// Copyright (c) 2012 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 "base/test/test_file_util.h"
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#include <errno.h>
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#include <fcntl.h>
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#include <stddef.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <string>
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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/logging.h"
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#include "base/strings/string_util.h"
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#include "base/strings/utf_string_conversions.h"
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#include "build/build_config.h"
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namespace base {
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namespace {
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// Deny |permission| on the file |path|.
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bool DenyFilePermission(const FilePath& path, mode_t permission) {
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struct stat stat_buf;
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if (stat(path.value().c_str(), &stat_buf) != 0)
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return false;
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stat_buf.st_mode &= ~permission;
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int rv = HANDLE_EINTR(chmod(path.value().c_str(), stat_buf.st_mode));
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return rv == 0;
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}
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// Gets a blob indicating the permission information for |path|.
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// |length| is the length of the blob. Zero on failure.
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// Returns the blob pointer, or NULL on failure.
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void* GetPermissionInfo(const FilePath& path, size_t* length) {
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DCHECK(length);
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*length = 0;
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struct stat stat_buf;
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if (stat(path.value().c_str(), &stat_buf) != 0)
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return nullptr;
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*length = sizeof(mode_t);
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mode_t* mode = new mode_t;
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*mode = stat_buf.st_mode & ~S_IFMT; // Filter out file/path kind.
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return mode;
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}
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// Restores the permission information for |path|, given the blob retrieved
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// using |GetPermissionInfo()|.
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// |info| is the pointer to the blob.
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// |length| is the length of the blob.
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// Either |info| or |length| may be NULL/0, in which case nothing happens.
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bool RestorePermissionInfo(const FilePath& path, void* info, size_t length) {
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if (!info || (length == 0))
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return false;
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DCHECK_EQ(sizeof(mode_t), length);
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mode_t* mode = reinterpret_cast<mode_t*>(info);
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int rv = HANDLE_EINTR(chmod(path.value().c_str(), *mode));
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delete mode;
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return rv == 0;
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}
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} // namespace
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bool DieFileDie(const FilePath& file, bool recurse) {
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// There is no need to workaround Windows problems on POSIX.
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// Just pass-through.
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return DeleteFile(file, recurse);
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}
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#if !defined(OS_LINUX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
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bool EvictFileFromSystemCache(const FilePath& file) {
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// There doesn't seem to be a POSIX way to cool the disk cache.
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NOTIMPLEMENTED();
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return false;
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}
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#endif
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bool MakeFileUnreadable(const FilePath& path) {
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return DenyFilePermission(path, S_IRUSR | S_IRGRP | S_IROTH);
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}
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bool MakeFileUnwritable(const FilePath& path) {
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return DenyFilePermission(path, S_IWUSR | S_IWGRP | S_IWOTH);
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}
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FilePermissionRestorer::FilePermissionRestorer(const FilePath& path)
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: path_(path), info_(nullptr), length_(0) {
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info_ = GetPermissionInfo(path_, &length_);
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DCHECK(info_ != nullptr);
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DCHECK_NE(0u, length_);
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}
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FilePermissionRestorer::~FilePermissionRestorer() {
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if (!RestorePermissionInfo(path_, info_, length_))
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NOTREACHED();
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}
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} // namespace base
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