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When ignoreLockingMode option is used, we default to the unix-none or win32-none VFS, and enforce the connection to be read-only, because it's trivial to corrupt data using a no-lock VFS. Unfortunately read-only mode doesn't allow to open a WAL database if the journal files are missing, unless the device is marked as "immutable". There is no SQLITE_OPEN_* flag for immutable, and adding one could easily be misinterpreted since it only makes sense for read-only. This implement a readonly-immutable-nolock VFS shim on top of unix-none or win32-none that overrides device characteristics with immutable. When ignoreLockingMode option is specified, we use this VFS. It can only be used on read-only connections, as enforced both by Storage service and a MOZ_ASSERT. Differential Revision: https://phabricator.services.mozilla.com/D162492
48 lines
1.8 KiB
JavaScript
48 lines
1.8 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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// This file tests the readonly-immutable-nolock VFS.
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add_task(async function test() {
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const path = PathUtils.join(PathUtils.profileDir, "ro");
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await IOUtils.makeDirectory(path);
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const dbpath = PathUtils.join(path, "test-immutable.sqlite");
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let conn = await Sqlite.openConnection({ path: dbpath });
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await conn.execute("PRAGMA journal_mode = WAL");
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await conn.execute("CREATE TABLE test (id INTEGER PRIMARY KEY)");
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Assert.ok(await IOUtils.exists(dbpath + "-wal"), "wal journal exists");
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await conn.close();
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// The wal should have been merged at this point, but just in case...
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info("Remove auxiliary files and set the folder as readonly");
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await IOUtils.remove(dbpath + "-wal", { ignoreAbsent: true });
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await IOUtils.setPermissions(path, 0o555);
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registerCleanupFunction(async () => {
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await IOUtils.setPermissions(path, 0o777);
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await IOUtils.remove(path, { recursive: true });
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});
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// Windows doesn't disallow creating files in read only folders.
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if (AppConstants.platform == "macosx" || AppConstants.platform == "linux") {
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await Assert.rejects(
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Sqlite.openConnection({ path: dbpath, readOnly: true }),
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/NS_ERROR_FILE/,
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"Should not be able to open the db because it can't create a wal journal"
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);
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}
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// Open the database with ignoreLockingMode.
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let conn2 = await Sqlite.openConnection({
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path: dbpath,
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ignoreLockingMode: true,
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});
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await conn2.execute("SELECT * FROM sqlite_master");
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Assert.ok(
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!(await IOUtils.exists(dbpath + "-wal")),
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"wal journal was not created"
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);
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await conn2.close();
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});
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