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64 lines
2.6 KiB
C++
64 lines
2.6 KiB
C++
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// Copyright 2018 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include <sys/stat.h>
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#include <time.h>
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#include <utime.h>
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#include <string>
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#include "base/base_paths.h"
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#include "base/files/file_path.h"
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#include "base/files/file_util.h"
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#include "base/path_service.h"
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#include "base/strings/strcat.h"
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#include "base/test/fontconfig_util_linux.h"
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// GIANT WARNING: The point of this file is to front-load construction of the
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// font cache [which takes 600ms] from test run time to compile time. This saves
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// 600ms on each test shard which uses the font cache into compile time. The
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// problem is that fontconfig cache construction is not intended to be
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// deterministic. This executable tries to set some external state to ensure
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// determinism. We have no way of guaranteeing that this produces correct
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// results, or even has the intended effect.
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int main() {
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// fontconfig generates a random uuid and uses it to match font folders with
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// the font cache. Rather than letting fontconfig generate a random uuid,
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// which introduces build non-determinism, we place a fixed uuid in the font
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// folder, which fontconfig will use to generate the cache.
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base::FilePath dir_module;
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base::PathService::Get(base::DIR_MODULE, &dir_module);
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base::FilePath uuid_file_path =
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dir_module.Append("test_fonts").Append(".uuid");
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const char uuid[] = "df1acc8c-39d5-4a8b-8507-b1a7396ac3ac";
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WriteFile(uuid_file_path, uuid, strlen(uuid));
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// fontconfig writes the mtime of the test_fonts directory into the cache. It
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// presumably checks this later to ensure that the cache is still up to date.
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// We set the mtime to an arbitrary, fixed time in the past.
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base::FilePath test_fonts_file_path = dir_module.Append("test_fonts");
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struct stat old_times;
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struct utimbuf new_times;
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stat(test_fonts_file_path.value().c_str(), &old_times);
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new_times.actime = old_times.st_atime;
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// Use an arbitrary, fixed time.
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new_times.modtime = 123456789;
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utime(test_fonts_file_path.value().c_str(), &new_times);
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base::FilePath fontconfig_caches = dir_module.Append("fontconfig_caches");
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// Delete directory before generating fontconfig caches. This will notify
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// future fontconfig_caches changes.
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CHECK(base::DeleteFile(fontconfig_caches, /*recursive=*/true));
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base::SetUpFontconfig();
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base::TearDownFontconfig();
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// Check existence of intended fontconfig cache file.
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CHECK(base::PathExists(
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fontconfig_caches.Append(base::StrCat({uuid, "-le64.cache-7"}))));
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return 0;
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}
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