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- // Copyright (c) 2012 The Chromium Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style license that can be
- // found in the LICENSE file.
- #include "base/test/test_file_util.h"
- #include <errno.h>
- #include <fcntl.h>
- #include <stddef.h>
- #include <sys/types.h>
- #include <unistd.h>
- #include <string>
- #include "base/check_op.h"
- #include "base/files/file.h"
- #include "base/files/file_util.h"
- #include "base/notreached.h"
- #include "base/strings/string_util.h"
- #include "base/strings/utf_string_conversions.h"
- #include "build/build_config.h"
- namespace base {
- namespace {
- // Deny |permission| on the file |path|.
- bool DenyFilePermission(const FilePath& path, mode_t permission) {
- stat_wrapper_t stat_buf;
- if (File::Stat(path.value().c_str(), &stat_buf) != 0)
- return false;
- stat_buf.st_mode &= ~permission;
- int rv = HANDLE_EINTR(chmod(path.value().c_str(), stat_buf.st_mode));
- return rv == 0;
- }
- // Gets a blob indicating the permission information for |path|.
- // |length| is the length of the blob. Zero on failure.
- // Returns the blob pointer, or NULL on failure.
- void* GetPermissionInfo(const FilePath& path, size_t* length) {
- DCHECK(length);
- *length = 0;
- stat_wrapper_t stat_buf;
- if (File::Stat(path.value().c_str(), &stat_buf) != 0)
- return nullptr;
- *length = sizeof(mode_t);
- mode_t* mode = new mode_t;
- *mode = stat_buf.st_mode & ~S_IFMT; // Filter out file/path kind.
- return mode;
- }
- // Restores the permission information for |path|, given the blob retrieved
- // using |GetPermissionInfo()|.
- // |info| is the pointer to the blob.
- // |length| is the length of the blob.
- // Either |info| or |length| may be NULL/0, in which case nothing happens.
- bool RestorePermissionInfo(const FilePath& path, void* info, size_t length) {
- if (!info || (length == 0))
- return false;
- DCHECK_EQ(sizeof(mode_t), length);
- mode_t* mode = reinterpret_cast<mode_t*>(info);
- int rv = HANDLE_EINTR(chmod(path.value().c_str(), *mode));
- delete mode;
- return rv == 0;
- }
- } // namespace
- bool DieFileDie(const FilePath& file, bool recurse) {
- // There is no need to workaround Windows problems on POSIX.
- // Just pass-through.
- if (recurse)
- return DeletePathRecursively(file);
- return DeleteFile(file);
- }
- void SyncPageCacheToDisk() {
- // On Linux (and Android) the sync(2) call waits for I/O completions.
- sync();
- }
- #if !BUILDFLAG(IS_LINUX) && !BUILDFLAG(IS_CHROMEOS) && !BUILDFLAG(IS_APPLE) && \
- !BUILDFLAG(IS_ANDROID)
- bool EvictFileFromSystemCache(const FilePath& file) {
- // There doesn't seem to be a POSIX way to cool the disk cache.
- NOTIMPLEMENTED();
- return false;
- }
- #endif
- bool MakeFileUnreadable(const FilePath& path) {
- return DenyFilePermission(path, S_IRUSR | S_IRGRP | S_IROTH);
- }
- bool MakeFileUnwritable(const FilePath& path) {
- return DenyFilePermission(path, S_IWUSR | S_IWGRP | S_IWOTH);
- }
- FilePermissionRestorer::FilePermissionRestorer(const FilePath& path)
- : path_(path), info_(nullptr), length_(0) {
- info_ = GetPermissionInfo(path_, &length_);
- DCHECK(info_ != nullptr);
- DCHECK_NE(0u, length_);
- }
- FilePermissionRestorer::~FilePermissionRestorer() {
- if (!RestorePermissionInfo(path_, info_, length_))
- NOTREACHED();
- }
- } // namespace base
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