported) {
    assert.isnull(m, 'storage engine without directoryperdb support should fail to start up');
    return;
} else {
    assert(m, 'storage engine with directoryperdb support failed to start up');
}

var db = m.getDB("foo");
db.bar.insert({x: 1});
assert.eq(1, db.bar.count());

db.adminCommand({fsync: 1});
var dbpathFiles = listFiles(dbpath);
var files = dbpathFiles.filter(function(z) {
    return z.name.endsWith("/foo");
});
assert.eq(1, files.length, 'dbpath does not contain "foo" directory: ' + tojson(dbpathFiles));

files = listFiles(files[0].name);
assert(files.length > 0);

MongoRunner.stopMongod(m);

// Subsequent attempt to start server using same dbpath without directoryperdb should fail.
assert.isnull(MongoRunner.runMongod({dbpath: dbpath, restart: true}));
}());